91ab7b01f8
If we have a lot of simultaneous sessions we really shouldn't send the full list of active sessions with each PropertyChanged message for user and seat objects, as that can become quite substantial data, we probably shouldn't dump on the bus on each login and logout. Note that the global list of sessions doesn't send out changes like this either, it only supports requesting the session list with ListSessions(). If cients want to get notified about sessions coming and going they should subscribe to SessionNew and SessionRemoved signals, and clients generally do that already. This is kind of an API break, but then again the fact that this was included was never documented.
475 lines
14 KiB
C
475 lines
14 KiB
C
/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <string.h>
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#include "alloc-util.h"
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#include "bus-common-errors.h"
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#include "bus-label.h"
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#include "bus-util.h"
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#include "logind-seat.h"
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#include "logind.h"
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#include "strv.h"
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#include "user-util.h"
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#include "util.h"
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static int property_get_active_session(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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_cleanup_free_ char *p = NULL;
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Seat *s = userdata;
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assert(bus);
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assert(reply);
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assert(s);
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p = s->active ? session_bus_path(s->active) : strdup("/");
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if (!p)
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return -ENOMEM;
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return sd_bus_message_append(reply, "(so)", s->active ? s->active->id : "", p);
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}
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static int property_get_can_multi_session(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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assert(bus);
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assert(reply);
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assert(s);
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return sd_bus_message_append(reply, "b", seat_can_multi_session(s));
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}
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static int property_get_can_tty(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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assert(bus);
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assert(reply);
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assert(s);
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return sd_bus_message_append(reply, "b", seat_can_tty(s));
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}
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static int property_get_can_graphical(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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assert(bus);
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assert(reply);
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assert(s);
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return sd_bus_message_append(reply, "b", seat_can_graphical(s));
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}
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static int property_get_sessions(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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Session *session;
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int r;
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assert(bus);
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assert(reply);
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assert(s);
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r = sd_bus_message_open_container(reply, 'a', "(so)");
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if (r < 0)
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return r;
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LIST_FOREACH(sessions_by_seat, session, s->sessions) {
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_cleanup_free_ char *p = NULL;
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p = session_bus_path(session);
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if (!p)
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return -ENOMEM;
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r = sd_bus_message_append(reply, "(so)", session->id, p);
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if (r < 0)
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return r;
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}
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r = sd_bus_message_close_container(reply);
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if (r < 0)
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return r;
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return 1;
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}
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static int property_get_idle_hint(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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assert(bus);
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assert(reply);
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assert(s);
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return sd_bus_message_append(reply, "b", seat_get_idle_hint(s, NULL) > 0);
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}
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static int property_get_idle_since_hint(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Seat *s = userdata;
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dual_timestamp t;
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uint64_t u;
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int r;
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assert(bus);
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assert(reply);
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assert(s);
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r = seat_get_idle_hint(s, &t);
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if (r < 0)
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return r;
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u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
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return sd_bus_message_append(reply, "t", u);
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}
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int bus_seat_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Seat *s = userdata;
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int r;
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assert(message);
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assert(s);
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r = bus_verify_polkit_async(
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message,
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CAP_KILL,
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"org.freedesktop.login1.manage",
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NULL,
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false,
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UID_INVALID,
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&s->manager->polkit_registry,
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error);
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if (r < 0)
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return r;
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if (r == 0)
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return 1; /* Will call us back */
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r = seat_stop_sessions(s, true);
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if (r < 0)
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return r;
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return sd_bus_reply_method_return(message, NULL);
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}
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static int method_activate_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Seat *s = userdata;
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const char *name;
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Session *session;
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int r;
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assert(message);
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assert(s);
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r = sd_bus_message_read(message, "s", &name);
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if (r < 0)
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return r;
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session = hashmap_get(s->manager->sessions, name);
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if (!session)
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return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
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if (session->seat != s)
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return sd_bus_error_setf(error, BUS_ERROR_SESSION_NOT_ON_SEAT, "Session %s not on seat %s", name, s->id);
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r = session_activate(session);
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if (r < 0)
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return r;
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return sd_bus_reply_method_return(message, NULL);
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}
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static int method_switch_to(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Seat *s = userdata;
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unsigned int to;
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int r;
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assert(message);
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assert(s);
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r = sd_bus_message_read(message, "u", &to);
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if (r < 0)
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return r;
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if (to <= 0)
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return -EINVAL;
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r = seat_switch_to(s, to);
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if (r < 0)
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return r;
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return sd_bus_reply_method_return(message, NULL);
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}
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static int method_switch_to_next(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Seat *s = userdata;
