src/main.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <dbus/dbus.h>
  23
  24 #include <stdio.h>
  25 #include <errno.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <getopt.h>
  31 #include <signal.h>
  32 #include <sys/wait.h>
  33 #include <fcntl.h>
  34
  35 #include "manager.h"
  36 #include "log.h"
  37 #include "mount-setup.h"
  38 #include "hostname-setup.h"
  39 #include "loopback-setup.h"
  40 #include "kmod-setup.h"
  41 #include "load-fragment.h"
  42 #include "fdset.h"
  43 #include "special.h"
  44 #include "conf-parser.h"
  45 #include "bus-errors.h"
  46 #include "missing.h"
  47 #include "label.h"
  48 #include "build.h"
  49
  50 static enum {
  51         ACTION_RUN,
  52         ACTION_HELP,
  53         ACTION_TEST,
  54         ACTION_DUMP_CONFIGURATION_ITEMS,
  55         ACTION_DONE
  56 } arg_action = ACTION_RUN;
  57
  58 static char *arg_default_unit = NULL;
  59 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  60
  61 static bool arg_dump_core = true;
  62 static bool arg_crash_shell = false;
  63 static int arg_crash_chvt = -1;
  64 static bool arg_confirm_spawn = false;
  65 static bool arg_show_status = true;
  66 static bool arg_sysv_console = true;
  67 static bool arg_mount_auto = true;
  68 static bool arg_swap_auto = true;
  69 static char *arg_console = NULL;
  70
  71 static FILE* serialization = NULL;
  72
  73 _noreturn_ static void freeze(void) {
  74         for (;;)
  75                 pause();
  76 }
  77
  78 static void nop_handler(int sig) {
  79 }
  80
  81 _noreturn_ static void crash(int sig) {
  82
  83         if (!arg_dump_core)
  84                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  85         else {
  86                 struct sigaction sa;
  87                 pid_t pid;
  88
  89                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  90                 zero(sa);
  91                 sa.sa_handler = nop_handler;
  92                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  93                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  94
  95                 if ((pid = fork()) < 0)
  96                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  97
  98                 else if (pid == 0) {
  99                         struct rlimit rl;
 100
 101                         /* Enable default signal handler for core dump */
 102                         zero(sa);
 103                         sa.sa_handler = SIG_DFL;
 104                         assert_se(sigaction(sig, &sa, NULL) == 0);
 105
 106                         /* Don't limit the core dump size */
 107                         zero(rl);
 108                         rl.rlim_cur = RLIM_INFINITY;
 109                         rl.rlim_max = RLIM_INFINITY;
 110                         setrlimit(RLIMIT_CORE, &rl);
 111
 112                         /* Just to be sure... */
 113                         assert_se(chdir("/") == 0);
 114
 115                         /* Raise the signal again */
 116                         raise(sig);
 117
 118                         assert_not_reached("We shouldn't be here...");
 119                         _exit(1);
 120
 121                 } else {
 122                         int status;
 123
 124                         /* Order things nicely. */
 125                         if (waitpid(pid, &status, 0) < 0)
 126                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(errno));
 127                         else if (!WCOREDUMP(status))
 128                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 129                         else
 130                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 131                 }
 132         }
 133
 134         if (arg_crash_chvt)
 135                 chvt(arg_crash_chvt);
 136
 137         if (arg_crash_shell) {
 138                 struct sigaction sa;
 139                 pid_t pid;
 140
 141                 log_info("Executing crash shell in 10s...");
 142                 sleep(10);
 143
 144                 /* Let the kernel reap children for us */
 145                 zero(sa);
 146                 sa.sa_handler = SIG_IGN;
 147                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 148                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 149
 150                 if ((pid = fork()) < 0)
 151                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 152                 else if (pid == 0) {
 153                         int fd, r;
 154
 155                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 156                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 157                         else if ((r = make_stdio(fd)) < 0)
 158                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 159
 160                         execl("/bin/sh", "/bin/sh", NULL);
 161
 162                         log_error("execl() failed: %s", strerror(errno));
 163                         _exit(1);
 164                 }
 165
 166                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 167         }
 168
 169         log_info("Freezing execution.");
 170         freeze();
 171 }
 172
 173 static void install_crash_handler(void) {
 174         struct sigaction sa;
 175
 176         zero(sa);
 177
 178         sa.sa_handler = crash;
 179         sa.sa_flags = SA_NODEFER;
 180
