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
  53 static enum {
  54         ACTION_RUN,
  55         ACTION_HELP,
  56         ACTION_TEST,
  57         ACTION_DUMP_CONFIGURATION_ITEMS,
  58         ACTION_DONE
  59 } arg_action = ACTION_RUN;
  60
  61 static char *arg_default_unit = NULL;
  62 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  63
  64 static bool arg_dump_core = true;
  65 static bool arg_crash_shell = false;
  66 static int arg_crash_chvt = -1;
  67 static bool arg_confirm_spawn = false;
  68 static bool arg_show_status = true;
  69 #ifdef HAVE_SYSV_COMPAT
  70 static bool arg_sysv_console = true;
  71 #endif
  72 static bool arg_mount_auto = true;
  73 static bool arg_swap_auto = true;
  74 static char *arg_console = NULL;
  75
  76 static FILE* serialization = NULL;
  77
  78 static void nop_handler(int sig) {
  79 }
  80
  81 _noreturn_ static void crash(int sig) {
  82
  83         if (!arg_dump_core)
  84                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  85         else {
  86                 struct sigaction sa;
  87                 pid_t pid;
  88
  89                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  90                 zero(sa);
  91                 sa.sa_handler = nop_handler;
  92                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  93                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  94
  95                 if ((pid = fork()) < 0)
  96                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  97
  98                 else if (pid == 0) {
  99                         struct rlimit rl;
 100
 101                         /* Enable default signal handler for core dump */
 102                         zero(sa);
 103                         sa.sa_handler = SIG_DFL;
 104                         assert_se(sigaction(sig, &sa, NULL) == 0);
 105
 106                         /* Don't limit the core dump size */
 107                         zero(rl);
 108                         rl.rlim_cur = RLIM_INFINITY;
 109                         rl.rlim_max = RLIM_INFINITY;
 110                         setrlimit(RLIMIT_CORE, &rl);
 111
 112                         /* Just to be sure... */
 113                         assert_se(chdir("/") == 0);
 114
 115                         /* Raise the signal again */
 116                         raise(sig);
 117
 118                         assert_not_reached("We shouldn't be here...");
 119                         _exit(1);
 120
 121                 } else {
 122                         siginfo_t status;
 123                         int r;
 124
 125                         /* Order things nicely. */
 126                         if ((r = wait_for_terminate(pid, &status)) < 0)
 127                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
 128                         else if (status.si_code != CLD_DUMPED)
 129                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 130                         else
 131                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 132                 }
 133         }
 134
 135         if (arg_crash_chvt)
 136                 chvt(arg_crash_chvt);
 137
 138         if (arg_crash_shell) {
 139                 struct sigaction sa;
 140                 pid_t pid;
 141
 142                 log_info("Executing crash shell in 10s...");
 143                 sleep(10);
 144
 145                 /* Let the kernel reap children for us */
 146                 zero(sa);
 147                 sa.sa_handler = SIG_IGN;
 148                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 149                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 150
 151                 if ((pid = fork()) < 0)
 152                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 153                 else if (pid == 0) {
 154                         int fd, r;
 155
 156                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 157                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 158                         else if ((r = make_stdio(fd)) < 0)
 159                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 160
 161                         execl("/bin/sh", "/bin/sh", NULL);
 162
 163                         log_error("execl() failed: %s", strerror(errno));
 164                         _exit(1);
 165                 }
 166
 167                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 168         }
 169
 170         log_info("Freezing execution.");
 171         freeze();
 172 }
 173
 174 static void install_crash_handler(void) {
 175         struct sigaction sa;
 176
 177         zero(sa);
 178
 179         sa.sa_handler = crash;
 180         sa.sa_flags = SA_NODEFER;
 181
 182         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 183 }
 184
 185 static int console_setup(bool do_reset) {
 186         int tty_fd, r;
 187
 188         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 189          * and make sure we don't have a controlling tty. */
 190
 191         release_terminal();
 192
 193         if (!do_reset)
 194                 return 0;
 195
 196         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 197                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 198                 return -tty_fd;
 199         }
 200
 201         if ((r = reset_terminal(tty_fd)) < 0)
 202                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 203
 204         close_nointr_nofail(tty_fd);
 205         return r;
 206 }
 207
 208 static int set_default_unit(const char *u) {
 209         char *c;
 210
 211         assert(u);
 212
 213         if (!(c = strdup(u)))
 214                 return -ENOMEM;
 215
 216         free(arg_default_unit);
 217         arg_default_unit = c;
