dbus-manager.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   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-manager.h"
  27
  28 #define INTROSPECTION_BEGIN                                             \
  29         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  30         "<node>"                                                        \
  31         " <interface name=\"org.freedesktop.systemd1.Manager\">"        \
  32         "  <method name=\"GetUnit\">"                                   \
  33         "   <arg name=\"name\" type=\"s\" direction=\"in\"/>"           \
  34         "   <arg name=\"unit\" type=\"o\" direction=\"out\"/>"          \
  35         "  </method>"                                                   \
  36         "  <method name=\"LoadUnit\">"                                  \
  37         "   <arg name=\"name\" type=\"s\" direction=\"in\"/>"           \
  38         "   <arg name=\"unit\" type=\"o\" direction=\"out\"/>"          \
  39         "  </method>"                                                   \
  40         "  <method name=\"GetJob\">"                                    \
  41         "   <arg name=\"id\" type=\"u\" direction=\"in\"/>"             \
  42         "   <arg name=\"job\" type=\"o\" direction=\"out\"/>"           \
  43         "  </method>"                                                   \
  44         "  <method name=\"ClearJobs\"/>"                                \
  45         "  <method name=\"ListUnits\">"                                 \
  46         "   <arg name=\"units\" type=\"a(sssssouso)\" direction=\"out\"/>" \
  47         "  </method>"                                                   \
  48         "  <method name=\"ListJobs\">"                                  \
  49         "   <arg name=\"jobs\" type=\"a(usssoo)\" direction=\"out\"/>"  \
  50         "  </method>"                                                   \
  51         "  <method name=\"Subscribe\"/>"                                \
  52         "  <method name=\"Unsubscribe\"/>"                              \
  53         "  <method name=\"Dump\"/>"                                     \
  54         "  <method name=\"CreateSnapshot\">"                            \
  55         "   <arg name=\"name\" type=\"s\" direction=\"in\"/>"           \
  56         "   <arg nane=\"cleanup\" type=\"b\" direction=\"in\"/>"        \
  57         "   <arg name=\"unit\" type=\"o\" direction=\"out\"/>"          \
  58         "  </method>"                                                   \
  59         "  <method name=\"Reload\"/>"                                   \
  60         "  <method name=\"Reexecute\"/>"                                \
  61         "  <method name=\"Exit\"/>"                                     \
  62         "  <signal name=\"UnitNew\">"                                   \
  63         "   <arg name=\"id\" type=\"s\"/>"                              \
  64         "   <arg name=\"unit\" type=\"o\"/>"                            \
  65         "  </signal>"                                                   \
  66         "  <signal name=\"UnitRemoved\">"                               \
  67         "   <arg name=\"id\" type=\"s\"/>"                              \
  68         "   <arg name=\"unit\" type=\"o\"/>"                            \
  69         "  </signal>"                                                   \
  70         "  <signal name=\"JobNew\">"                                    \
  71         "   <arg name=\"id\" type=\"u\"/>"                              \
  72         "   <arg name=\"job\" type=\"o\"/>"                             \
  73         "  </signal>"                                                   \
  74         "  <signal name=\"JobRemoved\">"                                \
  75         "   <arg name=\"id\" type=\"u\"/>"                              \
  76         "   <arg name=\"job\" type=\"o\"/>"                             \
  77         "  </signal>"                                                   \
  78         "  <property name=\"Version\" type=\"s\" access=\"read\"/>"     \
  79         "  <property name=\"RunningAs\" type=\"s\" access=\"read\"/>"   \
  80         "  <property name=\"BootTimestamp\" type=\"t\" access=\"read\"/>" \
  81         "  <property name=\"LogLevel\" type=\"s\" access=\"read\"/>"    \
  82         "  <property name=\"LogTarget\" type=\"s\" access=\"read\"/>"   \
  83         "  <property name=\"NNames\" type=\"u\" access=\"read\"/>"      \
  84         "  <property name=\"NJobs\" type=\"u\" access=\"read\"/>"       \
  85         " </interface>"                                                 \
  86         BUS_PROPERTIES_INTERFACE                                        \
  87         BUS_INTROSPECTABLE_INTERFACE
  88
  89 #define INTROSPECTION_END                                               \
  90         "</node>"
  91
  92 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_manager_append_running_as, manager_running_as, ManagerRunningAs);
  93
  94 static int bus_manager_append_log_target(Manager *m, DBusMessageIter *i, const char *property, void *data) {
  95         const char *t;
  96
