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 static ExecOutput arg_default_std_output = EXEC_OUTPUT_INHERIT;
  77 static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT;
  78
  79 static FILE* serialization = NULL;
  80
  81 static void nop_handler(int sig) {
  82 }
  83
  84 _noreturn_ static void crash(int sig) {
  85
  86         if (!arg_dump_core)
  87                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  88         else {
  89                 struct sigaction sa;
  90                 pid_t pid;
  91
  92                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  93                 zero(sa);
  94                 sa.sa_handler = nop_handler;
  95                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  96                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  97
  98                 if ((pid = fork()) < 0)
  99                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
 100
 101                 else if (pid == 0) {
 102                         struct rlimit rl;
 103
 104                         /* Enable default signal handler for core dump */
 105                         zero(sa);
 106                         sa.sa_handler = SIG_DFL;
 107                         assert_se(sigaction(sig, &sa, NULL) == 0);
 108
 109                         /* Don't limit the core dump size */
 110                         zero(rl);
 111                         rl.rlim_cur = RLIM_INFINITY;
 112                         rl.rlim_max = RLIM_INFINITY;
 113                         setrlimit(RLIMIT_CORE, &rl);
 114
 115                         /* Just to be sure... */
 116                         assert_se(chdir("/") == 0);
 117
 118                         /* Raise the signal again */
 119                         raise(sig);
 120
 121                         assert_not_reached("We shouldn't be here...");
 122                         _exit(1);
 123
 124                 } else {
 125                         siginfo_t status;
 126                         int r;
 127
 128                         /* Order things nicely. */
 129                         if ((r = wait_for_terminate(pid, &status)) < 0)
 130                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
 131                         else if (status.si_code != CLD_DUMPED)
 132                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 133                         else
 134                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 135                 }
 136         }
 137
 138         if (arg_crash_chvt)
 139                 chvt(arg_crash_chvt);
 140
 141         if (arg_crash_shell) {
 142                 struct sigaction sa;
 143                 pid_t pid;
 144
 145                 log_info("Executing crash shell in 10s...");
 146                 sleep(10);
 147
 148                 /* Let the kernel reap children for us */
 149                 zero(sa);
 150                 sa.sa_handler = SIG_IGN;
 151                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 152                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 153
 154                 if ((pid = fork()) < 0)
 155                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 156                 else if (pid == 0) {
 157                         int fd, r;
 158
 159                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 160                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 161                         else if ((r = make_stdio(fd)) < 0)
 162                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 163
 164                         execl("/bin/sh", "/bin/sh", NULL);
 165
 166                         log_error("execl() failed: %s", strerror(errno));
 167                         _exit(1);
 168                 }
 169
 170                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 171         }
 172
 173         log_info("Freezing execution.");
 174         freeze();
 175 }
 176
 177 static void install_crash_handler(void) {
 178         struct sigaction sa;
 179
 180         zero(sa);
 181
 182         sa.sa_handler = crash;
 183         sa.sa_flags = SA_NODEFER;
 184
 185         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 186 }
 187
 188 static int console_setup(bool do_reset) {
 189         int tty_fd, r;
 190
 191         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 192          * and make sure we don't have a controlling tty. */
 193
 194         release_terminal();
 195
 196         if (!do_reset)
 197                 return 0;
 198
 199         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 200                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 201                 return -tty_fd;
 202         }
 203
 204         if ((r = reset_terminal(tty_fd)) < 0)
 205                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 206
 207         close_nointr_nofail(tty_fd);
 208         return r;
 209 }
 210
 211 static int set_default_unit(const char *u) {
 212         char *c;
 213
 214         assert(u);
 215
 216         if (!(c = strdup(u)))
 217                 return -ENOMEM;
 218
 219         free(arg_default_unit);
 220         arg_default_unit = c;
 221         return 0;
 222 }
 223
 224 static int parse_proc_cmdline_word(const char *word) {
 225
 226         static const char * const rlmap[] = {
 227                 "emergency", SPECIAL_EMERGENCY_TARGET,
 228                 "single",    SPECIAL_RESCUE_TARGET,
 229                 "-s",        SPECIAL_RESCUE_TARGET,
 230                 "s",         SPECIAL_RESCUE_TARGET,
 231                 "S",         SPECIAL_RESCUE_TARGET,
 232                 "1",         SPECIAL_RESCUE_TARGET,
 233                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 234                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 235                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 236                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 237         };
 238
 239         assert(word);
 240
 241         if (startswith(word, "systemd.unit="))
 242                 return set_default_unit(word + 13);