 218         return 0;
 219 }
 220
 221 static int parse_proc_cmdline_word(const char *word) {
 222
 223         static const char * const rlmap[] = {
 224                 "emergency", SPECIAL_EMERGENCY_TARGET,
 225                 "single",    SPECIAL_RESCUE_TARGET,
 226                 "-s",        SPECIAL_RESCUE_TARGET,
 227                 "s",         SPECIAL_RESCUE_TARGET,
 228                 "S",         SPECIAL_RESCUE_TARGET,
 229                 "1",         SPECIAL_RESCUE_TARGET,
 230                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 231                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 232                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 233                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 234         };
 235
 236         assert(word);
 237
 238         if (startswith(word, "systemd.unit="))
 239                 return set_default_unit(word + 13);
 240
 241         else if (startswith(word, "systemd.log_target=")) {
 242
 243                 if (log_set_target_from_string(word + 19) < 0)
 244                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 245
 246         } else if (startswith(word, "systemd.log_level=")) {
 247
 248                 if (log_set_max_level_from_string(word + 18) < 0)
 249                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 250
 251         } else if (startswith(word, "systemd.log_color=")) {
 252
 253                 if (log_show_color_from_string(word + 18) < 0)
 254                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 255
 256         } else if (startswith(word, "systemd.log_location=")) {
 257
 258                 if (log_show_location_from_string(word + 21) < 0)
 259                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 260
 261         } else if (startswith(word, "systemd.dump_core=")) {
 262                 int r;
 263
 264                 if ((r = parse_boolean(word + 18)) < 0)
 265                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 266                 else
 267                         arg_dump_core = r;
 268
 269         } else if (startswith(word, "systemd.crash_shell=")) {
 270                 int r;
 271
 272                 if ((r = parse_boolean(word + 20)) < 0)
 273                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 274                 else
 275                         arg_crash_shell = r;
 276
 277         } else if (startswith(word, "systemd.confirm_spawn=")) {
 278                 int r;
 279
 280                 if ((r = parse_boolean(word + 22)) < 0)
 281                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 282                 else
 283                         arg_confirm_spawn = r;
 284
 285         } else if (startswith(word, "systemd.crash_chvt=")) {
 286                 int k;
 287
 288                 if (safe_atoi(word + 19, &k) < 0)
 289                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 290                 else
 291                         arg_crash_chvt = k;
 292
 293         } else if (startswith(word, "systemd.show_status=")) {
 294                 int r;
 295
 296                 if ((r = parse_boolean(word + 20)) < 0)
 297                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 298                 else
 299                         arg_show_status = r;
 300 #ifdef HAVE_SYSV_COMPAT
 301         } else if (startswith(word, "systemd.sysv_console=")) {
 302                 int r;
 303
 304                 if ((r = parse_boolean(word + 21)) < 0)
 305                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 306                 else
 307                         arg_sysv_console = r;
 308 #endif
 309
 310         } else if (startswith(word, "systemd.")) {
 311
 312                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 313
 314                 log_info("Supported kernel switches:\n"
 315                          "systemd.unit=UNIT                        Default unit to start\n"
 316                          "systemd.dump_core=0|1                    Dump core on crash\n"
 317                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 318                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 319                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 320                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 321 #ifdef HAVE_SYSV_COMPAT
 322                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 323 #endif
 324                          "systemd.log_target=console|kmsg|syslog|syslog-or-kmsg|null\n"
 325                          "                                         Log target\n"
 326                          "systemd.log_level=LEVEL                  Log level\n"
 327                          "systemd.log_color=0|1                    Highlight important log messages\n"
 328                          "systemd.log_location=0|1                 Include code location in log messages\n");
 329
 330         } else if (startswith(word, "console=")) {
 331                 const char *k;
 332                 size_t l;
 333                 char *w = NULL;
 334
 335                 k = word + 8;
 336                 l = strcspn(k, ",");
 337
 338                 /* Ignore the console setting if set to a VT */
 339                 if (l < 4 ||
 340                     !startswith(k, "tty") ||
 341                     k[3+strspn(k+3, "0123456789")] != 0) {
 342
 343                         if (!(w = strndup(k, l)))
 344                                 return -ENOMEM;
 345                 }
 346
 347                 free(arg_console);
 348                 arg_console = w;
 349
 350         } else if (streq(word, "quiet")) {
 351                 arg_show_status = false;
