= 4.3.0): preg_match_all(PREG_OFFSET_CAPTURE): $method['uri_XXX'] related feature
if (! defined('SPAM_INI_FILE')) define('SPAM_INI_FILE', 'spam.ini.php');
// ---------------------
// Compat etc
// (PHP 4 >= 4.2.0): var_export(): mail-reporting and dump related
if (! function_exists('var_export')) {
function var_export() {
return 'var_export() is not found on this server' . "\n";
}
}
// (PHP 4 >= 4.2.0): preg_grep() enables invert option
function preg_grep_invert($pattern = '//', $input = array())
{
static $invert;
if (! isset($invert)) $invert = defined('PREG_GREP_INVERT');
if ($invert) {
return preg_grep($pattern, $input, PREG_GREP_INVERT);
} else {
$result = preg_grep($pattern, $input);
if ($result) {
return array_diff($input, preg_grep($pattern, $input));
} else {
return $input;
}
}
}
// ---------------------
// URI pickup
// Return an array of URIs in the $string
// [OK] http://nasty.example.org#nasty_string
// [OK] http://nasty.example.org:80/foo/xxx#nasty_string/bar
// [OK] ftp://nasty.example.org:80/dfsdfs
// [OK] ftp://cnn.example.com&story=breaking_news@10.0.0.1/top_story.htm (from RFC3986)
function uri_pickup($string = '', $normalize = TRUE,
$preserve_rawuri = FALSE, $preserve_chunk = TRUE)
{
// Not available for: IDN(ignored)
$array = array();
preg_match_all(
// scheme://userinfo@host:port/path/or/pathinfo/maybefile.and?query=string#fragment
// Refer RFC3986 (Regex below is not strict)
'#(\b[a-z][a-z0-9.+-]{1,8}):/+' . // 1: Scheme
'(?:' .
'([^\s<>"\'\[\]/\#?@]*)' . // 2: Userinfo (Username)
'@)?' .
'(' .
// 3: Host
'\[[0-9a-f:.]+\]' . '|' . // IPv6([colon-hex and dot]): RFC2732
'(?:[0-9]{1-3}\.){3}[0-9]{1-3}' . '|' . // IPv4(dot-decimal): 001.22.3.44
'[a-z0-9.-]+' . // hostname(FQDN) : foo.example.org
')' .
'(?::([0-9]*))?' . // 4: Port
'((?:/+[^\s<>"\'\[\]/\#]+)*/+)?' . // 5: Directory path or path-info
'([^\s<>"\'\[\]\#?]+)?' . // 6: File?
'(?:\?([^\s<>"\'\[\]\#]+))?' . // 7: Query string
'(?:\#([a-z0-9._~%!$&\'()*+,;=:@-]*))?' . // 8: Fragment
'#i',
$string, $array, PREG_SET_ORDER | PREG_OFFSET_CAPTURE
);
// Shrink $array
static $parts = array(
1 => 'scheme', 2 => 'userinfo', 3 => 'host', 4 => 'port',
5 => 'path', 6 => 'file', 7 => 'query', 8 => 'fragment'
);
$default = array('');
foreach(array_keys($array) as $uri) {
$_uri = & $array[$uri];
array_rename_keys($_uri, $parts, TRUE, $default);
$offset = $_uri['scheme'][1]; // Scheme's offset
foreach(array_keys($_uri) as $part) {
// Remove offsets for each part
$_uri[$part] = & $_uri[$part][0];
}
if ($normalize) {
$_uri['scheme'] = scheme_normalize($_uri['scheme']);
if ($_uri['scheme'] === '') {
unset($array[$uri]);
continue;
}
$_uri['host'] = strtolower($_uri['host']);
$_uri['port'] = port_normalize($_uri['port'], $_uri['scheme'], FALSE);
$_uri['path'] = path_normalize($_uri['path']);
if ($preserve_rawuri) $_uri['rawuri'] = & $_uri[0];
// DEBUG
//$_uri['uri'] = uri_array_implode($_uri);
} else {
$_uri['uri'] = & $_uri[0]; // Raw
}
unset($_uri[0]); // Matched string itself
if (! $preserve_chunk) {
unset(
$_uri['scheme'],
$_uri['userinfo'],
$_uri['host'],
$_uri['port'],
$_uri['path'],
$_uri['file'],
$_uri['query'],
$_uri['fragment']
);
}
// Area offset for area_measure()
$_uri['area']['offset'] = $offset;
}
return $array;
}
// Destructive normalize of URI array
// NOTE: Give me the uri_pickup() result with chunks
function uri_array_normalize(& $pickups, $preserve = TRUE)
{
if (! is_array($pickups)) return $pickups;
foreach (array_keys($pickups) as $key) {
$_key = & $pickups[$key];
$_key['path'] = isset($_key['path']) ? strtolower($_key['path']) : '';
$_key['file'] = isset($_key['file']) ? file_normalize($_key['file']) : '';
$_key['query'] = isset($_key['query']) ? query_normalize(strtolower($_key['query']), TRUE) : '';
$_key['fragment'] = (isset($_key['fragment']) && $preserve) ?
