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