redir: fix test error

fix https://github.com/nadoo/glider/issues/354

.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

@@ -1,35 +1,103 @@
 name: Build
-on: [push]
+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:
-
-  test:
-    name: Test
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Set up Go
-        uses: actions/setup-go@v1
-        with:
-          go-version: 1.15.x
-      - name: Go Env
-        run: go env
-      - name: Test
-        run: go test -v .
-
   build:
     name: Build
     runs-on: ubuntu-latest
-    needs: [test]
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
-      - name: Set up Go
-        uses: actions/setup-go@v1
+        uses: actions/checkout@v4
         with:
-          go-version: 1.15.x
-      - name: Go Env
-        run: go env
+          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
-        run: go build -v .
+        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/release.yml

@@ -1,28 +0,0 @@
-name: Release
-on:
-  push:
-    tags:
-      - v*
-
-jobs:
-  release:
-    name: Release on GitHub
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-      - name: Set up Go
-        uses: actions/setup-go@v1
-        with:
-          go-version: 1.15.x
-      - name: Go Env
-        run: go env
-      - name: Run GoReleaser
-        uses: goreleaser/goreleaser-action@v2
-        with:
-          version: latest
-          args: release --rm-dist
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.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

@@ -17,11 +17,14 @@
 # custom
 .idea
 .vscode
+.zed
+.DS_Store
 
 # dev test only
 /dev/
 dev*.go
 
+*_test.go
 
 dist
 

.goreleaser.yml

@@ -1,23 +1,9 @@
-# Make sure to check the documentation at http://goreleaser.com
-
-# release:
-# git tag -a v0.1.0 -m "v0.1.0"
-# git push origin v0.1.0
-# goreleaser release --skip-publish --rm-dist
-
-# #git tag -d v0.1.0
-# #git push origin --delete tag v0.1.0
-
-# snapshot:
-# goreleaser --snapshot --rm-dist
-
-# https://goreleaser.com/customization/
+version: 2
 
 before:
   hooks:
     - go mod tidy
 
-# https://goreleaser.com/build/
 builds:
   - id: default
     env:
@@ -26,6 +12,7 @@ builds:
       - windows
       - linux
       - darwin
+      - freebsd
     goarch:
       - 386
       - amd64
@@ -35,6 +22,10 @@ builds:
       - mipsle
       - mips64
       - mips64le
+      - riscv64
+    goamd64:
+      - v1
+      - v3
     goarm:
       - 6
       - 7
@@ -42,31 +33,64 @@ builds:
       - hardfloat
       - softfloat
 
-    ignore:
-      - goos: darwin
-        goarch: 386
-
-# https://goreleaser.com/archive/
 archives:
   - id: default
     builds:
       - default
-    name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}{{ if .Mips }}_{{ .Mips }}{{ end }}"
     wrap_in_directory: true
-    format: tar.gz
+    formats: tar.gz
     format_overrides:
       - goos: windows
-        format: zip
+        formats: zip
     files:
       - LICENSE
       - README.md
       - config/**/*
       - systemd/*
 
-# https://goreleaser.com/snapshots/
 snapshot:
-  name_template: "dev@{{.ShortCommit}}"
+  version_template: '{{ incpatch .Version }}-dev-{{.ShortCommit}}'
 
-# https://goreleaser.com/checksum/
 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

Dockerfile

@@ -1,11 +1,14 @@
-# build stage
-FROM golang:alpine AS build-env
-RUN apk --no-cache add build-base git gcc
+# Build Stage
+FROM golang:1.24-alpine AS build-env
 ADD . /src
-RUN cd /src && go build -o glider
+RUN apk --no-cache add git \
+    && cd /src && go build -v -ldflags "-s -w"
 
-# final stage
+# Final Stage
 FROM alpine
-WORKDIR /app
 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

@@ -1,8 +1,10 @@
 # [glider](https://github.com/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 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/workflow/status/nadoo/glider/Build?style=flat-square)](https://github.com/nadoo/glider/actions)
+[![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/dhcp server with ipset management features(like dnsmasq).
 
@@ -37,302 +39,393 @@ we can set up local listeners as proxy servers, and forward requests to internet
 - Periodical availability checking for forwarders
 - Send requests from specific local ip/interface
 - Services: 
-  - dhcpd: a simple dhcp server that can detect existing dhcp server and avoid conflicts
+  - dhcpd: a simple dhcp server that can run in failover mode
 
 ## Protocols
+
 <details>
 <summary>click to see details</summary>
 
-|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
-|TLS          |√| |√| |transport client & server
-|KCP          | |√|√| |transport client & server
-|Unix         |√| |√| |transport client & server
-|Websocket    |√| |√| |transport client & server
-|Simple-Obfs  | | |√| |transport client only
-|TCPTun       |√| | | |transport server only
-|UDPTun       | |√| | |transport server only
-|Redir        |√| | | |linux only
-|Redir6       |√| | | |linux only(ipv6)
-|Reject       | | |√|√|reject all requests
+|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
 
 </details>
 
 ## Install
 
-Download:
-- [https://github.com/nadoo/glider/releases](https://github.com/nadoo/glider/releases)
-
-ArchLinux:
-```bash
-sudo pacman -S glider
-```
+- 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 -h
+glider -verbose -listen :8443
+# docker run --rm -it nadoo/glider -verbose -listen :8443
 ```
+
+#### Help
+
 <details>
-<summary>click to see details</summary>
+<summary><code>glider -help</code></summary>
 
 ```bash
-glider 0.12.2 usage:
+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
+        check disabled fowarders only
   -checkinterval int
-    	fowarder check interval(seconds) (default 30)
+        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)
+        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
-  -checkwebsite string
-    	fowarder check HTTP(NOT HTTPS) website address, format: HOST[:PORT], default port: 80 (default "www.apple.com")
+        fowarder check tolerance(ms), switch only when new_latency < old_latency - tolerance, only used in lha mode
   -config string
-    	config file path
+        config file path
   -dialtimeout int
-    	dial timeout(seconds) (default 3)
+        dial timeout(seconds) (default 3)
   -dns string
-    	local dns server listen address
+        local dns server listen address
   -dnsalwaystcp
-    	always use tcp to query upstream dns servers no matter there is a forwarder or not
+        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
-    	size of CACHE (default 4096)
+        max number of dns response in CACHE (default 4096)
   -dnsmaxttl int
-    	maximum TTL value for entries in the CACHE(seconds) (default 1800)
+        maximum TTL value for entries in the CACHE(seconds) (default 1800)
   -dnsminttl int
-    	minimum TTL value for entries in the CACHE(seconds)
+        minimum TTL value for entries in the CACHE(seconds)
+  -dnsnoaaaa
+        disable AAAA query
   -dnsrecord value
-    	custom dns record, format: domain/ip
+        custom dns record, format: domain/ip
   -dnsserver value
-    	remote dns server address
+        remote dns server address
   -dnstimeout int
-    	timeout value used in multiple dnsservers switch(seconds) (default 3)
+        timeout value used in multiple dnsservers switch(seconds) (default 3)
+  -example
+        show usage examples
   -forward value
-    	forward url, format: SCHEME://[USER|METHOD:PASSWORD@][HOST]:PORT?PARAMS[,SCHEME://[USER|METHOD:PASSWORD@][HOST]:PORT?PARAMS]
+        forward url, see the URL section below
   -include value
-    	include file
+        include file
   -interface string
-    	source ip or source interface
+        source ip or source interface
   -listen value
-    	listen url, format: SCHEME://[USER|METHOD:PASSWORD@][HOST]:PORT?PARAMS
+        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)
+        max failures to change forwarder status to disabled (default 3)
   -relaytimeout int
-    	relay timeout(seconds)
+        relay timeout(seconds)
   -rulefile value
-    	rule file path
+        rule file path
   -rules-dir string
-    	rule file folder
+        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]
+        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
+        verbose mode
 
-Available schemes:
-  listen: mixed ss socks5 http vless trojan trojanc redir redir6 tcptun udptun tls ws unix kcp
-  forward: reject ss socks4 socks5 http ssr ssh vless vmess trojan trojanc tls ws unix kcp simple-obfs
+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 : 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:
-  socks://[user:pass@]host:port
+  socks5://[user:pass@]host:port
 
+--
 SS scheme:
   ss://method:pass@host:port
+  
+  Available methods for ss:
+    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 methods for ss:
-  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
+--
+SSH scheme:
+  ssh://user[:pass]@host:port[?key=keypath&timeout=SECONDS]
+    timeout: timeout of ssh handshake and channel operation, default: 5
 
+--
 SSR scheme:
   ssr://method:pass@host:port?protocol=xxx&protocol_param=yyy&obfs=zzz&obfs_param=xyz
 
-SSH scheme:
-  ssh://user[:pass]@host:port[?key=keypath]
-
-VMess scheme:
-  vmess://[security:]uuid@host:port?alterID=num
-
-VLESS scheme:
-  vless://uuid@host:port[?fallback=127.0.0.1:80]
-
-Trojan client scheme:
-  trojan://pass@host:port[?serverName=SERVERNAME][&skipVerify=true]
-  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)
-
-Available securities for vmess:
-  none, aes-128-gcm, chacha20-poly1305
-
+--
 TLS client scheme:
-  tls://host:port[?serverName=SERVERNAME][&skipVerify=true]
-
+  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
-
+  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@
 
-Websocket client scheme:
-  ws://host:port[/path][?host=HOST]
+--
+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@]
-  ws://host:port[/path][?host=HOST],vmess://[security:]uuid@?alterID=num
-
+  
 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
 
-Unix domain socket scheme:
-  unix://path
+--
+VM socket scheme(linux only):
+  vsock://[CID]:port
 
-KCP scheme:
-  kcp://CRYPT:KEY@host:port[?dataShards=NUM&parityShards=NUM]
-
-Available crypt types for KCP:
-  none, sm4, tea, xor, aes, aes-128, aes-192, blowfish, twofish, cast5, 3des, xtea, salsa20
-
-Simple-Obfs scheme:
-  simple-obfs://host:port[?type=TYPE&host=HOST&uri=URI&ua=UA]
-
-Available types for simple-obfs:
-  http, tls
-
-DNS forwarding server:
-  dns=:53
-  dnsserver=8.8.8.8:53
-  dnsserver=1.1.1.1:53
-  dnsrecord=www.example.com/1.2.3.4
-  dnsrecord=www.example.com/2606:2800:220:1:248:1893:25c8:1946
-
-Available forward strategies:
-  rr: Round Robin mode
-  ha: High Availability mode
-  lha: Latency based High Availability mode
-  dh: Destination Hashing mode
-
-Forwarder option scheme: FORWARD_URL#OPTIONS
-  priority: set the priority of that forwarder, default:0
-  interface: set local interface or ip address used to connect remote server
-  -
-  Examples:
-    socks5://1.1.1.1:1080#priority=100
-    vmess://[security:]uuid@host:port?alterID=num#priority=200
-    vmess://[security:]uuid@host:port?alterID=num#priority=200&interface=192.168.1.99
-    vmess://[security:]uuid@host:port?alterID=num#priority=200&interface=eth0
-
-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...
-
-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 ss://AEAD_CHACHA20_POLY1305:pass@:8443 -verbose
-    -listen on 0.0.0.0:8443 as a ss server.
-
-  ./glider -listen socks5://user1:pass1@:1080 -verbose
-    -listen on :1080 as a socks5 proxy server, enable authentication.
-
-  ./glider -listen tls://:443?cert=crtFilePath&key=keyFilePath,http:// -verbose
-    -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 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 redir://:1081 -forward "ssr://method:pass@1.1.1.1:8444?protocol=a&protocol_param=b&obfs=c&obfs_param=d"
-    -listen on :1081 as a transparent redirect server, forward all requests via remote ssr server.
-
-  ./glider -listen redir://:1081 -forward "tls://abc.com:443,vmess://security:uuid@?alterID=10"
-    -listen on :1081 as a transparent redirect server, forward all requests via remote tls+vmess server.
-
-  ./glider -listen redir://:1081 -forward "ws://1.1.1.1:80,vmess://security:uuid@?alterID=10"
-    -listen on :1081 as a transparent redirect server, forward all requests via remote ws+vmess server.
-
-  ./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 udptun://:53=8.8.8.8:53 -forward ss://method:pass@1.1.1.1:8443
-    -listen on :53 and forward all udp requests to 8.8.8.8:53 via remote ss server.
-
-  ./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 redir://:1081 -dns=:53 -dnsserver=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 round robin mode.
-
-  ./glider -verbose -dns=:53 -dnsserver=8.8.8.8:53 -dnsrecord=www.example.com/1.2.3.4
-    -listen on :53 as dns server, forward dns requests to 8.8.8.8:53, return 1.2.3.4 when resolving www.example.com.
-
-Services:
-  dhcpd: service=dhcpd,INTERFACE,START_IP,END_IP
-    e.g.,service=dhcpd,eth1,192.168.50.100,192.168.50.199
+  if you want to listen on any address, just set CID to 4294967295.
 ```
 
 </details>
 
-run:
+#### Examples
+
+<details>
+<summary><code>glider -example</code></summary>
+
 ```bash
-glider -verbose -listen :8443 -forward SCHEME://HOST:PORT
-```
-```bash
-glider -config CONFIGPATH
-```
-```bash
-glider -config CONFIGPATH -listen :8080 -verbose
+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.
 ```
 
+</details>
+
+
 ## Config
 
+```bash
+glider -config CONFIG_PATH
+```
+
 - [ConfigFile](config)
   - [glider.conf.example](config/glider.conf.example)
   - [office.rule.example](config/rules.d/office.rule.example)
@@ -342,13 +435,40 @@ glider -config CONFIGPATH -listen :8080 -verbose
 
 ## Service
 
-- dhcpd: 
-  - service=dhcpd,INTERFACE,START_IP,END_IP
-  - e.g., service=dhcpd,eth1,192.168.50.100,192.168.50.199
+- 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 Service
+## 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>
 
-- systemd: [https://github.com/nadoo/glider/blob/master/systemd/](https://github.com/nadoo/glider/blob/master/systemd/)
 
 ## Customize Build
 
@@ -357,7 +477,7 @@ glider -config CONFIGPATH -listen :8080 -verbose
 
 1. Clone the source code:
   ```bash
-  git clone https://github.com/nadoo/glider
+  git clone https://github.com/nadoo/glider && cd glider
   ```
 2. Customize features:
 
@@ -366,12 +486,12 @@ glider -config CONFIGPATH -listen :8080 -verbose
   // _ "github.com/nadoo/glider/proxy/kcp"
   ```
 
-3. Build it(requires **Go 1.15+** )
+3. Build it:
   ```bash
-  cd glider && go build -v -i -ldflags "-s -w"
+  go build -v -ldflags "-s -w"
   ```
 
-  </details>
+</details>
 
 ## Proxy & Protocol Chains
 <details><summary>In glider, you can easily chain several proxy servers or protocols together (click to see details)</summary>
@@ -406,11 +526,17 @@ glider -config CONFIGPATH -listen :8080 -verbose
   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
 
 - [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://www.archlinux.org/packages/community/x86_64/glider): a great linux distribution with glider pre-built package.
+- [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`

config.go

@@ -8,7 +8,8 @@ import (
 	"github.com/nadoo/conflag"
 
 	"github.com/nadoo/glider/dns"
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/proxy"
 	"github.com/nadoo/glider/rule"
 )
 
@@ -16,12 +17,15 @@ var flag = conflag.New()
 
 // Config is global config struct.
 type Config struct {
-	Verbose bool
+	Verbose    bool
+	LogFlags   int
+	TCPBufSize int
+	UDPBufSize int
 
 	Listens []string
 
-	Forwards       []string
-	StrategyConfig rule.StrategyConfig
+	Forwards []string
+	Strategy rule.Strategy
 
 	RuleFiles []string
 	RulesDir  string
@@ -39,20 +43,35 @@ func parseConfig() *Config {
 
 	flag.SetOutput(os.Stdout)
 
-	flag.BoolVar(&conf.Verbose, "verbose", false, "verbose mode")
-	flag.StringSliceUniqVar(&conf.Listens, "listen", nil, "listen url, format: SCHEME://[USER|METHOD:PASSWORD@][HOST]:PORT?PARAMS")
+	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.StringSliceUniqVar(&conf.Forwards, "forward", nil, "forward url, format: SCHEME://[USER|METHOD:PASSWORD@][HOST]:PORT?PARAMS[,SCHEME://[USER|METHOD:PASSWORD@][HOST]:PORT?PARAMS]")
-	flag.StringVar(&conf.StrategyConfig.Strategy, "strategy", "rr", "forward strategy, default: rr")
-	flag.StringVar(&conf.StrategyConfig.CheckWebSite, "checkwebsite", "www.apple.com", "fowarder check HTTP(NOT HTTPS) website address, format: HOST[:PORT], default port: 80")
-	flag.IntVar(&conf.StrategyConfig.CheckInterval, "checkinterval", 30, "fowarder check interval(seconds)")
-	flag.IntVar(&conf.StrategyConfig.CheckTimeout, "checktimeout", 10, "fowarder check timeout(seconds)")
-	flag.IntVar(&conf.StrategyConfig.CheckTolerance, "checktolerance", 0, "fowarder check tolerance(ms), switch only when new_latency < old_latency - tolerance, only used in lha mode")
-	flag.BoolVar(&conf.StrategyConfig.CheckDisabledOnly, "checkdisabledonly", false, "check disabled fowarders only")
-	flag.IntVar(&conf.StrategyConfig.MaxFailures, "maxfailures", 3, "max failures to change forwarder status to disabled")
-	flag.IntVar(&conf.StrategyConfig.DialTimeout, "dialtimeout", 3, "dial timeout(seconds)")
-	flag.IntVar(&conf.StrategyConfig.RelayTimeout, "relaytimeout", 0, "relay timeout(seconds)")
-	flag.StringVar(&conf.StrategyConfig.IntFace, "interface", "", "source ip or source interface")
+	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")
@@ -64,31 +83,55 @@ func parseConfig() *Config {
 	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, "size of CACHE")
+	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
-	err := flag.Parse()
-	if err != nil {
+	if err := flag.Parse(); err != nil {
 		// flag.Usage()
 		fmt.Fprintf(os.Stderr, "ERROR: %s\n", err)
 		os.Exit(-1)
 	}
 
