src/main.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   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 "modprobe-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
  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 char *arg_console = 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_nomodules = false;
  67 static bool arg_show_status = true;
  68 static bool arg_sysv_console = 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         if (startswith(word, "systemd.unit="))
 248                 return set_default_unit(word + 13);
 249
 250         else if (startswith(word, "systemd.log_target=")) {
 251
 252                 if (log_set_target_from_string(word + 19) < 0)
 253                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 254
 255         } else if (startswith(word, "systemd.log_level=")) {
 256
 257                 if (log_set_max_level_from_string(word + 18) < 0)
 258                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 259
 260         } else if (startswith(word, "systemd.log_color=")) {
 261
 262                 if (log_show_color_from_string(word + 18) < 0)
 263                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 264
 265         } else if (startswith(word, "systemd.log_location=")) {
 266
 267                 if (log_show_location_from_string(word + 21) < 0)
 268                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 269
 270         } else if (startswith(word, "systemd.dump_core=")) {
 271                 int r;
 272
 273                 if ((r = parse_boolean(word + 18)) < 0)
 274                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 275                 else
 276                         arg_dump_core = r;
 277
 278         } else if (startswith(word, "systemd.crash_shell=")) {
 279                 int r;
 280
 281                 if ((r = parse_boolean(word + 20)) < 0)
 282                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 283                 else
 284                         arg_crash_shell = r;
 285
 286         } else if (startswith(word, "systemd.confirm_spawn=")) {
 287                 int r;
 288
 289                 if ((r = parse_boolean(word + 22)) < 0)
 290                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 291                 else
 292                         arg_confirm_spawn = r;
 293
 294         } else if (startswith(word, "systemd.crash_chvt=")) {
 295                 int k;
 296
 297                 if (safe_atoi(word + 19, &k) < 0)
 298                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 299                 else
 300                         arg_crash_chvt = k;
 301
 302         } else if (startswith(word, "systemd.show_status=")) {
 303                 int r;
 304
 305                 if ((r = parse_boolean(word + 20)) < 0)
 306                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 307                 else
 308                         arg_show_status = r;
 309
 310         } else if (startswith(word, "systemd.sysv_console=")) {
 311                 int r;
 312
 313                 if ((r = parse_boolean(word + 21)) < 0)
 314                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 315                 else
 316                         arg_sysv_console = r;
 317
 318         } else if (startswith(word, "systemd.")) {
 319
 320                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 321
 322                 log_info("Supported kernel switches:\n"
 323                          "systemd.unit=UNIT                        Default unit to start\n"
 324                          "systemd.dump_core=0|1                    Dump core on crash\n"
 325                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 326                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 327                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 328                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 329                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 330                          "systemd.log_target=console|kmsg|syslog|syslog-org-kmsg|null\n"
 331                          "                                         Log target\n"
 332                          "systemd.log_level=LEVEL                  Log level\n"
 333                          "systemd.log_color=0|1                    Highlight important log messages\n"
 334                          "systemd.log_location=0|1                 Include code location in log messages\n");
 335
 336         } else if (streq(word, "nomodules"))
 337                 arg_nomodules = true;
 338         else if (startswith(word, "console=")) {
 339                 const char *k;
 340                 size_t l;
 341                 char *w = NULL;
 342
 343                 k = word + 8;
 344                 l = strcspn(k, ",");
 345
 346                 if (l < 4 ||
 347                     !startswith(k, "tty") ||
 348                     k[3+strspn(k+3, "0123456789")] != 0) {
 349
 350                         if (!(w = strndup(k, l)))
 351                                 return -ENOMEM;
 352                 }
 353
 354                 free(arg_console);
