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 #include <sys/prctl.h>
  35
  36 #include "manager.h"
  37 #include "log.h"
  38 #include "mount-setup.h"
  39 #include "hostname-setup.h"
  40 #include "loopback-setup.h"
  41 #include "kmod-setup.h"
  42 #include "locale-setup.h"
  43 #include "selinux-setup.h"
  44 #include "load-fragment.h"
  45 #include "fdset.h"
  46 #include "special.h"
  47 #include "conf-parser.h"
  48 #include "bus-errors.h"
  49 #include "missing.h"
  50 #include "label.h"
  51 #include "build.h"
  52 #include "strv.h"
  53
  54 static enum {
  55         ACTION_RUN,
  56         ACTION_HELP,
  57         ACTION_TEST,
  58         ACTION_DUMP_CONFIGURATION_ITEMS,
  59         ACTION_DONE
  60 } arg_action = ACTION_RUN;
  61
  62 static char *arg_default_unit = NULL;
  63 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  64
  65 static bool arg_dump_core = true;
  66 static bool arg_crash_shell = false;
  67 static int arg_crash_chvt = -1;
  68 static bool arg_confirm_spawn = false;
  69 static bool arg_show_status = true;
  70 #ifdef HAVE_SYSV_COMPAT
  71 static bool arg_sysv_console = true;
  72 #endif
  73 static bool arg_mount_auto = true;
  74 static bool arg_swap_auto = true;
  75 static char **arg_default_controllers = NULL;
  76
  77 static FILE* serialization = NULL;
  78
  79 static void nop_handler(int sig) {
  80 }
  81
  82 _noreturn_ static void crash(int sig) {
  83
  84         if (!arg_dump_core)
  85                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  86         else {
  87                 struct sigaction sa;
  88                 pid_t pid;
  89
  90                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  91                 zero(sa);
  92                 sa.sa_handler = nop_handler;
  93                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  94                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  95
  96                 if ((pid = fork()) < 0)
  97                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  98
  99                 else if (pid == 0) {
 100                         struct rlimit rl;
 101
 102                         /* Enable default signal handler for core dump */
 103                         zero(sa);
 104                         sa.sa_handler = SIG_DFL;
 105                         assert_se(sigaction(sig, &sa, NULL) == 0);
 106
 107                         /* Don't limit the core dump size */
 108                         zero(rl);
 109                         rl.rlim_cur = RLIM_INFINITY;
 110                         rl.rlim_max = RLIM_INFINITY;
 111                         setrlimit(RLIMIT_CORE, &rl);
 112
 113                         /* Just to be sure... */
 114                         assert_se(chdir("/") == 0);
 115
 116                         /* Raise the signal again */
 117                         raise(sig);
 118
 119                         assert_not_reached("We shouldn't be here...");
 120                         _exit(1);
 121
 122                 } else {
 123                         siginfo_t status;
 124                         int r;
 125
 126                         /* Order things nicely. */
 127                         if ((r = wait_for_terminate(pid, &status)) < 0)
 128                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
 129                         else if (status.si_code != CLD_DUMPED)
 130                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 131                         else
 132                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 133                 }
 134         }
 135
 136         if (arg_crash_chvt)
 137                 chvt(arg_crash_chvt);
 138
 139         if (arg_crash_shell) {
 140                 struct sigaction sa;
 141                 pid_t pid;
 142
 143                 log_info("Executing crash shell in 10s...");
 144                 sleep(10);
 145
 146                 /* Let the kernel reap children for us */
 147                 zero(sa);
 148                 sa.sa_handler = SIG_IGN;
 149                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 150                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 151
 152                 if ((pid = fork()) < 0)
 153                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 154                 else if (pid == 0) {
 155                         int fd, r;
 156
 157                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 158                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 159                         else if ((r = make_stdio(fd)) < 0)
 160                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 161
 162                         execl("/bin/sh", "/bin/sh", NULL);
 163
 164                         log_error("execl() failed: %s", strerror(errno));
 165                         _exit(1);
 166                 }
 167
 168                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 169         }
 170
 171         log_info("Freezing execution.");
 172         freeze();
 173 }
 174
 175 static void install_crash_handler(void) {
 176         struct sigaction sa;
 177
 178         zero(sa);
 179
 180         sa.sa_handler = crash;
 181         sa.sa_flags = SA_NODEFER;
 182
 183         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 184 }
 185
 186 static int console_setup(bool do_reset) {
 187         int tty_fd, r;
 188
 189         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 190          * and make sure we don't have a controlling tty. */
 191
 192         release_terminal();
 193
 194         if (!do_reset)
 195                 return 0;
 196
 197         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 198                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 199                 return -tty_fd;
