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 static bool arg_sysv_console = true;
  68
  69 static FILE* serialization = NULL;
  70
  71 _noreturn_ static void freeze(void) {
  72         for (;;)
  73                 pause();
  74 }
  75
  76 static void nop_handler(int sig) {
  77 }
  78
  79 _noreturn_ static void crash(int sig) {
  80
  81         if (!arg_dump_core)
  82                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  83         else {
  84                 struct sigaction sa;
  85                 pid_t pid;
  86
  87                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  88                 zero(sa);
  89                 sa.sa_handler = nop_handler;
  90                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  91                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  92
  93                 if ((pid = fork()) < 0)
  94                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  95
  96                 else if (pid == 0) {
  97                         struct rlimit rl;
  98
  99                         /* Enable default signal handler for core dump */
 100                         zero(sa);
 101                         sa.sa_handler = SIG_DFL;
 102                         assert_se(sigaction(sig, &sa, NULL) == 0);
 103
 104                         /* Don't limit the core dump size */
 105                         zero(rl);
 106                         rl.rlim_cur = RLIM_INFINITY;
 107                         rl.rlim_max = RLIM_INFINITY;
 108                         setrlimit(RLIMIT_CORE, &rl);
 109
 110                         /* Just to be sure... */
 111                         assert_se(chdir("/") == 0);
 112
 113                         /* Raise the signal again */
 114                         raise(sig);
 115
 116                         assert_not_reached("We shouldn't be here...");
 117                         _exit(1);
 118
 119                 } else {
 120                         int status, r;
 121
 122                         /* Order things nicely. */
 123                         if ((r = waitpid(pid, &status, 0)) < 0)
 124                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(errno));
 125                         else if (!WCOREDUMP(status))
 126                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 127                         else
 128                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 129                 }
 130         }
 131
 132         if (arg_crash_chvt)
 133                 chvt(arg_crash_chvt);
 134
 135         if (arg_crash_shell) {
 136                 struct sigaction sa;
 137                 pid_t pid;
 138
 139                 log_info("Executing crash shell in 10s...");
 140                 sleep(10);
 141
 142                 /* Let the kernel reap children for us */
 143                 zero(sa);
 144                 sa.sa_handler = SIG_IGN;
 145                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 146                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 147
 148                 if ((pid = fork()) < 0)
 149                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 150                 else if (pid == 0) {
 151                         int fd, r;
 152
 153                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 154                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 155                         else if ((r = make_stdio(fd)) < 0)
 156                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 157
 158                         execl("/bin/sh", "/bin/sh", NULL);
 159
 160                         log_error("execl() failed: %s", strerror(errno));
 161                         _exit(1);
 162                 }
 163
 164                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 165         }
 166
 167         log_info("Freezing execution.");
 168         freeze();
 169 }
 170
 171 static void install_crash_handler(void) {
 172         struct sigaction sa;
 173
 174         zero(sa);
 175
 176         sa.sa_handler = crash;
 177         sa.sa_flags = SA_NODEFER;
 178
 179         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 180 }
 181
 182 static int make_null_stdio(void) {
 183         int null_fd, r;
 184
 185         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 186                 log_error("Failed to open /dev/null: %m");
 187                 return -errno;
 188         }
 189
 190         if ((r = make_stdio(null_fd)) < 0)
 191                 log_warning("Failed to dup2() device: %s", strerror(-r));
 192
 193         return r;
 194 }
 195
 196 static int console_setup(bool do_reset) {
 197         int tty_fd, r;
 198
 199         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 200          * and make sure we don't have a controlling tty. */
 201
 202         release_terminal();
 203
 204         if (!do_reset)
 205                 return 0;
 206
 207         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 208                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 209                 return -tty_fd;
 210         }
 211
 212         if ((r = reset_terminal(tty_fd)) < 0)
 213                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 214
 215         close_nointr_nofail(tty_fd);
 216         return r;
 217 }
 218
 219 static int set_default_unit(const char *u) {
 220         char *c;
 221
 222         assert(u);
 223
 224         if (!(c = strdup(u)))
 225                 return -ENOMEM;
 226
 227         free(arg_default_unit);
 228         arg_default_unit = c;
 229         return 0;
 230 }
 231
 232 static int parse_proc_cmdline_word(const char *word) {
