redir: fix test error

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

.Dockerfile

@@ -7,7 +7,7 @@ RUN apk add --no-cache ca-certificates
 ARG TARGETPLATFORM
 RUN case $TARGETPLATFORM in \
         'linux/386') \
-            export FOLDER='default_linux_386'; \
+            export FOLDER='default_linux_386_sse2'; \
             ;; \
         'linux/amd64') \
             export FOLDER='default_linux_amd64_v1'; \
@@ -19,10 +19,10 @@ RUN case $TARGETPLATFORM in \
             export FOLDER='default_linux_arm_7'; \
             ;; \
         'linux/arm64') \
-            export FOLDER='default_linux_arm64'; \
+            export FOLDER='default_linux_arm64_v8.0'; \
             ;; \
         'linux/riscv64') \
-            export FOLDER='default_linux_riscv64'; \
+            export FOLDER='default_linux_riscv64_rva20u64'; \
             ;; \
         *) echo >&2 "error: unsupported architecture '$TARGETPLATFORM'"; exit 1 ;; \
     esac \

.github/workflows/build.yml

@@ -2,9 +2,9 @@ name: Build
 on:
   push:
     branches:
-      - 'dev'
+      - "dev"
     tags:
-      - '*'
+      - "*"
   pull_request:
 
 env:
@@ -19,96 +19,63 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
       - name: Set Vars
         run: |
           echo "SHA_SHORT=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
-          echo "GO_MOD_VERSION=$(grep -P "go \d+\." go.mod | cut -d " " -f2)" >> $GITHUB_ENV
 
       - name: Set up Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
         with:
           check-latest: true
-          go-version: ${{ env.GO_MOD_VERSION}}
+          go-version-file: "go.mod"
-
+          cache: true
-      - name: Set up Cache
-        uses: actions/cache@v3
-        with:
-          path: |
-            ~/go/pkg/mod
-            ~/.cache/go-build
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
 
       - name: Test
-        run: go test -v .
+        run: go test -v ./...
 
       - name: Build
-        uses: goreleaser/goreleaser-action@v2
+        uses: goreleaser/goreleaser-action@v6
         if: "!startsWith(github.ref, 'refs/tags/')"
         with:
-          version: latest
+          args: build --snapshot --clean
-          args: build --snapshot --rm-dist
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Upload Artifact - Linux amd64
+      - name: Upload Artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: "!startsWith(github.ref, 'refs/tags/')"
         with:
-          name: ${{ env.APP_NAME }}-dev-${{ env.SHA_SHORT }}-linux-amd64
+          name: ${{ env.APP_NAME }}-dev-${{ env.SHA_SHORT }}
           path: |
             ./dist/default_linux_amd64_v1/${{ env.APP_NAME }}
-
-      - name: Upload Artifact - Linux arm64
-        uses: actions/upload-artifact@v3
-        if: "!startsWith(github.ref, 'refs/tags/')"
-        with:
-          name: ${{ env.APP_NAME }}-dev-${{ env.SHA_SHORT }}-linux-arm64
-          path: |
             ./dist/default_linux_arm64/${{ env.APP_NAME }}
-
-      - name: Upload Artifact - macOS arm64
-        uses: actions/upload-artifact@v3
-        if: "!startsWith(github.ref, 'refs/tags/')"
-        with:
-          name: ${{ env.APP_NAME }}-dev-${{ env.SHA_SHORT }}-macos-arm64
-          path: |
             ./dist/default_darwin_arm64/${{ env.APP_NAME }}
-
-      - name: Upload Artifact - Windows amd64
-        uses: actions/upload-artifact@v3
-        if: "!startsWith(github.ref, 'refs/tags/')"
-        with:
-          name: ${{ env.APP_NAME }}-dev-${{ env.SHA_SHORT }}-windows-amd64
-          path: |
             ./dist/default_windows_amd64_v1/${{ env.APP_NAME }}.exe
 
       - name: Release
-        uses: goreleaser/goreleaser-action@v2
+        uses: goreleaser/goreleaser-action@v6
         if: startsWith(github.ref, 'refs/tags/')
         with:
-          version: latest
+          args: release --clean
-          args: release --rm-dist
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Docker - Set up Buildx
         id: buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
 
       - name: Docker - Login to DockerHub
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Docker - Login to GHCR
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -116,7 +83,7 @@ jobs:
 
       - name: Docker - Docker meta
         id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
         with:
           images: |
             ${{ env.DOCKERHUB_REPO }}
@@ -127,11 +94,10 @@ jobs:
             type=semver,pattern={{major}}.{{minor}}
 
       - name: Docker - Build and push
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: .Dockerfile
           platforms: ${{ env.PLATFORMS }}
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
-          

.github/workflows/stale.yml

@@ -7,7 +7,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v5
+      - 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

.gitignore

@@ -17,12 +17,14 @@
 # custom
 .idea
 .vscode
+.zed
 .DS_Store
 
 # dev test only
 /dev/
 dev*.go
 
+*_test.go
 
 dist
 

.goreleaser.yml

@@ -1,3 +1,5 @@
+version: 2
+
 before:
   hooks:
     - go mod tidy
@@ -35,13 +37,11 @@ archives:
   - id: default
     builds:
       - default
-    replacements:
-      darwin: macos
     wrap_in_directory: true
-    format: tar.gz
+    formats: tar.gz
     format_overrides:
       - goos: windows
-        format: zip
+        formats: zip
     files:
       - LICENSE
       - README.md
@@ -49,7 +49,7 @@ archives:
       - systemd/*
 
 snapshot:
-  name_template: '{{ incpatch .Version }}-dev-{{.ShortCommit}}'
+  version_template: '{{ incpatch .Version }}-dev-{{.ShortCommit}}'
 
 checksum:
   name_template: "{{ .ProjectName }}_{{ .Version }}_checksums.txt"
@@ -83,7 +83,7 @@ nfpms:
         dst: /etc/systemd/system/glider@.service
 
       - src: config/glider.conf.example
-        dst: /etc/glider/glider.conf
+        dst: /etc/glider/glider.conf.example
 
     scripts:
       postinstall: "systemd/postinstall.sh"

Dockerfile

@@ -1,5 +1,5 @@
 # Build Stage
-FROM golang:1.18-alpine AS build-env
+FROM golang:1.24-alpine AS build-env
 ADD . /src
 RUN apk --no-cache add git \
     && cd /src && go build -v -ldflags "-s -w"

README.md

@@ -3,7 +3,7 @@
 [![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).
@@ -82,7 +82,10 @@ we can set up local listeners as proxy servers, and forward requests to internet
 
 - 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
@@ -221,7 +224,7 @@ Help:
 
 see README.md and glider.conf.example for more details.
 --
-glider 0.16.1, https://github.com/nadoo/glider (glider.proxy@gmail.com)
+glider 0.16.4, https://github.com/nadoo/glider (glider.proxy@gmail.com)
 ```
 
 </details>
@@ -235,7 +238,10 @@ glider 0.16.1, https://github.com/nadoo/glider (glider.proxy@gmail.com)
 Direct scheme:
   direct://
 
-Only needed when you want to load balance multiple interfaces directly:
+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:
@@ -407,7 +413,7 @@ Examples:
   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 -listen -dns=:53 -dnsserver=8.8.8.8:53 -forward socks5://serverA:1080 -dnsrecord=abc.com/1.2.3.4
+  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.
 ```
 
@@ -438,7 +444,7 @@ glider -config CONFIG_PATH
 
 ## Linux Daemon
 
-- systemd: [https://github.com/nadoo/glider/blob/master/systemd/](https://github.com/nadoo/glider/blob/master/systemd/)
+- 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>
 
