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 static void nop_handler(int sig) {
  77 }
  78
  79 _noreturn_ static void crash(int sig) {
  80
  81         if (!arg_dump_core)
  82                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  83         else {
  84                 struct sigaction sa;
  85                 pid_t pid;
  86
  87                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  88                 zero(sa);
  89                 sa.sa_handler = nop_handler;
  90                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  91                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  92
  93                 if ((pid = fork()) < 0)
  94                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
  95
  96                 else if (pid == 0) {
  97                         struct rlimit rl;
  98
  99                         /* Enable default signal handler for core dump */
 100                         zero(sa);
 101                         sa.sa_handler = SIG_DFL;
 102                         assert_se(sigaction(sig, &sa, NULL) == 0);
 103
 104                         /* Don't limit the core dump size */
 105                         zero(rl);
 106                         rl.rlim_cur = RLIM_INFINITY;
 107                         rl.rlim_max = RLIM_INFINITY;
 108                         setrlimit(RLIMIT_CORE, &rl);
 109
 110                         /* Just to be sure... */
 111                         assert_se(chdir("/") == 0);
 112
 113                         /* Raise the signal again */
 114                         raise(sig);
 115
 116                         assert_not_reached("We shouldn't be here...");
 117                         _exit(1);
 118
 119                 } else {
 120                         siginfo_t status;
 121                         int r;
 122
 123                         /* Order things nicely. */
 124                         if ((r = wait_for_terminate(pid, &status)) < 0)
 125                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
 126                         else if (status.si_code != CLD_DUMPED)
 127                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 128                         else
 129                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 130                 }
 131         }
 132
 133         if (arg_crash_chvt)
 134                 chvt(arg_crash_chvt);
 135
 136         if (arg_crash_shell) {
 137                 struct sigaction sa;
 138                 pid_t pid;
 139
 140                 log_info("Executing crash shell in 10s...");
 141                 sleep(10);
 142
 143                 /* Let the kernel reap children for us */
 144                 zero(sa);
 145                 sa.sa_handler = SIG_IGN;
 146                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 147                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 148
 149                 if ((pid = fork()) < 0)
 150                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 151                 else if (pid == 0) {
 152                         int fd, r;
 153
 154                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 155                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 156                         else if ((r = make_stdio(fd)) < 0)
 157                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 158
 159                         execl("/bin/sh", "/bin/sh", NULL);
 160
 161                         log_error("execl() failed: %s", strerror(errno));
 162                         _exit(1);
 163                 }
 164
 165                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 166         }
 167
 168         log_info("Freezing execution.");
 169         freeze();
 170 }
 171
 172 static void install_crash_handler(void) {
 173         struct sigaction sa;
 174
 175         zero(sa);
 176
 177         sa.sa_handler = crash;
 178         sa.sa_flags = SA_NODEFER;
 179
 180         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 181 }
 182
 183 static int console_setup(bool do_reset) {
 184         int tty_fd, r;
 185
 186         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 187          * and make sure we don't have a controlling tty. */
 188
 189         release_terminal();
 190
 191         if (!do_reset)
 192                 return 0;
 193
 194         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 195                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 196                 return -tty_fd;
 197         }
 198
 199         if ((r = reset_terminal(tty_fd)) < 0)
 200                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 201
 202         close_nointr_nofail(tty_fd);
 203         return r;
 204 }
 205
 206 static int set_default_unit(const char *u) {
 207         char *c;
 208
 209         assert(u);
 210
 211         if (!(c = strdup(u)))
 212                 return -ENOMEM;
 213
 214         free(arg_default_unit);
 215         arg_default_unit = c;
 216         return 0;
 217 }
 218
 219 static int parse_proc_cmdline_word(const char *word) {
 220
 221         static const char * const rlmap[] = {
 222                 "emergency", SPECIAL_EMERGENCY_TARGET,
 223                 "single",    SPECIAL_RESCUE_TARGET,
