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 char *arg_console = NULL;
  59 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  60
  61 static bool arg_dump_core = true;
  62 static bool arg_crash_shell = false;
  63 static int arg_crash_chvt = -1;
  64 static bool arg_confirm_spawn = false;
  65 static bool arg_nomodules = false;
  66 static bool arg_show_status = true;
  67
  68 static FILE* serialization = NULL;
  69
  70 _noreturn_ static void freeze(void) {
  71         for (;;)
  72                 pause();
  73 }
  74
  75 static void nop_handler(int sig) {
  76 }
  77
  78 _noreturn_ static void crash(int sig) {
  79
  80         if (!arg_dump_core)
  81                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  82         else {
  83                 struct sigaction sa;
  84                 pid_t pid;
  85
  86                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  87                 zero(sa);
  88                 sa.sa_handler = nop_handler;
  89                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  90                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  91
  92                 if ((pid = fork()) < 0)
  93                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  94
  95                 else if (pid == 0) {
  96                         struct rlimit rl;
  97
  98                         /* Enable default signal handler for core dump */
  99                         zero(sa);
 100                         sa.sa_handler = SIG_DFL;
 101                         assert_se(sigaction(sig, &sa, NULL) == 0);
 102
 103                         /* Don't limit the core dump size */
 104                         zero(rl);
 105                         rl.rlim_cur = RLIM_INFINITY;
 106                         rl.rlim_max = RLIM_INFINITY;
 107                         setrlimit(RLIMIT_CORE, &rl);
 108
 109                         /* Just to be sure... */
 110                         assert_se(chdir("/") == 0);
 111
 112                         /* Raise the signal again */
 113                         raise(sig);
 114
 115                         assert_not_reached("We shouldn't be here...");
 116                         _exit(1);
 117
 118                 } else {
 119                         int status, r;
 120
 121                         /* Order things nicely. */
 122                         if ((r = waitpid(pid, &status, 0)) < 0)
 123                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(errno));
 124                         else if (!WCOREDUMP(status))
 125                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 126                         else
 127                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 128                 }
 129         }
 130
 131         if (arg_crash_chvt)
 132                 chvt(arg_crash_chvt);
 133
 134         if (arg_crash_shell) {
 135                 struct sigaction sa;
 136                 pid_t pid;
 137
 138                 log_info("Executing crash shell in 10s...");
 139                 sleep(10);
 140
 141                 /* Let the kernel reap children for us */
 142                 zero(sa);
 143                 sa.sa_handler = SIG_IGN;
 144                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 145                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 146
 147                 if ((pid = fork()) < 0)
 148                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 149                 else if (pid == 0) {
 150                         int fd, r;
 151
 152                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 153                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 154                         else if ((r = make_stdio(fd)) < 0)
 155                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 156
 157                         execl("/bin/sh", "/bin/sh", NULL);
 158
 159                         log_error("execl() failed: %s", strerror(errno));
 160                         _exit(1);
 161                 }
 162
 163                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 164         }
 165
 166         log_info("Freezing execution.");
 167         freeze();
 168 }
 169
 170 static void install_crash_handler(void) {
 171         struct sigaction sa;
 172
 173         zero(sa);
 174
 175         sa.sa_handler = crash;
 176         sa.sa_flags = SA_NODEFER;
 177
 178         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 179 }
 180
 181 static int make_null_stdio(void) {
 182         int null_fd, r;
 183
 184         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 185                 log_error("Failed to open /dev/null: %m");
 186                 return -errno;
 187         }
 188
 189         if ((r = make_stdio(null_fd)) < 0)
 190                 log_warning("Failed to dup2() device: %s", strerror(-r));
 191
 192         return r;
 193 }
 194
 195 static int console_setup(bool do_reset) {
 196         int tty_fd, r;
 197
 198         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 199          * and make sure we don't have a controlling tty. */