-	// setup a log func
-	if conf.Verbose {
-		log.F = log.Debugf
+	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) {
@@ -117,221 +160,95 @@ func parseConfig() *Config {
 			conf.rules = append(conf.rules, rule)
 		}
 	}
-
-	return conf
 }
 
 func usage() {
-	app := os.Args[0]
-	w := flag.Output()
-
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "%s %s usage:\n", app, version)
+	fmt.Fprint(flag.Output(), usage1)
 	flag.PrintDefaults()
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Available schemes:\n")
-	fmt.Fprintf(w, "  listen: mixed ss socks5 http vless trojan trojanc redir redir6 tcptun udptun tls ws unix kcp\n")
-	fmt.Fprintf(w, "  forward: reject ss socks4 socks5 http ssr ssh vless vmess trojan trojanc tls ws unix kcp simple-obfs\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Socks5 scheme:\n")
-	fmt.Fprintf(w, "  socks://[user:pass@]host:port\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "SS scheme:\n")
-	fmt.Fprintf(w, "  ss://method:pass@host:port\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Available methods for ss:\n")
-	fmt.Fprintf(w, "  AEAD Ciphers:\n")
-	fmt.Fprintf(w, "    AEAD_AES_128_GCM AEAD_AES_192_GCM AEAD_AES_256_GCM AEAD_CHACHA20_POLY1305 AEAD_XCHACHA20_POLY1305\n")
-	fmt.Fprintf(w, "  Stream Ciphers:\n")
-	fmt.Fprintf(w, "    AES-128-CFB AES-128-CTR AES-192-CFB AES-192-CTR AES-256-CFB AES-256-CTR CHACHA20-IETF XCHACHA20 CHACHA20 RC4-MD5\n")
-	fmt.Fprintf(w, "  Alias:\n")
-	fmt.Fprintf(w, "    chacha20-ietf-poly1305 = AEAD_CHACHA20_POLY1305, xchacha20-ietf-poly1305 = AEAD_XCHACHA20_POLY1305\n")
-	fmt.Fprintf(w, "  Plain: NONE\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "SSR scheme:\n")
-	fmt.Fprintf(w, "  ssr://method:pass@host:port?protocol=xxx&protocol_param=yyy&obfs=zzz&obfs_param=xyz\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "SSH scheme:\n")
-	fmt.Fprintf(w, "  ssh://user[:pass]@host:port[?key=keypath]\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "VMess scheme:\n")
-	fmt.Fprintf(w, "  vmess://[security:]uuid@host:port?alterID=num\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "VLESS scheme:\n")
-	fmt.Fprintf(w, "  vless://uuid@host:port[?fallback=127.0.0.1:80]\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Trojan client scheme:\n")
-	fmt.Fprintf(w, "  trojan://pass@host:port[?serverName=SERVERNAME][&skipVerify=true]\n")
-	fmt.Fprintf(w, "  trojanc://pass@host:port     (cleartext, without TLS)\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Trojan server scheme:\n")
-	fmt.Fprintf(w, "  trojan://pass@host:port?cert=PATH&key=PATH[&fallback=127.0.0.1]\n")
-	fmt.Fprintf(w, "  trojanc://pass@host:port[?fallback=127.0.0.1]     (cleartext, without TLS)\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Available securities for vmess:\n")
-	fmt.Fprintf(w, "  none, aes-128-gcm, chacha20-poly1305\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "TLS client scheme:\n")
-	fmt.Fprintf(w, "  tls://host:port[?serverName=SERVERNAME][&skipVerify=true]\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Proxy over tls client:\n")
-	fmt.Fprintf(w, "  tls://host:port[?skipVerify=true][&serverName=SERVERNAME],scheme://\n")
-	fmt.Fprintf(w, "  tls://host:port[?skipVerify=true],http://[user:pass@]\n")
-	fmt.Fprintf(w, "  tls://host:port[?skipVerify=true],socks5://[user:pass@]\n")
-	fmt.Fprintf(w, "  tls://host:port[?skipVerify=true],vmess://[security:]uuid@?alterID=num\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "TLS server scheme:\n")
-	fmt.Fprintf(w, "  tls://host:port?cert=PATH&key=PATH\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Proxy over tls server:\n")
-	fmt.Fprintf(w, "  tls://host:port?cert=PATH&key=PATH,scheme://\n")
-	fmt.Fprintf(w, "  tls://host:port?cert=PATH&key=PATH,http://\n")
-	fmt.Fprintf(w, "  tls://host:port?cert=PATH&key=PATH,socks5://\n")
-	fmt.Fprintf(w, "  tls://host:port?cert=PATH&key=PATH,ss://method:pass@\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Websocket client scheme:\n")
-	fmt.Fprintf(w, "  ws://host:port[/path][?host=HOST]\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Websocket server scheme:\n")
-	fmt.Fprintf(w, "  ws://:port[/path][?host=HOST]\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Websocket with a specified proxy protocol:\n")
-	fmt.Fprintf(w, "  ws://host:port[/path][?host=HOST],scheme://\n")
-	fmt.Fprintf(w, "  ws://host:port[/path][?host=HOST],http://[user:pass@]\n")
-	fmt.Fprintf(w, "  ws://host:port[/path][?host=HOST],socks5://[user:pass@]\n")
-	fmt.Fprintf(w, "  ws://host:port[/path][?host=HOST],vmess://[security:]uuid@?alterID=num\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "TLS and Websocket with a specified proxy protocol:\n")
-	fmt.Fprintf(w, "  tls://host:port[?skipVerify=true][&serverName=SERVERNAME],ws://[@/path[?host=HOST]],scheme://\n")
-	fmt.Fprintf(w, "  tls://host:port[?skipVerify=true],ws://[@/path[?host=HOST]],http://[user:pass@]\n")
-	fmt.Fprintf(w, "  tls://host:port[?skipVerify=true],ws://[@/path[?host=HOST]],socks5://[user:pass@]\n")
-	fmt.Fprintf(w, "  tls://host:port[?skipVerify=true],ws://[@/path[?host=HOST]],vmess://[security:]uuid@?alterID=num\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Unix domain socket scheme:\n")
-	fmt.Fprintf(w, "  unix://path\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "KCP scheme:\n")
-	fmt.Fprintf(w, "  kcp://CRYPT:KEY@host:port[?dataShards=NUM&parityShards=NUM]\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Available crypt types for KCP:\n")
-	fmt.Fprintf(w, "  none, sm4, tea, xor, aes, aes-128, aes-192, blowfish, twofish, cast5, 3des, xtea, salsa20\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Simple-Obfs scheme:\n")
-	fmt.Fprintf(w, "  simple-obfs://host:port[?type=TYPE&host=HOST&uri=URI&ua=UA]\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Available types for simple-obfs:\n")
-	fmt.Fprintf(w, "  http, tls\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "DNS forwarding server:\n")
-	fmt.Fprintf(w, "  dns=:53\n")
-	fmt.Fprintf(w, "  dnsserver=8.8.8.8:53\n")
-	fmt.Fprintf(w, "  dnsserver=1.1.1.1:53\n")
-	fmt.Fprintf(w, "  dnsrecord=www.example.com/1.2.3.4\n")
-	fmt.Fprintf(w, "  dnsrecord=www.example.com/2606:2800:220:1:248:1893:25c8:1946\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Available forward strategies:\n")
-	fmt.Fprintf(w, "  rr: Round Robin mode\n")
-	fmt.Fprintf(w, "  ha: High Availability mode\n")
-	fmt.Fprintf(w, "  lha: Latency based High Availability mode\n")
-	fmt.Fprintf(w, "  dh: Destination Hashing mode\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Forwarder option scheme: FORWARD_URL#OPTIONS\n")
-	fmt.Fprintf(w, "  priority: set the priority of that forwarder, default:0\n")
-	fmt.Fprintf(w, "  interface: set local interface or ip address used to connect remote server\n")
-	fmt.Fprintf(w, "  -\n")
-	fmt.Fprintf(w, "  Examples:\n")
-	fmt.Fprintf(w, "    socks5://1.1.1.1:1080#priority=100\n")
-	fmt.Fprintf(w, "    vmess://[security:]uuid@host:port?alterID=num#priority=200\n")
-	fmt.Fprintf(w, "    vmess://[security:]uuid@host:port?alterID=num#priority=200&interface=192.168.1.99\n")
-	fmt.Fprintf(w, "    vmess://[security:]uuid@host:port?alterID=num#priority=200&interface=eth0\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Config file format(see `"+app+".conf.example` as an example):\n")
-	fmt.Fprintf(w, "  # COMMENT LINE\n")
-	fmt.Fprintf(w, "  KEY=VALUE\n")
-	fmt.Fprintf(w, "  KEY=VALUE\n")
-	fmt.Fprintf(w, "  # KEY equals to command line flag name: listen forward strategy...\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Examples:\n")
-	fmt.Fprintf(w, "  "+app+" -config glider.conf\n")
-	fmt.Fprintf(w, "    -run glider with specified config file.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen :8443 -verbose\n")
-	fmt.Fprintf(w, "    -listen on :8443, serve as http/socks5 proxy on the same port, in verbose mode.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen ss://AEAD_CHACHA20_POLY1305:pass@:8443 -verbose\n")
-	fmt.Fprintf(w, "    -listen on 0.0.0.0:8443 as a ss server.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen socks5://user1:pass1@:1080 -verbose\n")
-	fmt.Fprintf(w, "    -listen on :1080 as a socks5 proxy server, enable authentication.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen tls://:443?cert=crtFilePath&key=keyFilePath,http:// -verbose\n")
-	fmt.Fprintf(w, "    -listen on :443 as a https(http over tls) proxy server.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen http://:8080 -forward socks5://127.0.0.1:1080\n")
-	fmt.Fprintf(w, "    -listen on :8080 as a http proxy server, forward all requests via socks5 server.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen redir://:1081 -forward ss://method:pass@1.1.1.1:8443\n")
-	fmt.Fprintf(w, "    -listen on :1081 as a transparent redirect server, forward all requests via remote ss server.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen redir://:1081 -forward \"ssr://method:pass@1.1.1.1:8444?protocol=a&protocol_param=b&obfs=c&obfs_param=d\"\n")
-	fmt.Fprintf(w, "    -listen on :1081 as a transparent redirect server, forward all requests via remote ssr server.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen redir://:1081 -forward \"tls://abc.com:443,vmess://security:uuid@?alterID=10\"\n")
-	fmt.Fprintf(w, "    -listen on :1081 as a transparent redirect server, forward all requests via remote tls+vmess server.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen redir://:1081 -forward \"ws://1.1.1.1:80,vmess://security:uuid@?alterID=10\"\n")
-	fmt.Fprintf(w, "    -listen on :1081 as a transparent redirect server, forward all requests via remote ws+vmess server.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen tcptun://:80=2.2.2.2:80 -forward ss://method:pass@1.1.1.1:8443\n")
-	fmt.Fprintf(w, "    -listen on :80 and forward all requests to 2.2.2.2:80 via remote ss server.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen udptun://:53=8.8.8.8:53 -forward ss://method:pass@1.1.1.1:8443\n")
-	fmt.Fprintf(w, "    -listen on :53 and forward all udp requests to 8.8.8.8:53 via remote ss server.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen socks5://:1080 -listen http://:8080 -forward ss://method:pass@1.1.1.1:8443\n")
-	fmt.Fprintf(w, "    -listen on :1080 as socks5 server, :8080 as http proxy server, forward all requests via remote ss server.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen redir://:1081 -dns=:53 -dnsserver=8.8.8.8:53 -forward ss://method:pass@server1:port1,ss://method:pass@server2:port2\n")
-	fmt.Fprintf(w, "    -listen on :1081 as transparent redirect server, :53 as dns server, use forward chain: server1 -> server2.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -listen socks5://:1080 -forward ss://method:pass@server1:port1 -forward ss://method:pass@server2:port2 -strategy rr\n")
-	fmt.Fprintf(w, "    -listen on :1080 as socks5 server, forward requests via server1 and server2 in round robin mode.\n")
-	fmt.Fprintf(w, "\n")
-	fmt.Fprintf(w, "  "+app+" -verbose -dns=:53 -dnsserver=8.8.8.8:53 -dnsrecord=www.example.com/1.2.3.4\n")
-	fmt.Fprintf(w, "    -listen on :53 as dns server, forward dns requests to 8.8.8.8:53, return 1.2.3.4 when resolving www.example.com.\n")
-	fmt.Fprintf(w, "\n")
-
-	fmt.Fprintf(w, "Services:\n")
-	fmt.Fprintf(w, "  dhcpd: service=dhcpd,INTERFACE,START_IP,END_IP\n")
-	fmt.Fprintf(w, "    e.g.,service=dhcpd,eth1,192.168.50.100,192.168.50.199\n")
-	fmt.Fprintf(w, "\n")
+	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
 
@@ -23,13 +31,11 @@ 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 interval
 checkinterval=30
@@ -50,8 +56,8 @@ rules-dir=rules.d
 #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**:
@@ -61,7 +67,7 @@ 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
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 checkinterval=30
 
 # DNS SERVER for domains in this rule file

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 interval(seconds)
 checkinterval=30

config/examples/5.rule_default_direct/office.rule

@@ -8,7 +8,8 @@ forward=http://1.1.1.1:8080
 # High Availability mode: ha
 strategy=rr
 
-checkwebsite=www.apple.com
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 checkinterval=30
 
 

config/examples/6.rule_default_forwarder/glider.conf

@@ -13,7 +13,8 @@ forward=http://1.1.1.1:8080
 # High Availability mode: ha
 strategy=rr
 
-checkwebsite=www.apple.com
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 checkinterval=30
 
 

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

@@ -1,16 +1,17 @@
 
 
-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
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 checkinterval=30
 
 

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

@@ -10,7 +10,8 @@ forward=http://forwarder2:8080,socks5://forwarder3:1080
 # High Availability mode: ha
 strategy=rr
 
-checkwebsite=www.apple.com
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 checkinterval=30
 
 

config/examples/8.transparent_proxy_with_dnsmasq/README.md

@@ -11,7 +11,6 @@ forward=http://1.1.1.1:8080
 dns=:5353
 dnsserver=8.8.8.8:53
 strategy=rr
-checkwebsite=www.apple.com
 checkinterval=30
 ```
 

config/examples/8.transparent_proxy_with_dnsmasq/glider.conf

@@ -12,5 +12,6 @@ dnsserver=8.8.8.8:53
 
 
 strategy=rr
-checkwebsite=www.apple.com
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 checkinterval=30

config/examples/9.transparent_proxy_without_dnsmasq/README.md

@@ -38,8 +38,7 @@ rules-dir=rules.d
 forward=http://forwarder1:8080,socks5://forwarder2:1080
 forward=http://1.1.1.1:8080
 strategy=rr
-checkwebsite=www.apple.com
-checkinterval=30
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 
 # specify a different dns server(if need)
 dnsserver=208.67.222.222:53
@@ -83,7 +82,8 @@ Set server's nameserver to glider:
 echo nameserver 127.0.0.1 > /etc/resolv.conf
 ```
 
-#### Client DNS settings
+#### 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:
@@ -92,10 +92,10 @@ DNS Resolving:
 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 return the dns answer to client.
+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)
+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/rules.d/home.rule

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

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

@@ -9,7 +9,8 @@ forward=http://forwarder2:8080,socks5://forwarder3:1080
 # Round Robin mode: rr
 # High Availability mode: ha
 strategy=rr
-checkwebsite=www.apple.com
+# forwarder health check
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 checkinterval=30
 
 # specify a different dns server(if need)

config/glider.conf.example

@@ -32,16 +32,17 @@ 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
@@ -51,11 +52,8 @@ listen=socks5://:1080
 # 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 1083 as a udp tunnel, all requests to :1083 will be forward to 1.1.1.1:53
-# listen=udptun://:1083=1.1.1.1:53
+# listen on 1082 as a linux transparent proxy server(tproxy).
+# listen=tproxy://:1082
 
 # http over tls (HTTPS proxy)
 # listen=tls://:443?cert=crtFilePath&key=keyFilePath,http://
@@ -64,10 +62,13 @@ listen=socks5://:1080
 # listen=tls://:443?cert=crtFilePath&key=keyFilePath,ss://AEAD_CHACHA20_POLY1305:pass@
 
 # socks5 over unix domain socket
-# listen=unix:///tmp/glider.socket,socks5://
+# 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,socks5://
+# listen=kcp://aes:key@127.0.0.1:8444?dataShards=10&parityShards=3&mode=fast,socks5://
 
 # vless server
 # listen=vless://UUID@:1234
@@ -79,10 +80,10 @@ listen=socks5://:1080
 # 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
+# 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
+# listen=trojanc://PASSWORD@:1234?fallback=127.0.0.1
 
 # FORWARDERS
 # ----------
@@ -112,9 +113,10 @@ listen=socks5://:1080
 # 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]
+# 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
@@ -128,33 +130,33 @@ listen=socks5://:1080
 # vless forwarder
 # forward=vless://5a146038-0b56-4e95-b1dc-5c6f5a32cd98@1.1.1.1:443
 
-# vmess with none security
+# 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 with aes-128-gcm security
-# forward=vmess://aes-128-gcm: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@?alterID=2
+# 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@?alterID=2
+# 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@?alterID=2
-# forward=tls://server.com:443,ws://@/path,vmess://5a146038-0b56-4e95-b1dc-5c6f5a32cd98@?alterID=2
+# 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,ss://AEAD_CHACHA20_POLY1305:pass@
+# 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:///tmp/glider.socket,socks5://
+# forward=unix:///dev/shm/socket,socks5://
 
 # FORWARDER CHAIN
 # ---------------
@@ -192,10 +194,14 @@ maxfailures=3
 # ----------------
 # 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 interval(seconds)
 checkinterval=30
@@ -206,6 +212,9 @@ 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
 
@@ -214,7 +223,7 @@ checkdisabledonly=false
 # 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
@@ -237,35 +246,52 @@ 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
+# 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,eth1,192.168.50.100,192.168.50.199
+# 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 the outbound ip/interface.
+# 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 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 MORE CONFIG FILES
+# 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

@@ -14,7 +14,7 @@ forward=http://192.168.2.1:8080,socks5://192.168.2.2:1080
 strategy=rr
 
 # FORWARDER CHECK SETTINGS
-checkwebsite=www.apple.com
+check=http://www.msftconnecttest.com/connecttest.txt#expect=200
 checkinterval=30
 
 # DNS SERVER for domains in this rule file
@@ -26,6 +26,7 @@ dnsserver=208.67.222.222:53
 #   - 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

dns/client.go

@@ -5,17 +5,18 @@ import (
 	"errors"
 	"io"
 	"net"
+	"net/netip"
 	"strconv"
 	"strings"
 	"time"
 
-	"github.com/nadoo/glider/log"
-	"github.com/nadoo/glider/pool"
+	"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, ip string) error
+type AnswerHandler func(domain string, ip netip.Addr) error
 
 // Config for dns.
 type Config struct {
@@ -26,6 +27,8 @@ type Config struct {
 	Records   []string
 	AlwaysTCP bool
 	CacheSize int
+	CacheLog  bool
+	NoAAAA    bool
 }
 
 // Client is a dns client struct.
@@ -50,7 +53,9 @@ func NewClient(proxy proxy.Proxy, config *Config) (*Client, error) {
 
 	// custom records
 	for _, record := range config.Records {
-		c.AddRecord(record)
+		if err := c.AddRecord(record); err != nil {
+			log.F("[dns] add record '%s' error: %s", record, err)
+		}
 	}
 
 	return c, nil
@@ -64,13 +69,21 @@ func (c *Client) Exchange(reqBytes []byte, clientAddr string, preferTCP bool) ([
 		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)
 
-			log.F("[dns] %s <-> cache, type: %d, %s",
-				clientAddr, req.Question.QTYPE, req.Question.QNAME)
+			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) {
@@ -106,12 +119,19 @@ func (c *Client) handleAnswer(respBytes []byte, clientAddr, dnsServer, network,
 	}
 
 	ips, ttl := c.extractAnswer(resp)
-	if len(ips) != 0 && ttl > 0 {
-		c.cache.Set(qKey(resp.Question), valCopy(respBytes), ttl)
+	if ttl > c.config.MaxTTL {
+		ttl = c.config.MaxTTL
+	} else if ttl < c.config.MinTTL {
+		ttl = c.config.MinTTL
 	}
 
-	log.F("[dns] %s <-> %s(%s) via %s, type: %d, %s: %s",
-		clientAddr, dnsServer, network, dialerAddr, resp.Question.QTYPE, resp.Question.QNAME, strings.Join(ips, ","))
+	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
 }
@@ -121,11 +141,11 @@ func (c *Client) extractAnswer(resp *Message) ([]string, int) {
 	ttl := c.config.MinTTL
 	for _, answer := range resp.Answers {
 		if answer.TYPE == QTypeA || answer.TYPE == QTypeAAAA {
-			for _, h := range c.handlers {
-				h(resp.Question.QNAME, answer.IP)
-			}
-			if answer.IP != "" {
-				ips = append(ips, answer.IP)
+			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)
@@ -133,12 +153,6 @@ func (c *Client) extractAnswer(resp *Message) ([]string, int) {
 		}
 	}
 
