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_ignore_inhibitors = false;
  40 bool           arg_no_wall           = false;
  41 BusTransport   arg_transport         = BUS_TRANSPORT_LOCAL;
  42 char**         arg_wall              = NULL;
  43 usec_t         arg_when              = 0;
  44
  45 static const struct {
  46         HandleAction action;
  47         const char*  verb;
  48 } action_table[_ACTION_MAX] = {
  49         [ACTION_HALT]         = { HANDLE_HALT,         "halt"         },
  50         [ACTION_POWEROFF]     = { HANDLE_POWEROFF,     "poweroff",    },
  51         [ACTION_REBOOT]       = { HANDLE_REBOOT,       "reboot",      },
  52         [ACTION_KEXEC]        = { HANDLE_KEXEC,        "kexec",       },
  53         [ACTION_SUSPEND]      = { HANDLE_SUSPEND,      "suspend",     },
  54         [ACTION_HIBERNATE]    = { HANDLE_HIBERNATE,    "hibernate",   },
  55         [ACTION_HYBRID_SLEEP] = { HANDLE_HYBRID_SLEEP, "hybrid-sleep" }
  56         /* ACTION_CANCEL_SHUTDOWN is handled differently */
  57 };
  58
  59 static int elogind_set_wall_message(sd_bus* bus, const char* msg);
  60
  61 static enum elogind_action verb_to_action(const char *verb) {
  62         enum elogind_action i;
  63
  64         for (i = _ACTION_INVALID; i < _ACTION_MAX; i++)
  65                 if (streq_ptr(action_table[i].verb, verb))
  66                         return i;
  67
  68         return _ACTION_INVALID;
  69 }
  70
  71 /* Original:
  72  * systemctl/systemctl.c:3292:logind_check_inhibitors()
  73  */
  74 static int check_inhibitors(sd_bus* bus, enum elogind_action a) {
  75         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
  76         _cleanup_strv_free_ char **sessions = NULL;
  77         const char *what, *who, *why, *mode;
  78         uint32_t uid, pid;
  79         unsigned c = 0;
  80         char **s;
  81         int r;
  82
  83         if (arg_ignore_inhibitors)
  84                 return 0;
  85
  86         if (arg_when > 0)
  87                 return 0;
  88
  89         if (geteuid() == 0)
  90                 return 0;
  91
  92         if (!on_tty())
  93                 return 0;
  94
  95         if (arg_transport != BUS_TRANSPORT_LOCAL)
  96                 return 0;
  97
  98         r = sd_bus_call_method(
  99                         bus,
 100                         "org.freedesktop.login1",
 101                         "/org/freedesktop/login1",
 102                         "org.freedesktop.login1.Manager",
 103                         "ListInhibitors",
 104                         NULL,
 105                         &reply,
 106                         NULL);
 107         if (r < 0)
 108                 /* If logind is not around, then there are no inhibitors... */
 109                 return 0;
 110
 111         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssuu)");
 112         if (r < 0)
 113                 return bus_log_parse_error(r);
 114
 115         while ((r = sd_bus_message_read(reply, "(ssssuu)", &what, &who, &why, &mode, &uid, &pid)) > 0) {
 116                 _cleanup_free_ char *comm = NULL, *user = NULL;
 117                 _cleanup_strv_free_ char **sv = NULL;
 118
 119                 if (!streq(mode, "block"))
 120                         continue;
 121
 122                 sv = strv_split(what, ":");
 123                 if (!sv)
 124                         return log_oom();
 125
 126                 if ((pid_t) pid < 0)
 127                         return log_error_errno(ERANGE, "Bad PID %"PRIu32": %m", pid);
 128
 129                 if (!strv_contains(sv,
 130                                    IN_SET(a,
 131                                           ACTION_HALT,
 132                                           ACTION_POWEROFF,
 133                                           ACTION_REBOOT,
 134                                           ACTION_KEXEC) ? "shutdown" : "sleep"))
 135                         continue;
 136
 137                 get_process_comm(pid, &comm);
 138                 user = uid_to_name(uid);
 139
 140                 log_warning("Operation inhibited by \"%s\" (PID "PID_FMT" \"%s\", user %s), reason is \"%s\".",
 141                             who, (pid_t) pid, strna(comm), strna(user), why);
 142
 143                 c++;
 144         }
 145         if (r < 0)
 146                 return bus_log_parse_error(r);
 147
 148         r = sd_bus_message_exit_container(reply);
 149         if (r < 0)
 150                 return bus_log_parse_error(r);
 151
 152         /* Check for current sessions */
 153         sd_get_sessions(&sessions);
 154         STRV_FOREACH(s, sessions) {
 155                 _cleanup_free_ char *type = NULL, *tty = NULL, *seat = NULL, *user = NULL, *service = NULL, *class = NULL;
 156
 157                 if (sd_session_get_uid(*s, &uid) < 0 || uid == getuid())
 158                         continue;
 159
 160                 if (sd_session_get_class(*s, &class) < 0 || !streq(class, "user"))
 161                         continue;
 162
