#!/usr/bin/php -q chat_serverhost; $_SERVER['PHP_SELF'] = "http://$CFG->chat_serverhost:$CFG->chat_serverport/mod/chat/chatd.php"; $safemode = ini_get('safe_mode'); if($phpversion < '4.3') { die("Error: The Moodle chat daemon requires at least PHP version 4.3 to run.\n Since your version is $phpversion, you have to upgrade.\n\n"); } if(!empty($safemode)) { die("Error: Cannot run with PHP safe_mode = On. Turn off safe_mode in php.ini.\n"); } $passref = ini_get('allow_call_time_pass_reference'); if(empty($passref)) { die("Error: Cannot run with PHP allow_call_time_pass_reference = Off. Turn on allow_call_time_pass_reference in php.ini.\n"); } @set_time_limit (0); set_magic_quotes_runtime(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 var $sid = NULL; var $type = NULL; //var $groupid = NULL; // PHP-level info var $handle = NULL; // TCP/IP var $ip = NULL; var $port = NULL; function ChatConnection($resource) { $this->handle = $resource; @socket_getpeername($this->handle, $this->ip, $this->port); } } class ChatDaemon { var $_resetsocket = false; var $_readytogo = false; var $_logfile = false; var $_trace_to_console = true; var $_trace_to_stdout = true; var $_logfile_name = 'chatd.log'; var $_last_idle_poll = 0; var $conn_ufo = array(); // Connections not identified yet var $conn_side = array(); // Sessions with sidekicks waiting for the main connection to be processed var $conn_half = array(); // Sessions that have valid connections but not all of them var $conn_sets = array(); // Sessions with complete connection sets sets var $sets_info = array(); // Keyed by sessionid exactly like conn_sets, one of these for each of those var $chatrooms = array(); // Keyed by chatid, holding arrays of data // IMPORTANT: $conn_sets, $sets_info and $chatrooms must remain synchronized! // Pay extra attention when you write code that affects any of them! function ChatDaemon() { $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.wav'; $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 $this->_trace_to_console = false; } } function error_handler ($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, $errno); } return true; } function poll_idle_chats($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($this->sets_info[$sessionid]['chatuser']->lastmessageping < $this->_last_idle_poll) { $this->trace('YES!'); // This user hasn't been polled since his last message if($this->write_data($this->conn_sets[$sessionid][CHAT_CONNECTION_CHANNEL], '') === false) { // User appears to have disconnected $this->disconnect_session($sessionid); } } } } } } $this->_last_idle_poll = $now; } function query_start() { return $this->_readytogo; } function trace($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); } } } function write_data($connection, $text) { $written = @socket_write($connection, $text, strlen($text)); if($written === false) { // $this->trace("socket_write() failed: reason: " . socket_strerror(socket_last_error($connection))); return false; } return true; // Enclosing the above code inside this blocks makes sure that // "a socket write operation will not block". I 'm not so sure // if this is needed, as we have a nonblocking socket anyway. // If trouble starts to creep up, we 'll restore this. // $check_socket = array($connection); // $socket_changed = socket_select($read = NULL, $check_socket, $except = NULL, 0, 0); // if($socket_changed > 0) { // // // ABOVE CODE GOES HERE // // } // return false; } function user_lazy_update($sessionid) { // TODO: this can and should be written as a single UPDATE query if(empty($this->sets_info[$sessionid])) { $this->trace('user_lazy_update() called for an invalid SID: '.$sessionid, E_USER_WARNING); 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; update_record('chat_users', $this->sets_info[$sessionid]['chatuser']); } return true; } function get_user_window($sessionid) { global $CFG; static $str; $info = &$this->sets_info[$sessionid]; course_setup($info['course'], $info['user']); $timenow = time(); if (empty($str)) { $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(); $refresh_inval = $CFG->chat_refresh_userlist * 1000; echo << 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; $popuppar = '\'/user/view.php?id='.$userinfo['user']->id.'&course='.$userinfo['courseid'].'\',\'user'.$userinfo['chatuser']->id.'\',\'\''; echo '"; } echo '
'; echo ''; print_user_picture($userinfo['user']->id, 0, $userinfo['user']->picture, false, false, false); echo ""; echo "

"; echo fullname($userinfo['user'])."
