.Dockerfile

@@ -0,0 +1,38 @@
+# Build Stage
+FROM --platform=$BUILDPLATFORM alpine AS build-env
+
+COPY ./dist /dist
+RUN apk add --no-cache ca-certificates
+
+ARG TARGETPLATFORM
+RUN case $TARGETPLATFORM in \
+        'linux/386') \
+            export FOLDER='default_linux_386_sse2'; \
+            ;; \
+        'linux/amd64') \
+            export FOLDER='default_linux_amd64_v1'; \
+            ;; \
+        'linux/arm/v6') \
+            export FOLDER='default_linux_arm_6'; \
+            ;; \
+        'linux/arm/v7') \
+            export FOLDER='default_linux_arm_7'; \
+            ;; \
+        'linux/arm64') \
+            export FOLDER='default_linux_arm64_v8.0'; \
+            ;; \
+        'linux/riscv64') \
+            export FOLDER='default_linux_riscv64_rva20u64'; \
+            ;; \
+        *) echo >&2 "error: unsupported architecture '$TARGETPLATFORM'"; exit 1 ;; \
+    esac \
+    && mv /dist/$FOLDER /app
+
+
+# Final Stage
+FROM scratch
+COPY --from=build-env /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=build-env /app /app
+WORKDIR /app
+USER 1000
+ENTRYPOINT ["./glider"]

.github/workflows/build.yml

@@ -0,0 +1,103 @@
+name: Build
+on:
+  push:
+    branches:
+      - "dev"
+    tags:
+      - "*"
+  pull_request:
+
+env:
+  APP_NAME: glider
+  DOCKERHUB_REPO: nadoo/glider
+  GHCR_REPO: ghcr.io/nadoo/glider
+  PLATFORMS: linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/riscv64
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set Vars
+        run: |
+          echo "SHA_SHORT=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          check-latest: true
+          go-version-file: "go.mod"
+          cache: true
+
+      - name: Test
+        run: go test -v ./...
+
+      - name: Build
+        uses: goreleaser/goreleaser-action@v6
+        if: "!startsWith(github.ref, 'refs/tags/')"
+        with:
+          args: build --snapshot --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Upload Artifacts
+        uses: actions/upload-artifact@v4
+        if: "!startsWith(github.ref, 'refs/tags/')"
+        with:
+          name: ${{ env.APP_NAME }}-dev-${{ env.SHA_SHORT }}
+          path: |
+            ./dist/default_linux_amd64_v1/${{ env.APP_NAME }}
+            ./dist/default_linux_arm64/${{ env.APP_NAME }}
+            ./dist/default_darwin_arm64/${{ env.APP_NAME }}
+            ./dist/default_windows_amd64_v1/${{ env.APP_NAME }}.exe
+
+      - name: Release
+        uses: goreleaser/goreleaser-action@v6
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker - Set up Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker - Login to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Docker - Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker - Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.DOCKERHUB_REPO }}
+            ${{ env.GHCR_REPO }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+
+      - name: Docker - Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: .Dockerfile
+          platforms: ${{ env.PLATFORMS }}
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}

.github/workflows/stale.yml

@@ -0,0 +1,17 @@
+name: 'Close stale issues'
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: 'This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 5 days.'
+          days-before-stale: 90
+          days-before-close: 5
+          exempt-issue-labels: "bug,enhancement"
+          exempt-pr-labels: "bug,enhancement"
+          

.gitignore

@@ -1,5 +1,6 @@
 # Binaries for programs and plugins
 *.exe
+*.exe~
 *.dll
 *.so
 *.dylib
@@ -14,6 +15,19 @@
 .glide/
 
 # custom
+.idea
+.vscode
+.zed
+.DS_Store
+
+# dev test only
+/dev/
+dev*.go
+
+*_test.go
+
+dist
+
 *.zip
 /*.conf
 /*.rule

.goreleaser.yml

@@ -0,0 +1,96 @@
+version: 2
+
+before:
+  hooks:
+    - go mod tidy
+
+builds:
+  - id: default
+    env:
+      - CGO_ENABLED=0
+    goos:
+      - windows
+      - linux
+      - darwin
+      - freebsd
+    goarch:
+      - 386
+      - amd64
+      - arm
+      - arm64
+      - mips
+      - mipsle
+      - mips64
+      - mips64le
+      - riscv64
+    goamd64:
+      - v1
+      - v3
+    goarm:
+      - 6
+      - 7
+    gomips:
+      - hardfloat
+      - softfloat
+
+archives:
+  - id: default
+    builds:
+      - default
+    wrap_in_directory: true
+    formats: tar.gz
+    format_overrides:
+      - goos: windows
+        formats: zip
+    files:
+      - LICENSE
+      - README.md
+      - config/**/*
+      - systemd/*
+
+snapshot:
+  version_template: '{{ incpatch .Version }}-dev-{{.ShortCommit}}'
+
+checksum:
+  name_template: "{{ .ProjectName }}_{{ .Version }}_checksums.txt"
+
+release:
+  prerelease: true
+  draft: true
+
+nfpms:
+  - id: glider
+    package_name: glider
+    vendor: nadoo
+    homepage: https://github.com/nadoo/glider
+    maintainer: nadoo
+    description: Glider is a forward proxy with multiple protocols support, and also a dns/dhcp server with ipset management features(like dnsmasq).
+    license: GPL-3.0 License
+    formats:
+      # - apk
+      - deb
+      # - rpm
+    dependencies:
+      - libsystemd0
+    bindir: /usr/bin
+    release: 1
+    epoch: 1
+    version_metadata: git
+    section: default
+    priority: extra
+    contents:
+      - src: systemd/glider@.service
+        dst: /etc/systemd/system/glider@.service
+
+      - src: config/glider.conf.example
+        dst: /etc/glider/glider.conf.example
+
+    scripts:
+      postinstall: "systemd/postinstall.sh"
+      preremove: "systemd/preremove.sh"
+      postremove: "systemd/postremove.sh"
+
+    deb:
+      triggers:
+        interest_noawait:
+          - /lib/systemd/systemd

.travis.yml

@@ -1,6 +0,0 @@
-language: go
-
-go:
-  - 1.9
-  - tip
-

Dockerfile

@@ -0,0 +1,14 @@
+# Build Stage
+FROM golang:1.24-alpine AS build-env
+ADD . /src
+RUN apk --no-cache add git \
+    && cd /src && go build -v -ldflags "-s -w"
+
+# Final Stage
+FROM alpine
+COPY --from=build-env /src/glider /app/
+WORKDIR /app
+RUN apk -U upgrade --no-cache \
+    && apk --no-cache add ca-certificates
+USER 1000
+ENTRYPOINT ["./glider"]

README.md

@@ -1,173 +1,431 @@
 # [glider](https://github.com/nadoo/glider)
 
-[![Build Status](https://img.shields.io/travis/nadoo/glider.svg?style=flat-square)](https://travis-ci.org/nadoo/glider)
+[![Go Version](https://img.shields.io/github/go-mod/go-version/nadoo/glider?style=flat-square)](https://go.dev/dl/)
 [![Go Report Card](https://goreportcard.com/badge/github.com/nadoo/glider?style=flat-square)](https://goreportcard.com/report/github.com/nadoo/glider)
-[![GitHub tag](https://img.shields.io/github/tag/nadoo/glider.svg?style=flat-square)](https://github.com/nadoo/glider/releases)
-[![GitHub release](https://img.shields.io/github/release/nadoo/glider.svg?style=flat-square)](https://github.com/nadoo/glider/releases)
+[![GitHub release](https://img.shields.io/github/v/release/nadoo/glider.svg?style=flat-square&include_prereleases)](https://github.com/nadoo/glider/releases)
+[![Actions Status](https://img.shields.io/github/actions/workflow/status/nadoo/glider/build.yml?branch=dev&style=flat-square)](https://github.com/nadoo/glider/actions)
+[![DockerHub](https://img.shields.io/docker/image-size/nadoo/glider?color=blue&label=docker&style=flat-square)](https://hub.docker.com/r/nadoo/glider)
 
-glider is a forward proxy with multiple protocols support, and also a dns forwarding server with ipset management features(like dnsmasq).
+glider is a forward proxy with multiple protocols support, and also a dns/dhcp server with ipset management features(like dnsmasq).
 
 we can set up local listeners as proxy servers, and forward requests to internet via forwarders.
-```
+
+```bash
                 |Forwarder ----------------->|
    Listener --> |                            | Internet
                 |Forwarder --> Forwarder->...|
 ```
 
 ## Features
-Listen(local proxy server):
-- Socks5 proxy
-- Http proxy
-- SS proxy
-- Linux transparent proxy(iptables redirect)
-- TCP tunnel
-- DNS Tunnel(udp2tcp)
+- Act as both proxy client and proxy server(protocol converter)
+- Flexible proxy & protocol chains
+- Load balancing with the following scheduling algorithm:
+  - rr: round robin
+  - ha: high availability 
+  - lha: latency based high availability
+  - dh: destination hashing
+- Rule & priority based forwarder choosing: [Config Examples](config/examples)
+- DNS forwarding server:
+  - dns over proxy
+  - force upstream querying by tcp
+  - association rules between dns and forwarder choosing
+  - association rules between dns and ipset
+  - dns cache support
+  - custom dns record
+- IPSet management (linux kernel version >= 2.6.32):
+  - add ip/cidrs from rule files on startup
+  - add resolved ips for domains from rule files by dns forwarding server
+- Serve http and socks5 on the same port
+- Periodical availability checking for forwarders
+- Send requests from specific local ip/interface
+- Services: 
+  - dhcpd: a simple dhcp server that can run in failover mode
 
-Forward(upstream proxy server):
-- Socks5 proxy
-- Http proxy
-- SS proxy
+## Protocols
 
-DNS Forwarding Server(udp2tcp):
-- Listen on UDP and forward dns requests to remote dns server in TCP via forwarders
-- Specify different upstream dns server based on destinations(in rule file)
-- Tunnel mode: forward to a fixed upstream dns server
-- Add resolved IPs to proxy rules
-- Add resolved IPs to ipset
+<details>
+<summary>click to see details</summary>
 
-IPSet Management:
-- Add ip/cidrs from rule files on startup
-- Add resolved ips for domains from rule files by dns forwarding server 
+|Protocol       | Listen/TCP |  Listen/UDP | Forward/TCP | Forward/UDP | Description
+|:-:            |:-:|:-:|:-:|:-:|:-
+|Mixed          |√|√| | |http+socks5 server
+|HTTP           |√| |√| |client & server
+|SOCKS5         |√|√|√|√|client & server
+|SS             |√|√|√|√|client & server
+|Trojan         |√|√|√|√|client & server
+|Trojanc        |√|√|√|√|trojan cleartext(without tls)
+|VLESS          |√|√|√|√|client & server
+|VMess          | | |√|√|client only
+|SSR            | | |√| |client only
+|SSH            | | |√| |client only
+|SOCKS4         | | |√| |client only
+|SOCKS4A        | | |√| |client only
+|TCP            |√| |√| |tcp tunnel client & server
+|UDP            | |√| |√|udp tunnel client & server
+|TLS            |√| |√| |transport client & server
+|KCP            | |√|√| |transport client & server
+|Unix           |√|√|√|√|transport client & server
+|VSOCK          |√| |√| |transport client & server
+|Smux           |√| |√| |transport client & server
+|Websocket(WS)  |√| |√| |transport client & server
+|WS Secure      |√| |√| |websocket secure (wss)
+|Proxy Protocol |√| | | |version 1 server only
+|Simple-Obfs    | | |√| |transport client only
+|Redir          |√| | | |linux redirect proxy
+|Redir6         |√| | | |linux redirect proxy(ipv6)
+|TProxy         | |√| | |linux tproxy(udp only)
+|Reject         | | |√|√|reject all requests
 
-General:
-- Http and socks5 on the same port
-- Forward chain
-- HA or RR strategy for multiple forwarders
-- Periodical proxy checking
-- Rule proxy based on destinations: [Config Examples](config/examples)
-
-TODO:
-- [x] UDP over TCP Tunnel (client <--udp--> glider/uottun <--tcp--> ss <--udp--> target)
-- [ ] Transparent UDP proxy (linux tproxy)
-- [ ] TUN/TAP device support
-- [ ] Code refactoring: support proxy registering so it can be pluggable
-- [ ] Conditional compilation so we can abandon needless proxy type and get a smaller binary size
-- [ ] IPv6 support
-- [ ] SSH tunnel support
+</details>
 
 ## Install
-Binary: 
-- [https://github.com/nadoo/glider/releases](https://github.com/nadoo/glider/releases)
 
-Go Get (requires **Go 1.9+** ):
-```bash
-go get -u github.com/nadoo/glider
-```
-
-ArchLinux: 
-```bash
-sudo pacman -S glider
-```
-
-## Run
-command line:
-```bash
-glider -listen :8443 -verbose
-```
-
-config file:
-```bash
-glider -config CONFIGPATH
-```
-
-command line with config file:
-```bash
-glider -config CONFIGPATH -listen :8080 -verbose
-```
+- Binary: [https://github.com/nadoo/glider/releases](https://github.com/nadoo/glider/releases)
+- Docker: `docker pull nadoo/glider`
+- Manjaro: `pamac install glider`
+- ArchLinux: `sudo pacman -S glider`
+- Homebrew: `brew install glider`
+- MacPorts: `sudo port install glider`
+- Source: `go install github.com/nadoo/glider@latest`
 
 ## Usage
+
+#### Run
+
 ```bash
-glider v0.3.1 usage:
-  -checkduration int
-        proxy check duration(seconds) (default 30)
-  -checkwebsite string
-        proxy check HTTP(NOT HTTPS) website address, format: HOST[:PORT], default port: 80 (default "www.apple.com")
+glider -verbose -listen :8443
+# docker run --rm -it nadoo/glider -verbose -listen :8443
+```
+
+#### Help
+
+<details>
+<summary><code>glider -help</code></summary>
+
+```bash
+Usage: glider [-listen URL]... [-forward URL]... [OPTION]...
+
+  e.g. glider -config /etc/glider/glider.conf
+       glider -listen :8443 -forward socks5://serverA:1080 -forward socks5://serverB:1080 -verbose
+
+OPTION:
+  -check string
+        check=tcp[://HOST:PORT]: tcp port connect check
+        check=http://HOST[:PORT][/URI][#expect=REGEX_MATCH_IN_RESP_LINE]
+        check=https://HOST[:PORT][/URI][#expect=REGEX_MATCH_IN_RESP_LINE]
+        check=file://SCRIPT_PATH: run a check script, healthy when exitcode=0, env vars: FORWARDER_ADDR,FORWARDER_URL
+        check=disable: disable health check (default "http://www.msftconnecttest.com/connecttest.txt#expect=200")
+  -checkdisabledonly
+        check disabled fowarders only
+  -checkinterval int
+        fowarder check interval(seconds) (default 30)
+  -checklatencysamples int
+        use the average latency of the latest N checks (default 10)
+  -checktimeout int
+        fowarder check timeout(seconds) (default 10)
+  -checktolerance int
+        fowarder check tolerance(ms), switch only when new_latency < old_latency - tolerance, only used in lha mode
   -config string
         config file path
+  -dialtimeout int
+        dial timeout(seconds) (default 3)
+  -dns string
+        local dns server listen address
+  -dnsalwaystcp
+        always use tcp to query upstream dns servers no matter there is a forwarder or not
+  -dnscachelog
+        show query log of dns cache
+  -dnscachesize int
+        max number of dns response in CACHE (default 4096)
+  -dnsmaxttl int
+        maximum TTL value for entries in the CACHE(seconds) (default 1800)
+  -dnsminttl int
+        minimum TTL value for entries in the CACHE(seconds)
+  -dnsnoaaaa
+        disable AAAA query
+  -dnsrecord value
+        custom dns record, format: domain/ip
+  -dnsserver value
+        remote dns server address
+  -dnstimeout int
+        timeout value used in multiple dnsservers switch(seconds) (default 3)
+  -example
+        show usage examples
   -forward value
-        forward url, format: SCHEMA://[USER|METHOD:PASSWORD@][HOST]:PORT[,SCHEMA://[USER|METHOD:PASSWORD@][HOST]:PORT]
+        forward url, see the URL section below
+  -include value
+        include file
+  -interface string
+        source ip or source interface
   -listen value
-        listen url, format: SCHEMA://[USER|METHOD:PASSWORD@][HOST]:PORT
+        listen url, see the URL section below
+  -logflags int
+        do not change it if you do not know what it is, ref: https://pkg.go.dev/log#pkg-constants (default 19)
+  -maxfailures int
+        max failures to change forwarder status to disabled (default 3)
+  -relaytimeout int
+        relay timeout(seconds)
   -rulefile value
         rule file path
+  -rules-dir string
+        rule file folder
+  -scheme string
+        show help message of proxy scheme, use 'all' to see all schemes
+  -service value
+        run specified services, format: SERVICE_NAME[,SERVICE_CONFIG]
   -strategy string
-        forward strategy, default: rr (default "rr")
+        rr: Round Robin mode
+        ha: High Availability mode
+        lha: Latency based High Availability mode
+        dh: Destination Hashing mode (default "rr")
+  -tcpbufsize int
+        tcp buffer size in Bytes (default 32768)
+  -udpbufsize int
+        udp buffer size in Bytes (default 2048)
   -verbose
         verbose mode
 
-Available Schemas:
-  mixed: serve as a http/socks5 proxy on the same port. (default)
-  ss: ss proxy
-  socks5: socks5 proxy
-  http: http proxy
-  redir: redirect proxy. (used on linux as a transparent proxy with iptables redirect rules)
-  tcptun: a simple tcp tunnel
-  dnstun: listen on udp port and forward all dns requests to remote dns server via forwarders(tcp)
+URL:
+   proxy: SCHEME://[USER:PASS@][HOST]:PORT
+   chain: proxy,proxy[,proxy]...
 
-Available schemas for different modes:
-  listen: mixed ss socks5 http redir tcptun dnstun
-  forward: ss socks5 http
+    e.g. -listen socks5://:1080
+         -listen tls://:443?cert=crtFilePath&key=keyFilePath,http://    (protocol chain)
+
+    e.g. -forward socks5://server:1080
+         -forward tls://server.com:443,http://                          (protocol chain)
+         -forward socks5://serverA:1080,socks5://serverB:1080           (proxy chain)
+
+SCHEME:
+   listen : http kcp mixed pxyproto redir redir6 smux sni socks5 ss tcp tls tproxy trojan trojanc udp unix vless vsock ws wss
+   forward: direct http kcp reject simple-obfs smux socks4 socks4a socks5 ss ssh ssr tcp tls trojan trojanc udp unix vless vmess vsock ws wss
+
+   Note: use 'glider -scheme all' or 'glider -scheme SCHEME' to see help info for the scheme.
+
+--
+Forwarder Options: FORWARD_URL#OPTIONS
+   priority : the priority of that forwarder, the larger the higher, default: 0
+   interface: the local interface or ip address used to connect remote server.
+
+   e.g. -forward socks5://server:1080#priority=100
+        -forward socks5://server:1080#interface=eth0
+        -forward socks5://server:1080#priority=100&interface=192.168.1.99
+
+Services:
+   dhcpd: service=dhcpd,INTERFACE,START_IP,END_IP,LEASE_MINUTES[,MAC=IP,MAC=IP...]
+          service=dhcpd-failover,INTERFACE,START_IP,END_IP,LEASE_MINUTES[,MAC=IP,MAC=IP...]
+     e.g. service=dhcpd,eth1,192.168.1.100,192.168.1.199,720
+
+--
+Help:
+   glider -help
+   glider -scheme all
+   glider -example
+
+see README.md and glider.conf.example for more details.
+--
+glider 0.16.4, https://github.com/nadoo/glider (glider.proxy@gmail.com)
+```
+
+</details>
+
+#### Schemes
+
+<details>
+<summary><code>glider -scheme all</code></summary>
+
+```bash
+Direct scheme:
+  direct://
+
+Only needed when you want to specify the outgoing interface:
+  glider -verbose -listen :8443 -forward direct://#interface=eth0
+
+Or load balance multiple interfaces directly:
+  glider -verbose -listen :8443 -forward direct://#interface=eth0 -forward direct://#interface=eth1 -strategy rr
+
+Or you can use the high availability mode:
+  glider -verbose -listen :8443 -forward direct://#interface=eth0&priority=100 -forward direct://#interface=eth1&priority=200 -strategy ha
+
+--
+Http scheme:
+  http://[user:pass@]host:port
+
+--
+KCP scheme:
+  kcp://CRYPT:KEY@host:port[?dataShards=NUM&parityShards=NUM&mode=MODE]
+  
+Available crypt types for KCP:
+  none, sm4, tea, xor, aes, aes-128, aes-192, blowfish, twofish, cast5, 3des, xtea, salsa20
+  
+Available modes for KCP:
+  fast, fast2, fast3, normal, default: fast
+
+--
+Simple-Obfs scheme:
+  simple-obfs://host:port[?type=TYPE&host=HOST&uri=URI&ua=UA]
+  
+Available types for simple-obfs:
+  http, tls
+
+--
+Reject scheme:
+  reject://
+
+--
+Smux scheme:
+  smux://host:port
+
+--
+Socks4 scheme:
+  socks4://host:port
+
+--
+Socks5 scheme:
+  socks5://[user:pass@]host:port
+
+--
+SS scheme:
+  ss://method:pass@host:port
   
   Available methods for ss:
-  AEAD_AES_128_GCM AEAD_AES_192_GCM AEAD_AES_256_GCM AEAD_CHACHA20_POLY1305 AES-128-CFB AES-128-CTR AES-192-CFB AES-192-CTR AES-256-CFB AES-256-CTR CHACHA20-IETF XCHACHA20
-  NOTE: chacha20-ietf-poly1305 = AEAD_CHACHA20_POLY1305
+    AEAD Ciphers:
+      AEAD_AES_128_GCM AEAD_AES_192_GCM AEAD_AES_256_GCM AEAD_CHACHA20_POLY1305 AEAD_XCHACHA20_POLY1305
+    Stream Ciphers:
+      AES-128-CFB AES-128-CTR AES-192-CFB AES-192-CTR AES-256-CFB AES-256-CTR CHACHA20-IETF XCHACHA20 CHACHA20 RC4-MD5
+    Alias:
+          chacha20-ietf-poly1305 = AEAD_CHACHA20_POLY1305, xchacha20-ietf-poly1305 = AEAD_XCHACHA20_POLY1305
+    Plain: NONE
 
-Available forward strategies:
-  rr: Round Robin mode
-  ha: High Availability mode
+--
+SSH scheme:
+  ssh://user[:pass]@host:port[?key=keypath&timeout=SECONDS]
+    timeout: timeout of ssh handshake and channel operation, default: 5
 
-Config file format(see `glider.conf.example` as an example):
-  # COMMENT LINE
-  KEY=VALUE
-  KEY=VALUE
-  # KEY equals to command line flag name: listen forward strategy...
+--
+SSR scheme:
+  ssr://method:pass@host:port?protocol=xxx&protocol_param=yyy&obfs=zzz&obfs_param=xyz
 
+--
+TLS client scheme:
+  tls://host:port[?serverName=SERVERNAME][&skipVerify=true][&cert=PATH][&alpn=proto1][&alpn=proto2]
+  
+Proxy over tls client:
+  tls://host:port[?skipVerify=true][&serverName=SERVERNAME],scheme://
+  tls://host:port[?skipVerify=true],http://[user:pass@]
+  tls://host:port[?skipVerify=true],socks5://[user:pass@]
+  tls://host:port[?skipVerify=true],vmess://[security:]uuid@?alterID=num
+  
+TLS server scheme:
+  tls://host:port?cert=PATH&key=PATH[&alpn=proto1][&alpn=proto2]
+  
+Proxy over tls server:
+  tls://host:port?cert=PATH&key=PATH,scheme://
+  tls://host:port?cert=PATH&key=PATH,http://
+  tls://host:port?cert=PATH&key=PATH,socks5://
+  tls://host:port?cert=PATH&key=PATH,ss://method:pass@
+
+--
+Trojan client scheme:
+  trojan://pass@host:port[?serverName=SERVERNAME][&skipVerify=true][&cert=PATH]
+  trojanc://pass@host:port     (cleartext, without TLS)
+  
+Trojan server scheme:
+  trojan://pass@host:port?cert=PATH&key=PATH[&fallback=127.0.0.1]
+  trojanc://pass@host:port[?fallback=127.0.0.1]     (cleartext, without TLS)
+
+--
+Unix domain socket scheme:
+  unix://path
+
+--
+VLESS scheme:
+  vless://uuid@host:port[?fallback=127.0.0.1:80]
+
+--
+VMess scheme:
+  vmess://[security:]uuid@host:port[?alterID=num]
+    if alterID=0 or not set, VMessAEAD will be enabled
+  
+  Available security for vmess:
+    zero, none, aes-128-gcm, chacha20-poly1305
+
+--
+Websocket client scheme:
+  ws://host:port[/path][?host=HOST][&origin=ORIGIN]
+  wss://host:port[/path][?serverName=SERVERNAME][&skipVerify=true][&cert=PATH][&host=HOST][&origin=ORIGIN]
+  
+Websocket server scheme:
+  ws://:port[/path][?host=HOST]
+  wss://:port[/path]?cert=PATH&key=PATH[?host=HOST]
+  
+Websocket with a specified proxy protocol:
+  ws://host:port[/path][?host=HOST],scheme://
+  ws://host:port[/path][?host=HOST],http://[user:pass@]
+  ws://host:port[/path][?host=HOST],socks5://[user:pass@]
+  
+TLS and Websocket with a specified proxy protocol:
+  tls://host:port[?skipVerify=true][&serverName=SERVERNAME],ws://[@/path[?host=HOST]],scheme://
+  tls://host:port[?skipVerify=true],ws://[@/path[?host=HOST]],http://[user:pass@]
+  tls://host:port[?skipVerify=true],ws://[@/path[?host=HOST]],socks5://[user:pass@]
+  tls://host:port[?skipVerify=true],ws://[@/path[?host=HOST]],vmess://[security:]uuid@?alterID=num
+
+--
+VM socket scheme(linux only):
+  vsock://[CID]:port
+
+  if you want to listen on any address, just set CID to 4294967295.
+```
+
+</details>
+
+#### Examples
+
+<details>
+<summary><code>glider -example</code></summary>
+
+```bash
 Examples:
   glider -config glider.conf
     -run glider with specified config file.
   
-  glider -config glider.conf -rulefile office.rule -rulefile home.rule
-    -run glider with specified global config file and rule config files.
+  glider -listen :8443 -verbose
+    -listen on :8443, serve as http/socks5 proxy on the same port, in verbose mode.
 
-  glider -listen :8443
-    -listen on :8443, serve as http/socks5 proxy on the same port.
+  glider -listen socks5://:1080 -listen http://:8080 -verbose
+    -multiple listeners: listen on :1080 as socks5 proxy server, and on :8080 as http proxy server.
   
-  glider -listen ss://AEAD_CHACHA20_POLY1305:pass@:8443
-    -listen on 0.0.0.0:8443 as a ss server.
+  glider -listen :8443 -forward direct://#interface=eth0 -forward direct://#interface=eth1
+    -multiple forwarders: listen on 8443 and forward requests via interface eth0 and eth1 in round robin mode.
   
-  glider -listen socks5://:1080 -verbose
-    -listen on :1080 as a socks5 proxy server, in verbose mode.
+  glider -listen tls://:443?cert=crtFilePath&key=keyFilePath,http:// -verbose
+    -protocol chain: listen on :443 as a https(http over tls) proxy server.
   
-  glider -listen http://:8080 -forward socks5://127.0.0.1:1080
-    -listen on :8080 as a http proxy server, forward all requests via socks5 server.
+  glider -listen http://:8080 -forward socks5://serverA:1080,socks5://serverB:1080
+    -proxy chain: listen on :8080 as a http proxy server, forward all requests via forward chain.
   
-  glider -listen redir://:1081 -forward ss://method:pass@1.1.1.1:8443
-    -listen on :1081 as a transparent redirect server, forward all requests via remote ss server.
+  glider -listen :8443 -forward socks5://serverA:1080 -forward socks5://serverB:1080#priority=10 -forward socks5://serverC:1080#priority=10
+    -forwarder priority: serverA will only be used when serverB and serverC are not available.
   
-  glider -listen tcptun://:80=2.2.2.2:80 -forward ss://method:pass@1.1.1.1:8443
-    -listen on :80 and forward all requests to 2.2.2.2:80 via remote ss server.
+  glider -listen tcp://:80 -forward tcp://serverA:80
+    -tcp tunnel: listen on :80 and forward all requests to serverA:80.
   
-  glider -listen socks5://:1080 -listen http://:8080 -forward ss://method:pass@1.1.1.1:8443
-    -listen on :1080 as socks5 server, :8080 as http proxy server, forward all requests via remote ss server.
+  glider -listen udp://:53 -forward socks5://serverA:1080,udp://8.8.8.8:53
+    -udp tunnel: listen on :53 and forward all udp requests to 8.8.8.8:53 via remote socks5 server.
   
-  glider -listen redir://:1081 -listen dnstun://:53=8.8.8.8:53 -forward ss://method:pass@server1:port1,ss://method:pass@server2:port2
-    -listen on :1081 as transparent redirect server, :53 as dns server, use forward chain: server1 -> server2.
-
-  glider -listen socks5://:1080 -forward ss://method:pass@server1:port1 -forward ss://method:pass@server2:port2 -strategy rr
-    -listen on :1080 as socks5 server, forward requests via server1 and server2 in roundrbin mode.
+  glider -verbose -dns=:53 -dnsserver=8.8.8.8:53 -forward socks5://serverA:1080 -dnsrecord=abc.com/1.2.3.4
+    -dns over proxy: listen on :53 as dns server, forward to 8.8.8.8:53 via socks5 server.
+```
+
+</details>
+
+
+## Config
+
+```bash
+glider -config CONFIG_PATH
 ```
 
-## Advanced Usage
 - [ConfigFile](config)
   - [glider.conf.example](config/glider.conf.example)
   - [office.rule.example](config/rules.d/office.rule.example)
@@ -176,9 +434,109 @@ Examples:
   - [transparent proxy without dnsmasq](config/examples/9.transparent_proxy_without_dnsmasq)
 
 ## Service
-- systemd: [https://github.com/nadoo/glider/blob/master/systemd/](https://github.com/nadoo/glider/blob/master/systemd/)
+
+- dhcpd / dhcpd-failover:
+  - service=dhcpd,INTERFACE,START_IP,END_IP,LEASE_MINUTES[,MAC=IP,MAC=IP...]
+    - service=dhcpd,eth1,192.168.1.100,192.168.1.199,720,fc:23:34:9e:25:01=192.168.1.101
+    - service=dhcpd-failover,eth2,192.168.2.100,192.168.2.199,720
+  - note: `dhcpd-failover` only serves requests when there's no other dhcp server exists in lan
+    - detect interval: 1min
+
+## Linux Daemon
+
+- systemd: [https://github.com/nadoo/glider/tree/main/systemd](https://github.com/nadoo/glider/tree/main/systemd)
+
+- <details> <summary>docker: click to see details</summary>
+
+  - run glider (config file path: /etc/glider/glider.conf)
+    ```
+    docker run -d --name glider --net host --restart=always \
+      -v /etc/glider:/etc/glider \
+      -v /etc/localtime:/etc/localtime:ro \
+      nadoo/glider -config=/etc/glider/glider.conf
+    ```
+  - run watchtower if you need auto update
+    ```
+    docker run -d --name watchtower --restart=always \
+      -v /var/run/docker.sock:/var/run/docker.sock \
+      containrrr/watchtower --interval 21600 --cleanup \
+      glider
+    ```
+  - open udp ports if you need udp nat fullcone
+    ```
+    iptables -I INPUT -p udp -m udp --dport 1024:65535 -j ACCEPT
+    ```
+  
+  </details>
+
+
+## Customize Build
+
+<details><summary>You can customize and build glider if you want a smaller binary (click to see details)</summary>
+
+
+1. Clone the source code:
+  ```bash
+  git clone https://github.com/nadoo/glider && cd glider
+  ```
+2. Customize features:
+
+  ```bash
+  open `feature.go` & `feature_linux.go`, comment out the packages you don't need
+  // _ "github.com/nadoo/glider/proxy/kcp"
+  ```
+
+3. Build it:
+  ```bash
+  go build -v -ldflags "-s -w"
+  ```
+
+</details>
+
+## Proxy & Protocol Chains
+<details><summary>In glider, you can easily chain several proxy servers or protocols together (click to see details)</summary>
+
+- Chain proxy servers:
+
+  ```bash
+  forward=http://1.1.1.1:80,socks5://2.2.2.2:1080,ss://method:pass@3.3.3.3:8443@
+  ```
+
+- Chain protocols: https proxy (http over tls)
+
+  ```bash
+  forward=tls://server.com:443,http://
+  ```
+
+- Chain protocols: vmess over ws over tls
+
+  ```bash
+  forward=tls://server.com:443,ws://,vmess://5a146038-0b56-4e95-b1dc-5c6f5a32cd98@?alterID=2
+  ```
+
+- Chain protocols and servers:
+
+  ``` bash
+  forward=socks5://1.1.1.1:1080,tls://server.com:443,vmess://5a146038-0b56-4e95-b1dc-5c6f5a32cd98@?alterID=2
+  ```
+
+- Chain protocols in listener: https proxy server
+
+  ``` bash
+  listen=tls://:443?cert=crtFilePath&key=keyFilePath,http://
+  ```
+
+- Chain protocols in listener: http over smux over websocket proxy server
+
+  ``` bash
+  listen=ws://:10000,smux://,http://
+  ```
+
+</details>
 
 ## Links
-- [go-ss2](https://github.com/shadowsocks/go-shadowsocks2): ss protocol support
-- [conflag](https://github.com/nadoo/conflag): command line and config file parse support
-- [ArchLinux](https://www.archlinux.org/packages/community/x86_64/glider): a great linux distribution with glider pre-built package
+
+- [ipset](https://github.com/nadoo/ipset): netlink ipset package for Go.
+- [conflag](https://github.com/nadoo/conflag): a drop-in replacement for Go's standard flag package with config file support.
+- [ArchLinux](https://archlinux.org/packages/extra/x86_64/glider): a great linux distribution with glider pre-built package.
+- [urlencode](https://www.w3schools.com/tags/ref_urlencode.asp): you should encode special characters in scheme url. e.g., `@`->`%40`

conf.go

@@ -1,203 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"log"
-	"os"
-	"path"
-
-	"github.com/nadoo/conflag"
-)
-
-var flag = conflag.New()
-
-var conf struct {
-	Verbose       bool
-	Strategy      string
-	CheckWebSite  string
-	CheckDuration int
-	Listen        []string
-	Forward       []string
-	RuleFile      []string
-	RulesDir      string
-
-	DNS       string
-	DNSServer []string
-
-	IPSet string
-
-	rules []*RuleConf
-}
-
-func confInit() {
-	flag.BoolVar(&conf.Verbose, "verbose", false, "verbose mode")
-	flag.StringVar(&conf.Strategy, "strategy", "rr", "forward strategy, default: rr")
-	flag.StringVar(&conf.CheckWebSite, "checkwebsite", "www.apple.com", "proxy check HTTP(NOT HTTPS) website address, format: HOST[:PORT], default port: 80")
-	flag.IntVar(&conf.CheckDuration, "checkduration", 30, "proxy check duration(seconds)")
-	flag.StringSliceUniqVar(&conf.Listen, "listen", nil, "listen url, format: SCHEMA://[USER|METHOD:PASSWORD@][HOST]:PORT")
-	flag.StringSliceUniqVar(&conf.Forward, "forward", nil, "forward url, format: SCHEMA://[USER|METHOD:PASSWORD@][HOST]:PORT[,SCHEMA://[USER|METHOD:PASSWORD@][HOST]:PORT]")
-	flag.StringSliceUniqVar(&conf.RuleFile, "rulefile", nil, "rule file path")
-	flag.StringVar(&conf.RulesDir, "rules-dir", "", "rule file folder")
-
-	flag.StringVar(&conf.DNS, "dns", "", "dns forwarder server listen address")
-	flag.StringSliceUniqVar(&conf.DNSServer, "dnsserver", []string{"8.8.8.8:53"}, "remote dns server")
-
-	flag.StringVar(&conf.IPSet, "ipset", "", "ipset name")
-
-	flag.Usage = usage
-	err := flag.Parse()
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "ERROR: %s\n", err)
-		os.Exit(-1)
-	}
-
-	if len(conf.Listen) == 0 && conf.DNS == "" {
-		flag.Usage()
-		fmt.Fprintf(os.Stderr, "ERROR: listen url must be specified.\n")
-		os.Exit(-1)
-	}
-
-	// rulefiles
-	for _, ruleFile := range conf.RuleFile {
-		rule, err := NewRuleConfFromFile(ruleFile)
-		if err != nil {
-			log.Fatal(err)
-		}
-
-		conf.rules = append(conf.rules, rule)
-	}
-
-	if conf.RulesDir != "" {
-		conf.RulesDir = path.Join(flag.ConfDir(), conf.RulesDir)
-		ruleFolderFiles, _ := listDir(conf.RulesDir, ".rule")
-
-		for _, ruleFile := range ruleFolderFiles {
-			rule, err := NewRuleConfFromFile(ruleFile)
-			if err != nil {
-				log.Fatal(err)
-			}
-
-			conf.rules = append(conf.rules, rule)
-		}
-	}
-
-}
-
-// RuleConf , every ruleForwarder points to a rule file
-type RuleConf struct {
-	name string
-
-	Forward       []string
-	Strategy      string
-	CheckWebSite  string
-	CheckDuration int
-
-	DNSServer []string
-	IPSet     string
-
-	Domain []string
-	IP     []string
-	CIDR   []string
-}
-
-// NewRuleConfFromFile .
-func NewRuleConfFromFile(ruleFile string) (*RuleConf, error) {
-	p := &RuleConf{name: ruleFile}
-
-	f := conflag.NewFromFile("rule", ruleFile)
-	f.StringSliceUniqVar(&p.Forward, "forward", nil, "forward url, format: SCHEMA://[USER|METHOD:PASSWORD@][HOST]:PORT[,SCHEMA://[USER|METHOD:PASSWORD@][HOST]:PORT]")
-	f.StringVar(&p.Strategy, "strategy", "rr", "forward strategy, default: rr")
-	f.StringVar(&p.CheckWebSite, "checkwebsite", "www.apple.com", "proxy check HTTP(NOT HTTPS) website address, format: HOST[:PORT], default port: 80")
-	f.IntVar(&p.CheckDuration, "checkduration", 30, "proxy check duration(seconds)")
-
-	f.StringSliceUniqVar(&p.DNSServer, "dnsserver", nil, "remote dns server")
-	f.StringVar(&p.IPSet, "ipset", "", "ipset name")
-
-	f.StringSliceUniqVar(&p.Domain, "domain", nil, "domain")
-	f.StringSliceUniqVar(&p.IP, "ip", nil, "ip")
-	f.StringSliceUniqVar(&p.CIDR, "cidr", nil, "cidr")
-
-	err := f.Parse()
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "ERROR: %s\n", err)
-		return nil, err
-	}
-
-	return p, err
-}
-
-func usage() {
-	app := os.Args[0]
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "%s v%s usage:\n", app, VERSION)
-	flag.PrintDefaults()
-	fmt.Fprintf(os.Stderr, "\n")
-
-	fmt.Fprintf(os.Stderr, "Available Schemas:\n")
-	fmt.Fprintf(os.Stderr, "  mixed: serve as a http/socks5 proxy on the same port. (default)\n")
-	fmt.Fprintf(os.Stderr, "  ss: ss proxy\n")
-	fmt.Fprintf(os.Stderr, "  socks5: socks5 proxy\n")
-	fmt.Fprintf(os.Stderr, "  http: http proxy\n")
-	fmt.Fprintf(os.Stderr, "  redir: redirect proxy. (used on linux as a transparent proxy with iptables redirect rules)\n")
-	fmt.Fprintf(os.Stderr, "  tcptun: a simple tcp tunnel\n")
-	fmt.Fprintf(os.Stderr, "  dnstun: listen on udp port and forward all dns requests to remote dns server via forwarders(tcp)\n")
-	fmt.Fprintf(os.Stderr, "\n")
-
-	fmt.Fprintf(os.Stderr, "Available schemas for different modes:\n")
-	fmt.Fprintf(os.Stderr, "  listen: mixed ss socks5 http redir tcptun dnstun\n")
-	fmt.Fprintf(os.Stderr, "  forward: ss socks5 http\n")
-	fmt.Fprintf(os.Stderr, "\n")
-
-	fmt.Fprintf(os.Stderr, "Available methods for ss:\n")
-	fmt.Fprintf(os.Stderr, "  "+ListCipher())
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  NOTE: chacha20-ietf-poly1305 = AEAD_CHACHA20_POLY1305\n")
-	fmt.Fprintf(os.Stderr, "\n")
-
-	fmt.Fprintf(os.Stderr, "Available forward strategies:\n")
-	fmt.Fprintf(os.Stderr, "  rr: Round Robin mode\n")
-	fmt.Fprintf(os.Stderr, "  ha: High Availability mode\n")
-	fmt.Fprintf(os.Stderr, "\n")
-
-	fmt.Fprintf(os.Stderr, "Config file format(see `"+app+".conf.example` as an example):\n")
-	fmt.Fprintf(os.Stderr, "  # COMMENT LINE\n")
-	fmt.Fprintf(os.Stderr, "  KEY=VALUE\n")
-	fmt.Fprintf(os.Stderr, "  KEY=VALUE\n")
-	fmt.Fprintf(os.Stderr, "  # KEY equals to command line flag name: listen forward strategy...\n")
-	fmt.Fprintf(os.Stderr, "\n")
-
-	fmt.Fprintf(os.Stderr, "Examples:\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -config glider.conf\n")
-	fmt.Fprintf(os.Stderr, "    -run glider with specified config file.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -config glider.conf -rulefile office.rule -rulefile home.rule\n")
-	fmt.Fprintf(os.Stderr, "    -run glider with specified global config file and rule config files.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -listen :8443\n")
-	fmt.Fprintf(os.Stderr, "    -listen on :8443, serve as http/socks5 proxy on the same port.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -listen ss://AEAD_CHACHA20_POLY1305:pass@:8443\n")
-	fmt.Fprintf(os.Stderr, "    -listen on 0.0.0.0:8443 as a ss server.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -listen socks5://:1080 -verbose\n")
-	fmt.Fprintf(os.Stderr, "    -listen on :1080 as a socks5 proxy server, in verbose mode.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -listen http://:8080 -forward socks5://127.0.0.1:1080\n")
-	fmt.Fprintf(os.Stderr, "    -listen on :8080 as a http proxy server, forward all requests via socks5 server.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -listen redir://:1081 -forward ss://method:pass@1.1.1.1:8443\n")
-	fmt.Fprintf(os.Stderr, "    -listen on :1081 as a transparent redirect server, forward all requests via remote ss server.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -listen tcptun://:80=2.2.2.2:80 -forward ss://method:pass@1.1.1.1:8443\n")
-	fmt.Fprintf(os.Stderr, "    -listen on :80 and forward all requests to 2.2.2.2:80 via remote ss server.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -listen socks5://:1080 -listen http://:8080 -forward ss://method:pass@1.1.1.1:8443\n")
-	fmt.Fprintf(os.Stderr, "    -listen on :1080 as socks5 server, :8080 as http proxy server, forward all requests via remote ss server.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -listen redir://:1081 -listen dnstun://:53=8.8.8.8:53 -forward ss://method:pass@server1:port1,ss://method:pass@server2:port2\n")
-	fmt.Fprintf(os.Stderr, "    -listen on :1081 as transparent redirect server, :53 as dns server, use forward chain: server1 -> server2.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -listen socks5://:1080 -forward ss://method:pass@server1:port1 -forward ss://method:pass@server2:port2 -strategy rr\n")
-	fmt.Fprintf(os.Stderr, "    -listen on :1080 as socks5 server, forward requests via server1 and server2 in roundrbin mode.\n")
-	fmt.Fprintf(os.Stderr, "\n")
-}

config.go

@@ -0,0 +1,254 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path"
+
+	"github.com/nadoo/conflag"
+
+	"github.com/nadoo/glider/dns"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/proxy"
+	"github.com/nadoo/glider/rule"
+)
+
+var flag = conflag.New()
+
+// Config is global config struct.
+type Config struct {
+	Verbose    bool
+	LogFlags   int
+	TCPBufSize int
+	UDPBufSize int
+
+	Listens []string
+
+	Forwards []string
+	Strategy rule.Strategy
+
+	RuleFiles []string
+	RulesDir  string
+
+	DNS       string
+	DNSConfig dns.Config
+
+	rules []*rule.Config
+
+	Services []string
+}
+
+func parseConfig() *Config {
+	conf := &Config{}
+
+	flag.SetOutput(os.Stdout)
+
+	scheme := flag.String("scheme", "", "show help message of proxy scheme, use 'all' to see all schemes")
+	example := flag.Bool("example", false, "show usage examples")
+
+	flag.BoolVar(&conf.Verbose, "verbose", false, "verbose mode")
+	flag.IntVar(&conf.LogFlags, "logflags", 19, "do not change it if you do not know what it is, ref: https://pkg.go.dev/log#pkg-constants")
+	flag.IntVar(&conf.TCPBufSize, "tcpbufsize", 32768, "tcp buffer size in Bytes")
+	flag.IntVar(&conf.UDPBufSize, "udpbufsize", 2048, "udp buffer size in Bytes")
+	flag.StringSliceUniqVar(&conf.Listens, "listen", nil, "listen url, see the URL section below")
+
+	flag.StringSliceVar(&conf.Forwards, "forward", nil, "forward url, see the URL section below")
+	flag.StringVar(&conf.Strategy.Strategy, "strategy", "rr", `rr: Round Robin mode
+ha: High Availability mode
+lha: Latency based High Availability mode
+dh: Destination Hashing mode`)
+	flag.StringVar(&conf.Strategy.Check, "check", "http://www.msftconnecttest.com/connecttest.txt#expect=200",
+		`check=tcp[://HOST:PORT]: tcp port connect check
+check=http://HOST[:PORT][/URI][#expect=REGEX_MATCH_IN_RESP_LINE]
+check=https://HOST[:PORT][/URI][#expect=REGEX_MATCH_IN_RESP_LINE]
+check=file://SCRIPT_PATH: run a check script, healthy when exitcode=0, env vars: FORWARDER_ADDR,FORWARDER_URL
+check=disable: disable health check`)
+	flag.IntVar(&conf.Strategy.CheckInterval, "checkinterval", 30, "fowarder check interval(seconds)")
+	flag.IntVar(&conf.Strategy.CheckTimeout, "checktimeout", 10, "fowarder check timeout(seconds)")
+	flag.IntVar(&conf.Strategy.CheckTolerance, "checktolerance", 0, "fowarder check tolerance(ms), switch only when new_latency < old_latency - tolerance, only used in lha mode")
+	flag.IntVar(&conf.Strategy.CheckLatencySamples, "checklatencysamples", 10, "use the average latency of the latest N checks")
+	flag.BoolVar(&conf.Strategy.CheckDisabledOnly, "checkdisabledonly", false, "check disabled fowarders only")
+	flag.IntVar(&conf.Strategy.MaxFailures, "maxfailures", 3, "max failures to change forwarder status to disabled")
+	flag.IntVar(&conf.Strategy.DialTimeout, "dialtimeout", 3, "dial timeout(seconds)")
+	flag.IntVar(&conf.Strategy.RelayTimeout, "relaytimeout", 0, "relay timeout(seconds)")
+	flag.StringVar(&conf.Strategy.IntFace, "interface", "", "source ip or source interface")
+
+	flag.StringSliceUniqVar(&conf.RuleFiles, "rulefile", nil, "rule file path")
+	flag.StringVar(&conf.RulesDir, "rules-dir", "", "rule file folder")
+
+	// dns configs
+	flag.StringVar(&conf.DNS, "dns", "", "local dns server listen address")
+	flag.StringSliceUniqVar(&conf.DNSConfig.Servers, "dnsserver", []string{"8.8.8.8:53"}, "remote dns server address")
+	flag.BoolVar(&conf.DNSConfig.AlwaysTCP, "dnsalwaystcp", false, "always use tcp to query upstream dns servers no matter there is a forwarder or not")
+	flag.IntVar(&conf.DNSConfig.Timeout, "dnstimeout", 3, "timeout value used in multiple dnsservers switch(seconds)")
+	flag.IntVar(&conf.DNSConfig.MaxTTL, "dnsmaxttl", 1800, "maximum TTL value for entries in the CACHE(seconds)")
+	flag.IntVar(&conf.DNSConfig.MinTTL, "dnsminttl", 0, "minimum TTL value for entries in the CACHE(seconds)")
+	flag.IntVar(&conf.DNSConfig.CacheSize, "dnscachesize", 4096, "max number of dns response in CACHE")
+	flag.BoolVar(&conf.DNSConfig.CacheLog, "dnscachelog", false, "show query log of dns cache")
+	flag.BoolVar(&conf.DNSConfig.NoAAAA, "dnsnoaaaa", false, "disable AAAA query")
+	flag.StringSliceUniqVar(&conf.DNSConfig.Records, "dnsrecord", nil, "custom dns record, format: domain/ip")
+
+	// service configs
+	flag.StringSliceUniqVar(&conf.Services, "service", nil, "run specified services, format: SERVICE_NAME[,SERVICE_CONFIG]")
+
+	flag.Usage = usage
+	if err := flag.Parse(); err != nil {
+		// flag.Usage()
+		fmt.Fprintf(os.Stderr, "ERROR: %s\n", err)
+		os.Exit(-1)
+	}
+
+	if *scheme != "" {
+		fmt.Fprint(flag.Output(), proxy.Usage(*scheme))
+		os.Exit(0)
+	}
+
+	if *example {
+		fmt.Fprint(flag.Output(), examples)
+		os.Exit(0)
+	}
+
+	// setup logger
+	log.Set(conf.Verbose, conf.LogFlags)
+
+	if len(conf.Listens) == 0 && conf.DNS == "" && len(conf.Services) == 0 {
+		// flag.Usage()
+		fmt.Fprintf(os.Stderr, "ERROR: listen url must be specified.\n")
+		os.Exit(-1)
+	}
+
+	// tcpbufsize
+	if conf.TCPBufSize > 0 {
+		proxy.TCPBufSize = conf.TCPBufSize
+	}
+
+	// udpbufsize
+	if conf.UDPBufSize > 0 {
+		proxy.UDPBufSize = conf.UDPBufSize
+	}
+
+	loadRules(conf)
+	return conf
+}
+
+func loadRules(conf *Config) {
+	// rulefiles
+	for _, ruleFile := range conf.RuleFiles {
+		if !path.IsAbs(ruleFile) {
+			ruleFile = path.Join(flag.ConfDir(), ruleFile)
+		}
+
+		rule, err := rule.NewConfFromFile(ruleFile)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		conf.rules = append(conf.rules, rule)
+	}
+
+	if conf.RulesDir != "" {
+		if !path.IsAbs(conf.RulesDir) {
+			conf.RulesDir = path.Join(flag.ConfDir(), conf.RulesDir)
+		}
+
+		ruleFolderFiles, _ := rule.ListDir(conf.RulesDir, ".rule")
+		for _, ruleFile := range ruleFolderFiles {
+			rule, err := rule.NewConfFromFile(ruleFile)
+			if err != nil {
+				log.Fatal(err)
+			}
+			conf.rules = append(conf.rules, rule)
+		}
+	}
+}
+
+func usage() {
+	fmt.Fprint(flag.Output(), usage1)
+	flag.PrintDefaults()
+	fmt.Fprintf(flag.Output(), usage2, proxy.ServerSchemes(), proxy.DialerSchemes(), version)
+}
+
+var usage1 = `
+Usage: glider [-listen URL]... [-forward URL]... [OPTION]...
+
+  e.g. glider -config /etc/glider/glider.conf
+       glider -listen :8443 -forward socks5://serverA:1080 -forward socks5://serverB:1080 -verbose
+
+OPTION:
+`
+
+var usage2 = `
+URL:
+   proxy: SCHEME://[USER:PASS@][HOST]:PORT
+   chain: proxy,proxy[,proxy]...
+
+    e.g. -listen socks5://:1080
+         -listen tls://:443?cert=crtFilePath&key=keyFilePath,http://    (protocol chain)
+
+    e.g. -forward socks5://server:1080
+         -forward tls://server.com:443,http://                          (protocol chain)
+         -forward socks5://serverA:1080,socks5://serverB:1080           (proxy chain)
+
+SCHEME:
+   listen : %s
+   forward: %s
+
+   Note: use 'glider -scheme all' or 'glider -scheme SCHEME' to see help info for the scheme.
+
+--
+Forwarder Options: FORWARD_URL#OPTIONS
+   priority : the priority of that forwarder, the larger the higher, default: 0
+   interface: the local interface or ip address used to connect remote server.
+
+   e.g. -forward socks5://server:1080#priority=100
+        -forward socks5://server:1080#interface=eth0
+        -forward socks5://server:1080#priority=100&interface=192.168.1.99
+
+Services:
+   dhcpd: service=dhcpd,INTERFACE,START_IP,END_IP,LEASE_MINUTES[,MAC=IP,MAC=IP...]
+          service=dhcpd-failover,INTERFACE,START_IP,END_IP,LEASE_MINUTES[,MAC=IP,MAC=IP...]
+     e.g. service=dhcpd,eth1,192.168.1.100,192.168.1.199,720
+
+--
+Help:
+   glider -help
+   glider -scheme all
+   glider -example
+
+see README.md and glider.conf.example for more details.
+--
+glider %s, https://github.com/nadoo/glider (glider.proxy@gmail.com)
+`
+
+var examples = `
+Examples:
+  glider -config glider.conf
+    -run glider with specified config file.
+  
+  glider -listen :8443 -verbose
+    -listen on :8443, serve as http/socks5 proxy on the same port, in verbose mode.
+
+  glider -listen socks5://:1080 -listen http://:8080 -verbose
+    -multiple listeners: listen on :1080 as socks5 proxy server, and on :8080 as http proxy server.
+  
+  glider -listen :8443 -forward direct://#interface=eth0 -forward direct://#interface=eth1
+    -multiple forwarders: listen on 8443 and forward requests via interface eth0 and eth1 in round robin mode.
+  
+  glider -listen tls://:443?cert=crtFilePath&key=keyFilePath,http:// -verbose
+    -protocol chain: listen on :443 as a https(http over tls) proxy server.
+  
+  glider -listen http://:8080 -forward socks5://serverA:1080,socks5://serverB:1080
+    -proxy chain: listen on :8080 as a http proxy server, forward all requests via forward chain.
+  
+  glider -listen :8443 -forward socks5://serverA:1080 -forward socks5://serverB:1080#priority=10 -forward socks5://serverC:1080#priority=10
+    -forwarder priority: serverA will only be used when serverB and serverC are not available.
+  
+  glider -listen tcp://:80 -forward tcp://serverA:80
+    -tcp tunnel: listen on :80 and forward all requests to serverA:80.
+  
+  glider -listen udp://:53 -forward socks5://serverA:1080,udp://8.8.8.8:53
+    -udp tunnel: listen on :53 and forward all udp requests to 8.8.8.8:53 via remote socks5 server.
+  
+  glider -verbose -dns=:53 -dnsserver=8.8.8.8:53 -forward socks5://serverA:1080 -dnsrecord=abc.com/1.2.3.4
+    -dns over proxy: listen on :53 as dns server, forward to 8.8.8.8:53 via socks5 server.
+`

config/README.md

@@ -4,7 +4,15 @@ Command:
 ```bash
 glider -config glider.conf
 ```
-Config file, **just use the command line flag name as the key name**:
+Config file, **just use the command line flag name as key name**:
+```bash
+  # COMMENT LINE
+  KEY=VALUE
+  KEY=VALUE
+  # KEY equals to command line flag name: listen forward strategy...
+```
+
+Example:
 ```bash
 ### glider config file
 
