ctdlphp/sessionproxy.php

   1 #!/usr/bin/php -q
   2
   3 <?php
   4 include "config_ctdlclient.php";
   5 // $Id$
   6 //
   7 // This is the session proxy that binds a unix domain socket to a Citadel
   8 // server connection.  We need one of these for each session because PHP does
   9 // not have a way to bind a session to a persistent socket.
  10 //
  11 // Web designers: don't touch this module.  It's not included in your web pages
  12 // and therefore you don't need to be here.
  13 //
  14 // Copyright (c) 2003 by Art Cancro <ajc@uncensored.citadel.org>
  15 // This program is released under the terms of the GNU General Public License.
  16
  17 global $msgsock;
  18
  19 // sock_gets() -- reads one line of text from a socket
  20 //
  21 if (CITADEL_DEBUG_PROXY)
  22 {
  23         define_syslog_variables();
  24         openlog("sessionproxylog", LOG_PID | LOG_PERROR, LOG_LOCAL0);
  25 }
  26 function sock_gets($sock) {
  27         global $msgsock;
  28         socket_clear_error($msgsock);
  29         $buf = socket_read($sock, 4096, PHP_NORMAL_READ);
  30         if (CITADEL_DEBUG_PROXY)
  31         {
  32                 syslog(LOG_DEBUG, "gets Read: ".$buf);
  33         }
  34         if (socket_last_error($sock)) return false;
  35
  36         if (preg_match("'\n$'s", $buf)) {
  37                 $buf = substr($buf, 0, strpos($buf, "\n"));
  38         }
  39
  40         return $buf;
  41 }
  42
  43
  44
  45
  46 // *** Start of main program ***
  47
  48 error_reporting(E_ALL);
  49
  50 /* Allow the script to hang around waiting for connections. */
  51 set_time_limit(0);
  52
  53 /* Turn on implicit output flushing so we see what we're getting
  54  * as it comes in.
  55  */
  56 ob_implicit_flush();
  57
  58 if ($argc != 2) {
  59         echo "usage: ", $argv[0], " sockname\n";
  60         exit(1);
  61 }
  62
  63 $sockname = $argv[1];
  64
  65 if ($sockname == "/tmp/") {
  66         echo "Invalid socket name.\n";
  67         exit(1);
  68 }
  69
  70 // If there's a dead socket already there, remove it.
  71 system("/bin/rm -f " . $sockname);
  72
  73 $sock = socket_create(AF_UNIX, SOCK_STREAM, 0);
  74 if (!$sock) {
  75         echo "socket_create() failed: ", socket_strerror($sock), "\n";
  76         system("/bin/rm -f " . $sockname);
  77         exit(2);
  78 }
  79
  80 $ret = socket_bind($sock, $sockname);
  81 if (!$ret) {
  82         echo "socket_bind() failed: ", socket_strerror($ret), "\n";
  83         system("/bin/rm -f " . $sockname);
  84         exit(3);
  85 }
  86
  87 $ret = socket_listen($sock, 5);
  88 if (!$ret) {
  89         echo "socket_listen() failed: ", socket_strerror($ret), "\n";
  90         system("/bin/rm -f " . $sockname);
  91         exit(4);
  92 }
  93
  94 // Set the permissions so someone else doesn't jump into our connection.
  95 chmod($sockname, 0600);
  96
  97 // We need to get a connection to the Citadel server going now.
  98
  99 $ctdlsock = fsockopen(CITADEL_HOSTNAME, CITADEL_TCP_PORTNO, $errno, $errstr, 30);
 100 if (!$ctdlsock) {
 101         socket_close ($sock);
 102         system("/bin/rm -f " . $sockname);
 103         exit(5);
 104 }
 105
 106 // Read the greeting from the Citadel server.
 107 if (!$buf = fgets($ctdlsock, 4096)) {
 108         socket_close ($sock);
 109         system("/bin/rm -f " . $sockname);
 110         exit(6);
 111 }
 112
 113 // Make sure the server is allowing logins.
