src/machine/machined-dbus.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 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 <errno.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <pwd.h>
  26
  27 #include <systemd/sd-id128.h>
  28 #include <systemd/sd-messages.h>
  29
  30 #include "machined.h"
  31 #include "dbus-common.h"
  32 #include "strv.h"
  33 #include "mkdir.h"
  34 #include "path-util.h"
  35 #include "special.h"
  36 #include "sleep-config.h"
  37 #include "fileio-label.h"
  38 #include "label.h"
  39 #include "utf8.h"
  40 #include "unit-name.h"
  41 #include "bus-errors.h"
  42 #include "virt.h"
  43
  44 #define BUS_MANAGER_INTERFACE                                           \
  45         " <interface name=\"org.freedesktop.machine1.Manager\">\n"      \
  46         "  <method name=\"GetMachine\">\n"                              \
  47         "   <arg name=\"name\" type=\"s\" direction=\"in\"/>\n"         \
  48         "   <arg name=\"machine\" type=\"o\" direction=\"out\"/>\n"     \
  49         "  </method>\n"                                                 \
  50         "  <method name=\"GetMachineByPID\">\n"                         \
  51         "   <arg name=\"pid\" type=\"u\" direction=\"in\"/>\n"          \
  52         "   <arg name=\"machine\" type=\"o\" direction=\"out\"/>\n"     \
  53         "  </method>\n"                                                 \
  54         "  <method name=\"ListMachines\">\n"                            \
  55         "   <arg name=\"machines\" type=\"a(ssso)\" direction=\"out\"/>\n" \
  56         "  </method>\n"                                                 \
  57         "  <method name=\"CreateMachine\">\n"                           \
  58         "   <arg name=\"name\" type=\"s\" direction=\"in\"/>\n"         \
  59         "   <arg name=\"id\" type=\"ay\" direction=\"in\"/>\n"          \
  60         "   <arg name=\"service\" type=\"s\" direction=\"in\"/>\n"      \
  61         "   <arg name=\"class\" type=\"s\" direction=\"in\"/>\n"        \
  62         "   <arg name=\"leader\" type=\"u\" direction=\"in\"/>\n"       \
  63         "   <arg name=\"root_directory\" type=\"s\" direction=\"in\"/>\n" \
  64         "   <arg name=\"scope_properties\" type=\"a(sv)\" direction=\"in\"/>\n" \
  65         "   <arg name=\"path\" type=\"o\" direction=\"out\"/>\n"        \
  66         "  </method>\n"                                                 \
  67         "  <method name=\"KillMachine\">\n"                             \
  68         "   <arg name=\"name\" type=\"s\" direction=\"in\"/>\n"         \
  69         "   <arg name=\"who\" type=\"s\" direction=\"in\"/>\n"          \
  70         "   <arg name=\"signal\" type=\"s\" direction=\"in\"/>\n"       \
  71         "  </method>\n"                                                 \
  72         "  <method name=\"TerminateMachine\">\n"                        \
  73         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  74         "  </method>\n"                                                 \
  75         "  <signal name=\"MachineNew\">\n"                              \
  76         "   <arg name=\"machine\" type=\"s\"/>\n"                       \
  77         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  78         "  </signal>\n"                                                 \
  79         "  <signal name=\"MachineRemoved\">\n"                          \
  80         "   <arg name=\"machine\" type=\"s\"/>\n"                       \
  81         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  82         "  </signal>\n"                                                 \
  83         " </interface>\n"
  84
  85 #define INTROSPECTION_BEGIN                                             \
  86         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  87         "<node>\n"                                                      \
  88         BUS_MANAGER_INTERFACE                                           \
  89         BUS_PROPERTIES_INTERFACE                                        \
  90         BUS_PEER_INTERFACE                                              \
  91         BUS_INTROSPECTABLE_INTERFACE
  92
  93 #define INTROSPECTION_END                                               \
  94         "</node>\n"
  95
  96 #define INTERFACES_LIST                              \
  97         BUS_GENERIC_INTERFACES_LIST                  \
  98         "org.freedesktop.machine1.Manager\0"
  99
 100 static bool valid_machine_name(const char *p) {
 101         size_t l;
 102
 103         if (!filename_is_safe(p))
 104                 return false;
 105
 106         if (!ascii_is_valid(p))
 107                 return false;
 108
 109         l = strlen(p);
 110
 111         if (l < 1 || l> 64)
 112                 return false;
 113
 114         return true;
 115 }
 116
 117 static int bus_manager_create_machine(Manager *manager, DBusMessage *message) {
