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                         siginfo_t status;
 123                         int r;
 124
 125                         /* Order things nicely. */
 126                         if ((r = wait_for_terminate(pid, &status)) < 0)
 127                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
 128                         else if (status.si_code != CLD_DUMPED)
 129                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 130                         else
 131                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 132                 }
 133         }
 134
 135         if (arg_crash_chvt)
 136                 chvt(arg_crash_chvt);
 137
 138         if (arg_crash_shell) {
 139                 struct sigaction sa;
 140                 pid_t pid;
 141
 142                 log_info("Executing crash shell in 10s...");
 143                 sleep(10);
 144
 145                 /* Let the kernel reap children for us */
 146                 zero(sa);
 147                 sa.sa_handler = SIG_IGN;
 148                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 149                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 150
 151                 if ((pid = fork()) < 0)
 152                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 153                 else if (pid == 0) {
 154                         int fd, r;
 155
 156                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 157                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 158                         else if ((r = make_stdio(fd)) < 0)
 159                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 160
 161                         execl("/bin/sh", "/bin/sh", NULL);
 162
 163                         log_error("execl() failed: %s", strerror(errno));
 164                         _exit(1);
 165                 }
 166
 167                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 168         }
 169
 170         log_info("Freezing execution.");
 171         freeze();
 172 }
 173
 174 static void install_crash_handler(void) {
 175         struct sigaction sa;
 176
 177         zero(sa);
 178
 179         sa.sa_handler = crash;
 180         sa.sa_flags = SA_NODEFER;
 181
 182         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 183 }
 184
 185 static int make_null_stdio(void) {
 186         int null_fd, r;
 187
 188         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 189                 log_error("Failed to open /dev/null: %m");
 190                 return -errno;
 191         }
 192
 193         if ((r = make_stdio(null_fd)) < 0)
 194                 log_warning("Failed to dup2() device: %s", strerror(-r));
 195
 196         return r;
 197 }
 198
 199 static int console_setup(bool do_reset) {
 200         int tty_fd, r;
 201
 202         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 203          * and make sure we don't have a controlling tty. */
 204
 205         release_terminal();
 206
 207         if (!do_reset)
 208                 return 0;
 209
 210         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 211                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 212                 return -tty_fd;
 213         }
 214
 215         if ((r = reset_terminal(tty_fd)) < 0)
 216                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 217
 218         close_nointr_nofail(tty_fd);
 219         return r;
 220 }
 221
 222 static int set_default_unit(const char *u) {
 223         char *c;
 224
 225         assert(u);
 226
 227         if (!(c = strdup(u)))
 228                 return -ENOMEM;
 229
 230         free(arg_default_unit);
 231         arg_default_unit = c;
 232         return 0;
 233 }
 234
 235 static int parse_proc_cmdline_word(const char *word) {
 236
 237         static const char * const rlmap[] = {
 238                 "emergency", SPECIAL_EMERGENCY_TARGET,
 239                 "single",    SPECIAL_RESCUE_TARGET,
 240                 "-s",        SPECIAL_RESCUE_TARGET,
 241                 "s",         SPECIAL_RESCUE_TARGET,
 242                 "S",         SPECIAL_RESCUE_TARGET,
 243                 "1",         SPECIAL_RESCUE_TARGET,
 244                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 245                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 246                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 247                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 248         };
 249
 250         assert(word);
 251
 252         if (startswith(word, "systemd.unit="))
 253                 return set_default_unit(word + 13);
 254
 255         else if (startswith(word, "systemd.log_target=")) {
 256
 257                 if (log_set_target_from_string(word + 19) < 0)
 258                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 259
 260         } else if (startswith(word, "systemd.log_level=")) {
 261
 262                 if (log_set_max_level_from_string(word + 18) < 0)
 263                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 264
 265         } else if (startswith(word, "systemd.log_color=")) {
 266
 267                 if (log_show_color_from_string(word + 18) < 0)
 268                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 269
 270         } else if (startswith(word, "systemd.log_location=")) {
 271
 272                 if (log_show_location_from_string(word + 21) < 0)
 273                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 274
 275         } else if (startswith(word, "systemd.dump_core=")) {
 276                 int r;
 277
 278                 if ((r = parse_boolean(word + 18)) < 0)