 181         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 182 }
 183
 184 static int make_null_stdio(void) {
 185         int null_fd, r;
 186
 187         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 188                 log_error("Failed to open /dev/null: %m");
 189                 return -errno;
 190         }
 191
 192         if ((r = make_stdio(null_fd)) < 0)
 193                 log_warning("Failed to dup2() device: %s", strerror(-r));
 194
 195         return r;
 196 }
 197
 198 static int console_setup(bool do_reset) {
 199         int tty_fd, r;
 200
 201         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 202          * and make sure we don't have a controlling tty. */
 203
 204         release_terminal();
 205
 206         if (!do_reset)
 207                 return 0;
 208
 209         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 210                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 211                 return -tty_fd;
 212         }
 213
 214         if ((r = reset_terminal(tty_fd)) < 0)
 215                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 216
 217         close_nointr_nofail(tty_fd);
 218         return r;
 219 }
 220
 221 static int set_default_unit(const char *u) {
 222         char *c;
 223
 224         assert(u);
 225
 226         if (!(c = strdup(u)))
 227                 return -ENOMEM;
 228
 229         free(arg_default_unit);
 230         arg_default_unit = c;
 231         return 0;
 232 }
 233
 234 static int parse_proc_cmdline_word(const char *word) {
 235
 236         static const char * const rlmap[] = {
 237                 "emergency", SPECIAL_EMERGENCY_TARGET,
 238                 "single",    SPECIAL_RESCUE_TARGET,
 239                 "-s",        SPECIAL_RESCUE_TARGET,
 240                 "s",         SPECIAL_RESCUE_TARGET,
 241                 "S",         SPECIAL_RESCUE_TARGET,
 242                 "1",         SPECIAL_RESCUE_TARGET,
 243                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 244                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 245                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 246                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 247         };
 248
 249         assert(word);
 250
 251         if (startswith(word, "systemd.unit="))
 252                 return set_default_unit(word + 13);
 253
 254         else if (startswith(word, "systemd.log_target=")) {
 255
 256                 if (log_set_target_from_string(word + 19) < 0)
 257                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 258
 259         } else if (startswith(word, "systemd.log_level=")) {
 260
 261                 if (log_set_max_level_from_string(word + 18) < 0)
 262                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 263
 264         } else if (startswith(word, "systemd.log_color=")) {
 265
 266                 if (log_show_color_from_string(word + 18) < 0)
 267                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 268
 269         } else if (startswith(word, "systemd.log_location=")) {
 270
 271                 if (log_show_location_from_string(word + 21) < 0)
 272                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 273
 274         } else if (startswith(word, "systemd.dump_core=")) {
 275                 int r;
 276
 277                 if ((r = parse_boolean(word + 18)) < 0)
 278                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 279                 else
 280                         arg_dump_core = r;
 281
 282         } else if (startswith(word, "systemd.crash_shell=")) {
 283                 int r;
 284
 285                 if ((r = parse_boolean(word + 20)) < 0)
 286                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 287                 else
 288                         arg_crash_shell = r;
 289
 290         } else if (startswith(word, "systemd.confirm_spawn=")) {
 291                 int r;
 292
 293                 if ((r = parse_boolean(word + 22)) < 0)
 294                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 295                 else
 296                         arg_confirm_spawn = r;
 297
 298         } else if (startswith(word, "systemd.crash_chvt=")) {
 299                 int k;
 300
 301                 if (safe_atoi(word + 19, &k) < 0)
 302                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 303                 else
 304                         arg_crash_chvt = k;
 305
 306         } else if (startswith(word, "systemd.show_status=")) {
 307                 int r;
 308
 309                 if ((r = parse_boolean(word + 20)) < 0)
 310                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 311                 else
 312                         arg_show_status = r;
 313
 314         } else if (startswith(word, "systemd.sysv_console=")) {
 315                 int r;
 316
 317                 if ((r = parse_boolean(word + 21)) < 0)
 318                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 319                 else
 320                         arg_sysv_console = r;
 321
 322         } else if (startswith(word, "systemd.")) {
 323
 324                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 325
 326                 log_info("Supported kernel switches:\n"
