src/machine/machine.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <errno.h>
   4 #include <unistd.h>
   5 #include <sys/stat.h>
   6
   7 #include "sd-messages.h"
   8
   9 #include "alloc-util.h"
  10 #include "bus-error.h"
  11 #include "bus-util.h"
  12 #include "env-file.h"
  13 #include "errno-util.h"
  14 #include "escape.h"
  15 #include "extract-word.h"
  16 #include "fd-util.h"
  17 #include "fileio.h"
  18 #include "format-util.h"
  19 #include "hashmap.h"
  20 #include "machine-dbus.h"
  21 #include "machine.h"
  22 #include "mkdir-label.h"
  23 #include "parse-util.h"
  24 #include "path-util.h"
  25 #include "process-util.h"
  26 #include "serialize.h"
  27 #include "special.h"
  28 #include "stdio-util.h"
  29 #include "string-table.h"
  30 #include "terminal-util.h"
  31 #include "tmpfile-util.h"
  32 #include "unit-name.h"
  33 #include "user-util.h"
  34 #include "util.h"
  35
  36 Machine* machine_new(Manager *manager, MachineClass class, const char *name) {
  37         Machine *m;
  38
  39         assert(manager);
  40         assert(class < _MACHINE_CLASS_MAX);
  41         assert(name);
  42
  43         /* Passing class == _MACHINE_CLASS_INVALID here is fine. It
  44          * means as much as "we don't know yet", and that we'll figure
  45          * it out later when loading the state file. */
  46
  47         m = new0(Machine, 1);
  48         if (!m)
  49                 return NULL;
  50
  51         m->name = strdup(name);
  52         if (!m->name)
  53                 goto fail;
  54
  55         if (class != MACHINE_HOST) {
  56                 m->state_file = path_join("/run/systemd/machines", m->name);
  57                 if (!m->state_file)
  58                         goto fail;
  59         }
  60
  61         m->class = class;
  62
  63         if (hashmap_put(manager->machines, m->name, m) < 0)
  64                 goto fail;
  65
  66         m->manager = manager;
  67
  68         return m;
  69
  70 fail:
  71         free(m->state_file);
  72         free(m->name);
  73         return mfree(m);
  74 }
  75
  76 Machine* machine_free(Machine *m) {
  77         if (!m)
  78                 return NULL;
  79
  80         while (m->operations)
  81                 operation_free(m->operations);
  82
  83         if (m->in_gc_queue)
  84                 LIST_REMOVE(gc_queue, m->manager->machine_gc_queue, m);
  85
  86         machine_release_unit(m);
  87
  88         free(m->scope_job);
  89
  90         (void) hashmap_remove(m->manager->machines, m->name);
  91
  92         if (m->manager->host_machine == m)
  93                 m->manager->host_machine = NULL;
  94
  95         if (m->leader > 0)
  96                 (void) hashmap_remove_value(m->manager->machine_leaders, PID_TO_PTR(m->leader), m);
  97
  98         sd_bus_message_unref(m->create_message);
  99
 100         free(m->name);
 101         free(m->state_file);
 102         free(m->service);
 103         free(m->root_directory);
 104         free(m->netif);
 105         return mfree(m);
 106 }
 107
 108 int machine_save(Machine *m) {
 109         _cleanup_free_ char *temp_path = NULL;
 110         _cleanup_fclose_ FILE *f = NULL;
 111         int r;
 112
 113         assert(m);
 114
 115         if (!m->state_file)
 116                 return 0;
 117
 118         if (!m->started)
 119                 return 0;
 120
 121         r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0, MKDIR_WARN_MODE);
 122         if (r < 0)
 123                 goto fail;
 124
 125         r = fopen_temporary(m->state_file, &f, &temp_path);
 126         if (r < 0)
 127                 goto fail;
 128
 129         (void) fchmod(fileno(f), 0644);
 130
 131         fprintf(f,
 132                 "# This is private data. Do not parse.\n"
 133                 "NAME=%s\n",
 134                 m->name);
 135
 136         if (m->unit) {
 137                 _cleanup_free_ char *escaped = NULL;
 138
 139                 escaped = cescape(m->unit);
 140                 if (!escaped) {
 141                         r = -ENOMEM;
 142                         goto fail;
 143                 }
 144
 145                 fprintf(f, "SCOPE=%s\n", escaped); /* We continue to call this "SCOPE=" because it is internal only, and we want to stay compatible with old files */
