2025-04-21 11:42:08 +08:00
56 changed files with 1678 additions and 690 deletions
--- a/.Dockerfile
+++ b/.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_sse2'; \
+            export FOLDER='default_linux_386'; \
            ;; \
        'linux/amd64') \
            export FOLDER='default_linux_amd64_v1'; \
@ -19,10 +19,10 @@ RUN case $TARGETPLATFORM in \
            export FOLDER='default_linux_arm_7'; \
            ;; \
        'linux/arm64') \
-            export FOLDER='default_linux_arm64_v8.0'; \
+            export FOLDER='default_linux_arm64'; \
            ;; \
        'linux/riscv64') \
-            export FOLDER='default_linux_riscv64_rva20u64'; \
+            export FOLDER='default_linux_riscv64'; \
            ;; \
        *) echo >&2 "error: unsupported architecture '$TARGETPLATFORM'"; exit 1 ;; \
    esac \
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@ -2,9 +2,9 @@ name: Build
 on:
  push:
    branches:
-      - "dev"
+      - 'dev'
    tags:
-      - "*"
+      - '*'
  pull_request:

 env:
@ -19,7 +19,7 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3
        with:
          fetch-depth: 0

@ -28,54 +28,77 @@ jobs:
          echo "SHA_SHORT=$(git rev-parse --short HEAD)" >> $GITHUB_ENV

      - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v3
        with:
          check-latest: true
-          go-version-file: "go.mod"
+          go-version-file: 'go.mod'
          cache: true

      - name: Test
-        run: go test -v ./...
+        run: go test -v .

      - name: Build
-        uses: goreleaser/goreleaser-action@v6
+        uses: goreleaser/goreleaser-action@v4
        if: "!startsWith(github.ref, 'refs/tags/')"
        with:
-          args: build --snapshot --clean
+          version: latest
+          args: build --snapshot --rm-dist
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

-      - name: Upload Artifacts
-        uses: actions/upload-artifact@v4
+      - name: Upload Artifact - Linux amd64
+        uses: actions/upload-artifact@v3
        if: "!startsWith(github.ref, 'refs/tags/')"
        with:
-          name: ${{ env.APP_NAME }}-dev-${{ env.SHA_SHORT }}
+          name: ${{ env.APP_NAME }}-dev-${{ env.SHA_SHORT }}-linux-amd64
          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@v6
+        uses: goreleaser/goreleaser-action@v4
        if: startsWith(github.ref, 'refs/tags/')
        with:
-          args: release --clean
+          version: latest
+          args: release --rm-dist
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Docker - Set up Buildx
        id: buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v2

      - name: Docker - Login to DockerHub
-        uses: docker/login-action@v3
+        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Docker - Login to GHCR
-        uses: docker/login-action@v3
+        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
@ -83,7 +106,7 @@ jobs:

      - name: Docker - Docker meta
        id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v4
        with:
          images: |
            ${{ env.DOCKERHUB_REPO }}
@ -94,10 +117,11 @@ jobs:
            type=semver,pattern={{major}}.{{minor}}

      - name: Docker - Build and push
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v4
        with:
          context: .
          file: .Dockerfile
          platforms: ${{ env.PLATFORMS }}
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
+          
--- a/.github/workflows/stale.yml
+++ b/.github/workflows/stale.yml
@ -7,7 +7,7 @@ jobs:
  stale:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/stale@v9
+      - uses: actions/stale@v5
        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
--- a/.gitignore
+++ b/.gitignore
@ -17,14 +17,12 @@
 # custom
 .idea
 .vscode
-.zed
 .DS_Store

 # dev test only
 /dev/
 dev*.go

-*_test.go

 dist

--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@ -1,5 +1,3 @@
-version: 2
-
 before:
  hooks:
    - go mod tidy
@ -37,11 +35,13 @@ archives:
  - id: default
    builds:
      - default
+    replacements:
+      darwin: macos
    wrap_in_directory: true
-    formats: tar.gz
+    format: tar.gz
    format_overrides:
      - goos: windows
-        formats: zip
+        format: zip
    files:
      - LICENSE
      - README.md
@ -49,7 +49,7 @@ archives:
      - systemd/*

 snapshot:
-  version_template: '{{ incpatch .Version }}-dev-{{.ShortCommit}}'
+  name_template: '{{ incpatch .Version }}-dev-{{.ShortCommit}}'

 checksum:
  name_template: "{{ .ProjectName }}_{{ .Version }}_checksums.txt"
--- a/2
+++ b/2
@ -1,5 +1,5 @@
 # Build Stage
-FROM golang:1.24-alpine AS build-env
+FROM golang:1.20-alpine AS build-env
 ADD . /src
 RUN apk --no-cache add git \
    && cd /src && go build -v -ldflags "-s -w"
--- a/README.md
+++ b/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/actions/workflow/status/nadoo/glider/build.yml?branch=dev&style=flat-square)](https://github.com/nadoo/glider/actions)
+[![Actions Status](https://img.shields.io/github/actions/workflow/status/nadoo/glider/build.yml?branch=master&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 +82,6 @@ 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`
@ -224,7 +223,7 @@ Help:

 see README.md and glider.conf.example for more details.
 --
-glider 0.16.4, https://github.com/nadoo/glider (glider.proxy@gmail.com)
+glider 0.16.1, https://github.com/nadoo/glider (glider.proxy@gmail.com)
 ```

 </details>
@ -238,10 +237,7 @@ glider 0.16.4, https://github.com/nadoo/glider (glider.proxy@gmail.com)
 Direct scheme:
  direct://

-Only needed when you want to specify the outgoing interface:
-  glider -verbose -listen :8443 -forward direct://#interface=eth0
-
-Or load balance multiple interfaces directly:
+Only needed when you want to 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:
@ -444,7 +440,7 @@ glider -config CONFIG_PATH

 ## Linux Daemon

- systemd: [https://github.com/nadoo/glider/tree/main/systemd](https://github.com/nadoo/glider/tree/main/systemd)
+- systemd: [https://github.com/nadoo/glider/blob/master/systemd/](https://github.com/nadoo/glider/blob/master/systemd/)

 - <details> <summary>docker: click to see details</summary>

@ -486,7 +482,7 @@ glider -config CONFIG_PATH
  // _ "github.com/nadoo/glider/proxy/kcp"
  ```

-3. Build it:
+3. Build it(requires **Go 1.20+** )
  ```bash
  go build -v -ldflags "-s -w"
  ```
@ -538,5 +534,5 @@ 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://archlinux.org/packages/extra/x86_64/glider): a great linux distribution with glider pre-built package.
+- [ArchLinux](https://www.archlinux.org/packages/community/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`
--- a/config.go
+++ b/config.go
@ -99,12 +99,12 @@ check=disable: disable health check`)
 	}

 	if *scheme != "" {
-		fmt.Fprint(flag.Output(), proxy.Usage(*scheme))
+		fmt.Fprintf(flag.Output(), proxy.Usage(*scheme))
 		os.Exit(0)
 	}

 	if *example {
-		fmt.Fprint(flag.Output(), examples)
+		fmt.Fprintf(flag.Output(), examples)
 		os.Exit(0)
 	}

--- a/config/README.md
+++ b/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 forward strategy
+# multiple upstream proxies forwad strategy
 strategy=rr

 # forwarder health check
--- a/config/glider.conf.example
+++ b/config/glider.conf.example
@ -32,17 +32,16 @@ verbose=True
 # different protocols.

