mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-06-10 09:50:43 +00:00
99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
package socks
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import (
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"net"
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"github.com/v2ray/v2ray-core/common/alloc"
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"github.com/v2ray/v2ray-core/common/log"
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v2net "github.com/v2ray/v2ray-core/common/net"
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"github.com/v2ray/v2ray-core/proxy/socks/protocol"
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)
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func (this *SocksServer) ListenUDP(port v2net.Port) error {
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addr := &net.UDPAddr{
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IP: net.IP{0, 0, 0, 0},
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Port: int(port),
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Zone: "",
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}
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conn, err := net.ListenUDP("udp", addr)
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if err != nil {
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log.Error("Socks failed to listen UDP on port %d: %v", port, err)
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return err
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}
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this.udpAddress = v2net.UDPDestination(v2net.IPAddress(this.config.IP()), port)
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this.udpConn = conn
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go this.AcceptPackets()
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return nil
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}
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func (this *SocksServer) AcceptPackets() error {
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for this.accepting {
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buffer := alloc.NewBuffer()
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this.udpMutex.RLock()
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if !this.accepting {
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this.udpMutex.RUnlock()
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return nil
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}
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nBytes, addr, err := this.udpConn.ReadFromUDP(buffer.Value)
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this.udpMutex.RUnlock()
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if err != nil {
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log.Error("Socks failed to read UDP packets: %v", err)
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buffer.Release()
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continue
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}
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log.Info("Client UDP connection from %v", addr)
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request, err := protocol.ReadUDPRequest(buffer.Value[:nBytes])
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buffer.Release()
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if err != nil {
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log.Error("Socks failed to parse UDP request: %v", err)
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continue
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}
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if request.Data == nil || request.Data.Len() == 0 {
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continue
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}
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if request.Fragment != 0 {
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log.Warning("Dropping fragmented UDP packets.")
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// TODO handle fragments
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request.Data.Release()
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continue
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}
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udpPacket := v2net.NewPacket(request.Destination(), request.Data, false)
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log.Info("Send packet to %s with %d bytes", udpPacket.Destination().String(), request.Data.Len())
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go this.handlePacket(udpPacket, addr, request.Address, request.Port)
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}
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return nil
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}
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func (this *SocksServer) handlePacket(packet v2net.Packet, clientAddr *net.UDPAddr, targetAddr v2net.Address, port v2net.Port) {
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ray := this.space.PacketDispatcher().DispatchToOutbound(packet)
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close(ray.InboundInput())
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for data := range ray.InboundOutput() {
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response := &protocol.Socks5UDPRequest{
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Fragment: 0,
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Address: targetAddr,
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Port: port,
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Data: data,
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}
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log.Info("Writing back UDP response with %d bytes from %s to %s", data.Len(), targetAddr.String(), clientAddr.String())
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udpMessage := alloc.NewSmallBuffer().Clear()
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response.Write(udpMessage)
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this.udpMutex.RLock()
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if !this.accepting {
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this.udpMutex.RUnlock()
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return
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}
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nBytes, err := this.udpConn.WriteToUDP(udpMessage.Value, clientAddr)
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this.udpMutex.RUnlock()
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udpMessage.Release()
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response.Data.Release()
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if err != nil {
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log.Error("Socks failed to write UDP message (%d bytes) to %s: %v", nBytes, clientAddr.String(), err)
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}
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}
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}
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