src/main.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   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 "locale-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 #include "label.h"
  49 #include "build.h"
  50
  51 static enum {
  52         ACTION_RUN,
  53         ACTION_HELP,
  54         ACTION_TEST,
  55         ACTION_DUMP_CONFIGURATION_ITEMS,
  56         ACTION_DONE
  57 } arg_action = ACTION_RUN;
  58
  59 static char *arg_default_unit = NULL;
  60 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  61
  62 static bool arg_dump_core = true;
  63 static bool arg_crash_shell = false;
  64 static int arg_crash_chvt = -1;
  65 static bool arg_confirm_spawn = false;
  66 static bool arg_show_status = true;
  67 #ifdef HAVE_SYSV_COMPAT
  68 static bool arg_sysv_console = true;
  69 #endif
  70 static bool arg_mount_auto = true;
  71 static bool arg_swap_auto = true;
  72 static char *arg_console = NULL;
  73
  74 static FILE* serialization = NULL;
  75
  76 _noreturn_ static void freeze(void) {
  77         for (;;)
  78                 pause();
  79 }
  80
  81 static void nop_handler(int sig) {
  82 }
  83
  84 _noreturn_ static void crash(int sig) {
  85
  86         if (!arg_dump_core)
  87                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  88         else {
  89                 struct sigaction sa;
  90                 pid_t pid;
  91
  92                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  93                 zero(sa);
  94                 sa.sa_handler = nop_handler;
  95                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  96                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  97
  98                 if ((pid = fork()) < 0)
  99                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
 100
 101                 else if (pid == 0) {
 102                         struct rlimit rl;
 103
 104                         /* Enable default signal handler for core dump */
 105                         zero(sa);
 106                         sa.sa_handler = SIG_DFL;
 107                         assert_se(sigaction(sig, &sa, NULL) == 0);
 108
 109                         /* Don't limit the core dump size */
 110                         zero(rl);
 111                         rl.rlim_cur = RLIM_INFINITY;
 112                         rl.rlim_max = RLIM_INFINITY;
 113                         setrlimit(RLIMIT_CORE, &rl);
 114
 115                         /* Just to be sure... */
 116                         assert_se(chdir("/") == 0);
 117
 118                         /* Raise the signal again */
 119                         raise(sig);
 120
 121                         assert_not_reached("We shouldn't be here...");
 122                         _exit(1);
 123
 124                 } else {
 125                         siginfo_t status;
 126                         int r;
 127
 128                         /* Order things nicely. */
 129                         if ((r = wait_for_terminate(pid, &status)) < 0)
 130                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
 131                         else if (status.si_code != CLD_DUMPED)
 132                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 133                         else
 134                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 135                 }
 136         }
 137
 138         if (arg_crash_chvt)
 139                 chvt(arg_crash_chvt);
 140
 141         if (arg_crash_shell) {
 142                 struct sigaction sa;
 143                 pid_t pid;
 144
 145                 log_info("Executing crash shell in 10s...");
 146                 sleep(10);
 147
 148                 /* Let the kernel reap children for us */
 149                 zero(sa);
 150                 sa.sa_handler = SIG_IGN;
 151                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 152                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 153
 154                 if ((pid = fork()) < 0)
 155                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 156                 else if (pid == 0) {
 157                         int fd, r;
 158
 159                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 160                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 161                         else if ((r = make_stdio(fd)) < 0)
 162                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 163
 164                         execl("/bin/sh", "/bin/sh", NULL);
 165
 166                         log_error("execl() failed: %s", strerror(errno));
 167                         _exit(1);
 168                 }
 169
 170                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 171         }
 172
 173         log_info("Freezing execution.");
 174         freeze();
 175 }
 176
 177 static void install_crash_handler(void) {
 178         struct sigaction sa;
 179
 180         zero(sa);
 181
 182         sa.sa_handler = crash;
 183         sa.sa_flags = SA_NODEFER;
 184
 185         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 186 }
 187
 188 static int make_null_stdio(void) {
 189         int null_fd, r;
 190
 191         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 192                 log_error("Failed to open /dev/null: %m");
 193                 return -errno;
 194         }
 195
