logind: implement D-Bus properties

1 files changed, 256 insertions, 0 deletions

diff --git a/src/logind-session-dbus.c b/src/logind-session-dbus.c
new file mode 100644
index 0000000000..41af65858e
--- /dev/null
+++ b/src/logind-session-dbus.c
@@ -0,0 +1,256 @@
+/*-*- 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-session.h"
+#include "dbus-common.h"
+#include "util.h"
+
+#define BUS_SESSION_INTERFACE \
+        " <interface name=\"org.freedesktop.login1.Session\">\n"        \
+        "  <method name=\"Terminate\"/>\n"                              \
+        "  <method name=\"Activate\"/>\n"                               \
+        "  <property name=\"Id\" type=\"u\" access=\"read\"/>\n"        \
+        "  <property name=\"User\" type=\"(uo)\" access=\"read\"/>\n"   \
+        "  <property name=\"Name\" type=\"s\" access=\"read\"/>\n"      \
+        "  <property name=\"ControlGroupPath\" type=\"s\" access=\"read\"/>\n" \
+        "  <property name=\"VTNr\" type=\"u\" access=\"read\"/>\n"      \
+        "  <property name=\"Seat\" type=\"(so)\" access=\"read\"/>\n"   \
+        "  <property name=\"TTY\" type=\"s\" access=\"read\"/>\n"       \
+        "  <property name=\"Display\" type=\"s\" access=\"read\"/>\n"   \
+        "  <property name=\"Remote\" type=\"b\" access=\"read\"/>\n"    \
+        "  <property name=\"RemoteHost\" type=\"s\" access=\"read\"/>\n" \
+        "  <property name=\"RemoteUser\" type=\"s\" access=\"read\"/>\n" \
+        "  <property name=\"Leader\" type=\"u\" access=\"read\"/>\n"    \
+        "  <property name=\"Audit\" type=\"u\" access=\"read\"/>\n"     \
+        "  <property name=\"Type\" type=\"s\" access=\"read\"/>\n"      \
+        "  <property name=\"Active\" type=\"b\" access=\"read\"/>\n"    \
+        "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
+        "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
+        "  <property name=\"KillProcesses\" type=\"b\" access=\"read\"/>\n" \
+        " </interface>\n"
+
+#define INTROSPECTION                                                   \
+        DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
+        "<node>\n"                                                      \
+        BUS_SESSION_INTERFACE                                           \
+        BUS_PROPERTIES_INTERFACE                                        \
+        BUS_PEER_INTERFACE                                              \
+        BUS_INTROSPECTABLE_INTERFACE                                    \
+        "</node>\n"
+
+#define INTERFACES_LIST                              \
+        BUS_GENERIC_INTERFACES_LIST                  \
+        "org.freedesktop.login1.Session\0"
+
+static int bus_session_append_seat(DBusMessageIter *i, const char *property, void *data) {
+        DBusMessageIter sub;
+        Session *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->seat) {
+                id = s->seat->id;
+                path = p = seat_bus_path(s->seat);
+
+                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_session_append_user(DBusMessageIter *i, const char *property, void *data) {
+        DBusMessageIter sub;
+        Session *s = data;
+        char *p = NULL;
+
+        assert(i);
+        assert(property);
+        assert(s);
+
+        if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
+                return -ENOMEM;
+
+        p = user_bus_path(s->user);
+        if (!p)
+                return -ENOMEM;
+
+        if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &s->user->uid) ||
+            !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
+                free(p);
+                return -ENOMEM;
+        }
+
+        free(p);
+
+        if (!dbus_message_iter_close_container(i, &sub))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static int bus_session_append_active(DBusMessageIter *i, const char *property, void *data) {
+        Session *s = data;
+        bool b;
+
+        assert(i);
+        assert(property);
+        assert(s);
+
+        b = session_is_active(s);
+        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_type, session_type, SessionType);
+
+static int get_session_for_path(Manager *m, const char *path, Session **_s) {
