src/main.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <dbus/dbus.h>
  23
  24 #include <stdio.h>
  25 #include <errno.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <getopt.h>
  31 #include <signal.h>
  32 #include <sys/wait.h>
  33 #include <fcntl.h>
  34
  35 #include "manager.h"
  36 #include "log.h"
  37 #include "mount-setup.h"
  38 #include "hostname-setup.h"
  39 #include "loopback-setup.h"
  40 #include "kmod-setup.h"
  41 #include "locale-setup.h"
  42 #include "load-fragment.h"
  43 #include "fdset.h"
  44 #include "special.h"
  45 #include "conf-parser.h"
  46 #include "bus-errors.h"
  47 #include "missing.h"
  48 #include "label.h"
  49 #include "build.h"
  50
  51 static enum {
  52         ACTION_RUN,
  53         ACTION_HELP,
  54         ACTION_TEST,
  55         ACTION_DUMP_CONFIGURATION_ITEMS,
  56         ACTION_DONE
  57 } arg_action = ACTION_RUN;
  58
  59 static char *arg_default_unit = NULL;
  60 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  61
  62 static bool arg_dump_core = true;
  63 static bool arg_crash_shell = false;
  64 static int arg_crash_chvt = -1;
  65 static bool arg_confirm_spawn = false;
  66 static bool arg_show_status = true;
  67 #ifdef HAVE_SYSV_COMPAT
  68 static bool arg_sysv_console = true;
  69 #endif
  70 static bool arg_mount_auto = true;
  71 static bool arg_swap_auto = true;
  72 static char *arg_console = NULL;
  73
  74 static FILE* serialization = NULL;
  75
  76 static void nop_handler(int sig) {
  77 }
  78
  79 _noreturn_ static void crash(int sig) {
  80
  81         if (!arg_dump_core)
  82                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  83         else {
  84                 struct sigaction sa;
  85                 pid_t pid;
  86
  87                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  88                 zero(sa);
  89                 sa.sa_handler = nop_handler;
  90                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  91                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  92
  93                 if ((pid = fork()) < 0)
  94                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  95
  96                 else if (pid == 0) {
  97                         struct rlimit rl;
  98
  99                         /* Enable default signal handler for core dump */
 100                         zero(sa);
 101                         sa.sa_handler = SIG_DFL;
 102                         assert_se(sigaction(sig, &sa, NULL) == 0);
 103
 104                         /* Don't limit the core dump size */
 105                         zero(rl);
 106                         rl.rlim_cur = RLIM_INFINITY;
 107                         rl.rlim_max = RLIM_INFINITY;
 108                         setrlimit(RLIMIT_CORE, &rl);
 109
 110                         /* Just to be sure... */
 111                         assert_se(chdir("/") == 0);
 112
 113                         /* Raise the signal again */
 114                         raise(sig);
 115
 116                         assert_not_reached("We shouldn't be here...");
 117                         _exit(1);
 118
 119                 } else {
 120                         siginfo_t status;
 121                         int r;
 122
 123                         /* Order things nicely. */
 124                         if ((r = wait_for_terminate(pid, &status)) < 0)
 125                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
 126                         else if (status.si_code != CLD_DUMPED)
 127                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 128                         else
 129                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 130                 }
 131         }
 132
 133         if (arg_crash_chvt)
 134                 chvt(arg_crash_chvt);
 135
 136         if (arg_crash_shell) {
 137                 struct sigaction sa;
 138                 pid_t pid;
 139
 140                 log_info("Executing crash shell in 10s...");
 141                 sleep(10);
 142
 143                 /* Let the kernel reap children for us */
 144                 zero(sa);
 145                 sa.sa_handler = SIG_IGN;
 146                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 147                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 148
 149                 if ((pid = fork()) < 0)
 150                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 151                 else if (pid == 0) {
 152                         int fd, r;
 153
 154                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 155                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 156                         else if ((r = make_stdio(fd)) < 0)
 157                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 158
 159                         execl("/bin/sh", "/bin/sh", NULL);
 160
 161                         log_error("execl() failed: %s", strerror(errno));
 162                         _exit(1);
 163                 }
 164
 165                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 166         }
 167
 168         log_info("Freezing execution.");
 169         freeze();
 170 }
 171
 172 static void install_crash_handler(void) {
 173         struct sigaction sa;
 174
 175         zero(sa);
 176
 177         sa.sa_handler = crash;
 178         sa.sa_flags = SA_NODEFER;
 179
 180         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 181 }
 182
 183 static int make_null_stdio(void) {
 184         int null_fd, r;
 185
 186         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 187                 log_error("Failed to open /dev/null: %m");
