spam.php

   1 <?php
   2 // $Id: spam.php,v 1.54 2006/12/03 03:23:54 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 if (! defined('SPAM_INI_FILE')) define('SPAM_INI_FILE', 'spam.ini.php');
   9
  10 // Return an array of URIs in the $string
  11 // [OK] http://nasty.example.org#nasty_string
  12 // [OK] http://nasty.example.org:80/foo/xxx#nasty_string/bar
  13 // [OK] ftp://nasty.example.org:80/dfsdfs
  14 // [OK] ftp://cnn.example.com&story=breaking_news@10.0.0.1/top_story.htm (from RFC3986)
  15 function uri_pickup($string = '', $normalize = TRUE,
  16         $preserve_rawuri = FALSE, $preserve_chunk = TRUE)
  17 {
  18         // Not available for: IDN(ignored)
  19         $array = array();
  20         preg_match_all(
  21                 // scheme://userinfo@host:port/path/or/pathinfo/maybefile.and?query=string#fragment
  22                 // Refer RFC3986 (Regex below is not strict)
  23                 '#(\b[a-z][a-z0-9.+-]{1,8})://' .       // 1: Scheme
  24                 '(?:' .
  25                         '([^\s<>"\'\[\]/\#?@]*)' .              // 2: Userinfo (Username)
  26                 '@)?' .
  27                 '(' .
  28                         // 3: Host
  29                         '\[[0-9a-f:.]+\]' . '|' .                               // IPv6([colon-hex and dot]): RFC2732
  30                         '(?:[0-9]{1-3}\.){3}[0-9]{1-3}' . '|' . // IPv4(dot-decimal): 001.22.3.44
  31                         '[^\s<>"\'\[\]:/\#?]+' .                                // FQDN: foo.example.org
  32                 ')' .
  33                 '(?::([0-9]*))?' .                                      // 4: Port
  34                 '((?:/+[^\s<>"\'\[\]/\#]+)*/+)?' .      // 5: Directory path or path-info
  35                 '([^\s<>"\'\[\]\#?]+)?' .                       // 6: File?
  36                 '(?:\?([^\s<>"\'\[\]\#]+))?' .          // 7: Query string
  37                 '(?:\#([a-z0-9._~%!$&\'()*+,;=:@-]*))?' .       // 8: Fragment
  38                 '#i',
  39                  $string, $array, PREG_SET_ORDER | PREG_OFFSET_CAPTURE
  40         );
  41         //var_dump(recursive_map('htmlspecialchars', $array));
  42
  43         // Shrink $array
  44         static $parts = array(
  45                 1 => 'scheme', 2 => 'userinfo', 3 => 'host', 4 => 'port',
  46                 5 => 'path', 6 => 'file', 7 => 'query', 8 => 'fragment'
  47         );
  48         $default = array('');
  49         foreach(array_keys($array) as $uri) {
  50                 $_uri = & $array[$uri];
  51                 array_rename_keys($_uri, $parts, TRUE, $default);
  52
  53                 $offset = $_uri['scheme'][1]; // Scheme's offset
  54                 foreach(array_keys($_uri) as $part) {
  55                         // Remove offsets for each part
  56                         $_uri[$part] = & $_uri[$part][0];
  57                 }
  58
  59                 if ($normalize) {
  60                         $_uri['scheme'] = scheme_normalize($_uri['scheme']);
  61                         if ($_uri['scheme'] === '') {
  62                                 unset ($array[$uri]);
  63                                 continue;
  64                         }
  65                         $_uri['host']  = strtolower($_uri['host']);
  66                         $_uri['port']  = port_normalize($_uri['port'], $_uri['scheme'], FALSE);
  67                         $_uri['path']  = path_normalize($_uri['path']);
  68                         $_uri['query'] = query_normalize($_uri['query']);
  69                         if ($preserve_rawuri) $_uri['rawuri'] = & $_uri[0];
  70
  71                         // DEBUG
  72                         //$_uri['uri'] = uri_array_implode($_uri);
  73                 } else {
  74                         $_uri['uri'] = & $_uri[0]; // Raw
  75                 }
  76                 unset($_uri[0]); // Matched string itself
  77                 if (! $preserve_chunk) {
  78                         unset(
  79                                 $_uri['scheme'],
  80                                 $_uri['userinfo'],
  81                                 $_uri['host'],
  82                                 $_uri['port'],
  83                                 $_uri['path'],
  84                                 $_uri['file'],
  85                                 $_uri['query'],
  86                                 $_uri['fragment']
  87                         );
  88                 }
  89                 $_uri['area']['offset'] = $offset;
  90         }
  91
  92         return $array;
  93 }
  94
  95 // Domain exposure callback (See spam_uri_pickup_preprocess())
  96 // http://victim.example.org/?foo+site:nasty.example.com+bar
  97 // => http://nasty.example.com/?refer=victim.example.org
  98 // NOTE: 'refer=' is not so good for (at this time).