strtolower($_key['fragment']) : ''; // Just ignore
}
return $pickups;
}
// An URI array => An URI (See uri_pickup())
function uri_array_implode($uri = array())
{
if (empty($uri) || ! is_array($uri)) return NULL;
$tmp = array();
if (isset($uri['scheme']) && $uri['scheme'] !== '') {
$tmp[] = & $uri['scheme'];
$tmp[] = '://';
}
if (isset($uri['userinfo']) && $uri['userinfo'] !== '') {
$tmp[] = & $uri['userinfo'];
$tmp[] = '@';
}
if (isset($uri['host']) && $uri['host'] !== '') {
$tmp[] = & $uri['host'];
}
if (isset($uri['port']) && $uri['port'] !== '') {
$tmp[] = ':';
$tmp[] = & $uri['port'];
}
if (isset($uri['path']) && $uri['path'] !== '') {
$tmp[] = & $uri['path'];
}
if (isset($uri['file']) && $uri['file'] !== '') {
$tmp[] = & $uri['file'];
}
if (isset($uri['query']) && $uri['query'] !== '') {
$tmp[] = '?';
$tmp[] = & $uri['query'];
}
if (isset($uri['fragment']) && $uri['fragment'] !== '') {
$tmp[] = '#';
$tmp[] = & $uri['fragment'];
}
return implode('', $tmp);
}
// $array['something'] => $array['wanted']
function array_rename_keys(& $array, $keys = array('from' => 'to'), $force = FALSE, $default = '')
{
if (! is_array($array) || ! is_array($keys)) return FALSE;
// Nondestructive test
if (! $force)
foreach(array_keys($keys) as $from)
if (! isset($array[$from]))
return FALSE;
foreach($keys as $from => $to) {
if ($from === $to) continue;
if (! $force || isset($array[$from])) {
$array[$to] = & $array[$from];
unset($array[$from]);
} else {
$array[$to] = $default;
}
}
return TRUE;
}
// ---------------------
// Area pickup
// Pickup all of markup areas
function area_pickup($string = '', $method = array())
{
$area = array();
if (empty($method)) return $area;
// Anchor tag pair by preg_match and preg_match_all()
// [OK]
// [OK] Good site!
// [OK] test
// [OK] visit http://nasty.example.com/
// [OK] discount foobar
// [NG] visit http://ng.example.com _not_ended_
$regex = '#]*\bhref\b[^>]*>.*?]*(>)#i';
if (isset($method['area_anchor'])) {
$areas = array();
$count = isset($method['asap']) ?