 224                 "-s",        SPECIAL_RESCUE_TARGET,
 225                 "s",         SPECIAL_RESCUE_TARGET,
 226                 "S",         SPECIAL_RESCUE_TARGET,
 227                 "1",         SPECIAL_RESCUE_TARGET,
 228                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 229                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 230                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 231                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 232         };
 233
 234         assert(word);
 235
 236         if (startswith(word, "systemd.unit="))
 237                 return set_default_unit(word + 13);
 238
 239         else if (startswith(word, "systemd.log_target=")) {
 240
 241                 if (log_set_target_from_string(word + 19) < 0)
 242                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 243
 244         } else if (startswith(word, "systemd.log_level=")) {
 245
 246                 if (log_set_max_level_from_string(word + 18) < 0)
 247                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 248
 249         } else if (startswith(word, "systemd.log_color=")) {
 250
 251                 if (log_show_color_from_string(word + 18) < 0)
 252                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 253
 254         } else if (startswith(word, "systemd.log_location=")) {
 255
 256                 if (log_show_location_from_string(word + 21) < 0)
 257                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 258
 259         } else if (startswith(word, "systemd.dump_core=")) {
 260                 int r;
 261
 262                 if ((r = parse_boolean(word + 18)) < 0)
 263                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 264                 else
 265                         arg_dump_core = r;
 266
 267         } else if (startswith(word, "systemd.crash_shell=")) {
 268                 int r;
 269
 270                 if ((r = parse_boolean(word + 20)) < 0)
 271                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 272                 else
 273                         arg_crash_shell = r;
 274
 275         } else if (startswith(word, "systemd.confirm_spawn=")) {
 276                 int r;
 277
 278                 if ((r = parse_boolean(word + 22)) < 0)
 279                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 280                 else
 281                         arg_confirm_spawn = r;
 282
 283         } else if (startswith(word, "systemd.crash_chvt=")) {
 284                 int k;
 285
 286                 if (safe_atoi(word + 19, &k) < 0)
 287                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 288                 else
 289                         arg_crash_chvt = k;
 290
 291         } else if (startswith(word, "systemd.show_status=")) {
 292                 int r;
 293
 294                 if ((r = parse_boolean(word + 20)) < 0)
 295                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 296                 else
 297                         arg_show_status = r;
 298 #ifdef HAVE_SYSV_COMPAT
 299         } else if (startswith(word, "systemd.sysv_console=")) {
 300                 int r;
 301
 302                 if ((r = parse_boolean(word + 21)) < 0)
 303                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 304                 else
 305                         arg_sysv_console = r;
 306 #endif
 307
 308         } else if (startswith(word, "systemd.")) {
 309
 310                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 311
 312                 log_info("Supported kernel switches:\n"
 313                          "systemd.unit=UNIT                        Default unit to start\n"
 314                          "systemd.dump_core=0|1                    Dump core on crash\n"
 315                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 316                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 317                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 318                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 319 #ifdef HAVE_SYSV_COMPAT
 320                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 321 #endif
 322                          "systemd.log_target=console|kmsg|syslog|syslog-or-kmsg|null\n"
 323                          "                                         Log target\n"
 324                          "systemd.log_level=LEVEL                  Log level\n"
 325                          "systemd.log_color=0|1                    Highlight important log messages\n"
 326                          "systemd.log_location=0|1                 Include code location in log messages\n");
 327
 328         } else if (startswith(word, "console=")) {
 329                 const char *k;
 330                 size_t l;
 331                 char *w = NULL;
 332
 333                 k = word + 8;
 334                 l = strcspn(k, ",");
 335
 336                 /* Ignore the console setting if set to a VT */
 337                 if (l < 4 ||
 338                     !startswith(k, "tty") ||
 339                     k[3+strspn(k+3, "0123456789")] != 0) {
 340
 341                         if (!(w = strndup(k, l)))
 342                                 return -ENOMEM;
 343                 }
 344
