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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Chat daemon
*
* @package mod_chat
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
define('CLI_SCRIPT', true);
require(__DIR__.'/../../config.php');
require_once($CFG->dirroot . '/mod/chat/lib.php');
// Browser quirks.
define('QUIRK_CHUNK_UPDATE', 0x0001);
// Connection telltale.
define('CHAT_CONNECTION', 0x10);
// Connections: Incrementing sequence, 0x10 to 0x1f.
define('CHAT_CONNECTION_CHANNEL', 0x11);
// Sidekick telltale.
define('CHAT_SIDEKICK', 0x20);
// Sidekicks: Incrementing sequence, 0x21 to 0x2f.
define('CHAT_SIDEKICK_USERS', 0x21);
define('CHAT_SIDEKICK_MESSAGE', 0x22);
define('CHAT_SIDEKICK_BEEP', 0x23);
$phpversion = phpversion();
echo 'Moodle chat daemon v1.0 on PHP '.$phpversion."\n\n";
// Set up all the variables we need.
// The $CFG variables are now defined in database by chat/lib.php.
$_SERVER['PHP_SELF'] = 'dummy';
$_SERVER['SERVER_NAME'] = 'dummy';
$_SERVER['HTTP_USER_AGENT'] = 'dummy';
$_SERVER['SERVER_NAME'] = $CFG->chat_serverhost;
$_SERVER['PHP_SELF'] = "http://$CFG->chat_serverhost:$CFG->chat_serverport/mod/chat/chatd.php";
core_php_time_limit::raise(0);
error_reporting(E_ALL);
function chat_empty_connection() {
return array('sid' => null, 'handle' => null, 'ip' => null, 'port' => null, 'groupid' => null);
}
class ChatConnection {
// Chat-related info.
public $sid = null;
public $type = null;
// PHP-level info.
public $handle = null;
// TCP/IP.
public $ip = null;
public $port = null;
public function __construct($resource) {
$this->handle = $resource;
@socket_getpeername($this->handle, $this->ip, $this->port);
}
}
class ChatDaemon {
public $_resetsocket = false;
public $_readytogo = false;
public $_logfile = false;
public $_trace_to_console = true;
public $_trace_to_stdout = true;
public $_logfile_name = 'chatd.log';
public $_last_idle_poll = 0;
public $connectionsunidentified = array(); // Connections not identified yet.
public $connectionsside = array(); // Sessions with sidekicks waiting for the main connection to be processed.
public $connectionshalf = array(); // Sessions that have valid connections but not all of them.
public $connectionssets = array(); // Sessions with complete connection sets.
public $setsinfo = array(); // Keyed by sessionid exactly like conn_sets, one of these for each of those.
public $chatrooms = array(); // Keyed by chatid, holding arrays of data.
// IMPORTANT: $connectionssets, $setsinfo and $chatrooms must remain synchronized!
// Pay extra attention when you write code that affects any of them!
public function __construct() {
$this->_trace_level = E_ALL ^ E_USER_NOTICE;
$this->_pcntl_exists = function_exists('pcntl_fork');
$this->_time_rest_socket = 20;
$this->_beepsoundsrc = $GLOBALS['CFG']->wwwroot.'/mod/chat/beep.mp3';
$this->_freq_update_records = 20;
$this->_freq_poll_idle_chat = $GLOBALS['CFG']->chat_old_ping;
$this->_stdout = fopen('php://stdout', 'w');
if ($this->_stdout) {
// Avoid double traces for everything.
$this->_trace_to_console = false;
}
}
public function error_handler ($errno, $errmsg, $filename, $linenum, $vars) {
// Checks if an error needs to be suppressed due to @.
if (error_reporting() != 0) {
$this->trace($errmsg.' on line '.$linenum, $errno);
}
return true;
}
public function poll_idle_chats($now) {
$this->trace('Polling chats to detect disconnected users');
if (!empty($this->chatrooms)) {
foreach ($this->chatrooms as $chatid => $chatroom) {
if (!empty($chatroom['users'])) {
foreach ($chatroom['users'] as $sessionid => $userid) {
// We will be polling each user as required.
$this->trace('...shall we poll '.$sessionid.'?');
if (!empty($this->sets_info[$sessionid]) && isset($this->sets_info[$sessionid]['chatuser']) &&
// Having tried to exclude race conditions as already done in user_lazy_update()
// please do the real job by checking the last poll.
