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 #include <sys/prctl.h>
  35
  36 #include "manager.h"
  37 #include "log.h"
  38 #include "mount-setup.h"
  39 #include "hostname-setup.h"
  40 #include "loopback-setup.h"
  41 #include "kmod-setup.h"
  42 #include "locale-setup.h"
  43 #include "selinux-setup.h"
  44 #include "load-fragment.h"
  45 #include "fdset.h"
  46 #include "special.h"
  47 #include "conf-parser.h"
  48 #include "bus-errors.h"
  49 #include "missing.h"
  50 #include "label.h"
  51 #include "build.h"
  52 #include "strv.h"
  53
  54 static enum {
  55         ACTION_RUN,
  56         ACTION_HELP,
  57         ACTION_TEST,
  58         ACTION_DUMP_CONFIGURATION_ITEMS,
  59         ACTION_DONE
  60 } arg_action = ACTION_RUN;
  61
  62 static char *arg_default_unit = NULL;
  63 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  64
  65 static bool arg_dump_core = true;
  66 static bool arg_crash_shell = false;
  67 static int arg_crash_chvt = -1;
  68 static bool arg_confirm_spawn = false;
  69 static bool arg_show_status = true;
  70 #ifdef HAVE_SYSV_COMPAT
  71 static bool arg_sysv_console = true;
  72 #endif
  73 static bool arg_mount_auto = true;
  74 static bool arg_swap_auto = true;
  75 static char *arg_console = NULL;
  76 static char **arg_default_controllers = NULL;
  77
  78 static FILE* serialization = NULL;
  79
  80 static void nop_handler(int sig) {
  81 }
  82
  83 _noreturn_ static void crash(int sig) {
  84
  85         if (!arg_dump_core)
  86                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  87         else {
  88                 struct sigaction sa;
  89                 pid_t pid;
  90
  91                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  92                 zero(sa);
  93                 sa.sa_handler = nop_handler;
  94                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  95                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  96
  97                 if ((pid = fork()) < 0)
  98                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  99
 100                 else if (pid == 0) {
 101                         struct rlimit rl;
 102
 103                         /* Enable default signal handler for core dump */
 104                         zero(sa);
 105                         sa.sa_handler = SIG_DFL;
 106                         assert_se(sigaction(sig, &sa, NULL) == 0);
 107
 108                         /* Don't limit the core dump size */
 109                         zero(rl);
 110                         rl.rlim_cur = RLIM_INFINITY;
 111                         rl.rlim_max = RLIM_INFINITY;
 112                         setrlimit(RLIMIT_CORE, &rl);
 113
 114                         /* Just to be sure... */
 115                         assert_se(chdir("/") == 0);
 116
 117                         /* Raise the signal again */
 118                         raise(sig);
 119
 120                         assert_not_reached("We shouldn't be here...");
 121                         _exit(1);
 122
 123                 } else {
 124                         siginfo_t status;
 125                         int r;
 126
 127                         /* Order things nicely. */
 128                         if ((r = wait_for_terminate(pid, &status)) < 0)
 129                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
 130                         else if (status.si_code != CLD_DUMPED)
 131                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 132                         else
 133                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 134                 }
 135         }
 136
 137         if (arg_crash_chvt)
 138                 chvt(arg_crash_chvt);
 139
 140         if (arg_crash_shell) {
 141                 struct sigaction sa;
 142                 pid_t pid;
 143
 144                 log_info("Executing crash shell in 10s...");
 145                 sleep(10);
 146
 147                 /* Let the kernel reap children for us */
 148                 zero(sa);
 149                 sa.sa_handler = SIG_IGN;
 150                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 151                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 152
 153                 if ((pid = fork()) < 0)
 154                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 155                 else if (pid == 0) {
 156                         int fd, r;
 157
 158                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 159                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 160                         else if ((r = make_stdio(fd)) < 0)
 161                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 162
 163                         execl("/bin/sh", "/bin/sh", NULL);
 164
 165                         log_error("execl() failed: %s", strerror(errno));
 166                         _exit(1);
 167                 }
 168
 169                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 170         }
 171
 172         log_info("Freezing execution.");
 173         freeze();
 174 }
 175
 176 static void install_crash_handler(void) {
 177         struct sigaction sa;
 178
 179         zero(sa);
 180
 181         sa.sa_handler = crash;
 182         sa.sa_flags = SA_NODEFER;
 183
 184         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 185 }
 186
 187 static int console_setup(bool do_reset) {
 188         int tty_fd, r;
 189
 190         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 191          * and make sure we don't have a controlling tty. */
 192
 193         release_terminal();
 194
 195         if (!do_reset)
 196                 return 0;