  99 // Consider about using IP address of the victim, try to avoid that.
 100 function _preg_replace_callback_domain_exposure($matches = array())
 101 {
 102         $result = '';
 103
 104         // Preserve the victim URI as a complicity or ...
 105         if (isset($matches[5])) {
 106                 $result =
 107                         $matches[1] . '://' .   // scheme
 108                         $matches[2] . '/' .             // victim.example.org
 109                         $matches[3];                    // The rest of all (before victim)
 110         }
 111
 112         // Flipped URI
 113         if (isset($matches[4])) {
 114                 $result =
 115                         $matches[1] . '://' .   // scheme
 116                         $matches[4] .                   // nasty.example.com
 117                         '/?refer=' . strtolower($matches[2]) .  // victim.example.org
 118                         ' ' . $result;
 119         }
 120
 121         return $result;
 122 }
 123
 124 // Preprocess: rawurldecode() and adding space(s) and something
 125 // to detect/count some URIs _if possible_
 126 // NOTE: It's maybe danger to var_dump(result). [e.g. 'javascript:']
 127 // [OK] http://victim.example.org/go?http%3A%2F%2Fnasty.example.org
 128 // [OK] http://victim.example.org/http://nasty.example.org
 129 function spam_uri_pickup_preprocess($string = '')
 130 {
 131         if (! is_string($string)) return '';
 132
 133         $string = rawurldecode($string);
 134
 135         // Domain exposure (See _preg_replace_callback_domain_exposure())
 136         $string = preg_replace_callback(
 137                 array(
 138                         // Something Google: http://www.google.com/supported_domains
 139                         '#(http)://([a-z0-9.]+\.google\.[a-z]{2,3}(?:\.[a-z]{2})?)/' .
 140                         '([a-z0-9?=&.%_+-]+)' .         // ?query=foo+
 141                         '\bsite:([a-z0-9.%_-]+)' .      // site:nasty.example.com
 142                         //'()' .        // Preserve or remove?
