Systemd/src/core/dbus-job.c

309 lines
9.3 KiB
C

/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "sd-bus.h"
#include "alloc-util.h"
#include "dbus-job.h"
#include "dbus.h"
#include "job.h"
#include "log.h"
#include "selinux-access.h"
#include "string-util.h"
static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, job_type, JobType);
static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_state, job_state, JobState);
static int property_get_unit(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
_cleanup_free_ char *p = NULL;
Job *j = userdata;
assert(bus);
assert(reply);
assert(j);
p = unit_dbus_path(j->unit);
if (!p)
return -ENOMEM;
return sd_bus_message_append(reply, "(so)", j->unit->id, p);
}
int bus_job_method_cancel(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Job *j = userdata;
int r;
assert(message);
assert(j);
r = mac_selinux_unit_access_check(j->unit, message, "stop", error);
if (r < 0)
return r;
/* Access is granted to the job owner */
if (!sd_bus_track_contains(j->bus_track, sd_bus_message_get_sender(message))) {
/* And for everybody else consult PolicyKit */
r = bus_verify_manage_units_async(j->unit->manager, message, error);
if (r < 0)
return r;
if (r == 0)
return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
}
job_finish_and_invalidate(j, JOB_CANCELED, true, false);
return sd_bus_reply_method_return(message, NULL);
}
int bus_job_method_get_waiting_jobs(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_free_ Job **list = NULL;
Job *j = userdata;
int r, i, n;
if (strstr(sd_bus_message_get_member(message), "After"))
n = job_get_after(j, &list);
else
n = job_get_before(j, &list);
if (n < 0)
return n;
r = sd_bus_message_new_method_return(message, &reply);
if (r < 0)
return r;
r = sd_bus_message_open_container(reply, 'a', "(usssoo)");
if (r < 0)
return r;
for (i = 0; i < n; i ++) {
_cleanup_free_ char *unit_path = NULL, *job_path = NULL;
job_path = job_dbus_path(list[i]);
if (!job_path)
return -ENOMEM;
unit_path = unit_dbus_path(list[i]->unit);
if (!unit_path)
return -ENOMEM;
r = sd_bus_message_append(reply, "(usssoo)",
list[i]->id,
list[i]->unit->id,
job_type_to_string(list[i]->type),
job_state_to_string(list[i]->state),
job_path,
unit_path);
if (r < 0)
return r;
}
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
const sd_bus_vtable bus_job_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_METHOD("Cancel", NULL, NULL, bus_job_method_cancel, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetAfter", NULL, "a(usssoo)", bus_job_method_get_waiting_jobs, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetBefore", NULL, "a(usssoo)", bus_job_method_get_waiting_jobs, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_PROPERTY("Id", "u", NULL, offsetof(Job, id), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Unit", "(so)", property_get_unit, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("JobType", "s", property_get_type, offsetof(Job, type), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("State", "s", property_get_state, offsetof(Job, state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_VTABLE_END
};
static int send_new_signal(sd_bus *bus, void *userdata) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
_cleanup_free_ char *p = NULL;
Job *j = userdata;
int r;
assert(bus);
assert(j);
p = job_dbus_path(j);
if (!p)
return -ENOMEM;
r = sd_bus_message_new_signal(
bus,
&m,
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"JobNew");
if (r < 0)
return r;
r = sd_bus_message_append(m, "uos", j->id, p, j->unit->id);
if (r < 0)
return r;
return sd_bus_send(bus, m, NULL);
}
static int send_changed_signal(sd_bus *bus, void *userdata) {
_cleanup_free_ char *p = NULL;
Job *j = userdata;
assert(bus);
assert(j);
p = job_dbus_path(j);
if (!p)
return -ENOMEM;
return sd_bus_emit_properties_changed(bus, p, "org.freedesktop.systemd1.Job", "State", NULL);
}
void bus_job_send_change_signal(Job *j) {
int r;
assert(j);
if (j->in_dbus_queue) {
LIST_REMOVE(dbus_queue, j->manager->dbus_job_queue, j);
j->in_dbus_queue = false;
}
r = bus_foreach_bus(j->manager, j->bus_track, j->sent_dbus_new_signal ? send_changed_signal : send_new_signal, j);
if (r < 0)
log_debug_errno(r, "Failed to send job change signal for %u: %m", j->id);
j->sent_dbus_new_signal = true;
}
static int send_removed_signal(sd_bus *bus, void *userdata) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
_cleanup_free_ char *p = NULL;
Job *j = userdata;
int r;
assert(bus);
assert(j);
p = job_dbus_path(j);
if (!p)
return -ENOMEM;
r = sd_bus_message_new_signal(
bus,
&m,
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"JobRemoved");
if (r < 0)
return r;
r = sd_bus_message_append(m, "uoss", j->id, p, j->unit->id, job_result_to_string(j->result));
if (r < 0)
return r;
return sd_bus_send(bus, m, NULL);
}
void bus_job_send_removed_signal(Job *j) {
int r;
assert(j);
if (!j->sent_dbus_new_signal)
bus_job_send_change_signal(j);
r = bus_foreach_bus(j->manager, j->bus_track, send_removed_signal, j);
if (r < 0)
log_debug_errno(r, "Failed to send job remove signal for %u: %m", j->id);
}
static int bus_job_track_handler(sd_bus_track *t, void *userdata) {
Job *j = userdata;
assert(t);
assert(j);
j->bus_track = sd_bus_track_unref(j->bus_track); /* make sure we aren't called again */
/* Last client dropped off the bus, maybe we should GC this now? */
job_add_to_gc_queue(j);
return 0;
}
static int bus_job_allocate_bus_track(Job *j) {
assert(j);
if (j->bus_track)
return 0;
return sd_bus_track_new(j->unit->manager->api_bus, &j->bus_track, bus_job_track_handler, j);
}
int bus_job_coldplug_bus_track(Job *j) {
int r = 0;
_cleanup_strv_free_ char **deserialized_clients = NULL;
assert(j);
deserialized_clients = TAKE_PTR(j->deserialized_clients);
if (strv_isempty(deserialized_clients))
return 0;
if (!j->manager->api_bus)
return 0;
r = bus_job_allocate_bus_track(j);
if (r < 0)
return r;
return bus_track_add_name_many(j->bus_track, deserialized_clients);
}
int bus_job_track_sender(Job *j, sd_bus_message *m) {
int r;
assert(j);
assert(m);
if (sd_bus_message_get_bus(m) != j->unit->manager->api_bus) {
j->ref_by_private_bus = true;
return 0;
}
r = bus_job_allocate_bus_track(j);
if (r < 0)
return r;
return sd_bus_track_add_sender(j->bus_track, m);
}