@@ -14,9 +22,6 @@ verbose
 # listen on 8443, serve as http/socks5 proxy on the same port.
 listen=:8443
 
-# listen on udp port 5353, forward dns requests via tcp protocol
-listen=dnstun://:5353=8.8.8.8:53
-
 # upstream forward proxy
 forward=socks5://192.168.1.10:1080
 
@@ -26,37 +31,33 @@ forward=ss://method:pass@1.1.1.1:8443
 # upstream forward proxy (forward chain)
 forward=http://1.1.1.1:8080,socks5://2.2.2.2:1080
 
-# multiple upstream proxies forwad strategy
+# multiple upstream proxies forward strategy
 strategy=rr
 
-# Used to connect via forwarders, if the host is unreachable, the forwarder
-# will be set to disabled.
-# MUST be a HTTP website server address, format: HOST[:PORT]. HTTPS NOT SUPPORTED.
-checkwebsite=www.apple.com
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 
-# check duration
-checkduration=30
+# check interval
+checkinterval=30
 
 
 # Setup a dns forwarding server
-dns://53
+dns=:53
 # global remote dns server (you can specify different dns server in rule file)
 dnsserver=8.8.8.8:53
 
-# Create and manage ipset on linux based on destinations in rule files
-#   - add ip/cidrs in rule files on startup
-#   - add resolved ips for domains in rule files by dns forwarder server 
-# Usually used in transparent proxy mode on linux
-ipset=glider
-
 # RULE FILES
 rules-dir=rules.d
 #rulefile=office.rule
 #rulefile=home.rule
+
+# INCLUDE MORE CONFIG FILES
+#include=dnsrecord.inc.conf
+#include=more.inc.conf
 ```
 See:
-- [glider.conf.example](config/glider.conf.example)
-- [examples](config/examples)
+- [glider.conf.example](glider.conf.example)
+- [examples](examples)
 
 ## Rule File
 Rule file, **same as the config file but specify forwarders based on destinations**:
@@ -66,12 +67,20 @@ forward=socks5://192.168.1.10:1080
 forward=ss://method:pass@1.1.1.1:8443
 forward=http://192.168.2.1:8080,socks5://192.168.2.2:1080
 strategy=rr
-checkwebsite=www.apple.com
-checkduration=30
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
+checkinterval=30
 
 # DNS SERVER for domains in this rule file
 dnsserver=208.67.222.222:53
 
+# IPSET MANAGEMENT
+# ----------------
+# Create and mange ipset on linux based on destinations in rule files
+#   - add ip/cidrs in rule files on startup
+#   - add resolved ips for domains in rule files by dns forwarding server 
+# Usually used in transparent proxy mode on linux
+ipset=glider
+
 # YOU CAN SPECIFY DESTINATIONS TO USE THE ABOVE FORWARDERS
 # matches abc.com and *.abc.com
 domain=abc.com

config/dnsrecord.inc.conf.example

@@ -0,0 +1,7 @@
+
+# intranet
+dnsrecord=oa.yourcompany.local/10.0.0.1
+dnsrecord=git.yourcompany.local/10.0.0.2
+
+# ad
+#dnsrecord=ad.domain/127.0.0.1

config/examples/4.multiple_forwarders/glider.conf

@@ -12,10 +12,8 @@ forward=http://1.1.1.1:8080
 # High Availability mode: ha
 strategy=rr
 
-# Used to connect via forwarders, if the host is unreachable, the forwarder
-# will be set to disabled.
-# MUST be a HTTP website server address, format: HOST[:PORT]. HTTPS NOT SUPPORTED.
-checkwebsite=www.apple.com
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 
-# check duration(seconds)
-checkduration=30
+# check interval(seconds)
+checkinterval=30

config/examples/5.rule_default_direct/office.rule

@@ -8,8 +8,9 @@ forward=http://1.1.1.1:8080
 # High Availability mode: ha
 strategy=rr
 
-checkwebsite=www.apple.com
-checkduration=30
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
+checkinterval=30
 
 
 # matches abc.com and *.abc.com

config/examples/6.rule_default_forwarder/glider.conf

@@ -13,8 +13,9 @@ forward=http://1.1.1.1:8080
 # High Availability mode: ha
 strategy=rr
 
-checkwebsite=www.apple.com
-checkduration=30
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
+checkinterval=30
 
 
 # NOTE HERE:

config/examples/7.rule_multiple_rule_files/rules.d/home.rule

@@ -1,17 +1,18 @@
 
 
-forward=http://forwarder4:8080
+forward=http://forwarder1:8080
 
 # first connect forwarder1 then forwarder2 then internet
-forward=http://forwarder5:8080,socks6://forwarder3:1080
+forward=http://forwarder1:8080,socks5://forwarder2:1080
 
 
 # Round Robin mode: rr
 # High Availability mode: ha
 strategy=rr
 
-checkwebsite=www.apple.com
-checkduration=30
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
+checkinterval=30
 
 
 # matches 192.168.0.0/16

config/examples/7.rule_multiple_rule_files/rules.d/office.rule

@@ -10,8 +10,9 @@ forward=http://forwarder2:8080,socks5://forwarder3:1080
 # High Availability mode: ha
 strategy=rr
 
-checkwebsite=www.apple.com
-checkduration=30
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
+checkinterval=30
 
 
 # matches 172.16.0.0/24

config/examples/8.transparent_proxy_with_dnsmasq/README.md

@@ -1,22 +1,22 @@
 
 ## 8. Transparent Proxy with dnsmasq
 
-#### Setup a redirect proxy and a dnstunnel with glider
+#### Setup a redirect proxy and a dns server with glider
 glider.conf
 ```bash
 verbose=True
 listen=redir://:1081
-listen=dnstun://5353=8.8.8.8:53
 forward=http://forwarder1:8080,socks5://forwarder2:1080
 forward=http://1.1.1.1:8080
+dns=:5353
+dnsserver=8.8.8.8:53
 strategy=rr
-checkwebsite=www.apple.com
-checkduration=30
+checkinterval=30
 ```
 
 #### Create a ipset manually
 ```bash
-ipset create myset hash:ip
+ipset create myset hash:net
 ```
 
 #### Config dnsmasq
@@ -32,7 +32,7 @@ ipset=/example4.com/myset
 #### Config iptables on your linux gateway
 ```bash
 iptables -t nat -I PREROUTING -p tcp -m set --match-set myset dst -j REDIRECT --to-ports 1081
-iptables -t nat -I OUTPUT -p tcp -m set --match-set myset dst -j REDIRECT --to-ports 1081
+#iptables -t nat -I OUTPUT -p tcp -m set --match-set myset dst -j REDIRECT --to-ports 1081
 ```
 
 #### When client requests network, the whole process:

config/examples/8.transparent_proxy_with_dnsmasq/glider.conf

@@ -3,11 +3,15 @@
 verbose=True
 
 listen=redir://:1081
-listen=dnstun://5353=8.8.8.8:53
 
 forward=http://forwarder1:8080,socks5://forwarder2:1080
 forward=http://1.1.1.1:8080
 
+dns=:5353
+dnsserver=8.8.8.8:53
+
+
 strategy=rr
-checkwebsite=www.apple.com
-checkduration=30
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
+checkinterval=30

config/examples/9.transparent_proxy_without_dnsmasq/README.md

@@ -10,6 +10,11 @@ PC Client -> Gateway with glider running(linux box) -> Upstream Forwarders -> In
 
 so you don't need any dns server in your network.
 
+#### Create a ipset manually
+```bash
+ipset create glider hash:net
+```
+
 #### Glider Configuration
 ##### glider.conf
 ```bash
@@ -21,9 +26,7 @@ listen=redir://:1081
 # as a dns forwarding server
 dns=:53
 dnsserver=8.8.8.8:53
-
-# as a ipset manager
-ipset=glider
+dnsserver=8.8.4.4:53
 
 # specify rule files
 rules-dir=rules.d
@@ -35,12 +38,14 @@ rules-dir=rules.d
 forward=http://forwarder1:8080,socks5://forwarder2:1080
 forward=http://1.1.1.1:8080
 strategy=rr
-checkwebsite=www.apple.com
-checkduration=30
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 
 # specify a different dns server(if need)
 dnsserver=208.67.222.222:53
 
+# as a ipset manager
+ipset=glider
+
 # specify destinations
 include=office.list
 
