Added IPv6 support

Author: stecklars

README.md

@@ -15,6 +15,7 @@
 ### Implemented
 * All necessary API functions for DNS actions implemented (REST API)
 * Determines correct public IP address, uses fallback API for determining the IP address, in case main API does return invalid / no IP
+* IPv6 Support
 * Updating of a specific subdomain, domain root, or subdomain
 * Creation of DNS record, if it doesn't already exist
 * If configured, lowers TTL to 300 seconds for the domain on each run, if necessary
@@ -23,12 +24,11 @@
 ### Missing
 * Support for domain root and wildcard / specific subdomains at the same time
 * Caching the IP provided to netcup DNS, to avoid running into (currently not existing) rate limits in the DNS API
-* IPv6 Support
 * Probably a lot more :grin: – to be continued...
 
 ## Getting started
 ### Configuration
-Configuration is very simple: Just fill out `config.php` with the required values.
+Configuration is very simple: Just fill out `config.php` with the required values. The options are explained in there.
 
 ### How to use
 `php update.php`

config.php

@@ -11,6 +11,10 @@
 //Enter subdomain to be used for dynamic DNS, alternatively '@' for domain root or '*' for wildcard. If the record doesn't exist, the script will create it.
 define('HOST', 'server');
 
+//If set to true, the script will check for your public IPv6 address too and add it as an AAAA-Record / change an existing AAAA-Record for the host.
+//Activate this only if you have IPv6 connectivity, or you *WILL* get errors.
+define('USE_IPV6', false);
+
 //If set to true, this will change TTL to 300 seconds on every run if necessary.
 define('CHANGE_TTL', true);
 

functions.php

@@ -70,7 +70,7 @@ function outputStderr($message)
 //Returns current public IPv4 address.
 function getCurrentPublicIPv4()
 {
-    $publicIP = file_get_contents('https://api.ipify.org');
+    $publicIP = rtrim(file_get_contents('https://api.ipify.org'));
 
     //Let's check that this is really a IPv4 address, just in case...
     if (filter_var($publicIP, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
@@ -91,6 +91,28 @@ function getCurrentPublicIPv4()
     return false;
 }
 
+//Returns current public IPv6 address
+function getCurrentPublicIPv6()
+{
+    $publicIP = rtrim(file_get_contents('https://ip6.seeip.org'));
+
+    if (filter_var($publicIP, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
+        return $publicIP;
+    }
+
+    outputWarning("https://ip6.seeip.org didn't return a valid IPv6 address.");
+    //If IP is invalid, try another API
+    $publicIP = rtrim(file_get_contents('https://v6.ident.me/'));
+
+    //Let's check the result of the second API
+    if (filter_var($publicIP, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
+        return $publicIP;
+    }
+
+    //Still no valid IP?
+    return false;
+}
+
 //Login into netcup domain API and returns Apisessionid
 function login($customernr, $apikey, $apipassword)
 {

update.php

@@ -8,6 +8,8 @@
 outputStdout("This script is not affiliated with netcup.");
 outputStdout("=============================================\n");
 
+outputStdout(sprintf("Updating DNS records for host %s on domain %s\n", HOST, DOMAIN));
+
 // Login
 if ($apisessionid = login(CUSTOMERNR, APIKEY, APIPASSWORD)) {
     outputStdout("Logged in successfully!");
@@ -45,11 +47,11 @@
 }
 
 //Find the host defined in config.php
-$foundHosts = array();
+$foundHostsV4 = array();
 
 foreach ($infoDnsRecords['responsedata']['dnsrecords'] as $record) {
     if ($record['hostname'] === HOST && $record['type'] === "A") {
-        $foundHosts[] = array(
+        $foundHostsV4[] = array(
             'id' => $record['id'],
             'hostname' => $record['hostname'],
             'type' => $record['type'],
@@ -62,52 +64,118 @@
 }
 
 //If we can't find the host, create it.
-if (count($foundHosts) === 0) {
-    outputStdout(sprintf("Host %s doesn't exist, creating necessary DNS-Record.", HOST));
-    $foundHosts[] = array(
+if (count($foundHostsV4) === 0) {
+    outputStdout(sprintf("A record for host %s doesn't exist, creating necessary DNS record.", HOST));
+    $foundHostsV4[] = array(
         'hostname' => HOST,
         'type' => 'A',
         'destination' => 'newly created Record',
     );
 }
 
 //If the host with A record exists more than one time...
-if (count($foundHosts) > 1) {
-    outputStderr(sprintf("Found multiple A-Records for the Host %s – Please specify a host for which only a single A-Record exists in config.php. Exiting.", HOST));
+if (count($foundHostsV4) > 1) {
+    outputStderr(sprintf("Found multiple A records for the host %s – Please specify a host for which only a single A record exists in config.php. Exiting.", HOST));
     exit(1);
 }
 