($this->sets_info[$sessionid]['chatuser']->lastmessageping < $this->_last_idle_poll)) {
$this->trace('YES!');
// This user hasn't been polled since his last message.
$result = $this->write_data($this->conn_sets[$sessionid][CHAT_CONNECTION_CHANNEL], '<!-- poll -->');
if ($result === false) {
// User appears to have disconnected.
$this->disconnect_session($sessionid);
}
}
}
}
}
}
$this->_last_idle_poll = $now;
}
public function query_start() {
return $this->_readytogo;
}
public function trace($message, $level = E_USER_NOTICE) {
$severity = '';
switch($level) {
case E_USER_WARNING:
$severity = '*IMPORTANT* ';
break;
case E_USER_ERROR:
$severity = ' *CRITICAL* ';
break;
case E_NOTICE:
case E_WARNING:
$severity = ' *CRITICAL* [php] ';
break;
}
$date = date('[Y-m-d H:i:s] ');
$message = $date.$severity.$message."\n";
if ($this->_trace_level & $level) {
// It is accepted for output.
// Error-class traces go to STDERR too.
if ($level & E_USER_ERROR) {
fwrite(STDERR, $message);
}
// Emit the message to wherever we should.
if ($this->_trace_to_stdout) {
fwrite($this->_stdout, $message);
fflush($this->_stdout);
}
if ($this->_trace_to_console) {
echo $message;
flush();
}
if ($this->_logfile) {
fwrite($this->_logfile, $message);
fflush($this->_logfile);
}
}
}
public function write_data($connection, $text) {
$written = @socket_write($connection, $text, strlen($text));
if ($written === false) {
return false;
}
return true;
}
public function user_lazy_update($sessionid) {
global $DB;
if (empty($this->sets_info[$sessionid])) {
$this->trace('user_lazy_update() called for an invalid SID: '.$sessionid, E_USER_WARNING);
return false;
}
// Does promote_final() already finish its job?
if (!isset($this->sets_info[$sessionid]['lastinfocommit'])) {
return false;
}
$now = time();
// We 'll be cheating a little, and NOT updating the record data as
// often as we can, so that we save on DB queries (imagine MANY users).
if ($now - $this->sets_info[$sessionid]['lastinfocommit'] > $this->_freq_update_records) {
// Commit to permanent storage.
$this->sets_info[$sessionid]['lastinfocommit'] = $now;
$DB->update_record('chat_users', $this->sets_info[$sessionid]['chatuser']);
}
return true;
}
public function get_user_window($sessionid) {
global $CFG, $OUTPUT;
static $str;
$info = &$this->sets_info[$sessionid];
$timenow = time();
if (empty($str)) {
$str = new stdClass();
$str->idle = get_string("idle", "chat");
$str->beep = get_string("beep", "chat");
$str->day = get_string("day");
$str->days = get_string("days");
$str->hour = get_string("hour");
$str->hours = get_string("hours");
$str->min = get_string("min");
$str->mins = get_string("mins");
$str->sec = get_string("sec");
$str->secs = get_string("secs");
$str->years = get_string('years');
}
ob_start();
$refreshinval = $CFG->chat_refresh_userlist * 1000;
echo <<<EOD
<html><head>
<meta http-equiv="refresh" content="$refreshinval">
<style type="text/css"> img{border:0} </style>
<script type="text/javascript">
//<![CDATA[
function openpopup(url,name,options,fullscreen) {
fullurl = "$CFG->wwwroot" + url;
windowobj = window.open(fullurl,name,options);
if (fullscreen) {
windowobj.moveTo(0,0);
windowobj.resizeTo(screen.availWidth,screen.availHeight);
}
windowobj.focus();
return false;
}
//]]>
</script></head><body><table><tbody>
EOD;
// Get the users from that chatroom.
$users = $this->chatrooms[$info['chatid']]['users'];
foreach ($users as $usersessionid => $userid) {
// Fetch each user's sessionid and then the rest of his data from $this->sets_info.