@@ -61,29 +66,36 @@ domain=mycompany.com
 domain=mycompany1.com
 ip=4.4.4.4
 ip=5.5.5.5
-cidr=cidr=172.16.101.0/24
-cidr=cidr=172.16.102.0/24
+cidr=172.16.101.0/24
+cidr=172.16.102.0/24
 ```
 
-#### Config iptables on your linux gateway
+#### Configure iptables on your linux gateway
 ```bash
 iptables -t nat -I PREROUTING -p tcp -m set --match-set glider dst -j REDIRECT --to-ports 1081
 iptables -t nat -I OUTPUT -p tcp -m set --match-set glider dst -j REDIRECT --to-ports 1081
 ```
 
-#### Client DNS settings
-use the linux server's ip as your dns server
+#### Server DNS settings
+Set server's nameserver to glider:
+```bash
+echo nameserver 127.0.0.1 > /etc/resolv.conf
+```
+
+#### Client settings
+Use the linux server's ip as your gateway.
+Use the linux server's ip as your dns server.
 
 #### When client requesting to access http://example1.com (in office.rule), the whole process:
 DNS Resolving: 
-1. client sends a udp dns request to linux server, and glider will receive the request(as it listen on default dns port :53)
-2. upstream dns server choice: glider will lookup it's rule config and find out the dns server to use for this domain(matched "example1.com" in office.rule, so 208.67.222.222:53 will be choosen)
-3. glider uses the forwarder in office.rule to ask 208.67.222.222:53 for the resolve answers
-4. glider updates it's office rule config, add the resolved ip address to it
-5. glider adds the resolved ip into ipset "glider", and return the dns answer to client
+1. client sends a udp dns request to linux server, and glider will receive the request(as it listens on the default dns port :53)
+2. upstream dns server choice: glider will lookup it's rule config and find out the dns server to use for this domain(matched "example1.com" in office.rule, so 208.67.222.222:53 will be chosen)
+3. glider uses the forwarder in office.rule to ask 208.67.222.222:53 for the resolve answers(dns over proxy).
+4. glider updates it's office rule config, adds the resolved ip address to it.
+5. glider adds the resolved ip into ipset "glider", and returns the dns answer to client.
 
 Destination Accessing:
-1. client sends http request to the resolved ip of example1.com
-2. linux gateway server will get the request
-3. iptabes matches the ip in ipset "glider" and redirect this request to :1081(glider)
-4. glider finds the ip in office rule, and then choose a forwarder in office.rule to complete the request
+1. client sends http request to the resolved ip of example1.com.
+2. linux gateway server will get the request.
+3. iptables matches the ip in ipset "glider" and redirect this request to :1081(glider)
+4. glider finds the ip in office rule, and then choose a forwarder in office.rule to complete the request.

config/examples/9.transparent_proxy_without_dnsmasq/glider.conf

@@ -9,8 +9,5 @@ listen=redir://:1081
 dns=:53
 dnsserver=8.8.8.8:53
 
-# as a ipset manager
-ipset=glider
-
 # parse all *.rule files in rules.d folder
 rules-dir=rules.d

config/examples/9.transparent_proxy_without_dnsmasq/rules.d/home.rule

@@ -1,18 +1,21 @@
 
 
-forward=http://forwarder4:8080
+forward=http://forwarder1:8080
 
 # first connect forwarder1 then forwarder2 then internet
-forward=http://forwarder5:8080,socks6://forwarder3:1080
+forward=http://forwarder1:8080,socks5://forwarder2:1080
 
 
 # Round Robin mode: rr
 # High Availability mode: ha
 strategy=rr
 
-checkwebsite=www.apple.com
-checkduration=30
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
+checkinterval=30
 
+# as a ipset manager
+ipset=glider
 
 # matches 192.168.0.0/16
 cidr=192.168.0.0/16

config/examples/9.transparent_proxy_without_dnsmasq/rules.d/office.list

@@ -3,5 +3,5 @@ domain=mycompany.com
 domain=mycompany1.com
 ip=4.4.4.4
 ip=5.5.5.5
-cidr=cidr=172.16.101.0/24
-cidr=cidr=172.16.102.0/24
+cidr=172.16.101.0/24
+cidr=172.16.102.0/24

config/examples/9.transparent_proxy_without_dnsmasq/rules.d/office.rule

@@ -9,14 +9,19 @@ forward=http://forwarder2:8080,socks5://forwarder3:1080
 # Round Robin mode: rr
 # High Availability mode: ha
 strategy=rr
-checkwebsite=www.apple.com
-checkduration=30
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
+checkinterval=30
 
 # specify a different dns server(if need)
 dnsserver=208.67.222.222:53
 
+# as a ipset manager
+ipset=glider
+
 # specify destinations
-#include=office.list
+include=office.list
+
 domain=example1.com
 domain=example2.com
 # matches ip

config/glider.conf.example

@@ -32,42 +32,131 @@ verbose=True
 # different protocols.
 
 # listen on 8443, serve as http/socks5 proxy on the same port.
-listen=:8443
+# listen=:8443
+listen=127.0.0.1:8443
 
 # listen on 8448 as a ss server.
 # listen=ss://AEAD_CHACHA20_POLY1305:pass@:8448
 
 # listen on 8080 as a http proxy server.
-listen=http://:8080
+# listen=http://:8080
 
 # listen on 1080 as a socks5 proxy server.
-listen=socks5://:1080
+# listen=socks5://:1080
+
+# listen on 1234 as vless proxy server.
+# listen=vless://uuid@:1234
+# listen on 1234 as vless proxy server, fallback to 127.0.0.1:8080 http server when client auth failed.
+# listen=vless://uuid@:1234?fallback=127.0.0.1:8080
 
 # listen on 1081 as a linux transparent proxy server.
 # listen=redir://:1081
 
-# listen on 1082 as a tcp tunnel, all requests to :1082 will be forward to 1.1.1.1:80
-# listen=tcptun://:1082=1.1.1.1:80
+# listen on 1082 as a linux transparent proxy server(tproxy).
+# listen=tproxy://:1082
 
-# a dnstun is a special dns forwarder server with a fixed remote dns
-# listen on udp port 5353, act as a local dns server, 
-# forward all requests to 8.8.8.8:53 via tcp protocol
-# listen=dnstun://:5353=8.8.8.8:53
+# http over tls (HTTPS proxy)
+# listen=tls://:443?cert=crtFilePath&key=keyFilePath,http://
 
+# ss over tls
+# listen=tls://:443?cert=crtFilePath&key=keyFilePath,ss://AEAD_CHACHA20_POLY1305:pass@
+
+# socks5 over unix domain socket
+# listen=unix:///dev/shm/socket,socks5://
+
+# socks5 over vm socket
+# listen=vsock://:1234,socks5://
+
+# socks5 over kcp
+# listen=kcp://aes:key@127.0.0.1:8444?dataShards=10&parityShards=3&mode=fast,socks5://
+
+# vless server
+# listen=vless://UUID@:1234
+
+# vless over tls server
+# listen=tls://:1234?cert=/path/to/cert&key=/path/to/key,vless://UUID@?fallback=127.0.0.1:80
+
+# vless over ws
+# listen=ws://:1234/path?host=domain.com,vless://707f20ea-d4b8-4d1d-8e2e-2c86cb2ed97a@?fallback=127.0.0.1:80
+
+# trojan server
+# listen=trojan://PASSWORD@:1234?cert=/path/to/cert&key=/path/to/key&fallback=127.0.0.1
+
+# trojanc server (trojan without tls)
+# listen=trojanc://PASSWORD@:1234?fallback=127.0.0.1
 
 # FORWARDERS
 # ----------
 # Forwarders, we can setup multiple forwarders.
+# forward=SCHEME#OPTIONS
+
+# FORWARDER OPTIONS
+# priority: set the priority of that forwarder, default:0
+# interface: set local interface or ip address used to connect remote server
 
 # Socks5 proxy as forwarder
 # forward=socks5://192.168.1.10:1080
 
+# Socks5 proxy as forwarder with priority 100
+# forward=socks5://192.168.1.10:1080#priority=100
+
+# Socks5 proxy as forwarder with priority 100 and use `eth0` as source interface
+# forward=socks5://192.168.1.10:1080#priority=100&interface=eth0
+
+# Socks5 proxy as forwarder with priority 100 and use `192.168.1.100` as source ip
+# forward=socks5://192.168.1.10:1080#priority=100&interface=192.168.1.100
+
 # SS proxy as forwarder
 # forward=ss://method:pass@1.1.1.1:8443
 
+# SSR proxy as forwarder
+# forward=ssr://method:pass@1.1.1.1:8443?protocol=auth_aes128_md5&protocol_param=xxx&obfs=tls1.2_ticket_auth&obfs_param=yyy
+
+# ssh forwarder
+# forward=ssh://user[:pass]@host:port[?key=keypath&timeout=SECONDS]
+# forward=ssh://root:pass@host:port
+# forward=ssh://root@host:port?key=/path/to/keyfile
+# forward=ssh://root@host:port?key=/path/to/keyfile&timeout=5
+
 # http proxy as forwarder
 # forward=http://1.1.1.1:8080
 
+# trojan as forwarder
+# forward=trojan://PASSWORD@1.1.1.1:8080[?serverName=SERVERNAME][&skipVerify=true]
+
+# trojanc as forwarder
+# forward=trojanc://PASSWORD@1.1.1.1:8080
+
+# vless forwarder
+# forward=vless://5a146038-0b56-4e95-b1dc-5c6f5a32cd98@1.1.1.1:443
+
+# vmess with aead auth
+# forward=vmess://5a146038-0b56-4e95-b1dc-5c6f5a32cd98@1.1.1.1:443
+
+# vmess with md5 auth (by setting alterID)
+# forward=vmess://5a146038-0b56-4e95-b1dc-5c6f5a32cd98@1.1.1.1:443?alterID=2
+
+# vmess over tls
+# forward=tls://server.com:443,vmess://5a146038-0b56-4e95-b1dc-5c6f5a32cd98
+
+# vmess over websocket
+# forward=ws://1.1.1.1:80/path?host=server.com,vmess://chacha20-poly1305:5a146038-0b56-4e95-b1dc-5c6f5a32cd98@
+
+# vmess over ws over tls
+# forward=tls://server.com:443,ws://,vmess://5a146038-0b56-4e95-b1dc-5c6f5a32cd98
+# forward=tls://server.com:443,ws://@/path,vmess://5a146038-0b56-4e95-b1dc-5c6f5a32cd98
+
+# ss over tls
+# forward=tls://server.com:443,ss://AEAD_CHACHA20_POLY1305:pass@
+
+# ss over kcp
+# forward=kcp://aes:key@127.0.0.1:8444?dataShards=10&parityShards=3&mode=fast,ss://AEAD_CHACHA20_POLY1305:pass@
+
+# ss with simple-obfs
+# forward=simple-obfs://1.1.1.1:443?type=tls&host=apple.com,ss://AEAD_CHACHA20_POLY1305:pass@
+
+# socks5 over unix domain socket
+# forward=unix:///dev/shm/socket,socks5://
 
 # FORWARDER CHAIN
 # ---------------
@@ -82,49 +171,127 @@ listen=socks5://:1080
 
 # Round Robin mode: rr
 # High Availability mode: ha
+# Latency based High Availability mode: lha
+# Destination Hashing mode: dh
 strategy=rr
 
+# FORWARDER SETTINGS
+# ------------------
+# We can set some parameters for forwarders.
+
+# forwarder will be set to disabled on how many failures counted(both dial and relay).
+maxfailures=3
+
+# timeout for create a connection(seconds)
+# dialtimeout=3
+
+# timeout for relay data from proxy server and client(seconds)
+# DO NOT change it if you don't know what will happen. 
+# relaytimeout=0
+
 
 # FORWARDERS CHECK
 # ----------------
 # We can check whether a forwarder is available.
 
-# Used to connect via forwarders, if the host is unreachable, the forwarder
-# will be set to disabled.
-# MUST be a HTTP website server address, format: HOST[:PORT]. HTTPS NOT SUPPORTED.
-checkwebsite=www.apple.com
+# Forwarder health check:
+# check=tcp[://HOST:PORT]: tcp port connect check
+# check=http://HOST[:PORT][/URI][#expect=REGEX_MATCH_IN_RESP_LINE]
+# check=https://HOST[:PORT][/URI][#expect=REGEX_MATCH_IN_RESP_LINE]
+# e.g. check=https://www.netflix.com/title/81215567#expect=301|404
+# check=file://SCRIPT_PATH: run a check script, healthy when exitcode=0, environment variables: FORWARDER_ADDR,FORWARDER_URL
+# check=disable: disable health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 
-# check duration(seconds)
-checkduration=30
+# check interval(seconds)
+checkinterval=30
 
+# timeout to set a forwarder to be disabled(seconds)
+checktimeout=10
+
+# switch forwarder only when new_latency < old_latency - tolerance, used in lha mode
+checktolerance=100
+
+# use the average latency of the latest N checks
+checklatencysamples=10
+
+# check disabled fowarders only
+checkdisabledonly=false
 
 # DNS FORWARDING SERVER
 # ----------------
-# A dns forwarding server listens on UDP and forward dns requests to remote dns server in TCP via forwarders 
-# we can specify different upstream dns server in rule file for different destinations
+# we can specify different upstream dns server in rule file for different destinations.
 
 # Setup a dns forwarding server
-dns=:53
+# dns=:53
+
 # global remote dns server (you can specify different dns server in rule file)
 dnsserver=8.8.8.8:53
+dnsserver=1.1.1.1:53
 
+# By default, when glider received udp dns request and there's no forwarder specified, 
+# it will use udp to query upstream dns servers, otherwise, use tcp;
+# you can set dnsalwaystcp=true to always use tcp no matter there is a forwarder or not.
+# dnsalwaystcp=false
 
-# IPSET MANAGEMENT
-# ----------------
-# Create and mange ipset on linux based on destinations in rule files
-#   - add ip/cidrs in rule files on startup
-#   - add resolved ips for domains in rule files by dns forwarding server 
-# Usually used in transparent proxy mode on linux
-ipset=glider
+# timeout value used in multiple dnsservers switch(seconds)
+dnstimeout=3
 
+# maximum TTL value for entries in the CACHE(seconds)
+dnsmaxttl=1800
+
+# minimum TTL value for entries in the CACHE(seconds)
+dnsminttl=0
+
+# size of CACHE
+dnscachesize=4096
+
+# show query log of dns cache
+dnscachelog=True
+
+# disable AAAA queries
+# dnsnoaaaa=True
+
+# custom records
+dnsrecord=www.example.com/1.2.3.4
+dnsrecord=www.example.com/2606:2800:220:1:248:1893:25c8:1946
+
+# SERVICES
+# service=dhcpd,INTERFACE,START_IP,END_IP,LEASE_MINUTES[,MAC=IP,MAC=IP...]
+# service=dhcpd-failover,INTERFACE,START_IP,END_IP,LEASE_MINUTES[,MAC=IP,MAC=IP...]
+# e.g.:
+# service=dhcpd,eth1,192.168.1.100,192.168.1.199,720
+# service=dhcpd,eth2,192.168.2.100,192.168.2.199,720,fc:23:34:9e:25:01=192.168.2.101,fc:23:34:9e:25:02=192.168.2.102
+
+# INTERFACE SPECIFIC
+# ------------------
+# Specify global outbound ip/interface.
+# 
+# interface=""
+# interface="192.168.1.100"
+# interface="eth0"
+# 
+# Specify interface for a forwarder:
+# forward=socks5://192.168.1.10:1080#priority=100&interface=eth0
+# forward=socks5://192.168.1.10:1080#priority=100&interface=192.168.1.100
 
 # RULE FILES
 # ----------
-# Specify additional forward rules
-
+# Specify additional forward rules.
+#
 # specify rules folder, so all *.rule files under this folder will be parsed as rule file
-rules-dir=rules.d
-
+# rules-dir=rules.d
+# 
 # specify a rule file
 #rulefile=office.rule
 #rulefile=home.rule
+
+# INCLUDE CONFIG FILES
+# ----------
+#include=dnsrecord.inc.conf
+#include=more.conf
+
+# ENVIRONMENT VARIABLES
+# ----------
+# use {$ENV_VAR_NAME} in VALUE to get the Environment Variable value.
+# forward=socks5://{$USER_NAME}:{$USER_PASS}@:1080

config/rules.d/office.rule.example

@@ -14,15 +14,20 @@ forward=http://192.168.2.1:8080,socks5://192.168.2.2:1080
 strategy=rr
 
 # FORWARDER CHECK SETTINGS
-checkwebsite=www.apple.com
-checkduration=30
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
+checkinterval=30
 
 # DNS SERVER for domains in this rule file
 dnsserver=208.67.222.222:53
 
-# IPSET
-# specify a ipset for destinations in this rule file
-#ipset=office
+# IPSET MANAGEMENT
+# ----------------
+# Create and mange ipset on linux based on destinations in rule files
+#   - add ip/cidrs in rule files on startup
+#   - add resolved ips for domains in rule files by dns forwarding server 
+# Usually used in transparent proxy mode on linux
+# Note: this will create 2 ipsets, glider for ipv4 and glider6 for ipv6
+ipset=glider
 
 # DESTINATIONS
 # ------------
@@ -30,7 +35,7 @@ dnsserver=208.67.222.222:53
 
 # INCLUDE FILE
 # we can include a list file with only destinations settings
-include=office.list.example
+include=office.list
 
 # matches example.com and *.example.com
 domain=example.com

config/rules.d/reject.rule.example

@@ -0,0 +1,7 @@
+
+forward=reject://
+
+ipset=glider
+
+domain=pornhub.com
+domain=amazon.com

conn.go

@@ -1,54 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"io"
-	"net"
-	"time"
-)
-
-type conn struct {
-	r *bufio.Reader
-	net.Conn
-}
-
-func newConn(c net.Conn) conn {
-	return conn{bufio.NewReader(c), c}
-}
-
-func newConnSize(c net.Conn, n int) conn {
-	return conn{bufio.NewReaderSize(c, n), c}
-}
-
-func (c conn) Peek(n int) ([]byte, error) {
-	return c.r.Peek(n)
-}
-
-func (c conn) Read(p []byte) (int, error) {
-	return c.r.Read(p)
-}
-
-func relay(left, right net.Conn) (int64, int64, error) {
-	type res struct {
-		N   int64
-		Err error
-	}
-	ch := make(chan res)
-
-	go func() {
-		n, err := io.Copy(right, left)
-		right.SetDeadline(time.Now()) // wake up the other goroutine blocking on right
-		left.SetDeadline(time.Now())  // wake up the other goroutine blocking on left
-		ch <- res{n, err}
-	}()
-
-	n, err := io.Copy(left, right)
-	right.SetDeadline(time.Now()) // wake up the other goroutine blocking on right
-	left.SetDeadline(time.Now())  // wake up the other goroutine blocking on left
-	rs := <-ch
-
-	if err == nil {
-		err = rs.Err
-	}
-	return n, rs.N, err
-}

dialer.go

@@ -1,52 +0,0 @@
-package main
-
-import (
-	"errors"
-	"net"
-	"net/url"
-)
-
-// A Dialer means to establish a connection and relay it.
-type Dialer interface {
-	// Addr()
-	Addr() string
-
-	// Dial connects to the given address via the proxy.
-	Dial(network, addr string) (c net.Conn, err error)
-
-	// Get the dialer by dstAddr
-	NextDialer(dstAddr string) Dialer
-}
-
-// DialerFromURL parses url and get a Proxy
-// TODO: table
-func DialerFromURL(s string, cDialer Dialer) (Dialer, error) {
-	u, err := url.Parse(s)
-	if err != nil {
-		logf("parse err: %s", err)
-		return nil, err
-	}
-
-	addr := u.Host
-	var user, pass string
-	if u.User != nil {
-		user = u.User.Username()
-		pass, _ = u.User.Password()
-	}
-
-	if cDialer == nil {
-		cDialer = Direct
-	}
-
-	switch u.Scheme {
-	case "http":
-		return NewHTTP(addr, user, pass, cDialer, nil)
-	case "socks5":
-		return NewSOCKS5(addr, user, pass, cDialer, nil)
-	case "ss":
-		p, err := NewSS(addr, user, pass, cDialer, nil)
-		return p, err
-	}
-
-	return nil, errors.New("unknown schema '" + u.Scheme + "'")
-}

direct.go

@@ -1,22 +0,0 @@
-package main
-
-import "net"
-
-// direct proxy
-type direct struct {
-}
-
-// Direct proxy
-var Direct = &direct{}
-
-func (d *direct) Addr() string { return "DIRECT" }
-
-func (d *direct) Dial(network, addr string) (net.Conn, error) {
-	c, err := net.Dial(network, addr)
-	if c, ok := c.(*net.TCPConn); ok {
-		c.SetKeepAlive(true)
-	}
-	return c, err
-}
-
-func (d *direct) NextDialer(dstAddr string) Dialer { return d }

dns.go

@@ -1,252 +0,0 @@
-// https://tools.ietf.org/html/rfc1035
-
-package main
-
-import (
-	"encoding/binary"
-	"io"
-	"net"
-	"strings"
-)
-
-// DNSUDPHeaderLen is the length of UDP dns msg header
-const DNSUDPHeaderLen = 12
-
-// DNSTCPHeaderLen is the length of TCP dns msg header
-const DNSTCPHeaderLen = 2 + DNSUDPHeaderLen
-
-// DNSUDPMaxLen is the max size of udp dns request.
-// https://tools.ietf.org/html/rfc1035#section-4.2.1
-// Messages carried by UDP are restricted to 512 bytes (not counting the IP
-// or UDP headers).  Longer messages are truncated and the TC bit is set in
-// the header.
-// TODO: If the request length > 512 then the client will send TCP packets instead,
-// so we should also serve tcp requests.
-const DNSUDPMaxLen = 512
-
-// DNSQueryTypeA ipv4
-const DNSQueryTypeA = 1
-
-// DNSQueryTypeAAAA ipv6
-const DNSQueryTypeAAAA = 28
-
-type dnsQuery struct {
-	DomainName string
-	QueryType  uint16
-	QueryClass uint16
-	Offset     int
-}
-
-type dnsAnswer struct {
-	// DomainName string
-	QueryType  uint16
-	QueryClass uint16
-	TTL        uint32
-	DataLength uint16
-	Data       []byte
-
-	IP string
-}
-
-// DNSAnswerHandler .
-type DNSAnswerHandler func(domain, ip string) error
-
-// DNS .
-type DNS struct {
-	*Forwarder        // as proxy client
-	sDialer    Dialer // dialer for server
-
-	dnsServer string
-
-	dnsServerMap   map[string]string
-	answerHandlers []DNSAnswerHandler
-}
-
-// NewDNS returns a dns forwarder. client[dns.udp] -> glider[tcp] -> forwarder[dns.tcp] -> remote dns addr
-func NewDNS(addr, raddr string, sDialer Dialer) (*DNS, error) {
-	s := &DNS{
-		Forwarder: NewForwarder(addr, nil),
-		sDialer:   sDialer,
-
-		dnsServer:    raddr,
-		dnsServerMap: make(map[string]string),
-	}
-
-	return s, nil
-}
-
-// ListenAndServe .
-func (s *DNS) ListenAndServe() {
-	c, err := net.ListenPacket("udp", s.addr)
-	if err != nil {
-		logf("failed to listen on %s: %v", s.addr, err)
-		return
-	}
-	defer c.Close()
-
-	logf("listening UDP on %s", s.addr)
-
-	for {
-		data := make([]byte, DNSUDPMaxLen)
-
-		n, clientAddr, err := c.ReadFrom(data)
-		if err != nil {
-			logf("DNS local read error: %v", err)
-			continue
-		}
-
-		data = data[:n]
-
-		go func() {
-			query := parseQuery(data)
-			domain := query.DomainName
-
-			dnsServer := s.GetServer(domain)
-
-			rc, err := s.sDialer.NextDialer(domain+":53").Dial("tcp", dnsServer)
-			if err != nil {
-				logf("failed to connect to server %v: %v", dnsServer, err)
-				return
-			}
-			defer rc.Close()
-
-			// 2 bytes length after tcp header, before dns message
-			reqLen := make([]byte, 2)
-			binary.BigEndian.PutUint16(reqLen, uint16(len(data)))
-			rc.Write(reqLen)
-			rc.Write(data)
-
-			// fmt.Printf("dns req len %d:\n%s\n\n", reqLen, hex.Dump(data[:]))
-
-			var respLen uint16
-			err = binary.Read(rc, binary.BigEndian, &respLen)
-			if err != nil {
-				logf("proxy-dns: error in read respLen %s\n", err)
-				return
-			}
-
-			respMsg := make([]byte, respLen)
-			_, err = io.ReadFull(rc, respMsg)
-			if err != nil {
-				logf("proxy-dns: error in read respMsg %s\n", err)
-				return
-			}
-
-			// fmt.Printf("dns resp len %d:\n%s\n\n", respLen, hex.Dump(respMsg[:]))
-
-			var ip string
-			// length is not needed in udp dns response. (2 bytes)
-			// SEE RFC1035, section 4.2.2 TCP: The message is prefixed with a two byte length field which gives the message length, excluding the two byte length field.
-			if respLen > 0 {
-				query := parseQuery(respMsg)
-				if len(respMsg) > query.Offset {
-					answers := parseAnswers(respMsg[query.Offset:])
-					for _, answer := range answers {
-						if answer.IP != "" {
-							ip += answer.IP + ","
-						}
-
-						for _, h := range s.answerHandlers {
-							h(query.DomainName, answer.IP)
-						}
-
-					}
-
-				}
-
-				_, err = c.WriteTo(respMsg, clientAddr)
-				if err != nil {
-					logf("error in local write: %s\n", err)
-				}
-			}
-
-			logf("proxy-dns %s <-> %s, %s: %s", clientAddr.String(), dnsServer, domain, ip)
-
-		}()
-	}
-}
-
-// SetServer .
-func (s *DNS) SetServer(domain, server string) {
-	s.dnsServerMap[domain] = server
-}
-
-// GetServer .
-func (s *DNS) GetServer(domain string) string {
-
-	domainParts := strings.Split(domain, ".")
-	length := len(domainParts)
-	for i := length - 2; i >= 0; i-- {
-		domain := strings.Join(domainParts[i:length], ".")
-
-		if server, ok := s.dnsServerMap[domain]; ok {
-			return server
-		}
-	}
-
-	return s.dnsServer
-}
-
-// AddAnswerHandler .
-func (s *DNS) AddAnswerHandler(h DNSAnswerHandler) {
-	s.answerHandlers = append(s.answerHandlers, h)
-}
-
-func parseQuery(p []byte) *dnsQuery {
-	q := &dnsQuery{}
-
-	var i int
-	var domain []byte
-	for i = DNSUDPHeaderLen; i < len(p); {
-		l := int(p[i])
-
-		if l == 0 {
-			i++
-			break
-		}
-
-		domain = append(domain, p[i+1:i+l+1]...)
-		domain = append(domain, '.')
-
-		i = i + l + 1
-	}
-
-	q.DomainName = string(domain[:len(domain)-1])
-	q.QueryType = binary.BigEndian.Uint16(p[i:])
-	q.QueryClass = binary.BigEndian.Uint16(p[i+2:])
-	q.Offset = i + 4
-
-	return q
-}
-
-func parseAnswers(p []byte) []*dnsAnswer {
-	var answers []*dnsAnswer
-
-	for i := 0; i < len(p); {
-		l := int(p[i])
-
-		if l == 0 {
-			i++
-			break
-		}
-
-		answer := &dnsAnswer{}
-		answer.QueryType = binary.BigEndian.Uint16(p[i+2:])
-		answer.QueryClass = binary.BigEndian.Uint16(p[i+4:])
-		answer.TTL = binary.BigEndian.Uint32(p[i+6:])
-		answer.DataLength = binary.BigEndian.Uint16(p[i+10:])
-		answer.Data = p[i+12 : i+12+int(answer.DataLength)]
-
-		if answer.QueryType == DNSQueryTypeA {
-			answer.IP = net.IP(answer.Data[:net.IPv4len]).String()
-		} else if answer.QueryType == DNSQueryTypeAAAA {
-			answer.IP = net.IP(answer.Data[:net.IPv6len]).String()
-		}
-
-		answers = append(answers, answer)
-
-		i = i + 12 + int(answer.DataLength)
-	}
-
-	return answers
-}

dns/cache.go

@@ -0,0 +1,127 @@
+package dns
+
+import (
+	"sync"
+	"time"
+)
+
+// LruCache is the struct of LruCache.
+type LruCache struct {
+	mu    sync.Mutex
+	size  int
+	head  *item
+	tail  *item
+	cache map[string]*item
+	store map[string][]byte
+}
+
+// item is the struct of cache item.
+type item struct {
+	key  string
+	val  []byte
+	exp  int64
+	prev *item
+	next *item
+}
+
+// NewLruCache returns a new LruCache.
+func NewLruCache(size int) *LruCache {
+	// init 2 items here, it doesn't matter cuz they will be deleted when the cache is full
+	head, tail := &item{key: "head"}, &item{key: "tail"}
+	head.next, tail.prev = tail, head
+	c := &LruCache{
+		size:  size,
+		head:  head,
+		tail:  tail,
+		cache: make(map[string]*item, size),
+		store: make(map[string][]byte),
+	}
+	c.cache[head.key], c.cache[tail.key] = head, tail
+	return c
+}
+
+// Get gets an item from cache.
+func (c *LruCache) Get(k string) (v []byte, expired bool) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	if v, ok := c.store[k]; ok {
+		return v, false
+	}
+
+	if it, ok := c.cache[k]; ok {
+		v = it.val
+		if it.exp < time.Now().Unix() {
+			expired = true
+		}
+		c.moveToHead(it)
+	}
+	return
+}
+
+// Set sets an item with key, value, and ttl(seconds).
+// if the ttl is zero, this item will be set and never be deleted.
+// if the key exists, update it with value and exp and move it to head.
+// if the key does not exist, put a new item to the cache's head.
+// finally, remove the tail if the cache is full.
+func (c *LruCache) Set(k string, v []byte, ttl int) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	if ttl == 0 {
+		c.store[k] = v
+		return
+	}
+
+	exp := time.Now().Add(time.Second * time.Duration(ttl)).Unix()
+	if it, ok := c.cache[k]; ok {
+		it.val = v
+		it.exp = exp
+		c.moveToHead(it)
+		return
+	}
+
+	c.putToHead(k, v, exp)
+
+	// NOTE: the cache size will always >= 2,
+	// but it doesn't matter in our environment.
+	if len(c.cache) > c.size {
+		c.removeTail()
+	}
+}
+
+// putToHead puts a new item to cache's head.
+func (c *LruCache) putToHead(k string, v []byte, exp int64) {
+	it := &item{key: k, val: v, exp: exp, prev: nil, next: c.head}
+	it.prev = nil
+	it.next = c.head
+	c.head.prev = it
+	c.head = it
+
+	c.cache[k] = it
+}
+
+// moveToHead moves an existing item to cache's head.
+func (c *LruCache) moveToHead(it *item) {
+	if it != c.head {
+		if c.tail == it {
+			c.tail = it.prev
+			c.tail.next = nil
+		} else {
+			it.prev.next = it.next
+			it.next.prev = it.prev
+		}
+		it.prev = nil
+		it.next = c.head
+		c.head.prev = it
+		c.head = it
+	}
+}
+
+// removeTail removes the tail from cache.
+func (c *LruCache) removeTail() {
+	delete(c.cache, c.tail.key)
+
+	c.tail.prev.next = nil
+	c.tail = c.tail.prev
+}

dns/client.go

@@ -0,0 +1,344 @@
+package dns
+
+import (
+	"encoding/binary"
+	"errors"
+	"io"
+	"net"
+	"net/netip"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/proxy"
+)
+
+// AnswerHandler function handles the dns TypeA or TypeAAAA answer.
+type AnswerHandler func(domain string, ip netip.Addr) error
+
+// Config for dns.
+type Config struct {
+	Servers   []string
+	Timeout   int
+	MaxTTL    int
+	MinTTL    int
+	Records   []string
+	AlwaysTCP bool
+	CacheSize int
+	CacheLog  bool
+	NoAAAA    bool
+}
+
+// Client is a dns client struct.
+type Client struct {
+	proxy       proxy.Proxy
+	cache       *LruCache
+	config      *Config
+	upStream    *UPStream
+	upStreamMap map[string]*UPStream
+	handlers    []AnswerHandler
+}
+
+// NewClient returns a new dns client.
+func NewClient(proxy proxy.Proxy, config *Config) (*Client, error) {
+	c := &Client{
+		proxy:       proxy,
+		cache:       NewLruCache(config.CacheSize),
+		config:      config,
+		upStream:    NewUPStream(config.Servers),
+		upStreamMap: make(map[string]*UPStream),
+	}
+
+	// custom records
+	for _, record := range config.Records {
+		if err := c.AddRecord(record); err != nil {
+			log.F("[dns] add record '%s' error: %s", record, err)
+		}
+	}
+
+	return c, nil
+}
+
+// Exchange handles request message and returns response message.
+// TODO: optimize it
+func (c *Client) Exchange(reqBytes []byte, clientAddr string, preferTCP bool) ([]byte, error) {
+	req, err := UnmarshalMessage(reqBytes)
+	if err != nil {
+		return nil, err
+	}
+
+	if c.config.NoAAAA && req.Question.QTYPE == QTypeAAAA {
+		respBytes := valCopy(reqBytes)
+		respBytes[2] |= uint8(ResponseMsg) << 7
+		return respBytes, nil
+	}
+
+	if req.Question.QTYPE == QTypeA || req.Question.QTYPE == QTypeAAAA {
+		if v, expired := c.cache.Get(qKey(req.Question)); len(v) > 2 {
+			v = valCopy(v)
+			binary.BigEndian.PutUint16(v[:2], req.ID)
+
+			if c.config.CacheLog {
+				log.F("[dns] %s <-> cache, type: %d, %s",
+					clientAddr, req.Question.QTYPE, req.Question.QNAME)
+			}
+
+			if expired { // update cache
+				go func(qname string, reqBytes []byte, preferTCP bool) {
+					defer pool.PutBuffer(reqBytes)
+					if dnsServer, network, dialerAddr, respBytes, err := c.exchange(qname, reqBytes, preferTCP); err == nil {
+						c.handleAnswer(respBytes, "cache", dnsServer, network, dialerAddr)
+					}
+				}(req.Question.QNAME, valCopy(reqBytes), preferTCP)
+			}
+			return v, nil
+		}
+	}
+
+	dnsServer, network, dialerAddr, respBytes, err := c.exchange(req.Question.QNAME, reqBytes, preferTCP)
+	if err != nil {
+		return nil, err
+	}
+
+	if req.Question.QTYPE != QTypeA && req.Question.QTYPE != QTypeAAAA {
+		log.F("[dns] %s <-> %s(%s) via %s, type: %d, %s",
+			clientAddr, dnsServer, network, dialerAddr, req.Question.QTYPE, req.Question.QNAME)
+		return respBytes, nil
+	}
+
+	err = c.handleAnswer(respBytes, clientAddr, dnsServer, network, dialerAddr)
+	return respBytes, err
+}
+
+func (c *Client) handleAnswer(respBytes []byte, clientAddr, dnsServer, network, dialerAddr string) error {
+	resp, err := UnmarshalMessage(respBytes)
+	if err != nil {
+		return err
+	}
+
+	ips, ttl := c.extractAnswer(resp)
+	if ttl > c.config.MaxTTL {
+		ttl = c.config.MaxTTL
+	} else if ttl < c.config.MinTTL {
+		ttl = c.config.MinTTL
+	}
+
+	if ttl <= 0 { // we got a null result
+		ttl = 1800
+	}
+
+	c.cache.Set(qKey(resp.Question), valCopy(respBytes), ttl)
+	log.F("[dns] %s <-> %s(%s) via %s, %s/%d: %s, ttl: %ds",
+		clientAddr, dnsServer, network, dialerAddr, resp.Question.QNAME, resp.Question.QTYPE, strings.Join(ips, ","), ttl)
+
+	return nil
+}
+
+func (c *Client) extractAnswer(resp *Message) ([]string, int) {
+	var ips []string
+	ttl := c.config.MinTTL
+	for _, answer := range resp.Answers {
+		if answer.TYPE == QTypeA || answer.TYPE == QTypeAAAA {
+			if answer.IP.IsValid() && !answer.IP.IsUnspecified() {
+				for _, h := range c.handlers {
+					h(resp.Question.QNAME, answer.IP)
+				}
+				ips = append(ips, answer.IP.String())
+			}
+			if answer.TTL != 0 {
+				ttl = int(answer.TTL)
+			}
+		}
+	}
+
+	return ips, ttl
+}
+
+// exchange choose a upstream dns server based on qname, communicate with it on the network.
+func (c *Client) exchange(qname string, reqBytes []byte, preferTCP bool) (
+	server, network, dialerAddr string, respBytes []byte, err error) {
+
+	// use tcp to connect upstream server default
+	network = "tcp"
+	dialer := c.proxy.NextDialer(qname + ":0")
+
+	// if we are resolving a domain which uses a forwarder `REJECT`, then use `DIRECT` instead
+	// so we can resolve it correctly.
+	// TODO: dialer.Addr() == "REJECT", tricky
+	if dialer.Addr() == "REJECT" {
+		dialer = c.proxy.NextDialer("direct:0")
+	}
+
+	// If client uses udp and no forwarders specified, use udp
+	// TODO: dialer.Addr() == "DIRECT", tricky
+	if !preferTCP && !c.config.AlwaysTCP && dialer.Addr() == "DIRECT" {
+		network = "udp"
+	}
+
+	ups := c.UpStream(qname)
+	server = ups.Server()
+	for range ups.Len() {
+		var rc net.Conn
+		rc, err = dialer.Dial(network, server)
+		if err != nil {
+			newServer := ups.SwitchIf(server)
+			log.F("[dns] error in resolving %s, failed to connect to server %v via %s: %v, next server: %s",
+				qname, server, dialer.Addr(), err, newServer)
+			server = newServer
+			continue
+		}
+		defer rc.Close()
+
+		// TODO: support timeout setting for different upstream server
+		if c.config.Timeout > 0 {
+			rc.SetDeadline(time.Now().Add(time.Duration(c.config.Timeout) * time.Second))
+		}
+
+		switch network {
+		case "tcp":
+			respBytes, err = c.exchangeTCP(rc, reqBytes)
+		case "udp":
+			respBytes, err = c.exchangeUDP(rc, reqBytes)
+		}
+
+		if err == nil {
+			break
+		}
+
+		newServer := ups.SwitchIf(server)
+		log.F("[dns] error in resolving %s, failed to exchange with server %v via %s: %v, next server: %s",
+			qname, server, dialer.Addr(), err, newServer)
+
+		server = newServer
+	}
+
+	// if all dns upstreams failed, then maybe the forwarder is not available.
+	if err != nil {
+		c.proxy.Record(dialer, false)
+	}
+
+	return server, network, dialer.Addr(), respBytes, err
+}
+
+// exchangeTCP exchange with server over tcp.
+func (c *Client) exchangeTCP(rc net.Conn, reqBytes []byte) ([]byte, error) {
+	lenBuf := pool.GetBuffer(2)
+	defer pool.PutBuffer(lenBuf)
+
+	binary.BigEndian.PutUint16(lenBuf, uint16(len(reqBytes)))
+	if _, err := (&net.Buffers{lenBuf, reqBytes}).WriteTo(rc); err != nil {
+		return nil, err
+	}
+
+	var respLen uint16
+	if err := binary.Read(rc, binary.BigEndian, &respLen); err != nil {
+		return nil, err
+	}
+
+	respBytes := pool.GetBuffer(int(respLen))
+	_, err := io.ReadFull(rc, respBytes)
+	if err != nil {
+		return nil, err
+	}
+
+	return respBytes, nil
+}
+
+// exchangeUDP exchange with server over udp.
+func (c *Client) exchangeUDP(rc net.Conn, reqBytes []byte) ([]byte, error) {
+	if _, err := rc.Write(reqBytes); err != nil {
+		return nil, err
+	}
+
+	respBytes := pool.GetBuffer(UDPMaxLen)
+	n, err := rc.Read(respBytes)
+	if err != nil {
+		return nil, err
+	}
+
+	return respBytes[:n], nil
+}
+
+// SetServers sets upstream dns servers for the given domain.
+func (c *Client) SetServers(domain string, servers []string) {
+	c.upStreamMap[strings.ToLower(domain)] = NewUPStream(servers)
+}
+
+// UpStream returns upstream dns server for the given domain.
+func (c *Client) UpStream(domain string) *UPStream {
+	domain = strings.ToLower(domain)
+	for i := len(domain); i != -1; {
+		i = strings.LastIndexByte(domain[:i], '.')
+		if upstream, ok := c.upStreamMap[domain[i+1:]]; ok {
+			return upstream
+		}
+	}
+	return c.upStream
+}
+
+// AddHandler adds a custom handler to handle the resolved result (A and AAAA).
+func (c *Client) AddHandler(h AnswerHandler) {
+	c.handlers = append(c.handlers, h)
+}
+
+// AddRecord adds custom record to dns cache, format:
+// www.example.com/1.2.3.4 or www.example.com/2606:2800:220:1:248:1893:25c8:1946
+func (c *Client) AddRecord(record string) error {
+	domain, ip, found := strings.Cut(record, "/")
+	if !found {
+		return errors.New("wrong record format, must contain '/'")
+	}
+	m, err := MakeResponse(domain, ip, uint32(c.config.MaxTTL))
+	if err != nil {
+		log.F("[dns] add custom record error: %s", err)
+		return err
+	}
+
+	wb := pool.GetBytesBuffer()
+	defer pool.PutBytesBuffer(wb)
+
+	_, err = m.MarshalTo(wb)
+	if err != nil {
+		return err
+	}
+
+	c.cache.Set(qKey(m.Question), valCopy(wb.Bytes()), 0)
+
+	return nil
+}
+
+// MakeResponse makes a dns response message for the given domain and ip address.
+// Note: you should make sure ttl > 0.
+func MakeResponse(domain, ip string, ttl uint32) (*Message, error) {
+	addr, err := netip.ParseAddr(ip)
+	if err != nil {
+		return nil, err
+	}
+
+	var qtype, rdlen uint16 = QTypeA, net.IPv4len
+	if addr.Is6() {
+		qtype, rdlen = QTypeAAAA, net.IPv6len
+	}
+
+	m := NewMessage(0, ResponseMsg)
+	m.SetQuestion(NewQuestion(qtype, domain))
+	rr := &RR{NAME: domain, TYPE: qtype, CLASS: ClassINET,
+		TTL: ttl, RDLENGTH: rdlen, RDATA: addr.AsSlice()}
+	m.AddAnswer(rr)
+
+	return m, nil
+}
+
+func qKey(q *Question) string {
+	return q.QNAME + "/" + strconv.FormatUint(uint64(q.QTYPE), 10)
+}
+
+func valCopy(v []byte) (b []byte) {
+	if v != nil {
+		b = pool.GetBuffer(len(v))
+		copy(b, v)
+	}
+	return
+}

dns/message.go

@@ -0,0 +1,527 @@
+package dns
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+	"math/rand/v2"
+	"net/netip"
+	"strings"
+)
+
+// UDPMaxLen is the max size of udp dns request.
+// https://www.dnsflagday.net/2020/
+const UDPMaxLen = 1232
+
+// HeaderLen is the length of dns msg header.
+const HeaderLen = 12
+
+// MsgType is the dns Message type.
+type MsgType byte
+
+// Message types.
+const (
+	QueryMsg    MsgType = 0
+	ResponseMsg MsgType = 1
+)
+
+// Query types.
+const (
+	QTypeA    uint16 = 1  //ipv4
+	QTypeAAAA uint16 = 28 ///ipv6
+)
+
+// ClassINET .
+const ClassINET uint16 = 1
+
+// Message format:
+// https://www.rfc-editor.org/rfc/rfc1035#section-4.1
+// All communications inside of the domain protocol are carried in a single
+// format called a message.  The top level format of message is divided
+// into 5 sections (some of which are empty in certain cases) shown below:
+//
+//	+---------------------+
+//	|        Header       |
+//	+---------------------+
+//	|       Question      | the question for the name server
+//	+---------------------+
+//	|        Answer       | RRs answering the question
+//	+---------------------+
+//	|      Authority      | RRs pointing toward an authority
+//	+---------------------+
+//	|      Additional     | RRs holding additional information
+type Message struct {
+	Header
+	// most dns implementation only support 1 question
+	Question   *Question
+	Answers    []*RR
+	Authority  []*RR
+	Additional []*RR
+
+	// used in UnmarshalMessage
+	unMarshaled []byte
+}
+
+// NewMessage returns a new message.
+func NewMessage(id uint16, msgType MsgType) *Message {
+	if id == 0 {
+		id = uint16(rand.Uint32())
+	}
+
+	m := &Message{Header: Header{ID: id}}
+	m.SetMsgType(msgType)
+
+	return m
+}
+
+// SetQuestion sets a question to dns message.
+func (m *Message) SetQuestion(q *Question) error {
+	m.Question = q
+	m.Header.SetQdcount(1)
+	return nil
+}
+
+// AddAnswer adds an answer to dns message.
+func (m *Message) AddAnswer(rr *RR) error {
+	m.Answers = append(m.Answers, rr)
+	return nil
+}
+
+// Marshal marshals message struct to []byte.
+func (m *Message) Marshal() ([]byte, error) {
+	buf := &bytes.Buffer{}
+	if _, err := m.MarshalTo(buf); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+// MarshalTo marshals message struct to []byte and write to w.
+func (m *Message) MarshalTo(w io.Writer) (n int, err error) {
+	m.Header.SetQdcount(1)
+	m.Header.SetAncount(len(m.Answers))
+
+	nn := 0
+	nn, err = m.Header.MarshalTo(w)
+	if err != nil {
+		return
+	}
+	n += nn
+
+	nn, err = m.Question.MarshalTo(w)
+	if err != nil {
+		return
+	}
+	n += nn
+
+	for _, answer := range m.Answers {
+		nn, err = answer.MarshalTo(w)
+		if err != nil {
+			return
+		}
+		n += nn
+	}
+
+	return
+}
+
+// UnmarshalMessage unmarshals []bytes to Message.
