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
  49 static enum {
  50         ACTION_RUN,
  51         ACTION_HELP,
  52         ACTION_TEST,
  53         ACTION_DUMP_CONFIGURATION_ITEMS,
  54         ACTION_DONE
  55 } arg_action = ACTION_RUN;
  56
  57 static char *arg_default_unit = NULL;
  58 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  59
  60 static bool arg_dump_core = true;
  61 static bool arg_crash_shell = false;
  62 static int arg_crash_chvt = -1;
  63 static bool arg_confirm_spawn = false;
  64 static bool arg_nomodules = false;
  65 static bool arg_show_status = true;
  66
  67 static FILE* serialization = NULL;
  68
  69 _noreturn_ static void freeze(void) {
  70         for (;;)
  71                 pause();
  72 }
  73
  74 static void nop_handler(int sig) {
  75 }
  76
  77 _noreturn_ static void crash(int sig) {
  78
  79         if (!arg_dump_core)
  80                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  81         else {
  82                 struct sigaction sa;
  83                 pid_t pid;
  84
  85                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  86                 zero(sa);
  87                 sa.sa_handler = nop_handler;
  88                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  89                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  90
  91                 if ((pid = fork()) < 0)
  92                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  93
  94                 else if (pid == 0) {
  95                         struct rlimit rl;
  96
  97                         /* Enable default signal handler for core dump */
  98                         zero(sa);
  99                         sa.sa_handler = SIG_DFL;
 100                         assert_se(sigaction(sig, &sa, NULL) == 0);
 101
 102                         /* Don't limit the core dump size */
 103                         zero(rl);
 104                         rl.rlim_cur = RLIM_INFINITY;
 105                         rl.rlim_max = RLIM_INFINITY;
 106                         setrlimit(RLIMIT_CORE, &rl);
 107
 108                         /* Just to be sure... */
 109                         assert_se(chdir("/") == 0);
 110
 111                         /* Raise the signal again */
 112                         raise(sig);
 113
 114                         assert_not_reached("We shouldn't be here...");
 115                         _exit(1);
 116
 117                 } else {
 118                         int status, r;
 119
 120                         /* Order things nicely. */
 121                         if ((r = waitpid(pid, &status, 0)) < 0)
 122                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(errno));
 123                         else if (!WCOREDUMP(status))
 124                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 125                         else
 126                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 127                 }
 128         }
 129
 130         if (arg_crash_chvt)
 131                 chvt(arg_crash_chvt);
 132
 133         if (arg_crash_shell) {
 134                 struct sigaction sa;
 135                 pid_t pid;
 136
 137                 log_info("Executing crash shell in 10s...");
 138                 sleep(10);
 139
 140                 /* Let the kernel reap children for us */
 141                 zero(sa);
 142                 sa.sa_handler = SIG_IGN;
 143                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 144                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 145
 146                 if ((pid = fork()) < 0)
 147                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 148                 else if (pid == 0) {
 149                         int fd, r;
 150
 151                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 152                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 153                         else if ((r = make_stdio(fd)) < 0)
 154                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 155
 156                         execl("/bin/sh", "/bin/sh", NULL);
 157
 158                         log_error("execl() failed: %s", strerror(errno));
 159                         _exit(1);
 160                 }
 161
 162                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 163         }
 164
 165         log_info("Freezing execution.");
 166         freeze();
 167 }
 168
 169 static void install_crash_handler(void) {
 170         struct sigaction sa;
 171
 172         zero(sa);
 173
 174         sa.sa_handler = crash;
 175         sa.sa_flags = SA_NODEFER;
 176
 177         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 178 }
 179
 180 static int make_null_stdio(void) {
 181         int null_fd, r;
 182
 183         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 184                 log_error("Failed to open /dev/null: %m");
 185                 return -errno;
 186         }
 187
 188         if ((r = make_stdio(null_fd)) < 0)
 189                 log_warning("Failed to dup2() device: %s", strerror(-r));
 190
 191         return r;
 192 }
 193
 194 static int console_setup(bool do_reset) {
 195         int tty_fd, r;
 196