$userinfo = $this->sets_info[$usersessionid];
$lastping = $timenow - $userinfo['chatuser']->lastmessageping;
echo '<tr><td width="35">';
$link = '/user/view.php?id='.$userinfo['user']->id.'&course='.$userinfo['courseid'];
$anchortagcontents = $OUTPUT->user_picture($userinfo['user'], array('courseid' => $userinfo['courseid']));
$action = new popup_action('click', $link, 'user'.$userinfo['chatuser']->id);
$anchortag = $OUTPUT->action_link($link, $anchortagcontents, $action);
echo $anchortag;
echo "</td><td valign=\"center\">";
echo "<p><font size=\"1\">";
echo fullname($userinfo['user'])."<br />";
echo "<font color=\"#888888\">$str->idle: ".format_time($lastping, $str)."</font> ";
echo '<a target="empty" href="http://'.$CFG->chat_serverhost.':'.$CFG->chat_serverport.
'/?win=beep&beep='.$userinfo['user']->id.
'&chat_sid='.$sessionid.'">'.$str->beep."</a>\n";
echo "</font></p>";
echo "<td></tr>";
}
echo '</tbody></table>';
echo "</body>\n</html>\n";
return ob_get_clean();
}
public function new_ufo_id() {
static $id = 0;
if ($id++ === 0x1000000) { // Cycling very very slowly to prevent overflow.
$id = 0;
}
return $id;
}
public function process_sidekicks($sessionid) {
if (empty($this->conn_side[$sessionid])) {
return true;
}
foreach ($this->conn_side[$sessionid] as $sideid => $sidekick) {
// TODO: is this late-dispatch working correctly?
$this->dispatch_sidekick($sidekick['handle'], $sidekick['type'], $sessionid, $sidekick['customdata']);
unset($this->conn_side[$sessionid][$sideid]);
}
return true;
}
public function dispatch_sidekick($handle, $type, $sessionid, $customdata) {
global $CFG, $DB;
switch($type) {
case CHAT_SIDEKICK_BEEP:
// Incoming beep.
$msg = new stdClass;
$msg->chatid = $this->sets_info[$sessionid]['chatid'];
$msg->userid = $this->sets_info[$sessionid]['userid'];
$msg->groupid = $this->sets_info[$sessionid]['groupid'];
$msg->issystem = 0;
$msg->message = 'beep '.$customdata['beep'];
$msg->timestamp = time();
// Commit to DB.
chat_send_chatmessage($this->sets_info[$sessionid]['chatuser'], $msg->message, false,
$this->sets_info[$sessionid]['cm']);
// OK, now push it out to all users.
$this->message_broadcast($msg, $this->sets_info[$sessionid]['user']);
// Update that user's lastmessageping.
$this->sets_info[$sessionid]['chatuser']->lastping = $msg->timestamp;
$this->sets_info[$sessionid]['chatuser']->lastmessageping = $msg->timestamp;
$this->user_lazy_update($sessionid);
// We did our work, but before slamming the door on the poor browser
// show the courtesy of responding to the HTTP request. Otherwise, some
// browsers decide to get vengeance by flooding us with repeat requests.
$header = "HTTP/1.1 200 OK\n";
$header .= "Connection: close\n";
$header .= "Date: ".date('r')."\n";
$header .= "Server: Moodle\n";
$header .= "Content-Type: text/html; charset=utf-8\n";
$header .= "Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT\n";
$header .= "Cache-Control: no-cache, must-revalidate\n";
$header .= "Expires: Wed, 4 Oct 1978 09:32:45 GMT\n";
$header .= "\n";
// That's enough headers for one lousy dummy response.
$this->write_data($handle, $header);
// All done.
break;
case CHAT_SIDEKICK_USERS:
// A request to paint a user window.
$content = $this->get_user_window($sessionid);
$header = "HTTP/1.1 200 OK\n";
$header .= "Connection: close\n";
$header .= "Date: ".date('r')."\n";
$header .= "Server: Moodle\n";
$header .= "Content-Type: text/html; charset=utf-8\n";
$header .= "Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT\n";
$header .= "Cache-Control: no-cache, must-revalidate\n";
$header .= "Expires: Wed, 4 Oct 1978 09:32:45 GMT\n";
$header .= "Content-Length: ".strlen($content)."\n";
// The refresh value is 2 seconds higher than the configuration variable.
// This is because we are doing JS refreshes all the time.
// However, if the JS doesn't work for some reason, we still want to refresh once in a while.
$header .= "Refresh: ".(intval($CFG->chat_refresh_userlist) + 2).