 327                          "systemd.unit=UNIT                        Default unit to start\n"
 328                          "systemd.dump_core=0|1                    Dump core on crash\n"
 329                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 330                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 331                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 332                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 333                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 334                          "systemd.log_target=console|kmsg|syslog|syslog-org-kmsg|null\n"
 335                          "                                         Log target\n"
 336                          "systemd.log_level=LEVEL                  Log level\n"
 337                          "systemd.log_color=0|1                    Highlight important log messages\n"
 338                          "systemd.log_location=0|1                 Include code location in log messages\n");
 339
 340         } else if (startswith(word, "console=")) {
 341                 const char *k;
 342                 size_t l;
 343                 char *w = NULL;
 344
 345                 k = word + 8;
 346                 l = strcspn(k, ",");
 347
 348                 /* Ignore the console setting if set to a VT */
 349                 if (l < 4 ||
 350                     !startswith(k, "tty") ||
 351                     k[3+strspn(k+3, "0123456789")] != 0) {
 352
 353                         if (!(w = strndup(k, l)))
 354                                 return -ENOMEM;
 355                 }
 356
 357                 free(arg_console);
 358                 arg_console = w;
 359
 360         } else if (streq(word, "quiet")) {
 361                 arg_show_status = false;
 362                 arg_sysv_console = false;
 363         } else {
 364                 unsigned i;
 365
 366                 /* SysV compatibility */
 367                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 368                         if (streq(word, rlmap[i]))
 369                                 return set_default_unit(rlmap[i+1]);
 370         }
 371
 372         return 0;
 373 }
 374
 375 static int config_parse_level(
 376                 const char *filename,
 377                 unsigned line,
 378                 const char *section,
 379                 const char *lvalue,
 380                 const char *rvalue,
 381                 void *data,
 382                 void *userdata) {
 383
 384         assert(filename);
 385         assert(lvalue);
 386         assert(rvalue);
 387
 388         log_set_max_level_from_string(rvalue);
 389         return 0;
 390 }
 391
 392 static int config_parse_target(
 393                 const char *filename,
 394                 unsigned line,
 395                 const char *section,
 396                 const char *lvalue,
 397                 const char *rvalue,
 398                 void *data,
 399                 void *userdata) {
 400
 401         assert(filename);
 402         assert(lvalue);
 403         assert(rvalue);
 404
 405         log_set_target_from_string(rvalue);
 406         return 0;
 407 }
 408
 409 static int config_parse_color(
 410                 const char *filename,
 411                 unsigned line,
 412                 const char *section,
 413                 const char *lvalue,
 414                 const char *rvalue,
 415                 void *data,
 416                 void *userdata) {
 417
 418         assert(filename);
 419         assert(lvalue);
 420         assert(rvalue);
 421
 422         log_show_color_from_string(rvalue);
 423         return 0;
 424 }
 425
 426 static int config_parse_location(
 427                 const char *filename,
 428                 unsigned line,
 429                 const char *section,
 430                 const char *lvalue,
 431                 const char *rvalue,
 432                 void *data,
 433                 void *userdata) {
 434
 435         assert(filename);
 436         assert(lvalue);
 437         assert(rvalue);
 438
 439         log_show_location_from_string(rvalue);
 440         return 0;
 441 }
 442
 443 static int config_parse_cpu_affinity(
 444                 const char *filename,
 445                 unsigned line,
 446                 const char *section,
 447                 const char *lvalue,
 448                 const char *rvalue,
 449                 void *data,
 450                 void *userdata) {
 451
 452         char *w;
 453         size_t l;
 454         char *state;
 455         cpu_set_t *c = NULL;
 456         unsigned ncpus = 0;
 457
 458         assert(filename);
 459         assert(lvalue);
 460         assert(rvalue);
 461
 462         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 463                 char *t;
 464                 int r;
 465                 unsigned cpu;
 466
 467                 if (!(t = strndup(w, l)))
 468                         return -ENOMEM;
 469
 470                 r = safe_atou(t, &cpu);
 471                 free(t);
 472
 473                 if (!c)
 474                         if (!(c = cpu_set_malloc(&ncpus)))
 475                                 return -ENOMEM;
 476
 477                 if (r < 0 || cpu >= ncpus) {
 478                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 479                         CPU_FREE(c);
