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 "locale-setup.h"
  42 #include "load-fragment.h"
  43 #include "fdset.h"
  44 #include "special.h"
  45 #include "conf-parser.h"
  46 #include "bus-errors.h"
  47 #include "missing.h"
  48 #include "label.h"
  49 #include "build.h"
  50
  51 static enum {
  52         ACTION_RUN,
  53         ACTION_HELP,
  54         ACTION_TEST,
  55         ACTION_DUMP_CONFIGURATION_ITEMS,
  56         ACTION_DONE
  57 } arg_action = ACTION_RUN;
  58
  59 static char *arg_default_unit = NULL;
  60 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  61
  62 static bool arg_dump_core = true;
  63 static bool arg_crash_shell = false;
  64 static int arg_crash_chvt = -1;
  65 static bool arg_confirm_spawn = false;
  66 static bool arg_show_status = true;
  67 static bool arg_sysv_console = true;
  68 static bool arg_mount_auto = true;
  69 static bool arg_swap_auto = true;
  70 static char *arg_console = NULL;
  71
  72 static FILE* serialization = NULL;
  73
  74 _noreturn_ static void freeze(void) {
  75         for (;;)
  76                 pause();
  77 }
  78
  79 static void nop_handler(int sig) {
  80 }
  81
  82 _noreturn_ static void crash(int sig) {
  83
  84         if (!arg_dump_core)
  85                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  86         else {
  87                 struct sigaction sa;
  88                 pid_t pid;
  89
  90                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  91                 zero(sa);
  92                 sa.sa_handler = nop_handler;
  93                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  94                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  95
  96                 if ((pid = fork()) < 0)
  97                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  98
  99                 else if (pid == 0) {
 100                         struct rlimit rl;
 101
 102                         /* Enable default signal handler for core dump */
 103                         zero(sa);
 104                         sa.sa_handler = SIG_DFL;
 105                         assert_se(sigaction(sig, &sa, NULL) == 0);
 106
 107                         /* Don't limit the core dump size */
 108                         zero(rl);
 109                         rl.rlim_cur = RLIM_INFINITY;
 110                         rl.rlim_max = RLIM_INFINITY;
 111                         setrlimit(RLIMIT_CORE, &rl);
 112
 113                         /* Just to be sure... */
 114                         assert_se(chdir("/") == 0);
 115
 116                         /* Raise the signal again */
 117                         raise(sig);
 118
 119                         assert_not_reached("We shouldn't be here...");
 120                         _exit(1);
 121
 122                 } else {
 123                         siginfo_t status;
 124                         int r;
 125
 126                         /* Order things nicely. */
 127                         if ((r = wait_for_terminate(pid, &status)) < 0)
 128                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
 129                         else if (status.si_code != CLD_DUMPED)
 130                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 131                         else
 132                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 133                 }
 134         }
 135
 136         if (arg_crash_chvt)
 137                 chvt(arg_crash_chvt);
 138
 139         if (arg_crash_shell) {
 140                 struct sigaction sa;
 141                 pid_t pid;
 142
 143                 log_info("Executing crash shell in 10s...");
 144                 sleep(10);
 145
 146                 /* Let the kernel reap children for us */
 147                 zero(sa);
 148                 sa.sa_handler = SIG_IGN;
 149                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 150                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 151
 152                 if ((pid = fork()) < 0)
 153                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 154                 else if (pid == 0) {
 155                         int fd, r;
 156
 157                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 158                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 159                         else if ((r = make_stdio(fd)) < 0)
 160                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 161
 162                         execl("/bin/sh", "/bin/sh", NULL);
 163
 164                         log_error("execl() failed: %s", strerror(errno));
 165                         _exit(1);
 166                 }
 167
 168                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 169         }
 170
 171         log_info("Freezing execution.");
 172         freeze();
 173 }
 174
 175 static void install_crash_handler(void) {
 176         struct sigaction sa;
 177
 178         zero(sa);
 179
 180         sa.sa_handler = crash;
 181         sa.sa_flags = SA_NODEFER;
 182
 183         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 184 }
 185
 186 static int make_null_stdio(void) {
 187         int null_fd, r;
 188
 189         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 190                 log_error("Failed to open /dev/null: %m");
