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| 1 | +// A Go version WebSocket to TCP socket proxy |
| 2 | +// |
| 3 | +// This is a heavily modified version of this file: |
| 4 | +// https://github.com/novnc/websockify-other/blob/master/golang/websockify.go |
| 5 | +// |
| 6 | +// Changes include: |
| 7 | +// - Fix infinite loop on error. |
| 8 | +// - Proper logging. |
| 9 | +// - Proper error handling in general. |
| 10 | +// - Support both websocket and regular GET requests on /. |
| 11 | +// |
| 12 | +// Copyright 2022 The TokTok team. |
| 13 | +// Copyright 2021 Michael.liu. |
| 14 | +// See LICENSE for licensing conditions. |
| 15 | + |
| 16 | +package main |
| 17 | + |
| 18 | +import ( |
| 19 | + "encoding/hex" |
| 20 | + "flag" |
| 21 | + "log" |
| 22 | + "net" |
| 23 | + "net/http" |
| 24 | + |
| 25 | + "github.com/gorilla/websocket" |
| 26 | +) |
| 27 | + |
| 28 | +var ( |
| 29 | + sourceAddr = flag.String("l", "127.0.0.1:8080", "http service address") |
| 30 | + targetAddr = flag.String("t", "127.0.0.1:5900", "tcp service address") |
| 31 | +) |
| 32 | + |
| 33 | +var upgrader = websocket.Upgrader{ |
| 34 | + // Should be enough to fit any Tox TCP packets. |
| 35 | + ReadBufferSize: 2048, |
| 36 | + WriteBufferSize: 2048, |
| 37 | + Subprotocols: []string{"binary"}, |
| 38 | + CheckOrigin: func(r *http.Request) bool { |
| 39 | + return true |
| 40 | + }, |
| 41 | +} |
| 42 | + |
| 43 | +func forwardTCP(wsconn *websocket.Conn, conn net.Conn) { |
| 44 | + var tcpbuffer [2048]byte |
| 45 | + defer wsconn.Close() |
| 46 | + defer conn.Close() |
| 47 | + for { |
| 48 | + n, err := conn.Read(tcpbuffer[0:]) |
| 49 | + if err != nil { |
| 50 | + log.Println("TCP READ :", err) |
| 51 | + break |
| 52 | + } |
| 53 | + log.Println("TCP READ :", n, hex.EncodeToString(tcpbuffer[0:n])) |
| 54 | + |
| 55 | + if err := wsconn.WriteMessage(websocket.BinaryMessage, tcpbuffer[0:n]); err != nil { |
| 56 | + log.Println("WS WRITE :", err) |
| 57 | + break |
| 58 | + } |
| 59 | + log.Println("WS WRITE :", n) |
| 60 | + } |
| 61 | +} |
| 62 | + |
| 63 | +func forwardWeb(wsconn *websocket.Conn, conn net.Conn) { |
| 64 | + defer wsconn.Close() |
| 65 | + defer conn.Close() |
| 66 | + for { |
| 67 | + _, buffer, err := wsconn.ReadMessage() |
| 68 | + if err != nil { |
| 69 | + log.Println("WS READ :", err) |
| 70 | + break |
| 71 | + } |
| 72 | + log.Println("WS READ :", len(buffer), hex.EncodeToString(buffer)) |
| 73 | + |
| 74 | + m, err := conn.Write(buffer) |
| 75 | + if err != nil { |
| 76 | + log.Println("TCP WRITE:", err) |
| 77 | + break |
| 78 | + } |
| 79 | + log.Println("TCP WRITE:", m) |
| 80 | + } |
| 81 | +} |
| 82 | + |
| 83 | +func serveWs(w http.ResponseWriter, r *http.Request) { |
| 84 | + ws, err := upgrader.Upgrade(w, r, nil) |
| 85 | + if err != nil { |
| 86 | + log.Println("upgrade:", err) |
| 87 | + return |
| 88 | + } |
| 89 | + vnc, err := net.Dial("tcp", *targetAddr) |
| 90 | + if err != nil { |
| 91 | + log.Println("dial:", err) |
| 92 | + return |
| 93 | + } |
| 94 | + go forwardTCP(ws, vnc) |
| 95 | + go forwardWeb(ws, vnc) |
| 96 | + |
| 97 | +} |
| 98 | + |
| 99 | +func main() { |
| 100 | + flag.Parse() |
| 101 | + log.Println("Starting up websockify endpoint") |
| 102 | + |
| 103 | + http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { |
| 104 | + if r.Header.Get("Upgrade") == "websocket" { |
| 105 | + serveWs(w, r) |
| 106 | + } else { |
| 107 | + http.ServeFile(w, r, r.URL.Path[1:]) |
| 108 | + } |
| 109 | + }) |
| 110 | + log.Fatal(http.ListenAndServe(*sourceAddr, nil)) |
| 111 | +} |
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