 243
 244         else if (startswith(word, "systemd.log_target=")) {
 245
 246                 if (log_set_target_from_string(word + 19) < 0)
 247                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 248
 249         } else if (startswith(word, "systemd.log_level=")) {
 250
 251                 if (log_set_max_level_from_string(word + 18) < 0)
 252                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 253
 254         } else if (startswith(word, "systemd.log_color=")) {
 255
 256                 if (log_show_color_from_string(word + 18) < 0)
 257                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 258
 259         } else if (startswith(word, "systemd.log_location=")) {
 260
 261                 if (log_show_location_from_string(word + 21) < 0)
 262                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 263
 264         } else if (startswith(word, "systemd.dump_core=")) {
 265                 int r;
 266
 267                 if ((r = parse_boolean(word + 18)) < 0)
 268                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 269                 else
 270                         arg_dump_core = r;
 271
 272         } else if (startswith(word, "systemd.crash_shell=")) {
 273                 int r;
 274
 275                 if ((r = parse_boolean(word + 20)) < 0)
 276                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 277                 else
 278                         arg_crash_shell = r;
 279
 280         } else if (startswith(word, "systemd.confirm_spawn=")) {
 281                 int r;
 282
 283                 if ((r = parse_boolean(word + 22)) < 0)
 284                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 285                 else
 286                         arg_confirm_spawn = r;
 287
 288         } else if (startswith(word, "systemd.crash_chvt=")) {
 289                 int k;
 290
 291                 if (safe_atoi(word + 19, &k) < 0)
 292                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 293                 else
 294                         arg_crash_chvt = k;
 295
 296         } else if (startswith(word, "systemd.show_status=")) {
 297                 int r;
 298
 299                 if ((r = parse_boolean(word + 20)) < 0)
 300                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 301                 else
 302                         arg_show_status = r;
 303         } else if (startswith(word, "systemd.default_standard_output=")) {
 304                 int r;
 305
 306                 if ((r = exec_output_from_string(word + 32)) < 0)
 307                         log_warning("Failed to parse default standard output switch %s, Ignoring.", word + 32);
 308                 else
 309                         arg_default_std_output = r;
 310         } else if (startswith(word, "systemd.default_standard_error=")) {
 311                 int r;
 312
 313                 if ((r = exec_output_from_string(word + 31)) < 0)
 314                         log_warning("Failed to parse default standard error switch %s, Ignoring.", word + 31);
 315                 else
 316                         arg_default_std_error = r;
 317 #ifdef HAVE_SYSV_COMPAT
 318         } else if (startswith(word, "systemd.sysv_console=")) {
 319                 int r;
 320
 321                 if ((r = parse_boolean(word + 21)) < 0)
 322                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 323                 else
 324                         arg_sysv_console = r;
 325 #endif
 326
 327         } else if (startswith(word, "systemd.")) {
 328
 329                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 330
 331                 log_info("Supported kernel switches:\n"
 332                          "systemd.unit=UNIT                        Default unit to start\n"
 333                          "systemd.dump_core=0|1                    Dump core on crash\n"
 334                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 335                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 336                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 337                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 338 #ifdef HAVE_SYSV_COMPAT
 339                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 340 #endif
 341                          "systemd.log_target=console|kmsg|syslog|syslog-or-kmsg|null\n"
 342                          "                                         Log target\n"
 343                          "systemd.log_level=LEVEL                  Log level\n"
 344                          "systemd.log_color=0|1                    Highlight important log messages\n"
 345                          "systemd.log_location=0|1                 Include code location in log messages\n"
 346                          "systemd.default_standard_output=null|tty|syslog|syslog+console|kmsg|kmsg+console\n"
 347                          "                                         Set default log output for services\n"
 348                          "systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console\n"
 349                          "                                         Set default log error output for services\n");
 350
 351         } else if (streq(word, "quiet")) {
 352                 arg_show_status = false;
 353 #ifdef HAVE_SYSV_COMPAT
 354                 arg_sysv_console = false;
 355 #endif
 356         } else {
 357                 unsigned i;
 358
 359                 /* SysV compatibility */
 360                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 361                         if (streq(word, rlmap[i]))
 362                                 return set_default_unit(rlmap[i+1]);
 363         }
 364
 365         return 0;
 366 }
 367
 368 static int config_parse_level(
 369                 const char *filename,
 370                 unsigned line,
 371                 const char *section,
 372                 const char *lvalue,
 373                 const char *rvalue,
 374                 void *data,
 375                 void *userdata) {
 376
 377         assert(filename);
