271 lines
8.4 KiB
Go
271 lines
8.4 KiB
Go
package main
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"github.com/ginuerzh/gosocks5"
|
|
"github.com/golang/glog"
|
|
"net"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
func handleTcpForward(conn net.Conn, arg Args) {
|
|
defer conn.Close()
|
|
|
|
if !strings.Contains(arg.Remote, ":") {
|
|
arg.Remote += ":22" // default is ssh service
|
|
}
|
|
glog.V(LINFO).Infof("[tcp-forward] %s - %s", conn.RemoteAddr(), arg.Remote)
|
|
c, err := Connect(arg.Remote)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[tcp-forward] %s -> %s : %s", conn.RemoteAddr(), arg.Remote, err)
|
|
return
|
|
}
|
|
defer c.Close()
|
|
|
|
glog.V(LINFO).Infof("[tcp-forward] %s <-> %s", conn.RemoteAddr(), arg.Remote)
|
|
Transport(conn, c)
|
|
glog.V(LINFO).Infof("[tcp-forward] %s >-< %s", conn.RemoteAddr(), arg.Remote)
|
|
}
|
|
|
|
func handleUdpForward(conn *net.UDPConn, raddr *net.UDPAddr, data []byte, arg Args) {
|
|
if !strings.Contains(arg.Remote, ":") {
|
|
arg.Remote += ":53" // default is dns service
|
|
}
|
|
|
|
faddr, err := net.ResolveUDPAddr("udp", arg.Remote)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s -> %s : %s", raddr, arg.Remote, err)
|
|
return
|
|
}
|
|
|
|
glog.V(LINFO).Infof("[udp-forward] %s - %s", raddr, faddr)
|
|
|
|
if len(forwardArgs) == 0 {
|
|
lconn, err := net.ListenUDP("udp", nil)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s -> %s : %s", raddr, arg.Remote, err)
|
|
return
|
|
}
|
|
defer lconn.Close()
|
|
|
|
if _, err := lconn.WriteToUDP(data, faddr); err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s -> %s : %s", raddr, arg.Remote, err)
|
|
return
|
|
}
|
|
glog.V(LDEBUG).Infof("[udp-forward] %s >>> %s length %d", raddr, arg.Remote, len(data))
|
|
|
|
b := udpPool.Get().([]byte)
|
|
defer udpPool.Put(b)
|
|
lconn.SetReadDeadline(time.Now().Add(time.Second * 60))
|
|
n, addr, err := lconn.ReadFromUDP(b)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s <- %s : %s", raddr, arg.Remote, err)
|
|
return
|
|
}
|
|
glog.V(LDEBUG).Infof("[udp-forward] %s <<< %s length %d", raddr, addr, n)
|
|
|
|
if _, err := conn.WriteToUDP(b[:n], raddr); err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s <- %s : %s", raddr, arg.Remote, err)
|
|
}
|
|
glog.V(LINFO).Infof("[udp-forward] %s >-< %s", raddr, arg.Remote)
|
|
return
|
|
}
|
|
|
|
tun, _, err := forwardChain(forwardArgs...)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s -> %s : %s", raddr, arg.Remote, err)
|
|
return
|
|
}
|
|
defer tun.Close()
|
|
|
|
glog.V(LINFO).Infof("[udp-forward] %s -> %s ASSOCIATE", raddr, arg.Remote)
|
|
|
|
req := gosocks5.NewRequest(CmdUdpTun, nil)
|
|
tun.SetWriteDeadline(time.Now().Add(time.Second * 90))
|
|
if err = req.Write(tun); err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s -> %s ASSOCIATE : %s", raddr, arg.Remote, err)
|
|
return
|
|
}
|
|
tun.SetWriteDeadline(time.Time{})
|
|
glog.V(LDEBUG).Infof("[udp-forward] %s -> %s\n%s", raddr, arg.Remote, req)
|
|
|
|
tun.SetReadDeadline(time.Now().Add(90 * time.Second))
|
|
