100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
package v5
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"time"
|
|
|
|
"github.com/go-gost/core/logger"
|
|
"github.com/go-gost/core/observer/stats"
|
|
"github.com/go-gost/gosocks5"
|
|
ctxvalue "github.com/go-gost/x/ctx"
|
|
xnet "github.com/go-gost/x/internal/net"
|
|
"github.com/go-gost/x/internal/net/udp"
|
|
"github.com/go-gost/x/internal/util/socks"
|
|
stats_wrapper "github.com/go-gost/x/observer/stats/wrapper"
|
|
)
|
|
|
|
func (h *socks5Handler) handleUDP(ctx context.Context, conn net.Conn, log logger.Logger) error {
|
|
log = log.WithFields(map[string]any{
|
|
"cmd": "udp",
|
|
})
|
|
|
|
if !h.md.enableUDP {
|
|
reply := gosocks5.NewReply(gosocks5.NotAllowed, nil)
|
|
log.Trace(reply)
|
|
log.Error("socks5: UDP relay is disabled")
|
|
return reply.Write(conn)
|
|
}
|
|
|
|
lc := xnet.ListenConfig{
|
|
Netns: h.options.Netns,
|
|
}
|
|
laddr := &net.UDPAddr{IP: conn.LocalAddr().(*net.TCPAddr).IP, Port: 0} // use out-going interface's IP
|
|
cc, err := lc.ListenPacket(ctx, "udp", laddr.String())
|
|
if err != nil {
|
|
log.Error(err)
|
|
reply := gosocks5.NewReply(gosocks5.Failure, nil)
|
|
log.Trace(reply)
|
|
reply.Write(conn)
|
|
return err
|
|
}
|
|
defer cc.Close()
|
|
|
|
saddr := gosocks5.Addr{}
|
|
saddr.ParseFrom(cc.LocalAddr().String())
|
|
reply := gosocks5.NewReply(gosocks5.Succeeded, &saddr)
|
|
log.Trace(reply)
|
|
if err := reply.Write(conn); err != nil {
|
|
log.Error(err)
|
|
return err
|
|
}
|
|
|
|
log = log.WithFields(map[string]any{
|
|
"bind": fmt.Sprintf("%s/%s", cc.LocalAddr(), cc.LocalAddr().Network()),
|
|
})
|
|
log.Debugf("bind on %s OK", cc.LocalAddr())
|
|
|
|
// obtain a udp connection
|
|
c, err := h.router.Dial(ctx, "udp", "") // UDP association
|
|
if err != nil {
|
|
log.Error(err)
|
|
return err
|
|
}
|
|
defer c.Close()
|
|
|
|
pc, ok := c.(net.PacketConn)
|
|
if !ok {
|
|
err := errors.New("socks5: wrong connection type")
|
|
log.Error(err)
|
|
return err
|
|
}
|
|
|
|
clientID := ctxvalue.ClientIDFromContext(ctx)
|
|
if h.options.Observer != nil {
|
|
pstats := h.stats.Stats(string(clientID))
|
|
pstats.Add(stats.KindTotalConns, 1)
|
|
pstats.Add(stats.KindCurrentConns, 1)
|
|
defer pstats.Add(stats.KindCurrentConns, -1)
|
|
cc = stats_wrapper.WrapPacketConn(cc, pstats)
|
|
}
|
|
|
|
r := udp.NewRelay(socks.UDPConn(cc, h.md.udpBufferSize), pc).
|
|
WithBypass(h.options.Bypass).
|
|
WithLogger(log)
|
|
r.SetBufferSize(h.md.udpBufferSize)
|
|
|
|
go r.Run(ctx)
|
|
|
|
t := time.Now()
|
|
log.Debugf("%s <-> %s", conn.RemoteAddr(), cc.LocalAddr())
|
|
io.Copy(io.Discard, conn)
|
|
log.WithFields(map[string]any{"duration": time.Since(t)}).
|
|
Debugf("%s >-< %s", conn.RemoteAddr(), cc.LocalAddr())
|
|
|
|
return nil
|
|
}
|