 197
 198         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 199                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 200                 return -tty_fd;
 201         }
 202
 203         if ((r = reset_terminal(tty_fd)) < 0)
 204                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 205
 206         close_nointr_nofail(tty_fd);
 207         return r;
 208 }
 209
 210 static int set_default_unit(const char *u) {
 211         char *c;
 212
 213         assert(u);
 214
 215         if (!(c = strdup(u)))
 216                 return -ENOMEM;
 217
 218         free(arg_default_unit);
 219         arg_default_unit = c;
 220         return 0;
 221 }
 222
 223 static int parse_proc_cmdline_word(const char *word) {
 224
 225         static const char * const rlmap[] = {
 226                 "emergency", SPECIAL_EMERGENCY_TARGET,
 227                 "single",    SPECIAL_RESCUE_TARGET,
 228                 "-s",        SPECIAL_RESCUE_TARGET,
 229                 "s",         SPECIAL_RESCUE_TARGET,
 230                 "S",         SPECIAL_RESCUE_TARGET,
 231                 "1",         SPECIAL_RESCUE_TARGET,
 232                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 233                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 234                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 235                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 236         };
 237
 238         assert(word);
 239
 240         if (startswith(word, "systemd.unit="))
 241                 return set_default_unit(word + 13);
 242
 243         else if (startswith(word, "systemd.log_target=")) {
 244
 245                 if (log_set_target_from_string(word + 19) < 0)
 246                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 247
 248         } else if (startswith(word, "systemd.log_level=")) {
 249
 250                 if (log_set_max_level_from_string(word + 18) < 0)
 251                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 252
 253         } else if (startswith(word, "systemd.log_color=")) {
 254
 255                 if (log_show_color_from_string(word + 18) < 0)
 256                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 257
 258         } else if (startswith(word, "systemd.log_location=")) {
 259
 260                 if (log_show_location_from_string(word + 21) < 0)
 261                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 262
 263         } else if (startswith(word, "systemd.dump_core=")) {
 264                 int r;
 265
 266                 if ((r = parse_boolean(word + 18)) < 0)
 267                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 268                 else
 269                         arg_dump_core = r;
 270
 271         } else if (startswith(word, "systemd.crash_shell=")) {
 272                 int r;
 273
 274                 if ((r = parse_boolean(word + 20)) < 0)
 275                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 276                 else
 277                         arg_crash_shell = r;
 278
 279         } else if (startswith(word, "systemd.confirm_spawn=")) {
 280                 int r;
 281
 282                 if ((r = parse_boolean(word + 22)) < 0)
 283                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 284                 else
 285                         arg_confirm_spawn = r;
 286
 287         } else if (startswith(word, "systemd.crash_chvt=")) {
 288                 int k;
 289
 290                 if (safe_atoi(word + 19, &k) < 0)
 291                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 292                 else
 293                         arg_crash_chvt = k;
 294
 295         } else if (startswith(word, "systemd.show_status=")) {
 296                 int r;
 297
 298                 if ((r = parse_boolean(word + 20)) < 0)
 299                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 300                 else
 301                         arg_show_status = r;
 302 #ifdef HAVE_SYSV_COMPAT
 303         } else if (startswith(word, "systemd.sysv_console=")) {
 304                 int r;
 305
 306                 if ((r = parse_boolean(word + 21)) < 0)
 307                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 308                 else
 309                         arg_sysv_console = r;
 310 #endif
 311
 312         } else if (startswith(word, "systemd.")) {
 313
 314                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 315
 316                 log_info("Supported kernel switches:\n"
 317                          "systemd.unit=UNIT                        Default unit to start\n"
 318                          "systemd.dump_core=0|1                    Dump core on crash\n"
 319                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 320                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 321                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 322                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 323 #ifdef HAVE_SYSV_COMPAT
 324                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 325 #endif
 326                          "systemd.log_target=console|kmsg|syslog|syslog-or-kmsg|null\n"
 327                          "                                         Log target\n"
 328                          "systemd.log_level=LEVEL                  Log level\n"
 329                          "systemd.log_color=0|1                    Highlight important log messages\n"
 330                          "systemd.log_location=0|1                 Include code location in log messages\n");
 331
 332         } else if (startswith(word, "console=")) {
