src/main.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <dbus/dbus.h>
  23
  24 #include <stdio.h>
  25 #include <errno.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <getopt.h>
  31 #include <signal.h>
  32 #include <sys/wait.h>
  33 #include <fcntl.h>
  34
  35 #include "manager.h"
  36 #include "log.h"
  37 #include "mount-setup.h"
  38 #include "hostname-setup.h"
  39 #include "loopback-setup.h"
  40 #include "kmod-setup.h"
  41 #include "load-fragment.h"
  42 #include "fdset.h"
  43 #include "special.h"
  44 #include "conf-parser.h"
  45 #include "bus-errors.h"
  46 #include "missing.h"
  47 #include "label.h"
  48 #include "build.h"
  49
  50 static enum {
  51         ACTION_RUN,
  52         ACTION_HELP,
  53         ACTION_TEST,
  54         ACTION_DUMP_CONFIGURATION_ITEMS,
  55         ACTION_DONE
  56 } arg_action = ACTION_RUN;
  57
  58 static char *arg_default_unit = NULL;
  59 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  60
  61 static bool arg_dump_core = true;
  62 static bool arg_crash_shell = false;
  63 static int arg_crash_chvt = -1;
  64 static bool arg_confirm_spawn = false;
  65 static bool arg_show_status = true;
  66 static bool arg_sysv_console = true;
  67 static bool arg_mount_auto = true;
  68 static bool arg_swap_auto = true;
  69 static char *arg_console = NULL;
  70
  71 static FILE* serialization = NULL;
  72
  73 _noreturn_ static void freeze(void) {
  74         for (;;)
  75                 pause();
  76 }
  77
  78 static void nop_handler(int sig) {
  79 }
  80
  81 _noreturn_ static void crash(int sig) {
  82
  83         if (!arg_dump_core)
  84                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  85         else {
  86                 struct sigaction sa;
  87                 pid_t pid;
  88
  89                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  90                 zero(sa);
  91                 sa.sa_handler = nop_handler;
  92                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  93                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  94
  95                 if ((pid = fork()) < 0)
  96                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  97
  98                 else if (pid == 0) {
  99                         struct rlimit rl;
 100
 101                         /* Enable default signal handler for core dump */
 102                         zero(sa);
 103                         sa.sa_handler = SIG_DFL;
 104                         assert_se(sigaction(sig, &sa, NULL) == 0);
 105
 106                         /* Don't limit the core dump size */
 107                         zero(rl);
 108                         rl.rlim_cur = RLIM_INFINITY;
 109                         rl.rlim_max = RLIM_INFINITY;
 110                         setrlimit(RLIMIT_CORE, &rl);
 111
 112                         /* Just to be sure... */
 113                         assert_se(chdir("/") == 0);
 114
 115                         /* Raise the signal again */
 116                         raise(sig);
 117
 118                         assert_not_reached("We shouldn't be here...");
 119                         _exit(1);
 120
 121                 } else {
 122                         int status;
 123
 124                         /* Order things nicely. */
 125                         if (waitpid(pid, &status, 0) < 0)
 126                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(errno));
 127                         else if (!WCOREDUMP(status))
 128                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 129                         else
 130                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 131                 }
 132         }
 133
 134         if (arg_crash_chvt)
 135                 chvt(arg_crash_chvt);
 136
 137         if (arg_crash_shell) {
 138                 struct sigaction sa;
 139                 pid_t pid;
 140
 141                 log_info("Executing crash shell in 10s...");
 142                 sleep(10);
 143
 144                 /* Let the kernel reap children for us */
 145                 zero(sa);
 146                 sa.sa_handler = SIG_IGN;
 147                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 148                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 149
 150                 if ((pid = fork()) < 0)
 151                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 152                 else if (pid == 0) {
 153                         int fd, r;
 154
 155                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 156                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 157                         else if ((r = make_stdio(fd)) < 0)
 158                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 159
 160                         execl("/bin/sh", "/bin/sh", NULL);
 161
 162                         log_error("execl() failed: %s", strerror(errno));
 163                         _exit(1);
 164                 }
 165
 166                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 167         }
 168
 169         log_info("Freezing execution.");
 170         freeze();
 171 }
 172
 173 static void install_crash_handler(void) {
 174         struct sigaction sa;
 175
 176         zero(sa);
 177
 178         sa.sa_handler = crash;
 179         sa.sa_flags = SA_NODEFER;