 378         assert(lvalue);
 379         assert(rvalue);
 380
 381         log_set_max_level_from_string(rvalue);
 382         return 0;
 383 }
 384
 385 static int config_parse_target(
 386                 const char *filename,
 387                 unsigned line,
 388                 const char *section,
 389                 const char *lvalue,
 390                 const char *rvalue,
 391                 void *data,
 392                 void *userdata) {
 393
 394         assert(filename);
 395         assert(lvalue);
 396         assert(rvalue);
 397
 398         log_set_target_from_string(rvalue);
 399         return 0;
 400 }
 401
 402 static int config_parse_color(
 403                 const char *filename,
 404                 unsigned line,
 405                 const char *section,
 406                 const char *lvalue,
 407                 const char *rvalue,
 408                 void *data,
 409                 void *userdata) {
 410
 411         assert(filename);
 412         assert(lvalue);
 413         assert(rvalue);
 414
 415         log_show_color_from_string(rvalue);
 416         return 0;
 417 }
 418
 419 static int config_parse_location(
 420                 const char *filename,
 421                 unsigned line,
 422                 const char *section,
 423                 const char *lvalue,
 424                 const char *rvalue,
 425                 void *data,
 426                 void *userdata) {
 427
 428         assert(filename);
 429         assert(lvalue);
 430         assert(rvalue);
 431
 432         log_show_location_from_string(rvalue);
 433         return 0;
 434 }
 435
 436 static int config_parse_cpu_affinity(
 437                 const char *filename,
 438                 unsigned line,
 439                 const char *section,
 440                 const char *lvalue,
 441                 const char *rvalue,
 442                 void *data,
 443                 void *userdata) {
 444
 445         char *w;
 446         size_t l;
 447         char *state;
 448         cpu_set_t *c = NULL;
 449         unsigned ncpus = 0;
 450
 451         assert(filename);
 452         assert(lvalue);
 453         assert(rvalue);
 454
 455         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 456                 char *t;
 457                 int r;
 458                 unsigned cpu;
 459
 460                 if (!(t = strndup(w, l)))
 461                         return -ENOMEM;
 462
 463                 r = safe_atou(t, &cpu);
 464                 free(t);
 465
 466                 if (!c)
 467                         if (!(c = cpu_set_malloc(&ncpus)))
 468                                 return -ENOMEM;
 469
 470                 if (r < 0 || cpu >= ncpus) {
 471                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 472                         CPU_FREE(c);
 473                         return -EBADMSG;
 474                 }
 475
 476                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 477         }
 478
 479         if (c) {
 480                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 481                         log_warning("Failed to set CPU affinity: %m");
 482
 483                 CPU_FREE(c);
 484         }
 485
 486         return 0;
 487 }
 488
 489 static DEFINE_CONFIG_PARSE_ENUM(config_parse_output, exec_output, ExecOutput, "Failed to parse output specifier");
 490
 491 static int parse_config_file(void) {
 492
 493         const ConfigItem items[] = {
 494                 { "LogLevel",              config_parse_level,        NULL,                     "Manager" },
 495                 { "LogTarget",             config_parse_target,       NULL,                     "Manager" },
 496                 { "LogColor",              config_parse_color,        NULL,                     "Manager" },
 497                 { "LogLocation",           config_parse_location,     NULL,                     "Manager" },
 498                 { "DumpCore",              config_parse_bool,         &arg_dump_core,           "Manager" },
 499                 { "CrashShell",            config_parse_bool,         &arg_crash_shell,         "Manager" },
 500                 { "ShowStatus",            config_parse_bool,         &arg_show_status,         "Manager" },
 501 #ifdef HAVE_SYSV_COMPAT
 502                 { "SysVConsole",           config_parse_bool,         &arg_sysv_console,        "Manager" },
 503 #endif
 504                 { "CrashChVT",             config_parse_int,          &arg_crash_chvt,          "Manager" },
 505                 { "CPUAffinity",           config_parse_cpu_affinity, NULL,                     "Manager" },
 506                 { "MountAuto",             config_parse_bool,         &arg_mount_auto,          "Manager" },
 507                 { "SwapAuto",              config_parse_bool,         &arg_swap_auto,           "Manager" },
 508                 { "DefaultControllers",    config_parse_strv,         &arg_default_controllers, "Manager" },
 509                 { "DefaultStandardOutput", config_parse_output,       &arg_default_std_output,  "Manager" },
 510                 { "DefaultStandardError",  config_parse_output,       &arg_default_std_error,   "Manager" },
 511                 { NULL, NULL, NULL, NULL }
 512         };
 513
 514         static const char * const sections[] = {
 515                 "Manager",
 516                 NULL
 517         };
 518
 519         FILE *f;
 520         const char *fn;
 521         int r;
 522
 523         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE;
 524
 525         if (!(f = fopen(fn, "re"))) {
 526                 if (errno == ENOENT)
 527                         return 0;
 528
 529                 log_warning("Failed to open configuration file '%s': %m", fn);
 530                 return 0;
 531         }
 532
 533         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
 534                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 535
 536         fclose(f);
 537
 538         return 0;
 539 }
 540
 541 static int parse_proc_cmdline(void) {
 542         char *line, *w, *state;
 543         int r;
 544         size_t l;
 545