 345                 free(arg_console);
 346                 arg_console = w;
 347
 348         } else if (streq(word, "quiet")) {
 349                 arg_show_status = false;
 350 #ifdef HAVE_SYSV_COMPAT
 351                 arg_sysv_console = false;
 352 #endif
 353         } else {
 354                 unsigned i;
 355
 356                 /* SysV compatibility */
 357                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 358                         if (streq(word, rlmap[i]))
 359                                 return set_default_unit(rlmap[i+1]);
 360         }
 361
 362         return 0;
 363 }
 364
 365 static int config_parse_level(
 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_max_level_from_string(rvalue);
 379         return 0;
 380 }
 381
 382 static int config_parse_target(
 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_set_target_from_string(rvalue);
 396         return 0;
 397 }
 398
 399 static int config_parse_color(
 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_color_from_string(rvalue);
 413         return 0;
 414 }
 415
 416 static int config_parse_location(
 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         assert(filename);
 426         assert(lvalue);
 427         assert(rvalue);
 428
 429         log_show_location_from_string(rvalue);
 430         return 0;
 431 }
 432
 433 static int config_parse_cpu_affinity(
 434                 const char *filename,
 435                 unsigned line,
 436                 const char *section,
 437                 const char *lvalue,
 438                 const char *rvalue,
 439                 void *data,
 440                 void *userdata) {
 441
 442         char *w;
 443         size_t l;
 444         char *state;
 445         cpu_set_t *c = NULL;
 446         unsigned ncpus = 0;
 447
 448         assert(filename);
 449         assert(lvalue);
 450         assert(rvalue);
 451
 452         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 453                 char *t;
 454                 int r;
 455                 unsigned cpu;
 456
 457                 if (!(t = strndup(w, l)))
 458                         return -ENOMEM;
 459
 460                 r = safe_atou(t, &cpu);
 461                 free(t);
 462
 463                 if (!c)
 464                         if (!(c = cpu_set_malloc(&ncpus)))
 465                                 return -ENOMEM;
 466
 467                 if (r < 0 || cpu >= ncpus) {
 468                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 469                         CPU_FREE(c);
 470                         return -EBADMSG;
 471                 }
 472
 473                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 474         }
 475
 476         if (c) {
 477                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 478                         log_warning("Failed to set CPU affinity: %m");
 479
 480                 CPU_FREE(c);
 481         }
 482
 483         return 0;
 484 }
 485
 486 static int parse_config_file(void) {
 487
 488         const ConfigItem items[] = {
 489                 { "LogLevel",    config_parse_level,        NULL,               "Manager" },
 490                 { "LogTarget",   config_parse_target,       NULL,               "Manager" },
 491                 { "LogColor",    config_parse_color,        NULL,               "Manager" },
 492                 { "LogLocation", config_parse_location,     NULL,               "Manager" },
 493                 { "DumpCore",    config_parse_bool,         &arg_dump_core,     "Manager" },
 494                 { "CrashShell",  config_parse_bool,         &arg_crash_shell,   "Manager" },
 495                 { "ShowStatus",  config_parse_bool,         &arg_show_status,   "Manager" },
 496 #ifdef HAVE_SYSV_COMPAT
 497                 { "SysVConsole", config_parse_bool,         &arg_sysv_console,  "Manager" },
 498 #endif
 499                 { "CrashChVT",   config_parse_int,          &arg_crash_chvt,    "Manager" },
 500                 { "CPUAffinity", config_parse_cpu_affinity, NULL,               "Manager" },
 501                 { "MountAuto",   config_parse_bool,         &arg_mount_auto,    "Manager" },
 502                 { "SwapAuto",    config_parse_bool,         &arg_swap_auto,     "Manager" },
 503                 { NULL, NULL, NULL, NULL }
 504         };
 505
 506         static const char * const sections[] = {
 507                 "Manager",
 508                 NULL
 509         };
 510
 511         FILE *f;
 512         const char *fn;
 513         int r;
 514
 515         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
 516
 517         if (!(f = fopen(fn, "re"))) {
 518                 if (errno == ENOENT)
 519                         return 0;
 520
 521                 log_warning("Failed to open configuration file '%s': %m", fn);
 522                 return 0;
 523         }
 524
 525         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 526                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 527
 528         fclose(f);
 529
 530         return 0;
 531 }
 532
 533 static int parse_proc_cmdline(void) {
 534         char *line, *w, *state;
 535         int r;
 536         size_t l;
 537
 538         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 539                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 540                 return 0;