preg_match($regex, $string) :
preg_match_all($regex, $string, $areas);
if (! empty($count)) $area['area_anchor'] = $count;
}
if (isset($method['uri_anchor'])) {
$areas = array();
preg_match_all($regex, $string, $areas, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
foreach(array_keys($areas) as $_area) {
$areas[$_area] = array(
$areas[$_area][0][1], // Area start ()
$areas[$_area][1][1], // Area end ()
);
}
if (! empty($areas)) $area['uri_anchor'] = $areas;
}
// phpBB's "BBCode" pair by preg_match and preg_match_all()
// [OK] [url][/url]
// [OK] [url]http://nasty.example.com/[/url]
// [OK] [link]http://nasty.example.com/[/link]
// [OK] [url=http://nasty.example.com]visit http://nasty.example.com/[/url]
// [OK] [link http://nasty.example.com/]buy something[/link]
$regex = '#\[(url|link)\b[^\]]*\].*?\[/\1\b[^\]]*(\])#i';
if (isset($method['area_bbcode'])) {
$areas = array();
$count = isset($method['asap']) ?
preg_match($regex, $string) :
preg_match_all($regex, $string, $areas, PREG_SET_ORDER);
if (! empty($count)) $area['area_bbcode'] = $count;
}
if (isset($method['uri_bbcode'])) {
$areas = array();
preg_match_all($regex, $string, $areas, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
foreach(array_keys($areas) as $_area) {
$areas[$_area] = array(
$areas[$_area][0][1], // Area start ([url])
$areas[$_area][2][1], // Area end ([/url])
);
}
if (! empty($areas)) $area['uri_bbcode'] = $areas;
}
// Various Wiki syntax
// [text_or_uri>text_or_uri]
// [text_or_uri:text_or_uri]
// [text_or_uri|text_or_uri]
// [text_or_uri->text_or_uri]
// [text_or_uri text_or_uri] // MediaWiki
// MediaWiki: [http://nasty.example.com/ visit http://nasty.example.com/]
return $area;
}
// If in doubt, it's a little doubtful
// if (Area => inside <= Area) $brief += -1
function area_measure($areas, & $array, $belief = -1, $a_key = 'area', $o_key = 'offset')
{
if (! is_array($areas) || ! is_array($array)) return;
$areas_keys = array_keys($areas);
foreach(array_keys($array) as $u_index) {
$offset = isset($array[$u_index][$o_key]) ?
intval($array[$u_index][$o_key]) : 0;
foreach($areas_keys as $a_index) {
if (isset($array[$u_index][$a_key])) {
$offset_s = intval($areas[$a_index][0]);
$offset_e = intval($areas[$a_index][1]);
// [Area => inside <= Area]
if ($offset_s < $offset && $offset < $offset_e) {
$array[$u_index][$a_key] += $belief;
}
}
}
}
}
// ---------------------
// Spam-uri pickup
// Domain exposure callback (See spam_uri_pickup_preprocess())
// http://victim.example.org/?foo+site:nasty.example.com+bar
// => http://nasty.example.com/?refer=victim.example.org
// NOTE: 'refer=' is not so good for (at this time).
// Consider about using IP address of the victim, try to avoid that.
function _preg_replace_callback_domain_exposure($matches = array())
{
$result = '';
// Preserve the victim URI as a complicity or ...
if (isset($matches[5])) {
$result =
$matches[1] . '://' . // scheme
$matches[2] . '/' . // victim.example.org
$matches[3]; // The rest of all (before victim)
}
// Flipped URI
if (isset($matches[4])) {
$result =
$matches[1] . '://' . // scheme
$matches[4] . // nasty.example.com
'/?refer=' . strtolower($matches[2]) . // victim.example.org
' ' . $result;
}
return $result;
}
// Preprocess: rawurldecode() and adding space(s) and something
// to detect/count some URIs _if possible_
// NOTE: It's maybe danger to var_dump(result). [e.g. 'javascript:']
// [OK] http://victim.example.org/go?http%3A%2F%2Fnasty.example.org
// [OK] http://victim.example.org/http://nasty.example.org
// TODO: link.toolbot.com, urlx.org
function spam_uri_pickup_preprocess($string = '')
{
if (! is_string($string)) return '';
$string = rawurldecode($string);
// Domain exposure (See _preg_replace_callback_domain_exposure())
$string = preg_replace_callback(
array(
'#(http)://' .