+func UnmarshalMessage(b []byte) (*Message, error) {
+	if len(b) < HeaderLen {
+		return nil, errors.New("UnmarshalMessage: not enough data")
+	}
+
+	m := &Message{unMarshaled: b}
+	if err := UnmarshalHeader(b[:HeaderLen], &m.Header); err != nil {
+		return nil, err
+	}
+
+	q := &Question{}
+	qLen, err := m.UnmarshalQuestion(b[HeaderLen:], q)
+	if err != nil {
+		return nil, err
+	}
+	m.SetQuestion(q)
+
+	// resp answers
+	rrIdx := HeaderLen + qLen
+	for range int(m.Header.ANCOUNT) {
+		rr := &RR{}
+		rrLen, err := m.UnmarshalRR(rrIdx, rr)
+		if err != nil {
+			return nil, err
+		}
+		m.AddAnswer(rr)
+
+		rrIdx += rrLen
+	}
+
+	m.Header.SetAncount(len(m.Answers))
+
+	return m, nil
+}
+
+// Header format:
+// https://www.rfc-editor.org/rfc/rfc1035#section-4.1.1
+// The header contains the following fields:
+//
+//	                                1  1  1  1  1  1
+//	  0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                      ID                       |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|QR|   Opcode  |AA|TC|RD|RA|   Z    |   RCODE   |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                    QDCOUNT                    |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                    ANCOUNT                    |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                    NSCOUNT                    |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                    ARCOUNT                    |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+type Header struct {
+	ID      uint16
+	Bits    uint16
+	QDCOUNT uint16
+	ANCOUNT uint16
+	NSCOUNT uint16
+	ARCOUNT uint16
+}
+
+// SetMsgType sets the message type.
+func (h *Header) SetMsgType(qr MsgType) {
+	h.Bits |= uint16(qr) << 15
+}
+
+// SetTC sets the tc flag.
+func (h *Header) SetTC(tc int) {
+	h.Bits |= uint16(tc) << 9
+}
+
+// SetQdcount sets query count, most dns servers only support 1 query per request.
+func (h *Header) SetQdcount(qdcount int) {
+	h.QDCOUNT = uint16(qdcount)
+}
+
+// SetAncount sets answers count.
+func (h *Header) SetAncount(ancount int) {
+	h.ANCOUNT = uint16(ancount)
+}
+
+// Not used now, but keep it for future use.
+// func (h *Header) setFlag(QR uint16, Opcode uint16, AA uint16,
+// 	TC uint16, RD uint16, RA uint16, RCODE uint16) {
+// 	h.Bits = QR<<15 + Opcode<<11 + AA<<10 + TC<<9 + RD<<8 + RA<<7 + RCODE
+// }
+
+// MarshalTo marshals header struct to []byte and write to w.
+func (h *Header) MarshalTo(w io.Writer) (int, error) {
+	return HeaderLen, binary.Write(w, binary.BigEndian, h)
+}
+
+// UnmarshalHeader unmarshals []bytes to Header.
+func UnmarshalHeader(b []byte, h *Header) error {
+	if h == nil {
+		return errors.New("unmarshal header must not be nil")
+	}
+
+	if len(b) != HeaderLen {
+		return errors.New("unmarshal header bytes has an unexpected size")
+	}
+
+	h.ID = binary.BigEndian.Uint16(b[:2])
+	h.Bits = binary.BigEndian.Uint16(b[2:4])
+	h.QDCOUNT = binary.BigEndian.Uint16(b[4:6])
+	h.ANCOUNT = binary.BigEndian.Uint16(b[6:8])
+	h.NSCOUNT = binary.BigEndian.Uint16(b[8:10])
+	h.ARCOUNT = binary.BigEndian.Uint16(b[10:])
+
+	return nil
+}
+
+// Question format:
+// https://www.rfc-editor.org/rfc/rfc1035#section-4.1.2
+// The question section is used to carry the "question" in most queries,
+// i.e., the parameters that define what is being asked.  The section
+// contains QDCOUNT (usually 1) entries, each of the following format:
+//
+//	                                1  1  1  1  1  1
+//	  0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                                               |
+//	/                     QNAME                     /
+//	/                                               /
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                     QTYPE                     |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                     QCLASS                    |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+type Question struct {
+	QNAME  string
+	QTYPE  uint16
+	QCLASS uint16
+}
+
+// NewQuestion returns a new dns question.
+func NewQuestion(qtype uint16, domain string) *Question {
+	return &Question{
+		QNAME:  domain,
+		QTYPE:  qtype,
+		QCLASS: ClassINET,
+	}
+}
+
+// MarshalTo marshals Question struct to []byte and write to w.
+func (q *Question) MarshalTo(w io.Writer) (n int, err error) {
+	n, err = MarshalDomainTo(w, q.QNAME)
+	if err != nil {
+		return
+	}
+
+	if err = binary.Write(w, binary.BigEndian, q.QTYPE); err != nil {
+		return
+	}
+	n += 2
+
+	if err = binary.Write(w, binary.BigEndian, q.QCLASS); err != nil {
+		return
+	}
+	n += 2
+
+	return
+}
+
+// UnmarshalQuestion unmarshals []bytes to Question.
+func (m *Message) UnmarshalQuestion(b []byte, q *Question) (n int, err error) {
+	if q == nil {
+		return 0, errors.New("unmarshal question must not be nil")
+	}
+
+	if len(b) <= 5 {
+		return 0, errors.New("UnmarshalQuestion: not enough data")
+	}
+
+	sb := new(strings.Builder)
+	sb.Grow(32)
+	idx, err := m.UnmarshalDomainTo(sb, b)
+	if err != nil {
+		return 0, err
+	}
+
+	q.QNAME = sb.String()
+	q.QTYPE = binary.BigEndian.Uint16(b[idx : idx+2])
+	q.QCLASS = binary.BigEndian.Uint16(b[idx+2 : idx+4])
+
+	return idx + 3 + 1, nil
+}
+
+// RR format:
+// https://www.rfc-editor.org/rfc/rfc1035#section-3.2.1
+// https://www.rfc-editor.org/rfc/rfc1035#section-4.1.3
+// The answer, authority, and additional sections all share the same
+// format: a variable number of resource records, where the number of
+// records is specified in the corresponding count field in the header.
+// Each resource record has the following format:
+//
+//	                                1  1  1  1  1  1
+//	  0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                                               |
+//	/                                               /
+//	/                      NAME                     /
+//	|                                               |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                      TYPE                     |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                     CLASS                     |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                      TTL                      |
+//	|                                               |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	|                   RDLENGTH                    |
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
+//	/                     RDATA                     /
+//	/                                               /
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+type RR struct {
+	NAME     string
+	TYPE     uint16
+	CLASS    uint16
+	TTL      uint32
+	RDLENGTH uint16
+	RDATA    []byte
+
+	IP netip.Addr
+}
+
+// NewRR returns a new dns rr.
+func NewRR() *RR {
+	return &RR{}
+}
+
+// MarshalTo marshals RR struct to []byte and write to w.
+func (rr *RR) MarshalTo(w io.Writer) (n int, err error) {
+	n, err = MarshalDomainTo(w, rr.NAME)
+	if err != nil {
+		return
+	}
+
+	if err = binary.Write(w, binary.BigEndian, rr.TYPE); err != nil {
+		return
+	}
+	n += 2
+
+	if err = binary.Write(w, binary.BigEndian, rr.CLASS); err != nil {
+		return
+	}
+	n += 2
+
+	if err = binary.Write(w, binary.BigEndian, rr.TTL); err != nil {
+		return
+	}
+	n += 4
+
+	err = binary.Write(w, binary.BigEndian, rr.RDLENGTH)
+	if err != nil {
+		return
+	}
+	n += 2
+
+	if _, err = w.Write(rr.RDATA); err != nil {
+		return
+	}
+	n += len(rr.RDATA)
+
+	return
+}
+
+// UnmarshalRR unmarshals []bytes to RR.
+func (m *Message) UnmarshalRR(start int, rr *RR) (n int, err error) {
+	if rr == nil {
+		return 0, errors.New("unmarshal rr must not be nil")
+	}
+
+	p := m.unMarshaled[start:]
+
+	sb := new(strings.Builder)
+	sb.Grow(32)
+
+	n, err = m.UnmarshalDomainTo(sb, p)
+	if err != nil {
+		return 0, err
+	}
+	rr.NAME = sb.String()
+
+	if len(p) <= n+10 {
+		return 0, errors.New("UnmarshalRR: not enough data")
+	}
+
+	rr.TYPE = binary.BigEndian.Uint16(p[n:])
+	rr.CLASS = binary.BigEndian.Uint16(p[n+2:])
+	rr.TTL = binary.BigEndian.Uint32(p[n+4:])
+	rr.RDLENGTH = binary.BigEndian.Uint16(p[n+8:])
+
+	if len(p) < n+10+int(rr.RDLENGTH) {
+		return 0, errors.New("UnmarshalRR: not enough data for RDATA")
+	}
+
+	rr.RDATA = p[n+10 : n+10+int(rr.RDLENGTH)]
+
+	if rr.TYPE == QTypeA {
+		rr.IP = netip.AddrFrom4(*(*[4]byte)(rr.RDATA[:4]))
+	} else if rr.TYPE == QTypeAAAA {
+		rr.IP = netip.AddrFrom16(*(*[16]byte)(rr.RDATA[:16]))
+	}
+
+	n = n + 10 + int(rr.RDLENGTH)
+
+	return n, nil
+}
+
+// MarshalDomainTo marshals domain string struct to []byte and write to w.
+func MarshalDomainTo(w io.Writer, domain string) (n int, err error) {
+	nn := 0
+	for _, seg := range strings.Split(domain, ".") {
+		nn, err = w.Write([]byte{byte(len(seg))})
+		if err != nil {
+			return
+		}
+		n += nn
+
+		nn, err = io.WriteString(w, seg)
+		if err != nil {
+			return
+		}
+		n += nn
+	}
+
+	nn, err = w.Write([]byte{0x00})
+	if err != nil {
+		return
+	}
+	n += nn
+
+	return
+}
+
+// UnmarshalDomainTo gets domain from bytes to string builder.
+func (m *Message) UnmarshalDomainTo(sb *strings.Builder, b []byte) (int, error) {
+	var idx, size int
+
+	for len(b[idx:]) != 0 {
+		// https://www.rfc-editor.org/rfc/rfc1035#section-4.1.4
+		// "Message compression",
+		// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+		// | 1  1|                OFFSET                   |
+		// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+		if b[idx]&0xC0 == 0xC0 {
+			if len(b[idx:]) < 2 {
+				return 0, errors.New("UnmarshalDomainTo: not enough size for compressed domain")
+			}
+
+			offset := binary.BigEndian.Uint16(b[idx : idx+2])
+			if err := m.UnmarshalDomainPointTo(sb, int(offset&0x3FFF)); err != nil {
+				return 0, err
+			}
+
+			idx += 2
+			break
+		}
+
+		size = int(b[idx])
+		idx++
+
+		// root domain name
+		if size == 0 {
+			break
+		}
+
+		if size > 63 {
+			return 0, errors.New("UnmarshalDomainTo: label size larger than 63")
+		}
+
+		if idx+size > len(b) {
+			return 0, errors.New("UnmarshalDomainTo: label size larger than msg length")
+		}
+
+		if sb.Len() > 0 {
+			sb.WriteByte('.')
+		}
+		sb.Write(b[idx : idx+size])
+
+		idx += size
+	}
+
+	return idx, nil
+}
+
+// UnmarshalDomainPointTo gets domain from offset point to string builder.
+func (m *Message) UnmarshalDomainPointTo(sb *strings.Builder, offset int) error {
+	if offset > len(m.unMarshaled) {
+		return errors.New("UnmarshalDomainPointTo: offset larger than msg length")
+	}
+	_, err := m.UnmarshalDomainTo(sb, m.unMarshaled[offset:])
+	return err
+}

dns/server.go

@@ -0,0 +1,151 @@
+package dns
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/proxy"
+)
+
+// conn timeout, in seconds.
+const timeout = 30
+
+// Server is a dns server struct.
+type Server struct {
+	addr string
+	// Client is used to communicate with upstream dns servers
+	*Client
+}
+
+// NewServer returns a new dns server.
+func NewServer(addr string, p proxy.Proxy, config *Config) (*Server, error) {
+	c, err := NewClient(p, config)
+	if err != nil {
+		return nil, err
+	}
+
+	s := &Server{
+		addr:   addr,
+		Client: c,
+	}
+	return s, nil
+}
+
+// Start starts the dns forwarding server.
+// We use WaitGroup here to ensure both udp and tcp serer are completly running,
+// so we can start any other services later, since they may rely on dns service.
+func (s *Server) Start() {
+	var wg sync.WaitGroup
+	wg.Add(2)
+	go s.ListenAndServeTCP(&wg)
+	go s.ListenAndServeUDP(&wg)
+	wg.Wait()
+}
+
+// ListenAndServeUDP listen and serves on udp port.
+func (s *Server) ListenAndServeUDP(wg *sync.WaitGroup) {
+	pc, err := net.ListenPacket("udp", s.addr)
+	wg.Done()
+	if err != nil {
+		log.F("[dns] failed to listen on %s, error: %v", s.addr, err)
+		return
+	}
+	defer pc.Close()
+
+	log.F("[dns] listening UDP on %s", s.addr)
+
+	for {
+		reqBytes := pool.GetBuffer(UDPMaxLen)
+		n, caddr, err := pc.ReadFrom(reqBytes)
+		if err != nil {
+			log.F("[dns] local read error: %v", err)
+			pool.PutBuffer(reqBytes)
+			continue
+		}
+		go s.ServePacket(pc, caddr, reqBytes[:n])
+	}
+}
+
+// ServePacket serves dns packet conn.
+func (s *Server) ServePacket(pc net.PacketConn, caddr net.Addr, reqBytes []byte) {
+	respBytes, err := s.Exchange(reqBytes, caddr.String(), false)
+	defer func() {
+		pool.PutBuffer(reqBytes)
+		pool.PutBuffer(respBytes)
+	}()
+
+	if err != nil {
+		log.F("[dns] error in exchange for %s: %s", caddr, err)
+		return
+	}
+
+	_, err = pc.WriteTo(respBytes, caddr)
+	if err != nil {
+		log.F("[dns] error in local write to %s: %s", caddr, err)
+		return
+	}
+}
+
+// ListenAndServeTCP listen and serves on tcp port.
+func (s *Server) ListenAndServeTCP(wg *sync.WaitGroup) {
+	l, err := net.Listen("tcp", s.addr)
+	wg.Done()
+	if err != nil {
+		log.F("[dns-tcp] error: %v", err)
+		return
+	}
+	defer l.Close()
+
+	log.F("[dns-tcp] listening TCP on %s", s.addr)
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			log.F("[dns-tcp] error: failed to accept: %v", err)
+			continue
+		}
+		go s.ServeTCP(c)
+	}
+}
+
+// ServeTCP serves a dns tcp connection.
+func (s *Server) ServeTCP(c net.Conn) {
+	defer c.Close()
+
+	c.SetDeadline(time.Now().Add(time.Duration(timeout) * time.Second))
+
+	var reqLen uint16
+	if err := binary.Read(c, binary.BigEndian, &reqLen); err != nil {
+		log.F("[dns-tcp] failed to get request length: %v", err)
+		return
+	}
+
+	reqBytes := pool.GetBuffer(int(reqLen))
+	defer pool.PutBuffer(reqBytes)
+
+	_, err := io.ReadFull(c, reqBytes)
+	if err != nil {
+		log.F("[dns-tcp] error in read reqBytes %s", err)
+		return
+	}
+
+	respBytes, err := s.Exchange(reqBytes, c.RemoteAddr().String(), true)
+	defer pool.PutBuffer(respBytes)
+	if err != nil {
+		log.F("[dns-tcp] error in exchange: %s", err)
+		return
+	}
+
+	lenBuf := pool.GetBuffer(2)
+	defer pool.PutBuffer(lenBuf)
+
+	binary.BigEndian.PutUint16(lenBuf, uint16(len(respBytes)))
+	if _, err := (&net.Buffers{lenBuf, respBytes}).WriteTo(c); err != nil {
+		log.F("[dns-tcp] error in write respBytes: %s", err)
+	}
+}

dns/upstream.go

@@ -0,0 +1,46 @@
+package dns
+
+import (
+	"net"
+	"sync/atomic"
+)
+
+// UPStream is a dns upstream.
+type UPStream struct {
+	index   uint32
+	servers []string
+}
+
+// NewUPStream returns a new UpStream.
+func NewUPStream(servers []string) *UPStream {
+	// default port for dns upstream servers
+	for i, server := range servers {
+		if _, port, _ := net.SplitHostPort(server); port == "" {
+			servers[i] = net.JoinHostPort(server, "53")
+		}
+	}
+	return &UPStream{servers: servers}
+}
+
+// Server returns a dns server.
+func (u *UPStream) Server() string {
+	return u.servers[atomic.LoadUint32(&u.index)%uint32(len(u.servers))]
+}
+
+// Switch switches to the next dns server.
+func (u *UPStream) Switch() string {
+	return u.servers[atomic.AddUint32(&u.index, 1)%uint32(len(u.servers))]
+}
+
+// SwitchIf switches to the next dns server if needed.
+func (u *UPStream) SwitchIf(server string) string {
+	if u.Server() == server {
+		return u.Switch()
+	}
+	return u.Server()
+}
+
+// Len returns the number of dns servers.
+func (u *UPStream) Len() int {
+	return len(u.servers)
+}

dnstun.go

@@ -1,40 +0,0 @@
-// https://tools.ietf.org/html/rfc1035
-
-package main
-
-// DNSTun struct
-type DNSTun struct {
-	*Forwarder        // as client
-	sDialer    Dialer // dialer for server
-
-	raddr string
-
-	udp *DNS
-	tcp *TCPTun
-}
-
-// NewDNSTun returns a dns tunnel forwarder.
-func NewDNSTun(addr, raddr string, sDialer Dialer) (*DNSTun, error) {
-	s := &DNSTun{
-		Forwarder: NewForwarder(addr, nil),
-		sDialer:   sDialer,
-
-		raddr: raddr,
-	}
-
-	s.udp, _ = NewDNS(addr, raddr, sDialer)
-	s.tcp, _ = NewTCPTun(addr, raddr, sDialer)
-
-	return s, nil
-}
-
-// ListenAndServe .
-func (s *DNSTun) ListenAndServe() {
-	if s.udp != nil {
-		go s.udp.ListenAndServe()
-	}
-
-	if s.tcp != nil {
-		s.tcp.ListenAndServe()
-	}
-}

feature.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	// comment out the services you don't need to make the compiled binary smaller.
+	// _ "github.com/nadoo/glider/service/xxx"
+
+	// comment out the protocols you don't need to make the compiled binary smaller.
+	_ "github.com/nadoo/glider/proxy/http"
+	_ "github.com/nadoo/glider/proxy/kcp"
+	_ "github.com/nadoo/glider/proxy/mixed"
+	_ "github.com/nadoo/glider/proxy/obfs"
+	_ "github.com/nadoo/glider/proxy/pxyproto"
+	_ "github.com/nadoo/glider/proxy/reject"
+	_ "github.com/nadoo/glider/proxy/smux"
+	_ "github.com/nadoo/glider/proxy/socks4"
+	_ "github.com/nadoo/glider/proxy/socks5"
+	_ "github.com/nadoo/glider/proxy/ss"
+	_ "github.com/nadoo/glider/proxy/ssh"
+	_ "github.com/nadoo/glider/proxy/ssr"
+	_ "github.com/nadoo/glider/proxy/tcp"
+	_ "github.com/nadoo/glider/proxy/tls"
+	_ "github.com/nadoo/glider/proxy/trojan"
+	_ "github.com/nadoo/glider/proxy/udp"
+	_ "github.com/nadoo/glider/proxy/vless"
+	_ "github.com/nadoo/glider/proxy/vmess"
+	_ "github.com/nadoo/glider/proxy/ws"
+)

feature_linux.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	// comment out the services you don't need to make the compiled binary smaller.
+	_ "github.com/nadoo/glider/service/dhcpd"
+
+	// comment out the protocols you don't need to make the compiled binary smaller.
+	_ "github.com/nadoo/glider/proxy/redir"
+	_ "github.com/nadoo/glider/proxy/tproxy"
+	_ "github.com/nadoo/glider/proxy/unix"
+	_ "github.com/nadoo/glider/proxy/vsock"
+)

forwarder.go

@@ -1,31 +0,0 @@
-package main
-
-import "net"
-
-// Forwarder struct
-type Forwarder struct {
-	addr    string
-	cDialer Dialer
-}
-
-// NewForwarder returns a base forwarder
-func NewForwarder(addr string, cDialer Dialer) *Forwarder {
-	if cDialer == nil {
-		cDialer = Direct
-	}
-
-	return &Forwarder{addr: addr, cDialer: cDialer}
-}
-
-// Addr returns forwarder's address
-func (p *Forwarder) Addr() string { return p.addr }
-
-// Dial to remote addr via cDialer
-func (p *Forwarder) Dial(network, addr string) (net.Conn, error) {
-	return p.cDialer.Dial(network, addr)
-}
-
-// NextDialer returns the next cDialer
-func (p *Forwarder) NextDialer(dstAddr string) Dialer {
-	return p.cDialer
-}

go.mod

@@ -0,0 +1,29 @@
+module github.com/nadoo/glider
+
+go 1.24
+
+require (
+	github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da
+	github.com/dgryski/go-camellia v0.0.0-20191119043421-69a8a13fb23d
+	github.com/dgryski/go-idea v0.0.0-20170306091226-d2fb45a411fb
+	github.com/dgryski/go-rc2 v0.0.0-20150621095337-8a9021637152
+	github.com/insomniacslk/dhcp v0.0.0-20250109001534-8abf58130905
+	github.com/nadoo/conflag v0.3.1
+	github.com/nadoo/ipset v0.5.0
+	github.com/xtaci/kcp-go/v5 v5.6.18
+	golang.org/x/crypto v0.35.0
+	golang.org/x/sys v0.30.0
+)
+
+require (
+	github.com/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.10 // indirect
+	github.com/klauspost/reedsolomon v1.12.4 // indirect
+	github.com/pierrec/lz4/v4 v4.1.22 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/templexxx/cpu v0.1.1 // indirect
+	github.com/templexxx/xorsimd v0.4.3 // indirect
+	github.com/tjfoc/gmsm v1.4.1 // indirect
+	github.com/u-root/uio v0.0.0-20240224005618-d2acac8f3701 // indirect
+	golang.org/x/net v0.35.0 // indirect
+)

go.sum

@@ -0,0 +1,129 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmHS9iAKVt9AyzRSqNU1qabPih5BY=
+github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da/go.mod h1:eHEWzANqSiWQsof+nXEI9bUVUyV6F53Fp89EuCh2EAA=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
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http.go

@@ -1,271 +0,0 @@
-// http proxy
-// NOTE: never keep-alive so the implementation can be much easier.
-
-package main
-
-import (
-	"bufio"
-	"bytes"
-	"encoding/base64"
-	"errors"
-	"fmt"
-	"io"
-	"net"
-	"net/textproto"
-	"net/url"
-	"strings"
-	"time"
-)
-
-// HTTP struct
-type HTTP struct {
-	*Forwarder        // as client
-	sDialer    Dialer // dialer for server
-
-	user     string
-	password string
-}
-
-// NewHTTP returns a http proxy.
-func NewHTTP(addr, user, pass string, cDialer Dialer, sDialer Dialer) (*HTTP, error) {
-	s := &HTTP{
-		Forwarder: NewForwarder(addr, cDialer),
-		sDialer:   sDialer,
-		user:      user,
-		password:  pass,
-	}
-
-	return s, nil
-}
-
-// ListenAndServe .
-func (s *HTTP) ListenAndServe() {
-	l, err := net.Listen("tcp", s.addr)
-	if err != nil {
-		logf("failed to listen on %s: %v", s.addr, err)
-		return
-	}
-	defer l.Close()
-
-	logf("listening TCP on %s", s.addr)
-
-	for {
-		c, err := l.Accept()
-		if err != nil {
-			logf("failed to accept: %v", err)
-			continue
-		}
-
-		go s.Serve(c)
-	}
-}
-
-// Serve .
-func (s *HTTP) Serve(c net.Conn) {
-	defer c.Close()
-
-	if c, ok := c.(*net.TCPConn); ok {
-		c.SetKeepAlive(true)
-	}
-
-	reqR := bufio.NewReader(c)
-	reqTP := textproto.NewReader(reqR)
-	method, requestURI, proto, ok := parseFirstLine(reqTP)
-	if !ok {
-		return
-	}
-
-	if method == "CONNECT" {
-		s.servHTTPS(method, requestURI, proto, c)
-		return
-	}
-
-	reqHeader, err := reqTP.ReadMIMEHeader()
-	if err != nil {
-		logf("read header error:%s", err)
-		return
-	}
-	cleanHeaders(reqHeader)
-	// tell the remote server not to keep alive
-	reqHeader.Set("Connection", "close")
-
-	url, err := url.ParseRequestURI(requestURI)
-	if err != nil {
-		logf("parse request url error: %s", err)
-		return
-	}
-
-	var tgt = url.Host
-	if !strings.Contains(url.Host, ":") {
-		tgt += ":80"
-	}
-
-	rc, err := s.sDialer.Dial("tcp", tgt)
-	if err != nil {
-		fmt.Fprintf(c, "%s 502 ERROR\r\n\r\n", proto)
-		logf("failed to dial: %v", err)
-		return
-	}
-	defer rc.Close()
-
-	// GET http://example.com/a/index.htm HTTP/1.1 -->
-	// GET /a/index.htm HTTP/1.1
-	url.Scheme = ""
-	url.Host = ""
-	uri := url.String()
-
-	var reqBuf bytes.Buffer
-	writeFirstLine(method, uri, proto, &reqBuf)
-	writeHeaders(reqHeader, &reqBuf)
-
-	// send request to remote server
-	rc.Write(reqBuf.Bytes())
-
-	// copy the left request bytes to remote server. eg. length specificed or chunked body.
-	go func() {
-		io.Copy(rc, reqR)
-		rc.SetDeadline(time.Now())
-		c.SetDeadline(time.Now())
-	}()
-
-	respR := bufio.NewReader(rc)
-	respTP := textproto.NewReader(respR)
-	proto, code, status, ok := parseFirstLine(respTP)
-	if !ok {
-		return
-	}
-
-	respHeader, err := respTP.ReadMIMEHeader()
-	if err != nil {
-		logf("read header error:%s", err)
-		return
-	}
-
-	respHeader.Set("Proxy-Connection", "close")
-	respHeader.Set("Connection", "close")
-
-	var respBuf bytes.Buffer
-	writeFirstLine(proto, code, status, &respBuf)
-	writeHeaders(respHeader, &respBuf)
-
-	logf("proxy-http %s <-> %s", c.RemoteAddr(), tgt)
-	c.Write(respBuf.Bytes())
-
-	io.Copy(c, respR)
-
-}
-
-func (s *HTTP) servHTTPS(method, requestURI, proto string, c net.Conn) {
-	rc, err := s.sDialer.Dial("tcp", requestURI)
-	if err != nil {
-		c.Write([]byte(proto))
-		c.Write([]byte(" 502 ERROR\r\n\r\n"))
-		logf("failed to dial: %v", err)
-		return
-	}
-
-	c.Write([]byte("HTTP/1.0 200 Connection established\r\n\r\n"))
-
-	logf("proxy-https %s <-> %s", c.RemoteAddr(), requestURI)
-
-	_, _, err = relay(c, rc)
-	if err != nil {
-		if err, ok := err.(net.Error); ok && err.Timeout() {
-			return // ignore i/o timeout
-		}
-		logf("relay error: %v", err)
-	}
-}
-
-// Dial connects to the address addr on the network net via the proxy.
-func (s *HTTP) Dial(network, addr string) (net.Conn, error) {
-	rc, err := s.cDialer.Dial("tcp", s.addr)
-	if err != nil {
-		logf("dial to %s error: %s", s.addr, err)
-		return nil, err
-	}
-
-	if c, ok := rc.(*net.TCPConn); ok {
-		c.SetKeepAlive(true)
-	}
-
-	rc.Write([]byte("CONNECT " + addr + " HTTP/1.0\r\n"))
-	rc.Write([]byte("Proxy-Connection: close\r\n"))
-
-	if s.user != "" && s.password != "" {
-		auth := s.user + ":" + s.password
-		rc.Write([]byte("Proxy-Authorization: Basic " + base64.StdEncoding.EncodeToString([]byte(auth)) + "\r\n"))
-	}
-
-	//header ended
-	rc.Write([]byte("\r\n"))
-
-	respR := bufio.NewReader(rc)
-	respTP := textproto.NewReader(respR)
-	_, code, _, ok := parseFirstLine(respTP)
-	if ok && code == "200" {
-		return rc, err
-	} else if code == "407" {
-		logf("proxy-http: authencation needed by proxy %s", s.addr)
-	} else if code == "405" {
-		logf("proxy-http: 'CONNECT' method not allowed by proxy %s", s.addr)
-	}
-
-	return nil, errors.New("cound not connect remote address: " + addr + ". error code: " + code)
-}
-
-// parseFirstLine parses "GET /foo HTTP/1.1" OR "HTTP/1.1 200 OK" into its three parts.
-func parseFirstLine(tp *textproto.Reader) (r1, r2, r3 string, ok bool) {
-	line, err := tp.ReadLine()
-	// logf("first line: %s", line)
-	if err != nil {
-		logf("read request line error:%s", err)
-		return
-	}
-
-	s1 := strings.Index(line, " ")
-	s2 := strings.Index(line[s1+1:], " ")
-	if s1 < 0 || s2 < 0 {
-		return
-	}
-	s2 += s1 + 1
-	return line[:s1], line[s1+1 : s2], line[s2+1:], true
-}
-
-func cleanHeaders(header textproto.MIMEHeader) {
-	header.Del("Proxy-Connection")
-	header.Del("Connection")
-	header.Del("Keep-Alive")
-	header.Del("Proxy-Authenticate")
-	header.Del("Proxy-Authorization")
-	header.Del("TE")
-	header.Del("Trailers")
-	header.Del("Transfer-Encoding")
-	header.Del("Upgrade")
-}
-
-func writeFirstLine(s1, s2, s3 string, buf *bytes.Buffer) {
-	buf.Write([]byte(s1))
-	buf.Write([]byte(" "))
-	buf.Write([]byte(s2))
-	buf.Write([]byte(" "))
-	buf.Write([]byte(s3))
-	buf.Write([]byte("\r\n"))
-}
-
-func writeHeaders(header textproto.MIMEHeader, buf *bytes.Buffer) {
-	for key, values := range header {
-		buf.Write([]byte(key))
-		buf.Write([]byte(": "))
-		for k, v := range values {
-			buf.Write([]byte(v))
-			if k > 0 {
-				buf.Write([]byte(" "))
-			}
-		}
-		buf.Write([]byte("\r\n"))
-	}
-
-	//header ended
-	buf.Write([]byte("\r\n"))
-}

ipset/ipset_linux.go

@@ -0,0 +1,78 @@
+package ipset
+
+import (
+	"net/netip"
+	"strings"
+	"sync"
+
+	"github.com/nadoo/ipset"
+
+	"github.com/nadoo/glider/rule"
+)
+
+// Manager struct.
+type Manager struct {
+	domainSet sync.Map
+}
+
+// NewManager returns a Manager
+func NewManager(rules []*rule.Config) (*Manager, error) {
+	if err := ipset.Init(); err != nil {
+		return nil, err
+	}
+
+	m := &Manager{}
+	sets := make(map[string]struct{})
+
+	for _, r := range rules {
+		if r.IPSet == "" {
+			continue
+		}
+
+		if _, ok := sets[r.IPSet]; !ok {
+			sets[r.IPSet] = struct{}{}
+			ipset.Create(r.IPSet)
+			ipset.Flush(r.IPSet)
+			ipset.Create(r.IPSet+"6", ipset.OptIPv6())
+			ipset.Flush(r.IPSet + "6")
+		}
+
+		for _, domain := range r.Domain {
+			m.domainSet.Store(domain, r.IPSet)
+		}
+		for _, ip := range r.IP {
+			addToSet(r.IPSet, ip)
+		}
+		for _, cidr := range r.CIDR {
+			addToSet(r.IPSet, cidr)
+		}
+	}
+
+	return m, nil
+}
+
+// AddDomainIP implements the dns AnswerHandler function, used to update ipset according to domainSet rule.
+func (m *Manager) AddDomainIP(domain string, ip netip.Addr) error {
+	domain = strings.ToLower(domain)
+	for i := len(domain); i != -1; {
+		i = strings.LastIndexByte(domain[:i], '.')
+		if setName, ok := m.domainSet.Load(domain[i+1:]); ok {
+			addAddrToSet(setName.(string), ip)
+		}
+	}
+	return nil
+}
+
+func addToSet(s, item string) error {
+	if strings.IndexByte(item, '.') == -1 {
+		return ipset.Add(s+"6", item)
+	}
+	return ipset.Add(s, item)
+}
+
+func addAddrToSet(s string, ip netip.Addr) error {
+	if ip.Is4() {
+		return ipset.AddAddr(s, ip)
+	}
+	return ipset.AddAddr(s+"6", ip)
+}

ipset/ipset_other.go

@@ -0,0 +1,23 @@
+//go:build !linux
+
+package ipset
+
+import (
+	"errors"
+	"net/netip"
+
+	"github.com/nadoo/glider/rule"
+)
+
+// Manager struct
+type Manager struct{}
+
+// NewManager returns a Manager
+func NewManager(rules []*rule.Config) (*Manager, error) {
+	return nil, errors.New("ipset not supported on this os")
+}
+
+// AddDomainIP implements the DNSAnswerHandler function
+func (m *Manager) AddDomainIP(domain string, ip netip.Addr) error {
+	return errors.New("ipset not supported on this os")
+}

ipset_linux.go

@@ -1,472 +0,0 @@
-// Apache License 2.0
-// @mdlayher https://github.com/mdlayher/netlink
-// Ref: https://github.com/vishvananda/netlink/blob/master/nl/nl_linux.go
-
-package main
-
-import (
-	"bytes"
-	"encoding/binary"
-	"log"
-	"net"
-	"strings"
-	"sync"
-	"sync/atomic"
-	"syscall"
-	"unsafe"
-)
-
-// netfilter netlink message types
-// https://github.com/torvalds/linux/blob/9e66317d3c92ddaab330c125dfe9d06eee268aff/include/uapi/linux/netfilter/nfnetlink.h#L56
-const NFNL_SUBSYS_IPSET = 6
-
-// http://git.netfilter.org/ipset/tree/include/libipset/linux_ip_set.h
-/* The protocol version */
-const IPSET_PROTOCOL = 6
-
-/* The max length of strings including NUL: set and type identifiers */
-const IPSET_MAXNAMELEN = 32
-
-/* Message types and commands */
-const IPSET_CMD_CREATE = 2
-const IPSET_CMD_FLUSH = 4
-const IPSET_CMD_ADD = 9
-const IPSET_CMD_DEL = 10
-
-/* Attributes at command level */
-const IPSET_ATTR_PROTOCOL = 1 /* 1: Protocol version */
-const IPSET_ATTR_SETNAME = 2  /* 2: Name of the set */
-const IPSET_ATTR_TYPENAME = 3 /* 3: Typename */
-const IPSET_ATTR_REVISION = 4 /* 4: Settype revision */
-const IPSET_ATTR_FAMILY = 5   /* 5: Settype family */
-const IPSET_ATTR_DATA = 7     /* 7: Nested attributes */
-
-/* CADT specific attributes */
-const IPSET_ATTR_IP = 1
-const IPSET_ATTR_CIDR = 3
-
-/* IP specific attributes */
-const IPSET_ATTR_IPADDR_IPV4 = 1
-const IPSET_ATTR_IPADDR_IPV6 = 2
-
-const NLA_F_NESTED = (1 << 15)
-const NLA_F_NET_BYTEORDER = (1 << 14)
-
-var nextSeqNr uint32
-var nativeEndian binary.ByteOrder
-
-// IPSetManager struct
-type IPSetManager struct {
-	fd  int
-	lsa syscall.SockaddrNetlink
-
-	mainSet   string
-	domainSet sync.Map
-}
-
-// NewIPSetManager returns a IPSetManager
-func NewIPSetManager(mainSet string, rules []*RuleConf) (*IPSetManager, error) {
-	fd, err := syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_RAW, syscall.NETLINK_NETFILTER)
-	if err != nil {
-		logf("%s", err)
-		return nil, err
-	}
-	// defer syscall.Close(fd)
-
-	lsa := syscall.SockaddrNetlink{
-		Family: syscall.AF_NETLINK,
-	}
-
-	if err = syscall.Bind(fd, &lsa); err != nil {
-		logf("%s", err)
-		return nil, err
-	}
-
-	m := &IPSetManager{fd: fd, lsa: lsa, mainSet: mainSet}
-
-	CreateSet(fd, lsa, mainSet)
-
-	for _, r := range rules {
-
-		set := r.IPSet
-
-		if set != "" && set != m.mainSet {
-			CreateSet(fd, lsa, set)
-		} else {
-			set = m.mainSet
-		}
-
-		for _, domain := range r.Domain {
-			m.domainSet.Store(domain, set)
-		}
-
-		for _, ip := range r.IP {
-			AddToSet(fd, lsa, mainSet, ip)
-			AddToSet(fd, lsa, r.IPSet, ip)
-		}
-
-		for _, cidr := range r.CIDR {
-			AddToSet(fd, lsa, mainSet, cidr)
-			AddToSet(fd, lsa, r.IPSet, cidr)
-		}
-
-	}
-
-	return m, nil
-}
-
-// AddDomainIP implements the DNSAnswerHandler function, used to update ipset according to domainSet rule
-func (m *IPSetManager) AddDomainIP(domain, ip string) error {
-
-	if ip != "" {
-		domainParts := strings.Split(domain, ".")
-		length := len(domainParts)
-		for i := length - 2; i >= 0; i-- {
-			domain := strings.Join(domainParts[i:length], ".")
-
-			// find in domainMap
-			if ipset, ok := m.domainSet.Load(domain); ok {
-				AddToSet(m.fd, m.lsa, m.mainSet, ip)
-				AddToSet(m.fd, m.lsa, ipset.(string), ip)
-			}
-		}
-
-	}
-	return nil
-}
-
-func CreateSet(fd int, lsa syscall.SockaddrNetlink, setName string) {
-	if setName == "" {
-		return
-	}
-
-	if len(setName) > IPSET_MAXNAMELEN {
-		log.Fatal("ipset name too long")
-	}
-
-	logf("ipset: create %s hash:net", setName)
-
-	req := NewNetlinkRequest(IPSET_CMD_CREATE|(NFNL_SUBSYS_IPSET<<8), syscall.NLM_F_REQUEST)
-
-	// TODO: support AF_INET6
-	nfgenMsg := NewNfGenMsg(syscall.AF_INET, 0, 0)
-	req.AddData(nfgenMsg)
-
-	attrProto := NewRtAttr(IPSET_ATTR_PROTOCOL, Uint8Attr(IPSET_PROTOCOL))
-	req.AddData(attrProto)
-
-	attrSiteName := NewRtAttr(IPSET_ATTR_SETNAME, ZeroTerminated(setName))
-	req.AddData(attrSiteName)
-
-	attrSiteType := NewRtAttr(IPSET_ATTR_TYPENAME, ZeroTerminated("hash:net"))
-	req.AddData(attrSiteType)
-
-	attrRev := NewRtAttr(IPSET_ATTR_REVISION, Uint8Attr(1))
-	req.AddData(attrRev)
-
-	attrFamily := NewRtAttr(IPSET_ATTR_FAMILY, Uint8Attr(2))
-	req.AddData(attrFamily)
-
-	attrData := NewRtAttr(IPSET_ATTR_DATA|NLA_F_NESTED, nil)
-	req.AddData(attrData)
-
-	err := syscall.Sendto(fd, req.Serialize(), 0, &lsa)
-	if err != nil {
-		logf("%s", err)
-	}
-
-	FlushSet(fd, lsa, setName)
-}
-
-func FlushSet(fd int, lsa syscall.SockaddrNetlink, setName string) {
-	logf("ipset: flush %s", setName)
-
-	req := NewNetlinkRequest(IPSET_CMD_FLUSH|(NFNL_SUBSYS_IPSET<<8), syscall.NLM_F_REQUEST)
-
-	// TODO: support AF_INET6
-	req.AddData(NewNfGenMsg(syscall.AF_INET, 0, 0))
-	req.AddData(NewRtAttr(IPSET_ATTR_PROTOCOL, Uint8Attr(IPSET_PROTOCOL)))
-	req.AddData(NewRtAttr(IPSET_ATTR_SETNAME, ZeroTerminated(setName)))
-
-	err := syscall.Sendto(fd, req.Serialize(), 0, &lsa)
-	if err != nil {
-		logf("%s", err)
-	}
-
-}
-
-func AddToSet(fd int, lsa syscall.SockaddrNetlink, setName, entry string) {
-	if setName == "" {
-		return
-	}
-
-	if len(setName) > IPSET_MAXNAMELEN {
-		logf("ipset name too long")
-	}
-
-	logf("ipset: add %s %s", setName, entry)
-
-	var ip net.IP
-	var cidr *net.IPNet
-
-	ip, cidr, err := net.ParseCIDR(entry)
-	if err != nil {
-		ip = net.ParseIP(entry)
-	}
-
-	if ip == nil {
-		logf("ipset: parse %s error", entry)
-		return
-	}
-
-	req := NewNetlinkRequest(IPSET_CMD_ADD|(NFNL_SUBSYS_IPSET<<8), syscall.NLM_F_REQUEST)
-
-	// TODO: support AF_INET6
-	nfgenMsg := NewNfGenMsg(syscall.AF_INET, 0, 0)
-	req.AddData(nfgenMsg)
-
-	attrProto := NewRtAttr(IPSET_ATTR_PROTOCOL, Uint8Attr(IPSET_PROTOCOL))
-	req.AddData(attrProto)
-
-	attrSiteName := NewRtAttr(IPSET_ATTR_SETNAME, ZeroTerminated(setName))
-	req.AddData(attrSiteName)
-
-	attrNested := NewRtAttr(IPSET_ATTR_DATA|NLA_F_NESTED, nil)
-	attrIP := NewRtAttrChild(attrNested, IPSET_ATTR_IP|NLA_F_NESTED, nil)
-
-	// TODO: support ipV6
-	NewRtAttrChild(attrIP, IPSET_ATTR_IPADDR_IPV4|NLA_F_NET_BYTEORDER, ip.To4())
-
-	// for cidr prefix
-	if cidr != nil {
-		cidrPrefix, _ := cidr.Mask.Size()
-		NewRtAttrChild(attrNested, IPSET_ATTR_CIDR, Uint8Attr(uint8(cidrPrefix)))
-	}
-
-	NewRtAttrChild(attrNested, 9|NLA_F_NET_BYTEORDER, Uint32Attr(0))
-	req.AddData(attrNested)
-
-	err = syscall.Sendto(fd, req.Serialize(), 0, &lsa)
-	if err != nil {
-		logf("%s", err)
-	}
-}
-
-// Get native endianness for the system
-func NativeEndian() binary.ByteOrder {
-	if nativeEndian == nil {
-		var x uint32 = 0x01020304
-		if *(*byte)(unsafe.Pointer(&x)) == 0x01 {
-			nativeEndian = binary.BigEndian
-		} else {
-			nativeEndian = binary.LittleEndian
-		}
-	}
-	return nativeEndian
-}
-
-func rtaAlignOf(attrlen int) int {
-	return (attrlen + syscall.RTA_ALIGNTO - 1) & ^(syscall.RTA_ALIGNTO - 1)
-}
-
-type NetlinkRequestData interface {
-	Len() int
-	Serialize() []byte
-}
-
-type NfGenMsg struct {
-	nfgenFamily uint8
-	version     uint8
-	resID       uint16
-}
-
-func NewNfGenMsg(nfgenFamily, version, resID int) *NfGenMsg {
-	return &NfGenMsg{
-		nfgenFamily: uint8(nfgenFamily),
-		version:     uint8(version),
-		resID:       uint16(resID),
-	}
-}
-
-func (m *NfGenMsg) Len() int {
-	return rtaAlignOf(4)
-}
-
-func (m *NfGenMsg) Serialize() []byte {
-	native := NativeEndian()
-
-	length := m.Len()
-	buf := make([]byte, rtaAlignOf(length))
-	buf[0] = m.nfgenFamily
-	buf[1] = m.version
-	native.PutUint16(buf[2:4], m.resID)
-	return buf
-}
-
-// Extend RtAttr to handle data and children
-type RtAttr struct {
-	syscall.RtAttr
-	Data     []byte
-	children []NetlinkRequestData
-}
-
-// Create a new Extended RtAttr object
-func NewRtAttr(attrType int, data []byte) *RtAttr {
-	return &RtAttr{
-		RtAttr: syscall.RtAttr{
-			Type: uint16(attrType),
-		},
-		children: []NetlinkRequestData{},
-		Data:     data,
-	}
-}
-
-// Create a new RtAttr obj anc add it as a child of an existing object
-func NewRtAttrChild(parent *RtAttr, attrType int, data []byte) *RtAttr {
-	attr := NewRtAttr(attrType, data)
-	parent.children = append(parent.children, attr)
-	return attr
-}
-
-func (a *RtAttr) Len() int {
-	if len(a.children) == 0 {
-		return (syscall.SizeofRtAttr + len(a.Data))
-	}
-
-	l := 0
-	for _, child := range a.children {
-		l += rtaAlignOf(child.Len())
-	}
-	l += syscall.SizeofRtAttr
-	return rtaAlignOf(l + len(a.Data))
-}
-
-// Serialize the RtAttr into a byte array
-// This can't just unsafe.cast because it must iterate through children.
-func (a *RtAttr) Serialize() []byte {
-	native := NativeEndian()
-
-	length := a.Len()
-	buf := make([]byte, rtaAlignOf(length))
-
-	next := 4
-	if a.Data != nil {
-		copy(buf[next:], a.Data)
-		next += rtaAlignOf(len(a.Data))
-	}
-	if len(a.children) > 0 {
-		for _, child := range a.children {
-			childBuf := child.Serialize()
-			copy(buf[next:], childBuf)
-			next += rtaAlignOf(len(childBuf))
-		}
-	}
-
-	if l := uint16(length); l != 0 {
-		native.PutUint16(buf[0:2], l)
-	}
-	native.PutUint16(buf[2:4], a.Type)
-	return buf
-}
-
-type NetlinkRequest struct {
-	syscall.NlMsghdr
-	Data    []NetlinkRequestData
-	RawData []byte
-}
-
-// Create a new netlink request from proto and flags
-// Note the Len value will be inaccurate once data is added until
-// the message is serialized
-func NewNetlinkRequest(proto, flags int) *NetlinkRequest {
-	return &NetlinkRequest{
-		NlMsghdr: syscall.NlMsghdr{
-			Len:   uint32(syscall.SizeofNlMsghdr),
-			Type:  uint16(proto),
-			Flags: syscall.NLM_F_REQUEST | uint16(flags),
-			Seq:   atomic.AddUint32(&nextSeqNr, 1),
-			// Pid:   uint32(os.Getpid()),
-		},
-	}
-}
-
-// Serialize the Netlink Request into a byte array
-func (req *NetlinkRequest) Serialize() []byte {
-	length := syscall.SizeofNlMsghdr
-	dataBytes := make([][]byte, len(req.Data))
-	for i, data := range req.Data {
-		dataBytes[i] = data.Serialize()
-		length = length + len(dataBytes[i])
-	}
-	length += len(req.RawData)
-
-	req.Len = uint32(length)
-	b := make([]byte, length)
-	hdr := (*(*[syscall.SizeofNlMsghdr]byte)(unsafe.Pointer(req)))[:]
-	next := syscall.SizeofNlMsghdr
-	copy(b[0:next], hdr)
-	for _, data := range dataBytes {
-		for _, dataByte := range data {
-			b[next] = dataByte
-			next = next + 1
-		}
-	}
-	// Add the raw data if any
-	if len(req.RawData) > 0 {
-		copy(b[next:length], req.RawData)
-	}
-	return b
-}
-
-func (req *NetlinkRequest) AddData(data NetlinkRequestData) {
-	if data != nil {
-		req.Data = append(req.Data, data)
-	}
-}
-
-// AddRawData adds raw bytes to the end of the NetlinkRequest object during serialization
