src/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 General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23
  24 #include "dbus.h"
  25 #include "log.h"
  26 #include "dbus-job.h"
  27 #include "dbus-common.h"
  28
  29 #define BUS_JOB_INTERFACE                                             \
  30         " <interface name=\"org.freedesktop.systemd1.Job\">\n"        \
  31         "  <method name=\"Cancel\"/>\n"                               \
  32         "  <property name=\"Id\" type=\"u\" access=\"read\"/>\n"      \
  33         "  <property name=\"Unit\" type=\"(so)\" access=\"read\"/>\n" \
  34         "  <property name=\"JobType\" type=\"s\" access=\"read\"/>\n" \
  35         "  <property name=\"State\" type=\"s\" access=\"read\"/>\n"   \
  36         " </interface>\n"
  37
  38 #define INTROSPECTION                                                 \
  39         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                     \
  40         "<node>\n"                                                    \
  41         BUS_JOB_INTERFACE                                             \
  42         BUS_PROPERTIES_INTERFACE                                      \
  43         BUS_PEER_INTERFACE                                            \
  44         BUS_INTROSPECTABLE_INTERFACE                                  \
  45         "</node>\n"
  46
  47 const char bus_job_interface[] _introspect_("Job") = BUS_JOB_INTERFACE;
  48
  49 #define INTERFACES_LIST                              \
  50         BUS_GENERIC_INTERFACES_LIST                  \
  51         "org.freedesktop.systemd1.Job\0"
  52
  53 #define INVALIDATING_PROPERTIES                 \
  54         "State\0"
  55
  56 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_job_append_state, job_state, JobState);
  57 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_job_append_type, job_type, JobType);
  58
  59 static int bus_job_append_unit(DBusMessageIter *i, const char *property, void *data) {
  60         Job *j = data;
  61         DBusMessageIter sub;
  62         char *p;
  63
  64         assert(i);
  65         assert(property);
  66         assert(j);
  67
  68         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
  69                 return -ENOMEM;
  70
  71         if (!(p = unit_dbus_path(j->unit)))
  72                 return -ENOMEM;
  73
  74         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &j->unit->id) ||
  75             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
  76                 free(p);
  77                 return -ENOMEM;
  78         }
  79
  80         free(p);
  81
  82         if (!dbus_message_iter_close_container(i, &sub))
  83                 return -ENOMEM;
  84
  85         return 0;
  86 }
  87
  88 static const BusProperty bus_job_properties[] = {
  89         { "Id",      bus_property_append_uint32, "u", offsetof(Job, id)    },
  90         { "State",   bus_job_append_state,       "s", offsetof(Job, state) },
  91         { "JobType", bus_job_append_type,        "s", offsetof(Job, type)  },
  92         { "Unit",    bus_job_append_unit,     "(so)", 0 },
  93         { NULL, }
  94 };
  95
  96 static DBusHandlerResult bus_job_message_dispatch(Job *j, DBusConnection *connection, DBusMessage *message) {
  97         DBusMessage *reply = NULL;
  98
  99         if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Job", "Cancel")) {
 100                 if (!(reply = dbus_message_new_method_return(message)))
 101                         goto oom;
 102
 103                 job_finish_and_invalidate(j, JOB_CANCELED);
 104
 105         } else {
 106                 const BusBoundProperties bps[] = {
 107                         { "org.freedesktop.systemd1.Job", bus_job_properties, j },
 108                         { NULL, }
 109                 };
 110                 return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, bps);
 111         }
 112
 113         if (reply) {
 114                 if (!dbus_connection_send(connection, reply, NULL))
 115                         goto oom;
 116
 117                 dbus_message_unref(reply);
 118         }
 119
 120         return DBUS_HANDLER_RESULT_HANDLED;
 121
 122 oom:
 123         if (reply)
 124                 dbus_message_unref(reply);
 125
 126         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 127 }
 128
 129 static DBusHandlerResult bus_job_message_handler(DBusConnection *connection, DBusMessage  *message, void *data) {
 130         Manager *m = data;
 131         Job *j;
 132         int r;
 133         DBusMessage *reply;
 134
 135         assert(connection);
 136         assert(message);
 137         assert(m);
 138
 139         if (streq(dbus_message_get_path(message), "/org/freedesktop/systemd1/job")) {
 140                 /* Be nice to gdbus and return introspection data for our mid-level paths */
 141
 142                 if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
 143                         char *introspection = NULL;
 144                         FILE *f;
 145                         Iterator i;
 146                         size_t size;
 147
 148                         if (!(reply = dbus_message_new_method_return(message)))
 149                                 goto oom;
 150
 151                         /* We roll our own introspection code here, instead of
 152                          * relying on bus_default_message_handler() because we
 153                          * need to generate our introspection string
 154                          * dynamically. */
 155
 156                         if (!(f = open_memstream(&introspection, &size)))
 157                                 goto oom;
 158
 159                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 160                               "<node>\n", f);
 161
 162                         fputs(BUS_INTROSPECTABLE_INTERFACE, f);
 163                         fputs(BUS_PEER_INTERFACE, f);
 164
 165                         HASHMAP_FOREACH(j, m->jobs, i)
 166                                 fprintf(f, "<node name=\"job/%lu\"/>", (unsigned long) j->id);