 197         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 198          * and make sure we don't have a controlling tty. */
 199
 200         release_terminal();
 201
 202         if (!do_reset)
 203                 return 0;
 204
 205         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 206                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 207                 return -tty_fd;
 208         }
 209
 210         if ((r = reset_terminal(tty_fd)) < 0)
 211                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 212
 213         close_nointr_nofail(tty_fd);
 214         return r;
 215 }
 216
 217 static int set_default_unit(const char *u) {
 218         char *c;
 219
 220         assert(u);
 221
 222         if (!(c = strdup(u)))
 223                 return -ENOMEM;
 224
 225         free(arg_default_unit);
 226         arg_default_unit = c;
 227         return 0;
 228 }
 229
 230 static int parse_proc_cmdline_word(const char *word) {
 231
 232         static const char * const rlmap[] = {
 233                 "single", SPECIAL_RESCUE_TARGET,
 234                 "-s",     SPECIAL_RESCUE_TARGET,
 235                 "s",      SPECIAL_RESCUE_TARGET,
 236                 "S",      SPECIAL_RESCUE_TARGET,
 237                 "1",      SPECIAL_RESCUE_TARGET,
 238                 "2",      SPECIAL_RUNLEVEL2_TARGET,
 239                 "3",      SPECIAL_RUNLEVEL3_TARGET,
 240                 "4",      SPECIAL_RUNLEVEL4_TARGET,
 241                 "5",      SPECIAL_RUNLEVEL5_TARGET
 242         };
 243         bool ignore_quiet = false;
 244
 245         if (startswith(word, "systemd.unit="))
 246                 return set_default_unit(word + 13);
 247
 248         else if (startswith(word, "systemd.log_target=")) {
 249
 250                 if (log_set_target_from_string(word + 19) < 0)
 251                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 252
 253         } else if (startswith(word, "systemd.log_level=")) {
 254
 255                 if (log_set_max_level_from_string(word + 18) < 0)
 256                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 257
 258         } else if (startswith(word, "systemd.log_color=")) {
 259
 260                 if (log_show_color_from_string(word + 18) < 0)
 261                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 262
 263         } else if (startswith(word, "systemd.log_location=")) {
 264
 265                 if (log_show_location_from_string(word + 21) < 0)
 266                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 267
 268         } else if (startswith(word, "systemd.dump_core=")) {
 269                 int r;
 270
 271                 if ((r = parse_boolean(word + 18)) < 0)
 272                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 273                 else
 274                         arg_dump_core = r;
 275
 276         } else if (startswith(word, "systemd.crash_shell=")) {
 277                 int r;
 278
 279                 if ((r = parse_boolean(word + 20)) < 0)
 280                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 281                 else
 282                         arg_crash_shell = r;
 283
 284         } else if (startswith(word, "systemd.confirm_spawn=")) {
 285                 int r;
 286
 287                 if ((r = parse_boolean(word + 22)) < 0)
 288                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 289                 else
 290                         arg_confirm_spawn = r;
 291
 292         } else if (startswith(word, "systemd.crash_chvt=")) {
 293                 int k;
 294
 295                 if (safe_atoi(word + 19, &k) < 0)
 296                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 297                 else
 298                         arg_crash_chvt = k;
 299
 300         } else if (startswith(word, "systemd.show_status=")) {
 301                 int r;
 302
 303                 if ((r = parse_boolean(word + 20)) < 0)
 304                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 305                 else {
 306                         arg_show_status = r;
 307                         ignore_quiet = true;
 308                 }
 309
 310         } else if (startswith(word, "systemd.")) {
 311
 312                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 313
 314                 log_info("Supported kernel switches:\n"
 315                          "systemd.unit=UNIT                        Default unit to start\n"
 316                          "systemd.log_target=console|kmsg|syslog|  Log target\n"
 317                          "                   syslog-org-kmsg|null\n"
 318                          "systemd.log_level=LEVEL                  Log level\n"
 319                          "systemd.log_color=0|1                    Highlight important log messages\n"
 320                          "systemd.log_location=0|1                 Include code location in log messages\n"
 321                          "systemd.dump_core=0|1                    Dump core on crash\n"
 322                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 323                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 324                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 325                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n");
