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.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 int bus_job_method_cancel(sd_bus_message *message, void *userdata, sd_bus_error *error) {
  56         Job *j = userdata;
  57         int r;
  58
  59         assert(message);
  60         assert(j);
  61
  62         r = mac_selinux_unit_access_check(j->unit, message, "stop", error);
  63         if (r < 0)
  64                 return r;
  65
  66         /* Access is granted to the job owner */
  67         if (!sd_bus_track_contains(j->clients, sd_bus_message_get_sender(message))) {
  68
  69                 /* And for everybody else consult PolicyKit */
  70                 r = bus_verify_manage_units_async(j->unit->manager, message, error);
  71                 if (r < 0)
  72                         return r;
  73                 if (r == 0)
  74                         return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
  75         }
  76
  77         job_finish_and_invalidate(j, JOB_CANCELED, true);
  78
  79         return sd_bus_reply_method_return(message, NULL);
  80 }
  81
  82 const sd_bus_vtable bus_job_vtable[] = {
  83         SD_BUS_VTABLE_START(0),
  84         SD_BUS_METHOD("Cancel", NULL, NULL, bus_job_method_cancel, SD_BUS_VTABLE_UNPRIVILEGED),
  85         SD_BUS_PROPERTY("Id", "u", NULL, offsetof(Job, id), SD_BUS_VTABLE_PROPERTY_CONST),
  86         SD_BUS_PROPERTY("Unit", "(so)", property_get_unit, 0, SD_BUS_VTABLE_PROPERTY_CONST),
  87         SD_BUS_PROPERTY("JobType", "s", property_get_type, offsetof(Job, type), SD_BUS_VTABLE_PROPERTY_CONST),
  88         SD_BUS_PROPERTY("State", "s", property_get_state, offsetof(Job, state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  89         SD_BUS_VTABLE_END
  90 };
  91
  92 static int send_new_signal(sd_bus *bus, void *userdata) {
  93         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
  94         _cleanup_free_ char *p = NULL;
  95         Job *j = userdata;
  96         int r;
  97
  98         assert(bus);
  99         assert(j);
 100
 101         p = job_dbus_path(j);
 102         if (!p)
 103                 return -ENOMEM;
 104
 105         r = sd_bus_message_new_signal(
 106                         bus,
 107                         &m,
 108                         "/org/freedesktop/systemd1",
 109                         "org.freedesktop.systemd1.Manager",
 110                         "JobNew");
 111         if (r < 0)
 112                 return r;
 113
 114         r = sd_bus_message_append(m, "uos", j->id, p, j->unit->id);
 115         if (r < 0)
 116                 return r;
 117
 118         return sd_bus_send(bus, m, NULL);
 119 }
 120
 121 static int send_changed_signal(sd_bus *bus, void *userdata) {
 122         _cleanup_free_ char *p = NULL;
 123         Job *j = userdata;
 124
 125         assert(bus);
 126         assert(j);
 127
 128         p = job_dbus_path(j);
 129         if (!p)
 130                 return -ENOMEM;
 131
 132         return sd_bus_emit_properties_changed(bus, p, "org.freedesktop.systemd1.Job", "State", NULL);
 133 }
 134
 135 void bus_job_send_change_signal(Job *j) {
 136         int r;
 137
 138         assert(j);
 139
 140         if (j->in_dbus_queue) {
 141                 LIST_REMOVE(dbus_queue, j->manager->dbus_job_queue, j);
 142                 j->in_dbus_queue = false;
 143         }
 144
 145         r = bus_foreach_bus(j->manager, j->clients, j->sent_dbus_new_signal ? send_changed_signal : send_new_signal, j);
 146         if (r < 0)
 147                 log_debug_errno(r, "Failed to send job change signal for %u: %m", j->id);
 148
 149         j->sent_dbus_new_signal = true;
 150 }
 151
 152 static int send_removed_signal(sd_bus *bus, void *userdata) {
 153         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 154         _cleanup_free_ char *p = NULL;
 155         Job *j = userdata;
 156         int r;
 157
 158         assert(bus);
 159         assert(j);
 160
 161         p = job_dbus_path(j);
 162         if (!p)
 163                 return -ENOMEM;
 164
 165         r = sd_bus_message_new_signal(
 166                         bus,
 167                         &m,
 168                         "/org/freedesktop/systemd1",
 169                         "org.freedesktop.systemd1.Manager",
 170                         "JobRemoved");
 171         if (r < 0)
 172                 return r;
 173
 174         r = sd_bus_message_append(m, "uoss", j->id, p, j->unit->id, job_result_to_string(j->result));
 175         if (r < 0)
 176                 return r;
 177
 178         return sd_bus_send(bus, m, NULL);
 179 }
 180
 181 void bus_job_send_removed_signal(Job *j) {
 182         int r;
 183
 184         assert(j);
 185
 186         if (!j->sent_dbus_new_signal)
 187                 bus_job_send_change_signal(j);
 188
 189         r = bus_foreach_bus(j->manager, j->clients, send_removed_signal, j);
 190         if (r < 0)
 191                 log_debug_errno(r, "Failed to send job remove signal for %u: %m", j->id);
 192 }