 480                         return -EBADMSG;
 481                 }
 482
 483                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 484         }
 485
 486         if (c) {
 487                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 488                         log_warning("Failed to set CPU affinity: %m");
 489
 490                 CPU_FREE(c);
 491         }
 492
 493         return 0;
 494 }
 495
 496 static int parse_config_file(void) {
 497
 498         const ConfigItem items[] = {
 499                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 500                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 501                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 502                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 503                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 504                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 505                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 506                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 507                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 508                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 509                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 510                 { "SwapAuto",    config_parse_bool,         &arg_swap_auto,     "Manager" },
 511                 { NULL, NULL, NULL, NULL }
 512         };
 513
 514         static const char * const sections[] = {
 515                 "Manager",
 516                 NULL
 517         };
 518
 519         FILE *f;
 520         const char *fn;
 521         int r;
 522
 523         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 524
 525         if (!(f = fopen(fn, "re"))) {
 526                 if (errno == ENOENT)
 527                         return 0;
 528
 529                 log_warning("Failed to open configuration file '%s': %m", fn);
 530                 return 0;
 531         }
 532
 533         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 534                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 535
 536         fclose(f);
 537
 538         return 0;
 539 }
 540
 541 static int parse_proc_cmdline(void) {
 542         char *line;
 543         int r;
 544         char *w;
 545         size_t l;
 546         char *state;
 547
 548         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 549                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 550                 return 0;
 551         }
 552
 553         FOREACH_WORD_QUOTED(w, l, line, state) {
 554                 char *word;
 555
 556                 if (!(word = strndup(w, l))) {
 557                         r = -ENOMEM;
 558                         goto finish;
 559                 }
 560
 561                 r = parse_proc_cmdline_word(word);
 562                 free(word);
 563
 564                 if (r < 0)
 565                         goto finish;
 566         }
 567
 568         r = 0;
 569
 570 finish:
 571         free(line);
 572         return r;
 573 }
 574
 575 static int parse_argv(int argc, char *argv[]) {
 576
 577         enum {
 578                 ARG_LOG_LEVEL = 0x100,
 579                 ARG_LOG_TARGET,
 580                 ARG_LOG_COLOR,
 581                 ARG_LOG_LOCATION,
 582                 ARG_UNIT,
 583                 ARG_SYSTEM,
 584                 ARG_SESSION,
 585                 ARG_TEST,
 586                 ARG_DUMP_CONFIGURATION_ITEMS,
 587                 ARG_DUMP_CORE,
 588                 ARG_CRASH_SHELL,
 589                 ARG_CONFIRM_SPAWN,
 590                 ARG_SHOW_STATUS,
 591                 ARG_SYSV_CONSOLE,
 592                 ARG_DESERIALIZE,
 593                 ARG_INTROSPECT
 594         };
 595
 596         static const struct option options[] = {
 597                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 598                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 599                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 600                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 601                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 602                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 603                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 604                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 605                 { "help",                     no_argument,       NULL, 'h'                          },
 606                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 607                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 608                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 609                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 610                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 611                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 612                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 613                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 614                 { NULL,                       0,                 NULL, 0                            }
 615         };
 616
 617         int c, r;
 618
 619         assert(argc >= 1);
 620         assert(argv);
 621
 622         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 623
