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[gdm/multi-stack: 7/22] Make greeter/autologin session explicitly request PAM conversation

commit f1ea71bcd26119f3d7a9564353562351f6840d3c
Author: Ray Strode <rstrode redhat com>
Date:   Fri Jan 16 13:01:48 2009 -0500

    Make greeter/autologin session explicitly request PAM conversation
    
    Now the greeter (and also the autologin code) has to say what
    PAM stack it wants the slave to run.  When that stack is ready,
    we emit the Ready signal as before, but now the Ready signal
    carries a string argument saying which service is ready to
    converse.
    
    When we support multiple PAM stacks, the greeter will call
    StartConversation for each stack, and will keep the UI
    associated with each stack disabled until the Ready signals
    come back one-by-one.

 daemon/gdm-factory-slave.c               |    3 +-
 daemon/gdm-greeter-server.c              |   53 ++++++++++++++++++++++++++++--
 daemon/gdm-greeter-server.h              |    5 ++-
 daemon/gdm-simple-slave.c                |   32 +++++++++++++++++-
 gui/simple-greeter/gdm-greeter-client.c  |   18 ++++++----
 gui/simple-greeter/gdm-greeter-client.h  |    4 ++-
 gui/simple-greeter/gdm-greeter-session.c |    4 ++
 7 files changed, 104 insertions(+), 15 deletions(-)
---
diff --git a/daemon/gdm-factory-slave.c b/daemon/gdm-factory-slave.c
index 09cdf5d..b530e68 100644
--- a/daemon/gdm-factory-slave.c
+++ b/daemon/gdm-factory-slave.c
@@ -186,7 +186,8 @@ on_session_conversation_started (GdmSession      *session,
 {
         g_debug ("GdmFactorySlave: session conversation started");
 
-        gdm_greeter_server_ready (slave->priv->greeter_server);
+        gdm_greeter_server_ready (slave->priv->greeter_server,
+                                  service_name);
 }
 
 static void
diff --git a/daemon/gdm-greeter-server.c b/daemon/gdm-greeter-server.c
index 0c67f1e..8640ad4 100644
--- a/daemon/gdm-greeter-server.c
+++ b/daemon/gdm-greeter-server.c
@@ -70,6 +70,7 @@ enum {
 };
 
 enum {
+        START_CONVERSATION,
         BEGIN_AUTO_LOGIN,
         BEGIN_VERIFICATION,
         BEGIN_VERIFICATION_FOR_USER,
@@ -247,9 +248,10 @@ gdm_greeter_server_reset (GdmGreeterServer *greeter_server)
 }
 
 gboolean
-gdm_greeter_server_ready (GdmGreeterServer *greeter_server)
+gdm_greeter_server_ready (GdmGreeterServer *greeter_server,
+                          const char       *service_name)
 {
-        send_dbus_void_signal (greeter_server, "Ready");
+        send_dbus_string_signal (greeter_server, "Ready", service_name);
         return TRUE;
 }
 
@@ -324,6 +326,34 @@ generate_address (void)
 }
 
 static DBusHandlerResult
+handle_start_conversation (GdmGreeterServer *greeter_server,
+                           DBusConnection   *connection,
+                           DBusMessage      *message)
+{
+        DBusMessage *reply;
+        DBusError    error;
+        const 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 ("GreeterServer: StartConversation");
+
+        reply = dbus_message_new_method_return (message);
+        dbus_connection_send (connection, reply, NULL);
+        dbus_message_unref (reply);
+
+        g_signal_emit (greeter_server, signals [START_CONVERSATION], 0, service_name);
+
+        return DBUS_HANDLER_RESULT_HANDLED;
+}
+
+static DBusHandlerResult
 handle_begin_verification (GdmGreeterServer *greeter_server,
                            DBusConnection   *connection,
                            DBusMessage      *message)
@@ -646,7 +676,9 @@ greeter_handle_child_message (DBusConnection *connection,
 {
         GdmGreeterServer *greeter_server = GDM_GREETER_SERVER (user_data);
 