 326
 327         } else if (streq(word, "nomodules"))
 328                 arg_nomodules = true;
 329         else if (streq(word, "quiet")) {
 330                 if (!ignore_quiet)
 331                         arg_show_status = false;
 332         } else {
 333                 unsigned i;
 334
 335                 /* SysV compatibility */
 336                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 337                         if (streq(word, rlmap[i]))
 338                                 return set_default_unit(rlmap[i+1]);
 339         }
 340
 341         return 0;
 342 }
 343
 344 static int config_parse_level(
 345                 const char *filename,
 346                 unsigned line,
 347                 const char *section,
 348                 const char *lvalue,
 349                 const char *rvalue,
 350                 void *data,
 351                 void *userdata) {
 352
 353         assert(filename);
 354         assert(lvalue);
 355         assert(rvalue);
 356
 357         log_set_max_level_from_string(rvalue);
 358         return 0;
 359 }
 360
 361 static int config_parse_target(
 362                 const char *filename,
 363                 unsigned line,
 364                 const char *section,
 365                 const char *lvalue,
 366                 const char *rvalue,
 367                 void *data,
 368                 void *userdata) {
 369
 370         assert(filename);
 371         assert(lvalue);
 372         assert(rvalue);
 373
 374         log_set_target_from_string(rvalue);
 375         return 0;
 376 }
 377
 378 static int config_parse_color(
 379                 const char *filename,
 380                 unsigned line,
 381                 const char *section,
 382                 const char *lvalue,
 383                 const char *rvalue,
 384                 void *data,
 385                 void *userdata) {
 386
 387         assert(filename);
 388         assert(lvalue);
 389         assert(rvalue);
 390
 391         log_show_color_from_string(rvalue);
 392         return 0;
 393 }
 394
 395 static int config_parse_location(
 396                 const char *filename,
 397                 unsigned line,
 398                 const char *section,
 399                 const char *lvalue,
 400                 const char *rvalue,
 401                 void *data,
 402                 void *userdata) {
 403
 404         assert(filename);
 405         assert(lvalue);
 406         assert(rvalue);
 407
 408         log_show_location_from_string(rvalue);
 409         return 0;
 410 }
 411
 412 static int config_parse_cpu_affinity(
 413                 const char *filename,
 414                 unsigned line,
 415                 const char *section,
 416                 const char *lvalue,
 417                 const char *rvalue,
 418                 void *data,
 419                 void *userdata) {
 420
 421         char *w;
 422         size_t l;
 423         char *state;
 424         cpu_set_t *c = NULL;
 425         unsigned ncpus = 0;
 426
 427         assert(filename);
 428         assert(lvalue);
 429         assert(rvalue);
 430
 431         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 432                 char *t;
 433                 int r;
 434                 unsigned cpu;
 435
 436                 if (!(t = strndup(w, l)))
 437                         return -ENOMEM;
 438
 439                 r = safe_atou(t, &cpu);
 440                 free(t);
 441
 442                 if (!c)
 443                         if (!(c = cpu_set_malloc(&ncpus)))
 444                                 return -ENOMEM;
 445
 446                 if (r < 0 || cpu >= ncpus) {
 447                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 448                         CPU_FREE(c);
 449                         return -EBADMSG;
 450                 }
 451
 452                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 453         }
 454
 455         if (c) {
 456                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 457                         log_warning("Failed to set CPU affinity: %m");
 458
 459                 CPU_FREE(c);
 460         }
 461
 462         return 0;
 463 }
 464
 465 static int parse_config_file(void) {
 466
 467         const ConfigItem items[] = {
 468                 { "LogLevel",    config_parse_level,        NULL,             "Manager" },
 469                 { "LogTarget",   config_parse_target,       NULL,             "Manager" },
 470                 { "LogColor",    config_parse_color,        NULL,             "Manager" },
 471                 { "LogLocation", config_parse_location,     NULL,             "Manager" },
 472                 { "DumpCore",    config_parse_bool,         &arg_dump_core,   "Manager" },
 473                 { "CrashShell",  config_parse_bool,         &arg_crash_shell, "Manager" },
 474                 { "ShowStatus",  config_parse_bool,         &arg_show_status, "Manager" },
 475                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,  "Manager" },
 476                 { "CPUAffinity", config_parse_cpu_affinity, NULL,             "Manager" },
 477                 { NULL, NULL, NULL, NULL }