 200         }
 201
 202         if ((r = reset_terminal(tty_fd)) < 0)
 203                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 204
 205         close_nointr_nofail(tty_fd);
 206         return r;
 207 }
 208
 209 static int set_default_unit(const char *u) {
 210         char *c;
 211
 212         assert(u);
 213
 214         if (!(c = strdup(u)))
 215                 return -ENOMEM;
 216
 217         free(arg_default_unit);
 218         arg_default_unit = c;
 219         return 0;
 220 }
 221
 222 static int parse_proc_cmdline_word(const char *word) {
 223
 224         static const char * const rlmap[] = {
 225                 "emergency", SPECIAL_EMERGENCY_TARGET,
 226                 "single",    SPECIAL_RESCUE_TARGET,
 227                 "-s",        SPECIAL_RESCUE_TARGET,
 228                 "s",         SPECIAL_RESCUE_TARGET,
 229                 "S",         SPECIAL_RESCUE_TARGET,
 230                 "1",         SPECIAL_RESCUE_TARGET,
 231                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 232                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 233                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 234                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 235         };
 236
 237         assert(word);
 238
 239         if (startswith(word, "systemd.unit="))
 240                 return set_default_unit(word + 13);
 241
 242         else if (startswith(word, "systemd.log_target=")) {
 243
 244                 if (log_set_target_from_string(word + 19) < 0)
 245                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 246
 247         } else if (startswith(word, "systemd.log_level=")) {
 248
 249                 if (log_set_max_level_from_string(word + 18) < 0)
 250                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 251
 252         } else if (startswith(word, "systemd.log_color=")) {
 253
 254                 if (log_show_color_from_string(word + 18) < 0)
 255                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 256
 257         } else if (startswith(word, "systemd.log_location=")) {
 258
 259                 if (log_show_location_from_string(word + 21) < 0)
 260                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 261
 262         } else if (startswith(word, "systemd.dump_core=")) {
 263                 int r;
 264
 265                 if ((r = parse_boolean(word + 18)) < 0)
 266                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 267                 else
 268                         arg_dump_core = r;
 269
 270         } else if (startswith(word, "systemd.crash_shell=")) {
 271                 int r;
 272
 273                 if ((r = parse_boolean(word + 20)) < 0)
 274                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 275                 else
 276                         arg_crash_shell = r;
 277
 278         } else if (startswith(word, "systemd.confirm_spawn=")) {
 279                 int r;
 280
 281                 if ((r = parse_boolean(word + 22)) < 0)
 282                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 283                 else
 284                         arg_confirm_spawn = r;
 285
 286         } else if (startswith(word, "systemd.crash_chvt=")) {
 287                 int k;
 288
 289                 if (safe_atoi(word + 19, &k) < 0)
 290                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 291                 else
 292                         arg_crash_chvt = k;
 293
 294         } else if (startswith(word, "systemd.show_status=")) {
 295                 int r;
 296
 297                 if ((r = parse_boolean(word + 20)) < 0)
 298                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 299                 else
 300                         arg_show_status = r;
 301 #ifdef HAVE_SYSV_COMPAT
 302         } else if (startswith(word, "systemd.sysv_console=")) {
 303                 int r;
 304
 305                 if ((r = parse_boolean(word + 21)) < 0)
 306                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 307                 else
 308                         arg_sysv_console = r;
 309 #endif
 310
 311         } else if (startswith(word, "systemd.")) {
 312
 313                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 314
 315                 log_info("Supported kernel switches:\n"
 316                          "systemd.unit=UNIT                        Default unit to start\n"
 317                          "systemd.dump_core=0|1                    Dump core on crash\n"
 318                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 319                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 320                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 321                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 322 #ifdef HAVE_SYSV_COMPAT
 323                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 324 #endif
 325                          "systemd.log_target=console|kmsg|syslog|syslog-or-kmsg|null\n"
 326                          "                                         Log target\n"
 327                          "systemd.log_level=LEVEL                  Log level\n"
 328                          "systemd.log_color=0|1                    Highlight important log messages\n"
 329                          "systemd.log_location=0|1                 Include code location in log messages\n");
 330
 331         } else if (streq(word, "quiet")) {
 332                 arg_show_status = false;
 333 #ifdef HAVE_SYSV_COMPAT
 334                 arg_sysv_console = false;
 335 #endif
 336         } else {
 337                 unsigned i;
 338
 339                 /* SysV compatibility */
 340                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 341                         if (streq(word, rlmap[i]))
