201 lines
5.4 KiB
PHP
201 lines
5.4 KiB
PHP
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<?php
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//error_reporting(-1);
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ini_set('display_errors', 'On');
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// main domain for dynamic DNS
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$dyndns = "ddns.kawomi.com";
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// short sanity check for given IP
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function checkip($ip) {
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$iptupel = explode(".", $ip);
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foreach ($iptupel as $value)
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{
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if ($value < 0 || $value > 255)
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return false;
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}
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return true;
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}
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function getFormValue($varname, $defaultValue){
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$retVal=$defaultValue;
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if ( isset($_POST[$varname]) )
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{
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$retVal = $_POST[$varname];
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}
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else if ( isset($_GET[$varname]) )
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{
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$retVal = $_GET[$varname];
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}
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return $retVal;
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}
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$remoteip = $_SERVER['REMOTE_ADDR'];
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// retrieve parameters
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$ip = getFormValue('address',$_SERVER['REMOTE_ADDR']);
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if ($ip=="") {$ip=$remoteip;}
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$autoupdate=getFormValue('autoupdate',0);
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$subdomain = getFormValue('domain',null);
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// open log session
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openlog("DDNS-Provider", LOG_PID | LOG_PERROR, LOG_LOCAL0);
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// check for given domain
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if (is_null($subdomain)) {
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// No Domain; display form
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?>
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<!DOCTYPE html>
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<html>
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<head>
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<title>Dynamic DNS Updater</title>
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<style type="text/css">
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.box {
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border:2px solid;
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border-radius:5px;
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}
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td {
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padding:0px;
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}
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</style>
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<script>
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function buildUrl(){
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var domain=document.getElementsByName('domain')[0].value;
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var url=window.location.href+"?domain="+domain;
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var autoupdate=document.getElementsByName("autoupdate")[0].value
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if (autoupdate > 0 ) {
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url = url + "&autoupdate=" + autoupdate;
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document.getElementsByName('address')[0].value="";
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}
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var ip=document.getElementsByName('address')[0].value;
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if (""!=ip) {
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url = url + "&address="+ip;
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}
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var password=document.getElementsByName('password')[0].value;
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if (""!=password) {
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url = url + "&password="+password;
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}
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var email=document.getElementsByName('email')[0].value;
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if (""!=email) {
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url = url + "&email="+email;
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}
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document.getElementById('updateUrl').innerText=url;
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}
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</script>
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</head>
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<body onload='buildUrl();'>
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<h1>Enter Dynamic DNS details</h1>
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<hr/>
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<form type="GET">
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<div class='box' style='width:600px'><div>Subdomain-name (required):</div><div><input onkeyup='buildUrl()' onchange='buildUrl()' name='domain' value='' />.ddns.kawomi.com</div></div>
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<div class='box' style='width:600px'><div>Password (optional, sent as clear text, required to update if given)</div><div><input onkeyup='buildUrl()' onchange='buildUrl()' type='text' name='password'></div></div>
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<div class='box' style='width:600px'><div>E-Mail (optional, password recovery mail is sent to this address)</div><div><input onkeyup='buildUrl()' onchange='buildUrl()' type='email' name='email'></div></div>
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<table border='0'>
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<tr>
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<td><div class='box' style='width:250px'><div>Manual Overwrite IP Address(optional)</div><div><input onkeyup='buildUrl()' onchange='buildUrl()' name='address' value='' /></div></div></td>
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<td><div style='border:0px;width:90px;text-align:center;font-weight:bold;'> <-- OR --> </div></td>
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<td><div class='box' style='width:250px'><div>AutoUpdate (only AutoAddress)</div><div><span><input name="autoupdate" onkeyup='buildUrl()' onchange='buildUrl();document.getElementById("autoUpdMins").value=(this.value>0?this.value:"OFF");' type="range" min="0" max="60" step="1" value="0" /><input readonly='readonly' size='1' id='autoUpdMins' value='OFF' type='Text' /> Minutes. </span></div></div></td>
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</tr>
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</table>
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<hr>
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Update-URL:<div id='updateUrl'></div>
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<hr>
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<input type='submit' />
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</form>
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</body>
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</html>
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<?php
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exit(0);
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}
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// check for needed variables
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if (!( isset($subdomain) && isset($ip))) {
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$msg= "DDNS change for ip $ip with subdomain $subdomain failed because of missing values";
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syslog(LOG_INFO, $msg);
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echo $msg;
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exit(0);
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}
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// short sanity check for given IP
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if (!( preg_match("/^(\d{1,3}\.){3}\d{1,3}$/", $ip) && checkip($ip) && $ip != "0.0.0.0" && $ip != "255.255.255.255" )) {
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$msg="IP $ip subdomain $subdomain was invalid remoteip: $remoteip";
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syslog(LOG_INFO, $msg);
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echo $msg;
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exit(0);
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}
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// short sanity check for given domain
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if (!( preg_match("/^[\w\d\-\_\.]+$/", $subdomain))) {
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$msg="Domain $subdomain for $user from $ip with $subdomain was invalid ";
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syslog(LOG_INFO, $msg);
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echo $msg;
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exit(0);
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}
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if ($subdomain == "ns") {
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$msg="subdomain ns is reserved and can't be changed.";
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syslog(LOG_INFO, $msg);
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echo $msg;
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exit(0);
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}
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// shell escape all values
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$subdomain = escapeshellcmd($subdomain);
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$ip = escapeshellcmd($ip);
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// prepare command
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$data = "<<EOF
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server ns.ddns.kawomi.com
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zone $dyndns
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update delete $subdomain.$dyndns. A
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update add $subdomain.$dyndns. 60 A $ip
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send
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EOF
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";
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// run DNS update
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exec("/usr/bin/nsupdate $data", $cmdout, $ret);
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// check whether DNS update was successful
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if ($ret != 0)
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{
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$msg= "Changing DNS for $subdomain.$dyndns to $ip failed with code $ret";
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syslog(LOG_INFO, $msg);
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echo $msg;
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exit(0);
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}
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$msg= "Changing DNS for $subdomain.$dyndns to $ip successful.";
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syslog(LOG_INFO, $msg);
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echo $msg;
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if ($autoupdate > 0 and $autoupdate <= 60) {
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?>
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<hr/>
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autoupdate requested, refreshing address every <?=$autoupdate?> minutes.<br/>
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Countdown: <span id='countdown'></span>
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<script>
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var i=60*<?=$autoupdate?>; window.setInterval(function(){i--; if (i<1) { i=60*<?=$autoupdate?>;window.clearInterval();window.location.reload(); } else {document.getElementById('countdown').innerHTML=i;}},1000);
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</script>
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<?php
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}
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// close log session
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closelog();
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exit(0);
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?>
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<!-- vim: ts=2 sw=2 nowrap et -->
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