 233
 234         static const char * const rlmap[] = {
 235                 "single", SPECIAL_RESCUE_TARGET,
 236                 "-s",     SPECIAL_RESCUE_TARGET,
 237                 "s",      SPECIAL_RESCUE_TARGET,
 238                 "S",      SPECIAL_RESCUE_TARGET,
 239                 "1",      SPECIAL_RESCUE_TARGET,
 240                 "2",      SPECIAL_RUNLEVEL2_TARGET,
 241                 "3",      SPECIAL_RUNLEVEL3_TARGET,
 242                 "4",      SPECIAL_RUNLEVEL4_TARGET,
 243                 "5",      SPECIAL_RUNLEVEL5_TARGET
 244         };
 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
 309         } else if (startswith(word, "systemd.sysv_console=")) {
 310                 int r;
 311
 312                 if ((r = parse_boolean(word + 21)) < 0)
 313                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 314                 else
 315                         arg_sysv_console = r;
 316
 317         } else if (startswith(word, "systemd.")) {
 318
 319                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 320
 321                 log_info("Supported kernel switches:\n"
 322                          "systemd.unit=UNIT                        Default unit to start\n"
 323                          "systemd.dump_core=0|1                    Dump core on crash\n"
 324                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 325                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 326                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 327                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 328                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 329                          "systemd.log_target=console|kmsg|syslog|syslog-org-kmsg|null\n"
 330                          "                                         Log target\n"
 331                          "systemd.log_level=LEVEL                  Log level\n"
 332                          "systemd.log_color=0|1                    Highlight important log messages\n"
 333                          "systemd.log_location=0|1                 Include code location in log messages\n");
 334
 335         } else if (streq(word, "nomodules"))
 336                 arg_nomodules = true;
 337         else if (startswith(word, "console=")) {
 338                 const char *k;
 339                 size_t l;
 340                 char *w = NULL;
 341
 342                 k = word + 8;
 343                 l = strcspn(k, ",");
 344
 345                 if (l < 4 ||
 346                     !startswith(k, "tty") ||
 347                     k[3+strspn(k+3, "0123456789")] != 0) {
 348
 349                         if (!(w = strndup(k, l)))
 350                                 return -ENOMEM;
 351                 }
 352
 353                 free(arg_console);
 354                 arg_console = w;
 355
 356         } else if (streq(word, "quiet")) {
 357                 arg_show_status = false;
 358                 arg_sysv_console = false;
 359         } else {
 360                 unsigned i;
 361
 362                 /* SysV compatibility */
 363                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 364                         if (streq(word, rlmap[i]))
 365                                 return set_default_unit(rlmap[i+1]);
 366         }
 367
 368         return 0;
 369 }
 370
 371 static int config_parse_level(
 372                 const char *filename,
 373                 unsigned line,
 374                 const char *section,
 375                 const char *lvalue,
 376                 const char *rvalue,
 377                 void *data,
 378                 void *userdata) {
 379
 380         assert(filename);
 381         assert(lvalue);
 382         assert(rvalue);
 383
 384         log_set_max_level_from_string(rvalue);
 385         return 0;
 386 }
 387
 388 static int config_parse_target(
 389                 const char *filename,
 390                 unsigned line,
 391                 const char *section,
 392                 const char *lvalue,
 393                 const char *rvalue,
 394                 void *data,
 395                 void *userdata) {
 396
 397         assert(filename);
 398         assert(lvalue);
 399         assert(rvalue);
 400
 401         log_set_target_from_string(rvalue);
 402         return 0;
 403 }
 404
 405 static int config_parse_color(
 406                 const char *filename,
 407                 unsigned line,
 408                 const char *section,
 409                 const char *lvalue,
 410                 const char *rvalue,
 411                 void *data,
 412                 void *userdata) {
 413
 414         assert(filename);
 415         assert(lvalue);
 416         assert(rvalue);
 417
 418         log_show_color_from_string(rvalue);
 419         return 0;
 420 }
 421
 422 static int config_parse_location(
 423                 const char *filename,
 424                 unsigned line,
 425                 const char *section,
 426                 const char *lvalue,
 427                 const char *rvalue,
 428                 void *data,
 429                 void *userdata) {
 430
 431         assert(filename);
 432         assert(lvalue);
 433         assert(rvalue);
 434
 435         log_show_location_from_string(rvalue);
 436         return 0;
 437 }
 438
 439 static int config_parse_cpu_affinity(
 440                 const char *filename,
 441                 unsigned line,
 442                 const char *section,
 443                 const char *lvalue,
 444                 const char *rvalue,
 445                 void *data,
 446                 void *userdata) {
 447
 448         char *w;