 200
 201         release_terminal();
 202
 203         if (!do_reset)
 204                 return 0;
 205
 206         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 207                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 208                 return -tty_fd;
 209         }
 210
 211         if ((r = reset_terminal(tty_fd)) < 0)
 212                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 213
 214         close_nointr_nofail(tty_fd);
 215         return r;
 216 }
 217
 218 static int set_default_unit(const char *u) {
 219         char *c;
 220
 221         assert(u);
 222
 223         if (!(c = strdup(u)))
 224                 return -ENOMEM;
 225
 226         free(arg_default_unit);
 227         arg_default_unit = c;
 228         return 0;
 229 }
 230
 231 static int parse_proc_cmdline_word(const char *word) {
 232
 233         static const char * const rlmap[] = {
 234                 "single", SPECIAL_RESCUE_TARGET,
 235                 "-s",     SPECIAL_RESCUE_TARGET,
 236                 "s",      SPECIAL_RESCUE_TARGET,
 237                 "S",      SPECIAL_RESCUE_TARGET,
 238                 "1",      SPECIAL_RESCUE_TARGET,
 239                 "2",      SPECIAL_RUNLEVEL2_TARGET,
 240                 "3",      SPECIAL_RUNLEVEL3_TARGET,
 241                 "4",      SPECIAL_RUNLEVEL4_TARGET,
 242                 "5",      SPECIAL_RUNLEVEL5_TARGET
 243         };
 244         bool ignore_quiet = false;
 245
 246         if (startswith(word, "systemd.unit="))
 247                 return set_default_unit(word + 13);
 248
 249         else if (startswith(word, "systemd.log_target=")) {
 250
 251                 if (log_set_target_from_string(word + 19) < 0)
 252                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 253
 254         } else if (startswith(word, "systemd.log_level=")) {
 255
 256                 if (log_set_max_level_from_string(word + 18) < 0)
 257                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 258
 259         } else if (startswith(word, "systemd.log_color=")) {
 260
 261                 if (log_show_color_from_string(word + 18) < 0)
 262                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 263
 264         } else if (startswith(word, "systemd.log_location=")) {
 265
 266                 if (log_show_location_from_string(word + 21) < 0)
 267                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 268
 269         } else if (startswith(word, "systemd.dump_core=")) {
 270                 int r;
 271
 272                 if ((r = parse_boolean(word + 18)) < 0)
 273                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 274                 else
 275                         arg_dump_core = r;
 276
 277         } else if (startswith(word, "systemd.crash_shell=")) {
 278                 int r;
 279
 280                 if ((r = parse_boolean(word + 20)) < 0)
 281                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 282                 else
 283                         arg_crash_shell = r;
 284
 285         } else if (startswith(word, "systemd.confirm_spawn=")) {
 286                 int r;
 287
 288                 if ((r = parse_boolean(word + 22)) < 0)
 289                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 290                 else
 291                         arg_confirm_spawn = r;
 292
 293         } else if (startswith(word, "systemd.crash_chvt=")) {
 294                 int k;
 295
 296                 if (safe_atoi(word + 19, &k) < 0)
 297                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 298                 else
 299                         arg_crash_chvt = k;
 300
 301         } else if (startswith(word, "systemd.show_status=")) {
 302                 int r;
 303
 304                 if ((r = parse_boolean(word + 20)) < 0)
 305                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 306                 else {
 307                         arg_show_status = r;
 308                         ignore_quiet = true;
 309                 }
 310
 311         } else if (startswith(word, "systemd.")) {
 312
 313                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 314
 315                 log_info("Supported kernel switches:\n"
 316                          "systemd.unit=UNIT                        Default unit to start\n"
 317                          "systemd.log_target=console|kmsg|syslog|  Log target\n"
 318                          "                   syslog-org-kmsg|null\n"
 319                          "systemd.log_level=LEVEL                  Log level\n"
 320                          "systemd.log_color=0|1                    Highlight important log messages\n"
 321                          "systemd.log_location=0|1                 Include code location in log messages\n"
 322                          "systemd.dump_core=0|1                    Dump core on crash\n"
 323                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 324                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 325                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 326                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n");