 118
 119         const char *name, *service, *class, *root_directory;
 120         _cleanup_free_ char *p = NULL;
 121         DBusMessageIter iter, sub;
 122         MachineClass c;
 123         uint32_t leader;
 124         sd_id128_t id;
 125         Machine *m;
 126         int n, r;
 127         void *v;
 128
 129         assert(manager);
 130         assert(message);
 131
 132         if (!dbus_message_iter_init(message, &iter) ||
 133             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 134                 return -EINVAL;
 135
 136         dbus_message_iter_get_basic(&iter, &name);
 137
 138         if (!valid_machine_name(name) ||
 139             !dbus_message_iter_next(&iter) ||
 140             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 141             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_BYTE)
 142                 return -EINVAL;
 143
 144         dbus_message_iter_recurse(&iter, &sub);
 145         dbus_message_iter_get_fixed_array(&sub, &v, &n);
 146
 147         if (n == 0)
 148                 id = SD_ID128_NULL;
 149         else if (n == 16)
 150                 memcpy(&id, v, n);
 151         else
 152                 return -EINVAL;
 153
 154         if (!dbus_message_iter_next(&iter) ||
 155             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 156                 return -EINVAL;
 157
 158         dbus_message_iter_get_basic(&iter, &service);
 159
 160         if (!dbus_message_iter_next(&iter) ||
 161             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 162                 return -EINVAL;
 163
 164         dbus_message_iter_get_basic(&iter, &class);
 165
 166         if (isempty(class))
 167                 c = _MACHINE_CLASS_INVALID;
 168         else {
 169                 c = machine_class_from_string(class);
 170                 if (c < 0)
 171                         return -EINVAL;
 172         }
 173
 174         if (!dbus_message_iter_next(&iter) ||
 175             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 176                 return -EINVAL;
 177
 178         dbus_message_iter_get_basic(&iter, &leader);
 179         if (!dbus_message_iter_next(&iter) ||
 180             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 181                 return -EINVAL;
 182
 183         dbus_message_iter_get_basic(&iter, &root_directory);
 184
 185         if (!(isempty(root_directory) || path_is_absolute(root_directory)))
 186                 return -EINVAL;
 187
 188         if (!dbus_message_iter_next(&iter) ||
 189             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 190             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRUCT)
 191                 return -EINVAL;
 192
 193         dbus_message_iter_recurse(&iter, &sub);
 194
 195         if (hashmap_get(manager->machines, name))
 196                 return -EEXIST;
 197
 198         if (leader <= 0) {
 199                 leader = bus_get_unix_process_id(manager->bus, dbus_message_get_sender(message), NULL);
 200                 if (leader == 0)
 201                         return -EINVAL;
 202         }
 203
 204         r = manager_add_machine(manager, name, &m);
 205         if (r < 0)
 206                 goto fail;
 207
 208         m->leader = leader;
 209         m->class = c;
 210         m->id = id;
 211
 212         if (!isempty(service)) {
 213                 m->service = strdup(service);
 214                 if (!m->service) {
 215                         r = -ENOMEM;
 216                         goto fail;
 217                 }
 218         }
 219
 220         if (!isempty(root_directory)) {
 221                 m->root_directory = strdup(root_directory);
 222                 if (!m->root_directory) {
 223                         r = -ENOMEM;
 224                         goto fail;
 225                 }
 226         }
 227
 228         r = machine_start(m, &sub);
 229         if (r < 0)
 230                 goto fail;
 231
 232         m->create_message = dbus_message_ref(message);
 233
 234         return 0;
 235
 236 fail:
 237         if (m)
 238                 machine_add_to_gc_queue(m);
 239
 240         return r;
 241 }
 242
 243 static DBusHandlerResult manager_message_handler(
 244                 DBusConnection *connection,
 245                 DBusMessage *message,
 246                 void *userdata) {
 247
 248         Manager *m = userdata;
 249
 250         DBusError error;
 251         _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
 252         int r;
 253
 254         assert(connection);
 255         assert(message);
 256         assert(m);
 257
 258         dbus_error_init(&error);
 259
 260         if (dbus_message_is_method_call(message, "org.freedesktop.machine1.Manager", "GetMachine")) {
 261                 Machine *machine;
 262                 const char *name;
 263                 char *p;
 264                 bool b;
 265
 266                 if (!dbus_message_get_args(