-	if ttl > c.config.MaxTTL {
-		ttl = c.config.MaxTTL
-	} else if ttl < c.config.MinTTL {
-		ttl = c.config.MinTTL
-	}
-
 	return ips, ttl
 }
 
@@ -148,12 +162,13 @@ func (c *Client) exchange(qname string, reqBytes []byte, preferTCP bool) (
 
 	// use tcp to connect upstream server default
 	network = "tcp"
-	dialer := c.proxy.NextDialer(qname + ":53")
+	dialer := c.proxy.NextDialer(qname + ":0")
 
-	// if we are resolving the dialer's domain, then use Direct to avoid denpency loop
+	// 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 strings.Contains(dialer.Addr(), qname) || dialer.Addr() == "REJECT" {
-		dialer = proxy.Default
+	if dialer.Addr() == "REJECT" {
+		dialer = c.proxy.NextDialer("direct:0")
 	}
 
 	// If client uses udp and no forwarders specified, use udp
@@ -164,7 +179,7 @@ func (c *Client) exchange(qname string, reqBytes []byte, preferTCP bool) (
 
 	ups := c.UpStream(qname)
 	server = ups.Server()
-	for i := 0; i < ups.Len(); i++ {
+	for range ups.Len() {
 		var rc net.Conn
 		rc, err = dialer.Dial(network, server)
 		if err != nil {
@@ -271,10 +286,13 @@ func (c *Client) AddHandler(h AnswerHandler) {
 // 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 {
-	r := strings.Split(record, "/")
-	domain, ip := r[0], r[1]
-	m, err := c.MakeResponse(domain, ip)
+	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
 	}
 
@@ -292,27 +310,22 @@ func (c *Client) AddRecord(record string) error {
 }
 
 // MakeResponse makes a dns response message for the given domain and ip address.
-func (c *Client) MakeResponse(domain string, ip string) (*Message, error) {
-	ipb := net.ParseIP(ip)
-	if ipb == nil {
-		return nil, errors.New("GenResponse: invalid ip format")
+// 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 rdata []byte
-	var qtype, rdlen uint16
-	if rdata = ipb.To4(); rdata != nil {
-		qtype = QTypeA
-		rdlen = net.IPv4len
-	} else {
-		qtype = QTypeAAAA
-		rdlen = net.IPv6len
-		rdata = ipb
+	var qtype, rdlen uint16 = QTypeA, net.IPv4len
+	if addr.Is6() {
+		qtype, rdlen = QTypeAAAA, net.IPv6len
 	}
 
-	m := NewMessage(0, Response)
+	m := NewMessage(0, ResponseMsg)
 	m.SetQuestion(NewQuestion(qtype, domain))
 	rr := &RR{NAME: domain, TYPE: qtype, CLASS: ClassINET,
-		TTL: uint32(c.config.MinTTL), RDLENGTH: rdlen, RDATA: rdata}
+		TTL: ttl, RDLENGTH: rdlen, RDATA: addr.AsSlice()}
 	m.AddAnswer(rr)
 
 	return m, nil

dns/message.go

@@ -5,25 +5,25 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
-	"math/rand"
-	"net"
+	"math/rand/v2"
+	"net/netip"
 	"strings"
 )
 
 // UDPMaxLen 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.
-const UDPMaxLen = 512
+// 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 (
-	Query    = 0
-	Response = 1
+	QueryMsg    MsgType = 0
+	ResponseMsg MsgType = 1
 )
 
 // Query types.
@@ -36,21 +36,21 @@ const (
 const ClassINET uint16 = 1
 
 // Message format:
-// https://tools.ietf.org/html/rfc1035#section-4.1
+// 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
+//	+---------------------+
+//	|        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
@@ -64,7 +64,7 @@ type Message struct {
 }
 
 // NewMessage returns a new message.
-func NewMessage(id uint16, msgType int) *Message {
+func NewMessage(id uint16, msgType MsgType) *Message {
 	if id == 0 {
 		id = uint16(rand.Uint32())
 	}
@@ -91,8 +91,7 @@ func (m *Message) AddAnswer(rr *RR) error {
 // Marshal marshals message struct to []byte.
 func (m *Message) Marshal() ([]byte, error) {
 	buf := &bytes.Buffer{}
-	_, err := m.MarshalTo(buf)
-	if err != nil {
+	if _, err := m.MarshalTo(buf); err != nil {
 		return nil, err
 	}
 	return buf.Bytes(), nil
@@ -134,8 +133,7 @@ func UnmarshalMessage(b []byte) (*Message, error) {
 	}
 
 	m := &Message{unMarshaled: b}
-	err := UnmarshalHeader(b[:HeaderLen], &m.Header)
-	if err != nil {
+	if err := UnmarshalHeader(b[:HeaderLen], &m.Header); err != nil {
 		return nil, err
 	}
 
@@ -148,7 +146,7 @@ func UnmarshalMessage(b []byte) (*Message, error) {
 
 	// resp answers
 	rrIdx := HeaderLen + qLen
-	for i := 0; i < int(m.Header.ANCOUNT); i++ {
+	for range int(m.Header.ANCOUNT) {
 		rr := &RR{}
 		rrLen, err := m.UnmarshalRR(rrIdx, rr)
 		if err != nil {
@@ -165,25 +163,24 @@ func UnmarshalMessage(b []byte) (*Message, error) {
 }
 
 // Header format:
-// https://tools.ietf.org/html/rfc1035#section-4.1.1
+// 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                    |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//
+//	                                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
@@ -194,7 +191,7 @@ type Header struct {
 }
 
 // SetMsgType sets the message type.
-func (h *Header) SetMsgType(qr int) {
+func (h *Header) SetMsgType(qr MsgType) {
 	h.Bits |= uint16(qr) << 15
 }
 
@@ -213,10 +210,11 @@ func (h *Header) SetAncount(ancount int) {
 	h.ANCOUNT = uint16(ancount)
 }
 
-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
-}
+// 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) {
@@ -244,22 +242,22 @@ func UnmarshalHeader(b []byte, h *Header) error {
 }
 
 // Question format:
-// https://tools.ietf.org/html/rfc1035#section-4.1.2
+// 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                    |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	                                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
@@ -282,14 +280,12 @@ func (q *Question) MarshalTo(w io.Writer) (n int, err error) {
 		return
 	}
 
-	err = binary.Write(w, binary.BigEndian, q.QTYPE)
-	if err != nil {
+	if err = binary.Write(w, binary.BigEndian, q.QTYPE); err != nil {
 		return
 	}
 	n += 2
 
-	err = binary.Write(w, binary.BigEndian, q.QCLASS)
-	if err != nil {
+	if err = binary.Write(w, binary.BigEndian, q.QCLASS); err != nil {
 		return
 	}
 	n += 2
@@ -322,33 +318,33 @@ func (m *Message) UnmarshalQuestion(b []byte, q *Question) (n int, err error) {
 }
 
 // RR format:
-// https://tools.ietf.org/html/rfc1035#section-3.2.1
-// https://tools.ietf.org/html/rfc1035#section-4.1.3
+// 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                     /
-//     /                                               /
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	                                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
@@ -357,7 +353,7 @@ type RR struct {
 	RDLENGTH uint16
 	RDATA    []byte
 
-	IP string
+	IP netip.Addr
 }
 
 // NewRR returns a new dns rr.
@@ -372,20 +368,17 @@ func (rr *RR) MarshalTo(w io.Writer) (n int, err error) {
 		return
 	}
 
-	err = binary.Write(w, binary.BigEndian, rr.TYPE)
-	if err != nil {
+	if err = binary.Write(w, binary.BigEndian, rr.TYPE); err != nil {
 		return
 	}
 	n += 2
 
-	err = binary.Write(w, binary.BigEndian, rr.CLASS)
-	if err != nil {
+	if err = binary.Write(w, binary.BigEndian, rr.CLASS); err != nil {
 		return
 	}
 	n += 2
 
-	err = binary.Write(w, binary.BigEndian, rr.TTL)
-	if err != nil {
+	if err = binary.Write(w, binary.BigEndian, rr.TTL); err != nil {
 		return
 	}
 	n += 4
@@ -396,8 +389,7 @@ func (rr *RR) MarshalTo(w io.Writer) (n int, err error) {
 	}
 	n += 2
 
-	_, err = w.Write(rr.RDATA)
-	if err != nil {
+	if _, err = w.Write(rr.RDATA); err != nil {
 		return
 	}
 	n += len(rr.RDATA)
@@ -438,9 +430,9 @@ func (m *Message) UnmarshalRR(start int, rr *RR) (n int, err error) {
 	rr.RDATA = p[n+10 : n+10+int(rr.RDLENGTH)]
 
 	if rr.TYPE == QTypeA {
-		rr.IP = net.IP(rr.RDATA[:net.IPv4len]).String()
+		rr.IP = netip.AddrFrom4(*(*[4]byte)(rr.RDATA[:4]))
 	} else if rr.TYPE == QTypeAAAA {
-		rr.IP = net.IP(rr.RDATA[:net.IPv6len]).String()
+		rr.IP = netip.AddrFrom16(*(*[16]byte)(rr.RDATA[:16]))
 	}
 
 	n = n + 10 + int(rr.RDLENGTH)
@@ -479,7 +471,7 @@ func (m *Message) UnmarshalDomainTo(sb *strings.Builder, b []byte) (int, error)
 	var idx, size int
 
 	for len(b[idx:]) != 0 {
-		// https://tools.ietf.org/html/rfc1035#section-4.1.4
+		// https://www.rfc-editor.org/rfc/rfc1035#section-4.1.4
 		// "Message compression",
 		// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 		// | 1  1|                OFFSET                   |
@@ -490,8 +482,7 @@ func (m *Message) UnmarshalDomainTo(sb *strings.Builder, b []byte) (int, error)
 			}
 
 			offset := binary.BigEndian.Uint16(b[idx : idx+2])
-			err := m.UnmarshalDomainPointTo(sb, int(offset&0x3FFF))
-			if err != nil {
+			if err := m.UnmarshalDomainPointTo(sb, int(offset&0x3FFF)); err != nil {
 				return 0, err
 			}
 

dns/server.go

@@ -7,8 +7,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/nadoo/glider/log"
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -80,13 +80,13 @@ func (s *Server) ServePacket(pc net.PacketConn, caddr net.Addr, reqBytes []byte)
 	}()
 
 	if err != nil {
-		log.F("[dns] error in exchange: %s", err)
+		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: %s", err)
+		log.F("[dns] error in local write to %s: %s", caddr, err)
 		return
 	}
 }

dns/upstream.go

@@ -1,6 +1,9 @@
 package dns
 
-import "sync/atomic"
+import (
+	"net"
+	"sync/atomic"
+)
 
 // UPStream is a dns upstream.
 type UPStream struct {
@@ -10,6 +13,12 @@ type UPStream struct {
 
 // 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}
 }
 

feature.go

@@ -9,16 +9,18 @@ import (
 	_ "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/tcptun"
+	_ "github.com/nadoo/glider/proxy/tcp"
 	_ "github.com/nadoo/glider/proxy/tls"
 	_ "github.com/nadoo/glider/proxy/trojan"
-	_ "github.com/nadoo/glider/proxy/udptun"
+	_ "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

@@ -6,5 +6,7 @@ import (
 
 	// 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"
 )

go.mod

@@ -1,28 +1,29 @@
 module github.com/nadoo/glider
 
-go 1.15
+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/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521 // indirect
-	github.com/insomniacslk/dhcp v0.0.0-20200922210017-67c425063dca
-	github.com/mmcloughlin/avo v0.0.0-20201105074841-5d2f697d268f // indirect
-	github.com/nadoo/conflag v0.2.3
-	github.com/nadoo/ipset v0.3.0
-	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
-	github.com/xtaci/kcp-go/v5 v5.6.1
-	golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897
-	golang.org/x/net v0.0.0-20201031054903-ff519b6c9102 // indirect
-	golang.org/x/sys v0.0.0-20201106081118-db71ae66460a // indirect
-	golang.org/x/tools v0.0.0-20201105220310-78b158585360 // indirect
-	gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
+	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
 )
 
-// Replace dependency modules with local developing copy
-// use `go list -m all` to confirm the final module used
-// replace (
-//	github.com/nadoo/conflag => ../conflag
-// )
+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