 # listen on 8443, serve as http/socks5 proxy on the same port.
-# listen=:8443
-listen=127.0.0.1:8443
+listen=: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
@ -80,10 +79,10 @@ listen=127.0.0.1:8443
 # 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
 # ----------
@ -140,7 +139,7 @@ listen=127.0.0.1:8443
 # 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
@ -223,7 +222,7 @@ 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
@ -280,7 +279,7 @@ 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
--- a/dns/client.go
+++ b/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 range ups.Len() {
+	for i := 0; i < ups.Len(); i++ {
 		var rc net.Conn
 		rc, err = dialer.Dial(network, server)
 		if err != nil {
--- a/dns/message.go
+++ b/dns/message.go
@ -5,14 +5,17 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
-	"math/rand/v2"
+	"math/rand"
 	"net/netip"
 	"strings"
 )

 // UDPMaxLen is the max size of udp dns request.
-// https://www.dnsflagday.net/2020/
-const UDPMaxLen = 1232
+// https://www.rfc-editor.org/rfc/rfc1035#section-4.2.1
+// Messages carried by UDP are restricted to 512 bytes (not counting the IP
+// or UDP headers).  Longer messages are truncated and the TC bit is set in
+// the header.
+const UDPMaxLen = 512

 // HeaderLen is the length of dns msg header.
 const HeaderLen = 12
@ -146,7 +149,7 @@ func UnmarshalMessage(b []byte) (*Message, error) {

 	// resp answers
 	rrIdx := HeaderLen + qLen
-	for range int(m.Header.ANCOUNT) {
+	for i := 0; i < int(m.Header.ANCOUNT); i++ {
 		rr := &RR{}
 		rrLen, err := m.UnmarshalRR(rrIdx, rr)
 		if err != nil {
@ -181,6 +184,7 @@ func UnmarshalMessage(b []byte) (*Message, error) {
 //     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //     |                    ARCOUNT                    |
 //     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+//
 type Header struct {
 	ID      uint16
 	Bits    uint16
@ -210,11 +214,10 @@ func (h *Header) SetAncount(ancount int) {
 	h.ANCOUNT = uint16(ancount)
 }

-// Not used now, but keep it for future use.
-// func (h *Header) setFlag(QR uint16, Opcode uint16, AA uint16,
-// 	TC uint16, RD uint16, RA uint16, RCODE uint16) {
-// 	h.Bits = QR<<15 + Opcode<<11 + AA<<10 + TC<<9 + RD<<8 + RA<<7 + RCODE
-// }
+func (h *Header) setFlag(QR uint16, Opcode uint16, AA uint16,
+	TC uint16, RD uint16, RA uint16, RCODE uint16) {
+	h.Bits = QR<<15 + Opcode<<11 + AA<<10 + TC<<9 + RD<<8 + RA<<7 + RCODE
+}

 // MarshalTo marshals header struct to []byte and write to w.
 func (h *Header) MarshalTo(w io.Writer) (int, error) {
--- a/go.mod
+++ b/go.mod
@ -1,29 +1,38 @@
 module github.com/nadoo/glider

-go 1.24
+go 1.20

 require (
 	github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da
 	github.com/dgryski/go-camellia v0.0.0-20191119043421-69a8a13fb23d
 	github.com/dgryski/go-idea v0.0.0-20170306091226-d2fb45a411fb
 	github.com/dgryski/go-rc2 v0.0.0-20150621095337-8a9021637152
-	github.com/insomniacslk/dhcp v0.0.0-20250109001534-8abf58130905
+	github.com/insomniacslk/dhcp v0.0.0-20230307103557-e252950ab961
 	github.com/nadoo/conflag v0.3.1
 	github.com/nadoo/ipset v0.5.0
-	github.com/xtaci/kcp-go/v5 v5.6.18
-	golang.org/x/crypto v0.35.0
-	golang.org/x/sys v0.30.0
+	github.com/xtaci/kcp-go/v5 v5.6.2
+	golang.org/x/crypto v0.7.0
+	golang.org/x/sys v0.6.0
 )

 require (
 	github.com/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.10 // indirect
-	github.com/klauspost/reedsolomon v1.12.4 // indirect
-	github.com/pierrec/lz4/v4 v4.1.22 // indirect
+	github.com/josharian/native v1.1.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
+	github.com/klauspost/reedsolomon v1.11.7 // indirect
+	github.com/mdlayher/ethernet v0.0.0-20220221185849-529eae5b6118 // indirect
+	github.com/mdlayher/raw v0.1.0 // indirect
+	github.com/pierrec/lz4/v4 v4.1.17 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/templexxx/cpu v0.1.1 // indirect
-	github.com/templexxx/xorsimd v0.4.3 // indirect
+	github.com/templexxx/cpu v0.1.0 // indirect
+	github.com/templexxx/xorsimd v0.4.2 // indirect
 	github.com/tjfoc/gmsm v1.4.1 // indirect
-	github.com/u-root/uio v0.0.0-20240224005618-d2acac8f3701 // indirect
-	golang.org/x/net v0.35.0 // indirect
+	github.com/u-root/uio v0.0.0-20230305220412-3e8cd9d6bf63 // indirect
+	golang.org/x/net v0.8.0 // 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
+// )
--- a/go.sum
+++ b/go.sum
@ -33,48 +33,64 @@ 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/insomniacslk/dhcp v0.0.0-20250109001534-8abf58130905 h1:q3OEI9RaN/wwcx+qgGo6ZaoJkCiDYe/gjDLfq7lQQF4=
-github.com/insomniacslk/dhcp v0.0.0-20250109001534-8abf58130905/go.mod h1:VvGYjkZoJyKqlmT1yzakUs4mfKMNB0XdODP0+rdml6k=
+github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
+github.com/insomniacslk/dhcp v0.0.0-20230307103557-e252950ab961 h1:x/YtdDlmypenG1te/FfH6LVM+3krhXk5CFV8VYNNX5M=
+github.com/insomniacslk/dhcp v0.0.0-20230307103557-e252950ab961/go.mod h1:IKrnDWs3/Mqq5n0lI+RxA2sB7MvN/vbMBP3ehXg65UI=
+github.com/josharian/native v1.0.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
+github.com/josharian/native v1.0.1-0.20221213033349-c1e37c09b531/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
 github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtLA=
 github.com/josharian/native v1.1.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
-github.com/klauspost/cpuid/v2 v2.2.10 h1:tBs3QSyvjDyFTq3uoc/9xFpCuOsJQFNPiAhYdw2skhE=
-github.com/klauspost/cpuid/v2 v2.2.10/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
-github.com/klauspost/reedsolomon v1.12.4 h1:5aDr3ZGoJbgu/8+j45KtUJxzYm8k08JGtB9Wx1VQ4OA=
-github.com/klauspost/reedsolomon v1.12.4/go.mod h1:d3CzOMOt0JXGIFZm1StgkyF14EYr3xneR2rNWo7NcMU=
-github.com/mdlayher/packet v1.1.2 h1:3Up1NG6LZrsgDVn6X4L9Ge/iyRyxFEFD9o6Pr3Q1nQY=
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@ -123,7 +155,8 @@ google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQ
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+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 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=
--- a/main.go
+++ b/main.go
@ -17,7 +17,7 @@ import (
 )

 var (
-	version = "0.17.0"
+	version = "0.16.3"
 	config  = parseConfig()
 )

