src/login/eloginctl.c

   1 /***
   2   This file is part of elogind.
   3
   4   Copyright 2017 Sven Eden
   5
   6   elogind is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   elogind is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with elogind; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20
  21 #include "bus-error.h"
  22 #include "bus-util.h"
  23 #include "eloginctl.h"
  24 #include "logind-action.h"
  25 #include "parse-util.h"
  26 #include "process-util.h"
  27 #include "sd-login.h"
  28 #include "sd-messages.h"
  29 #include "spawn-polkit-agent.h"
  30 #include "string-util.h"
  31 #include "strv.h"
  32 #include "terminal-util.h"
  33 #include "user-util.h"
  34 #include "virt.h"
  35
  36
  37 elogind_action arg_action            = _ACTION_INVALID;
  38 bool           arg_ask_password      = true;
  39 bool           arg_dry_run           = false;
  40 bool           arg_quiet             = false;
  41 bool           arg_ignore_inhibitors = false;
  42 bool           arg_no_wall           = false;
  43 BusTransport   arg_transport         = BUS_TRANSPORT_LOCAL;
  44 char**         arg_wall              = NULL;
  45 usec_t         arg_when              = 0;
  46
  47 static const struct {
  48         HandleAction action;
  49         const char*  verb;
  50 } action_table[_ACTION_MAX] = {
  51         [ACTION_HALT]         = { HANDLE_HALT,         "halt"         },
  52         [ACTION_POWEROFF]     = { HANDLE_POWEROFF,     "poweroff",    },
  53         [ACTION_REBOOT]       = { HANDLE_REBOOT,       "reboot",      },
  54         [ACTION_KEXEC]        = { HANDLE_KEXEC,        "kexec",       },
  55         [ACTION_SUSPEND]      = { HANDLE_SUSPEND,      "suspend",     },
  56         [ACTION_HIBERNATE]    = { HANDLE_HIBERNATE,    "hibernate",   },
  57         [ACTION_HYBRID_SLEEP] = { HANDLE_HYBRID_SLEEP, "hybrid-sleep" }
  58         /* ACTION_CANCEL_SHUTDOWN is handled differently */
  59 };
  60
  61 static int elogind_set_wall_message(sd_bus* bus, const char* msg);
  62
  63 static enum elogind_action verb_to_action(const char *verb) {
  64         enum elogind_action i;
  65
  66         for (i = _ACTION_INVALID; i < _ACTION_MAX; i++)
  67                 if (streq_ptr(action_table[i].verb, verb))
  68                         return i;
  69
  70         return _ACTION_INVALID;
  71 }
  72
  73 /* Original:
  74  * systemctl/systemctl.c:3314:logind_check_inhibitors()
  75  */
  76 static int check_inhibitors(sd_bus* bus, enum elogind_action a) {
  77         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
  78         _cleanup_strv_free_ char **sessions = NULL;
  79         const char *what, *who, *why, *mode;
  80         uint32_t uid, pid;
  81         unsigned c = 0;
  82         char **s;
  83         int r;
  84
  85         if (arg_ignore_inhibitors)
  86                 return 0;
  87
  88         if (arg_when > 0)
  89                 return 0;
  90
  91         if (geteuid() == 0)
  92                 return 0;
  93
  94         if (!on_tty())
  95                 return 0;
  96
  97         if (arg_transport != BUS_TRANSPORT_LOCAL)
  98                 return 0;
  99
 100         r = sd_bus_call_method(
 101                         bus,
 102                         "org.freedesktop.login1",
 103                         "/org/freedesktop/login1",
 104                         "org.freedesktop.login1.Manager",
 105                         "ListInhibitors",
 106                         NULL,
 107                         &reply,
 108                         NULL);
 109         if (r < 0)
 110                 /* If logind is not around, then there are no inhibitors... */
 111                 return 0;
 112
 113         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssuu)");
 114         if (r < 0)
 115                 return bus_log_parse_error(r);
 116
 117         while ((r = sd_bus_message_read(reply, "(ssssuu)", &what, &who, &why, &mode, &uid, &pid)) > 0) {
 118                 _cleanup_free_ char *comm = NULL, *user = NULL;
 119                 _cleanup_strv_free_ char **sv = NULL;
 120
 121                 if (!streq(mode, "block"))
 122                         continue;
 123
 124                 sv = strv_split(what, ":");
 125                 if (!sv)
 126                         return log_oom();
 127