  97         assert(m);
  98         assert(i);
  99         assert(property);
 100
 101         t = log_target_to_string(log_get_target());
 102
 103         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
 104                 return -ENOMEM;
 105
 106         return 0;
 107 }
 108
 109 static int bus_manager_append_log_level(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 110         const char *t;
 111
 112         assert(m);
 113         assert(i);
 114         assert(property);
 115
 116         t = log_level_to_string(log_get_max_level());
 117
 118         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
 119                 return -ENOMEM;
 120
 121         return 0;
 122 }
 123
 124 static int bus_manager_append_n_names(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 125         uint32_t u;
 126
 127         assert(m);
 128         assert(i);
 129         assert(property);
 130
 131         u = hashmap_size(m->units);
 132
 133         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, &u))
 134                 return -ENOMEM;
 135
 136         return 0;
 137 }
 138
 139 static int bus_manager_append_n_jobs(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 140         uint32_t u;
 141
 142         assert(m);
 143         assert(i);
 144         assert(property);
 145
 146         u = hashmap_size(m->jobs);
 147
 148         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, &u))
 149                 return -ENOMEM;
 150
 151         return 0;
 152 }
 153
 154 static DBusHandlerResult bus_manager_message_handler(DBusConnection  *connection, DBusMessage *message, void *data) {
 155         Manager *m = data;
 156
 157         const BusProperty properties[] = {
 158                 { "org.freedesktop.systemd1.Manager", "Version",       bus_property_append_string,    "s", PACKAGE_STRING     },
 159                 { "org.freedesktop.systemd1.Manager", "RunningAs",     bus_manager_append_running_as, "s", &m->running_as     },
 160                 { "org.freedesktop.systemd1.Manager", "BootTimestamp", bus_property_append_uint64,    "t", &m->boot_timestamp },
 161                 { "org.freedesktop.systemd1.Manager", "LogLevel",      bus_manager_append_log_level,  "s", NULL               },
 162                 { "org.freedesktop.systemd1.Manager", "LogTarget",     bus_manager_append_log_target, "s", NULL               },
 163                 { "org.freedesktop.systemd1.Manager", "NNames",        bus_manager_append_n_names,    "u", NULL               },
 164                 { "org.freedesktop.systemd1.Manager", "NJobs",         bus_manager_append_n_jobs,     "u", NULL               },
 165                 { NULL, NULL, NULL, NULL, NULL }
 166         };
 167
 168         int r;
 169         DBusError error;
 170         DBusMessage *reply = NULL;
 171         char * path = NULL;
 172
 173         assert(connection);
 174         assert(message);
 175         assert(m);
 176
 177         dbus_error_init(&error);
 178
 179         log_debug("Got D-Bus request: %s.%s() on %s",
 180                   dbus_message_get_interface(message),
 181                   dbus_message_get_member(message),
 182                   dbus_message_get_path(message));
 183
 184         if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "GetUnit")) {
 185                 const char *name;
 186                 Unit *u;
 187
 188                 if (!dbus_message_get_args(
 189                                     message,
 190                                     &error,
 191                                     DBUS_TYPE_STRING, &name,
 192                                     DBUS_TYPE_INVALID))
 193                         return bus_send_error_reply(m, message, &error, -EINVAL);
 194
 195                 if (!(u = manager_get_unit(m, name)))
 196                         return bus_send_error_reply(m, message, NULL, -ENOENT);
 197
 198                 if (!(reply = dbus_message_new_method_return(message)))
 199                         goto oom;
 200
 201                 if (!(path = unit_dbus_path(u)))
 202                         goto oom;
 203
 204                 if (!dbus_message_append_args(
 205                                     reply,
 206                                     DBUS_TYPE_OBJECT_PATH, &path,
 207                                     DBUS_TYPE_INVALID))
 208                         goto oom;
 209
 210         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "LoadUnit")) {
 211                 const char *name;
 212                 Unit *u;
 213
 214                 if (!dbus_message_get_args(
 215                                     message,
 216                                     &error,
 217                                     DBUS_TYPE_STRING, &name,
 218                                     DBUS_TYPE_INVALID))
 219                         return bus_send_error_reply(m, message, &error, -EINVAL);
 220
 221                 if ((r = manager_load_unit(m, name, NULL, &u)) < 0)
 222                         return bus_send_error_reply(m, message, NULL, r);
 223
 224                 if (!(reply = dbus_message_new_method_return(message)))
 225                         goto oom;
 226