@@ -480,7 +486,7 @@ glider -config CONFIG_PATH
   // _ "github.com/nadoo/glider/proxy/kcp"
   ```
 
-3. Build it(requires **Go 1.18+** )
+3. Build it:
   ```bash
   go build -v -ldflags "-s -w"
   ```
@@ -532,5 +538,5 @@ glider -config CONFIG_PATH
 
 - [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

@@ -99,12 +99,12 @@ check=disable: disable health check`)
 	}
 
 	if *scheme != "" {
-		fmt.Fprintf(flag.Output(), proxy.Usage(*scheme))
+		fmt.Fprint(flag.Output(), proxy.Usage(*scheme))
 		os.Exit(0)
 	}
 
 	if *example {
-		fmt.Fprintf(flag.Output(), examples)
+		fmt.Fprint(flag.Output(), examples)
 		os.Exit(0)
 	}
 
@@ -249,6 +249,6 @@ Examples:
   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 -listen -dns=:53 -dnsserver=8.8.8.8:53 -forward socks5://serverA:1080 -dnsrecord=abc.com/1.2.3.4
+  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

@@ -31,7 +31,7 @@ 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
 
 # forwarder health check

config/examples/9.transparent_proxy_without_dnsmasq/README.md

@@ -82,7 +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:
@@ -91,10 +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/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
@@ -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
 # ----------
@@ -139,7 +140,7 @@ listen=socks5://:1080
 # 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
+# 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
@@ -222,7 +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
@@ -279,7 +280,7 @@ dnsrecord=www.example.com/2606:2800:220:1:248:1893:25c8:1946
 # 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

dns/client.go

@@ -179,7 +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 {

dns/message.go

@@ -5,17 +5,14 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
-	"math/rand"
+	"math/rand/v2"
 	"net/netip"
 	"strings"
 )
 
 // UDPMaxLen is the max size of udp dns request.
-// https://www.rfc-editor.org/rfc/rfc1035#section-4.2.1
+// https://www.dnsflagday.net/2020/
-// Messages carried by UDP are restricted to 512 bytes (not counting the IP
+const UDPMaxLen = 1232
-// or UDP headers).  Longer messages are truncated and the TC bit is set in
-// the header.
-const UDPMaxLen = 512
 
 // HeaderLen is the length of dns msg header.
 const HeaderLen = 12
@@ -44,16 +41,16 @@ const ClassINET uint16 = 1
 // 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       |
+//	|        Header       |
-//     +---------------------+
+//	+---------------------+
-//     |       Question      | the question for the name server
+//	|       Question      | the question for the name server
-//     +---------------------+
+//	+---------------------+
-//     |        Answer       | RRs answering the question
+//	|        Answer       | RRs answering the question
-//     +---------------------+
+//	+---------------------+
-//     |      Authority      | RRs pointing toward an authority
+//	|      Authority      | RRs pointing toward an authority
-//     +---------------------+
+//	+---------------------+
-//     |      Additional     | RRs holding additional information
+//	|      Additional     | RRs holding additional information
 type Message struct {
 	Header
 	// most dns implementation only support 1 question
@@ -149,7 +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 {
@@ -169,22 +166,21 @@ func UnmarshalMessage(b []byte) (*Message, error) {
 // https://www.rfc-editor.org/rfc/rfc1035#section-4.1.1
 // The header contains the following fields:
 //
-//                                     1  1  1  1  1  1
+//	                                1  1  1  1  1  1
-//       0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
+//	  0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                      ID                       |
+//	|                      ID                       |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |QR|   Opcode  |AA|TC|RD|RA|   Z    |   RCODE   |
+//	|QR|   Opcode  |AA|TC|RD|RA|   Z    |   RCODE   |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                    QDCOUNT                    |
+//	|                    QDCOUNT                    |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                    ANCOUNT                    |
+//	|                    ANCOUNT                    |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                    NSCOUNT                    |
+//	|                    NSCOUNT                    |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                    ARCOUNT                    |
+//	|                    ARCOUNT                    |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//
 type Header struct {
 	ID      uint16
 	Bits    uint16
@@ -214,10 +210,11 @@ func (h *Header) SetAncount(ancount int) {
 	h.ANCOUNT = uint16(ancount)
 }
 
-func (h *Header) setFlag(QR uint16, Opcode uint16, AA uint16,
+// Not used now, but keep it for future use.
-	TC uint16, RD uint16, RA uint16, RCODE uint16) {
+// func (h *Header) setFlag(QR uint16, Opcode uint16, AA uint16,
-	h.Bits = QR<<15 + Opcode<<11 + AA<<10 + TC<<9 + RD<<8 + RA<<7 + RCODE
+// 	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) {
@@ -250,17 +247,17 @@ func UnmarshalHeader(b []byte, h *Header) error {
 // 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
+//	                                1  1  1  1  1  1
-//       0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
+//	  0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                                               |
+//	|                                               |
-//     /                     QNAME                     /
+//	/                     QNAME                     /
-//     /                                               /
+//	/                                               /
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                     QTYPE                     |
+//	|                     QTYPE                     |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                     QCLASS                    |
+//	|                     QCLASS                    |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type Question struct {
 	QNAME  string
 	QTYPE  uint16
@@ -328,26 +325,26 @@ func (m *Message) UnmarshalQuestion(b []byte, q *Question) (n int, err error) {
 // records is specified in the corresponding count field in the header.
 // Each resource record has the following format:
 //
-//                                     1  1  1  1  1  1
+//	                                1  1  1  1  1  1
-//       0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
+//	  0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                                               |
+//	|                                               |
-//     /                                               /
+//	/                                               /
-//     /                      NAME                     /
+//	/                      NAME                     /
-//     |                                               |
+//	|                                               |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                      TYPE                     |
+//	|                      TYPE                     |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                     CLASS                     |
+//	|                     CLASS                     |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                      TTL                      |
