82 lines
1.8 KiB
Go
82 lines
1.8 KiB
Go
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(packet C.UDPPacket, pc N.EnhancePacketConn, key string, oAddr, 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 := from.(*net.UDPAddr)
|
|
_fromUDPAddr := *fromUDPAddr
|
|
fromUDPAddr = &_fromUDPAddr // make a copy
|
|
if fromAddr, ok := netip.AddrFromSlice(fromUDPAddr.IP); ok {
|
|
fromAddr = fromAddr.Unmap()
|
|
if fAddr.IsValid() && (oAddr.Unmap() == fromAddr) {
|
|
fromAddr = fAddr.Unmap()
|
|
}
|
|
fromUDPAddr.IP = fromAddr.AsSlice()
|
|
if fromAddr.Is4() {
|
|
fromUDPAddr.Zone = "" // only ipv6 can have the zone
|
|
}
|
|
}
|
|
|
|
_, err = packet.WriteBack(data, fromUDPAddr)
|
|
if put != nil {
|
|
put()
|
|
}
|
|
if err != nil {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func closeAllLocalCoon(lAddr string) {
|
|
natTable.RangeLocalConn(lAddr, func(key, value any) bool {
|
|
conn, ok := value.(*net.UDPConn)
|
|
if !ok || conn == nil {
|
|
log.Debugln("Value %#v unknown value when closing TProxy local conn...", conn)
|
|
return true
|
|
}
|
|
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)
|
|
}
|