 227                 if (!(path = unit_dbus_path(u)))
 228                         goto oom;
 229
 230                 if (!dbus_message_append_args(
 231                                     reply,
 232                                     DBUS_TYPE_OBJECT_PATH, &path,
 233                                     DBUS_TYPE_INVALID))
 234                         goto oom;
 235
 236         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "GetJob")) {
 237                 uint32_t id;
 238                 Job *j;
 239
 240                 if (!dbus_message_get_args(
 241                                     message,
 242                                     &error,
 243                                     DBUS_TYPE_UINT32, &id,
 244                                     DBUS_TYPE_INVALID))
 245                         return bus_send_error_reply(m, message, &error, -EINVAL);
 246
 247                 if (!(j = manager_get_job(m, id)))
 248                         return bus_send_error_reply(m, message, NULL, -ENOENT);
 249
 250                 if (!(reply = dbus_message_new_method_return(message)))
 251                         goto oom;
 252
 253                 if (!(path = job_dbus_path(j)))
 254                         goto oom;
 255
 256                 if (!dbus_message_append_args(
 257                                     reply,
 258                                     DBUS_TYPE_OBJECT_PATH, &path,
 259                                     DBUS_TYPE_INVALID))
 260                         goto oom;
 261
 262         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "ClearJobs")) {
 263
 264                 manager_clear_jobs(m);
 265
 266                 if (!(reply = dbus_message_new_method_return(message)))
 267                         goto oom;
 268
 269         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "ListUnits")) {
 270                 DBusMessageIter iter, sub;
 271                 Iterator i;
 272                 Unit *u;
 273                 const char *k;
 274
 275                 if (!(reply = dbus_message_new_method_return(message)))
 276                         goto oom;
 277
 278                 dbus_message_iter_init_append(reply, &iter);
 279
 280                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(sssssouso)", &sub))
 281                         goto oom;
 282
 283                 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
 284                         char *u_path, *j_path;
 285                         const char *description, *load_state, *active_state, *sub_state, *job_type;
 286                         DBusMessageIter sub2;
 287                         uint32_t job_id;
 288
 289                         if (k != u->meta.id)
 290                                 continue;
 291
 292                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 293                                 goto oom;
 294
 295                         description = unit_description(u);
 296                         load_state = unit_load_state_to_string(u->meta.load_state);
 297                         active_state = unit_active_state_to_string(unit_active_state(u));
 298                         sub_state = unit_sub_state_to_string(u);
 299
 300                         if (!(u_path = unit_dbus_path(u)))
 301                                 goto oom;
 302
 303                         if (u->meta.job) {
 304                                 job_id = (uint32_t) u->meta.job->id;
 305
 306                                 if (!(j_path = job_dbus_path(u->meta.job))) {
 307                                         free(u_path);
 308                                         goto oom;
 309                                 }
 310
 311                                 job_type = job_type_to_string(u->meta.job->type);
 312                         } else {
 313                                 job_id = 0;
 314                                 j_path = u_path;
 315                                 job_type = "";
 316                         }
 317
 318                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &u->meta.id) ||
 319                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &description) ||
 320                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &load_state) ||
 321                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &active_state) ||
 322                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &sub_state) ||
 323                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &u_path) ||
 324                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &job_id) ||
 325                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &job_type) ||
 326                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &j_path)) {
 327                                 free(u_path);
 328                                 if (u->meta.job)
 329                                         free(j_path);
 330                                 goto oom;
 331                         }
 332
 333                         free(u_path);
 334                         if (u->meta.job)
 335                                 free(j_path);
 336