 191                 return -errno;
 192         }
 193
 194         if ((r = make_stdio(null_fd)) < 0)
 195                 log_warning("Failed to dup2() device: %s", strerror(-r));
 196
 197         return r;
 198 }
 199
 200 static int console_setup(bool do_reset) {
 201         int tty_fd, r;
 202
 203         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 204          * and make sure we don't have a controlling tty. */
 205
 206         release_terminal();
 207
 208         if (!do_reset)
 209                 return 0;
 210
 211         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 212                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 213                 return -tty_fd;
 214         }
 215
 216         if ((r = reset_terminal(tty_fd)) < 0)
 217                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 218
 219         close_nointr_nofail(tty_fd);
 220         return r;
 221 }
 222
 223 static int set_default_unit(const char *u) {
 224         char *c;
 225
 226         assert(u);
 227
 228         if (!(c = strdup(u)))
 229                 return -ENOMEM;
 230
 231         free(arg_default_unit);
 232         arg_default_unit = c;
 233         return 0;
 234 }
 235
 236 static int parse_proc_cmdline_word(const char *word) {
 237
 238         static const char * const rlmap[] = {
 239                 "emergency", SPECIAL_EMERGENCY_TARGET,
 240                 "single",    SPECIAL_RESCUE_TARGET,
 241                 "-s",        SPECIAL_RESCUE_TARGET,
 242                 "s",         SPECIAL_RESCUE_TARGET,
 243                 "S",         SPECIAL_RESCUE_TARGET,
 244                 "1",         SPECIAL_RESCUE_TARGET,
 245                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 246                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 247                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 248                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 249         };
 250
 251         assert(word);
 252
 253         if (startswith(word, "systemd.unit="))
 254                 return set_default_unit(word + 13);
 255
 256         else if (startswith(word, "systemd.log_target=")) {
 257
 258                 if (log_set_target_from_string(word + 19) < 0)
 259                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 260
 261         } else if (startswith(word, "systemd.log_level=")) {
 262
 263                 if (log_set_max_level_from_string(word + 18) < 0)
 264                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 265
 266         } else if (startswith(word, "systemd.log_color=")) {
 267
 268                 if (log_show_color_from_string(word + 18) < 0)
 269                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 270
 271         } else if (startswith(word, "systemd.log_location=")) {
 272
 273                 if (log_show_location_from_string(word + 21) < 0)
 274                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 275
 276         } else if (startswith(word, "systemd.dump_core=")) {
 277                 int r;
 278
 279                 if ((r = parse_boolean(word + 18)) < 0)
 280                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 281                 else
 282                         arg_dump_core = r;
 283
 284         } else if (startswith(word, "systemd.crash_shell=")) {
 285                 int r;
 286
 287                 if ((r = parse_boolean(word + 20)) < 0)
 288                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 289                 else
 290                         arg_crash_shell = r;
 291
 292         } else if (startswith(word, "systemd.confirm_spawn=")) {
 293                 int r;
 294
 295                 if ((r = parse_boolean(word + 22)) < 0)
 296                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 297                 else
 298                         arg_confirm_spawn = r;
 299
 300         } else if (startswith(word, "systemd.crash_chvt=")) {
 301                 int k;
 302
 303                 if (safe_atoi(word + 19, &k) < 0)
 304                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 305                 else
 306                         arg_crash_chvt = k;
 307
 308         } else if (startswith(word, "systemd.show_status=")) {
 309                 int r;
 310
 311                 if ((r = parse_boolean(word + 20)) < 0)
 312                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 313                 else
 314                         arg_show_status = r;
 315
 316         } else if (startswith(word, "systemd.sysv_console=")) {
 317                 int r;
 318
 319                 if ((r = parse_boolean(word + 21)) < 0)
 320                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 321                 else
 322                         arg_sysv_console = r;
 323
 324         } else if (startswith(word, "systemd.")) {
 325
 326                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 327
 328                 log_info("Supported kernel switches:\n"
 329                          "systemd.unit=UNIT                        Default unit to start\n"
 330                          "systemd.dump_core=0|1                    Dump core on crash\n"