 449         size_t l;
 450         char *state;
 451         cpu_set_t *c = NULL;
 452         unsigned ncpus = 0;
 453
 454         assert(filename);
 455         assert(lvalue);
 456         assert(rvalue);
 457
 458         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 459                 char *t;
 460                 int r;
 461                 unsigned cpu;
 462
 463                 if (!(t = strndup(w, l)))
 464                         return -ENOMEM;
 465
 466                 r = safe_atou(t, &cpu);
 467                 free(t);
 468
 469                 if (!c)
 470                         if (!(c = cpu_set_malloc(&ncpus)))
 471                                 return -ENOMEM;
 472
 473                 if (r < 0 || cpu >= ncpus) {
 474                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 475                         CPU_FREE(c);
 476                         return -EBADMSG;
 477                 }
 478
 479                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 480         }
 481
 482         if (c) {
 483                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 484                         log_warning("Failed to set CPU affinity: %m");
 485
 486                 CPU_FREE(c);
 487         }
 488
 489         return 0;
 490 }
 491
 492 static int parse_config_file(void) {
 493
 494         const ConfigItem items[] = {
 495                 { "LogLevel",    config_parse_level,        NULL,             "Manager" },
 496                 { "LogTarget",   config_parse_target,       NULL,             "Manager" },
 497                 { "LogColor",    config_parse_color,        NULL,             "Manager" },
 498                 { "LogLocation", config_parse_location,     NULL,             "Manager" },
 499                 { "DumpCore",    config_parse_bool,         &arg_dump_core,   "Manager" },
 500                 { "CrashShell",  config_parse_bool,         &arg_crash_shell, "Manager" },
 501                 { "ShowStatus",  config_parse_bool,         &arg_show_status, "Manager" },
 502                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,"Manager" },
 503                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,  "Manager" },
 504                 { "CPUAffinity", config_parse_cpu_affinity, NULL,             "Manager" },
 505                 { NULL, NULL, NULL, NULL }
 506         };
 507
 508         static const char * const sections[] = {
 509                 "Manager",
 510                 NULL
 511         };
 512
 513         FILE *f;
 514         const char *fn;
 515         int r;
 516
 517         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 518
 519         if (!(f = fopen(fn, "re"))) {
 520                 if (errno == ENOENT)
 521                         return 0;
 522
 523                 log_warning("Failed to open configuration file '%s': %m", fn);
 524                 return 0;
 525         }
 526
 527         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 528                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 529
 530         fclose(f);
 531
 532         return 0;
 533 }
 534
 535 static int parse_proc_cmdline(void) {
 536         char *line;
 537         int r;
 538         char *w;
 539         size_t l;
 540         char *state;
 541
 542         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 543                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
 544                 return 0;
 545         }
 546
 547         FOREACH_WORD_QUOTED(w, l, line, state) {
 548                 char *word;
 549
 550                 if (!(word = strndup(w, l))) {
 551                         r = -ENOMEM;
 552                         goto finish;
 553                 }
 554
 555                 r = parse_proc_cmdline_word(word);
 556                 free(word);
 557
 558                 if (r < 0)
 559                         goto finish;
 560         }
 561
 562         r = 0;
 563
 564 finish:
 565         free(line);
 566         return r;
 567 }
 568
 569 static int parse_argv(int argc, char *argv[]) {
 570
 571         enum {
 572                 ARG_LOG_LEVEL = 0x100,
 573                 ARG_LOG_TARGET,
 574                 ARG_LOG_COLOR,
 575                 ARG_LOG_LOCATION,
 576                 ARG_UNIT,
 577                 ARG_SYSTEM,
 578                 ARG_SESSION,
 579                 ARG_TEST,
 580                 ARG_DUMP_CONFIGURATION_ITEMS,
 581                 ARG_DUMP_CORE,
 582                 ARG_CRASH_SHELL,
 583                 ARG_CONFIRM_SPAWN,
 584                 ARG_SHOW_STATUS,
 585                 ARG_SYSV_CONSOLE,
 586                 ARG_DESERIALIZE,
 587                 ARG_INTROSPECT
 588         };
 589
 590         static const struct option options[] = {
 591                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 592                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 593                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 594                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 595                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 596                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 597                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 598                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 599                 { "help",                     no_argument,       NULL, 'h'                          },