 267                                     message,
 268                                     &error,
 269                                     DBUS_TYPE_STRING, &name,
 270                                     DBUS_TYPE_INVALID))
 271                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 272
 273                 machine = hashmap_get(m->machines, name);
 274                 if (!machine)
 275                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 276
 277                 reply = dbus_message_new_method_return(message);
 278                 if (!reply)
 279                         goto oom;
 280
 281                 p = machine_bus_path(machine);
 282                 if (!p)
 283                         goto oom;
 284
 285                 b = dbus_message_append_args(
 286                                 reply,
 287                                 DBUS_TYPE_OBJECT_PATH, &p,
 288                                 DBUS_TYPE_INVALID);
 289                 free(p);
 290
 291                 if (!b)
 292                         goto oom;
 293
 294         } else if (dbus_message_is_method_call(message, "org.freedesktop.machine1.Manager", "GetMachineByPID")) {
 295                 uint32_t pid;
 296                 char *p;
 297                 Machine *machine;
 298                 bool b;
 299
 300                 if (!dbus_message_get_args(
 301                                     message,
 302                                     &error,
 303                                     DBUS_TYPE_UINT32, &pid,
 304                                     DBUS_TYPE_INVALID))
 305                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 306
 307                 r = manager_get_machine_by_pid(m, pid, &machine);
 308                 if (r <= 0)
 309                         return bus_send_error_reply(connection, message, NULL, r < 0 ? r : -ENOENT);
 310
 311                 reply = dbus_message_new_method_return(message);
 312                 if (!reply)
 313                         goto oom;
 314
 315                 p = machine_bus_path(machine);
 316                 if (!p)
 317                         goto oom;
 318
 319                 b = dbus_message_append_args(
 320                                 reply,
 321                                 DBUS_TYPE_OBJECT_PATH, &p,
 322                                 DBUS_TYPE_INVALID);
 323                 free(p);
 324
 325                 if (!b)
 326                         goto oom;
 327
 328         } else if (dbus_message_is_method_call(message, "org.freedesktop.machine1.Manager", "ListMachines")) {
 329                 Machine *machine;
 330                 Iterator i;
 331                 DBusMessageIter iter, sub;
 332
 333                 reply = dbus_message_new_method_return(message);
 334                 if (!reply)
 335                         goto oom;
 336
 337                 dbus_message_iter_init_append(reply, &iter);
 338
 339                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(ssso)", &sub))
 340                         goto oom;
 341
 342                 HASHMAP_FOREACH(machine, m->machines, i) {
 343                         _cleanup_free_ char *p = NULL;
 344                         DBusMessageIter sub2;
 345                         const char *class;
 346
 347                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 348                                 goto oom;
 349
 350                         p = machine_bus_path(machine);
 351                         if (!p)
 352                                 goto oom;
 353
 354                         class = strempty(machine_class_to_string(machine->class));
 355
 356                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &machine->name) ||
 357                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &class) ||
 358                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &machine->service) ||
 359                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 360                                 free(p);
 361                                 goto oom;
 362                         }
 363
 364                         if (!dbus_message_iter_close_container(&sub, &sub2))
 365                                 goto oom;
 366                 }
 367
 368                 if (!dbus_message_iter_close_container(&iter, &sub))
 369                         goto oom;
 370
 371         } else if (dbus_message_is_method_call(message, "org.freedesktop.machine1.Manager", "CreateMachine")) {
 372
 373                 r = bus_manager_create_machine(m, message);
 374                 if (r < 0)
 375                         return bus_send_error_reply(connection, message, NULL, r);
 376
 377         } else if (dbus_message_is_method_call(message, "org.freedesktop.machine1.Manager", "KillMachine")) {
 378                 const char *swho;
 379                 int32_t signo;
 380                 KillWho who;