+//	|                      TTL                      |
-//     |                                               |
+//	|                                               |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
-//     |                   RDLENGTH                    |
+//	|                   RDLENGTH                    |
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
-//     /                     RDATA                     /
+//	/                     RDATA                     /
-//     /                                               /
+//	/                                               /
-//     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//	+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type RR struct {
 	NAME     string
 	TYPE     uint16

go.mod

@@ -1,36 +1,29 @@
 module github.com/nadoo/glider
 
-go 1.18
+go 1.24
 
 require (
 	github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da
 	github.com/dgryski/go-camellia v0.0.0-20191119043421-69a8a13fb23d
 	github.com/dgryski/go-idea v0.0.0-20170306091226-d2fb45a411fb
 	github.com/dgryski/go-rc2 v0.0.0-20150621095337-8a9021637152
-	github.com/insomniacslk/dhcp v0.0.0-20220504074936-1ca156eafb9f
+	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 v5.6.1
+	github.com/xtaci/kcp-go/v5 v5.6.18
-	golang.org/x/crypto v0.0.0-20220511200225-c6db032c6c88
+	golang.org/x/crypto v0.35.0
-	golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6
+	golang.org/x/sys v0.30.0
 )
 
 require (
 	github.com/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521 // indirect
-	github.com/klauspost/cpuid/v2 v2.0.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.10 // indirect
-	github.com/klauspost/reedsolomon v1.9.16 // indirect
+	github.com/klauspost/reedsolomon v1.12.4 // indirect
-	github.com/mdlayher/ethernet v0.0.0-20220221185849-529eae5b6118 // indirect
+	github.com/pierrec/lz4/v4 v4.1.22 // indirect
-	github.com/mdlayher/raw v0.1.0 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/templexxx/cpu v0.0.10-0.20211111114238-98168dcec14a // indirect
+	github.com/templexxx/cpu v0.1.1 // indirect
-	github.com/templexxx/xorsimd v0.4.1 // indirect
+	github.com/templexxx/xorsimd v0.4.3 // indirect
 	github.com/tjfoc/gmsm v1.4.1 // indirect
-	github.com/u-root/uio v0.0.0-20220204230159-dac05f7d2cb4 // indirect
+	github.com/u-root/uio v0.0.0-20240224005618-d2acac8f3701 // indirect
-	golang.org/x/net v0.0.0-20220425223048-2871e0cb64e4 // indirect
+	golang.org/x/net v0.35.0 // indirect
 )
-
-// Replace dependency modules with local developing copy
-// use `go list -m all` to confirm the final module used
-// replace (
-//	github.com/nadoo/conflag => ../conflag
-// )

go.sum

@@ -18,7 +18,6 @@ github.com/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521/go.mod h1:ucvhdsUCE3TH0Lo
 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/fanliao/go-promise v0.0.0-20141029170127-1890db352a72/go.mod h1:PjfxuH4FZdUyfMdtBio2lsRr1AKEaVPwelzuHuh8Lqc=
 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=
@@ -34,154 +33,82 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
 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/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/insomniacslk/dhcp v0.0.0-20250109001534-8abf58130905 h1:q3OEI9RaN/wwcx+qgGo6ZaoJkCiDYe/gjDLfq7lQQF4=
-github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/insomniacslk/dhcp v0.0.0-20250109001534-8abf58130905/go.mod h1:VvGYjkZoJyKqlmT1yzakUs4mfKMNB0XdODP0+rdml6k=
-github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
+github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtLA=
-github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
+github.com/josharian/native v1.1.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
-github.com/hugelgupf/socketpair v0.0.0-20190730060125-05d35a94e714/go.mod h1:2Goc3h8EklBH5mspfHFxBnEoURQCGzQQH1ga9Myjvis=
+github.com/klauspost/cpuid/v2 v2.2.10 h1:tBs3QSyvjDyFTq3uoc/9xFpCuOsJQFNPiAhYdw2skhE=
-github.com/insomniacslk/dhcp v0.0.0-20220504074936-1ca156eafb9f h1:l1QCwn715k8nYkj4Ql50rzEog3WnMdrd4YYMMwemxEo=
+github.com/klauspost/cpuid/v2 v2.2.10/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
-github.com/insomniacslk/dhcp v0.0.0-20220504074936-1ca156eafb9f/go.mod h1:h+MxyHxRg9NH3terB1nfRIUaQEcI0XOVkdR9LNBlp8E=
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-github.com/josharian/native v1.0.0 h1:Ts/E8zCSEsG17dUqv7joXJFybuMLjQfWE04tsBODTxk=
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-github.com/josharian/native v1.0.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
+github.com/mdlayher/packet v1.1.2 h1:3Up1NG6LZrsgDVn6X4L9Ge/iyRyxFEFD9o6Pr3Q1nQY=
-github.com/jsimonetti/rtnetlink v0.0.0-20190606172950-9527aa82566a/go.mod h1:Oz+70psSo5OFh8DBl0Zv2ACw7Esh6pPUphlvZG9x7uw=
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-github.com/jsimonetti/rtnetlink v0.0.0-20200117123717-f846d4f6c1f4/go.mod h1:WGuG/smIU4J/54PblvSbh+xvCZmpJnFgr3ds6Z55XMQ=
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-github.com/jsimonetti/rtnetlink v0.0.0-20201009170750-9c6f07d100c1/go.mod h1:hqoO/u39cqLeBLebZ8fWdE96O7FxrAsRYhnVOdgHxok=
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-github.com/jsimonetti/rtnetlink v0.0.0-20201110080708-d2c240429e6c/go.mod h1:huN4d1phzjhlOsNIjFsw2SVRbwIHj3fJDMEU2SDPTmg=
-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/go.mod h1:bYW4mA6ZgKPob1/Dlai2LviZJO7KGI3uoWLd42rAQw4=
-github.com/klauspost/cpuid/v2 v2.0.6/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
-github.com/klauspost/cpuid/v2 v2.0.12 h1:p9dKCg8i4gmOxtv35DvrYoWqYzQrvEVdjQ762Y0OqZE=
-github.com/klauspost/cpuid/v2 v2.0.12/go.mod h1:g2LTdtYhdyuGPqyWyv7qRAmj1WBqxuObKfj5c0PQa7c=
-github.com/klauspost/reedsolomon v1.9.9/go.mod h1:O7yFFHiQwDR6b2t63KPUpccPtNdp5ADgh1gg4fd12wo=
-github.com/klauspost/reedsolomon v1.9.16 h1:mR0AwphBwqFv/I3B9AHtNKvzuowI1vrj8/3UX4XRmHA=
-github.com/klauspost/reedsolomon v1.9.16/go.mod h1:eqPAcE7xar5CIzcdfwydOEdcmchAKAP/qs14y4GCBOk=
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-github.com/mdlayher/raw v0.0.0-20191009151244-50f2db8cc065/go.mod h1:7EpbotpCmVZcu+KCX4g9WaRNuu11uyhiW7+Le1dKawg=
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-github.com/mdlayher/socket v0.2.1 h1:F2aaOwb53VsBE+ebRS9bLd7yPOfYUMC8lOODdCBDY6w=
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 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
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 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
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 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=
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-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/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/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 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=
@@ -196,9 +123,7 @@ google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQ
 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/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0 h1:hjy8E9ON/egN1tAYqKb61G10WtihqetD4sz2H+8nIeA=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/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=
-rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=

main.go

@@ -17,7 +17,7 @@ import (
 )
 
 var (
-	version = "0.16.2"
+	version = "0.17.0"
 	config  = parseConfig()
 )
 

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() any {
-			return make([]byte, size)
+			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
