118 lines
2.2 KiB
Go
118 lines
2.2 KiB
Go
package socks
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import (
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"io"
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"net"
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"strconv"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/clash/tunnel"
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"github.com/riobard/go-shadowsocks2/socks"
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log "github.com/sirupsen/logrus"
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)
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var (
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tun = tunnel.GetInstance()
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)
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func NewSocksProxy(addr string) (*C.ProxySignal, error) {
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l, err := net.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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done := make(chan struct{})
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closed := make(chan struct{})
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signal := &C.ProxySignal{
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Done: done,
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Closed: closed,
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}
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go func() {
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log.Infof("SOCKS proxy listening at: %s", addr)
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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 _, open := <-done; !open {
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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)
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}
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}()
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go func() {
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<-done
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close(done)
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l.Close()
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closed <- struct{}{}
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}()
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return signal, nil
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}
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func handleSocks(conn net.Conn) {
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target, err := socks.Handshake(conn)
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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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conn.(*net.TCPConn).SetKeepAlive(true)
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tun.Add(NewSocks(target, conn))
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}
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type SocksAdapter struct {
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conn net.Conn
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addr *C.Addr
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}
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func (s *SocksAdapter) Close() {
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s.conn.Close()
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}
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func (s *SocksAdapter) Addr() *C.Addr {
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return s.addr
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}
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func (s *SocksAdapter) Connect(proxy C.ProxyAdapter) {
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go io.Copy(s.conn, proxy.ReadWriter())
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io.Copy(proxy.ReadWriter(), s.conn)
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}
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func parseSocksAddr(target socks.Addr) *C.Addr {
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var host, port string
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var ip net.IP
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switch target[0] {
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case socks.AtypDomainName:
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host = string(target[2 : 2+target[1]])
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port = strconv.Itoa((int(target[2+target[1]]) << 8) | int(target[2+target[1]+1]))
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ipAddr, err := net.ResolveIPAddr("ip", host)
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if err == nil {
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ip = ipAddr.IP
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}
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case socks.AtypIPv4:
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ip = net.IP(target[1 : 1+net.IPv4len])
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port = strconv.Itoa((int(target[1+net.IPv4len]) << 8) | int(target[1+net.IPv4len+1]))
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case socks.AtypIPv6:
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ip = net.IP(target[1 : 1+net.IPv6len])
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port = strconv.Itoa((int(target[1+net.IPv6len]) << 8) | int(target[1+net.IPv6len+1]))
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}
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return &C.Addr{
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NetWork: C.TCP,
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AddrType: int(target[0]),
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Host: host,
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IP: &ip,
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Port: port,
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}
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}
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func NewSocks(target socks.Addr, conn net.Conn) *SocksAdapter {
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return &SocksAdapter{
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conn: conn,
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addr: parseSocksAddr(target),
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}
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}
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