 188                 return -errno;
 189         }
 190
 191         if ((r = make_stdio(null_fd)) < 0)
 192                 log_warning("Failed to dup2() device: %s", strerror(-r));
 193
 194         return r;
 195 }
 196
 197 static int console_setup(bool do_reset) {
 198         int tty_fd, r;
 199
 200         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 201          * and make sure we don't have a controlling tty. */
 202
 203         release_terminal();
 204
 205         if (!do_reset)
 206                 return 0;
 207
 208         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 209                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 210                 return -tty_fd;
 211         }
 212
 213         if ((r = reset_terminal(tty_fd)) < 0)
 214                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 215
 216         close_nointr_nofail(tty_fd);
 217         return r;
 218 }
 219
 220 static int set_default_unit(const char *u) {
 221         char *c;
 222
 223         assert(u);
 224
 225         if (!(c = strdup(u)))
 226                 return -ENOMEM;
 227
 228         free(arg_default_unit);
 229         arg_default_unit = c;
 230         return 0;
 231 }
 232
 233 static int parse_proc_cmdline_word(const char *word) {
 234
 235         static const char * const rlmap[] = {
 236                 "emergency", SPECIAL_EMERGENCY_TARGET,
 237                 "single",    SPECIAL_RESCUE_TARGET,
 238                 "-s",        SPECIAL_RESCUE_TARGET,
 239                 "s",         SPECIAL_RESCUE_TARGET,
 240                 "S",         SPECIAL_RESCUE_TARGET,
 241                 "1",         SPECIAL_RESCUE_TARGET,
 242                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 243                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 244                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 245                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 246         };
 247
 248         assert(word);
 249
 250         if (startswith(word, "systemd.unit="))
 251                 return set_default_unit(word + 13);
 252
 253         else if (startswith(word, "systemd.log_target=")) {
 254
 255                 if (log_set_target_from_string(word + 19) < 0)
 256                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 257
 258         } else if (startswith(word, "systemd.log_level=")) {
 259
 260                 if (log_set_max_level_from_string(word + 18) < 0)
 261                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 262
 263         } else if (startswith(word, "systemd.log_color=")) {
 264
 265                 if (log_show_color_from_string(word + 18) < 0)
 266                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 267
 268         } else if (startswith(word, "systemd.log_location=")) {
 269
 270                 if (log_show_location_from_string(word + 21) < 0)
 271                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 272
 273         } else if (startswith(word, "systemd.dump_core=")) {
 274                 int r;
 275
 276                 if ((r = parse_boolean(word + 18)) < 0)
 277                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 278                 else
 279                         arg_dump_core = r;
 280
 281         } else if (startswith(word, "systemd.crash_shell=")) {
 282                 int r;
 283
 284                 if ((r = parse_boolean(word + 20)) < 0)
 285                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 286                 else
 287                         arg_crash_shell = r;
 288
 289         } else if (startswith(word, "systemd.confirm_spawn=")) {
 290                 int r;
 291
 292                 if ((r = parse_boolean(word + 22)) < 0)
 293                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 294                 else
 295                         arg_confirm_spawn = r;
 296
 297         } else if (startswith(word, "systemd.crash_chvt=")) {
 298                 int k;
 299
 300                 if (safe_atoi(word + 19, &k) < 0)
 301                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 302                 else
 303                         arg_crash_chvt = k;
 304
 305         } else if (startswith(word, "systemd.show_status=")) {
 306                 int r;
 307
 308                 if ((r = parse_boolean(word + 20)) < 0)
 309                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 310                 else
 311                         arg_show_status = r;
 312 #ifdef HAVE_SYSV_COMPAT
 313         } else if (startswith(word, "systemd.sysv_console=")) {
 314                 int r;
 315
 316                 if ((r = parse_boolean(word + 21)) < 0)
 317                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 318                 else
 319                         arg_sysv_console = r;
 320 #endif
 321
 322         } else if (startswith(word, "systemd.")) {
 323
 324                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 325
 326                 log_info("Supported kernel switches:\n"
 327                          "systemd.unit=UNIT                        Default unit to start\n"
 328                          "systemd.dump_core=0|1                    Dump core on crash\n"
 329                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 330                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 331                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 332                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 333 #ifdef HAVE_SYSV_COMPAT
 334                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 335 #endif