 180
 181         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 182 }
 183
 184 static int make_null_stdio(void) {
 185         int null_fd, r;
 186
 187         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 188                 log_error("Failed to open /dev/null: %m");
 189                 return -errno;
 190         }
 191
 192         if ((r = make_stdio(null_fd)) < 0)
 193                 log_warning("Failed to dup2() device: %s", strerror(-r));
 194
 195         return r;
 196 }
 197
 198 static int console_setup(bool do_reset) {
 199         int tty_fd, r;
 200
 201         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 202          * and make sure we don't have a controlling tty. */
 203
 204         release_terminal();
 205
 206         if (!do_reset)
 207                 return 0;
 208
 209         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 210                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 211                 return -tty_fd;
 212         }
 213
 214         if ((r = reset_terminal(tty_fd)) < 0)
 215                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 216
 217         close_nointr_nofail(tty_fd);
 218         return r;
 219 }
 220
 221 static int set_default_unit(const char *u) {
 222         char *c;
 223
 224         assert(u);
 225
 226         if (!(c = strdup(u)))
 227                 return -ENOMEM;
 228
 229         free(arg_default_unit);
 230         arg_default_unit = c;
 231         return 0;
 232 }
 233
 234 static int parse_proc_cmdline_word(const char *word) {
 235
 236         static const char * const rlmap[] = {
 237                 "single", SPECIAL_RESCUE_TARGET,
 238                 "-s",     SPECIAL_RESCUE_TARGET,
 239                 "s",      SPECIAL_RESCUE_TARGET,
 240                 "S",      SPECIAL_RESCUE_TARGET,
 241                 "1",      SPECIAL_RESCUE_TARGET,
 242                 "2",      SPECIAL_RUNLEVEL2_TARGET,
 243                 "3",      SPECIAL_RUNLEVEL3_TARGET,
 244                 "4",      SPECIAL_RUNLEVEL4_TARGET,
 245                 "5",      SPECIAL_RUNLEVEL5_TARGET
 246         };
 247
 248         assert(word);
 249
 250         if (startswith(word, "systemd.unit="))
 251                 return set_default_unit(word + 13);
 252
 253         else if (startswith(word, "systemd.log_target=")) {
 254
 255                 if (log_set_target_from_string(word + 19) < 0)
 256                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 257
 258         } else if (startswith(word, "systemd.log_level=")) {
 259
 260                 if (log_set_max_level_from_string(word + 18) < 0)
 261                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 262
 263         } else if (startswith(word, "systemd.log_color=")) {
 264
 265                 if (log_show_color_from_string(word + 18) < 0)
 266                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 267
 268         } else if (startswith(word, "systemd.log_location=")) {
 269
 270                 if (log_show_location_from_string(word + 21) < 0)
 271                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 272
 273         } else if (startswith(word, "systemd.dump_core=")) {
 274                 int r;
 275
 276                 if ((r = parse_boolean(word + 18)) < 0)
 277                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 278                 else
 279                         arg_dump_core = r;
 280
 281         } else if (startswith(word, "systemd.crash_shell=")) {
 282                 int r;
 283
 284                 if ((r = parse_boolean(word + 20)) < 0)
 285                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 286                 else
 287                         arg_crash_shell = r;
 288
 289         } else if (startswith(word, "systemd.confirm_spawn=")) {
 290                 int r;
 291
 292                 if ((r = parse_boolean(word + 22)) < 0)
 293                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 294                 else
 295                         arg_confirm_spawn = r;
 296
 297         } else if (startswith(word, "systemd.crash_chvt=")) {
 298                 int k;
 299
 300                 if (safe_atoi(word + 19, &k) < 0)
 301                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 302                 else
 303                         arg_crash_chvt = k;
 304
 305         } else if (startswith(word, "systemd.show_status=")) {
 306                 int r;
 307
 308                 if ((r = parse_boolean(word + 20)) < 0)
 309                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 310                 else
 311                         arg_show_status = r;
 312
 313         } else if (startswith(word, "systemd.sysv_console=")) {
 314                 int r;
 315
 316                 if ((r = parse_boolean(word + 21)) < 0)
 317                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 318                 else
 319                         arg_sysv_console = r;
 320
 321         } else if (startswith(word, "systemd.")) {
 322
 323                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 324
 325                 log_info("Supported kernel switches:\n"
 326                          "systemd.unit=UNIT                        Default unit to start\n"
 327                          "systemd.dump_core=0|1                    Dump core on crash\n"
