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