 541         }
 542
 543         FOREACH_WORD_QUOTED(w, l, line, state) {
 544                 char *word;
 545
 546                 if (!(word = strndup(w, l))) {
 547                         r = -ENOMEM;
 548                         goto finish;
 549                 }
 550
 551                 r = parse_proc_cmdline_word(word);
 552                 free(word);
 553
 554                 if (r < 0)
 555                         goto finish;
 556         }
 557
 558         r = 0;
 559
 560 finish:
 561         free(line);
 562         return r;
 563 }
 564
 565 static int parse_argv(int argc, char *argv[]) {
 566
 567         enum {
 568                 ARG_LOG_LEVEL = 0x100,
 569                 ARG_LOG_TARGET,
 570                 ARG_LOG_COLOR,
 571                 ARG_LOG_LOCATION,
 572                 ARG_UNIT,
 573                 ARG_SYSTEM,
 574                 ARG_SESSION,
 575                 ARG_TEST,
 576                 ARG_DUMP_CONFIGURATION_ITEMS,
 577                 ARG_DUMP_CORE,
 578                 ARG_CRASH_SHELL,
 579                 ARG_CONFIRM_SPAWN,
 580                 ARG_SHOW_STATUS,
 581                 ARG_SYSV_CONSOLE,
 582                 ARG_DESERIALIZE,
 583                 ARG_INTROSPECT
 584         };
 585
 586         static const struct option options[] = {
 587                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 588                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 589                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 590                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 591                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 592                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 593                 { "session",                  no_argument,       NULL, ARG_SESSION                  },
 594                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 595                 { "help",                     no_argument,       NULL, 'h'                          },
 596                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 597                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 598                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 599                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 600                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 601 #ifdef HAVE_SYSV_COMPAT
 602                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 603 #endif
 604                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 605                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 606                 { NULL,                       0,                 NULL, 0                            }
 607         };
 608
 609         int c, r;
 610
 611         assert(argc >= 1);
 612         assert(argv);
 613
 614         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 615
 616                 switch (c) {
 617
 618                 case ARG_LOG_LEVEL:
 619                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 620                                 log_error("Failed to parse log level %s.", optarg);
 621                                 return r;
 622                         }
 623
 624                         break;
 625
 626                 case ARG_LOG_TARGET:
 627
 628                         if ((r = log_set_target_from_string(optarg)) < 0) {
 629                                 log_error("Failed to parse log target %s.", optarg);
 630                                 return r;
 631                         }
 632
 633                         break;
 634
 635                 case ARG_LOG_COLOR:
 636
 637                         if (optarg) {
 638                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 639                                         log_error("Failed to parse log color setting %s.", optarg);
 640                                         return r;
 641                                 }
 642                         } else
 643                                 log_show_color(true);
 644
 645                         break;
 646
 647                 case ARG_LOG_LOCATION:
 648
 649                         if (optarg) {
 650                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 651                                         log_error("Failed to parse log location setting %s.", optarg);
 652                                         return r;
 653                                 }
 654                         } else
 655                                 log_show_location(true);
 656
 657                         break;
 658
 659                 case ARG_UNIT:
 660
 661                         if ((r = set_default_unit(optarg)) < 0) {
 662                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 663                                 return r;
 664                         }
 665
 666                         break;
 667
 668                 case ARG_SYSTEM:
 669                         arg_running_as = MANAGER_SYSTEM;
 670                         break;
 671
 672                 case ARG_SESSION:
 673                         arg_running_as = MANAGER_SESSION;
 674                         break;
 675
 676                 case ARG_TEST:
