src/core/dbus-job.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include "sd-bus.h"
  23
  24 #include "dbus.h"
  25 #include "job.h"
  26 #include "log.h"
  27 #include "selinux-access.h"
  28 #include "string-util.h"
  29 #include "dbus-job.h"
  30
  31 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, job_type, JobType);
  32 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_state, job_state, JobState);
  33
  34 static int property_get_unit(
  35                 sd_bus *bus,
  36                 const char *path,
  37                 const char *interface,
  38                 const char *property,
  39                 sd_bus_message *reply,
  40                 void *userdata,
  41                 sd_bus_error *error) {
  42
  43         _cleanup_free_ char *p = NULL;
  44         Job *j = userdata;
  45
  46         assert(bus);
  47         assert(reply);
  48         assert(j);
  49
  50         p = unit_dbus_path(j->unit);
  51         if (!p)
  52                 return -ENOMEM;
  53
  54         return sd_bus_message_append(reply, "(so)", j->unit->id, p);
  55 }
  56
  57 int bus_job_method_cancel(sd_bus_message *message, void *userdata, sd_bus_error *error) {
  58         Job *j = userdata;
  59         int r;
  60
  61         assert(message);
  62         assert(j);
  63
  64         r = mac_selinux_unit_access_check(j->unit, message, "stop", error);
  65         if (r < 0)
  66                 return r;
  67
  68         /* Access is granted to the job owner */
  69         if (!sd_bus_track_contains(j->clients, sd_bus_message_get_sender(message))) {
  70
  71                 /* And for everybody else consult PolicyKit */
  72                 r = bus_verify_manage_units_async(j->unit->manager, message, error);
  73                 if (r < 0)
  74                         return r;
  75                 if (r == 0)
  76                         return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
  77         }
  78
  79         job_finish_and_invalidate(j, JOB_CANCELED, true);
  80
  81         return sd_bus_reply_method_return(message, NULL);
  82 }
  83
  84 const sd_bus_vtable bus_job_vtable[] = {
  85         SD_BUS_VTABLE_START(0),
  86         SD_BUS_METHOD("Cancel", NULL, NULL, bus_job_method_cancel, SD_BUS_VTABLE_UNPRIVILEGED),
  87         SD_BUS_PROPERTY("Id", "u", NULL, offsetof(Job, id), SD_BUS_VTABLE_PROPERTY_CONST),
  88         SD_BUS_PROPERTY("Unit", "(so)", property_get_unit, 0, SD_BUS_VTABLE_PROPERTY_CONST),
  89         SD_BUS_PROPERTY("JobType", "s", property_get_type, offsetof(Job, type), SD_BUS_VTABLE_PROPERTY_CONST),
  90         SD_BUS_PROPERTY("State", "s", property_get_state, offsetof(Job, state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  91         SD_BUS_VTABLE_END
  92 };
  93
  94 static int send_new_signal(sd_bus *bus, void *userdata) {
  95         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
  96         _cleanup_free_ char *p = NULL;
  97         Job *j = userdata;
  98         int r;
  99
 100         assert(bus);
 101         assert(j);
 102
 103         p = job_dbus_path(j);
 104         if (!p)
 105                 return -ENOMEM;
 106
 107         r = sd_bus_message_new_signal(
 108                         bus,
 109                         &m,
 110                         "/org/freedesktop/systemd1",
 111                         "org.freedesktop.systemd1.Manager",
 112                         "JobNew");
 113         if (r < 0)
 114                 return r;
 115
 116         r = sd_bus_message_append(m, "uos", j->id, p, j->unit->id);
 117         if (r < 0)
 118                 return r;
 119
 120         return sd_bus_send(bus, m, NULL);
 121 }
 122
 123 static int send_changed_signal(sd_bus *bus, void *userdata) {
 124         _cleanup_free_ char *p = NULL;
 125         Job *j = userdata;
 126
 127         assert(bus);
 128         assert(j);
 129
 130         p = job_dbus_path(j);
 131         if (!p)
 132                 return -ENOMEM;
 133
 134         return sd_bus_emit_properties_changed(bus, p, "org.freedesktop.systemd1.Job", "State", NULL);
 135 }
 136
 137 void bus_job_send_change_signal(Job *j) {
 138         int r;
 139
 140         assert(j);
 141
 142         if (j->in_dbus_queue) {
 143                 LIST_REMOVE(dbus_queue, j->manager->dbus_job_queue, j);
 144                 j->in_dbus_queue = false;
 145         }
 146
 147         r = bus_foreach_bus(j->manager, j->clients, j->sent_dbus_new_signal ? send_changed_signal : send_new_signal, j);
 148         if (r < 0)
 149                 log_debug_errno(r, "Failed to send job change signal for %u: %m", j->id);
 150
 151         j->sent_dbus_new_signal = true;
 152 }
 153
 154 static int send_removed_signal(sd_bus *bus, void *userdata) {
 155         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 156         _cleanup_free_ char *p = NULL;
 157         Job *j = userdata;
 158         int r;
 159
 160         assert(bus);
 161         assert(j);
 162
 163         p = job_dbus_path(j);
 164         if (!p)
 165                 return -ENOMEM;
 166
 167         r = sd_bus_message_new_signal(
 168                         bus,
 169                         &m,
 170                         "/org/freedesktop/systemd1",
 171                         "org.freedesktop.systemd1.Manager",
 172                         "JobRemoved");
 173         if (r < 0)
 174                 return r;
 175
 176         r = sd_bus_message_append(m, "uoss", j->id, p, j->unit->id, job_result_to_string(j->result));
 177         if (r < 0)
 178                 return r;
 179
 180         return sd_bus_send(bus, m, NULL);
 181 }
 182
 183 void bus_job_send_removed_signal(Job *j) {
 184         int r;
 185
 186         assert(j);
 187
 188         if (!j->sent_dbus_new_signal)
 189                 bus_job_send_change_signal(j);
 190
 191         r = bus_foreach_bus(j->manager, j->clients, send_removed_signal, j);
 192         if (r < 0)
 193                 log_debug_errno(r, "Failed to send job remove signal for %u: %m", j->id);
 194 }