 342                                 return set_default_unit(rlmap[i+1]);
 343         }
 344
 345         return 0;
 346 }
 347
 348 static int config_parse_level(
 349                 const char *filename,
 350                 unsigned line,
 351                 const char *section,
 352                 const char *lvalue,
 353                 const char *rvalue,
 354                 void *data,
 355                 void *userdata) {
 356
 357         assert(filename);
 358         assert(lvalue);
 359         assert(rvalue);
 360
 361         log_set_max_level_from_string(rvalue);
 362         return 0;
 363 }
 364
 365 static int config_parse_target(
 366                 const char *filename,
 367                 unsigned line,
 368                 const char *section,
 369                 const char *lvalue,
 370                 const char *rvalue,
 371                 void *data,
 372                 void *userdata) {
 373
 374         assert(filename);
 375         assert(lvalue);
 376         assert(rvalue);
 377
 378         log_set_target_from_string(rvalue);
 379         return 0;
 380 }
 381
 382 static int config_parse_color(
 383                 const char *filename,
 384                 unsigned line,
 385                 const char *section,
 386                 const char *lvalue,
 387                 const char *rvalue,
 388                 void *data,
 389                 void *userdata) {
 390
 391         assert(filename);
 392         assert(lvalue);
 393         assert(rvalue);
 394
 395         log_show_color_from_string(rvalue);
 396         return 0;
 397 }
 398
 399 static int config_parse_location(
 400                 const char *filename,
 401                 unsigned line,
 402                 const char *section,
 403                 const char *lvalue,
 404                 const char *rvalue,
 405                 void *data,
 406                 void *userdata) {
 407
 408         assert(filename);
 409         assert(lvalue);
 410         assert(rvalue);
 411
 412         log_show_location_from_string(rvalue);
 413         return 0;
 414 }
 415
 416 static int config_parse_cpu_affinity(
 417                 const char *filename,
 418                 unsigned line,
 419                 const char *section,
 420                 const char *lvalue,
 421                 const char *rvalue,
 422                 void *data,
 423                 void *userdata) {
 424
 425         char *w;
 426         size_t l;
 427         char *state;
 428         cpu_set_t *c = NULL;
 429         unsigned ncpus = 0;
 430
 431         assert(filename);
 432         assert(lvalue);
 433         assert(rvalue);
 434
 435         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 436                 char *t;
 437                 int r;
 438                 unsigned cpu;
 439
 440                 if (!(t = strndup(w, l)))
 441                         return -ENOMEM;
 442
 443                 r = safe_atou(t, &cpu);
 444                 free(t);
 445
 446                 if (!c)
 447                         if (!(c = cpu_set_malloc(&ncpus)))
 448                                 return -ENOMEM;
 449
 450                 if (r < 0 || cpu >= ncpus) {
 451                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 452                         CPU_FREE(c);
 453                         return -EBADMSG;
 454                 }
 455
 456                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 457         }
 458
 459         if (c) {
 460                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 461                         log_warning("Failed to set CPU affinity: %m");
 462
 463                 CPU_FREE(c);
 464         }
 465
 466         return 0;
 467 }
 468
 469 static int parse_config_file(void) {
 470
 471         const ConfigItem items[] = {
 472                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 473                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 474                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 475                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 476                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 477                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 478                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 479 #ifdef HAVE_SYSV_COMPAT
 480                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 481 #endif
 482                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 483                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 484                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 485                 { "SwapAuto",    config_parse_bool,         &arg_swap_auto,     "Manager" },
 486                 { "DefaultControllers", config_parse_strv,  &arg_default_controllers, "Manager" },
 487                 { NULL, NULL, NULL, NULL }
 488         };
 489
 490         static const char * const sections[] = {
 491                 "Manager",
 492                 NULL
 493         };
 494
 495         FILE *f;
 496         const char *fn;
 497         int r;
 498
 499         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE;
 500
 501         if (!(f = fopen(fn, "re"))) {
 502                 if (errno == ENOENT)
 503                         return 0;
 504
 505                 log_warning("Failed to open configuration file '%s': %m", fn);
 506                 return 0;
 507         }
 508
 509         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 510                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 511
 512         fclose(f);
 513
 514         return 0;
 515 }
 516
 517 static int parse_proc_cmdline(void) {
 518         char *line, *w, *state;
 519         int r;
