ddns.php: set reverse records, too

1 files changed, 26 insertions, 0 deletions

diff --git a/ddns.php b/ddns.php
index 31b8706..cb69235 100644
--- a/ddns.php
+++ b/ddns.php
@@ -13,6 +13,16 @@
     return '120';
   };
 
+  function reverse_entry($addr) {
+    $addrTeile = explode('.', $addr);
+    return $addrTeile[3].'.'.$addrTeile[2].'.'.$addrTeile[1].'.'.$addrTeile[0].'.in-addr.arpa.';
+  };
+
+  function reverse_zone($addr) {
+    $addrTeile = explode('.', $addr);
+    return $addrTeile[2].'.'.$addrTeile[1].'.'.$addrTeile[0].'.in-addr.arpa.';
+  };
+
   // invalid syntax?
   if ((!array_key_exists('i', $_GET)) ||
       (strlen($_GET['i']) != 64) ||
@@ -110,6 +120,22 @@
   }
   $updateCommand .=
     "send\n";
+  foreach ($ips as $i => $ip) {
+    if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
+      $reverse_entry = reverse_entry($ip);
+      $updateCommand .=
+        "zone ".reverse_zone($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
   $pin = popen('nsupdate -l', 'w');