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Excellent script! #1

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Excellent script! #1

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d231566
Can use remote DNS server. Impl param defaults and machine-readable r…
wqweto Apr 4, 2012
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wqweto Apr 4, 2012
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109 changes: 63 additions & 46 deletions index.php
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Original file line number Diff line number Diff line change
Expand Up @@ -4,38 +4,59 @@
#
# (c) Karl-Martin Skontorp <kms@skontorp.net> ~ http://22pf.org/
# Licensed under the GNU GPL 2.0 or later.
#
# 2012-04-04 Vlad Vissoultchev <wqweto@gmail.com>
# - Supports local and remote DNS servers
# - Implemented defaults on every parameter
# - Output mimics http://dyn.com/support/developers/api/return-codes/
#

header("Content-Type: text/plain");

// Config
$nsupdate = '/usr/bin/nsupdate -v';
$cacheDir = 'cache';
$dnsServer = '127.0.0.1';
$cacheDir = '/tmp/nsupdate-cache'; // chmod 777 this
$default = array(
'ip' => $_SERVER['REMOTE_ADDR'],
'ttl' => 60,
'key' => 'ddns-key abcdef123456789=',
);

// GET/POST parameters
$config['hostname'] = $_REQUEST['hostname'];
$config['key'] = $_REQUEST['key'];
$config['ttl'] = $_REQUEST['ttl'];
$config['ip'] = $_REQUEST['ip'];

// Default IP is remote host address
if (empty($config['ip'])) {
$config['ip'] = $_SERVER['REMOTE_ADDR'];
}
$config = array(
'hostname' => $_REQUEST['hostname'],
'key' => $_REQUEST['key'],
'ttl' => $_REQUEST['ttl'],
'ip' => $_REQUEST['ip'],
);

// Handling of missing parameters
$error = false;
$error |= empty($config['hostname']);
$error |= empty($config['key']);
$error |= empty($config['ttl']);
$error |= empty($config['ip']);

if ($_REQUEST['debug'] == 'yes' || $error) {
echo "nsupdate web-interface\n";
echo "----------------------\n\n";
echo "Error: Missing parameters\n\n";
$error = 0;
foreach ($config as $k => $v) {
$error |= empty($v) && empty($default[$k]);
}

if (empty($config['hostname']) && empty($default['hostname'])) {
echo "nohost\n";
exit;
}
elseif ($error) {
echo "911\n";
echo "Error: Missing parameters with no defaults\n\n";
print_r($config);
exit;
}
elseif (isset($_REQUEST['debug'])) {
print_r($config);
exit;
}

// Default params
foreach ($config as $k => $v) {
if (empty($v))
$config[$k] = $default[$k];
}

// Handle cache of old/current IP address
$cacheFile = $cacheDir . '/' . basename($config['hostname']);
Expand All @@ -46,15 +67,15 @@

// Exit now unless IP address is new
if ($config['old_ip'] == $config['ip']) {
echo 'nochg ' . $config['ip'] . "\n"; // dyndns compatible output
exit;
}

// nsupdate commands
$nsupdateCommands = 'key ' . $config['hostname']
. ' ' . $config['key'] . "\n";
$nsupdateCommands = 'server ' . $dnsServer . "\n";
$nsupdateCommands .= 'key ' . $config['key'] . "\n";
$nsupdateCommands .= 'update delete ' . $config['hostname'] . "\n";
$nsupdateCommands .= 'update add ' . $config['hostname'] . ' '
. $config['ttl'] . ' A ' . $config['ip'] . "\n";
$nsupdateCommands .= 'update add ' . $config['hostname'] . ' ' . $config['ttl'] . ' A ' . $config['ip'] . "\n";
$nsupdateCommands .= "send\n\n";

// Prepare to execute nsupdate binary
Expand All @@ -69,23 +90,21 @@
// Execute nsupdate and print status info
$process = proc_open($nsupdate, $descriptors, $pipes);

echo "nsupdate web-interface\n";
echo "----------------------\n\n";
echo date("D M j G:i:s T Y") . "\n\n";
echo "Previous IP: " . $config['old_ip'] . "\n";
echo "New IP: " . $config['ip'] . "\n";

if (is_resource($process)) {
fwrite($pipes[0], $nsupdateCommands);
fclose($pipes[0]);

$prefix = 'STDOUT: ';
while ($s = fgets($pipes[1], 1024)) {
$errors .= 'STDOUT: ' . $s;
$errors .= $prefix . $s;
$prefix = '';
}
fclose($pipes[1]);

$prefix = 'STDERR: ';
while ($s = fgets($pipes[2], 1024)) {
$errors .= 'STDERR: ' . $s;
$errors .= $prefix . $s;
$prefix = '';
}
fclose($pipes[2]);

Expand All @@ -96,21 +115,19 @@

// Output errors if unsuccessfull, else update cache
if ($returnValue != 0) {
echo "\nError: DNS not updated!\n\n";
echo $errors;
echo "dnserr\n" . $errors;
exit;
}
echo 'good ' . $config['ip'] . "\n";

// Update cache
if (is_writable($cacheFile)
|| (!file_exists($cacheFile) && is_writeable($cacheDir))) {
$f = fopen($cacheFile, 'w');
fwrite($f, $config['ip']);
fclose($f);
} else {
echo "\nDNS updated!\n";

// Update cache
if (is_writable($cacheFile)
|| (!file_exists($cacheFile) && is_writeable($cacheDir))) {
$f = fopen($cacheFile, 'w');
fwrite($f, $config['ip']);
fclose($f);
echo "Cache updated!\n";
} else {
echo "Error: Cache not updated!\n";
}
echo "Error: Cache not updated!\n";
}

?>