 546         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 547                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 548                 return 0;
 549         }
 550
 551         FOREACH_WORD_QUOTED(w, l, line, state) {
 552                 char *word;
 553
 554                 if (!(word = strndup(w, l))) {
 555                         r = -ENOMEM;
 556                         goto finish;
 557                 }
 558
 559                 r = parse_proc_cmdline_word(word);
 560                 free(word);
 561
 562                 if (r < 0)
 563                         goto finish;
 564         }
 565
 566         r = 0;
 567
 568 finish:
 569         free(line);
 570         return r;
 571 }
 572
 573 static int parse_argv(int argc, char *argv[]) {
 574
 575         enum {
 576                 ARG_LOG_LEVEL = 0x100,
 577                 ARG_LOG_TARGET,
 578                 ARG_LOG_COLOR,
 579                 ARG_LOG_LOCATION,
 580                 ARG_UNIT,
 581                 ARG_SYSTEM,
 582                 ARG_USER,
 583                 ARG_TEST,
 584                 ARG_DUMP_CONFIGURATION_ITEMS,
 585                 ARG_DUMP_CORE,
 586                 ARG_CRASH_SHELL,
 587                 ARG_CONFIRM_SPAWN,
 588                 ARG_SHOW_STATUS,
 589                 ARG_SYSV_CONSOLE,
 590                 ARG_DESERIALIZE,
 591                 ARG_INTROSPECT,
 592                 ARG_DEFAULT_STD_OUTPUT,
 593                 ARG_DEFAULT_STD_ERROR
 594         };
 595
 596         static const struct option options[] = {
 597                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 598                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 599                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 600                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 601                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 602                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 603                 { "user",                     no_argument,       NULL, ARG_USER                     },
 604                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 605                 { "help",                     no_argument,       NULL, 'h'                          },
 606                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 607                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 608                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 609                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 610                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 611 #ifdef HAVE_SYSV_COMPAT
 612                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 613 #endif
 614                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 615                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 616                 { "default-standard-output",  required_argument, NULL, ARG_DEFAULT_STD_OUTPUT,      },
 617                 { "default-standard-error",   required_argument, NULL, ARG_DEFAULT_STD_ERROR,       },
 618                 { NULL,                       0,                 NULL, 0                            }
 619         };
 620
 621         int c, r;
 622
 623         assert(argc >= 1);
 624         assert(argv);
 625
 626         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
 627
 628                 switch (c) {
 629
 630                 case ARG_LOG_LEVEL:
 631                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 632                                 log_error("Failed to parse log level %s.", optarg);
 633                                 return r;
 634                         }
 635
 636                         break;
 637
 638                 case ARG_LOG_TARGET:
 639
 640                         if ((r = log_set_target_from_string(optarg)) < 0) {
 641                                 log_error("Failed to parse log target %s.", optarg);
 642                                 return r;
 643                         }
 644
 645                         break;
 646
 647                 case ARG_LOG_COLOR:
 648
 649                         if (optarg) {
 650                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 651                                         log_error("Failed to parse log color setting %s.", optarg);
 652                                         return r;
 653                                 }
 654                         } else
 655                                 log_show_color(true);
 656
 657                         break;
 658
 659                 case ARG_LOG_LOCATION:
 660
 661                         if (optarg) {
 662                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 663                                         log_error("Failed to parse log location setting %s.", optarg);
 664                                         return r;
 665                                 }
 666                         } else
 667                                 log_show_location(true);
 668
 669                         break;
 670
 671                 case ARG_DEFAULT_STD_OUTPUT:
 672
 673                         if ((r = exec_output_from_string(optarg)) < 0) {
 674                                 log_error("Failed to parse default standard output setting %s.", optarg);
 675                                 return r;
 676                         } else
 677                                 arg_default_std_output = r;
 678                         break;
 679
 680                 case ARG_DEFAULT_STD_ERROR:
 681
 682                         if ((r = exec_output_from_string(optarg)) < 0) {
 683                                 log_error("Failed to parse default standard error output setting %s.", optarg);
 684                                 return r;
 685                         } else
 686                                 arg_default_std_error = r;
 687                         break;
 688
 689                 case ARG_UNIT:
 690
 691                         if ((r = set_default_unit(optarg)) < 0) {
 692                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 693                                 return r;