 146         }
 147
 148         if (m->scope_job)
 149                 fprintf(f, "SCOPE_JOB=%s\n", m->scope_job);
 150
 151         if (m->service) {
 152                 _cleanup_free_ char *escaped = NULL;
 153
 154                 escaped = cescape(m->service);
 155                 if (!escaped) {
 156                         r = -ENOMEM;
 157                         goto fail;
 158                 }
 159                 fprintf(f, "SERVICE=%s\n", escaped);
 160         }
 161
 162         if (m->root_directory) {
 163                 _cleanup_free_ char *escaped = NULL;
 164
 165                 escaped = cescape(m->root_directory);
 166                 if (!escaped) {
 167                         r = -ENOMEM;
 168                         goto fail;
 169                 }
 170                 fprintf(f, "ROOT=%s\n", escaped);
 171         }
 172
 173         if (!sd_id128_is_null(m->id))
 174                 fprintf(f, "ID=" SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->id));
 175
 176         if (m->leader != 0)
 177                 fprintf(f, "LEADER="PID_FMT"\n", m->leader);
 178
 179         if (m->class != _MACHINE_CLASS_INVALID)
 180                 fprintf(f, "CLASS=%s\n", machine_class_to_string(m->class));
 181
 182         if (dual_timestamp_is_set(&m->timestamp))
 183                 fprintf(f,
 184                         "REALTIME="USEC_FMT"\n"
 185                         "MONOTONIC="USEC_FMT"\n",
 186                         m->timestamp.realtime,
 187                         m->timestamp.monotonic);
 188
 189         if (m->n_netif > 0) {
 190                 size_t i;
 191
 192                 fputs("NETIF=", f);
 193
 194                 for (i = 0; i < m->n_netif; i++) {
 195                         if (i != 0)
 196                                 fputc(' ', f);
 197
 198                         fprintf(f, "%i", m->netif[i]);
 199                 }
 200
 201                 fputc('\n', f);
 202         }
 203
 204         r = fflush_and_check(f);
 205         if (r < 0)
 206                 goto fail;
 207
 208         if (rename(temp_path, m->state_file) < 0) {
 209                 r = -errno;
 210                 goto fail;
 211         }
 212
 213         if (m->unit) {
 214                 char *sl;
 215
 216                 /* Create a symlink from the unit name to the machine
 217                  * name, so that we can quickly find the machine for
 218                  * each given unit. Ignore error. */
 219                 sl = strjoina("/run/systemd/machines/unit:", m->unit);
 220                 (void) symlink(m->name, sl);
 221         }
 222
 223         return 0;
 224
 225 fail:
 226         (void) unlink(m->state_file);
 227
 228         if (temp_path)
 229                 (void) unlink(temp_path);
 230
 231         return log_error_errno(r, "Failed to save machine data %s: %m", m->state_file);
 232 }
 233
 234 static void machine_unlink(Machine *m) {
 235         assert(m);
 236
 237         if (m->unit) {
 238                 char *sl;
 239
 240                 sl = strjoina("/run/systemd/machines/unit:", m->unit);
 241                 (void) unlink(sl);
 242         }
 243
 244         if (m->state_file)
 245                 (void) unlink(m->state_file);
 246 }
 247
 248 int machine_load(Machine *m) {
 249         _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL, *netif = NULL;
 250         int r;
 251
 252         assert(m);
 253
 254         if (!m->state_file)
 255                 return 0;
 256
 257         r = parse_env_file(NULL, m->state_file,
 258                            "SCOPE",     &m->unit,
 259                            "SCOPE_JOB", &m->scope_job,
 260                            "SERVICE",   &m->service,
 261                            "ROOT",      &m->root_directory,
 262                            "ID",        &id,
 263                            "LEADER",    &leader,
 264                            "CLASS",     &class,
 265                            "REALTIME",  &realtime,
 266                            "MONOTONIC", &monotonic,
 267                            "NETIF",     &netif);
 268         if (r == -ENOENT)
 269                 return 0;
 270         if (r < 0)