 478         };
 479
 480         static const char * const sections[] = {
 481                 "Manager",
 482                 NULL
 483         };
 484
 485         FILE *f;
 486         const char *fn;
 487         int r;
 488
 489         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 490
 491         if (!(f = fopen(fn, "re"))) {
 492                 if (errno == ENOENT)
 493                         return 0;
 494
 495                 log_warning("Failed to open configuration file '%s': %m", fn);
 496                 return 0;
 497         }
 498
 499         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 500                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 501
 502         fclose(f);
 503
 504         return 0;
 505 }
 506
 507 static int parse_proc_cmdline(void) {
 508         char *line;
 509         int r;
 510         char *w;
 511         size_t l;
 512         char *state;
 513
 514         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 515                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
 516                 return 0;
 517         }
 518
 519         FOREACH_WORD_QUOTED(w, l, line, state) {
 520                 char *word;
 521
 522                 if (!(word = strndup(w, l))) {
 523                         r = -ENOMEM;
 524                         goto finish;
 525                 }
 526
 527                 r = parse_proc_cmdline_word(word);
 528                 free(word);
 529
 530                 if (r < 0)
 531                         goto finish;
 532         }
 533
 534         r = 0;
 535
 536 finish:
 537         free(line);
 538         return r;
 539 }
 540
 541 static int parse_argv(int argc, char *argv[]) {
 542
 543         enum {
 544                 ARG_LOG_LEVEL = 0x100,
 545                 ARG_LOG_TARGET,
 546                 ARG_LOG_COLOR,
 547                 ARG_LOG_LOCATION,
 548                 ARG_UNIT,
 549                 ARG_SYSTEM,
 550                 ARG_SESSION,
 551                 ARG_TEST,
 552                 ARG_DUMP_CONFIGURATION_ITEMS,
 553                 ARG_DUMP_CORE,
 554                 ARG_CRASH_SHELL,
 555                 ARG_CONFIRM_SPAWN,
 556                 ARG_SHOW_STATUS,
 557                 ARG_DESERIALIZE,
 558                 ARG_INTROSPECT
 559         };
 560
 561         static const struct option options[] = {
 562                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 563                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 564                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 565                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 566                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 567                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 568                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 569                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 570                 { "help",                     no_argument,       NULL, 'h'                          },
 571                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 572                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 573                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 574                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 575                 { "show-status",              no_argument,       NULL, ARG_SHOW_STATUS              },
 576                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 577                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 578                 { NULL,                       0,                 NULL, 0                            }
 579         };
 580
 581         int c, r;
 582
 583         assert(argc >= 1);
 584         assert(argv);
 585
 586         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 587
 588                 switch (c) {
 589
 590                 case ARG_LOG_LEVEL:
 591                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 592                                 log_error("Failed to parse log level %s.", optarg);
 593                                 return r;
 594                         }
 595
 596                         break;
 597
 598                 case ARG_LOG_TARGET:
 599
 600                         if ((r = log_set_target_from_string(optarg)) < 0) {
 601                                 log_error("Failed to parse log target %s.", optarg);
 602                                 return r;
 603                         }
 604
 605                         break;
 606
 607                 case ARG_LOG_COLOR:
 608
 609                         if (optarg) {
 610                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 611                                         log_error("Failed to parse log color setting %s.", optarg);
 612                                         return r;
 613                                 }
 614                         } else
 615                                 log_show_color(true);
 616
 617                         break;
 618
 619                 case ARG_LOG_LOCATION:
 620
 621                         if (optarg) {