--- a/pkg/pool/buffer.go
+++ b/pkg/pool/buffer.go
@ -3,7 +3,6 @@ package pool
 import (
 	"math/bits"
 	"sync"
-	"unsafe"
 )

 const (
@ -18,12 +17,11 @@ var (
 )

 func init() {
-	for i := range num {
+	for i := 0; i < num; i++ {
 		size := 1 << i
 		sizes[i] = size
 		pools[i].New = func() any {
-			buf := make([]byte, size)
-			return unsafe.SliceData(buf)
+			return make([]byte, size)
 		}
 	}
 }
@ -32,10 +30,11 @@ func init() {
 // otherwise, this function will call make([]byte, size) directly.
 func GetBuffer(size int) []byte {
 	if size >= 1 && size <= maxsize {
-		i := bits.Len32(uint32(size - 1))
-		if p := pools[i].Get().(*byte); p != nil {
-			return unsafe.Slice(p, 1<<i)[:size]
+		i := bits.Len32(uint32(size)) - 1
+		if sizes[i] < size {
+			i += 1
 		}
+		return pools[i].Get().([]byte)[:size]
 	}
 	return make([]byte, size)
 }
@ -43,9 +42,9 @@ 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(unsafe.SliceData(buf))
+			pools[i].Put(buf)
 		}
 	}
 }
--- a/pkg/smux/LICENSE
+++ b/pkg/smux/LICENSE
@ -0,0 +1,21 @@
+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.
--- a/pkg/smux/frame.go
+++ b/pkg/smux/frame.go
@ -1,25 +1,3 @@
-// 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 (
@ -60,18 +38,16 @@ const (

 // Frame defines a packet from or to be multiplexed into a single connection
 type Frame struct {
-	ver  byte   // version
-	cmd  byte   // command
-	sid  uint32 // stream id
-	data []byte // payload
+	ver  byte
+	cmd  byte
+	sid  uint32
+	data []byte
 }

-// 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 {
@ -95,7 +71,6 @@ 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 {
--- a/pkg/smux/mux.go
+++ b/pkg/smux/mux.go
@ -1,25 +1,7 @@
-// MIT License
+// Package smux is a multiplexing library for Golang.
 //
-// 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.
-
+// It relies on an underlying connection to provide reliability and ordering, such as TCP or KCP,
+// and provides stream-oriented multiplexing over a single channel.
 package smux

 import (
--- a/pkg/smux/mux_test.go
+++ b/pkg/smux/mux_test.go
@ -0,0 +1,86 @@
+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")
+	}
+}
--- a/pkg/smux/session.go
+++ b/pkg/smux/session.go
@ -1,25 +1,3 @@
-// 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 (
@ -28,7 +6,6 @@ import (
 	"errors"
 	"io"
 	"net"
-	"runtime"
 	"sync"
 	"sync/atomic"
 	"time"
@ -39,38 +16,25 @@ import (
 const (
 	defaultAcceptBacklog = 1024
 	maxShaperSize        = 1024
-	openCloseTimeout     = 30 * time.Second // Timeout for opening/closing streams
+	openCloseTimeout     = 30 * time.Second // stream open/close timeout
 )

-// CLASSID represents the class of a frame
+// define frame class
 type CLASSID int

 const (
-	CLSCTRL CLASSID = iota // prioritized control signal
+	CLSCTRL CLASSID = iota
 	CLSDATA
 )

-// timeoutError representing timeouts for operations such as accept, read and write
-//
-// To better cooperate with the standard library, timeoutError should implement the standard library's `net.Error`.
-//
-// For example, using smux to implement net.Listener and work with http.Server, the keep-alive connection (*smux.Stream) will be unexpectedly closed.
-// For more details, see https://github.com/xtaci/smux/pull/99.
-type timeoutError struct{}
-
-func (timeoutError) Error() string   { return "timeout" }
-func (timeoutError) Temporary() bool { return true }
-func (timeoutError) Timeout() bool   { return true }
-
 var (
 	ErrInvalidProtocol = errors.New("invalid protocol")
 	ErrConsumed        = errors.New("peer consumed more than sent")
 	ErrGoAway          = errors.New("stream id overflows, should start a new connection")
-	ErrTimeout         net.Error = &timeoutError{}
+	ErrTimeout         = errors.New("timeout")
 	ErrWouldBlock      = errors.New("operation would block on IO")
 )

-// writeRequest represents a request to write a frame
 type writeRequest struct {
 	class  CLASSID
 	frame  Frame
@ -78,7 +42,6 @@ type writeRequest struct {
 	result chan writeResult
 }

-// writeResult represents the result of a write request
 type writeResult struct {
 	n   int
 	err error
@ -95,7 +58,7 @@ 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
@ -114,7 +77,7 @@ type Session struct {
 	chProtoError   chan struct{}
 	protoErrorOnce sync.Once

-	chAccepts chan *stream
+	chAccepts chan *Stream

 	dataReady int32 // flag data has arrived

@ -122,7 +85,7 @@ type Session struct {

 	deadline atomic.Value

-	requestID uint32            // Monotonic increasing write request ID
+	requestID uint32            // write request monotonic increasing
 	shaper    chan writeRequest // a shaper for writing
 	writes    chan writeRequest
 }
@ -132,8 +95,8 @@ 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.chAccepts = make(chan *stream, defaultAcceptBacklog)
+	s.streams = make(map[uint32]*Stream)
+	s.chAccepts = make(chan *Stream, defaultAcceptBacklog)
 	s.bucket = int32(config.MaxReceiveBuffer)
 	s.bucketNotify = make(chan struct{}, 1)
 	s.shaper = make(chan writeRequest)
@ -181,7 +144,7 @@ func (s *Session) OpenStream() (*Stream, error) {

 	stream := newStream(sid, s.config.MaxFrameSize, s)

-	if _, err := s.writeControlFrame(newFrame(byte(s.config.Version), cmdSYN, sid)); err != nil {
+	if _, err := s.writeFrame(newFrame(byte(s.config.Version), cmdSYN, sid)); err != nil {
 		return nil, err
 	}

