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 "machine.h"
  36 #include "bus-util.h"
  37 #include "bus-error.h"
  38
  39 Machine* machine_new(Manager *manager, const char *name) {
  40         Machine *m;
  41
  42         assert(manager);
  43         assert(name);
  44
  45         m = new0(Machine, 1);
  46         if (!m)
  47                 return NULL;
  48
  49         m->name = strdup(name);
  50         if (!m->name)
  51                 goto fail;
  52
  53         m->state_file = strappend("/run/systemd/machines/", m->name);
  54         if (!m->state_file)
  55                 goto fail;
  56
  57         if (hashmap_put(manager->machines, m->name, m) < 0)
  58                 goto fail;
  59
  60         m->class = _MACHINE_CLASS_INVALID;
  61         m->manager = manager;
  62
  63         return m;
  64
  65 fail:
  66         free(m->state_file);
  67         free(m->name);
  68         free(m);
  69
  70         return NULL;
  71 }
  72
  73 void machine_free(Machine *m) {
  74         assert(m);
  75
  76         if (m->in_gc_queue)
  77                 LIST_REMOVE(gc_queue, m->manager->machine_gc_queue, m);
  78
  79         if (m->unit) {
  80                 hashmap_remove(m->manager->machine_units, m->unit);
  81                 free(m->unit);
  82         }
  83
  84         free(m->scope_job);
  85
  86         hashmap_remove(m->manager->machines, m->name);
  87
  88         if (m->leader > 0)
  89                 hashmap_remove_value(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m);
  90
  91         sd_bus_message_unref(m->create_message);
  92
  93         free(m->name);
  94         free(m->state_file);
  95         free(m->service);
  96         free(m->root_directory);
  97         free(m->netif);
  98         free(m);
  99 }
 100
 101 int machine_save(Machine *m) {
 102         _cleanup_free_ char *temp_path = NULL;
 103         _cleanup_fclose_ FILE *f = NULL;
 104         int r;
 105
 106         assert(m);
 107         assert(m->state_file);
 108
 109         if (!m->started)
 110                 return 0;
 111
 112         r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0);
 113         if (r < 0)
 114                 goto finish;
 115
 116         r = fopen_temporary(m->state_file, &f, &temp_path);
 117         if (r < 0)
 118                 goto finish;
 119
 120         fchmod(fileno(f), 0644);
 121
 122         fprintf(f,
 123                 "# This is private data. Do not parse.\n"
 124                 "NAME=%s\n",
 125                 m->name);
 126
 127         if (m->unit) {
 128                 _cleanup_free_ char *escaped;
 129
 130                 escaped = cescape(m->unit);
 131                 if (!escaped) {
 132                         r = -ENOMEM;
 133                         goto finish;
 134                 }
 135
 136                 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 */
 137         }
 138
 139         if (m->scope_job)
 140                 fprintf(f, "SCOPE_JOB=%s\n", m->scope_job);
 141
 142         if (m->service) {
 143                 _cleanup_free_ char *escaped;
 144
 145                 escaped = cescape(m->service);
 146                 if (!escaped) {
 147                         r = -ENOMEM;
 148                         goto finish;
 149                 }
 150                 fprintf(f, "SERVICE=%s\n", escaped);
 151         }
 152
 153         if (m->root_directory) {
 154                 _cleanup_free_ char *escaped;
 155
 156                 escaped = cescape(m->root_directory);
 157                 if (!escaped) {
 158                         r = -ENOMEM;
 159                         goto finish;
 160                 }
 161                 fprintf(f, "ROOT=%s\n", escaped);
 162         }
 163
 164         if (!sd_id128_equal(m->id, SD_ID128_NULL))
 165                 fprintf(f, "ID=" SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->id));
 166
 167         if (m->leader != 0)
 168                 fprintf(f, "LEADER="PID_FMT"\n", m->leader);
 169
 170         if (m->class != _MACHINE_CLASS_INVALID)
 171                 fprintf(f, "CLASS=%s\n", machine_class_to_string(m->class));
 172
 173         if (dual_timestamp_is_set(&m->timestamp))
 174                 fprintf(f,
 175                         "REALTIME="USEC_FMT"\n"
 176                         "MONOTONIC="USEC_FMT"\n",
 177                         m->timestamp.realtime,
 178                         m->timestamp.monotonic);
 179
 180         if (m->n_netif > 0) {
 181                 unsigned i;
 182
 183                 fputs("NETIF=", f);
 184
 185                 for (i = 0; i < m->n_netif; i++) {
 186                         if (i != 0)
 187                                 fputc(' ', f);
 188
 189                         fprintf(f, "%i", m->netif[i]);
 190                 }
 191
 192                 fputc('\n', f);
 193         }
 194
 195         r = fflush_and_check(f);
 196         if (r < 0)
 197                 goto finish;
 198
 199         if (rename(temp_path, m->state_file) < 0) {
 200                 r = -errno;