 331                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 332                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 333                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 334                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 335                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 336                          "systemd.log_target=console|kmsg|syslog|syslog-org-kmsg|null\n"
 337                          "                                         Log target\n"
 338                          "systemd.log_level=LEVEL                  Log level\n"
 339                          "systemd.log_color=0|1                    Highlight important log messages\n"
 340                          "systemd.log_location=0|1                 Include code location in log messages\n");
 341
 342         } else if (startswith(word, "console=")) {
 343                 const char *k;
 344                 size_t l;
 345                 char *w = NULL;
 346
 347                 k = word + 8;
 348                 l = strcspn(k, ",");
 349
 350                 /* Ignore the console setting if set to a VT */
 351                 if (l < 4 ||
 352                     !startswith(k, "tty") ||
 353                     k[3+strspn(k+3, "0123456789")] != 0) {
 354
 355                         if (!(w = strndup(k, l)))
 356                                 return -ENOMEM;
 357                 }
 358
 359                 free(arg_console);
 360                 arg_console = w;
 361
 362         } else if (streq(word, "quiet")) {
 363                 arg_show_status = false;
 364                 arg_sysv_console = false;
 365         } else {
 366                 unsigned i;
 367
 368                 /* SysV compatibility */
 369                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 370                         if (streq(word, rlmap[i]))
 371                                 return set_default_unit(rlmap[i+1]);
 372         }
 373
 374         return 0;
 375 }
 376
 377 static int config_parse_level(
 378                 const char *filename,
 379                 unsigned line,
 380                 const char *section,
 381                 const char *lvalue,
 382                 const char *rvalue,
 383                 void *data,
 384                 void *userdata) {
 385
 386         assert(filename);
 387         assert(lvalue);
 388         assert(rvalue);
 389
 390         log_set_max_level_from_string(rvalue);
 391         return 0;
 392 }
 393
 394 static int config_parse_target(
 395                 const char *filename,
 396                 unsigned line,
 397                 const char *section,
 398                 const char *lvalue,
 399                 const char *rvalue,
 400                 void *data,
 401                 void *userdata) {
 402
 403         assert(filename);
 404         assert(lvalue);
 405         assert(rvalue);
 406
 407         log_set_target_from_string(rvalue);
 408         return 0;
 409 }
 410
 411 static int config_parse_color(
 412                 const char *filename,
 413                 unsigned line,
 414                 const char *section,
 415                 const char *lvalue,
 416                 const char *rvalue,
 417                 void *data,
 418                 void *userdata) {
 419
 420         assert(filename);
 421         assert(lvalue);
 422         assert(rvalue);
 423
 424         log_show_color_from_string(rvalue);
 425         return 0;
 426 }
 427
 428 static int config_parse_location(
 429                 const char *filename,
 430                 unsigned line,
 431                 const char *section,
 432                 const char *lvalue,
 433                 const char *rvalue,
 434                 void *data,
 435                 void *userdata) {
 436
 437         assert(filename);
 438         assert(lvalue);
 439         assert(rvalue);
 440
 441         log_show_location_from_string(rvalue);
 442         return 0;
 443 }
 444
 445 static int config_parse_cpu_affinity(
 446                 const char *filename,
 447                 unsigned line,
 448                 const char *section,
 449                 const char *lvalue,
 450                 const char *rvalue,
 451                 void *data,
 452                 void *userdata) {
 453
 454         char *w;
 455         size_t l;
 456         char *state;
 457         cpu_set_t *c = NULL;
 458         unsigned ncpus = 0;
 459
 460         assert(filename);
 461         assert(lvalue);
 462         assert(rvalue);
 463
 464         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 465                 char *t;
 466                 int r;
 467                 unsigned cpu;
 468
 469                 if (!(t = strndup(w, l)))
 470                         return -ENOMEM;
 471
 472                 r = safe_atou(t, &cpu);
 473                 free(t);
 474
 475                 if (!c)
 476                         if (!(c = cpu_set_malloc(&ncpus)))
 477                                 return -ENOMEM;
 478
 479                 if (r < 0 || cpu >= ncpus) {
 480                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 481                         CPU_FREE(c);
 482                         return -EBADMSG;
 483                 }
 484
 485                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 486         }
 487
 488         if (c) {