+        Session *s;
+        char *id;
+
+        assert(m);
+        assert(path);
+        assert(_s);
+
+        if (!startswith(path, "/org/freedesktop/login1/session/"))
+                return -EINVAL;
+
+        id = bus_path_unescape(path + 32);
+        if (!id)
+                return -ENOMEM;
+
+        s = hashmap_get(m->sessions, id);
+        free(id);
+
+        if (!s)
+                return -ENOENT;
+
+        *_s = s;
+        return 0;
+}
+
+static DBusHandlerResult session_message_dispatch(
+                Session *s,
+                DBusConnection *connection,
+                DBusMessage *message) {
+
+        const BusProperty properties[] = {
+                { "org.freedesktop.login1.Session", "Id",               bus_property_append_string, "s",    s->id                },
+                { "org.freedesktop.login1.Session", "User",             bus_session_append_user,    "(uo)", s                    },
+                { "org.freedesktop.login1.Session", "Name",             bus_property_append_string, "s",    s->user->name        },
+                { "org.freedesktop.login1.Session", "ControlGroupPath", bus_property_append_string, "s",    s->cgroup_path       },
+                { "org.freedesktop.login1.Session", "VTNr",             bus_property_append_uint32, "u",    &s->vtnr             },
+                { "org.freedesktop.login1.Session", "Seat",             bus_session_append_seat,    "(so)", s                    },
+                { "org.freedesktop.login1.Session", "TTY",              bus_property_append_string, "s",    s->tty               },
+                { "org.freedesktop.login1.Session", "Display",          bus_property_append_string, "s",    s->display           },
+                { "org.freedesktop.login1.Session", "Remote",           bus_property_append_bool,   "b",    &s->remote           },
+                { "org.freedesktop.login1.Session", "RemoteUser",       bus_property_append_string, "s",    s->remote_user       },
+                { "org.freedesktop.login1.Session", "RemoteHost",       bus_property_append_string, "s",    s->remote_host       },
+                { "org.freedesktop.login1.Session", "Leader",           bus_property_append_pid,    "u",    &s->leader           },
+                { "org.freedesktop.login1.Session", "Audit",            bus_property_append_uint32, "u",    &s->audit_id         },
+                { "org.freedesktop.login1.Session", "Type",             bus_session_append_type,    "s",    &s->type             },
+                { "org.freedesktop.login1.Session", "Active",           bus_session_append_active,  "b",    s                    },
+                { "org.freedesktop.login1.Session", "Controllers",      bus_property_append_strv,   "as",   s->controllers       },
+                { "org.freedesktop.login1.Session", "ResetControllers", bus_property_append_strv,   "as",   s->reset_controllers },
+                { "org.freedesktop.login1.Session", "KillProcesses",    bus_property_append_bool,   "b",    &s->kill_processes   },
+                { NULL, NULL, NULL, NULL, NULL }
+        };
+
+        assert(s);
+        assert(connection);
+        assert(message);
+
+        return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
+}
+
+static DBusHandlerResult session_message_handler(
+                DBusConnection *connection,
+                DBusMessage *message,
+                void *userdata) {
+
+        Manager *m = userdata;
+        Session *s;
+        int r;
+
+        r = get_session_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 session");
+                        return bus_send_error_reply(connection, message, &e, r);
+                }
+
+                return bus_send_error_reply(connection, message, NULL, r);
+        }
+
+        return session_message_dispatch(s, connection, message);
+}
+
+const DBusObjectPathVTable bus_session_vtable = {
+        .message_function = session_message_handler
+};
+
+char *session_bus_path(Session *s) {
+        char *t, *r;
+
+        assert(s);
+
+        t = bus_path_escape(s->id);
+        if (!t)
+                return NULL;
+
+        r = strappend("/org/freedesktop/login1/session/", t);
+        free(t);
+
+        return r;
+}