src/machine/machine.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 <string.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25
  26 #include "sd-messages.h"
  27
  28 #include "util.h"
  29 #include "mkdir.h"
  30 #include "hashmap.h"
  31 #include "strv.h"
  32 #include "fileio.h"
  33 #include "special.h"
  34 #include "unit-name.h"
  35 #include "bus-util.h"
  36 #include "bus-error.h"
  37 #include "machine.h"
  38 #include "machine-dbus.h"
  39
  40 Machine* machine_new(Manager *manager, const char *name) {
  41         Machine *m;
  42
  43         assert(manager);
  44         assert(name);
  45
  46         m = new0(Machine, 1);
  47         if (!m)
  48                 return NULL;
  49
  50         m->name = strdup(name);
  51         if (!m->name)
  52                 goto fail;
  53
  54         m->state_file = strappend("/run/systemd/machines/", m->name);
  55         if (!m->state_file)
  56                 goto fail;
  57
  58         if (hashmap_put(manager->machines, m->name, m) < 0)
  59                 goto fail;
  60
  61         m->class = _MACHINE_CLASS_INVALID;
  62         m->manager = manager;
  63
  64         return m;
  65
  66 fail:
  67         free(m->state_file);
  68         free(m->name);
  69         free(m);
  70
  71         return NULL;
  72 }
  73
  74 void machine_free(Machine *m) {
  75         assert(m);
  76
  77         if (m->in_gc_queue)
  78                 LIST_REMOVE(gc_queue, m->manager->machine_gc_queue, m);
  79
  80         if (m->unit) {
  81                 hashmap_remove(m->manager->machine_units, m->unit);
  82                 free(m->unit);
  83         }
  84
  85         free(m->scope_job);
  86
  87         hashmap_remove(m->manager->machines, m->name);
  88
  89         if (m->leader > 0)
  90                 hashmap_remove_value(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m);
  91
  92         sd_bus_message_unref(m->create_message);
  93
  94         free(m->name);
  95         free(m->state_file);
  96         free(m->service);
  97         free(m->root_directory);
  98         free(m->netif);
  99         free(m);
 100 }
 101
 102 int machine_save(Machine *m) {
 103         _cleanup_free_ char *temp_path = NULL;
 104         _cleanup_fclose_ FILE *f = NULL;
 105         int r;
 106
 107         assert(m);
 108         assert(m->state_file);
 109
 110         if (!m->started)
 111                 return 0;
 112
 113         r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0);
 114         if (r < 0)
 115                 goto finish;
 116
 117         r = fopen_temporary(m->state_file, &f, &temp_path);
 118         if (r < 0)
 119                 goto finish;
 120
 121         fchmod(fileno(f), 0644);
 122
 123         fprintf(f,
 124                 "# This is private data. Do not parse.\n"
 125                 "NAME=%s\n",
 126                 m->name);
 127
 128         if (m->unit) {
 129                 _cleanup_free_ char *escaped;
 130
 131                 escaped = cescape(m->unit);
 132                 if (!escaped) {
 133                         r = -ENOMEM;
 134                         goto finish;
 135                 }
 136
 137                 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 */
 138         }
 139
 140         if (m->scope_job)
 141                 fprintf(f, "SCOPE_JOB=%s\n", m->scope_job);
 142
 143         if (m->service) {
 144                 _cleanup_free_ char *escaped;
 145
 146                 escaped = cescape(m->service);
 147                 if (!escaped) {
 148                         r = -ENOMEM;
 149                         goto finish;
 150                 }
 151                 fprintf(f, "SERVICE=%s\n", escaped);
 152         }
 153
 154         if (m->root_directory) {
 155                 _cleanup_free_ char *escaped;
 156
 157                 escaped = cescape(m->root_directory);
 158                 if (!escaped) {
 159                         r = -ENOMEM;
 160                         goto finish;
 161                 }
 162                 fprintf(f, "ROOT=%s\n", escaped);
 163         }
 164
 165         if (!sd_id128_equal(m->id, SD_ID128_NULL))
 166                 fprintf(f, "ID=" SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->id));
 167
 168         if (m->leader != 0)
 169                 fprintf(f, "LEADER="PID_FMT"\n", m->leader);
 170
 171         if (m->class != _MACHINE_CLASS_INVALID)
 172                 fprintf(f, "CLASS=%s\n", machine_class_to_string(m->class));
 173
 174         if (dual_timestamp_is_set(&m->timestamp))
 175                 fprintf(f,
 176                         "REALTIME="USEC_FMT"\n"
 177                         "MONOTONIC="USEC_FMT"\n",
 178                         m->timestamp.realtime,
 179                         m->timestamp.monotonic);
 180
 181         if (m->n_netif > 0) {
 182                 unsigned i;
 183
 184                 fputs("NETIF=", f);
 185
 186                 for (i = 0; i < m->n_netif; i++) {
 187                         if (i != 0)
 188                                 fputc(' ', f);
 189
 190                         fprintf(f, "%i", m->netif[i]);
 191                 }
 192
 193                 fputc('\n', f);
