src/main.c

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