-        if (dbus_message_is_method_call (message, GDM_GREETER_SERVER_DBUS_INTERFACE, "BeginVerification")) {
+        if (dbus_message_is_method_call (message, GDM_GREETER_SERVER_DBUS_INTERFACE, "StartConversation")) {
+                return handle_start_conversation (greeter_server, connection, message);
+        } else if (dbus_message_is_method_call (message, GDM_GREETER_SERVER_DBUS_INTERFACE, "BeginVerification")) {
                 return handle_begin_verification (greeter_server, connection, message);
         } else if (dbus_message_is_method_call (message, GDM_GREETER_SERVER_DBUS_INTERFACE, "BeginVerificationForUser")) {
                 return handle_begin_verification_for_user (greeter_server, connection, message);
@@ -700,7 +732,11 @@ do_introspect (DBusConnection *connection,
         /* interface */
         xml = g_string_append (xml,
                                "  <interface name=\"org.gnome.DisplayManager.GreeterServer\">\n"
+                               "    <method name=\"StartConversation\">\n"
+                               "      <arg name=\"service_name\" direction=\"in\" type=\"s\"/>\n"
+                               "    </method>\n"
                                "    <method name=\"BeginVerification\">\n"
+                               "    </method>\n"
                                "    <method name=\"BeginTimedLogin\">\n"
                                "    </method>\n"
                                "    <method name=\"BeginVerificationForUser\">\n"
@@ -760,6 +796,7 @@ do_introspect (DBusConnection *connection,
                                "      <arg name=\"delay\" type=\"i\"/>\n"
                                "    </signal>\n"
                                "    <signal name=\"Ready\">\n"
+                               "      <arg name=\"service-name\" type=\"s\"/>\n"
                                "    </signal>\n"
                                "    <signal name=\"Reset\">\n"
                                "    </signal>\n"
@@ -1122,6 +1159,16 @@ gdm_greeter_server_class_init (GdmGreeterServerClass *klass)
                                                               "group name",
                                                               GDM_GROUPNAME,
                                                               G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
+        signals [START_CONVERSATION] =
+                g_signal_new ("start-conversation",
+                              G_OBJECT_CLASS_TYPE (object_class),
+                              G_SIGNAL_RUN_FIRST,
+                              G_STRUCT_OFFSET (GdmGreeterServerClass, start_conversation),
+                              NULL,
+                              NULL,
+                              g_cclosure_marshal_VOID__STRING,
+                              G_TYPE_NONE,
+                              1, G_TYPE_STRING);
         signals [BEGIN_VERIFICATION] =
                 g_signal_new ("begin-verification",
                               G_OBJECT_CLASS_TYPE (object_class),
diff --git a/daemon/gdm-greeter-server.h b/daemon/gdm-greeter-server.h
index 6e92100..7333db1 100644
--- a/daemon/gdm-greeter-server.h
+++ b/daemon/gdm-greeter-server.h
@@ -45,6 +45,8 @@ typedef struct
 {
         GObjectClass   parent_class;
 
+        void (* start_conversation)         (GdmGreeterServer  *greeter_server,
+                                             const char        *service_name);
         void (* begin_auto_login)           (GdmGreeterServer  *greeter_server);
         void (* begin_verification)         (GdmGreeterServer  *greeter_server);
         void (* begin_verification_for_user)(GdmGreeterServer  *greeter_server,
@@ -85,7 +87,8 @@ gboolean            gdm_greeter_server_info                  (GdmGreeterServer *
 gboolean            gdm_greeter_server_problem               (GdmGreeterServer *greeter_server,
                                                               const char       *text);
 gboolean            gdm_greeter_server_reset                 (GdmGreeterServer *greeter_server);
-gboolean            gdm_greeter_server_ready                 (GdmGreeterServer *greeter_server);
+gboolean            gdm_greeter_server_ready                 (GdmGreeterServer *greeter_server,
+                                                              const char       *service_name);
 void                gdm_greeter_server_selected_user_changed (GdmGreeterServer *greeter_server,
                                                               const char       *text);
 void                gdm_greeter_server_default_language_name_changed (GdmGreeterServer *greeter_server,
diff --git a/daemon/gdm-simple-slave.c b/daemon/gdm-simple-slave.c
index 7bc6e02..fe4e172 100644
--- a/daemon/gdm-simple-slave.c
+++ b/daemon/gdm-simple-slave.c
@@ -524,6 +524,7 @@ on_session_secret_info_query (GdmSession     *session,
 