@@ -1,5 +1,10 @@
+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=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgryski/go-camellia v0.0.0-20191119043421-69a8a13fb23d h1:CPqTNIigGweVPT4CYb+OO2E6XyRKFOmvTHwWRLgCAlE=
@@ -10,136 +15,115 @@ github.com/dgryski/go-rc2 v0.0.0-20150621095337-8a9021637152 h1:ED31mPIxDJnrLt9W
 github.com/dgryski/go-rc2 v0.0.0-20150621095337-8a9021637152/go.mod h1:I9fhc/EvSg88cDxmfQ47v35Ssz9rlFunL/KY0A1JAYI=
 github.com/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521 h1:fBHFH+Y/GPGFGo7LIrErQc3p2MeAhoIQNgaxPWYsSxk=
 github.com/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521/go.mod h1:ucvhdsUCE3TH0LoLRb6ShHiJl8e39dGlx6A4g/ujlow=
-github.com/fanliao/go-promise v0.0.0-20141029170127-1890db352a72/go.mod h1:PjfxuH4FZdUyfMdtBio2lsRr1AKEaVPwelzuHuh8Lqc=
+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
+github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
+github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
+github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
+github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
+github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
+github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
+github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
-github.com/hugelgupf/socketpair v0.0.0-20190730060125-05d35a94e714 h1:/jC7qQFrv8CrSJVmaolDVOxTfS9kc36uB6H40kdbQq8=
-github.com/hugelgupf/socketpair v0.0.0-20190730060125-05d35a94e714/go.mod h1:2Goc3h8EklBH5mspfHFxBnEoURQCGzQQH1ga9Myjvis=
-github.com/insomniacslk/dhcp v0.0.0-20200922210017-67c425063dca h1:zhwTlFGM8ZkD5J/c43IWkxSJQWzhm20QWou8zajbCck=
-github.com/insomniacslk/dhcp v0.0.0-20200922210017-67c425063dca/go.mod h1:R91D4vf3FqLtuRO/oJhs/SMUEqc33OSVsUEI88JuZCc=
-github.com/jsimonetti/rtnetlink v0.0.0-20190606172950-9527aa82566a/go.mod h1:Oz+70psSo5OFh8DBl0Zv2ACw7Esh6pPUphlvZG9x7uw=
-github.com/jsimonetti/rtnetlink v0.0.0-20200117123717-f846d4f6c1f4/go.mod h1:WGuG/smIU4J/54PblvSbh+xvCZmpJnFgr3ds6Z55XMQ=
-github.com/jsimonetti/rtnetlink v0.0.0-20200726165900-d699427278d3/go.mod h1:HrWYfaMfyH5ODyA6hVxnedRaY7Jr4ctlyZf1xJt8gsw=
-github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
-github.com/klauspost/cpuid v1.2.4/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
-github.com/klauspost/cpuid v1.3.1 h1:5JNjFYYQrZeKRJ0734q51WCEEn2huer72Dc7K+R/b6s=
-github.com/klauspost/cpuid v1.3.1/go.mod h1:bYW4mA6ZgKPob1/Dlai2LviZJO7KGI3uoWLd42rAQw4=
-github.com/klauspost/reedsolomon v1.9.9 h1:qCL7LZlv17xMixl55nq2/Oa1Y86nfO8EqDfv2GHND54=
-github.com/klauspost/reedsolomon v1.9.9/go.mod h1:O7yFFHiQwDR6b2t63KPUpccPtNdp5ADgh1gg4fd12wo=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/mdlayher/ethernet v0.0.0-20190606142754-0394541c37b7 h1:lez6TS6aAau+8wXUP3G9I3TGlmPFEq2CTxBaRqY6AGE=
-github.com/mdlayher/ethernet v0.0.0-20190606142754-0394541c37b7/go.mod h1:U6ZQobyTjI/tJyq2HG+i/dfSoFUt8/aZCM+GKtmFk/Y=
-github.com/mdlayher/netlink v0.0.0-20190409211403-11939a169225/go.mod h1:eQB3mZE4aiYnlUsyGGCOpPETfdQq4Jhsgf1fk3cwQaA=
-github.com/mdlayher/netlink v1.0.0/go.mod h1:KxeJAFOFLG6AjpyDkQ/iIhxygIUKD+vcwqcnu43w/+M=
-github.com/mdlayher/netlink v1.1.0/go.mod h1:H4WCitaheIsdF9yOYu8CFmCgQthAPIWZmcKp9uZHgmY=
-github.com/mdlayher/raw v0.0.0-20190606142536-fef19f00fc18/go.mod h1:7EpbotpCmVZcu+KCX4g9WaRNuu11uyhiW7+Le1dKawg=
-github.com/mdlayher/raw v0.0.0-20191009151244-50f2db8cc065 h1:aFkJ6lx4FPip+S+Uw4aTegFMct9shDvP+79PsSxpm3w=
-github.com/mdlayher/raw v0.0.0-20191009151244-50f2db8cc065/go.mod h1:7EpbotpCmVZcu+KCX4g9WaRNuu11uyhiW7+Le1dKawg=
-github.com/mmcloughlin/avo v0.0.0-20200803215136-443f81d77104 h1:ULR/QWMgcgRiZLUjSSJMU+fW+RDMstRdmnDWj9Q+AsA=
-github.com/mmcloughlin/avo v0.0.0-20200803215136-443f81d77104/go.mod h1:wqKykBG2QzQDJEzvRkcS8x6MiSJkF52hXZsXcjaB3ls=
-github.com/mmcloughlin/avo v0.0.0-20201105074841-5d2f697d268f h1:D4I34fbgczGrhrN4DzBCZXT3u/nMWJnGmviIjSzzXSw=
-github.com/mmcloughlin/avo v0.0.0-20201105074841-5d2f697d268f/go.mod h1:6aKT4zZIrpGqB3RpFU14ByCSSyKY6LfJz4J/JJChHfI=
-github.com/nadoo/conflag v0.2.3 h1:/+rTaN0bHTIiQbPl1WZK78JRoqjlNqJ9Zf05ep0o5jI=
-github.com/nadoo/conflag v0.2.3/go.mod h1:dzFfDUpXdr2uS2oV+udpy5N2vfNOu/bFzjhX1WI52co=
-github.com/nadoo/ipset v0.3.0 h1:TgULgp4s2PI3ItoCykDzMp8R49fRhMUNoUUEahERr5o=
-github.com/nadoo/ipset v0.3.0/go.mod h1:ugJe3mH5N1UNQbXayGJnLEMALeiwCJYo49Wg4MnZTHU=
-github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
-github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
+github.com/insomniacslk/dhcp v0.0.0-20250109001534-8abf58130905 h1:q3OEI9RaN/wwcx+qgGo6ZaoJkCiDYe/gjDLfq7lQQF4=
+github.com/insomniacslk/dhcp v0.0.0-20250109001534-8abf58130905/go.mod h1:VvGYjkZoJyKqlmT1yzakUs4mfKMNB0XdODP0+rdml6k=
+github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtLA=
+github.com/josharian/native v1.1.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
+github.com/klauspost/cpuid/v2 v2.2.10 h1:tBs3QSyvjDyFTq3uoc/9xFpCuOsJQFNPiAhYdw2skhE=
+github.com/klauspost/cpuid/v2 v2.2.10/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
+github.com/klauspost/reedsolomon v1.12.4 h1:5aDr3ZGoJbgu/8+j45KtUJxzYm8k08JGtB9Wx1VQ4OA=
+github.com/klauspost/reedsolomon v1.12.4/go.mod h1:d3CzOMOt0JXGIFZm1StgkyF14EYr3xneR2rNWo7NcMU=
+github.com/mdlayher/packet v1.1.2 h1:3Up1NG6LZrsgDVn6X4L9Ge/iyRyxFEFD9o6Pr3Q1nQY=
+github.com/mdlayher/packet v1.1.2/go.mod h1:GEu1+n9sG5VtiRE4SydOmX5GTwyyYlteZiFU+x0kew4=
+github.com/mdlayher/socket v0.4.1 h1:eM9y2/jlbs1M615oshPQOHZzj6R6wMT7bX5NPiQvn2U=
+github.com/mdlayher/socket v0.4.1/go.mod h1:cAqeGjoufqdxWkD7DkpyS+wcefOtmu5OQ8KuoJGIReA=
+github.com/nadoo/conflag v0.3.1 h1:4pHkLIz8PUsfg6ajNYRRSY3bt6m2LPsu6KOzn5uIXQw=
+github.com/nadoo/conflag v0.3.1/go.mod h1:dzFfDUpXdr2uS2oV+udpy5N2vfNOu/bFzjhX1WI52co=
+github.com/nadoo/ipset v0.5.0 h1:5GJUAuZ7ITQQQGne5J96AmFjRtI8Avlbk6CabzYWVUc=
+github.com/nadoo/ipset v0.5.0/go.mod h1:rYF5DQLRGGoQ8ZSWeK+6eX5amAuPqwFkWjhQlEITGJQ=
+github.com/pierrec/lz4/v4 v4.1.22 h1:cKFw6uJDK+/gfw5BcDL0JL5aBsAFdsIT18eRtLj7VIU=
+github.com/pierrec/lz4/v4 v4.1.22/go.mod h1:gZWDp/Ze/IJXGXf23ltt2EXimqmTUXEy0GFuRQyBid4=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
-github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/templexxx/cpu v0.0.1/go.mod h1:w7Tb+7qgcAlIyX4NhLuDKt78AHA5SzPmq0Wj6HiEnnk=
-github.com/templexxx/cpu v0.0.7 h1:pUEZn8JBy/w5yzdYWgx+0m0xL9uk6j4K91C5kOViAzo=
-github.com/templexxx/cpu v0.0.7/go.mod h1:w7Tb+7qgcAlIyX4NhLuDKt78AHA5SzPmq0Wj6HiEnnk=
-github.com/templexxx/xorsimd v0.4.1 h1:iUZcywbOYDRAZUasAs2eSCUW8eobuZDy0I9FJiORkVg=
-github.com/templexxx/xorsimd v0.4.1/go.mod h1:W+ffZz8jJMH2SXwuKu9WhygqBMbFnp14G2fqEr8qaNo=
-github.com/tjfoc/gmsm v1.3.2 h1:7JVkAn5bvUJ7HtU08iW6UiD+UTmJTIToHCfeFzkcCxM=
-github.com/tjfoc/gmsm v1.3.2/go.mod h1:HaUcFuY0auTiaHB9MHFGCPx5IaLhTUd2atbCFBQXn9w=
-github.com/u-root/u-root v7.0.0+incompatible h1:u+KSS04pSxJGI5E7WE4Bs9+Zd75QjFv+REkjy/aoAc8=
-github.com/u-root/u-root v7.0.0+incompatible/go.mod h1:RYkpo8pTHrNjW08opNd/U6p/RJE7K0D8fXO0d47+3YY=
-github.com/xtaci/kcp-go/v5 v5.6.1 h1:Pwn0aoeNSPF9dTS7IgiPXn0HEtaIlVb6y5UKWPsx8bI=
-github.com/xtaci/kcp-go/v5 v5.6.1/go.mod h1:W3kVPyNYwZ06p79dNwFWQOVFrdcBpDBsdyvK8moQrYo=
+github.com/templexxx/cpu v0.1.1 h1:isxHaxBXpYFWnk2DReuKkigaZyrjs2+9ypIdGP4h+HI=
+github.com/templexxx/cpu v0.1.1/go.mod h1:w7Tb+7qgcAlIyX4NhLuDKt78AHA5SzPmq0Wj6HiEnnk=
+github.com/templexxx/xorsimd v0.4.3 h1:9AQTFHd7Bhk3dIT7Al2XeBX5DWOvsUPZCuhyAtNbHjU=
+github.com/templexxx/xorsimd v0.4.3/go.mod h1:oZQcD6RFDisW2Am58dSAGwwL6rHjbzrlu25VDqfWkQg=
+github.com/tjfoc/gmsm v1.4.1 h1:aMe1GlZb+0bLjn+cKTPEvvn9oUEBlJitaZiiBwsbgho=
+github.com/tjfoc/gmsm v1.4.1/go.mod h1:j4INPkHWMrhJb38G+J6W4Tw0AbuN8Thu3PbdVYhVcTE=
+github.com/u-root/uio v0.0.0-20240224005618-d2acac8f3701 h1:pyC9PaHYZFgEKFdlp3G8RaCKgVpHZnecvArXvPXcFkM=
+github.com/u-root/uio v0.0.0-20240224005618-d2acac8f3701/go.mod h1:P3a5rG4X7tI17Nn3aOIAYr5HbIMukwXG0urG0WuL8OA=
+github.com/xtaci/kcp-go/v5 v5.6.18 h1:7oV4mc272pcnn39/13BB11Bx7hJM4ogMIEokJYVWn4g=
+github.com/xtaci/kcp-go/v5 v5.6.18/go.mod h1:75S1AKYYzNUSXIv30h+jPKJYZUwqpfvLshu63nCNSOM=
 github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae h1:J0GxkO96kL4WF+AIT3M4mfUVinOCPgf2uUWYFUzN0sM=
 github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae/go.mod h1:gXtu8J62kEgmN++bm9BVICuT/e8yiLI2KFobd/TRFsE=
-github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
-github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
-github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
-golang.org/x/arch v0.0.0-20190909030613-46d78d1859ac/go.mod h1:flIaEI6LNU6xOCD5PaJvn9wGP0agmIOqjrtsKGRguv4=
-golang.org/x/arch v0.0.0-20201008161808-52c3e6f60cff/go.mod h1:flIaEI6LNU6xOCD5PaJvn9wGP0agmIOqjrtsKGRguv4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20191219195013-becbf705a915/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897 h1:pLI5jrR7OSLijeIDcmRxNmw2api+jEfxLoykJVice/E=
-golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.3.0 h1:RM4zey1++hCTbCVQfnWeKs9/IEsaBLA8vTkd0WVtmH4=
-golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.35.0 h1:b15kiHdrGCHrP6LvwaQ3c03kgNhhiMgvlhxHQhmg2Xs=
+golang.org/x/crypto v0.35.0/go.mod h1:dy7dXNW32cAb/6/PRuTNsix8T+vJAqvuIy5Bli/x0YQ=
+golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
+golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
+golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
+golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
+golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190419010253-1f3472d942ba/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20191007182048-72f939374954/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
-golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
-golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
-golang.org/x/net v0.0.0-20201031054903-ff519b6c9102 h1:42cLlJJdEh+ySyeUUbEQ5bsTiq8voBeTuweGVkY6Puw=
-golang.org/x/net v0.0.0-20201031054903-ff519b6c9102/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/net v0.0.0-20201010224723-4f7140c49acb/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
+golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
+golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
+golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
+golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190411185658-b44545bcd369/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190418153312-f0ce4c0180be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190606122018-79a91cf218c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200808120158-1030fc2bf1d9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200916030750-2334cc1a136f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201106081118-db71ae66460a h1:ALUFBKlIyeY7y5ZgPJmblk/vKz+zBQSnNiPkt41sgeg=
-golang.org/x/sys v0.0.0-20201106081118-db71ae66460a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
+golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/term v0.29.0 h1:L6pJp37ocefwRRtYPKSWOWzOtWSxVajvz2ldH/xi3iU=
+golang.org/x/term v0.29.0/go.mod h1:6bl4lRlvVuDgSf3179VpIxBF0o10JUpXWOnI7nErv7s=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20200425043458-8463f397d07c/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
-golang.org/x/tools v0.0.0-20200808161706-5bf02b21f123/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
-golang.org/x/tools v0.0.0-20201105001634-bc3cf281b174 h1:0rx0F4EjJNbxTuzWe0KjKcIzs+3VEb/Mrs/d1ciNz1c=
-golang.org/x/tools v0.0.0-20201105001634-bc3cf281b174/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
-golang.org/x/tools v0.0.0-20201105220310-78b158585360 h1:/9CzsU8hOpnSUCtem1vfWNgsVeCTgkMdx+VE5YIYxnU=
-golang.org/x/tools v0.0.0-20201105220310-78b158585360/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
+golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b h1:QRR6H1YWRnHb4Y/HeNFCTJLFVxaq6wH4YuVdsUOr75U=
-gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
+google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
+google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
+google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
+google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
+google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
+google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
+google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+gopkg.in/yaml.v3 v3.0.0 h1:hjy8E9ON/egN1tAYqKb61G10WtihqetD4sz2H+8nIeA=
+gopkg.in/yaml.v3 v3.0.0/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

ipset/ipset_linux.go

@@ -1,7 +1,7 @@
 package ipset
 
 import (
-	"errors"
+	"net/netip"
 	"strings"
 	"sync"
 
@@ -21,32 +21,30 @@ func NewManager(rules []*rule.Config) (*Manager, error) {
 		return nil, err
 	}
 
-	// create ipset, avoid redundant.
-	sets := make(map[string]struct{})
-	for _, r := range rules {
-		if r.IPSet != "" {
-			sets[r.IPSet] = struct{}{}
-		}
-	}
-
-	for set := range sets {
-		ipset.Create(set)
-		ipset.Flush(set)
-	}
-
-	// init ipset
 	m := &Manager{}
+	sets := make(map[string]struct{})
+
 	for _, r := range rules {
-		if r.IPSet != "" {
-			for _, domain := range r.Domain {
-				m.domainSet.Store(domain, r.IPSet)
-			}
-			for _, ip := range r.IP {
-				ipset.Add(r.IPSet, ip)
-			}
-			for _, cidr := range r.CIDR {
-				ipset.Add(r.IPSet, cidr)
-			}
+		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)
 		}
 	}
 
@@ -54,18 +52,27 @@ func NewManager(rules []*rule.Config) (*Manager, error) {
 }
 
 // AddDomainIP implements the dns AnswerHandler function, used to update ipset according to domainSet rule.
-func (m *Manager) AddDomainIP(domain, ip string) error {
-	if domain == "" || ip == "" {
-		return errors.New("please specify the domain and ip address")
-	}
-
+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 {
-			ipset.Add(setName.(string), ip)
+			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

@@ -1,9 +1,10 @@
-// +build !linux
+//go:build !linux
 
 package ipset
 
 import (
 	"errors"
+	"net/netip"
 
 	"github.com/nadoo/glider/rule"
 )
@@ -17,6 +18,6 @@ func NewManager(rules []*rule.Config) (*Manager, error) {
 }
 
 // AddDomainIP implements the DNSAnswerHandler function
-func (m *Manager) AddDomainIP(domain, ip string) error {
+func (m *Manager) AddDomainIP(domain string, ip netip.Addr) error {
 	return errors.New("ipset not supported on this os")
 }

log/log.go

@@ -1,35 +0,0 @@
-package log
-
-import (
-	"fmt"
-	stdlog "log"
-)
-
-// F is the main log function.
-var F = func(string, ...interface{}) {}
-
-// Debugf prints debug log.
-func Debugf(format string, v ...interface{}) {
-	stdlog.SetFlags(stdlog.LstdFlags | stdlog.Lshortfile)
-	stdlog.Output(2, fmt.Sprintf(format, v...))
-}
-
-// Print prints log.
-func Print(v ...interface{}) {
-	stdlog.Print(v...)
-}
-
-// Printf prints log.
-func Printf(format string, v ...interface{}) {
-	stdlog.Printf(format, v...)
-}
-
-// Fatal log and exit.
-func Fatal(v ...interface{}) {
-	stdlog.Fatal(v...)
-}
-
-// Fatalf log and exit.
-func Fatalf(f string, v ...interface{}) {
-	stdlog.Fatalf(f, v...)
-}

main.go

@@ -5,26 +5,25 @@ import (
 	"net"
 	"os"
 	"os/signal"
-	"strings"
 	"syscall"
 	"time"
 
 	"github.com/nadoo/glider/dns"
 	"github.com/nadoo/glider/ipset"
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
 	"github.com/nadoo/glider/proxy"
 	"github.com/nadoo/glider/rule"
 	"github.com/nadoo/glider/service"
 )
 
 var (
-	version = "0.12.2"
+	version = "0.17.0"
 	config  = parseConfig()
 )
 
 func main() {
 	// global rule proxy
-	pxy := rule.NewProxy(config.Forwards, &config.StrategyConfig, config.rules)
+	pxy := rule.NewProxy(config.Forwards, &config.Strategy, config.rules)
 
 	// ipset manager
 	ipsetM, _ := ipset.NewManager(config.rules)
@@ -38,8 +37,8 @@ func main() {
 
 		// rules
 		for _, r := range config.rules {
-			for _, domain := range r.Domain {
-				if len(r.DNSServers) > 0 {
+			if len(r.DNSServers) > 0 {
+				for _, domain := range r.Domain {
 					d.SetServers(domain, r.DNSServers)
 				}
 			}
@@ -63,6 +62,10 @@ func main() {
 		}
 	}
 
+	for _, r := range config.rules {
+		r.IP, r.CIDR, r.Domain = nil, nil, nil
+	}
+
 	// enable checkers
 	pxy.Check()
 
@@ -72,14 +75,16 @@ func main() {
 		if err != nil {
 			log.Fatal(err)
 		}
-
 		go local.ListenAndServe()
 	}
 
 	// run services
 	for _, s := range config.Services {
-		args := strings.Split(s, ",")
-		go service.Run(args[0], args[1:]...)
+		service, err := service.New(s)
+		if err != nil {
+			log.Fatal(err)
+		}
+		go service.Run()
 	}
 
 	sigCh := make(chan os.Signal, 1)

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

@@ -3,6 +3,7 @@ package pool
 import (
 	"math/bits"
 	"sync"
+	"unsafe"
 )
 
 const (
@@ -17,11 +18,12 @@ var (
 )
 
 func init() {
-	for i := 0; i < num; i++ {
+	for i := range num {
 		size := 1 << i
 		sizes[i] = size
-		pools[i].New = func() interface{} {
-			return make([]byte, size)
+		pools[i].New = func() any {
+			buf := make([]byte, size)
+			return unsafe.SliceData(buf)
 		}
 	}
 }
@@ -30,11 +32,10 @@ func init() {
 // 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 sizes[i] < size {
-			i += 1
+		i := bits.Len32(uint32(size - 1))
+		if p := pools[i].Get().(*byte); p != nil {
+			return unsafe.Slice(p, 1<<i)[:size]
 		}
-		return pools[i].Get().([]byte)[:size]
 	}
 	return make([]byte, size)
 }
@@ -42,9 +43,9 @@ func GetBuffer(size int) []byte {
 // PutBuffer puts a buffer into pool.
 func PutBuffer(buf []byte) {
 	if size := cap(buf); size >= 1 && size <= maxsize {
-		i := bits.Len32(uint32(size)) - 1
+		i := bits.Len32(uint32(size - 1))
 		if sizes[i] == size {
-			pools[i].Put(buf)
+			pools[i].Put(unsafe.SliceData(buf))
 		}
 	}
 }

pkg/pool/bytesbuffer.go

@@ -6,7 +6,7 @@ import (
 )
 
 var bytesBufPool = sync.Pool{
-	New: func() interface{} { return &bytes.Buffer{} },
+	New: func() any { return &bytes.Buffer{} },
 }
 
 // GetBytesBuffer returns a bytes.buffer from pool.
@@ -16,10 +16,8 @@ func GetBytesBuffer() *bytes.Buffer {
 
 // PutBytesBuffer puts a bytes.buffer into pool.
 func PutBytesBuffer(buf *bytes.Buffer) {
-	if buf.Cap() > 64<<10 {
-		return
+	if buf.Cap() <= 64<<10 {
+		buf.Reset()
+		bytesBufPool.Put(buf)
 	}
-
-	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

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"io"
 	"net"
+	"net/netip"
 	"strconv"
 )
 
@@ -67,11 +68,12 @@ func (a Addr) String() string {
 	return net.JoinHostPort(host, port)
 }
 
-// ReadAddrBuf reads just enough bytes from r to get a valid Addr.
-func ReadAddrBuf(r io.Reader, b []byte) (Addr, error) {
-	if len(b) < MaxAddrLen {
-		return nil, io.ErrShortBuffer
-	}
+// 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
@@ -96,11 +98,6 @@ func ReadAddrBuf(r io.Reader, b []byte) (Addr, error) {
 	return nil, Errors[8]
 }
 
-// ReadAddr reads just enough bytes from r to get a valid Addr.
-func ReadAddr(r io.Reader) (Addr, error) {
-	return ReadAddrBuf(r, make([]byte, MaxAddrLen))
-}
-
 // SplitAddr slices a SOCKS address from beginning of b. Returns nil if failed.
 func SplitAddr(b []byte) Addr {
 	addrLen := 1
@@ -136,16 +133,16 @@ func ParseAddr(s string) Addr {
 	if err != nil {
 		return nil
 	}
-	if ip := net.ParseIP(host); ip != nil {
-		if ip4 := ip.To4(); ip4 != nil {
+
+	if ip, err := netip.ParseAddr(host); err == nil {
+		if ip.Is4() {
 			addr = make([]byte, 1+net.IPv4len+2)
 			addr[0] = ATypIP4
-			copy(addr[1:], ip4)
 		} else {
 			addr = make([]byte, 1+net.IPv6len+2)
 			addr[0] = ATypIP6
-			copy(addr[1:], ip)
 		}
+		copy(addr[1:], ip.AsSlice())
 	} else {
 		if len(host) > 255 {
 			return nil

proxy/conn.go

@@ -10,15 +10,15 @@ import (
 	"sync"
 	"time"
 
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/pool"
 )
 
-const (
+var (
 	// TCPBufSize is the size of tcp buffer.
 	TCPBufSize = 32 << 10
 
 	// UDPBufSize is the size of udp buffer.
-	UDPBufSize = 64 << 10
+	UDPBufSize = 2 << 10
 )
 
 // Conn is a connection with buffered reader.
@@ -45,6 +45,12 @@ 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
@@ -73,12 +79,6 @@ func Relay(left, right net.Conn) error {
 	return nil
 }
 
-// Close closes the Conn.
-func (c *Conn) Close() error {
-	pool.PutBufReader(c.r)
-	return c.Conn.Close()
-}
-
 // Copy copies from src to dst.
 func Copy(dst io.Writer, src io.Reader) (written int64, err error) {
 	dst = underlyingWriter(dst)
@@ -175,19 +175,30 @@ func CopyBuffer(dst io.Writer, src io.Reader) (written int64, err error) {
 	return written, err
 }
 
-// RelayUDP copys from src to dst at target with read timeout.
-func RelayUDP(dst net.PacketConn, target net.Addr, src net.PacketConn, timeout time.Duration) error {
-	b := pool.GetBuffer(UDPBufSize)
-	defer pool.PutBuffer(b)
+// 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 {
-		src.SetReadDeadline(time.Now().Add(timeout))
-		n, _, err := src.ReadFrom(b)
+		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
 		}
 
-		_, err = dst.WriteTo(b[:n], target)
+		if writeTo != nil {
+			addr = writeTo
+		}
+
+		_, err = dst.WriteTo(buf[:n], addr)
 		if err != nil {
 			return err
 		}

proxy/dialer.go

@@ -3,9 +3,15 @@ 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
@@ -27,7 +33,7 @@ type UDPDialer interface {
 	Addr() string
 
