111 lines
2.4 KiB
Go
111 lines
2.4 KiB
Go
package socks
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import (
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"io"
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"net"
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"github.com/Dreamacro/clash/adapter/inbound"
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N "github.com/Dreamacro/clash/common/net"
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C "github.com/Dreamacro/clash/constant"
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authStore "github.com/Dreamacro/clash/listener/auth"
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"github.com/Dreamacro/clash/transport/socks4"
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"github.com/Dreamacro/clash/transport/socks5"
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)
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type Listener struct {
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listener net.Listener
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addr string
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closed bool
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specialRules string
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name string
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}
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// RawAddress implements C.Listener
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func (l *Listener) RawAddress() string {
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return l.addr
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}
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// Address implements C.Listener
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func (l *Listener) Address() string {
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return l.listener.Addr().String()
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}
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// Close implements C.Listener
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func (l *Listener) Close() error {
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l.closed = true
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return l.listener.Close()
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}
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func New(addr string, in chan<- C.ConnContext) (*Listener, error) {
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return NewWithInfos(addr, "DEFAULT-SOCKS", "", in)
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}
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func NewWithInfos(addr, name, specialRules string, in chan<- C.ConnContext) (*Listener, error) {
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l, err := inbound.Listen("tcp", addr)
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if err != nil {
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return nil, err
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}
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sl := &Listener{
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listener: l,
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addr: addr,
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name: name,
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specialRules: specialRules,
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}
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go func() {
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for {
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c, err := l.Accept()
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if err != nil {
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if sl.closed {
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break
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}
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continue
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}
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go handleSocks(sl.name, sl.specialRules, c, in)
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}
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}()
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return sl, nil
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}
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func handleSocks(name, specialRules string, conn net.Conn, in chan<- C.ConnContext) {
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conn.(*net.TCPConn).SetKeepAlive(true)
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bufConn := N.NewBufferedConn(conn)
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head, err := bufConn.Peek(1)
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if err != nil {
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conn.Close()
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return
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}
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switch head[0] {
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case socks4.Version:
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HandleSocks4(name, specialRules, bufConn, in)
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case socks5.Version:
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HandleSocks5(name, specialRules, bufConn, in)
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default:
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conn.Close()
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}
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}
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func HandleSocks4(name, specialRules string, conn net.Conn, in chan<- C.ConnContext) {
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addr, _, err := socks4.ServerHandshake(conn, authStore.Authenticator())
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if err != nil {
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conn.Close()
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return
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}
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in <- inbound.NewSocketWithInfos(socks5.ParseAddr(addr), conn, C.SOCKS4, name, specialRules)
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}
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func HandleSocks5(name, specialRules string, conn net.Conn, in chan<- C.ConnContext) {
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target, command, err := socks5.ServerHandshake(conn, authStore.Authenticator())
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if err != nil {
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conn.Close()
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return
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}
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if command == socks5.CmdUDPAssociate {
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defer conn.Close()
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io.Copy(io.Discard, conn)
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return
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}
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in <- inbound.NewSocketWithInfos(target, conn, C.SOCKS5, name, specialRules)
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}
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