 196         if ((r = make_stdio(null_fd)) < 0)
 197                 log_warning("Failed to dup2() device: %s", strerror(-r));
 198
 199         return r;
 200 }
 201
 202 static int console_setup(bool do_reset) {
 203         int tty_fd, r;
 204
 205         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 206          * and make sure we don't have a controlling tty. */
 207
 208         release_terminal();
 209
 210         if (!do_reset)
 211                 return 0;
 212
 213         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 214                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 215                 return -tty_fd;
 216         }
 217
 218         if ((r = reset_terminal(tty_fd)) < 0)
 219                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 220
 221         close_nointr_nofail(tty_fd);
 222         return r;
 223 }
 224
 225 static int set_default_unit(const char *u) {
 226         char *c;
 227
 228         assert(u);
 229
 230         if (!(c = strdup(u)))
 231                 return -ENOMEM;
 232
 233         free(arg_default_unit);
 234         arg_default_unit = c;
 235         return 0;
 236 }
 237
 238 static int parse_proc_cmdline_word(const char *word) {
 239
 240         static const char * const rlmap[] = {
 241                 "emergency", SPECIAL_EMERGENCY_TARGET,
 242                 "single",    SPECIAL_RESCUE_TARGET,
 243                 "-s",        SPECIAL_RESCUE_TARGET,
 244                 "s",         SPECIAL_RESCUE_TARGET,
 245                 "S",         SPECIAL_RESCUE_TARGET,
 246                 "1",         SPECIAL_RESCUE_TARGET,
 247                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 248                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 249                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 250                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 251         };
 252
 253         assert(word);
 254
 255         if (startswith(word, "systemd.unit="))
 256                 return set_default_unit(word + 13);
 257
 258         else if (startswith(word, "systemd.log_target=")) {
 259
 260                 if (log_set_target_from_string(word + 19) < 0)
 261                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 262
 263         } else if (startswith(word, "systemd.log_level=")) {
 264
 265                 if (log_set_max_level_from_string(word + 18) < 0)
 266                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 267
 268         } else if (startswith(word, "systemd.log_color=")) {
 269
 270                 if (log_show_color_from_string(word + 18) < 0)
 271                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 272
 273         } else if (startswith(word, "systemd.log_location=")) {
 274
 275                 if (log_show_location_from_string(word + 21) < 0)
 276                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 277
 278         } else if (startswith(word, "systemd.dump_core=")) {
 279                 int r;
 280
 281                 if ((r = parse_boolean(word + 18)) < 0)
 282                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 283                 else
 284                         arg_dump_core = r;
 285
 286         } else if (startswith(word, "systemd.crash_shell=")) {
 287                 int r;
 288
 289                 if ((r = parse_boolean(word + 20)) < 0)
 290                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 291                 else
 292                         arg_crash_shell = r;
 293
 294         } else if (startswith(word, "systemd.confirm_spawn=")) {
 295                 int r;
 296
 297                 if ((r = parse_boolean(word + 22)) < 0)
 298                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 299                 else
 300                         arg_confirm_spawn = r;
 301
 302         } else if (startswith(word, "systemd.crash_chvt=")) {
 303                 int k;
 304
 305                 if (safe_atoi(word + 19, &k) < 0)
 306                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 307                 else
 308                         arg_crash_chvt = k;
 309
 310         } else if (startswith(word, "systemd.show_status=")) {
 311                 int r;
 312
 313                 if ((r = parse_boolean(word + 20)) < 0)
 314                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 315                 else
 316                         arg_show_status = r;
 317 #ifdef HAVE_SYSV_COMPAT
 318         } else if (startswith(word, "systemd.sysv_console=")) {
 319                 int r;
 320
 321                 if ((r = parse_boolean(word + 21)) < 0)
 322                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 323                 else
 324                         arg_sysv_console = r;
 325 #endif
 326
 327         } else if (startswith(word, "systemd.")) {
 328
 329                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 330
 331                 log_info("Supported kernel switches:\n"
 332                          "systemd.unit=UNIT                        Default unit to start\n"
 333                          "systemd.dump_core=0|1                    Dump core on crash\n"
 334                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 335                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 336                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 337                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 338 #ifdef HAVE_SYSV_COMPAT