 355                 arg_console = w;
 356
 357         } else if (streq(word, "quiet")) {
 358                 arg_show_status = false;
 359                 arg_sysv_console = false;
 360         } else {
 361                 unsigned i;
 362
 363                 /* SysV compatibility */
 364                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 365                         if (streq(word, rlmap[i]))
 366                                 return set_default_unit(rlmap[i+1]);
 367         }
 368
 369         return 0;
 370 }
 371
 372 static int config_parse_level(
 373                 const char *filename,
 374                 unsigned line,
 375                 const char *section,
 376                 const char *lvalue,
 377                 const char *rvalue,
 378                 void *data,
 379                 void *userdata) {
 380
 381         assert(filename);
 382         assert(lvalue);
 383         assert(rvalue);
 384
 385         log_set_max_level_from_string(rvalue);
 386         return 0;
 387 }
 388
 389 static int config_parse_target(
 390                 const char *filename,
 391                 unsigned line,
 392                 const char *section,
 393                 const char *lvalue,
 394                 const char *rvalue,
 395                 void *data,
 396                 void *userdata) {
 397
 398         assert(filename);
 399         assert(lvalue);
 400         assert(rvalue);
 401
 402         log_set_target_from_string(rvalue);
 403         return 0;
 404 }
 405
 406 static int config_parse_color(
 407                 const char *filename,
 408                 unsigned line,
 409                 const char *section,
 410                 const char *lvalue,
 411                 const char *rvalue,
 412                 void *data,
 413                 void *userdata) {
 414
 415         assert(filename);
 416         assert(lvalue);
 417         assert(rvalue);
 418
 419         log_show_color_from_string(rvalue);
 420         return 0;
 421 }
 422
 423 static int config_parse_location(
 424                 const char *filename,
 425                 unsigned line,
 426                 const char *section,
 427                 const char *lvalue,
 428                 const char *rvalue,
 429                 void *data,
 430                 void *userdata) {
 431
 432         assert(filename);
 433         assert(lvalue);
 434         assert(rvalue);
 435
 436         log_show_location_from_string(rvalue);
 437         return 0;
 438 }
 439
 440 static int config_parse_cpu_affinity(
 441                 const char *filename,
 442                 unsigned line,
 443                 const char *section,
 444                 const char *lvalue,
 445                 const char *rvalue,
 446                 void *data,
 447                 void *userdata) {
 448
 449         char *w;
 450         size_t l;
 451         char *state;
 452         cpu_set_t *c = NULL;
 453         unsigned ncpus = 0;
 454
 455         assert(filename);
 456         assert(lvalue);
 457         assert(rvalue);
 458
 459         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 460                 char *t;
 461                 int r;
 462                 unsigned cpu;
 463
 464                 if (!(t = strndup(w, l)))
 465                         return -ENOMEM;
 466
 467                 r = safe_atou(t, &cpu);
 468                 free(t);
 469
 470                 if (!c)
 471                         if (!(c = cpu_set_malloc(&ncpus)))
 472                                 return -ENOMEM;
 473
 474                 if (r < 0 || cpu >= ncpus) {
 475                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 476                         CPU_FREE(c);
 477                         return -EBADMSG;
 478                 }
 479
 480                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 481         }
 482
 483         if (c) {
 484                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 485                         log_warning("Failed to set CPU affinity: %m");
 486
 487                 CPU_FREE(c);
 488         }
 489
 490         return 0;
 491 }
 492
 493 static int parse_config_file(void) {
 494
 495         const ConfigItem items[] = {
 496                 { "LogLevel",    config_parse_level,        NULL,             "Manager" },
 497                 { "LogTarget",   config_parse_target,       NULL,             "Manager" },
 498                 { "LogColor",    config_parse_color,        NULL,             "Manager" },
 499                 { "LogLocation", config_parse_location,     NULL,             "Manager" },
 500                 { "DumpCore",    config_parse_bool,         &arg_dump_core,   "Manager" },
 501                 { "CrashShell",  config_parse_bool,         &arg_crash_shell, "Manager" },
 502                 { "ShowStatus",  config_parse_bool,         &arg_show_status, "Manager" },
 503                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,"Manager" },
 504                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,  "Manager" },
 505                 { "CPUAffinity", config_parse_cpu_affinity, NULL,             "Manager" },
 506                 { NULL, NULL, NULL, NULL }
 507         };
 508