 694                         }
 695
 696                         break;
 697
 698                 case ARG_SYSTEM:
 699                         arg_running_as = MANAGER_SYSTEM;
 700                         break;
 701
 702                 case ARG_USER:
 703                         arg_running_as = MANAGER_USER;
 704                         break;
 705
 706                 case ARG_TEST:
 707                         arg_action = ACTION_TEST;
 708                         break;
 709
 710                 case ARG_DUMP_CONFIGURATION_ITEMS:
 711                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 712                         break;
 713
 714                 case ARG_DUMP_CORE:
 715                         arg_dump_core = true;
 716                         break;
 717
 718                 case ARG_CRASH_SHELL:
 719                         arg_crash_shell = true;
 720                         break;
 721
 722                 case ARG_CONFIRM_SPAWN:
 723                         arg_confirm_spawn = true;
 724                         break;
 725
 726                 case ARG_SHOW_STATUS:
 727
 728                         if (optarg) {
 729                                 if ((r = parse_boolean(optarg)) < 0) {
 730                                         log_error("Failed to show status boolean %s.", optarg);
 731                                         return r;
 732                                 }
 733                                 arg_show_status = r;
 734                         } else
 735                                 arg_show_status = true;
 736                         break;
 737 #ifdef HAVE_SYSV_COMPAT
 738                 case ARG_SYSV_CONSOLE:
 739
 740                         if (optarg) {
 741                                 if ((r = parse_boolean(optarg)) < 0) {
 742                                         log_error("Failed to SysV console boolean %s.", optarg);
 743                                         return r;
 744                                 }
 745                                 arg_sysv_console = r;
 746                         } else
 747                                 arg_sysv_console = true;
 748                         break;
 749 #endif
 750
 751                 case ARG_DESERIALIZE: {
 752                         int fd;
 753                         FILE *f;
 754
 755                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 756                                 log_error("Failed to parse deserialize option %s.", optarg);
 757                                 return r;
 758                         }
 759
 760                         if (!(f = fdopen(fd, "r"))) {
 761                                 log_error("Failed to open serialization fd: %m");
 762                                 return r;
 763                         }
 764
 765                         if (serialization)
 766                                 fclose(serialization);
 767
 768                         serialization = f;
 769
 770                         break;
 771                 }
 772
 773                 case ARG_INTROSPECT: {
 774                         const char * const * i = NULL;
 775
 776                         for (i = bus_interface_table; *i; i += 2)
 777                                 if (!optarg || streq(i[0], optarg)) {
 778                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 779                                               "<node>\n", stdout);
 780                                         fputs(i[1], stdout);
 781                                         fputs("</node>\n", stdout);
 782
 783                                         if (optarg)
 784                                                 break;
 785                                 }
 786
 787                         if (!i[0] && optarg)
 788                                 log_error("Unknown interface %s.", optarg);
 789
 790                         arg_action = ACTION_DONE;
 791                         break;
 792                 }
 793
 794                 case 'h':
 795                         arg_action = ACTION_HELP;
 796                         break;
 797
 798                 case 'D':
 799                         log_set_max_level(LOG_DEBUG);
 800                         break;
 801
 802                 case '?':
 803                         return -EINVAL;
 804
 805                 default:
 806                         log_error("Unknown option code %c", c);
 807                         return -EINVAL;
 808                 }
 809
 810         /* PID 1 will get the kernel arguments as parameters, which we
 811          * ignore and unconditionally read from
 812          * /proc/cmdline. However, we need to ignore those arguments
 813          * here. */
 814         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 815                 log_error("Excess arguments.");
 816                 return -EINVAL;
 817         }
 818
 819         return 0;
 820 }
 821
 822 static int help(void) {
 823
 824         printf("%s [OPTIONS...]\n\n"
 825                "Starts up and maintains the system or user services.\n\n"
 826                "  -h --help                      Show this help\n"
 827                "     --test                      Determine startup sequence, dump it and exit\n"
 828                "     --dump-configuration-items  Dump understood unit configuration items\n"
 829                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 830                "     --unit=UNIT                 Set default unit\n"
 831                "     --system                    Run a system instance, even if PID != 1\n"
 832                "     --user                      Run a user instance\n"
 833                "     --dump-core                 Dump core on crash\n"
 834                "     --crash-shell               Run shell on crash\n"
 835                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 836                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 837 #ifdef HAVE_SYSV_COMPAT
 838                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 839 #endif