 339                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 340 #endif
 341                          "systemd.log_target=console|kmsg|syslog|syslog-org-kmsg|null\n"
 342                          "                                         Log target\n"
 343                          "systemd.log_level=LEVEL                  Log level\n"
 344                          "systemd.log_color=0|1                    Highlight important log messages\n"
 345                          "systemd.log_location=0|1                 Include code location in log messages\n");
 346
 347         } else if (startswith(word, "console=")) {
 348                 const char *k;
 349                 size_t l;
 350                 char *w = NULL;
 351
 352                 k = word + 8;
 353                 l = strcspn(k, ",");
 354
 355                 /* Ignore the console setting if set to a VT */
 356                 if (l < 4 ||
 357                     !startswith(k, "tty") ||
 358                     k[3+strspn(k+3, "0123456789")] != 0) {
 359
 360                         if (!(w = strndup(k, l)))
 361                                 return -ENOMEM;
 362                 }
 363
 364                 free(arg_console);
 365                 arg_console = w;
 366
 367         } else if (streq(word, "quiet")) {
 368                 arg_show_status = false;
 369 #ifdef HAVE_SYSV_COMPAT
 370                 arg_sysv_console = false;
 371 #endif
 372         } else {
 373                 unsigned i;
 374
 375                 /* SysV compatibility */
 376                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 377                         if (streq(word, rlmap[i]))
 378                                 return set_default_unit(rlmap[i+1]);
 379         }
 380
 381         return 0;
 382 }
 383
 384 static int config_parse_level(
 385                 const char *filename,
 386                 unsigned line,
 387                 const char *section,
 388                 const char *lvalue,
 389                 const char *rvalue,
 390                 void *data,
 391                 void *userdata) {
 392
 393         assert(filename);
 394         assert(lvalue);
 395         assert(rvalue);
 396
 397         log_set_max_level_from_string(rvalue);
 398         return 0;
 399 }
 400
 401 static int config_parse_target(
 402                 const char *filename,
 403                 unsigned line,
 404                 const char *section,
 405                 const char *lvalue,
 406                 const char *rvalue,
 407                 void *data,
 408                 void *userdata) {
 409
 410         assert(filename);
 411         assert(lvalue);
 412         assert(rvalue);
 413
 414         log_set_target_from_string(rvalue);
 415         return 0;
 416 }
 417
 418 static int config_parse_color(
 419                 const char *filename,
 420                 unsigned line,
 421                 const char *section,
 422                 const char *lvalue,
 423                 const char *rvalue,
 424                 void *data,
 425                 void *userdata) {
 426
 427         assert(filename);
 428         assert(lvalue);
 429         assert(rvalue);
 430
 431         log_show_color_from_string(rvalue);
 432         return 0;
 433 }
 434
 435 static int config_parse_location(
 436                 const char *filename,
 437                 unsigned line,
 438                 const char *section,
 439                 const char *lvalue,
 440                 const char *rvalue,
 441                 void *data,
 442                 void *userdata) {
 443
 444         assert(filename);
 445         assert(lvalue);
 446         assert(rvalue);
 447
 448         log_show_location_from_string(rvalue);
 449         return 0;
 450 }
 451
 452 static int config_parse_cpu_affinity(
 453                 const char *filename,
 454                 unsigned line,
 455                 const char *section,
 456                 const char *lvalue,
 457                 const char *rvalue,
 458                 void *data,
 459                 void *userdata) {
 460
 461         char *w;
 462         size_t l;
 463         char *state;
 464         cpu_set_t *c = NULL;
 465         unsigned ncpus = 0;
 466
 467         assert(filename);
 468         assert(lvalue);
 469         assert(rvalue);
 470
 471         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 472                 char *t;
 473                 int r;
 474                 unsigned cpu;
 475
 476                 if (!(t = strndup(w, l)))
 477                         return -ENOMEM;
 478
 479                 r = safe_atou(t, &cpu);
 480                 free(t);
 481
 482                 if (!c)
 483                         if (!(c = cpu_set_malloc(&ncpus)))
 484                                 return -ENOMEM;
 485
 486                 if (r < 0 || cpu >= ncpus) {
 487                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 488                         CPU_FREE(c);
 489                         return -EBADMSG;
 490                 }
 491
 492                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 493         }
 494
 495         if (c) {
 496                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 497                         log_warning("Failed to set CPU affinity: %m");