 328                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 329                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 330                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 331                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 332                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 333                          "systemd.log_target=console|kmsg|syslog|syslog-org-kmsg|null\n"
 334                          "                                         Log target\n"
 335                          "systemd.log_level=LEVEL                  Log level\n"
 336                          "systemd.log_color=0|1                    Highlight important log messages\n"
 337                          "systemd.log_location=0|1                 Include code location in log messages\n");
 338
 339         } else if (startswith(word, "console=")) {
 340                 const char *k;
 341                 size_t l;
 342                 char *w = NULL;
 343
 344                 k = word + 8;
 345                 l = strcspn(k, ",");
 346
 347                 /* Ignore the console setting if set to a VT */
 348                 if (l < 4 ||
 349                     !startswith(k, "tty") ||
 350                     k[3+strspn(k+3, "0123456789")] != 0) {
 351
 352                         if (!(w = strndup(k, l)))
 353                                 return -ENOMEM;
 354                 }
 355
 356                 free(arg_console);
 357                 arg_console = w;
 358
 359         } else if (streq(word, "quiet")) {
 360                 arg_show_status = false;
 361                 arg_sysv_console = false;
 362         } else {
 363                 unsigned i;
 364
 365                 /* SysV compatibility */
 366                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 367                         if (streq(word, rlmap[i]))
 368                                 return set_default_unit(rlmap[i+1]);
 369         }
 370
 371         return 0;
 372 }
 373
 374 static int config_parse_level(
 375                 const char *filename,
 376                 unsigned line,
 377                 const char *section,
 378                 const char *lvalue,
 379                 const char *rvalue,
 380                 void *data,
 381                 void *userdata) {
 382
 383         assert(filename);
 384         assert(lvalue);
 385         assert(rvalue);
 386
 387         log_set_max_level_from_string(rvalue);
 388         return 0;
 389 }
 390
 391 static int config_parse_target(
 392                 const char *filename,
 393                 unsigned line,
 394                 const char *section,
 395                 const char *lvalue,
 396                 const char *rvalue,
 397                 void *data,
 398                 void *userdata) {
 399
 400         assert(filename);
 401         assert(lvalue);
 402         assert(rvalue);
 403
 404         log_set_target_from_string(rvalue);
 405         return 0;
 406 }
 407
 408 static int config_parse_color(
 409                 const char *filename,
 410                 unsigned line,
 411                 const char *section,
 412                 const char *lvalue,
 413                 const char *rvalue,
 414                 void *data,
 415                 void *userdata) {
 416
 417         assert(filename);
 418         assert(lvalue);
 419         assert(rvalue);
 420
 421         log_show_color_from_string(rvalue);
 422         return 0;
 423 }
 424
 425 static int config_parse_location(
 426                 const char *filename,
 427                 unsigned line,
 428                 const char *section,
 429                 const char *lvalue,
 430                 const char *rvalue,
 431                 void *data,
 432                 void *userdata) {
 433
 434         assert(filename);
 435         assert(lvalue);
 436         assert(rvalue);
 437
 438         log_show_location_from_string(rvalue);
 439         return 0;
 440 }
 441
 442 static int config_parse_cpu_affinity(
 443                 const char *filename,
 444                 unsigned line,
 445                 const char *section,
 446                 const char *lvalue,
 447                 const char *rvalue,
 448                 void *data,
 449                 void *userdata) {
 450
 451         char *w;
 452         size_t l;
 453         char *state;
 454         cpu_set_t *c = NULL;
 455         unsigned ncpus = 0;
 456
 457         assert(filename);
 458         assert(lvalue);
 459         assert(rvalue);
 460
 461         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 462                 char *t;
 463                 int r;
 464                 unsigned cpu;
 465
 466                 if (!(t = strndup(w, l)))
 467                         return -ENOMEM;
 468
 469                 r = safe_atou(t, &cpu);
 470                 free(t);
 471
 472                 if (!c)
 473                         if (!(c = cpu_set_malloc(&ncpus)))
 474                                 return -ENOMEM;
 475
 476                 if (r < 0 || cpu >= ncpus) {
 477                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 478                         CPU_FREE(c);
 479                         return -EBADMSG;
 480                 }
 481