"; url=http://$CFG->chat_serverhost:$CFG->chat_serverport/?win=users&".
"chat_sid=".$sessionid."\n";
$header .= "\n";
// That's enough headers for one lousy dummy response.
$this->trace('writing users http response to handle '.$handle);
$this->write_data($handle, $header . $content);
// Update that user's lastping.
$this->sets_info[$sessionid]['chatuser']->lastping = time();
$this->user_lazy_update($sessionid);
break;
case CHAT_SIDEKICK_MESSAGE:
// Incoming message.
// Browser stupidity protection from duplicate messages.
$messageindex = intval($customdata['index']);
if ($this->sets_info[$sessionid]['lastmessageindex'] >= $messageindex) {
// We have already broadcasted that!
break;
} else {
// Update our info.
$this->sets_info[$sessionid]['lastmessageindex'] = $messageindex;
}
$msg = new stdClass;
$msg->chatid = $this->sets_info[$sessionid]['chatid'];
$msg->userid = $this->sets_info[$sessionid]['userid'];
$msg->groupid = $this->sets_info[$sessionid]['groupid'];
$msg->issystem = 0;
$msg->message = urldecode($customdata['message']); // Have to undo the browser's encoding.
$msg->timestamp = time();
if (empty($msg->message)) {
// Someone just hit ENTER, send them on their way.
break;
}
// A slight hack to prevent malformed SQL inserts.
$origmsg = $msg->message;
$msg->message = $msg->message;
// Commit to DB.
chat_send_chatmessage($this->sets_info[$sessionid]['chatuser'], $msg->message, false,
$this->sets_info[$sessionid]['cm']);
// Undo the hack.
$msg->message = $origmsg;
// OK, now push it out to all users.
$this->message_broadcast($msg, $this->sets_info[$sessionid]['user']);
// Update that user's lastmessageping.
$this->sets_info[$sessionid]['chatuser']->lastping = $msg->timestamp;
$this->sets_info[$sessionid]['chatuser']->lastmessageping = $msg->timestamp;
$this->user_lazy_update($sessionid);
// We did our work, but before slamming the door on the poor browser
// show the courtesy of responding to the HTTP request. Otherwise, some
// browsers decide to get vengeance by flooding us with repeat requests.
$header = "HTTP/1.1 200 OK\n";
$header .= "Connection: close\n";
$header .= "Date: ".date('r')."\n";
$header .= "Server: Moodle\n";
$header .= "Content-Type: text/html; charset=utf-8\n";
$header .= "Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT\n";
$header .= "Cache-Control: no-cache, must-revalidate\n";
$header .= "Expires: Wed, 4 Oct 1978 09:32:45 GMT\n";
$header .= "\n";
// That's enough headers for one lousy dummy response.
$this->write_data($handle, $header);
// All done.
break;
}
socket_shutdown($handle);
socket_close($handle);
}
public function promote_final($sessionid, $customdata) {
global $DB;
if (isset($this->conn_sets[$sessionid])) {
$this->trace('Set cannot be finalized: Session '.$sessionid.' is already active');
return false;
}
$chatuser = $DB->get_record('chat_users', array('sid' => $sessionid));
if ($chatuser === false) {
$this->dismiss_half($sessionid);
return false;
}
$chat = $DB->get_record('chat', array('id' => $chatuser->chatid));
if ($chat === false) {
$this->dismiss_half($sessionid);
return false;
}
$user = $DB->get_record('user', array('id' => $chatuser->userid));
if ($user === false) {
$this->dismiss_half($sessionid);
return false;
}
$course = $DB->get_record('course', array('id' => $chat->course));
if ($course === false) {
$this->dismiss_half($sessionid);
return false;
}
if (!($cm = get_coursemodule_from_instance('chat', $chat->id, $course->id))) {
$this->dismiss_half($sessionid);
return false;
}
global $CHAT_HTMLHEAD_JS;
$this->conn_sets[$sessionid] = $this->conn_half[$sessionid];
// This whole thing needs to be purged of redundant info, and the
// code base to follow suit. But AFTER development is done.
