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 *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 = mac_selinux_unit_access_check(j->unit, message, "stop", error);
  64         if (r < 0)
  65                 return r;
  66
  67         /* Access is granted to the job owner */
  68         if (!sd_bus_track_contains(j->clients, sd_bus_message_get_sender(message))) {
  69
  70                 /* And for everybody else consult PolicyKit */
  71                 r = bus_verify_manage_units_async(j->unit->manager, message, error);
  72                 if (r < 0)
  73                         return r;
  74                 if (r == 0)
  75                         return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
  76         }
  77
  78         job_finish_and_invalidate(j, JOB_CANCELED, true);
  79
  80         return sd_bus_reply_method_return(message, NULL);
  81 }
  82
  83 const sd_bus_vtable bus_job_vtable[] = {
  84         SD_BUS_VTABLE_START(0),
  85         SD_BUS_METHOD("Cancel", NULL, NULL, bus_job_method_cancel, SD_BUS_VTABLE_UNPRIVILEGED),
  86         SD_BUS_PROPERTY("Id", "u", NULL, offsetof(Job, id), SD_BUS_VTABLE_PROPERTY_CONST),
  87         SD_BUS_PROPERTY("Unit", "(so)", property_get_unit, 0, SD_BUS_VTABLE_PROPERTY_CONST),
  88         SD_BUS_PROPERTY("JobType", "s", property_get_type, offsetof(Job, type), SD_BUS_VTABLE_PROPERTY_CONST),
  89         SD_BUS_PROPERTY("State", "s", property_get_state, offsetof(Job, state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  90         SD_BUS_VTABLE_END
  91 };
  92
  93 static int send_new_signal(sd_bus *bus, void *userdata) {
  94         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
  95         _cleanup_free_ char *p = NULL;
  96         Job *j = userdata;
  97         int r;
  98
  99         assert(bus);
 100         assert(j);
 101
 102         p = job_dbus_path(j);
 103         if (!p)
 104                 return -ENOMEM;
 105
 106         r = sd_bus_message_new_signal(
 107                         bus,
 108                         &m,
 109                         "/org/freedesktop/systemd1",
 110                         "org.freedesktop.systemd1.Manager",
 111                         "JobNew");
 112         if (r < 0)
 113                 return r;
 114
 115         r = sd_bus_message_append(m, "uos", j->id, p, j->unit->id);
 116         if (r < 0)
 117                 return r;
 118
 119         return sd_bus_send(bus, m, NULL);
 120 }
 121
 122 static int send_changed_signal(sd_bus *bus, void *userdata) {
 123         _cleanup_free_ char *p = NULL;
 124         Job *j = userdata;
 125
 126         assert(bus);
 127         assert(j);
 128
 129         p = job_dbus_path(j);
 130         if (!p)
 131                 return -ENOMEM;
 132
 133         return sd_bus_emit_properties_changed(bus, p, "org.freedesktop.systemd1.Job", "State", NULL);
 134 }
 135
 136 void bus_job_send_change_signal(Job *j) {
 137         int r;
 138
 139         assert(j);
 140
 141         if (j->in_dbus_queue) {
 142                 LIST_REMOVE(dbus_queue, j->manager->dbus_job_queue, j);
 143                 j->in_dbus_queue = false;
 144         }
 145
 146         r = bus_foreach_bus(j->manager, j->clients, j->sent_dbus_new_signal ? send_changed_signal : send_new_signal, j);
 147         if (r < 0)
 148                 log_debug_errno(r, "Failed to send job change signal for %u: %m", j->id);
 149
 150         j->sent_dbus_new_signal = true;
 151 }
 152
 153 static int send_removed_signal(sd_bus *bus, void *userdata) {
 154         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 155         _cleanup_free_ char *p = NULL;
 156         Job *j = userdata;
 157         int r;
 158
 159         assert(bus);
 160         assert(j);
 161
 162         p = job_dbus_path(j);
 163         if (!p)
 164                 return -ENOMEM;
 165
 166         r = sd_bus_message_new_signal(
 167                         bus,
 168                         &m,
 169                         "/org/freedesktop/systemd1",
 170                         "org.freedesktop.systemd1.Manager",
 171                         "JobRemoved");
 172         if (r < 0)
 173                 return r;
 174
 175         r = sd_bus_message_append(m, "uoss", j->id, p, j->unit->id, job_result_to_string(j->result));
 176         if (r < 0)
 177                 return r;
 178
 179         return sd_bus_send(bus, m, NULL);
 180 }
 181
 182 void bus_job_send_removed_signal(Job *j) {
 183         int r;
 184
 185         assert(j);
 186
 187         if (!j->sent_dbus_new_signal)
 188                 bus_job_send_change_signal(j);
 189
 190         r = bus_foreach_bus(j->manager, j->clients, send_removed_signal, j);
 191         if (r < 0)
 192                 log_debug_errno(r, "Failed to send job remove signal for %u: %m", j->id);
 193 }