 	// DialUDP connects to the given address
-	DialUDP(network, addr string) (pc net.PacketConn, writeTo net.Addr, err error)
+	DialUDP(network, addr string) (pc net.PacketConn, err error)
 }
 
 // DialerCreator is a function to create dialers.
@@ -49,6 +55,10 @@ func DialerFromURL(s string, dialer Dialer) (Dialer, error) {
 		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 {
@@ -57,3 +67,13 @@ func DialerFromURL(s string, dialer Dialer) (Dialer, error) {
 
 	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

@@ -1,11 +1,13 @@
 package proxy
 
 import (
+	"context"
 	"errors"
 	"net"
+	"net/netip"
 	"time"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/sockopt"
 )
 
 // Direct proxy.
@@ -16,16 +18,17 @@ type Direct struct {
 	relayTimeout time.Duration
 }
 
-// Default dialer.
-var Default = &Direct{dialTimeout: time.Second * 3}
+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 ip := net.ParseIP(intface); ip != nil {
-			d.ip = net.ParseIP(intface)
+		if addr, err := netip.ParseAddr(intface); err == nil {
+			d.ip = addr.AsSlice()
 		} else {
 			iface, err := net.InterfaceByName(intface)
 			if err != nil {
@@ -38,6 +41,14 @@ func NewDirect(intface string, dialTimeout, relayTimeout time.Duration) (*Direct
 	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" }
 
@@ -76,6 +87,10 @@ func (d *Direct) dial(network, addr string, localIP net.IP) (net.Conn, error) {
 	}
 
 	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
@@ -93,33 +108,44 @@ func (d *Direct) dial(network, addr string, localIP net.IP) (net.Conn, error) {
 }
 
 // DialUDP connects to the given address.
-func (d *Direct) DialUDP(network, addr string) (net.PacketConn, net.Addr, error) {
-	// TODO: support specifying local interface
+func (d *Direct) DialUDP(network, addr string) (net.PacketConn, error) {
 	var la string
 	if d.ip != nil {
-		la = d.ip.String() + ":0"
+		la = net.JoinHostPort(d.ip.String(), "0")
 	}
 
-	pc, err := net.ListenPacket(network, la)
-	if err != nil {
-		log.F("ListenPacket error: %s", err)
-		return nil, nil, err
+	lc := &net.ListenConfig{}
+	if d.iface != nil {
+		lc.Control = sockopt.Control(sockopt.Bind(d.iface))
 	}
 
-	uAddr, err := net.ResolveUDPAddr("udp", addr)
-	return pc, uAddr, err
+	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()
+	ipNets, err := d.iface.Addrs()
 	if err != nil {
 		return
 	}
-
-	for _, ipnet := range ipnets {
-		ips = append(ips, ipnet.(*net.IPNet).IP) //!ip.IsLinkLocalUnicast()
+	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

@@ -6,8 +6,8 @@ import (
 	"net"
 	"net/textproto"
 
-	"github.com/nadoo/glider/log"
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -33,6 +33,8 @@ func (s *HTTP) Dial(network, addr string) (net.Conn, error) {
 	}
 
 	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")
@@ -45,7 +47,6 @@ func (s *HTTP) Dial(network, addr string) (net.Conn, error) {
 	// header ended
 	buf.WriteString("\r\n")
 	_, err = rc.Write(buf.Bytes())
-	pool.PutBytesBuffer(buf)
 	if err != nil {
 		return nil, err
 	}
@@ -76,6 +77,6 @@ func (s *HTTP) Dial(network, addr string) (net.Conn, error) {
 }
 
 // DialUDP connects to the given address via the proxy.
-func (s *HTTP) DialUDP(network, addr string) (pc net.PacketConn, writeTo net.Addr, err error) {
-	return nil, nil, errors.New("http client does not support udp")
+func (s *HTTP) DialUDP(network, addr string) (pc net.PacketConn, err error) {
+	return nil, proxy.ErrNotSupported
 }

proxy/http/http.go

@@ -11,7 +11,7 @@ import (
 	"net/url"
 	"strings"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -112,3 +112,10 @@ func extractUserPass(auth string) (username, password string, ok bool) {
 
 	return s[:idx], s[idx+1:], true
 }
+
+func init() {
+	proxy.AddUsage("http", `
+Http scheme:
+  http://[user:pass@]host:port
+`)
+}

proxy/http/request.go

@@ -3,16 +3,16 @@ package http
 import (
 	"bufio"
 	"bytes"
-	"errors"
+	"fmt"
 	"net/textproto"
 	"net/url"
 	"strings"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
 )
 
 // Methods are http methods from rfc.
-// https://www.ietf.org/rfc/rfc2616.txt, http methods must be uppercase
+// https://www.rfc-editor.org/rfc/rfc2616, http methods must be uppercase
 var Methods = [...][]byte{
 	[]byte("GET"),
 	[]byte("POST"),
@@ -46,7 +46,7 @@ func parseRequest(r *bufio.Reader) (*request, error) {
 
 	method, uri, proto, ok := parseStartLine(line)
 	if !ok {
-		return nil, errors.New("error in parseStartLine")
+		return nil, fmt.Errorf("error in parseStartLine: %s", line)
 	}
 
 	header, err := tpr.ReadMIMEHeader()

proxy/http/server.go

@@ -8,8 +8,8 @@ import (
 	"strings"
 	"time"
 
-	"github.com/nadoo/glider/log"
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -22,7 +22,7 @@ func NewHTTPServer(s string, p proxy.Proxy) (proxy.Server, error) {
 func (s *HTTP) ListenAndServe() {
 	l, err := net.Listen("tcp", s.addr)
 	if err != nil {
-		log.F("[http] failed to listen on %s: %v", s.addr, err)
+		log.Fatalf("[http] failed to listen on %s: %v", s.addr, err)
 		return
 	}
 	defer l.Close()
@@ -42,22 +42,22 @@ func (s *HTTP) ListenAndServe() {
 
 // Serve serves a connection.
 func (s *HTTP) Serve(cc net.Conn) {
-	defer cc.Close()
-
 	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", c.RemoteAddr())
+		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())
+		log.F("[http] %s <-> %s, pretend as web server", c.RemoteAddr().String(), s.Addr())
 		return
 	}
 

proxy/kcp/kcp.go

@@ -12,7 +12,7 @@ import (
 	kcp "github.com/xtaci/kcp-go/v5"
 	"golang.org/x/crypto/pbkdf2"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -25,6 +25,7 @@ type KCP struct {
 	key   string
 	crypt string
 	block kcp.BlockCrypt
+	mode  string
 
 	dataShards   int
 	parityShards int
@@ -81,6 +82,7 @@ func NewKCP(s string, d proxy.Dialer, p proxy.Proxy) (*KCP, error) {
 		addr:         addr,
 		key:          key,
 		crypt:        crypt,
+		mode:         query.Get("mode"),
 		dataShards:   int(dataShards),
 		parityShards: int(parityShards),
 	}
@@ -92,6 +94,10 @@ func NewKCP(s string, d proxy.Dialer, p proxy.Proxy) (*KCP, error) {
 		}
 	}
 
+	if k.mode == "" {
+		k.mode = "fast"
+	}
+
 	return k, nil
 }
 
@@ -137,22 +143,17 @@ func NewKCPDialer(s string, d proxy.Dialer) (proxy.Dialer, error) {
 
 // NewKCPServer returns a kcp proxy server.
 func NewKCPServer(s string, p proxy.Proxy) (proxy.Server, error) {
-	transport := strings.Split(s, ",")
-
-	// prepare transport listener
-	// TODO: check here
-	if len(transport) < 2 {
-		return nil, errors.New("[kcp] malformd listener:" + s)
-	}
-
-	k, err := NewKCP(transport[0], nil, p)
+	schemes := strings.SplitN(s, ",", 2)
+	k, err := NewKCP(schemes[0], nil, p)
 	if err != nil {
 		return nil, err
 	}
 
-	k.server, err = proxy.ServerFromURL(transport[1], 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
@@ -162,7 +163,7 @@ func NewKCPServer(s string, p proxy.Proxy) (proxy.Server, error) {
 func (s *KCP) ListenAndServe() {
 	l, err := kcp.ListenWithOptions(s.addr, s.block, s.dataShards, s.parityShards)
 	if err != nil {
-		log.F("[kcp] failed to listen on %s: %v", s.addr, err)
+		log.Fatalf("[kcp] failed to listen on %s: %v", s.addr, err)
 		return
 	}
 	defer l.Close()
@@ -176,13 +177,7 @@ func (s *KCP) ListenAndServe() {
 			continue
 		}
 
-		// TODO: change them to customizable later?
-		c.SetStreamMode(true)
-		c.SetWriteDelay(false)
-		c.SetNoDelay(0, 30, 2, 1)
-		c.SetWindowSize(1024, 1024)
-		c.SetMtu(1350)
-		c.SetACKNoDelay(true)
+		s.setParams(c)
 
 		go s.Serve(c)
 	}
@@ -190,11 +185,30 @@ func (s *KCP) ListenAndServe() {
 
 // Serve serves connections.
 func (s *KCP) Serve(c net.Conn) {
-	// we know the internal server will close the connection after serve
-	// defer c.Close()
-
 	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)
+		}
 	}
 }
 
@@ -215,13 +229,7 @@ func (s *KCP) Dial(network, addr string) (net.Conn, error) {
 		return nil, err
 	}
 
-	// TODO: change them to customizable later?
-	c.SetStreamMode(true)
-	c.SetWriteDelay(false)
-	c.SetNoDelay(0, 30, 2, 1)
-	c.SetWindowSize(1024, 1024)
-	c.SetMtu(1350)
-	c.SetACKNoDelay(true)
+	s.setParams(c)
 
 	c.SetDSCP(0)
 	c.SetReadBuffer(4194304)
@@ -231,6 +239,43 @@ func (s *KCP) Dial(network, addr string) (net.Conn, error) {
 }
 
 // DialUDP connects to the given address via the proxy.
-func (s *KCP) DialUDP(network, addr string) (net.PacketConn, net.Addr, error) {
-	return nil, nil, errors.New("kcp client does not support udp now")
+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

@@ -1,11 +1,10 @@
 package mixed
 
 import (
-	"bytes"
 	"net"
 	"net/url"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
 	"github.com/nadoo/glider/proxy"
 	"github.com/nadoo/glider/proxy/http"
 	"github.com/nadoo/glider/proxy/socks5"
@@ -61,11 +60,11 @@ func (m *Mixed) ListenAndServe() {
 
 	l, err := net.Listen("tcp", m.addr)
 	if err != nil {
-		log.F("[mixed] failed to listen on %s: %v", m.addr, err)
+		log.Fatalf("[mixed] failed to listen on %s: %v", m.addr, err)
 		return
 	}
 
-	log.F("[mixed] listening TCP on %s", m.addr)
+	log.F("[mixed] http & socks5 server listening TCP on %s", m.addr)
 
 	for {
 		c, err := l.Accept()
@@ -80,37 +79,12 @@ func (m *Mixed) ListenAndServe() {
 
 // Serve serves connections.
 func (m *Mixed) Serve(c net.Conn) {
-	defer c.Close()
-
-	if c, ok := c.(*net.TCPConn); ok {
-		c.SetKeepAlive(true)
-	}
-
-	cc := proxy.NewConn(c)
-	head, err := cc.Peek(1)
-	if err != nil {
-		// log.F("[mixed] socks5 peek error: %s", err)
-		return
-	}
-
-	// check socks5, client send socksversion: 5 as the first byte
-	if head[0] == socks5.Version {
-		m.socks5Server.Serve(cc)
-		return
-	}
-
-	head, err = cc.Peek(8)
-	if err != nil {
-		log.F("[mixed] http peek error: %s", err)
-		return
-	}
-
-	for _, method := range http.Methods {
-		if bytes.HasPrefix(head, method) {
-			m.httpServer.Serve(cc)
+	conn := proxy.NewConn(c)
+	if head, err := conn.Peek(1); err == nil {
+		if head[0] == socks5.Version {
+			m.socks5Server.Serve(conn)
 			return
 		}
 	}
-
-	log.F("[mixed] unknown request from %s, ignored", c.RemoteAddr())
+	m.httpServer.Serve(conn)
 }

proxy/obfs/http.go

@@ -7,7 +7,7 @@ import (
 	"io"
 	"net"
 
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/pool"
 )
 
 // HTTPObfs struct

proxy/obfs/obfs.go

@@ -6,7 +6,7 @@ import (
 	"net"
 	"net/url"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -106,6 +106,16 @@ func (s *Obfs) Dial(network, addr string) (net.Conn, error) {
 }
 
 // DialUDP connects to the given address via the proxy.
-func (s *Obfs) DialUDP(network, addr string) (net.PacketConn, net.Addr, error) {
-	return nil, nil, errors.New("obfs client does not support udp now")
+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

@@ -1,4 +1,4 @@
-// https://www.ietf.org/rfc/rfc5246.txt
+// https://www.rfc-editor.org/rfc/rfc5246
 // https://golang.org/src/crypto/tls/handshake_messages.go
 
 // NOTE:
@@ -17,7 +17,7 @@ import (
 	"net"
 	"time"
 
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/pool"
 )
 
 const (
@@ -64,10 +64,7 @@ func (c *TLSObfsConn) Write(b []byte) (int, error) {
 	n := len(b)
 	for i := 0; i < n; i += chunkSize {
 		buf.Reset()
-		end := i + chunkSize
-		if end > n {
-			end = n
-		}
+		end := min(i+chunkSize, n)
 
 		buf.Write([]byte{0x17, 0x03, 0x03})
 		binary.Write(buf, binary.BigEndian, uint16(len(b[i:end])))

proxy/proxy.go

@@ -1,6 +1,9 @@
 package proxy
 
-import "net"
+import (
+	"net"
+	"strings"
+)
 
 // Proxy is a dialer manager.
 type Proxy interface {
@@ -8,7 +11,7 @@ type Proxy interface {
 	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, writeTo net.Addr, err error)
+	DialUDP(network, addr string) (pc net.PacketConn, dialer UDPDialer, err error)
 
 	// Get the dialer by dstAddr.
 	NextDialer(dstAddr string) Dialer
@@ -16,3 +19,28 @@ type Proxy interface {
 	// 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

@@ -2,12 +2,13 @@ package redir
 
 import (
 	"net"
+	"net/netip"
 	"net/url"
 	"strings"
 	"syscall"
 	"unsafe"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -55,7 +56,7 @@ func NewRedir6Server(s string, p proxy.Proxy) (proxy.Server, error) {
 func (s *RedirProxy) ListenAndServe() {
 	l, err := net.Listen("tcp", s.addr)
 	if err != nil {
-		log.F("[redir] failed to listen on %s: %v", s.addr, err)
+		log.Fatalf("[redir] failed to listen on %s: %v", s.addr, err)
 		return
 	}
 
@@ -83,19 +84,20 @@ func (s *RedirProxy) Serve(cc net.Conn) {
 	}
 
 	c.SetKeepAlive(true)
-	tgt, err := getOrigDst(c, s.ipv6)
+	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.String() {
+	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.String())
+	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
@@ -114,12 +116,12 @@ func (s *RedirProxy) Serve(cc net.Conn) {
 }
 
 // Get the original destination of a TCP connection.
-func getOrigDst(c *net.TCPConn, ipv6 bool) (*net.TCPAddr, error) {
+func getOrigDst(c *net.TCPConn, ipv6 bool) (netip.AddrPort, error) {
 	rc, err := c.SyscallConn()
 	if err != nil {
-		return nil, err
+		return netip.AddrPort{}, err
 	}
-	var addr *net.TCPAddr
+	var addr netip.AddrPort
 	rc.Control(func(fd uintptr) {
 		if ipv6 {
 			addr, err = getorigdstIPv6(fd)
@@ -131,32 +133,29 @@ func getOrigDst(c *net.TCPConn, ipv6 bool) (*net.TCPAddr, error) {
 }
 
 // Call getorigdst() from linux/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
-func getorigdst(fd uintptr) (*net.TCPAddr, error) {
+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 nil, err
+		return netip.AddrPort{}, err
 	}
-	var addr net.TCPAddr
-	addr.IP = raw.Addr[:]
-	port := (*[2]byte)(unsafe.Pointer(&raw.Port)) // raw.Port is big-endian
-	addr.Port = int(port[0])<<8 | int(port[1])
-	return &addr, nil
+	// 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
-// NOTE: I haven't tried yet but it should work since Linux 3.8.
-func getorigdstIPv6(fd uintptr) (*net.TCPAddr, error) {
+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 nil, err
+		return netip.AddrPort{}, err
 	}
-	var addr net.TCPAddr
-	addr.IP = raw.Addr[:]
-	port := (*[2]byte)(unsafe.Pointer(&raw.Port)) // raw.Port is big-endian
-	addr.Port = int(port[0])<<8 | int(port[1])
-	return &addr, nil
+	// 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_other.go

@@ -1,4 +1,4 @@
-// +build linux,!386
+//go:build linux && !386
 
 package redir
 

proxy/reject/reject.go

@@ -34,6 +34,13 @@ func (s *Reject) Dial(network, addr string) (net.Conn, error) {
 }
 
 // DialUDP connects to the given address via the proxy.
-func (s *Reject) DialUDP(network, addr string) (net.PacketConn, net.Addr, error) {
-	return nil, nil, errors.New("REJECT")
+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

@@ -3,6 +3,7 @@ package proxy
 import (
 	"errors"
 	"net"
+	"sort"
 	"strings"
 )
 
@@ -15,6 +16,11 @@ type Server interface {
 	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)
 
@@ -28,9 +34,9 @@ func RegisterServer(name string, c ServerCreator) {
 }
 
 // ServerFromURL calls the registered creator to create proxy servers.
-// dialer is the default upstream dialer so cannot be nil, we can use Default when calling this function.
-func ServerFromURL(s string, p Proxy) (Server, error) {
-	if p == nil {
+// 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")
 	}
 
@@ -41,8 +47,18 @@ func ServerFromURL(s string, p Proxy) (Server, error) {
 	scheme := s[:strings.Index(s, ":")]
 	c, ok := serverCreators[strings.ToLower(scheme)]
 	if ok {
-		return c(s, p)
+		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

@@ -11,8 +11,8 @@ import (
 	"net/url"
 	"strconv"
 
-	"github.com/nadoo/glider/log"
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -25,12 +25,14 @@ const (
 
 // SOCKS4 is a base socks4 struct.
 type SOCKS4 struct {
-	dialer proxy.Dialer
-	addr   string
+	dialer  proxy.Dialer
+	addr    string
+	socks4a bool
 }
 
 func init() {
 	proxy.RegisterDialer("socks4", NewSocks4Dialer)
+	proxy.RegisterDialer("socks4a", NewSocks4Dialer)
 }
 
 // NewSOCKS4 returns a socks4 proxy.
@@ -42,8 +44,9 @@ func NewSOCKS4(s string, dialer proxy.Dialer) (*SOCKS4, error) {
 	}
 
 	h := &SOCKS4{
-		dialer: dialer,
-		addr:   u.Host,
+		dialer:  dialer,
+		addr:    u.Host,
+		socks4a: u.Scheme == "socks4a",
 	}
 
 	return h, nil
@@ -85,8 +88,8 @@ func (s *SOCKS4) Dial(network, addr string) (net.Conn, error) {
 }
 
 // DialUDP connects to the given address via the proxy.
-func (s *SOCKS4) DialUDP(network, addr string) (pc net.PacketConn, writeTo net.Addr, err error) {
-	return nil, nil, errors.New("[socks4] DialUDP are not supported by Socks4")
+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) {
@@ -115,27 +118,46 @@ func (s *SOCKS4) connect(conn net.Conn, target string) error {
 		return err
 	}
 