$this->sets_info[$sessionid] = array(
'lastinfocommit' => 0,
'lastmessageindex' => 0,
'course' => $course,
'courseid' => $course->id,
'chatuser' => $chatuser,
'chatid' => $chat->id,
'cm' => $cm,
'user' => $user,
'userid' => $user->id,
'groupid' => $chatuser->groupid,
'lang' => $chatuser->lang,
'quirks' => $customdata['quirks']
);
// If we know nothing about this chatroom, initialize it and add the user.
if (!isset($this->chatrooms[$chat->id]['users'])) {
$this->chatrooms[$chat->id]['users'] = array($sessionid => $user->id);
} else {
// Otherwise just add the user.
$this->chatrooms[$chat->id]['users'][$sessionid] = $user->id;
}
$header = "HTTP/1.1 200 OK\n";
$header .= "Connection: close\n";
$header .= "Date: ".date('r')."\n";
$header .= "Server: Moodle\n";
$header .= "Content-Type: text/html; charset=utf-8\n";
$header .= "Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT\n";
$header .= "Cache-Control: no-cache, must-revalidate\n";
$header .= "Expires: Wed, 4 Oct 1978 09:32:45 GMT\n";
$header .= "\n";
$this->dismiss_half($sessionid, false);
$this->write_data($this->conn_sets[$sessionid][CHAT_CONNECTION_CHANNEL], $header . $CHAT_HTMLHEAD_JS);
$this->trace('Connection accepted: '
.$this->conn_sets[$sessionid][CHAT_CONNECTION_CHANNEL]
.', SID: '
.$sessionid
.' UID: '
.$chatuser->userid
.' GID: '
.$chatuser->groupid, E_USER_WARNING);
// Finally, broadcast the "entered the chat" message.
$msg = new stdClass;
$msg->chatid = $chatuser->chatid;
$msg->userid = $chatuser->userid;
$msg->groupid = $chatuser->groupid;
$msg->issystem = 1;
$msg->message = 'enter';
$msg->timestamp = time();
chat_send_chatmessage($chatuser, $msg->message, true);
$this->message_broadcast($msg, $this->sets_info[$sessionid]['user']);
return true;
}
public function promote_ufo($handle, $type, $sessionid, $customdata) {
if (empty($this->conn_ufo)) {
return false;
}
foreach ($this->conn_ufo as $id => $ufo) {
if ($ufo->handle == $handle) {
// OK, got the id of the UFO, but what is it?
if ($type & CHAT_SIDEKICK) {
// Is the main connection ready?
if (isset($this->conn_sets[$sessionid])) {
// Yes, so dispatch this sidekick now and be done with it.
$this->dispatch_sidekick($handle, $type, $sessionid, $customdata);
$this->dismiss_ufo($handle, false);
} else {
// No, so put it in the waiting list.
$this->trace('sidekick waiting');
$this->conn_side[$sessionid][] = array('type' => $type, 'handle' => $handle, 'customdata' => $customdata);
}
return true;
}
// If it's not a sidekick, at this point it can only be da man.
if ($type & CHAT_CONNECTION) {
// This forces a new connection right now.
$this->trace('Incoming connection from '.$ufo->ip.':'.$ufo->port);
// Do we have such a connection active?
if (isset($this->conn_sets[$sessionid])) {
// Yes, so regrettably we cannot promote you.
$this->trace('Connection rejected: session '.$sessionid.' is already final');
$this->dismiss_ufo($handle, true, 'Your SID was rejected.');
return false;
}
// Join this with what we may have already.
$this->conn_half[$sessionid][$type] = $handle;
// Do the bookkeeping.
$this->promote_final($sessionid, $customdata);
// It's not a UFO anymore.
$this->dismiss_ufo($handle, false);
// Dispatch waiting sidekicks.
$this->process_sidekicks($sessionid);
return true;
}
}
}
return false;
}
public function dismiss_half($sessionid, $disconnect = true) {
if (!isset($this->conn_half[$sessionid])) {
return false;
}
if ($disconnect) {
foreach ($this->conn_half[$sessionid] as $handle) {
@socket_shutdown($handle);
@socket_close($handle);
}
}
unset($this->conn_half[$sessionid]);
return true;
}
public function dismiss_set($sessionid) {
if (!empty($this->conn_sets[$sessionid])) {
foreach ($this->conn_sets[$sessionid] as $handle) {
// Since we want to dismiss this, don't generate any errors if it's dead already.