rep, err := gosocks5.ReadReply(tun)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s <- %s ASSOCIATE : %s", raddr, arg.Remote, err)
|
|
return
|
|
}
|
|
tun.SetReadDeadline(time.Time{})
|
|
|
|
glog.V(LDEBUG).Infof("[udp-forward] %s <- %s\n%s", raddr, arg.Remote, rep)
|
|
if rep.Rep != gosocks5.Succeeded {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s <- %s ASSOCIATE failured", raddr, arg.Remote)
|
|
return
|
|
}
|
|
glog.V(LINFO).Infof("[udp-forward] %s <-> %s ASSOCIATE ON %s", raddr, arg.Remote, rep.Addr)
|
|
|
|
dgram := gosocks5.NewUDPDatagram(
|
|
gosocks5.NewUDPHeader(uint16(len(data)), 0, ToSocksAddr(faddr)), data)
|
|
|
|
tun.SetWriteDeadline(time.Now().Add(time.Second * 90))
|
|
if err = dgram.Write(tun); err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s -> %s : %s", raddr, arg.Remote, err)
|
|
return
|
|
}
|
|
tun.SetWriteDeadline(time.Time{})
|
|
glog.V(LDEBUG).Infof("[udp-forward] %s >>> %s length %d", raddr, arg.Remote, len(data))
|
|
|
|
tun.SetReadDeadline(time.Now().Add(time.Second * 90))
|
|
dgram, err = gosocks5.ReadUDPDatagram(tun)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s <- %s : %s", raddr, arg.Remote, err)
|
|
return
|
|
}
|
|
tun.SetReadDeadline(time.Time{})
|
|
glog.V(LDEBUG).Infof("[udp-forward] %s <<< %s length %d", raddr, dgram.Header.Addr, len(dgram.Data))
|
|
|
|
if _, err = conn.WriteToUDP(dgram.Data, raddr); err != nil {
|
|
glog.V(LWARNING).Infof("[udp-forward] %s <- %s : %s", raddr, arg.Remote, err)
|
|
}
|
|
|
|
// NOTE: for now we only get one response from peer
|
|
glog.V(LINFO).Infof("[udp-forward] %s >-< %s", raddr, arg.Remote)
|
|
}
|
|
|
|
func connectRTcpForward(conn net.Conn, arg Args) error {
|
|
glog.V(LINFO).Infof("[rtcp] %s - %s", arg.Addr, arg.Remote)
|
|
|
|
addr, _ := net.ResolveTCPAddr("tcp", arg.Addr)
|
|
req := gosocks5.NewRequest(gosocks5.CmdBind, ToSocksAddr(addr))
|
|
bindAddr := req.Addr
|
|
if err := req.Write(conn); err != nil {
|
|
glog.V(LWARNING).Infof("[rtcp] %s <- %s : %s", bindAddr, arg.Remote, err)
|
|
return err
|
|
}
|
|
|
|
// first reply, bind status
|
|
conn.SetReadDeadline(time.Now().Add(90 * time.Second))
|
|
rep, err := gosocks5.ReadReply(conn)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[rtcp] %s -> %s : %s", bindAddr, arg.Remote, err)
|
|
return err
|
|
}
|
|
conn.SetReadDeadline(time.Time{})
|
|
if rep.Rep != gosocks5.Succeeded {
|
|
glog.V(LWARNING).Infof("[rtcp] %s -> %s : bind on %s failure", bindAddr, arg.Remote, arg.Addr)
|
|
return errors.New("Bind on " + arg.Addr + " failure")
|
|
}
|
|
glog.V(LINFO).Infof("[rtcp] %s - %s BIND ON %s OK", bindAddr, arg.Remote, rep.Addr)
|
|
|
|
// second reply, peer connection
|
|
rep, err = gosocks5.ReadReply(conn)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[rtcp] %s -> %s : %s", bindAddr, arg.Remote, err)
|
|
return err
|
|
}
|
|
if rep.Rep != gosocks5.Succeeded {
|
|
glog.V(LWARNING).Infof("[rtcp] %s -> %s : peer connect failure", bindAddr, arg.Remote)
|
|
return errors.New("peer connect failure")
|
|
}
|
|
|
|
glog.V(LINFO).Infof("[rtcp] %s -> %s PEER %s CONNECTED", bindAddr, arg.Remote, rep.Addr)
|
|
|
|