 337                         if (!dbus_message_iter_close_container(&sub, &sub2))
 338                                 goto oom;
 339                 }
 340
 341                 if (!dbus_message_iter_close_container(&iter, &sub))
 342                         goto oom;
 343
 344         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "ListJobs")) {
 345                 DBusMessageIter iter, sub;
 346                 Iterator i;
 347                 Job *j;
 348
 349                 if (!(reply = dbus_message_new_method_return(message)))
 350                         goto oom;
 351
 352                 dbus_message_iter_init_append(reply, &iter);
 353
 354                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(usssoo)", &sub))
 355                         goto oom;
 356
 357                 HASHMAP_FOREACH(j, m->jobs, i) {
 358                         char *u_path, *j_path;
 359                         const char *state, *type;
 360                         uint32_t id;
 361                         DBusMessageIter sub2;
 362
 363                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 364                                 goto oom;
 365
 366                         id = (uint32_t) j->id;
 367                         state = job_state_to_string(j->state);
 368                         type = job_type_to_string(j->type);
 369
 370                         if (!(j_path = job_dbus_path(j)))
 371                                 goto oom;
 372
 373                         if (!(u_path = unit_dbus_path(j->unit))) {
 374                                 free(j_path);
 375                                 goto oom;
 376                         }
 377
 378                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &id) ||
 379                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &j->unit->meta.id) ||
 380                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &type) ||
 381                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &state) ||
 382                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &j_path) ||
 383                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &u_path)) {
 384                                 free(j_path);
 385                                 free(u_path);
 386                                 goto oom;
 387                         }
 388
 389                         free(j_path);
 390                         free(u_path);
 391
 392                         if (!dbus_message_iter_close_container(&sub, &sub2))
 393                                 goto oom;
 394                 }
 395
 396                 if (!dbus_message_iter_close_container(&iter, &sub))
 397                         goto oom;
 398
 399         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "Subscribe")) {
 400                 char *client;
 401
 402                 if (!(client = strdup(dbus_message_get_sender(message))))
 403                         goto oom;
 404
 405                 r = set_put(m->subscribed, client);
 406
 407                 if (r < 0)
 408                         return bus_send_error_reply(m, message, NULL, r);
 409
 410                 if (!(reply = dbus_message_new_method_return(message)))
 411                         goto oom;
 412
 413         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "Unsubscribe")) {
 414                 char *client;
 415
 416                 if (!(client = set_remove(m->subscribed, (char*) dbus_message_get_sender(message))))
 417                         return bus_send_error_reply(m, message, NULL, -ENOENT);
 418
 419                 free(client);
 420
 421                 if (!(reply = dbus_message_new_method_return(message)))
 422                         goto oom;
 423
 424         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "Dump")) {
 425                 FILE *f;
 426                 char *dump = NULL;
 427                 size_t size;
 428
 429                 if (!(reply = dbus_message_new_method_return(message)))
 430                         goto oom;
 431
 432                 if (!(f = open_memstream(&dump, &size)))
 433                         goto oom;
 434
 435                 manager_dump_units(m, f, NULL);
 436                 manager_dump_jobs(m, f, NULL);
 437
 438                 if (ferror(f)) {
 439                         fclose(f);
 440                         free(dump);
 441                         goto oom;
 442                 }
 443
 444                 fclose(f);
 445
 446                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &dump, DBUS_TYPE_INVALID)) {
 447                         free(dump);
 448                         goto oom;
 449                 }
 450
 451                 free(dump);
 452         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "CreateSnapshot")) {
 453                 const char *name;
 454                 dbus_bool_t cleanup;
 455                 Snapshot *s;
 456
 457                 if (!dbus_message_get_args(
 458                                     message,
 459                                     &error,
 460                                     DBUS_TYPE_STRING, &name,
 461                                     DBUS_TYPE_BOOLEAN, &cleanup,