 352 #ifdef HAVE_SYSV_COMPAT
 353                 arg_sysv_console = false;
 354 #endif
 355         } else {
 356                 unsigned i;
 357
 358                 /* SysV compatibility */
 359                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 360                         if (streq(word, rlmap[i]))
 361                                 return set_default_unit(rlmap[i+1]);
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int config_parse_level(
 368                 const char *filename,
 369                 unsigned line,
 370                 const char *section,
 371                 const char *lvalue,
 372                 const char *rvalue,
 373                 void *data,
 374                 void *userdata) {
 375
 376         assert(filename);
 377         assert(lvalue);
 378         assert(rvalue);
 379
 380         log_set_max_level_from_string(rvalue);
 381         return 0;
 382 }
 383
 384 static int config_parse_target(
 385                 const char *filename,
 386                 unsigned line,
 387                 const char *section,
 388                 const char *lvalue,
 389                 const char *rvalue,
 390                 void *data,
 391                 void *userdata) {
 392
 393         assert(filename);
 394         assert(lvalue);
 395         assert(rvalue);
 396
 397         log_set_target_from_string(rvalue);
 398         return 0;
 399 }
 400
 401 static int config_parse_color(
 402                 const char *filename,
 403                 unsigned line,
 404                 const char *section,
 405                 const char *lvalue,
 406                 const char *rvalue,
 407                 void *data,
 408                 void *userdata) {
 409
 410         assert(filename);
 411         assert(lvalue);
 412         assert(rvalue);
 413
 414         log_show_color_from_string(rvalue);
 415         return 0;
 416 }
 417
 418 static int config_parse_location(
 419                 const char *filename,
 420                 unsigned line,
 421                 const char *section,
 422                 const char *lvalue,
 423                 const char *rvalue,
 424                 void *data,
 425                 void *userdata) {
 426
 427         assert(filename);
 428         assert(lvalue);
 429         assert(rvalue);
 430
 431         log_show_location_from_string(rvalue);
 432         return 0;
 433 }
 434
 435 static int config_parse_cpu_affinity(
 436                 const char *filename,
 437                 unsigned line,
 438                 const char *section,
 439                 const char *lvalue,
 440                 const char *rvalue,
 441                 void *data,
 442                 void *userdata) {
 443
 444         char *w;
 445         size_t l;
 446         char *state;
 447         cpu_set_t *c = NULL;
 448         unsigned ncpus = 0;
 449
 450         assert(filename);
 451         assert(lvalue);
 452         assert(rvalue);
 453
 454         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 455                 char *t;
 456                 int r;
 457                 unsigned cpu;
 458
 459                 if (!(t = strndup(w, l)))
 460                         return -ENOMEM;
 461
 462                 r = safe_atou(t, &cpu);
 463                 free(t);
 464
 465                 if (!c)
 466                         if (!(c = cpu_set_malloc(&ncpus)))
 467                                 return -ENOMEM;
 468
 469                 if (r < 0 || cpu >= ncpus) {
 470                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 471                         CPU_FREE(c);
 472                         return -EBADMSG;
 473                 }
 474
 475                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 476         }
 477
 478         if (c) {
 479                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 480                         log_warning("Failed to set CPU affinity: %m");
 481
 482                 CPU_FREE(c);
 483         }
 484
 485         return 0;
 486 }
 487
 488 static int parse_config_file(void) {
 489
 490         const ConfigItem items[] = {
 491                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 492                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 493                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 494                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 495                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 496                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 497                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 498 #ifdef HAVE_SYSV_COMPAT
 499                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 500 #endif
 501                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 502                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 503                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 504                 { "SwapAuto",    config_parse_bool,         &arg_swap_auto,     "Manager" },
 505                 { NULL, NULL, NULL, NULL }
 506         };
 507
 508         static const char * const sections[] = {
 509                 "Manager",
 510                 NULL
 511         };
 512
 513         FILE *f;
 514         const char *fn;
 515         int r;
 516
 517         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 518
 519         if (!(f = fopen(fn, "re"))) {
 520                 if (errno == ENOENT)
 521                         return 0;
 522
 523                 log_warning("Failed to open configuration file '%s': %m", fn);
 524                 return 0;
 525         }
 526
 527         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 528                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 529