 520         size_t l;
 521
 522         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 523                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 524                 return 0;
 525         }
 526
 527         FOREACH_WORD_QUOTED(w, l, line, state) {
 528                 char *word;
 529
 530                 if (!(word = strndup(w, l))) {
 531                         r = -ENOMEM;
 532                         goto finish;
 533                 }
 534
 535                 r = parse_proc_cmdline_word(word);
 536                 free(word);
 537
 538                 if (r < 0)
 539                         goto finish;
 540         }
 541
 542         r = 0;
 543
 544 finish:
 545         free(line);
 546         return r;
 547 }
 548
 549 static int parse_argv(int argc, char *argv[]) {
 550
 551         enum {
 552                 ARG_LOG_LEVEL = 0x100,
 553                 ARG_LOG_TARGET,
 554                 ARG_LOG_COLOR,
 555                 ARG_LOG_LOCATION,
 556                 ARG_UNIT,
 557                 ARG_SYSTEM,
 558                 ARG_USER,
 559                 ARG_TEST,
 560                 ARG_DUMP_CONFIGURATION_ITEMS,
 561                 ARG_DUMP_CORE,
 562                 ARG_CRASH_SHELL,
 563                 ARG_CONFIRM_SPAWN,
 564                 ARG_SHOW_STATUS,
 565                 ARG_SYSV_CONSOLE,
 566                 ARG_DESERIALIZE,
 567                 ARG_INTROSPECT
 568         };
 569
 570         static const struct option options[] = {
 571                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 572                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 573                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 574                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 575                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 576                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 577                 { "user",                     no_argument,       NULL, ARG_USER                     },
 578                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 579                 { "help",                     no_argument,       NULL, 'h'                          },
 580                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 581                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 582                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 583                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 584                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 585 #ifdef HAVE_SYSV_COMPAT
 586                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 587 #endif
 588                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 589                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 590                 { NULL,                       0,                 NULL, 0                            }
 591         };
 592
 593         int c, r;
 594
 595         assert(argc >= 1);
 596         assert(argv);
 597
 598         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 599
 600                 switch (c) {
 601
 602                 case ARG_LOG_LEVEL:
 603                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 604                                 log_error("Failed to parse log level %s.", optarg);
 605                                 return r;
 606                         }
 607
 608                         break;
 609
 610                 case ARG_LOG_TARGET:
 611
 612                         if ((r = log_set_target_from_string(optarg)) < 0) {
 613                                 log_error("Failed to parse log target %s.", optarg);
 614                                 return r;
 615                         }
 616
 617                         break;
 618
 619                 case ARG_LOG_COLOR:
 620
 621                         if (optarg) {
 622                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 623                                         log_error("Failed to parse log color setting %s.", optarg);
 624                                         return r;
 625                                 }
 626                         } else
 627                                 log_show_color(true);
 628
 629                         break;
 630
 631                 case ARG_LOG_LOCATION:
 632
 633                         if (optarg) {
 634                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 635                                         log_error("Failed to parse log location setting %s.", optarg);
 636                                         return r;
 637                                 }
 638                         } else
 639                                 log_show_location(true);
 640
 641                         break;
 642
 643                 case ARG_UNIT:
 644
 645                         if ((r = set_default_unit(optarg)) < 0) {
 646                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 647                                 return r;
 648                         }
 649
 650                         break;
 651
 652                 case ARG_SYSTEM:
 653                         arg_running_as = MANAGER_SYSTEM;
 654                         break;
 655
 656                 case ARG_USER:
 657                         arg_running_as = MANAGER_USER;
 658                         break;
 659
 660                 case ARG_TEST:
 661                         arg_action = ACTION_TEST;
 662                         break;
 663
 664                 case ARG_DUMP_CONFIGURATION_ITEMS:
 665                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 666                         break;
 667
 668                 case ARG_DUMP_CORE:
 669                         arg_dump_core = true;
 670                         break;