 279                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 280                 else
 281                         arg_dump_core = r;
 282
 283         } else if (startswith(word, "systemd.crash_shell=")) {
 284                 int r;
 285
 286                 if ((r = parse_boolean(word + 20)) < 0)
 287                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 288                 else
 289                         arg_crash_shell = r;
 290
 291         } else if (startswith(word, "systemd.confirm_spawn=")) {
 292                 int r;
 293
 294                 if ((r = parse_boolean(word + 22)) < 0)
 295                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 296                 else
 297                         arg_confirm_spawn = r;
 298
 299         } else if (startswith(word, "systemd.crash_chvt=")) {
 300                 int k;
 301
 302                 if (safe_atoi(word + 19, &k) < 0)
 303                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 304                 else
 305                         arg_crash_chvt = k;
 306
 307         } else if (startswith(word, "systemd.show_status=")) {
 308                 int r;
 309
 310                 if ((r = parse_boolean(word + 20)) < 0)
 311                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 312                 else
 313                         arg_show_status = r;
 314
 315         } else if (startswith(word, "systemd.sysv_console=")) {
 316                 int r;
 317
 318                 if ((r = parse_boolean(word + 21)) < 0)
 319                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 320                 else
 321                         arg_sysv_console = r;
 322
 323         } else if (startswith(word, "systemd.")) {
 324
 325                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 326
 327                 log_info("Supported kernel switches:\n"
 328                          "systemd.unit=UNIT                        Default unit to start\n"
 329                          "systemd.dump_core=0|1                    Dump core on crash\n"
 330                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 331                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 332                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 333                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 334                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 335                          "systemd.log_target=console|kmsg|syslog|syslog-org-kmsg|null\n"
 336                          "                                         Log target\n"
 337                          "systemd.log_level=LEVEL                  Log level\n"
 338                          "systemd.log_color=0|1                    Highlight important log messages\n"
 339                          "systemd.log_location=0|1                 Include code location in log messages\n");
 340
 341         } else if (startswith(word, "console=")) {
 342                 const char *k;
 343                 size_t l;
 344                 char *w = NULL;
 345
 346                 k = word + 8;
 347                 l = strcspn(k, ",");
 348
 349                 /* Ignore the console setting if set to a VT */
 350                 if (l < 4 ||
 351                     !startswith(k, "tty") ||
 352                     k[3+strspn(k+3, "0123456789")] != 0) {
 353
 354                         if (!(w = strndup(k, l)))
 355                                 return -ENOMEM;
 356                 }
 357
 358                 free(arg_console);
 359                 arg_console = w;
 360
 361         } else if (streq(word, "quiet")) {
 362                 arg_show_status = false;
 363                 arg_sysv_console = false;
 364         } else {
 365                 unsigned i;
 366
 367                 /* SysV compatibility */
 368                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 369                         if (streq(word, rlmap[i]))
 370                                 return set_default_unit(rlmap[i+1]);
 371         }
 372
 373         return 0;
 374 }
 375
 376 static int config_parse_level(
 377                 const char *filename,
 378                 unsigned line,
 379                 const char *section,
 380                 const char *lvalue,
 381                 const char *rvalue,
 382                 void *data,
 383                 void *userdata) {
 384
 385         assert(filename);
 386         assert(lvalue);
 387         assert(rvalue);
 388
 389         log_set_max_level_from_string(rvalue);
 390         return 0;
 391 }
 392
 393 static int config_parse_target(
 394                 const char *filename,
 395                 unsigned line,
 396                 const char *section,
 397                 const char *lvalue,
 398                 const char *rvalue,
 399                 void *data,
 400                 void *userdata) {
 401
 402         assert(filename);
 403         assert(lvalue);
 404         assert(rvalue);
 405
 406         log_set_target_from_string(rvalue);
 407         return 0;
 408 }
 409
 410 static int config_parse_color(
 411                 const char *filename,
 412                 unsigned line,
 413                 const char *section,
 414                 const char *lvalue,
 415                 const char *rvalue,
 416                 void *data,
 417                 void *userdata) {
 418
 419         assert(filename);
 420         assert(lvalue);
 421         assert(rvalue);
 422
 423         log_show_color_from_string(rvalue);
 424         return 0;
 425 }
 426
 427 static int config_parse_location(
 428                 const char *filename,