+		i := bits.Len32(uint32(size - 1))
-		if sizes[i] < size {
+		if p := pools[i].Get().(*byte); p != nil {
-			i += 1
+			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/smux/LICENSE

@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2016-2017 Daniel Fu
-
-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.

pkg/smux/frame.go

@@ -1,3 +1,25 @@
+// 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 (
@@ -38,16 +60,18 @@ const (
 
 // Frame defines a packet from or to be multiplexed into a single connection
 type Frame struct {
-	ver  byte
+	ver  byte   // version
-	cmd  byte
+	cmd  byte   // command
-	sid  uint32
+	sid  uint32 // stream id
-	data []byte
+	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 {
@@ -71,6 +95,7 @@ func (h rawHeader) String() string {
 		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 {

pkg/smux/mux.go

@@ -1,7 +1,25 @@
-// Package smux is a multiplexing library for Golang.
+// MIT License
 //
-// It relies on an underlying connection to provide reliability and ordering, such as TCP or KCP,
+// Copyright (c) 2016-2017 xtaci
-// and provides stream-oriented multiplexing over a single channel.
+//
+// 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 (

pkg/smux/mux_test.go

@@ -1,86 +0,0 @@
-package smux
-
-import (
-	"bytes"
-	"testing"
-)
-
-type buffer struct {
-	bytes.Buffer
-}
-
-func (b *buffer) Close() error {
-	b.Buffer.Reset()
-	return nil
-}
-
-func TestConfig(t *testing.T) {
-	VerifyConfig(DefaultConfig())
-
-	config := DefaultConfig()
-	config.KeepAliveInterval = 0
-	err := VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	config = DefaultConfig()
-	config.KeepAliveInterval = 10
-	config.KeepAliveTimeout = 5
-	err = VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	config = DefaultConfig()
-	config.MaxFrameSize = 0
-	err = VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	config = DefaultConfig()
-	config.MaxFrameSize = 65536
-	err = VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	config = DefaultConfig()
-	config.MaxReceiveBuffer = 0
-	err = VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	config = DefaultConfig()
-	config.MaxStreamBuffer = 0
-	err = VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	config = DefaultConfig()
-	config.MaxStreamBuffer = 100
-	config.MaxReceiveBuffer = 99
-	err = VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	var bts buffer
-	if _, err := Server(&bts, config); err == nil {
-		t.Fatal("server started with wrong config")
-	}
-
-	if _, err := Client(&bts, config); err == nil {
-		t.Fatal("client started with wrong config")
-	}
-}

pkg/smux/session.go

@@ -1,13 +1,34 @@
+// 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"
-	"fmt"
 	"io"
 	"net"
-	"os"
+	"runtime"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -17,32 +38,52 @@ import (
 
 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")
+	ErrInvalidProtocol           = errors.New("invalid protocol")
-	ErrConsumed        = errors.New("peer consumed more than sent")
+	ErrConsumed                  = errors.New("peer consumed more than sent")
-	ErrGoAway          = errors.New("stream id overflows, should start a new connection")
+	ErrGoAway                    = errors.New("stream id overflows, should start a new connection")
-	// ErrTimeout         = errors.New("timeout")
+	ErrTimeout         net.Error = &timeoutError{}
-	ErrTimeout    = fmt.Errorf("smux: %w", os.ErrDeadlineExceeded)
+	ErrWouldBlock                = errors.New("operation would block on IO")
-	ErrWouldBlock = errors.New("operation would block on IO")
 )
 
+// writeRequest represents a request to write a frame
 type writeRequest struct {
-	prio   uint32
+	class  CLASSID
 	frame  Frame
+	seq    uint32
 	result chan writeResult
 }
 
+// writeResult represents the result of a write request
 type writeResult struct {
 	n   int
 	err error
 }
 
-type buffersWriter interface {
-	WriteBuffers(v [][]byte) (n int, err error)
-}
-
 // Session defines a multiplexed connection for streams
 type Session struct {
 	conn io.ReadWriteCloser
@@ -54,7 +95,7 @@ type Session struct {
 	bucket       int32         // token bucket
 	bucketNotify chan struct{} // used for waiting for tokens
 
-	streams    map[uint32]*Stream // all streams in this session
+	streams    map[uint32]*stream // all streams in this session
 	streamLock sync.Mutex         // locks streams
 
 	die     chan struct{} // flag session has died
@@ -73,7 +114,7 @@ type Session struct {
 	chProtoError   chan struct{}
 	protoErrorOnce sync.Once
 
-	chAccepts chan *Stream
+	chAccepts chan *stream
 
 	dataReady int32 // flag data has arrived
 
@@ -81,8 +122,9 @@ type Session struct {
 
 	deadline atomic.Value
 
-	shaper chan writeRequest // a shaper for writing
+	requestID uint32            // Monotonic increasing write request ID
-	writes chan writeRequest
+	shaper    chan writeRequest // a shaper for writing
+	writes    chan writeRequest
 }
 
 func newSession(config *Config, conn io.ReadWriteCloser, client bool) *Session {
@@ -90,8 +132,8 @@ func newSession(config *Config, conn io.ReadWriteCloser, client bool) *Session {
 	s.die = make(chan struct{})
 	s.conn = conn
 	s.config = config
-	s.streams = make(map[uint32]*Stream)
+	s.streams = make(map[uint32]*stream)
-	s.chAccepts = make(chan *Stream, defaultAcceptBacklog)
+	s.chAccepts = make(chan *stream, defaultAcceptBacklog)
 	s.bucket = int32(config.MaxReceiveBuffer)
 	s.bucketNotify = make(chan struct{}, 1)
 	s.shaper = make(chan writeRequest)
@@ -139,7 +181,7 @@ func (s *Session) OpenStream() (*Stream, error) {
 
 	stream := newStream(sid, s.config.MaxFrameSize, s)
 
-	if _, err := s.writeFrame(newFrame(byte(s.config.Version), cmdSYN, sid)); err != nil {
+	if _, err := s.writeControlFrame(newFrame(byte(s.config.Version), cmdSYN, sid)); err != nil {
 		return nil, err
 	}
 
@@ -154,7 +196,14 @@ func (s *Session) OpenStream() (*Stream, error) {
 		return nil, io.ErrClosedPipe
 	default:
 		s.streams[sid] = stream
-		return stream, nil
+		wrapper := &Stream{stream: stream}
+		// NOTE(x): disabled finalizer for issue #997
+		/*
+			runtime.SetFinalizer(wrapper, func(s *Stream) {
+				s.Close()
+			})
+		*/
+		return wrapper, nil
 	}
 }
 
@@ -175,7 +224,11 @@ func (s *Session) AcceptStream() (*Stream, error) {
 
 	select {
 	case stream := <-s.chAccepts:
-		return stream, nil
+		wrapper := &Stream{stream: stream}
+		runtime.SetFinalizer(wrapper, func(s *Stream) {
+			s.Close()
+		})
+		return wrapper, nil
 	case <-deadline:
 		return nil, ErrTimeout
 	case <-s.chSocketReadError:
@@ -212,6 +265,12 @@ func (s *Session) Close() error {
 	}
 }
 
+// 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 {
@@ -291,12 +350,15 @@ func (s *Session) RemoteAddr() net.Addr {
 // notify the session that a stream has closed
 func (s *Session) streamClosed(sid uint32) {
 	s.streamLock.Lock()
-	if n := s.streams[sid].recycleTokens(); n > 0 { // return remaining tokens to the bucket
+	if stream, ok := s.streams[sid]; ok {
-		if atomic.AddInt32(&s.bucket, int32(n)) > 0 {
+		n := stream.recycleTokens()
-			s.notifyBucket()
+		if n > 0 { // return remaining tokens to the bucket
+			if atomic.AddInt32(&s.bucket, int32(n)) > 0 {
+				s.notifyBucket()
+			}
 		}
+		delete(s.streams, sid)
 	}
-	delete(s.streams, sid)
 	s.streamLock.Unlock()
 }
 
@@ -331,7 +393,7 @@ func (s *Session) recvLoop() {
 			sid := hdr.StreamID()
 			switch hdr.Cmd() {
 			case cmdNOP:
-			case cmdSYN:
+			case cmdSYN: // stream opening
 				s.streamLock.Lock()
 				if _, ok := s.streams[sid]; !ok {