 271                 return log_error_errno(r, "Failed to read %s: %m", m->state_file);
 272
 273         if (id)
 274                 sd_id128_from_string(id, &m->id);
 275
 276         if (leader)
 277                 parse_pid(leader, &m->leader);
 278
 279         if (class) {
 280                 MachineClass c;
 281
 282                 c = machine_class_from_string(class);
 283                 if (c >= 0)
 284                         m->class = c;
 285         }
 286
 287         if (realtime)
 288                 (void) deserialize_usec(realtime, &m->timestamp.realtime);
 289         if (monotonic)
 290                 (void) deserialize_usec(monotonic, &m->timestamp.monotonic);
 291
 292         if (netif) {
 293                 _cleanup_free_ int *ni = NULL;
 294                 size_t nr = 0;
 295                 const char *p;
 296
 297                 p = netif;
 298                 for (;;) {
 299                         _cleanup_free_ char *word = NULL;
 300
 301                         r = extract_first_word(&p, &word, NULL, 0);
 302                         if (r == 0)
 303                                 break;
 304                         if (r == -ENOMEM)
 305                                 return log_oom();
 306                         if (r < 0) {
 307                                 log_warning_errno(r, "Failed to parse NETIF: %s", netif);
 308                                 break;
 309                         }
 310
 311                         r = parse_ifindex(word);
 312                         if (r < 0)
 313                                 continue;
 314
 315                         if (!GREEDY_REALLOC(ni, nr + 1))
 316                                 return log_oom();
 317
 318                         ni[nr++] = r;
 319                 }
 320
 321                 free_and_replace(m->netif, ni);
 322                 m->n_netif = nr;
 323         }
 324
 325         return r;
 326 }
 327
 328 static int machine_start_scope(
 329                 Machine *machine,
 330                 sd_bus_message *more_properties,
 331                 sd_bus_error *error) {
 332
 333         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL;
 334         _cleanup_free_ char *escaped = NULL, *unit = NULL;
 335         const char *description;
 336         int r;
 337
 338         assert(machine);
 339         assert(machine->leader > 0);
 340         assert(!machine->unit);
 341
 342         escaped = unit_name_escape(machine->name);
 343         if (!escaped)
 344                 return log_oom();
 345
 346         unit = strjoin("machine-", escaped, ".scope");
 347         if (!unit)
 348                 return log_oom();
 349
 350         r = sd_bus_message_new_method_call(
 351                         machine->manager->bus,
 352                         &m,
 353                         "org.freedesktop.systemd1",
 354                         "/org/freedesktop/systemd1",
 355                         "org.freedesktop.systemd1.Manager",
 356                         "StartTransientUnit");
 357         if (r < 0)
 358                 return r;
 359
 360         r = sd_bus_message_append(m, "ss", unit, "fail");
 361         if (r < 0)
 362                 return r;
 363
 364         r = sd_bus_message_open_container(m, 'a', "(sv)");
 365         if (r < 0)
 366                 return r;
 367
 368         r = sd_bus_message_append(m, "(sv)", "Slice", "s", SPECIAL_MACHINE_SLICE);
 369         if (r < 0)
 370                 return r;
 371
 372         description = strjoina(machine->class == MACHINE_VM ? "Virtual Machine " : "Container ", machine->name);
 373         r = sd_bus_message_append(m, "(sv)", "Description", "s", description);
 374         if (r < 0)
 375                 return r;
 376
 377         r = sd_bus_message_append(m, "(sv)(sv)(sv)(sv)(sv)",
 378                                   "PIDs", "au", 1, machine->leader,
 379                                   "Delegate", "b", 1,
 380                                   "CollectMode", "s", "inactive-or-failed",
 381                                   "AddRef", "b", 1,
 382                                   "TasksMax", "t", UINT64_C(16384));
 383         if (r < 0)
 384                 return r;
 385
 386         if (more_properties) {
 387                 r = sd_bus_message_copy(m, more_properties, true);
