[gdm/multi-stack: 40/50] Emit "service-unavailable" from session when pam service refuses to work

[Ray Strode <halfline src gnome org>]

commit 6fe26b18d87e1d5319fe5300346a0a6368ff6b4d
Author: Ray Strode <rstrode redhat com>
Date:   Wed Oct 28 21:32:00 2009 -0400

    Emit "service-unavailable" from session when pam service refuses to work

 daemon/gdm-session-direct.c  |   26 +++++++++++++++++++++++---
 daemon/gdm-session-private.h |    2 ++
 daemon/gdm-session-relay.c   |   33 +++++++++++++++++++++++++++++++++
 daemon/gdm-session-worker.c  |   29 ++++++++++++++++++++++-------
 daemon/gdm-session.c         |   21 +++++++++++++++++++++
 daemon/gdm-session.h         |    2 ++
 6 files changed, 103 insertions(+), 10 deletions(-)
---
diff --git a/daemon/gdm-session-direct.c b/daemon/gdm-session-direct.c
index d6a5a5b..e51ea18 100644
--- a/daemon/gdm-session-direct.c
+++ b/daemon/gdm-session-direct.c
@@ -280,9 +280,27 @@ on_session_exited (GdmSession *session,
 }
 
 static DBusHandlerResult
-gdm_session_direct_handle_setup_complete (GdmSessionDirect *session,
-                                          GdmSessionConversation *conversation,
-                                          DBusMessage      *message)
+gdm_session_direct_handle_service_unavailable (GdmSessionDirect *session,
+                                               GdmSessionConversation *conversation,
+                                               DBusMessage      *message)
+{
+        DBusMessage *reply;
+
+        g_debug ("GdmSessionDirect: Emitting 'service-unavailable' signal");
+
+        reply = dbus_message_new_method_return (message);
+        dbus_connection_send (conversation->worker_connection, reply, NULL);
+        dbus_message_unref (reply);
+
+        _gdm_session_service_unavailable (GDM_SESSION (session), conversation->service_name);
+
+        return DBUS_HANDLER_RESULT_HANDLED;
+}
+
+static DBusHandlerResult
+gdm_session_direct_handle_setup_complete  (GdmSessionDirect *session,
+                                           GdmSessionConversation *conversation,
+                                           DBusMessage      *message)
 {
         DBusMessage *reply;
 
@@ -1275,6 +1293,8 @@ session_worker_message (DBusConnection *connection,
                 return gdm_session_direct_handle_problem (session, conversation, message);
         } else if (dbus_message_is_method_call (message, GDM_SESSION_DBUS_INTERFACE, "CancelPendingQuery")) {
                 return gdm_session_direct_handle_cancel_pending_query (session, conversation, message);
+        } else if (dbus_message_is_method_call (message, GDM_SESSION_DBUS_INTERFACE, "ServiceUnavailable")) {
+                return gdm_session_direct_handle_service_unavailable (session, conversation, message);
         } else if (dbus_message_is_method_call (message, GDM_SESSION_DBUS_INTERFACE, "SetupComplete")) {
                 return gdm_session_direct_handle_setup_complete (session, conversation, message);
         } else if (dbus_message_is_method_call (message, GDM_SESSION_DBUS_INTERFACE, "SetupFailed")) {
diff --git a/daemon/gdm-session-private.h b/daemon/gdm-session-private.h
index 36781dd..e0a810e 100644
--- a/daemon/gdm-session-private.h
+++ b/daemon/gdm-session-private.h
@@ -31,6 +31,8 @@ void             _gdm_session_conversation_started         (GdmSession   *sessio
                                                             const char   *service_name);
 void             _gdm_session_conversation_stopped         (GdmSession   *session,
                                                             const char   *service_name);
+void             _gdm_session_service_unavailable          (GdmSession   *session,
+                                                            const char   *service_name);
 void             _gdm_session_setup_complete               (GdmSession   *session,
                                                             const char   *service_name);
 void             _gdm_session_setup_failed                 (GdmSession   *session,
diff --git a/daemon/gdm-session-relay.c b/daemon/gdm-session-relay.c
index 3bf8ed7..a933557 100644
--- a/daemon/gdm-session-relay.c
+++ b/daemon/gdm-session-relay.c
@@ -463,6 +463,34 @@ handle_problem (GdmSessionRelay *session_relay,
 }
 
