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-rwxr-xr-xsystem/core/Input.php134
1 files changed, 131 insertions, 3 deletions
diff --git a/system/core/Input.php b/system/core/Input.php
index 9bfb5f1fb..4b7622cbe 100755
--- a/system/core/Input.php
+++ b/system/core/Input.php
@@ -365,13 +365,66 @@ class CI_Input {
/**
* Validate IP Address
*
+ * @access public
+ * @param string
+ * @param string ipv4 or ipv6
+ * @return bool
+ */
+ public function valid_ip($ip, $which = '')
+ {
+ $which = strtolower($which);
+
+ // First check if filter_var is available
+ if (is_callable('filter_var'))
+ {
+ switch ($which) {
+ case 'ipv4':
+ $flag = FILTER_FLAG_IPV4;
+ break;
+ case 'ipv6':
+ $flag = FILTER_FLAG_IPV6;
+ break;
+ default:
+ $flag = '';
+ break;
+ }
+
+ return filter_var($ip, FILTER_VALIDATE_IP, $flag) !== FALSE;
+ }
+
+ // If it's not we'll do it manually
+ if ($which != 'ipv6' OR $which != 'ipv4')
+ {
+ if (strpos($ip, ':') !== FALSE)
+ {
+ $which = 'ipv6';
+ }
+ elseif (strpos($ip, '.') !== FALSE)
+ {
+ $which = 'ipv4';
+ }
+ else
+ {
+ return FALSE;
+ }
+ }
+
+ $func = '_valid_'.$which;
+ return $this->$func($ip);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Validate IPv4 Address
+ *
* Updated version suggested by Geert De Deckere
*
- * @access public
+ * @access protected
* @param string
- * @return string
+ * @return bool
*/
- function valid_ip($ip)
+ protected function _valid_ipv4($ip)
{
$ip_segments = explode('.', $ip);
@@ -385,6 +438,7 @@ class CI_Input {
{
return FALSE;
}
+
// Check each segment
foreach ($ip_segments as $segment)
{
@@ -398,6 +452,80 @@ class CI_Input {
return TRUE;
}
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Validate IPv6 Address
+ *
+ * @access protected
+ * @param string
+ * @return bool
+ */
+ protected function _valid_ipv6($str)
+ {
+ // 8 groups, separated by :
+ // 0-ffff per group
+ // one set of consecutive 0 groups can be collapsed to ::
+
+ $groups = 8;
+ $collapsed = FALSE;
+
+ $chunks = array_filter(
+ preg_split('/(:{1,2})/', $str, NULL, PREG_SPLIT_DELIM_CAPTURE)
+ );
+
+ // Rule out easy nonsense
+ if (current($chunks) == ':' OR end($chunks) == ':')
+ {
+ return FALSE;
+ }
+
+ // PHP supports IPv4-mapped IPv6 addresses, so we'll expect those as well
+ if (strpos(end($chunks), '.') !== FALSE)
+ {
+ $ipv4 = array_pop($chunks);
+
+ if ( ! $this->_valid_ipv4($ipv4))
+ {
+ return FALSE;
+ }
+
+ $groups--;
+ }
+
+ while ($seg = array_pop($chunks))
+ {
+ if ($seg[0] == ':')
+ {
+ if (--$groups == 0)
+ {
+ return FALSE; // too many groups
+ }
+
+ if (strlen($seg) > 2)
+ {
+ return FALSE; // long separator
+ }
+
+ if ($seg == '::')
+ {
+ if ($collapsed)
+ {
+ return FALSE; // multiple collapsed
+ }
+
+ $collapsed = TRUE;
+ }
+ }
+ elseif (preg_match("/[^0-9a-f]/i", $seg) OR strlen($seg) > 4)
+ {
+ return FALSE; // invalid segment
+ }
+ }
+
+ return $collapsed OR $groups == 1;
+ }
// --------------------------------------------------------------------