 677                         arg_action = ACTION_TEST;
 678                         break;
 679
 680                 case ARG_DUMP_CONFIGURATION_ITEMS:
 681                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 682                         break;
 683
 684                 case ARG_DUMP_CORE:
 685                         arg_dump_core = true;
 686                         break;
 687
 688                 case ARG_CRASH_SHELL:
 689                         arg_crash_shell = true;
 690                         break;
 691
 692                 case ARG_CONFIRM_SPAWN:
 693                         arg_confirm_spawn = true;
 694                         break;
 695
 696                 case ARG_SHOW_STATUS:
 697
 698                         if (optarg) {
 699                                 if ((r = parse_boolean(optarg)) < 0) {
 700                                         log_error("Failed to show status boolean %s.", optarg);
 701                                         return r;
 702                                 }
 703                                 arg_show_status = r;
 704                         } else
 705                                 arg_show_status = true;
 706                         break;
 707 #ifdef HAVE_SYSV_COMPAT
 708                 case ARG_SYSV_CONSOLE:
 709
 710                         if (optarg) {
 711                                 if ((r = parse_boolean(optarg)) < 0) {
 712                                         log_error("Failed to SysV console boolean %s.", optarg);
 713                                         return r;
 714                                 }
 715                                 arg_sysv_console = r;
 716                         } else
 717                                 arg_sysv_console = true;
 718                         break;
 719 #endif
 720
 721                 case ARG_DESERIALIZE: {
 722                         int fd;
 723                         FILE *f;
 724
 725                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 726                                 log_error("Failed to parse deserialize option %s.", optarg);
 727                                 return r;
 728                         }
 729
 730                         if (!(f = fdopen(fd, "r"))) {
 731                                 log_error("Failed to open serialization fd: %m");
 732                                 return r;
 733                         }
 734
 735                         if (serialization)
 736                                 fclose(serialization);
 737
 738                         serialization = f;
 739
 740                         break;
 741                 }
 742
 743                 case ARG_INTROSPECT: {
 744                         const char * const * i = NULL;
 745
 746                         for (i = bus_interface_table; *i; i += 2)
 747                                 if (!optarg || streq(i[0], optarg)) {
 748                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 749                                               "<node>\n", stdout);
 750                                         fputs(i[1], stdout);
 751                                         fputs("</node>\n", stdout);
 752
 753                                         if (optarg)
 754                                                 break;
 755                                 }
 756
 757                         if (!i[0] && optarg)
 758                                 log_error("Unknown interface %s.", optarg);
 759
 760                         arg_action = ACTION_DONE;
 761                         break;
 762                 }
 763
 764                 case 'h':
 765                         arg_action = ACTION_HELP;
 766                         break;
 767
 768                 case 'D':
 769                         log_set_max_level(LOG_DEBUG);
 770                         break;
 771
 772                 case '?':
 773                         return -EINVAL;
 774
 775                 default:
 776                         log_error("Unknown option code %c", c);
 777                         return -EINVAL;
 778                 }
 779
 780         /* PID 1 will get the kernel arguments as parameters, which we
 781          * ignore and unconditionally read from
 782          * /proc/cmdline. However, we need to ignore those arguments
 783          * here. */
 784         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 785                 log_error("Excess arguments.");
 786                 return -EINVAL;
 787         }
 788
 789         return 0;
 790 }
 791
 792 static int help(void) {
 793
 794         printf("%s [OPTIONS...]\n\n"
 795                "Starts up and maintains the system or a session.\n\n"
 796                "  -h --help                      Show this help\n"
 797                "     --test                      Determine startup sequence, dump it and exit\n"
 798                "     --dump-configuration-items  Dump understood unit configuration items\n"
 799                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 800                "     --unit=UNIT                 Set default unit\n"
 801                "     --system                    Run a system instance, even if PID != 1\n"
 802                "     --session                   Run a session instance\n"
 803                "     --dump-core                 Dump core on crash\n"