 482                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 483         }
 484
 485         if (c) {
 486                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 487                         log_warning("Failed to set CPU affinity: %m");
 488
 489                 CPU_FREE(c);
 490         }
 491
 492         return 0;
 493 }
 494
 495 static int parse_config_file(void) {
 496
 497         const ConfigItem items[] = {
 498                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 499                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 500                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 501                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 502                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 503                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 504                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 505                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 506                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 507                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 508                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 509                 { "SwapAuto",    config_parse_bool,         &arg_swap_auto,     "Manager" },
 510                 { NULL, NULL, NULL, NULL }
 511         };
 512
 513         static const char * const sections[] = {
 514                 "Manager",
 515                 NULL
 516         };
 517
 518         FILE *f;
 519         const char *fn;
 520         int r;
 521
 522         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 523
 524         if (!(f = fopen(fn, "re"))) {
 525                 if (errno == ENOENT)
 526                         return 0;
 527
 528                 log_warning("Failed to open configuration file '%s': %m", fn);
 529                 return 0;
 530         }
 531
 532         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 533                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 534
 535         fclose(f);
 536
 537         return 0;
 538 }
 539
 540 static int parse_proc_cmdline(void) {
 541         char *line;
 542         int r;
 543         char *w;
 544         size_t l;
 545         char *state;
 546
 547         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 548                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 549                 return 0;
 550         }
 551
 552         FOREACH_WORD_QUOTED(w, l, line, state) {
 553                 char *word;
 554
 555                 if (!(word = strndup(w, l))) {
 556                         r = -ENOMEM;
 557                         goto finish;
 558                 }
 559
 560                 r = parse_proc_cmdline_word(word);
 561                 free(word);
 562
 563                 if (r < 0)
 564                         goto finish;
 565         }
 566
 567         r = 0;
 568
 569 finish:
 570         free(line);
 571         return r;
 572 }
 573
 574 static int parse_argv(int argc, char *argv[]) {
 575
 576         enum {
 577                 ARG_LOG_LEVEL = 0x100,
 578                 ARG_LOG_TARGET,
 579                 ARG_LOG_COLOR,
 580                 ARG_LOG_LOCATION,
 581                 ARG_UNIT,
 582                 ARG_SYSTEM,
 583                 ARG_SESSION,
 584                 ARG_TEST,
 585                 ARG_DUMP_CONFIGURATION_ITEMS,
 586                 ARG_DUMP_CORE,
 587                 ARG_CRASH_SHELL,
 588                 ARG_CONFIRM_SPAWN,
 589                 ARG_SHOW_STATUS,
 590                 ARG_SYSV_CONSOLE,
 591                 ARG_DESERIALIZE,
 592                 ARG_INTROSPECT
 593         };
 594
 595         static const struct option options[] = {
 596                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 597                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 598                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 599                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 600                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 601                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 602                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 603                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 604                 { "help",                     no_argument,       NULL, 'h'                          },
 605                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 606                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 607                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 608                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 609                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 610                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 611                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 612                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 613                 { NULL,                       0,                 NULL, 0                            }
 614         };
 615
 616         int c, r;
 617
 618         assert(argc >= 1);
 619         assert(argv);
 620
 621         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 622
 623                 switch (c) {
 624
 625                 case ARG_LOG_LEVEL:
 626                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 627                                 log_error("Failed to parse log level %s.", optarg);
 628                                 return r;
 629                         }
 630
 631                         break;
 632
 633                 case ARG_LOG_TARGET:
 634
 635                         if ((r = log_set_target_from_string(optarg)) < 0) {
 636                                 log_error("Failed to parse log target %s.", optarg);
 637                                 return r;
 638                         }
 639
 640                         break;
 641
 642                 case ARG_LOG_COLOR:
 643
 644                         if (optarg) {
 645                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 646                                         log_error("Failed to parse log color setting %s.", optarg);
 647                                         return r;
 648                                 }
 649                         } else
 650                                 log_show_color(true);
 651
 652                         break;
 653
 654                 case ARG_LOG_LOCATION:
 655
 656                         if (optarg) {
 657                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 658                                         log_error("Failed to parse log location setting %s.", optarg);
 659                                         return r;
 660                                 }
 661                         } else
 662                                 log_show_location(true);
 663
 664                         break;
 665
 666                 case ARG_UNIT:
 667
 668                         if ((r = set_default_unit(optarg)) < 0) {
 669                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 670                                 return r;
 671                         }
 672
 673                         break;
 674
 675                 case ARG_SYSTEM:
 676                         arg_running_as = MANAGER_SYSTEM;
 677                         break;
 678
 679                 case ARG_SESSION:
 680                         arg_running_as = MANAGER_SESSION;
 681                         break;
 682
 683                 case ARG_TEST:
 684                         arg_action = ACTION_TEST;
 685                         break;
 686
 687                 case ARG_DUMP_CONFIGURATION_ITEMS:
 688                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 689                         break;
 690
 691                 case ARG_DUMP_CORE:
 692                         arg_dump_core = true;
 693                         break;
 694
 695                 case ARG_CRASH_SHELL:
 696                         arg_crash_shell = true;
 697                         break;
 698
 699                 case ARG_CONFIRM_SPAWN:
 700                         arg_confirm_spawn = true;
 701                         break;
 702
 703                 case ARG_SHOW_STATUS:
 704
 705                         if (optarg) {
 706                                 if ((r = parse_boolean(optarg)) < 0) {
 707                                         log_error("Failed to show status boolean %s.", optarg);
 708                                         return r;
 709                                 }
 710                                 arg_show_status = r;
 711                         } else
 712                                 arg_show_status = true;
 713                         break;
 714
 715                 case ARG_SYSV_CONSOLE:
 716
 717                         if (optarg) {
 718                                 if ((r = parse_boolean(optarg)) < 0) {
 719                                         log_error("Failed to SysV console boolean %s.", optarg);
 720                                         return r;
 721                                 }
 722                                 arg_sysv_console = r;
 723                         } else
 724                                 arg_sysv_console = true;
 725                         break;
 726
 727                 case ARG_DESERIALIZE: {
 728                         int fd;
 729                         FILE *f;
 730
 731                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 732                                 log_error("Failed to parse deserialize option %s.", optarg);
 733                                 return r;
 734                         }
 735
 736                         if (!(f = fdopen(fd, "r"))) {
 737                                 log_error("Failed to open serialization fd: %m");
 738                                 return r;
 739                         }
 740
 741                         if (serialization)
 742                                 fclose(serialization);
 743
 744                         serialization = f;
 745
 746                         break;
 747                 }
 748
 749                 case ARG_INTROSPECT: {
 750                         const char * const * i = NULL;
 751
 752                         for (i = bus_interface_table; *i; i += 2)
 753                                 if (!optarg || streq(i[0], optarg)) {
 754                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 755                                               "<node>\n", stdout);
 756                                         fputs(i[1], stdout);
