Mercurial > hg > rlgwebd

changeset 8:ad0a31e52007

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Call the dgl replacement rlgwebd instead of webttyd.
author John "Elwin" Edwards <elwin@sdf.org>
date Mon, 07 May 2012 16:08:59 -0700
parents d1b3c3af34d6
children 826a7ced69f8
files index-rlg.html rlgwebd.js webttyd.js
diffstat 3 files changed, 528 insertions(+), 533 deletions(-) [+]
line wrap: on
line diff
--- a/index-rlg.html	Mon May 07 16:03:10 2012 -0700
+++ b/index-rlg.html	Mon May 07 16:08:59 2012 -0700
@@ -1,14 +1,14 @@
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
 <html>
 <head>
-<title>WebTTY</title>
+<title>RLG-Web</title>
 <script type="text/javascript" src="termemu.js"></script>
 <script type="text/javascript" src="termemu-keys.js"></script>
 <script type="text/javascript" src="rlgterm.js"></script>
 <link rel="stylesheet" type="text/css" href="tty.css">
 </head>
 <body onload="setup()" onkeydown="sendkey(event)">
-<h1>WebTTY</h1>
+<h1>RLG-Web</h1>
 <div id ="top">
   <span id="ttitle"></span>
   <img src="/bell.png" alt="bell" id="bell">
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rlgwebd.js	Mon May 07 16:08:59 2012 -0700
@@ -0,0 +1,526 @@
+#!/usr/bin/env node
+
+// If you can't quite trust node to find it on its own
+var localModules = '/usr/local/lib/node_modules/';
+var http = require('http');
+var url = require('url');
+var path = require('path');
+var fs = require('fs');
+var child_process = require('child_process');
+var daemon = require(path.join(localModules, "daemon"));
+
+var chrootDir = "/var/dgl/";
+var dropToUID = 501;
+var dropToGID = 501;
+var serveStaticRoot = "/var/www/"; // inside the chroot
+var passwdfile = "/dgldir/dgl-login";
+var sessions = {};
+
+var games = {
+  "rogue3": {
+    "name": "Rogue V3",
+    "uname": "rogue3",
+    "path": "/bin/rogue3"
+  },
+  "rogue4": {
+    "name": "Rogue V4",
+    "uname": "rogue4",
+    "path": "/bin/rogue4"
+  },
+  "rogue5": {
+    "name": "Rogue V5",
+    "uname": "rogue5",
+    "path": "/bin/rogue5"
+  },
+  "srogue": {
+    "name": "Super-Rogue",
+    "uname": "srogue",
+    "path": "/bin/srogue"
+  }
+};
+
+/* Constructor for TermSessions.  Note that it opens the terminal and 
+ * adds itself to the sessions dict. It currently assumes the user has
+ * been authenticated.
+ */
+function TermSession(game, user, files) {
+  /* First make sure starting the game will work. */
+  if (!(game in games)) {
+    // TODO: throw an exception instead
+    return null;
+  }
+  /* This order seems to best avoid race conditions... */
+  this.alive = false;
+  this.sessid = randkey();
+  while (this.sessid in sessions) {
+    this.sessid = randkey();
+  }
+  /* Grab a spot in the sessions table. */
+  sessions[this.sessid] = this;
+  /* TODO handle tty-opening errors */
+  /* TODO make argument-finding into a method */
+  args = [games[game].path, "-n", user.toString()];
+  this.child = child_process.spawn("/bin/ptyhelper", args);
+  var ss = this;
+  this.alive = true;
+  this.data = [];
+  this.lock = files[0];
+  fs.writeFile(this.lock, this.child.pid.toString() + '\n80\n24\n', "utf8"); 
+  this.record = fs.createWriteStream(files[1], { mode: 0664 });
+  /* END setup */
+  function ttyrec_chunk(buf) {
+    var ts = new Date();
+    var chunk = new Buffer(buf.length + 12);
+    /* TTYREC headers */
+    chunk.writeUInt32LE(Math.floor(ts.getTime() / 1000), 0);
+    chunk.writeUInt32LE(1000 * (ts.getTime() % 1000), 4);
+    chunk.writeUInt32LE(buf.length, 8);
+    buf.copy(chunk, 12);
+    ss.data.push(chunk);
+    ss.record.write(chunk);
+  }
+  this.child.stdout.on("data", ttyrec_chunk);
+  this.child.stderr.on("data", ttyrec_chunk);
+  this.child.on("exit", function (code, signal) {
+    ss.exitcode = (code != null ? code : 255);
+    ss.alive = false;
+    fs.unlink(ss.lock);
+    /* Wait for all the data to get collected */
+    setTimeout(ss.cleanup, 1000);
+  });
+  this.write = function (data) {
+    if (this.alive)
+      this.child.stdin.write(data);
+    /* Otherwise, throw some kind of exception? */
+  };
+  this.read = function () {
+    if (this.data.length == 0)
+      return null;
+    var pos = 0;
+    var i = 0;
+    for (i = 0; i < this.data.length; i++)
+      pos += this.data[i].length - 12;
+    var nbuf = new Buffer(pos);
+    var tptr;
+    pos = 0;
+    while (this.data.length > 0) {
+      tptr = this.data.shift();
+      tptr.copy(nbuf, pos, 12);