 388                 if (r < 0)
 389                         return r;
 390         }
 391
 392         r = sd_bus_message_close_container(m);
 393         if (r < 0)
 394                 return r;
 395
 396         r = sd_bus_message_append(m, "a(sa(sv))", 0);
 397         if (r < 0)
 398                 return r;
 399
 400         r = sd_bus_call(NULL, m, 0, error, &reply);
 401         if (r < 0)
 402                 return r;
 403
 404         machine->unit = TAKE_PTR(unit);
 405         machine->referenced = true;
 406
 407         const char *job;
 408         r = sd_bus_message_read(reply, "o", &job);
 409         if (r < 0)
 410                 return r;
 411
 412         return free_and_strdup(&machine->scope_job, job);
 413 }
 414
 415 static int machine_ensure_scope(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
 416         int r;
 417
 418         assert(m);
 419         assert(m->class != MACHINE_HOST);
 420
 421         if (!m->unit) {
 422                 r = machine_start_scope(m, properties, error);
 423                 if (r < 0)
 424                         return log_error_errno(r, "Failed to start machine scope: %s", bus_error_message(error, r));
 425         }
 426
 427         assert(m->unit);
 428         hashmap_put(m->manager->machine_units, m->unit, m);
 429
 430         return 0;
 431 }
 432
 433 int machine_start(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
 434         int r;
 435
 436         assert(m);
 437
 438         if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
 439                 return -EOPNOTSUPP;
 440
 441         if (m->started)
 442                 return 0;
 443
 444         r = hashmap_put(m->manager->machine_leaders, PID_TO_PTR(m->leader), m);
 445         if (r < 0)
 446                 return r;
 447
 448         /* Create cgroup */
 449         r = machine_ensure_scope(m, properties, error);
 450         if (r < 0)
 451                 return r;
 452
 453         log_struct(LOG_INFO,
 454                    "MESSAGE_ID=" SD_MESSAGE_MACHINE_START_STR,
 455                    "NAME=%s", m->name,
 456                    "LEADER="PID_FMT, m->leader,
 457                    LOG_MESSAGE("New machine %s.", m->name));
 458
 459         if (!dual_timestamp_is_set(&m->timestamp))
 460                 dual_timestamp_get(&m->timestamp);
 461
 462         m->started = true;
 463
 464         /* Save new machine data */
 465         machine_save(m);
 466
 467         machine_send_signal(m, true);
 468         (void) manager_enqueue_nscd_cache_flush(m->manager);
 469
 470         return 0;
 471 }
 472
 473 int machine_stop(Machine *m) {
 474         int r;
 475
 476         assert(m);
 477
 478         if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
 479                 return -EOPNOTSUPP;
 480
 481         if (m->unit) {
 482                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 483                 char *job = NULL;
 484
 485                 r = manager_stop_unit(m->manager, m->unit, &error, &job);
 486                 if (r < 0)
 487                         return log_error_errno(r, "Failed to stop machine scope: %s", bus_error_message(&error, r));
 488
 489                 free_and_replace(m->scope_job, job);
 490         }
 491
 492         m->stopping = true;
 493
 494         machine_save(m);
 495         (void) manager_enqueue_nscd_cache_flush(m->manager);
 496
 497         return 0;
 498 }
 499
 500 int machine_finalize(Machine *m) {
 501         assert(m);
 502
 503         if (m->started) {
 504                 log_struct(LOG_INFO,
 505                            "MESSAGE_ID=" SD_MESSAGE_MACHINE_STOP_STR,
 506                            "NAME=%s", m->name,
 507                            "LEADER="PID_FMT, m->leader,
 508                            LOG_MESSAGE("Machine %s terminated.", m->name));
 509
 510                 m->stopping = true; /* The machine is supposed to be going away. Don't try to kill it. */
 511         }
 512
 513         machine_unlink(m);
 514         machine_add_to_gc_queue(m);
 515
 516         if (m->started) {
 517                 machine_send_signal(m, false);
 518                 m->started = false;
 519         }
 520
 521         return 0;
 522 }
 523