 498
 499                 CPU_FREE(c);
 500         }
 501
 502         return 0;
 503 }
 504
 505 static int parse_config_file(void) {
 506
 507         const ConfigItem items[] = {
 508                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 509                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 510                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 511                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 512                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 513                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 514                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 515 #ifdef HAVE_SYSV_COMPAT
 516                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 517 #endif
 518                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 519                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 520                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 521                 { "SwapAuto",    config_parse_bool,         &arg_swap_auto,     "Manager" },
 522                 { NULL, NULL, NULL, NULL }
 523         };
 524
 525         static const char * const sections[] = {
 526                 "Manager",
 527                 NULL
 528         };
 529
 530         FILE *f;
 531         const char *fn;
 532         int r;
 533
 534         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 535
 536         if (!(f = fopen(fn, "re"))) {
 537                 if (errno == ENOENT)
 538                         return 0;
 539
 540                 log_warning("Failed to open configuration file '%s': %m", fn);
 541                 return 0;
 542         }
 543
 544         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 545                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 546
 547         fclose(f);
 548
 549         return 0;
 550 }
 551
 552 static int parse_proc_cmdline(void) {
 553         char *line;
 554         int r;
 555         char *w;
 556         size_t l;
 557         char *state;
 558
 559         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 560                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 561                 return 0;
 562         }
 563
 564         FOREACH_WORD_QUOTED(w, l, line, state) {
 565                 char *word;
 566
 567                 if (!(word = strndup(w, l))) {
 568                         r = -ENOMEM;
 569                         goto finish;
 570                 }
 571
 572                 r = parse_proc_cmdline_word(word);
 573                 free(word);
 574
 575                 if (r < 0)
 576                         goto finish;
 577         }
 578
 579         r = 0;
 580
 581 finish:
 582         free(line);
 583         return r;
 584 }
 585
 586 static int parse_argv(int argc, char *argv[]) {
 587
 588         enum {
 589                 ARG_LOG_LEVEL = 0x100,
 590                 ARG_LOG_TARGET,
 591                 ARG_LOG_COLOR,
 592                 ARG_LOG_LOCATION,
 593                 ARG_UNIT,
 594                 ARG_SYSTEM,
 595                 ARG_SESSION,
 596                 ARG_TEST,
 597                 ARG_DUMP_CONFIGURATION_ITEMS,
 598                 ARG_DUMP_CORE,
 599                 ARG_CRASH_SHELL,
 600                 ARG_CONFIRM_SPAWN,
 601                 ARG_SHOW_STATUS,
 602                 ARG_SYSV_CONSOLE,
 603                 ARG_DESERIALIZE,
 604                 ARG_INTROSPECT
 605         };
 606
 607         static const struct option options[] = {
 608                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 609                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 610                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 611                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 612                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 613                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 614                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 615                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 616                 { "help",                     no_argument,       NULL, 'h'                          },
 617                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 618                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 619                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 620                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 621                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 622 #ifdef HAVE_SYSV_COMPAT
 623                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 624 #endif
 625                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 626                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 627                 { NULL,                       0,                 NULL, 0                            }
 628         };
 629
 630         int c, r;
 631
 632         assert(argc >= 1);
 633         assert(argv);
 634
 635         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 636
 637                 switch (c) {
 638
 639                 case ARG_LOG_LEVEL:
 640                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 641                                 log_error("Failed to parse log level %s.", optarg);
