package tunnel import ( "errors" "net" "net/netip" "time" N "github.com/Dreamacro/clash/common/net" C "github.com/Dreamacro/clash/constant" "github.com/Dreamacro/clash/log" ) func handleUDPToRemote(packet C.UDPPacket, pc C.PacketConn, metadata *C.Metadata) error { addr := metadata.UDPAddr() if addr == nil { return errors.New("udp addr invalid") } if _, err := pc.WriteTo(packet.Data(), addr); err != nil { return err } // reset timeout _ = pc.SetReadDeadline(time.Now().Add(udpTimeout)) return nil } func handleUDPToLocal(writeBack C.WriteBack, pc N.EnhancePacketConn, key string, oAddrPort netip.AddrPort, fAddr netip.Addr) { defer func() { _ = pc.Close() closeAllLocalCoon(key) natTable.Delete(key) }() for { _ = pc.SetReadDeadline(time.Now().Add(udpTimeout)) data, put, from, err := pc.WaitReadFrom() if err != nil { return } fromUDPAddr, isUDPAddr := from.(*net.UDPAddr) if !isUDPAddr { fromUDPAddr = net.UDPAddrFromAddrPort(oAddrPort) // oAddrPort was Unmapped log.Warnln("server return a [%T](%s) which isn't a *net.UDPAddr, force replace to (%s), this may be caused by a wrongly implemented server", from, from, oAddrPort) } else if fromUDPAddr == nil { fromUDPAddr = net.UDPAddrFromAddrPort(oAddrPort) // oAddrPort was Unmapped log.Warnln("server return a nil *net.UDPAddr, force replace to (%s), this may be caused by a wrongly implemented server", oAddrPort) } else { _fromUDPAddr := *fromUDPAddr fromUDPAddr = &_fromUDPAddr // make a copy if fromAddr, ok := netip.AddrFromSlice(fromUDPAddr.IP); ok { fromAddr = fromAddr.Unmap() if fAddr.IsValid() && (oAddrPort.Addr() == fromAddr) { // oAddrPort was Unmapped fromAddr = fAddr.Unmap() } fromUDPAddr.IP = fromAddr.AsSlice() if fromAddr.Is4() { fromUDPAddr.Zone = "" // only ipv6 can have the zone } } } _, err = writeBack.WriteBack(data, fromUDPAddr) if put != nil { put() } if err != nil { return } } } func closeAllLocalCoon(lAddr string) { natTable.RangeForLocalConn(lAddr, func(key string, value *net.UDPConn) bool { conn := value conn.Close() log.Debugln("Closing TProxy local conn... lAddr=%s rAddr=%s", lAddr, key) return true }) } func handleSocket(ctx C.ConnContext, outbound net.Conn) { N.Relay(ctx.Conn(), outbound) }