 600                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 601                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 602                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 603                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 604                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 605                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 606                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 607                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 608                 { NULL,                       0,                 NULL, 0                            }
 609         };
 610
 611         int c, r;
 612
 613         assert(argc >= 1);
 614         assert(argv);
 615
 616         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 617
 618                 switch (c) {
 619
 620                 case ARG_LOG_LEVEL:
 621                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 622                                 log_error("Failed to parse log level %s.", optarg);
 623                                 return r;
 624                         }
 625
 626                         break;
 627
 628                 case ARG_LOG_TARGET:
 629
 630                         if ((r = log_set_target_from_string(optarg)) < 0) {
 631                                 log_error("Failed to parse log target %s.", optarg);
 632                                 return r;
 633                         }
 634
 635                         break;
 636
 637                 case ARG_LOG_COLOR:
 638
 639                         if (optarg) {
 640                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 641                                         log_error("Failed to parse log color setting %s.", optarg);
 642                                         return r;
 643                                 }
 644                         } else
 645                                 log_show_color(true);
 646
 647                         break;
 648
 649                 case ARG_LOG_LOCATION:
 650
 651                         if (optarg) {
 652                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 653                                         log_error("Failed to parse log location setting %s.", optarg);
 654                                         return r;
 655                                 }
 656                         } else
 657                                 log_show_location(true);
 658
 659                         break;
 660
 661                 case ARG_UNIT:
 662
 663                         if ((r = set_default_unit(optarg)) < 0) {
 664                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 665                                 return r;
 666                         }
 667
 668                         break;
 669
 670                 case ARG_SYSTEM:
 671                         arg_running_as = MANAGER_SYSTEM;
 672                         break;
 673
 674                 case ARG_SESSION:
 675                         arg_running_as = MANAGER_SESSION;
 676                         break;
 677
 678                 case ARG_TEST:
 679                         arg_action = ACTION_TEST;
 680                         break;
 681
 682                 case ARG_DUMP_CONFIGURATION_ITEMS:
 683                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 684                         break;
 685
 686                 case ARG_DUMP_CORE:
 687                         arg_dump_core = true;
 688                         break;
 689
 690                 case ARG_CRASH_SHELL:
 691                         arg_crash_shell = true;
 692                         break;
 693
 694                 case ARG_CONFIRM_SPAWN:
 695                         arg_confirm_spawn = true;
 696                         break;
 697
 698                 case ARG_SHOW_STATUS:
 699
 700                         if (optarg) {
 701                                 if ((r = parse_boolean(optarg)) < 0) {
 702                                         log_error("Failed to show status boolean %s.", optarg);
 703                                         return r;
 704                                 }
 705                                 arg_show_status = r;
 706                         } else
 707                                 arg_show_status = true;
 708                         break;
 709
 710                 case ARG_SYSV_CONSOLE:
 711
 712                         if (optarg) {
 713                                 if ((r = parse_boolean(optarg)) < 0) {
 714                                         log_error("Failed to SysV console boolean %s.", optarg);
 715                                         return r;
 716                                 }
 717                                 arg_sysv_console = r;
 718                         } else
 719                                 arg_sysv_console = true;
 720                         break;
 721
 722                 case ARG_DESERIALIZE: {
 723                         int fd;
 724                         FILE *f;
 725
 726                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 727                                 log_error("Failed to parse deserialize option %s.", optarg);
 728                                 return r;
 729                         }
 730
 731                         if (!(f = fdopen(fd, "r"))) {
 732                                 log_error("Failed to open serialization fd: %m");
 733                                 return r;
 734                         }
 735
 736                         if (serialization)
 737                                 fclose(serialization);
 738
 739                         serialization = f;
 740
 741                         break;
 742                 }
 743
 744                 case ARG_INTROSPECT: {
 745                         const char * const * i = NULL;
 746