 624                 switch (c) {
 625
 626                 case ARG_LOG_LEVEL:
 627                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 628                                 log_error("Failed to parse log level %s.", optarg);
 629                                 return r;
 630                         }
 631
 632                         break;
 633
 634                 case ARG_LOG_TARGET:
 635
 636                         if ((r = log_set_target_from_string(optarg)) < 0) {
 637                                 log_error("Failed to parse log target %s.", optarg);
 638                                 return r;
 639                         }
 640
 641                         break;
 642
 643                 case ARG_LOG_COLOR:
 644
 645                         if (optarg) {
 646                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 647                                         log_error("Failed to parse log color setting %s.", optarg);
 648                                         return r;
 649                                 }
 650                         } else
 651                                 log_show_color(true);
 652
 653                         break;
 654
 655                 case ARG_LOG_LOCATION:
 656
 657                         if (optarg) {
 658                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 659                                         log_error("Failed to parse log location setting %s.", optarg);
 660                                         return r;
 661                                 }
 662                         } else
 663                                 log_show_location(true);
 664
 665                         break;
 666
 667                 case ARG_UNIT:
 668
 669                         if ((r = set_default_unit(optarg)) < 0) {
 670                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 671                                 return r;
 672                         }
 673
 674                         break;
 675
 676                 case ARG_SYSTEM:
 677                         arg_running_as = MANAGER_SYSTEM;
 678                         break;
 679
 680                 case ARG_SESSION:
 681                         arg_running_as = MANAGER_SESSION;
 682                         break;
 683
 684                 case ARG_TEST:
 685                         arg_action = ACTION_TEST;
 686                         break;
 687
 688                 case ARG_DUMP_CONFIGURATION_ITEMS:
 689                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 690                         break;
 691
 692                 case ARG_DUMP_CORE:
 693                         arg_dump_core = true;
 694                         break;
 695
 696                 case ARG_CRASH_SHELL:
 697                         arg_crash_shell = true;
 698                         break;
 699
 700                 case ARG_CONFIRM_SPAWN:
 701                         arg_confirm_spawn = true;
 702                         break;
 703
 704                 case ARG_SHOW_STATUS:
 705
 706                         if (optarg) {
 707                                 if ((r = parse_boolean(optarg)) < 0) {
 708                                         log_error("Failed to show status boolean %s.", optarg);
 709                                         return r;
 710                                 }
 711                                 arg_show_status = r;
 712                         } else
 713                                 arg_show_status = true;
 714                         break;
 715
 716                 case ARG_SYSV_CONSOLE:
 717
 718                         if (optarg) {
 719                                 if ((r = parse_boolean(optarg)) < 0) {
 720                                         log_error("Failed to SysV console boolean %s.", optarg);
 721                                         return r;
 722                                 }
 723                                 arg_sysv_console = r;
 724                         } else
 725                                 arg_sysv_console = true;
 726                         break;
 727
 728                 case ARG_DESERIALIZE: {
 729                         int fd;
 730                         FILE *f;
 731
 732                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 733                                 log_error("Failed to parse deserialize option %s.", optarg);
 734                                 return r;
 735                         }
 736
 737                         if (!(f = fdopen(fd, "r"))) {
 738                                 log_error("Failed to open serialization fd: %m");
 739                                 return r;
 740                         }
 741
 742                         if (serialization)
 743                                 fclose(serialization);
 744
 745                         serialization = f;
 746
 747                         break;
 748                 }
 749
 750                 case ARG_INTROSPECT: {
 751                         const char * const * i = NULL;
 752
 753                         for (i = bus_interface_table; *i; i += 2)
 754                                 if (!optarg || streq(i[0], optarg)) {
 755                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 756                                               "<node>\n", stdout);
