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authorSimon Rettberg2019-12-10 15:21:00 +0100
committerSimon Rettberg2019-12-10 15:21:00 +0100
commit58a12c414cdf55881816fba79c277c7a00e9f78d (patch)
treef4d0c3ef89872ceb0408c39342e55c01e6b3e659
parent[rebootcontrol] cron: Test jumphost availability (diff)
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[inc/IpUtil] Add missing class
-rw-r--r--inc/iputil.inc.php72
1 files changed, 72 insertions, 0 deletions
diff --git a/inc/iputil.inc.php b/inc/iputil.inc.php
new file mode 100644
index 00000000..5cdd583c
--- /dev/null
+++ b/inc/iputil.inc.php
@@ -0,0 +1,72 @@
+<?php
+
+class IpUtil
+{
+
+ public static function rangeToCidr($start, $end)
+ {
+ $value = (int)$start ^ (int)$end;
+ if (!self::isAllOnes($value))
+ return 'NOT SUBNET: ' . long2ip($start) . '-' . long2ip($end);
+ $ones = self::countOnes($value);
+ return long2ip($start) . '/' . (32 - $ones);
+ }
+
+ public static function isValidSubnetRange($start, $end)
+ {
+ return self::isAllOnes((int)$start ^ (int)$end);
+ }
+
+ /**
+ * Return number of one bits required to represent
+ * this number. Assumes given number is 2^n - 1.
+ */
+ private static function countOnes($value)
+ {
+ // This is log(value) / log(2)
+ // It should actually be $value + 1, but floating point errors
+ // start to happen either way at higher values, so with
+ // the round() thrown in, it doesn't matter...
+ return round(log($value) / 0.69314718055995);
+ }
+
+ /**
+ * Is the given number just ones if converted to
+ * binary (ignoring leading zeros)?
+ */
+ private static function isAllOnes($value)
+ {
+ return ($value & ($value + 1)) === 0;
+ }
+
+ /**
+ * Parse network range in CIDR notion, return
+ * ['start' => (int), 'end' => (int)] representing
+ * the according start and end addresses as integer
+ * values. Returns false on malformed input.
+ * @param string $cidr 192.168.101/24, 1.2.3.4/16, ...
+ * @return array|false start and end address, false on error
+ */
+ public static function parseCidr($cidr)
+ {
+ $parts = explode('/', $cidr);
+ if (count($parts) !== 2)
+ return false;
+ $ip = $parts[0];
+ $bits = $parts[1];
+ if (!is_numeric($bits) || $bits < 0 || $bits > 32)
+ return false;
+ $dots = substr_count($ip, '.');
+ if ($dots < 3) {
+ $ip .= str_repeat('.0', 3 - $dots);
+ }
+ $ip = ip2long($ip);
+ if ($ip === false)
+ return false;
+ $bits = pow(2, 32 - $bits) - 1;
+ if (PHP_INT_SIZE === 4)
+ return ['start' => sprintf('%u', $ip & ~$bits), 'end' => sprintf('%u', $ip | $bits)];
+ return ['start' => $ip & ~$bits, 'end' => $ip | $bits];
+ }
+
+}