 					stream := newStream(sid, s.config.MaxFrameSize, s)
@@ -342,22 +404,26 @@ func (s *Session) recvLoop() {
 					}
 				}
 				s.streamLock.Unlock()
-			case cmdFIN:
+			case cmdFIN: // stream closing
 				s.streamLock.Lock()
 				if stream, ok := s.streams[sid]; ok {
 					stream.fin()
 					stream.notifyReadEvent()
 				}
 				s.streamLock.Unlock()
-			case cmdPSH:
+			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 {
@@ -365,7 +431,7 @@ func (s *Session) recvLoop() {
 						return
 					}
 				}
-			case cmdUPD:
+			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 {
@@ -387,6 +453,7 @@ func (s *Session) recvLoop() {
 	}
 }
 
+// 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)
@@ -395,7 +462,7 @@ func (s *Session) keepalive() {
 	for {
 		select {
 		case <-tickerPing.C:
-			s.writeFrameInternal(newFrame(byte(s.config.Version), cmdNOP, 0), tickerPing.C, 0)
+			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) {
@@ -412,13 +479,16 @@ func (s *Session) keepalive() {
 	}
 }
 
-// shaper shapes the sending sequence among streams
+// 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)
@@ -426,10 +496,22 @@ func (s *Session) shaperLoop() {
 			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 := <-s.shaper:
+		case r := <-chShaper:
 			if chWrite != nil { // next is valid, reshape
 				heap.Push(&reqs, next)
 			}
@@ -439,13 +521,17 @@ func (s *Session) shaperLoop() {
 	}
 }
 
+// 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.(buffersWriter)
+	bw, ok := s.conn.(interface {
+		WriteBuffers(v [][]byte) (n int, err error)
+	})
+
 	if ok {
 		buf = make([]byte, headerSize)
 		vec = make([][]byte, 2)
@@ -463,6 +549,7 @@ func (s *Session) sendLoop() {
 			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
@@ -494,17 +581,21 @@ func (s *Session) sendLoop() {
 	}
 }
 
-// writeFrame writes the frame to the underlying connection
+// writeControlFrame writes the control frame to the underlying connection
 // and returns the number of bytes written if successful
-func (s *Session) writeFrame(f Frame) (n int, err error) {
+func (s *Session) writeControlFrame(f Frame) (n int, err error) {
-	return s.writeFrameInternal(f, nil, 0)
+	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, prio uint32) (int, error) {
+func (s *Session) writeFrameInternal(f Frame, deadline <-chan time.Time, class CLASSID) (int, error) {
 	req := writeRequest{
-		prio:   prio,
+		class:  class,
 		frame:  f,
+		seq:    atomic.AddUint32(&s.requestID, 1),
 		result: make(chan writeResult, 1),
 	}
 	select {

pkg/smux/shaper.go

@@ -1,17 +1,53 @@
+// 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) }
+func (h shaperHeap) Len() int { return len(h) }
-func (h shaperHeap) Less(i, j int) bool { return _itimediff(h[j].prio, h[i].prio) > 0 }
-func (h shaperHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
-func (h *shaperHeap) Push(x any)        { *h = append(*h, x.(writeRequest)) }
 
-func (h *shaperHeap) Pop() any {
+// 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]

pkg/smux/shaper_test.go

@@ -1,32 +0,0 @@
-package smux
-
-import (
-	"container/heap"
-	"testing"
-)
-
-func TestShaper(t *testing.T) {
-	w1 := writeRequest{prio: 10}
-	w2 := writeRequest{prio: 10}
-	w3 := writeRequest{prio: 20}
-	w4 := writeRequest{prio: 100}
-	w5 := writeRequest{prio: (1 << 32) - 1}
-
-	var reqs shaperHeap
-	heap.Push(&reqs, w5)
-	heap.Push(&reqs, w4)
-	heap.Push(&reqs, w3)
-	heap.Push(&reqs, w2)
-	heap.Push(&reqs, w1)
-
-	var lastPrio = reqs[0].prio
-	for len(reqs) > 0 {
-		w := heap.Pop(&reqs).(writeRequest)
-		if int32(w.prio-lastPrio) < 0 {
-			t.Fatal("incorrect shaper priority")
-		}
-
-		t.Log("prio:", w.prio)
-		lastPrio = w.prio
-	}
-}

pkg/smux/stream.go

@@ -1,3 +1,25 @@
+// 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 (
@@ -11,36 +33,41 @@ import (
 	"github.com/nadoo/glider/pkg/pool"
 )
 
-// Stream implements net.Conn
+// wrapper for GC
 type Stream struct {
-	id   uint32
+	*stream
+}
+
+// Stream implements net.Conn
+type stream struct {
+	id   uint32 // Stream identifier
 	sess *Session
 
-	buffers [][]byte
+	buffers [][]byte // the sequential buffers of stream
-	heads   [][]byte // slice heads kept for recycle
+	heads   [][]byte // slice heads of the buffers above, kept for recycle
 
-	bufferLock sync.Mutex
+	bufferLock sync.Mutex // Mutex to protect access to buffers
-	frameSize  int
+	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
+	dieOnce sync.Once // Ensures die channel is closed only once
 
 	// FIN command
 	chFinEvent   chan struct{}
-	finEventOnce sync.Once
+	finEventOnce sync.Once // Ensures chFinEvent is closed only once
 
 	// deadlines
 	readDeadline  atomic.Value
 	writeDeadline atomic.Value
 
 	// per stream sliding window control
-	numRead    uint32 // number of consumed bytes
+	numRead    uint32 // count num of bytes read
 	numWritten uint32 // count num of bytes written
-	incr       uint32 // counting for sending
+	incr       uint32 // bytes sent since last window update
 
 	// UPD command
 	peerConsumed uint32        // num of bytes the peer has consumed
@@ -48,9 +75,9 @@ type Stream struct {
 	chUpdate     chan struct{} // notify of remote data consuming and window update
 }
 
-// newStream initiates a Stream struct
+// newStream initializes and returns a new Stream.
-func newStream(id uint32, frameSize int, sess *Session) *Stream {
+func newStream(id uint32, frameSize int, sess *Session) *stream {
-	s := new(Stream)
+	s := new(stream)
 	s.id = id
 	s.chReadEvent = make(chan struct{}, 1)
 	s.chUpdate = make(chan struct{}, 1)
@@ -59,16 +86,17 @@ func newStream(id uint32, frameSize int, sess *Session) *Stream {
 	s.die = make(chan struct{})
 	s.chFinEvent = make(chan struct{})
 	s.peerWindow = initialPeerWindow // set to initial window size
+
 	return s
 }
 
-// ID returns the unique stream ID.
+// ID returns the stream's unique identifier.
-func (s *Stream) ID() uint32 {
+func (s *stream) ID() uint32 {
 	return s.id
 }
 
-// Read implements net.Conn
+// Read reads data from the stream into the provided buffer.
-func (s *Stream) Read(b []byte) (n int, err error) {
+func (s *stream) Read(b []byte) (n int, err error) {
 	for {
 		n, err = s.tryRead(b)
 		if err == ErrWouldBlock {
@@ -81,8 +109,8 @@ func (s *Stream) Read(b []byte) (n int, err error) {
 	}
 }
 
-// tryRead is the nonblocking version of Read
+// tryRead attempts to read data from the stream without blocking.
-func (s *Stream) tryRead(b []byte) (n int, err error) {
+func (s *stream) tryRead(b []byte) (n int, err error) {
 	if s.sess.config.Version == 2 {
 		return s.tryReadv2(b)
 	}
@@ -91,6 +119,7 @@ func (s *Stream) tryRead(b []byte) (n int, err error) {
 		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])
@@ -118,7 +147,8 @@ func (s *Stream) tryRead(b []byte) (n int, err error) {
 	}
 }
 
-func (s *Stream) tryReadv2(b []byte) (n int, err error) {
+// 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
 	}
@@ -139,25 +169,31 @@ func (s *Stream) tryReadv2(b []byte) (n int, err error) {
 
 	// in an ideal environment:
 	// if more than half of buffer has consumed, send read ack to peer
-	// based on round-trip time of ACK, continuous flowing data
+	// based on round-trip time of ACK, continous flowing data
-	// won't slow down because of waiting for ACK, as long as the
+	// won't slow down due to waiting for ACK, as long as the
-	// consumer keeps on reading data
+	// consumer keeps on reading data.
-	// s.numRead == n also notify window at the first read
+	//
+	// 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