go func() {
|
|
defer conn.Close()
|
|
|
|
lconn, err := net.Dial("tcp", arg.Remote)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[rtcp] %s -> %s : %s", rep.Addr, lconn.RemoteAddr(), err)
|
|
return
|
|
}
|
|
defer lconn.Close()
|
|
|
|
glog.V(LINFO).Infof("[rtcp] %s <-> %s", rep.Addr, lconn.RemoteAddr())
|
|
Transport(lconn, conn)
|
|
glog.V(LINFO).Infof("[rtcp] %s >-< %s", rep.Addr, lconn.RemoteAddr())
|
|
}()
|
|
|
|
return nil
|
|
}
|
|
|
|
func connectRUdpForward(conn net.Conn, arg Args) error {
|
|
glog.V(LINFO).Infof("[rudp] %s - %s", arg.Addr, arg.Remote)
|
|
|
|
addr, _ := net.ResolveUDPAddr("udp", arg.Addr)
|
|
req := gosocks5.NewRequest(CmdUdpTun, ToSocksAddr(addr))
|
|
bindAddr := req.Addr
|
|
conn.SetWriteDeadline(time.Now().Add(time.Second * 90))
|
|
if err := req.Write(conn); err != nil {
|
|
glog.V(LWARNING).Infof("[rudp] %s -> %s : %s", bindAddr, arg.Remote, err)
|
|
return err
|
|
}
|
|
conn.SetWriteDeadline(time.Time{})
|
|
|
|
conn.SetReadDeadline(time.Now().Add(90 * time.Second))
|
|
rep, err := gosocks5.ReadReply(conn)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[rudp] %s <- %s : %s", bindAddr, arg.Remote, err)
|
|
return err
|
|
}
|
|
conn.SetReadDeadline(time.Time{})
|
|
|
|
if rep.Rep != gosocks5.Succeeded {
|
|
glog.V(LWARNING).Infof("[rudp] %s <- %s : bind on %s failure", bindAddr, arg.Remote, arg.Addr)
|
|
return errors.New(fmt.Sprintf("Bind on %s failure", bindAddr))
|
|
}
|
|
|
|
glog.V(LINFO).Infof("[rudp] %s - %s BIND ON %s OK", bindAddr, arg.Remote, rep.Addr)
|
|
|
|
raddr, err := net.ResolveUDPAddr("udp", arg.Remote)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[rudp] %s <- %s : %s", bindAddr, arg.Remote, err)
|
|
return err
|
|
}
|
|
|
|
for {
|
|
dgram, err := gosocks5.ReadUDPDatagram(conn)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[rudp] %s <- %s : %s", bindAddr, arg.Remote, err)
|
|
return err
|
|
}
|
|
|
|
go func() {
|
|
b := udpPool.Get().([]byte)
|
|
defer udpPool.Put(b)
|
|
|
|
relay, err := net.DialUDP("udp", nil, raddr)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[rudp] %s -> %s : %s", bindAddr, arg.Remote, err)
|
|
return
|
|
}
|
|
defer relay.Close()
|
|
|
|
if _, err := relay.Write(dgram.Data); err != nil {
|
|
glog.V(LWARNING).Infof("[rudp] %s -> %s : %s", bindAddr, arg.Remote, err)
|
|
return
|
|
}
|
|
glog.V(LDEBUG).Infof("[rudp] %s <<< %s length: %d", arg.Remote, bindAddr, len(dgram.Data))
|
|
|
|
relay.SetReadDeadline(time.Now().Add(time.Second * 60))
|
|
n, err := relay.Read(b)
|
|
if err != nil {
|
|
glog.V(LWARNING).Infof("[rudp] %s <- %s : %s", bindAddr, arg.Remote, err)
|
|
return
|
|
}
|
|
relay.SetReadDeadline(time.Time{})
|
|
|
|
glog.V(LDEBUG).Infof("[rudp] %s >>> %s length: %d", arg.Remote, bindAddr, n)
|
|
|
|
conn.SetWriteDeadline(time.Now().Add(time.Second * 90))
|
|
if err := gosocks5.NewUDPDatagram(gosocks5.NewUDPHeader(uint16(n), 0, dgram.Header.Addr), b[:n]).Write(conn); err != nil {
|
|
glog.V(LWARNING).Infof("[rudp] %s <- %s : %s", bindAddr, arg.Remote, err)
|
|
return
|
|
}
|
|
conn.SetWriteDeadline(time.Time{})
|
|
}()
|
|
}
|
|
|
|
}
|