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90 lines
2.4 KiB
90 lines
2.4 KiB
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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var udpAddress v2net.Address
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func (server *SocksServer) ListenUDP(port uint16) 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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udpAddress = v2net.IPAddress(server.config.IP(), port)
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go server.AcceptPackets(conn)
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return nil
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}
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func (server *SocksServer) getUDPAddr() v2net.Address {
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return udpAddress
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}
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func (server *SocksServer) AcceptPackets(conn *net.UDPConn) error {
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for {
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buffer := alloc.NewBuffer()
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nBytes, addr, err := conn.ReadFromUDP(buffer.Value)
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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 server.handlePacket(conn, udpPacket, addr, request.Address)
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}
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}
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func (server *SocksServer) handlePacket(conn *net.UDPConn, packet v2net.Packet, clientAddr *net.UDPAddr, targetAddr v2net.Address) {
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ray := server.dispatcher.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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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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nBytes, err := conn.WriteToUDP(udpMessage.Value, clientAddr)
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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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