 642                                 return r;
 643                         }
 644
 645                         break;
 646
 647                 case ARG_LOG_TARGET:
 648
 649                         if ((r = log_set_target_from_string(optarg)) < 0) {
 650                                 log_error("Failed to parse log target %s.", optarg);
 651                                 return r;
 652                         }
 653
 654                         break;
 655
 656                 case ARG_LOG_COLOR:
 657
 658                         if (optarg) {
 659                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 660                                         log_error("Failed to parse log color setting %s.", optarg);
 661                                         return r;
 662                                 }
 663                         } else
 664                                 log_show_color(true);
 665
 666                         break;
 667
 668                 case ARG_LOG_LOCATION:
 669
 670                         if (optarg) {
 671                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 672                                         log_error("Failed to parse log location setting %s.", optarg);
 673                                         return r;
 674                                 }
 675                         } else
 676                                 log_show_location(true);
 677
 678                         break;
 679
 680                 case ARG_UNIT:
 681
 682                         if ((r = set_default_unit(optarg)) < 0) {
 683                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 684                                 return r;
 685                         }
 686
 687                         break;
 688
 689                 case ARG_SYSTEM:
 690                         arg_running_as = MANAGER_SYSTEM;
 691                         break;
 692
 693                 case ARG_SESSION:
 694                         arg_running_as = MANAGER_SESSION;
 695                         break;
 696
 697                 case ARG_TEST:
 698                         arg_action = ACTION_TEST;
 699                         break;
 700
 701                 case ARG_DUMP_CONFIGURATION_ITEMS:
 702                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 703                         break;
 704
 705                 case ARG_DUMP_CORE:
 706                         arg_dump_core = true;
 707                         break;
 708
 709                 case ARG_CRASH_SHELL:
 710                         arg_crash_shell = true;
 711                         break;
 712
 713                 case ARG_CONFIRM_SPAWN:
 714                         arg_confirm_spawn = true;
 715                         break;
 716
 717                 case ARG_SHOW_STATUS:
 718
 719                         if (optarg) {
 720                                 if ((r = parse_boolean(optarg)) < 0) {
 721                                         log_error("Failed to show status boolean %s.", optarg);
 722                                         return r;
 723                                 }
 724                                 arg_show_status = r;
 725                         } else
 726                                 arg_show_status = true;
 727                         break;
 728 #ifdef HAVE_SYSV_COMPAT
 729                 case ARG_SYSV_CONSOLE:
 730
 731                         if (optarg) {
 732                                 if ((r = parse_boolean(optarg)) < 0) {
 733                                         log_error("Failed to SysV console boolean %s.", optarg);
 734                                         return r;
 735                                 }
 736                                 arg_sysv_console = r;
 737                         } else
 738                                 arg_sysv_console = true;
 739                         break;
 740 #endif
 741
 742                 case ARG_DESERIALIZE: {
 743                         int fd;
 744                         FILE *f;
 745
 746                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 747                                 log_error("Failed to parse deserialize option %s.", optarg);
 748                                 return r;
 749                         }
 750
 751                         if (!(f = fdopen(fd, "r"))) {
 752                                 log_error("Failed to open serialization fd: %m");
 753                                 return r;
 754                         }
 755
 756                         if (serialization)
 757                                 fclose(serialization);
 758
 759                         serialization = f;
 760
 761                         break;
 762                 }
 763
 764                 case ARG_INTROSPECT: {
 765                         const char * const * i = NULL;
 766
 767                         for (i = bus_interface_table; *i; i += 2)
 768                                 if (!optarg || streq(i[0], optarg)) {
 769                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 770                                               "<node>\n", stdout);
 771                                         fputs(i[1], stdout);
 772                                         fputs("</node>\n", stdout);
 773
 774                                         if (optarg)