 804                "     --crash-shell               Run shell on crash\n"
 805                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 806                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 807 #ifdef HAVE_SYSV_COMPAT
 808                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 809 #endif
 810                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 811                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 812                "     --log-color[=0|1]           Highlight important log messages\n"
 813                "     --log-location[=0|1]        Include code location in log messages\n",
 814                program_invocation_short_name);
 815
 816         return 0;
 817 }
 818
 819 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 820         FILE *f = NULL;
 821         FDSet *fds = NULL;
 822         int r;
 823
 824         assert(m);
 825         assert(_f);
 826         assert(_fds);
 827
 828         if ((r = manager_open_serialization(m, &f)) < 0) {
 829                 log_error("Failed to create serialization faile: %s", strerror(-r));
 830                 goto fail;
 831         }
 832
 833         if (!(fds = fdset_new())) {
 834                 r = -ENOMEM;
 835                 log_error("Failed to allocate fd set: %s", strerror(-r));
 836                 goto fail;
 837         }
 838
 839         if ((r = manager_serialize(m, f, fds)) < 0) {
 840                 log_error("Failed to serialize state: %s", strerror(-r));
 841                 goto fail;
 842         }
 843
 844         if (fseeko(f, 0, SEEK_SET) < 0) {
 845                 log_error("Failed to rewind serialization fd: %m");
 846                 goto fail;
 847         }
 848
 849         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 850                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 851                 goto fail;
 852         }
 853
 854         if ((r = fdset_cloexec(fds, false)) < 0) {
 855                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 856                 goto fail;
 857         }
 858
 859         *_f = f;
 860         *_fds = fds;
 861
 862         return 0;
 863
 864 fail:
 865         fdset_free(fds);
 866
 867         if (f)
 868                 fclose(f);
 869
 870         return r;
 871 }
 872
 873 int main(int argc, char *argv[]) {
 874         Manager *m = NULL;
 875         int r, retval = EXIT_FAILURE;
 876         FDSet *fds = NULL;
 877         bool reexecute = false;
 878         const char *shutdown_verb = NULL;
 879
 880         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 881                 /* This is compatbility support for SysV, where
 882                  * calling init as a user is identical to telinit. */
 883
 884                 errno = -ENOENT;
 885                 execv(SYSTEMCTL_BINARY_PATH, argv);
 886                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 887                 return 1;
 888         }
 889
 890         log_show_color(isatty(STDERR_FILENO) > 0);
 891         log_show_location(false);
 892         log_set_max_level(LOG_INFO);
 893
 894         if (getpid() == 1) {
 895                 arg_running_as = MANAGER_SYSTEM;
 896                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 897
 898                 if (label_init() < 0)
 899                         goto finish;
 900         } else {
 901                 arg_running_as = MANAGER_SESSION;
 902                 log_set_target(LOG_TARGET_CONSOLE);
 903         }
 904
 905         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 906                 goto finish;
 907
 908         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 909          * /proc/$PID/fd is available. */
 910         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 911                 if (mount_setup() < 0)
 912                         goto finish;
 913
 914         /* Reset all signal handlers. */
 915         assert_se(reset_all_signal_handlers() == 0);
 916
 917         /* If we are init, we can block sigkill. Yay. */
 918         ignore_signals(SIGNALS_IGNORE, -1);
 919
 920         if (parse_config_file() < 0)
 921                 goto finish;
 922
 923         if (arg_running_as == MANAGER_SYSTEM)
 924                 if (parse_proc_cmdline() < 0)
 925                         goto finish;
 926
 927         log_parse_environment();
 928
 929         if (parse_argv(argc, argv) < 0)
 930                 goto finish;
 931
 932         if (arg_action == ACTION_HELP) {
 933                 retval = help();
 934                 goto finish;
 935         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 936                 unit_dump_config_items(stdout);
 937                 retval = EXIT_SUCCESS;
 938                 goto finish;
 939         } else if (arg_action == ACTION_DONE) {
 940                 retval = EXIT_SUCCESS;
 941                 goto finish;
 942         }
 943
 944         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 945
 946         /* Remember open file descriptors for later deserialization */
 947         if (serialization) {
 948                 if ((r = fdset_new_fill(&fds)) < 0) {
 949                         log_error("Failed to allocate fd set: %s", strerror(-r));
 950                         goto finish;
 951                 }
