Add sender verification of D-Bus signals.

dbus/object_proxy.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DBUS_OBJECT_PROXY_H_
 #define DBUS_OBJECT_PROXY_H_
 
 #include <dbus/dbus.h>
 
 #include <map>
@@ skipping 218 matching lines @@
                             const base::StringPiece& method_name,
                             const base::StringPiece& error_name,
                             const base::StringPiece& error_message) const;
 
   // Used as ErrorCallback by CallMethod().
   void OnCallMethodError(const std::string& interface_name,
                          const std::string& method_name,
                          ResponseCallback response_callback,
                          ErrorResponse* error_response);
 
+  // Adds the match rule to the bus and associate the callback with the signal.
+  bool AddMatchRuleWithCallback(const std::string& match_rule,
+                                const std::string& absolute_signal_name,
+                                SignalCallback signal_callback);
+
+  // Adds the match rule to the bus so that HandleMessage can see the signal.
+  bool AddMatchRuleWithoutCallback(const std::string& match_rule,
+                                   const std::string& absolute_signal_name);
+
+  // Calls D-Bus's GetNameOwner method synchronously to update
+  // |service_name_owner_| with the current owner of |service_name_|.
+  //
+  // BLOCKING CALL.
+  void UpdateNameOwnerAndBlock();
+
+  // Handles NameOwnerChanged signal from D-Bus's special message bus.
+  DBusHandlerResult HandleNameOwnerChanged(dbus::Signal* signal);
+
   scoped_refptr<Bus> bus_;
   std::string service_name_;
   ObjectPath object_path_;
 
   // True if the message filter was added.
   bool filter_added_;
 
   // The method table where keys are absolute signal names (i.e. interface
   // name + signal name), and values are the corresponding callbacks.
   typedef std::map<std::string, SignalCallback> MethodTable;
   MethodTable method_table_;
 
   std::set<std::string> match_rules_;
 
   const bool ignore_service_unknown_errors_;
 
+  // Known name owner of the well-known bus name represnted by |service_name_|.
+  std::string service_name_owner_;
+
   DISALLOW_COPY_AND_ASSIGN(ObjectProxy);
 };
 
 }  // namespace dbus
 
 #endif  // DBUS_OBJECT_PROXY_H_