 530         fclose(f);
 531
 532         return 0;
 533 }
 534
 535 static int parse_proc_cmdline(void) {
 536         char *line, *w, *state;
 537         int r;
 538         size_t l;
 539
 540         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 541                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 542                 return 0;
 543         }
 544
 545         FOREACH_WORD_QUOTED(w, l, line, state) {
 546                 char *word;
 547
 548                 if (!(word = strndup(w, l))) {
 549                         r = -ENOMEM;
 550                         goto finish;
 551                 }
 552
 553                 r = parse_proc_cmdline_word(word);
 554                 free(word);
 555
 556                 if (r < 0)
 557                         goto finish;
 558         }
 559
 560         r = 0;
 561
 562 finish:
 563         free(line);
 564         return r;
 565 }
 566
 567 static int parse_argv(int argc, char *argv[]) {
 568
 569         enum {
 570                 ARG_LOG_LEVEL = 0x100,
 571                 ARG_LOG_TARGET,
 572                 ARG_LOG_COLOR,
 573                 ARG_LOG_LOCATION,
 574                 ARG_UNIT,
 575                 ARG_SYSTEM,
 576                 ARG_SESSION,
 577                 ARG_TEST,
 578                 ARG_DUMP_CONFIGURATION_ITEMS,
 579                 ARG_DUMP_CORE,
 580                 ARG_CRASH_SHELL,
 581                 ARG_CONFIRM_SPAWN,
 582                 ARG_SHOW_STATUS,
 583                 ARG_SYSV_CONSOLE,
 584                 ARG_DESERIALIZE,
 585                 ARG_INTROSPECT
 586         };
 587
 588         static const struct option options[] = {
 589                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 590                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 591                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 592                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 593                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 594                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 595                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 596                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 597                 { "help",                     no_argument,       NULL, 'h'                          },
 598                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 599                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 600                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 601                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 602                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 603 #ifdef HAVE_SYSV_COMPAT
 604                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 605 #endif
 606                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 607                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 608                 { NULL,                       0,                 NULL, 0                            }
 609         };
 610
 611         int c, r;
 612
 613         assert(argc >= 1);
 614         assert(argv);
 615
 616         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 617
 618                 switch (c) {
 619
 620                 case ARG_LOG_LEVEL:
 621                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 622                                 log_error("Failed to parse log level %s.", optarg);
 623                                 return r;
 624                         }
 625
 626                         break;
 627
 628                 case ARG_LOG_TARGET:
 629
 630                         if ((r = log_set_target_from_string(optarg)) < 0) {
 631                                 log_error("Failed to parse log target %s.", optarg);
 632                                 return r;
 633                         }
 634
 635                         break;
 636
 637                 case ARG_LOG_COLOR:
 638
 639                         if (optarg) {
 640                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 641                                         log_error("Failed to parse log color setting %s.", optarg);
 642                                         return r;
 643                                 }
 644                         } else
 645                                 log_show_color(true);
 646
 647                         break;
 648
 649                 case ARG_LOG_LOCATION:
 650
 651                         if (optarg) {
 652                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 653                                         log_error("Failed to parse log location setting %s.", optarg);
 654                                         return r;
 655                                 }
 656                         } else
 657                                 log_show_location(true);
 658
 659                         break;
 660
 661                 case ARG_UNIT:
 662
 663                         if ((r = set_default_unit(optarg)) < 0) {
 664                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 665                                 return r;
 666                         }
 667
 668                         break;
 669
 670                 case ARG_SYSTEM:
 671                         arg_running_as = MANAGER_SYSTEM;
 672                         break;
 673
 674                 case ARG_SESSION:
 675                         arg_running_as = MANAGER_SESSION;
 676                         break;
 677
 678                 case ARG_TEST:
 679                         arg_action = ACTION_TEST;
 680                         break;
 681
 682                 case ARG_DUMP_CONFIGURATION_ITEMS:
 683                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 684                         break;
