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uoosef
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Aug 29, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
| "net" | ||
| ) | ||
|
|
||
| var ( | ||
| activeTunnels = make(map[string]chan []byte) | ||
| udpToTCPChannels = make(map[string]chan []byte) | ||
| ) | ||
|
|
||
| func chanFromConn(conn net.Conn) chan []byte { | ||
| c := make(chan []byte) | ||
|
|
||
| go func() { | ||
| b := make([]byte, 256*1024) | ||
|
|
||
| for { | ||
| n, err := conn.Read(b) | ||
| if n > 0 { | ||
| c <- b[:n] | ||
| } | ||
| if err != nil { | ||
| log.Printf("Connection closed: %v--->%v\r\n", conn.LocalAddr(), conn.RemoteAddr()) | ||
| c <- nil | ||
| break | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| return c | ||
| } | ||
|
|
||
| func handleUDPOverTCP(conn net.Conn, destination string) { | ||
| writeToWebsocketChannel := make(chan []byte) | ||
| activeTunnels[destination] = writeToWebsocketChannel | ||
| wsReadDataChan := chanFromConn(conn) | ||
|
|
||
| defer conn.Close() | ||
| defer delete(activeTunnels, destination) | ||
| for { | ||
| select { | ||
| case dataThatReceivedFromWebsocket := <-wsReadDataChan: | ||
| if dataThatReceivedFromWebsocket == nil { | ||
| return | ||
| } else { | ||
| c, err := getOrCreateUDPChanFromWebSocketPacket(dataThatReceivedFromWebsocket, destination) | ||
| if err == nil { | ||
| c <- dataThatReceivedFromWebsocket | ||
| } else { | ||
| log.Printf("unable to create connection to destination network: %v\r\n", err) | ||
| } | ||
| } | ||
| case dataThatReceivedFromUDPChan := <-activeTunnels[destination]: | ||
| // it never is null | ||
| if dataThatReceivedFromUDPChan != nil { | ||
| _, err := conn.Write(dataThatReceivedFromUDPChan) | ||
| if err != nil { | ||
| log.Printf("unable to write on destination network: %v\r\n", err) | ||
| return | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func getOrCreateUDPChanFromWebSocketPacket(packet []byte, destination string) (chan []byte, error) { | ||
| // the first 8 byte of each packet is user random id(6bytes) + channel id(2bytes) | ||
| if len(packet) < 8 { | ||
| return nil, fmt.Errorf("too small packet") | ||
| } | ||
| packetHeader := packet[:8] | ||
| channelID := destination + string(packetHeader) | ||
| if udpWriteChan, ok := udpToTCPChannels[channelID]; ok { | ||
| return udpWriteChan, nil | ||
| } | ||
| udpConn, err := net.Dial("udp", destination) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| udpToTCPChannels[channelID] = make(chan []byte) | ||
| udpReadChanFromConn := chanFromConn(udpConn) | ||
| go func() { | ||
| for { | ||
| select { | ||
| case dataThatReceivedFromWebsocketThroughChannel := <-udpToTCPChannels[channelID]: | ||
| _, err := udpConn.Write(dataThatReceivedFromWebsocketThroughChannel[8:]) | ||
| if err != nil { | ||
| fmt.Print("fuck") | ||
| delete(udpToTCPChannels, channelID) | ||
| return | ||
| } | ||
| case dataThatReceivedFromUDPReadChan := <-udpReadChanFromConn: | ||
| if dataThatReceivedFromUDPReadChan == nil { | ||
| fmt.Print("fuck2") | ||
| delete(udpToTCPChannels, channelID) | ||
| return | ||
| } | ||
| if c, ok := activeTunnels[destination]; ok { | ||
| // no need to send userid | ||
| c <- append(packetHeader[6:], dataThatReceivedFromUDPReadChan...) | ||
| } | ||
| } | ||
| } | ||
| }() | ||
| return udpToTCPChannels[channelID], nil | ||
| } |
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