+		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
 		}
-		return n, nil
 	}
 
 	select {
@@ -169,7 +205,12 @@ func (s *Stream) tryReadv2(b []byte) (n int, err error) {
 }
 
 // WriteTo implements io.WriteTo
-func (s *Stream) WriteTo(w io.Writer) (n int64, err error) {
+// 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)
 	}
@@ -186,6 +227,7 @@ func (s *Stream) WriteTo(w io.Writer) (n int64, err error) {
 
 		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 {
@@ -201,7 +243,8 @@ func (s *Stream) WriteTo(w io.Writer) (n int64, err error) {
 	}
 }
 
-func (s *Stream) writeTov2(w io.Writer) (n int64, err error) {
+// check comments in WriteTo
+func (s *stream) writeTov2(w io.Writer) (n int64, err error) {
 	for {
 		var notifyConsumed uint32
 		var buf []byte
@@ -221,6 +264,7 @@ func (s *Stream) writeTov2(w io.Writer) (n int64, err error) {
 
 		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 {
@@ -242,7 +286,8 @@ func (s *Stream) writeTov2(w io.Writer) (n int64, err error) {
 	}
 }
 
-func (s *Stream) sendWindowUpdate(consumed uint32) error {
+// 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() {
@@ -256,11 +301,12 @@ func (s *Stream) sendWindowUpdate(consumed uint32) error {
 	binary.LittleEndian.PutUint32(hdr[:], consumed)
 	binary.LittleEndian.PutUint32(hdr[4:], uint32(s.sess.config.MaxStreamBuffer))
 	frame.data = hdr[:]
-	_, err := s.sess.writeFrameInternal(frame, deadline, 0)
+	_, err := s.sess.writeFrameInternal(frame, deadline, CLSCTRL)
 	return err
 }
 
-func (s *Stream) waitRead() error {
+// 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() {
@@ -270,9 +316,15 @@ func (s *Stream) waitRead() error {
 	}
 
 	select {
-	case <-s.chReadEvent:
+	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)
@@ -290,7 +342,7 @@ func (s *Stream) waitRead() error {
 //
 // 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) {
+func (s *stream) Write(b []byte) (n int, err error) {
 	if s.sess.config.Version == 2 {
 		return s.writeV2(b)
 	}
@@ -304,6 +356,8 @@ func (s *Stream) Write(b []byte) (n int, err error) {
 
 	// check if stream has closed
 	select {
+	case <-s.chFinEvent: // passive closing
+		return 0, io.EOF
 	case <-s.die:
 		return 0, io.ErrClosedPipe
 	default:
@@ -320,7 +374,7 @@ func (s *Stream) Write(b []byte) (n int, err error) {
 		}
 		frame.data = bts[:sz]
 		bts = bts[sz:]
-		n, err := s.sess.writeFrameInternal(frame, deadline, s.numWritten)
+		n, err := s.sess.writeFrameInternal(frame, deadline, CLSDATA)
 		s.numWritten++
 		sent += n
 		if err != nil {
@@ -331,7 +385,8 @@ func (s *Stream) Write(b []byte) (n int, err error) {
 	return sent, nil
 }
 
-func (s *Stream) writeV2(b []byte) (n int, err error) {
+// 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
@@ -339,6 +394,8 @@ func (s *Stream) writeV2(b []byte) (n int, err error) {
 
 	// check if stream has closed
 	select {
+	case <-s.chFinEvent:
+		return 0, io.EOF
 	case <-s.die:
 		return 0, io.ErrClosedPipe
 	default:
@@ -365,14 +422,18 @@ func (s *Stream) writeV2(b []byte) (n int, err error) {
 		// even if uint32 overflow, this math still works:
 		// eg1: uint32(0) - uint32(math.MaxUint32) = 1
 		// eg2: int32(uint32(0) - uint32(1)) = -1
-		// security check for misbehavior
+		//
+		// basicially, you can take it as a MODULAR ARITHMETIC
 		inflight := int32(atomic.LoadUint32(&s.numWritten) - atomic.LoadUint32(&s.peerConsumed))
-		if inflight < 0 {
+		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
@@ -381,14 +442,18 @@ func (s *Stream) writeV2(b []byte) (n int, err error) {
 				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:]
-				n, err := s.sess.writeFrameInternal(frame, deadline, atomic.LoadUint32(&s.numWritten))
+
+				// transmit of frame
+				n, err := s.sess.writeFrameInternal(frame, deadline, CLSDATA)
 				atomic.AddUint32(&s.numWritten, uint32(sz))
 				sent += n
 				if err != nil {
@@ -397,12 +462,12 @@ func (s *Stream) writeV2(b []byte) (n int, err error) {
 			}
 		}
 
-		// if there is any data remaining to be sent
+		// if there is any data left to be sent,
 		// wait until stream closes, window changes or deadline reached
-		// this blocking behavior will inform upper layer to do flow control
+		// this blocking behavior will back propagate flow control to upper layer.
 		if len(b) > 0 {
 			select {
-			case <-s.chFinEvent: // if fin arrived, future window update is impossible
+			case <-s.chFinEvent:
 				return 0, io.EOF
 			case <-s.die:
 				return sent, io.ErrClosedPipe
@@ -410,7 +475,7 @@ func (s *Stream) writeV2(b []byte) (n int, err error) {
 				return sent, ErrTimeout
 			case <-s.sess.chSocketWriteError:
 				return sent, s.sess.socketWriteError.Load().(error)
-			case <-s.chUpdate:
+			case <-s.chUpdate: // notify of remote data consuming and window update
 				continue
 			}
 		} else {
@@ -420,7 +485,7 @@ func (s *Stream) writeV2(b []byte) (n int, err error) {
 }
 
 // Close implements net.Conn
-func (s *Stream) Close() error {
+func (s *stream) Close() error {
 	var once bool
 	var err error
 	s.dieOnce.Do(func() {
@@ -429,23 +494,30 @@ func (s *Stream) Close() error {
 	})
 
 	if once {
-		_, err = s.sess.writeFrame(newFrame(byte(s.sess.config.Version), cmdFIN, s.id))
+		// 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
 	}
-	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{} {
+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 {
+func (s *stream) SetReadDeadline(t time.Time) error {
 	s.readDeadline.Store(t)
 	s.notifyReadEvent()
 	return nil
@@ -454,7 +526,7 @@ func (s *Stream) SetReadDeadline(t time.Time) error {
 // 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 {
+func (s *stream) SetWriteDeadline(t time.Time) error {
 	s.writeDeadline.Store(t)
 	return nil
 }
@@ -462,7 +534,7 @@ func (s *Stream) SetWriteDeadline(t time.Time) error {
 // 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 {
+func (s *stream) SetDeadline(t time.Time) error {
 	if err := s.SetReadDeadline(t); err != nil {
 		return err
 	}
@@ -473,10 +545,10 @@ func (s *Stream) SetDeadline(t time.Time) error {
 }
 
 // session closes
-func (s *Stream) sessionClose() { s.dieOnce.Do(func() { close(s.die) }) }
+func (s *stream) sessionClose() { s.dieOnce.Do(func() { close(s.die) }) }
 
 // LocalAddr satisfies net.Conn interface
-func (s *Stream) LocalAddr() net.Addr {
+func (s *stream) LocalAddr() net.Addr {
 	if ts, ok := s.sess.conn.(interface {
 		LocalAddr() net.Addr
 	}); ok {
@@ -486,7 +558,7 @@ func (s *Stream) LocalAddr() net.Addr {
 }
 
 // RemoteAddr satisfies net.Conn interface
-func (s *Stream) RemoteAddr() net.Addr {
+func (s *stream) RemoteAddr() net.Addr {
 	if ts, ok := s.sess.conn.(interface {
 		RemoteAddr() net.Addr
 	}); ok {
@@ -496,7 +568,7 @@ func (s *Stream) RemoteAddr() net.Addr {
 }
 
 // pushBytes append buf to buffers
-func (s *Stream) pushBytes(buf []byte) (written int, err error) {
+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)
@@ -505,7 +577,7 @@ func (s *Stream) pushBytes(buf []byte) (written int, err error) {
 }
 
 // recycleTokens transform remaining bytes to tokens(will truncate buffer)
-func (s *Stream) recycleTokens() (n int) {
+func (s *stream) recycleTokens() (n int) {
 	s.bufferLock.Lock()
 	for k := range s.buffers {
 		n += len(s.buffers[k])
@@ -518,7 +590,7 @@ func (s *Stream) recycleTokens() (n int) {
 }
 
 // notify read event
-func (s *Stream) notifyReadEvent() {
+func (s *stream) notifyReadEvent() {
 	select {
 	case s.chReadEvent <- struct{}{}:
 	default:
@@ -526,7 +598,7 @@ func (s *Stream) notifyReadEvent() {
