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