-	port, err := strconv.Atoi(portStr)
+	port, err := strconv.ParseUint(portStr, 10, 16)
 	if err != nil {
 		return errors.New("[socks4] failed to parse port number: " + portStr)
 	}
-	if port < 1 || port > 0xffff {
-		return errors.New("[socks4] port number out of range: " + portStr)
-	}
 
-	ip, err := s.lookupIP(host)
-	if err != nil {
-		return err
+	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
-	buf := []byte{
+	// 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)
@@ -164,3 +186,10 @@ func (s *SOCKS4) connect(conn net.Conn, target string) error {
 
 	return err
 }
+
+func init() {
+	proxy.AddUsage("socks4", `
+Socks4 scheme:
+  socks4://host:port
+`)
+}

proxy/socks5/client.go

@@ -4,14 +4,19 @@ import (
 	"errors"
 	"io"
 	"net"
+	"net/netip"
 	"strconv"
 
-	"github.com/nadoo/glider/log"
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/pkg/socks"
 	"github.com/nadoo/glider/proxy"
-	"github.com/nadoo/glider/proxy/socks"
 )
 
+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)
@@ -27,6 +32,21 @@ func (s *Socks5) Addr() string {
 
 // 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:
@@ -39,84 +59,59 @@ func (s *Socks5) Dial(network, addr string) (net.Conn, error) {
 		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 *Socks5) DialUDP(network, addr string) (pc net.PacketConn, writeTo net.Addr, err error) {
-	c, err := s.dialer.Dial("tcp", s.addr)
+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, nil, err
+		return nil, err
 	}
 
-	// send VER, NMETHODS, METHODS
-	c.Write([]byte{Version, 1, 0})
+	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)
 
-	// read VER METHOD
-	if _, err := io.ReadFull(c, buf[:2]); err != nil {
-		return nil, nil, err
+	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)
 	}
 
-	dstAddr := socks.ParseAddr(addr)
-	// write VER CMD RSV ATYP DST.ADDR DST.PORT
-	c.Write(append([]byte{Version, socks.CmdUDPAssociate, 0}, dstAddr...))
-
-	// read VER REP RSV ATYP BND.ADDR BND.PORT
-	if _, err := io.ReadFull(c, buf[:3]); err != nil {
-		return nil, nil, err
-	}
-
-	rep := buf[1]
-	if rep != 0 {
-		log.F("[socks5] server reply: %d, not succeeded", rep)
-		return nil, nil, errors.New("server connect failed")
-	}
-
-	uAddr, err := socks.ReadAddrBuf(c, buf)
+	pc, err = s.dialer.DialUDP(network, uAddress)
 	if err != nil {
-		return nil, nil, err
+		log.F("[socks5] dialudp to %s error: %s", uAddress, err)
+		return nil, err
 	}
 
-	pc, nextHop, err := s.dialer.DialUDP(network, uAddr.String())
+	writeTo, err := net.ResolveUDPAddr("udp", uAddress)
 	if err != nil {
-		log.F("[socks5] dialudp to %s error: %s", uAddr.String(), err)
-		return nil, nil, err
+		log.F("[socks5] resolve addr error: %s", err)
+		return nil, err
 	}
 
-	pkc := NewPktConn(pc, nextHop, dstAddr, true, c)
-	return pkc, nextHop, 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) error {
-	host, portStr, err := net.SplitHostPort(target)
-	if err != nil {
-		return err
-	}
-
-	port, err := strconv.Atoi(portStr)
-	if err != nil {
-		return errors.New("proxy: failed to parse port number: " + portStr)
-	}
-	if port < 1 || port > 0xffff {
-		return errors.New("proxy: port number out of range: " + portStr)
-	}
-
+func (s *Socks5) connect(conn net.Conn, target string, cmd byte) (addr socks.Addr, err error) {
 	// the size here is just an estimate
-	buf := make([]byte, 0, 6+len(host))
+	buf := pool.GetBuffer(socks.MaxAddrLen)
+	defer pool.PutBuffer(buf)
 
-	buf = append(buf, Version)
+	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 {
@@ -124,17 +119,17 @@ func (s *Socks5) connect(conn net.Conn, target string) error {
 	}
 
 	if _, err := conn.Write(buf); err != nil {
-		return errors.New("proxy: failed to write greeting to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+		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 errors.New("proxy: failed to read greeting from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+		return addr, errors.New("proxy: failed to read greeting from SOCKS5 proxy at " + s.addr + ": " + err.Error())
 	}
 	if buf[0] != Version {
-		return errors.New("proxy: SOCKS5 proxy at " + s.addr + " has unexpected version " + strconv.Itoa(int(buf[0])))
+		return addr, errors.New("proxy: SOCKS5 proxy at " + s.addr + " has unexpected version " + strconv.Itoa(int(buf[0])))
 	}
 	if buf[1] == 0xff {
-		return errors.New("proxy: SOCKS5 proxy at " + s.addr + " requires authentication")
+		return addr, errors.New("proxy: SOCKS5 proxy at " + s.addr + " requires authentication")
 	}
 
 	if buf[1] == socks.AuthPassword {
@@ -146,45 +141,29 @@ func (s *Socks5) connect(conn net.Conn, target string) error {
 		buf = append(buf, s.password...)
 
 		if _, err := conn.Write(buf); err != nil {
-			return errors.New("proxy: failed to write authentication request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+			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 errors.New("proxy: failed to read authentication reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+			return addr, errors.New("proxy: failed to read authentication reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
 		}
 
 		if buf[1] != 0 {
-			return errors.New("proxy: SOCKS5 proxy at " + s.addr + " rejected username/password")
+			return addr, errors.New("proxy: SOCKS5 proxy at " + s.addr + " rejected username/password")
 		}
 	}
 
 	buf = buf[:0]
-	buf = append(buf, Version, socks.CmdConnect, 0 /* reserved */)
-
-	if ip := net.ParseIP(host); ip != nil {
-		if ip4 := ip.To4(); ip4 != nil {
-			buf = append(buf, socks.ATypIP4)
-			ip = ip4
-		} else {
-			buf = append(buf, socks.ATypIP6)
-		}
-		buf = append(buf, ip...)
-	} else {
-		if len(host) > 255 {
-			return errors.New("proxy: destination hostname too long: " + host)
-		}
-		buf = append(buf, socks.ATypDomain)
-		buf = append(buf, byte(len(host)))
-		buf = append(buf, host...)
-	}
-	buf = append(buf, byte(port>>8), byte(port))
+	buf = append(buf, Version, cmd, 0 /* reserved */)
+	buf = append(buf, socks.ParseAddr(target)...)
 
 	if _, err := conn.Write(buf); err != nil {
-		return errors.New("proxy: failed to write connect request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+		return addr, errors.New("proxy: failed to write connect request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
 	}
 
-	if _, err := io.ReadFull(conn, buf[:4]); err != nil {
-		return errors.New("proxy: failed to read connect reply from 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"
@@ -193,38 +172,8 @@ func (s *Socks5) connect(conn net.Conn, target string) error {
 	}
 
 	if len(failure) > 0 {
-		return errors.New("proxy: SOCKS5 proxy at " + s.addr + " failed to connect: " + failure)
+		return addr, errors.New("proxy: SOCKS5 proxy at " + s.addr + " failed to connect: " + failure)
 	}
 
-	bytesToDiscard := 0
-	switch buf[3] {
-	case socks.ATypIP4:
-		bytesToDiscard = net.IPv4len
-	case socks.ATypIP6:
-		bytesToDiscard = net.IPv6len
-	case socks.ATypDomain:
-		_, err := io.ReadFull(conn, buf[:1])
-		if err != nil {
-			return errors.New("proxy: failed to read domain length from SOCKS5 proxy at " + s.addr + ": " + err.Error())
-		}
-		bytesToDiscard = int(buf[0])
-	default:
-		return errors.New("proxy: got unknown address type " + strconv.Itoa(int(buf[3])) + " from SOCKS5 proxy at " + s.addr)
-	}
-
-	if cap(buf) < bytesToDiscard {
-		buf = make([]byte, bytesToDiscard)
-	} else {
-		buf = buf[:bytesToDiscard]
-	}
-	if _, err := io.ReadFull(conn, buf); err != nil {
-		return errors.New("proxy: failed to read address from SOCKS5 proxy at " + s.addr + ": " + err.Error())
-	}
-
-	// Also need to discard the port number
-	if _, err := io.ReadFull(conn, buf[:2]); err != nil {
-		return errors.New("proxy: failed to read port from SOCKS5 proxy at " + s.addr + ": " + err.Error())
-	}
-
-	return nil
+	return socks.ReadAddr(conn)
 }

proxy/socks5/packet.go

@@ -4,29 +4,24 @@ import (
 	"errors"
 	"net"
 
-	"github.com/nadoo/glider/pool"
-	"github.com/nadoo/glider/proxy/socks"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/pkg/socks"
 )
 
 // PktConn .
 type PktConn struct {
 	net.PacketConn
-
-	writeAddr net.Addr // write to and read from addr
-
-	tgtAddr   socks.Addr
-	tgtHeader bool
-
 	ctrlConn net.Conn // tcp control conn
+	writeTo  net.Addr // write to and read from addr
+	target   socks.Addr
 }
 
-// NewPktConn returns a PktConn.
-func NewPktConn(c net.PacketConn, writeAddr net.Addr, tgtAddr socks.Addr, tgtHeader bool, ctrlConn net.Conn) *PktConn {
+// 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,
-		writeAddr:  writeAddr,
-		tgtAddr:    tgtAddr,
-		tgtHeader:  tgtHeader,
+		writeTo:    writeAddr,
+		target:     targetAddr,
 		ctrlConn:   ctrlConn,
 	}
 
@@ -50,23 +45,24 @@ func NewPktConn(c net.PacketConn, writeAddr net.Addr, tgtAddr socks.Addr, tgtHea
 
 // ReadFrom overrides the original function from net.PacketConn.
 func (pc *PktConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	if !pc.tgtHeader {
-		return pc.PacketConn.ReadFrom(b)
-	}
+	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, err
+		return n, raddr, nil, err
 	}
 
 	if n < 3 {
-		return n, raddr, errors.New("not enough size to get addr")
+		return n, raddr, nil, errors.New("not enough size to get addr")
 	}
 
-	// https://tools.ietf.org/html/rfc1928#section-7
+	// https://www.rfc-editor.org/rfc/rfc1928#section-7
 	// +----+------+------+----------+----------+----------+
 	// |RSV | FRAG | ATYP | DST.ADDR | DST.PORT |   DATA   |
 	// +----+------+------+----------+----------+----------+
@@ -74,37 +70,46 @@ func (pc *PktConn) ReadFrom(b []byte) (int, net.Addr, error) {
 	// +----+------+------+----------+----------+----------+
 	tgtAddr := socks.SplitAddr(buf[3:n])
 	if tgtAddr == nil {
-		return n, raddr, errors.New("can not get addr")
+		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])
-
-	//test
-	if pc.writeAddr == nil {
-		pc.writeAddr = raddr
-	}
-
-	if pc.tgtAddr == nil {
-		pc.tgtAddr = tgtAddr
-	}
-
-	return n, raddr, err
+	return n, raddr, target, err
 }
 
 // WriteTo overrides the original function from net.PacketConn.
 func (pc *PktConn) WriteTo(b []byte, addr net.Addr) (int, error) {
-	if !pc.tgtHeader {
-		return pc.PacketConn.WriteTo(b, addr)
+	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(pc.tgtAddr)
+	tgtLen, _ := buf.Write(target)
 	buf.Write(b)
 
-	n, err := pc.PacketConn.WriteTo(buf.Bytes(), pc.writeAddr)
+	n, err := pc.PacketConn.WriteTo(buf.Bytes(), pc.writeTo)
 	if n > tgtLen+3 {
 		return n - tgtLen - 3, err
 	}

proxy/socks5/server.go

@@ -8,12 +8,18 @@ import (
 	"sync"
 	"time"
 
-	"github.com/nadoo/glider/log"
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/pkg/socks"
 	"github.com/nadoo/glider/proxy"
-	"github.com/nadoo/glider/proxy/socks"
 )
 
+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)
@@ -29,7 +35,7 @@ func (s *Socks5) ListenAndServe() {
 func (s *Socks5) ListenAndServeTCP() {
 	l, err := net.Listen("tcp", s.addr)
 	if err != nil {
-		log.F("[socks5] failed to listen on %s: %v", s.addr, err)
+		log.Fatalf("[socks5] failed to listen on %s: %v", s.addr, err)
 		return
 	}
 
@@ -97,87 +103,119 @@ func (s *Socks5) Serve(c net.Conn) {
 func (s *Socks5) ListenAndServeUDP() {
 	lc, err := net.ListenPacket("udp", s.addr)
 	if err != nil {
-		log.F("[socks5] failed to listen on UDP %s: %v", s.addr, err)
+		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)
 
-	var nm sync.Map
-	buf := make([]byte, proxy.UDPBufSize)
+	s.ServePacket(lc)
+}
 
+// ServePacket implements proxy.PacketServer.
+func (s *Socks5) ServePacket(pc net.PacketConn) {
 	for {
-		c := NewPktConn(lc, nil, nil, true, nil)
+		c := NewPktConn(pc, nil, nil, nil)
+		buf := pool.GetBuffer(proxy.UDPBufSize)
 
-		n, raddr, err := c.ReadFrom(buf)
+		n, srcAddr, dstAddr, err := c.readFrom(buf)
 		if err != nil {
 			log.F("[socks5u] remote read error: %v", err)
 			continue
 		}
 
-		var pc *PktConn
-		v, ok := nm.Load(raddr.String())
-		if !ok && v == nil {
-			if c.tgtAddr == nil {
-				log.F("[socks5u] can not get target address, not a valid request")
-				continue
-			}
-
-			lpc, nextHop, err := s.proxy.DialUDP("udp", c.tgtAddr.String())
-			if err != nil {
-				log.F("[socks5u] remote dial error: %v", err)
-				continue
-			}
-
-			pc = NewPktConn(lpc, nextHop, nil, false, nil)
-			nm.Store(raddr.String(), pc)
-
-			go func() {
-				proxy.RelayUDP(c, raddr, pc, 2*time.Minute)
-				pc.Close()
-				nm.Delete(raddr.String())
-			}()
-
-			log.F("[socks5u] %s <-> %s via %s", raddr, c.tgtAddr, nextHop)
+		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 {
-			pc = v.(*PktConn)
+			session = v.(*Session)
 		}
 
-		_, err = pc.WriteTo(buf[:n], pc.writeAddr)
-		if err != nil {
-			log.F("[socks5u] remote write error: %v", err)
-			continue
-		}
-
-		// log.F("[socks5u] %s <-> %s", raddr, c.tgtAddr)
+		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(rw io.ReadWriter) (socks.Addr, error) {
+func (s *Socks5) handshake(c net.Conn) (socks.Addr, error) {
 	// Read RFC 1928 for request and reply structure and sizes
-	buf := make([]byte, socks.MaxAddrLen)
+	buf := pool.GetBuffer(socks.MaxAddrLen)
+	defer pool.PutBuffer(buf)
+
 	// read VER, NMETHODS, METHODS
-	if _, err := io.ReadFull(rw, buf[:2]); err != nil {
+	if _, err := io.ReadFull(c, buf[:2]); err != nil {
 		return nil, err
 	}
 
 	nmethods := buf[1]
-	if _, err := io.ReadFull(rw, buf[:nmethods]); err != nil {
+	if _, err := io.ReadFull(c, buf[:nmethods]); err != nil {
 		return nil, err
 	}
 
 	// write VER METHOD
 	if s.user != "" && s.password != "" {
-		_, err := rw.Write([]byte{Version, socks.AuthPassword})
+		_, err := c.Write([]byte{Version, socks.AuthPassword})
 		if err != nil {
 			return nil, err
 		}
 
-		_, err = io.ReadFull(rw, buf[:2])
+		_, err = io.ReadFull(c, buf[:2])
 		if err != nil {
 			return nil, err
 		}
@@ -185,28 +223,28 @@ func (s *Socks5) handshake(rw io.ReadWriter) (socks.Addr, error) {
 		// Get username
 		userLen := int(buf[1])
 		if userLen <= 0 {
-			rw.Write([]byte{1, 1})
+			c.Write([]byte{1, 1})
 			return nil, errors.New("auth failed: wrong username length")
 		}
 
-		if _, err := io.ReadFull(rw, buf[:userLen]); err != nil {
+		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 = rw.Read(buf[:1])
+		_, 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 {
-			rw.Write([]byte{1, 1})
+			c.Write([]byte{1, 1})
 			return nil, errors.New("auth failed: wrong password length")
 		}
 
-		_, err = io.ReadFull(rw, buf[:passLen])
+		_, err = io.ReadFull(c, buf[:passLen])
 		if err != nil {
 			return nil, errors.New("auth failed: cannot get password")
 		}
@@ -214,7 +252,7 @@ func (s *Socks5) handshake(rw io.ReadWriter) (socks.Addr, error) {
 
 		// Verify
 		if user != s.user || pass != s.password {
-			_, err = rw.Write([]byte{1, 1})
+			_, err = c.Write([]byte{1, 1})
 			if err != nil {
 				return nil, err
 			}
@@ -222,30 +260,33 @@ func (s *Socks5) handshake(rw io.ReadWriter) (socks.Addr, error) {
 		}
 
 		// Response auth state
-		_, err = rw.Write([]byte{1, 0})
+		_, err = c.Write([]byte{1, 0})
 		if err != nil {
 			return nil, err
 		}
 
-	} else if _, err := rw.Write([]byte{Version, socks.AuthNone}); err != nil {
+	} 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(rw, buf[:3]); err != nil {
+	if _, err := io.ReadFull(c, buf[:3]); err != nil {
 		return nil, err
 	}
 	cmd := buf[1]
-	addr, err := socks.ReadAddrBuf(rw, buf)
+	addr, err := socks.ReadAddr(c)
 	if err != nil {
 		return nil, err
 	}
 	switch cmd {
 	case socks.CmdConnect:
-		_, err = rw.Write([]byte{5, 0, 0, 1, 0, 0, 0, 0, 0, 0}) // SOCKS v5, reply succeeded
+		_, err = c.Write([]byte{5, 0, 0, 1, 0, 0, 0, 0, 0, 0}) // SOCKS v5, reply succeeded
 	case socks.CmdUDPAssociate:
-		listenAddr := socks.ParseAddr(rw.(net.Conn).LocalAddr().String())
-		_, err = rw.Write(append([]byte{5, 0, 0}, listenAddr...)) // SOCKS v5, reply succeeded
+		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]
 		}

proxy/socks5/socks5.go

@@ -1,4 +1,4 @@
-// https://tools.ietf.org/html/rfc1928
+// https://www.rfc-editor.org/rfc/rfc1928
 
 // socks5 client:
 // https://github.com/golang/net/tree/master/proxy
@@ -12,7 +12,7 @@ package socks5
 import (
 	"net/url"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -28,11 +28,6 @@ type Socks5 struct {
 	password string
 }
 
-func init() {
-	proxy.RegisterDialer("socks5", NewSocks5Dialer)
-	proxy.RegisterServer("socks5", NewSocks5Server)
-}
-
 // 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) {
@@ -56,3 +51,10 @@ func NewSocks5(s string, d proxy.Dialer, p proxy.Proxy) (*Socks5, error) {
 
 	return h, nil
 }
+
+func init() {
+	proxy.AddUsage("socks5", `
+Socks5 scheme:
+  socks5://[user:pass@]host:port
+`)
+}

proxy/ss/cipher/cipher.go

@@ -6,8 +6,8 @@ import (
 	"net"
 	"strings"
 