 327
 328         } else if (streq(word, "nomodules"))
 329                 arg_nomodules = true;
 330         else if (startswith(word, "console=")) {
 331                 const char *k;
 332                 size_t l;
 333                 char *w = NULL;
 334
 335                 k = word + 8;
 336                 l = strcspn(k, ",");
 337
 338                 if (l < 4 ||
 339                     !startswith(k, "tty") ||
 340                     k[3+strspn(k+3, "0123456789")] != 0) {
 341
 342                         if (!(w = strndup(k, l)))
 343                                 return -ENOMEM;
 344                 }
 345
 346                 free(arg_console);
 347                 arg_console = w;
 348
 349         } else if (streq(word, "quiet")) {
 350                 if (!ignore_quiet)
 351                         arg_show_status = false;
 352         } else {
 353                 unsigned i;
 354
 355                 /* SysV compatibility */
 356                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 357                         if (streq(word, rlmap[i]))
 358                                 return set_default_unit(rlmap[i+1]);
 359         }
 360
 361         return 0;
 362 }
 363
 364 static int config_parse_level(
 365                 const char *filename,
 366                 unsigned line,
 367                 const char *section,
 368                 const char *lvalue,
 369                 const char *rvalue,
 370                 void *data,
 371                 void *userdata) {
 372
 373         assert(filename);
 374         assert(lvalue);
 375         assert(rvalue);
 376
 377         log_set_max_level_from_string(rvalue);
 378         return 0;
 379 }
 380
 381 static int config_parse_target(
 382                 const char *filename,
 383                 unsigned line,
 384                 const char *section,
 385                 const char *lvalue,
 386                 const char *rvalue,
 387                 void *data,
 388                 void *userdata) {
 389
 390         assert(filename);
 391         assert(lvalue);
 392         assert(rvalue);
 393
 394         log_set_target_from_string(rvalue);
 395         return 0;
 396 }
 397
 398 static int config_parse_color(
 399                 const char *filename,
 400                 unsigned line,
 401                 const char *section,
 402                 const char *lvalue,
 403                 const char *rvalue,
 404                 void *data,
 405                 void *userdata) {
 406
 407         assert(filename);
 408         assert(lvalue);
 409         assert(rvalue);
 410
 411         log_show_color_from_string(rvalue);
 412         return 0;
 413 }
 414
 415 static int config_parse_location(
 416                 const char *filename,
 417                 unsigned line,
 418                 const char *section,
 419                 const char *lvalue,
 420                 const char *rvalue,
 421                 void *data,
 422                 void *userdata) {
 423
 424         assert(filename);
 425         assert(lvalue);
 426         assert(rvalue);
 427
 428         log_show_location_from_string(rvalue);
 429         return 0;
 430 }
 431
 432 static int config_parse_cpu_affinity(
 433                 const char *filename,
 434                 unsigned line,
 435                 const char *section,
 436                 const char *lvalue,
 437                 const char *rvalue,
 438                 void *data,
 439                 void *userdata) {
 440
 441         char *w;
 442         size_t l;
 443         char *state;
 444         cpu_set_t *c = NULL;
 445         unsigned ncpus = 0;
 446
 447         assert(filename);
 448         assert(lvalue);
 449         assert(rvalue);
 450
 451         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 452                 char *t;
 453                 int r;
 454                 unsigned cpu;
 455
 456                 if (!(t = strndup(w, l)))
 457                         return -ENOMEM;
 458
 459                 r = safe_atou(t, &cpu);
 460                 free(t);
 461
 462                 if (!c)
 463                         if (!(c = cpu_set_malloc(&ncpus)))
 464                                 return -ENOMEM;
 465
 466                 if (r < 0 || cpu >= ncpus) {
 467                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 468                         CPU_FREE(c);
 469                         return -EBADMSG;
 470                 }
 471
 472                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 473         }
 474
 475         if (c) {
 476                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 477                         log_warning("Failed to set CPU affinity: %m");
 478
 479                 CPU_FREE(c);
 480         }
 481
 482         return 0;
 483 }
 484
 485 static int parse_config_file(void) {
 486
 487         const ConfigItem items[] = {
 488                 { "LogLevel",    config_parse_level,        NULL,             "Manager" },