 static void
 on_session_conversation_started (GdmSession     *session,
+                                 const char     *service_name,
                                  GdmSimpleSlave *slave)
 {
         gboolean res;
@@ -533,7 +534,8 @@ on_session_conversation_started (GdmSession     *session,
 
         g_debug ("GdmSimpleSlave: session conversation started");
         if (slave->priv->greeter_server != NULL) {
-                res = gdm_greeter_server_ready (slave->priv->greeter_server);
+                res = gdm_greeter_server_ready (slave->priv->greeter_server,
+                                                service_name);
                 if (! res) {
                         g_warning ("Unable to send ready");
                 }
@@ -549,8 +551,10 @@ on_session_conversation_started (GdmSession     *session,
                 gdm_greeter_server_request_timed_login (slave->priv->greeter_server, username, delay);
         } else {
                 g_debug ("GdmSimpleSlave: begin auto login for user '%s'", username);
+                /* service_name will be "gdm-autologin"
+                 */
                 gdm_session_setup_for_user (GDM_SESSION (slave->priv->session),
-                                            "gdm-autologin",
+                                            service_name,
                                             username);
         }
 
@@ -782,6 +786,16 @@ on_greeter_session_died (GdmGreeterSession    *greeter,
 }
 
 static void
+on_greeter_start_conversation (GdmGreeterServer *greeter_server,
+                               const char       *service_name,
+                               GdmSimpleSlave   *slave)
+{
+        g_debug ("GdmSimpleSlave: starting conversation with '%s' pam service'", service_name);
+        gdm_session_start_conversation (GDM_SESSION (slave->priv->session),
+                                        service_name);
+}
+
+static void
 on_greeter_begin_verification (GdmGreeterServer *greeter_server,
                                GdmSimpleSlave   *slave)
 {
@@ -956,6 +970,10 @@ start_greeter (GdmSimpleSlave *slave)
 
         slave->priv->greeter_server = gdm_greeter_server_new (display_id);
         g_signal_connect (slave->priv->greeter_server,
+                          "start-conversation",
+                          G_CALLBACK (on_greeter_start_conversation),
+                          slave);
+        g_signal_connect (slave->priv->greeter_server,
                           "begin-auto-login",
                           G_CALLBACK (on_greeter_begin_auto_login),
                           slave);
@@ -1066,10 +1084,20 @@ idle_connect_to_display (GdmSimpleSlave *slave)
                 if (! enabled || delay > 0) {
                         start_greeter (slave);
                         create_new_session (slave);
+
+                        if (enabled) {
+                                g_debug ("GdmSimpleSlave: Starting timed login conversation");
+                                gdm_session_start_conversation (GDM_SESSION (slave->priv->session),
+                                                                "gdm-autologin");
+                        }
                 } else {
                         /* Run the init script. gdmslave suspends until script has terminated */
                         gdm_slave_run_script (GDM_SLAVE (slave), GDMCONFDIR "/Init", GDM_USERNAME);
                         reset_session (slave);
+
+                        g_debug ("GdmSimpleSlave: Starting automatic login conversation");
+                        gdm_session_start_conversation (GDM_SESSION (slave->priv->session),
+                                                        "gdm-autologin");
                 }
         } else {
                 if (slave->priv->connection_attempts >= MAX_CONNECT_ATTEMPTS) {
diff --git a/gui/simple-greeter/gdm-greeter-client.c b/gui/simple-greeter/gdm-greeter-client.c
index ed4dd95..8d061a4 100644
--- a/gui/simple-greeter/gdm-greeter-client.c
+++ b/gui/simple-greeter/gdm-greeter-client.c
@@ -237,11 +237,7 @@ static void
 on_ready (GdmGreeterClient *client,
           DBusMessage      *message)
 {
-        g_debug ("GdmGreeterClient: Ready");
-
-        g_signal_emit (client,
-                       gdm_greeter_client_signals[READY],
-                       0);
+        emit_string_signal_for_message (client, "Ready", message, READY);
 }
 