 757                                         fputs(i[1], stdout);
 758                                         fputs("</node>\n", stdout);
 759
 760                                         if (optarg)
 761                                                 break;
 762                                 }
 763
 764                         if (!i[0] && optarg)
 765                                 log_error("Unknown interface %s.", optarg);
 766
 767                         arg_action = ACTION_DONE;
 768                         break;
 769                 }
 770
 771                 case 'h':
 772                         arg_action = ACTION_HELP;
 773                         break;
 774
 775                 case 'D':
 776                         log_set_max_level(LOG_DEBUG);
 777                         break;
 778
 779                 case '?':
 780                         return -EINVAL;
 781
 782                 default:
 783                         log_error("Unknown option code %c", c);
 784                         return -EINVAL;
 785                 }
 786
 787         /* PID 1 will get the kernel arguments as parameters, which we
 788          * ignore and unconditionally read from
 789          * /proc/cmdline. However, we need to ignore those arguments
 790          * here. */
 791         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 792                 log_error("Excess arguments.");
 793                 return -EINVAL;
 794         }
 795
 796         return 0;
 797 }
 798
 799 static int help(void) {
 800
 801         printf("%s [OPTIONS...]\n\n"
 802                "Starts up and maintains the system or a session.\n\n"
 803                "  -h --help                      Show this help\n"
 804                "     --test                      Determine startup sequence, dump it and exit\n"
 805                "     --dump-configuration-items  Dump understood unit configuration items\n"
 806                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 807                "     --unit=UNIT                 Set default unit\n"
 808                "     --system                    Run a system instance, even if PID != 1\n"
 809                "     --session                   Run a session instance\n"
 810                "     --dump-core                 Dump core on crash\n"
 811                "     --crash-shell               Run shell on crash\n"
 812                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 813                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 814                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 815                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 816                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 817                "     --log-color[=0|1]           Highlight important log messages\n"
 818                "     --log-location[=0|1]        Include code location in log messages\n",
 819                program_invocation_short_name);
 820
 821         return 0;
 822 }
 823
 824 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 825         FILE *f = NULL;
 826         FDSet *fds = NULL;
 827         int r;
 828
 829         assert(m);
 830         assert(_f);
 831         assert(_fds);
 832
 833         if ((r = manager_open_serialization(m, &f)) < 0) {
 834                 log_error("Failed to create serialization faile: %s", strerror(-r));
 835                 goto fail;
 836         }
 837
 838         if (!(fds = fdset_new())) {
 839                 r = -ENOMEM;
 840                 log_error("Failed to allocate fd set: %s", strerror(-r));
 841                 goto fail;
 842         }
 843
 844         if ((r = manager_serialize(m, f, fds)) < 0) {
 845                 log_error("Failed to serialize state: %s", strerror(-r));
 846                 goto fail;
 847         }
 848
 849         if (fseeko(f, 0, SEEK_SET) < 0) {
 850                 log_error("Failed to rewind serialization fd: %m");
 851                 goto fail;
 852         }
 853
 854         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 855                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 856                 goto fail;
 857         }
 858
 859         if ((r = fdset_cloexec(fds, false)) < 0) {
 860                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 861                 goto fail;
 862         }
 863
 864         *_f = f;
 865         *_fds = fds;
 866
 867         return 0;
 868
 869 fail:
 870         fdset_free(fds);
 871
 872         if (f)
 873                 fclose(f);
 874
 875         return r;
 876 }
 877
 878 int main(int argc, char *argv[]) {
 879         Manager *m = NULL;
 880         int r, retval = EXIT_FAILURE;
 881         FDSet *fds = NULL;
 882         bool reexecute = false;
 883
 884         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 885                 /* This is compatbility support for SysV, where
 886                  * calling init as a user is identical to telinit. */
 887
 888                 errno = -ENOENT;
 889                 execv(SYSTEMCTL_BINARY_PATH, argv);
 890                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 891                 return 1;
 892         }
 893
 894         log_show_color(isatty(STDERR_FILENO) > 0);
 895         log_show_location(false);
 896         log_set_max_level(LOG_INFO);
 897
 898         if (getpid() == 1) {