 429                 unsigned line,
 430                 const char *section,
 431                 const char *lvalue,
 432                 const char *rvalue,
 433                 void *data,
 434                 void *userdata) {
 435
 436         assert(filename);
 437         assert(lvalue);
 438         assert(rvalue);
 439
 440         log_show_location_from_string(rvalue);
 441         return 0;
 442 }
 443
 444 static int config_parse_cpu_affinity(
 445                 const char *filename,
 446                 unsigned line,
 447                 const char *section,
 448                 const char *lvalue,
 449                 const char *rvalue,
 450                 void *data,
 451                 void *userdata) {
 452
 453         char *w;
 454         size_t l;
 455         char *state;
 456         cpu_set_t *c = NULL;
 457         unsigned ncpus = 0;
 458
 459         assert(filename);
 460         assert(lvalue);
 461         assert(rvalue);
 462
 463         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 464                 char *t;
 465                 int r;
 466                 unsigned cpu;
 467
 468                 if (!(t = strndup(w, l)))
 469                         return -ENOMEM;
 470
 471                 r = safe_atou(t, &cpu);
 472                 free(t);
 473
 474                 if (!c)
 475                         if (!(c = cpu_set_malloc(&ncpus)))
 476                                 return -ENOMEM;
 477
 478                 if (r < 0 || cpu >= ncpus) {
 479                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 480                         CPU_FREE(c);
 481                         return -EBADMSG;
 482                 }
 483
 484                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 485         }
 486
 487         if (c) {
 488                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 489                         log_warning("Failed to set CPU affinity: %m");
 490
 491                 CPU_FREE(c);
 492         }
 493
 494         return 0;
 495 }
 496
 497 static int parse_config_file(void) {
 498
 499         const ConfigItem items[] = {
 500                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 501                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 502                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 503                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 504                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 505                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 506                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 507                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 508                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 509                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 510                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 511                 { "SwapAuto",    config_parse_bool,         &arg_swap_auto,     "Manager" },
 512                 { NULL, NULL, NULL, NULL }
 513         };
 514
 515         static const char * const sections[] = {
 516                 "Manager",
 517                 NULL
 518         };
 519
 520         FILE *f;
 521         const char *fn;
 522         int r;
 523
 524         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 525
 526         if (!(f = fopen(fn, "re"))) {
 527                 if (errno == ENOENT)
 528                         return 0;
 529
 530                 log_warning("Failed to open configuration file '%s': %m", fn);
 531                 return 0;
 532         }
 533
 534         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 535                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 536
 537         fclose(f);
 538
 539         return 0;
 540 }
 541
 542 static int parse_proc_cmdline(void) {
 543         char *line;
 544         int r;
 545         char *w;
 546         size_t l;
 547         char *state;
 548
 549         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 550                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 551                 return 0;
 552         }
 553
 554         FOREACH_WORD_QUOTED(w, l, line, state) {
 555                 char *word;
 556
 557                 if (!(word = strndup(w, l))) {
 558                         r = -ENOMEM;
 559                         goto finish;
 560                 }
 561
 562                 r = parse_proc_cmdline_word(word);
 563                 free(word);
 564
 565                 if (r < 0)
 566                         goto finish;
 567         }
 568
 569         r = 0;
 570
 571 finish:
 572         free(line);
 573         return r;
 574 }
 575
 576 static int parse_argv(int argc, char *argv[]) {
 577
 578         enum {
 579                 ARG_LOG_LEVEL = 0x100,
 580                 ARG_LOG_TARGET,
 581                 ARG_LOG_COLOR,
 582                 ARG_LOG_LOCATION,
 583                 ARG_UNIT,
 584                 ARG_SYSTEM,
 585                 ARG_SESSION,
 586                 ARG_TEST,
 587                 ARG_DUMP_CONFIGURATION_ITEMS,
 588                 ARG_DUMP_CORE,
 589                 ARG_CRASH_SHELL,
 590                 ARG_CONFIRM_SPAWN,
 591                 ARG_SHOW_STATUS,
 592                 ARG_SYSV_CONSOLE,
 593                 ARG_DESERIALIZE,
 594                 ARG_INTROSPECT
 595         };
 596
 597         static const struct option options[] = {