 747                         for (i = bus_interface_table; *i; i += 2)
 748                                 if (!optarg || streq(i[0], optarg)) {
 749                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 750                                               "<node>\n", stdout);
 751                                         fputs(i[1], stdout);
 752                                         fputs("</node>\n", stdout);
 753
 754                                         if (optarg)
 755                                                 break;
 756                                 }
 757
 758                         if (!i[0] && optarg)
 759                                 log_error("Unknown interface %s.", optarg);
 760
 761                         arg_action = ACTION_DONE;
 762                         break;
 763                 }
 764
 765                 case 'h':
 766                         arg_action = ACTION_HELP;
 767                         break;
 768
 769                 case 'D':
 770                         log_set_max_level(LOG_DEBUG);
 771                         break;
 772
 773                 case '?':
 774                         return -EINVAL;
 775
 776                 default:
 777                         log_error("Unknown option code %c", c);
 778                         return -EINVAL;
 779                 }
 780
 781         /* PID 1 will get the kernel arguments as parameters, which we
 782          * ignore and unconditionally read from
 783          * /proc/cmdline. However, we need to ignore those arguments
 784          * here. */
 785         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 786                 log_error("Excess arguments.");
 787                 return -EINVAL;
 788         }
 789
 790         return 0;
 791 }
 792
 793 static int help(void) {
 794
 795         printf("%s [OPTIONS...]\n\n"
 796                "Starts up and maintains the system or a session.\n\n"
 797                "  -h --help                      Show this help\n"
 798                "     --test                      Determine startup sequence, dump it and exit\n"
 799                "     --dump-configuration-items  Dump understood unit configuration items\n"
 800                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 801                "     --unit=UNIT                 Set default unit\n"
 802                "     --system                    Run a system instance, even if PID != 1\n"
 803                "     --session                   Run a session instance\n"
 804                "     --dump-core                 Dump core on crash\n"
 805                "     --crash-shell               Run shell on crash\n"
 806                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 807                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 808                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 809                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 810                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 811                "     --log-color[=0|1]           Highlight important log messages\n"
 812                "     --log-location[=0|1]        Include code location in log messages\n",
 813                program_invocation_short_name);
 814
 815         return 0;
 816 }
 817
 818 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 819         FILE *f = NULL;
 820         FDSet *fds = NULL;
 821         int r;
 822
 823         assert(m);
 824         assert(_f);
 825         assert(_fds);
 826
 827         if ((r = manager_open_serialization(m, &f)) < 0) {
 828                 log_error("Failed to create serialization faile: %s", strerror(-r));
 829                 goto fail;
 830         }
 831
 832         if (!(fds = fdset_new())) {
 833                 r = -ENOMEM;
 834                 log_error("Failed to allocate fd set: %s", strerror(-r));
 835                 goto fail;
 836         }
 837
 838         if ((r = manager_serialize(m, f, fds)) < 0) {
 839                 log_error("Failed to serialize state: %s", strerror(-r));
 840                 goto fail;
 841         }
 842
 843         if (fseeko(f, 0, SEEK_SET) < 0) {
 844                 log_error("Failed to rewind serialization fd: %m");
 845                 goto fail;
 846         }
 847
 848         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 849                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 850                 goto fail;
 851         }
 852
 853         if ((r = fdset_cloexec(fds, false)) < 0) {
 854                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 855                 goto fail;
 856         }
 857
 858         *_f = f;
 859         *_fds = fds;
 860
 861         return 0;
 862
 863 fail:
 864         fdset_free(fds);
 865
 866         if (f)
 867                 fclose(f);
 868
 869         return r;
 870 }
 871
 872 int main(int argc, char *argv[]) {
 873         Manager *m = NULL;
 874         Unit *target = NULL;
 875         int r, retval = 1;
 876         FDSet *fds = NULL;
 877         bool reexecute = false;
 878
 879         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 880                 /* This is compatbility support for SysV, where
 881                  * calling init as a user is identical to telinit. */
 882
 883                 errno = -ENOENT;
 884                 execv(SYSTEMCTL_BINARY_PATH, argv);
 885                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 886                 return 1;
 887         }
 888
 889         log_show_color(isatty(STDERR_FILENO) > 0);
 890         log_show_location(false);
 891         log_set_max_level(LOG_INFO);
 892
 893         if (getpid() == 1) {