 336                          "systemd.log_target=console|kmsg|syslog|syslog-org-kmsg|null\n"
 337                          "                                         Log target\n"
 338                          "systemd.log_level=LEVEL                  Log level\n"
 339                          "systemd.log_color=0|1                    Highlight important log messages\n"
 340                          "systemd.log_location=0|1                 Include code location in log messages\n");
 341
 342         } else if (startswith(word, "console=")) {
 343                 const char *k;
 344                 size_t l;
 345                 char *w = NULL;
 346
 347                 k = word + 8;
 348                 l = strcspn(k, ",");
 349
 350                 /* Ignore the console setting if set to a VT */
 351                 if (l < 4 ||
 352                     !startswith(k, "tty") ||
 353                     k[3+strspn(k+3, "0123456789")] != 0) {
 354
 355                         if (!(w = strndup(k, l)))
 356                                 return -ENOMEM;
 357                 }
 358
 359                 free(arg_console);
 360                 arg_console = w;
 361
 362         } else if (streq(word, "quiet")) {
 363                 arg_show_status = false;
 364 #ifdef HAVE_SYSV_COMPAT
 365                 arg_sysv_console = false;
 366 #endif
 367         } else {
 368                 unsigned i;
 369
 370                 /* SysV compatibility */
 371                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 372                         if (streq(word, rlmap[i]))
 373                                 return set_default_unit(rlmap[i+1]);
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int config_parse_level(
 380                 const char *filename,
 381                 unsigned line,
 382                 const char *section,
 383                 const char *lvalue,
 384                 const char *rvalue,
 385                 void *data,
 386                 void *userdata) {
 387
 388         assert(filename);
 389         assert(lvalue);
 390         assert(rvalue);
 391
 392         log_set_max_level_from_string(rvalue);
 393         return 0;
 394 }
 395
 396 static int config_parse_target(
 397                 const char *filename,
 398                 unsigned line,
 399                 const char *section,
 400                 const char *lvalue,
 401                 const char *rvalue,
 402                 void *data,
 403                 void *userdata) {
 404
 405         assert(filename);
 406         assert(lvalue);
 407         assert(rvalue);
 408
 409         log_set_target_from_string(rvalue);
 410         return 0;
 411 }
 412
 413 static int config_parse_color(
 414                 const char *filename,
 415                 unsigned line,
 416                 const char *section,
 417                 const char *lvalue,
 418                 const char *rvalue,
 419                 void *data,
 420                 void *userdata) {
 421
 422         assert(filename);
 423         assert(lvalue);
 424         assert(rvalue);
 425
 426         log_show_color_from_string(rvalue);
 427         return 0;
 428 }
 429
 430 static int config_parse_location(
 431                 const char *filename,
 432                 unsigned line,
 433                 const char *section,
 434                 const char *lvalue,
 435                 const char *rvalue,
 436                 void *data,
 437                 void *userdata) {
 438
 439         assert(filename);
 440         assert(lvalue);
 441         assert(rvalue);
 442
 443         log_show_location_from_string(rvalue);
 444         return 0;
 445 }
 446
 447 static int config_parse_cpu_affinity(
 448                 const char *filename,
 449                 unsigned line,
 450                 const char *section,
 451                 const char *lvalue,
 452                 const char *rvalue,
 453                 void *data,
 454                 void *userdata) {
 455
 456         char *w;
 457         size_t l;
 458         char *state;
 459         cpu_set_t *c = NULL;
 460         unsigned ncpus = 0;
 461
 462         assert(filename);
 463         assert(lvalue);
 464         assert(rvalue);
 465
 466         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 467                 char *t;
 468                 int r;
 469                 unsigned cpu;
 470
 471                 if (!(t = strndup(w, l)))
 472                         return -ENOMEM;
 473
 474                 r = safe_atou(t, &cpu);
 475                 free(t);
 476
 477                 if (!c)
 478                         if (!(c = cpu_set_malloc(&ncpus)))
 479                                 return -ENOMEM;
 480
 481                 if (r < 0 || cpu >= ncpus) {
 482                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 483                         CPU_FREE(c);
 484                         return -EBADMSG;
 485                 }
 486
 487                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 488         }
 489
 490         if (c) {
 491                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 492                         log_warning("Failed to set CPU affinity: %m");
 493
 494                 CPU_FREE(c);
 495         }
 496
 497         return 0;
 498 }
 499
 500 static int parse_config_file(void) {
 501
 502         const ConfigItem items[] = {
