Fix LDAP DN concatenation, allow to define a search base

library/Icinga/Protocol/Ldap/Connection.php

@@ -235,9 +235,10 @@ class Connection
         // We do not support pagination right now, and there is no chance to
         // do so for PHP < 5.4. Warnings about "Sizelimit exceeded" will
         // therefore not be hidden right now.
+        $base = $query->hasBase() ? $query->getBase() : $this->root_dn;
         $results = @ldap_search(
             $this->ds,
-            $this->root_dn,
+            $base,
             (string) $query,
             $fields,
             0, // Attributes and values

library/Icinga/Protocol/Ldap/Node.php

@@ -90,6 +90,6 @@ class Node extends Root
      */
     public function getDN()
     {
-        return $this->parent->getDN() . '.' . $this->getRDN();
+        return $this->getRDN() . ',' . $this->parent->getDN();
     }
 }

library/Icinga/Protocol/Ldap/Query.php

@@ -30,6 +30,7 @@ class Query
     protected $limit_offset;
     protected $sort_columns = array();
     protected $count;
+    protected $base;
 
     /**
      * Constructor
@@ -42,6 +43,22 @@ class Query
         $this->connection = $connection;
     }
 
+    public function setBase($base)
+    {
+        $this->base = $base;
+        return $this;
+    }
+
+    public function hasBase()
+    {
+        return $this->base !== null;
+    }
+
+    public function getBase()
+    {
+        return $this->base;
+    }
+
     /**
      * Count result set, ignoring limits
      *