spam/spam.php

   1 <?php
   2 // $Id: spam.php,v 1.45 2006/11/26 08:55:15 henoheno Exp $
   3 // Copyright (C) 2006 PukiWiki Developers Team
   4 // License: GPL v2 or (at your option) any later version
   5
   6 // Functions for Concept-work of spam-uri metrics
   7
   8 // Return an array of URIs in the $string
   9 // [OK] http://nasty.example.org#nasty_string
  10 // [OK] http://nasty.example.org:80/foo/xxx#nasty_string/bar
  11 // [OK] ftp://nasty.example.org:80/dfsdfs
  12 // [OK] ftp://cnn.example.com&story=breaking_news@10.0.0.1/top_story.htm (from RFC3986)
  13 function uri_pickup($string = '', $normalize = TRUE,
  14         $preserve_rawuri = FALSE, $preserve_chunk = TRUE)
  15 {
  16         // Not available for: IDN(ignored)
  17         $array = array();
  18         preg_match_all(
  19                 // scheme://userinfo@host:port/path/or/pathinfo/maybefile.and?query=string#fragment
  20                 // Refer RFC3986 (Regex below is not strict)
  21                 '#(\b[a-z][a-z0-9.+-]{1,8})://' .       // 1: Scheme
  22                 '(?:' .
  23                         '([^\s<>"\'\[\]/\#?@]*)' .              // 2: Userinfo (Username)
  24                 '@)?' .
  25                 '(' .
  26                         // 3: Host
  27                         '\[[0-9a-f:.]+\]' . '|' .                               // IPv6([colon-hex and dot]): RFC2732
  28                         '(?:[0-9]{1-3}\.){3}[0-9]{1-3}' . '|' . // IPv4(dot-decimal): 001.22.3.44
  29                         '[^\s<>"\'\[\]:/\#?]+' .                                // FQDN: foo.example.org
  30                 ')' .
  31                 '(?::([0-9]*))?' .                                      // 4: Port
  32                 '((?:/+[^\s<>"\'\[\]/\#]+)*/+)?' .      // 5: Directory path or path-info
  33                 '([^\s<>"\'\[\]\#]+)?' .                        // 6: File and query string
  34                 '(?:\#([a-z0-9._~%!$&\'()*+,;=:@-]*))?' .       // 7: Fragment
  35                 '#i',
  36                  $string, $array, PREG_SET_ORDER | PREG_OFFSET_CAPTURE
  37         );
  38         //var_dump(recursive_map('htmlspecialchars', $array));
  39
  40         // Shrink $array
  41         static $parts = array(
  42                 1 => 'scheme', 2 => 'userinfo', 3 => 'host', 4 => 'port',
  43                 5 => 'path', 6 => 'file', 7 => 'fragment'
  44         );
  45         $default = array('');
  46         foreach(array_keys($array) as $uri) {
  47                 array_rename_keys($array[$uri], $parts, TRUE, $default);
  48                 $offset = $array[$uri]['scheme'][1]; // Scheme's offset
  49
  50                 foreach(array_keys($array[$uri]) as $part) {
  51                         // Remove offsets for each part
  52                         $array[$uri][$part] = & $array[$uri][$part][0];
  53                 }
  54
  55                 if ($normalize) {
  56                         $array[$uri]['scheme'] = scheme_normalize($array[$uri]['scheme']);
  57                         if ($array[$uri]['scheme'] === '') {
  58                                 unset ($array[$uri]);
  59                                 continue;
  60                         }
  61                         $array[$uri]['host'] = strtolower($array[$uri]['host']);
  62                         $array[$uri]['port'] = port_normalize($array[$uri]['port'], $array[$uri]['scheme'], FALSE);
  63                         $array[$uri]['path'] = path_normalize($array[$uri]['path']);
  64                         if ($preserve_rawuri) $array[$uri]['rawuri'] = & $array[$uri][0];
  65                 } else {
  66                         $array[$uri]['uri'] = & $array[$uri][0]; // Raw
  67                 }
  68                 unset($array[$uri][0]); // Matched string itself
  69                 if (! $preserve_chunk) {
  70                         unset(
  71                                 $array[$uri]['scheme'],
  72                                 $array[$uri]['userinfo'],
  73                                 $array[$uri]['host'],
  74                                 $array[$uri]['port'],
  75                                 $array[$uri]['path'],
  76                                 $array[$uri]['file'],
  77                                 $array[$uri]['fragment']
  78                         );
  79                 }
  80
  81                 $array[$uri]['area']['offset'] = $offset;
  82         }
  83
  84         return $array;
  85 }
  86
  87 // Domain exposure callback (See spam_uri_pickup_preprocess())
  88 // http://victim.example.org/?foo+site:nasty.example.com+bar
  89 // => http://nasty.example.com/?refer=victim.example.org
  90 // NOTE: 'refer=' is not so good for (at this time).