 671
 672                 case ARG_CRASH_SHELL:
 673                         arg_crash_shell = true;
 674                         break;
 675
 676                 case ARG_CONFIRM_SPAWN:
 677                         arg_confirm_spawn = true;
 678                         break;
 679
 680                 case ARG_SHOW_STATUS:
 681
 682                         if (optarg) {
 683                                 if ((r = parse_boolean(optarg)) < 0) {
 684                                         log_error("Failed to show status boolean %s.", optarg);
 685                                         return r;
 686                                 }
 687                                 arg_show_status = r;
 688                         } else
 689                                 arg_show_status = true;
 690                         break;
 691 #ifdef HAVE_SYSV_COMPAT
 692                 case ARG_SYSV_CONSOLE:
 693
 694                         if (optarg) {
 695                                 if ((r = parse_boolean(optarg)) < 0) {
 696                                         log_error("Failed to SysV console boolean %s.", optarg);
 697                                         return r;
 698                                 }
 699                                 arg_sysv_console = r;
 700                         } else
 701                                 arg_sysv_console = true;
 702                         break;
 703 #endif
 704
 705                 case ARG_DESERIALIZE: {
 706                         int fd;
 707                         FILE *f;
 708
 709                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 710                                 log_error("Failed to parse deserialize option %s.", optarg);
 711                                 return r;
 712                         }
 713
 714                         if (!(f = fdopen(fd, "r"))) {
 715                                 log_error("Failed to open serialization fd: %m");
 716                                 return r;
 717                         }
 718
 719                         if (serialization)
 720                                 fclose(serialization);
 721
 722                         serialization = f;
 723
 724                         break;
 725                 }
 726
 727                 case ARG_INTROSPECT: {
 728                         const char * const * i = NULL;
 729
 730                         for (i = bus_interface_table; *i; i += 2)
 731                                 if (!optarg || streq(i[0], optarg)) {
 732                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 733                                               "<node>\n", stdout);
 734                                         fputs(i[1], stdout);
 735                                         fputs("</node>\n", stdout);
 736
 737                                         if (optarg)
 738                                                 break;
 739                                 }
 740
 741                         if (!i[0] && optarg)
 742                                 log_error("Unknown interface %s.", optarg);
 743
 744                         arg_action = ACTION_DONE;
 745                         break;
 746                 }
 747
 748                 case 'h':
 749                         arg_action = ACTION_HELP;
 750                         break;
 751
 752                 case 'D':
 753                         log_set_max_level(LOG_DEBUG);
 754                         break;
 755
 756                 case '?':
 757                         return -EINVAL;
 758
 759                 default:
 760                         log_error("Unknown option code %c", c);
 761                         return -EINVAL;
 762                 }
 763
 764         /* PID 1 will get the kernel arguments as parameters, which we
 765          * ignore and unconditionally read from
 766          * /proc/cmdline. However, we need to ignore those arguments
 767          * here. */
 768         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 769                 log_error("Excess arguments.");
 770                 return -EINVAL;
 771         }
 772
 773         return 0;
 774 }
 775
 776 static int help(void) {
 777
 778         printf("%s [OPTIONS...]\n\n"
 779                "Starts up and maintains the system or user services.\n\n"
 780                "  -h --help                      Show this help\n"
 781                "     --test                      Determine startup sequence, dump it and exit\n"
 782                "     --dump-configuration-items  Dump understood unit configuration items\n"
 783                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 784                "     --unit=UNIT                 Set default unit\n"
 785                "     --system                    Run a system instance, even if PID != 1\n"
 786                "     --user                      Run a user instance\n"
 787                "     --dump-core                 Dump core on crash\n"
 788                "     --crash-shell               Run shell on crash\n"
 789                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 790                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 791 #ifdef HAVE_SYSV_COMPAT
 792                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 793 #endif
 794                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 795                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 796                "     --log-color[=0|1]           Highlight important log messages\n"
 797                "     --log-location[=0|1]        Include code location in log messages\n",
 798                program_invocation_short_name);
 799
 800         return 0;
 801 }
 802
 803 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 804         FILE *f = NULL;
 805         FDSet *fds = NULL;
