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_on_plug = true;
  68 static bool arg_swap_on_plug = true;
  69 static bool arg_mount_auto = true;
  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 (streq(word, "quiet")) {
 340                 arg_show_status = false;
 341                 arg_sysv_console = false;
 342         } else {
 343                 unsigned i;
 344
 345                 /* SysV compatibility */
 346                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 347                         if (streq(word, rlmap[i]))
 348                                 return set_default_unit(rlmap[i+1]);
 349         }
 350
 351         return 0;
 352 }
 353
 354 static int config_parse_level(
 355                 const char *filename,
 356                 unsigned line,
 357                 const char *section,
 358                 const char *lvalue,
 359                 const char *rvalue,
 360                 void *data,
 361                 void *userdata) {
 362
 363         assert(filename);
 364         assert(lvalue);
 365         assert(rvalue);
 366
 367         log_set_max_level_from_string(rvalue);
 368         return 0;
 369 }
 370
 371 static int config_parse_target(
 372                 const char *filename,
 373                 unsigned line,
 374                 const char *section,
 375                 const char *lvalue,
 376                 const char *rvalue,
 377                 void *data,
 378                 void *userdata) {
 379
 380         assert(filename);
 381         assert(lvalue);
 382         assert(rvalue);
 383
 384         log_set_target_from_string(rvalue);
 385         return 0;
 386 }
 387
 388 static int config_parse_color(
 389                 const char *filename,
 390                 unsigned line,
 391                 const char *section,
 392                 const char *lvalue,
 393                 const char *rvalue,
 394                 void *data,
 395                 void *userdata) {
 396
 397         assert(filename);
 398         assert(lvalue);
 399         assert(rvalue);
 400
 401         log_show_color_from_string(rvalue);
 402         return 0;
 403 }
 404
 405 static int config_parse_location(
 406                 const char *filename,
 407                 unsigned line,
 408                 const char *section,
 409                 const char *lvalue,
 410                 const char *rvalue,
 411                 void *data,
 412                 void *userdata) {
 413
 414         assert(filename);
 415         assert(lvalue);
 416         assert(rvalue);
 417
 418         log_show_location_from_string(rvalue);
 419         return 0;
 420 }
 421
 422 static int config_parse_cpu_affinity(
 423                 const char *filename,
 424                 unsigned line,
 425                 const char *section,
 426                 const char *lvalue,
 427                 const char *rvalue,
 428                 void *data,
 429                 void *userdata) {
 430
 431         char *w;
 432         size_t l;
 433         char *state;
 434         cpu_set_t *c = NULL;
 435         unsigned ncpus = 0;
 436
 437         assert(filename);
 438         assert(lvalue);
 439         assert(rvalue);
 440
 441         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 442                 char *t;
 443                 int r;
 444                 unsigned cpu;
 445
 446                 if (!(t = strndup(w, l)))
 447                         return -ENOMEM;
 448
 449                 r = safe_atou(t, &cpu);
 450                 free(t);
 451
 452                 if (!c)
 453                         if (!(c = cpu_set_malloc(&ncpus)))
 454                                 return -ENOMEM;
 455
 456                 if (r < 0 || cpu >= ncpus) {
 457                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 458                         CPU_FREE(c);
 459                         return -EBADMSG;
 460                 }
 461
 462                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 463         }
 464
 465         if (c) {
 466                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 467                         log_warning("Failed to set CPU affinity: %m");
 468
 469                 CPU_FREE(c);
 470         }
 471
 472         return 0;
 473 }
 474
 475 static int parse_config_file(void) {
 476
 477         const ConfigItem items[] = {
 478                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 479                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 480                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 481                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 482                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 483                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 484                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 485                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 486                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 487                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 488                 { "MountOnPlug", config_parse_bool,         &arg_mount_on_plug, "Manager" },
 489                 { "SwapOnPlug",  config_parse_bool,         &arg_swap_on_plug,  "Manager" },
 490                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 491                 { NULL, NULL, NULL, NULL }
 492         };
 493
 494         static const char * const sections[] = {
 495                 "Manager",
 496                 NULL
 497         };
 498
 499         FILE *f;
 500         const char *fn;
 501         int r;
 502
 503         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 504
 505         if (!(f = fopen(fn, "re"))) {
 506                 if (errno == ENOENT)
 507                         return 0;
 508
 509                 log_warning("Failed to open configuration file '%s': %m", fn);
 510                 return 0;
 511         }
 512
 513         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 514                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 515
 516         fclose(f);
 517
