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<?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);
?>
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