  91 // Consider about using IP address of the victim, try to avoid that.
  92 function _preg_replace_callback_domain_exposure($matches = array())
  93 {
  94         $result = '';
  95
  96         // Preserve the victim URI as a complicity or ...
  97         if (isset($matches[5])) {
  98                 $result =
  99                         $matches[1] . '://' .   // scheme
 100                         $matches[2] . '/' .             // victim.example.org
 101                         $matches[3];                    // The rest of all (before victim)
 102         }
 103
 104         // Flipped URI
 105         $result =
 106                 $matches[1] . '://' .   // scheme
 107                 $matches[4] .                   // nasty.example.com
 108                 '/?refer=' . strtolower($matches[2]) .  // victim.example.org
 109                 ' ' . $result;
 110
 111         return $result;
 112 }
 113
 114 // Preprocess: rawurldecode() and adding space(s) and something
 115 // to detect/count some URIs _if possible_
 116 // NOTE: It's maybe danger to var_dump(result). [e.g. 'javascript:']
 117 // [OK] http://victim.example.org/go?http%3A%2F%2Fnasty.example.org
 118 // [OK] http://victim.example.org/http://nasty.example.org
 119 function spam_uri_pickup_preprocess($string = '')
 120 {
 121         if (! is_string($string)) return '';
 122
 123         $string = rawurldecode($string);
 124
 125         // Domain exposure (See _preg_replace_callback_domain_exposure())
 126         $string = preg_replace_callback(
 127                 array(
 128                         // Something Google: http://www.google.com/supported_domains
 129                         '#(http)://([a-z0-9.]+\.google\.[a-z]{2,3}(?:\.[a-z]{2})?)/' .
 130                         '([a-z0-9?=&.%_+-]+)' .         // ?query=foo+
 131                         '\bsite:([a-z0-9.%_-]+)' .      // site:nasty.example.com
 132                         '()' .  // Preserve?
 133                         '#i',
 134                 ),
 135                 '_preg_replace_callback_domain_exposure',
 136                 $string
 137         );
 138
 139         // URI exposure (uriuri => uri uri)
 140         $string = preg_replace(
 141                 array(
 142                         '#(?<! )(?:https?|ftp):/#i',
 143                 //      '#[a-z][a-z0-9.+-]{1,8}://#i',
 144                 //      '#[a-z][a-z0-9.+-]{1,8}://#i'
 145                 ),
 146                 ' $0',
 147                 $string
 148         );
 149
 150         return $string;
 151 }
 152
 153 // Main function of spam-uri pickup
 154 function spam_uri_pickup($string = '', $area = array())
 155 {
 156         if (! is_array($area) || empty($area)) {
 157                 $area = array(
 158                                 'anchor' => TRUE,
 159                                 'bbcode' => TRUE,
 160                         );
 161         }
 162
 163         $string = spam_uri_pickup_preprocess($string);
 164
 165         $array  = uri_pickup($string);
 166
 167         // Area elevation for '(especially external)link' intension
 168         if (! empty($array)) {
 169
 170                 $area_shadow = array();
 171                 foreach(array_keys($array) as $key){
 172                         $area_shadow[$key] = & $array[$key]['area'];
 173                         $area_shadow[$key]['anchor'] = 0;
 174                         $area_shadow[$key]['bbcode'] = 0;
 175                 }
 176
 177                 // Anchor tags by preg_match_all()
 178                 // [OK] <a href="http://nasty.example.com">visit http://nasty.example.com/</a>
 179                 // [OK] <a href=\'http://nasty.example.com/\' >discount foobar</a>
 180                 // [NG] <a href="http://ng.example.com">visit http://ng.example.com _not_ended_
 181                 // [NG] <a href=  >Good site!</a> <a href= "#" >test</a>
 182                 if (isset($area['anchor'])) {
 183                         $areas = array();
 184                         preg_match_all('#<a\b[^>]*href[^>]*>.*?</a\b[^>]*(>)#i',
 185                                  $string, $areas, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
 186                         //var_dump(recursive_map('htmlspecialchars', $areas));
 187                         foreach(array_keys($areas) as $_area) {
 188                                 $areas[$_area] =  array(
