X-Git-Url: http://git.harvie.cz/?a=blobdiff_plain;f=php%2Fipv6wildcard.php;h=458b3b3e61b0fb195c038210320f154257c8a738;hb=f6f4142a4b59346ccb7d5f63bd1173fdd13a713d;hp=15c3ad588861c5641f92c241e7b253a3ebfaa4d1;hpb=85bedcf1a82b8f35ec66de1960b618f554d74181;p=mirrors%2FPrograms.git

diff --git a/php/ipv6wildcard.php b/php/ipv6wildcard.php
old mode 100644
new mode 100755
index 15c3ad5..458b3b3
--- a/php/ipv6wildcard.php
+++ b/php/ipv6wildcard.php
@@ -1,10 +1,15 @@
+#!/usr/bin/php
 <?php
 
 /**
+ * (c) 2020 - Tomas Mudrunka <harvie@github>
+ *
  * Given IPv6 address and prefix creates array of * wildcard suffixed
  * addresses to be used for as reverse DNS records
  */
 function ipv6_prefix2wildcards($address, $prefix) {
+	//Special case of /0 prefix
+	if($prefix == 0) return ['*'];
 
 	//Parse ip and prefix
 	echo("IPv6 prefix: ".$address."/".$prefix."\n");
@@ -13,9 +18,10 @@ function ipv6_prefix2wildcards($address, $prefix) {
 	$a = gmp_import($addr);
 
 	//Separate maskable octets
-	$pref_hex = ceil($pref / 4)*4; //Prefix rounded up to full octets
-	$pref_rem = $pref_hex - $pref; //Remainder of prefix
-	echo("Rounding prefix: ".$pref_hex."-".$pref_rem."\n");
+	$pref_hex = ceil($pref / 4); //Number of prefix octets
+	$pref_bin = $pref_hex*4; //Number of prefix octets in bits
+	$pref_rem = $pref_bin - $pref; //Remainder of prefix
+	echo("Rounding prefix: ".$pref_bin."-".$pref_rem."\n");
 
 	$a = gmp_div_q($a, gmp_pow(2,128-$prefix)); //Truncate to just prefix
 	$a = gmp_mul($a, gmp_pow(2,$pref_rem)); //Fill remaining bits in last wildcard octet with zeros
@@ -25,12 +31,19 @@ function ipv6_prefix2wildcards($address, $prefix) {
 	for($i = 0; $i < (2**$pref_rem) ; $i++) {
 		//echo("ADDED: ".$i." = ".decbin($i)."\n");
 		$ap = gmp_or($a, gmp_init($i));
-		$wildcards[] = $ap;
+		$w = gmp_strval($ap, 16);
+		$w = str_repeat('0', $pref_hex-strlen($w)).$w;
+		if(strlen($w) < 32) $w.='*';
+		$wildcards[] = $w;
 	}
 
 	return $wildcards;
 }
 
+function ipv6_string2rev($str) {
+	return implode('.',str_split(strrev($str)));
+}
+
 if(isset($argv[2])) {
 	$wcs = ipv6_prefix2wildcards($argv[1],$argv[2]);
 } else {
@@ -39,6 +52,10 @@ if(isset($argv[2])) {
 
 echo("\n");
 foreach($wcs as $w) {
-  //echo(gmp_strval($w, 2)."* :-)\n");
-  echo(gmp_strval($w, 16)."*\n");
+	echo($w."\n");
+}
+
+echo("\n");
+foreach($wcs as $w) {
+	echo(ipv6_string2rev($w)."\n");
 }