 167
 168                         fputs("</node>\n", f);
 169
 170                         if (ferror(f)) {
 171                                 fclose(f);
 172                                 free(introspection);
 173                                 goto oom;
 174                         }
 175
 176                         fclose(f);
 177
 178                         if (!introspection)
 179                                 goto oom;
 180
 181                         if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
 182                                 free(introspection);
 183                                 goto oom;
 184                         }
 185
 186                         free(introspection);
 187
 188                         if (!dbus_connection_send(connection, reply, NULL))
 189                                 goto oom;
 190
 191                         dbus_message_unref(reply);
 192
 193                         return DBUS_HANDLER_RESULT_HANDLED;
 194                 }
 195
 196                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 197         }
 198
 199         if ((r = manager_get_job_from_dbus_path(m, dbus_message_get_path(message), &j)) < 0) {
 200
 201                 if (r == -ENOMEM)
 202                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 203
 204                 if (r == -ENOENT) {
 205                         DBusError e;
 206
 207                         dbus_error_init(&e);
 208                         dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown job");
 209                         return bus_send_error_reply(connection, message, &e, r);
 210                 }
 211
 212                 return bus_send_error_reply(connection, message, NULL, r);
 213         }
 214
 215         return bus_job_message_dispatch(j, connection, message);
 216
 217 oom:
 218         if (reply)
 219                 dbus_message_unref(reply);
 220
 221         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 222 }
 223
 224 const DBusObjectPathVTable bus_job_vtable = {
 225         .message_function = bus_job_message_handler
 226 };
 227
 228 static int job_send_message(Job *j, DBusMessage *m) {
 229         int r;
 230
 231         assert(j);
 232         assert(m);
 233
 234         if (bus_has_subscriber(j->manager)) {
 235                 if ((r = bus_broadcast(j->manager, m)) < 0)
 236                         return r;
 237
 238         } else  if (j->bus_client) {
 239                 /* If nobody is subscribed, we just send the message
 240                  * to the client which created the job */
 241
 242                 assert(j->bus);
 243
 244                 if (!dbus_message_set_destination(m, j->bus_client))
 245                         return -ENOMEM;
 246
 247                 if (!dbus_connection_send(j->bus, m, NULL))
 248                         return -ENOMEM;
 249         }
 250
 251         return 0;
 252 }
 253
 254 void bus_job_send_change_signal(Job *j) {
 255         char *p = NULL;
 256         DBusMessage *m = NULL;
 257
 258         assert(j);
 259
 260         if (j->in_dbus_queue) {
 261                 LIST_REMOVE(Job, dbus_queue, j->manager->dbus_job_queue, j);
 262                 j->in_dbus_queue = false;
 263         }
 264
 265         if (!bus_has_subscriber(j->manager) && !j->bus_client) {
 266                 j->sent_dbus_new_signal = true;
 267                 return;
 268         }
 269
 270         if (!(p = job_dbus_path(j)))
 271                 goto oom;
 272
 273         if (j->sent_dbus_new_signal) {
 274                 /* Send a properties changed signal */
 275
 276                 if (!(m = bus_properties_changed_new(p, "org.freedesktop.systemd1.Job", INVALIDATING_PROPERTIES)))
 277                         goto oom;
 278
 279         } else {
 280                 /* Send a new signal */
 281
 282                 if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobNew")))
 283                         goto oom;
 284
 285                 if (!dbus_message_append_args(m,
 286                                               DBUS_TYPE_UINT32, &j->id,
 287                                               DBUS_TYPE_OBJECT_PATH, &p,
 288                                               DBUS_TYPE_INVALID))
 289                         goto oom;
 290         }
 291
 292         if (job_send_message(j, m) < 0)
 293                 goto oom;
 294
 295         free(p);
 296         dbus_message_unref(m);
 297
 298         j->sent_dbus_new_signal = true;
 299
 300         return;
 301
 302 oom:
 303         free(p);
 304
 305         if (m)
 306                 dbus_message_unref(m);
 307
 308         log_error("Failed to allocate job change signal.");
 309 }
 310
 311 void bus_job_send_removed_signal(Job *j) {
 312         char *p = NULL;
 313         DBusMessage *m = NULL;
 314         const char *r;
 315
 316         assert(j);
 317
 318         if (!bus_has_subscriber(j->manager) && !j->bus_client)
 319                 return;
 320
 321         if (!j->sent_dbus_new_signal)
 322                 bus_job_send_change_signal(j);
 323
 324         if (!(p = job_dbus_path(j)))
 325                 goto oom;
 326
 327         if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobRemoved")))
 328                 goto oom;
 329
 330         r = job_result_to_string(j->result);
 331
 332         if (!dbus_message_append_args(m,
 333                                       DBUS_TYPE_UINT32, &j->id,
 334                                       DBUS_TYPE_OBJECT_PATH, &p,
 335                                       DBUS_TYPE_STRING, &r,
 336                                       DBUS_TYPE_INVALID))
 337                 goto oom;
 338
 339         if (job_send_message(j, m) < 0)
 340                 goto oom;
 341
 342         free(p);
 343         dbus_message_unref(m);
 344
 345         return;
 346
 347 oom:
 348         free(p);
 349
 350         if (m)
 351                 dbus_message_unref(m);
 352
 353         log_error("Failed to allocate job remove signal.");
 354 }