"; echo "$str->idle: ".format_time($lastping, $str)." "; echo ''.$str->beep."\n"; echo "

"; echo "
'; // About 2K of HTML comments to force browsers to render the HTML // echo $GLOBALS['CHAT_DUMMY_DATA']; echo "\n\n"; return ob_get_clean(); } function new_ufo_id() { static $id = 0; if($id++ === 0x1000000) { // Cycling very very slowly to prevent overflow $id = 0; } return $id; } function process_sidekicks($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; } function dispatch_sidekick($handle, $type, $sessionid, $customdata) { global $CFG; switch($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->system = 0; $msg->message = 'beep '.$customdata['beep']; $msg->timestamp = time(); // Commit to DB insert_record('chat_messages', $msg, false); // 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\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\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 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! // $this->trace('discarding message with stale index'); 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->system = 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; $msg->message = addslashes($msg->message); // Commit to DB insert_record('chat_messages', $msg, false); // 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\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($handle); } function promote_final($sessionid, $customdata) { if(isset($this->conn_sets[$sessionid])) { $this->trace('Set cannot be finalized: Session '.$sessionid.' is already active'); return false; } $chatuser = get_record('chat_users', 'sid', $sessionid); if($chatuser === false) { $this->dismiss_half($sessionid); return false; } $chat = get_record('chat', 'id', $chatuser->chatid); if($chat === false) { $this->dismiss_half($sessionid); return false; } $user = get_record('user', 'id', $chatuser->userid); if($user === false) { $this->dismiss_half($sessionid); return false; } $course = get_record('course', 'id', $chat->course); { if($course === false) { $this->dismiss_half($sessionid); return false; } } global $CHAT_HTMLHEAD_JS, $CFG; $this->conn_sets[$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, '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; } // $this->trace('QUIRKS value for this connection is '.$customdata['quirks']); $this->dismiss_half($sessionid, false); $this->write_data($this->conn_sets[$sessionid][CHAT_CONNECTION_CHANNEL], $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->system = 1; $msg->message = 'enter'; $msg->timestamp = time(); insert_record('chat_messages', $msg, false); $this->message_broadcast($msg, $this->sets_info[$sessionid]['user']); return true; } 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->trace('Dispatching sidekick immediately'); $this->dispatch_sidekick($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 an UFO anymore $this->dismiss_ufo($handle, false); // Dispatch waiting sidekicks $this->process_sidekicks($sessionid); return true; } } } return false; } 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[$sessionid]); return true; } function dismiss_set($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; } 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; } function conn_accept() { $read_socket = array($this->listen_socket); $changed = socket_select($read_socket, $write = NULL, $except = NULL, 0, 0); if(!$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] = $newconn; //$this->trace('UFO #'.$id.': connection from '.$newconn->ip.' on port '.$newconn->port.', '.$newconn->handle); } function conn_activity_ufo (&$handles) { $monitor = array(); if(!empty($this->conn_ufo)) { foreach($this->conn_ufo as $ufoid => $ufo) { $monitor[$ufoid] = $ufo->handle; } } if(empty($monitor)) { $handles = array(); return 0; } $retval = socket_select($monitor, $a = NULL, $b = NULL, NULL); $handles = $monitor; return $retval; } function message_broadcast($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 || $message->groupid == 0)) { // Simply give them the message course_setup($info['course'], $info['user']); $output = chat_format_message_manually($message, $info['courseid'], $sender, $info['user']); $this->trace('Delivering message "'.