logind: implement D-Bus properties

1 files changed, 235 insertions, 0 deletions

diff --git a/src/logind-dbus.c b/src/logind-dbus.c
new file mode 100644
index 0000000000..90db94184f
--- /dev/null
+++ b/src/logind-dbus.c
@@ -0,0 +1,235 @@
+/*-*- 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 "logind.h"
+#include "dbus-common.h"
+
+#define BUS_MANAGER_INTERFACE                                           \
+        " <interface name=\"org.freedesktop.login1.Manager\">\n"        \
+        "  <method name=\"GetSeat\">\n"                                 \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "   <arg name=\"seat\" type=\"o\" direction=\"out\"/>\n"        \
+        "  </method>\n"                                                 \
+        "  <method name=\"GetUser\">\n"                                 \
+        "   <arg name=\"uid\" type=\"t\" direction=\"in\"/>\n"          \
+        "   <arg name=\"user\" type=\"o\" direction=\"out\"/>\n"        \
+        "  </method>\n"                                                 \
+        "  <method name=\"GetSession\">\n"                              \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "   <arg name=\"session\" type=\"o\" direction=\"out\"/>\n"     \
+        "  </method>\n"                                                 \
+        "  <method name=\"ListSeats\">\n"                               \
+        "   <arg name=\"seats\" type=\"a(so)\" direction=\"out\"/>\n"   \
+        "  </method>\n"                                                 \
+        "  <method name=\"ListUsers\">\n"                               \
+        "   <arg name=\"users\" type=\"a(uso)\" direction=\"out\"/>\n"  \
+        "  </method>\n"                                                 \
+        "  <method name=\"ListSessions\">\n"                            \
+        "   <arg name=\"users\" type=\"a(sussso)\" direction=\"out\"/>\n" \
+        "  </method>\n"                                                 \
+        "  <method name=\"CreateSession\">\n"                           \
+        "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
+        "   <arg name=\"leader\" type=\"u\" direction=\"in\"/>\n"       \
+        "   <arg name=\"type\" type=\"s\" direction=\"in\"/>\n"         \
+        "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
+        "   <arg name=\"tty\" type=\"s\" direction=\"in\"/>\n"          \
+        "   <arg name=\"display\" type=\"s\" direction=\"in\"/>\n"      \
+        "   <arg name=\"remote\" type=\"b\" direction=\"in\"/>\n"       \
+        "   <arg name=\"remote_user\" type=\"s\" direction=\"in\"/>\n"  \
+        "   <arg name=\"remote_host\" type=\"s\" direction=\"in\"/>\n"  \
+        "   <arg name=\"controllers\" type=\"as\" direction=\"in\"/>\n" \
+        "   <arg name=\"reset_controllers\" type=\"as\" direction=\"in\"/>\n" \
+        "   <arg name=\"kill_processes\" type=\"as\" direction=\"in\"/>\n" \
+        "   <arg name=\"id\" type=\"s\" direction=\"out\"/>\n"          \
+        "   <arg name=\"path\" type=\"o\" direction=\"out\"/>\n"        \
+        "   <arg name=\"fd\" type=\"h\" direction=\"out\"/>\n"          \
+        "  </method>\n"                                                 \
+        "  <method name=\"TerminateSession\">\n"                        \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "  </method>\n"                                                 \
+        "  <method name=\"TerminateUser\">\n"                           \
+        "   <arg name=\"uid\" type=\"t\" direction=\"in\"/>\n"          \
+        "  </method>\n"                                                 \
+        "  <method name=\"TerminateSeat\">\n"                           \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "  </method>\n"                                                 \
+        "  <signal name=\"SessionNew\">\n"                              \
+        "   <arg name=\"id\" type=\"s\"/>\n"                            \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"SessionRemoved\">\n"                          \
+        "   <arg name=\"id\" type=\"s\"/>\n"                            \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"UserNew\">\n"                                 \
+        "   <arg name=\"uid\" type=\"u\"/>\n"                           \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"UserRemoved\">\n"                             \
+        "   <arg name=\"uid\" type=\"u\"/>\n"                           \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"SeatNew\">\n"                                 \
+        "   <arg name=\"id\" type=\"s\"/>\n"                            \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"SeatRemoved\">\n"                             \
+        "   <arg name=\"id\" type=\"s\"/>\n"                            \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <property name=\"ControlGroupHierarchy\" type=\"s\" access=\"read\"/>\n" \
+        "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
+        "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
+        "  <property name=\"NAutoVTs\" type=\"u\" access=\"read\"/>\n" \