 333                 const char *k;
 334                 size_t l;
 335                 char *w = NULL;
 336
 337                 k = word + 8;
 338                 l = strcspn(k, ",");
 339
 340                 /* Ignore the console setting if set to a VT */
 341                 if (l < 4 ||
 342                     !startswith(k, "tty") ||
 343                     k[3+strspn(k+3, "0123456789")] != 0) {
 344
 345                         if (!(w = strndup(k, l)))
 346                                 return -ENOMEM;
 347                 }
 348
 349                 free(arg_console);
 350                 arg_console = w;
 351
 352         } else if (streq(word, "quiet")) {
 353                 arg_show_status = false;
 354 #ifdef HAVE_SYSV_COMPAT
 355                 arg_sysv_console = false;
 356 #endif
 357         } else {
 358                 unsigned i;
 359
 360                 /* SysV compatibility */
 361                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 362                         if (streq(word, rlmap[i]))
 363                                 return set_default_unit(rlmap[i+1]);
 364         }
 365
 366         return 0;
 367 }
 368
 369 static int config_parse_level(
 370                 const char *filename,
 371                 unsigned line,
 372                 const char *section,
 373                 const char *lvalue,
 374                 const char *rvalue,
 375                 void *data,
 376                 void *userdata) {
 377
 378         assert(filename);
 379         assert(lvalue);
 380         assert(rvalue);
 381
 382         log_set_max_level_from_string(rvalue);
 383         return 0;
 384 }
 385
 386 static int config_parse_target(
 387                 const char *filename,
 388                 unsigned line,
 389                 const char *section,
 390                 const char *lvalue,
 391                 const char *rvalue,
 392                 void *data,
 393                 void *userdata) {
 394
 395         assert(filename);
 396         assert(lvalue);
 397         assert(rvalue);
 398
 399         log_set_target_from_string(rvalue);
 400         return 0;
 401 }
 402
 403 static int config_parse_color(
 404                 const char *filename,
 405                 unsigned line,
 406                 const char *section,
 407                 const char *lvalue,
 408                 const char *rvalue,
 409                 void *data,
 410                 void *userdata) {
 411
 412         assert(filename);
 413         assert(lvalue);
 414         assert(rvalue);
 415
 416         log_show_color_from_string(rvalue);
 417         return 0;
 418 }
 419
 420 static int config_parse_location(
 421                 const char *filename,
 422                 unsigned line,
 423                 const char *section,
 424                 const char *lvalue,
 425                 const char *rvalue,
 426                 void *data,
 427                 void *userdata) {
 428
 429         assert(filename);
 430         assert(lvalue);
 431         assert(rvalue);
 432
 433         log_show_location_from_string(rvalue);
 434         return 0;
 435 }
 436
 437 static int config_parse_cpu_affinity(
 438                 const char *filename,
 439                 unsigned line,
 440                 const char *section,
 441                 const char *lvalue,
 442                 const char *rvalue,
 443                 void *data,
 444                 void *userdata) {
 445
 446         char *w;
 447         size_t l;
 448         char *state;
 449         cpu_set_t *c = NULL;
 450         unsigned ncpus = 0;
 451
 452         assert(filename);
 453         assert(lvalue);
 454         assert(rvalue);
 455
 456         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 457                 char *t;
 458                 int r;
 459                 unsigned cpu;
 460
 461                 if (!(t = strndup(w, l)))
 462                         return -ENOMEM;
 463
 464                 r = safe_atou(t, &cpu);
 465                 free(t);
 466
 467                 if (!c)
 468                         if (!(c = cpu_set_malloc(&ncpus)))
 469                                 return -ENOMEM;
 470
 471                 if (r < 0 || cpu >= ncpus) {
 472                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 473                         CPU_FREE(c);
 474                         return -EBADMSG;
 475                 }
 476
 477                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 478         }
 479
 480         if (c) {
 481                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 482                         log_warning("Failed to set CPU affinity: %m");
 483
 484                 CPU_FREE(c);
 485         }
 486
 487         return 0;
 488 }
 489
 490 static int parse_config_file(void) {
 491
 492         const ConfigItem items[] = {
 493                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 494                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 495                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 496                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 497                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 498                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 499                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 500 #ifdef HAVE_SYSV_COMPAT
 501                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 502 #endif
 503                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 504                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 505                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 506                 { "SwapAuto",    config_parse_bool,         &arg_swap_auto,     "Manager" },