-func (req *NetlinkRequest) AddRawData(data []byte) {
-	if data != nil {
-		req.RawData = append(req.RawData, data...)
-	}
-}
-
-func Uint8Attr(v uint8) []byte {
-	return []byte{byte(v)}
-}
-
-func Uint16Attr(v uint16) []byte {
-	native := NativeEndian()
-	bytes := make([]byte, 2)
-	native.PutUint16(bytes, v)
-	return bytes
-}
-
-func Uint32Attr(v uint32) []byte {
-	native := NativeEndian()
-	bytes := make([]byte, 4)
-	native.PutUint32(bytes, v)
-	return bytes
-}
-
-func ZeroTerminated(s string) []byte {
-	bytes := make([]byte, len(s)+1)
-	for i := 0; i < len(s); i++ {
-		bytes[i] = s[i]
-	}
-	bytes[len(s)] = 0
-	return bytes
-}
-
-func NonZeroTerminated(s string) []byte {
-	bytes := make([]byte, len(s))
-	for i := 0; i < len(s); i++ {
-		bytes[i] = s[i]
-	}
-	return bytes
-}
-
-func BytesToString(b []byte) string {
-	n := bytes.Index(b, []byte{0})
-	return string(b[:n])
-}

ipset_other.go

@@ -1,18 +0,0 @@
-// +build !linux
-
-package main
-
-import "errors"
-
-// IPSetManager struct
-type IPSetManager struct{}
-
-// NewIPSetManager returns a IPSetManager
-func NewIPSetManager(mainSet string, rules []*RuleConf) (*IPSetManager, error) {
-	return nil, errors.New("ipset not supported on this os")
-}
-
-// AddDomainIP implements the DNSAnswerHandler function
-func (m *IPSetManager) AddDomainIP(domain, ip string) error {
-	return errors.New("ipset not supported on this os")
-}

log.go

@@ -1,16 +0,0 @@
-package main
-
-import "log"
-
-// LogFunc defines a simple log function
-type LogFunc func(f string, v ...interface{})
-
-var logf LogFunc
-
-func init() {
-	logf = func(f string, v ...interface{}) {
-		if conf.Verbose {
-			log.Printf(f, v...)
-		}
-	}
-}

main.go

@@ -1,75 +1,90 @@
 package main
 
 import (
-	"log"
+	"context"
+	"net"
 	"os"
 	"os/signal"
-	"strings"
 	"syscall"
+	"time"
+
+	"github.com/nadoo/glider/dns"
+	"github.com/nadoo/glider/ipset"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/proxy"
+	"github.com/nadoo/glider/rule"
+	"github.com/nadoo/glider/service"
 )
 
-// VERSION .
-const VERSION = "0.4.3"
-
-func dialerFromConf() Dialer {
-	// global forwarders in xx.conf
-	var forwarders []Dialer
-	for _, chain := range conf.Forward {
-		var forward Dialer
-		var err error
-		for _, url := range strings.Split(chain, ",") {
-			forward, err = DialerFromURL(url, forward)
-			if err != nil {
-				log.Fatal(err)
-			}
-		}
-		forwarders = append(forwarders, forward)
-	}
-
-	return NewStrategyDialer(conf.Strategy, forwarders, conf.CheckWebSite, conf.CheckDuration)
-}
+var (
+	version = "0.17.0"
+	config  = parseConfig()
+)
 
 func main() {
+	// global rule proxy
+	pxy := rule.NewProxy(config.Forwards, &config.Strategy, config.rules)
 
-	confInit()
-	sDialer := NewRuleDialer(conf.rules, dialerFromConf())
+	// ipset manager
+	ipsetM, _ := ipset.NewManager(config.rules)
 
-	for _, listen := range conf.Listen {
-		local, err := ServerFromURL(listen, sDialer)
+	// check and setup dns server
+	if config.DNS != "" {
+		d, err := dns.NewServer(config.DNS, pxy, &config.DNSConfig)
 		if err != nil {
 			log.Fatal(err)
 		}
 
-		go local.ListenAndServe()
-	}
-
-	ipsetM, err := NewIPSetManager(conf.IPSet, conf.rules)
-	if err != nil {
-		logf("create ipset manager error: %s", err)
-	}
-
-	if conf.DNS != "" {
-		dns, err := NewDNS(conf.DNS, conf.DNSServer[0], sDialer)
-		if err != nil {
-			log.Fatal(err)
-		}
-
-		// rule
-		for _, frwder := range conf.rules {
-			for _, domain := range frwder.Domain {
-				if len(frwder.DNSServer) > 0 {
-					dns.SetServer(domain, frwder.DNSServer[0])
+		// rules
+		for _, r := range config.rules {
+			if len(r.DNSServers) > 0 {
+				for _, domain := range r.Domain {
+					d.SetServers(domain, r.DNSServers)
 				}
 			}
 		}
 
 		// add a handler to update proxy rules when a domain resolved
-		dns.AddAnswerHandler(sDialer.AddDomainIP)
+		d.AddHandler(pxy.AddDomainIP)
 		if ipsetM != nil {
-			dns.AddAnswerHandler(ipsetM.AddDomainIP)
+			d.AddHandler(ipsetM.AddDomainIP)
 		}
 
-		go dns.ListenAndServe()
+		d.Start()
+
+		// custom resolver
+		net.DefaultResolver = &net.Resolver{
+			PreferGo: true,
+			Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+				d := net.Dialer{Timeout: time.Second * 3}
+				return d.DialContext(ctx, "udp", config.DNS)
+			},
+		}
+	}
+
+	for _, r := range config.rules {
+		r.IP, r.CIDR, r.Domain = nil, nil, nil
+	}
+
+	// enable checkers
+	pxy.Check()
+
+	// run proxy servers
+	for _, listen := range config.Listens {
+		local, err := proxy.ServerFromURL(listen, pxy)
+		if err != nil {
+			log.Fatal(err)
+		}
+		go local.ListenAndServe()
+	}
+
+	// run services
+	for _, s := range config.Services {
+		service, err := service.New(s)
+		if err != nil {
+			log.Fatal(err)
+		}
+		go service.Run()
 	}
 
 	sigCh := make(chan os.Signal, 1)

mixed.go

@@ -1,102 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"net"
-)
-
-// https://www.ietf.org/rfc/rfc2616.txt, http methods must be uppercase.
-var httpMethods = [...][]byte{
-	[]byte("GET"),
-	[]byte("POST"),
-	[]byte("PUT"),
-	[]byte("DELETE"),
-	[]byte("CONNECT"),
-	[]byte("HEAD"),
-	[]byte("OPTIONS"),
-	[]byte("TRACE"),
-}
-
-// MixedProxy struct
-type MixedProxy struct {
-	sDialer Dialer
-
-	addr   string
-	http   *HTTP
-	socks5 *SOCKS5
-}
-
-// NewMixedProxy returns a mixed proxy.
-func NewMixedProxy(addr, user, pass string, sDialer Dialer) (*MixedProxy, error) {
-	p := &MixedProxy{
-		sDialer: sDialer,
-		addr:    addr,
-	}
-
-	p.http, _ = NewHTTP(addr, user, pass, nil, sDialer)
-	p.socks5, _ = NewSOCKS5(addr, user, pass, nil, sDialer)
-
-	return p, nil
-}
-
-// ListenAndServe .
-func (p *MixedProxy) ListenAndServe() {
-	l, err := net.Listen("tcp", p.addr)
-	if err != nil {
-		logf("failed to listen on %s: %v", p.addr, err)
-		return
-	}
-
-	logf("listening TCP on %s", p.addr)
-
-	for {
-		c, err := l.Accept()
-		if err != nil {
-			logf("failed to accept: %v", err)
-			continue
-		}
-
-		go p.Serve(c)
-	}
-}
-
-// Serve .
-func (p *MixedProxy) Serve(conn net.Conn) {
-	defer conn.Close()
-
-	if c, ok := conn.(*net.TCPConn); ok {
-		c.SetKeepAlive(true)
-	}
-
-	c := newConn(conn)
-
-	if p.socks5 != nil {
-		head, err := c.Peek(1)
-		if err != nil {
-			logf("peek error: %s", err)
-			return
-		}
-
-		// check socks5, client send socksversion: 5 as the first byte
-		if head[0] == socks5Version {
-			p.socks5.Serve(c)
-			return
-		}
-	}
-
-	if p.http != nil {
-		head, err := c.Peek(8)
-		if err != nil {
-			logf("peek error: %s", err)
-			return
-		}
-
-		for _, method := range httpMethods {
-			if bytes.HasPrefix(head, method) {
-				p.http.Serve(c)
-				return
-			}
-		}
-	}
-
-}

pkg/log/log.go

@@ -0,0 +1,41 @@
+package log
+
+import (
+	"fmt"
+	stdlog "log"
+)
+
+var enable = false
+
+// Set sets the logger's verbose mode and output flags.
+func Set(verbose bool, flag int) {
+	enable = verbose
+	stdlog.SetFlags(flag)
+}
+
+// F prints debug log.
+func F(f string, v ...any) {
+	if enable {
+		stdlog.Output(2, fmt.Sprintf(f, v...))
+	}
+}
+
+// Print prints log.
+func Print(v ...any) {
+	stdlog.Print(v...)
+}
+
+// Printf prints log.
+func Printf(f string, v ...any) {
+	stdlog.Printf(f, v...)
+}
+
+// Fatal log and exit.
+func Fatal(v ...any) {
+	stdlog.Fatal(v...)
+}
+
+// Fatalf log and exit.
+func Fatalf(f string, v ...any) {
+	stdlog.Fatalf(f, v...)
+}

pkg/pool/buffer.go

@@ -0,0 +1,51 @@
+package pool
+
+import (
+	"math/bits"
+	"sync"
+	"unsafe"
+)
+
+const (
+	// number of pools.
+	num     = 17
+	maxsize = 1 << (num - 1)
+)
+
+var (
+	sizes [num]int
+	pools [num]sync.Pool
+)
+
+func init() {
+	for i := range num {
+		size := 1 << i
+		sizes[i] = size
+		pools[i].New = func() any {
+			buf := make([]byte, size)
+			return unsafe.SliceData(buf)
+		}
+	}
+}
+
+// GetBuffer gets a buffer from pool, size should in range: [1, 65536],
+// otherwise, this function will call make([]byte, size) directly.
+func GetBuffer(size int) []byte {
+	if size >= 1 && size <= maxsize {
+		i := bits.Len32(uint32(size - 1))
+		if p := pools[i].Get().(*byte); p != nil {
+			return unsafe.Slice(p, 1<<i)[:size]
+		}
+	}
+	return make([]byte, size)
+}
+
+// PutBuffer puts a buffer into pool.
+func PutBuffer(buf []byte) {
+	if size := cap(buf); size >= 1 && size <= maxsize {
+		i := bits.Len32(uint32(size - 1))
+		if sizes[i] == size {
+			pools[i].Put(unsafe.SliceData(buf))
+		}
+	}
+}

pkg/pool/bufreader.go

@@ -0,0 +1,24 @@
+package pool
+
+import (
+	"bufio"
+	"io"
+	"sync"
+)
+
+var bufReaderPool sync.Pool
+
+// GetBufReader returns a *bufio.Reader from pool.
+func GetBufReader(r io.Reader) *bufio.Reader {
+	if v := bufReaderPool.Get(); v != nil {
+		br := v.(*bufio.Reader)
+		br.Reset(r)
+		return br
+	}
+	return bufio.NewReader(r)
+}
+
+// PutBufReader puts a *bufio.Reader into pool.
+func PutBufReader(br *bufio.Reader) {
+	bufReaderPool.Put(br)
+}

pkg/pool/bytesbuffer.go

@@ -0,0 +1,23 @@
+package pool
+
+import (
+	"bytes"
+	"sync"
+)
+
+var bytesBufPool = sync.Pool{
+	New: func() any { return &bytes.Buffer{} },
+}
+
+// GetBytesBuffer returns a bytes.buffer from pool.
+func GetBytesBuffer() *bytes.Buffer {
+	return bytesBufPool.Get().(*bytes.Buffer)
+}
+
+// PutBytesBuffer puts a bytes.buffer into pool.
+func PutBytesBuffer(buf *bytes.Buffer) {
+	if buf.Cap() <= 64<<10 {
+		buf.Reset()
+		bytesBufPool.Put(buf)
+	}
+}

pkg/smux/frame.go

@@ -0,0 +1,106 @@
+// MIT License
+//
+// Copyright (c) 2016-2017 xtaci
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package smux
+
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+const ( // cmds
+	// protocol version 1:
+	cmdSYN byte = iota // stream open
+	cmdFIN             // stream close, a.k.a EOF mark
+	cmdPSH             // data push
+	cmdNOP             // no operation
+
+	// protocol version 2 extra commands
+	// notify bytes consumed by remote peer-end
+	cmdUPD
+)
+
+const (
+	// data size of cmdUPD, format:
+	// |4B data consumed(ACK)| 4B window size(WINDOW) |
+	szCmdUPD = 8
+)
+
+const (
+	// initial peer window guess, a slow-start
+	initialPeerWindow = 262144
+)
+
+const (
+	sizeOfVer    = 1
+	sizeOfCmd    = 1
+	sizeOfLength = 2
+	sizeOfSid    = 4
+	headerSize   = sizeOfVer + sizeOfCmd + sizeOfSid + sizeOfLength
+)
+
+// Frame defines a packet from or to be multiplexed into a single connection
+type Frame struct {
+	ver  byte   // version
+	cmd  byte   // command
+	sid  uint32 // stream id
+	data []byte // payload
+}
+
+// newFrame creates a new frame with given version, command and stream id
+func newFrame(version byte, cmd byte, sid uint32) Frame {
+	return Frame{ver: version, cmd: cmd, sid: sid}
+}
+
+// rawHeader is a byte array representation of Frame header
+type rawHeader [headerSize]byte
+
+func (h rawHeader) Version() byte {
+	return h[0]
+}
+
+func (h rawHeader) Cmd() byte {
+	return h[1]
+}
+
+func (h rawHeader) Length() uint16 {
+	return binary.LittleEndian.Uint16(h[2:])
+}
+
+func (h rawHeader) StreamID() uint32 {
+	return binary.LittleEndian.Uint32(h[4:])
+}
+
+func (h rawHeader) String() string {
+	return fmt.Sprintf("Version:%d Cmd:%d StreamID:%d Length:%d",
+		h.Version(), h.Cmd(), h.StreamID(), h.Length())
+}
+
+// updHeader is a byte array representation of cmdUPD
+type updHeader [szCmdUPD]byte
+
+func (h updHeader) Consumed() uint32 {
+	return binary.LittleEndian.Uint32(h[:])
+}
+func (h updHeader) Window() uint32 {
+	return binary.LittleEndian.Uint32(h[4:])
+}

pkg/smux/mux.go

@@ -0,0 +1,128 @@
+// MIT License
+//
+// Copyright (c) 2016-2017 xtaci
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package smux
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"math"
+	"time"
+)
+
+// Config is used to tune the Smux session
+type Config struct {
+	// SMUX Protocol version, support 1,2
+	Version int
+
+	// Disabled keepalive
+	KeepAliveDisabled bool
+
+	// KeepAliveInterval is how often to send a NOP command to the remote
+	KeepAliveInterval time.Duration
+
+	// KeepAliveTimeout is how long the session
+	// will be closed if no data has arrived
+	KeepAliveTimeout time.Duration
+
+	// MaxFrameSize is used to control the maximum
+	// frame size to sent to the remote
+	MaxFrameSize int
+
+	// MaxReceiveBuffer is used to control the maximum
+	// number of data in the buffer pool
+	MaxReceiveBuffer int
+
+	// MaxStreamBuffer is used to control the maximum
+	// number of data per stream
+	MaxStreamBuffer int
+}
+
+// DefaultConfig is used to return a default configuration
+func DefaultConfig() *Config {
+	return &Config{
+		Version:           1,
+		KeepAliveInterval: 10 * time.Second,
+		KeepAliveTimeout:  30 * time.Second,
+		MaxFrameSize:      32768,
+		MaxReceiveBuffer:  4194304,
+		MaxStreamBuffer:   65536,
+	}
+}
+
+// VerifyConfig is used to verify the sanity of configuration
+func VerifyConfig(config *Config) error {
+	if !(config.Version == 1 || config.Version == 2) {
+		return errors.New("unsupported protocol version")
+	}
+	if !config.KeepAliveDisabled {
+		if config.KeepAliveInterval == 0 {
+			return errors.New("keep-alive interval must be positive")
+		}
+		if config.KeepAliveTimeout < config.KeepAliveInterval {
+			return fmt.Errorf("keep-alive timeout must be larger than keep-alive interval")
+		}
+	}
+	if config.MaxFrameSize <= 0 {
+		return errors.New("max frame size must be positive")
+	}
+	if config.MaxFrameSize > 65535 {
+		return errors.New("max frame size must not be larger than 65535")
+	}
+	if config.MaxReceiveBuffer <= 0 {
+		return errors.New("max receive buffer must be positive")
+	}
+	if config.MaxStreamBuffer <= 0 {
+		return errors.New("max stream buffer must be positive")
+	}
+	if config.MaxStreamBuffer > config.MaxReceiveBuffer {
+		return errors.New("max stream buffer must not be larger than max receive buffer")
+	}
+	if config.MaxStreamBuffer > math.MaxInt32 {
+		return errors.New("max stream buffer cannot be larger than 2147483647")
+	}
+	return nil
+}
+
+// Server is used to initialize a new server-side connection.
+func Server(conn io.ReadWriteCloser, config *Config) (*Session, error) {
+	if config == nil {
+		config = DefaultConfig()
+	}
+	if err := VerifyConfig(config); err != nil {
+		return nil, err
+	}
+	return newSession(config, conn, false), nil
+}
+
+// Client is used to initialize a new client-side connection.
+func Client(conn io.ReadWriteCloser, config *Config) (*Session, error) {
+	if config == nil {
+		config = DefaultConfig()
+	}
+
+	if err := VerifyConfig(config); err != nil {
+		return nil, err
+	}
+	return newSession(config, conn, true), nil
+}

pkg/smux/session.go

@@ -0,0 +1,621 @@
+// MIT License
+//
+// Copyright (c) 2016-2017 xtaci
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package smux
+
+import (
+	"container/heap"
+	"encoding/binary"
+	"errors"
+	"io"
+	"net"
+	"runtime"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/nadoo/glider/pkg/pool"
+)
+
+const (
+	defaultAcceptBacklog = 1024
+	maxShaperSize        = 1024
+	openCloseTimeout     = 30 * time.Second // Timeout for opening/closing streams
+)
+
+// CLASSID represents the class of a frame
+type CLASSID int
+
+const (
+	CLSCTRL CLASSID = iota // prioritized control signal
+	CLSDATA
+)
+
+// timeoutError representing timeouts for operations such as accept, read and write
+//
+// To better cooperate with the standard library, timeoutError should implement the standard library's `net.Error`.
+//
+// For example, using smux to implement net.Listener and work with http.Server, the keep-alive connection (*smux.Stream) will be unexpectedly closed.
+// For more details, see https://github.com/xtaci/smux/pull/99.
+type timeoutError struct{}
+
+func (timeoutError) Error() string   { return "timeout" }
+func (timeoutError) Temporary() bool { return true }
+func (timeoutError) Timeout() bool   { return true }
+
+var (
+	ErrInvalidProtocol           = errors.New("invalid protocol")
+	ErrConsumed                  = errors.New("peer consumed more than sent")
+	ErrGoAway                    = errors.New("stream id overflows, should start a new connection")
+	ErrTimeout         net.Error = &timeoutError{}
+	ErrWouldBlock                = errors.New("operation would block on IO")
+)
+
+// writeRequest represents a request to write a frame
+type writeRequest struct {
+	class  CLASSID
+	frame  Frame
+	seq    uint32
+	result chan writeResult
+}
+
+// writeResult represents the result of a write request
+type writeResult struct {
+	n   int
+	err error
+}
+
+// Session defines a multiplexed connection for streams
+type Session struct {
+	conn io.ReadWriteCloser
+
+	config           *Config
+	nextStreamID     uint32 // next stream identifier
+	nextStreamIDLock sync.Mutex
+
+	bucket       int32         // token bucket
+	bucketNotify chan struct{} // used for waiting for tokens
+
+	streams    map[uint32]*stream // all streams in this session
+	streamLock sync.Mutex         // locks streams
+
+	die     chan struct{} // flag session has died
+	dieOnce sync.Once
+
+	// socket error handling
+	socketReadError      atomic.Value
+	socketWriteError     atomic.Value
+	chSocketReadError    chan struct{}
+	chSocketWriteError   chan struct{}
+	socketReadErrorOnce  sync.Once
+	socketWriteErrorOnce sync.Once
+
+	// smux protocol errors
+	protoError     atomic.Value
+	chProtoError   chan struct{}
+	protoErrorOnce sync.Once
+
+	chAccepts chan *stream
+
+	dataReady int32 // flag data has arrived
+
+	goAway int32 // flag id exhausted
+
+	deadline atomic.Value
+
+	requestID uint32            // Monotonic increasing write request ID
+	shaper    chan writeRequest // a shaper for writing
+	writes    chan writeRequest
+}
+
+func newSession(config *Config, conn io.ReadWriteCloser, client bool) *Session {
+	s := new(Session)
+	s.die = make(chan struct{})
+	s.conn = conn
+	s.config = config
+	s.streams = make(map[uint32]*stream)
+	s.chAccepts = make(chan *stream, defaultAcceptBacklog)
+	s.bucket = int32(config.MaxReceiveBuffer)
+	s.bucketNotify = make(chan struct{}, 1)
+	s.shaper = make(chan writeRequest)
+	s.writes = make(chan writeRequest)
+	s.chSocketReadError = make(chan struct{})
+	s.chSocketWriteError = make(chan struct{})
+	s.chProtoError = make(chan struct{})
+
+	if client {
+		s.nextStreamID = 1
+	} else {
+		s.nextStreamID = 0
+	}
+
+	go s.shaperLoop()
+	go s.recvLoop()
+	go s.sendLoop()
+	if !config.KeepAliveDisabled {
+		go s.keepalive()
+	}
+	return s
+}
+
+// OpenStream is used to create a new stream
+func (s *Session) OpenStream() (*Stream, error) {
+	if s.IsClosed() {
+		return nil, io.ErrClosedPipe
+	}
+
+	// generate stream id
+	s.nextStreamIDLock.Lock()
+	if s.goAway > 0 {
+		s.nextStreamIDLock.Unlock()
+		return nil, ErrGoAway
+	}
+
+	s.nextStreamID += 2
+	sid := s.nextStreamID
+	if sid == sid%2 { // stream-id overflows
+		s.goAway = 1
+		s.nextStreamIDLock.Unlock()
+		return nil, ErrGoAway
+	}
+	s.nextStreamIDLock.Unlock()
+
+	stream := newStream(sid, s.config.MaxFrameSize, s)
+
+	if _, err := s.writeControlFrame(newFrame(byte(s.config.Version), cmdSYN, sid)); err != nil {
+		return nil, err
+	}
+
+	s.streamLock.Lock()
+	defer s.streamLock.Unlock()
+	select {
+	case <-s.chSocketReadError:
+		return nil, s.socketReadError.Load().(error)
+	case <-s.chSocketWriteError:
+		return nil, s.socketWriteError.Load().(error)
+	case <-s.die:
+		return nil, io.ErrClosedPipe
+	default:
+		s.streams[sid] = stream
+		wrapper := &Stream{stream: stream}
+		// NOTE(x): disabled finalizer for issue #997
+		/*
+			runtime.SetFinalizer(wrapper, func(s *Stream) {
+				s.Close()
+			})
+		*/
+		return wrapper, nil
+	}
+}
+
+// Open returns a generic ReadWriteCloser
+func (s *Session) Open() (io.ReadWriteCloser, error) {
+	return s.OpenStream()
+}
+
+// AcceptStream is used to block until the next available stream
+// is ready to be accepted.
+func (s *Session) AcceptStream() (*Stream, error) {
+	var deadline <-chan time.Time
+	if d, ok := s.deadline.Load().(time.Time); ok && !d.IsZero() {
+		timer := time.NewTimer(time.Until(d))
+		defer timer.Stop()
+		deadline = timer.C
+	}
+
+	select {
+	case stream := <-s.chAccepts:
+		wrapper := &Stream{stream: stream}
+		runtime.SetFinalizer(wrapper, func(s *Stream) {
+			s.Close()
+		})
+		return wrapper, nil
+	case <-deadline:
+		return nil, ErrTimeout
+	case <-s.chSocketReadError:
+		return nil, s.socketReadError.Load().(error)
+	case <-s.chProtoError:
+		return nil, s.protoError.Load().(error)
+	case <-s.die:
+		return nil, io.ErrClosedPipe
+	}
+}
+
+// Accept Returns a generic ReadWriteCloser instead of smux.Stream
+func (s *Session) Accept() (io.ReadWriteCloser, error) {
+	return s.AcceptStream()
+}
+
+// Close is used to close the session and all streams.
+func (s *Session) Close() error {
+	var once bool
+	s.dieOnce.Do(func() {
+		close(s.die)
+		once = true
+	})
+
+	if once {
+		s.streamLock.Lock()
+		for k := range s.streams {
+			s.streams[k].sessionClose()
+		}
+		s.streamLock.Unlock()
+		return s.conn.Close()
+	} else {
+		return io.ErrClosedPipe
+	}
+}
+
+// CloseChan can be used by someone who wants to be notified immediately when this
+// session is closed
+func (s *Session) CloseChan() <-chan struct{} {
+	return s.die
+}
+
+// notifyBucket notifies recvLoop that bucket is available
+func (s *Session) notifyBucket() {
+	select {
+	case s.bucketNotify <- struct{}{}:
+	default:
+	}
+}
+
+func (s *Session) notifyReadError(err error) {
+	s.socketReadErrorOnce.Do(func() {
+		s.socketReadError.Store(err)
+		close(s.chSocketReadError)
+	})
+}
+
+func (s *Session) notifyWriteError(err error) {
+	s.socketWriteErrorOnce.Do(func() {
+		s.socketWriteError.Store(err)
+		close(s.chSocketWriteError)
+	})
+}
+
+func (s *Session) notifyProtoError(err error) {
+	s.protoErrorOnce.Do(func() {
+		s.protoError.Store(err)
+		close(s.chProtoError)
+	})
+}
+
+// IsClosed does a safe check to see if we have shutdown
+func (s *Session) IsClosed() bool {
+	select {
+	case <-s.die:
+		return true
+	default:
+		return false
+	}
+}
+
+// NumStreams returns the number of currently open streams
+func (s *Session) NumStreams() int {
+	if s.IsClosed() {
+		return 0
+	}
+	s.streamLock.Lock()
+	defer s.streamLock.Unlock()
+	return len(s.streams)
+}
+
+// SetDeadline sets a deadline used by Accept* calls.
+// A zero time value disables the deadline.
+func (s *Session) SetDeadline(t time.Time) error {
+	s.deadline.Store(t)
+	return nil
+}
+
+// LocalAddr satisfies net.Conn interface
+func (s *Session) LocalAddr() net.Addr {
+	if ts, ok := s.conn.(interface {
+		LocalAddr() net.Addr
+	}); ok {
+		return ts.LocalAddr()
+	}
+	return nil
+}
+
+// RemoteAddr satisfies net.Conn interface
+func (s *Session) RemoteAddr() net.Addr {
+	if ts, ok := s.conn.(interface {
+		RemoteAddr() net.Addr
+	}); ok {
+		return ts.RemoteAddr()
+	}
+	return nil
+}
+
+// notify the session that a stream has closed
+func (s *Session) streamClosed(sid uint32) {
+	s.streamLock.Lock()
+	if stream, ok := s.streams[sid]; ok {
+		n := stream.recycleTokens()
+		if n > 0 { // return remaining tokens to the bucket
+			if atomic.AddInt32(&s.bucket, int32(n)) > 0 {
+				s.notifyBucket()
+			}
+		}
+		delete(s.streams, sid)
+	}
+	s.streamLock.Unlock()
+}
+
+// returnTokens is called by stream to return token after read
+func (s *Session) returnTokens(n int) {
+	if atomic.AddInt32(&s.bucket, int32(n)) > 0 {
+		s.notifyBucket()
+	}
+}
+
+// recvLoop keeps on reading from underlying connection if tokens are available
+func (s *Session) recvLoop() {
+	var hdr rawHeader
+	var updHdr updHeader
+
+	for {
+		for atomic.LoadInt32(&s.bucket) <= 0 && !s.IsClosed() {
+			select {
+			case <-s.bucketNotify:
+			case <-s.die:
+				return
+			}
+		}
+
+		// read header first
+		if _, err := io.ReadFull(s.conn, hdr[:]); err == nil {
+			atomic.StoreInt32(&s.dataReady, 1)
+			if hdr.Version() != byte(s.config.Version) {
+				s.notifyProtoError(ErrInvalidProtocol)
+				return
+			}
+			sid := hdr.StreamID()
+			switch hdr.Cmd() {
+			case cmdNOP:
+			case cmdSYN: // stream opening
+				s.streamLock.Lock()
+				if _, ok := s.streams[sid]; !ok {
+					stream := newStream(sid, s.config.MaxFrameSize, s)
+					s.streams[sid] = stream
+					select {
+					case s.chAccepts <- stream:
+					case <-s.die:
+					}
+				}
+				s.streamLock.Unlock()
+			case cmdFIN: // stream closing
+				s.streamLock.Lock()
+				if stream, ok := s.streams[sid]; ok {
+					stream.fin()
+					stream.notifyReadEvent()
+				}
+				s.streamLock.Unlock()
+			case cmdPSH: // data frame
+				if hdr.Length() > 0 {
+					newbuf := pool.GetBuffer(int(hdr.Length()))
+					if written, err := io.ReadFull(s.conn, newbuf); err == nil {
+						s.streamLock.Lock()
+						if stream, ok := s.streams[sid]; ok {
+							stream.pushBytes(newbuf)
+							// a stream used some token
+							atomic.AddInt32(&s.bucket, -int32(written))
+							stream.notifyReadEvent()
+						} else {
+							// data directed to a missing/closed stream, recycle the buffer immediately.
+							pool.PutBuffer(newbuf)
+						}
+						s.streamLock.Unlock()
+					} else {
+						s.notifyReadError(err)
+						return
+					}
+				}
+			case cmdUPD: // a window update signal
+				if _, err := io.ReadFull(s.conn, updHdr[:]); err == nil {
+					s.streamLock.Lock()
+					if stream, ok := s.streams[sid]; ok {
+						stream.update(updHdr.Consumed(), updHdr.Window())
+					}
+					s.streamLock.Unlock()
+				} else {
+					s.notifyReadError(err)
+					return
+				}
+			default:
+				s.notifyProtoError(ErrInvalidProtocol)
+				return
+			}
+		} else {
+			s.notifyReadError(err)
+			return
+		}
+	}
+}
+
+// keepalive sends NOP frame to peer to keep the connection alive, and detect dead peers
+func (s *Session) keepalive() {
+	tickerPing := time.NewTicker(s.config.KeepAliveInterval)
+	tickerTimeout := time.NewTicker(s.config.KeepAliveTimeout)
+	defer tickerPing.Stop()
+	defer tickerTimeout.Stop()
+	for {
+		select {
+		case <-tickerPing.C:
+			s.writeFrameInternal(newFrame(byte(s.config.Version), cmdNOP, 0), tickerPing.C, CLSCTRL)
+			s.notifyBucket() // force a signal to the recvLoop
+		case <-tickerTimeout.C:
+			if !atomic.CompareAndSwapInt32(&s.dataReady, 1, 0) {
+				// recvLoop may block while bucket is 0, in this case,
+				// session should not be closed.
+				if atomic.LoadInt32(&s.bucket) > 0 {
+					s.Close()
+					return
+				}
+			}
+		case <-s.die:
+			return
+		}
+	}
+}
+
+// shaperLoop implements a priority queue for write requests,
+// some control messages are prioritized over data messages
+func (s *Session) shaperLoop() {
+	var reqs shaperHeap
+	var next writeRequest
+	var chWrite chan writeRequest
+	var chShaper chan writeRequest
+
+	for {
+		// chWrite is not available until it has packet to send
+		if len(reqs) > 0 {
+			chWrite = s.writes
+			next = heap.Pop(&reqs).(writeRequest)
+		} else {
+			chWrite = nil
+		}
+
+		// control heap size, chShaper is not available until packets are less than maximum allowed
+		if len(reqs) >= maxShaperSize {
+			chShaper = nil
+		} else {
+			chShaper = s.shaper
+		}
+
+		// assertion on non nil
+		if chShaper == nil && chWrite == nil {
+			panic("both channel are nil")
+		}
+
+		select {
+		case <-s.die:
+			return
+		case r := <-chShaper:
+			if chWrite != nil { // next is valid, reshape
+				heap.Push(&reqs, next)
+			}
+			heap.Push(&reqs, r)
+		case chWrite <- next:
+		}
+	}
+}
+
+// sendLoop sends frames to the underlying connection
+func (s *Session) sendLoop() {
+	var buf []byte
+	var n int
+	var err error
+	var vec [][]byte // vector for writeBuffers
+
+	bw, ok := s.conn.(interface {
+		WriteBuffers(v [][]byte) (n int, err error)
+	})
+
+	if ok {
+		buf = make([]byte, headerSize)
+		vec = make([][]byte, 2)
+	} else {
+		buf = make([]byte, (1<<16)+headerSize)
+	}
+
+	for {
+		select {
+		case <-s.die:
+			return
+		case request := <-s.writes:
+			buf[0] = request.frame.ver
+			buf[1] = request.frame.cmd
+			binary.LittleEndian.PutUint16(buf[2:], uint16(len(request.frame.data)))
+			binary.LittleEndian.PutUint32(buf[4:], request.frame.sid)
+
+			// support for scatter-gather I/O
+			if len(vec) > 0 {
+				vec[0] = buf[:headerSize]
+				vec[1] = request.frame.data
+				n, err = bw.WriteBuffers(vec)
+			} else {
+				copy(buf[headerSize:], request.frame.data)
+				n, err = s.conn.Write(buf[:headerSize+len(request.frame.data)])
+			}
+
+			n -= headerSize
+			if n < 0 {
+				n = 0
+			}
+
+			result := writeResult{
+				n:   n,
+				err: err,
+			}
+
+			request.result <- result
+			close(request.result)
+
+			// store conn error
+			if err != nil {
+				s.notifyWriteError(err)
+				return
+			}
+		}
+	}
+}
+
+// writeControlFrame writes the control frame to the underlying connection
+// and returns the number of bytes written if successful
+func (s *Session) writeControlFrame(f Frame) (n int, err error) {
+	timer := time.NewTimer(openCloseTimeout)
+	defer timer.Stop()
+
+	return s.writeFrameInternal(f, timer.C, CLSCTRL)
+}
+
+// internal writeFrame version to support deadline used in keepalive
+func (s *Session) writeFrameInternal(f Frame, deadline <-chan time.Time, class CLASSID) (int, error) {
+	req := writeRequest{
+		class:  class,
+		frame:  f,
+		seq:    atomic.AddUint32(&s.requestID, 1),
+		result: make(chan writeResult, 1),
+	}
+	select {
+	case s.shaper <- req:
+	case <-s.die:
+		return 0, io.ErrClosedPipe
+	case <-s.chSocketWriteError:
+		return 0, s.socketWriteError.Load().(error)
+	case <-deadline:
+		return 0, ErrTimeout
+	}
+
+	select {
+	case result := <-req.result:
+		return result.n, result.err
+	case <-s.die:
+		return 0, io.ErrClosedPipe
+	case <-s.chSocketWriteError:
+		return 0, s.socketWriteError.Load().(error)
+	case <-deadline:
+		return 0, ErrTimeout
+	}
+}

pkg/smux/shaper.go

@@ -0,0 +1,56 @@
+// MIT License
+//
+// Copyright (c) 2016-2017 xtaci
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package smux
+
+// _itimediff returns the time difference between two uint32 values.
+// The result is a signed 32-bit integer representing the difference between 'later' and 'earlier'.
+func _itimediff(later, earlier uint32) int32 {
+	return (int32)(later - earlier)
+}
+
+// shaperHeap is a min-heap of writeRequest.
+// It orders writeRequests by class first, then by sequence number within the same class.
+type shaperHeap []writeRequest
+
+func (h shaperHeap) Len() int { return len(h) }
+
+// Less determines the ordering of elements in the heap.
+// Requests are ordered by their class first. If two requests have the same class,
+// they are ordered by their sequence numbers.
+func (h shaperHeap) Less(i, j int) bool {
+	if h[i].class != h[j].class {
+		return h[i].class < h[j].class
+	}
+	return _itimediff(h[j].seq, h[i].seq) > 0
+}
+
+func (h shaperHeap) Swap(i, j int)       { h[i], h[j] = h[j], h[i] }
+func (h *shaperHeap) Push(x interface{}) { *h = append(*h, x.(writeRequest)) }
+
+func (h *shaperHeap) Pop() interface{} {
+	old := *h
+	n := len(old)
+	x := old[n-1]
+	*h = old[0 : n-1]
+	return x
+}

pkg/smux/stream.go

@@ -0,0 +1,615 @@
+// MIT License
+//
+// Copyright (c) 2016-2017 xtaci
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package smux
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/nadoo/glider/pkg/pool"
+)
+
+// wrapper for GC
+type Stream struct {
+	*stream
+}
+
+// Stream implements net.Conn
+type stream struct {
+	id   uint32 // Stream identifier
+	sess *Session
+
+	buffers [][]byte // the sequential buffers of stream
+	heads   [][]byte // slice heads of the buffers above, kept for recycle
+
+	bufferLock sync.Mutex // Mutex to protect access to buffers
+	frameSize  int        // Maximum frame size for the stream
+
+	// notify a read event
+	chReadEvent chan struct{}
+
+	// flag the stream has closed
+	die     chan struct{}
+	dieOnce sync.Once // Ensures die channel is closed only once
+
+	// FIN command
+	chFinEvent   chan struct{}
+	finEventOnce sync.Once // Ensures chFinEvent is closed only once
+
+	// deadlines
+	readDeadline  atomic.Value
+	writeDeadline atomic.Value
+
+	// per stream sliding window control
+	numRead    uint32 // count num of bytes read
+	numWritten uint32 // count num of bytes written
+	incr       uint32 // bytes sent since last window update
+
+	// UPD command
+	peerConsumed uint32        // num of bytes the peer has consumed
+	peerWindow   uint32        // peer window, initialized to 256KB, updated by peer
+	chUpdate     chan struct{} // notify of remote data consuming and window update
+}
+
+// newStream initializes and returns a new Stream.
+func newStream(id uint32, frameSize int, sess *Session) *stream {
+	s := new(stream)
+	s.id = id
+	s.chReadEvent = make(chan struct{}, 1)
+	s.chUpdate = make(chan struct{}, 1)
+	s.frameSize = frameSize
+	s.sess = sess
+	s.die = make(chan struct{})
+	s.chFinEvent = make(chan struct{})
+	s.peerWindow = initialPeerWindow // set to initial window size
+
+	return s
+}
+
+// ID returns the stream's unique identifier.
+func (s *stream) ID() uint32 {
+	return s.id
+}
+
+// Read reads data from the stream into the provided buffer.
+func (s *stream) Read(b []byte) (n int, err error) {
+	for {
+		n, err = s.tryRead(b)
+		if err == ErrWouldBlock {
+			if ew := s.waitRead(); ew != nil {
+				return 0, ew
+			}
+		} else {
+			return n, err
+		}
+	}
+}
+
+// tryRead attempts to read data from the stream without blocking.
+func (s *stream) tryRead(b []byte) (n int, err error) {
+	if s.sess.config.Version == 2 {
+		return s.tryReadv2(b)
+	}
+
+	if len(b) == 0 {
+		return 0, nil
+	}
+
+	// A critical section to copy data from buffers to
+	s.bufferLock.Lock()
+	if len(s.buffers) > 0 {
+		n = copy(b, s.buffers[0])
+		s.buffers[0] = s.buffers[0][n:]
+		if len(s.buffers[0]) == 0 {
+			s.buffers[0] = nil
+			s.buffers = s.buffers[1:]
+			// full recycle
+			pool.PutBuffer(s.heads[0])
+			s.heads = s.heads[1:]
+		}
+	}
+	s.bufferLock.Unlock()
+
+	if n > 0 {
+		s.sess.returnTokens(n)
+		return n, nil
+	}
+
+	select {
+	case <-s.die:
+		return 0, io.EOF
+	default:
+		return 0, ErrWouldBlock
+	}
+}
+
+// tryReadv2 is the non-blocking version of Read for version 2 streams.
+func (s *stream) tryReadv2(b []byte) (n int, err error) {
+	if len(b) == 0 {
+		return 0, nil
+	}
+
+	var notifyConsumed uint32
+	s.bufferLock.Lock()
+	if len(s.buffers) > 0 {
+		n = copy(b, s.buffers[0])
+		s.buffers[0] = s.buffers[0][n:]
+		if len(s.buffers[0]) == 0 {
+			s.buffers[0] = nil
+			s.buffers = s.buffers[1:]
+			// full recycle
+			pool.PutBuffer(s.heads[0])
+			s.heads = s.heads[1:]
+		}
+	}
+
+	// in an ideal environment:
+	// if more than half of buffer has consumed, send read ack to peer
+	// based on round-trip time of ACK, continous flowing data
+	// won't slow down due to waiting for ACK, as long as the
+	// consumer keeps on reading data.
+	//
+	// s.numRead == n implies that it's the initial reading
+	s.numRead += uint32(n)
+	s.incr += uint32(n)
+
+	// for initial reading, send window update
+	if s.incr >= uint32(s.sess.config.MaxStreamBuffer/2) || s.numRead == uint32(n) {
+		notifyConsumed = s.numRead
+		s.incr = 0 // reset couting for next window update
+	}
+	s.bufferLock.Unlock()
+
+	if n > 0 {
+		s.sess.returnTokens(n)
+
+		// send window update if necessary
+		if notifyConsumed > 0 {
+			err := s.sendWindowUpdate(notifyConsumed)
+			return n, err
+		} else {
+			return n, nil
+		}
+	}
+
+	select {
+	case <-s.die:
+		return 0, io.EOF
+	default:
+		return 0, ErrWouldBlock
+	}
+}
+
+// WriteTo implements io.WriteTo
+// WriteTo writes data to w until there's no more data to write or when an error occurs.
+// The return value n is the number of bytes written. Any error encountered during the write is also returned.
+// WriteTo calls Write in a loop until there is no more data to write or when an error occurs.
+// If the underlying stream is a v2 stream, it will send window update to peer when necessary.
+// If the underlying stream is a v1 stream, it will not send window update to peer.
+func (s *stream) WriteTo(w io.Writer) (n int64, err error) {
+	if s.sess.config.Version == 2 {
+		return s.writeTov2(w)
+	}
+
+	for {
+		var buf []byte
+		s.bufferLock.Lock()
+		if len(s.buffers) > 0 {
+			buf = s.buffers[0]
+			s.buffers = s.buffers[1:]
+			s.heads = s.heads[1:]
+		}
+		s.bufferLock.Unlock()
+
+		if buf != nil {
+			nw, ew := w.Write(buf)
+			// NOTE: WriteTo is a reader, so we need to return tokens here
+			s.sess.returnTokens(len(buf))
+			pool.PutBuffer(buf)
+			if nw > 0 {
+				n += int64(nw)
+			}
+
+			if ew != nil {
+				return n, ew
+			}
+		} else if ew := s.waitRead(); ew != nil {
+			return n, ew
+		}
+	}
+}
+
+// check comments in WriteTo
+func (s *stream) writeTov2(w io.Writer) (n int64, err error) {
+	for {
+		var notifyConsumed uint32
+		var buf []byte
+		s.bufferLock.Lock()
+		if len(s.buffers) > 0 {
+			buf = s.buffers[0]
+			s.buffers = s.buffers[1:]
+			s.heads = s.heads[1:]
+		}
+		s.numRead += uint32(len(buf))
+		s.incr += uint32(len(buf))
+		if s.incr >= uint32(s.sess.config.MaxStreamBuffer/2) || s.numRead == uint32(len(buf)) {
+			notifyConsumed = s.numRead
+			s.incr = 0
+		}
+		s.bufferLock.Unlock()
+
+		if buf != nil {
+			nw, ew := w.Write(buf)
+			// NOTE: WriteTo is a reader, so we need to return tokens here
+			s.sess.returnTokens(len(buf))
+			pool.PutBuffer(buf)
+			if nw > 0 {
+				n += int64(nw)
+			}
+
+			if ew != nil {
+				return n, ew
+			}
+
+			if notifyConsumed > 0 {
+				if err := s.sendWindowUpdate(notifyConsumed); err != nil {
+					return n, err
+				}
+			}
+		} else if ew := s.waitRead(); ew != nil {
+			return n, ew
+		}
+	}
+}
+
+// sendWindowUpdate sends a window update frame to the peer.
+func (s *stream) sendWindowUpdate(consumed uint32) error {
+	var timer *time.Timer
+	var deadline <-chan time.Time
+	if d, ok := s.readDeadline.Load().(time.Time); ok && !d.IsZero() {
+		timer = time.NewTimer(time.Until(d))
+		defer timer.Stop()
+		deadline = timer.C
+	}
+
+	frame := newFrame(byte(s.sess.config.Version), cmdUPD, s.id)
+	var hdr updHeader
+	binary.LittleEndian.PutUint32(hdr[:], consumed)
+	binary.LittleEndian.PutUint32(hdr[4:], uint32(s.sess.config.MaxStreamBuffer))
+	frame.data = hdr[:]
+	_, err := s.sess.writeFrameInternal(frame, deadline, CLSCTRL)
+	return err
+}
+
+// waitRead blocks until a read event occurs or a deadline is reached.
+func (s *stream) waitRead() error {
+	var timer *time.Timer
+	var deadline <-chan time.Time
+	if d, ok := s.readDeadline.Load().(time.Time); ok && !d.IsZero() {
+		timer = time.NewTimer(time.Until(d))
+		defer timer.Stop()
+		deadline = timer.C
+	}
+
+	select {
+	case <-s.chReadEvent: // notify some data has arrived, or closed
