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udp.go
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udp.go
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package socks
import (
"net"
"github.com/v2ray/v2ray-core/common/alloc"
"github.com/v2ray/v2ray-core/common/log"
v2net "github.com/v2ray/v2ray-core/common/net"
"github.com/v2ray/v2ray-core/proxy/socks/protocol"
)
var udpAddress v2net.Address
func (server *SocksServer) ListenUDP(port uint16) error {
addr := &net.UDPAddr{
IP: net.IP{0, 0, 0, 0},
Port: int(port),
Zone: "",
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
log.Error("Socks failed to listen UDP on port %d: %v", port, err)
return err
}
udpAddress = v2net.IPAddress(server.config.IP(), port)
go server.AcceptPackets(conn)
return nil
}
func (server *SocksServer) getUDPAddr() v2net.Address {
return udpAddress
}
func (server *SocksServer) AcceptPackets(conn *net.UDPConn) error {
for {
buffer := alloc.NewBuffer()
nBytes, addr, err := conn.ReadFromUDP(buffer.Value)
if err != nil {
log.Error("Socks failed to read UDP packets: %v", err)
buffer.Release()
continue
}
log.Info("Client UDP connection from %v", addr)
request, err := protocol.ReadUDPRequest(buffer.Value[:nBytes])
buffer.Release()
if err != nil {
log.Error("Socks failed to parse UDP request: %v", err)
continue
}
if request.Data == nil || request.Data.Len() == 0 {
continue
}
if request.Fragment != 0 {
log.Warning("Dropping fragmented UDP packets.")
// TODO handle fragments
request.Data.Release()
continue
}
udpPacket := v2net.NewPacket(request.Destination(), request.Data, false)
log.Info("Send packet to %s with %d bytes", udpPacket.Destination().String(), request.Data.Len())
go server.handlePacket(conn, udpPacket, addr, request.Address)
}
}
func (server *SocksServer) handlePacket(conn *net.UDPConn, packet v2net.Packet, clientAddr *net.UDPAddr, targetAddr v2net.Address) {
ray := server.dispatcher.DispatchToOutbound(packet)
close(ray.InboundInput())
for data := range ray.InboundOutput() {
response := &protocol.Socks5UDPRequest{
Fragment: 0,
Address: targetAddr,
Data: data,
}
log.Info("Writing back UDP response with %d bytes from %s to %s", data.Len(), targetAddr.String(), clientAddr.String())
udpMessage := alloc.NewSmallBuffer().Clear()
response.Write(udpMessage)
nBytes, err := conn.WriteToUDP(udpMessage.Value, clientAddr)
udpMessage.Release()
response.Data.Release()
if err != nil {
log.Error("Socks failed to write UDP message (%d bytes) to %s: %v", nBytes, clientAddr.String(), err)
}
}
}