+      pos += tptr.length - 12;
+    }
+    return nbuf;
+  };
+  this.close = function () {
+    if (this.alive)
+      this.child.kill('SIGHUP');
+  };
+  this.cleanup = function () {
+    /* Call this when the child is dead. */
+    if (this.alive)
+      return;
+    ss.record.end();
+    /* Give the client a chance to read any leftover data. */
+    if (ss.data.length > 0)
+      setTimeout(ss.remove, 8000);
+    else
+      ss.remove();
+  };
+  this.remove = function () {
+    delete sessions[ss.sessid];
+    console.log("Session " + this.sessid + " removed.");
+  };
+}
+
+/* A few utility functions */
+function timestamp() {
+  dd = new Date();
+  sd = dd.toISOString();
+  sd = sd.slice(0, sd.indexOf("."));
+  return sd.replace("T", ".");
+}
+
+function randkey() {
+  rnum = Math.floor(Math.random() * 65536 * 65536);
+  hexstr = rnum.toString(16);
+  while (hexstr.length < 8)
+    hexstr = "0" + hexstr;
+  return hexstr;
+}
+
+/* Returns a list of the cookies in the request, obviously. */
+function getCookies(req) {
+  cookies = [];
+  if ("cookie" in req.headers) {
+    cookstrs = req.headers["cookie"].split("; ");
+    for (var i = 0; i < cookstrs.length; i++) {
+      eqsign = cookstrs[i].indexOf("=");
+      if (eqsign > 0) {
+        name = cookstrs[i].slice(0, eqsign).toLowerCase();
+        val = cookstrs[i].slice(eqsign + 1);
+        cookies[name] = val;
+      }
+      else if (eqsign < 0)
+        cookies[cookstrs[i]] = null;
+    }
+  }
+  return cookies;
+}
+
+function urlDec(encstr) {
+  var decstr = "";
+  var tnum;
+  for (var i = 0; i < encstr.length; i++)
+  {
+    if (encstr.charAt(i) == "+")
+      decstr += " ";
+    else if (encstr.charAt(i) == "%")
+    {
+      tnum = Number("0x" + encstr.slice(i + 1, 2));
+      if (!isNaN(tnum) && tnum >= 0)
+        decstr += String.fromCharCode(tnum);
+      i += 2;
+    }
+    else
+      decstr += encstr.charAt(i);
+  }
+  return decstr;
+}
+
+/* Returns the contents of a form */
+function getFormValues(formtext) {
+  var pairstrs = formtext.split("&");
+  var data = {};
+  for (var i = 0; i < pairstrs.length; i++)
+  {
+    var eqsign = pairstrs[i].indexOf("=");
+    if (eqsign > 0) {
+      rawname = pairstrs[i].slice(0, eqsign);
+      rawval = pairstrs[i].slice(eqsign + 1);
+      name = urlDec(rawname);
+      val = urlDec(rawval);
+      if (!(name in data))
+        data[name] = [];
+      data[name].push(val);
+    }
+  }
+  return data;
+}
+
+function auth(username, password) {
+  // Real authentication not implemented
+  return true;
+}
+
+function login(req, res, formdata) {
+  if (!("game" in formdata)) {
+    sendError(res, 2, "No game specified.");
+    return;
+  }
+  else if (!("name" in formdata)) {
+    sendError(res, 2, "Username not given.");
+    return;
+  }
+  else if (!("pw" in formdata)) {
+    sendError(res, 2, "Password not given.");
+    return;
+  }
+  var username = formdata["name"][0];
+  var password = formdata["pw"][0];
+  var gname = formdata["game"][0];
+  if (!(gname in games)) {
+    sendError(res, 2, "No such game: " + gname);
+    console.log("Request for nonexistant game \"" + gname + "\"");
+    return;
+  }
+  var progressdir = "/dgldir/inprogress-" + games[gname].uname;
+
+  // This sets up the game once starting is approved.
+  function startgame() {
+    var ts = timestamp();
+    var lockfile = path.join(progressdir, username + ":node:" + ts + ".ttyrec");
+    var ttyrec = path.join("/dgldir/ttyrec", username, gname, ts + ".ttyrec");
+    var nsession = new TermSession(gname, username, [lockfile, ttyrec]);
+    if (nsession) {
+      /* Technically there's a race condition for the "lock"file, but since 
+       * it requires the user deliberately starting two games at similar times, 
+       * it's not too serious. We can't get O_EXCL in Node anyway. */
+      res.writeHead(200, {'Content-Type': 'text/plain'});
+      res.write("l1\n" + nsession.sessid + "\n");
+      res.end();
+      console.log("%s playing %s (key %s, pid %d)", username, gname, 
+                  nsession.sessid, nsession.child.pid);
+    }
+    else {
+      sendError(res, 5, "Failed to open TTY");
+      console.log("Unable to allocate TTY for " + gname);
+    }
+  }
+  function checkit(code, signal) {
+    // check the password
+    if (code != 0) {
+      sendError(res, 3);
+      console.log("Password check failed for user " + username);