-	"github.com/nadoo/glider/proxy/ss/cipher/internal/shadowaead"
-	"github.com/nadoo/glider/proxy/ss/cipher/internal/shadowstream"
+	"github.com/nadoo/glider/proxy/ss/cipher/shadowaead"
+	"github.com/nadoo/glider/proxy/ss/cipher/shadowstream"
 )
 
 // Cipher interface.
@@ -21,7 +21,7 @@ type StreamConnCipher interface {
 	StreamConn(net.Conn) net.Conn
 }
 
-// StreamConnCipher is the packet connection cipher.
+// PacketConnCipher is the packet connection cipher.
 type PacketConnCipher interface {
 	PacketConn(net.PacketConn) net.PacketConn
 }

proxy/ss/cipher/shadowaead/stream.go

@@ -10,7 +10,7 @@ import (
 	"encoding/binary"
 	"io"
 
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/pool"
 )
 
 const (
@@ -25,7 +25,6 @@ type writer struct {
 	io.Writer
 	cipher.AEAD
 	nonce [32]byte
-	buf   []byte
 }
 
 // NewWriter wraps an io.Writer with AEAD encryption.

proxy/ss/cipher/shadowstream/stream.go

@@ -4,7 +4,7 @@ import (
 	"crypto/cipher"
 	"io"
 
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/pool"
 )
 
 const bufSize = 32 * 1024

proxy/ss/client.go

@@ -4,9 +4,9 @@ import (
 	"errors"
 	"net"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/socks"
 	"github.com/nadoo/glider/proxy"
-	"github.com/nadoo/glider/proxy/socks"
 )
 
 // NewSSDialer returns a ss proxy dialer.
@@ -45,13 +45,19 @@ func (s *SS) Dial(network, addr string) (net.Conn, error) {
 }
 
 // DialUDP connects to the given address via the proxy.
-func (s *SS) DialUDP(network, addr string) (net.PacketConn, net.Addr, error) {
-	pc, nextHop, err := s.dialer.DialUDP(network, s.addr)
+func (s *SS) DialUDP(network, addr string) (net.PacketConn, error) {
+	pc, err := s.dialer.DialUDP(network, s.addr)
 	if err != nil {
 		log.F("[ss] dialudp to %s error: %s", s.addr, err)
-		return nil, nil, err
+		return nil, err
 	}
 
-	pkc := NewPktConn(s.PacketConn(pc), nextHop, socks.ParseAddr(addr), true)
-	return pkc, nextHop, err
+	writeTo, err := net.ResolveUDPAddr("udp", s.addr)
+	if err != nil {
+		log.F("[ss] resolve addr error: %s", err)
+		return nil, err
+	}
+
+	pkc := NewPktConn(s.PacketConn(pc), writeTo, socks.ParseAddr(addr))
+	return pkc, nil
 }

proxy/ss/packet.go

@@ -4,76 +4,78 @@ import (
 	"errors"
 	"net"
 
-	"github.com/nadoo/glider/pool"
-	"github.com/nadoo/glider/proxy/socks"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/pkg/socks"
 )
 
 // PktConn .
 type PktConn struct {
 	net.PacketConn
-
-	writeAddr net.Addr // write to and read from addr
-
-	tgtAddr   socks.Addr
-	tgtHeader bool
+	writeTo net.Addr
+	target  socks.Addr // if target is not nil, it may be a tunnel
 }
 
-// NewPktConn returns a PktConn
-func NewPktConn(c net.PacketConn, writeAddr net.Addr, tgtAddr socks.Addr, tgtHeader bool) *PktConn {
-	pc := &PktConn{
-		PacketConn: c,
-		writeAddr:  writeAddr,
-		tgtAddr:    tgtAddr,
-		tgtHeader:  tgtHeader}
-	return pc
+// NewPktConn returns a PktConn, the writeAddr must be *net.UDPAddr or *net.UnixAddr.
+func NewPktConn(c net.PacketConn, writeAddr net.Addr, targetAddr socks.Addr) *PktConn {
+	return &PktConn{PacketConn: c, writeTo: writeAddr, target: targetAddr}
 }
 
-// ReadFrom overrides the original function from net.PacketConn
+// ReadFrom overrides the original function from net.PacketConn.
 func (pc *PktConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	if !pc.tgtHeader {
-		return pc.PacketConn.ReadFrom(b)
-	}
+	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, err
+		return n, raddr, nil, err
 	}
 
 	tgtAddr := socks.SplitAddr(buf[:n])
 	if tgtAddr == nil {
-		return n, raddr, errors.New("can not get addr")
+		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[len(tgtAddr):n])
-
-	//test
-	if pc.writeAddr == nil {
-		pc.writeAddr = raddr
-	}
-
-	if pc.tgtAddr == nil {
-		pc.tgtAddr = tgtAddr
-	}
-
-	return n, raddr, err
+	return n, raddr, target, err
 }
 
 // WriteTo overrides the original function from net.PacketConn
 func (pc *PktConn) WriteTo(b []byte, addr net.Addr) (int, error) {
-	if !pc.tgtHeader {
-		return pc.PacketConn.WriteTo(b, addr)
+	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)
 
-	tgtLen, _ := buf.Write(pc.tgtAddr)
+	tgtLen, _ := buf.Write(target)
 	buf.Write(b)
 
-	n, err := pc.PacketConn.WriteTo(buf.Bytes(), pc.writeAddr)
+	n, err := pc.PacketConn.WriteTo(buf.Bytes(), pc.writeTo)
 	if n > tgtLen {
 		return n - tgtLen, err
 	}

proxy/ss/server.go

@@ -1,16 +1,20 @@
 package ss
 
 import (
+	"io"
 	"net"
 	"strings"
 	"sync"
 	"time"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
+	"github.com/nadoo/glider/pkg/pool"
+	"github.com/nadoo/glider/pkg/socks"
 	"github.com/nadoo/glider/proxy"
-	"github.com/nadoo/glider/proxy/socks"
 )
 
+var nm sync.Map
+
 // NewSSServer returns a ss proxy server.
 func NewSSServer(s string, p proxy.Proxy) (proxy.Server, error) {
 	return NewSS(s, nil, p)
@@ -26,7 +30,7 @@ func (s *SS) ListenAndServe() {
 func (s *SS) ListenAndServeTCP() {
 	l, err := net.Listen("tcp", s.addr)
 	if err != nil {
-		log.F("[ss] failed to listen on %s: %v", s.addr, err)
+		log.Fatalf("[ss] failed to listen on %s: %v", s.addr, err)
 		return
 	}
 
@@ -51,18 +55,17 @@ func (s *SS) Serve(c net.Conn) {
 		c.SetKeepAlive(true)
 	}
 
-	c = s.StreamConn(c)
+	sc := s.StreamConn(c)
 
-	tgt, err := socks.ReadAddr(c)
+	tgt, err := socks.ReadAddr(sc)
 	if err != nil {
-		log.F("[ss] failed to get target address: %v", err)
+		log.F("[ss] %s <-> target error: %v", c.RemoteAddr(), err)
+		proxy.Copy(io.Discard, c) // https://github.com/nadoo/glider/issues/180
 		return
 	}
 
-	network := "tcp"
 	dialer := s.proxy.NextDialer(tgt.String())
-
-	rc, err := dialer.Dial(network, tgt.String())
+	rc, err := dialer.Dial("tcp", tgt.String())
 	if err != nil {
 		log.F("[ss] %s <-> %s via %s, error in dial: %v", c.RemoteAddr(), tgt, dialer.Addr(), err)
 		return
@@ -71,7 +74,7 @@ func (s *SS) Serve(c net.Conn) {
 
 	log.F("[ss] %s <-> %s via %s", c.RemoteAddr(), tgt, dialer.Addr())
 
-	if err = proxy.Relay(c, rc); err != nil {
+	if err = proxy.Relay(sc, rc); err != nil {
 		log.F("[ss] %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) {
@@ -80,61 +83,96 @@ func (s *SS) Serve(c net.Conn) {
 	}
 }
 
-// ListenAndServeUDP serves udp ss requests.
+// ListenAndServeUDP serves udp requests.
 func (s *SS) ListenAndServeUDP() {
 	lc, err := net.ListenPacket("udp", s.addr)
 	if err != nil {
-		log.F("[ss] failed to listen on UDP %s: %v", s.addr, err)
+		log.Fatalf("[ss] failed to listen on UDP %s: %v", s.addr, err)
 		return
 	}
 	defer lc.Close()
 
-	lc = s.PacketConn(lc)
-
 	log.F("[ss] listening UDP on %s", s.addr)
 
-	var nm sync.Map
-	buf := make([]byte, proxy.UDPBufSize)
+	s.ServePacket(lc)
+}
 
+// ServePacket implements proxy.PacketServer.
+func (s *SS) ServePacket(pc net.PacketConn) {
+	lc := s.PacketConn(pc)
 	for {
-		c := NewPktConn(lc, nil, nil, true)
+		c := NewPktConn(lc, nil, nil)
+		buf := pool.GetBuffer(proxy.UDPBufSize)
 
-		n, raddr, err := c.ReadFrom(buf)
+		n, srcAddr, dstAddr, err := c.readFrom(buf)
 		if err != nil {
 			log.F("[ssu] remote read error: %v", err)
 			continue
 		}
 
-		var pc *PktConn
-		v, ok := nm.Load(raddr.String())
-		if !ok && v == nil {
-			lpc, nextHop, err := s.proxy.DialUDP("udp", c.tgtAddr.String())
-			if err != nil {
-				log.F("[ssu] remote dial error: %v", err)
-				continue
-			}
-
-			pc = NewPktConn(lpc, nextHop, nil, false)
-			nm.Store(raddr.String(), pc)
-
-			go func() {
-				proxy.RelayUDP(c, raddr, pc, 2*time.Minute)
-				pc.Close()
-				nm.Delete(raddr.String())
-			}()
-
-			log.F("[ssu] %s <-> %s via %s", raddr, c.tgtAddr, nextHop)
+		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 {
-			pc = v.(*PktConn)
+			session = v.(*Session)
 		}
 
-		_, err = pc.WriteTo(buf[:n], pc.writeAddr)
-		if err != nil {
-			log.F("[ssu] remote write error: %v", err)
-			continue
-		}
-
-		// log.F("[ssu] %s <-> %s", raddr, c.tgtAddr)
+		session.msgCh <- message{dstAddr, buf[:n]}
 	}
 }
+
+func (s *SS) serveSession(session *Session) {
+	dstPC, dialer, err := s.proxy.DialUDP("udp", session.dst.String())
+	if err != nil {
+		log.F("[ssu] 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("[ssu] %s <-> %s via %s", session.src, session.dst, dialer.Addr())
+
+	for {
+		select {
+		case msg := <-session.msgCh:
+			_, err = dstPC.WriteTo(msg.msg, msg.dst)
+			if err != nil {
+				log.F("[ssu] 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{})}
+}

proxy/ss/ss.go

@@ -3,7 +3,7 @@ package ss
 import (
 	"net/url"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
 	"github.com/nadoo/glider/proxy"
 	"github.com/nadoo/glider/proxy/ss/cipher"
 )
@@ -48,3 +48,19 @@ func NewSS(s string, d proxy.Dialer, p proxy.Proxy) (*SS, error) {
 
 	return ss, nil
 }
+
+func init() {
+	proxy.AddUsage("ss", `
+SS scheme:
+  ss://method:pass@host:port
+  
+  Available methods for ss:
+    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
+`)
+}

proxy/ssh/ssh.go

@@ -2,14 +2,16 @@ package ssh
 
 import (
 	"errors"
-	"io/ioutil"
 	"net"
 	"net/url"
+	"os"
+	"strconv"
+	"sync"
 	"time"
 
 	"golang.org/x/crypto/ssh"
 
-	"github.com/nadoo/glider/log"
+	"github.com/nadoo/glider/pkg/log"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -18,7 +20,13 @@ type SSH struct {
 	dialer proxy.Dialer
 	proxy  proxy.Proxy
 	addr   string
+
+	conn   net.Conn
+	client *ssh.Client
 	config *ssh.ClientConfig
+
+	once  sync.Once
+	mutex sync.RWMutex
 }
 
 func init() {
@@ -29,7 +37,7 @@ func init() {
 func NewSSH(s string, d proxy.Dialer, p proxy.Proxy) (*SSH, error) {
 	u, err := url.Parse(s)
 	if err != nil {
-		log.F("parse err: %s", err)
+		log.F("[ssh] parse err: %s", err)
 		return nil, err
 	}
 
@@ -39,18 +47,16 @@ func NewSSH(s string, d proxy.Dialer, p proxy.Proxy) (*SSH, error) {
 	}
 
 	config := &ssh.ClientConfig{
-		User:    user,
-		Timeout: time.Second * 3,
-		HostKeyCallback: func(hostname string, remote net.Addr, key ssh.PublicKey) error {
-			return nil
-		},
+		User:            user,
+		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
 	}
 
 	if pass, _ := u.User.Password(); pass != "" {
 		config.Auth = []ssh.AuthMethod{ssh.Password(pass)}
 	}
 
-	if key := u.Query().Get("key"); key != "" {
+	query := u.Query()
+	if key := query.Get("key"); key != "" {
 		keyAuth, err := privateKeyAuth(key)
 		if err != nil {
 			log.F("[ssh] read key file error: %s", err)
@@ -59,14 +65,30 @@ func NewSSH(s string, d proxy.Dialer, p proxy.Proxy) (*SSH, error) {
 		config.Auth = append(config.Auth, keyAuth)
 	}
 
-	ssh := &SSH{
+	// timeout of ssh handshake and channel operation
+	qtimeout := query.Get("timeout")
+	if qtimeout == "" {
+		qtimeout = "5" // default timeout
+	}
+	timeout, err := strconv.ParseUint(qtimeout, 10, 32)
+	if err != nil {
+		log.F("[ssh] parse timeout err: %s", err)
+		return nil, err
+	}
+	config.Timeout = time.Second * time.Duration(timeout)
+
+	t := &SSH{
 		dialer: d,
 		proxy:  p,
 		addr:   u.Host,
 		config: config,
 	}
 
-	return ssh, nil
+	if _, port, _ := net.SplitHostPort(t.addr); port == "" {
+		t.addr = net.JoinHostPort(t.addr, "22")
+	}
+
+	return t, nil
 }
 
 // NewSSHDialer returns a ssh proxy dialer.
@@ -84,28 +106,78 @@ func (s *SSH) Addr() string {
 
 // Dial connects to the address addr on the network net via the proxy.
 func (s *SSH) Dial(network, addr string) (net.Conn, error) {
-	c, err := s.dialer.Dial(network, s.addr)
+	s.once.Do(func() { go s.keepConn(s.initConn() == nil) })
+
+	s.mutex.RLock()
+	defer s.mutex.RUnlock()
+
+	if s.client == nil {
+		return nil, errors.New("ssh client is nil")
+	}
+	return s.dial(network, addr)
+}
+
+func (s *SSH) dial(network, addr string) (net.Conn, error) {
+	s.conn.SetDeadline(time.Now().Add(s.config.Timeout))
+	c, err := s.client.Dial(network, addr)
+	s.conn.SetDeadline(time.Time{})
+	return c, err
+}
+
+func (s *SSH) initConn() error {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	log.F("[ssh] connecting to %s", s.addr)
+	c, err := s.dialer.Dial("tcp", s.addr)
 	if err != nil {
-		log.F("[ssh]: dial to %s error: %s", s.addr, err)
-		return nil, err
+		log.F("[ssh] dial connection to %s error: %s", s.addr, err)
+		return err
 	}
 
-	sshc, ch, req, err := ssh.NewClientConn(c, s.addr, s.config)
+	c.SetDeadline(time.Now().Add(s.config.Timeout))
+	conn, ch, req, err := ssh.NewClientConn(c, s.addr, s.config)
 	if err != nil {
-		log.F("[ssh]: initial connection to %s error: %s", s.addr, err)
-		return nil, err
+		log.F("[ssh] initial connection to %s error: %s", s.addr, err)
+		c.Close()
+		return err
+	}
+	c.SetDeadline(time.Time{})
+
+	s.conn = c
+	s.client = ssh.NewClient(conn, ch, req)
+	return nil
+}
+
+func (s *SSH) keepConn(connected bool) {
+	if connected {
+		s.client.Conn.Wait()
+		s.conn.Close()
 	}
 
-	return ssh.NewClient(sshc, ch, req).Dial(network, addr)
+	sleep := time.Second
+	for {
+		if err := s.initConn(); err != nil {
+			sleep *= 2
+			if sleep > time.Second*60 {
+				sleep = time.Second * 60
+			}
+			time.Sleep(sleep)
+			continue
+		}
+		sleep = time.Second
+		s.client.Conn.Wait()
+		s.conn.Close()
+	}
 }
 
 // DialUDP connects to the given address via the proxy.
-func (s *SSH) DialUDP(network, addr string) (pc net.PacketConn, writeTo net.Addr, err error) {
-	return nil, nil, errors.New("ssh client does not support udp")
+func (s *SSH) DialUDP(network, addr string) (pc net.PacketConn, err error) {
+	return nil, proxy.ErrNotSupported
 }
 
 func privateKeyAuth(file string) (ssh.AuthMethod, error) {
-	buffer, err := ioutil.ReadFile(file)
+	buffer, err := os.ReadFile(file)
 	if err != nil {
 		return nil, err
 	}
@@ -117,3 +189,11 @@ func privateKeyAuth(file string) (ssh.AuthMethod, error) {
 
 	return ssh.PublicKeys(key), nil
 }
+
+func init() {
+	proxy.AddUsage("ssh", `
+SSH scheme:
+  ssh://user[:pass]@host:port[?key=keypath&timeout=SECONDS]
+    timeout: timeout of ssh handshake and channel operation, default: 5
+`)
+}

proxy/ssr/internal/cipher/cipher.go

@@ -5,10 +5,10 @@ import (
 	"crypto/cipher"
 	"crypto/des"
 	"crypto/md5"
+	"crypto/rand"
 	"crypto/rc4"
 	"encoding/binary"
 	"errors"
-	"math/rand"
 
 	"github.com/aead/chacha20"
 	"github.com/dgryski/go-camellia"
@@ -18,7 +18,7 @@ import (
 	"golang.org/x/crypto/cast5"
 	"golang.org/x/crypto/salsa20/salsa"
 
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/pool"
 	"github.com/nadoo/glider/proxy/ssr/internal/tools"
 )
 

proxy/ssr/internal/client.go

@@ -8,22 +8,16 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"math/rand"
 	"net"
-	"time"
 
-	"github.com/nadoo/glider/pool"
+	"github.com/nadoo/glider/pkg/pool"
 	"github.com/nadoo/glider/proxy"
 	"github.com/nadoo/glider/proxy/ssr/internal/cipher"
 	"github.com/nadoo/glider/proxy/ssr/internal/obfs"
 	"github.com/nadoo/glider/proxy/ssr/internal/protocol"
 )
 
-const bufSize = proxy.TCPBufSize
-
-func init() {
-	rand.Seed(time.Now().UnixNano())
-}
+var bufSize = proxy.TCPBufSize
 
 // SSTCPConn the struct that override the net.Conn methods
 type SSTCPConn struct {

proxy/ssr/internal/obfs/base.go

@@ -17,8 +17,8 @@ type IObfs interface {
 	GetServerInfo() (s *ssr.ServerInfo)
 	Encode(data []byte) (encodedData []byte, err error)
 	Decode(data []byte) (decodedData []byte, needSendBack bool, err error)
-	SetData(data interface{})
-	GetData() interface{}
+	SetData(data any)
+	GetData() any
 	GetOverhead() int
 }
 

proxy/ssr/internal/obfs/http_post.go

@@ -1,7 +1,7 @@
 package obfs
 
 import (
-	"math/rand"
+	"math/rand/v2"
 )
 
 func init() {
@@ -13,7 +13,7 @@ func newHttpPost() IObfs {
 	// newHttpSimple create a http_simple object
 
 	t := &httpSimplePost{
-		userAgentIndex: rand.Intn(len(requestUserAgent)),
+		userAgentIndex: rand.IntN(len(requestUserAgent)),
 		methodGet:      false,
 	}
 	return t

proxy/ssr/internal/obfs/http_simple.go

@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/hex"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"strings"
 
