Mercurial > hg > rlgwebd
annotate webtty @ 201:f3843245a35e
Initial support for TLS.
RLGWebD now serves via encrypted connections on port 8081.
The client-side script now uses secure WebSockets if the page is being
accessed via HTTPS.
author | John "Elwin" Edwards |
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date | Sun, 01 Jan 2017 20:18:01 -0500 |
parents | 3bdee6371c3f |
children |
rev | line source |
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1 #!/usr/bin/env node |
137 | 2 |
3 var localModules = '/usr/lib/node_modules/'; | |
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4 var http = require('http'); |
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5 var url = require('url'); |
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6 var path = require('path'); |
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7 var fs = require('fs'); |
137 | 8 var pty = require(path.join(localModules, "pty.js")); |
140 | 9 var child_process = require("child_process"); |
10 var webSocketServer = require(path.join(localModules, "websocket")).server; | |
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11 |
137 | 12 var serveStaticRoot = fs.realpathSync("."); |
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13 var sessions = {}; |
153 | 14 var nsessid = 0; |
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15 |
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16 var env_dontuse = {"TMUX": true, "TMUX_PANE": true}; |
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17 |
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18 /* Constructor for TermSessions. Note that it opens the terminal and |
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19 * adds itself to the sessions dict. |
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20 */ |
140 | 21 function TermSessionWS(conn, h, w) { |
22 var ss = this; | |
23 /* Set up the sizes. */ | |
24 w = Math.floor(Number(w)); | |
25 if (!(w > 0 && w < 256)) | |
26 w = 80; | |
27 this.w = w; | |
28 h = Math.floor(Number(h)); | |
29 if (!(h > 0 && h < 256)) | |
30 h = 25; | |
31 this.h = h; | |
32 this.conn = conn; | |
33 /* Customize the environment. */ | |
34 var childenv = {}; | |
35 for (var key in process.env) { | |
36 if (!(key in env_dontuse)) | |
37 childenv[key] = process.env[key]; | |
38 } | |
39 var spawnopts = {"env": childenv, "cwd": process.env["HOME"], | |
40 "rows": this.h, "cols": this.w}; | |
41 this.term = pty.spawn("bash", [], spawnopts); | |
42 this.alive = true; | |
43 this.term.on("data", function (datastr) { | |
44 var buf = new Buffer(datastr); | |
45 if (ss.conn.connected) | |
46 ss.conn.sendUTF(JSON.stringify({"t": "d", "d": buf.toString("hex")})); | |
47 }); | |
48 this.term.on("exit", function () { | |
49 ss.alive = false; | |
50 /* Wait for all the data to get collected */ | |
51 setTimeout(ss.cleanup, 1000); | |
52 }); | |
53 this.conn.on("message", function (msg) { | |
54 try { | |
55 var msgObj = JSON.parse(msg.utf8Data); | |
56 } | |
57 catch (e) { | |
58 return; | |
59 } | |
60 if (msgObj.t == "d") { | |
61 var hexstr = msgObj["d"].replace(/[^0-9a-f]/gi, ""); | |
62 if (hexstr.length % 2 != 0) { | |
63 return; | |
64 } | |
65 var keybuf = new Buffer(hexstr, "hex"); | |
66 ss.term.write(keybuf); | |
67 } | |
68 }); | |
69 this.conn.on("close", function (msg) { | |
70 if (ss.alive) | |
71 ss.term.kill('SIGHUP'); | |
72 console.log("WebSocket connection closed."); | |
73 }); | |
74 this.cleanup = function () { | |
75 /* Call this when the child is dead. */ | |
76 if (ss.alive) | |
77 return; | |
78 if (ss.conn.connected) { | |
79 ss.conn.sendUTF(JSON.stringify({"t": "q"})); | |
80 } | |
81 }; | |
153 | 82 sessions[nsessid++] = this; |
140 | 83 this.conn.sendUTF(JSON.stringify({"t": "l", "w": w, "h": h})); |
84 console.log("New WebSocket connection."); | |
85 } | |
86 | |
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87 function randkey() { |
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88 rnum = Math.floor(Math.random() * 65536 * 65536); |
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89 hexstr = rnum.toString(16); |
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90 while (hexstr.length < 8) |
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91 hexstr = "0" + hexstr; |
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92 return hexstr; |
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93 } |
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94 |
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95 /* Returns a list of the cookies in the request, obviously. */ |
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96 function getCookies(req) { |
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97 cookies = []; |
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98 if ("cookie" in req.headers) { |
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99 cookstrs = req.headers["cookie"].split("; "); |
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100 for (var i = 0; i < cookstrs.length; i++) { |
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101 eqsign = cookstrs[i].indexOf("="); |
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102 if (eqsign > 0) { |
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103 name = cookstrs[i].slice(0, eqsign).toLowerCase(); |
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104 val = cookstrs[i].slice(eqsign + 1); |
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105 cookies[name] = val; |
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106 } |
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107 else if (eqsign < 0) |
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108 cookies[cookstrs[i]] = null; |
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109 } |
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110 } |
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111 return cookies; |
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112 } |
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113 |