 757                                         fputs("</node>\n", stdout);
 758
 759                                         if (optarg)
 760                                                 break;
 761                                 }
 762
 763                         if (!i[0] && optarg)
 764                                 log_error("Unknown interface %s.", optarg);
 765
 766                         arg_action = ACTION_DONE;
 767                         break;
 768                 }
 769
 770                 case 'h':
 771                         arg_action = ACTION_HELP;
 772                         break;
 773
 774                 case 'D':
 775                         log_set_max_level(LOG_DEBUG);
 776                         break;
 777
 778                 case '?':
 779                         return -EINVAL;
 780
 781                 default:
 782                         log_error("Unknown option code %c", c);
 783                         return -EINVAL;
 784                 }
 785
 786         /* PID 1 will get the kernel arguments as parameters, which we
 787          * ignore and unconditionally read from
 788          * /proc/cmdline. However, we need to ignore those arguments
 789          * here. */
 790         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 791                 log_error("Excess arguments.");
 792                 return -EINVAL;
 793         }
 794
 795         return 0;
 796 }
 797
 798 static int help(void) {
 799
 800         printf("%s [OPTIONS...]\n\n"
 801                "Starts up and maintains the system or a session.\n\n"
 802                "  -h --help                      Show this help\n"
 803                "     --test                      Determine startup sequence, dump it and exit\n"
 804                "     --dump-configuration-items  Dump understood unit configuration items\n"
 805                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 806                "     --unit=UNIT                 Set default unit\n"
 807                "     --system                    Run a system instance, even if PID != 1\n"
 808                "     --session                   Run a session instance\n"
 809                "     --dump-core                 Dump core on crash\n"
 810                "     --crash-shell               Run shell on crash\n"
 811                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 812                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 813                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 814                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 815                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 816                "     --log-color[=0|1]           Highlight important log messages\n"
 817                "     --log-location[=0|1]        Include code location in log messages\n",
 818                program_invocation_short_name);
 819
 820         return 0;
 821 }
 822
 823 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 824         FILE *f = NULL;
 825         FDSet *fds = NULL;
 826         int r;
 827
 828         assert(m);
 829         assert(_f);
 830         assert(_fds);
 831
 832         if ((r = manager_open_serialization(m, &f)) < 0) {
 833                 log_error("Failed to create serialization faile: %s", strerror(-r));
 834                 goto fail;
 835         }
 836
 837         if (!(fds = fdset_new())) {
 838                 r = -ENOMEM;
 839                 log_error("Failed to allocate fd set: %s", strerror(-r));
 840                 goto fail;
 841         }
 842
 843         if ((r = manager_serialize(m, f, fds)) < 0) {
 844                 log_error("Failed to serialize state: %s", strerror(-r));
 845                 goto fail;
 846         }
 847
 848         if (fseeko(f, 0, SEEK_SET) < 0) {
 849                 log_error("Failed to rewind serialization fd: %m");
 850                 goto fail;
 851         }
 852
 853         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 854                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 855                 goto fail;
 856         }
 857
 858         if ((r = fdset_cloexec(fds, false)) < 0) {
 859                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 860                 goto fail;
 861         }
 862
 863         *_f = f;
 864         *_fds = fds;
 865
 866         return 0;
 867
 868 fail:
 869         fdset_free(fds);
 870
 871         if (f)
 872                 fclose(f);
 873
 874         return r;
 875 }
 876
 877 int main(int argc, char *argv[]) {
 878         Manager *m = NULL;
 879         int r, retval = EXIT_FAILURE;
 880         FDSet *fds = NULL;
 881         bool reexecute = false;
 882
 883         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 884                 /* This is compatbility support for SysV, where
 885                  * calling init as a user is identical to telinit. */
 886
 887                 errno = -ENOENT;
 888                 execv(SYSTEMCTL_BINARY_PATH, argv);
 889                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 890                 return 1;
 891         }
 892
 893         log_show_color(isatty(STDERR_FILENO) > 0);
 894         log_show_location(false);
 895         log_set_max_level(LOG_INFO);
 896
 897         if (getpid() == 1) {
 898                 arg_running_as = MANAGER_SYSTEM;