 622                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 623                                         log_error("Failed to parse log location setting %s.", optarg);
 624                                         return r;
 625                                 }
 626                         } else
 627                                 log_show_location(true);
 628
 629                         break;
 630
 631                 case ARG_UNIT:
 632
 633                         if ((r = set_default_unit(optarg)) < 0) {
 634                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 635                                 return r;
 636                         }
 637
 638                         break;
 639
 640                 case ARG_SYSTEM:
 641                         arg_running_as = MANAGER_SYSTEM;
 642                         break;
 643
 644                 case ARG_SESSION:
 645                         arg_running_as = MANAGER_SESSION;
 646                         break;
 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 'D':
 720                         log_set_max_level(LOG_DEBUG);
 721                         break;
 722
 723                 case '?':
 724                         return -EINVAL;
 725
 726                 default:
 727                         log_error("Unknown option code %c", c);
 728                         return -EINVAL;
 729                 }
 730
 731         /* PID 1 will get the kernel arguments as parameters, which we
 732          * ignore and unconditionally read from
 733          * /proc/cmdline. However, we need to ignore those arguments
 734          * here. */
 735         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 736                 log_error("Excess arguments.");
 737                 return -EINVAL;
 738         }
 739
 740         return 0;
 741 }
 742
 743 static int help(void) {
 744
 745         printf("%s [OPTIONS...]\n\n"
 746                "Starts up and maintains the system or a session.\n\n"
 747                "  -h --help                      Show this help\n"
 748                "     --test                      Determine startup sequence, dump it and exit\n"
 749                "     --dump-configuration-items  Dump understood unit configuration items\n"
 750                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 751                "     --unit=UNIT                 Set default unit\n"
 752                "     --system                    Run a system instance, even if PID != 1\n"
 753                "     --session                   Run a session instance\n"
 754                "     --dump-core                 Dump core on crash\n"
 755                "     --crash-shell               Run shell on crash\n"
 756                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 757                "     --show-status               Show status updates on the console during bootup\n"
 758                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 759                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 760                "     --log-color[=0|1]           Highlight important log messages\n"
 761                "     --log-location[=0|1]        Include code location in log messages\n",
 762                program_invocation_short_name);
 763
 764         return 0;
 765 }
 766
 767 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 768         FILE *f = NULL;
 769         FDSet *fds = NULL;
 770         int r;
 771
 772         assert(m);
 773         assert(_f);
 774         assert(_fds);
 775
 776         if ((r = manager_open_serialization(&f)) < 0) {
 777                 log_error("Failed to create serialization faile: %s", strerror(-r));
 778                 goto fail;
 779         }
 780
 781         if (!(fds = fdset_new())) {
 782                 r = -ENOMEM;
 783                 log_error("Failed to allocate fd set: %s", strerror(-r));
 784                 goto fail;
 785         }
 786
 787         if ((r = manager_serialize(m, f, fds)) < 0) {
 788                 log_error("Failed to serialize state: %s", strerror(-r));
 789                 goto fail;
 790         }
 791
 792         if (fseeko(f, 0, SEEK_SET) < 0) {
 793                 log_error("Failed to rewind serialization fd: %m");
 794                 goto fail;
 795         }
 796
 797         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 798                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 799                 goto fail;
 800         }
 801
 802         if ((r = fdset_cloexec(fds, false)) < 0) {
 803                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 804                 goto fail;
 805         }
 806
 807         *_f = f;
 808         *_fds = fds;
 809
 810         return 0;
 811
 812 fail:
 813         fdset_free(fds);
 814
 815         if (f)
 816                 fclose(f);
 817
 818         return r;
 819 }
 820
 821 int main(int argc, char *argv[]) {
 822         Manager *m = NULL;
 823         Unit *target = NULL;
 824         Job *job = NULL;
 825         int r, retval = 1;
 826         FDSet *fds = NULL;
 827         bool reexecute = false;
 828
 829         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 830                 /* This is compatbility support for SysV, where
 831                  * calling init as a user is identical to telinit. */