 381                 const char *name;
 382                 Machine *machine;
 383
 384                 if (!dbus_message_get_args(
 385                                     message,
 386                                     &error,
 387                                     DBUS_TYPE_STRING, &name,
 388                                     DBUS_TYPE_STRING, &swho,
 389                                     DBUS_TYPE_INT32, &signo,
 390                                     DBUS_TYPE_INVALID))
 391                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 392
 393                 if (isempty(swho))
 394                         who = KILL_ALL;
 395                 else {
 396                         who = kill_who_from_string(swho);
 397                         if (who < 0)
 398                                 return bus_send_error_reply(connection, message, &error, -EINVAL);
 399                 }
 400
 401                 if (signo <= 0 || signo >= _NSIG)
 402                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 403
 404                 machine = hashmap_get(m->machines, name);
 405                 if (!machine)
 406                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 407
 408                 r = machine_kill(machine, who, signo);
 409                 if (r < 0)
 410                         return bus_send_error_reply(connection, message, NULL, r);
 411
 412                 reply = dbus_message_new_method_return(message);
 413                 if (!reply)
 414                         goto oom;
 415
 416         } else if (dbus_message_is_method_call(message, "org.freedesktop.machine1.Manager", "TerminateMachine")) {
 417                 const char *name;
 418                 Machine *machine;
 419
 420                 if (!dbus_message_get_args(
 421                                     message,
 422                                     &error,
 423                                     DBUS_TYPE_STRING, &name,
 424                                     DBUS_TYPE_INVALID))
 425                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 426
 427                 machine = hashmap_get(m->machines, name);
 428                 if (!machine)
 429                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 430
 431                 r = machine_stop(machine);
 432                 if (r < 0)
 433                         return bus_send_error_reply(connection, message, NULL, r);
 434
 435                 reply = dbus_message_new_method_return(message);
 436                 if (!reply)
 437                         goto oom;
 438
 439         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
 440                 char *introspection = NULL;
 441                 FILE *f;
 442                 Iterator i;
 443                 Machine *machine;
 444                 size_t size;
 445                 char *p;
 446
 447                 reply = dbus_message_new_method_return(message);
 448                 if (!reply)
 449                         goto oom;
 450
 451                 /* We roll our own introspection code here, instead of
 452                  * relying on bus_default_message_handler() because we
 453                  * need to generate our introspection string
 454                  * dynamically. */
 455
 456                 f = open_memstream(&introspection, &size);
 457                 if (!f)
 458                         goto oom;
 459
 460                 fputs(INTROSPECTION_BEGIN, f);
 461
 462                 HASHMAP_FOREACH(machine, m->machines, i) {
 463                         p = bus_path_escape(machine->name);
 464
 465                         if (p) {
 466                                 fprintf(f, "<node name=\"machine/%s\"/>", p);
 467                                 free(p);
 468                         }
 469                 }
 470
 471                 fputs(INTROSPECTION_END, f);
 472
 473                 if (ferror(f)) {
 474                         fclose(f);
 475                         free(introspection);
 476                         goto oom;
 477                 }
 478
 479                 fclose(f);
 480
 481                 if (!introspection)
 482                         goto oom;
 483
 484                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
 485                         free(introspection);
 486                         goto oom;
 487                 }
 488
 489                 free(introspection);
 490         } else
 491                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, NULL);
 492
 493         if (reply) {
 494                 if (!bus_maybe_send_reply(connection, message, reply))
 495                         goto oom;
 496         }
 497
 498         return DBUS_HANDLER_RESULT_HANDLED;
 499
 500 oom:
 501         dbus_error_free(&error);
 502
 503         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 504 }
 505
 506 const DBusObjectPathVTable bus_manager_vtable = {