 899                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 900
 901                 if (label_init() < 0)
 902                         goto finish;
 903         } else {
 904                 arg_running_as = MANAGER_SESSION;
 905                 log_set_target(LOG_TARGET_CONSOLE);
 906         }
 907
 908         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 909                 goto finish;
 910
 911         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 912          * /proc/$PID/fd is available. */
 913         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 914                 if (mount_setup() < 0)
 915                         goto finish;
 916
 917         /* Reset all signal handlers. */
 918         assert_se(reset_all_signal_handlers() == 0);
 919
 920         /* If we are init, we can block sigkill. Yay. */
 921         ignore_signals(SIGNALS_IGNORE, -1);
 922
 923         if (parse_config_file() < 0)
 924                 goto finish;
 925
 926         if (arg_running_as == MANAGER_SYSTEM)
 927                 if (parse_proc_cmdline() < 0)
 928                         goto finish;
 929
 930         log_parse_environment();
 931
 932         if (parse_argv(argc, argv) < 0)
 933                 goto finish;
 934
 935         if (arg_action == ACTION_HELP) {
 936                 retval = help();
 937                 goto finish;
 938         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 939                 unit_dump_config_items(stdout);
 940                 retval = EXIT_SUCCESS;
 941                 goto finish;
 942         } else if (arg_action == ACTION_DONE) {
 943                 retval = EXIT_SUCCESS;
 944                 goto finish;
 945         }
 946
 947         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 948
 949         /* Remember open file descriptors for later deserialization */
 950         if (serialization) {
 951                 if ((r = fdset_new_fill(&fds)) < 0) {
 952                         log_error("Failed to allocate fd set: %s", strerror(-r));
 953                         goto finish;
 954                 }
 955
 956                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 957         } else
 958                 close_all_fds(NULL, 0);
 959
 960         /* Set up PATH unless it is already set */
 961         setenv("PATH",
 962                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 963                arg_running_as == MANAGER_SYSTEM);
 964
 965         /* Move out of the way, so that we won't block unmounts */
 966         assert_se(chdir("/")  == 0);
 967
 968         if (arg_running_as == MANAGER_SYSTEM) {
 969                 /* Become a session leader if we aren't one yet. */
 970                 setsid();
 971
 972                 /* Disable the umask logic */
 973                 umask(0);
 974         }
 975
 976         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 977         dbus_connection_set_change_sigpipe(FALSE);
 978
 979         /* Reset the console, but only if this is really init and we
 980          * are freshly booted */
 981         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 982                 console_setup(getpid() == 1 && !serialization);
 983                 make_null_stdio();
 984         }
 985
 986         /* Open the logging devices, if possible and necessary */
 987         log_open();
 988
 989         /* Make sure we leave a core dump without panicing the
 990          * kernel. */
 991         if (getpid() == 1)
 992                 install_crash_handler();
 993
 994         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
 995                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES ")", manager_running_as_to_string(arg_running_as));
 996
 997         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
 998                 if (arg_show_status)
 999                         status_welcome();
1000
1001                 kmod_setup();
1002                 hostname_setup();
1003                 loopback_setup();
1004         }
1005
1006         if ((r = manager_new(arg_running_as, &m)) < 0) {
1007                 log_error("Failed to allocate manager object: %s", strerror(-r));
1008                 goto finish;
1009         }
1010
1011         m->confirm_spawn = arg_confirm_spawn;
1012         m->show_status = arg_show_status;
1013         m->sysv_console = arg_sysv_console;
1014         m->mount_auto = arg_mount_auto;
1015         m->swap_auto = arg_swap_auto;
1016
1017         if (arg_console)
1018                 manager_set_console(m, arg_console);
1019
1020         if ((r = manager_startup(m, serialization, fds)) < 0)
1021                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1022
1023         if (fds) {
1024                 /* This will close all file descriptors that were opened, but
1025                  * not claimed by any unit. */
1026
1027                 fdset_free(fds);
1028                 fds = NULL;
1029         }
1030
1031         if (serialization) {
1032                 fclose(serialization);
1033                 serialization = NULL;
1034         } else {
1035                 DBusError error;
1036                 Unit *target = NULL;
1037
1038                 dbus_error_init(&error);
1039
1040                 log_debug("Activating default unit: %s", arg_default_unit);
1041