 507                 { "DefaultControllers", config_parse_strv,  &arg_default_controllers, "Manager" },
 508                 { NULL, NULL, NULL, NULL }
 509         };
 510
 511         static const char * const sections[] = {
 512                 "Manager",
 513                 NULL
 514         };
 515
 516         FILE *f;
 517         const char *fn;
 518         int r;
 519
 520         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE;
 521
 522         if (!(f = fopen(fn, "re"))) {
 523                 if (errno == ENOENT)
 524                         return 0;
 525
 526                 log_warning("Failed to open configuration file '%s': %m", fn);
 527                 return 0;
 528         }
 529
 530         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 531                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 532
 533         fclose(f);
 534
 535         return 0;
 536 }
 537
 538 static int parse_proc_cmdline(void) {
 539         char *line, *w, *state;
 540         int r;
 541         size_t l;
 542
 543         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 544                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 545                 return 0;
 546         }
 547
 548         FOREACH_WORD_QUOTED(w, l, line, state) {
 549                 char *word;
 550
 551                 if (!(word = strndup(w, l))) {
 552                         r = -ENOMEM;
 553                         goto finish;
 554                 }
 555
 556                 r = parse_proc_cmdline_word(word);
 557                 free(word);
 558
 559                 if (r < 0)
 560                         goto finish;
 561         }
 562
 563         r = 0;
 564
 565 finish:
 566         free(line);
 567         return r;
 568 }
 569
 570 static int parse_argv(int argc, char *argv[]) {
 571
 572         enum {
 573                 ARG_LOG_LEVEL = 0x100,
 574                 ARG_LOG_TARGET,
 575                 ARG_LOG_COLOR,
 576                 ARG_LOG_LOCATION,
 577                 ARG_UNIT,
 578                 ARG_SYSTEM,
 579                 ARG_USER,
 580                 ARG_TEST,
 581                 ARG_DUMP_CONFIGURATION_ITEMS,
 582                 ARG_DUMP_CORE,
 583                 ARG_CRASH_SHELL,
 584                 ARG_CONFIRM_SPAWN,
 585                 ARG_SHOW_STATUS,
 586                 ARG_SYSV_CONSOLE,
 587                 ARG_DESERIALIZE,
 588                 ARG_INTROSPECT
 589         };
 590
 591         static const struct option options[] = {
 592                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 593                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 594                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 595                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 596                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 597                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 598                 { "user",                     no_argument,       NULL, ARG_USER                     },
 599                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 600                 { "help",                     no_argument,       NULL, 'h'                          },
 601                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 602                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 603                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 604                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 605                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 606 #ifdef HAVE_SYSV_COMPAT
 607                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 608 #endif
 609                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 610                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 611                 { NULL,                       0,                 NULL, 0                            }
 612         };
 613
 614         int c, r;
 615
 616         assert(argc >= 1);
 617         assert(argv);
 618
 619         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 620
 621                 switch (c) {
 622
 623                 case ARG_LOG_LEVEL:
 624                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 625                                 log_error("Failed to parse log level %s.", optarg);
 626                                 return r;
 627                         }
 628
 629                         break;
 630
 631                 case ARG_LOG_TARGET:
 632
 633                         if ((r = log_set_target_from_string(optarg)) < 0) {
 634                                 log_error("Failed to parse log target %s.", optarg);
 635                                 return r;
 636                         }
 637
 638                         break;
 639
 640                 case ARG_LOG_COLOR:
 641
 642                         if (optarg) {
 643                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 644                                         log_error("Failed to parse log color setting %s.", optarg);
 645                                         return r;
 646                                 }
 647                         } else
 648                                 log_show_color(true);
 649
 650                         break;
 651
 652                 case ARG_LOG_LOCATION:
 653
 654                         if (optarg) {
 655                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 656                                         log_error("Failed to parse log location setting %s.", optarg);