'(' .
// Something Google: http://www.google.com/supported_domains
'(?:[a-z0-9.]+\.)?google\.[a-z]{2,3}(?:\.[a-z]{2})?' .
'|' .
// AltaVista
'(?:[a-z0-9.]+\.)?altavista.com' .
')' .
'/' .
'([a-z0-9?=&.%_/\'\\\+-]+)' . // path/?query=foo+bar+
'\bsite:([a-z0-9.%_-]+\.[a-z0-9.%_-]+)' . // site:nasty.example.com
//'()' . // Preserve or remove?
'#i',
),
'_preg_replace_callback_domain_exposure',
$string
);
// URI exposure (uriuri => uri uri)
$string = preg_replace(
array(
'#(? nntps://example.org
// NOTE: Keep the static lists simple. See also port_normalize().
function scheme_normalize($scheme = '', $considerd_harmfull = TRUE)
{
// Abbreviations considerable they don't have link intension
static $abbrevs = array(
'ttp' => 'http',
'ttps' => 'https',
);
// Alias => normalized
static $aliases = array(
'pop' => 'pop3',
'news' => 'nntp',
'imap4' => 'imap',
'snntp' => 'nntps',
'snews' => 'nntps',
'spop3' => 'pop3s',
'pops' => 'pop3s',
);
$scheme = strtolower(trim($scheme));
if (isset($abbrevs[$scheme])) {
if ($considerd_harmfull) {
$scheme = $abbrevs[$scheme];
} else {
$scheme = '';
}
}
if (isset($aliases[$scheme])) $scheme = $aliases[$scheme];
return $scheme;
}
// Port normalization: Suppress the (redundant) default port
// HTTP://example.org:80/ => http://example.org/
// HTTP://example.org:8080/ => http://example.org:8080/
// HTTPS://example.org:443/ => https://example.org/
function port_normalize($port, $scheme, $scheme_normalize = TRUE)
{
// Schemes that users _maybe_ want to add protocol-handlers
// to their web browsers. (and attackers _maybe_ want to use ...)
// Reference: http://www.iana.org/assignments/port-numbers
static $array = array(
// scheme => default port
'ftp' => 21,
'ssh' => 22,
'telnet' => 23,
'smtp' => 25,
'tftp' => 69,
'gopher' => 70,
'finger' => 79,
'http' => 80,
'pop3' => 110,
'sftp' => 115,
'nntp' => 119,
'imap' => 143,
'irc' => 194,
'wais' => 210,
'https' => 443,
'nntps' => 563,
'rsync' => 873,
'ftps' => 990,
'telnets' => 992,
'imaps' => 993,
'ircs' => 994,
'pop3s' => 995,
'mysql' => 3306,
);
$port = trim($port);
if ($port === '') return $port;
if ($scheme_normalize) $scheme = scheme_normalize($scheme);
if (isset($array[$scheme]) && $port == $array[$scheme])
$port = ''; // Ignore the defaults
return $port;
}
// Path normalization
// http://example.org => http://example.org/
// http://example.org#hoge => http://example.org/#hoge
// http://example.org/path/a/b/./c////./d => http://example.org/path/a/b/c/d
// http://example.org/path/../../a/../back => http://example.org/back
function path_normalize($path = '', $divider = '/', $addroot = TRUE)
{
if (! is_string($path) || $path == '')
return $addroot ? $divider : '';
$path = trim($path);
$last = ($path[strlen($path) - 1] == $divider) ? $divider : '';
$array = explode($divider, $path);
// Remove paddings
foreach(array_keys($array) as $key) {
if ($array[$key] == '' || $array[$key] == '.')