 685
 686                 case ARG_DUMP_CORE:
 687                         arg_dump_core = true;
 688                         break;
 689
 690                 case ARG_CRASH_SHELL:
 691                         arg_crash_shell = true;
 692                         break;
 693
 694                 case ARG_CONFIRM_SPAWN:
 695                         arg_confirm_spawn = true;
 696                         break;
 697
 698                 case ARG_SHOW_STATUS:
 699
 700                         if (optarg) {
 701                                 if ((r = parse_boolean(optarg)) < 0) {
 702                                         log_error("Failed to show status boolean %s.", optarg);
 703                                         return r;
 704                                 }
 705                                 arg_show_status = r;
 706                         } else
 707                                 arg_show_status = true;
 708                         break;
 709 #ifdef HAVE_SYSV_COMPAT
 710                 case ARG_SYSV_CONSOLE:
 711
 712                         if (optarg) {
 713                                 if ((r = parse_boolean(optarg)) < 0) {
 714                                         log_error("Failed to SysV console boolean %s.", optarg);
 715                                         return r;
 716                                 }
 717                                 arg_sysv_console = r;
 718                         } else
 719                                 arg_sysv_console = true;
 720                         break;
 721 #endif
 722
 723                 case ARG_DESERIALIZE: {
 724                         int fd;
 725                         FILE *f;
 726
 727                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 728                                 log_error("Failed to parse deserialize option %s.", optarg);
 729                                 return r;
 730                         }
 731
 732                         if (!(f = fdopen(fd, "r"))) {
 733                                 log_error("Failed to open serialization fd: %m");
 734                                 return r;
 735                         }
 736
 737                         if (serialization)
 738                                 fclose(serialization);
 739
 740                         serialization = f;
 741
 742                         break;
 743                 }
 744
 745                 case ARG_INTROSPECT: {
 746                         const char * const * i = NULL;
 747
 748                         for (i = bus_interface_table; *i; i += 2)
 749                                 if (!optarg || streq(i[0], optarg)) {
 750                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 751                                               "<node>\n", stdout);
 752                                         fputs(i[1], stdout);
 753                                         fputs("</node>\n", stdout);
 754
 755                                         if (optarg)
 756                                                 break;
 757                                 }
 758
 759                         if (!i[0] && optarg)
 760                                 log_error("Unknown interface %s.", optarg);
 761
 762                         arg_action = ACTION_DONE;
 763                         break;
 764                 }
 765
 766                 case 'h':
 767                         arg_action = ACTION_HELP;
 768                         break;
 769
 770                 case 'D':
 771                         log_set_max_level(LOG_DEBUG);
 772                         break;
 773
 774                 case '?':
 775                         return -EINVAL;
 776
 777                 default:
 778                         log_error("Unknown option code %c", c);
 779                         return -EINVAL;
 780                 }
 781
 782         /* PID 1 will get the kernel arguments as parameters, which we
 783          * ignore and unconditionally read from
 784          * /proc/cmdline. However, we need to ignore those arguments
 785          * here. */
 786         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 787                 log_error("Excess arguments.");
 788                 return -EINVAL;
 789         }
 790
 791         return 0;
 792 }
 793
 794 static int help(void) {
 795
 796         printf("%s [OPTIONS...]\n\n"
 797                "Starts up and maintains the system or a session.\n\n"
 798                "  -h --help                      Show this help\n"
 799                "     --test                      Determine startup sequence, dump it and exit\n"
 800                "     --dump-configuration-items  Dump understood unit configuration items\n"
 801                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 802                "     --unit=UNIT                 Set default unit\n"
 803                "     --system                    Run a system instance, even if PID != 1\n"
 804                "     --session                   Run a session instance\n"
 805                "     --dump-core                 Dump core on crash\n"
 806                "     --crash-shell               Run shell on crash\n"
 807                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 808                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 809 #ifdef HAVE_SYSV_COMPAT
 810                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 811 #endif
 812                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 813                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 814                "     --log-color[=0|1]           Highlight important log messages\n"
 815                "     --log-location[=0|1]        Include code location in log messages\n",