@ -196,14 +159,7 @@ func (s *Session) OpenStream() (*Stream, error) {
 		return nil, io.ErrClosedPipe
 	default:
 		s.streams[sid] = stream
-		wrapper := &Stream{stream: stream}
-		// NOTE(x): disabled finalizer for issue #997
-		/*
-			runtime.SetFinalizer(wrapper, func(s *Stream) {
-				s.Close()
-			})
-		*/
-		return wrapper, nil
+		return stream, nil
 	}
 }

@ -224,11 +180,7 @@ func (s *Session) AcceptStream() (*Stream, error) {

 	select {
 	case stream := <-s.chAccepts:
-		wrapper := &Stream{stream: stream}
-		runtime.SetFinalizer(wrapper, func(s *Stream) {
-			s.Close()
-		})
-		return wrapper, nil
+		return stream, nil
 	case <-deadline:
 		return nil, ErrTimeout
 	case <-s.chSocketReadError:
@ -350,15 +302,12 @@ func (s *Session) RemoteAddr() net.Addr {
 // notify the session that a stream has closed
 func (s *Session) streamClosed(sid uint32) {
 	s.streamLock.Lock()
-	if stream, ok := s.streams[sid]; ok {
-		n := stream.recycleTokens()
-		if n > 0 { // return remaining tokens to the bucket
+	if n := s.streams[sid].recycleTokens(); n > 0 { // return remaining tokens to the bucket
 		if atomic.AddInt32(&s.bucket, int32(n)) > 0 {
 			s.notifyBucket()
 		}
 	}
 	delete(s.streams, sid)
-	}
 	s.streamLock.Unlock()
 }

@ -393,7 +342,7 @@ func (s *Session) recvLoop() {
 			sid := hdr.StreamID()
 			switch hdr.Cmd() {
 			case cmdNOP:
-			case cmdSYN: // stream opening
+			case cmdSYN:
 				s.streamLock.Lock()
 				if _, ok := s.streams[sid]; !ok {
 					stream := newStream(sid, s.config.MaxFrameSize, s)
@ -404,26 +353,22 @@ func (s *Session) recvLoop() {
 					}
 				}
 				s.streamLock.Unlock()
-			case cmdFIN: // stream closing
+			case cmdFIN:
 				s.streamLock.Lock()
 				if stream, ok := s.streams[sid]; ok {
 					stream.fin()
 					stream.notifyReadEvent()
 				}
 				s.streamLock.Unlock()
-			case cmdPSH: // data frame
+			case cmdPSH:
 				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 {
@ -431,7 +376,7 @@ func (s *Session) recvLoop() {
 						return
 					}
 				}
-			case cmdUPD: // a window update signal
+			case cmdUPD:
 				if _, err := io.ReadFull(s.conn, updHdr[:]); err == nil {
 					s.streamLock.Lock()
 					if stream, ok := s.streams[sid]; ok {
@ -453,7 +398,6 @@ 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)
@ -479,8 +423,7 @@ func (s *Session) keepalive() {
 	}
 }

-// shaperLoop implements a priority queue for write requests,
-// some control messages are prioritized over data messages
+// shaper shapes the sending sequence among streams
 func (s *Session) shaperLoop() {
 	var reqs shaperHeap
 	var next writeRequest
@ -521,7 +464,6 @@ func (s *Session) shaperLoop() {
 	}
 }

-// sendLoop sends frames to the underlying connection
 func (s *Session) sendLoop() {
 	var buf []byte
 	var n int
@ -549,7 +491,6 @@ 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
@ -581,13 +522,10 @@ func (s *Session) sendLoop() {
 	}
 }

-// writeControlFrame writes the control frame to the underlying connection
+// writeFrame writes the frame to the underlying connection
 // and returns the number of bytes written if successful
-func (s *Session) writeControlFrame(f Frame) (n int, err error) {
-	timer := time.NewTimer(openCloseTimeout)
-	defer timer.Stop()
-
-	return s.writeFrameInternal(f, timer.C, CLSCTRL)
+func (s *Session) writeFrame(f Frame) (n int, err error) {
+	return s.writeFrameInternal(f, time.After(openCloseTimeout), CLSCTRL)
 }

 // internal writeFrame version to support deadline used in keepalive
--- a/pkg/smux/session_test.go
+++ b/pkg/smux/session_test.go
--- a/pkg/smux/shaper.go
+++ b/pkg/smux/shaper.go
@ -1,42 +1,12 @@
-// MIT License
-//
-// Copyright (c) 2016-2017 xtaci
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in all
-// copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-// SOFTWARE.
-
 package smux

-// _itimediff returns the time difference between two uint32 values.
-// The result is a signed 32-bit integer representing the difference between 'later' and 'earlier'.
 func _itimediff(later, earlier uint32) int32 {
 	return (int32)(later - earlier)
 }

-// shaperHeap is a min-heap of writeRequest.
-// It orders writeRequests by class first, then by sequence number within the same class.
 type shaperHeap []writeRequest

 func (h shaperHeap) Len() int { return len(h) }
-
-// Less determines the ordering of elements in the heap.
-// Requests are ordered by their class first. If two requests have the same class,
-// they are ordered by their sequence numbers.
 func (h shaperHeap) Less(i, j int) bool {
 	if h[i].class != h[j].class {
 		return h[i].class < h[j].class
--- a/pkg/smux/shaper_test.go
+++ b/pkg/smux/shaper_test.go
@ -0,0 +1,50 @@
+package smux
+
+import (
+	"container/heap"
+	"testing"
+)
+
+func TestShaper(t *testing.T) {
+	w1 := writeRequest{seq: 1}
+	w2 := writeRequest{seq: 2}
+	w3 := writeRequest{seq: 3}
+	w4 := writeRequest{seq: 4}
+	w5 := writeRequest{seq: 5}
+
+	var reqs shaperHeap
+	heap.Push(&reqs, w5)
+	heap.Push(&reqs, w4)
+	heap.Push(&reqs, w3)
+	heap.Push(&reqs, w2)
+	heap.Push(&reqs, w1)
+
+	for len(reqs) > 0 {
+		w := heap.Pop(&reqs).(writeRequest)
+		t.Log("sid:", w.frame.sid, "seq:", w.seq)
+	}
+}
+
+func TestShaper2(t *testing.T) {
+	w1 := writeRequest{class: CLSDATA, seq: 1} // stream 0
+	w2 := writeRequest{class: CLSDATA, seq: 2}
+	w3 := writeRequest{class: CLSDATA, seq: 3}
+	w4 := writeRequest{class: CLSDATA, seq: 4}
+	w5 := writeRequest{class: CLSDATA, seq: 5}
+	w6 := writeRequest{class: CLSCTRL, seq: 6, frame: Frame{sid: 10}} // ctrl 1
+	w7 := writeRequest{class: CLSCTRL, seq: 7, frame: Frame{sid: 11}} // ctrl 2
+
+	var reqs shaperHeap
+	heap.Push(&reqs, w6)
+	heap.Push(&reqs, w5)
+	heap.Push(&reqs, w4)
+	heap.Push(&reqs, w3)
+	heap.Push(&reqs, w2)
+	heap.Push(&reqs, w1)
+	heap.Push(&reqs, w7)
+
+	for len(reqs) > 0 {
+		w := heap.Pop(&reqs).(writeRequest)
+		t.Log("sid:", w.frame.sid, "seq:", w.seq)
+	}
+}
--- a/pkg/smux/stream.go
+++ b/pkg/smux/stream.go
@ -1,25 +1,3 @@
-// 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 (
@ -33,41 +11,36 @@ import (
 	"github.com/nadoo/glider/pkg/pool"
 )