unset($array[$key]);
}
// Back-track
$tmp = array();
foreach($array as $value) {
if ($value == '..') {
array_pop($tmp);
} else {
array_push($tmp, $value);
}
}
$array = & $tmp;
$path = $addroot ? $divider : '';
if (! empty($array)) $path .= implode($divider, $array) . $last;
return $path;
}
// DirectoryIndex normalize (Destructive and rough)
function file_normalize($string = 'index.html.en')
{
static $array = array(
'index' => TRUE, // Some system can omit the suffix
'index.htm' => TRUE,
'index.html' => TRUE,
'index.shtml' => TRUE,
'index.jsp' => TRUE,
'index.php' => TRUE,
'index.php3' => TRUE,
'index.php4' => TRUE,
//'index.pl' => TRUE,
//'index.py' => TRUE,
//'index.rb' => TRUE,
'index.cgi' => TRUE,
'default.htm' => TRUE,
'default.html' => TRUE,
'default.asp' => TRUE,
'default.aspx' => TRUE,
);
// Content-negothiation filter:
// Roughly removing ISO 639 -like
// 2-letter suffixes (See RFC3066)
$matches = array();
if (preg_match('/(.*)\.[a-z][a-z](?:-[a-z][a-z])?$/i', $string, $matches)) {
$_string = $matches[1];
} else {
$_string = & $string;
}
if (isset($array[strtolower($_string)])) {
return '';
} else {
return $string;
}
}
// Sort query-strings if possible (Destructive and rough)
// [OK] &&&&f=d&b&d&c&a=0dd => a=0dd&b&c&d&f=d
// [OK] nothing==&eg=dummy&eg=padding&eg=foobar => eg=foobar
function query_normalize($string = '', $equal = FALSE, $equal_cutempty = TRUE)
{
$array = explode('&', $string);
// Remove '&' paddings
foreach(array_keys($array) as $key) {
if ($array[$key] == '') {
unset($array[$key]);
}
}
// Consider '='-sepalated input and paddings
if ($equal) {
$equals = $not_equals = array();
foreach ($array as $part) {
if (strpos($part, '=') === FALSE) {
$not_equals[] = $part;
} else {
list($key, $value) = explode('=', $part, 2);
$value = ltrim($value, '=');
if (! $equal_cutempty || $value != '') {
$equals[$key] = $value;
}
}
}
$array = & $not_equals;
foreach ($equals as $key => $value) {
$array[] = $key . '=' . $value;
}
unset($equals);
}
natsort($array);
return implode('&', $array);
}
// ---------------------
// Part One : Checker
function generate_glob_regex($string = '', $divider = '/')
{
static $from = array(
1 => '*',
11 => '?',
// 22 => '[', // Maybe cause regex compilation error (e.g. '[]')
// 23 => ']', //
);
static $mid = array(
1 => '_AST_',
11 => '_QUE_',
// 22 => '_RBR_',
// 23 => '_LBR_',
);
static $to = array(
1 => '.*',
11 => '.',
// 22 => '[',
// 23 => ']',
);
if (is_array($string)) {
// Recurse
return '(?:' .
implode('|', // OR
array_map('generate_glob_regex',
$string,
array_pad(array(), count($string), $divider)
)
) .
