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<?php
// $filter = array(v4, v6, file('/srv/http/vhosts/eckner.net/ddns/ip-filters'))
// $x \in array($token, $token.$filter foreach $filter with match):
// $x.ddns.eckner.net (all)
function lifetime($addr) {
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) {
if (filter_var($addr, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
$addrTeile = explode('.', $addr);
$lp = array_pop($addrTeile);
$subNet = implode('.', $addrTeile);
array_push($addrTeile, $lp);
$addrTeile = array_reverse($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) {
if (filter_var($addr, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
$addrTeile = explode('.', $addr);
array_pop($addrTeile);
$addrTeile = array_reverse($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?
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 (array_key_exists('address', $_GET))
$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);
$hasRrType = array();
$rrTypes = array();
$filterMatches = array();
$filters = array();
foreach (file('/srv/http/vhosts/eckner.net/ddns/ip-filters') as $filterLine) {
if (substr($filterLine, 0, 1) == '#')
continue;
$filter = explode(' ', $filterLine);
if (count($filter) < 2)
continue;
$filters[] = array(
'name' => $filter[0],
'regex' => substr($filter[1], 0, -1)
);
}
foreach ($ips as $i => $ip) {
$filterMatches[$i] = array();
if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
$rrTypes[$i] = 'A';
$hasRrType['A'] = 1;
$filterMatches[$i][] = 'v4';
}
elseif (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
$rrTypes[$i] = 'AAAA';
$hasRrType['AAAA'] = 1;
$filterMatches[$i][] = 'v6';
}
else
die();
foreach ($filters as $filter) {
if (preg_match('@' . $filter['regex'] . '@', $ip) == 1)
$filterMatches[$i][] = $filter['name'];
else
$filterMatches[$i][] = 'non-' . $filter['name'];
}
$filterMatches[$i] = array_unique($filterMatches[$i]);
}
$updateCommand = "zone ddns.eckner.net.\n";
$logContent = '';
foreach ($hasRrType as $rrType => $dummy) {
// delete old record if existing
$updateCommand .=
"prereq yxrrset " . $domain . ".ddns.eckner.net IN " . $rrType . "\n" .
"update delete " . $domain . ".ddns.eckner.net IN " . $rrType . "\n" .
"send\n";
if ($rrType == 'A')
$updateCommand .=
"prereq yxrrset " . $domain . ".v4.ddns.eckner.net IN " . $rrType . "\n" .
"update delete " . $domain . ".v4.ddns.eckner.net IN " . $rrType . "\n" .
"send\n";
else
$updateCommand .=
"prereq yxrrset " . $domain . ".v6.ddns.eckner.net IN " . $rrType . "\n" .
"update delete " . $domain . ".v6.ddns.eckner.net IN " . $rrType . "\n" .
"send\n";
foreach ($filters as $filter) {
foreach (array('', 'non-') as $filter_prefix) {
$updateCommand .=
"prereq yxrrset " . $domain . "." . $filter_prefix . $filter['name'] . ".ddns.eckner.net IN " . $rrType . "\n" .
"update delete " . $domain . "." . $filter_prefix . $filter['name'] . ".ddns.eckner.net IN " . $rrType . "\n" .
"send\n";
}
}
}
// set new records no matter what
foreach ($ips as $i => $ip) {
$updateCommand .=
"update add " . $domain . ".ddns.eckner.net. " . lifetime($ip) . " IN " . $rrTypes[$i] . " " . $ip . "\n";
$logContent .=
date('Y-m-d H:i:s') . ' ' . $domain . ' ' . $ip . "\n";
foreach ($filterMatches[$i] as $filter) {
$updateCommand .=
"update add " . $domain . "." . $filter . ".ddns.eckner.net. " . lifetime($ip) . " IN " . $rrTypes[$i] . " " . $ip . "\n";
$logContent .=
date('Y-m-d H:i:s') . ' ' . $domain . '.' . $filter . ' ' . $ip . "\n";
}
}
$updateCommand .=
"send\n";
foreach ($ips as $i => $ip) {
$reverse_entry = reverse_entry($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
$pin = popen('nsupdate -l', 'w');
if ($pin === FALSE)
die();
fwrite($pin, $updateCommand);
pclose($pin);
file_put_contents('/srv/http/vhosts/eckner.net/ddns/log', $logContent, FILE_APPEND | LOCK_EX);
print "updated ips for domain \"" . $domain . ".ddns.eckner.net\": " . implode($ips,", ") . "\n";
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