 509         static const char * const sections[] = {
 510                 "Manager",
 511                 NULL
 512         };
 513
 514         FILE *f;
 515         const char *fn;
 516         int r;
 517
 518         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 519
 520         if (!(f = fopen(fn, "re"))) {
 521                 if (errno == ENOENT)
 522                         return 0;
 523
 524                 log_warning("Failed to open configuration file '%s': %m", fn);
 525                 return 0;
 526         }
 527
 528         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 529                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 530
 531         fclose(f);
 532
 533         return 0;
 534 }
 535
 536 static int parse_proc_cmdline(void) {
 537         char *line;
 538         int r;
 539         char *w;
 540         size_t l;
 541         char *state;
 542
 543         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 544                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 545                 return 0;
 546         }
 547
 548         FOREACH_WORD_QUOTED(w, l, line, state) {
 549                 char *word;
 550
 551                 if (!(word = strndup(w, l))) {
 552                         r = -ENOMEM;
 553                         goto finish;
 554                 }
 555
 556                 r = parse_proc_cmdline_word(word);
 557                 free(word);
 558
 559                 if (r < 0)
 560                         goto finish;
 561         }
 562
 563         r = 0;
 564
 565 finish:
 566         free(line);
 567         return r;
 568 }
 569
 570 static int parse_argv(int argc, char *argv[]) {
 571
 572         enum {
 573                 ARG_LOG_LEVEL = 0x100,
 574                 ARG_LOG_TARGET,
 575                 ARG_LOG_COLOR,
 576                 ARG_LOG_LOCATION,
 577                 ARG_UNIT,
 578                 ARG_SYSTEM,
 579                 ARG_SESSION,
 580                 ARG_TEST,
 581                 ARG_DUMP_CONFIGURATION_ITEMS,
 582                 ARG_DUMP_CORE,
 583                 ARG_CRASH_SHELL,
 584                 ARG_CONFIRM_SPAWN,
 585                 ARG_SHOW_STATUS,
 586                 ARG_SYSV_CONSOLE,
 587                 ARG_DESERIALIZE,
 588                 ARG_INTROSPECT
 589         };
 590
 591         static const struct option options[] = {
 592                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 593                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 594                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 595                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 596                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 597                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 598                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 599                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 600                 { "help",                     no_argument,       NULL, 'h'                          },
 601                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 602                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 603                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 604                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 605                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 606                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 607                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 608                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 609                 { NULL,                       0,                 NULL, 0                            }
 610         };
 611
 612         int c, r;
 613
 614         assert(argc >= 1);
 615         assert(argv);
 616
 617         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 618
 619                 switch (c) {
 620
 621                 case ARG_LOG_LEVEL:
 622                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 623                                 log_error("Failed to parse log level %s.", optarg);
 624                                 return r;
 625                         }
 626
 627                         break;
 628
 629                 case ARG_LOG_TARGET:
 630
 631                         if ((r = log_set_target_from_string(optarg)) < 0) {
 632                                 log_error("Failed to parse log target %s.", optarg);
 633                                 return r;
 634                         }
 635
 636                         break;
 637
 638                 case ARG_LOG_COLOR:
 639
 640                         if (optarg) {
 641                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 642                                         log_error("Failed to parse log color setting %s.", optarg);
 643                                         return r;
 644                                 }
 645                         } else
 646                                 log_show_color(true);
 647
 648                         break;
 649
 650                 case ARG_LOG_LOCATION:
 651
 652                         if (optarg) {