 503                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 504                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 505                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 506                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 507                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 508                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 509                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 510 #ifdef HAVE_SYSV_COMPAT
 511                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 512 #endif
 513                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 514                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 515                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 516                 { "SwapAuto",    config_parse_bool,         &arg_swap_auto,     "Manager" },
 517                 { NULL, NULL, NULL, NULL }
 518         };
 519
 520         static const char * const sections[] = {
 521                 "Manager",
 522                 NULL
 523         };
 524
 525         FILE *f;
 526         const char *fn;
 527         int r;
 528
 529         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 530
 531         if (!(f = fopen(fn, "re"))) {
 532                 if (errno == ENOENT)
 533                         return 0;
 534
 535                 log_warning("Failed to open configuration file '%s': %m", fn);
 536                 return 0;
 537         }
 538
 539         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 540                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 541
 542         fclose(f);
 543
 544         return 0;
 545 }
 546
 547 static int parse_proc_cmdline(void) {
 548         char *line, *w, *state;
 549         int r;
 550         size_t l;
 551
 552         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 553                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 554                 return 0;
 555         }
 556
 557         FOREACH_WORD_QUOTED(w, l, line, state) {
 558                 char *word;
 559
 560                 if (!(word = strndup(w, l))) {
 561                         r = -ENOMEM;
 562                         goto finish;
 563                 }
 564
 565                 r = parse_proc_cmdline_word(word);
 566                 free(word);
 567
 568                 if (r < 0)
 569                         goto finish;
 570         }
 571
 572         r = 0;
 573
 574 finish:
 575         free(line);
 576         return r;
 577 }
 578
 579 static int parse_argv(int argc, char *argv[]) {
 580
 581         enum {
 582                 ARG_LOG_LEVEL = 0x100,
 583                 ARG_LOG_TARGET,
 584                 ARG_LOG_COLOR,
 585                 ARG_LOG_LOCATION,
 586                 ARG_UNIT,
 587                 ARG_SYSTEM,
 588                 ARG_SESSION,
 589                 ARG_TEST,
 590                 ARG_DUMP_CONFIGURATION_ITEMS,
 591                 ARG_DUMP_CORE,
 592                 ARG_CRASH_SHELL,
 593                 ARG_CONFIRM_SPAWN,
 594                 ARG_SHOW_STATUS,
 595                 ARG_SYSV_CONSOLE,
 596                 ARG_DESERIALIZE,
 597                 ARG_INTROSPECT
 598         };
 599
 600         static const struct option options[] = {
 601                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 602                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 603                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 604                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 605                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 606                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 607                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 608                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 609                 { "help",                     no_argument,       NULL, 'h'                          },
 610                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 611                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 612                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 613                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 614                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 615 #ifdef HAVE_SYSV_COMPAT
 616                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 617 #endif
 618                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 619                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 620                 { NULL,                       0,                 NULL, 0                            }
 621         };
 622
 623         int c, r;
 624
 625         assert(argc >= 1);
 626         assert(argv);
 627
 628         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 629
 630                 switch (c) {
 631
 632                 case ARG_LOG_LEVEL:
 633                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 634                                 log_error("Failed to parse log level %s.", optarg);
 635                                 return r;
 636                         }
 637
 638                         break;
 639
 640                 case ARG_LOG_TARGET:
 641
 642                         if ((r = log_set_target_from_string(optarg)) < 0) {
 643                                 log_error("Failed to parse log target %s.", optarg);
 644                                 return r;
 645                         }
 646
 647                         break;
 648
 649                 case ARG_LOG_COLOR:
 650
 651                         if (optarg) {
 652                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 653                                         log_error("Failed to parse log color setting %s.", optarg);