 832
 833                 errno = -ENOENT;
 834                 execv(SYSTEMCTL_BINARY_PATH, argv);
 835                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 836                 return 1;
 837         }
 838
 839         log_show_color(true);
 840         log_show_location(false);
 841         log_set_max_level(LOG_INFO);
 842
 843         if (getpid() == 1) {
 844                 arg_running_as = MANAGER_SYSTEM;
 845                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 846         } else {
 847                 arg_running_as = MANAGER_SESSION;
 848                 log_set_target(LOG_TARGET_CONSOLE);
 849         }
 850
 851         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 852                 goto finish;
 853
 854         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 855          * /proc/$PID/fd is available. */
 856         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 857                 if (mount_setup() < 0)
 858                         goto finish;
 859
 860         /* Reset all signal handlers. */
 861         assert_se(reset_all_signal_handlers() == 0);
 862
 863         /* If we are init, we can block sigkill. Yay. */
 864         ignore_signals(SIGNALS_IGNORE, -1);
 865
 866         if (parse_config_file() < 0)
 867                 goto finish;
 868
 869         if (arg_running_as == MANAGER_SYSTEM)
 870                 if (parse_proc_cmdline() < 0)
 871                         goto finish;
 872
 873         log_parse_environment();
 874
 875         if (parse_argv(argc, argv) < 0)
 876                 goto finish;
 877
 878         if (arg_action == ACTION_HELP) {
 879                 retval = help();
 880                 goto finish;
 881         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 882                 unit_dump_config_items(stdout);
 883                 retval = 0;
 884                 goto finish;
 885         } else if (arg_action == ACTION_DONE) {
 886                 retval = 0;
 887                 goto finish;
 888         }
 889
 890         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 891
 892         /* Remember open file descriptors for later deserialization */
 893         if (serialization) {
 894                 if ((r = fdset_new_fill(&fds)) < 0) {
 895                         log_error("Failed to allocate fd set: %s", strerror(-r));
 896                         goto finish;
 897                 }
 898
 899                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 900         } else
 901                 close_all_fds(NULL, 0);
 902
 903         /* Set up PATH unless it is already set */
 904         setenv("PATH",
 905                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 906                arg_running_as == MANAGER_SYSTEM);
 907
 908         /* Move out of the way, so that we won't block unmounts */
 909         assert_se(chdir("/")  == 0);
 910
 911         if (arg_running_as == MANAGER_SYSTEM) {
 912                 /* Become a session leader if we aren't one yet. */
 913                 setsid();
 914
 915                 /* Disable the umask logic */
 916                 umask(0);
 917         }
 918
 919         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 920         dbus_connection_set_change_sigpipe(FALSE);
 921
 922         /* Reset the console, but only if this is really init and we
 923          * are freshly booted */
 924         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 925                 console_setup(getpid() == 1 && !serialization);
 926                 make_null_stdio();
 927         }
 928
 929         /* Open the logging devices, if possible and necessary */
 930         log_open();
 931
 932         /* Make sure we leave a core dump without panicing the
 933          * kernel. */
 934         if (getpid() == 1)
 935                 install_crash_handler();
 936
 937         log_info(PACKAGE_STRING " running in %s mode.", manager_running_as_to_string(arg_running_as));
 938
 939         if (arg_running_as == MANAGER_SYSTEM) {
 940
 941                 /* Disable nscd, to avoid deadlocks when systemd uses
 942                  * NSS and the nscd socket is maintained by us. */
 943                 if (nss_disable_nscd) {
 944                         log_debug("Disabling nscd");
 945                         nss_disable_nscd();
 946                 } else
 947                         log_debug("Hmm, can't disable nscd.");
 948
 949                 if (!serialization) {
 950                         if (arg_show_status)
 951                                 status_welcome();
 952                         modprobe_setup(arg_nomodules);
 953                         kmod_setup();
 954                         hostname_setup();
 955                         loopback_setup();
 956                 }
 957         }
 958
 959         if ((r = manager_new(arg_running_as, &m)) < 0) {
 960                 log_error("Failed to allocate manager object: %s", strerror(-r));
 961                 goto finish;
 962         }
 963
 964         m->confirm_spawn = arg_confirm_spawn;
 965         m->show_status = arg_show_status;
 966
 967         if ((r = manager_startup(m, serialization, fds)) < 0)