 507         .message_function = manager_message_handler
 508 };
 509
 510 DBusHandlerResult bus_message_filter(
 511                 DBusConnection *connection,
 512                 DBusMessage *message,
 513                 void *userdata) {
 514
 515         Manager *m = userdata;
 516         DBusError error;
 517
 518         assert(m);
 519         assert(connection);
 520         assert(message);
 521
 522         dbus_error_init(&error);
 523
 524         log_debug("Got message: %s %s %s", strna(dbus_message_get_sender(message)), strna(dbus_message_get_interface(message)), strna(dbus_message_get_member(message)));
 525
 526         if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "JobRemoved")) {
 527                 const char *path, *result, *unit;
 528                 Machine *mm;
 529                 uint32_t id;
 530
 531                 if (!dbus_message_get_args(message, &error,
 532                                            DBUS_TYPE_UINT32, &id,
 533                                            DBUS_TYPE_OBJECT_PATH, &path,
 534                                            DBUS_TYPE_STRING, &unit,
 535                                            DBUS_TYPE_STRING, &result,
 536                                            DBUS_TYPE_INVALID)) {
 537                         log_error("Failed to parse JobRemoved message: %s", bus_error_message(&error));
 538                         goto finish;
 539                 }
 540
 541                 mm = hashmap_get(m->machine_units, unit);
 542                 if (mm) {
 543                         if (streq_ptr(path, mm->scope_job)) {
 544                                 free(mm->scope_job);
 545                                 mm->scope_job = NULL;
 546
 547                                 if (mm->started) {
 548                                         if (streq(result, "done"))
 549                                                 machine_send_create_reply(mm, NULL);
 550                                         else {
 551                                                 dbus_set_error(&error, BUS_ERROR_JOB_FAILED, "Start job for unit %s failed with '%s'", unit, result);
 552                                                 machine_send_create_reply(mm, &error);
 553                                         }
 554                                 } else
 555                                         machine_save(mm);
 556                         }
 557
 558                         machine_add_to_gc_queue(mm);
 559                 }
 560
 561         } else if (dbus_message_is_signal(message, "org.freedesktop.DBus.Properties", "PropertiesChanged")) {
 562
 563                 _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
 564                 _cleanup_free_ char *unit = NULL;
 565                 const char *path;
 566
 567                 path = dbus_message_get_path(message);
 568                 if (!path)
 569                         goto finish;
 570
 571                 unit_name_from_dbus_path(path, &unit);
 572                 if (unit) {
 573                         Machine *mm;
 574
 575                         mm = hashmap_get(m->machine_units, unit);
 576                         if (mm)
 577                                 machine_add_to_gc_queue(mm);
 578                 }
 579
 580         } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "UnitRemoved")) {
 581                 const char *path, *unit;
 582                 Machine *mm;
 583
 584                 if (!dbus_message_get_args(message, &error,
 585                                            DBUS_TYPE_STRING, &unit,
 586                                            DBUS_TYPE_OBJECT_PATH, &path,
 587                                            DBUS_TYPE_INVALID)) {
 588                         log_error("Failed to parse UnitRemoved message: %s", bus_error_message(&error));
 589                         goto finish;
 590                 }
 591
 592                 mm = hashmap_get(m->machine_units, unit);
 593                 if (mm)
 594                         machine_add_to_gc_queue(mm);
 595
 596         } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "Reloading")) {
 597                 dbus_bool_t b;
 598
 599                 if (!dbus_message_get_args(message, &error,
 600                                            DBUS_TYPE_BOOLEAN, &b,
 601                                            DBUS_TYPE_INVALID)) {
 602                         log_error("Failed to parse Reloading message: %s", bus_error_message(&error));
 603                         goto finish;
 604                 }
 605
 606                 /* systemd finished reloading, let's recheck all our machines */
 607                 if (!b) {
 608                         Machine *mm;
 609                         Iterator i;
 610
 611                         log_debug("System manager has been reloaded, rechecking machines...");
 612
 613                         HASHMAP_FOREACH(mm, m->machines, i)