 894                 arg_running_as = MANAGER_SYSTEM;
 895                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 896
 897                 if (label_init() < 0)
 898                         goto finish;
 899         } else {
 900                 arg_running_as = MANAGER_SESSION;
 901                 log_set_target(LOG_TARGET_CONSOLE);
 902         }
 903
 904         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 905                 goto finish;
 906
 907         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 908          * /proc/$PID/fd is available. */
 909         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 910                 if (mount_setup() < 0)
 911                         goto finish;
 912
 913         /* Reset all signal handlers. */
 914         assert_se(reset_all_signal_handlers() == 0);
 915
 916         /* If we are init, we can block sigkill. Yay. */
 917         ignore_signals(SIGNALS_IGNORE, -1);
 918
 919         if (parse_config_file() < 0)
 920                 goto finish;
 921
 922         if (arg_running_as == MANAGER_SYSTEM)
 923                 if (parse_proc_cmdline() < 0)
 924                         goto finish;
 925
 926         log_parse_environment();
 927
 928         if (parse_argv(argc, argv) < 0)
 929                 goto finish;
 930
 931         if (arg_action == ACTION_HELP) {
 932                 retval = help();
 933                 goto finish;
 934         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 935                 unit_dump_config_items(stdout);
 936                 retval = 0;
 937                 goto finish;
 938         } else if (arg_action == ACTION_DONE) {
 939                 retval = 0;
 940                 goto finish;
 941         }
 942
 943         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 944
 945         /* Remember open file descriptors for later deserialization */
 946         if (serialization) {
 947                 if ((r = fdset_new_fill(&fds)) < 0) {
 948                         log_error("Failed to allocate fd set: %s", strerror(-r));
 949                         goto finish;
 950                 }
 951
 952                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 953         } else
 954                 close_all_fds(NULL, 0);
 955
 956         /* Set up PATH unless it is already set */
 957         setenv("PATH",
 958                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 959                arg_running_as == MANAGER_SYSTEM);
 960
 961         /* Move out of the way, so that we won't block unmounts */
 962         assert_se(chdir("/")  == 0);
 963
 964         if (arg_running_as == MANAGER_SYSTEM) {
 965                 /* Become a session leader if we aren't one yet. */
 966                 setsid();
 967
 968                 /* Disable the umask logic */
 969                 umask(0);
 970         }
 971
 972         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 973         dbus_connection_set_change_sigpipe(FALSE);
 974
 975         /* Reset the console, but only if this is really init and we
 976          * are freshly booted */
 977         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 978                 console_setup(getpid() == 1 && !serialization);
 979                 make_null_stdio();
 980         }
 981
 982         /* Open the logging devices, if possible and necessary */
 983         log_open();
 984
 985         /* Make sure we leave a core dump without panicing the
 986          * kernel. */
 987         if (getpid() == 1)
 988                 install_crash_handler();
 989
 990         log_info(PACKAGE_STRING " running in %s mode.", manager_running_as_to_string(arg_running_as));
 991
 992         if (arg_running_as == MANAGER_SYSTEM) {
 993
 994                 /* Disable nscd, to avoid deadlocks when systemd uses
 995                  * NSS and the nscd socket is maintained by us. */
 996                 /* if (nss_disable_nscd) { */
 997                 /*         log_debug("Disabling nscd"); */
 998                 /*         nss_disable_nscd(); */
 999                 /* } else */
1000                 /*         log_debug("Hmm, can't disable nscd."); */
1001
1002                 if (!serialization) {
1003                         if (arg_show_status)
1004                                 status_welcome();
1005                         modprobe_setup(arg_nomodules);
1006                         kmod_setup();
1007                         hostname_setup();
1008                         loopback_setup();
1009                 }
1010         }
1011
1012         if ((r = manager_new(arg_running_as, &m)) < 0) {
1013                 log_error("Failed to allocate manager object: %s", strerror(-r));
1014                 goto finish;
1015         }
1016
1017         m->confirm_spawn = arg_confirm_spawn;
1018         m->show_status = arg_show_status;
1019         m->sysv_console = arg_sysv_console;
1020
1021         if ((r = manager_startup(m, serialization, fds)) < 0)
1022                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1023
1024         if (fds) {
1025                 /* This will close all file descriptors that were opened, but
1026                  * not claimed by any unit. */
1027
1028                 fdset_free(fds);
1029                 fds = NULL;
1030         }
1031
1032         if (serialization) {
1033                 fclose(serialization);
1034                 serialization = NULL;
1035         } else {
1036                 DBusError error;
1037
1038                 dbus_error_init(&error);
1039
1040                 log_debug("Activating default unit: %s", arg_default_unit);
1041