 201                 goto finish;
 202         }
 203
 204         if (m->unit) {
 205                 char *sl;
 206
 207                 /* Create a symlink from the unit name to the machine
 208                  * name, so that we can quickly find the machine for
 209                  * each given unit */
 210                 sl = strappenda("/run/systemd/machines/unit:", m->unit);
 211                 symlink(m->name, sl);
 212         }
 213
 214 finish:
 215         if (r < 0) {
 216                 if (temp_path)
 217                         unlink(temp_path);
 218
 219                 log_error("Failed to save machine data %s: %s", m->state_file, strerror(-r));
 220         }
 221
 222         return r;
 223 }
 224
 225 static void machine_unlink(Machine *m) {
 226         assert(m);
 227
 228         if (m->unit) {
 229
 230                 char *sl;
 231
 232                 sl = strappenda("/run/systemd/machines/unit:", m->unit);
 233                 unlink(sl);
 234         }
 235
 236         if (m->state_file)
 237                 unlink(m->state_file);
 238 }
 239
 240 int machine_load(Machine *m) {
 241         _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL, *netif = NULL;
 242         int r;
 243
 244         assert(m);
 245
 246         r = parse_env_file(m->state_file, NEWLINE,
 247                            "SCOPE",     &m->unit,
 248                            "SCOPE_JOB", &m->scope_job,
 249                            "SERVICE",   &m->service,
 250                            "ROOT",      &m->root_directory,
 251                            "ID",        &id,
 252                            "LEADER",    &leader,
 253                            "CLASS",     &class,
 254                            "REALTIME",  &realtime,
 255                            "MONOTONIC", &monotonic,
 256                            "NETIF",     &netif,
 257                            NULL);
 258         if (r < 0) {
 259                 if (r == -ENOENT)
 260                         return 0;
 261
 262                 log_error("Failed to read %s: %s", m->state_file, strerror(-r));
 263                 return r;
 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                    MESSAGE_ID(SD_MESSAGE_MACHINE_START),
 381                    "NAME=%s", m->name,
 382                    "LEADER="PID_FMT, m->leader,
 383                    "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         if (!m->registered) {
 410                 r = manager_stop_unit(m->manager, m->unit, &error, &job);
 411                 if (r < 0) {
 412                         log_error("Failed to stop machine scope: %s", bus_error_message(&error, r));
 413                         return r;
 414                 }
 415         }
 416
 417         free(m->scope_job);
 418         m->scope_job = job;
 419
 420         return 0;
 421 }
 422
 423 int machine_stop(Machine *m) {
 424         int r = 0, k;
 425         assert(m);
 426
 427         if (m->started)
 428                 log_struct(LOG_INFO,
 429                            MESSAGE_ID(SD_MESSAGE_MACHINE_STOP),
 430                            "NAME=%s", m->name,
 431                            "LEADER="PID_FMT, m->leader,
 432                            "MESSAGE=Machine %s terminated.", m->name,
 433                            NULL);
 434
 435         /* Kill cgroup */
 436         k = machine_stop_scope(m);
 437         if (k < 0)
 438                 r = k;
 439
 440         machine_unlink(m);
 441         machine_add_to_gc_queue(m);
 442
 443         if (m->started)
 444                 machine_send_signal(m, false);
 445
 446         m->started = false;
 447
 448         return r;
 449 }
 450
 451 bool machine_check_gc(Machine *m, bool drop_not_started) {
 452         assert(m);
 453
 454         if (drop_not_started && !m->started)
 455                 return false;
 456
 457         if (m->scope_job && manager_job_is_active(m->manager, m->scope_job))
 458                 return true;
 459
 460         if (m->unit && manager_unit_is_active(m->manager, m->unit))
 461                 return true;
 462
 463         return false;
 464 }
 465
 466 void machine_add_to_gc_queue(Machine *m) {
 467         assert(m);
 468
 469         if (m->in_gc_queue)
 470                 return;
 471
 472         LIST_PREPEND(gc_queue, m->manager->machine_gc_queue, m);
 473         m->in_gc_queue = true;
 474 }
 475
 476 MachineState machine_get_state(Machine *s) {
 477         assert(s);
 478
 479         if (s->scope_job)
 480                 return s->started ? MACHINE_OPENING : MACHINE_CLOSING;
 481
 482         return MACHINE_RUNNING;
 483 }
 484
 485 int machine_kill(Machine *m, KillWho who, int signo) {
 486         assert(m);
 487
 488         if (!m->unit)
 489                 return -ESRCH;
 490
 491         if (who == KILL_LEADER) {
 492                 /* If we shall simply kill the leader, do so directly */
 493
 494                 if (kill(m->leader, signo) < 0)
 495                         return -errno;
 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);