 614                                 machine_add_to_gc_queue(mm);
 615                 }
 616         }
 617
 618 finish:
 619         dbus_error_free(&error);
 620
 621         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 622 }
 623
 624 static int copy_many_fields(DBusMessageIter *dest, DBusMessageIter *src);
 625
 626 static int copy_one_field(DBusMessageIter *dest, DBusMessageIter *src) {
 627         int type, r;
 628
 629         type = dbus_message_iter_get_arg_type(src);
 630
 631         switch (type) {
 632
 633         case DBUS_TYPE_STRUCT: {
 634                 DBusMessageIter dest_sub, src_sub;
 635
 636                 dbus_message_iter_recurse(src, &src_sub);
 637
 638                 if (!dbus_message_iter_open_container(dest, DBUS_TYPE_STRUCT, NULL, &dest_sub))
 639                         return log_oom();
 640
 641                 r = copy_many_fields(&dest_sub, &src_sub);
 642                 if (r < 0)
 643                         return r;
 644
 645                 if (!dbus_message_iter_close_container(dest, &dest_sub))
 646                         return log_oom();
 647
 648                 return 0;
 649         }
 650
 651         case DBUS_TYPE_ARRAY: {
 652                 DBusMessageIter dest_sub, src_sub;
 653
 654                 dbus_message_iter_recurse(src, &src_sub);
 655
 656                 if (!dbus_message_iter_open_container(dest, DBUS_TYPE_ARRAY, dbus_message_iter_get_signature(&src_sub), &dest_sub))
 657                         return log_oom();
 658
 659                 r = copy_many_fields(&dest_sub, &src_sub);
 660                 if (r < 0)
 661                         return r;
 662
 663                 if (!dbus_message_iter_close_container(dest, &dest_sub))
 664                         return log_oom();
 665
 666                 return 0;
 667         }
 668
 669         case DBUS_TYPE_VARIANT: {
 670                 DBusMessageIter dest_sub, src_sub;
 671
 672                 dbus_message_iter_recurse(src, &src_sub);
 673
 674                 if (!dbus_message_iter_open_container(dest, DBUS_TYPE_VARIANT, dbus_message_iter_get_signature(&src_sub), &dest_sub))
 675                         return log_oom();
 676
 677                 r = copy_one_field(&dest_sub, &src_sub);
 678                 if (r < 0)
 679                         return r;
 680
 681                 if (!dbus_message_iter_close_container(dest, &dest_sub))
 682                         return log_oom();
 683
 684                 return 0;
 685         }
 686
 687         case DBUS_TYPE_STRING:
 688         case DBUS_TYPE_OBJECT_PATH:
 689         case DBUS_TYPE_BYTE:
 690         case DBUS_TYPE_BOOLEAN:
 691         case DBUS_TYPE_UINT16:
 692         case DBUS_TYPE_INT16:
 693         case DBUS_TYPE_UINT32:
 694         case DBUS_TYPE_INT32:
 695         case DBUS_TYPE_UINT64:
 696         case DBUS_TYPE_INT64:
 697         case DBUS_TYPE_DOUBLE:
 698         case DBUS_TYPE_SIGNATURE: {
 699                 const void *p;
 700
 701                 dbus_message_iter_get_basic(src, &p);
 702                 dbus_message_iter_append_basic(dest, type, &p);
 703                 return 0;
 704         }
 705
 706         default:
 707                 return -EINVAL;
 708         }
 709 }
 710
 711 static int copy_many_fields(DBusMessageIter *dest, DBusMessageIter *src) {
 712         int r;
 713
 714         assert(dest);
 715         assert(src);
 716
 717         while (dbus_message_iter_get_arg_type(src) != DBUS_TYPE_INVALID) {
 718
 719                 r = copy_one_field(dest, src);
 720                 if (r < 0)
 721                         return r;
 722
 723                 dbus_message_iter_next(src);
 724         }
 725
 726         return 0;
 727 }
 728
 729 int manager_start_scope(
 730                 Manager *manager,
 731                 const char *scope,
 732                 pid_t pid,
 733                 const char *slice,
 734                 const char *description,
 735                 DBusMessageIter *more_properties,
 736                 DBusError *error,
 737                 char **job) {
 738
 739         _cleanup_dbus_message_unref_ DBusMessage *m = NULL, *reply = NULL;
 740         DBusMessageIter iter, sub, sub2, sub3, sub4;
 741         const char *timeout_stop_property = "TimeoutStopUSec";
 742         const char *pids_property = "PIDs";
 743         uint64_t timeout = 500 * USEC_PER_MSEC;
 744         const char *fail = "fail";
 745         uint32_t u;
 746         int r;
 747
 748         assert(manager);
 749         assert(scope);
 750         assert(pid > 1);
 751
 752         if (!slice)
 753                 slice = "";
 754
 755         m = dbus_message_new_method_call(
 756                         "org.freedesktop.systemd1",
 757                         "/org/freedesktop/systemd1",
 758                         "org.freedesktop.systemd1.Manager",
 759                         "StartTransientUnit");
 760         if (!m)
