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 "log.h"
  23 #include "sd-bus.h"
  24 #include "selinux-access.h"
  25 #include "job.h"
  26 #include "dbus-job.h"
  27 #include "dbus-client-track.h"
  28
  29 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, job_type, JobType);
  30 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_state, job_state, JobState);
  31
  32 static int property_get_unit(
  33                 sd_bus *bus,
  34                 const char *path,
  35                 const char *interface,
  36                 const char *property,
  37                 sd_bus_message *reply,
  38                 void *userdata,
  39                 sd_bus_error *error) {
  40
  41         _cleanup_free_ char *p = NULL;
  42         Job *j = userdata;
  43
  44         assert(bus);
  45         assert(reply);
  46         assert(j);
  47
  48         p = unit_dbus_path(j->unit);
  49         if (!p)
  50                 return -ENOMEM;
  51
  52         return sd_bus_message_append(reply, "(so)", j->unit->id, p);
  53 }
  54
  55 static int method_cancel(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
  56         Job *j = userdata;
  57         int r;
  58
  59         assert(bus);
  60         assert(message);
  61         assert(j);
  62
  63         r = selinux_unit_access_check(j->unit, bus, message, "stop", error);
  64         if (r < 0)
  65                 return r;
  66
  67         job_finish_and_invalidate(j, JOB_CANCELED, true);
  68
  69         return sd_bus_reply_method_return(message, NULL);
  70 }
  71
  72 const sd_bus_vtable bus_job_vtable[] = {
  73         SD_BUS_VTABLE_START(0),
  74         SD_BUS_METHOD("Cancel", NULL, NULL, method_cancel, 0),
  75         SD_BUS_PROPERTY("Id", "u", NULL, offsetof(Job, id), SD_BUS_VTABLE_PROPERTY_CONST),
  76         SD_BUS_PROPERTY("Unit", "(so)", property_get_unit, 0, SD_BUS_VTABLE_PROPERTY_CONST),
  77         SD_BUS_PROPERTY("JobType", "s", property_get_type, offsetof(Job, type), SD_BUS_VTABLE_PROPERTY_CONST),
  78         SD_BUS_PROPERTY("State", "s", property_get_state, offsetof(Job, state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  79         SD_BUS_VTABLE_END
  80 };
  81
  82 static int foreach_client(Job *j, int (*send_message)(sd_bus *bus, const char *name, Job *j)) {
  83         BusTrackedClient *one_destination = NULL;
  84         Iterator i;
  85         sd_bus *b;
  86         unsigned n, m;
  87         int r, ret;
  88
  89         assert(j);
  90         assert(send_message);
  91
  92         n = set_size(j->manager->subscribed);
  93         m = set_size(j->subscribed);
  94
  95         if (n <= 0 && m <= 0)
  96                 return 0;
  97
  98         if (n == 1 && m == 0)
  99                 one_destination = set_first(j->manager->subscribed);
 100         else if (n == 0 && m == 1)
 101                 one_destination = set_first(j->subscribed);
 102         else
 103                 one_destination = NULL;
 104
 105         if (one_destination)
 106                 return send_message(one_destination->bus, isempty(one_destination->name) ? NULL : one_destination->name, j);
 107
 108         ret = 0;
 109
 110         /* Send to everybody */
 111         SET_FOREACH(b, j->manager->private_buses, i) {
 112                 r = send_message(b, NULL, j);
 113                 if (r < 0)
 114                         ret = r;
 115         }
 116
 117         if (j->manager->api_bus) {
 118                 r = send_message(j->manager->api_bus, NULL, j);
 119                 if (r < 0)
 120                         ret = r;
 121         }
 122
 123         return ret;
 124 }
 125
 126 static int send_new_signal(sd_bus *bus, const char *destination, Job *j) {
 127         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 128         _cleanup_free_ char *p = NULL;
 129         int r;
 130
 131         assert(bus);
 132         assert(j);
 133
 134         p = job_dbus_path(j);
 135         if (!p)
 136                 return -ENOMEM;
 137
 138         r = sd_bus_message_new_signal(
 139                         bus,
 140                         &m,
 141                         "/org/freedesktop/systemd1",
 142                         "org.freedesktop.systemd1.Manager",
 143                         "JobNew");
 144         if (r < 0)
 145                 return r;
 146
 147         r = sd_bus_message_append(m, "uos", j->id, p, j->unit->id);
 148         if (r < 0)
 149                 return r;
 150
 151         return sd_bus_send_to(bus, m, destination, NULL);
 152 }
 153
 154 static int send_changed_signal(sd_bus *bus, const char *destination, Job *j) {
 155         _cleanup_free_ char *p = NULL;
 156
 157         assert(bus);
 158         assert(j);
 159
 160         p = job_dbus_path(j);
 161         if (!p)
 162                 return -ENOMEM;
 163
 164         return sd_bus_emit_properties_changed(bus, p, "org.freedesktop.systemd1.Job", "State", NULL);
 165 }
 166
 167 void bus_job_send_change_signal(Job *j) {
 168         int r;
 169
 170         assert(j);
 171
 172         if (j->in_dbus_queue) {
 173                 LIST_REMOVE(dbus_queue, j->manager->dbus_job_queue, j);
 174                 j->in_dbus_queue = false;
 175         }
 176
 177         r = foreach_client(j, j->sent_dbus_new_signal ? send_changed_signal : send_new_signal);
 178         if (r < 0)
 179                 log_debug("Failed to send job change signal for %u: %s", j->id, strerror(-r));
 180
 181         j->sent_dbus_new_signal = true;
 182 }
 183
 184 static int send_removed_signal(sd_bus *bus, const char *destination, Job *j) {
 185         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 186         _cleanup_free_ char *p = NULL;
 187         int r;
 188
 189         assert(bus);
 190         assert(j);
 191
 192         p = job_dbus_path(j);
 193         if (!p)
 194                 return -ENOMEM;
 195
 196
 197         r = sd_bus_message_new_signal(
 198                         bus,
 199                         &m,
 200                         "/org/freedesktop/systemd1",
 201                         "org.freedesktop.systemd1.Manager",
 202                         "JobRemoved");
 203         if (r < 0)
 204                 return r;
 205
 206         r = sd_bus_message_append(m, "uoss", j->id, p, j->unit->id, job_result_to_string(j->result));
 207         if (r < 0)
 208                 return r;
 209
 210         return sd_bus_send_to(bus, m, destination, NULL);
 211 }
 212
 213 void bus_job_send_removed_signal(Job *j) {
 214         int r;
 215
 216         assert(j);
 217
 218         if (!j->sent_dbus_new_signal)
 219                 bus_job_send_change_signal(j);
 220
 221         r = foreach_client(j, send_removed_signal);
 222         if (r < 0)
 223                 log_debug("Failed to send job remove signal for %u: %s", j->id, strerror(-r));
 224 }