 524 bool machine_may_gc(Machine *m, bool drop_not_started) {
 525         assert(m);
 526
 527         if (m->class == MACHINE_HOST)
 528                 return false;
 529
 530         if (drop_not_started && !m->started)
 531                 return true;
 532
 533         if (m->scope_job && manager_job_is_active(m->manager, m->scope_job))
 534                 return false;
 535
 536         if (m->unit && manager_unit_is_active(m->manager, m->unit))
 537                 return false;
 538
 539         return true;
 540 }
 541
 542 void machine_add_to_gc_queue(Machine *m) {
 543         assert(m);
 544
 545         if (m->in_gc_queue)
 546                 return;
 547
 548         LIST_PREPEND(gc_queue, m->manager->machine_gc_queue, m);
 549         m->in_gc_queue = true;
 550 }
 551
 552 MachineState machine_get_state(Machine *s) {
 553         assert(s);
 554
 555         if (s->class == MACHINE_HOST)
 556                 return MACHINE_RUNNING;
 557
 558         if (s->stopping)
 559                 return MACHINE_CLOSING;
 560
 561         if (s->scope_job)
 562                 return MACHINE_OPENING;
 563
 564         return MACHINE_RUNNING;
 565 }
 566
 567 int machine_kill(Machine *m, KillWho who, int signo) {
 568         assert(m);
 569
 570         if (!IN_SET(m->class, MACHINE_VM, MACHINE_CONTAINER))
 571                 return -EOPNOTSUPP;
 572
 573         if (!m->unit)
 574                 return -ESRCH;
 575
 576         if (who == KILL_LEADER) /* If we shall simply kill the leader, do so directly */
 577                 return RET_NERRNO(kill(m->leader, signo));
 578
 579         /* Otherwise, make PID 1 do it for us, for the entire cgroup */
 580         return manager_kill_unit(m->manager, m->unit, signo, NULL);
 581 }
 582
 583 int machine_openpt(Machine *m, int flags, char **ret_slave) {
 584         assert(m);
 585
 586         switch (m->class) {
 587
 588         case MACHINE_HOST:
 589
 590                 return openpt_allocate(flags, ret_slave);
 591
 592         case MACHINE_CONTAINER:
 593                 if (m->leader <= 0)
 594                         return -EINVAL;
 595
 596                 return openpt_allocate_in_namespace(m->leader, flags, ret_slave);
 597
 598         default:
 599                 return -EOPNOTSUPP;
 600         }
 601 }
 602
 603 int machine_open_terminal(Machine *m, const char *path, int mode) {
 604         assert(m);
 605
 606         switch (m->class) {
 607
 608         case MACHINE_HOST:
 609                 return open_terminal(path, mode);
 610
 611         case MACHINE_CONTAINER:
 612                 if (m->leader <= 0)
 613                         return -EINVAL;
 614
 615                 return open_terminal_in_namespace(m->leader, path, mode);
 616
 617         default:
 618                 return -EOPNOTSUPP;
 619         }
 620 }
 621
 622 void machine_release_unit(Machine *m) {
 623         assert(m);
 624
 625         if (!m->unit)
 626                 return;
 627
 628         if (m->referenced) {
 629                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 630                 int r;
 631
 632                 r = manager_unref_unit(m->manager, m->unit, &error);
 633                 if (r < 0)
 634                         log_warning_errno(r, "Failed to drop reference to machine scope, ignoring: %s",
 635                                           bus_error_message(&error, r));
 636
 637                 m->referenced = false;
 638         }
 639
 640         (void) hashmap_remove(m->manager->machine_units, m->unit);
 641         m->unit = mfree(m->unit);
 642 }
 643
 644 int machine_get_uid_shift(Machine *m, uid_t *ret) {
 645         char p[STRLEN("/proc//uid_map") + DECIMAL_STR_MAX(pid_t) + 1];
 646         uid_t uid_base, uid_shift, uid_range;
 647         gid_t gid_base, gid_shift, gid_range;
 648         _cleanup_fclose_ FILE *f = NULL;
 649         int k, r;
 650
 651         assert(m);
 652         assert(ret);
 653
 654         /* Return the base UID/GID of the specified machine. Note that this only works for containers with simple
 655          * mappings. In most cases setups should be simple like this, and administrators should only care about the
 656          * basic offset a container has relative to the host. This is what this function exposes.