 489                 { "LogTarget",   config_parse_target,       NULL,             "Manager" },
 490                 { "LogColor",    config_parse_color,        NULL,             "Manager" },
 491                 { "LogLocation", config_parse_location,     NULL,             "Manager" },
 492                 { "DumpCore",    config_parse_bool,         &arg_dump_core,   "Manager" },
 493                 { "CrashShell",  config_parse_bool,         &arg_crash_shell, "Manager" },
 494                 { "ShowStatus",  config_parse_bool,         &arg_show_status, "Manager" },
 495                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,  "Manager" },
 496                 { "CPUAffinity", config_parse_cpu_affinity, NULL,             "Manager" },
 497                 { NULL, NULL, NULL, NULL }
 498         };
 499
 500         static const char * const sections[] = {
 501                 "Manager",
 502                 NULL
 503         };
 504
 505         FILE *f;
 506         const char *fn;
 507         int r;
 508
 509         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 510
 511         if (!(f = fopen(fn, "re"))) {
 512                 if (errno == ENOENT)
 513                         return 0;
 514
 515                 log_warning("Failed to open configuration file '%s': %m", fn);
 516                 return 0;
 517         }
 518
 519         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 520                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 521
 522         fclose(f);
 523
 524         return 0;
 525 }
 526
 527 static int parse_proc_cmdline(void) {
 528         char *line;
 529         int r;
 530         char *w;
 531         size_t l;
 532         char *state;
 533
 534         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 535                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
 536                 return 0;
 537         }
 538
 539         FOREACH_WORD_QUOTED(w, l, line, state) {
 540                 char *word;
 541
 542                 if (!(word = strndup(w, l))) {
 543                         r = -ENOMEM;
 544                         goto finish;
 545                 }
 546
 547                 r = parse_proc_cmdline_word(word);
 548                 free(word);
 549
 550                 if (r < 0)
 551                         goto finish;
 552         }
 553
 554         r = 0;
 555
 556 finish:
 557         free(line);
 558         return r;
 559 }
 560
 561 static int parse_argv(int argc, char *argv[]) {
 562
 563         enum {
 564                 ARG_LOG_LEVEL = 0x100,
 565                 ARG_LOG_TARGET,
 566                 ARG_LOG_COLOR,
 567                 ARG_LOG_LOCATION,
 568                 ARG_UNIT,
 569                 ARG_SYSTEM,
 570                 ARG_SESSION,
 571                 ARG_TEST,
 572                 ARG_DUMP_CONFIGURATION_ITEMS,
 573                 ARG_DUMP_CORE,
 574                 ARG_CRASH_SHELL,
 575                 ARG_CONFIRM_SPAWN,
 576                 ARG_SHOW_STATUS,
 577                 ARG_DESERIALIZE,
 578                 ARG_INTROSPECT
 579         };
 580
 581         static const struct option options[] = {
 582                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 583                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 584                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 585                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 586                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 587                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 588                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 589                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 590                 { "help",                     no_argument,       NULL, 'h'                          },
 591                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 592                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 593                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 594                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 595                 { "show-status",              no_argument,       NULL, ARG_SHOW_STATUS              },
 596                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 597                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 598                 { NULL,                       0,                 NULL, 0                            }
 599         };
 600
 601         int c, r;
 602
 603         assert(argc >= 1);
 604         assert(argv);
 605
 606         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 607
 608                 switch (c) {
 609
 610                 case ARG_LOG_LEVEL:
 611                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 612                                 log_error("Failed to parse log level %s.", optarg);
 613                                 return r;
 614                         }
 615
 616                         break;
 617
 618                 case ARG_LOG_TARGET:
 619
 620                         if ((r = log_set_target_from_string(optarg)) < 0) {
 621                                 log_error("Failed to parse log target %s.", optarg);
 622                                 return r;
 623                         }
 624
 625                         break;
 626
 627                 case ARG_LOG_COLOR:
 628
 629                         if (optarg) {
 630                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 631                                         log_error("Failed to parse log color setting %s.", optarg);
 632                                         return r;
 633                                 }
 634                         } else
 635                                 log_show_color(true);
 636
 637                         break;
 638
 639                 case ARG_LOG_LOCATION:
 640
 641                         if (optarg) {
 642                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 643                                         log_error("Failed to parse log location setting %s.", optarg);
 644                                         return r;
 645                                 }
 646                         } else
 647                                 log_show_location(true);
 648
 649                         break;
 650
 651                 case ARG_UNIT:
 652
 653                         if ((r = set_default_unit(optarg)) < 0) {
 654                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 655                                 return r;
 656                         }
 657
 658                         break;
 659
 660                 case ARG_SYSTEM:
 661                         arg_running_as = MANAGER_SYSTEM;
 662                         break;
 663
 664                 case ARG_SESSION:
 665                         arg_running_as = MANAGER_SESSION;
 666                         break;
 667
 668                 case ARG_TEST:
 669                         arg_action = ACTION_TEST;
 670                         break;
 671
 672                 case ARG_DUMP_CONFIGURATION_ITEMS:
 673                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 674                         break;
 675
 676                 case ARG_DUMP_CORE:
 677                         arg_dump_core = true;
 678                         break;
 679
 680                 case ARG_CRASH_SHELL:
 681                         arg_crash_shell = true;
 682                         break;
 683
 684                 case ARG_CONFIRM_SPAWN:
 685                         arg_confirm_spawn = true;
 686                         break;
 687
 688                 case ARG_SHOW_STATUS:
 689                         arg_show_status = true;
 690                         break;
 691
 692                 case ARG_DESERIALIZE: {
 693                         int fd;
 694                         FILE *f;
 695
 696                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 697                                 log_error("Failed to parse deserialize option %s.", optarg);
 698                                 return r;
 699                         }
 700
 701                         if (!(f = fdopen(fd, "r"))) {
 702                                 log_error("Failed to open serialization fd: %m");
 703                                 return r;
 704                         }
 705
 706                         if (serialization)
 707                                 fclose(serialization);
 708
 709                         serialization = f;
 710
 711                         break;
 712                 }
 713
 714                 case ARG_INTROSPECT: {
 715                         const char * const * i = NULL;
 716
 717                         for (i = bus_interface_table; *i; i += 2)
 718                                 if (!optarg || streq(i[0], optarg)) {
 719                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 720                                               "<node>\n", stdout);
 721                                         fputs(i[1], stdout);
 722                                         fputs("</node>\n", stdout);
 723
 724                                         if (optarg)
 725                                                 break;
 726                                 }
 727
 728                         if (!i[0] && optarg)
 729                                 log_error("Unknown interface %s.", optarg);
 730
 731                         arg_action = ACTION_DONE;
 732                         break;
 733                 }
 734
 735                 case 'h':
 736                         arg_action = ACTION_HELP;
 737                         break;
 738
 739                 case 'D':
 740                         log_set_max_level(LOG_DEBUG);
 741                         break;
 742
 743                 case '?':
 744                         return -EINVAL;
 745
 746                 default:
 747                         log_error("Unknown option code %c", c);
 748                         return -EINVAL;
 749                 }
 750
 751         /* PID 1 will get the kernel arguments as parameters, which we