 653                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 654                                         log_error("Failed to parse log location setting %s.", optarg);
 655                                         return r;
 656                                 }
 657                         } else
 658                                 log_show_location(true);
 659
 660                         break;
 661
 662                 case ARG_UNIT:
 663
 664                         if ((r = set_default_unit(optarg)) < 0) {
 665                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 666                                 return r;
 667                         }
 668
 669                         break;
 670
 671                 case ARG_SYSTEM:
 672                         arg_running_as = MANAGER_SYSTEM;
 673                         break;
 674
 675                 case ARG_SESSION:
 676                         arg_running_as = MANAGER_SESSION;
 677                         break;
 678
 679                 case ARG_TEST:
 680                         arg_action = ACTION_TEST;
 681                         break;
 682
 683                 case ARG_DUMP_CONFIGURATION_ITEMS:
 684                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 685                         break;
 686
 687                 case ARG_DUMP_CORE:
 688                         arg_dump_core = true;
 689                         break;
 690
 691                 case ARG_CRASH_SHELL:
 692                         arg_crash_shell = true;
 693                         break;
 694
 695                 case ARG_CONFIRM_SPAWN:
 696                         arg_confirm_spawn = true;
 697                         break;
 698
 699                 case ARG_SHOW_STATUS:
 700
 701                         if (optarg) {
 702                                 if ((r = parse_boolean(optarg)) < 0) {
 703                                         log_error("Failed to show status boolean %s.", optarg);
 704                                         return r;
 705                                 }
 706                                 arg_show_status = r;
 707                         } else
 708                                 arg_show_status = true;
 709                         break;
 710
 711                 case ARG_SYSV_CONSOLE:
 712
 713                         if (optarg) {
 714                                 if ((r = parse_boolean(optarg)) < 0) {
 715                                         log_error("Failed to SysV console boolean %s.", optarg);
 716                                         return r;
 717                                 }
 718                                 arg_sysv_console = r;
 719                         } else
 720                                 arg_sysv_console = true;
 721                         break;
 722
 723                 case ARG_DESERIALIZE: {
 724                         int fd;
 725                         FILE *f;
 726
 727                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 728                                 log_error("Failed to parse deserialize option %s.", optarg);
 729                                 return r;
 730                         }
 731
 732                         if (!(f = fdopen(fd, "r"))) {
 733                                 log_error("Failed to open serialization fd: %m");
 734                                 return r;
 735                         }
 736
 737                         if (serialization)
 738                                 fclose(serialization);
 739
 740                         serialization = f;
 741
 742                         break;
 743                 }
 744
 745                 case ARG_INTROSPECT: {
 746                         const char * const * i = NULL;
 747
 748                         for (i = bus_interface_table; *i; i += 2)
 749                                 if (!optarg || streq(i[0], optarg)) {
 750                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 751                                               "<node>\n", stdout);
 752                                         fputs(i[1], stdout);
 753                                         fputs("</node>\n", stdout);
 754
 755                                         if (optarg)
 756                                                 break;
 757                                 }
 758
 759                         if (!i[0] && optarg)
 760                                 log_error("Unknown interface %s.", optarg);
 761
 762                         arg_action = ACTION_DONE;
 763                         break;
 764                 }
 765
 766                 case 'h':
 767                         arg_action = ACTION_HELP;
 768                         break;
 769
 770                 case 'D':
 771                         log_set_max_level(LOG_DEBUG);
 772                         break;
 773
 774                 case '?':
 775                         return -EINVAL;
 776
 777                 default:
 778                         log_error("Unknown option code %c", c);
 779                         return -EINVAL;
 780                 }
 781
 782         /* PID 1 will get the kernel arguments as parameters, which we
 783          * ignore and unconditionally read from