+		return nil
+	case <-s.chFinEvent:
+		// BUGFIX(xtaci): Fix for https://github.com/xtaci/smux/issues/82
+		s.bufferLock.Lock()
+		defer s.bufferLock.Unlock()
+		if len(s.buffers) > 0 {
+			return nil
+		}
+		return io.EOF
+	case <-s.sess.chSocketReadError:
+		return s.sess.socketReadError.Load().(error)
+	case <-s.sess.chProtoError:
+		return s.sess.protoError.Load().(error)
+	case <-deadline:
+		return ErrTimeout
+	case <-s.die:
+		return io.ErrClosedPipe
+	}
+
+}
+
+// Write implements net.Conn
+//
+// Note that the behavior when multiple goroutines write concurrently is not deterministic,
+// frames may interleave in random way.
+func (s *stream) Write(b []byte) (n int, err error) {
+	if s.sess.config.Version == 2 {
+		return s.writeV2(b)
+	}
+
+	var deadline <-chan time.Time
+	if d, ok := s.writeDeadline.Load().(time.Time); ok && !d.IsZero() {
+		timer := time.NewTimer(time.Until(d))
+		defer timer.Stop()
+		deadline = timer.C
+	}
+
+	// check if stream has closed
+	select {
+	case <-s.chFinEvent: // passive closing
+		return 0, io.EOF
+	case <-s.die:
+		return 0, io.ErrClosedPipe
+	default:
+	}
+
+	// frame split and transmit
+	sent := 0
+	frame := newFrame(byte(s.sess.config.Version), cmdPSH, s.id)
+	bts := b
+	for len(bts) > 0 {
+		sz := len(bts)
+		if sz > s.frameSize {
+			sz = s.frameSize
+		}
+		frame.data = bts[:sz]
+		bts = bts[sz:]
+		n, err := s.sess.writeFrameInternal(frame, deadline, CLSDATA)
+		s.numWritten++
+		sent += n
+		if err != nil {
+			return sent, err
+		}
+	}
+
+	return sent, nil
+}
+
+// writeV2 writes data to the stream for version 2 streams.
+func (s *stream) writeV2(b []byte) (n int, err error) {
+	// check empty input
+	if len(b) == 0 {
+		return 0, nil
+	}
+
+	// check if stream has closed
+	select {
+	case <-s.chFinEvent:
+		return 0, io.EOF
+	case <-s.die:
+		return 0, io.ErrClosedPipe
+	default:
+	}
+
+	// create write deadline timer
+	var deadline <-chan time.Time
+	if d, ok := s.writeDeadline.Load().(time.Time); ok && !d.IsZero() {
+		timer := time.NewTimer(time.Until(d))
+		defer timer.Stop()
+		deadline = timer.C
+	}
+
+	// frame split and transmit process
+	sent := 0
+	frame := newFrame(byte(s.sess.config.Version), cmdPSH, s.id)
+
+	for {
+		// per stream sliding window control
+		// [.... [consumed... numWritten] ... win... ]
+		// [.... [consumed...................+rmtwnd]]
+		var bts []byte
+		// note:
+		// even if uint32 overflow, this math still works:
+		// eg1: uint32(0) - uint32(math.MaxUint32) = 1
+		// eg2: int32(uint32(0) - uint32(1)) = -1
+		//
+		// basicially, you can take it as a MODULAR ARITHMETIC
+		inflight := int32(atomic.LoadUint32(&s.numWritten) - atomic.LoadUint32(&s.peerConsumed))
+		if inflight < 0 { // security check for malformed data
+			return 0, ErrConsumed
+		}
+
+		// make sure you understand 'win' is calculated in modular arithmetic(2^32(4GB))
+		win := int32(atomic.LoadUint32(&s.peerWindow)) - inflight
+
+		if win > 0 {
+			// determine how many bytes to send
+			if win > int32(len(b)) {
+				bts = b
+				b = nil
+			} else {
+				bts = b[:win]
+				b = b[win:]
+			}
+
+			// frame split and transmit
+			for len(bts) > 0 {
+				// splitting frame
+				sz := len(bts)
+				if sz > s.frameSize {
+					sz = s.frameSize
+				}
+				frame.data = bts[:sz]
+				bts = bts[sz:]
+
+				// transmit of frame
+				n, err := s.sess.writeFrameInternal(frame, deadline, CLSDATA)
+				atomic.AddUint32(&s.numWritten, uint32(sz))
+				sent += n
+				if err != nil {
+					return sent, err
+				}
+			}
+		}
+
+		// if there is any data left to be sent,
+		// wait until stream closes, window changes or deadline reached
+		// this blocking behavior will back propagate flow control to upper layer.
+		if len(b) > 0 {
+			select {
+			case <-s.chFinEvent:
+				return 0, io.EOF
+			case <-s.die:
+				return sent, io.ErrClosedPipe
+			case <-deadline:
+				return sent, ErrTimeout
+			case <-s.sess.chSocketWriteError:
+				return sent, s.sess.socketWriteError.Load().(error)
+			case <-s.chUpdate: // notify of remote data consuming and window update
+				continue
+			}
+		} else {
+			return sent, nil
+		}
+	}
+}
+
+// Close implements net.Conn
+func (s *stream) Close() error {
+	var once bool
+	var err error
+	s.dieOnce.Do(func() {
+		close(s.die)
+		once = true
+	})
+
+	if once {
+		// send FIN in order
+		f := newFrame(byte(s.sess.config.Version), cmdFIN, s.id)
+
+		timer := time.NewTimer(openCloseTimeout)
+		defer timer.Stop()
+
+		_, err = s.sess.writeFrameInternal(f, timer.C, CLSDATA)
+		s.sess.streamClosed(s.id)
+		return err
+	} else {
+		return io.ErrClosedPipe
+	}
+}
+
+// GetDieCh returns a readonly chan which can be readable
+// when the stream is to be closed.
+func (s *stream) GetDieCh() <-chan struct{} {
+	return s.die
+}
+
+// SetReadDeadline sets the read deadline as defined by
+// net.Conn.SetReadDeadline.
+// A zero time value disables the deadline.
+func (s *stream) SetReadDeadline(t time.Time) error {
+	s.readDeadline.Store(t)
+	s.notifyReadEvent()
+	return nil
+}
+
+// SetWriteDeadline sets the write deadline as defined by
+// net.Conn.SetWriteDeadline.
+// A zero time value disables the deadline.
+func (s *stream) SetWriteDeadline(t time.Time) error {
+	s.writeDeadline.Store(t)
+	return nil
+}
+
+// SetDeadline sets both read and write deadlines as defined by
+// net.Conn.SetDeadline.
+// A zero time value disables the deadlines.
+func (s *stream) SetDeadline(t time.Time) error {
+	if err := s.SetReadDeadline(t); err != nil {
+		return err
+	}
+	if err := s.SetWriteDeadline(t); err != nil {
+		return err
+	}
+	return nil
+}
+
+// session closes
+func (s *stream) sessionClose() { s.dieOnce.Do(func() { close(s.die) }) }
+
+// LocalAddr satisfies net.Conn interface
+func (s *stream) LocalAddr() net.Addr {
+	if ts, ok := s.sess.conn.(interface {
+		LocalAddr() net.Addr
+	}); ok {
+		return ts.LocalAddr()
+	}
+	return nil
+}
+
+// RemoteAddr satisfies net.Conn interface
+func (s *stream) RemoteAddr() net.Addr {
+	if ts, ok := s.sess.conn.(interface {
+		RemoteAddr() net.Addr
+	}); ok {
+		return ts.RemoteAddr()
+	}
+	return nil
+}
+
+// pushBytes append buf to buffers
+func (s *stream) pushBytes(buf []byte) (written int, err error) {
+	s.bufferLock.Lock()
+	s.buffers = append(s.buffers, buf)
+	s.heads = append(s.heads, buf)
+	s.bufferLock.Unlock()
+	return
+}
+
+// recycleTokens transform remaining bytes to tokens(will truncate buffer)
+func (s *stream) recycleTokens() (n int) {
+	s.bufferLock.Lock()
+	for k := range s.buffers {
+		n += len(s.buffers[k])
+		pool.PutBuffer(s.heads[k])
+	}
+	s.buffers = nil
+	s.heads = nil
+	s.bufferLock.Unlock()
+	return
+}
+
+// notify read event
+func (s *stream) notifyReadEvent() {
+	select {
+	case s.chReadEvent <- struct{}{}:
+	default:
+	}
+}
+
+// update command
+func (s *stream) update(consumed uint32, window uint32) {
+	atomic.StoreUint32(&s.peerConsumed, consumed)
+	atomic.StoreUint32(&s.peerWindow, window)
+	select {
+	case s.chUpdate <- struct{}{}:
+	default:
+	}
+}
+
+// mark this stream has been closed in protocol
+func (s *stream) fin() {
+	s.finEventOnce.Do(func() {
+		close(s.chFinEvent)
+	})
+}

pkg/sockopt/sockopt.go

@@ -0,0 +1,31 @@
+package sockopt
+
+import (
+	"net"
+	"syscall"
+)
+
+// Options is the options struct.
+type Options struct {
+	bindIface *net.Interface
+	reuseAddr bool
+}
+
+// Option is the function paramater.
+type Option func(opts *Options)
+
+// Bind sets the bind interface option.
+func Bind(intf *net.Interface) Option { return func(opts *Options) { opts.bindIface = intf } }
+
+// ReuseAddr sets the reuse addr option.
+func ReuseAddr() Option { return func(opts *Options) { opts.reuseAddr = true } }
+
+// Control returns a control function for the net.Dialer and net.ListenConfig.
+func Control(opts ...Option) func(network, address string, c syscall.RawConn) error {
+	option := &Options{}
+	for _, opt := range opts {
+		opt(option)
+	}
+
+	return control(option)
+}

pkg/sockopt/sockopt_darwin.go

@@ -0,0 +1,28 @@
+package sockopt
+
+import (
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+func control(opt *Options) func(network, address string, c syscall.RawConn) error {
+	return func(network, address string, c syscall.RawConn) (err error) {
+		return c.Control(func(fd uintptr) {
+
+			if opt.bindIface != nil {
+				switch network {
+				case "tcp4", "udp4":
+					unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_BOUND_IF, opt.bindIface.Index)
+				case "tcp6", "udp6":
+					unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_BOUND_IF, opt.bindIface.Index)
+				}
+			}
+			if opt.reuseAddr {
+				unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
+				unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
+			}
+
+		})
+	}
+}

pkg/sockopt/sockopt_linux.go

@@ -0,0 +1,23 @@
+package sockopt
+
+import (
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+func control(opt *Options) func(network, address string, c syscall.RawConn) error {
+	return func(network, address string, c syscall.RawConn) (err error) {
+		return c.Control(func(fd uintptr) {
+
+			if opt.bindIface != nil {
+				unix.BindToDevice(int(fd), opt.bindIface.Name)
+			}
+			if opt.reuseAddr {
+				unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
+				unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
+			}
+
+		})
+	}
+}

pkg/sockopt/sockopt_others.go

@@ -0,0 +1,9 @@
+//go:build !linux && !darwin
+
+package sockopt
+
+import (
+	"syscall"
+)
+
+func control(opt *Options) func(string, string, syscall.RawConn) error { return nil }

pkg/socks/socks.go

@@ -0,0 +1,164 @@
+package socks
+
+import (
+	"errors"
+	"io"
+	"net"
+	"net/netip"
+	"strconv"
+)
+
+// SOCKS auth type
+const (
+	AuthNone     = 0
+	AuthPassword = 2
+)
+
+// SOCKS request commands as defined in RFC 1928 section 4
+const (
+	CmdError        byte = 0
+	CmdConnect      byte = 1
+	CmdBind         byte = 2
+	CmdUDPAssociate byte = 3
+)
+
+// SOCKS address types as defined in RFC 1928 section 5
+const (
+	ATypIP4    = 1
+	ATypDomain = 3
+	ATypIP6    = 4
+)
+
+// MaxAddrLen is the maximum size of SOCKS address in bytes
+const MaxAddrLen = 1 + 1 + 255 + 2
+
+// Errors are socks5 errors
+var Errors = []error{
+	errors.New(""),
+	errors.New("general failure"),
+	errors.New("connection forbidden"),
+	errors.New("network unreachable"),
+	errors.New("host unreachable"),
+	errors.New("connection refused"),
+	errors.New("TTL expired"),
+	errors.New("command not supported"),
+	errors.New("address type not supported"),
+	errors.New("socks5UDPAssociate"),
+}
+
+// Addr represents a SOCKS address as defined in RFC 1928 section 5.
+type Addr []byte
+
+// String serializes SOCKS address a to string form.
+func (a Addr) String() string {
+	var host, port string
+
+	switch a[0] { // address type
+	case ATypDomain:
+		host = string(a[2 : 2+int(a[1])])
+		port = strconv.Itoa((int(a[2+int(a[1])]) << 8) | int(a[2+int(a[1])+1]))
+	case ATypIP4:
+		host = net.IP(a[1 : 1+net.IPv4len]).String()
+		port = strconv.Itoa((int(a[1+net.IPv4len]) << 8) | int(a[1+net.IPv4len+1]))
+	case ATypIP6:
+		host = net.IP(a[1 : 1+net.IPv6len]).String()
+		port = strconv.Itoa((int(a[1+net.IPv6len]) << 8) | int(a[1+net.IPv6len+1]))
+	}
+
+	return net.JoinHostPort(host, port)
+}
+
+// Network returns network name. Implements net.Addr interface.
+func (a Addr) Network() string { return "socks" }
+
+// ReadAddr reads just enough bytes from r to get a valid Addr.
+func ReadAddr(r io.Reader) (Addr, error) {
+	b := make([]byte, MaxAddrLen)
+	_, err := io.ReadFull(r, b[:1]) // read 1st byte for address type
+	if err != nil {
+		return nil, err
+	}
+
+	switch b[0] {
+	case ATypDomain:
+		_, err = io.ReadFull(r, b[1:2]) // read 2nd byte for domain length
+		if err != nil {
+			return nil, err
+		}
+		_, err = io.ReadFull(r, b[2:2+int(b[1])+2])
+		return b[:1+1+int(b[1])+2], err
+	case ATypIP4:
+		_, err = io.ReadFull(r, b[1:1+net.IPv4len+2])
+		return b[:1+net.IPv4len+2], err
+	case ATypIP6:
+		_, err = io.ReadFull(r, b[1:1+net.IPv6len+2])
+		return b[:1+net.IPv6len+2], err
+	}
+
+	return nil, Errors[8]
+}
+
+// SplitAddr slices a SOCKS address from beginning of b. Returns nil if failed.
+func SplitAddr(b []byte) Addr {
+	addrLen := 1
+	if len(b) < addrLen {
+		return nil
+	}
+
+	switch b[0] {
+	case ATypDomain:
+		if len(b) < 2 {
+			return nil
+		}
+		addrLen = 1 + 1 + int(b[1]) + 2
+	case ATypIP4:
+		addrLen = 1 + net.IPv4len + 2
+	case ATypIP6:
+		addrLen = 1 + net.IPv6len + 2
+	default:
+		return nil
+	}
+
+	if len(b) < addrLen {
+		return nil
+	}
+
+	return b[:addrLen]
+}
+
+// ParseAddr parses the address in string s. Returns nil if failed.
+func ParseAddr(s string) Addr {
+	var addr Addr
+	host, port, err := net.SplitHostPort(s)
+	if err != nil {
+		return nil
+	}
+
+	if ip, err := netip.ParseAddr(host); err == nil {
+		if ip.Is4() {
+			addr = make([]byte, 1+net.IPv4len+2)
+			addr[0] = ATypIP4
+		} else {
+			addr = make([]byte, 1+net.IPv6len+2)
+			addr[0] = ATypIP6
+		}
+		copy(addr[1:], ip.AsSlice())
+	} else {
+		if len(host) > 255 {
+			return nil
+		}
+		addr = make([]byte, 1+1+len(host)+2)
+		addr[0] = ATypDomain
+		addr[1] = byte(len(host))
+		copy(addr[2:], host)
+	}
+
+	portnum, err := strconv.ParseUint(port, 10, 16)
+	if err != nil {
+		return nil
+	}
+
+	addr[len(addr)-2], addr[len(addr)-1] = byte(portnum>>8), byte(portnum)
+
+	return addr
+}

proxy/conn.go

@@ -0,0 +1,206 @@
+package proxy
+
+import (
+	"bufio"
+	"errors"
+	"io"
+	"net"
+	"os"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/nadoo/glider/pkg/pool"
+)
+
+var (
+	// TCPBufSize is the size of tcp buffer.
+	TCPBufSize = 32 << 10
+
+	// UDPBufSize is the size of udp buffer.
+	UDPBufSize = 2 << 10
+)
+
+// Conn is a connection with buffered reader.
+type Conn struct {
+	r *bufio.Reader
+	net.Conn
+}
+
+// NewConn returns a new conn.
+func NewConn(c net.Conn) *Conn {
+	if conn, ok := c.(*Conn); ok {
+		return conn
+	}
+	return &Conn{pool.GetBufReader(c), c}
+}
+
+// Reader returns the internal bufio.Reader.
+func (c *Conn) Reader() *bufio.Reader      { return c.r }
+func (c *Conn) Read(p []byte) (int, error) { return c.r.Read(p) }
+
+// Peek returns the next n bytes without advancing the reader.
+func (c *Conn) Peek(n int) ([]byte, error) { return c.r.Peek(n) }
+
+// WriteTo implements io.WriterTo.
+func (c *Conn) WriteTo(w io.Writer) (n int64, err error) { return c.r.WriteTo(w) }
+
+// Close closes the Conn.
+func (c *Conn) Close() error {
+	pool.PutBufReader(c.r)
+	return c.Conn.Close()
+}
+
+// Relay relays between left and right.
+func Relay(left, right net.Conn) error {
+	var err, err1 error
+	var wg sync.WaitGroup
+	var wait = 5 * time.Second
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		_, err1 = Copy(right, left)
+		right.SetReadDeadline(time.Now().Add(wait)) // unblock read on right
+	}()
+
+	_, err = Copy(left, right)
+	left.SetReadDeadline(time.Now().Add(wait)) // unblock read on left
+	wg.Wait()
+
+	if err1 != nil && !errors.Is(err1, os.ErrDeadlineExceeded) {
+		return err1
+	}
+
+	if err != nil && !errors.Is(err, os.ErrDeadlineExceeded) {
+		return err
+	}
+
+	return nil
+}
+
+// Copy copies from src to dst.
+func Copy(dst io.Writer, src io.Reader) (written int64, err error) {
+	dst = underlyingWriter(dst)
+	switch runtime.GOOS {
+	case "linux", "windows", "dragonfly", "freebsd", "solaris":
+		if _, ok := dst.(*net.TCPConn); ok && worthTry(src) {
+			if wt, ok := src.(io.WriterTo); ok {
+				return wt.WriteTo(dst)
+			}
+			if rt, ok := dst.(io.ReaderFrom); ok {
+				return rt.ReadFrom(src)
+			}
+		}
+	}
+	return CopyBuffer(dst, src)
+}
+
+func underlyingWriter(c io.Writer) io.Writer {
+	if wrap, ok := c.(*Conn); ok {
+		return wrap.Conn
+	}
+	return c
+}
+
+func worthTry(src io.Reader) bool {
+	switch v := src.(type) {
+	case *net.TCPConn, *net.UnixConn:
+		return true
+	case *io.LimitedReader:
+		return worthTry(v.R)
+	case *Conn:
+		return worthTry(v.Conn)
+	case *os.File:
+		fi, err := v.Stat()
+		if err != nil {
+			return false
+		}
+		return fi.Mode().IsRegular()
+	default:
+		return false
+	}
+}
+
+// CopyN copies n bytes (or until an error) from src to dst.
+func CopyN(dst io.Writer, src io.Reader, n int64) (written int64, err error) {
+	written, err = Copy(dst, io.LimitReader(src, n))
+	if written == n {
+		return n, nil
+	}
+	if written < n && err == nil {
+		// src stopped early; must have been EOF.
+		err = io.EOF
+	}
+	return
+}
+
+// CopyBuffer copies from src to dst with a userspace buffer.
+func CopyBuffer(dst io.Writer, src io.Reader) (written int64, err error) {
+	size := TCPBufSize
+	if l, ok := src.(*io.LimitedReader); ok && int64(size) > l.N {
+		if l.N < 1 {
+			size = 1
+		} else {
+			size = int(l.N)
+		}
+	}
+
+	buf := pool.GetBuffer(size)
+	defer pool.PutBuffer(buf)
+
+	for {
+		nr, er := src.Read(buf)
+		if nr > 0 {
+			nw, ew := dst.Write(buf[0:nr])
+			if nw > 0 {
+				written += int64(nw)
+			}
+			if ew != nil {
+				err = ew
+				break
+			}
+			if nr != nw {
+				err = io.ErrShortWrite
+				break
+			}
+		}
+		if er != nil {
+			if er != io.EOF {
+				err = er
+			}
+			break
+		}
+	}
+	return written, err
+}
+
+// CopyUDP copys from src to dst at target with read timeout.
+// if step sets to non-zero value,
+// the read timeout will be increased from 0 to timeout by step in every read operation.
+func CopyUDP(dst net.PacketConn, writeTo net.Addr, src net.PacketConn, timeout time.Duration, step time.Duration) error {
+	buf := pool.GetBuffer(UDPBufSize)
+	defer pool.PutBuffer(buf)
+
+	var t time.Duration
+	for {
+		if t += step; t == 0 || t > timeout {
+			t = timeout
+		}
+
+		src.SetReadDeadline(time.Now().Add(t))
+		n, addr, err := src.ReadFrom(buf)
+		if err != nil {
+			return err
+		}
+
+		if writeTo != nil {
+			addr = writeTo
+		}
+
+		_, err = dst.WriteTo(buf[:n], addr)
+		if err != nil {
+			return err
+		}
+	}
+}

proxy/dialer.go

@@ -0,0 +1,79 @@
+package proxy
+
+import (
+	"errors"
+	"net"
+	"sort"
+	"strings"
+)
+
+var (
+	// ErrNotSupported indicates that the operation is not supported
+	ErrNotSupported = errors.New("not supported")
+)
+
+// Dialer is used to create connection.
+type Dialer interface {
+	TCPDialer
+	UDPDialer
+}
+
+// TCPDialer is used to create tcp connection.
+type TCPDialer interface {
+	// Addr is the dialer's addr
+	Addr() string
+
+	// Dial connects to the given address
+	Dial(network, addr string) (c net.Conn, err error)
+}
+
+// UDPDialer is used to create udp PacketConn.
+type UDPDialer interface {
+	// Addr is the dialer's addr
+	Addr() string
+
+	// DialUDP connects to the given address
+	DialUDP(network, addr string) (pc net.PacketConn, err error)
+}
+
+// DialerCreator is a function to create dialers.
+type DialerCreator func(s string, dialer Dialer) (Dialer, error)
+
+var (
+	dialerCreators = make(map[string]DialerCreator)
+)
+
+// RegisterDialer is used to register a dialer.
+func RegisterDialer(name string, c DialerCreator) {
+	dialerCreators[strings.ToLower(name)] = c
+}
+
+// DialerFromURL calls the registered creator to create dialers.
+// dialer is the default upstream dialer so cannot be nil, we can use Default when calling this function.
+func DialerFromURL(s string, dialer Dialer) (Dialer, error) {
+	if dialer == nil {
+		return nil, errors.New("DialerFromURL: dialer cannot be nil")
+	}
+
+	if !strings.Contains(s, "://") {
+		s = s + "://"
+	}
+
+	scheme := s[:strings.Index(s, ":")]
+	c, ok := dialerCreators[strings.ToLower(scheme)]
+	if ok {
+		return c(s, dialer)
+	}
+
+	return nil, errors.New("unknown scheme '" + scheme + "'")
+}
+
+// DialerSchemes returns the registered dialer schemes.
+func DialerSchemes() string {
+	s := make([]string, 0, len(dialerCreators))
+	for name := range dialerCreators {
+		s = append(s, name)
+	}
+	sort.Strings(s)
+	return strings.Join(s, " ")
+}

proxy/direct.go

@@ -0,0 +1,151 @@
+package proxy
+
+import (
+	"context"
+	"errors"
+	"net"
+	"net/netip"
+	"time"
+
+	"github.com/nadoo/glider/pkg/sockopt"
+)
+
+// Direct proxy.
+type Direct struct {
+	iface        *net.Interface // interface specified by user
+	ip           net.IP
+	dialTimeout  time.Duration
+	relayTimeout time.Duration
+}
+
+func init() {
+	RegisterDialer("direct", NewDirectDialer)
+}
+
+// NewDirect returns a Direct dialer.
+func NewDirect(intface string, dialTimeout, relayTimeout time.Duration) (*Direct, error) {
+	d := &Direct{dialTimeout: dialTimeout, relayTimeout: relayTimeout}
+
+	if intface != "" {
+		if addr, err := netip.ParseAddr(intface); err == nil {
+			d.ip = addr.AsSlice()
+		} else {
+			iface, err := net.InterfaceByName(intface)
+			if err != nil {
+				return nil, errors.New(err.Error() + ": " + intface)
+			}
+			d.iface = iface
+		}
+	}
+
+	return d, nil
+}
+
+// NewDirectDialer returns a direct dialer.
+func NewDirectDialer(s string, d Dialer) (Dialer, error) {
+	if d == nil {
+		return NewDirect("", time.Duration(3)*time.Second, time.Duration(3)*time.Second)
+	}
+	return d, nil
+}
+
+// Addr returns forwarder's address.
+func (d *Direct) Addr() string { return "DIRECT" }
+
+// Dial connects to the address addr on the network net
+func (d *Direct) Dial(network, addr string) (c net.Conn, err error) {
+	if d.iface == nil || d.ip != nil {
+		c, err = d.dial(network, addr, d.ip)
+		if err == nil {
+			return
+		}
+	}
+
+	for _, ip := range d.IFaceIPs() {
+		c, err = d.dial(network, addr, ip)
+		if err == nil {
+			d.ip = ip
+			break
+		}
+	}
+
+	// no ip available (so no dials made), maybe the interface link is down
+	if c == nil && err == nil {
+		err = errors.New("dial failed, maybe the interface link is down, please check it")
+	}
+
+	return c, err
+}
+
+func (d *Direct) dial(network, addr string, localIP net.IP) (net.Conn, error) {
+	var la net.Addr
+	switch network {
+	case "tcp":
+		la = &net.TCPAddr{IP: localIP}
+	case "udp":
+		la = &net.UDPAddr{IP: localIP}
+	}
+
+	dialer := &net.Dialer{LocalAddr: la, Timeout: d.dialTimeout}
+	if d.iface != nil {
+		dialer.Control = sockopt.Control(sockopt.Bind(d.iface))
+	}
+
+	c, err := dialer.Dial(network, addr)
+	if err != nil {
+		return nil, err
+	}
+
+	if c, ok := c.(*net.TCPConn); ok {
+		c.SetKeepAlive(true)
+	}
+
+	if d.relayTimeout > 0 {
+		c.SetDeadline(time.Now().Add(d.relayTimeout))
+	}
+
+	return c, err
+}
+
+// DialUDP connects to the given address.
+func (d *Direct) DialUDP(network, addr string) (net.PacketConn, error) {
+	var la string
+	if d.ip != nil {
+		la = net.JoinHostPort(d.ip.String(), "0")
+	}
+
+	lc := &net.ListenConfig{}
+	if d.iface != nil {
+		lc.Control = sockopt.Control(sockopt.Bind(d.iface))
+	}
+
+	return lc.ListenPacket(context.Background(), network, la)
+}
+
+// IFaceIPs returns ip addresses according to the specified interface.
+func (d *Direct) IFaceIPs() (ips []net.IP) {
+	ipNets, err := d.iface.Addrs()
+	if err != nil {
+		return
+	}
+	for _, ipNet := range ipNets {
+		ips = append(ips, ipNet.(*net.IPNet).IP) //!ip.IsLinkLocalUnicast()
+	}
+	return
+}
+
+func init() {
+	AddUsage("direct", `
+Direct scheme:
+  direct://
+
+Only needed when you want to specify the outgoing interface:
+  glider -verbose -listen :8443 -forward direct://#interface=eth0
+
+Or load balance multiple interfaces directly:
+  glider -verbose -listen :8443 -forward direct://#interface=eth0 -forward direct://#interface=eth1 -strategy rr
+
+Or you can use the high availability mode:
+  glider -verbose -listen :8443 -forward direct://#interface=eth0&priority=100 -forward direct://#interface=eth1&priority=200 -strategy ha
+`)
+}

proxy/http/client.go

@@ -0,0 +1,82 @@
+package http
+
+import (
+	"encoding/base64"
+	"errors"
+	"net"
+	"net/textproto"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/proxy"
+)
+
+// NewHTTPDialer returns a http proxy dialer.
+func NewHTTPDialer(s string, d proxy.Dialer) (proxy.Dialer, error) {
+	return NewHTTP(s, d, nil)
+}
+
+// Addr returns forwarder's address.
+func (s *HTTP) Addr() string {
+	if s.addr == "" {
+		return s.dialer.Addr()
+	}
+	return s.addr
+}
+
+// Dial connects to the address addr on the network net via the proxy.
+func (s *HTTP) Dial(network, addr string) (net.Conn, error) {
+	rc, err := s.dialer.Dial(network, s.addr)
+	if err != nil {
+		log.F("[http] dial to %s error: %s", s.addr, err)
+		return nil, err
+	}
+
+	buf := pool.GetBytesBuffer()
+	defer pool.PutBytesBuffer(buf)
+
+	buf.WriteString("CONNECT " + addr + " HTTP/1.1\r\n")
+	buf.WriteString("Host: " + addr + "\r\n")
+	buf.WriteString("Proxy-Connection: Keep-Alive\r\n")
+
+	if s.user != "" && s.password != "" {
+		auth := s.user + ":" + s.password
+		buf.WriteString("Proxy-Authorization: Basic " + base64.StdEncoding.EncodeToString([]byte(auth)) + "\r\n")
+	}
+
+	// header ended
+	buf.WriteString("\r\n")
+	_, err = rc.Write(buf.Bytes())
+	if err != nil {
+		return nil, err
+	}
+
+	c := proxy.NewConn(rc)
+	tpr := textproto.NewReader(c.Reader())
+	line, err := tpr.ReadLine()
+	if err != nil {
+		return c, err
+	}
+
+	_, code, _, ok := parseStartLine(line)
+	if ok && code == "200" {
+		tpr.ReadMIMEHeader()
+		return c, err
+	}
+
+	switch code {
+	case "403":
+		log.F("[http] 'CONNECT' to ports other than 443 are not allowed by proxy %s", s.addr)
+	case "405":
+		log.F("[http] 'CONNECT' method not allowed by proxy %s", s.addr)
+	case "407":
+		log.F("[http] authencation needed by proxy %s", s.addr)
+	}
+
+	return nil, errors.New("[http] can not connect remote address: " + addr + ". error code: " + code)
+}
+
+// DialUDP connects to the given address via the proxy.
+func (s *HTTP) DialUDP(network, addr string) (pc net.PacketConn, err error) {
+	return nil, proxy.ErrNotSupported
+}

proxy/http/http.go

@@ -0,0 +1,121 @@
+// https://developer.mozilla.org/en-US/docs/Web/HTTP/Messages
+// NOTE: never keep-alive so the implementation can be much easier.
+
+// Package http implements a http proxy.
+package http
+
+import (
+	"encoding/base64"
+	"io"
+	"net/textproto"
+	"net/url"
+	"strings"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/proxy"
+)
+
+// HTTP struct.
+type HTTP struct {
+	dialer   proxy.Dialer
+	proxy    proxy.Proxy
+	addr     string
+	user     string
+	password string
+	pretend  bool
+}
+
+func init() {
+	proxy.RegisterDialer("http", NewHTTPDialer)
+	proxy.RegisterServer("http", NewHTTPServer)
+}
+
+// NewHTTP returns a http proxy.
+func NewHTTP(s string, d proxy.Dialer, p proxy.Proxy) (*HTTP, error) {
+	u, err := url.Parse(s)
+	if err != nil {
+		log.F("parse err: %s", err)
+		return nil, err
+	}
+
+	addr := u.Host
+	user := u.User.Username()
+	pass, _ := u.User.Password()
+
+	h := &HTTP{
+		dialer:   d,
+		proxy:    p,
+		addr:     addr,
+		user:     user,
+		password: pass,
+		pretend:  false,
+	}
+
+	if u.Query().Get("pretend") == "true" {
+		h.pretend = true
+	}
+
+	return h, nil
+}
+
+// parseStartLine parses "GET /foo HTTP/1.1" OR "HTTP/1.1 200 OK" into its three parts.
+func parseStartLine(line string) (r1, r2, r3 string, ok bool) {
+	s1 := strings.Index(line, " ")
+	s2 := strings.Index(line[s1+1:], " ")
+	if s1 < 0 || s2 < 0 {
+		return
+	}
+	s2 += s1 + 1
+	return line[:s1], line[s1+1 : s2], line[s2+1:], true
+}
+
+func cleanHeaders(header textproto.MIMEHeader) {
+	header.Del("Proxy-Connection")
+	header.Del("Connection")
+	header.Del("Keep-Alive")
+	header.Del("Proxy-Authenticate")
+	header.Del("Proxy-Authorization")
+	header.Del("TE")
+	header.Del("Trailers")
+	header.Del("Transfer-Encoding")
+	header.Del("Upgrade")
+}
+
+func writeStartLine(w io.Writer, s1, s2, s3 string) {
+	io.WriteString(w, s1+" "+s2+" "+s3+"\r\n")
+}
+
+func writeHeaders(w io.Writer, header textproto.MIMEHeader) {
+	for key, values := range header {
+		for _, v := range values {
+			io.WriteString(w, key+": "+v+"\r\n")
+		}
+	}
+	io.WriteString(w, "\r\n")
+}
+
+func extractUserPass(auth string) (username, password string, ok bool) {
+	if !strings.HasPrefix(auth, "Basic ") {
+		return
+	}
+
+	b, err := base64.StdEncoding.DecodeString(strings.TrimPrefix(auth, "Basic "))
+	if err != nil {
+		return
+	}
+
+	s := string(b)
+	idx := strings.IndexByte(s, ':')
+	if idx < 0 {
+		return
+	}
+
+	return s[:idx], s[idx+1:], true
+}
+
+func init() {
+	proxy.AddUsage("http", `
+Http scheme:
+  http://[user:pass@]host:port
+`)
+}

proxy/http/request.go

@@ -0,0 +1,120 @@
+package http
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"net/textproto"
+	"net/url"
+	"strings"
+
+	"github.com/nadoo/glider/pkg/log"
+)
+
+// Methods are http methods from rfc.
+// https://www.rfc-editor.org/rfc/rfc2616, http methods must be uppercase
+var Methods = [...][]byte{
+	[]byte("GET"),
+	[]byte("POST"),
+	[]byte("PUT"),
+	[]byte("DELETE"),
+	[]byte("CONNECT"),
+	[]byte("HEAD"),
+	[]byte("OPTIONS"),
+	[]byte("TRACE"),
+	[]byte("PATCH"),
+}
+
+type request struct {
+	method string
+	uri    string
+	proto  string
+	auth   string
+	header textproto.MIMEHeader
+
+	target string // target host with port
+	ruri   string // relative uri
+	absuri string // absolute uri
+}
+
+func parseRequest(r *bufio.Reader) (*request, error) {
+	tpr := textproto.NewReader(r)
+	line, err := tpr.ReadLine()
+	if err != nil {
+		return nil, err
+	}
+
+	method, uri, proto, ok := parseStartLine(line)
+	if !ok {
+		return nil, fmt.Errorf("error in parseStartLine: %s", line)
+	}
+
+	header, err := tpr.ReadMIMEHeader()
+	if err != nil {
+		log.F("[http] read header error:%s", err)
+		return nil, err
+	}
+
+	auth := header.Get("Proxy-Authorization")
+
+	cleanHeaders(header)
+	header.Set("Connection", "close")
+
+	// https://github.com/golang/go/blob/dcf0929de6a12103a8fd7097abd6e797188c366d/src/net/http/request.go#L1047
+	justAuthority := method == "CONNECT" && !strings.HasPrefix(uri, "/")
+	if justAuthority {
+		uri = "http://" + uri
+	}
+
+	u, err := url.ParseRequestURI(uri)
+	if err != nil {
+		log.F("[http] parse request url error: %s, uri: %s", err, uri)
+		return nil, err
+	}
+
+	if justAuthority {
+		// Strip the bogus "http://" back off.
+		u.Scheme = ""
+		uri = uri[7:]
+	}
+
+	tgt := u.Host
+	if !strings.Contains(tgt, ":") {
+		tgt += ":80"
+	}
+
+	req := &request{
+		method: method,
+		uri:    uri,
+		proto:  proto,
+		auth:   auth,
+		header: header,
+		target: tgt,
+	}
+
+	if u.IsAbs() {
+		req.absuri = u.String()
+		u.Scheme, u.Host = "", ""
+		req.ruri = u.String()
+	} else {
+		req.ruri = u.String()
+		base, err := url.Parse("http://" + header.Get("Host"))
+		if err != nil {
+			return nil, err
+		}
+		u = base.ResolveReference(u)
+		req.absuri = u.String()
+	}
+
+	return req, nil
+}
+
+func (r *request) WriteBuf(buf *bytes.Buffer) {
+	writeStartLine(buf, r.method, r.ruri, r.proto)
+	writeHeaders(buf, r.header)
+}
+
+func (r *request) WriteAbsBuf(buf *bytes.Buffer) {
+	writeStartLine(buf, r.method, r.absuri, r.proto)
+	writeHeaders(buf, r.header)
+}

proxy/http/server.go

@@ -0,0 +1,166 @@
+package http
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"net/textproto"
+	"strings"
+	"time"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/proxy"
+)
+
+// NewHTTPServer returns a http proxy server.
+func NewHTTPServer(s string, p proxy.Proxy) (proxy.Server, error) {
+	return NewHTTP(s, nil, p)
+}
+
+// ListenAndServe listens on server's addr and serves connections.
+func (s *HTTP) ListenAndServe() {
+	l, err := net.Listen("tcp", s.addr)
+	if err != nil {
+		log.Fatalf("[http] failed to listen on %s: %v", s.addr, err)
+		return
+	}
+	defer l.Close()
+
+	log.F("[http] listening TCP on %s", s.addr)
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			log.F("[http] failed to accept: %v", err)
+			continue
+		}
+
+		go s.Serve(c)
+	}
+}
+
+// Serve serves a connection.
+func (s *HTTP) Serve(cc net.Conn) {
+	if c, ok := cc.(*net.TCPConn); ok {
+		c.SetKeepAlive(true)
+	}
+
+	c := proxy.NewConn(cc)
+	defer c.Close()
+
+	req, err := parseRequest(c.Reader())
+	if err != nil {
+		log.F("[http] can not parse request from %s, error: %v", c.RemoteAddr(), err)
+		return
+	}
+
+	if s.pretend {
+		fmt.Fprintf(c, "%s 404 Not Found\r\nServer: nginx\r\n\r\n404 Not Found\r\n", req.proto)
+		log.F("[http] %s <-> %s, pretend as web server", c.RemoteAddr().String(), s.Addr())
+		return
+	}
+
+	s.servRequest(req, c)
+}
+
+func (s *HTTP) servRequest(req *request, c *proxy.Conn) {
+	// Auth
+	if s.user != "" && s.password != "" {
+		if user, pass, ok := extractUserPass(req.auth); !ok || user != s.user || pass != s.password {
+			io.WriteString(c, "HTTP/1.1 407 Proxy Authentication Required\r\nProxy-Authenticate: Basic\r\n\r\n")
+			log.F("[http] auth failed from %s, auth info: %s:%s", c.RemoteAddr(), user, pass)
+			return
+		}
+	}
+
+	if req.method == "CONNECT" {
+		s.servHTTPS(req, c)
+		return
+	}
+
+	s.servHTTP(req, c)
+}
+
+func (s *HTTP) servHTTPS(r *request, c net.Conn) {
+	rc, dialer, err := s.proxy.Dial("tcp", r.uri)
+	if err != nil {
+		io.WriteString(c, r.proto+" 502 ERROR\r\n\r\n")
+		log.F("[http] %s <-> %s [c] via %s, error in dial: %v", c.RemoteAddr(), r.uri, dialer.Addr(), err)
+		return
+	}
+	defer rc.Close()
+
+	io.WriteString(c, "HTTP/1.1 200 Connection established\r\n\r\n")
+
+	log.F("[http] %s <-> %s [c] via %s", c.RemoteAddr(), r.uri, dialer.Addr())
+
+	if err = proxy.Relay(c, rc); err != nil {
+		log.F("[http] %s <-> %s via %s, relay error: %v", c.RemoteAddr(), r.uri, dialer.Addr(), err)
+		// record remote conn failure only
+		if !strings.Contains(err.Error(), s.addr) {
+			s.proxy.Record(dialer, false)
+		}
+	}
+}
+
+func (s *HTTP) servHTTP(req *request, c *proxy.Conn) {
+	rc, dialer, err := s.proxy.Dial("tcp", req.target)
+	if err != nil {
+		fmt.Fprintf(c, "%s 502 ERROR\r\n\r\n", req.proto)
+		log.F("[http] %s <-> %s via %s, error in dial: %v", c.RemoteAddr(), req.target, dialer.Addr(), err)
+		return
+	}
+	defer rc.Close()
+
+	buf := pool.GetBytesBuffer()
+	defer pool.PutBytesBuffer(buf)
+
+	// send request to remote server
+	req.WriteBuf(buf)
+	_, err = rc.Write(buf.Bytes())
+	if err != nil {
+		return
+	}
+
+	// copy the left request bytes to remote server. eg. length specificed or chunked body.
+	go func() {
+		if _, err := c.Reader().Peek(1); err == nil {
+			proxy.Copy(rc, c)
+			rc.SetDeadline(time.Now())
+			c.SetDeadline(time.Now())
+		}
+	}()
+
+	r := pool.GetBufReader(rc)
+	defer pool.PutBufReader(r)
+
+	tpr := textproto.NewReader(r)
+	line, err := tpr.ReadLine()
+	if err != nil {
+		return
+	}
+
+	proto, code, status, ok := parseStartLine(line)
+	if !ok {
+		return
+	}
+
+	header, err := tpr.ReadMIMEHeader()
+	if err != nil {
+		log.F("[http] read header error:%s", err)
+		return
+	}
+
+	header.Set("Proxy-Connection", "close")
+	header.Set("Connection", "close")
+
+	buf.Reset()
+	writeStartLine(buf, proto, code, status)
+	writeHeaders(buf, header)
+
+	log.F("[http] %s <-> %s via %s", c.RemoteAddr(), req.target, dialer.Addr())
+	c.Write(buf.Bytes())
+
+	proxy.Copy(c, r)
+}

proxy/kcp/kcp.go

@@ -0,0 +1,281 @@
+package kcp
+
+import (
+	"crypto/sha1"
+	"errors"
+	"fmt"
+	"net"
+	"net/url"
+	"strconv"
+	"strings"
+
+	kcp "github.com/xtaci/kcp-go/v5"
+	"golang.org/x/crypto/pbkdf2"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/proxy"
+)
+
+// KCP struct.
+type KCP struct {
+	dialer proxy.Dialer
+	proxy  proxy.Proxy
+	addr   string
+
+	key   string
+	crypt string
+	block kcp.BlockCrypt
+	mode  string
+
+	dataShards   int
+	parityShards int
+
+	server proxy.Server
+}
+
+func init() {
+	proxy.RegisterDialer("kcp", NewKCPDialer)
+	proxy.RegisterServer("kcp", NewKCPServer)
+}
+
+// NewKCP returns a kcp proxy struct.
+func NewKCP(s string, d proxy.Dialer, p proxy.Proxy) (*KCP, error) {
+	u, err := url.Parse(s)
+	if err != nil {
+		log.F("[kcp] parse url err: %s", err)
+		return nil, err
+	}
+
+	addr := u.Host
+	crypt := u.User.Username()
+	key, _ := u.User.Password()
+
+	query := u.Query()
+
+	// dataShards
+	dShards := query.Get("dataShards")
+	if dShards == "" {
+		dShards = "10"
+	}
+
+	dataShards, err := strconv.ParseUint(dShards, 10, 32)
+	if err != nil {
+		log.F("[kcp] parse dataShards err: %s", err)
+		return nil, err
+	}
+
+	// parityShards
+	pShards := query.Get("parityShards")
+	if pShards == "" {
+		pShards = "3"
+	}
+
+	parityShards, err := strconv.ParseUint(pShards, 10, 32)
+	if err != nil {
+		log.F("[kcp] parse parityShards err: %s", err)
+		return nil, err
+	}
+
+	k := &KCP{
+		dialer:       d,
+		proxy:        p,
+		addr:         addr,
+		key:          key,
+		crypt:        crypt,
+		mode:         query.Get("mode"),
+		dataShards:   int(dataShards),
+		parityShards: int(parityShards),
+	}
+
+	if k.crypt != "" {
+		k.block, err = block(k.crypt, k.key)
+		if err != nil {
+			return nil, fmt.Errorf("[kcp] error: %s", err)
+		}
+	}
+
+	if k.mode == "" {
+		k.mode = "fast"
+	}
+
+	return k, nil
+}
+
+func block(crypt, key string) (block kcp.BlockCrypt, err error) {
+	pass := pbkdf2.Key([]byte(key), []byte("kcp-go"), 4096, 32, sha1.New)
+	switch crypt {
+	case "sm4":
+		block, _ = kcp.NewSM4BlockCrypt(pass[:16])
+	case "tea":
+		block, _ = kcp.NewTEABlockCrypt(pass[:16])
+	case "xor":
+		block, _ = kcp.NewSimpleXORBlockCrypt(pass)
+	case "none":
+		block, _ = kcp.NewNoneBlockCrypt(pass)
+	case "aes":
+		block, _ = kcp.NewAESBlockCrypt(pass)
+	case "aes-128":
+		block, _ = kcp.NewAESBlockCrypt(pass[:16])
+	case "aes-192":
+		block, _ = kcp.NewAESBlockCrypt(pass[:24])
+	case "blowfish":
+		block, _ = kcp.NewBlowfishBlockCrypt(pass)
+	case "twofish":
+		block, _ = kcp.NewTwofishBlockCrypt(pass)
+	case "cast5":
+		block, _ = kcp.NewCast5BlockCrypt(pass[:16])
+	case "3des":
+		block, _ = kcp.NewTripleDESBlockCrypt(pass[:24])
+	case "xtea":
+		block, _ = kcp.NewXTEABlockCrypt(pass[:16])
+	case "salsa20":
+		block, _ = kcp.NewSalsa20BlockCrypt(pass)
+	default:
+		err = errors.New("unknown crypt type '" + crypt + "'")
+	}
+	return block, err
+}
+
+// NewKCPDialer returns a kcp proxy dialer.
+func NewKCPDialer(s string, d proxy.Dialer) (proxy.Dialer, error) {
+	return NewKCP(s, d, nil)
+}
+
+// NewKCPServer returns a kcp proxy server.
+func NewKCPServer(s string, p proxy.Proxy) (proxy.Server, error) {
+	schemes := strings.SplitN(s, ",", 2)
+	k, err := NewKCP(schemes[0], nil, p)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(schemes) > 1 {
+		k.server, err = proxy.ServerFromURL(schemes[1], p)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return k, nil
+}
+
+// ListenAndServe listens on server's addr and serves connections.
+func (s *KCP) ListenAndServe() {
+	l, err := kcp.ListenWithOptions(s.addr, s.block, s.dataShards, s.parityShards)
+	if err != nil {
+		log.Fatalf("[kcp] failed to listen on %s: %v", s.addr, err)
+		return
+	}
