Connect via a SOCKS server in golang
The function below allows you to setup a SOCKS connection in golang. You should already have connected to the SOCKS server using net.Dial. The function will then send the required header to connect to the target address/port provides in address:port format. For example:
conn, err = net.Dial("tcp", "socksproxy:8080")
err = socks_connect(conn, "hosttoconnectto:80")
You can then communicate with the target server via the SOCKS proxy.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | func socks_connect(conn net.Conn, address string) (error) { host, portstr, err := net.SplitHostPort(address) port, err2 := strconv.Atoi(portstr) if err2 != nil { return errors.New("Unable to parse port") } version := []byte{0x04} // socks version 4 cmd := []byte{0x01} // socks stream mode buffer := bytes.NewBuffer([]byte{}) binary.Write(buffer, binary.BigEndian, version) binary.Write(buffer, binary.BigEndian, cmd) binary.Write(buffer, binary.BigEndian, uint16(port)) binary.Write(buffer, binary.BigEndian, []byte{0x00, 0x00, 0x00, 0x01}) binary.Write(buffer, binary.BigEndian, []byte{0x00}) binary.Write(buffer, binary.BigEndian, []byte(host)) binary.Write(buffer, binary.BigEndian, []byte{0x00}) binary.Write(conn, binary.BigEndian, buffer.Bytes()) data := make([]byte, 8) // socks responses are 8 bytes count, err := conn.Read(data) if err != nil { return errors.New("Unable to connect to socks server.") } if count == 0 { return errors.New("Unable to connect to socks server.") } if data[1] == 0x5a { // success return nil } return errors.New("Unable to connect to socks server.")} |
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