From 6311a56fc4d8ff33c5b39bba3bfdedb261cf3594 Mon Sep 17 00:00:00 2001
From: marcus <marcus@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Mon, 29 Sep 2008 15:03:51 +0000
Subject: Added IP address tools, todo check licence.

git-svn-id: https://code.elgg.org/elgg/trunk@2147 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 engine/lib/elgglib.php | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)

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.
-- 
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