logind: implement D-Bus properties

1 files changed, 218 insertions, 0 deletions

diff --git a/src/logind-seat-dbus.c b/src/logind-seat-dbus.c
new file mode 100644
index 0000000000..63b1bd5ed8
--- /dev/null
+++ b/src/logind-seat-dbus.c
@@ -0,0 +1,218 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+
+#include "logind.h"
+#include "logind-seat.h"
+#include "dbus-common.h"
+#include "util.h"
+
+#define BUS_SEAT_INTERFACE \
+        " <interface name=\"org.freedesktop.login1.Seat\">\n"           \
+        "  <method name=\"Terminate\"/>\n"                              \
+        "  <property name=\"Id\" type=\"s\" access=\"read\"/>\n"        \
+        "  <property name=\"Active\" type=\"so\" access=\"read\"/>\n"   \
+        "  <property name=\"Sessions\" type=\"a(so)\" access=\"read\"/>\n" \
+        " </interface>\n"                                               \
+
+#define INTROSPECTION                                                   \
+        DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
+        "<node>\n"                                                      \
+        BUS_SEAT_INTERFACE                                              \
+        BUS_PROPERTIES_INTERFACE                                        \
+        BUS_PEER_INTERFACE                                              \
+        BUS_INTROSPECTABLE_INTERFACE                                    \
+        "</node>\n"
+
+#define INTERFACES_LIST                              \
+        BUS_GENERIC_INTERFACES_LIST                  \
+        "org.freedesktop.login1.Seat\0"
+
+static int bus_seat_append_active(DBusMessageIter *i, const char *property, void *data) {
+        DBusMessageIter sub;
+        Seat *s = data;
+        const char *id, *path;
+        char *p = NULL;
+
+        assert(i);
+        assert(property);
+        assert(s);
+
+        if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
+                return -ENOMEM;
+
+        if (s->active) {
+                id = s->active->id;
+                path = p = session_bus_path(s->active);
+
+                if (!p)
+                        return -ENOMEM;
+        } else {
+                id = "";
+                path = "/";
+        }
+
+        if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) ||
+            !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &path)) {
+                free(p);
+                return -ENOMEM;
+        }
+
+        free(p);
+
+        if (!dbus_message_iter_close_container(i, &sub))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static int bus_seat_append_sessions(DBusMessageIter *i, const char *property, void *data) {
+        DBusMessageIter sub, sub2;
+        Seat *s = data;
+        Session *session;
+
+        assert(i);
+        assert(property);
+        assert(s);
+
+        if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "so", &sub))
+                return -ENOMEM;
+
+        LIST_FOREACH(sessions_by_seat, session, s->sessions) {
+                char *p;
+
+                if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
+                        return -ENOMEM;
+
+                p = session_bus_path(session);
+                if (!p)
+                        return -ENOMEM;
+
+                if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
+                    !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
+                        free(p);
+                        return -ENOMEM;
+                }
+
+                free(p);
+
+                if (!dbus_message_iter_close_container(&sub, &sub2))
+                        return -ENOMEM;
+        }
+
+        if (!dbus_message_iter_close_container(i, &sub))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static int get_seat_for_path(Manager *m, const char *path, Seat **_s) {
+        Seat *s;
+        char *id;
+
+        assert(m);
+        assert(path);
+        assert(_s);
+
+        if (!startswith(path, "/org/freedesktop/login1/seat/"))
+                return -EINVAL;
+
+        id = bus_path_unescape(path + 29);
+        if (!id)
+                return -ENOMEM;
+
+        s = hashmap_get(m->seats, id);
+        free(id);
+
+        if (!s)
+                return -ENOENT;
+
+        *_s = s;
+        return 0;
+}
+
+static DBusHandlerResult seat_message_dispatch(
+                Seat *s,
+                DBusConnection *connection,
+                DBusMessage *message) {
+
+        const BusProperty properties[] = {
+                { "org.freedesktop.login1.Seat", "Id",       bus_property_append_string, "s",     s->id },
+                { "org.freedesktop.login1.Seat", "Active",   bus_seat_append_active,     "(so)",  s     },
+                { "org.freedesktop.login1.Seat", "Sessions", bus_seat_append_sessions,   "a(so)", s     },
+                { NULL, NULL, NULL, NULL, NULL }
+        };
+
+        assert(s);
+        assert(connection);
+        assert(message);
+
+        return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
+}
+
+static DBusHandlerResult seat_message_handler(
+                DBusConnection *connection,
+                DBusMessage *message,
+                void *userdata) {
+
+        Manager *m = userdata;
+        Seat *s;
+        int r;
+
+        r = get_seat_for_path(m, dbus_message_get_path(message), &s);
+        if (r < 0) {
+
+                if (r == -ENOMEM)
+                        return DBUS_HANDLER_RESULT_NEED_MEMORY;
+
+                if (r == -ENOENT) {
+                        DBusError e;
+
+                        dbus_error_init(&e);
+                        dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown seat");
+                        return bus_send_error_reply(connection, message, &e, r);
+                }
+
+                return bus_send_error_reply(connection, message, NULL, r);
+        }
+
+        return seat_message_dispatch(s, connection, message);
+}
+
+const DBusObjectPathVTable bus_seat_vtable = {
+        .message_function = seat_message_handler
+};
+
+char *seat_bus_path(Seat *s) {
+        char *t, *r;
+
+        assert(s);
+
+        t = bus_path_escape(s->id);
+        if (!t)
+                return NULL;
+
+        r = strappend("/org/freedesktop/login1/seat/", t);
+        free(t);
+
+        return r;
+}