 static DBusHandlerResult
+handle_service_unavailable (GdmSessionRelay *session_relay,
+                            DBusConnection  *connection,
+                            DBusMessage     *message)
+{
+        DBusMessage *reply;
+        DBusError    error;
+        char        *service_name;
+
+        dbus_error_init (&error);
+        if (! dbus_message_get_args (message, &error,
+                                     DBUS_TYPE_STRING, &service_name,
+                                     DBUS_TYPE_INVALID)) {
+                g_warning ("ERROR: %s", error.message);
+        }
+        dbus_error_free (&error);
+
+        g_debug ("GdmSessionRelay: ServiceUnavailable");
+
+        reply = dbus_message_new_method_return (message);
+        dbus_connection_send (connection, reply, NULL);
+        dbus_message_unref (reply);
+
+        _gdm_session_service_unavailable (GDM_SESSION (session_relay), service_name);
+
+        return DBUS_HANDLER_RESULT_HANDLED;
+}
+
+static DBusHandlerResult
 handle_setup_complete (GdmSessionRelay *session_relay,
                        DBusConnection  *connection,
                        DBusMessage     *message)
@@ -841,6 +869,8 @@ session_handle_child_message (DBusConnection *connection,
                 return handle_info (session_relay, connection, message);
         } else if (dbus_message_is_method_call (message, GDM_SESSION_RELAY_DBUS_INTERFACE, "Problem")) {
                 return handle_problem (session_relay, connection, message);
+        } else if (dbus_message_is_method_call (message, GDM_SESSION_RELAY_DBUS_INTERFACE, "ServiceUnavailable")) {
+                return handle_service_unavailable (session_relay, connection, message);
         } else if (dbus_message_is_method_call (message, GDM_SESSION_RELAY_DBUS_INTERFACE, "SetupComplete")) {
                 return handle_setup_complete (session_relay, connection, message);
         } else if (dbus_message_is_method_call (message, GDM_SESSION_RELAY_DBUS_INTERFACE, "SetupFailed")) {
@@ -898,6 +928,9 @@ do_introspect (DBusConnection *connection,
                                "    <method name=\"ConversationStarted\">\n"
                                "      <arg name=\"service_name\" direction=\"in\" type=\"s\"/>\n"
                                "    </method>\n"
+                               "    <method name=\"ServiceUnavailable\">\n"
+                               "      <arg name=\"message\" direction=\"in\" type=\"s\"/>\n"
+                               "    </method>\n"
                                "    <method name=\"SetupComplete\">\n"
                                "    </method>\n"
                                "    <method name=\"SetupFailed\">\n"
diff --git a/daemon/gdm-session-worker.c b/daemon/gdm-session-worker.c
index 72fdfa8..72fd2a3 100644
--- a/daemon/gdm-session-worker.c
+++ b/daemon/gdm-session-worker.c
@@ -2361,9 +2361,16 @@ do_setup (GdmSessionWorker *worker)
                                                  worker->priv->display_device,
                                                  &error);
         if (! res) {
-                send_dbus_string_method (worker->priv->connection,
-                                         "SetupFailed",
-                                         error->message);
+                if (g_error_matches (error,
+                                     GDM_SESSION_WORKER_ERROR,
+                                     GDM_SESSION_WORKER_ERROR_SERVICE_UNAVAILABLE)) {
+                        send_dbus_void_method (worker->priv->connection,
+                                               "ServiceUnavailable");
+                } else {
+                        send_dbus_string_method (worker->priv->connection,
+                                                 "SetupFailed",
+                                                 error->message);
+                }
                 g_error_free (error);
                 return;
         }
@@ -2384,10 +2391,18 @@ do_authenticate (GdmSessionWorker *worker)
                                                     worker->priv->password_is_required,
                                                     &error);
         if (! res) {
-                g_debug ("GdmSessionWorker: Unable to verify user");
-                send_dbus_string_method (worker->priv->connection,
-                                         "AuthenticationFailed",
-                                         error->message);
+                if (g_error_matches (error,
+                                     GDM_SESSION_WORKER_ERROR,
+                                     GDM_SESSION_WORKER_ERROR_SERVICE_UNAVAILABLE)) {
+                        g_debug ("GdmSessionWorker: Unable to use authentication service");
+                        send_dbus_void_method (worker->priv->connection,
+                                               "ServiceUnavailable");
+                } else {
+                        g_debug ("GdmSessionWorker: Unable to verify user");
+                        send_dbus_string_method (worker->priv->connection,
+                                                 "AuthenticationFailed",
+                                                 error->message);
+                }
                 g_error_free (error);
                 return;
         }
diff --git a/daemon/gdm-session.c b/daemon/gdm-session.c
index 8858071..8c4548a 100644
--- a/daemon/gdm-session.c
+++ b/daemon/gdm-session.c
@@ -31,6 +31,7 @@
 enum {
         CONVERSATION_STARTED = 0,
         CONVERSATION_STOPPED,
+        SERVICE_UNAVAILABLE,
         SETUP_COMPLETE,
         SETUP_FAILED,
         RESET_COMPLETE,
@@ -251,6 +252,17 @@ gdm_session_class_init (gpointer g_iface)
                               g_cclosure_marshal_VOID__STRING,
                               G_TYPE_NONE,
                               1, G_TYPE_STRING);
+        signals [SERVICE_UNAVAILABLE] =
+                g_signal_new ("service-unavailable",
+                              iface_type,
+                              G_SIGNAL_RUN_FIRST,
+                              G_STRUCT_OFFSET (GdmSessionIface, service_unavailable),
+                              NULL,
+                              NULL,
+                              g_cclosure_marshal_VOID__STRING,
+                              G_TYPE_NONE,
+                              1,
+                              G_TYPE_STRING);
         signals [SETUP_COMPLETE] =
                 g_signal_new ("setup-complete",
                               iface_type,
@@ -525,6 +537,15 @@ gdm_session_class_init (gpointer g_iface)
 }
 
 void
+_gdm_session_service_unavailable (GdmSession   *session,
+                                  const char   *service_name)
+{
+        g_return_if_fail (GDM_IS_SESSION (session));
+
+        g_signal_emit (session, signals [SERVICE_UNAVAILABLE], 0, service_name);
+}
+
+void
 _gdm_session_setup_complete (GdmSession   *session,
                              const char   *service_name)
 {
diff --git a/daemon/gdm-session.h b/daemon/gdm-session.h
index 22c2ccb..9636b92 100644
--- a/daemon/gdm-session.h
+++ b/daemon/gdm-session.h
@@ -49,6 +49,8 @@ struct _GdmSessionIface
                                               const char   *service_name);
         void (* stop_conversation)           (GdmSession   *session,
                                               const char   *service_name);
+        void (* service_unavailable)         (GdmSession   *session,
+                                              const char   *service_name);
         void (* setup)                       (GdmSession   *session,
                                               const char   *service_name);
         void (* setup_for_user)              (GdmSession   *session,