')';
} else {
$string = str_replace($from, $mid, $string); // Hide
$string = preg_quote($string, $divider);
$string = str_replace($mid, $to, $string); // Unhide
return $string;
}
}
function get_blocklist($list = '')
{
static $regexs;
if (! isset($regexs)) {
$regexs = array();
if (file_exists(SPAM_INI_FILE)) {
$blocklist = array();
include(SPAM_INI_FILE);
// $blocklist['badhost'] = array(
// '*.blogspot.com', // Blog services's subdomains (only)
// 'IANA-examples' => '#^(?:.*\.)?example\.(?:com|net|org)$#',
// );
foreach(array('goodhost', 'badhost') as $_list) {
if (! isset($blocklist[$list])) continue;
foreach ($blocklist[$_list] as $key => $value) {
if (is_string($key)) {
$regexs[$_list][$key] = $value;
} else {
$regexs[$_list][$value] =
'/^(?:www\.)?' . generate_glob_regex($value, '/') . '$/i';
}
}
}
}
}
if ($list == '') {
return $regexs; // ALL
} else if (isset($regexs[$list])) {
return $regexs[$list];
} else {
return array();
}
}
function is_badhost($hosts = array(), $asap = TRUE, & $remains)
{
$result = array();
if (! is_array($hosts)) $hosts = array($hosts);
foreach(array_keys($hosts) as $key) {
if (! is_string($hosts[$key])) unset($hosts[$key]);
}
if (empty($hosts)) return $result;
foreach (get_blocklist('goodhost') as $regex) {
$hosts = preg_grep_invert($regex, $hosts);
}
if (empty($hosts)) return $result;
$tmp = array();
foreach (get_blocklist('badhost') as $label => $regex) {
$result[$label] = preg_grep($regex, $hosts);
if (empty($result[$label])) {
unset($result[$label]);
} else {
$hosts = array_diff($hosts, $result[$label]);
if ($asap) break;
}
}
$remains = $hosts;
return $result;
}
// Default (enabled) methods and thresholds (for content insertion)
function check_uri_spam_method($times = 1, $t_area = 0, $rule = TRUE)
{
$times = intval($times);
$t_area = intval($t_area);
$positive = array(
// Thresholds
'quantity' => 8 * $times, // Allow N URIs
'non_uniqhost' => 3 * $times, // Allow N duped (and normalized) Hosts
//'non_uniquri'=> 3 * $times, // Allow N duped (and normalized) URIs
// Areas
'area_anchor' => $t_area, // Using HTML tag
'area_bbcode' => $t_area, // Using [url] or [link] BBCode
//'uri_anchor' => $t_area, // URI inside HTML tag
//'uri_bbcode' => $t_area, // URI inside [url] or [link] BBCode
);
if ($rule) {
$bool = array(
// Rules
//'asap' => TRUE, // Quit or return As Soon As Possible
'uniqhost' => TRUE, // Show uniq host (at block notification mail)
'badhost' => TRUE, // Check badhost
);
} else {
$bool = array();
}
// Remove non-$positive values
foreach (array_keys($positive) as $key) {
if ($positive[$key] < 0) unset($positive[$key]);
}
return $positive + $bool;
}
// Simple/fast spam check
function check_uri_spam($target = '', $method = array())
{
if (! is_array($method) || empty($method)) {
$method = check_uri_spam_method();
}
$progress = array(
'sum' => array(
'quantity' => 0,
'uniqhost' => 0,
'non_uniqhost'=> 0,
'non_uniquri' => 0,
'badhost' => 0,
'area_anchor' => 0,
'area_bbcode' => 0,
'uri_anchor' => 0,
'uri_bbcode' => 0,
),
'is_spam' => array(),
'method' => & $method,
'remains' => array(),
);
$sum = & $progress['sum'];
$is_spam = & $progress['is_spam'];
$remains = & $progress['remains'];
$asap = isset($method['asap']);
// Recurse
if (is_array($target)) {
foreach($target as $str) {
// Recurse
$_progress = check_uri_spam($str, $method);
$_sum = & $_progress['sum'];
$_is_spam = & $_progress['is_spam'];
$_remains = & $_progress['remains'];
foreach (array_keys($_sum) as $key) {
$sum[$key] += $_sum[$key];
}
foreach (array_keys($_is_spam) as $key) {
if (is_array($_is_spam[$key])) {
// Marge keys (badhost)
foreach(array_keys($_is_spam[$key]) as $_key) {
if (! isset($is_spam[$key][$_key])) {
$is_spam[$key][$_key] = $_is_spam[$key][$_key];
} else {
$is_spam[$key][$_key] += $_is_spam[$key][$_key];
}
}
} else {
$is_spam[$key] = TRUE;
}
}
foreach ($_remains as $key=>$value) {
foreach ($value as $_key=>$_value) {
if (is_int($_key)) {
$remains[$key][] = $_value;
} else {
$remains[$key][$_key] = $_value;
}
}
}
if ($asap && $is_spam) break;
}
return $progress;
}
// Area: There's HTML anchor tag
if ((! $asap || ! $is_spam) && isset($method['area_anchor'])) {
$key = 'area_anchor';
$_asap = isset($method['asap']) ? array('asap' => TRUE) : array();
$result = area_pickup($target, array($key => TRUE) + $_asap);
if ($result) {
$sum[$key] = $result[$key];
if (isset($method[$key]) && $sum[$key] > $method[$key]) {
$is_spam[$key] = TRUE;
}
}
}
// Area: There's 'BBCode' linking tag
if ((! $asap || ! $is_spam) && isset($method['area_bbcode'])) {
$key = 'area_bbcode';
$_asap = isset($method['asap']) ? array('asap' => TRUE) : array();
$result = area_pickup($target, array($key => TRUE) + $_asap);
if ($result) {
$sum[$key] = $result[$key];
if (isset($method[$key]) && $sum[$key] > $method[$key]) {
$is_spam[$key] = TRUE;
}
}
}
// Return if ...