 163                 if (sd_session_get_type(*s, &type) < 0 || !STR_IN_SET(type, "x11", "tty"))
 164                         continue;
 165
 166                 sd_session_get_tty(*s, &tty);
 167                 sd_session_get_seat(*s, &seat);
 168                 sd_session_get_service(*s, &service);
 169                 user = uid_to_name(uid);
 170
 171                 log_warning("User %s is logged in on %s.", strna(user), isempty(tty) ? (isempty(seat) ? strna(service) : seat) : tty);
 172                 c++;
 173         }
 174
 175         if (c <= 0)
 176                 return 0;
 177
 178         log_error("Please retry operation after closing inhibitors and logging out other users.\nAlternatively, ignore inhibitors and users with 'loginctl %s -i'.",
 179                   action_table[a].verb);
 180
 181         return -EPERM;
 182 }
 183
 184 /* Original:
 185  * systemctl/systemctl.c:8410:logind_cancel_shutdown()
 186  */
 187 int elogind_cancel_shutdown(sd_bus *bus) {
 188         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 189         int r;
 190
 191         (void) elogind_set_wall_message(bus, NULL);
 192
 193         r = sd_bus_call_method(
 194                         bus,
 195                         "org.freedesktop.login1",
 196                         "/org/freedesktop/login1",
 197                         "org.freedesktop.login1.Manager",
 198                         "CancelScheduledShutdown",
 199                         &error,
 200                         NULL, NULL);
 201         if (r < 0)
 202                 return log_warning_errno(r,
 203                         "Failed to talk to elogind, shutdown hasn't been cancelled: %s",
 204                         bus_error_message(&error, r));
 205
 206         return 0;
 207 }
 208
 209 /* Only a little helper for cleaning up elogind specific extra stuff. */
 210 void elogind_cleanup(void) {
 211         polkit_agent_close();
 212         strv_free(arg_wall);
 213 }
 214
 215 /* Littel debug log helper, helps debugging systemctl comands we mimic. */
 216 static void elogind_log_special(enum elogind_action a) {
 217 #ifdef ENABLE_DEBUG_ELOGIND
 218         switch (a) {
 219         case ACTION_HALT:
 220                 log_struct(LOG_INFO,
 221                            LOG_MESSAGE("Halt action called."),
 222                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 223                            NULL);
 224                 break;
 225         case ACTION_POWEROFF:
 226                 log_struct(LOG_INFO,
 227                            LOG_MESSAGE("Poweroff action called."),
 228                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 229                            NULL);
 230                 break;
 231         case ACTION_REBOOT:
 232                 log_struct(LOG_INFO,
 233                            LOG_MESSAGE("Reboot action called."),
 234                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 235                            NULL);
 236                 break;
 237         case ACTION_KEXEC:
 238                 log_struct(LOG_INFO,
 239                            LOG_MESSAGE("KExec action called."),
 240                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 241                            NULL);
 242                 break;
 243         case ACTION_SUSPEND:
 244                 log_struct(LOG_INFO,
 245                            LOG_MESSAGE("Suspend action called."),
 246                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 247                            NULL);
 248                 break;
 249         case ACTION_HIBERNATE:
 250                 log_struct(LOG_INFO,
 251                            LOG_MESSAGE("Hibernate action called."),
 252                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 253                            NULL);
 254                 break;
 255         case ACTION_HYBRID_SLEEP:
 256                 log_struct(LOG_INFO,
 257                            LOG_MESSAGE("Hybrid-Sleep action called."),
 258                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 259                            NULL);
 260                 break;
 261         case ACTION_CANCEL_SHUTDOWN:
 262                 log_struct(LOG_INFO,
 263                            LOG_MESSAGE("Cancel Shutdown called."),
 264                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 265                            NULL);
 266                 break;
 267         default:
 268                 break;
 269         }
 270 #endif // ENABLE_DEBUG_ELOGIND
 271 }
 272
 273 /* Original:
 274  * systemctl/systemctl.c:3229:logind_reboot()
 275  */
 276 static int elogind_reboot(sd_bus *bus, enum elogind_action a) {
 277         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 278         const char *method  = NULL, *description = NULL;
 279         int r;
 280         static const char *table[_ACTION_MAX] = {
 281                 [ACTION_REBOOT]          = "The system is going down for reboot NOW!",
 282                 [ACTION_POWEROFF]        = "The system is going down for power-off NOW!"