 784          * /proc/cmdline. However, we need to ignore those arguments
 785          * here. */
 786         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 787                 log_error("Excess arguments.");
 788                 return -EINVAL;
 789         }
 790
 791         return 0;
 792 }
 793
 794 static int help(void) {
 795
 796         printf("%s [OPTIONS...]\n\n"
 797                "Starts up and maintains the system or a session.\n\n"
 798                "  -h --help                      Show this help\n"
 799                "     --test                      Determine startup sequence, dump it and exit\n"
 800                "     --dump-configuration-items  Dump understood unit configuration items\n"
 801                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 802                "     --unit=UNIT                 Set default unit\n"
 803                "     --system                    Run a system instance, even if PID != 1\n"
 804                "     --session                   Run a session instance\n"
 805                "     --dump-core                 Dump core on crash\n"
 806                "     --crash-shell               Run shell on crash\n"
 807                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 808                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 809                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 810                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 811                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 812                "     --log-color[=0|1]           Highlight important log messages\n"
 813                "     --log-location[=0|1]        Include code location in log messages\n",
 814                program_invocation_short_name);
 815
 816         return 0;
 817 }
 818
 819 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 820         FILE *f = NULL;
 821         FDSet *fds = NULL;
 822         int r;
 823
 824         assert(m);
 825         assert(_f);
 826         assert(_fds);
 827
 828         if ((r = manager_open_serialization(m, &f)) < 0) {
 829                 log_error("Failed to create serialization faile: %s", strerror(-r));
 830                 goto fail;
 831         }
 832
 833         if (!(fds = fdset_new())) {
 834                 r = -ENOMEM;
 835                 log_error("Failed to allocate fd set: %s", strerror(-r));
 836                 goto fail;
 837         }
 838
 839         if ((r = manager_serialize(m, f, fds)) < 0) {
 840                 log_error("Failed to serialize state: %s", strerror(-r));
 841                 goto fail;
 842         }
 843
 844         if (fseeko(f, 0, SEEK_SET) < 0) {
 845                 log_error("Failed to rewind serialization fd: %m");
 846                 goto fail;
 847         }
 848
 849         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 850                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 851                 goto fail;
 852         }
 853
 854         if ((r = fdset_cloexec(fds, false)) < 0) {
 855                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 856                 goto fail;
 857         }
 858
 859         *_f = f;
 860         *_fds = fds;
 861
 862         return 0;
 863
 864 fail:
 865         fdset_free(fds);
 866
 867         if (f)
 868                 fclose(f);
 869
 870         return r;
 871 }
 872
 873 int main(int argc, char *argv[]) {
 874         Manager *m = NULL;
 875         Unit *target = NULL;
 876         int r, retval = 1;
 877         FDSet *fds = NULL;
 878         bool reexecute = false;
 879
 880         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 881                 /* This is compatbility support for SysV, where
 882                  * calling init as a user is identical to telinit. */
 883
 884                 errno = -ENOENT;
 885                 execv(SYSTEMCTL_BINARY_PATH, argv);
 886                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 887                 return 1;
 888         }
 889
 890         log_show_color(isatty(STDERR_FILENO) > 0);
 891         log_show_location(false);
 892         log_set_max_level(LOG_INFO);
 893
 894         if (getpid() == 1) {
 895                 arg_running_as = MANAGER_SYSTEM;
 896                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 897
 898                 if (label_init() < 0)
 899                         goto finish;
 900         } else {
 901                 arg_running_as = MANAGER_SESSION;
 902                 log_set_target(LOG_TARGET_CONSOLE);
 903         }
 904
 905         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 906                 goto finish;
 907
 908         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 909          * /proc/$PID/fd is available. */
 910         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 911                 if (mount_setup() < 0)
 912                         goto finish;
 913
 914         /* Reset all signal handlers. */
 915         assert_se(reset_all_signal_handlers() == 0);
 916
 917         /* If we are init, we can block sigkill. Yay. */
 918         ignore_signals(SIGNALS_IGNORE, -1);
 919