 128                 if (!pid_is_valid((pid_t) pid)) {
 129                         log_error("Invalid PID "PID_FMT".", (pid_t) pid);
 130                         return -ERANGE;
 131                 }
 132
 133                 if (!strv_contains(sv,
 134                                    IN_SET(a,
 135                                           ACTION_HALT,
 136                                           ACTION_POWEROFF,
 137                                           ACTION_REBOOT,
 138                                           ACTION_KEXEC) ? "shutdown" : "sleep"))
 139                         continue;
 140
 141                 get_process_comm(pid, &comm);
 142                 user = uid_to_name(uid);
 143
 144                 log_warning("Operation inhibited by \"%s\" (PID "PID_FMT" \"%s\", user %s), reason is \"%s\".",
 145                             who, (pid_t) pid, strna(comm), strna(user), why);
 146
 147                 c++;
 148         }
 149         if (r < 0)
 150                 return bus_log_parse_error(r);
 151
 152         r = sd_bus_message_exit_container(reply);
 153         if (r < 0)
 154                 return bus_log_parse_error(r);
 155
 156         /* Check for current sessions */
 157         sd_get_sessions(&sessions);
 158         STRV_FOREACH(s, sessions) {
 159                 _cleanup_free_ char *type = NULL, *tty = NULL, *seat = NULL, *user = NULL, *service = NULL, *class = NULL;
 160
 161                 if (sd_session_get_uid(*s, &uid) < 0 || uid == getuid())
 162                         continue;
 163
 164                 if (sd_session_get_class(*s, &class) < 0 || !streq(class, "user"))
 165                         continue;
 166
 167                 if (sd_session_get_type(*s, &type) < 0 || !STR_IN_SET(type, "x11", "wayland", "tty", "mir"))
 168                         continue;
 169
 170                 sd_session_get_tty(*s, &tty);
 171                 sd_session_get_seat(*s, &seat);
 172                 sd_session_get_service(*s, &service);
 173                 user = uid_to_name(uid);
 174
 175                 log_warning("User %s is logged in on %s.", strna(user), isempty(tty) ? (isempty(seat) ? strna(service) : seat) : tty);
 176                 c++;
 177         }
 178
 179         if (c <= 0)
 180                 return 0;
 181
 182         log_error("Please retry operation after closing inhibitors and logging out other users.\nAlternatively, ignore inhibitors and users with 'loginctl %s -i'.",
 183                   action_table[a].verb);
 184
 185         return -EPERM;
 186 }
 187
 188 /* Original:
 189  * systemctl/systemctl.c:8683:logind_cancel_shutdown()
 190  */
 191 int elogind_cancel_shutdown(sd_bus *bus) {
 192         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 193         int r;
 194
 195         (void) elogind_set_wall_message(bus, NULL);
 196
 197         r = sd_bus_call_method(
 198                         bus,
 199                         "org.freedesktop.login1",
 200                         "/org/freedesktop/login1",
 201                         "org.freedesktop.login1.Manager",
 202                         "CancelScheduledShutdown",
 203                         &error,
 204                         NULL, NULL);
 205         if (r < 0)
 206                 return log_warning_errno(r,
 207                         "Failed to talk to elogind, shutdown hasn't been cancelled: %s",
 208                         bus_error_message(&error, r));
 209
 210         return 0;
 211 }
 212
 213 /* Only a little helper for cleaning up elogind specific extra stuff. */
 214 void elogind_cleanup(void) {
 215         polkit_agent_close();
 216         strv_free(arg_wall);
 217 }
 218
 219 /* Little debug log helper, helps debugging systemctl comands we mimic. */
 220 static void elogind_log_special(enum elogind_action a) {
 221 #if ENABLE_DEBUG_ELOGIND
 222         switch (a) {
 223         case ACTION_HALT:
 224                 log_struct(LOG_INFO,
 225                            LOG_MESSAGE("Halt action called."),
 226                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 227                            NULL);
 228                 break;
 229         case ACTION_POWEROFF:
 230                 log_struct(LOG_INFO,
 231                            LOG_MESSAGE("Poweroff action called."),
 232                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 233                            NULL);