 143                         '#i',
 144                 ),
 145                 '_preg_replace_callback_domain_exposure',
 146                 $string
 147         );
 148
 149         // URI exposure (uriuri => uri uri)
 150         $string = preg_replace(
 151                 array(
 152                         '#(?<! )(?:https?|ftp):/#i',
 153                 //      '#[a-z][a-z0-9.+-]{1,8}://#i',
 154                 //      '#[a-z][a-z0-9.+-]{1,8}://#i'
 155                 ),
 156                 ' $0',
 157                 $string
 158         );
 159
 160         return $string;
 161 }
 162
 163 // Main function of spam-uri pickup
 164 function spam_uri_pickup($string = '', $area = array())
 165 {
 166         if (! is_array($area) || empty($area)) {
 167                 $area = array(
 168                                 'anchor' => TRUE,
 169                                 'bbcode' => TRUE,
 170                         );
 171         }
 172
 173         $string = spam_uri_pickup_preprocess($string);
 174
 175         $array  = uri_pickup($string);
 176
 177         // Area elevation for '(especially external)link' intension
 178         if (! empty($array)) {
 179
 180                 $area_shadow = array();
 181                 foreach(array_keys($array) as $key){
 182                         $area_shadow[$key] = & $array[$key]['area'];
 183                         $area_shadow[$key]['anchor'] = 0;
 184                         $area_shadow[$key]['bbcode'] = 0;
 185                 }
 186
 187                 // Anchor tags by preg_match_all()
 188                 // [OK] <a href="http://nasty.example.com">visit http://nasty.example.com/</a>
 189                 // [OK] <a href=\'http://nasty.example.com/\' >discount foobar</a>
 190                 // [NG] <a href="http://ng.example.com">visit http://ng.example.com _not_ended_
 191                 // [NG] <a href=  >Good site!</a> <a href= "#" >test</a>
 192                 if (isset($area['anchor'])) {
 193                         $areas = array();
 194                         preg_match_all('#<a\b[^>]*href[^>]*>.*?</a\b[^>]*(>)#i',
 195                                  $string, $areas, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
 196                         //var_dump(recursive_map('htmlspecialchars', $areas));
 197                         foreach(array_keys($areas) as $_area) {
 198                                 $areas[$_area] =  array(
 199                                         $areas[$_area][0][1], // Area start (<a href>)
 200                                         $areas[$_area][1][1], // Area end   (</a>)
 201                                 );
 202                         }
 203                         area_measure($areas, $area_shadow, 1, 'anchor');
 204                 }
 205
 206                 // phpBB's "BBCode" by preg_match_all()
 207                 // [url]http://nasty.example.com/[/url]
 208                 // [link]http://nasty.example.com/[/link]
 209                 // [url=http://nasty.example.com]visit http://nasty.example.com/[/url]
 210                 // [link http://nasty.example.com/]buy something[/link]
 211                 // ?? [url=][/url]
 212                 if (isset($area['bbcode'])) {
 213                         $areas = array();
 214                         preg_match_all('#\[(url|link)\b[^\]]*\].*?\[/\1\b[^\]]*(\])#i',
 215                                  $string, $areas, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
 216                         //var_dump(recursive_map('htmlspecialchars', $areas));
 217                         foreach(array_keys($areas) as $_area) {
 218                                 $areas[$_area] = array(
 219                                         $areas[$_area][0][1], // Area start ([url])
 220                                         $areas[$_area][2][1], // Area end   ([/url])
 221                                 );
 222                         }
 223                         area_measure($areas, $area_shadow, 1, 'bbcode');
 224                 }
 225
 226                 // Various Wiki syntax
 227                 // [text_or_uri>text_or_uri]
 228                 // [text_or_uri:text_or_uri]
 229                 // [text_or_uri|text_or_uri]
 230                 // [text_or_uri->text_or_uri]
 231                 // [text_or_uri text_or_uri] // MediaWiki
 232                 // MediaWiki: [http://nasty.example.com/ visit http://nasty.example.com/]
 233
 234                 // Remove 'offset's for area_measure()
 235                 foreach(array_keys($array) as $key)
 236                         unset($array[$key]['area']['offset']);
 237         }
 238
 239         return $array;
 240 }
 241
 242 // $array['something'] => $array['wanted']
 243 function array_rename_keys(& $array, $keys = array('from' => 'to'), $force = FALSE, $default = '')
 244 {
 245         if (! is_array($array) || ! is_array($keys)) return FALSE;
 246
 247         // Nondestructive test
 248         if (! $force)
 249                 foreach(array_keys($keys) as $from)
 250                         if (! isset($array[$from]))
 251                                 return FALSE;
 252
 253         foreach($keys as $from => $to) {
 254                 if ($from === $to) continue;
 255                 if (! $force || isset($array[$from])) {
 256                         $array[$to] = & $array[$from];
 257                         unset($array[$from]);
 258                 } else  {
 259                         $array[$to] = $default;
 260                 }
 261         }
 262
 263         return TRUE;
 264 }
 265
 266 // If in doubt, it's a little doubtful
 267 function area_measure($areas, & $array, $belief = -1, $a_key = 'area', $o_key = 'offset')
 268 {
 269         if (! is_array($areas) || ! is_array($array)) return;
 270
 271         $areas_keys = array_keys($areas);
 272         foreach(array_keys($array) as $u_index) {
 273                 $offset = isset($array[$u_index][$o_key]) ?