 657          *
 658          * If we encounter any more complex mappings we politely refuse this with ENXIO. */
 659
 660         if (m->class == MACHINE_HOST) {
 661                 *ret = 0;
 662                 return 0;
 663         }
 664
 665         if (m->class != MACHINE_CONTAINER)
 666                 return -EOPNOTSUPP;
 667
 668         xsprintf(p, "/proc/" PID_FMT "/uid_map", m->leader);
 669         f = fopen(p, "re");
 670         if (!f) {
 671                 if (errno == ENOENT) {
 672                         /* If the file doesn't exist, user namespacing is off in the kernel, return a zero mapping hence. */
 673                         *ret = 0;
 674                         return 0;
 675                 }
 676
 677                 return -errno;
 678         }
 679
 680         /* Read the first line. There's at least one. */
 681         errno = 0;
 682         k = fscanf(f, UID_FMT " " UID_FMT " " UID_FMT "\n", &uid_base, &uid_shift, &uid_range);
 683         if (k != 3) {
 684                 if (ferror(f))
 685                         return errno_or_else(EIO);
 686
 687                 return -EBADMSG;
 688         }
 689
 690         /* Not a mapping starting at 0? Then it's a complex mapping we can't expose here. */
 691         if (uid_base != 0)
 692                 return -ENXIO;
 693         /* Insist that at least the nobody user is mapped, everything else is weird, and hence complex, and we don't support it */
 694         if (uid_range < UID_NOBODY)
 695                 return -ENXIO;
 696
 697         /* If there's more than one line, then we don't support this mapping. */
 698         r = safe_fgetc(f, NULL);
 699         if (r < 0)
 700                 return r;
 701         if (r != 0) /* Insist on EOF */
 702                 return -ENXIO;
 703
 704         fclose(f);
 705
 706         xsprintf(p, "/proc/" PID_FMT "/gid_map", m->leader);
 707         f = fopen(p, "re");
 708         if (!f)
 709                 return -errno;
 710
 711         /* Read the first line. There's at least one. */
 712         errno = 0;
 713         k = fscanf(f, GID_FMT " " GID_FMT " " GID_FMT "\n", &gid_base, &gid_shift, &gid_range);
 714         if (k != 3) {
 715                 if (ferror(f))
 716                         return errno_or_else(EIO);
 717
 718                 return -EBADMSG;
 719         }
 720
 721         /* If there's more than one line, then we don't support this file. */
 722         r = safe_fgetc(f, NULL);
 723         if (r < 0)
 724                 return r;
 725         if (r != 0) /* Insist on EOF */
 726                 return -ENXIO;
 727
 728         /* If the UID and GID mapping doesn't match, we don't support this mapping. */
 729         if (uid_base != (uid_t) gid_base)
 730                 return -ENXIO;
 731         if (uid_shift != (uid_t) gid_shift)
 732                 return -ENXIO;
 733         if (uid_range != (uid_t) gid_range)
 734                 return -ENXIO;
 735
 736         *ret = uid_shift;
 737         return 0;
 738 }
 739
 740 static int machine_owns_uid_internal(
 741                 Machine *machine,
 742                 const char *map_file, /* "uid_map" or "gid_map" */
 743                 uid_t uid,
 744                 uid_t *ret_internal_uid) {
 745
 746         _cleanup_fclose_ FILE *f = NULL;
 747         const char *p;
 748
 749         /* This is a generic implementation for both uids and gids, under the assumptions they have the same types and semantics. */
 750         assert_cc(sizeof(uid_t) == sizeof(gid_t));
 751
 752         assert(machine);
 753
 754         /* Checks if the specified host UID is owned by the machine, and returns the UID it maps to
 755          * internally in the machine */
 756
 757         if (machine->class != MACHINE_CONTAINER)
 758                 goto negative;
 759
 760         p = procfs_file_alloca(machine->leader, map_file);
 761         f = fopen(p, "re");
 762         if (!f) {
 763                 log_debug_errno(errno, "Failed to open %s, ignoring.", p);
 764                 goto negative;
 765         }
 766
 767         for (;;) {
 768                 uid_t uid_base, uid_shift, uid_range, converted;
 769                 int k;
 770
 771                 errno = 0;
 772                 k = fscanf(f, UID_FMT " " UID_FMT " " UID_FMT, &uid_base, &uid_shift, &uid_range);
 773                 if (k < 0 && feof(f))
 774                         break;