 657                                         return r;
 658                                 }
 659                         } else
 660                                 log_show_location(true);
 661
 662                         break;
 663
 664                 case ARG_UNIT:
 665
 666                         if ((r = set_default_unit(optarg)) < 0) {
 667                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 668                                 return r;
 669                         }
 670
 671                         break;
 672
 673                 case ARG_SYSTEM:
 674                         arg_running_as = MANAGER_SYSTEM;
 675                         break;
 676
 677                 case ARG_USER:
 678                         arg_running_as = MANAGER_USER;
 679                         break;
 680
 681                 case ARG_TEST:
 682                         arg_action = ACTION_TEST;
 683                         break;
 684
 685                 case ARG_DUMP_CONFIGURATION_ITEMS:
 686                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 687                         break;
 688
 689                 case ARG_DUMP_CORE:
 690                         arg_dump_core = true;
 691                         break;
 692
 693                 case ARG_CRASH_SHELL:
 694                         arg_crash_shell = true;
 695                         break;
 696
 697                 case ARG_CONFIRM_SPAWN:
 698                         arg_confirm_spawn = true;
 699                         break;
 700
 701                 case ARG_SHOW_STATUS:
 702
 703                         if (optarg) {
 704                                 if ((r = parse_boolean(optarg)) < 0) {
 705                                         log_error("Failed to show status boolean %s.", optarg);
 706                                         return r;
 707                                 }
 708                                 arg_show_status = r;
 709                         } else
 710                                 arg_show_status = true;
 711                         break;
 712 #ifdef HAVE_SYSV_COMPAT
 713                 case ARG_SYSV_CONSOLE:
 714
 715                         if (optarg) {
 716                                 if ((r = parse_boolean(optarg)) < 0) {
 717                                         log_error("Failed to SysV console boolean %s.", optarg);
 718                                         return r;
 719                                 }
 720                                 arg_sysv_console = r;
 721                         } else
 722                                 arg_sysv_console = true;
 723                         break;
 724 #endif
 725
 726                 case ARG_DESERIALIZE: {
 727                         int fd;
 728                         FILE *f;
 729
 730                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 731                                 log_error("Failed to parse deserialize option %s.", optarg);
 732                                 return r;
 733                         }
 734
 735                         if (!(f = fdopen(fd, "r"))) {
 736                                 log_error("Failed to open serialization fd: %m");
 737                                 return r;
 738                         }
 739
 740                         if (serialization)
 741                                 fclose(serialization);
 742
 743                         serialization = f;
 744
 745                         break;
 746                 }
 747
 748                 case ARG_INTROSPECT: {
 749                         const char * const * i = NULL;
 750
 751                         for (i = bus_interface_table; *i; i += 2)
 752                                 if (!optarg || streq(i[0], optarg)) {
 753                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 754                                               "<node>\n", stdout);
 755                                         fputs(i[1], stdout);
 756                                         fputs("</node>\n", stdout);
 757
 758                                         if (optarg)
 759                                                 break;
 760                                 }
 761
 762                         if (!i[0] && optarg)
 763                                 log_error("Unknown interface %s.", optarg);
 764
 765                         arg_action = ACTION_DONE;
 766                         break;
 767                 }
 768
 769                 case 'h':
 770                         arg_action = ACTION_HELP;
 771                         break;
 772
 773                 case 'D':
 774                         log_set_max_level(LOG_DEBUG);
 775                         break;
 776
 777                 case '?':
 778                         return -EINVAL;
 779
 780                 default:
 781                         log_error("Unknown option code %c", c);
 782                         return -EINVAL;
 783                 }
 784
 785         /* PID 1 will get the kernel arguments as parameters, which we
 786          * ignore and unconditionally read from
 787          * /proc/cmdline. However, we need to ignore those arguments
 788          * here. */
 789         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 790                 log_error("Excess arguments.");
 791                 return -EINVAL;
 792         }
 793
 794         return 0;
 795 }
 796
 797 static int help(void) {
 798
 799         printf("%s [OPTIONS...]\n\n"
 800                "Starts up and maintains the system or user services.\n\n"
 801                "  -h --help                      Show this help\n"