@socket_shutdown($handle);
@socket_close($handle);
}
}
$chatroom = $this->sets_info[$sessionid]['chatid'];
$userid = $this->sets_info[$sessionid]['userid'];
unset($this->conn_sets[$sessionid]);
unset($this->sets_info[$sessionid]);
unset($this->chatrooms[$chatroom]['users'][$sessionid]);
$this->trace('Removed all traces of user with session '.$sessionid, E_USER_NOTICE);
return true;
}
public function dismiss_ufo($handle, $disconnect = true, $message = null) {
if (empty($this->conn_ufo)) {
return false;
}
foreach ($this->conn_ufo as $id => $ufo) {
if ($ufo->handle == $handle) {
unset($this->conn_ufo[$id]);
if ($disconnect) {
if (!empty($message)) {
$this->write_data($handle, $message."\n\n");
}
socket_shutdown($handle);
socket_close($handle);
}
return true;
}
}
return false;
}
public function conn_accept() {
$readsocket = array($this->listen_socket);
$write = null;
$except = null;
$changed = socket_select($readsocket, $write, $except, 0, 0);
if (!$changed) {
return false;
}
$handle = socket_accept($this->listen_socket);
if (!$handle) {
return false;
}
$newconn = new ChatConnection($handle);
$id = $this->new_ufo_id();
$this->conn_ufo[$id] = $newconn;
}
public function conn_activity_ufo(&$handles) {
$monitor = array();
if (!empty($this->conn_ufo)) {
foreach ($this->conn_ufo as $ufoid => $ufo) {
// Avoid socket_select() warnings by preventing the check over invalid resources.
if (is_resource($ufo->handle)) {
$monitor[$ufoid] = $ufo->handle;
} else {
$this->dismiss_ufo($ufo->handle, false);
}
}
}
if (empty($monitor)) {
$handles = array();
return 0;
}
$a = null;
$b = null;
$retval = socket_select($monitor, $a, $b, null);
$handles = $monitor;
return $retval;
}
public function message_broadcast($message, $sender) {
if (empty($this->conn_sets)) {
return true;
}
$now = time();
// First of all, mark this chatroom as having had activity now.
$this->chatrooms[$message->chatid]['lastactivity'] = $now;
foreach ($this->sets_info as $sessionid => $info) {
// We need to get handles from users that are in the same chatroom, same group.
if ($info['chatid'] == $message->chatid &&
($info['groupid'] == $message->groupid || $message->groupid == 0)) {
// Simply give them the message.
$output = chat_format_message_manually($message, $info['courseid'], $sender, $info['user']);
if ($output !== false) {
$this->trace('Delivering message "'.$output->text.'" to ' .
$this->conn_sets[$sessionid][CHAT_CONNECTION_CHANNEL]);
if ($output->beep) {
$playscript = '(function() { var audioElement = document.createElement("audio");' . "\n";
$playscript .= 'audioElement.setAttribute("src", "'.$this->_beepsoundsrc.'");' . "\n";
$playscript .= 'audioElement.play(); })();' . "\n";
$this->write_data($this->conn_sets[$sessionid][CHAT_CONNECTION_CHANNEL],
'<script>' . $playscript . '</script>');
}
if ($info['quirks'] & QUIRK_CHUNK_UPDATE) {
$output->html .= $GLOBALS['CHAT_DUMMY_DATA'];
$output->html .= $GLOBALS['CHAT_DUMMY_DATA'];
$output->html .= $GLOBALS['CHAT_DUMMY_DATA'];
}
if (!$this->write_data($this->conn_sets[$sessionid][CHAT_CONNECTION_CHANNEL], $output->html)) {
$this->disconnect_session($sessionid);
}
}
}
}
}
public function disconnect_session($sessionid) {
global $DB;
$info = $this->sets_info[$sessionid];
$DB->delete_records('chat_users', array('sid' => $sessionid));
$msg = new stdClass;
$msg->chatid = $info['chatid'];
$msg->userid = $info['userid'];
$msg->groupid = $info['groupid'];
$msg->issystem = 1;
$msg->message = 'exit';
$msg->timestamp = time();
$this->trace('User has disconnected, destroying uid '.$info['userid'].' with SID '.$sessionid, E_USER_WARNING);
chat_send_chatmessage($info['chatuser'], $msg->message, true);
// IMPORTANT, kill him BEFORE broadcasting, otherwise we 'll get infinite recursion!