-// wrapper for GC
-type Stream struct {
-	*stream
-}
-
 // Stream implements net.Conn
-type stream struct {
-	id   uint32 // Stream identifier
+type Stream struct {
+	id   uint32
 	sess *Session

-	buffers [][]byte // the sequential buffers of stream
-	heads   [][]byte // slice heads of the buffers above, kept for recycle
+	buffers [][]byte
+	heads   [][]byte // slice heads kept for recycle

-	bufferLock sync.Mutex // Mutex to protect access to buffers
-	frameSize  int        // Maximum frame size for the stream
+	bufferLock sync.Mutex
+	frameSize  int

 	// notify a read event
 	chReadEvent chan struct{}

 	// flag the stream has closed
 	die     chan struct{}
-	dieOnce sync.Once // Ensures die channel is closed only once
+	dieOnce sync.Once

 	// FIN command
 	chFinEvent   chan struct{}
-	finEventOnce sync.Once // Ensures chFinEvent is closed only once
+	finEventOnce sync.Once

 	// deadlines
 	readDeadline  atomic.Value
 	writeDeadline atomic.Value

 	// per stream sliding window control
-	numRead    uint32 // count num of bytes read
+	numRead    uint32 // number of consumed bytes
 	numWritten uint32 // count num of bytes written
-	incr       uint32 // bytes sent since last window update
+	incr       uint32 // counting for sending

 	// UPD command
 	peerConsumed uint32        // num of bytes the peer has consumed
@ -75,9 +48,9 @@ type stream struct {
 	chUpdate     chan struct{} // notify of remote data consuming and window update
 }

-// newStream initializes and returns a new Stream.
-func newStream(id uint32, frameSize int, sess *Session) *stream {
-	s := new(stream)
+// newStream initiates a Stream struct
+func newStream(id uint32, frameSize int, sess *Session) *Stream {
+	s := new(Stream)
 	s.id = id
 	s.chReadEvent = make(chan struct{}, 1)
 	s.chUpdate = make(chan struct{}, 1)
@ -86,17 +59,16 @@ 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 stream's unique identifier.
-func (s *stream) ID() uint32 {
+// ID returns the unique stream ID.
+func (s *Stream) ID() uint32 {
 	return s.id
 }

-// Read reads data from the stream into the provided buffer.
-func (s *stream) Read(b []byte) (n int, err error) {
+// Read implements net.Conn
+func (s *Stream) Read(b []byte) (n int, err error) {
 	for {
 		n, err = s.tryRead(b)
 		if err == ErrWouldBlock {
@ -109,8 +81,8 @@ func (s *stream) Read(b []byte) (n int, err error) {
 	}
 }

-// tryRead attempts to read data from the stream without blocking.
-func (s *stream) tryRead(b []byte) (n int, err error) {
+// tryRead is the nonblocking version of Read
+func (s *Stream) tryRead(b []byte) (n int, err error) {
 	if s.sess.config.Version == 2 {
 		return s.tryReadv2(b)
 	}
@ -119,7 +91,6 @@ 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])
@ -147,8 +118,7 @@ func (s *stream) tryRead(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) {
+func (s *Stream) tryReadv2(b []byte) (n int, err error) {
 	if len(b) == 0 {
 		return 0, nil
 	}
@ -170,24 +140,19 @@ 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, continous flowing data
-	// won't slow down due to waiting for ACK, as long as the
-	// consumer keeps on reading data.
-	//
-	// s.numRead == n implies that it's the initial reading
+	// won't slow down because of waiting for ACK, as long as the
+	// consumer keeps on reading data
+	// s.numRead == n also notify window at the first read
 	s.numRead += uint32(n)
 	s.incr += uint32(n)
-
-	// for initial reading, send window update
 	if s.incr >= uint32(s.sess.config.MaxStreamBuffer/2) || s.numRead == uint32(n) {
 		notifyConsumed = s.numRead
-		s.incr = 0 // reset couting for next window update
+		s.incr = 0
 	}
 	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
@ -205,12 +170,7 @@ func (s *stream) tryReadv2(b []byte) (n int, err error) {
 }

 // WriteTo implements io.WriteTo
-// WriteTo writes data to w until there's no more data to write or when an error occurs.
-// The return value n is the number of bytes written. Any error encountered during the write is also returned.
-// WriteTo calls Write in a loop until there is no more data to write or when an error occurs.
-// If the underlying stream is a v2 stream, it will send window update to peer when necessary.
-// If the underlying stream is a v1 stream, it will not send window update to peer.
-func (s *stream) WriteTo(w io.Writer) (n int64, err error) {
+func (s *Stream) WriteTo(w io.Writer) (n int64, err error) {
 	if s.sess.config.Version == 2 {
 		return s.writeTov2(w)
 	}
@ -227,7 +187,6 @@ 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 {
@ -243,8 +202,7 @@ func (s *stream) WriteTo(w io.Writer) (n int64, err error) {
 	}
 }

-// check comments in WriteTo
-func (s *stream) writeTov2(w io.Writer) (n int64, err error) {
+func (s *Stream) writeTov2(w io.Writer) (n int64, err error) {
 	for {
 		var notifyConsumed uint32
 		var buf []byte
@ -264,7 +222,6 @@ 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 {
@ -286,8 +243,7 @@ func (s *stream) writeTov2(w io.Writer) (n int64, err error) {
 	}
 }

-// sendWindowUpdate sends a window update frame to the peer.
-func (s *stream) sendWindowUpdate(consumed uint32) error {
+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() {
@ -301,12 +257,11 @@ 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, CLSCTRL)
+	_, err := s.sess.writeFrameInternal(frame, deadline, CLSDATA)
 	return err
 }