 752          * ignore and unconditionally read from
 753          * /proc/cmdline. However, we need to ignore those arguments
 754          * here. */
 755         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 756                 log_error("Excess arguments.");
 757                 return -EINVAL;
 758         }
 759
 760         return 0;
 761 }
 762
 763 static int help(void) {
 764
 765         printf("%s [OPTIONS...]\n\n"
 766                "Starts up and maintains the system or a session.\n\n"
 767                "  -h --help                      Show this help\n"
 768                "     --test                      Determine startup sequence, dump it and exit\n"
 769                "     --dump-configuration-items  Dump understood unit configuration items\n"
 770                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 771                "     --unit=UNIT                 Set default unit\n"
 772                "     --system                    Run a system instance, even if PID != 1\n"
 773                "     --session                   Run a session instance\n"
 774                "     --dump-core                 Dump core on crash\n"
 775                "     --crash-shell               Run shell on crash\n"
 776                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 777                "     --show-status               Show status updates on the console during bootup\n"
 778                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 779                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 780                "     --log-color[=0|1]           Highlight important log messages\n"
 781                "     --log-location[=0|1]        Include code location in log messages\n",
 782                program_invocation_short_name);
 783
 784         return 0;
 785 }
 786
 787 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 788         FILE *f = NULL;
 789         FDSet *fds = NULL;
 790         int r;
 791
 792         assert(m);
 793         assert(_f);
 794         assert(_fds);
 795
 796         if ((r = manager_open_serialization(m, &f)) < 0) {
 797                 log_error("Failed to create serialization faile: %s", strerror(-r));
 798                 goto fail;
 799         }
 800
 801         if (!(fds = fdset_new())) {
 802                 r = -ENOMEM;
 803                 log_error("Failed to allocate fd set: %s", strerror(-r));
 804                 goto fail;
 805         }
 806
 807         if ((r = manager_serialize(m, f, fds)) < 0) {
 808                 log_error("Failed to serialize state: %s", strerror(-r));
 809                 goto fail;
 810         }
 811
 812         if (fseeko(f, 0, SEEK_SET) < 0) {
 813                 log_error("Failed to rewind serialization fd: %m");
 814                 goto fail;
 815         }
 816
 817         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 818                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 819                 goto fail;
 820         }
 821
 822         if ((r = fdset_cloexec(fds, false)) < 0) {
 823                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 824                 goto fail;
 825         }
 826
 827         *_f = f;
 828         *_fds = fds;
 829
 830         return 0;
 831
 832 fail:
 833         fdset_free(fds);
 834
 835         if (f)
 836                 fclose(f);
 837
 838         return r;
 839 }
 840
 841 int main(int argc, char *argv[]) {
 842         Manager *m = NULL;
 843         Unit *target = NULL;
 844         int r, retval = 1;
 845         FDSet *fds = NULL;
 846         bool reexecute = false;
 847
 848         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 849                 /* This is compatbility support for SysV, where
 850                  * calling init as a user is identical to telinit. */
 851
 852                 errno = -ENOENT;
 853                 execv(SYSTEMCTL_BINARY_PATH, argv);
 854                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 855                 return 1;
 856         }
 857
 858         log_show_color(isatty(STDERR_FILENO) > 0);
 859         log_show_location(false);
 860         log_set_max_level(LOG_INFO);
 861
 862         if (getpid() == 1) {
 863                 arg_running_as = MANAGER_SYSTEM;
 864                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 865
 866                 if (label_init() < 0)
 867                         goto finish;
 868         } else {
 869                 arg_running_as = MANAGER_SESSION;
 870                 log_set_target(LOG_TARGET_CONSOLE);
 871         }
 872
 873         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 874                 goto finish;
 875
 876         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 877          * /proc/$PID/fd is available. */
 878         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 879                 if (mount_setup() < 0)
 880                         goto finish;
 881
 882         /* Reset all signal handlers. */
 883         assert_se(reset_all_signal_handlers() == 0);
 884
 885         /* If we are init, we can block sigkill. Yay. */