 489                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 490                         log_warning("Failed to set CPU affinity: %m");
 491
 492                 CPU_FREE(c);
 493         }
 494
 495         return 0;
 496 }
 497
 498 static int parse_config_file(void) {
 499
 500         const ConfigItem items[] = {
 501                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 502                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 503                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 504                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 505                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 506                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 507                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 508                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 509                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 510                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 511                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 512                 { "SwapAuto",    config_parse_bool,         &arg_swap_auto,     "Manager" },
 513                 { NULL, NULL, NULL, NULL }
 514         };
 515
 516         static const char * const sections[] = {
 517                 "Manager",
 518                 NULL
 519         };
 520
 521         FILE *f;
 522         const char *fn;
 523         int r;
 524
 525         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 526
 527         if (!(f = fopen(fn, "re"))) {
 528                 if (errno == ENOENT)
 529                         return 0;
 530
 531                 log_warning("Failed to open configuration file '%s': %m", fn);
 532                 return 0;
 533         }
 534
 535         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 536                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 537
 538         fclose(f);
 539
 540         return 0;
 541 }
 542
 543 static int parse_proc_cmdline(void) {
 544         char *line;
 545         int r;
 546         char *w;
 547         size_t l;
 548         char *state;
 549
 550         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 551                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 552                 return 0;
 553         }
 554
 555         FOREACH_WORD_QUOTED(w, l, line, state) {
 556                 char *word;
 557
 558                 if (!(word = strndup(w, l))) {
 559                         r = -ENOMEM;
 560                         goto finish;
 561                 }
 562
 563                 r = parse_proc_cmdline_word(word);
 564                 free(word);
 565
 566                 if (r < 0)
 567                         goto finish;
 568         }
 569
 570         r = 0;
 571
 572 finish:
 573         free(line);
 574         return r;
 575 }
 576
 577 static int parse_argv(int argc, char *argv[]) {
 578
 579         enum {
 580                 ARG_LOG_LEVEL = 0x100,
 581                 ARG_LOG_TARGET,
 582                 ARG_LOG_COLOR,
 583                 ARG_LOG_LOCATION,
 584                 ARG_UNIT,
 585                 ARG_SYSTEM,
 586                 ARG_SESSION,
 587                 ARG_TEST,
 588                 ARG_DUMP_CONFIGURATION_ITEMS,
 589                 ARG_DUMP_CORE,
 590                 ARG_CRASH_SHELL,
 591                 ARG_CONFIRM_SPAWN,
 592                 ARG_SHOW_STATUS,
 593                 ARG_SYSV_CONSOLE,
 594                 ARG_DESERIALIZE,
 595                 ARG_INTROSPECT
 596         };
 597
 598         static const struct option options[] = {
 599                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 600                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 601                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 602                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 603                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 604                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 605                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 606                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 607                 { "help",                     no_argument,       NULL, 'h'                          },
 608                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 609                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 610                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 611                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 612                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 613                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 614                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 615                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 616                 { NULL,                       0,                 NULL, 0                            }
 617         };
 618
 619         int c, r;
 620
 621         assert(argc >= 1);
 622         assert(argv);
 623
 624         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 625
 626                 switch (c) {
 627
 628                 case ARG_LOG_LEVEL:
 629                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 630                                 log_error("Failed to parse log level %s.", optarg);
