109 lines
2.3 KiB
Go
109 lines
2.3 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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}
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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, tunnel C.Tunnel, additions ...inbound.Addition) (*Listener, error) {
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if len(additions) == 0 {
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additions = []inbound.Addition{
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inbound.WithInName("DEFAULT-SOCKS"),
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inbound.WithSpecialRules(""),
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}
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}
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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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}
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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(c, tunnel, additions...)
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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(conn net.Conn, tunnel C.Tunnel, additions ...inbound.Addition) {
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N.TCPKeepAlive(conn)
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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(bufConn, tunnel, additions...)
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case socks5.Version:
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HandleSocks5(bufConn, tunnel, additions...)
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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(conn net.Conn, tunnel C.Tunnel, additions ...inbound.Addition) {
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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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tunnel.HandleTCPConn(inbound.NewSocket(socks5.ParseAddr(addr), conn, C.SOCKS4, additions...))
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}
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func HandleSocks5(conn net.Conn, tunnel C.Tunnel, additions ...inbound.Addition) {
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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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tunnel.HandleTCPConn(inbound.NewSocket(target, conn, C.SOCKS5, additions...))
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}
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