87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
package tunnel
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import (
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"errors"
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"net"
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"net/netip"
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"time"
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N "github.com/Dreamacro/clash/common/net"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/clash/log"
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)
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func handleUDPToRemote(packet C.UDPPacket, pc C.PacketConn, metadata *C.Metadata) error {
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addr := metadata.UDPAddr()
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if addr == nil {
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return errors.New("udp addr invalid")
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}
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if _, err := pc.WriteTo(packet.Data(), addr); err != nil {
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return err
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}
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// reset timeout
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_ = pc.SetReadDeadline(time.Now().Add(udpTimeout))
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return nil
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}
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func handleUDPToLocal(writeBack C.WriteBack, pc N.EnhancePacketConn, key string, oAddrPort netip.AddrPort, fAddr netip.Addr) {
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defer func() {
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_ = pc.Close()
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closeAllLocalCoon(key)
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natTable.Delete(key)
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}()
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for {
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_ = pc.SetReadDeadline(time.Now().Add(udpTimeout))
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data, put, from, err := pc.WaitReadFrom()
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if err != nil {
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return
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}
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fromUDPAddr, isUDPAddr := from.(*net.UDPAddr)
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if !isUDPAddr {
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fromUDPAddr = net.UDPAddrFromAddrPort(oAddrPort) // oAddrPort was Unmapped
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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)
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} else if fromUDPAddr == nil {
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fromUDPAddr = net.UDPAddrFromAddrPort(oAddrPort) // oAddrPort was Unmapped
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log.Warnln("server return a nil *net.UDPAddr, force replace to (%s), this may be caused by a wrongly implemented server", oAddrPort)
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} else {
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_fromUDPAddr := *fromUDPAddr
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fromUDPAddr = &_fromUDPAddr // make a copy
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if fromAddr, ok := netip.AddrFromSlice(fromUDPAddr.IP); ok {
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fromAddr = fromAddr.Unmap()
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if fAddr.IsValid() && (oAddrPort.Addr() == fromAddr) { // oAddrPort was Unmapped
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fromAddr = fAddr.Unmap()
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}
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fromUDPAddr.IP = fromAddr.AsSlice()
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if fromAddr.Is4() {
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fromUDPAddr.Zone = "" // only ipv6 can have the zone
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}
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}
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}
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_, err = writeBack.WriteBack(data, fromUDPAddr)
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if put != nil {
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put()
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}
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if err != nil {
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return
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}
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}
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}
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func closeAllLocalCoon(lAddr string) {
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natTable.RangeForLocalConn(lAddr, func(key string, value *net.UDPConn) bool {
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conn := value
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conn.Close()
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log.Debugln("Closing TProxy local conn... lAddr=%s rAddr=%s", lAddr, key)
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return true
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})
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}
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func handleSocket(ctx C.ConnContext, outbound net.Conn) {
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N.Relay(ctx.Conn(), outbound)
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}
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