 806         int r;
 807
 808         assert(m);
 809         assert(_f);
 810         assert(_fds);
 811
 812         if ((r = manager_open_serialization(m, &f)) < 0) {
 813                 log_error("Failed to create serialization faile: %s", strerror(-r));
 814                 goto fail;
 815         }
 816
 817         if (!(fds = fdset_new())) {
 818                 r = -ENOMEM;
 819                 log_error("Failed to allocate fd set: %s", strerror(-r));
 820                 goto fail;
 821         }
 822
 823         if ((r = manager_serialize(m, f, fds)) < 0) {
 824                 log_error("Failed to serialize state: %s", strerror(-r));
 825                 goto fail;
 826         }
 827
 828         if (fseeko(f, 0, SEEK_SET) < 0) {
 829                 log_error("Failed to rewind serialization fd: %m");
 830                 goto fail;
 831         }
 832
 833         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 834                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 835                 goto fail;
 836         }
 837
 838         if ((r = fdset_cloexec(fds, false)) < 0) {
 839                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 840                 goto fail;
 841         }
 842
 843         *_f = f;
 844         *_fds = fds;
 845
 846         return 0;
 847
 848 fail:
 849         fdset_free(fds);
 850
 851         if (f)
 852                 fclose(f);
 853
 854         return r;
 855 }
 856
 857 static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
 858         const char *e;
 859         unsigned long long a, b;
 860
 861         assert(t);
 862
 863         if (!(e = getenv("RD_TIMESTAMP")))
 864                 return NULL;
 865
 866         if (sscanf(e, "%llu %llu", &a, &b) != 2)
 867                 return NULL;
 868
 869         t->realtime = (usec_t) a;
 870         t->monotonic = (usec_t) b;
 871
 872         return t;
 873 }
 874
 875 static void test_mtab(void) {
 876         char *p;
 877
 878         if (readlink_malloc("/etc/mtab", &p) >= 0) {
 879                 bool b;
 880
 881                 b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");
 882                 free(p);
 883
 884                 if (b)
 885                         return;
 886         }
 887
 888         log_error("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
 889                   "This is not supported anymore. "
 890                   "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
 891 }
 892
 893 int main(int argc, char *argv[]) {
 894         Manager *m = NULL;
 895         int r, retval = EXIT_FAILURE;
 896         FDSet *fds = NULL;
 897         bool reexecute = false;
 898         const char *shutdown_verb = NULL;
 899         dual_timestamp initrd_timestamp = { 0ULL, 0ULL };
 900         char systemd[] = "systemd";
 901
 902         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 903                 /* This is compatbility support for SysV, where
 904                  * calling init as a user is identical to telinit. */
 905
 906                 errno = -ENOENT;
 907                 execv(SYSTEMCTL_BINARY_PATH, argv);
 908                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 909                 return 1;
 910         }
 911
 912         /* If we get started via the /sbin/init symlink then we are
 913            called 'init'. After a subsequent reexecution we are then
 914            called 'systemd'. That is confusing, hence let's call us
 915            systemd right-away. */
 916
 917         program_invocation_short_name = systemd;
 918         prctl(PR_SET_NAME, systemd);
 919
 920         log_show_color(isatty(STDERR_FILENO) > 0);
 921         log_show_location(false);
 922         log_set_max_level(LOG_INFO);
 923
 924         if (getpid() == 1) {
 925                 arg_running_as = MANAGER_SYSTEM;
 926                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 927
 928                 /* This might actually not return, but cause a
 929                  * reexecution */
 930                 if (selinux_setup(argv) < 0)
 931                         goto finish;
 932
 933                 if (label_init() < 0)
 934                         goto finish;
 935         } else {
 936                 arg_running_as = MANAGER_USER;
 937                 log_set_target(LOG_TARGET_CONSOLE);
 938         }
 939
 940         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 941                 goto finish;
 942
 943         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 944          * /proc/$PID/fd is available. */
 945         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 946                 if (mount_setup() < 0)
 947                         goto finish;
 948
 949         /* Reset all signal handlers. */
 950         assert_se(reset_all_signal_handlers() == 0);
 951
 952         /* If we are init, we can block sigkill. Yay. */
 953         ignore_signals(SIGNALS_IGNORE, -1);
 954
 955         if (parse_config_file() < 0)
 956                 goto finish;
 957
 958         if (arg_running_as == MANAGER_SYSTEM)
 959                 if (parse_proc_cmdline() < 0)
 960                         goto finish;
 961
 962         log_parse_environment();
 963
 964         if (parse_argv(argc, argv) < 0)
 965                 goto finish;
 966
 967         /* If Plymouth is being run make sure we show the status, so
 968          * that there's something nice to see when people press Esc */
 969         if (access("/dev/.systemd/plymouth", F_OK) >= 0)
 970                 arg_show_status = true;
 971
 972         if (arg_action == ACTION_HELP) {
 973                 retval = help();
 974                 goto finish;
 975         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 976                 unit_dump_config_items(stdout);
 977                 retval = EXIT_SUCCESS;