 	"github.com/nadoo/glider/proxy/ssr/internal/ssr"
@@ -55,7 +55,7 @@ func newHttpSimple() IObfs {
 	t := &httpSimplePost{
 		rawTransSent:     false,
 		rawTransReceived: false,
-		userAgentIndex:   rand.Intn(len(requestUserAgent)),
+		userAgentIndex:   rand.IntN(len(requestUserAgent)),
 		methodGet:        true,
 	}
 	return t
@@ -69,25 +69,25 @@ func (t *httpSimplePost) GetServerInfo() (s *ssr.ServerInfo) {
 	return &t.ServerInfo
 }
 
-func (t *httpSimplePost) SetData(data interface{}) {
+func (t *httpSimplePost) SetData(data any) {
 
 }
 
-func (t *httpSimplePost) GetData() interface{} {
+func (t *httpSimplePost) GetData() any {
 	return nil
 }
 
 func (t *httpSimplePost) boundary() (ret string) {
 
 	set := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
-	for i := 0; i < 32; i++ {
-		ret = fmt.Sprintf("%s%c", ret, set[rand.Intn(len(set))])
+	for range 32 {
+		ret = fmt.Sprintf("%s%c", ret, set[rand.IntN(len(set))])
 	}
 	return
 }
 
 func (t *httpSimplePost) data2URLEncode(data []byte) (ret string) {
-	for i := 0; i < len(data); i++ {
+	for i := range data {
 		ret = fmt.Sprintf("%s%%%s", ret, hex.EncodeToString([]byte{data[i]}))
 	}
 	return
@@ -101,12 +101,12 @@ func (t *httpSimplePost) Encode(data []byte) (encodedData []byte, err error) {
 	dataLength := len(data)
 	var headData []byte
 	if headSize := t.IVLen + t.HeadLen; dataLength-headSize > 64 {
-		headData = make([]byte, headSize+rand.Intn(64))
+		headData = make([]byte, headSize+rand.IntN(64))
 	} else {
 		headData = make([]byte, dataLength)
 	}
 	copy(headData, data[0:len(headData)])
-	requestPathIndex := rand.Intn(len(requestPath)/2) * 2
+	requestPathIndex := rand.IntN(len(requestPath)/2) * 2
 	host := t.Host
 	var customHead string
 
@@ -122,7 +122,7 @@ func (t *httpSimplePost) Encode(data []byte) (encodedData []byte, err error) {
 		}
 		hosts := strings.Split(param, ",")
 		if len(hosts) > 0 {
-			host = strings.TrimSpace(hosts[rand.Intn(len(hosts))])
+			host = strings.TrimSpace(hosts[rand.IntN(len(hosts))])
 		}
 	}
 	method := "GET /"

proxy/ssr/internal/obfs/plain.go

@@ -33,11 +33,11 @@ func (p *plain) Decode(data []byte) (decodedData []byte, needSendBack bool, err
 	return data, false, nil
 }
 
-func (p *plain) SetData(data interface{}) {
+func (p *plain) SetData(data any) {
 
 }
 
-func (p *plain) GetData() interface{} {
+func (p *plain) GetData() any {
 	return nil
 }
 

proxy/ssr/internal/obfs/random_head.go

@@ -1,7 +1,8 @@
 package obfs
 
 import (
-	"math/rand"
+	crand "crypto/rand"
+	"math/rand/v2"
 
 	"github.com/nadoo/glider/proxy/ssr/internal/ssr"
 )
@@ -31,11 +32,11 @@ func (r *randomHead) GetServerInfo() (s *ssr.ServerInfo) {
 	return &r.ServerInfo
 }
 
-func (r *randomHead) SetData(data interface{}) {
+func (r *randomHead) SetData(data any) {
 
 }
 
-func (r *randomHead) GetData() interface{} {
+func (r *randomHead) GetData() any {
 	return nil
 }
 
@@ -57,9 +58,9 @@ func (r *randomHead) Encode(data []byte) (encodedData []byte, err error) {
 			r.rawTransSent = true
 		}
 	} else {
-		size := rand.Intn(96) + 8
+		size := rand.IntN(96) + 8
 		encodedData = make([]byte, size)
-		rand.Read(encodedData)
+		crand.Read(encodedData)
 		ssr.SetCRC32(encodedData, size)
 
 		d := make([]byte, dataLength)

proxy/ssr/internal/obfs/tls12_ticket_auth.go

@@ -3,10 +3,11 @@ package obfs
 import (
 	"bytes"
 	"crypto/hmac"
+	crand "crypto/rand"
 	"encoding/binary"
 	"fmt"
 	"log"
-	"math/rand"
+	"math/rand/v2"
 	"strings"
 	"time"
 
@@ -53,18 +54,18 @@ func (t *tls12TicketAuth) GetServerInfo() (s *ssr.ServerInfo) {
 	return &t.ServerInfo
 }
 
-func (t *tls12TicketAuth) SetData(data interface{}) {
+func (t *tls12TicketAuth) SetData(data any) {
 	if auth, ok := data.(*tlsAuthData); ok {
 		t.data = auth
 	}
 }
 
-func (t *tls12TicketAuth) GetData() interface{} {
+func (t *tls12TicketAuth) GetData() any {
 	if t.data == nil {
 		t.data = &tlsAuthData{}
 		b := make([]byte, 32)
 
-		rand.Read(b)
+		crand.Read(b)
 		copy(t.data.localClientID[:], b)
 	}
 	return t.data
@@ -76,7 +77,7 @@ func (t *tls12TicketAuth) getHost() string {
 		hosts := strings.Split(t.Param, ",")
 		if len(hosts) > 0 {
 
-			host = hosts[rand.Intn(len(hosts))]
+			host = hosts[rand.IntN(len(hosts))]
 			host = strings.TrimSpace(host)
 		}
 	}
@@ -96,7 +97,6 @@ func packData(prefixData []byte, suffixData []byte) (outData []byte) {
 
 func (t *tls12TicketAuth) Encode(data []byte) (encodedData []byte, err error) {
 	encodedData = make([]byte, 0)
-	rand.Seed(time.Now().UnixNano())
 	switch t.handshakeStatus {
 	case 8:
 		if len(data) < 1024 {
@@ -108,7 +108,7 @@ func (t *tls12TicketAuth) Encode(data []byte) (encodedData []byte, err error) {
 			start := 0
 			var l int
 			for len(data)-start > 2048 {
-				l = rand.Intn(4096) + 100
+				l = rand.IntN(4096) + 100
 				if l > len(data)-start {
 					l = len(data) - start
 				}
@@ -129,7 +129,7 @@ func (t *tls12TicketAuth) Encode(data []byte) (encodedData []byte, err error) {
 				start := 0
 				var l int
 				for len(data)-start > 2048 {
-					l = rand.Intn(4096) + 100
+					l = rand.IntN(4096) + 100
 					if l > len(data)-start {
 						l = len(data) - start
 					}
@@ -148,7 +148,7 @@ func (t *tls12TicketAuth) Encode(data []byte) (encodedData []byte, err error) {
 		hmacData := make([]byte, 43)
 		handshakeFinish := []byte("\x14\x03\x03\x00\x01\x01\x16\x03\x03\x00\x20")
 		copy(hmacData, handshakeFinish)
-		rand.Read(hmacData[11:33])
+		crand.Read(hmacData[11:33])
 		h := t.hmacSHA1(hmacData[:33])
 		copy(hmacData[33:], h)
 		encodedData = append(hmacData, t.sendSaver...)
@@ -169,11 +169,11 @@ func (t *tls12TicketAuth) Encode(data []byte) (encodedData []byte, err error) {
 		tlsDataLen += len(sni)
 		copy(tlsData[tlsDataLen:], tlsData2)
 		tlsDataLen += len(tlsData2)
-		ticketLen := rand.Intn(164)*2 + 64
+		ticketLen := rand.IntN(164)*2 + 64
 		tlsData[tlsDataLen-1] = uint8(ticketLen & 0xff)
 		tlsData[tlsDataLen-2] = uint8(ticketLen >> 8)
 		//ticketLen := 208
-		rand.Read(tlsData[tlsDataLen : tlsDataLen+ticketLen])
+		crand.Read(tlsData[tlsDataLen : tlsDataLen+ticketLen])
 		tlsDataLen += ticketLen
 		copy(tlsData[tlsDataLen:], tlsData3)
 		tlsDataLen += len(tlsData3)
@@ -212,11 +212,11 @@ func (t *tls12TicketAuth) Encode(data []byte) (encodedData []byte, err error) {
 		encodedData[pdata-1] = uint8(l)
 		encodedData[pdata-2] = uint8(l >> 8)
 		pdata -= 2
-		l += 2
+		// l += 2
 		encodedData[pdata-1] = 0x1
 		encodedData[pdata-2] = 0x3 // tls version
 		pdata -= 2
-		l += 2
+		// l += 2
 		encodedData[pdata-1] = 0x16 // tls handshake
 		// pdata -= 1
 		// l += 1
@@ -278,7 +278,7 @@ func (t *tls12TicketAuth) packAuthData() (outData []byte) {
 	now := time.Now().Unix()
 	binary.BigEndian.PutUint32(outData[0:4], uint32(now))
 
-	rand.Read(outData[4 : 4+18])
+	crand.Read(outData[4 : 4+18])
 
 	hash := t.hmacSHA1(outData[:outSize-ssr.ObfsHMACSHA1Len])
 	copy(outData[outSize-ssr.ObfsHMACSHA1Len:], hash)

proxy/ssr/internal/protocol/auth_aes128_md5.go

@@ -4,9 +4,10 @@ import (
 	"bytes"
 	"crypto/aes"
 	"crypto/cipher"
+	crand "crypto/rand"
 	"encoding/base64"
 	"encoding/binary"
-	"math/rand"
+	"math/rand/v2"
 	"strconv"
 	"strings"
 	"time"
@@ -58,13 +59,13 @@ func (a *authAES128) GetServerInfo() (s *ssr.ServerInfo) {
 	return &a.ServerInfo
 }
 
-func (a *authAES128) SetData(data interface{}) {
+func (a *authAES128) SetData(data any) {
 	if auth, ok := data.(*AuthData); ok {
 		a.data = auth
 	}
 }
 
-func (a *authAES128) GetData() interface{} {
+func (a *authAES128) GetData() any {
 	if a.data == nil {
 		a.data = &AuthData{}
 	}
@@ -74,15 +75,14 @@ func (a *authAES128) GetData() interface{} {
 func (a *authAES128) packData(data []byte) (outData []byte) {
 	dataLength := len(data)
 	randLength := 1
-	rand.Seed(time.Now().UnixNano())
 	if dataLength <= 1200 {
 		if a.packID > 4 {
-			randLength += rand.Intn(32)
+			randLength += rand.IntN(32)
 		} else {
 			if dataLength > 900 {
-				randLength += rand.Intn(128)
+				randLength += rand.IntN(128)
 			} else {
-				randLength += rand.Intn(512)
+				randLength += rand.IntN(512)
 			}
 		}
 	}
@@ -98,7 +98,7 @@ func (a *authAES128) packData(data []byte) (outData []byte) {
 	h := a.hmac(key, outData[0:2])
 	copy(outData[2:4], h[:2])
 	// 4~rand length+4, rand number
-	rand.Read(outData[4 : 4+randLength])
+	crand.Read(outData[4 : 4+randLength])
 	// 4, rand length
 	if randLength < 128 {
 		outData[4] = byte(randLength & 0xFF)
@@ -121,11 +121,10 @@ func (a *authAES128) packData(data []byte) (outData []byte) {
 func (a *authAES128) packAuthData(data []byte) (outData []byte) {
 	dataLength := len(data)
 	var randLength int
-	rand.Seed(time.Now().UnixNano())
 	if dataLength > 400 {
-		randLength = rand.Intn(512)
+		randLength = rand.IntN(512)
 	} else {
-		randLength = rand.Intn(1024)
+		randLength = rand.IntN(1024)
 	}
 
 	dataOffset := randLength + 16 + 4 + 4 + 7
@@ -136,7 +135,7 @@ func (a *authAES128) packAuthData(data []byte) (outData []byte) {
 	copy(key, a.IV)
 	copy(key[a.IVLen:], a.Key)
 
-	rand.Read(outData[dataOffset-randLength:])
+	crand.Read(outData[dataOffset-randLength:])
 	a.data.mutex.Lock()
 	a.data.connectionID++
 	if a.data.connectionID > 0xFF000000 {
@@ -144,9 +143,9 @@ func (a *authAES128) packAuthData(data []byte) (outData []byte) {
 	}
 	if len(a.data.clientID) == 0 {
 		a.data.clientID = make([]byte, 8)
-		rand.Read(a.data.clientID)
+		crand.Read(a.data.clientID)
 		b := make([]byte, 4)
-		rand.Read(b)
+		crand.Read(b)
 		a.data.connectionID = binary.LittleEndian.Uint32(b) & 0xFFFFFF
 	}
 	copy(encrypt[4:], a.data.clientID)
@@ -163,13 +162,13 @@ func (a *authAES128) packAuthData(data []byte) (outData []byte) {
 	uid := make([]byte, 4)
 	if len(params) >= 2 {
 		if userID, err := strconv.ParseUint(params[0], 10, 32); err != nil {
-			rand.Read(uid)
+			crand.Read(uid)
 		} else {
 			binary.LittleEndian.PutUint32(uid, uint32(userID))
 			a.userKey = a.hashDigest([]byte(params[1]))
 		}
 	} else {
-		rand.Read(uid)
+		crand.Read(uid)
 	}
 
 	if a.userKey == nil {
@@ -196,7 +195,7 @@ func (a *authAES128) packAuthData(data []byte) (outData []byte) {
 	h := a.hmac(key, encrypt[0:20])
 	copy(encrypt[20:], h[:4])
 
-	rand.Read(outData[0:1])
+	crand.Read(outData[0:1])
 	h = a.hmac(key, outData[0:1])
 	copy(outData[1:], h[0:7-1])
 

proxy/ssr/internal/protocol/auth_chain_a.go

@@ -6,9 +6,9 @@ import (
 	"bytes"
 	"crypto/aes"
 	stdCipher "crypto/cipher"
+	"crypto/rand"
 	"encoding/base64"
 	"encoding/binary"
-	"math/rand"
 	"strconv"
 	"strings"
 	"time"
@@ -68,13 +68,13 @@ func (a *authChainA) GetServerInfo() (s *ssr.ServerInfo) {
 	return &a.ServerInfo
 }
 
-func (a *authChainA) SetData(data interface{}) {
+func (a *authChainA) SetData(data any) {
 	if auth, ok := data.(*AuthData); ok {
 		a.data = auth
 	}
 }
 
-func (a *authChainA) GetData() interface{} {
+func (a *authChainA) GetData() any {
 	if a.data == nil {
 		a.data = &AuthData{}
 	}
@@ -100,7 +100,7 @@ func authChainAGetRandLen(dataLength int, random *tools.Shift128plusContext, las
 
 func getRandStartPos(random *tools.Shift128plusContext, randLength int) int {
 	if randLength > 0 {
-		return int(random.Next() % 8589934609 % uint64(randLength))
+		return int(int64(random.Next()%8589934609) % int64(randLength))
 	}
 	return 0
 }
@@ -194,7 +194,7 @@ func (a *authChainA) packAuthData(data []byte) (outData []byte) {
 				copy(a.userKey, a.Key)
 			}
 		}
-		for i := 0; i < 4; i++ {
+		for i := range 4 {
 			uid[i] = a.uid[i] ^ a.lastClientHash[8+i]
 		}
 		base64UserKey = base64.StdEncoding.EncodeToString(a.userKey)

proxy/ssr/internal/protocol/auth_chain_b.go

@@ -34,14 +34,14 @@ func (a *authChainA) authChainBInitDataSize() {
 	random.InitFromBin(a.Key)
 	length := random.Next()%8 + 4
 	a.dataSizeList = make([]int, length)
-	for i := 0; i < int(length); i++ {
+	for i := range int(length) {
 		a.dataSizeList[i] = int(random.Next() % 2340 % 2040 % 1440)
 	}
 	sort.Ints(a.dataSizeList)
 
 	length = random.Next()%16 + 8
 	a.dataSizeList2 = make([]int, length)
-	for i := 0; i < int(length); i++ {
+	for i := range int(length) {
 		a.dataSizeList2[i] = int(random.Next() % 2340 % 2040 % 1440)
 	}
 	sort.Ints(a.dataSizeList2)

proxy/ssr/internal/protocol/auth_sha1_v4.go

@@ -2,8 +2,9 @@ package protocol
 
 import (
 	"bytes"
+	crand "crypto/rand"
 	"encoding/binary"
-	"math/rand"
+	"math/rand/v2"
 	"time"
 
 	"github.com/nadoo/glider/proxy/ssr/internal/ssr"
@@ -34,13 +35,13 @@ func (a *authSHA1v4) GetServerInfo() (s *ssr.ServerInfo) {
 	return &a.ServerInfo
 }
 
-func (a *authSHA1v4) SetData(data interface{}) {
+func (a *authSHA1v4) SetData(data any) {
 	if auth, ok := data.(*AuthData); ok {
 		a.data = auth
 	}
 }
 
-func (a *authSHA1v4) GetData() interface{} {
+func (a *authSHA1v4) GetData() any {
 	if a.data == nil {
 		a.data = &AuthData{}
 	}
@@ -53,9 +54,9 @@ func (a *authSHA1v4) packData(data []byte) (outData []byte) {
 
 	if dataLength <= 1300 {
 		if dataLength > 400 {
-			randLength += rand.Intn(128)
+			randLength += rand.IntN(128)
 		} else {
-			randLength += rand.Intn(1024)
+			randLength += rand.IntN(1024)
 		}
 	}
 
@@ -90,9 +91,9 @@ func (a *authSHA1v4) packAuthData(data []byte) (outData []byte) {
 	randLength := 1
 	if dataLength <= 1300 {
 		if dataLength > 400 {
-			randLength += rand.Intn(128)
+			randLength += rand.IntN(128)
 		} else {
-			randLength += rand.Intn(1024)
+			randLength += rand.IntN(1024)
 		}
 	}
 	dataOffset := randLength + 4 + 2
@@ -104,9 +105,9 @@ func (a *authSHA1v4) packAuthData(data []byte) (outData []byte) {
 	}
 	if len(a.data.clientID) == 0 {
 		a.data.clientID = make([]byte, 8)
-		rand.Read(a.data.clientID)
+		crand.Read(a.data.clientID)
 		b := make([]byte, 4)
-		rand.Read(b)
+		crand.Read(b)
 		a.data.connectionID = binary.LittleEndian.Uint32(b) & 0xFFFFFF
 	}
 	// 0-1, out length
@@ -122,7 +123,7 @@ func (a *authSHA1v4) packAuthData(data []byte) (outData []byte) {
 	// 2~6, crc of out length+salt+key
 	binary.LittleEndian.PutUint32(outData[2:], crc32)
 	// 6~rand length+6, rand numbers
-	rand.Read(outData[dataOffset-randLength : dataOffset])
+	crand.Read(outData[dataOffset-randLength : dataOffset])
 	// 6, rand length
 	if randLength < 128 {
 		outData[6] = byte(randLength & 0xFF)