 840                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 841                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 842                "     --log-color[=0|1]           Highlight important log messages\n"
 843                "     --log-location[=0|1]        Include code location in log messages\n"
 844                "     --default-standard-output=  Set default standard output for services\n"
 845                "     --default-standard-error=   Set default standard error output for services\n",
 846                program_invocation_short_name);
 847
 848         return 0;
 849 }
 850
 851 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 852         FILE *f = NULL;
 853         FDSet *fds = NULL;
 854         int r;
 855
 856         assert(m);
 857         assert(_f);
 858         assert(_fds);
 859
 860         if ((r = manager_open_serialization(m, &f)) < 0) {
 861                 log_error("Failed to create serialization faile: %s", strerror(-r));
 862                 goto fail;
 863         }
 864
 865         if (!(fds = fdset_new())) {
 866                 r = -ENOMEM;
 867                 log_error("Failed to allocate fd set: %s", strerror(-r));
 868                 goto fail;
 869         }
 870
 871         if ((r = manager_serialize(m, f, fds)) < 0) {
 872                 log_error("Failed to serialize state: %s", strerror(-r));
 873                 goto fail;
 874         }
 875
 876         if (fseeko(f, 0, SEEK_SET) < 0) {
 877                 log_error("Failed to rewind serialization fd: %m");
 878                 goto fail;
 879         }
 880
 881         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 882                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 883                 goto fail;
 884         }
 885
 886         if ((r = fdset_cloexec(fds, false)) < 0) {
 887                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 888                 goto fail;
 889         }
 890
 891         *_f = f;
 892         *_fds = fds;
 893
 894         return 0;
 895
 896 fail:
 897         fdset_free(fds);
 898
 899         if (f)
 900                 fclose(f);
 901
 902         return r;
 903 }
 904
 905 static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
 906         const char *e;
 907         unsigned long long a, b;
 908
 909         assert(t);
 910
 911         if (!(e = getenv("RD_TIMESTAMP")))
 912                 return NULL;
 913
 914         if (sscanf(e, "%llu %llu", &a, &b) != 2)
 915                 return NULL;
 916
 917         t->realtime = (usec_t) a;
 918         t->monotonic = (usec_t) b;
 919
 920         return t;
 921 }
 922
 923 static void test_mtab(void) {
 924         char *p;
 925
 926         if (readlink_malloc("/etc/mtab", &p) >= 0) {
 927                 bool b;
 928
 929                 b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");
 930                 free(p);
 931
 932                 if (b)
 933                         return;
 934         }
 935
 936         log_error("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
 937                   "This is not supported anymore. "
 938                   "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
 939 }
 940
 941 int main(int argc, char *argv[]) {
 942         Manager *m = NULL;
 943         int r, retval = EXIT_FAILURE;
 944         FDSet *fds = NULL;
 945         bool reexecute = false;
 946         const char *shutdown_verb = NULL;
 947         dual_timestamp initrd_timestamp = { 0ULL, 0ULL };
 948         char systemd[] = "systemd";
 949
 950         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 951                 /* This is compatbility support for SysV, where
 952                  * calling init as a user is identical to telinit. */
 953
 954                 errno = -ENOENT;
 955                 execv(SYSTEMCTL_BINARY_PATH, argv);
 956                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 957                 return 1;
 958         }
 959
 960         /* If we get started via the /sbin/init symlink then we are
 961            called 'init'. After a subsequent reexecution we are then
 962            called 'systemd'. That is confusing, hence let's call us
 963            systemd right-away. */
 964
 965         program_invocation_short_name = systemd;
 966         prctl(PR_SET_NAME, systemd);
 967
 968         log_show_color(isatty(STDERR_FILENO) > 0);
 969         log_show_location(false);
 970         log_set_max_level(LOG_INFO);
 971
 972         if (getpid() == 1) {
 973                 arg_running_as = MANAGER_SYSTEM;
 974                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 975
 976                 /* This might actually not return, but cause a
 977                  * reexecution */
 978                 if (selinux_setup(argv) < 0)
 979                         goto finish;
 980
 981                 if (label_init() < 0)
 982                         goto finish;
 983         } else {
 984                 arg_running_as = MANAGER_USER;
 985                 log_set_target(LOG_TARGET_CONSOLE);
 986         }
 987
 988         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 989                 goto finish;
 990
 991         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 992          * /proc/$PID/fd is available. */
 993         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
 994                 if (mount_setup() < 0)
 995                         goto finish;
 996
 997         /* Reset all signal handlers. */
 998         assert_se(reset_all_signal_handlers() == 0);
 999
1000         /* If we are init, we can block sigkill. Yay. */
1001         ignore_signals(SIGNALS_IGNORE, -1);
1002
1003         if (parse_config_file() < 0)
1004                 goto finish;
1005
1006         if (arg_running_as == MANAGER_SYSTEM)
1007                 if (parse_proc_cmdline() < 0)
1008                         goto finish;
1009
1010         log_parse_environment();
1011
1012         if (parse_argv(argc, argv) < 0)
1013                 goto finish;
1014
1015         if (arg_action == ACTION_TEST && geteuid() == 0) {
1016                 log_error("Don't run test mode as root.");
1017                 goto finish;
1018         }