-// waitRead blocks until a read event occurs or a deadline is reached.
-func (s *stream) waitRead() error {
+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() {
@ -316,10 +271,10 @@ func (s *stream) waitRead() error {
 	}

 	select {
-	case <-s.chReadEvent: // notify some data has arrived, or closed
+	case <-s.chReadEvent:
 		return nil
 	case <-s.chFinEvent:
-		// BUGFIX(xtaci): Fix for https://github.com/xtaci/smux/issues/82
+		// BUG(xtaci): Fix for https://github.com/xtaci/smux/issues/82
 		s.bufferLock.Lock()
 		defer s.bufferLock.Unlock()
 		if len(s.buffers) > 0 {
@ -342,7 +297,7 @@ 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)
 	}
@ -356,8 +311,6 @@ 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:
@ -385,8 +338,7 @@ func (s *stream) Write(b []byte) (n int, err error) {
 	return sent, nil
 }

-// writeV2 writes data to the stream for version 2 streams.
-func (s *stream) writeV2(b []byte) (n int, err error) {
+func (s *Stream) writeV2(b []byte) (n int, err error) {
 	// check empty input
 	if len(b) == 0 {
 		return 0, nil
@ -394,8 +346,6 @@ 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:
@ -422,18 +372,14 @@ 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
-		//
-		// basicially, you can take it as a MODULAR ARITHMETIC
+		// security check for misbehavior
 		inflight := int32(atomic.LoadUint32(&s.numWritten) - atomic.LoadUint32(&s.peerConsumed))
-		if inflight < 0 { // security check for malformed data
+		if inflight < 0 {
 			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
@ -442,17 +388,13 @@ 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:]
-
-				// transmit of frame
 				n, err := s.sess.writeFrameInternal(frame, deadline, CLSDATA)
 				atomic.AddUint32(&s.numWritten, uint32(sz))
 				sent += n
@ -462,12 +404,12 @@ func (s *stream) writeV2(b []byte) (n int, err error) {
 			}
 		}

-		// if there is any data left to be sent,
+		// if there is any data remaining to be sent
 		// wait until stream closes, window changes or deadline reached
-		// this blocking behavior will back propagate flow control to upper layer.
+		// this blocking behavior will inform upper layer to do flow control
 		if len(b) > 0 {
 			select {
-			case <-s.chFinEvent:
+			case <-s.chFinEvent: // if fin arrived, future window update is impossible
 				return 0, io.EOF
 			case <-s.die:
 				return sent, io.ErrClosedPipe
@ -475,7 +417,7 @@ 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: // notify of remote data consuming and window update
+			case <-s.chUpdate:
 				continue
 			}
 		} else {
@ -485,7 +427,7 @@ 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() {
@ -494,13 +436,7 @@ func (s *stream) Close() error {
 	})

 	if once {
-		// send FIN in order
-		f := newFrame(byte(s.sess.config.Version), cmdFIN, s.id)
-
-		timer := time.NewTimer(openCloseTimeout)
-		defer timer.Stop()
-
-		_, err = s.sess.writeFrameInternal(f, timer.C, CLSDATA)
+		_, err = s.sess.writeFrame(newFrame(byte(s.sess.config.Version), cmdFIN, s.id))
 		s.sess.streamClosed(s.id)
 		return err
 	} else {
@ -510,14 +446,14 @@ func (s *stream) Close() error {

 // 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
@ -526,7 +462,7 @@ 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
 }
@ -534,7 +470,7 @@ 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
 	}
@ -545,10 +481,10 @@ 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 {
@ -558,7 +494,7 @@ 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 {
@ -568,7 +504,7 @@ 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)
@ -577,7 +513,7 @@ 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])
@ -590,7 +526,7 @@ func (s *stream) recycleTokens() (n int) {
 }

 // notify read event
-func (s *stream) notifyReadEvent() {
+func (s *Stream) notifyReadEvent() {
 	select {
 	case s.chReadEvent <- struct{}{}:
 	default:
@ -598,7 +534,7 @@ 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 {
@ -608,7 +544,7 @@ 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)
 	})
--- a/proxy/direct.go
+++ b/proxy/direct.go
@ -139,10 +139,7 @@ func init() {
 Direct scheme:
  direct://

-Only needed when you want to specify the outgoing interface:
-  glider -verbose -listen :8443 -forward direct://#interface=eth0
-
-Or load balance multiple interfaces directly:
+Only needed when you want to 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:
--- a/proxy/http/client.go
+++ b/proxy/http/client.go
@ -33,8 +33,6 @@ 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")
@ -47,6 +45,7 @@ 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
 	}
--- a/proxy/obfs/tls.go
+++ b/proxy/obfs/tls.go
@ -64,7 +64,10 @@ func (c *TLSObfsConn) Write(b []byte) (int, error) {
 	n := len(b)
 	for i := 0; i < n; i += chunkSize {
 		buf.Reset()
-		end := min(i+chunkSize, n)
+		end := i + chunkSize
+		if end > n {
+			end = n
+		}

 		buf.Write([]byte{0x17, 0x03, 0x03})
 		binary.Write(buf, binary.BigEndian, uint16(len(b[i:end])))
--- a/proxy/redir/redir_linux.go
+++ b/proxy/redir/redir_linux.go
@ -60,7 +60,7 @@ func (s *RedirProxy) ListenAndServe() {
 		return
 	}

-	log.F("[redir] listening TCP on %s", s.addr)
+	log.F("[redir] listening TCP on " + s.addr)

 	for {
 		c, err := l.Accept()
--- a/proxy/ss/server.go
+++ b/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] %s <-> target error: %v", c.RemoteAddr(), err)
+		log.F("[ss] failed to get target address: %v", err)
 		proxy.Copy(io.Discard, c) // https://github.com/nadoo/glider/issues/180
 		return
 	}
--- a/proxy/ssr/internal/cipher/cipher.go
+++ b/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"
--- a/proxy/ssr/internal/client.go
+++ b/proxy/ssr/internal/client.go
@ -8,7 +8,9 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
+	"math/rand"
 	"net"
+	"time"

 	"github.com/nadoo/glider/pkg/pool"
 	"github.com/nadoo/glider/proxy"
@ -19,6 +21,10 @@ 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
--- a/proxy/ssr/internal/obfs/http_post.go
+++ b/proxy/ssr/internal/obfs/http_post.go
@ -1,7 +1,7 @@
 package obfs

 import (
-	"math/rand/v2"
+	"math/rand"
 )

 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
--- a/proxy/ssr/internal/obfs/http_simple.go
+++ b/proxy/ssr/internal/obfs/http_simple.go
@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/hex"
 	"fmt"
-	"math/rand/v2"
+	"math/rand"
 	"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 range 32 {
-		ret = fmt.Sprintf("%s%c", ret, set[rand.IntN(len(set))])
+	for i := 0; i < 32; i++ {
+		ret = fmt.Sprintf("%s%c", ret, set[rand.Intn(len(set))])
 	}
 	return
 }

 func (t *httpSimplePost) data2URLEncode(data []byte) (ret string) {
-	for i := range data {
+	for i := 0; i < len(data); i++ {
 		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 /"
--- a/proxy/ssr/internal/obfs/random_head.go
+++ b/proxy/ssr/internal/obfs/random_head.go
@ -1,8 +1,7 @@
 package obfs

 import (
-	crand "crypto/rand"
-	"math/rand/v2"
+	"math/rand"