 189                                         $areas[$_area][0][1], // Area start (<a href>)
 190                                         $areas[$_area][1][1], // Area end   (</a>)
 191                                 );
 192                         }
 193                         area_measure($areas, $area_shadow, 1, 'anchor');
 194                 }
 195
 196                 // phpBB's "BBCode" by preg_match_all()
 197                 // [url]http://nasty.example.com/[/url]
 198                 // [link]http://nasty.example.com/[/link]
 199                 // [url=http://nasty.example.com]visit http://nasty.example.com/[/url]
 200                 // [link http://nasty.example.com/]buy something[/link]
 201                 // ?? [url=][/url]
 202                 if (isset($area['bbcode'])) {
 203                         $areas = array();
 204                         preg_match_all('#\[(url|link)\b[^\]]*\].*?\[/\1\b[^\]]*(\])#i',
 205                                  $string, $areas, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
 206                         //var_dump(recursive_map('htmlspecialchars', $areas));
 207                         foreach(array_keys($areas) as $_area) {
 208                                 $areas[$_area] = array(
 209                                         $areas[$_area][0][1], // Area start ([url])
 210                                         $areas[$_area][2][1], // Area end   ([/url])
 211                                 );
 212                         }
 213                         area_measure($areas, $area_shadow, 1, 'bbcode');
 214                 }
 215
 216                 // Various Wiki syntax
 217                 // [text_or_uri>text_or_uri]
 218                 // [text_or_uri:text_or_uri]
 219                 // [text_or_uri|text_or_uri]
 220                 // [text_or_uri->text_or_uri]
 221                 // [text_or_uri text_or_uri] // MediaWiki
 222                 // MediaWiki: [http://nasty.example.com/ visit http://nasty.example.com/]
 223
 224                 // Remove 'offset's for area_measure()
 225                 foreach(array_keys($array) as $key)
 226                         unset($array[$key]['area']['offset']);
 227         }
 228
 229         return $array;
 230 }
 231
 232 // $array['something'] => $array['wanted']
 233 function array_rename_keys(& $array, $keys = array('from' => 'to'), $force = FALSE, $default = '')
 234 {
 235         if (! is_array($array) || ! is_array($keys)) return FALSE;
 236
 237         // Nondestructive test
 238         if (! $force)
 239                 foreach(array_keys($keys) as $from)
 240                         if (! isset($array[$from]))
 241                                 return FALSE;
 242
 243         foreach($keys as $from => $to) {
 244                 if ($from === $to) continue;
 245                 if (! $force || isset($array[$from])) {
 246                         $array[$to] = & $array[$from];
 247                         unset($array[$from]);
 248                 } else  {
 249                         $array[$to] = $default;
 250                 }
 251         }
 252
 253         return TRUE;
 254 }
 255
 256 // If in doubt, it's a little doubtful
 257 function area_measure($areas, & $array, $belief = -1, $a_key = 'area', $o_key = 'offset')
 258 {
 259         if (! is_array($areas) || ! is_array($array)) return;
 260
 261         $areas_keys = array_keys($areas);
 262         foreach(array_keys($array) as $u_index) {
 263                 $offset = isset($array[$u_index][$o_key]) ?
 264                         intval($array[$u_index][$o_key]) : 0;
 265                 foreach($areas_keys as $a_index) {
 266                         if (isset($array[$u_index][$a_key])) {
 267                                 $offset_s = intval($areas[$a_index][0]);
 268                                 $offset_e = intval($areas[$a_index][1]);
 269                                 // [Area => inside <= Area]
 270                                 if ($offset_s < $offset && $offset < $offset_e) {
 271                                         $array[$u_index][$a_key] += $belief;
 272                                 }
 273                         }
 274                 }
 275         }
 276 }
 277
 278
 279 // ---------------------
 280 // Part Two
 281
 282 // Scheme normalization: Renaming the schemes
 283 // snntp://example.org =>  nntps://example.org
 284 // NOTE: Keep the static lists simple. See also port_normalize().