 598                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 599                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 600                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 601                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 602                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 603                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 604                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 605                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 606                 { "help",                     no_argument,       NULL, 'h'                          },
 607                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 608                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 609                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 610                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 611                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 612                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 613                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 614                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 615                 { NULL,                       0,                 NULL, 0                            }
 616         };
 617
 618         int c, r;
 619
 620         assert(argc >= 1);
 621         assert(argv);
 622
 623         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 624
 625                 switch (c) {
 626
 627                 case ARG_LOG_LEVEL:
 628                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 629                                 log_error("Failed to parse log level %s.", optarg);
 630                                 return r;
 631                         }
 632
 633                         break;
 634
 635                 case ARG_LOG_TARGET:
 636
 637                         if ((r = log_set_target_from_string(optarg)) < 0) {
 638                                 log_error("Failed to parse log target %s.", optarg);
 639                                 return r;
 640                         }
 641
 642                         break;
 643
 644                 case ARG_LOG_COLOR:
 645
 646                         if (optarg) {
 647                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 648                                         log_error("Failed to parse log color setting %s.", optarg);
 649                                         return r;
 650                                 }
 651                         } else
 652                                 log_show_color(true);
 653
 654                         break;
 655
 656                 case ARG_LOG_LOCATION:
 657
 658                         if (optarg) {
 659                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 660                                         log_error("Failed to parse log location setting %s.", optarg);
 661                                         return r;
 662                                 }
 663                         } else
 664                                 log_show_location(true);
 665
 666                         break;
 667
 668                 case ARG_UNIT:
 669
 670                         if ((r = set_default_unit(optarg)) < 0) {
 671                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 672                                 return r;
 673                         }
 674
 675                         break;
 676
 677                 case ARG_SYSTEM:
 678                         arg_running_as = MANAGER_SYSTEM;
 679                         break;
 680
 681                 case ARG_SESSION:
 682                         arg_running_as = MANAGER_SESSION;
 683                         break;
 684
 685                 case ARG_TEST:
 686                         arg_action = ACTION_TEST;
 687                         break;
 688
 689                 case ARG_DUMP_CONFIGURATION_ITEMS:
 690                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 691                         break;
 692
 693                 case ARG_DUMP_CORE:
 694                         arg_dump_core = true;
 695                         break;
 696
 697                 case ARG_CRASH_SHELL:
 698                         arg_crash_shell = true;
 699                         break;
 700
 701                 case ARG_CONFIRM_SPAWN:
 702                         arg_confirm_spawn = true;
 703                         break;
 704
 705                 case ARG_SHOW_STATUS:
 706
 707                         if (optarg) {
 708                                 if ((r = parse_boolean(optarg)) < 0) {
 709                                         log_error("Failed to show status boolean %s.", optarg);
 710                                         return r;
 711                                 }
 712                                 arg_show_status = r;
 713                         } else
 714                                 arg_show_status = true;
 715                         break;
 716
 717                 case ARG_SYSV_CONSOLE:
 718
 719                         if (optarg) {
 720                                 if ((r = parse_boolean(optarg)) < 0) {
 721                                         log_error("Failed to SysV console boolean %s.", optarg);
 722                                         return r;
 723                                 }
 724                                 arg_sysv_console = r;
 725                         } else
 726                                 arg_sysv_console = true;
 727                         break;
 728
 729                 case ARG_DESERIALIZE: {
 730                         int fd;
 731                         FILE *f;
 732
 733                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 734                                 log_error("Failed to parse deserialize option %s.", optarg);