 654                                         return r;
 655                                 }
 656                         } else
 657                                 log_show_color(true);
 658
 659                         break;
 660
 661                 case ARG_LOG_LOCATION:
 662
 663                         if (optarg) {
 664                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 665                                         log_error("Failed to parse log location setting %s.", optarg);
 666                                         return r;
 667                                 }
 668                         } else
 669                                 log_show_location(true);
 670
 671                         break;
 672
 673                 case ARG_UNIT:
 674
 675                         if ((r = set_default_unit(optarg)) < 0) {
 676                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 677                                 return r;
 678                         }
 679
 680                         break;
 681
 682                 case ARG_SYSTEM:
 683                         arg_running_as = MANAGER_SYSTEM;
 684                         break;
 685
 686                 case ARG_SESSION:
 687                         arg_running_as = MANAGER_SESSION;
 688                         break;
 689
 690                 case ARG_TEST:
 691                         arg_action = ACTION_TEST;
 692                         break;
 693
 694                 case ARG_DUMP_CONFIGURATION_ITEMS:
 695                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 696                         break;
 697
 698                 case ARG_DUMP_CORE:
 699                         arg_dump_core = true;
 700                         break;
 701
 702                 case ARG_CRASH_SHELL:
 703                         arg_crash_shell = true;
 704                         break;
 705
 706                 case ARG_CONFIRM_SPAWN:
 707                         arg_confirm_spawn = true;
 708                         break;
 709
 710                 case ARG_SHOW_STATUS:
 711
 712                         if (optarg) {
 713                                 if ((r = parse_boolean(optarg)) < 0) {
 714                                         log_error("Failed to show status boolean %s.", optarg);
 715                                         return r;
 716                                 }
 717                                 arg_show_status = r;
 718                         } else
 719                                 arg_show_status = true;
 720                         break;
 721 #ifdef HAVE_SYSV_COMPAT
 722                 case ARG_SYSV_CONSOLE:
 723
 724                         if (optarg) {
 725                                 if ((r = parse_boolean(optarg)) < 0) {
 726                                         log_error("Failed to SysV console boolean %s.", optarg);
 727                                         return r;
 728                                 }
 729                                 arg_sysv_console = r;
 730                         } else
 731                                 arg_sysv_console = true;
 732                         break;
 733 #endif
 734
 735                 case ARG_DESERIALIZE: {
 736                         int fd;
 737                         FILE *f;
 738
 739                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 740                                 log_error("Failed to parse deserialize option %s.", optarg);
 741                                 return r;
 742                         }
 743
 744                         if (!(f = fdopen(fd, "r"))) {
 745                                 log_error("Failed to open serialization fd: %m");
 746                                 return r;
 747                         }
 748
 749                         if (serialization)
 750                                 fclose(serialization);
 751
 752                         serialization = f;
 753
 754                         break;
 755                 }
 756
 757                 case ARG_INTROSPECT: {
 758                         const char * const * i = NULL;
 759
 760                         for (i = bus_interface_table; *i; i += 2)
 761                                 if (!optarg || streq(i[0], optarg)) {
 762                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 763                                               "<node>\n", stdout);
 764                                         fputs(i[1], stdout);
 765                                         fputs("</node>\n", stdout);
 766
 767                                         if (optarg)
 768                                                 break;
 769                                 }
 770
 771                         if (!i[0] && optarg)
 772                                 log_error("Unknown interface %s.", optarg);
 773
 774                         arg_action = ACTION_DONE;
 775                         break;
 776                 }
 777
 778                 case 'h':
 779                         arg_action = ACTION_HELP;
 780                         break;
 781
 782                 case 'D':
 783                         log_set_max_level(LOG_DEBUG);
 784                         break;
 785
 786                 case '?':
 787                         return -EINVAL;
 788
 789                 default:
 790                         log_error("Unknown option code %c", c);
 791                         return -EINVAL;
 792                 }
 793
 794         /* PID 1 will get the kernel arguments as parameters, which we
 795          * ignore and unconditionally read from
 796          * /proc/cmdline. However, we need to ignore those arguments
 797          * here. */