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114 function urlDec(encstr) { |
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115 var decstr = ""; |
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116 var tnum; |
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117 for (var i = 0; i < encstr.length; i++) |
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118 { |
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119 if (encstr.charAt(i) == "+") |
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120 decstr += " "; |
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121 else if (encstr.charAt(i) == "%") |
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122 { |
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123 tnum = Number("0x" + encstr.slice(i + 1, 2)); |
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124 if (!isNaN(tnum) && tnum >= 0) |
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125 decstr += String.fromCharCode(tnum); |
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126 i += 2; |
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127 } |
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128 else |
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129 decstr += encstr.charAt(i); |
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130 } |
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131 return decstr; |
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132 } |
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133 |
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134 /* Returns the contents of a form */ |
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135 function getFormValues(formtext) { |
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136 var jsonobj; |
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137 try { |
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138 jsonobj = JSON.parse(formtext); |
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139 } catch (e) { |
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140 if (e instanceof SyntaxError) |
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141 return null; |
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142 } |
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143 return jsonobj; |
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144 } |
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145 |
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146 function serveStatic(req, res, fname) { |
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147 var nname = path.normalize(fname); |
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148 if (nname == "" || nname == "/") |
177 | 149 nname = "index-sh.html"; |
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150 if (nname.match(/\/$/)) |
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151 path.join(nname, "index.html"); /* it was a directory */ |
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152 var realname = path.join(serveStaticRoot, nname); |
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153 var extension = path.extname(realname); |
81 | 154 fs.exists(realname, function (exists) { |
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155 var resheaders = {}; |
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156 if (!exists || !extension || extension == ".html") |
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157 resheaders["Content-Type"] = "text/html"; |
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158 else if (extension == ".png") |
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159 resheaders["Content-Type"] = "image/png"; |
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160 else if (extension == ".css") |
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161 resheaders["Content-Type"] = "text/css"; |
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162 else if (extension == ".js") |
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163 resheaders["Content-Type"] = "text/javascript"; |
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164 else if (extension == ".svg") |
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165 resheaders["Content-Type"] = "image/svg+xml"; |
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166 else |
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167 resheaders["Content-Type"] = "application/octet-stream"; |
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168 if (exists) { |
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169 /* Not nice, not sensible. First see if it's readable, then respond |
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170 * 200 or 500. Don't throw nasty errors. */ |
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171 res.writeHead(200, resheaders); |
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172 fs.readFile(realname, function (error, data) { |
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173 if (error) throw error; |
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174 res.write(data); |
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175 res.end(); |
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176 }); |
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177 } |
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178 else { |
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179 res.writeHead(404, resheaders); |
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180 res.write("<html><head><title>" + nname + "</title></head>\n<body><h1>" + nname + " Not Found</h1></body></html>\n"); |
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181 res.end(); |
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182 } |
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183 }); |
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184 return; |
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185 } |
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186 |
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187 var errorcodes = [ "Generic Error", "Not logged in", "Invalid data" ]; |