1019
1020         /* If Plymouth is being run make sure we show the status, so
1021          * that there's something nice to see when people press Esc */
1022         if (access("/dev/.systemd/plymouth", F_OK) >= 0)
1023                 arg_show_status = true;
1024
1025         if (arg_action == ACTION_HELP) {
1026                 retval = help();
1027                 goto finish;
1028         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
1029                 unit_dump_config_items(stdout);
1030                 retval = EXIT_SUCCESS;
1031                 goto finish;
1032         } else if (arg_action == ACTION_DONE) {
1033                 retval = EXIT_SUCCESS;
1034                 goto finish;
1035         }
1036
1037         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
1038
1039         /* Remember open file descriptors for later deserialization */
1040         if (serialization) {
1041                 if ((r = fdset_new_fill(&fds)) < 0) {
1042                         log_error("Failed to allocate fd set: %s", strerror(-r));
1043                         goto finish;
1044                 }
1045
1046                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
1047         } else
1048                 close_all_fds(NULL, 0);
1049
1050         /* Set up PATH unless it is already set */
1051         setenv("PATH",
1052                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
1053                arg_running_as == MANAGER_SYSTEM);
1054
1055         if (arg_running_as == MANAGER_SYSTEM) {
1056                 /* Parse the data passed to us by the initrd and unset it */
1057                 parse_initrd_timestamp(&initrd_timestamp);
1058                 filter_environ("RD_");
1059
1060                 /* Unset some environment variables passed in from the
1061                  * kernel that don't really make sense for us. */
1062                 unsetenv("HOME");
1063                 unsetenv("TERM");
1064         }
1065
1066         /* Move out of the way, so that we won't block unmounts */
1067         assert_se(chdir("/")  == 0);
1068
1069         if (arg_running_as == MANAGER_SYSTEM) {
1070                 /* Become a session leader if we aren't one yet. */
1071                 setsid();
1072
1073                 /* Disable the umask logic */
1074                 umask(0);
1075         }
1076
1077         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
1078         dbus_connection_set_change_sigpipe(FALSE);
1079
1080         /* Reset the console, but only if this is really init and we
1081          * are freshly booted */
1082         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
1083                 console_setup(getpid() == 1 && !serialization);
1084                 make_null_stdio();
1085         }
1086
1087         /* Open the logging devices, if possible and necessary */
1088         log_open();
1089
1090         /* Make sure we leave a core dump without panicing the
1091          * kernel. */
1092         if (getpid() == 1)
1093                 install_crash_handler();
1094
1095         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1096                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1097
1098         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1099                 locale_setup();
1100
1101                 if (arg_show_status)
1102                         status_welcome();
1103
1104                 kmod_setup();
1105                 hostname_setup();
1106                 loopback_setup();
1107
1108                 mkdir_p("/dev/.systemd/ask-password/", 0755);
1109
1110                 test_mtab();
1111         }
1112
1113         if ((r = manager_new(arg_running_as, &m)) < 0) {
1114                 log_error("Failed to allocate manager object: %s", strerror(-r));
1115                 goto finish;
1116         }
1117
1118         m->confirm_spawn = arg_confirm_spawn;
1119         m->show_status = arg_show_status;
1120 #ifdef HAVE_SYSV_COMPAT
1121         m->sysv_console = arg_sysv_console;
1122 #endif
1123         m->mount_auto = arg_mount_auto;
1124         m->swap_auto = arg_swap_auto;
1125         m->default_std_output = arg_default_std_output;
1126         m->default_std_error = arg_default_std_error;
1127
1128         if (dual_timestamp_is_set(&initrd_timestamp))
1129                 m->initrd_timestamp = initrd_timestamp;
1130
1131         if (arg_default_controllers)
1132                 manager_set_default_controllers(m, arg_default_controllers);
1133
1134         if ((r = manager_startup(m, serialization, fds)) < 0)
1135                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1136
1137         if (fds) {
1138                 /* This will close all file descriptors that were opened, but
1139                  * not claimed by any unit. */
1140
1141                 fdset_free(fds);
1142                 fds = NULL;
1143         }
1144
1145         if (serialization) {
1146                 fclose(serialization);
1147                 serialization = NULL;
1148         } else {
1149                 DBusError error;
1150                 Unit *target = NULL;
1151
1152                 dbus_error_init(&error);
1153
1154                 log_debug("Activating default unit: %s", arg_default_unit);
1155
1156                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1157                         log_error("Failed to load default target: %s", bus_error(&error, r));
1158                         dbus_error_free(&error);
1159                 } else if (target->meta.load_state == UNIT_ERROR)
1160                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1161                 else if (target->meta.load_state == UNIT_MASKED)
1162                         log_error("Default target masked.");
1163
1164                 if (!target || target->meta.load_state != UNIT_LOADED) {
1165                         log_info("Trying to load rescue target...");
1166
1167                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1168                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1169                                 dbus_error_free(&error);
1170                                 goto finish;