 static void
@@ -400,6 +396,14 @@ send_dbus_void_method (DBusConnection *connection,
 }
 
 void
+gdm_greeter_client_call_start_conversation (GdmGreeterClient *client,
+                                            const char       *service_name)
+{
+        send_dbus_string_method (client->priv->connection,
+                                 "StartConversation", service_name);
+}
+
+void
 gdm_greeter_client_call_begin_auto_login (GdmGreeterClient *client,
                                           const char       *username)
 {
@@ -879,9 +883,9 @@ gdm_greeter_client_class_init (GdmGreeterClientClass *klass)
                               G_STRUCT_OFFSET (GdmGreeterClientClass, ready),
                               NULL,
                               NULL,
-                              g_cclosure_marshal_VOID__VOID,
+                              g_cclosure_marshal_VOID__STRING,
                               G_TYPE_NONE,
-                              0);
+                              1, G_TYPE_STRING);
 
         gdm_greeter_client_signals[RESET] =
                 g_signal_new ("reset",
diff --git a/gui/simple-greeter/gdm-greeter-client.h b/gui/simple-greeter/gdm-greeter-client.h
index 08deabd..88b0281 100644
--- a/gui/simple-greeter/gdm-greeter-client.h
+++ b/gui/simple-greeter/gdm-greeter-client.h
@@ -84,13 +84,15 @@ GQuark             gdm_greeter_client_error_quark                    (void);
 GdmGreeterClient * gdm_greeter_client_new                            (void);
 
 gboolean           gdm_greeter_client_start                          (GdmGreeterClient *client,
-                                                                         GError          **error);
+                                                                      GError          **error);
 void               gdm_greeter_client_stop                           (GdmGreeterClient *client);
 
 gboolean           gdm_greeter_client_get_display_is_local           (GdmGreeterClient *client);
 
 char *             gdm_greeter_client_call_get_display_id            (GdmGreeterClient *client);
 
+void               gdm_greeter_client_call_start_conversation        (GdmGreeterClient *client,
+                                                                      const char       *service_name);
 void               gdm_greeter_client_call_begin_auto_login          (GdmGreeterClient *client,
                                                                       const char       *username);
 void               gdm_greeter_client_call_begin_verification        (GdmGreeterClient *client);
diff --git a/gui/simple-greeter/gdm-greeter-session.c b/gui/simple-greeter/gdm-greeter-session.c
index 3b89bc8..5368e61 100644
--- a/gui/simple-greeter/gdm-greeter-session.c
+++ b/gui/simple-greeter/gdm-greeter-session.c
@@ -85,6 +85,7 @@ on_problem (GdmGreeterClient  *client,
 
 static void
 on_ready (GdmGreeterClient  *client,
+          const char        *service_name,
           GdmGreeterSession *session)
 {
         g_debug ("GdmGreeterSession: Ready");
@@ -264,6 +265,7 @@ on_cancelled (GdmGreeterLoginWindow *login_window,
 {
         gdm_greeter_panel_hide_user_options (GDM_GREETER_PANEL (session->priv->panel));
         gdm_greeter_client_call_cancel (session->priv->client);
+        gdm_greeter_client_call_start_conversation (session->priv->client, "gdm");
 }
 
 static void
@@ -428,6 +430,8 @@ gdm_greeter_session_start (GdmGreeterSession *session,
         toggle_panel (session, TRUE);
         toggle_login_window (session, TRUE);
 
+        gdm_greeter_client_call_start_conversation (session->priv->client, "gdm");
+
         gdm_profile_end (NULL);
 
         return res;
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