 802                "     --test                      Determine startup sequence, dump it and exit\n"
 803                "     --dump-configuration-items  Dump understood unit configuration items\n"
 804                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 805                "     --unit=UNIT                 Set default unit\n"
 806                "     --system                    Run a system instance, even if PID != 1\n"
 807                "     --user                      Run a user instance\n"
 808                "     --dump-core                 Dump core on crash\n"
 809                "     --crash-shell               Run shell on crash\n"
 810                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 811                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 812 #ifdef HAVE_SYSV_COMPAT
 813                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 814 #endif
 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 static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
 879         const char *e;
 880         unsigned long long a, b;
 881
 882         assert(t);
 883
 884         if (!(e = getenv("RD_TIMESTAMP")))
 885                 return NULL;
 886
 887         if (sscanf(e, "%llu %llu", &a, &b) != 2)
 888                 return NULL;
 889
 890         t->realtime = (usec_t) a;
 891         t->monotonic = (usec_t) b;
 892
 893         return t;
 894 }
 895
 896 static void test_mtab(void) {
 897         char *p;
 898
 899         if (readlink_malloc("/etc/mtab", &p) >= 0) {
 900                 bool b;
 901
 902                 b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");
 903                 free(p);
 904
 905                 if (b)
 906                         return;
 907         }
 908
 909         log_error("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
 910                   "This is not supported anymore. "
 911                   "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
 912 }
 913
 914 int main(int argc, char *argv[]) {
 915         Manager *m = NULL;
 916         int r, retval = EXIT_FAILURE;
 917         FDSet *fds = NULL;
 918         bool reexecute = false;
 919         const char *shutdown_verb = NULL;
 920         dual_timestamp initrd_timestamp = { 0ULL, 0ULL };
 921         char systemd[] = "systemd";
 922
 923         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 924                 /* This is compatbility support for SysV, where
 925                  * calling init as a user is identical to telinit. */
 926
 927                 errno = -ENOENT;
 928                 execv(SYSTEMCTL_BINARY_PATH, argv);
 929                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 930                 return 1;
 931         }
 932
 933         /* If we get started via the /sbin/init symlink then we are
 934            called 'init'. After a subsequent reexecution we are then
 935            called 'systemd'. That is confusing, hence let's call us
 936            systemd right-away. */
 937
 938         program_invocation_short_name = systemd;
 939         prctl(PR_SET_NAME, systemd);
 940
 941         log_show_color(isatty(STDERR_FILENO) > 0);
 942         log_show_location(false);
 943         log_set_max_level(LOG_INFO);
 944
 945         if (getpid() == 1) {
 946                 arg_running_as = MANAGER_SYSTEM;
 947                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 948
 949                 /* This might actually not return, but cause a
 950                  * reexecution */
 951                 if (selinux_setup(argv) < 0)
 952                         goto finish;
 953
 954                 if (label_init() < 0)
 955                         goto finish;
 956         } else {
 957                 arg_running_as = MANAGER_USER;
 958                 log_set_target(LOG_TARGET_CONSOLE);
 959         }
 960
 961         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 962                 goto finish;
 963
 964         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 965          * /proc/$PID/fd is available. */
 966         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 967                 if (mount_setup() < 0)
 968                         goto finish;
 969
 970         /* Reset all signal handlers. */
 971         assert_se(reset_all_signal_handlers() == 0);
 972
 973         /* If we are init, we can block sigkill. Yay. */
 974         ignore_signals(SIGNALS_IGNORE, -1);
 975
 976         if (parse_config_file() < 0)
 977                 goto finish;
 978
 979         if (arg_running_as == MANAGER_SYSTEM)
 980                 if (parse_proc_cmdline() < 0)
 981                         goto finish;
 982
 983         log_parse_environment();
 984
 985         if (parse_argv(argc, argv) < 0)
 986                 goto finish;
 987
 988         /* If Plymouth is being run make sure we show the status, so
 989          * that there's something nice to see when people press Esc */
 990         if (access("/dev/.systemd/plymouth", F_OK) >= 0)
 991                 arg_show_status = true;
 992
 993         if (arg_action == ACTION_HELP) {
 994                 retval = help();
 995                 goto finish;
 996         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 997                 unit_dump_config_items(stdout);
 998                 retval = EXIT_SUCCESS;
 999                 goto finish;
1000         } else if (arg_action == ACTION_DONE) {
1001                 retval = EXIT_SUCCESS;
1002                 goto finish;
1003         }
1004
1005         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
1006
1007         /* Remember open file descriptors for later deserialization */
1008         if (serialization) {