 }
 
 // update command
-func (s *Stream) update(consumed uint32, window uint32) {
+func (s *stream) update(consumed uint32, window uint32) {
 	atomic.StoreUint32(&s.peerConsumed, consumed)
 	atomic.StoreUint32(&s.peerWindow, window)
 	select {
@@ -536,7 +608,7 @@ func (s *Stream) update(consumed uint32, window uint32) {
 }
 
 // mark this stream has been closed in protocol
-func (s *Stream) fin() {
+func (s *stream) fin() {
 	s.finEventOnce.Do(func() {
 		close(s.chFinEvent)
 	})

proxy/direct.go

@@ -139,7 +139,10 @@ func init() {
 Direct scheme:
   direct://
 
-Only needed when you want to load balance multiple interfaces directly:
+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:

proxy/http/client.go

@@ -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
 	}

proxy/obfs/tls.go

@@ -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
+		end := min(i+chunkSize, n)
-		if end > n {
-			end = n
-		}
 
 		buf.Write([]byte{0x17, 0x03, 0x03})
 		binary.Write(buf, binary.BigEndian, uint16(len(b[i:end])))

proxy/redir/redir_linux.go

@@ -60,7 +60,7 @@ func (s *RedirProxy) ListenAndServe() {
 		return
 	}
 
-	log.F("[redir] listening TCP on " + s.addr)
+	log.F("[redir] listening TCP on %s", s.addr)
 
 	for {
 		c, err := l.Accept()

proxy/ss/server.go

@@ -59,7 +59,7 @@ func (s *SS) Serve(c net.Conn) {
 
 	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
 	}

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"

proxy/ssr/internal/client.go

@@ -8,9 +8,7 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"math/rand"
 	"net"
-	"time"
 
 	"github.com/nadoo/glider/pkg/pool"
 	"github.com/nadoo/glider/proxy"
@@ -21,10 +19,6 @@ import (
 
 var bufSize = proxy.TCPBufSize
 
-func init() {
-	rand.Seed(time.Now().UnixNano())
-}
-
 // SSTCPConn the struct that override the net.Conn methods
 type SSTCPConn struct {
 	net.Conn

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
@@ -80,14 +80,14 @@ func (t *httpSimplePost) GetData() any {
 func (t *httpSimplePost) boundary() (ret string) {
 
 	set := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
-	for i := 0; i < 32; i++ {
+	for range 32 {
-		ret = fmt.Sprintf("%s%c", ret, set[rand.Intn(len(set))])
+		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/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"
 )
@@ -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"
 
@@ -64,7 +65,7 @@ func (t *tls12TicketAuth) GetData() any {
 		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)
@@ -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"
@@ -74,15 +75,14 @@ func (a *authAES128) GetData() any {
 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"
@@ -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"
@@ -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)

proxy/ssr/internal/ssr/crc32.go

@@ -11,7 +11,7 @@ func init() {
 }
 
 func createCRC32Table() {
-	for i := 0; i < 256; i++ {
+	for i := range 256 {
 		crc := uint32(i)
 		for j := 8; j > 0; j-- {
 			if crc&1 == 1 {

proxy/ssr/internal/tools/obfsutil.go

@@ -37,7 +37,7 @@ func (ctx *Shift128plusContext) InitFromBinDatalen(bin []byte, datalen int) {
 	ctx.v[0] = binary.LittleEndian.Uint64(fillBin[:8])
 	ctx.v[1] = binary.LittleEndian.Uint64(fillBin[8:])
 
-	for i := 0; i < 4; i++ {
+	for range 4 {
 		ctx.Next()
 	}
 }

proxy/tproxy/server.go

@@ -1,3 +1,5 @@
+//go:build linux
+
 package tproxy
 
 import (

proxy/tproxy/tproxy.go

@@ -1,3 +1,5 @@
+//go:build linux
+
 package tproxy
 
 import (

proxy/vmess/client.go

@@ -5,13 +5,14 @@ import (
 	"crypto/cipher"
 	"crypto/hmac"
 	"crypto/md5"
+	crand "crypto/rand"
 	"crypto/sha256"
 	"encoding/binary"
 	"errors"
 	"fmt"
 	"hash/fnv"
 	"io"
-	"math/rand"
+	"math/rand/v2"
 	"net"
 	"runtime"
 	"strings"
@@ -116,15 +117,12 @@ func NewClient(uuidStr, security string, alterID int, aead bool) (*Client, error
 		return nil, errors.New("unknown security type: " + security)
 	}
 
-	// NOTE: give rand a new seed to avoid the same sequence of values
-	rand.Seed(time.Now().UnixNano())
-
 	return c, nil
 }
 
 // NewConn returns a new vmess conn.
 func (c *Client) NewConn(rc net.Conn, target string, cmd CmdType) (*Conn, error) {
-	r := rand.Intn(c.count)
+	r := rand.IntN(c.count)
 	conn := &Conn{user: c.users[r], opt: c.opt, aead: c.aead, security: c.security, Conn: rc}
 
 	var err error
@@ -134,12 +132,12 @@ func (c *Client) NewConn(rc net.Conn, target string, cmd CmdType) (*Conn, error)
 	}
 
 	randBytes := pool.GetBuffer(32)
-	rand.Read(randBytes)
+	crand.Read(randBytes)
 	copy(conn.reqBodyIV[:], randBytes[:16])
 	copy(conn.reqBodyKey[:], randBytes[16:32])
 	pool.PutBuffer(randBytes)
 
-	conn.reqRespV = byte(rand.Intn(1 << 8))
+	conn.reqRespV = byte(rand.IntN(1 << 8))
 
 	if conn.aead {
 		bodyIV := sha256.Sum256(conn.reqBodyIV[:])
@@ -195,7 +193,7 @@ func (c *Conn) Request(cmd CmdType) error {
 	buf.WriteByte(c.opt)       // Opt
 
 	// pLen and Sec
-	paddingLen := rand.Intn(16)
+	paddingLen := rand.IntN(16)
 	pSec := byte(paddingLen<<4) | c.security // P(4bit) and Sec(4bit)
 	buf.WriteByte(pSec)
 
@@ -210,7 +208,7 @@ func (c *Conn) Request(cmd CmdType) error {
 	// padding
 	if paddingLen > 0 {
 		padding := pool.GetBuffer(paddingLen)
-		rand.Read(padding)
+		crand.Read(padding)
 		buf.Write(padding)
 		pool.PutBuffer(padding)
 	}

proxy/vmess/user.go

@@ -43,7 +43,7 @@ func nextID(oldID [16]byte) (newID [16]byte) {
 func (u *User) GenAlterIDUsers(alterID int) []*User {
 	users := make([]*User, alterID)
 	preID := u.UUID
-	for i := 0; i < alterID; i++ {
+	for i := range alterID {
 		newID := nextID(preID)
 		// NOTE: alterID user is a user which have a different uuid but a same cmdkey with the primary user.
 		users[i] = &User{UUID: newID, CmdKey: u.CmdKey}

proxy/vsock/client.go

@@ -1,3 +1,5 @@
+//go:build linux
+
 package vsock
 
 import (

proxy/vsock/server.go

@@ -1,3 +1,5 @@
+//go:build linux
+
 package vsock
 
 import (

proxy/vsock/socket.go

@@ -1,6 +1,7 @@
+//go:build linux
+
 // Source code from:
 // https://github.com/linuxkit/virtsock/tree/master/pkg/vsock
-
 package vsock
 
 import (

proxy/vsock/vsock.go

@@ -1,3 +1,5 @@
+//go:build linux
+
 package vsock
 
 import (

proxy/ws/frame.go

@@ -25,7 +25,7 @@ package ws
 import (
 	"encoding/binary"
 	"io"
-	"math/rand"
+	"math/rand/v2"
 	"net"
 
 	"github.com/nadoo/glider/pkg/pool"
@@ -93,7 +93,7 @@ func (w *frameWriter) Write(b []byte) (int, error) {
 	defer pool.PutBuffer(payload)
 
 	// payload with mask
-	for i := 0; i < nPayload; i++ {
+	for i := range nPayload {
 		payload[i] = b[i] ^ w.maskKey[i%4]
 	}
 

rule/group.go

@@ -225,7 +225,7 @@ func (p *FwdrGroup) Check() {
 
 	log.F("[group] %s: using check config: %s", p.name, p.config.Check)
 
-	for i := 0; i < len(p.fwdrs); i++ {
+	for i := range p.fwdrs {
 		go p.check(p.fwdrs[i], checker)
 	}
 }

service/dhcpd/cilent.go

@@ -1,3 +1,5 @@
+//go:build linux
+
 package dhcpd
 
 import (

service/dhcpd/dhcpd.go

@@ -1,3 +1,5 @@
+//go:build linux
+
 package dhcpd
 
 import (
@@ -126,58 +128,69 @@ func (d *dhcpd) handleDHCP(serverIP net.IP, mask net.IPMask, pool *Pool) server4
 			return
 		}
 
+		var reqIP netip.Addr
 		var reqType, replyType dhcpv4.MessageType
-		switch reqType = m.MessageType(); reqType {
+
+		reqType = m.MessageType()
+		log.F("[dpcpd] %s: %s from %v(%v)", d.name, reqType, m.ClientHWAddr, m.ClientIPAddr)
+
+		switch reqType {
 		case dhcpv4.MessageTypeDiscover:
 			replyType = dhcpv4.MessageTypeOffer
-		case dhcpv4.MessageTypeRequest, dhcpv4.MessageTypeInform:
+		case dhcpv4.MessageTypeInform:
