62 lines
1.2 KiB
Go
62 lines
1.2 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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"github.com/Dreamacro/clash/common/pool"
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C "github.com/Dreamacro/clash/constant"
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)
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func handleUDPToRemote(packet C.UDPPacket, pc C.PacketConn, metadata *C.Metadata) error {
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defer packet.Drop()
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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(packet C.UDPPacket, pc net.PacketConn, key string, oAddr, fAddr netip.Addr) {
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buf := pool.Get(pool.UDPBufferSize)
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defer pool.Put(buf)
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defer natTable.Delete(key)
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defer pc.Close()
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for {
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pc.SetReadDeadline(time.Now().Add(udpTimeout))
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n, from, err := pc.ReadFrom(buf)
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if err != nil {
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return
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}
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fromUDPAddr := from.(*net.UDPAddr)
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if fAddr.IsValid() {
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fromAddr, _ := netip.AddrFromSlice(fromUDPAddr.IP)
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fromAddr.Unmap()
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if oAddr == fromAddr {
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fromUDPAddr.IP = fAddr.AsSlice()
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}
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}
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_, err = packet.WriteBack(buf[:n], fromUDPAddr)
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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 handleSocket(ctx C.ConnContext, outbound net.Conn) {
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N.Relay(ctx.Conn(), outbound)
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}
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