 631                                 return r;
 632                         }
 633
 634                         break;
 635
 636                 case ARG_LOG_TARGET:
 637
 638                         if ((r = log_set_target_from_string(optarg)) < 0) {
 639                                 log_error("Failed to parse log target %s.", optarg);
 640                                 return r;
 641                         }
 642
 643                         break;
 644
 645                 case ARG_LOG_COLOR:
 646
 647                         if (optarg) {
 648                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 649                                         log_error("Failed to parse log color setting %s.", optarg);
 650                                         return r;
 651                                 }
 652                         } else
 653                                 log_show_color(true);
 654
 655                         break;
 656
 657                 case ARG_LOG_LOCATION:
 658
 659                         if (optarg) {
 660                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 661                                         log_error("Failed to parse log location setting %s.", optarg);
 662                                         return r;
 663                                 }
 664                         } else
 665                                 log_show_location(true);
 666
 667                         break;
 668
 669                 case ARG_UNIT:
 670
 671                         if ((r = set_default_unit(optarg)) < 0) {
 672                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 673                                 return r;
 674                         }
 675
 676                         break;
 677
 678                 case ARG_SYSTEM:
 679                         arg_running_as = MANAGER_SYSTEM;
 680                         break;
 681
 682                 case ARG_SESSION:
 683                         arg_running_as = MANAGER_SESSION;
 684                         break;
 685
 686                 case ARG_TEST:
 687                         arg_action = ACTION_TEST;
 688                         break;
 689
 690                 case ARG_DUMP_CONFIGURATION_ITEMS:
 691                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 692                         break;
 693
 694                 case ARG_DUMP_CORE:
 695                         arg_dump_core = true;
 696                         break;
 697
 698                 case ARG_CRASH_SHELL:
 699                         arg_crash_shell = true;
 700                         break;
 701
 702                 case ARG_CONFIRM_SPAWN:
 703                         arg_confirm_spawn = true;
 704                         break;
 705
 706                 case ARG_SHOW_STATUS:
 707
 708                         if (optarg) {
 709                                 if ((r = parse_boolean(optarg)) < 0) {
 710                                         log_error("Failed to show status boolean %s.", optarg);
 711                                         return r;
 712                                 }
 713                                 arg_show_status = r;
 714                         } else
 715                                 arg_show_status = true;
 716                         break;
 717
 718                 case ARG_SYSV_CONSOLE:
 719
 720                         if (optarg) {
 721                                 if ((r = parse_boolean(optarg)) < 0) {
 722                                         log_error("Failed to SysV console boolean %s.", optarg);
 723                                         return r;
 724                                 }
 725                                 arg_sysv_console = r;
 726                         } else
 727                                 arg_sysv_console = true;
 728                         break;
 729
 730                 case ARG_DESERIALIZE: {
 731                         int fd;
 732                         FILE *f;
 733
 734                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 735                                 log_error("Failed to parse deserialize option %s.", optarg);
 736                                 return r;
 737                         }
 738
 739                         if (!(f = fdopen(fd, "r"))) {
 740                                 log_error("Failed to open serialization fd: %m");
 741                                 return r;
 742                         }
 743
 744                         if (serialization)
 745                                 fclose(serialization);
 746
 747                         serialization = f;
 748
 749                         break;
 750                 }
 751
 752                 case ARG_INTROSPECT: {
 753                         const char * const * i = NULL;
 754
 755                         for (i = bus_interface_table; *i; i += 2)
 756                                 if (!optarg || streq(i[0], optarg)) {
 757                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 758                                               "<node>\n", stdout);
 759                                         fputs(i[1], stdout);
 760                                         fputs("</node>\n", stdout);
 761
 762                                         if (optarg)