 283         };
 284
 285         if (!bus)
 286                 return -EIO;
 287
 288         switch (a) {
 289
 290         case ACTION_REBOOT:
 291                 method = "Reboot";
 292                 description = "reboot system";
 293                 break;
 294
 295         case ACTION_POWEROFF:
 296                 method = "PowerOff";
 297                 description = "power off system";
 298                 break;
 299
 300         case ACTION_SUSPEND:
 301                 method = "Suspend";
 302                 description = "suspend system";
 303                 break;
 304
 305         case ACTION_HIBERNATE:
 306                 method = "Hibernate";
 307                 description = "hibernate system";
 308                 break;
 309
 310         case ACTION_HYBRID_SLEEP:
 311                 method = "HybridSleep";
 312                 description = "put system into hybrid sleep";
 313                 break;
 314
 315         default:
 316                 return -EINVAL;
 317         }
 318
 319         polkit_agent_open_if_enabled(arg_transport, arg_ask_password);
 320
 321         if ( IN_SET(a, ACTION_POWEROFF, ACTION_REBOOT) )
 322                 (void) elogind_set_wall_message(bus, table[a]);
 323
 324         /* Now call elogind itself to request the operation */
 325         r = sd_bus_call_method(
 326                         bus,
 327                         "org.freedesktop.login1",
 328                         "/org/freedesktop/login1",
 329                         "org.freedesktop.login1.Manager",
 330                         method,
 331                         &error,
 332                         NULL,
 333                         "b", arg_ask_password);
 334
 335         if (r < 0)
 336                 return log_error_errno(r, "Failed to %s via elogind: %s",
 337                                        description,
 338                                        bus_error_message(&error, r));
 339
 340         return 0;
 341 }
 342
 343 /* Original:
 344  * systemctl/systemctl.c:8281:logind_schedule_shutdown()
 345  */
 346 static int elogind_schedule_shutdown(sd_bus *bus, enum elogind_action a) {
 347         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 348         char date[FORMAT_TIMESTAMP_MAX];
 349         const char *action;
 350         int r;
 351
 352         if (!bus)
 353                 return -EIO;
 354
 355         switch (a) {
 356         case ACTION_HALT:
 357                 action = "halt";
 358                 break;
 359         case ACTION_POWEROFF:
 360                 action = "poweroff";
 361                 break;
 362         case ACTION_KEXEC:
 363                 action = "kexec";
 364                 break;
 365         case ACTION_REBOOT:
 366         default:
 367                 action = "reboot";
 368                 break;
 369         }
 370
 371         (void) elogind_set_wall_message(bus, NULL);
 372
 373         r = sd_bus_call_method(
 374                         bus,
 375                         "org.freedesktop.login1",
 376                         "/org/freedesktop/login1",
 377                         "org.freedesktop.login1.Manager",
 378                         "ScheduleShutdown",
 379                         &error,
 380                         NULL,
 381                         "st",
 382                         action,
 383                         arg_when);
 384
 385         if (r < 0)
 386                 return log_warning_errno(r,
 387                                 "Failed to call ScheduleShutdown in logind, proceeding with immediate shutdown: %s",
 388                                 bus_error_message(&error, r));
 389
 390         log_info("Shutdown scheduled for %s, use 'shutdown -c' to cancel.",
 391                  format_timestamp(date, sizeof(date), arg_when));
 392
 393         return 0;
 394 }
 395
 396 /* Original:
 397  * systemctl/systemctl.c:3193:logind_set_wall_message()
 398  * (Tweaked to allow an extra message to be appended.)