 285 function scheme_normalize($scheme = '', $considerd_harmfull = TRUE)
 286 {
 287         // Abbreviations considerable they don't have link intension
 288         static $abbrevs = array(
 289                 'ttp'   => 'http',
 290                 'ttps'  => 'https',
 291         );
 292
 293         // Alias => normalized
 294         static $aliases = array(
 295                 'pop'   => 'pop3',
 296                 'news'  => 'nntp',
 297                 'imap4' => 'imap',
 298                 'snntp' => 'nntps',
 299                 'snews' => 'nntps',
 300                 'spop3' => 'pop3s',
 301                 'pops'  => 'pop3s',
 302         );
 303
 304         $scheme = strtolower(trim($scheme));
 305         if (isset($abbrevs[$scheme])) {
 306                 if ($considerd_harmfull) {
 307                         $scheme = $abbrevs[$scheme];
 308                 } else {
 309                         $scheme = '';
 310                 }
 311         }
 312         if (isset($aliases[$scheme])) $scheme = $aliases[$scheme];
 313
 314         return $scheme;
 315 }
 316
 317 // Port normalization: Suppress the (redundant) default port
 318 // HTTP://example.org:80/ => http://example.org/
 319 // HTTP://example.org:8080/ => http://example.org:8080/
 320 // HTTPS://example.org:443/ => https://example.org/
 321 function port_normalize($port, $scheme, $scheme_normalize = TRUE)
 322 {
 323         // Schemes that users _maybe_ want to add protocol-handlers
 324         // to their web browsers. (and attackers _maybe_ want to use ...)
 325         // Reference: http://www.iana.org/assignments/port-numbers
 326         static $array = array(
 327                 // scheme => default port
 328                 'ftp'     =>    21,
 329                 'ssh'     =>    22,
 330                 'telnet'  =>    23,
 331                 'smtp'    =>    25,
 332                 'tftp'    =>    69,
 333                 'gopher'  =>    70,
 334                 'finger'  =>    79,
 335                 'http'    =>    80,
 336                 'pop3'    =>   110,
 337                 'sftp'    =>   115,
 338                 'nntp'    =>   119,
 339                 'imap'    =>   143,
 340                 'irc'     =>   194,
 341                 'wais'    =>   210,
 342                 'https'   =>   443,
 343                 'nntps'   =>   563,
 344                 'rsync'   =>   873,
 345                 'ftps'    =>   990,
 346                 'telnets' =>   992,
 347                 'imaps'   =>   993,
 348                 'ircs'    =>   994,
 349                 'pop3s'   =>   995,
 350                 'mysql'   =>  3306,
 351         );
 352
 353         $port = trim($port);
 354         if ($port === '') return $port;
 355
 356         if ($scheme_normalize) $scheme = scheme_normalize($scheme);
 357         if (isset($array[$scheme]) && $port == $array[$scheme])
 358                 $port = ''; // Ignore the defaults
 359
 360         return $port;
 361 }
 362
 363 // Path normalization
 364 // http://example.org => http://example.org/
 365 // http://example.org#hoge => http://example.org/#hoge
 366 // http://example.org/path/a/b/./c////./d => http://example.org/path/a/b/c/d
 367 // http://example.org/path/../../a/../back => http://example.org/back
 368 function path_normalize($path = '', $divider = '/', $addroot = TRUE)
 369 {
 370         if (! is_string($path) || $path == '') {
 371                 $path = $addroot ? $divider : '';
 372         } else {
 373                 $path = trim($path);
 374                 $last = ($path[strlen($path) - 1] == $divider) ? $divider : '';
 375                 $array = explode($divider, $path);
 376
 377                 // Remove paddings
 378                 foreach(array_keys($array) as $key) {
 379                         if ($array[$key] == '' || $array[$key] == '.')
