85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
package v5
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import (
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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/logger"
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"github.com/go-gost/gosocks5"
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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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)
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func (h *socks5Handler) handleUDP(ctx context.Context, conn net.Conn, 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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cc, err := net.ListenUDP("udp", nil)
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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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saddr.Type = 0
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saddr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String()) // replace the IP to the out-going interface's
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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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c, err := h.router.Dial(ctx, "udp", "") // UDP association
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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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r := udp.NewRelay(socks.UDPConn(cc, h.md.udpBufferSize), 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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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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