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int r;
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assert(message);
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assert(s);
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r = seat_switch_to_next(s);
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if (r < 0)
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return r;
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return sd_bus_reply_method_return(message, NULL);
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}
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static int method_switch_to_previous(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Seat *s = userdata;
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int r;
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assert(message);
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assert(s);
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r = seat_switch_to_previous(s);
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if (r < 0)
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return r;
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return sd_bus_reply_method_return(message, NULL);
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}
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const sd_bus_vtable seat_vtable[] = {
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SD_BUS_VTABLE_START(0),
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SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Seat, id), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("ActiveSession", "(so)", property_get_active_session, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_PROPERTY("CanMultiSession", "b", property_get_can_multi_session, 0, SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("CanTTY", "b", property_get_can_tty, 0, SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("CanGraphical", "b", property_get_can_graphical, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0),
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SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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SD_BUS_METHOD("Terminate", NULL, NULL, bus_seat_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD("ActivateSession", "s", NULL, method_activate_session, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD("SwitchTo", "u", NULL, method_switch_to, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD("SwitchToNext", NULL, NULL, method_switch_to_next, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD("SwitchToPrevious", NULL, NULL, method_switch_to_previous, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_VTABLE_END
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};
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int seat_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
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Manager *m = userdata;
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Seat *seat;
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int r;
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assert(bus);
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assert(path);
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assert(interface);
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assert(found);
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assert(m);
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if (streq(path, "/org/freedesktop/login1/seat/self")) {
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_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
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sd_bus_message *message;
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Session *session;
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const char *name;
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message = sd_bus_get_current_message(bus);
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if (!message)
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return 0;
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r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT, &creds);
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if (r < 0)
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return r;
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r = sd_bus_creds_get_session(creds, &name);
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if (r < 0)
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return r;
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session = hashmap_get(m->sessions, name);
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if (!session)
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return 0;
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seat = session->seat;
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} else {
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_cleanup_free_ char *e = NULL;
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const char *p;
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p = startswith(path, "/org/freedesktop/login1/seat/");
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if (!p)
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return 0;
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e = bus_label_unescape(p);
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if (!e)
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return -ENOMEM;
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seat = hashmap_get(m->seats, e);
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}
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if (!seat)
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return 0;
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*found = seat;
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return 1;
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}
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char *seat_bus_path(Seat *s) {
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_cleanup_free_ char *t = NULL;
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assert(s);
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t = bus_label_escape(s->id);
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if (!t)
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return NULL;
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return strappend("/org/freedesktop/login1/seat/", t);
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}
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int seat_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
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_cleanup_strv_free_ char **l = NULL;
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sd_bus_message *message;
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Manager *m = userdata;
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Seat *seat;
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Iterator i;
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int r;
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assert(bus);
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assert(path);
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assert(nodes);
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HASHMAP_FOREACH(seat, m->seats, i) {
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char *p;
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p = seat_bus_path(seat);
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if (!p)
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return -ENOMEM;
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r = strv_consume(&l, p);
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if (r < 0)
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return r;
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}
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message = sd_bus_get_current_message(bus);
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if (message) {
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_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
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const char *name;
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Session *session;
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r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT, &creds);
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if (r >= 0) {
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r = sd_bus_creds_get_session(creds, &name);
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if (r >= 0) {
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session = hashmap_get(m->sessions, name);
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if (session && session->seat) {
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r = strv_extend(&l, "/org/freedesktop/login1/seat/self");
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if (r < 0)
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return r;
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}
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}
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}
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}
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*nodes = l;
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l = NULL;
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return 1;
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}
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int seat_send_signal(Seat *s, bool new_seat) {
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_cleanup_free_ char *p = NULL;
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assert(s);
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p = seat_bus_path(s);
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if (!p)
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return -ENOMEM;
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return sd_bus_emit_signal(
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s->manager->bus,
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"/org/freedesktop/login1",
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"org.freedesktop.login1.Manager",
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new_seat ? "SeatNew" : "SeatRemoved",
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"so", s->id, p);
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}
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int seat_send_changed(Seat *s, const char *properties, ...) {
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_cleanup_free_ char *p = NULL;
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char **l;
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assert(s);
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if (!s->started)
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return 0;
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p = seat_bus_path(s);
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if (!p)
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return -ENOMEM;
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l = strv_from_stdarg_alloca(properties);
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return sd_bus_emit_properties_changed_strv(s->manager->bus, p, "org.freedesktop.login1.Seat", l);
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}
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