 920         if (parse_config_file() < 0)
 921                 goto finish;
 922
 923         if (arg_running_as == MANAGER_SYSTEM)
 924                 if (parse_proc_cmdline() < 0)
 925                         goto finish;
 926
 927         log_parse_environment();
 928
 929         if (parse_argv(argc, argv) < 0)
 930                 goto finish;
 931
 932         if (arg_action == ACTION_HELP) {
 933                 retval = help();
 934                 goto finish;
 935         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 936                 unit_dump_config_items(stdout);
 937                 retval = 0;
 938                 goto finish;
 939         } else if (arg_action == ACTION_DONE) {
 940                 retval = 0;
 941                 goto finish;
 942         }
 943
 944         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 945
 946         /* Remember open file descriptors for later deserialization */
 947         if (serialization) {
 948                 if ((r = fdset_new_fill(&fds)) < 0) {
 949                         log_error("Failed to allocate fd set: %s", strerror(-r));
 950                         goto finish;
 951                 }
 952
 953                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 954         } else
 955                 close_all_fds(NULL, 0);
 956
 957         /* Set up PATH unless it is already set */
 958         setenv("PATH",
 959                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 960                arg_running_as == MANAGER_SYSTEM);
 961
 962         /* Move out of the way, so that we won't block unmounts */
 963         assert_se(chdir("/")  == 0);
 964
 965         if (arg_running_as == MANAGER_SYSTEM) {
 966                 /* Become a session leader if we aren't one yet. */
 967                 setsid();
 968
 969                 /* Disable the umask logic */
 970                 umask(0);
 971         }
 972
 973         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 974         dbus_connection_set_change_sigpipe(FALSE);
 975
 976         /* Reset the console, but only if this is really init and we
 977          * are freshly booted */
 978         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 979                 console_setup(getpid() == 1 && !serialization);
 980                 make_null_stdio();
 981         }
 982
 983         /* Open the logging devices, if possible and necessary */
 984         log_open();
 985
 986         /* Make sure we leave a core dump without panicing the
 987          * kernel. */
 988         if (getpid() == 1)
 989                 install_crash_handler();
 990
 991         log_info(PACKAGE_STRING " running in %s mode.", manager_running_as_to_string(arg_running_as));
 992
 993         if (arg_running_as == MANAGER_SYSTEM) {
 994
 995                 /* Disable nscd, to avoid deadlocks when systemd uses
 996                  * NSS and the nscd socket is maintained by us. */
 997                 /* if (nss_disable_nscd) { */
 998                 /*         log_debug("Disabling nscd"); */
 999                 /*         nss_disable_nscd(); */
1000                 /* } else */
1001                 /*         log_debug("Hmm, can't disable nscd."); */
1002
1003                 if (!serialization) {
1004                         if (arg_show_status)
1005                                 status_welcome();
1006                         modprobe_setup(arg_nomodules);
1007                         kmod_setup();
1008                         hostname_setup();
1009                         loopback_setup();
1010                 }
1011         }
1012
1013         if ((r = manager_new(arg_running_as, &m)) < 0) {
1014                 log_error("Failed to allocate manager object: %s", strerror(-r));
1015                 goto finish;
1016         }
1017
1018         m->confirm_spawn = arg_confirm_spawn;
1019         m->show_status = arg_show_status;
1020         m->sysv_console = arg_sysv_console;
1021
1022         if ((r = manager_startup(m, serialization, fds)) < 0)
1023                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1024
1025         if (fds) {
1026                 /* This will close all file descriptors that were opened, but
1027                  * not claimed by any unit. */
1028
1029                 fdset_free(fds);
1030                 fds = NULL;
1031         }
1032
1033         if (serialization) {
1034                 fclose(serialization);
1035                 serialization = NULL;
1036         } else {
1037                 DBusError error;
1038
1039                 dbus_error_init(&error);
1040
1041                 log_debug("Activating default unit: %s", arg_default_unit);
1042
1043                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1044                         log_error("Failed to load default target: %s", bus_error(&error, r));
1045                         dbus_error_free(&error);
1046
1047                         log_info("Trying to load rescue target...");
1048                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1049                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1050                                 dbus_error_free(&error);
1051                                 goto finish;