1009                 if ((r = fdset_new_fill(&fds)) < 0) {
1010                         log_error("Failed to allocate fd set: %s", strerror(-r));
1011                         goto finish;
1012                 }
1013
1014                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
1015         } else
1016                 close_all_fds(NULL, 0);
1017
1018         /* Set up PATH unless it is already set */
1019         setenv("PATH",
1020                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
1021                arg_running_as == MANAGER_SYSTEM);
1022
1023         if (arg_running_as == MANAGER_SYSTEM) {
1024                 /* Parse the data passed to us by the initrd and unset it */
1025                 parse_initrd_timestamp(&initrd_timestamp);
1026                 filter_environ("RD_");
1027
1028                 /* Unset some environment variables passed in from the
1029                  * kernel that don't really make sense for us. */
1030                 unsetenv("HOME");
1031                 unsetenv("TERM");
1032         }
1033
1034         /* Move out of the way, so that we won't block unmounts */
1035         assert_se(chdir("/")  == 0);
1036
1037         if (arg_running_as == MANAGER_SYSTEM) {
1038                 /* Become a session leader if we aren't one yet. */
1039                 setsid();
1040
1041                 /* Disable the umask logic */
1042                 umask(0);
1043         }
1044
1045         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
1046         dbus_connection_set_change_sigpipe(FALSE);
1047
1048         /* Reset the console, but only if this is really init and we
1049          * are freshly booted */
1050         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
1051                 console_setup(getpid() == 1 && !serialization);
1052                 make_null_stdio();
1053         }
1054
1055         /* Open the logging devices, if possible and necessary */
1056         log_open();
1057
1058         /* Make sure we leave a core dump without panicing the
1059          * kernel. */
1060         if (getpid() == 1)
1061                 install_crash_handler();
1062
1063         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1064                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1065
1066         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1067                 locale_setup();
1068
1069                 if (arg_show_status)
1070                         status_welcome();
1071
1072                 kmod_setup();
1073                 hostname_setup();
1074                 loopback_setup();
1075
1076                 mkdir_p("/dev/.systemd/ask-password/", 0755);
1077
1078                 test_mtab();
1079         }
1080
1081         if ((r = manager_new(arg_running_as, &m)) < 0) {
1082                 log_error("Failed to allocate manager object: %s", strerror(-r));
1083                 goto finish;
1084         }
1085
1086         m->confirm_spawn = arg_confirm_spawn;
1087         m->show_status = arg_show_status;
1088 #ifdef HAVE_SYSV_COMPAT
1089         m->sysv_console = arg_sysv_console;
1090 #endif
1091         m->mount_auto = arg_mount_auto;
1092         m->swap_auto = arg_swap_auto;
1093
1094         if (dual_timestamp_is_set(&initrd_timestamp))
1095                 m->initrd_timestamp = initrd_timestamp;
1096
1097         if (arg_console)
1098                 manager_set_console(m, arg_console);
1099
1100         if (arg_default_controllers)
1101                 manager_set_default_controllers(m, arg_default_controllers);
1102
1103         if ((r = manager_startup(m, serialization, fds)) < 0)
1104                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1105
1106         if (fds) {
1107                 /* This will close all file descriptors that were opened, but
1108                  * not claimed by any unit. */
1109
1110                 fdset_free(fds);
1111                 fds = NULL;
1112         }
1113
1114         if (serialization) {
1115                 fclose(serialization);
1116                 serialization = NULL;
1117         } else {
1118                 DBusError error;
1119                 Unit *target = NULL;
1120
1121                 dbus_error_init(&error);
1122
1123                 log_debug("Activating default unit: %s", arg_default_unit);
1124
1125                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1126                         log_error("Failed to load default target: %s", bus_error(&error, r));
1127                         dbus_error_free(&error);
1128                 } else if (target->meta.load_state == UNIT_ERROR)
1129                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1130                 else if (target->meta.load_state == UNIT_MASKED)
1131                         log_error("Default target masked.");
1132
1133                 if (!target || target->meta.load_state != UNIT_LOADED) {
1134                         log_info("Trying to load rescue target...");
1135
1136                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1137                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1138                                 dbus_error_free(&error);
1139                                 goto finish;
1140                         } else if (target->meta.load_state == UNIT_ERROR) {
1141                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1142                                 goto finish;
1143                         } else if (target->meta.load_state == UNIT_MASKED) {
1144                                 log_error("Rescue target masked.");
1145                                 goto finish;
1146                         }
1147                 }
1148