 978                 goto finish;
 979         } else if (arg_action == ACTION_DONE) {
 980                 retval = EXIT_SUCCESS;
 981                 goto finish;
 982         }
 983
 984         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 985
 986         /* Remember open file descriptors for later deserialization */
 987         if (serialization) {
 988                 if ((r = fdset_new_fill(&fds)) < 0) {
 989                         log_error("Failed to allocate fd set: %s", strerror(-r));
 990                         goto finish;
 991                 }
 992
 993                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 994         } else
 995                 close_all_fds(NULL, 0);
 996
 997         /* Set up PATH unless it is already set */
 998         setenv("PATH",
 999                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
1000                arg_running_as == MANAGER_SYSTEM);
1001
1002         if (arg_running_as == MANAGER_SYSTEM) {
1003                 /* Parse the data passed to us by the initrd and unset it */
1004                 parse_initrd_timestamp(&initrd_timestamp);
1005                 filter_environ("RD_");
1006
1007                 /* Unset some environment variables passed in from the
1008                  * kernel that don't really make sense for us. */
1009                 unsetenv("HOME");
1010                 unsetenv("TERM");
1011         }
1012
1013         /* Move out of the way, so that we won't block unmounts */
1014         assert_se(chdir("/")  == 0);
1015
1016         if (arg_running_as == MANAGER_SYSTEM) {
1017                 /* Become a session leader if we aren't one yet. */
1018                 setsid();
1019
1020                 /* Disable the umask logic */
1021                 umask(0);
1022         }
1023
1024         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
1025         dbus_connection_set_change_sigpipe(FALSE);
1026
1027         /* Reset the console, but only if this is really init and we
1028          * are freshly booted */
1029         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
1030                 console_setup(getpid() == 1 && !serialization);
1031                 make_null_stdio();
1032         }
1033
1034         /* Open the logging devices, if possible and necessary */
1035         log_open();
1036
1037         /* Make sure we leave a core dump without panicing the
1038          * kernel. */
1039         if (getpid() == 1)
1040                 install_crash_handler();
1041
1042         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1043                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1044
1045         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1046                 locale_setup();
1047
1048                 if (arg_show_status)
1049                         status_welcome();
1050
1051                 kmod_setup();
1052                 hostname_setup();
1053                 loopback_setup();
1054
1055                 mkdir_p("/dev/.systemd/ask-password/", 0755);
1056
1057                 test_mtab();
1058         }
1059
1060         if ((r = manager_new(arg_running_as, &m)) < 0) {
1061                 log_error("Failed to allocate manager object: %s", strerror(-r));
1062                 goto finish;
1063         }
1064
1065         m->confirm_spawn = arg_confirm_spawn;
1066         m->show_status = arg_show_status;
1067 #ifdef HAVE_SYSV_COMPAT
1068         m->sysv_console = arg_sysv_console;
1069 #endif
1070         m->mount_auto = arg_mount_auto;
1071         m->swap_auto = arg_swap_auto;
1072
1073         if (dual_timestamp_is_set(&initrd_timestamp))
1074                 m->initrd_timestamp = initrd_timestamp;
1075
1076         if (arg_default_controllers)
1077                 manager_set_default_controllers(m, arg_default_controllers);
1078
1079         if ((r = manager_startup(m, serialization, fds)) < 0)
1080                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1081
1082         if (fds) {
1083                 /* This will close all file descriptors that were opened, but
1084                  * not claimed by any unit. */
1085
1086                 fdset_free(fds);
1087                 fds = NULL;
1088         }
1089
1090         if (serialization) {
1091                 fclose(serialization);
1092                 serialization = NULL;
1093         } else {
1094                 DBusError error;
1095                 Unit *target = NULL;
1096
1097                 dbus_error_init(&error);
1098
1099                 log_debug("Activating default unit: %s", arg_default_unit);
1100
1101                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1102                         log_error("Failed to load default target: %s", bus_error(&error, r));
1103                         dbus_error_free(&error);
1104                 } else if (target->meta.load_state == UNIT_ERROR)
1105                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1106                 else if (target->meta.load_state == UNIT_MASKED)
1107                         log_error("Default target masked.");
1108
1109                 if (!target || target->meta.load_state != UNIT_LOADED) {
1110                         log_info("Trying to load rescue target...");
1111
1112                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1113                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1114                                 dbus_error_free(&error);
1115                                 goto finish;
1116                         } else if (target->meta.load_state == UNIT_ERROR) {
1117                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1118                                 goto finish;
1119                         } else if (target->meta.load_state == UNIT_MASKED) {
