171 lines
3.4 KiB
Go
171 lines
3.4 KiB
Go
package v5
|
|
|
|
import (
|
|
"context"
|
|
"net"
|
|
"time"
|
|
|
|
"github.com/go-gost/gosocks5"
|
|
"github.com/go-gost/gost/pkg/chain"
|
|
"github.com/go-gost/gost/pkg/handler"
|
|
"github.com/go-gost/gost/pkg/internal/bufpool"
|
|
"github.com/go-gost/gost/pkg/internal/utils/socks"
|
|
)
|
|
|
|
func (h *socks5Handler) handleUDPTun(ctx context.Context, conn net.Conn, req *gosocks5.Request) {
|
|
h.logger = h.logger.WithFields(map[string]interface{}{
|
|
"cmd": "udp-tun",
|
|
})
|
|
|
|
if !h.md.enableUDP {
|
|
reply := gosocks5.NewReply(gosocks5.NotAllowed, nil)
|
|
reply.Write(conn)
|
|
h.logger.Debug(reply)
|
|
h.logger.Error("UDP relay is diabled")
|
|
return
|
|
}
|
|
|
|
if h.chain.IsEmpty() {
|
|
addr := req.Addr.String()
|
|
|
|
bindAddr, _ := net.ResolveUDPAddr("udp", addr)
|
|
relay, err := net.ListenUDP("udp", bindAddr)
|
|
if err != nil {
|
|
h.logger.Error(err)
|
|
return
|
|
}
|
|
defer relay.Close()
|
|
|
|
saddr, _ := gosocks5.NewAddr(relay.LocalAddr().String())
|
|
saddr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
|
|
saddr.Type = 0
|
|
reply := gosocks5.NewReply(gosocks5.Succeeded, saddr)
|
|
if err := reply.Write(conn); err != nil {
|
|
h.logger.Error(err)
|
|
return
|
|
}
|
|
h.logger.Debug(reply)
|
|
|
|
h.logger = h.logger.WithFields(map[string]interface{}{
|
|
"bind": saddr.String(),
|
|
})
|
|
|
|
t := time.Now()
|
|
h.logger.Infof("%s <-> %s", conn.RemoteAddr(), saddr)
|
|
h.tunnelServerUDP(
|
|
socks.UDPTunServerConn(conn),
|
|
relay,
|
|
)
|
|
h.logger.
|
|
WithFields(map[string]interface{}{
|
|
"duration": time.Since(t),
|
|
}).
|
|
Infof("%s >-< %s", conn.RemoteAddr(), saddr)
|
|
|
|
return
|
|
}
|
|
|
|
r := (&chain.Router{}).
|
|
WithChain(h.chain).
|
|
WithRetry(h.md.retryCount).
|
|
WithLogger(h.logger)
|
|
cc, err := r.Connect(ctx)
|
|
if err != nil {
|
|
h.logger.Error(err)
|
|
reply := gosocks5.NewReply(gosocks5.Failure, nil)
|
|
reply.Write(conn)
|
|
h.logger.Debug(reply)
|
|
return
|
|
}
|
|
defer cc.Close()
|
|
|
|
// forward request
|
|
if err := req.Write(cc); err != nil {
|
|
h.logger.Error(err)
|
|
reply := gosocks5.NewReply(gosocks5.Failure, nil)
|
|
reply.Write(conn)
|
|
h.logger.Debug(reply)
|
|
}
|
|
|
|
t := time.Now()
|
|
h.logger.Infof("%s <-> %s", conn.RemoteAddr(), cc.RemoteAddr())
|
|
handler.Transport(conn, cc)
|
|
h.logger.
|
|
WithFields(map[string]interface{}{
|
|
"duration": time.Since(t),
|
|
}).
|
|
Infof("%s >-< %s", conn.RemoteAddr(), cc.RemoteAddr())
|
|
}
|
|
|
|
func (h *socks5Handler) tunnelServerUDP(tunnel, c net.PacketConn) (err error) {
|
|
bufSize := h.md.udpBufferSize
|
|
errc := make(chan error, 2)
|
|
|
|
go func() {
|
|
for {
|
|
err := func() error {
|
|
b := bufpool.Get(bufSize)
|
|
defer bufpool.Put(b)
|
|
|
|
n, raddr, err := tunnel.ReadFrom(b)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if h.bypass != nil && h.bypass.Contains(raddr.String()) {
|
|
h.logger.Warn("bypass: ", raddr)
|
|
return nil
|
|
}
|
|
|
|
if _, err := c.WriteTo(b[:n], raddr); err != nil {
|
|
return err
|
|
}
|
|
|
|
h.logger.Debugf("%s >>> %s data: %d",
|
|
c.LocalAddr(), raddr, n)
|
|
|
|
return nil
|
|
}()
|
|
|
|
if err != nil {
|
|
errc <- err
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
|
|
go func() {
|
|
for {
|
|
err := func() error {
|
|
b := bufpool.Get(bufSize)
|
|
defer bufpool.Put(b)
|
|
|
|
n, raddr, err := c.ReadFrom(b)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if h.bypass != nil && h.bypass.Contains(raddr.String()) {
|
|
h.logger.Warn("bypass: ", raddr)
|
|
return nil
|
|
}
|
|
|
|
if _, err := tunnel.WriteTo(b[:n], raddr); err != nil {
|
|
return err
|
|
}
|
|
h.logger.Debugf("%s <<< %s data: %d",
|
|
c.LocalAddr(), raddr, n)
|
|
|
|
return nil
|
|
}()
|
|
|
|
if err != nil {
|
|
errc <- err
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
|
|
return <-errc
|
|
}
|