 761                 return log_oom();
 762
 763         dbus_message_iter_init_append(m, &iter);
 764
 765         if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &scope) ||
 766             !dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &fail) ||
 767             !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(sv)", &sub))
 768                 return log_oom();
 769
 770         if (!isempty(slice)) {
 771                 const char *slice_property = "Slice";
 772
 773                 if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2) ||
 774                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &slice_property) ||
 775                     !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, "s", &sub3) ||
 776                     !dbus_message_iter_append_basic(&sub3, DBUS_TYPE_STRING, &slice) ||
 777                     !dbus_message_iter_close_container(&sub2, &sub3) ||
 778                     !dbus_message_iter_close_container(&sub, &sub2))
 779                         return log_oom();
 780         }
 781
 782         if (!isempty(description)) {
 783                 const char *description_property = "Description";
 784
 785                 if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2) ||
 786                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &description_property) ||
 787                     !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, "s", &sub3) ||
 788                     !dbus_message_iter_append_basic(&sub3, DBUS_TYPE_STRING, &description) ||
 789                     !dbus_message_iter_close_container(&sub2, &sub3) ||
 790                     !dbus_message_iter_close_container(&sub, &sub2))
 791                         return log_oom();
 792         }
 793
 794         /* cgroup empty notification is not available in containers
 795          * currently. To make this less problematic, let's shorten the
 796          * stop timeout for sessions, so that we don't wait
 797          * forever. */
 798
 799         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2) ||
 800             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &timeout_stop_property) ||
 801             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, "t", &sub3) ||
 802             !dbus_message_iter_append_basic(&sub3, DBUS_TYPE_UINT64, &timeout) ||
 803             !dbus_message_iter_close_container(&sub2, &sub3) ||
 804             !dbus_message_iter_close_container(&sub, &sub2))
 805                 return log_oom();
 806
 807         u = pid;
 808         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2) ||
 809             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &pids_property) ||
 810             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, "au", &sub3) ||
 811             !dbus_message_iter_open_container(&sub3, DBUS_TYPE_ARRAY, "u", &sub4) ||
 812             !dbus_message_iter_append_basic(&sub4, DBUS_TYPE_UINT32, &u) ||
 813             !dbus_message_iter_close_container(&sub3, &sub4) ||
 814             !dbus_message_iter_close_container(&sub2, &sub3) ||
 815             !dbus_message_iter_close_container(&sub, &sub2))
 816                 return log_oom();
 817
 818         if (more_properties) {
 819                 r = copy_many_fields(&sub, more_properties);
 820                 if (r < 0)
 821                         return r;
 822         }
 823
 824         if (!dbus_message_iter_close_container(&iter, &sub))
 825                 return log_oom();
 826
 827         reply = dbus_connection_send_with_reply_and_block(manager->bus, m, -1, error);
 828         if (!reply)
 829                 return -EIO;
 830
 831         if (job) {
 832                 const char *j;
 833                 char *copy;
 834
 835                 if (!dbus_message_get_args(reply, error, DBUS_TYPE_OBJECT_PATH, &j, DBUS_TYPE_INVALID))
 836                         return -EIO;
 837
 838                 copy = strdup(j);
 839                 if (!copy)
 840                         return -ENOMEM;
 841
 842                 *job = copy;
 843         }
 844
 845         return 0;
 846 }
 847
 848 int manager_stop_unit(Manager *manager, const char *unit, DBusError *error, char **job) {
 849         _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
 850         const char *fail = "fail";
 851         int r;
 852
 853         assert(manager);
 854         assert(unit);
 855
 856         r = bus_method_call_with_reply(
 857                         manager->bus,
 858                         "org.freedesktop.systemd1",
 859                         "/org/freedesktop/systemd1",
 860                         "org.freedesktop.systemd1.Manager",
 861                         "StopUnit",
 862                         &reply,
 863                         error,
 864                         DBUS_TYPE_STRING, &unit,
 865                         DBUS_TYPE_STRING, &fail,
 866                         DBUS_TYPE_INVALID);