 380                                  unset($array[$key]);
 381                 }
 382                 // Back-track
 383                 $tmp = array();
 384                 foreach($array as $value) {
 385                         if ($value == '..') {
 386                                 array_pop($tmp);
 387                         } else {
 388                                 array_push($tmp, $value);
 389                         }
 390                 }
 391                 $array = & $tmp;
 392
 393                 $path = $addroot ? $divider : '';
 394                 if (! empty($array)) $path .= implode($divider, $array) . $last;
 395         }
 396
 397         return $path;
 398 }
 399
 400 // An URI array => An URI (See uri_pickup())
 401 function uri_array_implode($uri = array())
 402 {
 403         if (empty($uri) || ! is_array($uri)) return NULL;
 404
 405         $tmp = array();
 406         if (isset($uri['scheme']) && $uri['scheme'] !== '') {
 407                 $tmp[] = & $uri['scheme'];
 408                 $tmp[] = '://';
 409         }
 410         if (isset($uri['userinfo']) && $uri['userinfo'] !== '') {
 411                 $tmp[] = & $uri['userinfo'];
 412                 $tmp[] = '@';
 413         }
 414         if (isset($uri['host']) && $uri['host'] !== '') {
 415                 $tmp[] = & $uri['host'];
 416         }
 417         if (isset($uri['port']) && $uri['port'] !== '') {
 418                 $tmp[] = ':';
 419                 $tmp[] = & $uri['port'];
 420         }
 421         if (isset($uri['path']) && $uri['path'] !== '') {
 422                 $tmp[] = & $uri['path'];
 423         }
 424         if (isset($uri['file']) && $uri['file'] !== '') {
 425                 $tmp[] = & $uri['file'];
 426         }
 427         if (isset($uri['fragment']) && $uri['fragment'] !== '') {
 428                 $tmp[] = '#';
 429                 $tmp[] = & $uri['fragment'];
 430         }
 431
 432         return implode('', $tmp);
 433 }
 434
 435 // ---------------------
 436 // Part One : Checker
 437
 438 function generate_glob_regex($string = '', $divider = '/')
 439 {
 440         static $from = array(
 441                         0 => '*',
 442                         1 => '?',
 443                         2 => '\[',
 444                         3 => '\]',
 445                         4 => '[',
 446                         5 => ']',
 447                 );
 448         static $mid = array(
 449                         0 => '_AST_',
 450                         1 => '_QUE_',
 451                         2 => '_eRBR_',
 452                         3 => '_eLBR_',
 453                         4 => '_RBR_',
 454                         5 => '_LBR_',
 455                 );
 456         static $to = array(
 457                         0 => '.*',
 458                         1 => '.',
 459                         2 => '\[',
 460                         3 => '\]',
 461                         4 => '[',
 462                         5 => ']',
 463                 );
 464
 465         $string = str_replace($from, $mid, $string); // Hide
 466         $string = preg_quote($string, $divider);
 467         $string = str_replace($mid, $to, $string);   // Unhide
 468
 469         return $string;
 470 }
 471
 472 // TODO: Ignore list
 473 // TODO: require_or_include_once(another file) for Admin
 474 function is_badhost($hosts = '', $asap = TRUE)
 475 {
 476         static $blocklist_regex;
 477
 478         if (! isset($blocklist_regex)) {
 479                 $blocklist_regex = array();
 480                 $blocklist = array(
 481                         // Deny all uri
 482                         //'*',
 483
 484                         // IP address or ...