1171                         } else if (target->meta.load_state == UNIT_ERROR) {
1172                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1173                                 goto finish;
1174                         } else if (target->meta.load_state == UNIT_MASKED) {
1175                                 log_error("Rescue target masked.");
1176                                 goto finish;
1177                         }
1178                 }
1179
1180                 assert(target->meta.load_state == UNIT_LOADED);
1181
1182                 if (arg_action == ACTION_TEST) {
1183                         printf("-> By units:\n");
1184                         manager_dump_units(m, stdout, "\t");
1185                 }
1186
1187                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1188                         log_error("Failed to start default target: %s", bus_error(&error, r));
1189                         dbus_error_free(&error);
1190                         goto finish;
1191                 }
1192
1193                 if (arg_action == ACTION_TEST) {
1194                         printf("-> By jobs:\n");
1195                         manager_dump_jobs(m, stdout, "\t");
1196                         retval = EXIT_SUCCESS;
1197                         goto finish;
1198                 }
1199         }
1200
1201         for (;;) {
1202                 if ((r = manager_loop(m)) < 0) {
1203                         log_error("Failed to run mainloop: %s", strerror(-r));
1204                         goto finish;
1205                 }
1206
1207                 switch (m->exit_code) {
1208
1209                 case MANAGER_EXIT:
1210                         retval = EXIT_SUCCESS;
1211                         log_debug("Exit.");
1212                         goto finish;
1213
1214                 case MANAGER_RELOAD:
1215                         log_info("Reloading.");
1216                         if ((r = manager_reload(m)) < 0)
1217                                 log_error("Failed to reload: %s", strerror(-r));
1218                         break;
1219
1220                 case MANAGER_REEXECUTE:
1221                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1222                                 goto finish;
1223
1224                         reexecute = true;
1225                         log_notice("Reexecuting.");
1226                         goto finish;
1227
1228                 case MANAGER_REBOOT:
1229                 case MANAGER_POWEROFF:
1230                 case MANAGER_HALT:
1231                 case MANAGER_KEXEC: {
1232                         static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1233                                 [MANAGER_REBOOT] = "reboot",
1234                                 [MANAGER_POWEROFF] = "poweroff",
1235                                 [MANAGER_HALT] = "halt",
1236                                 [MANAGER_KEXEC] = "kexec"
1237                         };
1238
1239                         assert_se(shutdown_verb = table[m->exit_code]);
1240
1241                         log_notice("Shutting down.");
1242                         goto finish;
1243                 }
1244
1245                 default:
1246                         assert_not_reached("Unknown exit code.");
1247                 }
1248         }
1249
1250 finish:
1251         if (m)
1252                 manager_free(m);
1253
1254         free(arg_default_unit);
1255         strv_free(arg_default_controllers);
1256
1257         dbus_shutdown();
1258
1259         label_finish();
1260
1261         if (reexecute) {
1262                 const char *args[15];
1263                 unsigned i = 0;
1264                 char sfd[16];
1265
1266                 assert(serialization);
1267                 assert(fds);
1268
1269                 args[i++] = SYSTEMD_BINARY_PATH;
1270
1271                 args[i++] = "--log-level";
1272                 args[i++] = log_level_to_string(log_get_max_level());
1273
1274                 args[i++] = "--log-target";
1275                 args[i++] = log_target_to_string(log_get_target());
1276
1277                 if (arg_running_as == MANAGER_SYSTEM)
1278                         args[i++] = "--system";
1279                 else
1280                         args[i++] = "--user";
1281
1282                 if (arg_dump_core)
1283                         args[i++] = "--dump-core";
1284
1285                 if (arg_crash_shell)
1286                         args[i++] = "--crash-shell";
1287
1288                 if (arg_confirm_spawn)
1289                         args[i++] = "--confirm-spawn";
1290
1291                 if (arg_show_status)
1292                         args[i++] = "--show-status=1";
1293                 else
1294                         args[i++] = "--show-status=0";
1295
1296 #ifdef HAVE_SYSV_COMPAT
1297                 if (arg_sysv_console)
1298                         args[i++] = "--sysv-console=1";
1299                 else
1300                         args[i++] = "--sysv-console=0";
1301 #endif
1302
1303                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1304                 char_array_0(sfd);
1305
1306                 args[i++] = "--deserialize";
1307                 args[i++] = sfd;
1308
1309                 args[i++] = NULL;
1310
1311                 assert(i <= ELEMENTSOF(args));
1312
1313                 execv(args[0], (char* const*) args);
1314
1315                 log_error("Failed to reexecute: %m");
1316         }
1317
1318         if (serialization)
1319                 fclose(serialization);
1320
1321         if (fds)
1322                 fdset_free(fds);
1323
1324         if (shutdown_verb) {
1325                 const char * command_line[] = {
1326                         SYSTEMD_SHUTDOWN_BINARY_PATH,
1327                         shutdown_verb,
1328                         NULL
1329                 };
1330
1331                 execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line);
1332                 log_error("Failed to execute shutdown binary, freezing: %m");
1333         }
1334
1335         if (getpid() == 1)
1336                 freeze();
1337
1338         return retval;
1339 }