1120                                 log_error("Rescue target masked.");
1121                                 goto finish;
1122                         }
1123                 }
1124
1125                 assert(target->meta.load_state == UNIT_LOADED);
1126
1127                 if (arg_action == ACTION_TEST) {
1128                         printf("-> By units:\n");
1129                         manager_dump_units(m, stdout, "\t");
1130                 }
1131
1132                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1133                         log_error("Failed to start default target: %s", bus_error(&error, r));
1134                         dbus_error_free(&error);
1135                         goto finish;
1136                 }
1137
1138                 if (arg_action == ACTION_TEST) {
1139                         printf("-> By jobs:\n");
1140                         manager_dump_jobs(m, stdout, "\t");
1141                         retval = EXIT_SUCCESS;
1142                         goto finish;
1143                 }
1144         }
1145
1146         for (;;) {
1147                 if ((r = manager_loop(m)) < 0) {
1148                         log_error("Failed to run mainloop: %s", strerror(-r));
1149                         goto finish;
1150                 }
1151
1152                 switch (m->exit_code) {
1153
1154                 case MANAGER_EXIT:
1155                         retval = EXIT_SUCCESS;
1156                         log_debug("Exit.");
1157                         goto finish;
1158
1159                 case MANAGER_RELOAD:
1160                         log_info("Reloading.");
1161                         if ((r = manager_reload(m)) < 0)
1162                                 log_error("Failed to reload: %s", strerror(-r));
1163                         break;
1164
1165                 case MANAGER_REEXECUTE:
1166                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1167                                 goto finish;
1168
1169                         reexecute = true;
1170                         log_notice("Reexecuting.");
1171                         goto finish;
1172
1173                 case MANAGER_REBOOT:
1174                 case MANAGER_POWEROFF:
1175                 case MANAGER_HALT:
1176                 case MANAGER_KEXEC: {
1177                         static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1178                                 [MANAGER_REBOOT] = "reboot",
1179                                 [MANAGER_POWEROFF] = "poweroff",
1180                                 [MANAGER_HALT] = "halt",
1181                                 [MANAGER_KEXEC] = "kexec"
1182                         };
1183
1184                         assert_se(shutdown_verb = table[m->exit_code]);
1185
1186                         log_notice("Shutting down.");
1187                         goto finish;
1188                 }
1189
1190                 default:
1191                         assert_not_reached("Unknown exit code.");
1192                 }
1193         }
1194
1195 finish:
1196         if (m)
1197                 manager_free(m);
1198
1199         free(arg_default_unit);
1200         strv_free(arg_default_controllers);
1201
1202         dbus_shutdown();
1203
1204         label_finish();
1205
1206         if (reexecute) {
1207                 const char *args[15];
1208                 unsigned i = 0;
1209                 char sfd[16];
1210
1211                 assert(serialization);
1212                 assert(fds);
1213
1214                 args[i++] = SYSTEMD_BINARY_PATH;
1215
1216                 args[i++] = "--log-level";
1217                 args[i++] = log_level_to_string(log_get_max_level());
1218
1219                 args[i++] = "--log-target";
1220                 args[i++] = log_target_to_string(log_get_target());
1221
1222                 if (arg_running_as == MANAGER_SYSTEM)
1223                         args[i++] = "--system";
1224                 else
1225                         args[i++] = "--user";
1226
1227                 if (arg_dump_core)
1228                         args[i++] = "--dump-core";
1229
1230                 if (arg_crash_shell)
1231                         args[i++] = "--crash-shell";
1232
1233                 if (arg_confirm_spawn)
1234                         args[i++] = "--confirm-spawn";
1235
1236                 if (arg_show_status)
1237                         args[i++] = "--show-status=1";
1238                 else
1239                         args[i++] = "--show-status=0";
1240
1241 #ifdef HAVE_SYSV_COMPAT
1242                 if (arg_sysv_console)
1243                         args[i++] = "--sysv-console=1";
1244                 else
1245                         args[i++] = "--sysv-console=0";
1246 #endif
1247
1248                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1249                 char_array_0(sfd);
1250
1251                 args[i++] = "--deserialize";
1252                 args[i++] = sfd;
1253
1254                 args[i++] = NULL;
1255
1256                 assert(i <= ELEMENTSOF(args));
1257
1258                 execv(args[0], (char* const*) args);
1259
1260                 log_error("Failed to reexecute: %m");
1261         }
1262
1263         if (serialization)
1264                 fclose(serialization);
1265
1266         if (fds)
1267                 fdset_free(fds);
1268
1269         if (shutdown_verb) {
1270                 const char * command_line[] = {
1271                         SYSTEMD_SHUTDOWN_BINARY_PATH,
1272                         shutdown_verb,
1273                         NULL
1274                 };
1275
1276                 execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line);
1277                 log_error("Failed to execute shutdown binary, freezing: %m");
1278         }
1279
1280         if (getpid() == 1)
1281                 freeze();
1282
1283         return retval;
1284 }