 			replyType = dhcpv4.MessageTypeAck
-		case dhcpv4.MessageTypeRelease:
+		case dhcpv4.MessageTypeRequest:
+			replyType = dhcpv4.MessageTypeAck
+			if m.Options.Has(dhcpv4.OptionRequestedIPAddress) {
+				reqIP, _ = netip.AddrFromSlice(m.Options.Get(dhcpv4.OptionRequestedIPAddress))
+			} else {
+				// client uses Unicast to renew ip address lease, just take client ip
+				reqIP = netip.AddrFrom4([4]byte(m.ClientIPAddr.To4()))
+			}
+		case dhcpv4.MessageTypeRelease, dhcpv4.MessageTypeDecline:
 			pool.ReleaseIP(m.ClientHWAddr)
-			log.F("[dpcpd] %s:%v released ip %v", d.name, m.ClientHWAddr, m.ClientIPAddr)
-			return
-		case dhcpv4.MessageTypeDecline:
-			pool.ReleaseIP(m.ClientHWAddr)
-			log.F("[dpcpd] %s: received decline message from %v", d.name, m.ClientHWAddr)
 			return
 		default:
-			log.F("[dpcpd] %s: can't handle type %v", d.name, reqType)
+			log.F("[dpcpd] %s: can't handle type %v from %v", d.name, reqType, m.ClientHWAddr)
 			return
 		}
 
-		replyIP, err := pool.LeaseIP(m.ClientHWAddr)
+		replyIP, err := pool.LeaseIP(m.ClientHWAddr, reqIP)
 		if err != nil {
-			log.F("[dpcpd] %s: can not assign IP, error %s", d.name, err)
+			log.F("[dpcpd] %s: can not assign IP for %v, error: %s", d.name, m.ClientHWAddr, err)
 			return
 		}
 
-		reply, err := dhcpv4.NewReplyFromRequest(m,
+		if reqType == dhcpv4.MessageTypeRequest && !reqIP.IsUnspecified() && reqIP != replyIP {
+			replyType = dhcpv4.MessageTypeNak
+		}
+
+		resp, err := dhcpv4.NewReplyFromRequest(m,
 			dhcpv4.WithMessageType(replyType),
-			dhcpv4.WithServerIP(serverIP),
 			dhcpv4.WithNetmask(mask),
 			dhcpv4.WithYourIP(replyIP.AsSlice()),
 			dhcpv4.WithRouter(serverIP),
 			dhcpv4.WithDNS(serverIP),
-			// RFC 2131, Section 4.3.1. Server Identifier: MUST
+			dhcpv4.WithServerIP(serverIP), //
-			dhcpv4.WithOption(dhcpv4.OptServerIdentifier(serverIP)),
 			// RFC 2131, Section 4.3.1. IP lease time: MUST
 			dhcpv4.WithOption(dhcpv4.OptIPAddressLeaseTime(d.lease)),
+			// RFC 2131, Section 4.3.1. Server Identifier: MUST
+			dhcpv4.WithOption(dhcpv4.OptServerIdentifier(serverIP)),
 		)
 		if err != nil {
-			log.F("[dpcpd] %s: can not create reply message, error %s", d.name, err)
+			log.F("[dpcpd] %s: can not create reply message, error: %s", d.name, err)
 			return
 		}
 
-		if val := m.Options.Get(dhcpv4.OptionClientIdentifier); len(val) > 0 {
+		if err := reply(d.iface, resp); err != nil {
-			reply.UpdateOption(dhcpv4.OptGeneric(dhcpv4.OptionClientIdentifier, val))
+			log.F("[dpcpd] %s: could not write to %v(%v): %s",
-		}
+				d.name, resp.ClientHWAddr, peer, err)
-
-		if _, err := conn.WriteTo(reply.ToBytes(), peer); err != nil {
-			log.F("[dpcpd] %s: could not write to client %s(%s): %s", d.name, peer, reply.ClientHWAddr, err)
 			return
 		}
 
-		log.F("[dpcpd] %s: lease %v to client %v", d.name, replyIP, reply.ClientHWAddr)
+		log.F("[dpcpd] %s: %s to %v for %v",
+			d.name, replyType, resp.ClientHWAddr, replyIP)
+
 	}
 }
 

service/dhcpd/pool.go

@@ -1,9 +1,11 @@
+//go:build linux
+
 package dhcpd
 
 import (
 	"bytes"
 	"errors"
-	"math/rand"
+	"math/rand/v2"
 	"net"
 	"net/netip"
 	"sync"
@@ -38,13 +40,12 @@ func NewPool(lease time.Duration, start, end netip.Addr) (*Pool, error) {
 	for n := s; n <= e; n++ {
 		items = append(items, &item{ip: numToIPv4(n)})
 	}
-	rand.Seed(time.Now().Unix())
 
 	p := &Pool{items: items, lease: lease}
 	go func() {
 		for now := range time.Tick(time.Second) {
 			p.mutex.Lock()
-			for i := 0; i < len(items); i++ {
+			for i := range len(items) {
 				if !items[i].expire.IsZero() && now.After(items[i].expire) {
 					items[i].mac = nil
 					items[i].expire = time.Time{}
@@ -58,17 +59,31 @@ func NewPool(lease time.Duration, start, end netip.Addr) (*Pool, error) {
 }
 
 // LeaseIP leases an ip to mac from dhcp pool.
-func (p *Pool) LeaseIP(mac net.HardwareAddr) (netip.Addr, error) {
+func (p *Pool) LeaseIP(mac net.HardwareAddr, ip netip.Addr) (netip.Addr, error) {
 	p.mutex.Lock()
 	defer p.mutex.Unlock()
 
+	// static ip and leased ip
 	for _, item := range p.items {
 		if bytes.Equal(mac, item.mac) {
+			if !item.expire.IsZero() {
+				item.expire = time.Now().Add(p.lease)
+			}
 			return item.ip, nil
 		}
 	}
 
-	idx := rand.Intn(len(p.items))
+	// requested ip
+	for _, item := range p.items {
+		if item.ip == ip && item.mac == nil {
+			item.mac = mac
+			item.expire = time.Now().Add(p.lease)
+			return item.ip, nil
+		}
+	}
+
+	// lease new ip
+	idx := rand.IntN(len(p.items))
 	for _, item := range p.items[idx:] {
 		if item.mac == nil {
 			item.mac = mac
@@ -96,7 +111,7 @@ func (p *Pool) LeaseStaticIP(mac net.HardwareAddr, ip netip.Addr) {
 	for _, item := range p.items {
 		if item.ip == ip {
 			item.mac = mac
-			item.expire = time.Now().Add(time.Hour * 24 * 365 * 50) // 50 years
+			item.expire = time.Time{}
 		}
 	}
 }
@@ -107,7 +122,8 @@ func (p *Pool) ReleaseIP(mac net.HardwareAddr) {
 	defer p.mutex.Unlock()
 
 	for _, item := range p.items {
-		if bytes.Equal(mac, item.mac) {
+		// not static ip
+		if !item.expire.IsZero() && bytes.Equal(mac, item.mac) {
 			item.mac = nil
 			item.expire = time.Time{}
 		}

service/dhcpd/reply.go

@@ -0,0 +1,86 @@
+//go:build linux
+
+package dhcpd
+
+import (
+	"encoding/binary"
+	"fmt"
+	"net"
+	"syscall"
+
+	"github.com/insomniacslk/dhcp/dhcpv4"
+
+	"github.com/nadoo/glider/pkg/log"
+)
+
+func reply(iface *net.Interface, resp *dhcpv4.DHCPv4) error {
+	p := [590]byte{12: 0x08, //ethernet layer: 14 bytes
+		14: 0x45, 16: 0x02, 17: 0x40, 22: 0x40, 23: 0x11, //ip layer: 20 bytes
+		35: 67, 37: 68, 38: 0x02, 39: 0x2c, //udp layer: 8 bytes
+	}
+
+	copy(p[0:], resp.ClientHWAddr[0:6])
+	copy(p[6:], iface.HardwareAddr[0:6])
+	copy(p[26:], resp.ServerIPAddr[0:4])
+	copy(p[30:], resp.YourIPAddr[0:4])
+
+	// ip layer checksum
+	checksum := checksum(p[14:34])
+	binary.BigEndian.PutUint16(p[24:], checksum)
+
+	// dhcp payload
+	copy(p[42:], resp.ToBytes())
+
+	// udp layer checksum, set to zero
+	// https://datatracker.ietf.org/doc/html/rfc768
+	// An all zero transmitted checksum  value means that the transmitter generated no
+	// checksum (for debugging or for higher level protocols that don't care).
+
+	fd, err := syscall.Socket(syscall.AF_PACKET, syscall.SOCK_RAW, 0)
+	if err != nil {
+		return fmt.Errorf("cannot open socket: %v", err)
+	}
+	defer func() {
+		err = syscall.Close(fd)
+		if err != nil {
+			log.F("dhcpd: cannot close socket: %v", err)
+		}
+	}()
+
+	err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
+	if err != nil {
+		log.F("dhcpd: cannot set option for socket: %v", err)
+	}
+
+	var hwAddr [8]byte
+	copy(hwAddr[0:6], resp.ClientHWAddr[0:6])
+	ethAddr := syscall.SockaddrLinklayer{
+		Protocol: 0,
+		Ifindex:  iface.Index,
+		Halen:    6,
+		Addr:     hwAddr,
+	}
+	err = syscall.Sendto(fd, p[:], 0, &ethAddr)
+	if err != nil {
+		return fmt.Errorf("cannot send frame via socket: %v", err)
+	}
+	return nil
+}
+
+func checksum(bytes []byte) uint16 {
+	var csum uint32
+	for i := 0; i < len(bytes); i += 2 {
+		csum += uint32(bytes[i]) << 8
+		csum += uint32(bytes[i+1])
+	}
+	for {
+		// Break when sum is less or equals to 0xFFFF
+		if csum <= 65535 {
+			break
+		}
+		// Add carry to the sum
+		csum = (csum >> 16) + uint32(uint16(csum))
+	}
+	// Flip all the bits
+	return ^uint16(csum)
+}

systemd/postinstall.sh

@@ -2,6 +2,10 @@
 
 set -e
 
+if test ! -f "/etc/glider/glider.conf"; then
+    cp /etc/glider/glider.conf.example /etc/glider/glider.conf
+fi
+
 /bin/systemctl daemon-reload
 
 if /bin/systemctl is-active --quiet glider@glider; then