 518         return 0;
 519 }
 520
 521 static int parse_proc_cmdline(void) {
 522         char *line;
 523         int r;
 524         char *w;
 525         size_t l;
 526         char *state;
 527
 528         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 529                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 530                 return 0;
 531         }
 532
 533         FOREACH_WORD_QUOTED(w, l, line, state) {
 534                 char *word;
 535
 536                 if (!(word = strndup(w, l))) {
 537                         r = -ENOMEM;
 538                         goto finish;
 539                 }
 540
 541                 r = parse_proc_cmdline_word(word);
 542                 free(word);
 543
 544                 if (r < 0)
 545                         goto finish;
 546         }
 547
 548         r = 0;
 549
 550 finish:
 551         free(line);
 552         return r;
 553 }
 554
 555 static int parse_argv(int argc, char *argv[]) {
 556
 557         enum {
 558                 ARG_LOG_LEVEL = 0x100,
 559                 ARG_LOG_TARGET,
 560                 ARG_LOG_COLOR,
 561                 ARG_LOG_LOCATION,
 562                 ARG_UNIT,
 563                 ARG_SYSTEM,
 564                 ARG_SESSION,
 565                 ARG_TEST,
 566                 ARG_DUMP_CONFIGURATION_ITEMS,
 567                 ARG_DUMP_CORE,
 568                 ARG_CRASH_SHELL,
 569                 ARG_CONFIRM_SPAWN,
 570                 ARG_SHOW_STATUS,
 571                 ARG_SYSV_CONSOLE,
 572                 ARG_DESERIALIZE,
 573                 ARG_INTROSPECT
 574         };
 575
 576         static const struct option options[] = {
 577                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 578                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 579                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 580                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 581                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 582                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 583                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 584                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 585                 { "help",                     no_argument,       NULL, 'h'                          },
 586                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 587                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 588                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 589                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 590                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 591                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 592                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 593                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 594                 { NULL,                       0,                 NULL, 0                            }
 595         };
 596
 597         int c, r;
 598
 599         assert(argc >= 1);
 600         assert(argv);
 601
 602         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 603
 604                 switch (c) {
 605
 606                 case ARG_LOG_LEVEL:
 607                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 608                                 log_error("Failed to parse log level %s.", optarg);
 609                                 return r;
 610                         }
 611
 612                         break;
 613
 614                 case ARG_LOG_TARGET:
 615
 616                         if ((r = log_set_target_from_string(optarg)) < 0) {
 617                                 log_error("Failed to parse log target %s.", optarg);
 618                                 return r;
 619                         }
 620
 621                         break;
 622
 623                 case ARG_LOG_COLOR:
 624
 625                         if (optarg) {
 626                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 627                                         log_error("Failed to parse log color setting %s.", optarg);
 628                                         return r;
 629                                 }
 630                         } else
 631                                 log_show_color(true);
 632
 633                         break;
 634
 635                 case ARG_LOG_LOCATION:
 636
 637                         if (optarg) {
 638                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 639                                         log_error("Failed to parse log location setting %s.", optarg);
 640                                         return r;
 641                                 }
 642                         } else
 643                                 log_show_location(true);
 644
 645                         break;
 646
 647                 case ARG_UNIT:
 648
 649                         if ((r = set_default_unit(optarg)) < 0) {
 650                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 651                                 return r;
 652                         }
 653
 654                         break;
 655
 656                 case ARG_SYSTEM:
 657                         arg_running_as = MANAGER_SYSTEM;
 658                         break;
 659
 660                 case ARG_SESSION:
 661                         arg_running_as = MANAGER_SESSION;
 662                         break;
 663
 664                 case ARG_TEST:
 665                         arg_action = ACTION_TEST;
 666                         break;
 667
 668                 case ARG_DUMP_CONFIGURATION_ITEMS:
 669                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 670                         break;
 671
 672                 case ARG_DUMP_CORE:
 673                         arg_dump_core = true;
 674                         break;
 675
 676                 case ARG_CRASH_SHELL:
 677                         arg_crash_shell = true;
 678                         break;
 679
 680                 case ARG_CONFIRM_SPAWN:
 681                         arg_confirm_spawn = true;