 //If we couldn't determine a valid public IPv4 address
-if (!$publicIP = getCurrentPublicIPv4()) {
+if (!$publicIPv4 = getCurrentPublicIPv4()) {
     outputStderr("Main API and fallback API didn't return a valid IPv4 address. Exiting.");
     exit(1);
 }
 
-$ipchange = false;
+$ipv4change = false;
 
 //Has the IP changed?
-foreach ($foundHosts as $record) {
-    if ($record['destination'] !== $publicIP) {
+foreach ($foundHostsV4 as $record) {
+    if ($record['destination'] !== $publicIPv4) {
         //Yes, it has changed.
-        $ipchange = true;
-        outputStdout(sprintf("IP has changed. Before: %s; Now: %s", $record['destination'], $publicIP));
+        $ipv4change = true;
+        outputStdout(sprintf("IPv4 address has changed. Before: %s; Now: %s", $record['destination'], $publicIPv4));
     } else {
         //No, it hasn't changed.
-        outputStdout("IP hasn't changed. Current IP: ".$publicIP."");
+        outputStdout("IPv4 address hasn't changed. Current IPv4 address: ".$publicIPv4);
     }
 }
 
 //Yes, it has changed.
-if ($ipchange === true) {
-    $foundHosts[0]['destination'] = $publicIP;
+if ($ipv4change === true) {
+    $foundHostsV4[0]['destination'] = $publicIPv4;
     //Update the record
-    if (updateDnsRecords(DOMAIN, CUSTOMERNR, APIKEY, $apisessionid, $foundHosts)) {
-        outputStdout("IP address updated successfully!");
+    if (updateDnsRecords(DOMAIN, CUSTOMERNR, APIKEY, $apisessionid, $foundHostsV4)) {
+        outputStdout("IPv4 address updated successfully!");
     } else {
         exit(1);
     }
 }
 
+if (USE_IPV6 === true) {
+    //Find the host defined in config.php
+    $foundHostsV6 = array();
+
+    foreach ($infoDnsRecords['responsedata']['dnsrecords'] as $record) {
+        if ($record['hostname'] === HOST && $record['type'] === "AAAA") {
+            $foundHostsV6[] = array(
+                'id' => $record['id'],
+                'hostname' => $record['hostname'],
+                'type' => $record['type'],
+                'priority' => $record['priority'],
+                'destination' => $record['destination'],
+                'deleterecord' => $record['deleterecord'],
+                'state' => $record['state'],
+            );
+        }
+    }
+
+    //If we can't find the host, create it.
+    if (count($foundHostsV6) === 0) {
+        outputStdout(sprintf("AAAA record for host %s doesn't exist, creating necessary DNS record.", HOST));
+        $foundHostsV6[] = array(
+            'hostname' => HOST,
+            'type' => 'AAAA',
+            'destination' => 'newly created Record',
+        );
+    }
+
+    //If the host with AAAA record exists more than one time...
+    if (count($foundHostsV6) > 1) {
+        outputStderr(sprintf("Found multiple AAAA records for the host %s – Please specify a host for which only a single AAAA record exists in config.php. Exiting.", HOST));
+        exit(1);
+    }
+
+    //If we couldn't determine a valid public IPv6 address
+    if (!$publicIPv6 = getCurrentPublicIPv6()) {
+        outputStderr("Main API and fallback API didn't return a valid IPv6 address. Do you have IPv6 connectivity? If not, please disable USE_IPV6 in config.php. Exiting.");
+        exit(1);
+    }
+
+    $ipv6change = false;
+
+    //Has the IP changed?
+    foreach ($foundHostsV6 as $record) {
+        if ($record['destination'] !== $publicIPv6) {
+            //Yes, it has changed.
+            $ipv6change = true;
+            outputStdout(sprintf("IPv6 address has changed. Before: %s; Now: %s", $record['destination'], $publicIPv6));
+        } else {
+            //No, it hasn't changed.
+            outputStdout("IPv6 address hasn't changed. Current IPv6 address: ".$publicIPv6);
+        }
+    }
+
+    //Yes, it has changed.
+    if ($ipv6change === true) {
+        $foundHostsV6[0]['destination'] = $publicIPv6;
+        //Update the record
+        if (updateDnsRecords(DOMAIN, CUSTOMERNR, APIKEY, $apisessionid, $foundHostsV6)) {
+            outputStdout("IPv6 address updated successfully!");
+        } else {
+            exit(1);
+        }
+    }
+}
+
 //Logout
 if (logout(CUSTOMERNR, APIKEY, $apisessionid)) {
     outputStdout("Logged out successfully!");