 952
 953                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 954         } else
 955                 close_all_fds(NULL, 0);
 956
 957         /* Set up PATH unless it is already set */
 958         setenv("PATH",
 959                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 960                arg_running_as == MANAGER_SYSTEM);
 961
 962         /* Unset some environment variables passed in from the kernel
 963          * that don't really make sense for us. */
 964         if (arg_running_as == MANAGER_SYSTEM) {
 965                 unsetenv("HOME");
 966                 unsetenv("TERM");
 967         }
 968
 969         /* Move out of the way, so that we won't block unmounts */
 970         assert_se(chdir("/")  == 0);
 971
 972         if (arg_running_as == MANAGER_SYSTEM) {
 973                 /* Become a session leader if we aren't one yet. */
 974                 setsid();
 975
 976                 /* Disable the umask logic */
 977                 umask(0);
 978         }
 979
 980         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 981         dbus_connection_set_change_sigpipe(FALSE);
 982
 983         /* Reset the console, but only if this is really init and we
 984          * are freshly booted */
 985         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 986                 console_setup(getpid() == 1 && !serialization);
 987                 make_null_stdio();
 988         }
 989
 990         /* Open the logging devices, if possible and necessary */
 991         log_open();
 992
 993         /* Make sure we leave a core dump without panicing the
 994          * kernel. */
 995         if (getpid() == 1)
 996                 install_crash_handler();
 997
 998         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
 999                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1000
1001         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1002                 locale_setup();
1003
1004                 if (arg_show_status)
1005                         status_welcome();
1006
1007                 kmod_setup();
1008                 hostname_setup();
1009                 loopback_setup();
1010
1011                 mkdir_p("/dev/.systemd/ask-password/", 0755);
1012         }
1013
1014         if ((r = manager_new(arg_running_as, &m)) < 0) {
1015                 log_error("Failed to allocate manager object: %s", strerror(-r));
1016                 goto finish;
1017         }
1018
1019         m->confirm_spawn = arg_confirm_spawn;
1020         m->show_status = arg_show_status;
1021 #ifdef HAVE_SYSV_COMPAT
1022         m->sysv_console = arg_sysv_console;
1023 #endif
1024         m->mount_auto = arg_mount_auto;
1025         m->swap_auto = arg_swap_auto;
1026
1027         if (arg_console)
1028                 manager_set_console(m, arg_console);
1029
1030         if ((r = manager_startup(m, serialization, fds)) < 0)
1031                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1032
1033         if (fds) {
1034                 /* This will close all file descriptors that were opened, but
1035                  * not claimed by any unit. */
1036
1037                 fdset_free(fds);
1038                 fds = NULL;
1039         }
1040
1041         if (serialization) {
1042                 fclose(serialization);
1043                 serialization = NULL;
1044         } else {
1045                 DBusError error;
1046                 Unit *target = NULL;
1047
1048                 dbus_error_init(&error);
1049
1050                 log_debug("Activating default unit: %s", arg_default_unit);
1051
1052                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1053                         log_error("Failed to load default target: %s", bus_error(&error, r));
1054                         dbus_error_free(&error);
1055                 } else if (target->meta.load_state == UNIT_ERROR)
1056                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1057                 else if (target->meta.load_state == UNIT_MASKED)
1058                         log_error("Default target masked.");
1059
1060                 if (!target || target->meta.load_state != UNIT_LOADED) {
1061                         log_info("Trying to load rescue target...");
1062
1063                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1064                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1065                                 dbus_error_free(&error);
1066                                 goto finish;
1067                         } else if (target->meta.load_state == UNIT_ERROR) {
1068                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1069                                 goto finish;
1070                         } else if (target->meta.load_state == UNIT_MASKED) {
1071                                 log_error("Rescue target masked.");
1072                                 goto finish;
1073                         }
1074                 }
1075
1076                 assert(target->meta.load_state == UNIT_LOADED);
1077
1078                 if (arg_action == ACTION_TEST) {
1079                         printf("-> By units:\n");
1080                         manager_dump_units(m, stdout, "\t");
1081                 }
1082
