Added the lookup of IP if device hostname is a hostname

includes/common.php

@@ -1040,3 +1040,17 @@ function version_info($remote=true) {
     return $output;
 
 }//end version_info()
+
+/**
+* Convert a MySQL binary v4 (4-byte) or v6 (16-byte) IP address to a printable string.
+* @param string $ip A binary string containing an IP address, as returned from MySQL's INET6_ATON function
+* @return string Empty if not valid.
+*/
+// Fuction is from http://uk3.php.net/manual/en/function.inet-ntop.php
+function inet6_ntop($ip) {
+    $l = strlen($ip);
+    if ($l == 4 or $l == 16) {
+        return inet_ntop(pack('A' . $l, $ip));
+    }
+    return '';
+}

includes/functions.php

@@ -1320,3 +1320,28 @@ function oxidized_reload_nodes() {
         curl_close($ch);
     }
 }
+
+/**
+ * Perform DNS lookup
+ *
+ * @param array $device Device array from database
+ * @param string $type The type of record to lookup
+ *
+ * @return string ip
+ *
+**/
+function dnslookup($device,$type=false) {
+    if (empty($type)) {
+        // We are going to use the transport to work out the record type
+        if ($device['transport'] == 'udp6' || $device['transport'] == 'tcp6') {
+            $type = DNS_AAAA;
+            $return = 'ipv6';
+        }
+        else {
+            $type = DNS_A;
+            $return = 'ip';
+        }
+    }
+    $record = dns_get_record($device['hostname'],$type);
+    return $record[0][$return];
+}//end dnslookup

includes/polling/functions.inc.php

@@ -138,6 +138,14 @@ function poll_device($device, $options) {
     $device_start = microtime(true);
     // Start counting device poll time
     echo $device['hostname'].' '.$device['device_id'].' '.$device['os'].' ';
+    $ip = dnslookup($device);
+
+    if (!empty($ip) && $ip != inet6_ntop($device['ip'])) {
+        log_event('Device IP changed to '.$ip, $device, 'system');
+        $db_ip = inet_pton($ip);
+        dbUpdate(array('ip' => $db_ip), 'devices', 'device_id=?', array($device['device_id']));
+    }
+
     if ($config['os'][$device['os']]['group']) {
         $device['os_group'] = $config['os'][$device['os']]['group'];
         echo '('.$device['os_group'].')';