1042                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1043                         log_error("Failed to load default target: %s", bus_error(&error, r));
1044                         dbus_error_free(&error);
1045                 } else if (target->meta.load_state != UNIT_LOADED)
1046                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1047
1048                 if (!target || target->meta.load_state != UNIT_LOADED) {
1049                         log_info("Trying to load rescue target...");
1050
1051                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1052                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1053                                 dbus_error_free(&error);
1054                                 goto finish;
1055                         } else if (target->meta.load_state != UNIT_LOADED) {
1056                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1057                                 goto finish;
1058                         }
1059                 }
1060
1061                 if (arg_action == ACTION_TEST) {
1062                         printf("-> By units:\n");
1063                         manager_dump_units(m, stdout, "\t");
1064                 }
1065
1066                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1067                         log_error("Failed to start default target: %s", bus_error(&error, r));
1068                         dbus_error_free(&error);
1069                         goto finish;
1070                 }
1071
1072                 if (arg_action == ACTION_TEST) {
1073                         printf("-> By jobs:\n");
1074                         manager_dump_jobs(m, stdout, "\t");
1075                         retval = EXIT_SUCCESS;
1076                         goto finish;
1077                 }
1078         }
1079
1080         for (;;) {
1081                 if ((r = manager_loop(m)) < 0) {
1082                         log_error("Failed to run mainloop: %s", strerror(-r));
1083                         goto finish;
1084                 }
1085
1086                 switch (m->exit_code) {
1087
1088                 case MANAGER_EXIT:
1089                         retval = EXIT_SUCCESS;
1090                         log_debug("Exit.");
1091                         goto finish;
1092
1093                 case MANAGER_RELOAD:
1094                         log_info("Reloading.");
1095                         if ((r = manager_reload(m)) < 0)
1096                                 log_error("Failed to reload: %s", strerror(-r));
1097                         break;
1098
1099                 case MANAGER_REEXECUTE:
1100                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1101                                 goto finish;
1102
1103                         reexecute = true;
1104                         log_notice("Reexecuting.");
1105                         goto finish;
1106
1107                 default:
1108                         assert_not_reached("Unknown exit code.");
1109                 }
1110         }
1111
1112 finish:
1113         if (m)
1114                 manager_free(m);
1115
1116         free(arg_default_unit);
1117         free(arg_console);
1118
1119         dbus_shutdown();
1120
1121         label_finish();
1122
1123         if (reexecute) {
1124                 const char *args[15];
1125                 unsigned i = 0;
1126                 char sfd[16];
1127
1128                 assert(serialization);
1129                 assert(fds);
1130
1131                 args[i++] = SYSTEMD_BINARY_PATH;
1132
1133                 args[i++] = "--log-level";
1134                 args[i++] = log_level_to_string(log_get_max_level());
1135
1136                 args[i++] = "--log-target";
1137                 args[i++] = log_target_to_string(log_get_target());
1138
1139                 if (arg_running_as == MANAGER_SYSTEM)
1140                         args[i++] = "--system";
1141                 else
1142                         args[i++] = "--session";
1143
1144                 if (arg_dump_core)
1145                         args[i++] = "--dump-core";
1146
1147                 if (arg_crash_shell)
1148                         args[i++] = "--crash-shell";
1149
1150                 if (arg_confirm_spawn)
1151                         args[i++] = "--confirm-spawn";
1152
1153                 if (arg_show_status)
1154                         args[i++] = "--show-status=1";
1155                 else
1156                         args[i++] = "--show-status=0";
1157
1158                 if (arg_sysv_console)
1159                         args[i++] = "--sysv-console=1";
1160                 else
1161                         args[i++] = "--sysv-console=0";
1162
1163                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1164                 char_array_0(sfd);
1165
1166                 args[i++] = "--deserialize";
1167                 args[i++] = sfd;
1168
1169                 args[i++] = NULL;
1170
1171                 assert(i <= ELEMENTSOF(args));
1172
1173                 execv(args[0], (char* const*) args);
1174
1175                 log_error("Failed to reexecute: %m");
1176         }
1177
1178         if (serialization)
1179                 fclose(serialization);
1180
1181         if (fds)
1182                 fdset_free(fds);
1183
1184         if (getpid() == 1)
1185                 freeze();
1186
1187         return retval;
1188 }