if ($asap && $is_spam) return $progress;
// URI: Pickup
$pickups = spam_uri_pickup($target, $method);
//$remains['uri_pickup'] = & $pickups;
// Return if ...
if (empty($pickups)) return $progress;
// URI: Check quantity
$sum['quantity'] += count($pickups);
// URI quantity
if ((! $asap || ! $is_spam) && isset($method['quantity']) &&
$sum['quantity'] > $method['quantity']) {
$is_spam['quantity'] = TRUE;
}
// URI: used inside HTML anchor tag pair
if ((! $asap || ! $is_spam) && isset($method['uri_anchor'])) {
$key = 'uri_anchor';
foreach($pickups as $pickup) {
if (isset($pickup['area'][$key])) {
$sum[$key] += $pickup['area'][$key];
if(isset($method[$key]) &&
$sum[$key] > $method[$key]) {
$is_spam[$key] = TRUE;
if ($asap && $is_spam) break;
}
if ($asap && $is_spam) break;
}
}
}
// URI: used inside 'BBCode' pair
if ((! $asap || ! $is_spam) && isset($method['uri_bbcode'])) {
$key = 'uri_bbcode';
foreach($pickups as $pickup) {
if (isset($pickup['area'][$key])) {
$sum[$key] += $pickup['area'][$key];
if(isset($method[$key]) &&
$sum[$key] > $method[$key]) {
$is_spam[$key] = TRUE;
if ($asap && $is_spam) break;
}
if ($asap && $is_spam) break;
}
}
}
// URI: Uniqueness (and removing non-uniques)
if ((! $asap || ! $is_spam) && isset($method['non_uniquri'])) {
// Destructive normalize of URIs
uri_array_normalize($pickups);
$uris = array();
foreach (array_keys($pickups) as $key) {
$uris[$key] = uri_array_implode($pickups[$key]);
}
$count = count($uris);
$uris = array_unique($uris);
$sum['non_uniquri'] += $count - count($uris);
if ($sum['non_uniquri'] > $method['non_uniquri']) {
$is_spam['non_uniquri'] = TRUE;
}
if (! $asap || ! $is_spam) {
foreach (array_diff(array_keys($pickups),
array_keys($uris)) as $remove) {
unset($pickups[$remove]);
}
}
unset($uris);
}
// Return if ...
if ($asap && $is_spam) return $progress;
// Host: Uniqueness (uniq / non-uniq)
$hosts = array();
foreach ($pickups as $pickup) $hosts[] = & $pickup['host'];
$hosts = array_unique($hosts);
//$remains['uniqhost'] = & $hosts;
$sum['uniqhost'] += count($hosts);
if ((! $asap || ! $is_spam) && isset($method['non_uniqhost'])) {
$sum['non_uniqhost'] = $sum['quantity'] - $sum['uniqhost'];
if ($sum['non_uniqhost'] > $method['non_uniqhost']) {
$is_spam['non_uniqhost'] = TRUE;
}
}
// Return if ...