 798         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 799                 log_error("Excess arguments.");
 800                 return -EINVAL;
 801         }
 802
 803         return 0;
 804 }
 805
 806 static int help(void) {
 807
 808         printf("%s [OPTIONS...]\n\n"
 809                "Starts up and maintains the system or a session.\n\n"
 810                "  -h --help                      Show this help\n"
 811                "     --test                      Determine startup sequence, dump it and exit\n"
 812                "     --dump-configuration-items  Dump understood unit configuration items\n"
 813                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 814                "     --unit=UNIT                 Set default unit\n"
 815                "     --system                    Run a system instance, even if PID != 1\n"
 816                "     --session                   Run a session instance\n"
 817                "     --dump-core                 Dump core on crash\n"
 818                "     --crash-shell               Run shell on crash\n"
 819                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 820                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 821 #ifdef HAVE_SYSV_COMPAT
 822                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 823 #endif
 824                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 825                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 826                "     --log-color[=0|1]           Highlight important log messages\n"
 827                "     --log-location[=0|1]        Include code location in log messages\n",
 828                program_invocation_short_name);
 829
 830         return 0;
 831 }
 832
 833 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 834         FILE *f = NULL;
 835         FDSet *fds = NULL;
 836         int r;
 837
 838         assert(m);
 839         assert(_f);
 840         assert(_fds);
 841
 842         if ((r = manager_open_serialization(m, &f)) < 0) {
 843                 log_error("Failed to create serialization faile: %s", strerror(-r));
 844                 goto fail;
 845         }
 846
 847         if (!(fds = fdset_new())) {
 848                 r = -ENOMEM;
 849                 log_error("Failed to allocate fd set: %s", strerror(-r));
 850                 goto fail;
 851         }
 852
 853         if ((r = manager_serialize(m, f, fds)) < 0) {
 854                 log_error("Failed to serialize state: %s", strerror(-r));
 855                 goto fail;
 856         }
 857
 858         if (fseeko(f, 0, SEEK_SET) < 0) {
 859                 log_error("Failed to rewind serialization fd: %m");
 860                 goto fail;
 861         }
 862
 863         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 864                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 865                 goto fail;
 866         }
 867
 868         if ((r = fdset_cloexec(fds, false)) < 0) {
 869                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 870                 goto fail;
 871         }
 872
 873         *_f = f;
 874         *_fds = fds;
 875
 876         return 0;
 877
 878 fail:
 879         fdset_free(fds);
 880
 881         if (f)
 882                 fclose(f);
 883
 884         return r;
 885 }
 886
 887 int main(int argc, char *argv[]) {
 888         Manager *m = NULL;
 889         int r, retval = EXIT_FAILURE;
 890         FDSet *fds = NULL;
 891         bool reexecute = false;
 892         const char *shutdown_verb = NULL;
 893
 894         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 895                 /* This is compatbility support for SysV, where
 896                  * calling init as a user is identical to telinit. */
 897
 898                 errno = -ENOENT;
 899                 execv(SYSTEMCTL_BINARY_PATH, argv);
 900                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 901                 return 1;
 902         }
 903
 904         log_show_color(isatty(STDERR_FILENO) > 0);
 905         log_show_location(false);
 906         log_set_max_level(LOG_INFO);
 907
 908         if (getpid() == 1) {
 909                 arg_running_as = MANAGER_SYSTEM;
 910                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 911
 912                 if (label_init() < 0)
 913                         goto finish;
 914         } else {
 915                 arg_running_as = MANAGER_SESSION;
 916                 log_set_target(LOG_TARGET_CONSOLE);
 917         }
 918
 919         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 920                 goto finish;
 921
 922         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 923          * /proc/$PID/fd is available. */
 924         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 925                 if (mount_setup() < 0)
 926                         goto finish;
 927
 928         /* Reset all signal handlers. */
 929         assert_se(reset_all_signal_handlers() == 0);
 930
 931         /* If we are init, we can block sigkill. Yay. */
 932         ignore_signals(SIGNALS_IGNORE, -1);
 933
 934         if (parse_config_file() < 0)
 935                 goto finish;
 936
 937         if (arg_running_as == MANAGER_SYSTEM)
 938                 if (parse_proc_cmdline() < 0)
 939                         goto finish;
 940
 941         log_parse_environment();
 942
 943         if (parse_argv(argc, argv) < 0)
 944                 goto finish;
 945
 946         if (arg_action == ACTION_HELP) {
 947                 retval = help();
 948                 goto finish;