 816                program_invocation_short_name);
 817
 818         return 0;
 819 }
 820
 821 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 822         FILE *f = NULL;
 823         FDSet *fds = NULL;
 824         int r;
 825
 826         assert(m);
 827         assert(_f);
 828         assert(_fds);
 829
 830         if ((r = manager_open_serialization(m, &f)) < 0) {
 831                 log_error("Failed to create serialization faile: %s", strerror(-r));
 832                 goto fail;
 833         }
 834
 835         if (!(fds = fdset_new())) {
 836                 r = -ENOMEM;
 837                 log_error("Failed to allocate fd set: %s", strerror(-r));
 838                 goto fail;
 839         }
 840
 841         if ((r = manager_serialize(m, f, fds)) < 0) {
 842                 log_error("Failed to serialize state: %s", strerror(-r));
 843                 goto fail;
 844         }
 845
 846         if (fseeko(f, 0, SEEK_SET) < 0) {
 847                 log_error("Failed to rewind serialization fd: %m");
 848                 goto fail;
 849         }
 850
 851         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 852                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 853                 goto fail;
 854         }
 855
 856         if ((r = fdset_cloexec(fds, false)) < 0) {
 857                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 858                 goto fail;
 859         }
 860
 861         *_f = f;
 862         *_fds = fds;
 863
 864         return 0;
 865
 866 fail:
 867         fdset_free(fds);
 868
 869         if (f)
 870                 fclose(f);
 871
 872         return r;
 873 }
 874
 875 static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
 876         const char *e;
 877         unsigned long long a, b;
 878
 879         assert(t);
 880
 881         if (!(e = getenv("RD_TIMESTAMP")))
 882                 return NULL;
 883
 884         if (sscanf(e, "%llu %llu", &a, &b) != 2)
 885                 return NULL;
 886
 887         t->realtime = (usec_t) a;
 888         t->monotonic = (usec_t) b;
 889
 890         return t;
 891 }
 892
 893 static void test_mtab(void) {
 894         char *p;
 895
 896         if (readlink_malloc("/etc/mtab", &p) >= 0) {
 897                 bool b;
 898
 899                 b = streq(p, "/proc/self/mounts");
 900                 free(p);
 901
 902                 if (b)
 903                         return;
 904         }
 905
 906         log_error("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
 907                   "This is not supported anymore. "
 908                   "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
 909 }
 910
 911 int main(int argc, char *argv[]) {
 912         Manager *m = NULL;
 913         int r, retval = EXIT_FAILURE;
 914         FDSet *fds = NULL;
 915         bool reexecute = false;
 916         const char *shutdown_verb = NULL;
 917         dual_timestamp initrd_timestamp = { 0ULL, 0ULL };
 918         char systemd[] = "systemd";
 919
 920         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 921                 /* This is compatbility support for SysV, where
 922                  * calling init as a user is identical to telinit. */
 923
 924                 errno = -ENOENT;
 925                 execv(SYSTEMCTL_BINARY_PATH, argv);
 926                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 927                 return 1;
 928         }
 929
 930         /* If we get started via the /sbin/init symlink then we are
 931            called 'init'. After a subsequent reexecution we are then
 932            called 'systemd'. That is confusing, hence let's call us
 933            systemd right-away. */
 934
 935         program_invocation_short_name = systemd;
 936         prctl(PR_SET_NAME, systemd);
 937
 938         log_show_color(isatty(STDERR_FILENO) > 0);
 939         log_show_location(false);
 940         log_set_max_level(LOG_INFO);
 941
 942         if (getpid() == 1) {
 943                 arg_running_as = MANAGER_SYSTEM;
 944                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 945
 946                 /* This might actually not return, but cause a
 947                  * reexecution */
 948                 if (selinux_setup(argv) < 0)
 949                         goto finish;
 950
 951                 if (label_init() < 0)
 952                         goto finish;
 953         } else {
 954                 arg_running_as = MANAGER_SESSION;
 955                 log_set_target(LOG_TARGET_CONSOLE);
 956         }
 957
 958         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 959                 goto finish;
 960
 961         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 962          * /proc/$PID/fd is available. */
 963         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 964                 if (mount_setup() < 0)
 965                         goto finish;
 966
 967         /* Reset all signal handlers. */
 968         assert_se(reset_all_signal_handlers() == 0);
 969
 970         /* If we are init, we can block sigkill. Yay. */
 971         ignore_signals(SIGNALS_IGNORE, -1);
 972
 973         if (parse_config_file() < 0)
 974                 goto finish;
 975
 976         if (arg_running_as == MANAGER_SYSTEM)
 977                 if (parse_proc_cmdline() < 0)
 978                         goto finish;
 979
 980         log_parse_environment();
 981
 982         if (parse_argv(argc, argv) < 0)
 983                 goto finish;
 984
 985         if (arg_action == ACTION_HELP) {
 986                 retval = help();
 987                 goto finish;
 988         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 989                 unit_dump_config_items(stdout);
 990                 retval = EXIT_SUCCESS;
