inc/base.php (4ce333d) - webinterface.git

base.php

<?php

require_once('inc/db_connect.php');

function config($key)
{
  global $config;
  if (array_key_exists($key, $config))
    return $config[$key];
  else
    logger(LOG_ERR, "inc/base", "config", "Request to read nonexistant config option »{$key}«.");
    return NULL;
}

function maybe_null($value)
{
  if ($value == NULL)
    return 'NULL';

if (strlen( (string) $value ) > 0)
    return "'".mysql_real_escape_string($value)."'";
  else
    return 'NULL';
}

#define('LOG_ERR', 3);
#define('LOG_WARNING', 4);
#define('LOG_INFO', 6);

function logger($severity, $scriptname, $scope, $message)
{
  if (config('logging') <= $severity)
    return;

$user = 'NULL';
  if ($_SESSION['role'] & ROLE_SYSTEMUSER)
    $user = "'{$_SESSION['userinfo']['username']}'";
  elseif ($_SESSION['role'] & ROLE_CUSTOMER)
    $user = "'{$_SESSION['customerinfo']['customerno']}'";
  
  $remote = mysql_real_escape_string($_SERVER['REMOTE_ADDR']);

$scriptname = mysql_real_escape_string($scriptname);
  $scope = mysql_real_escape_string($scope);
  $message = mysql_real_escape_string($message);

db_query("INSERT INTO misc.scriptlog (remote, user,scriptname,scope,message) VALUES ('{$remote}', {$user}, '{$scriptname}', '{$scope}', '{$message}');");
}

function html_header($arg)
{
  global $html_header;
  $html_header .= $arg;
}

function output($arg)
{
  global $output;
  $output .= $arg;
}

function random_string($nc, $a='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789') {
    $l=strlen($a)-1; $r='';
    while($nc-->0) $r.=$a{mt_rand(0,$l)};
    return $r;
 }

function user_is_sure()
{
  if (isset($_POST['really']))
  {
    if ($_POST['random_token'] == $_SESSION['are_you_sure_token'])
      return true;
    else
      system_failure("Possible Cross-site-request-forgery detected!");
  }
  elseif (isset($_POST['not_really']))
    return false;
  else
    return NULL;
}

function generate_form_token($form_id)
{
  require_once("inc/debug.php");
  $sessid = session_id();
  if ($sessid == "") 
  {
    DEBUG("Uh? Session not running? Wtf?");
    system_failure("Internal error!");
  }
  if (! isset($_SESSION['session_token']))
    $_SESSION['session_token'] = random_string(10);
  return hash('sha256', $sessid.$form_id.$_SESSION['session_token']);
}

function check_form_token($form_id, $formtoken = NULL)
{
  if ($formtoken == NULL)
    $formtoken = $_POST['formtoken'];
  $sessid = session_id();
  if ($sessid == "") 
  {
    DEBUG("Uh? Session not running? Wtf?");
    system_failure("Internal error! (Session not running)");
  }

$correct_formtoken = hash('sha256', $sessid.$form_id.$_SESSION['session_token']);

if (! ($formtoken == $correct_formtoken))
    system_failure("Possible cross-site-request-forgery!");
}

function have_module($modname)
{
  return in_array($modname, config('modules'));
}

function encode_querystring($querystring)
{
  global $debugmode;
  if ($debugmode)
    $querystring = 'debug&'.$querystring;
  DEBUG($querystring);
  $query = explode('&', $querystring);
  $new_query = array();
  foreach ($query AS $item)
    if ($item != '')
    {
      $split = explode('=', $item, 2);
      if (count($split) == 1)
        $new_query[] = $split[0];
      else
        $new_query[] = $split[0].'='.urlencode($split[1]);
    }
  $querystring = implode('&amp;', $new_query);
  if ($querystring)
    $querystring = '?'.$querystring;
  DEBUG($querystring);
  return $querystring;
}

function addnew($file, $label, $querystring = '')
{
  output('<p class="addnew">'.internal_link($file, $label, $querystring).'</p>');
}

function html_form($form_id, $scriptname, $querystring, $content)
{
  $querystring = encode_querystring($querystring);
  $ret = '';
  $ret .= '<form action="'.$scriptname.$querystring.'" method="post">'."\n";
  $ret .= '<p style="display: none;"><input type="hidden" name="formtoken" value="'.generate_form_token($form_id).'" /></p>'."\n";
  $ret .= $content;
  $ret .= '</form>';
  return $ret;  
}

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