 399  */
 400 static int elogind_set_wall_message(sd_bus* bus, const char* msg) {
 401         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 402         _cleanup_free_ char *m = NULL;
 403         int r;
 404
 405         if (strv_extend(&arg_wall, msg) < 0)
 406                 return log_oom();
 407
 408         m = strv_join(arg_wall, " ");
 409         if (!m)
 410                 return log_oom();
 411
 412         r = sd_bus_call_method(
 413                         bus,
 414                         "org.freedesktop.login1",
 415                         "/org/freedesktop/login1",
 416                         "org.freedesktop.login1.Manager",
 417                         "SetWallMessage",
 418                         &error,
 419                         NULL,
 420                         "sb",
 421                         m,
 422                         !arg_no_wall);
 423
 424         if (r < 0)
 425                 return log_warning_errno(r, "Failed to set wall message, ignoring: %s", bus_error_message(&error, r));
 426
 427         return 0;
 428 }
 429
 430 /* Original:
 431  * systemctl/systemctl.c:7743:parse_shutdown_time_spec()
 432  */
 433 static int parse_shutdown_time_spec(const char *t, usec_t *_u) {
 434         assert(t);
 435         assert(_u);
 436
 437         if (streq(t, "now"))
 438                 *_u = 0;
 439         else if (!strchr(t, ':')) {
 440                 uint64_t u;
 441
 442                 if (safe_atou64(t, &u) < 0)
 443                         return -EINVAL;
 444
 445                 *_u = now(CLOCK_REALTIME) + USEC_PER_MINUTE * u;
 446         } else {
 447                 char *e = NULL;
 448                 long hour, minute;
 449                 struct tm tm = {};
 450                 time_t s;
 451                 usec_t n;
 452
 453                 errno = 0;
 454                 hour = strtol(t, &e, 10);
 455                 if (errno > 0 || *e != ':' || hour < 0 || hour > 23)
 456                         return -EINVAL;
 457
 458                 minute = strtol(e+1, &e, 10);
 459                 if (errno > 0 || *e != 0 || minute < 0 || minute > 59)
 460                         return -EINVAL;
 461
 462                 n = now(CLOCK_REALTIME);
 463                 s = (time_t) (n / USEC_PER_SEC);
 464
 465                 assert_se(localtime_r(&s, &tm));
 466
 467                 tm.tm_hour = (int) hour;
 468                 tm.tm_min = (int) minute;
 469                 tm.tm_sec = 0;
 470
 471                 assert_se(s = mktime(&tm));
 472
 473                 *_u = (usec_t) s * USEC_PER_SEC;
 474
 475                 while (*_u <= n)
 476                         *_u += USEC_PER_DAY;
 477         }
 478
 479         return 0;
 480 }
 481
 482 /* Original:
 483  * systemctl/systemctl.c:3482:start_special()
 484  * However, this elogind variant is very different from the original.
 485  */
 486 int start_special(int argc, char *argv[], void *userdata) {
 487         sd_bus *bus = userdata;
 488         enum elogind_action a;
 489         int r;
 490         char** wall = NULL;
 491
 492         assert(argv);
 493
 494         a = verb_to_action(argv[0]);
 495
 496         elogind_log_special(a);
 497
 498         /* For poweroff and reboot, some extra checks are performed: */
 499         if ( IN_SET(a, ACTION_POWEROFF, ACTION_REBOOT) ) {
 500
 501                 /* No power off actions in chroot environments */
 502                 if ( running_in_chroot() > 0 ) {
 503                         log_info("Running in chroot, ignoring request.");
 504                         return 0;
 505                 }
 506
 507                 /* Check time argument */
 508                 if ( (argc > 1) && (ACTION_CANCEL_SHUTDOWN != arg_action)) {
 509                         r = parse_shutdown_time_spec(argv[1], &arg_when);
 510                         if (r < 0) {
 511                                 log_error("Failed to parse time specification: %s", argv[optind]);
 512                                 return r;
 513                         }
 514                 }
 515
 516                 /* The optional user wall message must be set */
 517                 if ( (argc > 1)
 518                   && ( (arg_action == ACTION_CANCEL_SHUTDOWN)
 519                     || (0 == arg_when) ) )
 520                         /* No time argument for shutdown cancel, or no
 521                          * time argument given. */
 522                         wall = argv + 1;
 523                 else if (argc > 2)
 524                         /* We skip the time argument */
 525                         wall = argv + 2;
 526
 527                 if (wall) {
 528                         arg_wall = strv_copy(wall);
 529                         if (!arg_wall)
 530                                 return log_oom();
 531                 }
 532         }
 533
 534         /* Switch to cancel shutdown, if a shutdown action was requested,
 535            and the option to cancel it was set: */
 536         if ( IN_SET(a, ACTION_POWEROFF, ACTION_REBOOT)
 537           && (arg_action == ACTION_CANCEL_SHUTDOWN) )
 538                 return elogind_cancel_shutdown(bus);
 539
 540         r = check_inhibitors(bus, a);
 541         if (r < 0)
 542                 return r;
 543
 544         /* Perform requested action */
 545         if (IN_SET(a,
 546                    ACTION_POWEROFF,
 547                    ACTION_REBOOT,
 548                    ACTION_SUSPEND,
 549                    ACTION_HIBERNATE,
 550                    ACTION_HYBRID_SLEEP)) {
 551                 if (arg_when > 0)
 552                         return elogind_schedule_shutdown(bus, a);
 553                 else
 554                         return elogind_reboot(bus, a);
 555         }
 556
 557         return -EOPNOTSUPP;
 558 }
 559