 274                         intval($array[$u_index][$o_key]) : 0;
 275                 foreach($areas_keys as $a_index) {
 276                         if (isset($array[$u_index][$a_key])) {
 277                                 $offset_s = intval($areas[$a_index][0]);
 278                                 $offset_e = intval($areas[$a_index][1]);
 279                                 // [Area => inside <= Area]
 280                                 if ($offset_s < $offset && $offset < $offset_e) {
 281                                         $array[$u_index][$a_key] += $belief;
 282                                 }
 283                         }
 284                 }
 285         }
 286 }
 287
 288
 289 // ---------------------
 290 // Part Two
 291
 292 // Scheme normalization: Renaming the schemes
 293 // snntp://example.org =>  nntps://example.org
 294 // NOTE: Keep the static lists simple. See also port_normalize().
 295 function scheme_normalize($scheme = '', $considerd_harmfull = TRUE)
 296 {
 297         // Abbreviations considerable they don't have link intension
 298         static $abbrevs = array(
 299                 'ttp'   => 'http',
 300                 'ttps'  => 'https',
 301         );
 302
 303         // Alias => normalized
 304         static $aliases = array(
 305                 'pop'   => 'pop3',
 306                 'news'  => 'nntp',
 307                 'imap4' => 'imap',
 308                 'snntp' => 'nntps',
 309                 'snews' => 'nntps',
 310                 'spop3' => 'pop3s',
 311                 'pops'  => 'pop3s',
 312         );
 313
 314         $scheme = strtolower(trim($scheme));
 315         if (isset($abbrevs[$scheme])) {
 316                 if ($considerd_harmfull) {
 317                         $scheme = $abbrevs[$scheme];
 318                 } else {
 319                         $scheme = '';
 320                 }
 321         }
 322         if (isset($aliases[$scheme])) $scheme = $aliases[$scheme];
 323
 324         return $scheme;
 325 }
 326
 327 // Port normalization: Suppress the (redundant) default port
 328 // HTTP://example.org:80/ => http://example.org/
 329 // HTTP://example.org:8080/ => http://example.org:8080/
 330 // HTTPS://example.org:443/ => https://example.org/
 331 function port_normalize($port, $scheme, $scheme_normalize = TRUE)
 332 {
 333         // Schemes that users _maybe_ want to add protocol-handlers
 334         // to their web browsers. (and attackers _maybe_ want to use ...)
 335         // Reference: http://www.iana.org/assignments/port-numbers
 336         static $array = array(
 337                 // scheme => default port
 338                 'ftp'     =>    21,
 339                 'ssh'     =>    22,
 340                 'telnet'  =>    23,
 341                 'smtp'    =>    25,
 342                 'tftp'    =>    69,
 343                 'gopher'  =>    70,
 344                 'finger'  =>    79,
 345                 'http'    =>    80,
 346                 'pop3'    =>   110,
 347                 'sftp'    =>   115,
 348                 'nntp'    =>   119,
 349                 'imap'    =>   143,
 350                 'irc'     =>   194,
 351                 'wais'    =>   210,
 352                 'https'   =>   443,
 353                 'nntps'   =>   563,
 354                 'rsync'   =>   873,
 355                 'ftps'    =>   990,
 356                 'telnets' =>   992,
 357                 'imaps'   =>   993,
 358                 'ircs'    =>   994,
 359                 'pop3s'   =>   995,
 360                 'mysql'   =>  3306,
 361         );
 362
 363         $port = trim($port);
 364         if ($port === '') return $port;
 365
 366         if ($scheme_normalize) $scheme = scheme_normalize($scheme);
 367         if (isset($array[$scheme]) && $port == $array[$scheme])
 368                 $port = ''; // Ignore the defaults
 369
 370         return $port;
 371 }
 372
 373 // Path normalization
 374 // http://example.org => http://example.org/
 375 // http://example.org#hoge => http://example.org/#hoge
 376 // http://example.org/path/a/b/./c////./d => http://example.org/path/a/b/c/d
 377 // http://example.org/path/../../a/../back => http://example.org/back
 378 function path_normalize($path = '', $divider = '/', $addroot = TRUE)
 379 {
 380         if (! is_string($path) || $path == '') {
 381                 $path = $addroot ? $divider : '';
 382         } else {
 383                 $path = trim($path);
 384                 $last = ($path[strlen($path) - 1] == $divider) ? $divider : '';
 385                 $array = explode($divider, $path);
 386
 387                 // Remove paddings
 388                 foreach(array_keys($array) as $key) {
 389                         if ($array[$key] == '' || $array[$key] == '.')
