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connection.go
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connection.go
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package tunnel
import (
"errors"
"net"
"net/netip"
"time"
N "github.com/metacubex/mihomo/common/net"
C "github.com/metacubex/mihomo/constant"
"github.com/metacubex/mihomo/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(inbound, outbound net.Conn) {
N.Relay(inbound, outbound)
}