 763                                                 break;
 764                                 }
 765
 766                         if (!i[0] && optarg)
 767                                 log_error("Unknown interface %s.", optarg);
 768
 769                         arg_action = ACTION_DONE;
 770                         break;
 771                 }
 772
 773                 case 'h':
 774                         arg_action = ACTION_HELP;
 775                         break;
 776
 777                 case 'D':
 778                         log_set_max_level(LOG_DEBUG);
 779                         break;
 780
 781                 case '?':
 782                         return -EINVAL;
 783
 784                 default:
 785                         log_error("Unknown option code %c", c);
 786                         return -EINVAL;
 787                 }
 788
 789         /* PID 1 will get the kernel arguments as parameters, which we
 790          * ignore and unconditionally read from
 791          * /proc/cmdline. However, we need to ignore those arguments
 792          * here. */
 793         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 794                 log_error("Excess arguments.");
 795                 return -EINVAL;
 796         }
 797
 798         return 0;
 799 }
 800
 801 static int help(void) {
 802
 803         printf("%s [OPTIONS...]\n\n"
 804                "Starts up and maintains the system or a session.\n\n"
 805                "  -h --help                      Show this help\n"
 806                "     --test                      Determine startup sequence, dump it and exit\n"
 807                "     --dump-configuration-items  Dump understood unit configuration items\n"
 808                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 809                "     --unit=UNIT                 Set default unit\n"
 810                "     --system                    Run a system instance, even if PID != 1\n"
 811                "     --session                   Run a session instance\n"
 812                "     --dump-core                 Dump core on crash\n"
 813                "     --crash-shell               Run shell on crash\n"
 814                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 815                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 816                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 817                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 818                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 819                "     --log-color[=0|1]           Highlight important log messages\n"
 820                "     --log-location[=0|1]        Include code location in log messages\n",
 821                program_invocation_short_name);
 822
 823         return 0;
 824 }
 825
 826 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 827         FILE *f = NULL;
 828         FDSet *fds = NULL;
 829         int r;
 830
 831         assert(m);
 832         assert(_f);
 833         assert(_fds);
 834
 835         if ((r = manager_open_serialization(m, &f)) < 0) {
 836                 log_error("Failed to create serialization faile: %s", strerror(-r));
 837                 goto fail;
 838         }
 839
 840         if (!(fds = fdset_new())) {
 841                 r = -ENOMEM;
 842                 log_error("Failed to allocate fd set: %s", strerror(-r));
 843                 goto fail;
 844         }
 845
 846         if ((r = manager_serialize(m, f, fds)) < 0) {
 847                 log_error("Failed to serialize state: %s", strerror(-r));
 848                 goto fail;
 849         }
 850
 851         if (fseeko(f, 0, SEEK_SET) < 0) {
 852                 log_error("Failed to rewind serialization fd: %m");
 853                 goto fail;
 854         }
 855
 856         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 857                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 858                 goto fail;
 859         }
 860
 861         if ((r = fdset_cloexec(fds, false)) < 0) {
 862                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 863                 goto fail;
 864         }
 865
 866         *_f = f;
 867         *_fds = fds;
 868
 869         return 0;
 870
 871 fail:
 872         fdset_free(fds);
 873
 874         if (f)
 875                 fclose(f);
 876
 877         return r;
 878 }
 879
 880 int main(int argc, char *argv[]) {
 881         Manager *m = NULL;
 882         int r, retval = EXIT_FAILURE;
 883         FDSet *fds = NULL;
 884         bool reexecute = false;
 885
 886         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 887                 /* This is compatbility support for SysV, where
 888                  * calling init as a user is identical to telinit. */
 889
 890                 errno = -ENOENT;
 891                 execv(SYSTEMCTL_BINARY_PATH, argv);
 892                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 893                 return 1;
 894         }
 895
 896         log_show_color(isatty(STDERR_FILENO) > 0);
 897         log_show_location(false);
 898         log_set_max_level(LOG_INFO);
 899
 900         if (getpid() == 1) {
 901                 arg_running_as = MANAGER_SYSTEM;
 902                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 903
 904                 if (label_init() < 0)