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188 |
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189 function sendError(res, ecode) { |
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190 res.writeHead(200, { "Content-Type": "text/plain" }); |
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191 if (!(ecode >= 0 && ecode < errorcodes.length)) |
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192 ecode = 0; |
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193 res.write(JSON.stringify({"t": "E", "c": ecode, "s": errorcodes[ecode]})); |
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194 res.end(); |
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195 } |
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196 |
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197 function handler(req, res) { |
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198 /* default headers for the response */ |
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199 var resheaders = {'Content-Type': 'text/html'}; |
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200 /* The request body will be added to this as it arrives. */ |
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201 var reqbody = ""; |
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202 var formdata; |
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203 |
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204 /* Register a listener to get the body. */ |
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205 function moredata(chunk) { |
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206 reqbody += chunk; |
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207 } |
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208 req.on('data', moredata); |
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209 |
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210 /* This will send the response once the whole request is here. */ |
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211 function respond() { |
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212 var target = url.parse(req.url).pathname; |
153 | 213 /* Currently only static files and WebSockets are needed. */ |
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214 if (req.method == 'POST') { |
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215 formdata = getFormValues(reqbody); |
153 | 216 res.writeHead(405, resheaders); |
217 res.end(); | |
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218 } |
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219 else if (req.method == 'GET' || req.method == 'HEAD') { |
153 | 220 serveStatic(req, res, target); |
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221 } |
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222 else { /* Some other method */ |
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223 res.writeHead(501, resheaders); |
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224 res.write("<html><head><title>501</title></head>\n<body><h1>501 Not Implemented</h1></body></html>\n"); |
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225 res.end(); |
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226 } |
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227 return; |
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228 } |
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229 req.on('end', respond); |
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230 } |
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231 |
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232 process.on("exit", function () { |
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233 for (var sessid in sessions) { |
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234 if (sessions[sessid].alive) |
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235 sessions[sessid].term.kill('SIGHUP'); |
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236 } |
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237 console.log("Quitting..."); |
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238 return; |
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239 }); |
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240 |
140 | 241 function wsRespond(req) { |
242 var w, h, conn; | |
243 if (req.resourceURL.pathname == "/sock") { | |
244 w = parseInt(req.resourceURL.query.w); | |
245 if (isNaN(w) || w <= 0 || w > 256) | |
246 w = 80; | |
247 h = parseInt(req.resourceURL.query.h); | |
248 if (isNaN(h) || h <= 0 || h > 256) | |
249 h = 25; | |
250 conn = req.accept(null, req.origin); | |
251 new TermSessionWS(conn, h, w); | |
252 } | |
253 else { | |
254 req.reject(404, "No such resource."); | |
255 } | |
256 } | |
257 | |
258 /* The pty.js module doesn't wait for the processes it spawns, so they | |
259 * become zombies, which leads to unpleasantness when the system runs | |
260 * out of process table entries. But if the child_process module is | |
261 * initialized and a child spawned, node will continue waiting for any | |
262 * children. | |
263 * Someday, some developer will get the bright idea of tracking how many | |
264 * processes the child_process module has spawned, and not waiting if | |
265 * it's zero. Until then, the following useless line will protect us | |
266 * from the zombie hordes. | |
267 * Figuring this out was almost as interesting as the Rogue bug where | |
268 * printf debugging altered whether the high score list was checked. | |
269 */ | |
270 child_process.spawn("/bin/true"); | |
271 | |
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272 process.env["TERM"] = "xterm-256color"; |
140 | 273 var webServer = http.createServer(handler); |
274 webServer.listen(8080, "127.0.0.1"); | |
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275 console.log('Server running at http://127.0.0.1:8080/'); |
140 | 276 var wsServer = new webSocketServer({"httpServer": webServer}); |
277 wsServer.on("request", wsRespond); | |
278 console.log('WebSockets online'); |