 194         }
 195
 196         r = fflush_and_check(f);
 197         if (r < 0)
 198                 goto finish;
 199
 200         if (rename(temp_path, m->state_file) < 0) {
 201                 r = -errno;
 202                 goto finish;
 203         }
 204
 205         if (m->unit) {
 206                 char *sl;
 207
 208                 /* Create a symlink from the unit name to the machine
 209                  * name, so that we can quickly find the machine for
 210                  * each given unit */
 211                 sl = strappenda("/run/systemd/machines/unit:", m->unit);
 212                 symlink(m->name, sl);
 213         }
 214
 215 finish:
 216         if (r < 0) {
 217                 if (temp_path)
 218                         unlink(temp_path);
 219
 220                 log_error_errno(r, "Failed to save machine data %s: %m", m->state_file);
 221         }
 222
 223         return r;
 224 }
 225
 226 static void machine_unlink(Machine *m) {
 227         assert(m);
 228
 229         if (m->unit) {
 230
 231                 char *sl;
 232
 233                 sl = strappenda("/run/systemd/machines/unit:", m->unit);
 234                 unlink(sl);
 235         }
 236
 237         if (m->state_file)
 238                 unlink(m->state_file);
 239 }
 240
 241 int machine_load(Machine *m) {
 242         _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL, *netif = NULL;
 243         int r;
 244
 245         assert(m);
 246
 247         r = parse_env_file(m->state_file, NEWLINE,
 248                            "SCOPE",     &m->unit,
 249                            "SCOPE_JOB", &m->scope_job,
 250                            "SERVICE",   &m->service,
 251                            "ROOT",      &m->root_directory,
 252                            "ID",        &id,
 253                            "LEADER",    &leader,
 254                            "CLASS",     &class,
 255                            "REALTIME",  &realtime,
 256                            "MONOTONIC", &monotonic,
 257                            "NETIF",     &netif,
 258                            NULL);
 259         if (r < 0) {
 260                 if (r == -ENOENT)
 261                         return 0;
 262
 263                 return log_error_errno(r, "Failed to read %s: %m", m->state_file);
 264         }
 265
 266         if (id)
 267                 sd_id128_from_string(id, &m->id);
 268
 269         if (leader)
 270                 parse_pid(leader, &m->leader);
 271
 272         if (class) {
 273                 MachineClass c;
 274
 275                 c = machine_class_from_string(class);
 276                 if (c >= 0)
 277                         m->class = c;
 278         }
 279
 280         if (realtime) {
 281                 unsigned long long l;
 282                 if (sscanf(realtime, "%llu", &l) > 0)
 283                         m->timestamp.realtime = l;
 284         }
 285
 286         if (monotonic) {
 287                 unsigned long long l;
 288                 if (sscanf(monotonic, "%llu", &l) > 0)
 289                         m->timestamp.monotonic = l;
 290         }
 291
 292         if (netif) {
 293                 size_t l, allocated = 0, nr = 0;
 294                 const char *word, *state;
 295                 int *ni = NULL;
 296
 297                 FOREACH_WORD(word, l, netif, state) {
 298                         char buf[l+1];
 299                         int ifi;
 300
 301                         *(char*) (mempcpy(buf, word, l)) = 0;
 302
 303                         if (safe_atoi(buf, &ifi) < 0)
 304                                 continue;
 305                         if (ifi <= 0)
 306                                 continue;
 307
 308                         if (!GREEDY_REALLOC(ni, allocated, nr+1)) {
 309                                 free(ni);
 310                                 return log_oom();
 311                         }
 312
 313                         ni[nr++] = ifi;
 314                 }
 315
 316                 free(m->netif);
 317                 m->netif = ni;
 318                 m->n_netif = nr;
 319         }
 320
 321         return r;
 322 }
 323
 324 static int machine_start_scope(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
 325         int r = 0;
 326
 327         assert(m);
 328
 329         if (!m->unit) {
 330                 _cleanup_free_ char *escaped = NULL;
 331                 char *scope, *description, *job = NULL;
 332
 333                 escaped = unit_name_escape(m->name);
 334                 if (!escaped)
 335                         return log_oom();
 336
 337                 scope = strjoin("machine-", escaped, ".scope", NULL);
 338                 if (!scope)
 339                         return log_oom();
 340
 341                 description = strappenda(m->class == MACHINE_VM ? "Virtual Machine " : "Container ", m->name);
 342
 343                 r = manager_start_scope(m->manager, scope, m->leader, SPECIAL_MACHINE_SLICE, description, properties, error, &job);
 344                 if (r < 0) {
 345                         log_error("Failed to start machine scope: %s", bus_error_message(error, r));
 346                         free(scope);