 682                         break;
 683
 684                 case ARG_SHOW_STATUS:
 685
 686                         if (optarg) {
 687                                 if ((r = parse_boolean(optarg)) < 0) {
 688                                         log_error("Failed to show status boolean %s.", optarg);
 689                                         return r;
 690                                 }
 691                                 arg_show_status = r;
 692                         } else
 693                                 arg_show_status = true;
 694                         break;
 695
 696                 case ARG_SYSV_CONSOLE:
 697
 698                         if (optarg) {
 699                                 if ((r = parse_boolean(optarg)) < 0) {
 700                                         log_error("Failed to SysV console boolean %s.", optarg);
 701                                         return r;
 702                                 }
 703                                 arg_sysv_console = r;
 704                         } else
 705                                 arg_sysv_console = true;
 706                         break;
 707
 708                 case ARG_DESERIALIZE: {
 709                         int fd;
 710                         FILE *f;
 711
 712                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 713                                 log_error("Failed to parse deserialize option %s.", optarg);
 714                                 return r;
 715                         }
 716
 717                         if (!(f = fdopen(fd, "r"))) {
 718                                 log_error("Failed to open serialization fd: %m");
 719                                 return r;
 720                         }
 721
 722                         if (serialization)
 723                                 fclose(serialization);
 724
 725                         serialization = f;
 726
 727                         break;
 728                 }
 729
 730                 case ARG_INTROSPECT: {
 731                         const char * const * i = NULL;
 732
 733                         for (i = bus_interface_table; *i; i += 2)
 734                                 if (!optarg || streq(i[0], optarg)) {
 735                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 736                                               "<node>\n", stdout);
 737                                         fputs(i[1], stdout);
 738                                         fputs("</node>\n", stdout);
 739
 740                                         if (optarg)
 741                                                 break;
 742                                 }
 743
 744                         if (!i[0] && optarg)
 745                                 log_error("Unknown interface %s.", optarg);
 746
 747                         arg_action = ACTION_DONE;
 748                         break;
 749                 }
 750
 751                 case 'h':
 752                         arg_action = ACTION_HELP;
 753                         break;
 754
 755                 case 'D':
 756                         log_set_max_level(LOG_DEBUG);
 757                         break;
 758
 759                 case '?':
 760                         return -EINVAL;
 761
 762                 default:
 763                         log_error("Unknown option code %c", c);
 764                         return -EINVAL;
 765                 }
 766
 767         /* PID 1 will get the kernel arguments as parameters, which we
 768          * ignore and unconditionally read from
 769          * /proc/cmdline. However, we need to ignore those arguments
 770          * here. */
 771         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 772                 log_error("Excess arguments.");
 773                 return -EINVAL;
 774         }
 775
 776         return 0;
 777 }
 778
 779 static int help(void) {
 780
 781         printf("%s [OPTIONS...]\n\n"
 782                "Starts up and maintains the system or a session.\n\n"
 783                "  -h --help                      Show this help\n"
 784                "     --test                      Determine startup sequence, dump it and exit\n"
 785                "     --dump-configuration-items  Dump understood unit configuration items\n"
 786                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 787                "     --unit=UNIT                 Set default unit\n"
 788                "     --system                    Run a system instance, even if PID != 1\n"
 789                "     --session                   Run a session instance\n"
 790                "     --dump-core                 Dump core on crash\n"
 791                "     --crash-shell               Run shell on crash\n"
 792                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 793                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 794                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 795                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 796                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 797                "     --log-color[=0|1]           Highlight important log messages\n"
 798                "     --log-location[=0|1]        Include code location in log messages\n",
 799                program_invocation_short_name);
 800
 801         return 0;
 802 }
 803
 804 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 805         FILE *f = NULL;
 806         FDSet *fds = NULL;
 807         int r;
 808
 809         assert(m);
 810         assert(_f);
 811         assert(_fds);
 812
 813         if ((r = manager_open_serialization(m, &f)) < 0) {
 814                 log_error("Failed to create serialization faile: %s", strerror(-r));
 815                 goto fail;
 816         }
 817
 818         if (!(fds = fdset_new())) {
 819                 r = -ENOMEM;
 820                 log_error("Failed to allocate fd set: %s", strerror(-r));
 821                 goto fail;
 822         }
 823
 824         if ((r = manager_serialize(m, f, fds)) < 0) {
 825                 log_error("Failed to serialize state: %s", strerror(-r));
