Initial commit

1 files changed, 89 insertions, 0 deletions

diff --git a/ddns.php b/ddns.php
new file mode 100644
index 0000000..8ce064c
--- /dev/null
+++ b/ddns.php
@@ -0,0 +1,89 @@
+<?php
+
+  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";
+    return "120";
+  };
+
+  // invalid syntax?
+  if ((!array_key_exists('i',$_GET)) ||
+      (strlen($_GET["i"])!=64) ||
+      (preg_match("@^[0-9A-Za-z]{64}$@",$_GET["i"])!=1))
+    die();
+
+  $line=preg_grep("@^".$_GET["i"]." @", file("/srv/http/vhosts/eckner.net/ddns/tokens"));
+
+  // unknown token?
+  if (count($line)!=1)
+    die();
+
+  $domain=substr(explode(" ",implode("",$line))[1],0,-1);
+  if (isset($_GET["address"]))
+    $ips=explode(",",$_GET["address"]);
+  else
+    $ips[0]="auto";
+
+  foreach ($ips as $i => $ip)
+    if ($ip == "auto")
+      $ips[$i]=$_SERVER["REMOTE_ADDR"];
+
+  $ips=array_unique($ips);
+
+  unset($hasRrType);
+
+  foreach ($ips as $i => $ip) {
+    if (filter_var($ip,FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
+      $rrTypes[$i]="A";
+      $hasRrType["A"]=1;
+    }
+    elseif (filter_var($ip,FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
+      $rrTypes[$i]="AAAA";
+      $hasRrType["AAAA"]=1;
+    }
+    else
+      die();
+  }
+
+  $updateCommand="";
+  $logContent="";
+
+  foreach ($hasRrType as $rrType => $dummy) {
+    // delete old record if existing
+    $updateCommand=
+      $updateCommand.
+      "zone ddns.eckner.net.\n".
+      "prereq yxrrset ".$domain.".ddns.eckner.net IN ".$rrType."\n".
+      "update delete ".$domain.".ddns.eckner.net IN ".$rrType."\n".
+      "send\n".
+      "zone ddns.eckner.net.\n";
+    // set new records no matter what
+    foreach ($ips as $i => $ip)
+      if ($rrTypes[$i] == $rrType) {
+        $updateCommand=
+          $updateCommand.
+          "update add ".$domain.".ddns.eckner.net. ".lifetime($ip)." IN ".$rrType." ".$ip."\n";
+        $logContent=
+          $logContent.
+          date("Y-m-d H:i:s")." ".$domain." ".$ip."\n";
+      }
+    $updateCommand=
+      $updateCommand.
+    "send\n";
+  }
+
+  // actually do something
+  $pin=popen("nsupdate -l","w");
+  if ($pin === FALSE)
+    die();
+
+  fwrite($pin,$updateCommand);
+
+  pclose($pin);
+
+  file_put_contents("/srv/http/vhosts/eckner.net/ddns/log", $logContent, FILE_APPEND | LOCK_EX);
+
+?>