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52 lines
886 B
Go
52 lines
886 B
Go
package socks
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import (
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"io"
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"log"
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"net"
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"time"
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)
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const (
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socks4Version = 0x04
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socks5Version = 0x05
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cmdConnect = 0x01
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addrTypeIPv4 = 0x01
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addrTypeDomain = 0x03
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addrTypeIPv6 = 0x04
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)
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type dialFunc func(network, addr string) (net.Conn, error)
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// SocksConn present a client connection
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type SocksConn struct {
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ClientConn net.Conn
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Dial dialFunc
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}
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// Serve serve the client
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func (s *SocksConn) Serve() {
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buf := make([]byte, 1)
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// read version
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io.ReadFull(s.ClientConn, buf)
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dial := s.Dial
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if s.Dial == nil {
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d := net.Dialer{Timeout: 10 * time.Second}
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dial = d.Dial
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}
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switch buf[0] {
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case socks4Version:
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s4 := socks4Conn{client_conn: s.ClientConn, dial: dial}
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s4.Serve()
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case socks5Version:
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s5 := socks5Conn{client_conn: s.ClientConn, dial: dial}
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s5.Serve()
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default:
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log.Printf("error version %s", buf[0])
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s.ClientConn.Close()
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}
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}
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