Protect IPv6 IPs in public moderation logs.

As reported, IPv6 addresses were not properly hidden in the public
facing moderation logs. This commit filters both IPv4 and IPv6
addresses.

inc/mod/pages.php

@@ -742,11 +742,13 @@ function mod_board_log($board, $page_no = 1, $hide_names = false, $public = fals
 		error($config['error']['404']);
 
 	if (!hasPermission($config['mod']['show_ip'])) {
-		// Supports ipv4 only!
+		$ipv4_regex = '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}';
+		$ipv6_regex = '(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))';
+
+		$ipv4_link_regex =  '/(?:<a href="\?\/IP\/'. $ipv4_regex . '">)?(' . $ipv4_regex . ')(?:<\/a>)?/';
+		$ipv6_link_regex =  '/(?:<a href="\?\/IP\/'. $ipv6_regex . '">)?(' . $ipv6_regex . ')(?:<\/a>)?/';
 		foreach ($logs as $i => &$log) {
-			$log['text'] = preg_replace_callback('/(?:<a href="\?\/IP\/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}">)?(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})(?:<\/a>)?/', function($matches) {
-				return "xxxx";//less_ip($matches[1]);
-			}, $log['text']);
+			$log['text'] = preg_replace(array($ipv4_link_regex, $ipv6_link_regex), "xxxx", $log['text']);
 		}
 	}