 234                 break;
 235         case ACTION_REBOOT:
 236                 log_struct(LOG_INFO,
 237                            LOG_MESSAGE("Reboot action called."),
 238                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 239                            NULL);
 240                 break;
 241         case ACTION_KEXEC:
 242                 log_struct(LOG_INFO,
 243                            LOG_MESSAGE("KExec action called."),
 244                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 245                            NULL);
 246                 break;
 247         case ACTION_SUSPEND:
 248                 log_struct(LOG_INFO,
 249                            LOG_MESSAGE("Suspend action called."),
 250                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 251                            NULL);
 252                 break;
 253         case ACTION_HIBERNATE:
 254                 log_struct(LOG_INFO,
 255                            LOG_MESSAGE("Hibernate action called."),
 256                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 257                            NULL);
 258                 break;
 259         case ACTION_HYBRID_SLEEP:
 260                 log_struct(LOG_INFO,
 261                            LOG_MESSAGE("Hybrid-Sleep action called."),
 262                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 263                            NULL);
 264                 break;
 265         case ACTION_CANCEL_SHUTDOWN:
 266                 log_struct(LOG_INFO,
 267                            LOG_MESSAGE("Cancel Shutdown called."),
 268                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 269                            NULL);
 270                 break;
 271         default:
 272                 break;
 273         }
 274 #endif // ENABLE_DEBUG_ELOGIND
 275 }
 276
 277 /* Original:
 278  * systemctl/systemctl.c:3242:logind_reboot()
 279  */
 280 static int elogind_reboot(sd_bus *bus, enum elogind_action a) {
 281         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 282         const char *method  = NULL, *description = NULL;
 283         int r;
 284         static const char *table[_ACTION_MAX] = {
 285                 [ACTION_HALT]     = "The system is going down for halt NOW!",
 286                 [ACTION_REBOOT]   = "The system is going down for reboot NOW!",
 287                 [ACTION_POWEROFF] = "The system is going down for power-off NOW!"
 288         };
 289
 290         if (!bus)
 291                 return -EIO;
 292
 293         switch (a) {
 294
 295         case ACTION_HALT:
 296                 method = "Halt";
 297                 description = "halt system";
 298                 break;
 299
 300         case ACTION_POWEROFF:
 301                 method = "PowerOff";
 302                 description = "power off system";
 303                 break;
 304
 305         case ACTION_REBOOT:
 306                 method = "Reboot";
 307                 description = "reboot system";
 308                 break;
 309
 310         case ACTION_SUSPEND:
 311                 method = "Suspend";
 312                 description = "suspend system";
 313                 break;
 314
 315         case ACTION_HIBERNATE:
 316                 method = "Hibernate";
 317                 description = "hibernate system";
 318                 break;
 319
 320         case ACTION_HYBRID_SLEEP:
 321                 method = "HybridSleep";
 322                 description = "put system into hybrid sleep";
 323                 break;
 324
 325         default:
 326                 return -EINVAL;
 327         }
 328
 329         /* No need for polkit_agent_open_maybe() in elogind. Do it directly. */
 330         polkit_agent_open_if_enabled(arg_transport, arg_ask_password);
 331
 332         if ( IN_SET(a, ACTION_HALT, ACTION_POWEROFF, ACTION_REBOOT) )
 333                 (void) elogind_set_wall_message(bus, table[a]);
 334
 335         log_debug("%s org.freedesktop.login1.Manager %s dbus call.", arg_dry_run ? "Would execute" : "Executing", method);
 336
 337         if (arg_dry_run)
 338                 return 0;
 339
 340         /* Now call elogind itself to request the operation */
 341         r = sd_bus_call_method(
 342                         bus,