 462                                     DBUS_TYPE_INVALID))
 463                         return bus_send_error_reply(m, message, &error, -EINVAL);
 464
 465                 if (name && name[0] == 0)
 466                         name = NULL;
 467
 468                 if ((r = snapshot_create(m, name, cleanup, &s)) < 0)
 469                         return bus_send_error_reply(m, message, NULL, r);
 470
 471                 if (!(reply = dbus_message_new_method_return(message)))
 472                         goto oom;
 473
 474                 if (!(path = unit_dbus_path(UNIT(s))))
 475                         goto oom;
 476
 477                 if (!dbus_message_append_args(
 478                                     reply,
 479                                     DBUS_TYPE_OBJECT_PATH, &path,
 480                                     DBUS_TYPE_INVALID))
 481                         goto oom;
 482
 483         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
 484                 char *introspection = NULL;
 485                 FILE *f;
 486                 Iterator i;
 487                 Unit *u;
 488                 Job *j;
 489                 const char *k;
 490                 size_t size;
 491
 492                 if (!(reply = dbus_message_new_method_return(message)))
 493                         goto oom;
 494
 495                 /* We roll our own introspection code here, instead of
 496                  * relying on bus_default_message_handler() because we
 497                  * need to generate our introspection string
 498                  * dynamically. */
 499
 500                 if (!(f = open_memstream(&introspection, &size)))
 501                         goto oom;
 502
 503                 fputs(INTROSPECTION_BEGIN, f);
 504
 505                 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
 506                         char *p;
 507
 508                         if (k != u->meta.id)
 509                                 continue;
 510
 511                         if (!(p = bus_path_escape(k))) {
 512                                 fclose(f);
 513                                 free(introspection);
 514                                 goto oom;
 515                         }
 516
 517                         fprintf(f, "<node name=\"unit/%s\"/>", p);
 518                         free(p);
 519                 }
 520
 521                 HASHMAP_FOREACH(j, m->jobs, i)
 522                         fprintf(f, "<node name=\"job/%lu\"/>", (unsigned long) j->id);
 523
 524                 fputs(INTROSPECTION_END, f);
 525
 526                 if (ferror(f)) {
 527                         fclose(f);
 528                         free(introspection);
 529                         goto oom;
 530                 }
 531
 532                 fclose(f);
 533
 534                 if (!introspection)
 535                         goto oom;
 536
 537                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
 538                         free(introspection);
 539                         goto oom;
 540                 }
 541
 542                 free(introspection);
 543
 544         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "Reload")) {
 545
 546                 assert(!m->queued_message);
 547
 548                 /* Instead of sending the reply back right away, we
 549                  * just remember that we need to and then send it
 550                  * after the reload is finished. That way the caller
 551                  * knows when the reload finished. */
 552
 553                 if (!(m->queued_message = dbus_message_new_method_return(message)))
 554                         goto oom;
 555
 556                 m->exit_code = MANAGER_RELOAD;
 557
 558         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "Reexecute")) {
 559
 560                 if (!(reply = dbus_message_new_method_return(message)))
 561                         goto oom;
 562
 563                 m->exit_code = MANAGER_REEXECUTE;
 564
 565         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Manager", "Exit")) {
 566
 567                 if (m->running_as == MANAGER_INIT)
 568                         return bus_send_error_reply(m, message, NULL, -ENOTSUP);
 569
 570                 if (!(reply = dbus_message_new_method_return(message)))
 571                         goto oom;
 572
 573                 m->exit_code = MANAGER_EXIT;
 574
 575         } else
 576                 return bus_default_message_handler(m, message, NULL, properties);
 577
 578         free(path);
 579
 580         if (reply) {
 581                 if (!dbus_connection_send(connection, reply, NULL))
 582                         goto oom;
 583
 584                 dbus_message_unref(reply);
 585         }
 586
 587         return DBUS_HANDLER_RESULT_HANDLED;
 588
 589 oom:
 590         free(path);
 591
 592         if (reply)
 593                 dbus_message_unref(reply);
 594
 595         dbus_error_free(&error);
 596
 597         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 598 }
 599
 600 const DBusObjectPathVTable bus_manager_vtable = {
 601         .message_function = bus_manager_message_handler
 602 };