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75 lines
2.3 KiB
75 lines
2.3 KiB
package socks
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import (
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"v2ray.com/core/common/alloc"
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"v2ray.com/core/common/log"
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v2net "v2ray.com/core/common/net"
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"v2ray.com/core/proxy"
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"v2ray.com/core/proxy/socks/protocol"
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"v2ray.com/core/transport/internet/udp"
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)
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func (this *Server) listenUDP() error {
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this.udpServer = udp.NewUDPServer(this.meta, this.packetDispatcher)
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udpHub, err := udp.ListenUDP(this.meta.Address, this.meta.Port, udp.ListenOption{Callback: this.handleUDPPayload})
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if err != nil {
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log.Error("Socks: Failed to listen on udp ", this.meta.Address, ":", this.meta.Port)
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return err
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}
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this.udpMutex.Lock()
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this.udpAddress = v2net.UDPDestination(this.config.GetNetAddress(), this.meta.Port)
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this.udpHub = udpHub
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this.udpMutex.Unlock()
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return nil
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}
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func (this *Server) handleUDPPayload(payload *alloc.Buffer, session *proxy.SessionInfo) {
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source := session.Source
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log.Info("Socks: Client UDP connection from ", source)
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request, err := protocol.ReadUDPRequest(payload.Value)
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payload.Release()
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if err != nil {
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log.Error("Socks: Failed to parse UDP request: ", err)
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return
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}
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if request.Data.Len() == 0 {
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request.Data.Release()
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return
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}
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if request.Fragment != 0 {
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log.Warning("Socks: Dropping fragmented UDP packets.")
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// TODO handle fragments
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request.Data.Release()
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return
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}
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log.Info("Socks: Send packet to ", request.Destination(), " with ", request.Data.Len(), " bytes")
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log.Access(source, request.Destination, log.AccessAccepted, "")
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this.udpServer.Dispatch(&proxy.SessionInfo{Source: source, Destination: request.Destination()}, request.Data, func(destination v2net.Destination, payload *alloc.Buffer) {
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response := &protocol.Socks5UDPRequest{
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Fragment: 0,
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Address: request.Destination().Address,
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Port: request.Destination().Port,
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Data: payload,
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}
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log.Info("Socks: Writing back UDP response with ", payload.Len(), " bytes to ", destination)
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udpMessage := alloc.NewLocalBuffer(2048).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.udpHub.WriteTo(udpMessage.Value, destination)
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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 (", nBytes, " bytes) to ", destination, ": ", err)
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}
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})
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}
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