 343                         "org.freedesktop.login1",
 344                         "/org/freedesktop/login1",
 345                         "org.freedesktop.login1.Manager",
 346                         method,
 347                         &error,
 348                         NULL,
 349                         "b", arg_ask_password);
 350
 351         if (r < 0)
 352                 return log_error_errno(r, "Failed to %s via elogind: %s",
 353                                        description,
 354                                        bus_error_message(&error, r));
 355
 356         return 0;
 357 }
 358
 359 /* Original:
 360  * systemctl/systemctl.c:8553:logind_schedule_shutdown()
 361  */
 362 static int elogind_schedule_shutdown(sd_bus *bus, enum elogind_action a) {
 363         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 364         char date[FORMAT_TIMESTAMP_MAX];
 365         const char *action;
 366         int r;
 367
 368         if (!bus)
 369                 return -EIO;
 370
 371         switch (a) {
 372         case ACTION_HALT:
 373                 action = "halt";
 374                 break;
 375         case ACTION_POWEROFF:
 376                 action = "poweroff";
 377                 break;
 378         case ACTION_KEXEC:
 379                 action = "kexec";
 380                 break;
 381         case ACTION_REBOOT:
 382         default:
 383                 action = "reboot";
 384                 break;
 385         }
 386
 387         if (arg_dry_run)
 388                 action = strjoina("dry-", action);
 389
 390         (void) elogind_set_wall_message(bus, NULL);
 391
 392         r = sd_bus_call_method(
 393                         bus,
 394                         "org.freedesktop.login1",
 395                         "/org/freedesktop/login1",
 396                         "org.freedesktop.login1.Manager",
 397                         "ScheduleShutdown",
 398                         &error,
 399                         NULL,
 400                         "st",
 401                         action,
 402                         arg_when);
 403
 404         if (r < 0)
 405                 return log_warning_errno(r,
 406                                 "Failed to call ScheduleShutdown in logind, proceeding with immediate shutdown: %s",
 407                                 bus_error_message(&error, r));
 408
 409         if (!arg_quiet)
 410                 log_info("Shutdown scheduled for %s, use 'shutdown -c' to cancel.", format_timestamp(date, sizeof(date), arg_when));
 411
 412         return 0;
 413 }
 414
 415 /* Original:
 416  * systemctl/systemctl.c:3204:logind_set_wall_message()
 417  * (Tweaked to allow an extra message to be appended.)
 418  */
 419 static int elogind_set_wall_message(sd_bus* bus, const char* msg) {
 420         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 421         _cleanup_free_ char *m = NULL;
 422         int r;
 423
 424         if (strv_extend(&arg_wall, msg) < 0)
 425                 return log_oom();
 426
 427         m = strv_join(arg_wall, " ");
 428         if (!m)
 429                 return log_oom();
 430
 431         log_debug("%s wall message \"%s\".", arg_dry_run ? "Would set" : "Setting", m);
 432         if (arg_dry_run)
 433                 return 0;
 434
 435         r = sd_bus_call_method(
 436                         bus,
 437                         "org.freedesktop.login1",
 438                         "/org/freedesktop/login1",
 439                         "org.freedesktop.login1.Manager",
 440                         "SetWallMessage",
 441                         &error,
 442                         NULL,
 443                         "sb",
 444                         m,
 445                         !arg_no_wall);
 446
 447         if (r < 0)
 448                 return log_warning_errno(r, "Failed to set wall message, ignoring: %s", bus_error_message(&error, r));
 449
 450         return 0;
 451 }
 452
 453 /* Original:
 454  * systemctl/systemctl.c:7743:parse_shutdown_time_spec()
 455  */
 456 static int parse_shutdown_time_spec(const char *t, usec_t *_u) {
 457         assert(t);
 458         assert(_u);
 459
 460         if (streq(t, "now"))
 461                 *_u = 0;
 462         else if (!strchr(t, ':')) {
 463                 uint64_t u;
 464
 465                 if (safe_atou64(t, &u) < 0)