 905                         goto finish;
 906         } else {
 907                 arg_running_as = MANAGER_SESSION;
 908                 log_set_target(LOG_TARGET_CONSOLE);
 909         }
 910
 911         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 912                 goto finish;
 913
 914         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 915          * /proc/$PID/fd is available. */
 916         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 917                 if (mount_setup() < 0)
 918                         goto finish;
 919
 920         /* Reset all signal handlers. */
 921         assert_se(reset_all_signal_handlers() == 0);
 922
 923         /* If we are init, we can block sigkill. Yay. */
 924         ignore_signals(SIGNALS_IGNORE, -1);
 925
 926         if (parse_config_file() < 0)
 927                 goto finish;
 928
 929         if (arg_running_as == MANAGER_SYSTEM)
 930                 if (parse_proc_cmdline() < 0)
 931                         goto finish;
 932
 933         log_parse_environment();
 934
 935         if (parse_argv(argc, argv) < 0)
 936                 goto finish;
 937
 938         if (arg_action == ACTION_HELP) {
 939                 retval = help();
 940                 goto finish;
 941         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 942                 unit_dump_config_items(stdout);
 943                 retval = EXIT_SUCCESS;
 944                 goto finish;
 945         } else if (arg_action == ACTION_DONE) {
 946                 retval = EXIT_SUCCESS;
 947                 goto finish;
 948         }
 949
 950         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 951
 952         /* Remember open file descriptors for later deserialization */
 953         if (serialization) {
 954                 if ((r = fdset_new_fill(&fds)) < 0) {
 955                         log_error("Failed to allocate fd set: %s", strerror(-r));
 956                         goto finish;
 957                 }
 958
 959                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 960         } else
 961                 close_all_fds(NULL, 0);
 962
 963         /* Set up PATH unless it is already set */
 964         setenv("PATH",
 965                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 966                arg_running_as == MANAGER_SYSTEM);
 967
 968         /* Move out of the way, so that we won't block unmounts */
 969         assert_se(chdir("/")  == 0);
 970
 971         if (arg_running_as == MANAGER_SYSTEM) {
 972                 /* Become a session leader if we aren't one yet. */
 973                 setsid();
 974
 975                 /* Disable the umask logic */
 976                 umask(0);
 977         }
 978
 979         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 980         dbus_connection_set_change_sigpipe(FALSE);
 981
 982         /* Reset the console, but only if this is really init and we
 983          * are freshly booted */
 984         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 985                 console_setup(getpid() == 1 && !serialization);
 986                 make_null_stdio();
 987         }
 988
 989         /* Open the logging devices, if possible and necessary */
 990         log_open();
 991
 992         /* Make sure we leave a core dump without panicing the
 993          * kernel. */
 994         if (getpid() == 1)
 995                 install_crash_handler();
 996
 997         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
 998                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
 999
1000         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1001                 locale_setup();
1002
1003                 if (arg_show_status)
1004                         status_welcome();
1005
1006                 kmod_setup();
1007                 hostname_setup();
1008                 loopback_setup();
1009
1010                 mkdir_p("/dev/.systemd/ask-password/", 0755);
1011         }
1012
1013         if ((r = manager_new(arg_running_as, &m)) < 0) {
1014                 log_error("Failed to allocate manager object: %s", strerror(-r));
1015                 goto finish;
1016         }
1017
1018         m->confirm_spawn = arg_confirm_spawn;
1019         m->show_status = arg_show_status;
1020         m->sysv_console = arg_sysv_console;
1021         m->mount_auto = arg_mount_auto;
1022         m->swap_auto = arg_swap_auto;
1023
1024         if (arg_console)
1025                 manager_set_console(m, arg_console);
1026
1027         if ((r = manager_startup(m, serialization, fds)) < 0)
1028                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1029
1030         if (fds) {
1031                 /* This will close all file descriptors that were opened, but
1032                  * not claimed by any unit. */
1033
1034                 fdset_free(fds);
1035                 fds = NULL;
1036         }
1037
1038         if (serialization) {
1039                 fclose(serialization);
1040                 serialization = NULL;
1041         } else {
1042                 DBusError error;
1043                 Unit *target = NULL;
1044
1045                 dbus_error_init(&error);
1046
1047                 log_debug("Activating default unit: %s", arg_default_unit);
1048