 968                 log_error("Failed to fully start up daemon: %s", strerror(-r));
 969
 970         if (fds) {
 971                 /* This will close all file descriptors that were opened, but
 972                  * not claimed by any unit. */
 973
 974                 fdset_free(fds);
 975                 fds = NULL;
 976         }
 977
 978         if (serialization) {
 979                 fclose(serialization);
 980                 serialization = NULL;
 981         } else {
 982                 DBusError error;
 983
 984                 dbus_error_init(&error);
 985
 986                 log_debug("Activating default unit: %s", arg_default_unit);
 987
 988                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
 989                         log_error("Failed to load default target: %s", bus_error(&error, r));
 990                         dbus_error_free(&error);
 991
 992                         log_info("Trying to load rescue target...");
 993                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
 994                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
 995                                 dbus_error_free(&error);
 996                                 goto finish;
 997                         }
 998                 }
 999
1000                 if (arg_action == ACTION_TEST) {
1001                         printf("-> By units:\n");
1002                         manager_dump_units(m, stdout, "\t");
1003                 }
1004
1005                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, &job)) < 0) {
1006                         log_error("Failed to start default target: %s", bus_error(&error, r));
1007                         dbus_error_free(&error);
1008                         goto finish;
1009                 }
1010
1011                 if (arg_action == ACTION_TEST) {
1012                         printf("-> By jobs:\n");
1013                         manager_dump_jobs(m, stdout, "\t");
1014                         retval = 0;
1015                         goto finish;
1016                 }
1017         }
1018
1019         for (;;) {
1020                 if ((r = manager_loop(m)) < 0) {
1021                         log_error("Failed to run mainloop: %s", strerror(-r));
1022                         goto finish;
1023                 }
1024
1025                 switch (m->exit_code) {
1026
1027                 case MANAGER_EXIT:
1028                         retval = 0;
1029                         log_debug("Exit.");
1030                         goto finish;
1031
1032                 case MANAGER_RELOAD:
1033                         log_info("Reloading.");
1034                         if ((r = manager_reload(m)) < 0)
1035                                 log_error("Failed to reload: %s", strerror(-r));
1036                         break;
1037
1038                 case MANAGER_REEXECUTE:
1039                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1040                                 goto finish;
1041
1042                         reexecute = true;
1043                         log_notice("Reexecuting.");
1044                         goto finish;
1045
1046                 default:
1047                         assert_not_reached("Unknown exit code.");
1048                 }
1049         }
1050
1051 finish:
1052         if (m)
1053                 manager_free(m);
1054
1055         free(arg_default_unit);
1056
1057         dbus_shutdown();
1058
1059         if (reexecute) {
1060                 const char *args[14];
1061                 unsigned i = 0;
1062                 char sfd[16];
1063
1064                 assert(serialization);
1065                 assert(fds);
1066
1067                 args[i++] = SYSTEMD_BINARY_PATH;
1068
1069                 args[i++] = "--log-level";
1070                 args[i++] = log_level_to_string(log_get_max_level());
1071
1072                 args[i++] = "--log-target";
1073                 args[i++] = log_target_to_string(log_get_target());
1074
1075                 if (arg_running_as == MANAGER_SYSTEM)
1076                         args[i++] = "--system";
1077                 else
1078                         args[i++] = "--session";
1079
1080                 if (arg_dump_core)
1081                         args[i++] = "--dump-core";
1082
1083                 if (arg_crash_shell)
1084                         args[i++] = "--crash-shell";
1085
1086                 if (arg_confirm_spawn)
1087                         args[i++] = "--confirm-spawn";
1088
1089                 if (arg_show_status)
1090                         args[i++] = "--show-status";
1091
1092                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1093                 char_array_0(sfd);
1094
1095                 args[i++] = "--deserialize";
1096                 args[i++] = sfd;
1097
1098                 args[i++] = NULL;
1099
1100                 assert(i <= ELEMENTSOF(args));
1101
1102                 execv(args[0], (char* const*) args);
1103
1104                 log_error("Failed to reexecute: %m");
1105         }
1106
1107         if (serialization)
1108                 fclose(serialization);
1109
1110         if (fds)
1111                 fdset_free(fds);
1112
1113         if (getpid() == 1)
1114                 freeze();
1115
1116         return retval;
1117 }