 466                         return -EINVAL;
 467
 468                 *_u = now(CLOCK_REALTIME) + USEC_PER_MINUTE * u;
 469         } else {
 470                 char *e = NULL;
 471                 long hour, minute;
 472                 struct tm tm = {};
 473                 time_t s;
 474                 usec_t n;
 475
 476                 errno = 0;
 477                 hour = strtol(t, &e, 10);
 478                 if (errno > 0 || *e != ':' || hour < 0 || hour > 23)
 479                         return -EINVAL;
 480
 481                 minute = strtol(e+1, &e, 10);
 482                 if (errno > 0 || *e != 0 || minute < 0 || minute > 59)
 483                         return -EINVAL;
 484
 485                 n = now(CLOCK_REALTIME);
 486                 s = (time_t) (n / USEC_PER_SEC);
 487
 488                 assert_se(localtime_r(&s, &tm));
 489
 490                 tm.tm_hour = (int) hour;
 491                 tm.tm_min = (int) minute;
 492                 tm.tm_sec = 0;
 493
 494                 assert_se(s = mktime(&tm));
 495
 496                 *_u = (usec_t) s * USEC_PER_SEC;
 497
 498                 while (*_u <= n)
 499                         *_u += USEC_PER_DAY;
 500         }
 501
 502         return 0;
 503 }
 504
 505 /* Original:
 506  * systemctl/systemctl.c:3482:start_special()
 507  * However, this elogind variant is very different from the original.
 508  */
 509 int start_special(int argc, char *argv[], void *userdata) {
 510         sd_bus *bus = userdata;
 511         enum elogind_action a;
 512         int r;
 513         char** wall = NULL;
 514
 515         assert(argv);
 516
 517         a = verb_to_action(argv[0]);
 518
 519         elogind_log_special(a);
 520
 521         /* For poweroff and reboot, some extra checks are performed: */
 522         if ( IN_SET(a, ACTION_POWEROFF, ACTION_REBOOT) ) {
 523
 524                 /* No power off actions in chroot environments */
 525                 if ( running_in_chroot() > 0 ) {
 526                         log_info("Running in chroot, ignoring request.");
 527                         return 0;
 528                 }
 529
 530                 /* Check time argument */
 531                 if ( (argc > 1) && (ACTION_CANCEL_SHUTDOWN != arg_action)) {
 532                         r = parse_shutdown_time_spec(argv[1], &arg_when);
 533                         if (r < 0) {
 534                                 log_error("Failed to parse time specification: %s", argv[optind]);
 535                                 return r;
 536                         }
 537                 }
 538
 539                 /* The optional user wall message must be set */
 540                 if ( (argc > 1)
 541                   && ( (arg_action == ACTION_CANCEL_SHUTDOWN)
 542                     || (0 == arg_when) ) )
 543                         /* No time argument for shutdown cancel, or no
 544                          * time argument given. */
 545                         wall = argv + 1;
 546                 else if (argc > 2)
 547                         /* We skip the time argument */
 548                         wall = argv + 2;
 549
 550                 if (wall) {
 551                         arg_wall = strv_copy(wall);
 552                         if (!arg_wall)
 553                                 return log_oom();
 554                 }
 555         }
 556
 557         /* Switch to cancel shutdown, if a shutdown action was requested,
 558            and the option to cancel it was set: */
 559         if ( IN_SET(a, ACTION_POWEROFF, ACTION_REBOOT)
 560           && (arg_action == ACTION_CANCEL_SHUTDOWN) )
 561                 return elogind_cancel_shutdown(bus);
 562
 563         r = check_inhibitors(bus, a);
 564         if (r < 0)
 565                 return r;
 566
 567         /* Perform requested action */
 568         if (IN_SET(a,
 569                    ACTION_POWEROFF,
 570                    ACTION_REBOOT,
 571                    ACTION_SUSPEND,
 572                    ACTION_HIBERNATE,
 573                    ACTION_HYBRID_SLEEP)) {
 574                 if (arg_when > 0)
 575                         return elogind_schedule_shutdown(bus, a);
 576                 else
 577                         return elogind_reboot(bus, a);
 578         }
 579
 580         return -EOPNOTSUPP;
 581 }
 582