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-rw-r--r--engine/lib/elgglib.php94
1 files changed, 94 insertions, 0 deletions
diff --git a/engine/lib/elgglib.php b/engine/lib/elgglib.php
index 1562fd003..0d2b1e073 100644
--- a/engine/lib/elgglib.php
+++ b/engine/lib/elgglib.php
@@ -1647,6 +1647,100 @@
$port = ($_SERVER["SERVER_PORT"] == "80") ? "" : (":".$_SERVER["SERVER_PORT"]);
return $protocol . "://" . $_SERVER['SERVER_NAME'] . $port . $_SERVER['REQUEST_URI'];
}
+
+ /**
+ * Useful function found in the comments on the PHP man page for ip2long.
+ * Returns 1 if an IP matches a given range.
+ *
+ * TODO: Check licence... assuming this is PD since it was found several places on the interwebs..
+ * please check or rewrite.
+ *
+ * Matches:
+ * xxx.xxx.xxx.xxx (exact)
+ * xxx.xxx.xxx.[yyy-zzz] (range)
+ * xxx.xxx.xxx.xxx/nn (nn = # bits, cisco style -- i.e. /24 = class C)
+ * Does not match:
+ * xxx.xxx.xxx.xx[yyy-zzz] (range, partial octets not supported)
+ */
+ function test_ip($range, $ip)
+ {
+ $result = 1;
+
+ # IP Pattern Matcher
+ # J.Adams <jna@retina.net>
+ #
+ # Matches:
+ #
+ # xxx.xxx.xxx.xxx (exact)
+ # xxx.xxx.xxx.[yyy-zzz] (range)
+ # xxx.xxx.xxx.xxx/nn (nn = # bits, cisco style -- i.e. /24 = class C)
+ #
+ # Does not match:
+ # xxx.xxx.xxx.xx[yyy-zzz] (range, partial octets not supported)
+
+
+ if (ereg("([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)/([0-9]+)",$range,$regs)) {
+
+ # perform a mask match
+ $ipl = ip2long($ip);
+ $rangel = ip2long($regs[1] . "." . $regs[2] . "." . $regs[3] . "." . $regs[4]);
+
+ $maskl = 0;
+
+ for ($i = 0; $i< 31; $i++) {
+ if ($i < $regs[5]-1) {
+ $maskl = $maskl + pow(2,(30-$i));
+ }
+ }
+
+ if (($maskl & $rangel) == ($maskl & $ipl)) {
+ return 1;
+ } else {
+ return 0;
+ }
+ } else {
+
+ # range based
+ $maskocts = split("\.",$range);
+ $ipocts = split("\.",$ip);
+
+ # perform a range match
+ for ($i=0; $i<4; $i++) {
+ if (ereg("\[([0-9]+)\-([0-9]+)\]",$maskocts[$i],$regs)) {
+ if ( ($ipocts[$i] > $regs[2]) || ($ipocts[$i] < $regs[1])) {
+ $result = 0;
+ }
+ }
+ else
+ {
+ if ($maskocts[$i] <> $ipocts[$i]) {
+ $result = 0;
+ }
+ }
+ }
+ }
+ return $result;
+ }
+
+ /**
+ * Match an IP address against a number of ip addresses or ranges, returning true if found.
+ *
+ * @param array $networks
+ * @param string $ip
+ * @return bool
+ */
+ function is_ip_in_array(array $networks, $ip)
+ {
+ global $SYSTEM_LOG;
+
+ foreach ($networks as $network)
+ {
+ if (test_ip(trim($network), $ip))
+ return true;
+ }
+
+ return false;
+ }
/**
* An interface for objects that behave as elements within a social network that have a profile.