1083                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1084                         log_error("Failed to start default target: %s", bus_error(&error, r));
1085                         dbus_error_free(&error);
1086                         goto finish;
1087                 }
1088
1089                 if (arg_action == ACTION_TEST) {
1090                         printf("-> By jobs:\n");
1091                         manager_dump_jobs(m, stdout, "\t");
1092                         retval = EXIT_SUCCESS;
1093                         goto finish;
1094                 }
1095         }
1096
1097         for (;;) {
1098                 if ((r = manager_loop(m)) < 0) {
1099                         log_error("Failed to run mainloop: %s", strerror(-r));
1100                         goto finish;
1101                 }
1102
1103                 switch (m->exit_code) {
1104
1105                 case MANAGER_EXIT:
1106                         retval = EXIT_SUCCESS;
1107                         log_debug("Exit.");
1108                         goto finish;
1109
1110                 case MANAGER_RELOAD:
1111                         log_info("Reloading.");
1112                         if ((r = manager_reload(m)) < 0)
1113                                 log_error("Failed to reload: %s", strerror(-r));
1114                         break;
1115
1116                 case MANAGER_REEXECUTE:
1117                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1118                                 goto finish;
1119
1120                         reexecute = true;
1121                         log_notice("Reexecuting.");
1122                         goto finish;
1123
1124                 case MANAGER_REBOOT:
1125                 case MANAGER_POWEROFF:
1126                 case MANAGER_HALT:
1127                 case MANAGER_KEXEC: {
1128                         static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1129                                 [MANAGER_REBOOT] = "reboot",
1130                                 [MANAGER_POWEROFF] = "poweroff",
1131                                 [MANAGER_HALT] = "halt",
1132                                 [MANAGER_KEXEC] = "kexec"
1133                         };
1134
1135                         assert_se(shutdown_verb = table[m->exit_code]);
1136
1137                         log_notice("Shutting down.");
1138                         goto finish;
1139                 }
1140
1141                 default:
1142                         assert_not_reached("Unknown exit code.");
1143                 }
1144         }
1145
1146 finish:
1147         if (m)
1148                 manager_free(m);
1149
1150         free(arg_default_unit);
1151         free(arg_console);
1152
1153         dbus_shutdown();
1154
1155         label_finish();
1156
1157         if (reexecute) {
1158                 const char *args[15];
1159                 unsigned i = 0;
1160                 char sfd[16];
1161
1162                 assert(serialization);
1163                 assert(fds);
1164
1165                 args[i++] = SYSTEMD_BINARY_PATH;
1166
1167                 args[i++] = "--log-level";
1168                 args[i++] = log_level_to_string(log_get_max_level());
1169
1170                 args[i++] = "--log-target";
1171                 args[i++] = log_target_to_string(log_get_target());
1172
1173                 if (arg_running_as == MANAGER_SYSTEM)
1174                         args[i++] = "--system";
1175                 else
1176                         args[i++] = "--session";
1177
1178                 if (arg_dump_core)
1179                         args[i++] = "--dump-core";
1180
1181                 if (arg_crash_shell)
1182                         args[i++] = "--crash-shell";
1183
1184                 if (arg_confirm_spawn)
1185                         args[i++] = "--confirm-spawn";
1186
1187                 if (arg_show_status)
1188                         args[i++] = "--show-status=1";
1189                 else
1190                         args[i++] = "--show-status=0";
1191
1192 #ifdef HAVE_SYSV_COMPAT
1193                 if (arg_sysv_console)
1194                         args[i++] = "--sysv-console=1";
1195                 else
1196                         args[i++] = "--sysv-console=0";
1197 #endif
1198
1199                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1200                 char_array_0(sfd);
1201
1202                 args[i++] = "--deserialize";
1203                 args[i++] = sfd;
1204
1205                 args[i++] = NULL;
1206
1207                 assert(i <= ELEMENTSOF(args));
1208
1209                 execv(args[0], (char* const*) args);
1210
1211                 log_error("Failed to reexecute: %m");
1212         }
1213
1214         if (serialization)
1215                 fclose(serialization);
1216
1217         if (fds)
1218                 fdset_free(fds);
1219
1220         if (shutdown_verb) {
1221                 const char * command_line[] = {
1222                         SYSTEMD_SHUTDOWN_BINARY_PATH,
1223                         shutdown_verb,
1224                         NULL
1225                 };
1226
1227                 execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line);
1228                 log_error("Failed to execute shutdown binary, freezing: %m");
1229         }
1230
1231         if (getpid() == 1)
1232                 freeze();
1233
1234         return retval;
1235 }