 485                         //'10.20.*.*',  // 10.20.example.com also matches
 486                         //'\[1\]',
 487
 488                         // Too much malicious sub-domains
 489                         //'*.blogspot.com',
 490
 491                         // 2006-11 dev
 492                         'wwwtahoo.com',
 493
 494                         // 2006-11 dev
 495                         '*.infogami.com',
 496
 497                         // 2006/11/19 17:50 dev
 498                         //'*.google0site.org',
 499                         //'*.bigpricesearch.org',
 500                         //'*.osfind.org',
 501                         //'*.bablomira.biz',
 502                 );
 503                 foreach ($blocklist as $part) {
 504                         $blocklist_regex[] = '#^' . generate_glob_regex($part, '#') . '$#i';
 505                 }
 506         }
 507
 508         $result = 0;
 509         if (! is_array($hosts)) $hosts = array($hosts);
 510         foreach($hosts as $host) {
 511                 if (! is_string($host)) $host = '';
 512                 foreach ($blocklist_regex as $regex) {
 513                         if (preg_match($regex, $host)) {
 514                                 ++$result;
 515                                 if ($asap) {
 516                                         return $result;
 517                                 } else {
 518                                         break;
 519                                 }
 520                         }
 521                 }
 522         }
 523
 524         return $result;
 525 }
 526
 527 // Default (enabled) methods and thresholds
 528 function check_uri_spam_method()
 529 {
 530         return array(
 531                 'quantity'   => 8,      // Allow N URIs
 532                 'area' => array(
 533                 //      'total'  => 0,  // Allow N areas total, enabled below
 534                         'anchor' => 0,  // Inside <a href> HTML tag
 535                         'bbcode' => 0,  // Inside [url] or [link] BBCode
 536                         ),
 537                 'non_uniq'   => 3,              // Allow N duped (and normalized) URIs
 538                 'badhost'    => TRUE,   // Check badhost
 539                 );
 540 }
 541
 542 // TODO return TRUE or FALSE!
 543 // Simple/fast spam check
 544 function check_uri_spam($target = '', $method = array(), $asap = TRUE)
 545 {
 546         $is_spam  = FALSE;
 547         $progress = array(
 548                 'quantity'   => 0,
 549                 'area' => array(
 550                         'total'  => 0,
 551                         'anchor' => 0,
 552                         'bbcode' => 0,
 553                         ),
 554                 'non_uniq'   => 0,
 555                 'uniqhost'   => 0,
 556                 'badhost'    => 0,
 557                 '_action'    => array(),
 558                 );
 559
 560         if (! is_array($method) || empty($method)) {
 561                 $method = check_uri_spam_method();
 562         }
 563
 564         if (is_array($target)) {
 565                 foreach($target as $str) {
 566                         // Recurse
 567                         list($is_spam, $_progress) = check_uri_spam($str, $method);
 568                         $progress['quantity']       += $_progress['quantity'];
 569                         $progress['area']['total']  += $_progress['area']['total'];
 570                         $progress['area']['anchor'] += $_progress['area']['anchor'];
 571                         $progress['area']['bbcode'] += $_progress['area']['bbcode'];
 572                         $progress['non_uniq']       += $_progress['non_uniq'];
 573                         $progress['uniqhost']       += $_progress['uniqhost'];
 574                         $progress['badhost']        += $_progress['badhost'];
 575                         if ($asap || $is_spam) break;
 576                 }
 577         } else {
 578                 $pickups = spam_uri_pickup($target);
 579                 if (! empty($pickups)) {
 580                         $progress['quantity'] += count($pickups);
 581
 582                         // URI quantity
 583                         if ((! $is_spam || ! $asap) && isset($method['quantity']) &&
 584                                 $progress['quantity'] > $method['quantity']) {
 585                                 $is_spam = TRUE;
 586                                 $progress['_action']['quantity'] = TRUE;
 587                         }
 588                         //var_dump($method['quantity'], $is_spam);
 589
 590                         // Using invalid area
 591                         if ((! $is_spam || ! $asap) && isset($method['area'])) {
 592                                 foreach($pickups as $pickup) {
 593                                         foreach ($pickup['area'] as $key => $value) {
 594                                                 if ($key == 'offset') continue;
 595                                                 $progress['area']['total'] += $value;
 596                                                 $progress['area'][$key]    += $value;
 597                                                 if (isset($method['area']['total']) &&
 598                                                                 $progress['area']['total'] > $method['area']['total']) {
 599                                                         $is_spam = TRUE;
 600                                                         $progress['_action']['area']['total'] = TRUE;
 601                                                         if ($is_spam && $asap) break;
