ddns.php: set up reverse entries for ipv6, too

1 files changed, 65 insertions, 35 deletions

diff --git a/ddns.php b/ddns.php
index 3b8793c..b9ce90e 100644
--- a/ddns.php
+++ b/ddns.php
@@ -5,31 +5,65 @@
 // $x.ddns.eckner.net (all)
 
   function lifetime($addr) {
-    $addrTeile = explode('.', $addr);
-    if (($addrTeile[0] == '10') ||
-       (($addrTeile[0] == '192') && ($addrTeile[1] == '168')) ||
-       (($addrTeile[0] == '172') && ($addrTeile[1] >= 16) && ($addrTeile[1] < 32)))
-      return '7200';
+    if (filter_var($addr, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
+      $addrTeile = explode('.', $addr);
+      if (($addrTeile[0] == '10') ||
+         (($addrTeile[0] == '192') && ($addrTeile[1] == '168')) ||
+         (($addrTeile[0] == '172') && ($addrTeile[1] >= 16) && ($addrTeile[1] < 32)))
+        return '7200';
+    };
     return '120';
   };
 
+  function convert_ipv6_address_part_to_reverse_record_part(&$part) {
+    while (strlen($part)<4)
+      $part = '0' . $part;
+    $part = str_split($part);
+    $part = array_reverse($part);
+    $part = implode('.', $part);
+  };
+
+  function reverse_ipv6_address($addr) {
+    $addr_Teile = array();
+    while (count($addr_Teile) < 8) {
+      $addr_Teile = explode(':', $addr);
+      $addr = str_replace('::',':0::',$addr);
+    }
+    array_walk($addr_Teile, 'convert_ipv6_address_part_to_reverse_record_part');
+    $addr_Teile = array_reverse($addr_Teile);
+    return implode('.', $addr_Teile);
+  };
+
   function reverse_entry($addr) {
-    $addrTeile = explode('.', $addr);
-    $lp = array_pop($addrTeile);
-    $subNet = implode('.', $addrTeile);
-    array_push($addrTeile, $lp);
-    array_reverse($addrTeile);
-    if (($subNet == '10.0.2') ||
-        ($subNet == '192.168.0') ||
-        ($subNet == '192.168.1'))
-      return implode('.',$addrTeile).'.in-addr.arpa.';
+    if (filter_var($addr, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
+      $addrTeile = explode('.', $addr);
+      $lp = array_pop($addrTeile);
+      $subNet = implode('.', $addrTeile);
+      array_push($addrTeile, $lp);
+      array_reverse($addrTeile);
+      if (($subNet == '10.0.2') ||
+          ($subNet == '192.168.0') ||
+          ($subNet == '192.168.1'))
+        return implode('.',$addrTeile).'.in-addr.arpa.';
+    } elseif (filter_var($addr, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
+      $reversed_address = reverse_ipv6_address($addr);
+      if (stripos(implode('.',array_reverse(explode('.',$reversed_address))),'2.a.0.1.0.0.d.0.f.6.c.e.')===0)
+        return $reversed_address.'.ip6.arpa.';
+    };
     return NULL;
   };
 
   function reverse_zone($addr) {
-    $addrTeile = explode('.', $addr);
-    array_pop($addrTeile);
-    return implode('.',$addrTeile).'.in-addr.arpa.';
+    if (filter_var($addr, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
+      $addrTeile = explode('.', $addr);
+      array_pop($addrTeile);
+      return implode('.',$addrTeile).'.in-addr.arpa.';
+    } elseif (filter_var($addr, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
+      $reversed_address = reverse_ipv6_address($addr);
+      if (stripos(implode('.',array_reverse(explode('.',$reversed_address))),'2.a.0.1.0.0.d.0.f.6.c.e.')===0)
+        return 'e.c.6.f.0.d.0.0.1.0.a.2.ip6.arpa.';
+    };
+    return NULL;
   };
 
   // invalid syntax?
@@ -140,22 +174,20 @@
   $updateCommand .=
     "send\n";
   foreach ($ips as $i => $ip) {
-    if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
-      $reverse_entry = reverse_entry($ip);
-      if (!$reverse_entry)
-        continue;
-      $updateCommand .=
-        "zone ".reverse_zone($ip)."\n";
-      // delete old record if existing
-      $updateCommand .=
-        "prereq yxrrset " . $reverse_entry . " IN PTR\n" .
-        "update delete " . $reverse_entry . " IN PTR\n" .
-        "send\n";
-      // set new records no matter what
-      $updateCommand .=
-        "update add " . $reverse_entry . " " . lifetime($ip) . " IN PTR " . $domain . ".ddns.eckner.net.\n" .
-        "send\n";
-    }
+    $reverse_entry = reverse_entry($ip);
+    if (!$reverse_entry)
+      continue;
+    $updateCommand .=
+      "zone ".reverse_zone($ip)."\n";
+    // delete old record if existing
+    $updateCommand .=
+      "prereq yxrrset " . $reverse_entry . " IN PTR\n" .
+      "update delete " . $reverse_entry . " IN PTR\n" .
+      "send\n";
+    // set new records no matter what
+    $updateCommand .=
+      "update add " . $reverse_entry . " " . lifetime($ip) . " IN PTR " . $domain . ".ddns.eckner.net.\n" .
+      "send\n";
   }
 
   // actually do something
@@ -167,8 +199,6 @@
 
   pclose($pin);
 
-echo $updateCommand;
-
   file_put_contents('/srv/http/vhosts/eckner.net/ddns/log', $logContent, FILE_APPEND | LOCK_EX);
 
   print "updated ips for domain \"" . $domain . ".ddns.eckner.net\": " . implode($ips,", ") . "\n";