 390                                  unset($array[$key]);
 391                 }
 392                 // Back-track
 393                 $tmp = array();
 394                 foreach($array as $value) {
 395                         if ($value == '..') {
 396                                 array_pop($tmp);
 397                         } else {
 398                                 array_push($tmp, $value);
 399                         }
 400                 }
 401                 $array = & $tmp;
 402
 403                 $path = $addroot ? $divider : '';
 404                 if (! empty($array)) $path .= implode($divider, $array) . $last;
 405         }
 406
 407         return $path;
 408 }
 409
 410 // Sort query-strings if possible
 411 // [OK] &&&&f=d&b&d&c&a=0dd  =>  a=0dd&b&c&d&f=d
 412 function query_normalize($string = '')
 413 {
 414         $array = explode('&', $string);
 415
 416         // Remove paddings
 417         foreach(array_keys($array) as $key) {
 418                 if ($array[$key] == '') {
 419                          unset($array[$key]);
 420                 }
 421         }
 422
 423         natsort($array);
 424         return implode('&', $array);
 425 }
 426
 427 // An URI array => An URI (See uri_pickup())
 428 function uri_array_implode($uri = array())
 429 {
 430         if (empty($uri) || ! is_array($uri)) return NULL;
 431
 432         $tmp = array();
 433         if (isset($uri['scheme']) && $uri['scheme'] !== '') {
 434                 $tmp[] = & $uri['scheme'];
 435                 $tmp[] = '://';
 436         }
 437         if (isset($uri['userinfo']) && $uri['userinfo'] !== '') {
 438                 $tmp[] = & $uri['userinfo'];
 439                 $tmp[] = '@';
 440         }
 441         if (isset($uri['host']) && $uri['host'] !== '') {
 442                 $tmp[] = & $uri['host'];
 443         }
 444         if (isset($uri['port']) && $uri['port'] !== '') {
 445                 $tmp[] = ':';
 446                 $tmp[] = & $uri['port'];
 447         }
 448         if (isset($uri['path']) && $uri['path'] !== '') {
 449                 $tmp[] = & $uri['path'];
 450         }
 451         if (isset($uri['file']) && $uri['file'] !== '') {
 452                 $tmp[] = & $uri['file'];
 453         }
 454         if (isset($uri['query']) && $uri['query'] !== '') {
 455                 $tmp[] = '?';
 456                 $tmp[] = & $uri['query'];
 457         }
 458         if (isset($uri['fragment']) && $uri['fragment'] !== '') {
 459                 $tmp[] = '#';
 460                 $tmp[] = & $uri['fragment'];
 461         }
 462
 463         return implode('', $tmp);
 464 }
 465
 466 // ---------------------
 467 // Part One : Checker
 468
 469 function generate_glob_regex($string = '', $divider = '/')
 470 {
 471         static $from = array(
 472                          1 => '*',
 473                         11 => '?',
 474         //              22 => '[',      // Maybe cause regex compilation error (e.g. '[]')
 475         //              23 => ']',      //
 476                 );
 477         static $mid = array(
 478                          1 => '_AST_',
 479                         11 => '_QUE_',
 480         //              22 => '_RBR_',
 481         //              23 => '_LBR_',
 482                 );
 483         static $to = array(
 484                          1 => '.*',
 485                         11 => '.',
 486         //              22 => '[',
 487         //              23 => ']',
 488                 );
 489
 490         if (is_array($string)) {
 491                 // Recurse
 492                 return '(?:' .