 735                                 return r;
 736                         }
 737
 738                         if (!(f = fdopen(fd, "r"))) {
 739                                 log_error("Failed to open serialization fd: %m");
 740                                 return r;
 741                         }
 742
 743                         if (serialization)
 744                                 fclose(serialization);
 745
 746                         serialization = f;
 747
 748                         break;
 749                 }
 750
 751                 case ARG_INTROSPECT: {
 752                         const char * const * i = NULL;
 753
 754                         for (i = bus_interface_table; *i; i += 2)
 755                                 if (!optarg || streq(i[0], optarg)) {
 756                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 757                                               "<node>\n", stdout);
 758                                         fputs(i[1], stdout);
 759                                         fputs("</node>\n", stdout);
 760
 761                                         if (optarg)
 762                                                 break;
 763                                 }
 764
 765                         if (!i[0] && optarg)
 766                                 log_error("Unknown interface %s.", optarg);
 767
 768                         arg_action = ACTION_DONE;
 769                         break;
 770                 }
 771
 772                 case 'h':
 773                         arg_action = ACTION_HELP;
 774                         break;
 775
 776                 case 'D':
 777                         log_set_max_level(LOG_DEBUG);
 778                         break;
 779
 780                 case '?':
 781                         return -EINVAL;
 782
 783                 default:
 784                         log_error("Unknown option code %c", c);
 785                         return -EINVAL;
 786                 }
 787
 788         /* PID 1 will get the kernel arguments as parameters, which we
 789          * ignore and unconditionally read from
 790          * /proc/cmdline. However, we need to ignore those arguments
 791          * here. */
 792         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 793                 log_error("Excess arguments.");
 794                 return -EINVAL;
 795         }
 796
 797         return 0;
 798 }
 799
 800 static int help(void) {
 801
 802         printf("%s [OPTIONS...]\n\n"
 803                "Starts up and maintains the system or a session.\n\n"
 804                "  -h --help                      Show this help\n"
 805                "     --test                      Determine startup sequence, dump it and exit\n"
 806                "     --dump-configuration-items  Dump understood unit configuration items\n"
 807                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 808                "     --unit=UNIT                 Set default unit\n"
 809                "     --system                    Run a system instance, even if PID != 1\n"
 810                "     --session                   Run a session instance\n"
 811                "     --dump-core                 Dump core on crash\n"
 812                "     --crash-shell               Run shell on crash\n"
 813                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 814                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 815                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 816                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 817                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 818                "     --log-color[=0|1]           Highlight important log messages\n"
 819                "     --log-location[=0|1]        Include code location in log messages\n",
 820                program_invocation_short_name);
 821
 822         return 0;
 823 }
 824
 825 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 826         FILE *f = NULL;
 827         FDSet *fds = NULL;
 828         int r;
 829
 830         assert(m);
 831         assert(_f);
 832         assert(_fds);
 833
 834         if ((r = manager_open_serialization(m, &f)) < 0) {
 835                 log_error("Failed to create serialization faile: %s", strerror(-r));
 836                 goto fail;
 837         }
 838
 839         if (!(fds = fdset_new())) {
 840                 r = -ENOMEM;
 841                 log_error("Failed to allocate fd set: %s", strerror(-r));
 842                 goto fail;
 843         }
 844
 845         if ((r = manager_serialize(m, f, fds)) < 0) {
 846                 log_error("Failed to serialize state: %s", strerror(-r));
 847                 goto fail;
 848         }
 849
 850         if (fseeko(f, 0, SEEK_SET) < 0) {
 851                 log_error("Failed to rewind serialization fd: %m");
 852                 goto fail;
 853         }
 854
 855         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 856                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 857                 goto fail;
 858         }
 859
 860         if ((r = fdset_cloexec(fds, false)) < 0) {
 861                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 862                 goto fail;
 863         }
 864
 865         *_f = f;
 866         *_fds = fds;
 867
 868         return 0;
 869
 870 fail:
 871         fdset_free(fds);
 872
 873         if (f)
 874                 fclose(f);
 875
 876         return r;
 877 }
 878
 879 int main(int argc, char *argv[]) {
 880         Manager *m = NULL;
 881         int r, retval = EXIT_FAILURE;
 882         FDSet *fds = NULL;