 775                                                 break;
 776                                 }
 777
 778                         if (!i[0] && optarg)
 779                                 log_error("Unknown interface %s.", optarg);
 780
 781                         arg_action = ACTION_DONE;
 782                         break;
 783                 }
 784
 785                 case 'h':
 786                         arg_action = ACTION_HELP;
 787                         break;
 788
 789                 case 'D':
 790                         log_set_max_level(LOG_DEBUG);
 791                         break;
 792
 793                 case '?':
 794                         return -EINVAL;
 795
 796                 default:
 797                         log_error("Unknown option code %c", c);
 798                         return -EINVAL;
 799                 }
 800
 801         /* PID 1 will get the kernel arguments as parameters, which we
 802          * ignore and unconditionally read from
 803          * /proc/cmdline. However, we need to ignore those arguments
 804          * here. */
 805         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 806                 log_error("Excess arguments.");
 807                 return -EINVAL;
 808         }
 809
 810         return 0;
 811 }
 812
 813 static int help(void) {
 814
 815         printf("%s [OPTIONS...]\n\n"
 816                "Starts up and maintains the system or a session.\n\n"
 817                "  -h --help                      Show this help\n"
 818                "     --test                      Determine startup sequence, dump it and exit\n"
 819                "     --dump-configuration-items  Dump understood unit configuration items\n"
 820                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 821                "     --unit=UNIT                 Set default unit\n"
 822                "     --system                    Run a system instance, even if PID != 1\n"
 823                "     --session                   Run a session instance\n"
 824                "     --dump-core                 Dump core on crash\n"
 825                "     --crash-shell               Run shell on crash\n"
 826                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 827                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 828 #ifdef HAVE_SYSV_COMPAT
 829                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 830 #endif
 831                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 832                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 833                "     --log-color[=0|1]           Highlight important log messages\n"
 834                "     --log-location[=0|1]        Include code location in log messages\n",
 835                program_invocation_short_name);
 836
 837         return 0;
 838 }
 839
 840 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 841         FILE *f = NULL;
 842         FDSet *fds = NULL;
 843         int r;
 844
 845         assert(m);
 846         assert(_f);
 847         assert(_fds);
 848
 849         if ((r = manager_open_serialization(m, &f)) < 0) {
 850                 log_error("Failed to create serialization faile: %s", strerror(-r));
 851                 goto fail;
 852         }
 853
 854         if (!(fds = fdset_new())) {
 855                 r = -ENOMEM;
 856                 log_error("Failed to allocate fd set: %s", strerror(-r));
 857                 goto fail;
 858         }
 859
 860         if ((r = manager_serialize(m, f, fds)) < 0) {
 861                 log_error("Failed to serialize state: %s", strerror(-r));
 862                 goto fail;
 863         }
 864
 865         if (fseeko(f, 0, SEEK_SET) < 0) {
 866                 log_error("Failed to rewind serialization fd: %m");
 867                 goto fail;
 868         }
 869
 870         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 871                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 872                 goto fail;
 873         }
 874
 875         if ((r = fdset_cloexec(fds, false)) < 0) {
 876                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 877                 goto fail;
 878         }
 879
 880         *_f = f;
 881         *_fds = fds;
 882
 883         return 0;
 884
 885 fail:
 886         fdset_free(fds);
 887
 888         if (f)
 889                 fclose(f);
 890
 891         return r;
 892 }
 893
 894 int main(int argc, char *argv[]) {
 895         Manager *m = NULL;
 896         int r, retval = EXIT_FAILURE;
 897         FDSet *fds = NULL;
 898         bool reexecute = false;
 899
 900         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 901                 /* This is compatbility support for SysV, where
 902                  * calling init as a user is identical to telinit. */
 903
 904                 errno = -ENOENT;
 905                 execv(SYSTEMCTL_BINARY_PATH, argv);
 906                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 907                 return 1;
 908         }
 909
 910         log_show_color(isatty(STDERR_FILENO) > 0);
 911         log_show_location(false);
 912         log_set_max_level(LOG_INFO);
 913
 914         if (getpid() == 1) {
 915                 arg_running_as = MANAGER_SYSTEM;
 916                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 917
 918                 if (label_init() < 0)