 	"github.com/nadoo/glider/proxy/ssr/internal/ssr"
 )
@ -58,9 +57,9 @@ 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)
-		crand.Read(encodedData)
+		rand.Read(encodedData)
 		ssr.SetCRC32(encodedData, size)

 		d := make([]byte, dataLength)
--- a/proxy/ssr/internal/obfs/tls12_ticket_auth.go
+++ b/proxy/ssr/internal/obfs/tls12_ticket_auth.go
@ -3,11 +3,10 @@ package obfs
 import (
 	"bytes"
 	"crypto/hmac"
-	crand "crypto/rand"
 	"encoding/binary"
 	"fmt"
 	"log"
-	"math/rand/v2"
+	"math/rand"
 	"strings"
 	"time"

@ -65,7 +64,7 @@ func (t *tls12TicketAuth) GetData() any {
 		t.data = &tlsAuthData{}
 		b := make([]byte, 32)

-		crand.Read(b)
+		rand.Read(b)
 		copy(t.data.localClientID[:], b)
 	}
 	return t.data
@ -77,7 +76,7 @@ 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)
 		}
 	}
@ -97,6 +96,7 @@ 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)
-		crand.Read(hmacData[11:33])
+		rand.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
-		crand.Read(tlsData[tlsDataLen : tlsDataLen+ticketLen])
+		rand.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))

-	crand.Read(outData[4 : 4+18])
+	rand.Read(outData[4 : 4+18])

 	hash := t.hmacSHA1(outData[:outSize-ssr.ObfsHMACSHA1Len])
 	copy(outData[outSize-ssr.ObfsHMACSHA1Len:], hash)
--- a/proxy/ssr/internal/protocol/auth_aes128_md5.go
+++ b/proxy/ssr/internal/protocol/auth_aes128_md5.go
@ -4,10 +4,9 @@ import (
 	"bytes"
 	"crypto/aes"
 	"crypto/cipher"
-	crand "crypto/rand"
 	"encoding/base64"
 	"encoding/binary"
-	"math/rand/v2"
+	"math/rand"
 	"strconv"
 	"strings"
 	"time"
@ -75,14 +74,15 @@ 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
-	crand.Read(outData[4 : 4+randLength])
+	rand.Read(outData[4 : 4+randLength])
 	// 4, rand length
 	if randLength < 128 {
 		outData[4] = byte(randLength & 0xFF)
@ -121,10 +121,11 @@ 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
@ -135,7 +136,7 @@ func (a *authAES128) packAuthData(data []byte) (outData []byte) {
 	copy(key, a.IV)
 	copy(key[a.IVLen:], a.Key)

-	crand.Read(outData[dataOffset-randLength:])
+	rand.Read(outData[dataOffset-randLength:])
 	a.data.mutex.Lock()
 	a.data.connectionID++
 	if a.data.connectionID > 0xFF000000 {
@ -143,9 +144,9 @@ func (a *authAES128) packAuthData(data []byte) (outData []byte) {
 	}
 	if len(a.data.clientID) == 0 {
 		a.data.clientID = make([]byte, 8)
-		crand.Read(a.data.clientID)
+		rand.Read(a.data.clientID)
 		b := make([]byte, 4)
-		crand.Read(b)
+		rand.Read(b)
 		a.data.connectionID = binary.LittleEndian.Uint32(b) & 0xFFFFFF
 	}
 	copy(encrypt[4:], a.data.clientID)
@ -162,13 +163,13 @@ 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 {
-			crand.Read(uid)
+			rand.Read(uid)
 		} else {
 			binary.LittleEndian.PutUint32(uid, uint32(userID))
 			a.userKey = a.hashDigest([]byte(params[1]))
 		}
 	} else {
-		crand.Read(uid)
+		rand.Read(uid)
 	}

 	if a.userKey == nil {
@ -195,7 +196,7 @@ func (a *authAES128) packAuthData(data []byte) (outData []byte) {
 	h := a.hmac(key, encrypt[0:20])
 	copy(encrypt[20:], h[:4])

-	crand.Read(outData[0:1])
+	rand.Read(outData[0:1])
 	h = a.hmac(key, outData[0:1])
 	copy(outData[1:], h[0:7-1])

--- a/proxy/ssr/internal/protocol/auth_chain_a.go
+++ b/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 := range 4 {
+		for i := 0; i < 4; i++ {
 			uid[i] = a.uid[i] ^ a.lastClientHash[8+i]
 		}
 		base64UserKey = base64.StdEncoding.EncodeToString(a.userKey)
--- a/proxy/ssr/internal/protocol/auth_chain_b.go
+++ b/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 := range int(length) {
+	for i := 0; i < int(length); i++ {
 		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 := range int(length) {
+	for i := 0; i < int(length); i++ {
 		a.dataSizeList2[i] = int(random.Next() % 2340 % 2040 % 1440)
 	}
 	sort.Ints(a.dataSizeList2)
--- a/proxy/ssr/internal/protocol/auth_sha1_v4.go
+++ b/proxy/ssr/internal/protocol/auth_sha1_v4.go
@ -2,9 +2,8 @@ package protocol

 import (
 	"bytes"
-	crand "crypto/rand"
 	"encoding/binary"
-	"math/rand/v2"
+	"math/rand"
 	"time"

 	"github.com/nadoo/glider/proxy/ssr/internal/ssr"
@ -54,9 +53,9 @@ 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)
 		}
 	}

@ -91,9 +90,9 @@ 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
@ -105,9 +104,9 @@ func (a *authSHA1v4) packAuthData(data []byte) (outData []byte) {
 	}
 	if len(a.data.clientID) == 0 {
 		a.data.clientID = make([]byte, 8)
-		crand.Read(a.data.clientID)
+		rand.Read(a.data.clientID)
 		b := make([]byte, 4)
-		crand.Read(b)
+		rand.Read(b)
 		a.data.connectionID = binary.LittleEndian.Uint32(b) & 0xFFFFFF
 	}
 	// 0-1, out length
@ -123,7 +122,7 @@ 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
-	crand.Read(outData[dataOffset-randLength : dataOffset])
+	rand.Read(outData[dataOffset-randLength : dataOffset])
 	// 6, rand length
 	if randLength < 128 {
 		outData[6] = byte(randLength & 0xFF)
--- a/proxy/ssr/internal/ssr/crc32.go
+++ b/proxy/ssr/internal/ssr/crc32.go
@ -11,7 +11,7 @@ func init() {
 }

 func createCRC32Table() {
-	for i := range 256 {
+	for i := 0; i < 256; i++ {
 		crc := uint32(i)
 		for j := 8; j > 0; j-- {
 			if crc&1 == 1 {
--- a/proxy/ssr/internal/tools/obfsutil.go
+++ b/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 range 4 {
+	for i := 0; i < 4; i++ {
 		ctx.Next()
 	}
 }
--- a/proxy/tproxy/server.go
+++ b/proxy/tproxy/server.go
@ -1,5 +1,3 @@
-//go:build linux
-
 package tproxy