 114 if (substr($buf, 0, 1) != "2") {
 115         socket_close ($sock);
 116         system("/bin/rm -f " . $sockname);
 117         exit(7);
 118 }
 119
 120 do {
 121         // Wait for connections, but time out after 15 minutes.
 122         // socket_select() is completely b0rken in PHP 4.1, which is why
 123         // this program requires PHP 4.3 or newer.
 124         //
 125         if (socket_select($readsock = array($sock),
 126                         $writesock = NULL,
 127                         $exceptsock = NULL,
 128                         900, 0
 129         ) == 0) {
 130                 // Timing out.
 131                 socket_close ($sock);
 132                 system("/bin/rm -f " . $sockname);
 133                 exit(8);
 134         }
 135
 136         // Ok, there's a valid connection coming in.  Accept it.
 137         $msgsock = socket_accept($sock);
 138         if ($msgsock >= 0) do {
 139                 $buf = sock_gets($msgsock);
 140                 if ($buf !== false) {
 141 //                      fwrite($logfd, ">>");
 142 //                      fwride($logfd, $buf);
 143                         if (!fwrite($ctdlsock, $buf . "\n")) {
 144                                 fclose($ctdlsock);
 145                                 socket_close($sock);
 146                                 system("/bin/rm -f " . $sockname);
 147                                 exit(9);
 148                         }
 149                         $talkback = fgets($ctdlsock, 4096);
 150                         if (CITADEL_DEBUG_PROXY)
 151                         {
 152                                 syslog(LOG_DEBUG, "talkback: ".$talkback);
 153                         }
 154                         if (!$talkback) {
 155                                 if (CITADEL_DEBUG_PROXY)
 156                                 {
 157                                         syslog(LOG_ERROR, "closing socket.");
 158                                 }
 159                                 fclose($ctdlsock);
 160                                 socket_close($sock);
 161                                 system("/bin/rm -f " . $sockname);
 162                                 exit(10);
 163                         }
 164                         socket_write($msgsock, $talkback, strlen($talkback));
 165
 166                         // BINARY_FOLLOWS mode
 167                         if (substr($talkback, 0, 1) == "6") {
 168                                 $bytes = intval(substr($talkback, 4));
 169                                 if (CITADEL_DEBUG_PROXY)
 170                                 {
 171                                         syslog(LOG_DEBUG, "reading ".$bytes." bytes from server");
 172                                 }
 173                                 $buf = fread($ctdlsock, $bytes);
 174                                 if (CITADEL_DEBUG_PROXY)
 175                                 {
 176                                         syslog(LOG_DEBUG, "Read: ".$buf);
 177                                 }
 178                                 socket_write($msgsock, $buf, $bytes);
 179                         }
 180
 181                         // LISTING_FOLLOWS mode
 182                         if (substr($talkback, 0, 1) == "1") do {
 183                                 $buf = fgets($ctdlsock, 4096);
 184                                 if (!$buf) {
 185                                         $buf = "000\n" ;
 186                                 }
 187                                 else {
 188                                         socket_write($msgsock, $buf,
 189                                                 strlen($buf));
 190                                 }
 191                         } while ($buf != "000\n");
 192
 193                         // SEND_LISTING mode
 194                         if (substr($talkback, 0, 1) == "4") do {
 195                                 socket_clear_error($msgsock);
 196                                 $buf = sock_gets($msgsock);
 197                                 if (socket_last_error($msgsock)) {
 198                                         $buf = "000" ;
 199                                 }
 200                                 if (!fwrite($ctdlsock, $buf . "\n")) {
 201                                         fclose($ctdlsock);
 202                                         socket_close($sock);
 203                                         system("/bin/rm -f " . $sockname);
 204                                         exit(11);
 205                                 }
 206                         } while ($buf != "000");
 207
 208                 }
 209         } while($buf !== false);
 210
 211         socket_close ($msgsock);
 212
 213 } while (true);
 214
 215 socket_close($sock);
 216 fclose($ctdlsock);
 217 system("/bin/rm -f " . $sockname);
 218 exit(0);
 219
 220 ?>