 899                 arg_running_as = MANAGER_SYSTEM;
 900                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 901
 902                 if (label_init() < 0)
 903                         goto finish;
 904         } else {
 905                 arg_running_as = MANAGER_SESSION;
 906                 log_set_target(LOG_TARGET_CONSOLE);
 907         }
 908
 909         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 910                 goto finish;
 911
 912         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 913          * /proc/$PID/fd is available. */
 914         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 915                 if (mount_setup() < 0)
 916                         goto finish;
 917
 918         /* Reset all signal handlers. */
 919         assert_se(reset_all_signal_handlers() == 0);
 920
 921         /* If we are init, we can block sigkill. Yay. */
 922         ignore_signals(SIGNALS_IGNORE, -1);
 923
 924         if (parse_config_file() < 0)
 925                 goto finish;
 926
 927         if (arg_running_as == MANAGER_SYSTEM)
 928                 if (parse_proc_cmdline() < 0)
 929                         goto finish;
 930
 931         log_parse_environment();
 932
 933         if (parse_argv(argc, argv) < 0)
 934                 goto finish;
 935
 936         if (arg_action == ACTION_HELP) {
 937                 retval = help();
 938                 goto finish;
 939         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 940                 unit_dump_config_items(stdout);
 941                 retval = EXIT_SUCCESS;
 942                 goto finish;
 943         } else if (arg_action == ACTION_DONE) {
 944                 retval = EXIT_SUCCESS;
 945                 goto finish;
 946         }
 947
 948         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 949
 950         /* Remember open file descriptors for later deserialization */
 951         if (serialization) {
 952                 if ((r = fdset_new_fill(&fds)) < 0) {
 953                         log_error("Failed to allocate fd set: %s", strerror(-r));
 954                         goto finish;
 955                 }
 956
 957                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 958         } else
 959                 close_all_fds(NULL, 0);
 960
 961         /* Set up PATH unless it is already set */
 962         setenv("PATH",
 963                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 964                arg_running_as == MANAGER_SYSTEM);
 965
 966         /* Move out of the way, so that we won't block unmounts */
 967         assert_se(chdir("/")  == 0);
 968
 969         if (arg_running_as == MANAGER_SYSTEM) {
 970                 /* Become a session leader if we aren't one yet. */
 971                 setsid();
 972
 973                 /* Disable the umask logic */
 974                 umask(0);
 975         }
 976
 977         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 978         dbus_connection_set_change_sigpipe(FALSE);
 979
 980         /* Reset the console, but only if this is really init and we
 981          * are freshly booted */
 982         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 983                 console_setup(getpid() == 1 && !serialization);
 984                 make_null_stdio();
 985         }
 986
 987         /* Open the logging devices, if possible and necessary */
 988         log_open();
 989
 990         /* Make sure we leave a core dump without panicing the
 991          * kernel. */
 992         if (getpid() == 1)
 993                 install_crash_handler();
 994
 995         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
 996                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
 997
 998         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
 999                 if (arg_show_status)
1000                         status_welcome();
1001
1002                 kmod_setup();
1003                 hostname_setup();
1004                 loopback_setup();
1005         }
1006
1007         if ((r = manager_new(arg_running_as, &m)) < 0) {
1008                 log_error("Failed to allocate manager object: %s", strerror(-r));
1009                 goto finish;
1010         }
1011
1012         m->confirm_spawn = arg_confirm_spawn;
1013         m->show_status = arg_show_status;
1014         m->sysv_console = arg_sysv_console;
1015         m->mount_auto = arg_mount_auto;
1016         m->swap_auto = arg_swap_auto;
1017
1018         if (arg_console)
1019                 manager_set_console(m, arg_console);
1020
1021         if ((r = manager_startup(m, serialization, fds)) < 0)
1022                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1023
1024         if (fds) {
1025                 /* This will close all file descriptors that were opened, but
1026                  * not claimed by any unit. */
1027
1028                 fdset_free(fds);
1029                 fds = NULL;
1030         }
1031
1032         if (serialization) {
1033                 fclose(serialization);
1034                 serialization = NULL;
1035         } else {
1036                 DBusError error;
1037                 Unit *target = NULL;
1038
1039                 dbus_error_init(&error);
1040
1041                 log_debug("Activating default unit: %s", arg_default_unit);
1042