 919                         goto finish;
 920         } else {
 921                 arg_running_as = MANAGER_SESSION;
 922                 log_set_target(LOG_TARGET_CONSOLE);
 923         }
 924
 925         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 926                 goto finish;
 927
 928         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 929          * /proc/$PID/fd is available. */
 930         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 931                 if (mount_setup() < 0)
 932                         goto finish;
 933
 934         /* Reset all signal handlers. */
 935         assert_se(reset_all_signal_handlers() == 0);
 936
 937         /* If we are init, we can block sigkill. Yay. */
 938         ignore_signals(SIGNALS_IGNORE, -1);
 939
 940         if (parse_config_file() < 0)
 941                 goto finish;
 942
 943         if (arg_running_as == MANAGER_SYSTEM)
 944                 if (parse_proc_cmdline() < 0)
 945                         goto finish;
 946
 947         log_parse_environment();
 948
 949         if (parse_argv(argc, argv) < 0)
 950                 goto finish;
 951
 952         if (arg_action == ACTION_HELP) {
 953                 retval = help();
 954                 goto finish;
 955         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 956                 unit_dump_config_items(stdout);
 957                 retval = EXIT_SUCCESS;
 958                 goto finish;
 959         } else if (arg_action == ACTION_DONE) {
 960                 retval = EXIT_SUCCESS;
 961                 goto finish;
 962         }
 963
 964         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 965
 966         /* Remember open file descriptors for later deserialization */
 967         if (serialization) {
 968                 if ((r = fdset_new_fill(&fds)) < 0) {
 969                         log_error("Failed to allocate fd set: %s", strerror(-r));
 970                         goto finish;
 971                 }
 972
 973                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 974         } else
 975                 close_all_fds(NULL, 0);
 976
 977         /* Set up PATH unless it is already set */
 978         setenv("PATH",
 979                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 980                arg_running_as == MANAGER_SYSTEM);
 981
 982         /* Move out of the way, so that we won't block unmounts */
 983         assert_se(chdir("/")  == 0);
 984
 985         if (arg_running_as == MANAGER_SYSTEM) {
 986                 /* Become a session leader if we aren't one yet. */
 987                 setsid();
 988
 989                 /* Disable the umask logic */
 990                 umask(0);
 991         }
 992
 993         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 994         dbus_connection_set_change_sigpipe(FALSE);
 995
 996         /* Reset the console, but only if this is really init and we
 997          * are freshly booted */
 998         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 999                 console_setup(getpid() == 1 && !serialization);
1000                 make_null_stdio();
1001         }
1002
1003         /* Open the logging devices, if possible and necessary */
1004         log_open();
1005
1006         /* Make sure we leave a core dump without panicing the
1007          * kernel. */
1008         if (getpid() == 1)
1009                 install_crash_handler();
1010
1011         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1012                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1013
1014         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1015                 locale_setup();
1016
1017                 if (arg_show_status)
1018                         status_welcome();
1019
1020                 kmod_setup();
1021                 hostname_setup();
1022                 loopback_setup();
1023
1024                 mkdir_p("/dev/.systemd/ask-password/", 0755);
1025         }
1026
1027         if ((r = manager_new(arg_running_as, &m)) < 0) {
1028                 log_error("Failed to allocate manager object: %s", strerror(-r));
1029                 goto finish;
1030         }
1031
1032         m->confirm_spawn = arg_confirm_spawn;
1033         m->show_status = arg_show_status;
1034 #ifdef HAVE_SYSV_COMPAT
1035         m->sysv_console = arg_sysv_console;
1036 #endif
1037         m->mount_auto = arg_mount_auto;
1038         m->swap_auto = arg_swap_auto;
1039
1040         if (arg_console)
1041                 manager_set_console(m, arg_console);
1042
1043         if ((r = manager_startup(m, serialization, fds)) < 0)
1044                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1045
1046         if (fds) {
1047                 /* This will close all file descriptors that were opened, but
1048                  * not claimed by any unit. */
1049
1050                 fdset_free(fds);
1051                 fds = NULL;
1052         }
1053
1054         if (serialization) {
1055                 fclose(serialization);
1056                 serialization = NULL;
1057         } else {
1058                 DBusError error;
1059                 Unit *target = NULL;
1060
1061                 dbus_error_init(&error);
1062
1063                 log_debug("Activating default unit: %s", arg_default_unit);
1064