 775                 if (k != 3) {
 776                         if (ferror(f))
 777                                 return errno_or_else(EIO);
 778
 779                         return -EIO;
 780                 }
 781
 782                 /* The private user namespace is disabled, ignoring. */
 783                 if (uid_shift == 0)
 784                         continue;
 785
 786                 if (uid < uid_shift || uid >= uid_shift + uid_range)
 787                         continue;
 788
 789                 converted = (uid - uid_shift + uid_base);
 790                 if (!uid_is_valid(converted))
 791                         return -EINVAL;
 792
 793                 if (ret_internal_uid)
 794                         *ret_internal_uid = converted;
 795
 796                 return true;
 797         }
 798
 799 negative:
 800         if (ret_internal_uid)
 801                 *ret_internal_uid = UID_INVALID;
 802
 803         return false;
 804 }
 805
 806 int machine_owns_uid(Machine *machine, uid_t uid, uid_t *ret_internal_uid) {
 807         return machine_owns_uid_internal(machine, "uid_map", uid, ret_internal_uid);
 808 }
 809
 810 int machine_owns_gid(Machine *machine, gid_t gid, gid_t *ret_internal_gid) {
 811         return machine_owns_uid_internal(machine, "gid_map", (uid_t) gid, (uid_t*) ret_internal_gid);
 812 }
 813
 814 static int machine_translate_uid_internal(
 815                 Machine *machine,
 816                 const char *map_file, /* "uid_map" or "gid_map" */
 817                 uid_t uid,
 818                 uid_t *ret_host_uid) {
 819
 820         _cleanup_fclose_ FILE *f = NULL;
 821         const char *p;
 822
 823         /* This is a generic implementation for both uids and gids, under the assumptions they have the same types and semantics. */
 824         assert_cc(sizeof(uid_t) == sizeof(gid_t));
 825
 826         assert(machine);
 827         assert(uid_is_valid(uid));
 828
 829         if (machine->class != MACHINE_CONTAINER)
 830                 return -ESRCH;
 831
 832         /* Translates a machine UID into a host UID */
 833
 834         p = procfs_file_alloca(machine->leader, map_file);
 835         f = fopen(p, "re");
 836         if (!f)
 837                 return -errno;
 838
 839         for (;;) {
 840                 uid_t uid_base, uid_shift, uid_range, converted;
 841                 int k;
 842
 843                 errno = 0;
 844                 k = fscanf(f, UID_FMT " " UID_FMT " " UID_FMT, &uid_base, &uid_shift, &uid_range);
 845                 if (k < 0 && feof(f))
 846                         break;
 847                 if (k != 3) {
 848                         if (ferror(f))
 849                                 return errno_or_else(EIO);
 850
 851                         return -EIO;
 852                 }
 853
 854                 if (uid < uid_base || uid >= uid_base + uid_range)
 855                         continue;
 856
 857                 converted = uid - uid_base + uid_shift;
 858                 if (!uid_is_valid(converted))
 859                         return -EINVAL;
 860
 861                 if (ret_host_uid)
 862                         *ret_host_uid = converted;
 863                 return 0;
 864         }
 865
 866         return -ESRCH;
 867 }
 868
 869 int machine_translate_uid(Machine *machine, gid_t uid, gid_t *ret_host_uid) {
 870         return machine_translate_uid_internal(machine, "uid_map", uid, ret_host_uid);
 871 }
 872
 873 int machine_translate_gid(Machine *machine, gid_t gid, gid_t *ret_host_gid) {
 874         return machine_translate_uid_internal(machine, "gid_map", (uid_t) gid, (uid_t*) ret_host_gid);
 875 }
 876
 877 static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {
 878         [MACHINE_CONTAINER] = "container",
 879         [MACHINE_VM] = "vm",
 880         [MACHINE_HOST] = "host",
 881 };
 882
 883 DEFINE_STRING_TABLE_LOOKUP(machine_class, MachineClass);
 884
 885 static const char* const machine_state_table[_MACHINE_STATE_MAX] = {
 886         [MACHINE_OPENING] = "opening",
 887         [MACHINE_RUNNING] = "running",
 888         [MACHINE_CLOSING] = "closing"
 889 };
 890
 891 DEFINE_STRING_TABLE_LOOKUP(machine_state, MachineState);
 892
 893 static const char* const kill_who_table[_KILL_WHO_MAX] = {
 894         [KILL_LEADER] = "leader",
 895         [KILL_ALL] = "all"
 896 };
 897
 898 DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);