 493                         implode('|',    // OR
 494                                 array_map('generate_glob_regex',
 495                                         $string,
 496                                         array_pad(array(), count($string), $divider)
 497                                 )
 498                         ) .
 499                 ')';
 500         } else {
 501                 $string = str_replace($from, $mid, $string); // Hide
 502                 $string = preg_quote($string, $divider);
 503                 $string = str_replace($mid, $to, $string);   // Unhide
 504                 return $string;
 505         }
 506 }
 507
 508 // TODO: Ignore list
 509 // TODO: preg_grep() ?
 510 // TODO: Multi list
 511 function is_badhost($hosts = '', $asap = TRUE)
 512 {
 513         static $regex;
 514
 515         if (! isset($regex)) {
 516                 $regex = array();
 517                 $regex['badhost'] = array();
 518
 519                 // Sample
 520                 if (TRUE) {
 521                         $blocklist['badhost'] = array(
 522                                 //'*',                  // Deny all uri
 523                                 //'10.20.*.*',  // 10.20.example.com also matches
 524                                 //'*.blogspot.com',     // Blog services subdomains
 525                                 //array('blogspot.com', '*.blogspot.com')
 526                         );
 527                         foreach ($blocklist['badhost'] as $part) {
 528                                 $regex['badhost'][] = '/^' . generate_glob_regex($part) . '$/i';
 529                         }
 530                 }
 531
 532                 // Load
 533                 if (file_exists(SPAM_INI_FILE)) {
 534                         $blocklist = array();
 535                         require(SPAM_INI_FILE);
 536                         foreach ($blocklist['badhost'] as $part) {
 537                                 $regex['badhost'][] = '/^' . generate_glob_regex($part) . '$/i';
 538                         }
 539                 }
 540         }
 541         //var_dump($regex);
 542
 543         $result = 0;
 544         if (! is_array($hosts)) $hosts = array($hosts);
 545
 546         foreach($hosts as $host) {
 547                 if (! is_string($host)) $host = '';
 548
 549                 // badhost
 550                 foreach ($regex['badhost'] as $_regex) {
 551                         if (preg_match($_regex, $host)) {
 552                                 ++$result;
 553                                 if ($asap) {
 554                                         return $result;
 555                                 } else {
 556                                         break;
 557                                 }
 558                         }
 559                 }
 560         }
 561
 562         return $result;
 563 }
 564
 565 // Default (enabled) methods and thresholds
 566 function check_uri_spam_method($times = 1, $t_area = 0, $rule = TRUE)
 567 {
 568         $times  = intval($times);
 569         $t_area = intval($t_area);
 570
 571         // Thresholds
 572         $method = array(
 573                 'quantity' => 8 * $times,       // Allow N URIs
 574                 'non_uniq' => 3 * $times,       // Allow N duped (and normalized) URIs
 575         );
 576
 577         // Areas
 578         $area = array(
 579                 //'total'  => $t_area,  // Allow N areas total, enabled below
 580                 'anchor'   => $t_area,  // Inside <a href> HTML tag
 581                 'bbcode'   => $t_area,  // Inside [url] or [link] BBCode
 582         );
 583
 584         // Rules
 585         $rules = array(
 586                 'badhost'  => TRUE,     // Check badhost
 587         );
 588
 589         // Remove unused
 590         foreach (array_keys($method) as $key) {
 591                 if ($method[$key] < 0) unset($method[$key]);
 592         }
 593         foreach (array_keys($area) as $key) {
 594                 if ($area[$key] < 0) unset($area[$key]);
 595         }
 596         $area  = empty($area) ? array() : array('area' => $area);
 597         $rules = $rule ? $rules : array();
 598
 599         return $method + $area + $rules;
 600 }
 601
 602
 603 // TODO: Simplify. !empty(['_action']) just means $is_spam
 604 // Simple/fast spam check
 605 function check_uri_spam($target = '', $method = array(), $asap = TRUE)
 606 {
 607         $is_spam  = FALSE;
 608         $progress = array(
 609                 'quantity'   => 0,
 610                 'area' => array(
 611                         'total'  => 0,
 612                         'anchor' => 0,
 613                         'bbcode' => 0,
 614                         ),
 615                 'non_uniq'   => 0,