if ($asap && $is_spam) return $progress;
// URI: Bad host
if ((! $asap || ! $is_spam) && isset($method['badhost'])) {
$__remains = array();
if ($asap) {
$badhost = is_badhost($hosts, $asap, $__remains);
} else {
$badhost = is_badhost($hosts, $asap, $__remains);
if ($__remains) {
$remains['badhost'] = array();
foreach ($__remains as $value) {
$remains['badhost'][$value] = TRUE;
}
}
}
unset($__remains);
if (! empty($badhost)) {
$sum['badhost'] += array_count_leaves($badhost);
foreach(array_keys($badhost) as $keys) {
$is_spam['badhost'][$keys] =
array_count_leaves($badhost[$keys]);
}
unset($badhost);
}
}
return $progress;
}
// Count leaves
function array_count_leaves($array = array(), $count_empty_array = FALSE)
{
if (! is_array($array) || (empty($array) && $count_empty_array))
return 1;
// Recurse
$result = 0;
foreach ($array as $part) {
$result += array_count_leaves($part, $count_empty_array);
}
return $result;
}
// ---------------------
// Reporting
// TODO: Don't show unused $method!
// Summarize $progress (blocked only)
function summarize_spam_progress($progress = array(), $blockedonly = FALSE)
{
if ($blockedonly) {
$tmp = array_keys($progress['is_spam']);
} else {
$tmp = array();
$method = & $progress['method'];
if (isset($progress['sum'])) {
foreach ($progress['sum'] as $key => $value) {
if (isset($method[$key])) {
$tmp[] = $key . '(' . $value . ')';
}
}
}
}
return implode(', ', $tmp);
}
// ---------------------
// Exit
// Common bahavior for blocking
// NOTE: Call this function from various blocking feature, to disgueise the reason 'why blocked'
function spam_exit($mode = '', $data = array())
{
switch ($mode) {
case '': echo("\n"); break;
case 'dump':
echo('' . "\n");
echo htmlspecialchars(var_export($data, TRUE));
echo('' . "\n");
break;
};
// Force exit
exit;
}
// ---------------------
// Simple filtering
// TODO: Record them
// Simple/fast spam filter ($target: 'a string' or an array())
function pkwk_spamfilter($action, $page, $target = array('title' => ''), $method = array(), $exitmode = '')
{
$progress = check_uri_spam($target, $method);
if (! empty($progress['is_spam'])) {
// Mail to administrator(s)
pkwk_spamnotify($action, $page, $target, $progress, $method);
// Exit
spam_exit($exitmode, $progress);
}
}
// ---------------------
// PukiWiki original
// Mail to administrator(s)
function pkwk_spamnotify($action, $page, $target = array('title' => ''), $progress = array(), $method = array())
{
global $notify, $notify_subject;
if (! $notify) return;
$asap = isset($method['asap']);
$summary['ACTION'] = 'Blocked by: ' . summarize_spam_progress($progress, TRUE);
if (! $asap) {
$summary['METRICS'] = summarize_spam_progress($progress);
}
if (isset($progress['is_spam']['badhost'])) {
$badhost = array();
foreach($progress['is_spam']['badhost'] as $glob=>$number) {
$badhost[] = $glob . '(' . $number . ')';
}
$summary['DETAIL_BADHOST'] = implode(', ', $badhost);
}
if (! $asap && $progress['remains']['badhost']) {
$count = count($progress['remains']['badhost']);
$summary['DETAIL_NEUTRAL_HOST'] = $count .
' (' .
preg_replace(
'/[^, a-z0-9.-]/i', '',
implode(', ', array_keys($progress['remains']['badhost']))
) .
')';
}
$summary['COMMENT'] = $action;
$summary['PAGE'] = '[blocked] ' . (is_pagename($page) ? $page : '');
$summary['URI'] = get_script_uri() . '?' . rawurlencode($page);
$summary['USER_AGENT'] = TRUE;
$summary['REMOTE_ADDR'] = TRUE;
pkwk_mail_notify($notify_subject, var_export($target, TRUE), $summary, TRUE);
}
?>