1149                 assert(target->meta.load_state == UNIT_LOADED);
1150
1151                 if (arg_action == ACTION_TEST) {
1152                         printf("-> By units:\n");
1153                         manager_dump_units(m, stdout, "\t");
1154                 }
1155
1156                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1157                         log_error("Failed to start default target: %s", bus_error(&error, r));
1158                         dbus_error_free(&error);
1159                         goto finish;
1160                 }
1161
1162                 if (arg_action == ACTION_TEST) {
1163                         printf("-> By jobs:\n");
1164                         manager_dump_jobs(m, stdout, "\t");
1165                         retval = EXIT_SUCCESS;
1166                         goto finish;
1167                 }
1168         }
1169
1170         for (;;) {
1171                 if ((r = manager_loop(m)) < 0) {
1172                         log_error("Failed to run mainloop: %s", strerror(-r));
1173                         goto finish;
1174                 }
1175
1176                 switch (m->exit_code) {
1177
1178                 case MANAGER_EXIT:
1179                         retval = EXIT_SUCCESS;
1180                         log_debug("Exit.");
1181                         goto finish;
1182
1183                 case MANAGER_RELOAD:
1184                         log_info("Reloading.");
1185                         if ((r = manager_reload(m)) < 0)
1186                                 log_error("Failed to reload: %s", strerror(-r));
1187                         break;
1188
1189                 case MANAGER_REEXECUTE:
1190                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1191                                 goto finish;
1192
1193                         reexecute = true;
1194                         log_notice("Reexecuting.");
1195                         goto finish;
1196
1197                 case MANAGER_REBOOT:
1198                 case MANAGER_POWEROFF:
1199                 case MANAGER_HALT:
1200                 case MANAGER_KEXEC: {
1201                         static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1202                                 [MANAGER_REBOOT] = "reboot",
1203                                 [MANAGER_POWEROFF] = "poweroff",
1204                                 [MANAGER_HALT] = "halt",
1205                                 [MANAGER_KEXEC] = "kexec"
1206                         };
1207
1208                         assert_se(shutdown_verb = table[m->exit_code]);
1209
1210                         log_notice("Shutting down.");
1211                         goto finish;
1212                 }
1213
1214                 default:
1215                         assert_not_reached("Unknown exit code.");
1216                 }
1217         }
1218
1219 finish:
1220         if (m)
1221                 manager_free(m);
1222
1223         free(arg_default_unit);
1224         free(arg_console);
1225         strv_free(arg_default_controllers);
1226
1227         dbus_shutdown();
1228
1229         label_finish();
1230
1231         if (reexecute) {
1232                 const char *args[15];
1233                 unsigned i = 0;
1234                 char sfd[16];
1235
1236                 assert(serialization);
1237                 assert(fds);
1238
1239                 args[i++] = SYSTEMD_BINARY_PATH;
1240
1241                 args[i++] = "--log-level";
1242                 args[i++] = log_level_to_string(log_get_max_level());
1243
1244                 args[i++] = "--log-target";
1245                 args[i++] = log_target_to_string(log_get_target());
1246
1247                 if (arg_running_as == MANAGER_SYSTEM)
1248                         args[i++] = "--system";
1249                 else
1250                         args[i++] = "--user";
1251
1252                 if (arg_dump_core)
1253                         args[i++] = "--dump-core";
1254
1255                 if (arg_crash_shell)
1256                         args[i++] = "--crash-shell";
1257
1258                 if (arg_confirm_spawn)
1259                         args[i++] = "--confirm-spawn";
1260
1261                 if (arg_show_status)
1262                         args[i++] = "--show-status=1";
1263                 else
1264                         args[i++] = "--show-status=0";
1265
1266 #ifdef HAVE_SYSV_COMPAT
1267                 if (arg_sysv_console)
1268                         args[i++] = "--sysv-console=1";
1269                 else
1270                         args[i++] = "--sysv-console=0";
1271 #endif
1272
1273                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1274                 char_array_0(sfd);
1275
1276                 args[i++] = "--deserialize";
1277                 args[i++] = sfd;
1278
1279                 args[i++] = NULL;
1280
1281                 assert(i <= ELEMENTSOF(args));
1282
1283                 execv(args[0], (char* const*) args);
1284
1285                 log_error("Failed to reexecute: %m");
1286         }
1287
1288         if (serialization)
1289                 fclose(serialization);
1290
1291         if (fds)
1292                 fdset_free(fds);
1293
1294         if (shutdown_verb) {
1295                 const char * command_line[] = {
1296                         SYSTEMD_SHUTDOWN_BINARY_PATH,
1297                         shutdown_verb,
1298                         NULL
1299                 };
1300
1301                 execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line);
1302                 log_error("Failed to execute shutdown binary, freezing: %m");
1303         }
1304
1305         if (getpid() == 1)
1306                 freeze();
1307
1308         return retval;
1309 }