 949         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 950                 unit_dump_config_items(stdout);
 951                 retval = EXIT_SUCCESS;
 952                 goto finish;
 953         } else if (arg_action == ACTION_DONE) {
 954                 retval = EXIT_SUCCESS;
 955                 goto finish;
 956         }
 957
 958         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 959
 960         /* Remember open file descriptors for later deserialization */
 961         if (serialization) {
 962                 if ((r = fdset_new_fill(&fds)) < 0) {
 963                         log_error("Failed to allocate fd set: %s", strerror(-r));
 964                         goto finish;
 965                 }
 966
 967                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 968         } else
 969                 close_all_fds(NULL, 0);
 970
 971         /* Set up PATH unless it is already set */
 972         setenv("PATH",
 973                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 974                arg_running_as == MANAGER_SYSTEM);
 975
 976         /* Unset some environment variables passed in from the kernel
 977          * that don't really make sense for us. */
 978         if (arg_running_as == MANAGER_SYSTEM) {
 979                 unsetenv("HOME");
 980                 unsetenv("TERM");
 981         }
 982
 983         /* Move out of the way, so that we won't block unmounts */
 984         assert_se(chdir("/")  == 0);
 985
 986         if (arg_running_as == MANAGER_SYSTEM) {
 987                 /* Become a session leader if we aren't one yet. */
 988                 setsid();
 989
 990                 /* Disable the umask logic */
 991                 umask(0);
 992         }
 993
 994         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 995         dbus_connection_set_change_sigpipe(FALSE);
 996
 997         /* Reset the console, but only if this is really init and we
 998          * are freshly booted */
 999         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
1000                 console_setup(getpid() == 1 && !serialization);
1001                 make_null_stdio();
1002         }
1003
1004         /* Open the logging devices, if possible and necessary */
1005         log_open();
1006
1007         /* Make sure we leave a core dump without panicing the
1008          * kernel. */
1009         if (getpid() == 1)
1010                 install_crash_handler();
1011
1012         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1013                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1014
1015         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1016                 locale_setup();
1017
1018                 if (arg_show_status)
1019                         status_welcome();
1020
1021                 kmod_setup();
1022                 hostname_setup();
1023                 loopback_setup();
1024
1025                 mkdir_p("/dev/.systemd/ask-password/", 0755);
1026         }
1027
1028         if ((r = manager_new(arg_running_as, &m)) < 0) {
1029                 log_error("Failed to allocate manager object: %s", strerror(-r));
1030                 goto finish;
1031         }
1032
1033         m->confirm_spawn = arg_confirm_spawn;
1034         m->show_status = arg_show_status;
1035 #ifdef HAVE_SYSV_COMPAT
1036         m->sysv_console = arg_sysv_console;
1037 #endif
1038         m->mount_auto = arg_mount_auto;
1039         m->swap_auto = arg_swap_auto;
1040
1041         if (arg_console)
1042                 manager_set_console(m, arg_console);
1043
1044         if ((r = manager_startup(m, serialization, fds)) < 0)
1045                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1046
1047         if (fds) {
1048                 /* This will close all file descriptors that were opened, but
1049                  * not claimed by any unit. */
1050
1051                 fdset_free(fds);
1052                 fds = NULL;
1053         }
1054
1055         if (serialization) {
1056                 fclose(serialization);
1057                 serialization = NULL;
1058         } else {
1059                 DBusError error;
1060                 Unit *target = NULL;
1061
1062                 dbus_error_init(&error);
1063
1064                 log_debug("Activating default unit: %s", arg_default_unit);
1065
1066                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1067                         log_error("Failed to load default target: %s", bus_error(&error, r));
1068                         dbus_error_free(&error);
1069                 } else if (target->meta.load_state == UNIT_ERROR)
1070                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1071                 else if (target->meta.load_state == UNIT_MASKED)
1072                         log_error("Default target masked.");
1073
1074                 if (!target || target->meta.load_state != UNIT_LOADED) {
1075                         log_info("Trying to load rescue target...");
1076
1077                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1078                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1079                                 dbus_error_free(&error);
1080                                 goto finish;
1081                         } else if (target->meta.load_state == UNIT_ERROR) {
1082                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1083                                 goto finish;
1084                         } else if (target->meta.load_state == UNIT_MASKED) {
1085                                 log_error("Rescue target masked.");
1086                                 goto finish;
1087                         }
1088                 }
1089