$latesender = $info['user'];
$this->dismiss_set($sessionid);
$this->message_broadcast($msg, $latesender);
}
public function fatal($message) {
$message .= "\n";
if ($this->_logfile) {
$this->trace($message, E_USER_ERROR);
}
echo "FATAL ERROR:: $message\n";
die();
}
public function init_sockets() {
global $CFG;
$this->trace('Setting up sockets');
if (false === ($this->listen_socket = socket_create(AF_INET, SOCK_STREAM, 0))) {
// Failed to create socket.
$lasterr = socket_last_error();
$this->fatal('socket_create() failed: '. socket_strerror($lasterr).' ['.$lasterr.']');
}
if (!socket_bind($this->listen_socket, $CFG->chat_serverip, $CFG->chat_serverport)) {
// Failed to bind socket.
$lasterr = socket_last_error();
$this->fatal('socket_bind() failed: '. socket_strerror($lasterr).' ['.$lasterr.']');
}
if (!socket_listen($this->listen_socket, $CFG->chat_servermax)) {
// Failed to get socket to listen.
$lasterr = socket_last_error();
$this->fatal('socket_listen() failed: '. socket_strerror($lasterr).' ['.$lasterr.']');
}
// Socket has been initialized and is ready.
$this->trace('Socket opened on port '.$CFG->chat_serverport);
// What exactly does this do? http://www.unixguide.net/network/socketfaq/4.5.shtml is still not enlightening enough for me.
socket_set_option($this->listen_socket, SOL_SOCKET, SO_REUSEADDR, 1);
socket_set_nonblock($this->listen_socket);
}
public function cli_switch($switch, $param = null) {
switch($switch) { // LOL!
case 'reset':
// Reset sockets.
$this->_resetsocket = true;
return false;
case 'start':
// Start the daemon.
$this->_readytogo = true;
return false;
break;
case 'v':
// Verbose mode.
$this->_trace_level = E_ALL;
return false;
break;
case 'l':
// Use logfile.
if (!empty($param)) {
$this->_logfile_name = $param;
}
$this->_logfile = @fopen($this->_logfile_name, 'a+');
if ($this->_logfile == false) {
$this->fatal('Failed to open '.$this->_logfile_name.' for writing');
}
return false;
default:
// Unrecognized.
$this->fatal('Unrecognized command line switch: '.$switch);
break;
}
return false;
}
}
$daemon = new ChatDaemon;
set_error_handler(array($daemon, 'error_handler'));
// Check the parameters.
unset($argv[0]);
$commandline = implode(' ', $argv);
if (strpos($commandline, '-') === false) {
if (!empty($commandline)) {
// We cannot have received any meaningful parameters.
$daemon->fatal('Garbage in command line');
}
} else {
// Parse command line.
$switches = preg_split('/(-{1,2}[a-zA-Z]+) */', $commandline, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
// Taking advantage of the fact that $switches is indexed with incrementing numeric keys.
// We will be using that to pass additional information to those switches who need it.
$numswitches = count($switches);
// Fancy way to give a "hyphen" boolean flag to each "switch".
$switches = array_map(function($x) {
return array("str" => $x, "hyphen" => (substr($x, 0, 1) == "-"));
}, $switches);
for ($i = 0; $i < $numswitches; ++$i) {
$switch = $switches[$i]['str'];
$params = ($i == $numswitches - 1 ? null :
($switches[$i + 1]['hyphen'] ? null : trim($switches[$i + 1]['str']))
);
if (substr($switch, 0, 2) == '--') {
// Double-hyphen switch.
$daemon->cli_switch(strtolower(substr($switch, 2)), $params);
} else if (substr($switch, 0, 1) == '-') {
// Single-hyphen switch(es), may be more than one run together.
$switch = substr($switch, 1); // Get rid of the "-".