 602                                                 }
 603                                                 if(isset($method['area'][$key]) &&
 604                                                                 $progress['area'][$key] > $method['area'][$key]) {
 605                                                         $is_spam = TRUE;
 606                                                         $progress['_action']['area'][$key] = TRUE;
 607                                                         if ($is_spam && $asap) break;
 608                                                 }
 609                                         }
 610                                         if ($is_spam && $asap) break;
 611                                 }
 612                         }
 613                         //var_dump($method['area'], $is_spam);
 614
 615                         // URI uniqueness (and removing non-uniques)
 616                         if ((! $is_spam || ! $asap) && isset($method['non_uniq'])) {
 617                                 $uris = array();
 618                                 foreach ($pickups as $key => $pickup) {
 619                                         $uris[$key] = uri_array_implode($pickup);
 620                                 }
 621                                 $count = count($uris);
 622                                 $uris = array_unique($uris);
 623                                 $progress['non_uniq'] += $count - count($uris);
 624                                 if ($progress['non_uniq'] > $method['non_uniq']) {
 625                                         $is_spam = TRUE;
 626                                         $progress['_action']['non_uniq'] = TRUE;
 627                                 }
 628                                 if (! $asap || ! $is_spam) {
 629                                         foreach (array_diff(array_keys($pickups),
 630                                                 array_keys($uris)) as $remove) {
 631                                                 unset($pickups[$remove]);
 632                                         }
 633                                 }
 634                                 unset($uris);
 635                         }
 636                         //var_dump($method['non_uniq'], $is_spam);
 637
 638                         // Unique host
 639                         $hosts = array();
 640                         foreach ($pickups as $pickup) {
 641                                 $hosts[] = & $pickup['host'];
 642                         }
 643                         $hosts = array_unique($hosts);
 644                         $progress['uniqhost'] += count($hosts);
 645                         //var_dump($method['uniqhost'], $is_spam);
 646
 647                         // Bad host
 648                         if ((! $is_spam || ! $asap) && isset($method['badhost'])) {
 649                                 $count = is_badhost($hosts, $asap);
 650                                 $progress['badhost'] += $count;
 651                                 if ($count !== 0) {
 652                                         $progress['_action']['badhost'] = TRUE;
 653                                         $is_spam = TRUE;
 654                                 }
 655                         }
 656                         //var_dump($method['badhost'], $is_spam);
 657                 }
 658         }
 659
 660         return array($is_spam, $progress);
 661 }
 662
 663 // ---------------------
 664 // Reporting
 665
 666 // Summarize $progress
 667 function summarize_check_uri_spam_progress($progress = array(), $shownum = TRUE)
 668 {
 669         $tmp = array();
 670         foreach (array_keys($progress['_action']) as $_action) {
 671                 if (is_array($progress['_action'][$_action])) {
 672                         foreach (array_keys($progress['_action'][$_action]) as $_area) {
 673                                 $tmp[] = $_action . '=>' . $_area .
 674                                         ($shownum ? '(' . $progress[$_action][$_area] . ')' : '');
 675                         }
 676                 } else {
 677                         $tmp[] = $_action .
 678                                         ($shownum ? '(' . $progress[$_action] . ')' : '');
 679                 }
 680         }
 681
 682         return implode(', ', $tmp);
 683 }
 684
 685 // Simple/fast spam filter ($target: 'a string' or an array())
 686 function pkwk_spamfilter($action, $page, $target = array('title' => ''), $method = array(), $asap = FALSE)
 687 {
 688         global $notify, $notify_subject;
 689
 690         list($is_spam, $progress) = check_uri_spam($target, $method, $asap);
 691
 692         // Mail to administrator(s)
 693         if ($is_spam && $notify) {
 694                 $footer['BLOCKED'] = 'Blocked by: ' .
 695                         summarize_check_uri_spam_progress($progress);
 696                 $footer['ACTION'] = $action;
 697                 $footer['PAGE']   = '[blocked] ' . $page;
 698                 $footer['URI']    = get_script_uri() . '?' . rawurlencode($page);
 699                 $footer['USER_AGENT']  = TRUE;
 700                 $footer['REMOTE_ADDR'] = TRUE;
 701                 pkwk_mail_notify($notify_subject,  var_export($target, TRUE), $footer);
 702                 unset($footer);
 703         }
 704
 705         if ($is_spam) spam_exit();
 706 }
 707
 708 // ---------------------
 709
 710 // Common bahavior for blocking
 711 // NOTE: Call this function from various blocking feature, to disgueise the reason 'why blocked'
 712 function spam_exit()
 713 {
 714         die("\n");
 715 }
 716
 717 ?>