 991                 goto finish;
 992         } else if (arg_action == ACTION_DONE) {
 993                 retval = EXIT_SUCCESS;
 994                 goto finish;
 995         }
 996
 997         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 998
 999         /* Remember open file descriptors for later deserialization */
1000         if (serialization) {
1001                 if ((r = fdset_new_fill(&fds)) < 0) {
1002                         log_error("Failed to allocate fd set: %s", strerror(-r));
1003                         goto finish;
1004                 }
1005
1006                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
1007         } else
1008                 close_all_fds(NULL, 0);
1009
1010         /* Set up PATH unless it is already set */
1011         setenv("PATH",
1012                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
1013                arg_running_as == MANAGER_SYSTEM);
1014
1015         if (arg_running_as == MANAGER_SYSTEM) {
1016                 /* Parse the data passed to us by the initrd and unset it */
1017                 parse_initrd_timestamp(&initrd_timestamp);
1018                 filter_environ("RD_");
1019
1020                 /* Unset some environment variables passed in from the
1021                  * kernel that don't really make sense for us. */
1022                 unsetenv("HOME");
1023                 unsetenv("TERM");
1024         }
1025
1026         /* Move out of the way, so that we won't block unmounts */
1027         assert_se(chdir("/")  == 0);
1028
1029         if (arg_running_as == MANAGER_SYSTEM) {
1030                 /* Become a session leader if we aren't one yet. */
1031                 setsid();
1032
1033                 /* Disable the umask logic */
1034                 umask(0);
1035         }
1036
1037         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
1038         dbus_connection_set_change_sigpipe(FALSE);
1039
1040         /* Reset the console, but only if this is really init and we
1041          * are freshly booted */
1042         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
1043                 console_setup(getpid() == 1 && !serialization);
1044                 make_null_stdio();
1045         }
1046
1047         /* Open the logging devices, if possible and necessary */
1048         log_open();
1049
1050         /* Make sure we leave a core dump without panicing the
1051          * kernel. */
1052         if (getpid() == 1)
1053                 install_crash_handler();
1054
1055         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1056                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1057
1058         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1059                 locale_setup();
1060
1061                 if (arg_show_status)
1062                         status_welcome();
1063
1064                 kmod_setup();
1065                 hostname_setup();
1066                 loopback_setup();
1067
1068                 mkdir_p("/dev/.systemd/ask-password/", 0755);
1069
1070                 test_mtab();
1071         }
1072
1073         if ((r = manager_new(arg_running_as, &m)) < 0) {
1074                 log_error("Failed to allocate manager object: %s", strerror(-r));
1075                 goto finish;
1076         }
1077
1078         m->confirm_spawn = arg_confirm_spawn;
1079         m->show_status = arg_show_status;
1080 #ifdef HAVE_SYSV_COMPAT
1081         m->sysv_console = arg_sysv_console;
1082 #endif
1083         m->mount_auto = arg_mount_auto;
1084         m->swap_auto = arg_swap_auto;
1085
1086         if (dual_timestamp_is_set(&initrd_timestamp))
1087                 m->initrd_timestamp = initrd_timestamp;
1088
1089         if (arg_console)
1090                 manager_set_console(m, arg_console);
1091
1092         if ((r = manager_startup(m, serialization, fds)) < 0)
1093                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1094
1095         if (fds) {
1096                 /* This will close all file descriptors that were opened, but
1097                  * not claimed by any unit. */
1098
1099                 fdset_free(fds);
1100                 fds = NULL;
1101         }
1102
1103         if (serialization) {
1104                 fclose(serialization);
1105                 serialization = NULL;
1106         } else {
1107                 DBusError error;
1108                 Unit *target = NULL;
1109
1110                 dbus_error_init(&error);
1111
1112                 log_debug("Activating default unit: %s", arg_default_unit);
1113
1114                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1115                         log_error("Failed to load default target: %s", bus_error(&error, r));
1116                         dbus_error_free(&error);
1117                 } else if (target->meta.load_state == UNIT_ERROR)
1118                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1119                 else if (target->meta.load_state == UNIT_MASKED)
1120                         log_error("Default target masked.");
1121
1122                 if (!target || target->meta.load_state != UNIT_LOADED) {
1123                         log_info("Trying to load rescue target...");
1124
1125                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1126                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1127                                 dbus_error_free(&error);
1128                                 goto finish;
1129                         } else if (target->meta.load_state == UNIT_ERROR) {
1130                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1131                                 goto finish;
1132                         } else if (target->meta.load_state == UNIT_MASKED) {
1133                                 log_error("Rescue target masked.");