1042                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1043                         log_error("Failed to load default target: %s", bus_error(&error, r));
1044                         dbus_error_free(&error);
1045
1046                         log_info("Trying to load rescue target...");
1047                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1048                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1049                                 dbus_error_free(&error);
1050                                 goto finish;
1051                         }
1052                 }
1053
1054                 if (arg_action == ACTION_TEST) {
1055                         printf("-> By units:\n");
1056                         manager_dump_units(m, stdout, "\t");
1057                 }
1058
1059                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1060                         log_error("Failed to start default target: %s", bus_error(&error, r));
1061                         dbus_error_free(&error);
1062                         goto finish;
1063                 }
1064
1065                 if (arg_console && arg_running_as == MANAGER_SYSTEM) {
1066                         char *name;
1067
1068                         if (asprintf(&name, "getty@%s.service", arg_console) < 0)
1069                                 log_error("Out of memory while generating console getty service name.");
1070                         else {
1071                                 if ((r = manager_add_job_by_name(m, JOB_START, name, JOB_FAIL, false, &error, NULL)) < 0) {
1072                                         log_error("Failed to start console getty target: %s", bus_error(&error, r));
1073                                         dbus_error_free(&error);
1074                                 }
1075
1076                                 free(name);
1077                         }
1078                 }
1079
1080                 if (arg_action == ACTION_TEST) {
1081                         printf("-> By jobs:\n");
1082                         manager_dump_jobs(m, stdout, "\t");
1083                         retval = 0;
1084                         goto finish;
1085                 }
1086         }
1087
1088         for (;;) {
1089                 if ((r = manager_loop(m)) < 0) {
1090                         log_error("Failed to run mainloop: %s", strerror(-r));
1091                         goto finish;
1092                 }
1093
1094                 switch (m->exit_code) {
1095
1096                 case MANAGER_EXIT:
1097                         retval = 0;
1098                         log_debug("Exit.");
1099                         goto finish;
1100
1101                 case MANAGER_RELOAD:
1102                         log_info("Reloading.");
1103                         if ((r = manager_reload(m)) < 0)
1104                                 log_error("Failed to reload: %s", strerror(-r));
1105                         break;
1106
1107                 case MANAGER_REEXECUTE:
1108                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1109                                 goto finish;
1110
1111                         reexecute = true;
1112                         log_notice("Reexecuting.");
1113                         goto finish;
1114
1115                 default:
1116                         assert_not_reached("Unknown exit code.");
1117                 }
1118         }
1119
1120 finish:
1121         if (m)
1122                 manager_free(m);
1123
1124         free(arg_default_unit);
1125         free(arg_console);
1126
1127         dbus_shutdown();
1128
1129         if (reexecute) {
1130                 const char *args[15];
1131                 unsigned i = 0;
1132                 char sfd[16];
1133
1134                 assert(serialization);
1135                 assert(fds);
1136
1137                 args[i++] = SYSTEMD_BINARY_PATH;
1138
1139                 args[i++] = "--log-level";
1140                 args[i++] = log_level_to_string(log_get_max_level());
1141
1142                 args[i++] = "--log-target";
1143                 args[i++] = log_target_to_string(log_get_target());
1144
1145                 if (arg_running_as == MANAGER_SYSTEM)
1146                         args[i++] = "--system";
1147                 else
1148                         args[i++] = "--session";
1149
1150                 if (arg_dump_core)
1151                         args[i++] = "--dump-core";
1152
1153                 if (arg_crash_shell)
1154                         args[i++] = "--crash-shell";
1155
1156                 if (arg_confirm_spawn)
1157                         args[i++] = "--confirm-spawn";
1158
1159                 if (arg_show_status)
1160                         args[i++] = "--show-status=1";
1161                 else
1162                         args[i++] = "--show-status=0";
1163
1164                 if (arg_sysv_console)
1165                         args[i++] = "--sysv-console=1";
1166                 else
1167                         args[i++] = "--sysv-console=0";
1168
1169                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1170                 char_array_0(sfd);
1171
1172                 args[i++] = "--deserialize";
1173                 args[i++] = sfd;
1174
1175                 args[i++] = NULL;
1176
1177                 assert(i <= ELEMENTSOF(args));
1178
1179                 execv(args[0], (char* const*) args);
1180
1181                 log_error("Failed to reexecute: %m");
1182         }
1183
1184         if (serialization)
1185                 fclose(serialization);
1186
1187         if (fds)
1188                 fdset_free(fds);
1189
1190         if (getpid() == 1)
1191                 freeze();
1192
1193         label_finish();
1194
1195         return retval;
1196 }