$output->text.'" to '.$this->conn_sets[$sessionid][CHAT_CONNECTION_CHANNEL]); if($output->beep) { $this->write_data($this->conn_sets[$sessionid][CHAT_CONNECTION_CHANNEL], ''); } if($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); } //$this->trace('Sent to UID '.$this->sets_info[$sessionid]['userid'].': '.$message->text_); } } } function disconnect_session($sessionid) { $info = $this->sets_info[$sessionid]; delete_records('chat_users', 'sid', $sessionid); $msg = &New stdClass; $msg->chatid = $info['chatid']; $msg->userid = $info['userid']; $msg->groupid = $info['groupid']; $msg->system = 1; $msg->message = 'exit'; $msg->timestamp = time(); $this->trace('User has disconnected, destroying uid '.$info['userid'].' with SID '.$sessionid, E_USER_WARNING); insert_record('chat_messages', $msg, false); // *************************** IMPORTANT // // Kill him BEFORE broadcasting, otherwise we 'll get infinite recursion! // // ********************************************************************** $latesender = $info['user']; $this->dismiss_set($sessionid); $this->message_broadcast($msg, $latesender); } function fatal($message) { $message .= "\n"; if($this->_logfile) { $this->trace($message, E_USER_ERROR); } echo "FATAL ERROR:: $message\n"; die(); } 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).' ['.$lasterr.']'); } //socket_close($DAEMON->listen_socket); //die(); 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); // [pj]: I really must have a good read on sockets. What exactly does this do? // http://www.unixguide.net/network/socketfaq/4.5.shtml is still not enlightening enough for me. socket_setopt($this->listen_socket, SOL_SOCKET, SO_REUSEADDR, 1); socket_set_nonblock($this->listen_socket); } 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" $switches = array_map(create_function('$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_setopt')) { echo "Error: Function socket_setopt() does not exist.\n"; echo "Possibly PHP has not been compiled with --enable-sockets.\n\n"; die(); } $DAEMON->init_sockets(); /* declare(ticks=1); $pid = pcntl_fork(); if ($pid == -1) { die("could not fork"); } else if ($pid) { exit(); // we are the parent } else { // we are the child } // detatch from the controlling terminal if (!posix_setsid()) { die("could not detach from terminal"); } // setup signal handlers pcntl_signal(SIGTERM, "sig_handler"); pcntl_signal(SIGHUP, "sig_handler"); if($DAEMON->_pcntl_exists && false) { $DAEMON->trace('Unholy spirit possession: daemonizing'); $DAEMON->pid = pcntl_fork(); if($pid == -1) { $DAEMON->trace('Process fork failed, terminating'); die(); } else if($pid) { // We are the parent $DAEMON->trace('Successfully forked the daemon with PID '.$pid); die(); } else { // We are the daemon! :P } // FROM NOW ON, IT'S THE DAEMON THAT'S RUNNING! // Detach from controlling terminal if(!posix_setsid()) { $DAEMON->trace('Could not detach daemon process from terminal!'); } } else { // Cannot go demonic $DAEMON->trace('Unholy spirit possession failed: PHP is not compiled with --enable-pcntl'); } */ $DAEMON->trace('Started Moodle chatd on port '.$CFG->chat_serverport.', listening socket '.$DAEMON->listen_socket, E_USER_WARNING); /// Clear the decks of old stuff delete_records('chat_users', 'version', 'sockets'); while(true) { $active = array(); // First of all, let's see if any of our UFOs has identified itself if($DAEMON->conn_activity_ufo($active)) { foreach($active as $handle) { $read_socket = array($handle); $changed = socket_select($read_socket, $write = NULL, $except = NULL, 0, 0); if($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) { // 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; } if(!ereg('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(!ereg('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; } else { $customdata = array('beep' => intval($info[1])); } break; case 'message': $type = CHAT_SIDEKICK_MESSAGE; if(!ereg('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; } 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; 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"); ?>