 826                 goto fail;
 827         }
 828
 829         if (fseeko(f, 0, SEEK_SET) < 0) {
 830                 log_error("Failed to rewind serialization fd: %m");
 831                 goto fail;
 832         }
 833
 834         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 835                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 836                 goto fail;
 837         }
 838
 839         if ((r = fdset_cloexec(fds, false)) < 0) {
 840                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 841                 goto fail;
 842         }
 843
 844         *_f = f;
 845         *_fds = fds;
 846
 847         return 0;
 848
 849 fail:
 850         fdset_free(fds);
 851
 852         if (f)
 853                 fclose(f);
 854
 855         return r;
 856 }
 857
 858 int main(int argc, char *argv[]) {
 859         Manager *m = NULL;
 860         int r, retval = 1;
 861         FDSet *fds = NULL;
 862         bool reexecute = false;
 863
 864         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 865                 /* This is compatbility support for SysV, where
 866                  * calling init as a user is identical to telinit. */
 867
 868                 errno = -ENOENT;
 869                 execv(SYSTEMCTL_BINARY_PATH, argv);
 870                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 871                 return 1;
 872         }
 873
 874         log_show_color(isatty(STDERR_FILENO) > 0);
 875         log_show_location(false);
 876         log_set_max_level(LOG_INFO);
 877
 878         if (getpid() == 1) {
 879                 arg_running_as = MANAGER_SYSTEM;
 880                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 881
 882                 if (label_init() < 0)
 883                         goto finish;
 884         } else {
 885                 arg_running_as = MANAGER_SESSION;
 886                 log_set_target(LOG_TARGET_CONSOLE);
 887         }
 888
 889         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 890                 goto finish;
 891
 892         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 893          * /proc/$PID/fd is available. */
 894         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 895                 if (mount_setup() < 0)
 896                         goto finish;
 897
 898         /* Reset all signal handlers. */
 899         assert_se(reset_all_signal_handlers() == 0);
 900
 901         /* If we are init, we can block sigkill. Yay. */
 902         ignore_signals(SIGNALS_IGNORE, -1);
 903
 904         if (parse_config_file() < 0)
 905                 goto finish;
 906
 907         if (arg_running_as == MANAGER_SYSTEM)
 908                 if (parse_proc_cmdline() < 0)
 909                         goto finish;
 910
 911         log_parse_environment();
 912
 913         if (parse_argv(argc, argv) < 0)
 914                 goto finish;
 915
 916         if (arg_action == ACTION_HELP) {
 917                 retval = help();
 918                 goto finish;
 919         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 920                 unit_dump_config_items(stdout);
 921                 retval = 0;
 922                 goto finish;
 923         } else if (arg_action == ACTION_DONE) {
 924                 retval = 0;
 925                 goto finish;
 926         }
 927
 928         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 929
 930         /* Remember open file descriptors for later deserialization */
 931         if (serialization) {
 932                 if ((r = fdset_new_fill(&fds)) < 0) {
 933                         log_error("Failed to allocate fd set: %s", strerror(-r));
 934                         goto finish;
 935                 }
 936
 937                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 938         } else
 939                 close_all_fds(NULL, 0);
 940
 941         /* Set up PATH unless it is already set */
 942         setenv("PATH",
 943                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 944                arg_running_as == MANAGER_SYSTEM);
 945
 946         /* Move out of the way, so that we won't block unmounts */
 947         assert_se(chdir("/")  == 0);
 948
 949         if (arg_running_as == MANAGER_SYSTEM) {
 950                 /* Become a session leader if we aren't one yet. */
 951                 setsid();
 952
 953                 /* Disable the umask logic */
 954                 umask(0);
 955         }
 956
 957         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 958         dbus_connection_set_change_sigpipe(FALSE);
 959
 960         /* Reset the console, but only if this is really init and we
 961          * are freshly booted */
 962         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 963                 console_setup(getpid() == 1 && !serialization);
 964                 make_null_stdio();
 965         }
 966
 967         /* Open the logging devices, if possible and necessary */
 968         log_open();
 969
 970         /* Make sure we leave a core dump without panicing the
 971          * kernel. */
 972         if (getpid() == 1)
 973                 install_crash_handler();
 974
 975         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
 976                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES ")", manager_running_as_to_string(arg_running_as));
 977
 978         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
 979                 if (arg_show_status)
 980                         status_welcome();
 981
 982                 kmod_setup();
 983                 hostname_setup();
 984                 loopback_setup();
 985         }
 986
 987         if ((r = manager_new(arg_running_as, &m)) < 0) {
 988                 log_error("Failed to allocate manager object: %s", strerror(-r));
 989                 goto finish;
 990         }
 991
 992         m->confirm_spawn = arg_confirm_spawn;
 993         m->show_status = arg_show_status;
 994         m->sysv_console = arg_sysv_console;
 995         m->mount_on_plug = arg_mount_on_plug;
 996         m->swap_on_plug = arg_swap_on_plug;