 867         if (r < 0) {
 868                 if (dbus_error_has_name(error, BUS_ERROR_NO_SUCH_UNIT) ||
 869                     dbus_error_has_name(error, BUS_ERROR_LOAD_FAILED)) {
 870
 871                         if (job)
 872                                 *job = NULL;
 873
 874                         dbus_error_free(error);
 875                         return 0;
 876                 }
 877
 878                 log_error("Failed to stop unit %s: %s", unit, bus_error(error, r));
 879                 return r;
 880         }
 881
 882         if (job) {
 883                 const char *j;
 884                 char *copy;
 885
 886                 if (!dbus_message_get_args(reply, error,
 887                                            DBUS_TYPE_OBJECT_PATH, &j,
 888                                            DBUS_TYPE_INVALID)) {
 889                         log_error("Failed to parse reply.");
 890                         return -EIO;
 891                 }
 892
 893                 copy = strdup(j);
 894                 if (!copy)
 895                         return -ENOMEM;
 896
 897                 *job = copy;
 898         }
 899
 900         return 1;
 901 }
 902
 903 int manager_kill_unit(Manager *manager, const char *unit, KillWho who, int signo, DBusError *error) {
 904         _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
 905         const char *w;
 906         int r;
 907
 908         assert(manager);
 909         assert(unit);
 910
 911         w = who == KILL_LEADER ? "process" : "cgroup";
 912         assert_cc(sizeof(signo) == sizeof(int32_t));
 913
 914         r = bus_method_call_with_reply(
 915                         manager->bus,
 916                         "org.freedesktop.systemd1",
 917                         "/org/freedesktop/systemd1",
 918                         "org.freedesktop.systemd1.Manager",
 919                         "KillUnit",
 920                         &reply,
 921                         error,
 922                         DBUS_TYPE_STRING, &unit,
 923                         DBUS_TYPE_STRING, &w,
 924                         DBUS_TYPE_INT32, &signo,
 925                         DBUS_TYPE_INVALID);
 926         if (r < 0) {
 927                 log_error("Failed to stop unit %s: %s", unit, bus_error(error, r));
 928                 return r;
 929         }
 930
 931         return 0;
 932 }
 933
 934 int manager_unit_is_active(Manager *manager, const char *unit) {
 935
 936         const char *interface = "org.freedesktop.systemd1.Unit";
 937         const char *property = "ActiveState";
 938         _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
 939         _cleanup_free_ char *path = NULL;
 940         DBusMessageIter iter, sub;
 941         const char *state;
 942         DBusError error;
 943         int r;
 944
 945         assert(manager);
 946         assert(unit);
 947
 948         dbus_error_init(&error);
 949
 950         path = unit_dbus_path_from_name(unit);
 951         if (!path)
 952                 return -ENOMEM;
 953
 954         r = bus_method_call_with_reply(
 955                         manager->bus,
 956                         "org.freedesktop.systemd1",
 957                         path,
 958                         "org.freedesktop.DBus.Properties",
 959                         "Get",
 960                         &reply,
 961                         &error,
 962                         DBUS_TYPE_STRING, &interface,
 963                         DBUS_TYPE_STRING, &property,
 964                         DBUS_TYPE_INVALID);
 965         if (r < 0) {
 966                 if (dbus_error_has_name(&error, DBUS_ERROR_NO_REPLY) ||
 967                     dbus_error_has_name(&error, DBUS_ERROR_DISCONNECTED)) {
 968                         dbus_error_free(&error);
 969                         return true;
 970                 }
 971
 972                 if (dbus_error_has_name(&error, BUS_ERROR_NO_SUCH_UNIT) ||
 973                     dbus_error_has_name(&error, BUS_ERROR_LOAD_FAILED)) {
 974                         dbus_error_free(&error);
 975                         return false;
 976                 }
 977
 978                 log_error("Failed to query ActiveState: %s", bus_error(&error, r));
 979                 dbus_error_free(&error);
 980                 return r;
 981         }
 982
 983         if (!dbus_message_iter_init(reply, &iter) ||
 984             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
 985                 log_error("Failed to parse reply.");
 986                 return -EINVAL;
 987         }
 988
 989         dbus_message_iter_recurse(&iter, &sub);
 990         if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING) {
 991                 log_error("Failed to parse reply.");
 992                 return -EINVAL;
 993         }
 994
 995         dbus_message_iter_get_basic(&sub, &state);
 996
 997         return !streq(state, "inactive") && !streq(state, "failed");
 998 }