con.php

   1 <?php
   2 /**
   3  * con.php: Generic setup file.
   4  *
   5  * Contains user authentication, database connection and other exciting stuff.
   6  * Everything else depends on this file. Don't touch it unless you know what
   7  * you're doing, all the config is done in other places.
   8  *
   9  * @author Anthony Parsons (irc://specialops.ath.cx/whitefyre)
  10  * @license file:COPYING
  11  * @version $Id$
  12  */
  13
  14 /**
  15  * Source revision displayed in the page footer.
  16  * AFAIK there's no way to get the overall value both accurately and quickly,
  17  * so the revision for just this file will have to do.
  18  */
  19 define('SO2VER', '$Rev$');
  20
  21
  22 // Check for PHP version. SO2 won't run (sanely) on anything less than PHP 5.
  23 if ( version_compare(PHP_VERSION, '5.0', '<') ) {
  24         header('HTTP/1.1 500 Internal Server Error');
  25         die('Fatal Server Error: PHP 5.0 or higher is required.');
  26 }
  27
  28 // Use verbose errors. They won't be shown to the general public anyway.
  29 error_reporting(E_ALL|E_STRICT);
  30
  31
  32 /**
  33  * Start that timer at the bottom of each page.
  34  */
  35 define('CLOCK',  microtime(1));
  36
  37
  38 /* Empty exception classes.
  39    These allow for more specific catch{} blocks. */
  40 class InvalidInputException extends Exception {}
  41 class DatabaseException     extends Exception {}
  42 class RateLimitException    extends Exception {}
  43
  44
  45 /* SPL exception classes:
  46    These classes are defined in the Standard PHP Library in PHP 5.1 and above.
  47    If you only run the code on a 5.0 server, you can delete the if...{ and } lines.
  48    If you only run it on a 5.1 server, you can delete the lines inbetween too. */
  49 if ( version_compare(PHP_VERSION, '5.1', '<') ) {
  50         class OutOfBoundsException extends Exception {}
  51         class RuntimeException     extends Exception {}
  52         class LengthException      extends Exception {}
  53 }
  54
  55
  56 /**
  57  * Class autoloader
  58  */
  59 function __autoload($classname)
  60 {
  61         require 'lib/class.'.$classname.'.php';
  62 }
  63
  64
  65 // Debug settings
  66 if ( !isset($_SERVER['REMOTE_ADDR']) || $_SERVER['REMOTE_ADDR'] === $_SERVER['SERVER_ADDR'] )
  67         /**
  68          * If the "DEVELOPER" constant is defined a bunch of stuff works differently.
  69          */
  70         define('DEVELOPER', 1);
  71
  72
  73 // Create page object. The earlier this is done the better, because it contains the error handler stuff.
  74 $page = new page;
  75
  76
  77 /* Set up the exception handler bit.
  78    If dev mode is on you'll get a traceback when something fucks up.
  79    If not, you'll get a patronizing/"user-friendly" error message. */
  80 if ( defined('DEVELOPER') ) {
  81         /* Using the output buffer lets us switch off XHTML mode later if something buggers up.
  82            Fixing PHP errors is a lot less stressful when they're not hidden behind XML ones. */
  83         ob_start();
  84
  85         function e_handler($exception)
  86         {
  87                 header('HTTP/1.1 500 Internal Server Error');
  88                 header('Content-Type: text/html; charset=UTF-8');
  89                 echo '<pre class="error">',$exception->__toString(),'</pre>';
  90                 exit;
  91         }
  92 } else {
  93         function e_handler($exception)
  94         {
  95                 if ( !headers_sent() ) {
  96                         header('HTTP/1.1 500 Internal Server Error');
  97                         header('Content-Type: text/html; charset=UTF-8');
  98                 }
  99                 $page->errorfooter('runtime');
 100         }
 101 }
 102 set_exception_handler('e_handler');
 103
 104
 105 /* Database thingers.
 106    Refer to res/mysql_ident.example for how this file should look. */
 107 require 'mysql_ident.php';
 108
 109
 110 /* Open database connection here. This is where it gets more interesting.
 111    lib/class.debugmysqli.php has a bunch of debug stuff you might want to mess with. */
 112 if ( defined('DEVELOPER') ) {
 113         /* Turns on Really Fucking Verbose Mode™.
 114            This line is disabled because it persists across threads.
 115            Don't use it unless you're masochistic. */
 116         //mysqli_report(MYSQLI_REPORT_ALL);
 117
 118         $DB = new debugmysqli($DB['host'], $DB['user'], $DB['pass'], DATABASE_NAME);
 119 } else
 120         $DB = new mysqli($DB['host'], $DB['user'], $DB['pass'], DATABASE_NAME);
 121
 122 // Check for a DB connection error. Shit happens.
 123 if ( mysqli_connect_errno() ) {
 124         header('HTTP/1.1 500 Internal Server Error');
 125         die('Server error connecting to DB');
 126 }
 127
 128 // Check MySQL server version. See the comment about PHP versions at the top of the file.
 129 if ( version_compare($DB->server_info, '5.0', '<') ) {
 130         header('HTTP/1.1 500 Internal Server Error');
 131         die('Server error: MySQL 5.0 not found');
 132 }
 133
 134 /* Login cookie setting hack.
 135    This bit could be avoided by using $_SESSION everywhere I used $_COOKIE, but sessions are crap. */
 136 if ( isset($_POST['login'], $_POST['u'], $_POST['p']) )
 137         list($_COOKIE['u'], $_COOKIE['p']) = array($_POST['u'], $_POST['p']);
 138
 139
 140 // The rest of the file is stuff to decide whether you're logged in or not:
 141 if ( isset($_POST['logout']) ) {
 142         setcookie('u', null, 1);
 143         setcookie('p', null, 1);
 144         unset($_COOKIE);
 145         $user = new anonuser;
 146 } elseif ( isset($_COOKIE['u'], $_COOKIE['p']) ) {
 147         /* Try to get the user ID from the DB.
 148            Also tells the DB to remember your user ID, saves fucking around with PHP globals all the time. */
 149         $q = $DB->query('SELECT @userid := `userid` FROM `users`
 150                                          WHERE `alias` = \''.$DB->escape_string($_COOKIE['u']).'\'
 151                                          AND (`password` = AES_ENCRYPT(\''.$DB->escape_string($_COOKIE['p']).'\', `reg_ip`)
 152                                                   OR `password` IS NULL)');
 153
 154         // If there's a matching row in the DB then they're authenticated
 155         if ( 1 === $q->num_rows ) {
 156                 // Keep people logged in for 24 hours after their last page view
 157                 setcookie('u', $_COOKIE['u'], time()+86400);
 158                 setcookie('p', $_COOKIE['p'], time()+86400);
 159
 160                 $user = new authuser(isset($prefetch) ? $prefetch : null);
 161         } else {
 162                 /* This block of code gets executed if they fail a login attempt.
 163                    The relevant insults are in lib/class.page.php */
 164                 setcookie('u', null, 1);
 165                 setcookie('p', null, 1);
 166
 167                 $user = new anonuser;
 168         }
 169 } else
 170         $user = new anonuser;
 171 ?>