ginuerzh
150 lines
3.8 KiB
Go
150 lines
3.8 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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"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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xctx "github.com/go-gost/x/ctx"
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ictx "github.com/go-gost/x/internal/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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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) handleUDPTun(ctx context.Context, conn net.Conn, network, address string, ro *xrecorder.HandlerRecorderObject, log logger.Logger) error {
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log = log.WithFields(map[string]any{
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"network": network,
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"cmd": "udp-tun",
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})
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{
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clientID := xctx.ClientIDFromContext(ctx)
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rw := traffic_wrapper.WrapReadWriter(
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h.limiter,
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conn,
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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(network),
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limiter.AddrOption(address),
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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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rw = stats_wrapper.WrapReadWriter(rw, pstats)
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}
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conn = xnet.NewReadWriteConn(rw, rw, conn)
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}
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bindAddr, _ := net.ResolveUDPAddr(network, address)
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if bindAddr == nil {
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bindAddr = &net.UDPAddr{}
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}
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var pc net.PacketConn
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// relay mode
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if bindAddr.Port == 0 {
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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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// obtain a udp connection
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var buf bytes.Buffer
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c, err := h.options.Router.Dial(ictx.ContextWithBuffer(ctx, &buf), network, "") // 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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var ok bool
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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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} else { // BIND mode
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if !h.md.enableBind {
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reply := gosocks5.NewReply(gosocks5.NotAllowed, nil)
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log.Trace(reply)
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log.Error("socks5: BIND 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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var err error
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pc, err = lc.ListenPacket(ctx, network, bindAddr.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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}
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defer pc.Close()
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log = log.WithFields(map[string]any{
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"src": pc.LocalAddr().String(),
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"bind": pc.LocalAddr().String(),
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})
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ro.SrcAddr = pc.LocalAddr().String()
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saddr := gosocks5.Addr{}
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saddr.ParseFrom(pc.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.Debugf("bind on %s OK", pc.LocalAddr())
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clientID := xctx.ClientIDFromContext(ctx)
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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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conn = stats_wrapper.WrapConn(conn, pstats)
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}
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r := udp.NewRelay(socks.UDPTunServerConn(conn), pc).
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WithBypass(h.options.Bypass).
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WithBufferSize(h.md.udpBufferSize).
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WithLogger(log)
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t := time.Now()
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log.Debugf("%s <-> %s", conn.RemoteAddr(), pc.LocalAddr())
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r.Run(ctx)
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log.WithFields(map[string]any{
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"duration": time.Since(t),
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}).Debugf("%s >-< %s", conn.RemoteAddr(), pc.LocalAddr())
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return nil
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}
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