+	defer l.Close()
+
+	log.F("[kcp] listening on %s", s.addr)
+
+	for {
+		c, err := l.AcceptKCP()
+		if err != nil {
+			log.F("[kcp] failed to accept: %v", err)
+			continue
+		}
+
+		s.setParams(c)
+
+		go s.Serve(c)
+	}
+}
+
+// Serve serves connections.
+func (s *KCP) Serve(c net.Conn) {
+	if s.server != nil {
+		s.server.Serve(c)
+		return
+	}
+
+	defer c.Close()
+
+	rc, dialer, err := s.proxy.Dial("tcp", "")
+	if err != nil {
+		log.F("[kcp] %s <-> %s via %s, error in dial: %v", c.RemoteAddr(), s.addr, dialer.Addr(), err)
+		s.proxy.Record(dialer, false)
+		return
+	}
+
+	defer rc.Close()
+
+	log.F("[kcp] %s <-> %s", c.RemoteAddr(), dialer.Addr())
+
+	if err = proxy.Relay(c, rc); err != nil {
+		log.F("[kcp] %s <-> %s, relay error: %v", c.RemoteAddr(), dialer.Addr(), err)
+		// record remote conn failure only
+		if !strings.Contains(err.Error(), s.addr) {
+			s.proxy.Record(dialer, false)
+		}
+	}
+}
+
+// Addr returns forwarder's address.
+func (s *KCP) Addr() string {
+	if s.addr == "" {
+		return s.dialer.Addr()
+	}
+	return s.addr
+}
+
+// Dial connects to the address addr on the network net via the proxy.
+func (s *KCP) Dial(network, addr string) (net.Conn, error) {
+	// NOTE: kcp uses udp, we should dial remote server directly here
+	c, err := kcp.DialWithOptions(s.addr, s.block, s.dataShards, s.parityShards)
+	if err != nil {
+		log.F("[kcp] dial to %s error: %s", s.addr, err)
+		return nil, err
+	}
+
+	s.setParams(c)
+
+	c.SetDSCP(0)
+	c.SetReadBuffer(4194304)
+	c.SetWriteBuffer(4194304)
+
+	return c, err
+}
+
+// DialUDP connects to the given address via the proxy.
+func (s *KCP) DialUDP(network, addr string) (net.PacketConn, error) {
+	return nil, proxy.ErrNotSupported
+}
+
+func (s *KCP) setParams(c *kcp.UDPSession) {
+	// TODO: change them to customizable later?
+	c.SetStreamMode(true)
+	c.SetWriteDelay(false)
+
+	switch s.mode {
+	case "normal":
+		c.SetNoDelay(0, 40, 2, 1)
+	case "fast":
+		c.SetNoDelay(0, 30, 2, 1)
+	case "fast2":
+		c.SetNoDelay(1, 20, 2, 1)
+	case "fast3":
+		c.SetNoDelay(1, 10, 2, 1)
+	default:
+		log.F("[kcp] unkonw mode: %s, use fast mode instead", s.mode)
+		c.SetNoDelay(0, 30, 2, 1)
+	}
+
+	c.SetWindowSize(1024, 1024)
+	c.SetMtu(1350)
+	c.SetACKNoDelay(true)
+}
+
+func init() {
+	proxy.AddUsage("kcp", `
+KCP scheme:
+  kcp://CRYPT:KEY@host:port[?dataShards=NUM&parityShards=NUM&mode=MODE]
+  
+Available crypt types for KCP:
+  none, sm4, tea, xor, aes, aes-128, aes-192, blowfish, twofish, cast5, 3des, xtea, salsa20
+  
+Available modes for KCP:
+  fast, fast2, fast3, normal, default: fast
+`)
+}

proxy/mixed/mixed.go

@@ -0,0 +1,90 @@
+package mixed
+
+import (
+	"net"
+	"net/url"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/proxy"
+	"github.com/nadoo/glider/proxy/http"
+	"github.com/nadoo/glider/proxy/socks5"
+)
+
+// Mixed struct.
+type Mixed struct {
+	proxy proxy.Proxy
+	addr  string
+
+	httpServer   *http.HTTP
+	socks5Server *socks5.Socks5
+}
+
+func init() {
+	proxy.RegisterServer("mixed", NewMixedServer)
+}
+
+// NewMixed returns a mixed proxy.
+func NewMixed(s string, p proxy.Proxy) (*Mixed, error) {
+	u, err := url.Parse(s)
+	if err != nil {
+		log.F("parse err: %s", err)
+		return nil, err
+	}
+
+	m := &Mixed{
+		proxy: p,
+		addr:  u.Host,
+	}
+
+	m.httpServer, err = http.NewHTTP(s, nil, p)
+	if err != nil {
+		return nil, err
+	}
+
+	m.socks5Server, err = socks5.NewSocks5(s, nil, p)
+	if err != nil {
+		return nil, err
+	}
+
+	return m, nil
+}
+
+// NewMixedServer returns a mixed server.
+func NewMixedServer(s string, p proxy.Proxy) (proxy.Server, error) {
+	return NewMixed(s, p)
+}
+
+// ListenAndServe listens on server's addr and serves connections.
+func (m *Mixed) ListenAndServe() {
+	go m.socks5Server.ListenAndServeUDP()
+
+	l, err := net.Listen("tcp", m.addr)
+	if err != nil {
+		log.Fatalf("[mixed] failed to listen on %s: %v", m.addr, err)
+		return
+	}
+
+	log.F("[mixed] http & socks5 server listening TCP on %s", m.addr)
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			log.F("[mixed] failed to accept: %v", err)
+			continue
+		}
+
+		go m.Serve(c)
+	}
+}
+
+// Serve serves connections.
+func (m *Mixed) Serve(c net.Conn) {
+	conn := proxy.NewConn(c)
+	if head, err := conn.Peek(1); err == nil {
+		if head[0] == socks5.Version {
+			m.socks5Server.Serve(conn)
+			return
+		}
+	}
+	m.httpServer.Serve(conn)
+}

proxy/obfs/http.go

@@ -0,0 +1,82 @@
+package obfs
+
+import (
+	"bufio"
+	"crypto/rand"
+	"encoding/base64"
+	"io"
+	"net"
+
+	"github.com/nadoo/glider/pkg/pool"
+)
+
+// HTTPObfs struct
+type HTTPObfs struct {
+	obfsHost string
+	obfsURI  string
+	obfsUA   string
+}
+
+// NewHTTPObfs returns a HTTPObfs object
+func NewHTTPObfs(obfsHost, obfsURI, obfsUA string) *HTTPObfs {
+	return &HTTPObfs{obfsHost, obfsURI, obfsUA}
+}
+
+// HTTPObfsConn struct
+type HTTPObfsConn struct {
+	*HTTPObfs
+
+	net.Conn
+	reader io.Reader
+}
+
+// NewConn returns a new obfs connection
+func (p *HTTPObfs) NewConn(c net.Conn) (net.Conn, error) {
+	cc := &HTTPObfsConn{
+		Conn:     c,
+		HTTPObfs: p,
+	}
+
+	// send http header to remote server
+	_, err := cc.writeHeader()
+	return cc, err
+}
+
+func (c *HTTPObfsConn) writeHeader() (int, error) {
+	buf := pool.GetBytesBuffer()
+	defer pool.PutBytesBuffer(buf)
+
+	buf.WriteString("GET " + c.obfsURI + " HTTP/1.1\r\n")
+	buf.WriteString("Host: " + c.obfsHost + "\r\n")
+	buf.WriteString("User-Agent: " + c.obfsUA + "\r\n")
+	buf.WriteString("Upgrade: websocket\r\n")
+	buf.WriteString("Connection: Upgrade\r\n")
+
+	b := pool.GetBuffer(16)
+	rand.Read(b)
+	buf.WriteString("Sec-WebSocket-Key: " + base64.StdEncoding.EncodeToString(b) + "\r\n")
+	pool.PutBuffer(b)
+
+	buf.WriteString("\r\n")
+
+	return c.Conn.Write(buf.Bytes())
+}
+
+func (c *HTTPObfsConn) Read(b []byte) (n int, err error) {
+	if c.reader == nil {
+		r := bufio.NewReader(c.Conn)
+		c.reader = r
+		for {
+			l, _, err := r.ReadLine()
+			if err != nil {
+				return 0, err
+			}
+
+			if len(l) == 0 {
+				break
+			}
+		}
+	}
+
+	return c.reader.Read(b)
+}

proxy/obfs/obfs.go

@@ -0,0 +1,121 @@
+// Package obfs implements simple-obfs of ss
+package obfs
+
+import (
+	"errors"
+	"net"
+	"net/url"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/proxy"
+)
+
+// Obfs struct.
+type Obfs struct {
+	dialer proxy.Dialer
+	addr   string
+
+	obfsType string
+	obfsHost string
+	obfsURI  string
+	obfsUA   string
+
+	obfsConn func(c net.Conn) (net.Conn, error)
+}
+
+func init() {
+	proxy.RegisterDialer("simple-obfs", NewObfsDialer)
+}
+
+// NewObfs returns a proxy struct.
+func NewObfs(s string, d proxy.Dialer) (*Obfs, error) {
+	u, err := url.Parse(s)
+	if err != nil {
+		log.F("parse url err: %s", err)
+		return nil, err
+	}
+
+	addr := u.Host
+
+	query := u.Query()
+	obfsType := query.Get("type")
+	if obfsType == "" {
+		obfsType = "http"
+	}
+
+	obfsHost := query.Get("host")
+	if obfsHost == "" {
+		return nil, errors.New("[obfs] host cannot be null")
+	}
+
+	obfsURI := query.Get("uri")
+	if obfsURI == "" {
+		obfsURI = "/"
+	}
+
+	obfsUA := query.Get("ua")
+	if obfsUA == "" {
+		obfsUA = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.80 Safari/537.36"
+	}
+
+	p := &Obfs{
+		dialer:   d,
+		addr:     addr,
+		obfsType: obfsType,
+		obfsHost: obfsHost,
+		obfsURI:  obfsURI,
+		obfsUA:   obfsUA,
+	}
+
+	switch obfsType {
+	case "http":
+		httpObfs := NewHTTPObfs(obfsHost, obfsURI, obfsUA)
+		p.obfsConn = httpObfs.NewConn
+	case "tls":
+		tlsObfs := NewTLSObfs(obfsHost)
+		p.obfsConn = tlsObfs.NewConn
+	default:
+		return nil, errors.New("[obfs] unknown obfs type: " + obfsType)
+	}
+
+	return p, nil
+}
+
+// NewObfsDialer returns a proxy dialer.
+func NewObfsDialer(s string, dialer proxy.Dialer) (proxy.Dialer, error) {
+	return NewObfs(s, dialer)
+}
+
+// Addr returns forwarder's address.
+func (s *Obfs) Addr() string {
+	if s.addr == "" {
+		return s.dialer.Addr()
+	}
+	return s.addr
+}
+
+// Dial connects to the address addr on the network net via the proxy.
+func (s *Obfs) Dial(network, addr string) (net.Conn, error) {
+	c, err := s.dialer.Dial("tcp", s.addr)
+	if err != nil {
+		log.F("[obfs] dial to %s error: %s", s.addr, err)
+		return nil, err
+	}
+
+	return s.obfsConn(c)
+}
+
+// DialUDP connects to the given address via the proxy.
+func (s *Obfs) DialUDP(network, addr string) (net.PacketConn, error) {
+	return nil, proxy.ErrNotSupported
+}
+
+func init() {
+	proxy.AddUsage("simple-obfs", `
+Simple-Obfs scheme:
+  simple-obfs://host:port[?type=TYPE&host=HOST&uri=URI&ua=UA]
+  
+Available types for simple-obfs:
+  http, tls
+`)
+}

proxy/obfs/tls.go

@@ -0,0 +1,265 @@
+// https://www.rfc-editor.org/rfc/rfc5246
+// https://golang.org/src/crypto/tls/handshake_messages.go
+
+// NOTE:
+// The official obfs-server only checks 6 static bytes of client hello packet,
+// so if we send a malformed packet, e.g: set a wrong length number of extensions,
+// obfs-server will treat it as a correct packet, but in wireshak, it's malformed.
+
+package obfs
+
+import (
+	"bufio"
+	"bytes"
+	"crypto/rand"
+	"encoding/binary"
+	"io"
+	"net"
+	"time"
+
+	"github.com/nadoo/glider/pkg/pool"
+)
+
+const (
+	lenSize   = 2
+	chunkSize = 1 << 13 // 8192
+)
+
+// TLSObfs struct
+type TLSObfs struct {
+	obfsHost string
+}
+
+// NewTLSObfs returns a TLSObfs object
+func NewTLSObfs(obfsHost string) *TLSObfs {
+	return &TLSObfs{obfsHost: obfsHost}
+}
+
+// TLSObfsConn struct
+type TLSObfsConn struct {
+	*TLSObfs
+
+	net.Conn
+	reqSent   bool
+	reader    *bufio.Reader
+	buf       [lenSize]byte
+	leftBytes int
+}
+
+// NewConn returns a new obfs connection
+func (p *TLSObfs) NewConn(c net.Conn) (net.Conn, error) {
+	cc := &TLSObfsConn{Conn: c, TLSObfs: p}
+	return cc, nil
+}
+
+func (c *TLSObfsConn) Write(b []byte) (int, error) {
+	if !c.reqSent {
+		c.reqSent = true
+		return c.handshake(b)
+	}
+
+	buf := pool.GetBytesBuffer()
+	defer pool.PutBytesBuffer(buf)
+
+	n := len(b)
+	for i := 0; i < n; i += chunkSize {
+		buf.Reset()
+		end := min(i+chunkSize, n)
+
+		buf.Write([]byte{0x17, 0x03, 0x03})
+		binary.Write(buf, binary.BigEndian, uint16(len(b[i:end])))
+		buf.Write(b[i:end])
+
+		_, err := c.Conn.Write(buf.Bytes())
+		if err != nil {
+			return 0, err
+		}
+	}
+
+	return n, nil
+}
+
+func (c *TLSObfsConn) Read(b []byte) (int, error) {
+	if c.reader == nil {
+		c.reader = bufio.NewReader(c.Conn)
+		// Server Hello
+		// TLSv1.2 Record Layer: Handshake Protocol: Server Hello (96 bytes)
+		// TLSv1.2 Record Layer: Change Cipher Spec Protocol: Change Cipher Spec (6 bytes)
+		c.reader.Discard(102)
+	}
+
+	if c.leftBytes == 0 {
+		// TLSv1.2 Record Layer:
+		// 1st packet: handshake encrypted message / following packets: application data
+		// 1 byte: Content Type: Handshake (22) / Application Data (23)
+		// 2 bytes: Version: TLS 1.2 (0x0303)
+		c.reader.Discard(3)
+
+		// get length
+		_, err := io.ReadFull(c.reader, c.buf[:lenSize])
+		if err != nil {
+			return 0, err
+		}
+
+		c.leftBytes = int(binary.BigEndian.Uint16(c.buf[:lenSize]))
+	}
+
+	readLen := len(b)
+	if readLen > c.leftBytes {
+		readLen = c.leftBytes
+	}
+
+	m, err := c.reader.Read(b[:readLen])
+	if err != nil {
+		return 0, err
+	}
+
+	c.leftBytes -= m
+
+	return m, nil
+}
+
+func (c *TLSObfsConn) handshake(b []byte) (int, error) {
+	buf := pool.GetBytesBuffer()
+	defer pool.PutBytesBuffer(buf)
+
+	bufExt := pool.GetBytesBuffer()
+	defer pool.PutBytesBuffer(bufExt)
+
+	bufHello := pool.GetBytesBuffer()
+	defer pool.PutBytesBuffer(bufHello)
+
+	// prepare extension & clientHello content
+	extension(b, c.obfsHost, bufExt)
+	clientHello(bufHello)
+
+	// prepare lengths
+	extLen := bufExt.Len()
+	helloLen := bufHello.Len() + 2 + extLen // 2: len(extContentLength)
+	handshakeLen := 4 + helloLen            // 1: len(0x01) + 3: len(clientHelloContentLength)
+
+	// TLS Record Layer Begin
+	// Content Type: Handshake (22)
+	buf.WriteByte(0x16)
+
+	// Version: TLS 1.0 (0x0301)
+	buf.Write([]byte{0x03, 0x01})
+
+	// length
+	binary.Write(buf, binary.BigEndian, uint16(handshakeLen))
+
+	// Handshake Begin
+	// Handshake Type: Client Hello (1)
+	buf.WriteByte(0x01)
+
+	// length: uint24(3 bytes), but golang doesn't have this type
+	buf.Write([]byte{uint8(helloLen >> 16), uint8(helloLen >> 8), uint8(helloLen)})
+
+	// clientHello content
+	buf.Write(bufHello.Bytes())
+
+	// Extension Begin
+	// ext content length
+	binary.Write(buf, binary.BigEndian, uint16(extLen))
+
+	// ext content
+	buf.Write(bufExt.Bytes())
+
+	_, err := c.Conn.Write(buf.Bytes())
+
+	if err != nil {
+		return 0, err
+	}
+
+	return len(b), nil
+}
+
+func clientHello(buf *bytes.Buffer) {
+	// Version: TLS 1.2 (0x0303)
+	buf.Write([]byte{0x03, 0x03})
+
+	// Random
+	// https://tools.ietf.org/id/draft-mathewson-no-gmtunixtime-00.txt
+	// NOTE:
+	// Most tls implementations do not deal with the first 4 bytes unix time,
+	// clients do not send current time, and server do not check it,
+	// golang tls client and chrome browser send random bytes instead.
+	//
+	binary.Write(buf, binary.BigEndian, uint32(time.Now().Unix()))
+	random := make([]byte, 28)
+	// The above 2 lines of codes was added to make it compatible with some server implementation,
+	// if we don't need the compatibility, just use the following code instead.
+	// random := make([]byte, 32)
+
+	rand.Read(random)
+	buf.Write(random)
+
+	// Session ID Length: 32
+	buf.WriteByte(32)
+	// Session ID
+	sessionID := make([]byte, 32)
+	rand.Read(sessionID)
+	buf.Write(sessionID)
+
+	// https://github.com/shadowsocks/simple-obfs/blob/7659eeccf473aa41eb294e92c32f8f60a8747325/src/obfs_tls.c#L57
+	// Cipher Suites Length: 56
+	binary.Write(buf, binary.BigEndian, uint16(56))
+	// Cipher Suites (28 suites)
+	buf.Write([]byte{
+		0xc0, 0x2c, 0xc0, 0x30, 0x00, 0x9f, 0xcc, 0xa9, 0xcc, 0xa8, 0xcc, 0xaa, 0xc0, 0x2b, 0xc0, 0x2f,
+		0x00, 0x9e, 0xc0, 0x24, 0xc0, 0x28, 0x00, 0x6b, 0xc0, 0x23, 0xc0, 0x27, 0x00, 0x67, 0xc0, 0x0a,
+		0xc0, 0x14, 0x00, 0x39, 0xc0, 0x09, 0xc0, 0x13, 0x00, 0x33, 0x00, 0x9d, 0x00, 0x9c, 0x00, 0x3d,
+		0x00, 0x3c, 0x00, 0x35, 0x00, 0x2f, 0x00, 0xff,
+	})
+
+	// Compression Methods Length: 1
+	buf.WriteByte(0x01)
+	// Compression Methods (1 method)
+	buf.WriteByte(0x00)
+}
+
+func extension(b []byte, server string, buf *bytes.Buffer) {
+	// Extension: SessionTicket TLS
+	buf.Write([]byte{0x00, 0x23}) // type
+	// NOTE: send some data in sessionticket, the server will treat it as data too
+	binary.Write(buf, binary.BigEndian, uint16(len(b))) // length
+	buf.Write(b)
+
+	// Extension: server_name
+	buf.Write([]byte{0x00, 0x00})                              // type
+	binary.Write(buf, binary.BigEndian, uint16(len(server)+5)) // length
+	binary.Write(buf, binary.BigEndian, uint16(len(server)+3)) // Server Name list length
+	buf.WriteByte(0x00)                                        // Server Name Type: host_name (0)
+	binary.Write(buf, binary.BigEndian, uint16(len(server)))   // Server Name length
+	buf.WriteString(server)
+
+	// https://github.com/shadowsocks/simple-obfs/blob/7659eeccf473aa41eb294e92c32f8f60a8747325/src/obfs_tls.c#L88
+	// Extension: ec_point_formats (len=4)
+	buf.Write([]byte{0x00, 0x0b})                  // type
+	binary.Write(buf, binary.BigEndian, uint16(4)) // length
+	buf.WriteByte(0x03)                            // format length
+	buf.Write([]byte{0x01, 0x00, 0x02})
+
+	// Extension: supported_groups (len=10)
+	buf.Write([]byte{0x00, 0x0a})                   // type
+	binary.Write(buf, binary.BigEndian, uint16(10)) // length
+	binary.Write(buf, binary.BigEndian, uint16(8))  // Supported Groups List Length: 8
+	buf.Write([]byte{0x00, 0x1d, 0x00, 0x17, 0x00, 0x19, 0x00, 0x18})
+
+	// Extension: signature_algorithms (len=32)
+	buf.Write([]byte{0x00, 0x0d})                   // type
+	binary.Write(buf, binary.BigEndian, uint16(32)) // length
+	binary.Write(buf, binary.BigEndian, uint16(30)) // Signature Hash Algorithms Length: 30
+	buf.Write([]byte{
+		0x06, 0x01, 0x06, 0x02, 0x06, 0x03, 0x05, 0x01, 0x05, 0x02, 0x05, 0x03, 0x04, 0x01, 0x04, 0x02,
+		0x04, 0x03, 0x03, 0x01, 0x03, 0x02, 0x03, 0x03, 0x02, 0x01, 0x02, 0x02, 0x02, 0x03,
+	})
+
+	// Extension: encrypt_then_mac (len=0)
+	buf.Write([]byte{0x00, 0x16})                  // type
+	binary.Write(buf, binary.BigEndian, uint16(0)) // length
+
+	// Extension: extended_master_secret (len=0)
+	buf.Write([]byte{0x00, 0x17})                  // type
+	binary.Write(buf, binary.BigEndian, uint16(0)) // length
+}

proxy/proxy.go

@@ -0,0 +1,46 @@
+package proxy
+
+import (
+	"net"
+	"strings"
+)
+
+// Proxy is a dialer manager.
+type Proxy interface {
+	// Dial connects to the given address via the proxy.
+	Dial(network, addr string) (c net.Conn, dialer Dialer, err error)
+
+	// DialUDP connects to the given address via the proxy.
+	DialUDP(network, addr string) (pc net.PacketConn, dialer UDPDialer, err error)
+
+	// Get the dialer by dstAddr.
+	NextDialer(dstAddr string) Dialer
+
+	// Record records result while using the dialer from proxy.
+	Record(dialer Dialer, success bool)
+}
+
+var (
+	msg    strings.Builder
+	usages = make(map[string]string)
+)
+
+// AddUsage adds help message for the named proxy.
+func AddUsage(name, usage string) {
+	usages[name] = usage
+	msg.WriteString(usage)
+	msg.WriteString("\n--")
+}
+
+// Usage returns help message of the named proxy.
+func Usage(name string) string {
+	if name == "all" {
+		return msg.String()
+	}
+
+	if usage, ok := usages[name]; ok {
+		return usage
+	}
+
+	return "can not find usage for: " + name
+}

proxy/pxyproto/server.go

@@ -0,0 +1,134 @@
+package pxyproto
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"net/url"
+	"strings"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/proxy"
+)
+
+func init() {
+	proxy.RegisterServer("pxyproto", NewPxyProtoServer)
+}
+
+// PxyProtoServer struct.
+type PxyProtoServer struct {
+	addr   string
+	proxy  proxy.Proxy
+	server proxy.Server
+}
+
+// NewPxyProtoServer returns a PxyProtoServer struct.
+func NewPxyProtoServer(s string, p proxy.Proxy) (proxy.Server, error) {
+	schemes := strings.SplitN(s, ",", 2)
+	u, err := url.Parse(schemes[0])
+	if err != nil {
+		log.F("[pxyproto] parse url err: %s", err)
+		return nil, err
+	}
+
+	t := &PxyProtoServer{proxy: p, addr: u.Host}
+	if len(schemes) < 2 {
+		return nil, errors.New("[pxyproto] you must use pxyproto with a proxy server, e.g: pxyproto://:1234,http://")
+	}
+
+	t.server, err = proxy.ServerFromURL(schemes[1], p)
+	if err != nil {
+		return nil, err
+	}
+
+	return t, nil
+}
+
+// ListenAndServe listens on server's addr and serves connections.
+func (s *PxyProtoServer) ListenAndServe() {
+	l, err := net.Listen("tcp", s.addr)
+	if err != nil {
+		log.Fatalf("[pxyproto] failed to listen on %s: %v", s.addr, err)
+		return
+	}
+	defer l.Close()
+
+	log.F("[pxyproto] listening TCP on %s", s.addr)
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			log.F("[pxyproto] failed to accept: %v", err)
+			continue
+		}
+
+		go s.Serve(c)
+	}
+}
+
+// Serve serves a connection.
+func (s *PxyProtoServer) Serve(cc net.Conn) {
+	c, err := newServerConn(cc)
+	if err != nil {
+		log.F("[pxyproto] parse header failed, error: %v", err)
+		cc.Close()
+		return
+	}
+
+	// log.F("[pxyproto] %s <-> %s <-> %s <-> %s",
+	// c.RemoteAddr(), c.LocalAddr(), cc.RemoteAddr(), cc.LocalAddr())
+
+	if s.server != nil {
+		s.server.Serve(c)
+		return
+	}
+}
+
+type serverConn struct {
+	*proxy.Conn
+	src, dst net.Addr
+}
+
+func newServerConn(c net.Conn) (*serverConn, error) {
+	sc := &serverConn{
+		Conn: proxy.NewConn(c),
+		src:  c.RemoteAddr(),
+		dst:  c.LocalAddr(),
+	}
+	return sc, sc.parseHeader()
+}
+
+// "PROXY TCPx SRC_IP DST_IP SRC_PORT DST_PORT"
+func (c *serverConn) parseHeader() error {
+	line, err := c.Conn.Reader().ReadString('\n')
+	if err != nil {
+		return err
+	}
+
+	line = strings.ReplaceAll(line, "\r\n", "")
+	// log.F("[pxyproto] req header: %s", line)
+
+	header := strings.Split(line, " ")
+	if len(header) != 6 {
+		return fmt.Errorf("invalid header: %s", line)
+	}
+
+	if header[0] != "PROXY" {
+		return fmt.Errorf("invalid header: %s", line)
+	}
+
+	c.src, err = net.ResolveTCPAddr("tcp", net.JoinHostPort(header[2], header[4]))
+	if err != nil {
+		return fmt.Errorf("parse header: %s, error: %v", line, err)
+	}
+
+	c.dst, err = net.ResolveTCPAddr("tcp", net.JoinHostPort(header[3], header[5]))
+	if err != nil {
+		return fmt.Errorf("parse header: %s, error: %v", line, err)
+	}
+
+	return nil
+}
+
+func (c *serverConn) LocalAddr() net.Addr  { return c.dst }
+func (c *serverConn) RemoteAddr() net.Addr { return c.src }

proxy/redir/redir_linux.go

@@ -0,0 +1,161 @@
+package redir
+
+import (
+	"net"
+	"net/netip"
+	"net/url"
+	"strings"
+	"syscall"
+	"unsafe"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/proxy"
+)
+
+// RedirProxy struct.
+type RedirProxy struct {
+	proxy proxy.Proxy
+	addr  string
+	ipv6  bool
+}
+
+func init() {
+	proxy.RegisterServer("redir", NewRedirServer)
+	proxy.RegisterServer("redir6", NewRedir6Server)
+}
+
+// NewRedirProxy returns a redirect proxy.
+func NewRedirProxy(s string, p proxy.Proxy, ipv6 bool) (*RedirProxy, error) {
+	u, err := url.Parse(s)
+	if err != nil {
+		log.F("parse err: %s", err)
+		return nil, err
+	}
+
+	addr := u.Host
+	r := &RedirProxy{
+		proxy: p,
+		addr:  addr,
+		ipv6:  ipv6,
+	}
+
+	return r, nil
+}
+
+// NewRedirServer returns a redir server.
+func NewRedirServer(s string, p proxy.Proxy) (proxy.Server, error) {
+	return NewRedirProxy(s, p, false)
+}
+
+// NewRedir6Server returns a redir server for ipv6.
+func NewRedir6Server(s string, p proxy.Proxy) (proxy.Server, error) {
+	return NewRedirProxy(s, p, true)
+}
+
+// ListenAndServe listens on server's addr and serves connections.
+func (s *RedirProxy) ListenAndServe() {
+	l, err := net.Listen("tcp", s.addr)
+	if err != nil {
+		log.Fatalf("[redir] failed to listen on %s: %v", s.addr, err)
+		return
+	}
+
+	log.F("[redir] listening TCP on %s", s.addr)
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			log.F("[redir] failed to accept: %v", err)
+			continue
+		}
+
+		go s.Serve(c)
+	}
+}
+
+// Serve serves connections.
+func (s *RedirProxy) Serve(cc net.Conn) {
+	defer cc.Close()
+
+	c, ok := cc.(*net.TCPConn)
+	if !ok {
+		log.F("[redir] not a tcp connection, can not chain redir proxy")
+		return
+	}
+
+	c.SetKeepAlive(true)
+	tgtAddr, err := getOrigDst(c, s.ipv6)
+	if err != nil {
+		log.F("[redir] failed to get target address: %v", err)
+		return
+	}
+	tgt := tgtAddr.String()
+
+	// loop request
+	if c.LocalAddr().String() == tgt {
+		log.F("[redir] %s <-> %s, unallowed request to redir port", c.RemoteAddr(), tgt)
+		return
+	}
+
+	rc, dialer, err := s.proxy.Dial("tcp", tgt)
+	if err != nil {
+		log.F("[redir] %s <-> %s via %s, error in dial: %v", c.RemoteAddr(), tgt, dialer.Addr(), err)
+		return
+	}
+	defer rc.Close()
+
+	log.F("[redir] %s <-> %s via %s", c.RemoteAddr(), tgt, dialer.Addr())
+
+	if err = proxy.Relay(c, rc); err != nil {
+		log.F("[redir] %s <-> %s via %s, relay error: %v", c.RemoteAddr(), tgt, dialer.Addr(), err)
+		// record remote conn failure only
+		if !strings.Contains(err.Error(), s.addr) {
+			s.proxy.Record(dialer, false)
+		}
+	}
+}
+
+// Get the original destination of a TCP connection.
+func getOrigDst(c *net.TCPConn, ipv6 bool) (netip.AddrPort, error) {
+	rc, err := c.SyscallConn()
+	if err != nil {
+		return netip.AddrPort{}, err
+	}
+	var addr netip.AddrPort
+	rc.Control(func(fd uintptr) {
+		if ipv6 {
+			addr, err = getorigdstIPv6(fd)
+		} else {
+			addr, err = getorigdst(fd)
+		}
+	})
+	return addr, err
+}
+
+// Call getorigdst() from linux/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+func getorigdst(fd uintptr) (netip.AddrPort, error) {
+	const _SO_ORIGINAL_DST = 80 // from linux/include/uapi/linux/netfilter_ipv4.h
+	var raw syscall.RawSockaddrInet4
+	siz := unsafe.Sizeof(raw)
+	if err := socketcall(GETSOCKOPT, fd, syscall.IPPROTO_IP, _SO_ORIGINAL_DST, uintptr(unsafe.Pointer(&raw)), uintptr(unsafe.Pointer(&siz)), 0); err != nil {
+		return netip.AddrPort{}, err
+	}
+	// NOTE: raw.Port is big-endian, just change it to little-endian
+	// TODO: improve here when we add big-endian $GOARCH support
+	port := raw.Port<<8 | raw.Port>>8
+	return netip.AddrPortFrom(netip.AddrFrom4(raw.Addr), port), nil
+}
+
+// Call ipv6_getorigdst() from linux/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
+func getorigdstIPv6(fd uintptr) (netip.AddrPort, error) {
+	const _IP6T_SO_ORIGINAL_DST = 80 // from linux/include/uapi/linux/netfilter_ipv6/ip6_tables.h
+	var raw syscall.RawSockaddrInet6
+	siz := unsafe.Sizeof(raw)
+	if err := socketcall(GETSOCKOPT, fd, syscall.IPPROTO_IPV6, _IP6T_SO_ORIGINAL_DST, uintptr(unsafe.Pointer(&raw)), uintptr(unsafe.Pointer(&siz)), 0); err != nil {
+		return netip.AddrPort{}, err
+	}
+	// NOTE: raw.Port is big-endian, just change it to little-endian
+	// TODO: improve here when we add big-endian $GOARCH support
+	port := raw.Port<<8 | raw.Port>>8
+	return netip.AddrPortFrom(netip.AddrFrom16(raw.Addr), port), nil
+}

proxy/redir/redir_linux_386.go

@@ -1,4 +1,4 @@
-package main
+package redir
 
 import (
 	"syscall"
@@ -6,7 +6,7 @@ import (
 )
 
 // https://github.com/golang/go/blob/9e6b79a5dfb2f6fe4301ced956419a0da83bd025/src/syscall/syscall_linux_386.go#L196
-const GETSOCKOPT = 15
+const GETSOCKOPT = 15 // https://golang.org/src/syscall/syscall_linux_386.go#L183
 
 func socketcall(call, a0, a1, a2, a3, a4, a5 uintptr) error {
 	var a [6]uintptr

proxy/redir/redir_linux_other.go

@@ -1,6 +1,6 @@
-// +build linux,!386
+//go:build linux && !386
 
-package main
+package redir
 
 import "syscall"
 

proxy/reject/reject.go

@@ -0,0 +1,46 @@
+// Package reject implements a virtual proxy which always reject requests.
+package reject
+
+import (
+	"errors"
+	"net"
+
+	"github.com/nadoo/glider/proxy"
+)
+
+// A Reject represents the base struct of a reject proxy.
+type Reject struct{}
+
+func init() {
+	proxy.RegisterDialer("reject", NewRejectDialer)
+}
+
+// NewReject returns a reject proxy, reject://.
+func NewReject(s string, d proxy.Dialer) (*Reject, error) {
+	return &Reject{}, nil
+}
+
+// NewRejectDialer returns a reject proxy dialer.
+func NewRejectDialer(s string, d proxy.Dialer) (proxy.Dialer, error) {
+	return NewReject(s, d)
+}
+
+// Addr returns forwarder's address.
+func (s *Reject) Addr() string { return "REJECT" }
+
+// Dial connects to the address addr on the network net via the proxy.
+func (s *Reject) Dial(network, addr string) (net.Conn, error) {
+	return nil, errors.New("REJECT")
+}
+
+// DialUDP connects to the given address via the proxy.
+func (s *Reject) DialUDP(network, addr string) (net.PacketConn, error) {
+	return nil, errors.New("REJECT")
+}
+
+func init() {
+	proxy.AddUsage("reject", `
+Reject scheme:
+  reject://
+`)
+}

proxy/server.go

@@ -0,0 +1,64 @@
+package proxy
+
+import (
+	"errors"
+	"net"
+	"sort"
+	"strings"
+)
+
+// Server interface.
+type Server interface {
+	// ListenAndServe sets up a listener and serve on it
+	ListenAndServe()
+
+	// Serve serves a connection
+	Serve(c net.Conn)
+}
+
+// PacketServer interface.
+type PacketServer interface {
+	ServePacket(pc net.PacketConn)
+}
+
+// ServerCreator is a function to create proxy servers.
+type ServerCreator func(s string, proxy Proxy) (Server, error)
+
+var (
+	serverCreators = make(map[string]ServerCreator)
+)
+
+// RegisterServer is used to register a proxy server.
+func RegisterServer(name string, c ServerCreator) {
+	serverCreators[strings.ToLower(name)] = c
+}
+
+// ServerFromURL calls the registered creator to create proxy servers.
+// proxy can not be nil.
+func ServerFromURL(s string, proxy Proxy) (Server, error) {
+	if proxy == nil {
+		return nil, errors.New("ServerFromURL: dialer cannot be nil")
+	}
+
+	if !strings.Contains(s, "://") {
+		s = "mixed://" + s
+	}
+
+	scheme := s[:strings.Index(s, ":")]
+	c, ok := serverCreators[strings.ToLower(scheme)]
+	if ok {
+		return c(s, proxy)
+	}
+
+	return nil, errors.New("unknown scheme '" + scheme + "'")
+}
+
+// ServerSchemes returns the registered server schemes.
+func ServerSchemes() string {
+	s := make([]string, 0, len(serverCreators))
+	for name := range serverCreators {
+		s = append(s, name)
+	}
+	sort.Strings(s)
+	return strings.Join(s, " ")
+}

proxy/smux/client.go

@@ -0,0 +1,79 @@
+package smux
+
+import (
+	"net"
+	"net/url"
+	"sync"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/smux"
+	"github.com/nadoo/glider/proxy"
+)
+
+// SmuxClient struct.
+type SmuxClient struct {
+	dialer  proxy.Dialer
+	addr    string
+	mu      sync.Mutex
+	session *smux.Session
+}
+
+func init() {
+	proxy.RegisterDialer("smux", NewSmuxDialer)
+}
+
+// NewSmuxDialer returns a smux dialer.
+func NewSmuxDialer(s string, d proxy.Dialer) (proxy.Dialer, error) {
+	u, err := url.Parse(s)
+	if err != nil {
+		log.F("[smux] parse url err: %s", err)
+		return nil, err
+	}
+
+	c := &SmuxClient{
+		dialer: d,
+		addr:   u.Host,
+	}
+
+	return c, nil
+}
+
+// Addr returns forwarder's address.
+func (s *SmuxClient) Addr() string {
+	if s.addr == "" {
+		return s.dialer.Addr()
+	}
+	return s.addr
+}
+
+// Dial connects to the address addr on the network net via the proxy.
+func (s *SmuxClient) Dial(network, addr string) (net.Conn, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if s.session != nil {
+		if c, err := s.session.OpenStream(); err == nil {
+			return c, err
+		}
+		s.session.Close()
+	}
+	if err := s.initConn(); err != nil {
+		return nil, err
+	}
+	return s.session.OpenStream()
+}
+
+// DialUDP connects to the given address via the proxy.
+func (s *SmuxClient) DialUDP(network, addr string) (net.PacketConn, error) {
+	return nil, proxy.ErrNotSupported
+}
+
+func (s *SmuxClient) initConn() error {
+	conn, err := s.dialer.Dial("tcp", s.addr)
+	if err != nil {
+		log.F("[smux] dial to %s error: %s", s.addr, err)
+		return err
+	}
+	s.session, err = smux.Client(conn, nil)
+	return err
+}

proxy/smux/server.go

@@ -0,0 +1,119 @@
+package smux
+
+import (
+	"net"
+	"net/url"
+	"strings"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/smux"
+	"github.com/nadoo/glider/proxy"
+)
+
+// SmuxServer struct.
+type SmuxServer struct {
+	proxy  proxy.Proxy
+	addr   string
+	server proxy.Server
+}
+
+func init() {
+	proxy.RegisterServer("smux", NewSmuxServer)
+}
+
+// NewSmuxServer returns a smux transport layer before the real server.
+func NewSmuxServer(s string, p proxy.Proxy) (proxy.Server, error) {
+	schemes := strings.SplitN(s, ",", 2)
+	u, err := url.Parse(schemes[0])
+	if err != nil {
+		log.F("[smux] parse url err: %s", err)
+		return nil, err
+	}
+
+	m := &SmuxServer{
+		proxy: p,
+		addr:  u.Host,
+	}
+
+	if len(schemes) > 1 {
+		m.server, err = proxy.ServerFromURL(schemes[1], p)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return m, nil
+}
+
+// ListenAndServe listens on server's addr and serves connections.
+func (s *SmuxServer) ListenAndServe() {
+	l, err := net.Listen("tcp", s.addr)
+	if err != nil {
+		log.Fatalf("[smux] failed to listen on %s: %v", s.addr, err)
+		return
+	}
+	defer l.Close()
+
+	log.F("[smux] listening mux on %s", s.addr)
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			log.F("[smux] failed to accept: %v", err)
+			continue
+		}
+
+		go s.Serve(c)
+	}
+}
+
+// Serve serves a connection.
+func (s *SmuxServer) Serve(c net.Conn) {
+	// we know the internal server will close the connection after serve
+	// defer c.Close()
+
+	session, err := smux.Server(c, nil)
+	if err != nil {
+		log.F("[smux] failed to create session: %v", err)
+		return
+	}
+
+	for {
+		// Accept a stream
+		stream, err := session.AcceptStream()
+		if err != nil {
+			session.Close()
+			break
+		}
+		go s.ServeStream(stream)
+	}
+}
+
+// ServeStream serves a smux stream.
+func (s *SmuxServer) ServeStream(c *smux.Stream) {
+	if s.server != nil {
+		s.server.Serve(c)
+		return
+	}
+
+	defer c.Close()
+
+	rc, dialer, err := s.proxy.Dial("tcp", "")
+	if err != nil {
+		log.F("[smux] %s <-> %s via %s, error in dial: %v", c.RemoteAddr(), s.addr, dialer.Addr(), err)
+		s.proxy.Record(dialer, false)
+		return
+	}
+	defer rc.Close()
+
+	log.F("[smux] %s <-> %s", c.RemoteAddr(), dialer.Addr())
+
+	if err = proxy.Relay(c, rc); err != nil {
+		log.F("[smux] %s <-> %s, relay error: %v", c.RemoteAddr(), dialer.Addr(), err)
+		// record remote conn failure only
+		if !strings.Contains(err.Error(), s.addr) {
+			s.proxy.Record(dialer, false)
+		}
+	}
+
+}

proxy/smux/smux.go

@@ -0,0 +1,10 @@
+package smux
+
+import "github.com/nadoo/glider/proxy"
+
+func init() {
+	proxy.AddUsage("smux", `
+Smux scheme:
+  smux://host:port
+`)
+}

proxy/socks4/socks4.go

@@ -0,0 +1,195 @@
+// https://www.openssh.com/txt/socks4.protocol
+
+// socks4 client
+
+package socks4
+
+import (
+	"errors"
+	"io"
+	"net"
+	"net/url"
+	"strconv"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/proxy"
+)
+
+const (
+	// Version is socks4 version number.
+	Version = 4
+	// ConnectCommand connect command byte
+	ConnectCommand = 1
+)
+
+// SOCKS4 is a base socks4 struct.
+type SOCKS4 struct {
+	dialer  proxy.Dialer
+	addr    string
+	socks4a bool
+}
+
+func init() {
+	proxy.RegisterDialer("socks4", NewSocks4Dialer)
+	proxy.RegisterDialer("socks4a", NewSocks4Dialer)
+}
+
+// NewSOCKS4 returns a socks4 proxy.
+func NewSOCKS4(s string, dialer proxy.Dialer) (*SOCKS4, error) {
+	u, err := url.Parse(s)
+	if err != nil {
+		log.F("parse err: %s", err)
+		return nil, err
+	}
+
+	h := &SOCKS4{
+		dialer:  dialer,
+		addr:    u.Host,
+		socks4a: u.Scheme == "socks4a",
+	}
+
+	return h, nil
+}
+
+// NewSocks4Dialer returns a socks4 proxy dialer.
+func NewSocks4Dialer(s string, dialer proxy.Dialer) (proxy.Dialer, error) {
+	return NewSOCKS4(s, dialer)
+}
+
+// Addr returns forwarder's address.
+func (s *SOCKS4) Addr() string {
+	if s.addr == "" {
+		return s.dialer.Addr()
+	}
+	return s.addr
+}
+
+// Dial connects to the address addr on the network net via the SOCKS4 proxy.
+func (s *SOCKS4) Dial(network, addr string) (net.Conn, error) {
+	switch network {
+	case "tcp", "tcp4":
+	default:
+		return nil, errors.New("[socks4] no support for connection type " + network)
+	}
+
+	c, err := s.dialer.Dial(network, s.addr)
+	if err != nil {
+		log.F("[socks4] dial to %s error: %s", s.addr, err)
+		return nil, err
+	}
+
+	if err := s.connect(c, addr); err != nil {
+		c.Close()
+		return nil, err
+	}
+
+	return c, nil
+}
+
+// DialUDP connects to the given address via the proxy.
+func (s *SOCKS4) DialUDP(network, addr string) (pc net.PacketConn, err error) {
+	return nil, proxy.ErrNotSupported
+}
+
+func (s *SOCKS4) lookupIP(host string) (ip net.IP, err error) {
+	ips, err := net.LookupIP(host)
+	if err != nil {
+		return
+	}
+	if len(ips) == 0 {
+		err = errors.New("[socks4] Cannot resolve host: " + host)
+		return
+	}
+	ip = ips[0].To4()
+	if len(ip) != net.IPv4len {
+		err = errors.New("[socks4] IPv6 is not supported by socks4")
+		return
+	}
+	return
+}
+
+// connect takes an existing connection to a socks4 proxy server,
+// and commands the server to extend that connection to target,
+// which must be a canonical address with a host and port.
+func (s *SOCKS4) connect(conn net.Conn, target string) error {
+	host, portStr, err := net.SplitHostPort(target)
+	if err != nil {
+		return err
+	}
+
+	port, err := strconv.ParseUint(portStr, 10, 16)
+	if err != nil {
+		return errors.New("[socks4] failed to parse port number: " + portStr)
+	}
+
+	const baseBufSize = 8 + 1 // 1 is the len(userid)
+	bufSize := baseBufSize
+	var ip net.IP
+	if ip = net.ParseIP(host); ip == nil {
+		if s.socks4a {
+			// The client should set the first three bytes of DSTIP to NULL
+			// and the last byte to a non-zero value.
+			ip = []byte{0, 0, 0, 1}
+			bufSize += len(host) + 1
+		} else {
+			ip, err = s.lookupIP(host)
+			if err != nil {
+				return err
+			}
+		}
+	} else {
+		ip = ip.To4()
+		if ip == nil {
+			return errors.New("[socks4] IPv6 is not supported by socks4")
+		}
+	}
+	// taken from https://github.com/h12w/socks/blob/master/socks.go and https://en.wikipedia.org/wiki/SOCKS
+	buf := pool.GetBuffer(bufSize)
+	defer pool.PutBuffer(buf)
+	copy(buf, []byte{
+		Version,
+		ConnectCommand,
+		byte(port >> 8), // higher byte of destination port
+		byte(port),      // lower byte of destination port (big endian)
+		ip[0], ip[1], ip[2], ip[3],
+		0, // user id
+	})
+	if s.socks4a {
+		copy(buf[baseBufSize:], host)
+		buf[len(buf)-1] = 0
+	}
+
+	resp := pool.GetBuffer(8)
+	defer pool.PutBuffer(resp)
+
+	if _, err := conn.Write(buf); err != nil {
+		return errors.New("[socks4] failed to write greeting to socks4 proxy at " + s.addr + ": " + err.Error())
+	}
+
+	if _, err := io.ReadFull(conn, resp); err != nil {
+		return errors.New("[socks4] failed to read greeting from socks4 proxy at " + s.addr + ": " + err.Error())
+	}
+
+	switch resp[1] {
+	case 0x5a:
+		// request granted
+	case 0x5b:
+		err = errors.New("[socks4] connection request rejected or failed")
+	case 0x5c:
+		err = errors.New("[socks4] connection request request failed because client is not running identd (or not reachable from the server)")
+	case 0x5d:
+		err = errors.New("[socks4] connection request request failed because client's identd could not confirm the user ID in the request")
+	default:
+		err = errors.New("[socks4] connection request failed, unknown error")
+	}
+
+	return err
+}
+
+func init() {
+	proxy.AddUsage("socks4", `
+Socks4 scheme:
+  socks4://host:port
+`)
+}

proxy/socks5/client.go

@@ -0,0 +1,179 @@
+package socks5
+
+import (
+	"errors"
+	"io"
+	"net"
+	"net/netip"
+	"strconv"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/pkg/socks"
+	"github.com/nadoo/glider/proxy"
+)
+
+func init() {
+	proxy.RegisterDialer("socks5", NewSocks5Dialer)
+}
+
+// NewSocks5Dialer returns a socks5 proxy dialer.
+func NewSocks5Dialer(s string, d proxy.Dialer) (proxy.Dialer, error) {
+	return NewSocks5(s, d, nil)
+}
+
+// Addr returns forwarder's address.
+func (s *Socks5) Addr() string {
+	if s.addr == "" {
+		return s.dialer.Addr()
+	}
+	return s.addr
+}
+
+// Dial connects to the address addr on the network net via the SOCKS5 proxy.
+func (s *Socks5) Dial(network, addr string) (net.Conn, error) {
+	c, err := s.dial(network, s.addr)
+	if err != nil {
+		log.F("[socks5]: dial to %s error: %s", s.addr, err)
+		return nil, err
+	}
+
+	if _, err := s.connect(c, addr, socks.CmdConnect); err != nil {
+		c.Close()
+		return nil, err
+	}
+
+	return c, nil
+}
+
+func (s *Socks5) dial(network, addr string) (net.Conn, error) {