1065                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1066                         log_error("Failed to load default target: %s", bus_error(&error, r));
1067                         dbus_error_free(&error);
1068                 } else if (target->meta.load_state != UNIT_LOADED)
1069                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1070
1071                 if (!target || target->meta.load_state != UNIT_LOADED) {
1072                         log_info("Trying to load rescue target...");
1073
1074                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1075                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1076                                 dbus_error_free(&error);
1077                                 goto finish;
1078                         } else if (target->meta.load_state != UNIT_LOADED) {
1079                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1080                                 goto finish;
1081                         }
1082                 }
1083
1084                 if (arg_action == ACTION_TEST) {
1085                         printf("-> By units:\n");
1086                         manager_dump_units(m, stdout, "\t");
1087                 }
1088
1089                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1090                         log_error("Failed to start default target: %s", bus_error(&error, r));
1091                         dbus_error_free(&error);
1092                         goto finish;
1093                 }
1094
1095                 if (arg_action == ACTION_TEST) {
1096                         printf("-> By jobs:\n");
1097                         manager_dump_jobs(m, stdout, "\t");
1098                         retval = EXIT_SUCCESS;
1099                         goto finish;
1100                 }
1101         }
1102
1103         for (;;) {
1104                 if ((r = manager_loop(m)) < 0) {
1105                         log_error("Failed to run mainloop: %s", strerror(-r));
1106                         goto finish;
1107                 }
1108
1109                 switch (m->exit_code) {
1110
1111                 case MANAGER_EXIT:
1112                         retval = EXIT_SUCCESS;
1113                         log_debug("Exit.");
1114                         goto finish;
1115
1116                 case MANAGER_RELOAD:
1117                         log_info("Reloading.");
1118                         if ((r = manager_reload(m)) < 0)
1119                                 log_error("Failed to reload: %s", strerror(-r));
1120                         break;
1121
1122                 case MANAGER_REEXECUTE:
1123                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1124                                 goto finish;
1125
1126                         reexecute = true;
1127                         log_notice("Reexecuting.");
1128                         goto finish;
1129
1130                 default:
1131                         assert_not_reached("Unknown exit code.");
1132                 }
1133         }
1134
1135 finish:
1136         if (m)
1137                 manager_free(m);
1138
1139         free(arg_default_unit);
1140         free(arg_console);
1141
1142         dbus_shutdown();
1143
1144         label_finish();
1145
1146         if (reexecute) {
1147                 const char *args[15];
1148                 unsigned i = 0;
1149                 char sfd[16];
1150
1151                 assert(serialization);
1152                 assert(fds);
1153
1154                 args[i++] = SYSTEMD_BINARY_PATH;
1155
1156                 args[i++] = "--log-level";
1157                 args[i++] = log_level_to_string(log_get_max_level());
1158
1159                 args[i++] = "--log-target";
1160                 args[i++] = log_target_to_string(log_get_target());
1161
1162                 if (arg_running_as == MANAGER_SYSTEM)
1163                         args[i++] = "--system";
1164                 else
1165                         args[i++] = "--session";
1166
1167                 if (arg_dump_core)
1168                         args[i++] = "--dump-core";
1169
1170                 if (arg_crash_shell)
1171                         args[i++] = "--crash-shell";
1172
1173                 if (arg_confirm_spawn)
1174                         args[i++] = "--confirm-spawn";
1175
1176                 if (arg_show_status)
1177                         args[i++] = "--show-status=1";
1178                 else
1179                         args[i++] = "--show-status=0";
1180
1181 #ifdef HAVE_SYSV_COMPAT
1182                 if (arg_sysv_console)
1183                         args[i++] = "--sysv-console=1";
1184                 else
1185                         args[i++] = "--sysv-console=0";
1186 #endif
1187
1188                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1189                 char_array_0(sfd);
1190
1191                 args[i++] = "--deserialize";
1192                 args[i++] = sfd;
1193
1194                 args[i++] = NULL;
1195
1196                 assert(i <= ELEMENTSOF(args));
1197
1198                 execv(args[0], (char* const*) args);
1199
1200                 log_error("Failed to reexecute: %m");
1201         }
1202
1203         if (serialization)
1204                 fclose(serialization);
1205
1206         if (fds)
1207                 fdset_free(fds);
1208
1209         if (getpid() == 1)
1210                 freeze();
1211
1212         return retval;
1213 }