1090                 assert(target->meta.load_state == UNIT_LOADED);
1091
1092                 if (arg_action == ACTION_TEST) {
1093                         printf("-> By units:\n");
1094                         manager_dump_units(m, stdout, "\t");
1095                 }
1096
1097                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1098                         log_error("Failed to start default target: %s", bus_error(&error, r));
1099                         dbus_error_free(&error);
1100                         goto finish;
1101                 }
1102
1103                 if (arg_action == ACTION_TEST) {
1104                         printf("-> By jobs:\n");
1105                         manager_dump_jobs(m, stdout, "\t");
1106                         retval = EXIT_SUCCESS;
1107                         goto finish;
1108                 }
1109         }
1110
1111         for (;;) {
1112                 if ((r = manager_loop(m)) < 0) {
1113                         log_error("Failed to run mainloop: %s", strerror(-r));
1114                         goto finish;
1115                 }
1116
1117                 switch (m->exit_code) {
1118
1119                 case MANAGER_EXIT:
1120                         retval = EXIT_SUCCESS;
1121                         log_debug("Exit.");
1122                         goto finish;
1123
1124                 case MANAGER_RELOAD:
1125                         log_info("Reloading.");
1126                         if ((r = manager_reload(m)) < 0)
1127                                 log_error("Failed to reload: %s", strerror(-r));
1128                         break;
1129
1130                 case MANAGER_REEXECUTE:
1131                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1132                                 goto finish;
1133
1134                         reexecute = true;
1135                         log_notice("Reexecuting.");
1136                         goto finish;
1137
1138                 case MANAGER_REBOOT:
1139                 case MANAGER_POWEROFF:
1140                 case MANAGER_HALT:
1141                 case MANAGER_KEXEC: {
1142                         static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1143                                 [MANAGER_REBOOT] = "reboot",
1144                                 [MANAGER_POWEROFF] = "poweroff",
1145                                 [MANAGER_HALT] = "halt",
1146                                 [MANAGER_KEXEC] = "kexec"
1147                         };
1148
1149                         assert_se(shutdown_verb = table[m->exit_code]);
1150
1151                         log_notice("Shutting down.");
1152                         goto finish;
1153                 }
1154
1155                 default:
1156                         assert_not_reached("Unknown exit code.");
1157                 }
1158         }
1159
1160 finish:
1161         if (m)
1162                 manager_free(m);
1163
1164         free(arg_default_unit);
1165         free(arg_console);
1166
1167         dbus_shutdown();
1168
1169         label_finish();
1170
1171         if (reexecute) {
1172                 const char *args[15];
1173                 unsigned i = 0;
1174                 char sfd[16];
1175
1176                 assert(serialization);
1177                 assert(fds);
1178
1179                 args[i++] = SYSTEMD_BINARY_PATH;
1180
1181                 args[i++] = "--log-level";
1182                 args[i++] = log_level_to_string(log_get_max_level());
1183
1184                 args[i++] = "--log-target";
1185                 args[i++] = log_target_to_string(log_get_target());
1186
1187                 if (arg_running_as == MANAGER_SYSTEM)
1188                         args[i++] = "--system";
1189                 else
1190                         args[i++] = "--session";
1191
1192                 if (arg_dump_core)
1193                         args[i++] = "--dump-core";
1194
1195                 if (arg_crash_shell)
1196                         args[i++] = "--crash-shell";
1197
1198                 if (arg_confirm_spawn)
1199                         args[i++] = "--confirm-spawn";
1200
1201                 if (arg_show_status)
1202                         args[i++] = "--show-status=1";
1203                 else
1204                         args[i++] = "--show-status=0";
1205
1206 #ifdef HAVE_SYSV_COMPAT
1207                 if (arg_sysv_console)
1208                         args[i++] = "--sysv-console=1";
1209                 else
1210                         args[i++] = "--sysv-console=0";
1211 #endif
1212
1213                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1214                 char_array_0(sfd);
1215
1216                 args[i++] = "--deserialize";
1217                 args[i++] = sfd;
1218
1219                 args[i++] = NULL;
1220
1221                 assert(i <= ELEMENTSOF(args));
1222
1223                 execv(args[0], (char* const*) args);
1224
1225                 log_error("Failed to reexecute: %m");
1226         }
1227
1228         if (serialization)
1229                 fclose(serialization);
1230
1231         if (fds)
1232                 fdset_free(fds);
1233
1234         if (shutdown_verb) {
1235                 const char * command_line[] = {
1236                         SYSTEMD_SHUTDOWN_BINARY_PATH,
1237                         shutdown_verb,
1238                         NULL
1239                 };
1240
1241                 execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line);
1242                 log_error("Failed to execute shutdown binary, freezing: %m");
1243         }
1244
1245         if (getpid() == 1)
1246                 freeze();
1247
1248         return retval;
1249 }