 616                 'uniqhost'   => 0,
 617                 'badhost'    => 0,
 618                 '_action'    => array(),
 619                 );
 620
 621         if (! is_array($method) || empty($method)) {
 622                 $method = check_uri_spam_method();
 623         }
 624
 625         if (is_array($target)) {
 626                 // Recurse
 627                 foreach($target as $str) {
 628                         list($_is_spam, $_progress) = check_uri_spam($str, $method, $asap);
 629                         $is_spam = $is_spam || $_is_spam;
 630                         $progress['quantity']       += $_progress['quantity'];
 631                         $progress['area']['total']  += $_progress['area']['total'];
 632                         $progress['area']['anchor'] += $_progress['area']['anchor'];
 633                         $progress['area']['bbcode'] += $_progress['area']['bbcode'];
 634                         $progress['non_uniq']       += $_progress['non_uniq'];
 635                         $progress['uniqhost']       += $_progress['uniqhost'];
 636                         $progress['badhost']        += $_progress['badhost'];
 637                         foreach($_progress['_action'] as $key => $value) {
 638                                 if (is_array($value)) {
 639                                         foreach(array_keys($value) as $_key) {
 640                                                 $progress['_action'][$key][$_key] = TRUE;
 641                                         }
 642                                 } else {
 643                                         $progress['_action'][$key] = TRUE;
 644                                 }
 645                         }
 646                         if ($is_spam && $asap) break;
 647                 }
 648         } else {
 649                 $pickups = spam_uri_pickup($target);
 650                 if (! empty($pickups)) {
 651                         $progress['quantity'] += count($pickups);
 652
 653                         // URI quantity
 654                         if ((! $is_spam || ! $asap) && isset($method['quantity']) &&
 655                                 $progress['quantity'] > $method['quantity']) {
 656                                 $is_spam = TRUE;
 657                                 $progress['_action']['quantity'] = TRUE;
 658                         }
 659                         //var_dump($method['quantity'], $is_spam);
 660
 661                         // Using invalid area
 662                         if ((! $is_spam || ! $asap) && isset($method['area'])) {
 663                                 foreach($pickups as $pickup) {
 664                                         foreach ($pickup['area'] as $key => $value) {
 665                                                 if ($key == 'offset') continue;
 666                                                 $progress['area']['total'] += $value;
 667                                                 $progress['area'][$key]    += $value;
 668                                                 if (isset($method['area']['total']) &&
 669                                                                 $progress['area']['total'] > $method['area']['total']) {
 670                                                         $is_spam = TRUE;
 671                                                         $progress['_action']['area']['total'] = TRUE;
 672                                                         if ($is_spam && $asap) break;
 673                                                 }
 674                                                 if(isset($method['area'][$key]) &&
 675                                                                 $progress['area'][$key] > $method['area'][$key]) {
 676                                                         $is_spam = TRUE;
 677                                                         $progress['_action']['area'][$key] = TRUE;
 678                                                         if ($is_spam && $asap) break;
 679                                                 }
 680                                         }
 681                                         if ($is_spam && $asap) break;
 682                                 }
 683                         }
 684                         //var_dump($method['area'], $is_spam);
 685
 686                         // URI uniqueness (and removing non-uniques)
 687                         if ((! $is_spam || ! $asap) && isset($method['non_uniq'])) {
 688                                 $uris = array();
 689                                 foreach ($pickups as $key => $pickup) {
 690                                         $uris[$key] = uri_array_implode($pickup);
 691                                 }