 886         ignore_signals(SIGNALS_IGNORE, -1);
 887
 888         if (parse_config_file() < 0)
 889                 goto finish;
 890
 891         if (arg_running_as == MANAGER_SYSTEM)
 892                 if (parse_proc_cmdline() < 0)
 893                         goto finish;
 894
 895         log_parse_environment();
 896
 897         if (parse_argv(argc, argv) < 0)
 898                 goto finish;
 899
 900         if (arg_action == ACTION_HELP) {
 901                 retval = help();
 902                 goto finish;
 903         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 904                 unit_dump_config_items(stdout);
 905                 retval = 0;
 906                 goto finish;
 907         } else if (arg_action == ACTION_DONE) {
 908                 retval = 0;
 909                 goto finish;
 910         }
 911
 912         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 913
 914         /* Remember open file descriptors for later deserialization */
 915         if (serialization) {
 916                 if ((r = fdset_new_fill(&fds)) < 0) {
 917                         log_error("Failed to allocate fd set: %s", strerror(-r));
 918                         goto finish;
 919                 }
 920
 921                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 922         } else
 923                 close_all_fds(NULL, 0);
 924
 925         /* Set up PATH unless it is already set */
 926         setenv("PATH",
 927                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 928                arg_running_as == MANAGER_SYSTEM);
 929
 930         /* Move out of the way, so that we won't block unmounts */
 931         assert_se(chdir("/")  == 0);
 932
 933         if (arg_running_as == MANAGER_SYSTEM) {
 934                 /* Become a session leader if we aren't one yet. */
 935                 setsid();
 936
 937                 /* Disable the umask logic */
 938                 umask(0);
 939         }
 940
 941         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 942         dbus_connection_set_change_sigpipe(FALSE);
 943
 944         /* Reset the console, but only if this is really init and we
 945          * are freshly booted */
 946         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 947                 console_setup(getpid() == 1 && !serialization);
 948                 make_null_stdio();
 949         }
 950
 951         /* Open the logging devices, if possible and necessary */
 952         log_open();
 953
 954         /* Make sure we leave a core dump without panicing the
 955          * kernel. */
 956         if (getpid() == 1)
 957                 install_crash_handler();
 958
 959         log_info(PACKAGE_STRING " running in %s mode.", manager_running_as_to_string(arg_running_as));
 960
 961         if (arg_running_as == MANAGER_SYSTEM) {
 962
 963                 /* Disable nscd, to avoid deadlocks when systemd uses
 964                  * NSS and the nscd socket is maintained by us. */
 965                 /* if (nss_disable_nscd) { */
 966                 /*         log_debug("Disabling nscd"); */
 967                 /*         nss_disable_nscd(); */
 968                 /* } else */
 969                 /*         log_debug("Hmm, can't disable nscd."); */
 970
 971                 if (!serialization) {
 972                         if (arg_show_status)
 973                                 status_welcome();
 974                         modprobe_setup(arg_nomodules);
 975                         kmod_setup();
 976                         hostname_setup();
 977                         loopback_setup();
 978                 }
 979         }
 980
 981         if ((r = manager_new(arg_running_as, &m)) < 0) {
 982                 log_error("Failed to allocate manager object: %s", strerror(-r));
 983                 goto finish;
 984         }
 985
 986         m->confirm_spawn = arg_confirm_spawn;
 987         m->show_status = arg_show_status;
 988
 989         if ((r = manager_startup(m, serialization, fds)) < 0)
 990                 log_error("Failed to fully start up daemon: %s", strerror(-r));
 991
 992         if (fds) {
 993                 /* This will close all file descriptors that were opened, but
 994                  * not claimed by any unit. */
 995
 996                 fdset_free(fds);
 997                 fds = NULL;
 998         }
 999
1000         if (serialization) {
1001                 fclose(serialization);
1002                 serialization = NULL;
1003         } else {
1004                 DBusError error;
1005
1006                 dbus_error_init(&error);
1007
1008                 log_debug("Activating default unit: %s", arg_default_unit);
1009
1010                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1011                         log_error("Failed to load default target: %s", bus_error(&error, r));
1012                         dbus_error_free(&error);
1013
1014                         log_info("Trying to load rescue target...");