 347                         return r;
 348                 } else {
 349                         m->unit = scope;
 350
 351                         free(m->scope_job);
 352                         m->scope_job = job;
 353                 }
 354         }
 355
 356         if (m->unit)
 357                 hashmap_put(m->manager->machine_units, m->unit, m);
 358
 359         return r;
 360 }
 361
 362 int machine_start(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
 363         int r;
 364
 365         assert(m);
 366
 367         if (m->started)
 368                 return 0;
 369
 370         r = hashmap_put(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m);
 371         if (r < 0)
 372                 return r;
 373
 374         /* Create cgroup */
 375         r = machine_start_scope(m, properties, error);
 376         if (r < 0)
 377                 return r;
 378
 379         log_struct(LOG_INFO,
 380                    LOG_MESSAGE_ID(SD_MESSAGE_MACHINE_START),
 381                    "NAME=%s", m->name,
 382                    "LEADER="PID_FMT, m->leader,
 383                    LOG_MESSAGE("New machine %s.", m->name),
 384                    NULL);
 385
 386         if (!dual_timestamp_is_set(&m->timestamp))
 387                 dual_timestamp_get(&m->timestamp);
 388
 389         m->started = true;
 390
 391         /* Save new machine data */
 392         machine_save(m);
 393
 394         machine_send_signal(m, true);
 395
 396         return 0;
 397 }
 398
 399 static int machine_stop_scope(Machine *m) {
 400         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 401         char *job = NULL;
 402         int r;
 403
 404         assert(m);
 405
 406         if (!m->unit)
 407                 return 0;
 408
 409         r = manager_stop_unit(m->manager, m->unit, &error, &job);
 410         if (r < 0) {
 411                 log_error("Failed to stop machine scope: %s", bus_error_message(&error, r));
 412                 return r;
 413         }
 414
 415         free(m->scope_job);
 416         m->scope_job = job;
 417
 418         return 0;
 419 }
 420
 421 int machine_stop(Machine *m) {
 422         int r = 0, k;
 423         assert(m);
 424
 425         if (m->started)
 426                 log_struct(LOG_INFO,
 427                            LOG_MESSAGE_ID(SD_MESSAGE_MACHINE_STOP),
 428                            "NAME=%s", m->name,
 429                            "LEADER="PID_FMT, m->leader,
 430                            LOG_MESSAGE("Machine %s terminated.", m->name),
 431                            NULL);
 432
 433         /* Kill cgroup */
 434         k = machine_stop_scope(m);
 435         if (k < 0)
 436                 r = k;
 437
 438         machine_unlink(m);
 439         machine_add_to_gc_queue(m);
 440
 441         if (m->started)
 442                 machine_send_signal(m, false);
 443
 444         m->started = false;
 445
 446         return r;
 447 }
 448
 449 bool machine_check_gc(Machine *m, bool drop_not_started) {
 450         assert(m);
 451
 452         if (drop_not_started && !m->started)
 453                 return false;
 454
 455         if (m->scope_job && manager_job_is_active(m->manager, m->scope_job))
 456                 return true;
 457
 458         if (m->unit && manager_unit_is_active(m->manager, m->unit))
 459                 return true;
 460
 461         return false;
 462 }
 463
 464 void machine_add_to_gc_queue(Machine *m) {
 465         assert(m);
 466
 467         if (m->in_gc_queue)
 468                 return;
 469
 470         LIST_PREPEND(gc_queue, m->manager->machine_gc_queue, m);
 471         m->in_gc_queue = true;
 472 }
 473
 474 MachineState machine_get_state(Machine *s) {
 475         assert(s);
 476
 477         if (s->scope_job)
 478                 return s->started ? MACHINE_OPENING : MACHINE_CLOSING;
 479
 480         return MACHINE_RUNNING;
 481 }
 482
 483 int machine_kill(Machine *m, KillWho who, int signo) {
 484         assert(m);
 485
 486         if (!m->unit)
 487                 return -ESRCH;
 488
 489         if (who == KILL_LEADER) {
 490                 /* If we shall simply kill the leader, do so directly */
 491
 492                 if (kill(m->leader, signo) < 0)
 493                         return -errno;
 494
 495                 return 0;
 496         }
 497
 498         /* Otherwise make PID 1 do it for us, for the entire cgroup */
 499         return manager_kill_unit(m->manager, m->unit, signo, NULL);
 500 }
 501
 502 static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {
 503         [MACHINE_CONTAINER] = "container",
 504         [MACHINE_VM] = "vm"
 505 };
 506
 507 DEFINE_STRING_TABLE_LOOKUP(machine_class, MachineClass);
 508
 509 static const char* const machine_state_table[_MACHINE_STATE_MAX] = {
 510         [MACHINE_OPENING] = "opening",
 511         [MACHINE_RUNNING] = "running",
 512         [MACHINE_CLOSING] = "closing"
 513 };
 514
 515 DEFINE_STRING_TABLE_LOOKUP(machine_state, MachineState);
 516
 517 static const char* const kill_who_table[_KILL_WHO_MAX] = {
 518         [KILL_LEADER] = "leader",
 519         [KILL_ALL] = "all"
 520 };
 521
 522 DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);