1134                                 goto finish;
1135                         }
1136                 }
1137
1138                 assert(target->meta.load_state == UNIT_LOADED);
1139
1140                 if (arg_action == ACTION_TEST) {
1141                         printf("-> By units:\n");
1142                         manager_dump_units(m, stdout, "\t");
1143                 }
1144
1145                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1146                         log_error("Failed to start default target: %s", bus_error(&error, r));
1147                         dbus_error_free(&error);
1148                         goto finish;
1149                 }
1150
1151                 if (arg_action == ACTION_TEST) {
1152                         printf("-> By jobs:\n");
1153                         manager_dump_jobs(m, stdout, "\t");
1154                         retval = EXIT_SUCCESS;
1155                         goto finish;
1156                 }
1157         }
1158
1159         for (;;) {
1160                 if ((r = manager_loop(m)) < 0) {
1161                         log_error("Failed to run mainloop: %s", strerror(-r));
1162                         goto finish;
1163                 }
1164
1165                 switch (m->exit_code) {
1166
1167                 case MANAGER_EXIT:
1168                         retval = EXIT_SUCCESS;
1169                         log_debug("Exit.");
1170                         goto finish;
1171
1172                 case MANAGER_RELOAD:
1173                         log_info("Reloading.");
1174                         if ((r = manager_reload(m)) < 0)
1175                                 log_error("Failed to reload: %s", strerror(-r));
1176                         break;
1177
1178                 case MANAGER_REEXECUTE:
1179                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1180                                 goto finish;
1181
1182                         reexecute = true;
1183                         log_notice("Reexecuting.");
1184                         goto finish;
1185
1186                 case MANAGER_REBOOT:
1187                 case MANAGER_POWEROFF:
1188                 case MANAGER_HALT:
1189                 case MANAGER_KEXEC: {
1190                         static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1191                                 [MANAGER_REBOOT] = "reboot",
1192                                 [MANAGER_POWEROFF] = "poweroff",
1193                                 [MANAGER_HALT] = "halt",
1194                                 [MANAGER_KEXEC] = "kexec"
1195                         };
1196
1197                         assert_se(shutdown_verb = table[m->exit_code]);
1198
1199                         log_notice("Shutting down.");
1200                         goto finish;
1201                 }
1202
1203                 default:
1204                         assert_not_reached("Unknown exit code.");
1205                 }
1206         }
1207
1208 finish:
1209         if (m)
1210                 manager_free(m);
1211
1212         free(arg_default_unit);
1213         free(arg_console);
1214
1215         dbus_shutdown();
1216
1217         label_finish();
1218
1219         if (reexecute) {
1220                 const char *args[15];
1221                 unsigned i = 0;
1222                 char sfd[16];
1223
1224                 assert(serialization);
1225                 assert(fds);
1226
1227                 args[i++] = SYSTEMD_BINARY_PATH;
1228
1229                 args[i++] = "--log-level";
1230                 args[i++] = log_level_to_string(log_get_max_level());
1231
1232                 args[i++] = "--log-target";
1233                 args[i++] = log_target_to_string(log_get_target());
1234
1235                 if (arg_running_as == MANAGER_SYSTEM)
1236                         args[i++] = "--system";
1237                 else
1238                         args[i++] = "--session";
1239
1240                 if (arg_dump_core)
1241                         args[i++] = "--dump-core";
1242
1243                 if (arg_crash_shell)
1244                         args[i++] = "--crash-shell";
1245
1246                 if (arg_confirm_spawn)
1247                         args[i++] = "--confirm-spawn";
1248
1249                 if (arg_show_status)
1250                         args[i++] = "--show-status=1";
1251                 else
1252                         args[i++] = "--show-status=0";
1253
1254 #ifdef HAVE_SYSV_COMPAT
1255                 if (arg_sysv_console)
1256                         args[i++] = "--sysv-console=1";
1257                 else
1258                         args[i++] = "--sysv-console=0";
1259 #endif
1260
1261                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1262                 char_array_0(sfd);
1263
1264                 args[i++] = "--deserialize";
1265                 args[i++] = sfd;
1266
1267                 args[i++] = NULL;
1268
1269                 assert(i <= ELEMENTSOF(args));
1270
1271                 execv(args[0], (char* const*) args);
1272
1273                 log_error("Failed to reexecute: %m");
1274         }
1275
1276         if (serialization)
1277                 fclose(serialization);
1278
1279         if (fds)
1280                 fdset_free(fds);
1281
1282         if (shutdown_verb) {
1283                 const char * command_line[] = {
1284                         SYSTEMD_SHUTDOWN_BINARY_PATH,
1285                         shutdown_verb,
1286                         NULL
1287                 };
1288
1289                 execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line);
1290                 log_error("Failed to execute shutdown binary, freezing: %m");
1291         }
1292
1293         if (getpid() == 1)
1294                 freeze();
1295
1296         return retval;
1297 }