85 lines
2.0 KiB
Go
85 lines
2.0 KiB
Go
package v5
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import (
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"context"
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"net"
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"time"
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"github.com/go-gost/core/logger"
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"github.com/go-gost/gosocks5"
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ctxvalue "github.com/go-gost/x/ctx"
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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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"github.com/go-gost/x/stats"
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stats_wrapper "github.com/go-gost/x/stats/wrapper"
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)
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func (h *socks5Handler) handleUDPTun(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) error {
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log = log.WithFields(map[string]any{
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"cmd": "udp-tun",
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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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if bindAddr.Port == 0 {
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// relay mode
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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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} else {
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// 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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}
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pc, err := net.ListenUDP(network, bindAddr)
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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 pc.Close()
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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 := ctxvalue.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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WithLogger(log)
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r.SetBufferSize(h.md.udpBufferSize)
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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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