1052                         }
1053                 }
1054
1055                 if (arg_action == ACTION_TEST) {
1056                         printf("-> By units:\n");
1057                         manager_dump_units(m, stdout, "\t");
1058                 }
1059
1060                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1061                         log_error("Failed to start default target: %s", bus_error(&error, r));
1062                         dbus_error_free(&error);
1063                         goto finish;
1064                 }
1065
1066                 if (arg_console && arg_running_as == MANAGER_SYSTEM) {
1067                         char *name;
1068
1069                         if (asprintf(&name, "getty@%s.service", arg_console) < 0)
1070                                 log_error("Out of memory while generating console getty service name.");
1071                         else {
1072                                 if ((r = manager_add_job_by_name(m, JOB_START, name, JOB_FAIL, false, &error, NULL)) < 0) {
1073                                         log_error("Failed to start console getty target: %s", bus_error(&error, r));
1074                                         dbus_error_free(&error);
1075                                 }
1076
1077                                 free(name);
1078                         }
1079                 }
1080
1081                 if (arg_action == ACTION_TEST) {
1082                         printf("-> By jobs:\n");
1083                         manager_dump_jobs(m, stdout, "\t");
1084                         retval = 0;
1085                         goto finish;
1086                 }
1087         }
1088
1089         for (;;) {
1090                 if ((r = manager_loop(m)) < 0) {
1091                         log_error("Failed to run mainloop: %s", strerror(-r));
1092                         goto finish;
1093                 }
1094
1095                 switch (m->exit_code) {
1096
1097                 case MANAGER_EXIT:
1098                         retval = 0;
1099                         log_debug("Exit.");
1100                         goto finish;
1101
1102                 case MANAGER_RELOAD:
1103                         log_info("Reloading.");
1104                         if ((r = manager_reload(m)) < 0)
1105                                 log_error("Failed to reload: %s", strerror(-r));
1106                         break;
1107
1108                 case MANAGER_REEXECUTE:
1109                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1110                                 goto finish;
1111
1112                         reexecute = true;
1113                         log_notice("Reexecuting.");
1114                         goto finish;
1115
1116                 default:
1117                         assert_not_reached("Unknown exit code.");
1118                 }
1119         }
1120
1121 finish:
1122         if (m)
1123                 manager_free(m);
1124
1125         free(arg_default_unit);
1126         free(arg_console);
1127
1128         dbus_shutdown();
1129
1130         if (reexecute) {
1131                 const char *args[15];
1132                 unsigned i = 0;
1133                 char sfd[16];
1134
1135                 assert(serialization);
1136                 assert(fds);
1137
1138                 args[i++] = SYSTEMD_BINARY_PATH;
1139
1140                 args[i++] = "--log-level";
1141                 args[i++] = log_level_to_string(log_get_max_level());
1142
1143                 args[i++] = "--log-target";
1144                 args[i++] = log_target_to_string(log_get_target());
1145
1146                 if (arg_running_as == MANAGER_SYSTEM)
1147                         args[i++] = "--system";
1148                 else
1149                         args[i++] = "--session";
1150
1151                 if (arg_dump_core)
1152                         args[i++] = "--dump-core";
1153
1154                 if (arg_crash_shell)
1155                         args[i++] = "--crash-shell";
1156
1157                 if (arg_confirm_spawn)
1158                         args[i++] = "--confirm-spawn";
1159
1160                 if (arg_show_status)
1161                         args[i++] = "--show-status=1";
1162                 else
1163                         args[i++] = "--show-status=0";
1164
1165                 if (arg_sysv_console)
1166                         args[i++] = "--sysv-console=1";
1167                 else
1168                         args[i++] = "--sysv-console=0";
1169
1170                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1171                 char_array_0(sfd);
1172
1173                 args[i++] = "--deserialize";
1174                 args[i++] = sfd;
1175
1176                 args[i++] = NULL;
1177
1178                 assert(i <= ELEMENTSOF(args));
1179
1180                 execv(args[0], (char* const*) args);
1181
1182                 log_error("Failed to reexecute: %m");
1183         }
1184
1185         if (serialization)
1186                 fclose(serialization);
1187
1188         if (fds)
1189                 fdset_free(fds);
1190
1191         if (getpid() == 1)
1192                 freeze();
1193
1194         label_finish();
1195
1196         return retval;
1197 }