Improve custom DNS hosts parsing

Handle variable whitespace and comments in the custom DNS hosts file.

Also, correctly fill the "domains" field in getCustomDNSEntries output.

Signed-off-by: Nick Forrington <nick.forrington@gmail.com>

scripts/pi-hole/php/func.php

@@ -200,18 +200,22 @@ function getCustomDNSEntries()
     $handle = fopen($customDNSFile, 'r');
     if ($handle) {
         while (($line = fgets($handle)) !== false) {
-            $line = str_replace("\r", '', $line);
-            $line = str_replace("\n", '', $line);
-            $explodedLine = explode(' ', $line);
+            $line = trim($line);
 
-            if (count($explodedLine) != 2) {
+            if (!$line || $line[0] == '#') {
+                continue;
+            }
+
+            $explodedLine = preg_split('/\s+/', $line);
+
+            if (count($explodedLine) < 2) {
                 continue;
             }
 
             $data = new stdClass();
             $data->ip = $explodedLine[0];
             $data->domain = $explodedLine[1];
-            $data->domains = array_slice($explodedLine, 0, -1);
+            $data->domains = array_slice($explodedLine, 1);
             $entries[] = $data;
         }