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

 import (
--- a/proxy/vmess/client.go
+++ b/proxy/vmess/client.go
@ -5,14 +5,13 @@ import (
 	"crypto/cipher"
 	"crypto/hmac"
 	"crypto/md5"
-	crand "crypto/rand"
 	"crypto/sha256"
 	"encoding/binary"
 	"errors"
 	"fmt"
 	"hash/fnv"
 	"io"
-	"math/rand/v2"
+	"math/rand"
 	"net"
 	"runtime"
 	"strings"
@ -117,12 +116,15 @@ 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
@ -132,12 +134,12 @@ func (c *Client) NewConn(rc net.Conn, target string, cmd CmdType) (*Conn, error)
 	}

 	randBytes := pool.GetBuffer(32)
-	crand.Read(randBytes)
+	rand.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[:])
@ -193,7 +195,7 @@ 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)

@ -208,7 +210,7 @@ func (c *Conn) Request(cmd CmdType) error {
 	// padding
 	if paddingLen > 0 {
 		padding := pool.GetBuffer(paddingLen)
-		crand.Read(padding)
+		rand.Read(padding)
 		buf.Write(padding)
 		pool.PutBuffer(padding)
 	}
--- a/proxy/vmess/user.go
+++ b/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 := range alterID {
+	for i := 0; i < alterID; i++ {
 		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}
--- a/proxy/vsock/client.go
+++ b/proxy/vsock/client.go
@ -1,5 +1,3 @@
-//go:build linux
-
 package vsock

 import (
--- a/proxy/vsock/server.go
+++ b/proxy/vsock/server.go
@ -1,5 +1,3 @@
-//go:build linux
-
 package vsock

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

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

 import (
--- a/proxy/ws/frame.go
+++ b/proxy/ws/frame.go
@ -25,7 +25,7 @@ package ws
 import (
 	"encoding/binary"
 	"io"
-	"math/rand/v2"
+	"math/rand"
 	"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 := range nPayload {
+	for i := 0; i < nPayload; i++ {
 		payload[i] = b[i] ^ w.maskKey[i%4]
 	}

--- a/rule/group.go
+++ b/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 := range p.fwdrs {
+	for i := 0; i < len(p.fwdrs); i++ {
 		go p.check(p.fwdrs[i], checker)
 	}
 }
--- a/service/dhcpd/cilent.go
+++ b/service/dhcpd/cilent.go
@ -1,5 +1,3 @@
-//go:build linux
-
 package dhcpd

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

 import (
@ -128,69 +126,58 @@ func (d *dhcpd) handleDHCP(serverIP net.IP, mask net.IPMask, pool *Pool) server4
 			return
 		}

-		var reqIP netip.Addr
 		var reqType, replyType dhcpv4.MessageType
-
-		reqType = m.MessageType()
-		log.F("[dpcpd] %s: %s from %v(%v)", d.name, reqType, m.ClientHWAddr, m.ClientIPAddr)
-
-		switch reqType {
+		switch reqType = m.MessageType(); reqType {
 		case dhcpv4.MessageTypeDiscover:
 			replyType = dhcpv4.MessageTypeOffer
-		case dhcpv4.MessageTypeInform:
+		case dhcpv4.MessageTypeRequest, dhcpv4.MessageTypeInform:
 			replyType = dhcpv4.MessageTypeAck
-		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:
+		case dhcpv4.MessageTypeRelease:
 			pool.ReleaseIP(m.ClientHWAddr)
+			log.F("[dpcpd] %s: %v requests to release 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 from %v", d.name, reqType, m.ClientHWAddr)
+			log.F("[dpcpd] %s: can't handle type %v", d.name, reqType)
 			return
 		}

-		replyIP, err := pool.LeaseIP(m.ClientHWAddr, reqIP)
+		replyIP, err := pool.LeaseIP(m.ClientHWAddr)
 		if err != nil {
-			log.F("[dpcpd] %s: can not assign IP for %v, error: %s", d.name, m.ClientHWAddr, err)
+			log.F("[dpcpd] %s: can not assign IP for %v, error %s", d.name, m.ClientHWAddr, err)
 			return
 		}

-		if reqType == dhcpv4.MessageTypeRequest && !reqIP.IsUnspecified() && reqIP != replyIP {
-			replyType = dhcpv4.MessageTypeNak
-		}
-
-		resp, err := dhcpv4.NewReplyFromRequest(m,
+		reply, err := dhcpv4.NewReplyFromRequest(m,
 			dhcpv4.WithMessageType(replyType),
+			dhcpv4.WithServerIP(serverIP),
 			dhcpv4.WithNetmask(mask),
 			dhcpv4.WithYourIP(replyIP.AsSlice()),
 			dhcpv4.WithRouter(serverIP),
 			dhcpv4.WithDNS(serverIP),
-			dhcpv4.WithServerIP(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)),
+			// RFC 2131, Section 4.3.1. IP lease time: MUST
+			dhcpv4.WithOption(dhcpv4.OptIPAddressLeaseTime(d.lease)),
 		)
 		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 err := reply(d.iface, resp); err != nil {
-			log.F("[dpcpd] %s: could not write to %v(%v): %s",
-				d.name, resp.ClientHWAddr, peer, err)
+		if val := m.Options.Get(dhcpv4.OptionClientIdentifier); len(val) > 0 {
+			reply.UpdateOption(dhcpv4.OptGeneric(dhcpv4.OptionClientIdentifier, val))
+		}
+
+		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: %s to %v for %v",
-			d.name, replyType, resp.ClientHWAddr, replyIP)
-
+		log.F("[dpcpd] %s: lease %v to client %v", d.name, replyIP, reply.ClientHWAddr)
 	}
 }

--- a/service/dhcpd/pool.go
+++ b/service/dhcpd/pool.go
@ -1,11 +1,9 @@
-//go:build linux
-
 package dhcpd

 import (
 	"bytes"
 	"errors"
-	"math/rand/v2"
+	"math/rand"
 	"net"
 	"net/netip"
 	"sync"
@ -40,12 +38,13 @@ 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 := range len(items) {
+			for i := 0; i < len(items); i++ {
 				if !items[i].expire.IsZero() && now.After(items[i].expire) {
 					items[i].mac = nil
 					items[i].expire = time.Time{}
@ -59,31 +58,17 @@ 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, ip netip.Addr) (netip.Addr, error) {
+func (p *Pool) LeaseIP(mac net.HardwareAddr) (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
 		}
 	}

-	// 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))
+	idx := rand.Intn(len(p.items))
 	for _, item := range p.items[idx:] {
 		if item.mac == nil {
 			item.mac = mac
--- a/service/dhcpd/reply.go
+++ b/service/dhcpd/reply.go
@ -1,86 +0,0 @@
-//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)
-}