 883         bool reexecute = false;
 884
 885         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 886                 /* This is compatbility support for SysV, where
 887                  * calling init as a user is identical to telinit. */
 888
 889                 errno = -ENOENT;
 890                 execv(SYSTEMCTL_BINARY_PATH, argv);
 891                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 892                 return 1;
 893         }
 894
 895         log_show_color(isatty(STDERR_FILENO) > 0);
 896         log_show_location(false);
 897         log_set_max_level(LOG_INFO);
 898
 899         if (getpid() == 1) {
 900                 arg_running_as = MANAGER_SYSTEM;
 901                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 902
 903                 if (label_init() < 0)
 904                         goto finish;
 905         } else {
 906                 arg_running_as = MANAGER_SESSION;
 907                 log_set_target(LOG_TARGET_CONSOLE);
 908         }
 909
 910         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 911                 goto finish;
 912
 913         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 914          * /proc/$PID/fd is available. */
 915         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 916                 if (mount_setup() < 0)
 917                         goto finish;
 918
 919         /* Reset all signal handlers. */
 920         assert_se(reset_all_signal_handlers() == 0);
 921
 922         /* If we are init, we can block sigkill. Yay. */
 923         ignore_signals(SIGNALS_IGNORE, -1);
 924
 925         if (parse_config_file() < 0)
 926                 goto finish;
 927
 928         if (arg_running_as == MANAGER_SYSTEM)
 929                 if (parse_proc_cmdline() < 0)
 930                         goto finish;
 931
 932         log_parse_environment();
 933
 934         if (parse_argv(argc, argv) < 0)
 935                 goto finish;
 936
 937         if (arg_action == ACTION_HELP) {
 938                 retval = help();
 939                 goto finish;
 940         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 941                 unit_dump_config_items(stdout);
 942                 retval = EXIT_SUCCESS;
 943                 goto finish;
 944         } else if (arg_action == ACTION_DONE) {
 945                 retval = EXIT_SUCCESS;
 946                 goto finish;
 947         }
 948
 949         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 950
 951         /* Remember open file descriptors for later deserialization */
 952         if (serialization) {
 953                 if ((r = fdset_new_fill(&fds)) < 0) {
 954                         log_error("Failed to allocate fd set: %s", strerror(-r));
 955                         goto finish;
 956                 }
 957
 958                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 959         } else
 960                 close_all_fds(NULL, 0);
 961
 962         /* Set up PATH unless it is already set */
 963         setenv("PATH",
 964                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 965                arg_running_as == MANAGER_SYSTEM);
 966
 967         /* Move out of the way, so that we won't block unmounts */
 968         assert_se(chdir("/")  == 0);
 969
 970         if (arg_running_as == MANAGER_SYSTEM) {
 971                 /* Become a session leader if we aren't one yet. */
 972                 setsid();
 973
 974                 /* Disable the umask logic */
 975                 umask(0);
 976         }
 977
 978         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 979         dbus_connection_set_change_sigpipe(FALSE);
 980
 981         /* Reset the console, but only if this is really init and we
 982          * are freshly booted */
 983         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 984                 console_setup(getpid() == 1 && !serialization);
 985                 make_null_stdio();
 986         }
 987
 988         /* Open the logging devices, if possible and necessary */
 989         log_open();
 990
 991         /* Make sure we leave a core dump without panicing the
 992          * kernel. */
 993         if (getpid() == 1)
 994                 install_crash_handler();
 995
 996         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
 997                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
 998
 999         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1000                 if (arg_show_status)
1001                         status_welcome();
1002
1003                 kmod_setup();
1004                 hostname_setup();
1005                 loopback_setup();
1006         }
1007
1008         if ((r = manager_new(arg_running_as, &m)) < 0) {
1009                 log_error("Failed to allocate manager object: %s", strerror(-r));
1010                 goto finish;
1011         }
1012
1013         m->confirm_spawn = arg_confirm_spawn;
1014         m->show_status = arg_show_status;
1015         m->sysv_console = arg_sysv_console;
1016         m->mount_auto = arg_mount_auto;
1017         m->swap_auto = arg_swap_auto;
1018
1019         if (arg_console)
1020                 manager_set_console(m, arg_console);
1021
1022         if ((r = manager_startup(m, serialization, fds)) < 0)
1023                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1024
1025         if (fds) {
1026                 /* This will close all file descriptors that were opened, but
1027                  * not claimed by any unit. */
1028
1029                 fdset_free(fds);
1030                 fds = NULL;
1031         }
1032
1033         if (serialization) {
1034                 fclose(serialization);