1015                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1016                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1017                                 dbus_error_free(&error);
1018                                 goto finish;
1019                         }
1020                 }
1021
1022                 if (arg_action == ACTION_TEST) {
1023                         printf("-> By units:\n");
1024                         manager_dump_units(m, stdout, "\t");
1025                 }
1026
1027                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1028                         log_error("Failed to start default target: %s", bus_error(&error, r));
1029                         dbus_error_free(&error);
1030                         goto finish;
1031                 }
1032
1033                 if (arg_console && arg_running_as == MANAGER_SYSTEM) {
1034                         char *name;
1035
1036                         if (asprintf(&name, "getty@%s.service", arg_console) < 0)
1037                                 log_error("Out of memory while generating console getty service name.");
1038                         else {
1039                                 if ((r = manager_add_job_by_name(m, JOB_START, name, JOB_FAIL, false, &error, NULL)) < 0) {
1040                                         log_error("Failed to start console getty target: %s", bus_error(&error, r));
1041                                         dbus_error_free(&error);
1042                                 }
1043
1044                                 free(name);
1045                         }
1046                 }
1047
1048                 if (arg_action == ACTION_TEST) {
1049                         printf("-> By jobs:\n");
1050                         manager_dump_jobs(m, stdout, "\t");
1051                         retval = 0;
1052                         goto finish;
1053                 }
1054         }
1055
1056         for (;;) {
1057                 if ((r = manager_loop(m)) < 0) {
1058                         log_error("Failed to run mainloop: %s", strerror(-r));
1059                         goto finish;
1060                 }
1061
1062                 switch (m->exit_code) {
1063
1064                 case MANAGER_EXIT:
1065                         retval = 0;
1066                         log_debug("Exit.");
1067                         goto finish;
1068
1069                 case MANAGER_RELOAD:
1070                         log_info("Reloading.");
1071                         if ((r = manager_reload(m)) < 0)
1072                                 log_error("Failed to reload: %s", strerror(-r));
1073                         break;
1074
1075                 case MANAGER_REEXECUTE:
1076                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1077                                 goto finish;
1078
1079                         reexecute = true;
1080                         log_notice("Reexecuting.");
1081                         goto finish;
1082
1083                 default:
1084                         assert_not_reached("Unknown exit code.");
1085                 }
1086         }
1087
1088 finish:
1089         if (m)
1090                 manager_free(m);
1091
1092         free(arg_default_unit);
1093         free(arg_console);
1094
1095         dbus_shutdown();
1096
1097         if (reexecute) {
1098                 const char *args[14];
1099                 unsigned i = 0;
1100                 char sfd[16];
1101
1102                 assert(serialization);
1103                 assert(fds);
1104
1105                 args[i++] = SYSTEMD_BINARY_PATH;
1106
1107                 args[i++] = "--log-level";
1108                 args[i++] = log_level_to_string(log_get_max_level());
1109
1110                 args[i++] = "--log-target";
1111                 args[i++] = log_target_to_string(log_get_target());
1112
1113                 if (arg_running_as == MANAGER_SYSTEM)
1114                         args[i++] = "--system";
1115                 else
1116                         args[i++] = "--session";
1117
1118                 if (arg_dump_core)
1119                         args[i++] = "--dump-core";
1120
1121                 if (arg_crash_shell)
1122                         args[i++] = "--crash-shell";
1123
1124                 if (arg_confirm_spawn)
1125                         args[i++] = "--confirm-spawn";
1126
1127                 if (arg_show_status)
1128                         args[i++] = "--show-status";
1129
1130                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1131                 char_array_0(sfd);
1132
1133                 args[i++] = "--deserialize";
1134                 args[i++] = sfd;
1135
1136                 args[i++] = NULL;
1137
1138                 assert(i <= ELEMENTSOF(args));
1139
1140                 execv(args[0], (char* const*) args);
1141
1142                 log_error("Failed to reexecute: %m");
1143         }
1144
1145         if (serialization)
1146                 fclose(serialization);
1147
1148         if (fds)
1149                 fdset_free(fds);
1150
1151         if (getpid() == 1)
1152                 freeze();
1153
1154         label_finish();
1155
1156         return retval;
1157 }