$len = strlen($switch);
for ($j = 0; $j < $len; ++$j) {
$daemon->cli_switch(strtolower(substr($switch, $j, 1)), $params);
}
}
}
}
if (!$daemon->query_start()) {
// For some reason we didn't start, so print out some info.
echo 'Starts the Moodle chat socket server on port '.$CFG->chat_serverport;
echo "\n\n";
echo "Usage: chatd.php [parameters]\n\n";
echo "Parameters:\n";
echo " --start Starts the daemon\n";
echo " -v Verbose mode (prints trivial information messages)\n";
echo " -l [logfile] Log all messages to logfile (if not specified, chatd.log)\n";
echo "Example:\n";
echo " chatd.php --start -l\n\n";
die();
}
if (!function_exists('socket_set_option')) {
echo "Error: Function socket_set_option() does not exist.\n";
echo "Possibly PHP has not been compiled with --enable-sockets.\n\n";
die();
}
$daemon->init_sockets();
$daemon->trace('Started Moodle chatd on port '.$CFG->chat_serverport.', listening socket '.$daemon->listen_socket, E_USER_WARNING);
// Clear the decks of old stuff.
$DB->delete_records('chat_users', array('version' => 'sockets'));
while (true) {
$active = array();
// First of all, let's see if any of our UFOs have identified itself.
if ($daemon->conn_activity_ufo($active)) {
foreach ($active as $handle) {
$readsocket = array($handle);
$write = null;
$except = null;
$changed = socket_select($readsocket, $write, $except, 0, 0);
if ($changed > 0) {
// Let's see what it has to say.
$data = socket_read($handle, 2048); // Should be more than 512 to prevent empty pages and repeated messages!
if (empty($data)) {
continue;
}
if (strlen($data) == 2048) { // If socket_read has more data, ignore all data.
$daemon->trace('UFO with '.$handle.': Data too long; connection closed', E_USER_WARNING);
$daemon->dismiss_ufo($handle, true, 'Data too long; connection closed');
continue;
}
// Ignore desktop browser fake "favorite icon" requests.
if (strpos($data, 'GET /favicon.ico HTTP') === 0) {
// Known malformed data, drop it without any further notice.
continue;
}
if (!preg_match('/win=(chat|users|message|beep).*&chat_sid=([a-zA-Z0-9]*) HTTP/', $data, $info)) {
// Malformed data.
$daemon->trace('UFO with '.$handle.': Request with malformed data; connection closed', E_USER_WARNING);
$daemon->dismiss_ufo($handle, true, 'Request with malformed data; connection closed');
continue;
}
$type = $info[1];
$sessionid = $info[2];
$customdata = array();
switch($type) {
case 'chat':
$type = CHAT_CONNECTION_CHANNEL;
$customdata['quirks'] = 0;
if (strpos($data, 'Safari')) {
$daemon->trace('Safari identified...', E_USER_WARNING);
$customdata['quirks'] += QUIRK_CHUNK_UPDATE;
}
break;
case 'users':
$type = CHAT_SIDEKICK_USERS;
break;
case 'beep':
$type = CHAT_SIDEKICK_BEEP;
if (!preg_match('/beep=([^&]*)[& ]/', $data, $info)) {
$daemon->trace('Beep sidekick did not contain a valid userid', E_USER_WARNING);
$daemon->dismiss_ufo($handle, true, 'Request with malformed data; connection closed');
continue 2;
} else {
$customdata = array('beep' => intval($info[1]));
}
break;
case 'message':
$type = CHAT_SIDEKICK_MESSAGE;
if (!preg_match('/chat_message=([^&]*)[& ]chat_msgidnr=([^&]*)[& ]/', $data, $info)) {
$daemon->trace('Message sidekick did not contain a valid message', E_USER_WARNING);
$daemon->dismiss_ufo($handle, true, 'Request with malformed data; connection closed');
continue 2;
} else {
$customdata = array('message' => $info[1], 'index' => $info[2]);
}
break;
default:
$daemon->trace('UFO with '.$handle.': Request with unknown type; connection closed', E_USER_WARNING);
$daemon->dismiss_ufo($handle, true, 'Request with unknown type; connection closed');
continue 2;
break;
}
// OK, now we know it's something good. Promote it and pass it all the data it needs.
$daemon->promote_ufo($handle, $type, $sessionid, $customdata);
continue;
}
}
}
$now = time();
// Clean up chatrooms with no activity as required.
if ($now - $daemon->_last_idle_poll >= $daemon->_freq_poll_idle_chat) {
$daemon->poll_idle_chats($now);
}
// Finally, accept new connections.
$daemon->conn_accept();
usleep($daemon->_time_rest_socket);
}
@socket_shutdown($daemon->listen_socket, 0);
die("\n\n-- terminated --\n");