 997         m->mount_auto = arg_mount_auto;
 998
 999         if ((r = manager_startup(m, serialization, fds)) < 0)
1000                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1001
1002         if (fds) {
1003                 /* This will close all file descriptors that were opened, but
1004                  * not claimed by any unit. */
1005
1006                 fdset_free(fds);
1007                 fds = NULL;
1008         }
1009
1010         if (serialization) {
1011                 fclose(serialization);
1012                 serialization = NULL;
1013         } else {
1014                 DBusError error;
1015                 Unit *target = NULL;
1016
1017                 dbus_error_init(&error);
1018
1019                 log_debug("Activating default unit: %s", arg_default_unit);
1020
1021                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1022                         log_error("Failed to load default target: %s", bus_error(&error, r));
1023                         dbus_error_free(&error);
1024                 } else if (target->meta.load_state != UNIT_LOADED)
1025                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1026
1027                 if (!target || target->meta.load_state != UNIT_LOADED) {
1028                         log_info("Trying to load rescue target...");
1029
1030                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1031                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1032                                 dbus_error_free(&error);
1033                                 goto finish;
1034                         } else if (target->meta.load_state != UNIT_LOADED) {
1035                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1036                                 goto finish;
1037                         }
1038                 }
1039
1040                 if (arg_action == ACTION_TEST) {
1041                         printf("-> By units:\n");
1042                         manager_dump_units(m, stdout, "\t");
1043                 }
1044
1045                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1046                         log_error("Failed to start default target: %s", bus_error(&error, r));
1047                         dbus_error_free(&error);
1048                         goto finish;
1049                 }
1050
1051                 if (arg_action == ACTION_TEST) {
1052                         printf("-> By jobs:\n");
1053                         manager_dump_jobs(m, stdout, "\t");
1054                         retval = 0;
1055                         goto finish;
1056                 }
1057         }
1058
1059         for (;;) {
1060                 if ((r = manager_loop(m)) < 0) {
1061                         log_error("Failed to run mainloop: %s", strerror(-r));
1062                         goto finish;
1063                 }
1064
1065                 switch (m->exit_code) {
1066
1067                 case MANAGER_EXIT:
1068                         retval = 0;
1069                         log_debug("Exit.");
1070                         goto finish;
1071
1072                 case MANAGER_RELOAD:
1073                         log_info("Reloading.");
1074                         if ((r = manager_reload(m)) < 0)
1075                                 log_error("Failed to reload: %s", strerror(-r));
1076                         break;
1077
1078                 case MANAGER_REEXECUTE:
1079                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1080                                 goto finish;
1081
1082                         reexecute = true;
1083                         log_notice("Reexecuting.");
1084                         goto finish;
1085
1086                 default:
1087                         assert_not_reached("Unknown exit code.");
1088                 }
1089         }
1090
1091 finish:
1092         if (m)
1093                 manager_free(m);
1094
1095         free(arg_default_unit);
1096
1097         dbus_shutdown();
1098
1099         if (reexecute) {
1100                 const char *args[15];
1101                 unsigned i = 0;
1102                 char sfd[16];
1103
1104                 assert(serialization);
1105                 assert(fds);
1106
1107                 args[i++] = SYSTEMD_BINARY_PATH;
1108
1109                 args[i++] = "--log-level";
1110                 args[i++] = log_level_to_string(log_get_max_level());
1111
1112                 args[i++] = "--log-target";
1113                 args[i++] = log_target_to_string(log_get_target());
1114
1115                 if (arg_running_as == MANAGER_SYSTEM)
1116                         args[i++] = "--system";
1117                 else
1118                         args[i++] = "--session";
1119
1120                 if (arg_dump_core)
1121                         args[i++] = "--dump-core";
1122
1123                 if (arg_crash_shell)
1124                         args[i++] = "--crash-shell";
1125
1126                 if (arg_confirm_spawn)
1127                         args[i++] = "--confirm-spawn";
1128
1129                 if (arg_show_status)
1130                         args[i++] = "--show-status=1";
1131                 else
1132                         args[i++] = "--show-status=0";
1133
1134                 if (arg_sysv_console)
1135                         args[i++] = "--sysv-console=1";
1136                 else
1137                         args[i++] = "--sysv-console=0";
1138
1139                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1140                 char_array_0(sfd);
1141
1142                 args[i++] = "--deserialize";
1143                 args[i++] = sfd;
1144
1145                 args[i++] = NULL;
1146
1147                 assert(i <= ELEMENTSOF(args));
1148
1149                 execv(args[0], (char* const*) args);
1150
1151                 log_error("Failed to reexecute: %m");
1152         }
1153
1154         if (serialization)
1155                 fclose(serialization);
1156
1157         if (fds)
1158                 fdset_free(fds);
1159
1160         if (getpid() == 1)
1161                 freeze();
1162
1163         label_finish();
1164
1165         return retval;
1166 }