+	switch network {
+	case "tcp", "tcp6", "tcp4":
+	default:
+		return nil, errors.New("[socks5]: no support for connection type " + network)
+	}
+
+	c, err := s.dialer.Dial(network, s.addr)
+	if err != nil {
+		log.F("[socks5]: dial to %s error: %s", s.addr, err)
+		return nil, err
+	}
+
+	return c, nil
+}
+
+// DialUDP connects to the given address via the proxy.
+func (s *Socks5) DialUDP(network, addr string) (pc net.PacketConn, err error) {
+	c, err := s.dial("tcp", s.addr)
+	if err != nil {
+		log.F("[socks5] dialudp dial tcp to %s error: %s", s.addr, err)
+		return nil, err
+	}
+
+	var uAddr socks.Addr
+	if uAddr, err = s.connect(c, addr, socks.CmdUDPAssociate); err != nil {
+		c.Close()
+		return nil, err
+	}
+
+	buf := pool.GetBuffer(socks.MaxAddrLen)
+	defer pool.PutBuffer(buf)
+
+	uAddress := uAddr.String()
+	h, p, _ := net.SplitHostPort(uAddress)
+	// if returned bind ip is unspecified
+	if ip, err := netip.ParseAddr(h); err == nil && ip.IsUnspecified() {
+		// indicate using conventional addr
+		h, _, _ = net.SplitHostPort(s.addr)
+		uAddress = net.JoinHostPort(h, p)
+	}
+
+	pc, err = s.dialer.DialUDP(network, uAddress)
+	if err != nil {
+		log.F("[socks5] dialudp to %s error: %s", uAddress, err)
+		return nil, err
+	}
+
+	writeTo, err := net.ResolveUDPAddr("udp", uAddress)
+	if err != nil {
+		log.F("[socks5] resolve addr error: %s", err)
+		return nil, err
+	}
+
+	return NewPktConn(pc, writeTo, socks.ParseAddr(addr), c), err
+}
+
+// connect takes an existing connection to a socks5 proxy server,
+// and commands the server to extend that connection to target,
+// which must be a canonical address with a host and port.
+func (s *Socks5) connect(conn net.Conn, target string, cmd byte) (addr socks.Addr, err error) {
+	// the size here is just an estimate
+	buf := pool.GetBuffer(socks.MaxAddrLen)
+	defer pool.PutBuffer(buf)
+
+	buf = append(buf[:0], Version)
+	if len(s.user) > 0 && len(s.user) < 256 && len(s.password) < 256 {
+		buf = append(buf, 2 /* num auth methods */, socks.AuthNone, socks.AuthPassword)
+	} else {
+		buf = append(buf, 1 /* num auth methods */, socks.AuthNone)
+	}
+
+	if _, err := conn.Write(buf); err != nil {
+		return addr, errors.New("proxy: failed to write greeting to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+	}
+
+	if _, err := io.ReadFull(conn, buf[:2]); err != nil {
+		return addr, errors.New("proxy: failed to read greeting from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+	}
+	if buf[0] != Version {
+		return addr, errors.New("proxy: SOCKS5 proxy at " + s.addr + " has unexpected version " + strconv.Itoa(int(buf[0])))
+	}
+	if buf[1] == 0xff {
+		return addr, errors.New("proxy: SOCKS5 proxy at " + s.addr + " requires authentication")
+	}
+
+	if buf[1] == socks.AuthPassword {
+		buf = buf[:0]
+		buf = append(buf, 1 /* password protocol version */)
+		buf = append(buf, uint8(len(s.user)))
+		buf = append(buf, s.user...)
+		buf = append(buf, uint8(len(s.password)))
+		buf = append(buf, s.password...)
+
+		if _, err := conn.Write(buf); err != nil {
+			return addr, errors.New("proxy: failed to write authentication request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+		}
+
+		if _, err := io.ReadFull(conn, buf[:2]); err != nil {
+			return addr, errors.New("proxy: failed to read authentication reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+		}
+
+		if buf[1] != 0 {
+			return addr, errors.New("proxy: SOCKS5 proxy at " + s.addr + " rejected username/password")
+		}
+	}
+
+	buf = buf[:0]
+	buf = append(buf, Version, cmd, 0 /* reserved */)
+	buf = append(buf, socks.ParseAddr(target)...)
+
+	if _, err := conn.Write(buf); err != nil {
+		return addr, errors.New("proxy: failed to write connect request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+	}
+
+	// read VER REP RSV
+	if _, err := io.ReadFull(conn, buf[:3]); err != nil {
+		return addr, errors.New("proxy: failed to read connect reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+	}
+
+	failure := "unknown error"
+	if int(buf[1]) < len(socks.Errors) {
+		failure = socks.Errors[buf[1]].Error()
+	}
+
+	if len(failure) > 0 {
+		return addr, errors.New("proxy: SOCKS5 proxy at " + s.addr + " failed to connect: " + failure)
+	}
+
+	return socks.ReadAddr(conn)
+}

proxy/socks5/packet.go

@@ -0,0 +1,127 @@
+package socks5
+
+import (
+	"errors"
+	"net"
+
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/pkg/socks"
+)
+
+// PktConn .
+type PktConn struct {
+	net.PacketConn
+	ctrlConn net.Conn // tcp control conn
+	writeTo  net.Addr // write to and read from addr
+	target   socks.Addr
+}
+
+// NewPktConn returns a PktConn, the writeAddr must be *net.UDPAddr or *net.UnixAddr.
+func NewPktConn(c net.PacketConn, writeAddr net.Addr, targetAddr socks.Addr, ctrlConn net.Conn) *PktConn {
+	pc := &PktConn{
+		PacketConn: c,
+		writeTo:    writeAddr,
+		target:     targetAddr,
+		ctrlConn:   ctrlConn,
+	}
+
+	if ctrlConn != nil {
+		go func() {
+			buf := pool.GetBuffer(1)
+			defer pool.PutBuffer(buf)
+			for {
+				_, err := ctrlConn.Read(buf)
+				if err, ok := err.(net.Error); ok && err.Timeout() {
+					continue
+				}
+				// log.F("[socks5] dialudp udp associate end")
+				return
+			}
+		}()
+	}
+
+	return pc
+}
+
+// ReadFrom overrides the original function from net.PacketConn.
+func (pc *PktConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, _, target, err := pc.readFrom(b)
+	return n, target, err
+}
+
+func (pc *PktConn) readFrom(b []byte) (int, net.Addr, net.Addr, error) {
+	buf := pool.GetBuffer(len(b))
+	defer pool.PutBuffer(buf)
+
+	n, raddr, err := pc.PacketConn.ReadFrom(buf)
+	if err != nil {
+		return n, raddr, nil, err
+	}
+
+	if n < 3 {
+		return n, raddr, nil, errors.New("not enough size to get addr")
+	}
+
+	// https://www.rfc-editor.org/rfc/rfc1928#section-7
+	// +----+------+------+----------+----------+----------+
+	// |RSV | FRAG | ATYP | DST.ADDR | DST.PORT |   DATA   |
+	// +----+------+------+----------+----------+----------+
+	// | 2  |  1   |  1   | Variable |    2     | Variable |
+	// +----+------+------+----------+----------+----------+
+	tgtAddr := socks.SplitAddr(buf[3:n])
+	if tgtAddr == nil {
+		return n, raddr, nil, errors.New("can not get target addr")
+	}
+
+	target, err := net.ResolveUDPAddr("udp", tgtAddr.String())
+	if err != nil {
+		return n, raddr, nil, errors.New("wrong target addr")
+	}
+
+	if pc.writeTo == nil {
+		pc.writeTo = raddr
+	}
+
+	if pc.target == nil {
+		pc.target = make([]byte, len(tgtAddr))
+		copy(pc.target, tgtAddr)
+	}
+
+	n = copy(b, buf[3+len(tgtAddr):n])
+	return n, raddr, target, err
+}
+
+// WriteTo overrides the original function from net.PacketConn.
+func (pc *PktConn) WriteTo(b []byte, addr net.Addr) (int, error) {
+	target := pc.target
+	if addr != nil {
+		target = socks.ParseAddr(addr.String())
+	}
+
+	if target == nil {
+		return 0, errors.New("invalid addr")
+	}
+
+	buf := pool.GetBytesBuffer()
+	defer pool.PutBytesBuffer(buf)
+
+	buf.Write([]byte{0, 0, 0})
+	tgtLen, _ := buf.Write(target)
+	buf.Write(b)
+
+	n, err := pc.PacketConn.WriteTo(buf.Bytes(), pc.writeTo)
+	if n > tgtLen+3 {
+		return n - tgtLen - 3, err
+	}
+
+	return 0, err
+}
+
+// Close .
+func (pc *PktConn) Close() error {
+	if pc.ctrlConn != nil {
+		pc.ctrlConn.Close()
+	}
+
+	return pc.PacketConn.Close()
+}

proxy/socks5/server.go

@@ -0,0 +1,299 @@
+package socks5
+
+import (
+	"errors"
+	"io"
+	"net"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/pkg/socks"
+	"github.com/nadoo/glider/proxy"
+)
+
+var nm sync.Map
+
+func init() {
+	proxy.RegisterServer("socks5", NewSocks5Server)
+}
+
+// NewSocks5Server returns a socks5 proxy server.
+func NewSocks5Server(s string, p proxy.Proxy) (proxy.Server, error) {
+	return NewSocks5(s, nil, p)
+}
+
+// ListenAndServe serves socks5 requests.
+func (s *Socks5) ListenAndServe() {
+	go s.ListenAndServeUDP()
+	s.ListenAndServeTCP()
+}
+
+// ListenAndServeTCP listen and serve on tcp port.
+func (s *Socks5) ListenAndServeTCP() {
+	l, err := net.Listen("tcp", s.addr)
+	if err != nil {
+		log.Fatalf("[socks5] failed to listen on %s: %v", s.addr, err)
+		return
+	}
+
+	log.F("[socks5] listening TCP on %s", s.addr)
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			log.F("[socks5] failed to accept: %v", err)
+			continue
+		}
+
+		go s.Serve(c)
+	}
+}
+
+// Serve serves a connection.
+func (s *Socks5) Serve(c net.Conn) {
+	defer c.Close()
+
+	if c, ok := c.(*net.TCPConn); ok {
+		c.SetKeepAlive(true)
+	}
+
+	tgt, err := s.handshake(c)
+	if err != nil {
+		// UDP: keep the connection until disconnect then free the UDP socket
+		if err == socks.Errors[9] {
+			buf := pool.GetBuffer(1)
+			defer pool.PutBuffer(buf)
+			// block here
+			for {
+				_, err := c.Read(buf)
+				if err, ok := err.(net.Error); ok && err.Timeout() {
+					continue
+				}
+				// log.F("[socks5] servetcp udp associate end")
+				return
+			}
+		}
+
+		log.F("[socks5] failed in handshake with %s: %v", c.RemoteAddr(), err)
+		return
+	}
+
+	rc, dialer, err := s.proxy.Dial("tcp", tgt.String())
+	if err != nil {
+		log.F("[socks5] %s <-> %s via %s, error in dial: %v", c.RemoteAddr(), tgt, dialer.Addr(), err)
+		return
+	}
+	defer rc.Close()
+
+	log.F("[socks5] %s <-> %s via %s", c.RemoteAddr(), tgt, dialer.Addr())
+
+	if err = proxy.Relay(c, rc); err != nil {
+		log.F("[socks5] %s <-> %s via %s, relay error: %v", c.RemoteAddr(), tgt, dialer.Addr(), err)
+		// record remote conn failure only
+		if !strings.Contains(err.Error(), s.addr) {
+			s.proxy.Record(dialer, false)
+		}
+	}
+}
+
+// ListenAndServeUDP serves udp requests.
+func (s *Socks5) ListenAndServeUDP() {
+	lc, err := net.ListenPacket("udp", s.addr)
+	if err != nil {
+		log.Fatalf("[socks5] failed to listen on UDP %s: %v", s.addr, err)
+		return
+	}
+	defer lc.Close()
+
+	log.F("[socks5] listening UDP on %s", s.addr)
+
+	s.ServePacket(lc)
+}
+
+// ServePacket implements proxy.PacketServer.
+func (s *Socks5) ServePacket(pc net.PacketConn) {
+	for {
+		c := NewPktConn(pc, nil, nil, nil)
+		buf := pool.GetBuffer(proxy.UDPBufSize)
+
+		n, srcAddr, dstAddr, err := c.readFrom(buf)
+		if err != nil {
+			log.F("[socks5u] remote read error: %v", err)
+			continue
+		}
+
+		var session *Session
+		sessionKey := srcAddr.String()
+
+		v, ok := nm.Load(sessionKey)
+		if !ok || v == nil {
+			session = newSession(sessionKey, srcAddr, dstAddr, c)
+			nm.Store(sessionKey, session)
+			go s.serveSession(session)
+		} else {
+			session = v.(*Session)
+		}
+
+		session.msgCh <- message{dstAddr, buf[:n]}
+	}
+}
+
+func (s *Socks5) serveSession(session *Session) {
+	dstPC, dialer, err := s.proxy.DialUDP("udp", session.srcPC.target.String())
+	if err != nil {
+		log.F("[socks5u] remote dial error: %v", err)
+		nm.Delete(session.key)
+		return
+	}
+	defer dstPC.Close()
+
+	go func() {
+		proxy.CopyUDP(session.srcPC, nil, dstPC, 2*time.Minute, 5*time.Second)
+		nm.Delete(session.key)
+		close(session.finCh)
+	}()
+
+	log.F("[socks5u] %s <-> %s via %s", session.src, session.srcPC.target, dialer.Addr())
+
+	for {
+		select {
+		case msg := <-session.msgCh:
+			_, err = dstPC.WriteTo(msg.msg, msg.dst)
+			if err != nil {
+				log.F("[socks5u] writeTo %s error: %v", msg.dst, err)
+			}
+			pool.PutBuffer(msg.msg)
+			msg.msg = nil
+		case <-session.finCh:
+			return
+		}
+	}
+}
+
+type message struct {
+	dst net.Addr
+	msg []byte
+}
+
+// Session is a udp session
+type Session struct {
+	key   string
+	src   net.Addr
+	dst   net.Addr
+	srcPC *PktConn
+	msgCh chan message
+	finCh chan struct{}
+}
+
+func newSession(key string, src, dst net.Addr, srcPC *PktConn) *Session {
+	return &Session{key, src, dst, srcPC, make(chan message, 32), make(chan struct{})}
+}
+
+// Handshake fast-tracks SOCKS initialization to get target address to connect.
+func (s *Socks5) handshake(c net.Conn) (socks.Addr, error) {
+	// Read RFC 1928 for request and reply structure and sizes
+	buf := pool.GetBuffer(socks.MaxAddrLen)
+	defer pool.PutBuffer(buf)
+
+	// read VER, NMETHODS, METHODS
+	if _, err := io.ReadFull(c, buf[:2]); err != nil {
+		return nil, err
+	}
+
+	nmethods := buf[1]
+	if _, err := io.ReadFull(c, buf[:nmethods]); err != nil {
+		return nil, err
+	}
+
+	// write VER METHOD
+	if s.user != "" && s.password != "" {
+		_, err := c.Write([]byte{Version, socks.AuthPassword})
+		if err != nil {
+			return nil, err
+		}
+
+		_, err = io.ReadFull(c, buf[:2])
+		if err != nil {
+			return nil, err
+		}
+
+		// Get username
+		userLen := int(buf[1])
+		if userLen <= 0 {
+			c.Write([]byte{1, 1})
+			return nil, errors.New("auth failed: wrong username length")
+		}
+
+		if _, err := io.ReadFull(c, buf[:userLen]); err != nil {
+			return nil, errors.New("auth failed: cannot get username")
+		}
+		user := string(buf[:userLen])
+
+		// Get password
+		_, err = c.Read(buf[:1])
+		if err != nil {
+			return nil, errors.New("auth failed: cannot get password len")
+		}
+
+		passLen := int(buf[0])
+		if passLen <= 0 {
+			c.Write([]byte{1, 1})
+			return nil, errors.New("auth failed: wrong password length")
+		}
+
+		_, err = io.ReadFull(c, buf[:passLen])
+		if err != nil {
+			return nil, errors.New("auth failed: cannot get password")
+		}
+		pass := string(buf[:passLen])
+
+		// Verify
+		if user != s.user || pass != s.password {
+			_, err = c.Write([]byte{1, 1})
+			if err != nil {
+				return nil, err
+			}
+			return nil, errors.New("auth failed, authinfo: " + user + ":" + pass)
+		}
+
+		// Response auth state
+		_, err = c.Write([]byte{1, 0})
+		if err != nil {
+			return nil, err
+		}
+
+	} else if _, err := c.Write([]byte{Version, socks.AuthNone}); err != nil {
+		return nil, err
+	}
+
+	// read VER CMD RSV ATYP DST.ADDR DST.PORT
+	if _, err := io.ReadFull(c, buf[:3]); err != nil {
+		return nil, err
+	}
+	cmd := buf[1]
+	addr, err := socks.ReadAddr(c)
+	if err != nil {
+		return nil, err
+	}
+	switch cmd {
+	case socks.CmdConnect:
+		_, err = c.Write([]byte{5, 0, 0, 1, 0, 0, 0, 0, 0, 0}) // SOCKS v5, reply succeeded
+	case socks.CmdUDPAssociate:
+		listenAddr := socks.ParseAddr(c.LocalAddr().String())
+		if listenAddr == nil { // maybe it's unix socket
+			listenAddr = socks.ParseAddr("127.0.0.1:0")
+		}
+		_, err = c.Write(append([]byte{5, 0, 0}, listenAddr...)) // SOCKS v5, reply succeeded
+		if err != nil {
+			return nil, socks.Errors[7]
+		}
+		err = socks.Errors[9]
+	default:
+		return nil, socks.Errors[7]
+	}
+
+	return addr, err // skip VER, CMD, RSV fields
+}

proxy/socks5/socks5.go

@@ -0,0 +1,60 @@
+// https://www.rfc-editor.org/rfc/rfc1928
+
+// socks5 client:
+// https://github.com/golang/net/tree/master/proxy
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package socks5 implements a socks5 proxy.
+package socks5
+
+import (
+	"net/url"
+
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/proxy"
+)
+
+// Version is socks5 version number.
+const Version = 5
+
+// Socks5 is a base socks5 struct.
+type Socks5 struct {
+	dialer   proxy.Dialer
+	proxy    proxy.Proxy
+	addr     string
+	user     string
+	password string
+}
+
+// NewSocks5 returns a Proxy that makes SOCKS v5 connections to the given address.
+// with an optional username and password. (RFC 1928)
+func NewSocks5(s string, d proxy.Dialer, p proxy.Proxy) (*Socks5, error) {
+	u, err := url.Parse(s)
+	if err != nil {
+		log.F("parse err: %s", err)
+		return nil, err
+	}
+
+	addr := u.Host
+	user := u.User.Username()
+	pass, _ := u.User.Password()
+
+	h := &Socks5{
+		dialer:   d,
+		proxy:    p,
+		addr:     addr,
+		user:     user,
+		password: pass,
+	}
+
+	return h, nil
+}
+
+func init() {
+	proxy.AddUsage("socks5", `
+Socks5 scheme:
+  socks5://[user:pass@]host:port
+`)
+}

proxy/ss/cipher/cipher.go

@@ -0,0 +1,143 @@
+package cipher
+
+import (
+	"crypto/md5"
+	"errors"
+	"net"
+	"strings"
+
+	"github.com/nadoo/glider/proxy/ss/cipher/shadowaead"
+	"github.com/nadoo/glider/proxy/ss/cipher/shadowstream"
+)
+
+// Cipher interface.
+type Cipher interface {
+	StreamConnCipher
+	PacketConnCipher
+}
+
+// StreamConnCipher is the stream connection cipher.
+type StreamConnCipher interface {
+	StreamConn(net.Conn) net.Conn
+}
+
+// PacketConnCipher is the packet connection cipher.
+type PacketConnCipher interface {
+	PacketConn(net.PacketConn) net.PacketConn
+}
+
+// ErrCipherNotSupported occurs when a cipher is not supported (likely because of security concerns).
+var ErrCipherNotSupported = errors.New("cipher not supported")
+
+// List of AEAD ciphers: key size in bytes and constructor
+var aeadList = map[string]struct {
+	KeySize int
+	New     func([]byte) (shadowaead.Cipher, error)
+}{
+	"AEAD_AES_128_GCM":       {16, shadowaead.AESGCM},
+	"AEAD_AES_192_GCM":       {24, shadowaead.AESGCM},
+	"AEAD_AES_256_GCM":       {32, shadowaead.AESGCM},
+	"AEAD_CHACHA20_POLY1305": {32, shadowaead.Chacha20Poly1305},
+
+	// http://shadowsocks.org/en/spec/AEAD-Ciphers.html
+	// not listed in spec
+	"AEAD_XCHACHA20_POLY1305": {32, shadowaead.XChacha20Poly1305},
+}
+
+// List of stream ciphers: key size in bytes and constructor
+var streamList = map[string]struct {
+	KeySize int
+	New     func(key []byte) (shadowstream.Cipher, error)
+}{
+	"AES-128-CTR":   {16, shadowstream.AESCTR},
+	"AES-192-CTR":   {24, shadowstream.AESCTR},
+	"AES-256-CTR":   {32, shadowstream.AESCTR},
+	"AES-128-CFB":   {16, shadowstream.AESCFB},
+	"AES-192-CFB":   {24, shadowstream.AESCFB},
+	"AES-256-CFB":   {32, shadowstream.AESCFB},
+	"CHACHA20-IETF": {32, shadowstream.Chacha20IETF},
+	"XCHACHA20":     {32, shadowstream.Xchacha20},
+
+	// http://shadowsocks.org/en/spec/Stream-Ciphers.html
+	// marked as "DO NOT USE"
+	"CHACHA20": {32, shadowstream.ChaCha20},
+	"RC4-MD5":  {16, shadowstream.RC4MD5},
+}
+
+// PickCipher returns a Cipher of the given name. Derive key from password if given key is empty.
+func PickCipher(name string, key []byte, password string) (Cipher, error) {
+	name = strings.ToUpper(name)
+
+	switch name {
+	case "DUMMY", "NONE":
+		return &dummy{}, nil
+	case "CHACHA20-IETF-POLY1305":
+		name = "AEAD_CHACHA20_POLY1305"
+	case "XCHACHA20-IETF-POLY1305":
+		name = "AEAD_XCHACHA20_POLY1305"
+	case "AES-128-GCM":
+		name = "AEAD_AES_128_GCM"
+	case "AES-192-GCM":
+		name = "AEAD_AES_192_GCM"
+	case "AES-256-GCM":
+		name = "AEAD_AES_256_GCM"
+	}
+
+	if choice, ok := aeadList[name]; ok {
+		if len(key) == 0 {
+			key = kdf(password, choice.KeySize)
+		}
+		if len(key) != choice.KeySize {
+			return nil, shadowaead.KeySizeError(choice.KeySize)
+		}
+		aead, err := choice.New(key)
+		return &aeadCipher{aead}, err
+	}
+
+	if choice, ok := streamList[name]; ok {
+		if len(key) == 0 {
+			key = kdf(password, choice.KeySize)
+		}
+		if len(key) != choice.KeySize {
+			return nil, shadowstream.KeySizeError(choice.KeySize)
+		}
+		ciph, err := choice.New(key)
+		return &streamCipher{ciph}, err
+	}
+
+	return nil, ErrCipherNotSupported
+}
+
+type aeadCipher struct{ shadowaead.Cipher }
+
+func (aead *aeadCipher) StreamConn(c net.Conn) net.Conn { return shadowaead.NewConn(c, aead) }
+func (aead *aeadCipher) PacketConn(c net.PacketConn) net.PacketConn {
+	return shadowaead.NewPacketConn(c, aead)
+}
+
+type streamCipher struct{ shadowstream.Cipher }
+
+func (ciph *streamCipher) StreamConn(c net.Conn) net.Conn { return shadowstream.NewConn(c, ciph) }
+func (ciph *streamCipher) PacketConn(c net.PacketConn) net.PacketConn {
+	return shadowstream.NewPacketConn(c, ciph)
+}
+
+// dummy cipher does not encrypt
+type dummy struct{}
+
+func (dummy) StreamConn(c net.Conn) net.Conn             { return c }
+func (dummy) PacketConn(c net.PacketConn) net.PacketConn { return c }
+
+// key-derivation function from original Shadowsocks
+func kdf(password string, keyLen int) []byte {
+	var b, prev []byte
+	h := md5.New()
+	for len(b) < keyLen {
+		h.Write(prev)
+		h.Write([]byte(password))
+		b = h.Sum(b)
+		prev = b[len(b)-h.Size():]
+		h.Reset()
+	}
+	return b[:keyLen]
+}

proxy/ss/cipher/shadowaead/cipher.go

@@ -0,0 +1,94 @@
+package shadowaead
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/sha1"
+	"io"
+	"strconv"
+
+	"golang.org/x/crypto/chacha20poly1305"
+	"golang.org/x/crypto/hkdf"
+)
+
+// Cipher generates a pair of stream ciphers for encryption and decryption.
+type Cipher interface {
+	KeySize() int
+	SaltSize() int
+	Encrypter(salt []byte) (cipher.AEAD, error)
+	Decrypter(salt []byte) (cipher.AEAD, error)
+}
+
+// KeySizeError is an error about the key size.
+type KeySizeError int
+
+func (e KeySizeError) Error() string {
+	return "key size error: need " + strconv.Itoa(int(e)) + " bytes"
+}
+
+func hkdfSHA1(secret, salt, info, outkey []byte) {
+	r := hkdf.New(sha1.New, secret, salt, info)
+	if _, err := io.ReadFull(r, outkey); err != nil {
+		panic(err) // should never happen
+	}
+}
+
+type metaCipher struct {
+	psk      []byte
+	makeAEAD func(key []byte) (cipher.AEAD, error)
+}
+
+func (a *metaCipher) KeySize() int { return len(a.psk) }
+func (a *metaCipher) SaltSize() int {
+	if ks := a.KeySize(); ks > 16 {
+		return ks
+	}
+	return 16
+}
+func (a *metaCipher) Encrypter(salt []byte) (cipher.AEAD, error) {
+	subkey := make([]byte, a.KeySize())
+	hkdfSHA1(a.psk, salt, []byte("ss-subkey"), subkey)
+	return a.makeAEAD(subkey)
+}
+func (a *metaCipher) Decrypter(salt []byte) (cipher.AEAD, error) {
+	subkey := make([]byte, a.KeySize())
+	hkdfSHA1(a.psk, salt, []byte("ss-subkey"), subkey)
+	return a.makeAEAD(subkey)
+}
+
+func aesGCM(key []byte) (cipher.AEAD, error) {
+	blk, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	return cipher.NewGCM(blk)
+}
+
+// AESGCM creates a new Cipher with a pre-shared key. len(psk) must be
+// one of 16, 24, or 32 to select AES-128/196/256-GCM.
+func AESGCM(psk []byte) (Cipher, error) {
+	switch l := len(psk); l {
+	case 16, 24, 32: // AES 128/196/256
+	default:
+		return nil, aes.KeySizeError(l)
+	}
+	return &metaCipher{psk: psk, makeAEAD: aesGCM}, nil
+}
+
+// Chacha20Poly1305 creates a new Cipher with a pre-shared key. len(psk)
+// must be 32.
+func Chacha20Poly1305(psk []byte) (Cipher, error) {
+	if len(psk) != chacha20poly1305.KeySize {
+		return nil, KeySizeError(chacha20poly1305.KeySize)
+	}
+	return &metaCipher{psk: psk, makeAEAD: chacha20poly1305.New}, nil
+}
+
+// XChacha20Poly1305 creates a new Cipher with a pre-shared key. len(psk)
+// must be 32.
+func XChacha20Poly1305(psk []byte) (Cipher, error) {
+	if len(psk) != chacha20poly1305.KeySize {
+		return nil, KeySizeError(chacha20poly1305.KeySize)
+	}
+	return &metaCipher{psk: psk, makeAEAD: chacha20poly1305.NewX}, nil
+}

proxy/ss/cipher/shadowaead/conn.go

@@ -0,0 +1,67 @@
+package shadowaead
+
+import (
+	"crypto/rand"
+	"io"
+	"net"
+)
+
+type streamConn struct {
+	net.Conn
+	Cipher
+	r *reader
+	w *writer
+}
+
+// NewConn wraps a stream-oriented net.Conn with cipher.
+func NewConn(c net.Conn, ciph Cipher) net.Conn { return &streamConn{Conn: c, Cipher: ciph} }
+
+func (c *streamConn) initReader() error {
+	salt := make([]byte, c.SaltSize())
+	if _, err := io.ReadFull(c.Conn, salt); err != nil {
+		return err
+	}
+
+	aead, err := c.Decrypter(salt)
+	if err != nil {
+		return err
+	}
+
+	c.r = newReader(c.Conn, aead)
+	return nil
+}
+
+func (c *streamConn) Read(b []byte) (int, error) {
+	if c.r == nil {
+		if err := c.initReader(); err != nil {
+			return 0, err
+		}
+	}
+	return c.r.Read(b)
+}
+
+func (c *streamConn) initWriter() error {
+	salt := make([]byte, c.SaltSize())
+	if _, err := io.ReadFull(rand.Reader, salt); err != nil {
+		return err
+	}
+	aead, err := c.Encrypter(salt)
+	if err != nil {
+		return err
+	}
+	_, err = c.Conn.Write(salt)
+	if err != nil {
+		return err
+	}
+	c.w = newWriter(c.Conn, aead)
+	return nil
+}
+
+func (c *streamConn) Write(b []byte) (int, error) {
+	if c.w == nil {
+		if err := c.initWriter(); err != nil {
+			return 0, err
+		}
+	}
+	return c.w.Write(b)
+}

proxy/ss/cipher/shadowaead/packet.go

@@ -0,0 +1,97 @@
+package shadowaead
+
+import (
+	"crypto/rand"
+	"errors"
+	"io"
+	"net"
+	"sync"
+)
+
+// ErrShortPacket means that the packet is too short for a valid encrypted packet.
+var ErrShortPacket = errors.New("short packet")
+
+var _zerononce [128]byte // read-only. 128 bytes is more than enough.
+
+// Pack encrypts plaintext using Cipher with a randomly generated salt and
+// returns a slice of dst containing the encrypted packet and any error occurred.
+// Ensure len(dst) >= ciph.SaltSize() + len(plaintext) + aead.Overhead().
+func Pack(dst, plaintext []byte, ciph Cipher) ([]byte, error) {
+	saltSize := ciph.SaltSize()
+	salt := dst[:saltSize]
+	if _, err := io.ReadFull(rand.Reader, salt); err != nil {
+		return nil, err
+	}
+
+	aead, err := ciph.Encrypter(salt)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(dst) < saltSize+len(plaintext)+aead.Overhead() {
+		return nil, io.ErrShortBuffer
+	}
+	b := aead.Seal(dst[saltSize:saltSize], _zerononce[:aead.NonceSize()], plaintext, nil)
+	return dst[:saltSize+len(b)], nil
+}
+
+// Unpack decrypts pkt using Cipher and returns a slice of dst containing the decrypted payload and any error occurred.
+// Ensure len(dst) >= len(pkt) - aead.SaltSize() - aead.Overhead().
+func Unpack(dst, pkt []byte, ciph Cipher) ([]byte, error) {
+	saltSize := ciph.SaltSize()
+	if len(pkt) < saltSize {
+		return nil, ErrShortPacket
+	}
+	salt := pkt[:saltSize]
+	aead, err := ciph.Decrypter(salt)
+	if err != nil {
+		return nil, err
+	}
+	if len(pkt) < saltSize+aead.Overhead() {
+		return nil, ErrShortPacket
+	}
+	if saltSize+len(dst)+aead.Overhead() < len(pkt) {
+		return nil, io.ErrShortBuffer
+	}
+	b, err := aead.Open(dst[:0], _zerononce[:aead.NonceSize()], pkt[saltSize:], nil)
+	return b, err
+}
+
+type packetConn struct {
+	net.PacketConn
+	Cipher
+	sync.Mutex
+	buf []byte // write lock
+}
+
+// NewPacketConn wraps a net.PacketConn with cipher
+func NewPacketConn(c net.PacketConn, ciph Cipher) net.PacketConn {
+	const maxPacketSize = 64 * 1024
+	return &packetConn{PacketConn: c, Cipher: ciph, buf: make([]byte, maxPacketSize)}
+}
+
+// WriteTo encrypts b and write to addr using the embedded PacketConn.
+func (c *packetConn) WriteTo(b []byte, addr net.Addr) (int, error) {
+	c.Lock()
+	defer c.Unlock()
+	buf, err := Pack(c.buf, b, c)
+	if err != nil {
+		return 0, err
+	}
+	_, err = c.PacketConn.WriteTo(buf, addr)
+	return len(b), err
+}
+
+// ReadFrom reads from the embedded PacketConn and decrypts into b.
+func (c *packetConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, addr, err := c.PacketConn.ReadFrom(b)
+	if err != nil {
+		return n, addr, err
+	}
+	bb, err := Unpack(b[c.Cipher.SaltSize():], b[:n], c)
+	if err != nil {
+		return n, addr, err
+	}
+	copy(b, bb)
+	return len(bb), addr, err
+}

proxy/ss/cipher/shadowaead/stream.go

@@ -0,0 +1,150 @@
+// protocol:
+// format: [encrypted payload length] [Overhead] [encrypted payload] [Overhead]
+// sizes: 2 bytes, aead.Overhead() bytes, n bytes, aead.Overhead() bytes
+// max(n): 0x3FFF
+
+package shadowaead
+
+import (
+	"crypto/cipher"
+	"encoding/binary"
+	"io"
+
+	"github.com/nadoo/glider/pkg/pool"
+)
+
+const (
+	lenSize = 2
+	// max payload size: 16383 from ss-libev aead.c: CHUNK_SIZE_MASK
+	maxPayload = 0x3FFF
+	// buf size, shoud enough to save lenSize + aead.Overhead() + maxPayload + aead.Overhead()
+	bufSize = 17 << 10
+)
+
+type writer struct {
+	io.Writer
+	cipher.AEAD
+	nonce [32]byte
+}
+
+// NewWriter wraps an io.Writer with AEAD encryption.
+func NewWriter(w io.Writer, aead cipher.AEAD) io.Writer { return newWriter(w, aead) }
+
+func newWriter(w io.Writer, aead cipher.AEAD) *writer {
+	return &writer{Writer: w, AEAD: aead}
+}
+
+// Write encrypts p and writes to the embedded io.Writer.
+func (w *writer) Write(p []byte) (n int, err error) {
+	buf := pool.GetBuffer(bufSize)
+	defer pool.PutBuffer(buf)
+
+	nonce := w.nonce[:w.NonceSize()]
+	encLenSize := lenSize + w.Overhead()
+	for nw := maxPayload; n < len(p); n += nw {
+		if left := len(p) - n; left < maxPayload {
+			nw = left
+		}
+
+		binary.BigEndian.PutUint16(buf[:lenSize], uint16(nw))
+		w.Seal(buf[:0], nonce, buf[:lenSize], nil)
+		increment(nonce)
+
+		w.Seal(buf[:encLenSize], nonce, p[n:n+nw], nil)
+		increment(nonce)
+
+		if _, err = w.Writer.Write(buf[:encLenSize+nw+w.Overhead()]); err != nil {
+			return
+		}
+	}
+	return
+}
+
+type reader struct {
+	io.Reader
+	cipher.AEAD
+	nonce  [32]byte
+	buf    []byte
+	offset int
+}
+
+// NewReader wraps an io.Reader with AEAD decryption.
+func NewReader(r io.Reader, aead cipher.AEAD) io.Reader { return newReader(r, aead) }
+
+func newReader(r io.Reader, aead cipher.AEAD) *reader {
+	return &reader{Reader: r, AEAD: aead}
+}
+
+// NOTE: len(p) MUST >= max payload size + AEAD overhead.
+func (r *reader) read(p []byte) (int, error) {
+	nonce := r.nonce[:r.NonceSize()]
+
+	// read encrypted lenSize + overhead
+	p = p[:lenSize+r.Overhead()]
+	if _, err := io.ReadFull(r.Reader, p); err != nil {
+		return 0, err
+	}
+
+	// decrypt lenSize
+	_, err := r.Open(p[:0], nonce, p, nil)
+	increment(nonce)
+	if err != nil {
+		return 0, err
+	}
+
+	// get payload size
+	size := int(binary.BigEndian.Uint16(p[:lenSize]))
+
+	// read encrypted payload + overhead
+	p = p[:size+r.Overhead()]
+	if _, err := io.ReadFull(r.Reader, p); err != nil {
+		return 0, err
+	}
+
+	// decrypt payload
+	_, err = r.Open(p[:0], nonce, p, nil)
+	increment(nonce)
+
+	if err != nil {
+		return 0, err
+	}
+
+	return size, nil
+}
+
+func (r *reader) Read(p []byte) (int, error) {
+	if r.buf == nil {
+		if len(p) >= maxPayload+r.Overhead() {
+			return r.read(p)
+		}
+
+		buf := pool.GetBuffer(bufSize)
+		n, err := r.read(buf)
+		if err != nil {
+			pool.PutBuffer(buf)
+			return 0, err
+		}
+
+		r.buf = buf[:n]
+		r.offset = 0
+	}
+
+	n := copy(p, r.buf[r.offset:])
+	r.offset += n
+	if r.offset == len(r.buf) {
+		pool.PutBuffer(r.buf)
+		r.buf = nil
+	}
+
+	return n, nil
+}
+
+// increment little-endian encoded unsigned integer b. Wrap around on overflow.
+func increment(b []byte) {
+	for i := range b {
+		b[i]++
+		if b[i] != 0 {
+			return
+		}
+	}
+}

proxy/ss/cipher/shadowstream/cipher.go

@@ -0,0 +1,143 @@
+package shadowstream
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/md5"
+	"crypto/rc4"
+	"strconv"
+
+	"github.com/aead/chacha20"
+	"github.com/aead/chacha20/chacha"
+)
+
+// Cipher generates a pair of stream ciphers for encryption and decryption.
+type Cipher interface {
+	IVSize() int
+	Encrypter(iv []byte) cipher.Stream
+	Decrypter(iv []byte) cipher.Stream
+}
+
+// KeySizeError is an error about the key size.
+type KeySizeError int
+
+func (e KeySizeError) Error() string {
+	return "key size error: need " + strconv.Itoa(int(e)) + " bytes"
+}
+
+// CTR mode
+type ctrStream struct{ cipher.Block }
+
+func (b *ctrStream) IVSize() int                       { return b.BlockSize() }
+func (b *ctrStream) Decrypter(iv []byte) cipher.Stream { return b.Encrypter(iv) }
+func (b *ctrStream) Encrypter(iv []byte) cipher.Stream { return cipher.NewCTR(b, iv) }
+
+// AESCTR returns an aesctr cipher.
+func AESCTR(key []byte) (Cipher, error) {
+	blk, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	return &ctrStream{blk}, nil
+}
+
+// CFB mode
+type cfbStream struct{ cipher.Block }
+
+func (b *cfbStream) IVSize() int                       { return b.BlockSize() }
+func (b *cfbStream) Decrypter(iv []byte) cipher.Stream { return cipher.NewCFBDecrypter(b, iv) }
+func (b *cfbStream) Encrypter(iv []byte) cipher.Stream { return cipher.NewCFBEncrypter(b, iv) }
+
+// AESCFB returns an aescfb cipher.
+func AESCFB(key []byte) (Cipher, error) {
+	blk, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	return &cfbStream{blk}, nil
+}
+
+// IETF-variant of chacha20
+type chacha20ietfkey []byte
+
+func (k chacha20ietfkey) IVSize() int                       { return chacha.INonceSize }
+func (k chacha20ietfkey) Decrypter(iv []byte) cipher.Stream { return k.Encrypter(iv) }
+func (k chacha20ietfkey) Encrypter(iv []byte) cipher.Stream {
+	ciph, err := chacha20.NewCipher(iv, k)
+	if err != nil {
+		panic(err) // should never happen
+	}
+	return ciph
+}
+
+// Chacha20IETF returns a Chacha20IETF cipher.
+func Chacha20IETF(key []byte) (Cipher, error) {
+	if len(key) != chacha.KeySize {
+		return nil, KeySizeError(chacha.KeySize)
+	}
+	return chacha20ietfkey(key), nil
+}
+
+// xchacha20
+type xchacha20key []byte
+
+func (k xchacha20key) IVSize() int                       { return chacha.XNonceSize }
+func (k xchacha20key) Decrypter(iv []byte) cipher.Stream { return k.Encrypter(iv) }
+func (k xchacha20key) Encrypter(iv []byte) cipher.Stream {
+	ciph, err := chacha20.NewCipher(iv, k)
+	if err != nil {
+		panic(err) // should never happen
+	}
+	return ciph
+}
+
+// Xchacha20 returns a Xchacha20 cipher.
+func Xchacha20(key []byte) (Cipher, error) {
+	if len(key) != chacha.KeySize {
+		return nil, KeySizeError(chacha.KeySize)
+	}
+	return xchacha20key(key), nil
+}
+
+// chacah20
+type chacha20key []byte
+
+func (k chacha20key) IVSize() int                       { return chacha.NonceSize }
+func (k chacha20key) Decrypter(iv []byte) cipher.Stream { return k.Encrypter(iv) }
+func (k chacha20key) Encrypter(iv []byte) cipher.Stream {
+	ciph, err := chacha20.NewCipher(iv, k)
+	if err != nil {
+		panic(err) // should never happen
+	}
+	return ciph
+}
+
+// ChaCha20 returns a ChaCha20 cipher.
+func ChaCha20(key []byte) (Cipher, error) {
+	if len(key) != chacha.KeySize {
+		return nil, KeySizeError(chacha.KeySize)
+	}
+	return chacha20key(key), nil
+}
+
+// rc4md5
+type rc4Md5Key []byte
+
+func (k rc4Md5Key) IVSize() int                       { return 16 }
+func (k rc4Md5Key) Decrypter(iv []byte) cipher.Stream { return k.Encrypter(iv) }
+func (k rc4Md5Key) Encrypter(iv []byte) cipher.Stream {
+	h := md5.New()
+	h.Write([]byte(k))
+	h.Write(iv)
+	rc4key := h.Sum(nil)
+	ciph, err := rc4.NewCipher(rc4key)
+	if err != nil {
+		panic(err) // should never happen
+	}
+	return ciph
+}
+
+// RC4MD5 returns a RC4MD5 cipher.
+func RC4MD5(key []byte) (Cipher, error) {
+	return rc4Md5Key(key), nil
+}

proxy/ss/cipher/shadowstream/conn.go

@@ -0,0 +1,62 @@
+package shadowstream
+
+import (
+	"crypto/rand"
+	"io"
+	"net"
+)
+
+type conn struct {
+	net.Conn
+	Cipher
+	r *reader
+	w *writer
+}
+
+// NewConn wraps a stream-oriented net.Conn with stream cipher encryption/decryption.
+func NewConn(c net.Conn, ciph Cipher) net.Conn {
+	return &conn{Conn: c, Cipher: ciph}
+}
+
+func (c *conn) initReader() error {
+	if c.r == nil {
+		iv := make([]byte, c.IVSize())
+		if _, err := io.ReadFull(c.Conn, iv); err != nil {
+			return err
+		}
+		c.r = &reader{Reader: c.Conn, Stream: c.Decrypter(iv)}
+	}
+	return nil
+}
+
+func (c *conn) Read(b []byte) (int, error) {
+	if c.r == nil {
+		if err := c.initReader(); err != nil {
+			return 0, err
+		}
+	}
+	return c.r.Read(b)
+}
+
+func (c *conn) initWriter() error {
+	if c.w == nil {
+		iv := make([]byte, c.IVSize())
+		if _, err := io.ReadFull(rand.Reader, iv); err != nil {
+			return err
+		}
+		if _, err := c.Conn.Write(iv); err != nil {
+			return err
+		}
+		c.w = &writer{Writer: c.Conn, Stream: c.Encrypter(iv)}
+	}
+	return nil
+}
+
+func (c *conn) Write(b []byte) (int, error) {
+	if c.w == nil {
+		if err := c.initWriter(); err != nil {
+			return 0, err
+		}
+	}
+	return c.w.Write(b)
+}

proxy/ss/cipher/shadowstream/packet.go

@@ -0,0 +1,80 @@
+package shadowstream
+
+import (
+	"crypto/rand"
+	"errors"
+	"io"
+	"net"
+	"sync"
+)
+
+// ErrShortPacket means the packet is too short to be a valid encrypted packet.
+var ErrShortPacket = errors.New("short packet")
+
+// Pack encrypts plaintext using stream cipher s and a random IV.
+// Returns a slice of dst containing random IV and ciphertext.
+// Ensure len(dst) >= s.IVSize() + len(plaintext).
+func Pack(dst, plaintext []byte, s Cipher) ([]byte, error) {
+	if len(dst) < s.IVSize()+len(plaintext) {
+		return nil, io.ErrShortBuffer
+	}
+	iv := dst[:s.IVSize()]
+	_, err := io.ReadFull(rand.Reader, iv)
+	if err != nil {
+		return nil, err
+	}
+
+	s.Encrypter(iv).XORKeyStream(dst[len(iv):], plaintext)
+	return dst[:len(iv)+len(plaintext)], nil
+}
+
+// Unpack decrypts pkt using stream cipher s.
+// Returns a slice of dst containing decrypted plaintext.
+func Unpack(dst, pkt []byte, s Cipher) ([]byte, error) {
+	if len(pkt) < s.IVSize() {
+		return nil, ErrShortPacket
+	}
+
+	if len(dst) < len(pkt)-s.IVSize() {
+		return nil, io.ErrShortBuffer
+	}
+	iv := pkt[:s.IVSize()]
+	s.Decrypter(iv).XORKeyStream(dst, pkt[len(iv):])
+	return dst[:len(pkt)-len(iv)], nil
+}
+
+type packetConn struct {
+	net.PacketConn
+	Cipher
+	buf        []byte
+	sync.Mutex // write lock
+}
+
+// NewPacketConn wraps a net.PacketConn with stream cipher encryption/decryption.
+func NewPacketConn(c net.PacketConn, ciph Cipher) net.PacketConn {
+	return &packetConn{PacketConn: c, Cipher: ciph, buf: make([]byte, 64*1024)}
+}
+
+func (c *packetConn) WriteTo(b []byte, addr net.Addr) (int, error) {
+	c.Lock()
+	defer c.Unlock()
+	buf, err := Pack(c.buf, b, c.Cipher)
+	if err != nil {
+		return 0, err
+	}
+	_, err = c.PacketConn.WriteTo(buf, addr)
+	return len(b), err
+}
+
+func (c *packetConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, addr, err := c.PacketConn.ReadFrom(b)
+	if err != nil {
+		return n, addr, err
+	}
+	bb, err := Unpack(b[c.IVSize():], b[:n], c.Cipher)
+	if err != nil {
+		return n, addr, err
+	}
+	copy(b, bb)
+	return len(bb), addr, err
+}

proxy/ss/cipher/shadowstream/stream.go

@@ -0,0 +1,55 @@
+package shadowstream
+
+import (
+	"crypto/cipher"
+	"io"
+
+	"github.com/nadoo/glider/pkg/pool"
+)
+
+const bufSize = 32 * 1024
+
+type writer struct {
+	io.Writer
+	cipher.Stream
+}
+
+// NewWriter wraps an io.Writer with stream cipher encryption.
+func NewWriter(w io.Writer, s cipher.Stream) io.Writer {
+	return &writer{Writer: w, Stream: s}
+}
+
+func (w *writer) Write(p []byte) (n int, err error) {
+	buf := pool.GetBuffer(bufSize)
+	defer pool.PutBuffer(buf)
+
+	for nw := 0; n < len(p) && err == nil; n += nw {
+		end := n + len(buf)
+		if end > len(p) {
+			end = len(p)
+		}
+		w.XORKeyStream(buf, p[n:end])
+		nw, err = w.Writer.Write(buf[:end-n])
+	}
+	return
+}
+
+type reader struct {
+	io.Reader
+	cipher.Stream
+}
+
+// NewReader wraps an io.Reader with stream cipher decryption.
+func NewReader(r io.Reader, s cipher.Stream) io.Reader {
+	return &reader{Reader: r, Stream: s}
+}
+
+func (r *reader) Read(p []byte) (int, error) {
+	n, err := r.Reader.Read(p)
+	if err != nil {
+		return 0, err
+	}
+	p = p[:n]
+	r.XORKeyStream(p, p)
+	return n, nil
+}