1043                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1044                         log_error("Failed to load default target: %s", bus_error(&error, r));
1045                         dbus_error_free(&error);
1046                 } else if (target->meta.load_state != UNIT_LOADED)
1047                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1048
1049                 if (!target || target->meta.load_state != UNIT_LOADED) {
1050                         log_info("Trying to load rescue target...");
1051
1052                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1053                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1054                                 dbus_error_free(&error);
1055                                 goto finish;
1056                         } else if (target->meta.load_state != UNIT_LOADED) {
1057                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1058                                 goto finish;
1059                         }
1060                 }
1061
1062                 if (arg_action == ACTION_TEST) {
1063                         printf("-> By units:\n");
1064                         manager_dump_units(m, stdout, "\t");
1065                 }
1066
1067                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1068                         log_error("Failed to start default target: %s", bus_error(&error, r));
1069                         dbus_error_free(&error);
1070                         goto finish;
1071                 }
1072
1073                 if (arg_action == ACTION_TEST) {
1074                         printf("-> By jobs:\n");
1075                         manager_dump_jobs(m, stdout, "\t");
1076                         retval = EXIT_SUCCESS;
1077                         goto finish;
1078                 }
1079         }
1080
1081         for (;;) {
1082                 if ((r = manager_loop(m)) < 0) {
1083                         log_error("Failed to run mainloop: %s", strerror(-r));
1084                         goto finish;
1085                 }
1086
1087                 switch (m->exit_code) {
1088
1089                 case MANAGER_EXIT:
1090                         retval = EXIT_SUCCESS;
1091                         log_debug("Exit.");
1092                         goto finish;
1093
1094                 case MANAGER_RELOAD:
1095                         log_info("Reloading.");
1096                         if ((r = manager_reload(m)) < 0)
1097                                 log_error("Failed to reload: %s", strerror(-r));
1098                         break;
1099
1100                 case MANAGER_REEXECUTE:
1101                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1102                                 goto finish;
1103
1104                         reexecute = true;
1105                         log_notice("Reexecuting.");
1106                         goto finish;
1107
1108                 default:
1109                         assert_not_reached("Unknown exit code.");
1110                 }
1111         }
1112
1113 finish:
1114         if (m)
1115                 manager_free(m);
1116
1117         free(arg_default_unit);
1118         free(arg_console);
1119
1120         dbus_shutdown();
1121
1122         label_finish();
1123
1124         if (reexecute) {
1125                 const char *args[15];
1126                 unsigned i = 0;
1127                 char sfd[16];
1128
1129                 assert(serialization);
1130                 assert(fds);
1131
1132                 args[i++] = SYSTEMD_BINARY_PATH;
1133
1134                 args[i++] = "--log-level";
1135                 args[i++] = log_level_to_string(log_get_max_level());
1136
1137                 args[i++] = "--log-target";
1138                 args[i++] = log_target_to_string(log_get_target());
1139
1140                 if (arg_running_as == MANAGER_SYSTEM)
1141                         args[i++] = "--system";
1142                 else
1143                         args[i++] = "--session";
1144
1145                 if (arg_dump_core)
1146                         args[i++] = "--dump-core";
1147
1148                 if (arg_crash_shell)
1149                         args[i++] = "--crash-shell";
1150
1151                 if (arg_confirm_spawn)
1152                         args[i++] = "--confirm-spawn";
1153
1154                 if (arg_show_status)
1155                         args[i++] = "--show-status=1";
1156                 else
1157                         args[i++] = "--show-status=0";
1158
1159                 if (arg_sysv_console)
1160                         args[i++] = "--sysv-console=1";
1161                 else
1162                         args[i++] = "--sysv-console=0";
1163
1164                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1165                 char_array_0(sfd);
1166
1167                 args[i++] = "--deserialize";
1168                 args[i++] = sfd;
1169
1170                 args[i++] = NULL;
1171
1172                 assert(i <= ELEMENTSOF(args));
1173
1174                 execv(args[0], (char* const*) args);
1175
1176                 log_error("Failed to reexecute: %m");
1177         }
1178
1179         if (serialization)
1180                 fclose(serialization);
1181
1182         if (fds)
1183                 fdset_free(fds);
1184
1185         if (getpid() == 1)
1186                 freeze();
1187
1188         return retval;
1189 }