+        "  <property name=\"KillOnlyUsers\" type=\"as\" access=\"read\"/>\n" \
+        "  <property name=\"KillExcludeUsers\" type=\"as\" access=\"read\"/>\n" \
+        "  <property name=\"KillUserProcesses\" type=\"b\" access=\"read\"/>\n" \
+        " </interface>\n"
+
+#define INTROSPECTION_BEGIN                                             \
+        DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
+        "<node>\n"                                                      \
+        BUS_MANAGER_INTERFACE                                           \
+        BUS_PROPERTIES_INTERFACE                                        \
+        BUS_PEER_INTERFACE                                              \
+        BUS_INTROSPECTABLE_INTERFACE
+
+#define INTROSPECTION_END                                               \
+        "</node>\n"
+
+#define INTERFACES_LIST                              \
+        BUS_GENERIC_INTERFACES_LIST                  \
+        "org.freedesktop.login1.Manager\0"
+
+static DBusHandlerResult manager_message_handler(
+                DBusConnection *connection,
+                DBusMessage *message,
+                void *userdata) {
+
+        Manager *m = userdata;
+
+        const BusProperty properties[] = {
+                { "org.freedesktop.login1.Manager", "ControlGroupHierarchy", bus_property_append_string,   "s",  m->cgroup_path          },
+                { "org.freedesktop.login1.Manager", "Controllers",           bus_property_append_strv,     "as", m->controllers          },
+                { "org.freedesktop.login1.Manager", "ResetControllers",      bus_property_append_strv,     "as", m->reset_controllers    },
+                { "org.freedesktop.login1.Manager", "NAutoVTs",              bus_property_append_unsigned, "u",  &m->n_autovts           },
+                { "org.freedesktop.login1.Manager", "KillOnlyUsers",         bus_property_append_strv,     "as", m->kill_only_users      },
+                { "org.freedesktop.login1.Manager", "KillExcludeUsers",      bus_property_append_strv,     "as", m->kill_exclude_users   },
+                { "org.freedesktop.login1.Manager", "KillUserProcesses",     bus_property_append_bool,     "b",  &m->kill_user_processes },
+                { NULL, NULL, NULL, NULL, NULL }
+        };
+
+        DBusError error;
+        DBusMessage *reply = NULL;
+
+        assert(connection);
+        assert(message);
+        assert(m);
+
+        dbus_error_init(&error);
+
+        if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
+                char *introspection = NULL;
+                FILE *f;
+                Iterator i;
+                Session *session;
+                Seat *seat;
+                User *user;
+                size_t size;
+                char *p;
+
+                if (!(reply = dbus_message_new_method_return(message)))
+                        goto oom;
+
+                /* We roll our own introspection code here, instead of
+                 * relying on bus_default_message_handler() because we
+                 * need to generate our introspection string
+                 * dynamically. */
+
+                if (!(f = open_memstream(&introspection, &size)))
+                        goto oom;
+
+                fputs(INTROSPECTION_BEGIN, f);
+
+                HASHMAP_FOREACH(seat, m->seats, i) {
+                        p = bus_path_escape(seat->id);
+
+                        if (p) {
+                                fprintf(f, "<node name=\"seat/%s\"/>", p);
+                                free(p);
+                        }
+                }
+
+                HASHMAP_FOREACH(user, m->users, i)
+                        fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
+
+                HASHMAP_FOREACH(session, m->sessions, i) {
+                        p = bus_path_escape(session->id);
+
+                        if (p) {
+                                fprintf(f, "<node name=\"session/%s\"/>", p);
+                                free(p);
+                        }
+                }
+
+                fputs(INTROSPECTION_END, f);
+
+                if (ferror(f)) {
+                        fclose(f);
+                        free(introspection);
+                        goto oom;
+                }
+
+                fclose(f);
+
+                if (!introspection)
+                        goto oom;
+
+                if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
+                        free(introspection);
+                        goto oom;
+                }
+
+                free(introspection);
+        } else
+                return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
+
+        if (reply) {
+                if (!dbus_connection_send(connection, reply, NULL))
+                        goto oom;
+
+                dbus_message_unref(reply);
+        }
+
+        return DBUS_HANDLER_RESULT_HANDLED;
+
+oom:
+        if (reply)
+                dbus_message_unref(reply);
+
+        dbus_error_free(&error);
+
+        return DBUS_HANDLER_RESULT_NEED_MEMORY;
+}
+
+const DBusObjectPathVTable bus_manager_vtable = {
+        .message_function = manager_message_handler
+};