 692                                 $count = count($uris);
 693                                 $uris = array_unique($uris);
 694                                 $progress['non_uniq'] += $count - count($uris);
 695                                 if ($progress['non_uniq'] > $method['non_uniq']) {
 696                                         $is_spam = TRUE;
 697                                         $progress['_action']['non_uniq'] = TRUE;
 698                                 }
 699                                 if (! $asap || ! $is_spam) {
 700                                         foreach (array_diff(array_keys($pickups),
 701                                                 array_keys($uris)) as $remove) {
 702                                                 unset($pickups[$remove]);
 703                                         }
 704                                 }
 705                                 unset($uris);
 706                         }
 707                         //var_dump($method['non_uniq'], $is_spam);
 708
 709                         // Unique host
 710                         $hosts = array();
 711                         foreach ($pickups as $pickup) {
 712                                 $hosts[] = & $pickup['host'];
 713                         }
 714                         $hosts = array_unique($hosts);
 715                         $progress['uniqhost'] += count($hosts);
 716                         //var_dump($method['uniqhost'], $is_spam);
 717
 718                         // Bad host
 719                         if ((! $is_spam || ! $asap) && isset($method['badhost'])) {
 720                                 $count = is_badhost($hosts, $asap);
 721                                 $progress['badhost'] += $count;
 722                                 if ($count !== 0) {
 723                                         $progress['_action']['badhost'] = TRUE;
 724                                         $is_spam = TRUE;
 725                                 }
 726                         }
 727                         //var_dump($method['badhost'], $is_spam);
 728                 }
 729         }
 730
 731         return array($is_spam, $progress);
 732 }
 733
 734 // ---------------------
 735 // Reporting
 736
 737 // TODO: Show all
 738 // Summarize $progress (blocked only)
 739 function summarize_check_uri_spam_progress($progress = array(), $shownum = TRUE)
 740 {
 741         //$list = check_uri_spam_method();
 742
 743         $tmp = array();
 744         foreach (array_keys($progress['_action']) as $_action) {
 745                 if (is_array($progress['_action'][$_action])) {
 746                         foreach (array_keys($progress['_action'][$_action]) as $_area) {
 747                                 $tmp[] = $_action . '=>' . $_area .
 748                                         ($shownum ? '(' . $progress[$_action][$_area] . ')' : '');
 749                         }
 750                 } else {
 751                         $tmp[] = $_action .
 752                                         ($shownum ? '(' . $progress[$_action] . ')' : '');
 753                 }
 754         }
 755
 756         return implode(', ', $tmp);
 757 }
 758
 759 // ---------------------
 760 // Exit
 761
 762 // Common bahavior for blocking
 763 // NOTE: Call this function from various blocking feature, to disgueise the reason 'why blocked'
 764 function spam_exit()
 765 {
 766         die("\n");
 767 }
 768
 769
 770 // ---------------------
 771 //
 772
 773 // Simple/fast spam filter ($target: 'a string' or an array())
 774 function pkwk_spamfilter($action, $page, $target = array('title' => ''), $method = array(), $asap = FALSE)
 775 {
 776         global $notify;
 777
 778         list($is_spam, $progress) = check_uri_spam($target, $method, $asap);
 779
 780         if ($is_spam) {
 781                 // Mail to administrator(s)
 782                 if ($notify) pkwk_spamnotify($action, $page, $target, $progress);
 783                 // End
 784                 spam_exit();
 785         }
 786 }
 787
 788 // ---------------------
 789 // PukiWiki original
 790
 791 // Mail to administrator(s)
 792 function pkwk_spamnotify($action, $page, $target = array('title' => ''), $progress = array())
 793 {
 794         global $notify_subject;
 795
 796         $footer['ACTION'] = 'Blocked by: ' . summarize_check_uri_spam_progress($progress);
 797         $footer['COMMENT'] = $action;
 798         $footer['PAGE']   = '[blocked] ' . $page;
 799         $footer['URI']    = get_script_uri() . '?' . rawurlencode($page);
 800         $footer['USER_AGENT']  = TRUE;
 801         $footer['REMOTE_ADDR'] = TRUE;
 802         pkwk_mail_notify($notify_subject,  var_export($target, TRUE), $footer);
 803 }
 804
 805 ?>