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