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