1049                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1050                         log_error("Failed to load default target: %s", bus_error(&error, r));
1051                         dbus_error_free(&error);
1052                 } else if (target->meta.load_state != UNIT_LOADED)
1053                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1054
1055                 if (!target || target->meta.load_state != UNIT_LOADED) {
1056                         log_info("Trying to load rescue target...");
1057
1058                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1059                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1060                                 dbus_error_free(&error);
1061                                 goto finish;
1062                         } else if (target->meta.load_state != UNIT_LOADED) {
1063                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1064                                 goto finish;
1065                         }
1066                 }
1067
1068                 if (arg_action == ACTION_TEST) {
1069                         printf("-> By units:\n");
1070                         manager_dump_units(m, stdout, "\t");
1071                 }
1072
1073                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1074                         log_error("Failed to start default target: %s", bus_error(&error, r));
1075                         dbus_error_free(&error);
1076                         goto finish;
1077                 }
1078
1079                 if (arg_action == ACTION_TEST) {
1080                         printf("-> By jobs:\n");
1081                         manager_dump_jobs(m, stdout, "\t");
1082                         retval = EXIT_SUCCESS;
1083                         goto finish;
1084                 }
1085         }
1086
1087         for (;;) {
1088                 if ((r = manager_loop(m)) < 0) {
1089                         log_error("Failed to run mainloop: %s", strerror(-r));
1090                         goto finish;
1091                 }
1092
1093                 switch (m->exit_code) {
1094
1095                 case MANAGER_EXIT:
1096                         retval = EXIT_SUCCESS;
1097                         log_debug("Exit.");
1098                         goto finish;
1099
1100                 case MANAGER_RELOAD:
1101                         log_info("Reloading.");
1102                         if ((r = manager_reload(m)) < 0)
1103                                 log_error("Failed to reload: %s", strerror(-r));
1104                         break;
1105
1106                 case MANAGER_REEXECUTE:
1107                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1108                                 goto finish;
1109
1110                         reexecute = true;
1111                         log_notice("Reexecuting.");
1112                         goto finish;
1113
1114                 default:
1115                         assert_not_reached("Unknown exit code.");
1116                 }
1117         }
1118
1119 finish:
1120         if (m)
1121                 manager_free(m);
1122
1123         free(arg_default_unit);
1124         free(arg_console);
1125
1126         dbus_shutdown();
1127
1128         label_finish();
1129
1130         if (reexecute) {
1131                 const char *args[15];
1132                 unsigned i = 0;
1133                 char sfd[16];
1134
1135                 assert(serialization);
1136                 assert(fds);
1137
1138                 args[i++] = SYSTEMD_BINARY_PATH;
1139
1140                 args[i++] = "--log-level";
1141                 args[i++] = log_level_to_string(log_get_max_level());
1142
1143                 args[i++] = "--log-target";
1144                 args[i++] = log_target_to_string(log_get_target());
1145
1146                 if (arg_running_as == MANAGER_SYSTEM)
1147                         args[i++] = "--system";
1148                 else
1149                         args[i++] = "--session";
1150
1151                 if (arg_dump_core)
1152                         args[i++] = "--dump-core";
1153
1154                 if (arg_crash_shell)
1155                         args[i++] = "--crash-shell";
1156
1157                 if (arg_confirm_spawn)
1158                         args[i++] = "--confirm-spawn";
1159
1160                 if (arg_show_status)
1161                         args[i++] = "--show-status=1";
1162                 else
1163                         args[i++] = "--show-status=0";
1164
1165                 if (arg_sysv_console)
1166                         args[i++] = "--sysv-console=1";
1167                 else
1168                         args[i++] = "--sysv-console=0";
1169
1170                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1171                 char_array_0(sfd);
1172
1173                 args[i++] = "--deserialize";
1174                 args[i++] = sfd;
1175
1176                 args[i++] = NULL;
1177
1178                 assert(i <= ELEMENTSOF(args));
1179
1180                 execv(args[0], (char* const*) args);
1181
1182                 log_error("Failed to reexecute: %m");
1183         }
1184
1185         if (serialization)
1186                 fclose(serialization);
1187
1188         if (fds)
1189                 fdset_free(fds);
1190
1191         if (getpid() == 1)
1192                 freeze();
1193
1194         return retval;
1195 }