1035                 serialization = NULL;
1036         } else {
1037                 DBusError error;
1038                 Unit *target = NULL;
1039
1040                 dbus_error_init(&error);
1041
1042                 log_debug("Activating default unit: %s", arg_default_unit);
1043
1044                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1045                         log_error("Failed to load default target: %s", bus_error(&error, r));
1046                         dbus_error_free(&error);
1047                 } else if (target->meta.load_state != UNIT_LOADED)
1048                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1049
1050                 if (!target || target->meta.load_state != UNIT_LOADED) {
1051                         log_info("Trying to load rescue target...");
1052
1053                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1054                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1055                                 dbus_error_free(&error);
1056                                 goto finish;
1057                         } else if (target->meta.load_state != UNIT_LOADED) {
1058                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1059                                 goto finish;
1060                         }
1061                 }
1062
1063                 if (arg_action == ACTION_TEST) {
1064                         printf("-> By units:\n");
1065                         manager_dump_units(m, stdout, "\t");
1066                 }
1067
1068                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1069                         log_error("Failed to start default target: %s", bus_error(&error, r));
1070                         dbus_error_free(&error);
1071                         goto finish;
1072                 }
1073
1074                 if (arg_action == ACTION_TEST) {
1075                         printf("-> By jobs:\n");
1076                         manager_dump_jobs(m, stdout, "\t");
1077                         retval = EXIT_SUCCESS;
1078                         goto finish;
1079                 }
1080         }
1081
1082         for (;;) {
1083                 if ((r = manager_loop(m)) < 0) {
1084                         log_error("Failed to run mainloop: %s", strerror(-r));
1085                         goto finish;
1086                 }
1087
1088                 switch (m->exit_code) {
1089
1090                 case MANAGER_EXIT:
1091                         retval = EXIT_SUCCESS;
1092                         log_debug("Exit.");
1093                         goto finish;
1094
1095                 case MANAGER_RELOAD:
1096                         log_info("Reloading.");
1097                         if ((r = manager_reload(m)) < 0)
1098                                 log_error("Failed to reload: %s", strerror(-r));
1099                         break;
1100
1101                 case MANAGER_REEXECUTE:
1102                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1103                                 goto finish;
1104
1105                         reexecute = true;
1106                         log_notice("Reexecuting.");
1107                         goto finish;
1108
1109                 default:
1110                         assert_not_reached("Unknown exit code.");
1111                 }
1112         }
1113
1114 finish:
1115         if (m)
1116                 manager_free(m);
1117
1118         free(arg_default_unit);
1119         free(arg_console);
1120
1121         dbus_shutdown();
1122
1123         label_finish();
1124
1125         if (reexecute) {
1126                 const char *args[15];
1127                 unsigned i = 0;
1128                 char sfd[16];
1129
1130                 assert(serialization);
1131                 assert(fds);
1132
1133                 args[i++] = SYSTEMD_BINARY_PATH;
1134
1135                 args[i++] = "--log-level";
1136                 args[i++] = log_level_to_string(log_get_max_level());
1137
1138                 args[i++] = "--log-target";
1139                 args[i++] = log_target_to_string(log_get_target());
1140
1141                 if (arg_running_as == MANAGER_SYSTEM)
1142                         args[i++] = "--system";
1143                 else
1144                         args[i++] = "--session";
1145
1146                 if (arg_dump_core)
1147                         args[i++] = "--dump-core";
1148
1149                 if (arg_crash_shell)
1150                         args[i++] = "--crash-shell";
1151
1152                 if (arg_confirm_spawn)
1153                         args[i++] = "--confirm-spawn";
1154
1155                 if (arg_show_status)
1156                         args[i++] = "--show-status=1";
1157                 else
1158                         args[i++] = "--show-status=0";
1159
1160                 if (arg_sysv_console)
1161                         args[i++] = "--sysv-console=1";
1162                 else
1163                         args[i++] = "--sysv-console=0";
1164
1165                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1166                 char_array_0(sfd);
1167
1168                 args[i++] = "--deserialize";
1169                 args[i++] = sfd;
1170
1171                 args[i++] = NULL;
1172
1173                 assert(i <= ELEMENTSOF(args));
1174
1175                 execv(args[0], (char* const*) args);
1176
1177                 log_error("Failed to reexecute: %m");
1178         }
1179
1180         if (serialization)
1181                 fclose(serialization);
1182
1183         if (fds)
1184                 fdset_free(fds);
1185
1186         if (getpid() == 1)
1187                 freeze();
1188
1189         return retval;
1190 }