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dnsproxy.php
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dnsproxy.php
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<?php
// Load Net/DNS2 library
if (file_exists('Net.phar')) {
require_once 'phar://Net.phar/DNS2.php';
spl_autoload_unregister('Net_DNS2::autoload');
spl_autoload_register(function ($name) {
if (strncmp($name, 'Net_DNS2', 8) == 0)
require 'phar://Net.phar'.str_replace('_', '/', substr($name, 3)) . '.php';
});
} elseif (file_exists('Net/DNS2.php')) {
require_once 'Net/DNS2.php';
} else {
output_error('Net_DNS2 PHP library is missing.');
}
//////////////////// Helper funcions ////////////////////
function output_error($error_string, $status_code = 500) {
http_response_code($status_code);
die($error_string);
}
function output($data) {
header('Content-Type: application/json');
die(json_encode($data));
}
function resolve($r, $name, $type) {
try {
$data = $r->query($name, $type);
} catch(Net_DNS2_Exception $e) {
output_error($e->getMessage());
}
return $data;
}
//////////////////// Request handlers ////////////////////
function supported_key_types() {
output(array_reverse(Net_DNS2_RR_TSIG::$hash_algorithms));
}
function supported_rr_types() {
$types = array();
foreach (Net_DNS2_Lookups::$rr_types_id_to_class as $val) {
$tmp = explode('_', $val);
$types[$tmp[3]] = $tmp[3];
}
output($types);
}
function zone_to_server($args) {
foreach (array("zone") as $val)
if (empty($args[$val]))
output_error('Invalid request, "'.$val.'" field is mandatory.', 400);
$r = new Net_DNS2_Resolver();
$data = resolve($r, $args['zone'], 'NS');
$ns_list = array_map(function ($r) {return $r->nsdname;}, $data->answer);
if (empty($ns_list))
output_error('No NS records for zone "'.$args['zone'].'"');
sort($ns_list);
$data = resolve($r, $ns_list[0], "A");
$a_list = array_map(function ($r) {return $r->address;}, $data->answer);
output(array("server" => $a_list[0]));
}
function add_record($args) {
foreach (array("zone", "key-name", "key-type", "key", "server", "record") as $val)
if (empty($args[$val]))
output_error('Invalid request, "'.$val.'" field is mandatory.', 400);
$record = $args['record'];
foreach (array("name", "ttl", "type", "data") as $val)
if (empty($record[$val]))
output_error('Invalid request, "'.$val.'" field is mandatory.', 400);
$type_name = $record['type'];
if (empty(Net_DNS2_Lookups::$rr_types_by_name[$type_name]))
output_error('Resource record type "'.$type_name.'" is not supported.');
$type_id = Net_DNS2_Lookups::$rr_types_by_name[$type_name];
if (empty(Net_DNS2_Lookups::$rr_types_id_to_class[$type_id]))
output_error('Resource record type "'.$type_name.'" is not supported.');
$type_class = Net_DNS2_Lookups::$rr_types_id_to_class[$type_id];
$u = new Net_DNS2_Updater($args['zone'], array('nameservers' => array($args['server'])));
try {
$u->signTSIG($args['key-name'], $args['key'], $args['key-type']);
$u->add($type_class::fromString($record['name'].' '.$record['ttl'].' IN '.$record['type'].' '.$record['data']));
$u->update();
} catch(Net_DNS2_Exception $e) {
return $e->getMessage();
}
return true;
}
function delete_record($args) {
foreach (array("zone", "key-name", "key-type", "key", "server", "record") as $val)
if (empty($args[$val]))
output_error('Invalid request, "'.$val.'" field is mandatory', 400);
$record = $args['record'];
foreach (array("name", "type", "data") as $val)
if (empty($record[$val]))
output_error('Invalid request, "'.$val.'" field is mandatory', 400);
$type_name = $record['type'];
if (empty(Net_DNS2_Lookups::$rr_types_by_name[$type_name]))
output_error('Resource record type "'.$type_name.'" is not supported.');
$type_id = Net_DNS2_Lookups::$rr_types_by_name[$type_name];
if (empty(Net_DNS2_Lookups::$rr_types_id_to_class[$type_id]))
output_error('Resource record type "'.$type_name.'" is not supported.');
$type_class = Net_DNS2_Lookups::$rr_types_id_to_class[$type_id];
$u = new Net_DNS2_Updater($args['zone'], array('nameservers' => array($args['server'])));
try {
$u->signTSIG($args['key-name'], $args['key'], $args['key-type']);
$u->delete($type_class::fromString($record['name'].' 0 NONE '.$record['type'].' '.$record['data']));
$u->update();
} catch(Net_DNS2_Exception $e) {
return $e->getMessage();
}
return true;
}
function axfr($args) {
foreach (array("zone", "key-name", "key-type", "key", "server") as $val)
if (empty($args[$val]))
output_error('Invalid request, "'.$val.'" field is mandatory', 400);
$r = new Net_DNS2_Resolver(array('nameservers' => array($args['server'])));
$r->signTSIG($args['key-name'], $args['key'], $args['key-type']);
$data = resolve($r, $args['zone'], 'AXFR');
$records = array_map(function ($r) {
return array(
'name' => $r->name,
'ttl' => $r->ttl,
'type' => $r->type,
'data' => implode(' ', array_slice(explode(' ', $r), 4))
);
}, $data->answer);
output(array("records" => $records));
}
//////////////////// Main code ////////////////////
if (isset($_SERVER['HTTP_ORIGIN'])) {
header('Access-Control-Allow-Origin: '.$_SERVER['HTTP_ORIGIN']);
header('Access-Control-Allow-Credentials: true');
header('Access-Control-Max-Age: 86400');
}
if ($_SERVER['REQUEST_METHOD'] != 'POST') {
header('Allow: POST');
output_error("Only POST method is allowed.", 405);
}
$args = json_decode(file_get_contents("php://input"), true);
switch ($_SERVER['PATH_INFO']) {
case '/ping':
output(array('response' => 'pong'));
break;
case '/supported-key-types':
supported_key_types();
break;
case '/supported-rr-types':
supported_rr_types();
break;
case '/zone-to-server':
zone_to_server($args);
break;
case '/axfr':
axfr($args);
break;
case '/delete-record':
$ret = delete_record($args);
if($ret !== true){
output_error($ret);
}
break;
case '/add-record':
$ret = add_record($args);
if($ret !== true){
output_error($ret);
}
break;
case '/update-record':
$original = $args['record']['original'];
$new = $args['record']['new'];
$args['record'] = $original;
// output_error(print_r($args));
$ret = delete_record($args);
if($ret !== true){
output_error($ret);
}
$args['record'] = $new;
$ret = add_record($args);
if($ret !== true){
$args['record'] = $original;
add_record($args);
output_error($ret);
}
break;
default:
output_error('Requested method is not available.', 501);
}