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_POWEROFF]     = { HANDLE_POWEROFF,     "poweroff",    },
  50         [ACTION_REBOOT]       = { HANDLE_REBOOT,       "reboot",      },
  51         [ACTION_SUSPEND]      = { HANDLE_SUSPEND,      "suspend",     },
  52         [ACTION_HIBERNATE]    = { HANDLE_HIBERNATE,    "hibernate",   },
  53         [ACTION_HYBRID_SLEEP] = { HANDLE_HYBRID_SLEEP, "hybrid-sleep" },
  54 };
  55
  56 static int elogind_set_wall_message(sd_bus* bus, const char* msg);
  57
  58 static enum elogind_action verb_to_action(const char *verb) {
  59         enum elogind_action i;
  60
  61         for (i = _ACTION_INVALID; i < _ACTION_MAX; i++)
  62                 if (streq_ptr(action_table[i].verb, verb))
  63                         return i;
  64
  65         return _ACTION_INVALID;
  66 }
  67
  68 /* Original:
  69  * systemctl/systemctl.c:3292:logind_check_inhibitors()
  70  */
  71 static int check_inhibitors(sd_bus* bus, enum elogind_action a) {
  72         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
  73         _cleanup_strv_free_ char **sessions = NULL;
  74         const char *what, *who, *why, *mode;
  75         uint32_t uid, pid;
  76         unsigned c = 0;
  77         char **s;
  78         int r;
  79
  80         if (arg_ignore_inhibitors)
  81                 return 0;
  82
  83         if (arg_when > 0)
  84                 return 0;
  85
  86         if (geteuid() == 0)
  87                 return 0;
  88
  89         if (!on_tty())
  90                 return 0;
  91
  92         if (arg_transport != BUS_TRANSPORT_LOCAL)
  93                 return 0;
  94
  95         r = sd_bus_call_method(
  96                         bus,
  97                         "org.freedesktop.login1",
  98                         "/org/freedesktop/login1",
  99                         "org.freedesktop.login1.Manager",
 100                         "ListInhibitors",
 101                         NULL,
 102                         &reply,
 103                         NULL);
 104         if (r < 0)
 105                 /* If logind is not around, then there are no inhibitors... */
 106                 return 0;
 107
 108         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssuu)");
 109         if (r < 0)
 110                 return bus_log_parse_error(r);
 111
 112         while ((r = sd_bus_message_read(reply, "(ssssuu)", &what, &who, &why, &mode, &uid, &pid)) > 0) {
 113                 _cleanup_free_ char *comm = NULL, *user = NULL;
 114                 _cleanup_strv_free_ char **sv = NULL;
 115
 116                 if (!streq(mode, "block"))
 117                         continue;
 118
 119                 sv = strv_split(what, ":");
 120                 if (!sv)
 121                         return log_oom();
 122
 123                 if ((pid_t) pid < 0)
 124                         return log_error_errno(ERANGE, "Bad PID %"PRIu32": %m", pid);
 125
 126                 if (!strv_contains(sv,
 127                                    IN_SET(a,
 128                                           ACTION_HALT,
 129                                           ACTION_POWEROFF,
 130                                           ACTION_REBOOT,
 131                                           ACTION_KEXEC) ? "shutdown" : "sleep"))
 132                         continue;
 133
 134                 get_process_comm(pid, &comm);
 135                 user = uid_to_name(uid);
 136
 137                 log_warning("Operation inhibited by \"%s\" (PID "PID_FMT" \"%s\", user %s), reason is \"%s\".",
 138                             who, (pid_t) pid, strna(comm), strna(user), why);
 139
 140                 c++;
 141         }
 142         if (r < 0)
 143                 return bus_log_parse_error(r);
 144
 145         r = sd_bus_message_exit_container(reply);
 146         if (r < 0)
 147                 return bus_log_parse_error(r);
 148
 149         /* Check for current sessions */
 150         sd_get_sessions(&sessions);
 151         STRV_FOREACH(s, sessions) {
 152                 _cleanup_free_ char *type = NULL, *tty = NULL, *seat = NULL, *user = NULL, *service = NULL, *class = NULL;
 153
 154                 if (sd_session_get_uid(*s, &uid) < 0 || uid == getuid())
 155                         continue;
 156
 157                 if (sd_session_get_class(*s, &class) < 0 || !streq(class, "user"))
 158                         continue;
 159
 160                 if (sd_session_get_type(*s, &type) < 0 || !STR_IN_SET(type, "x11", "tty"))
 161                         continue;
 162
 163                 sd_session_get_tty(*s, &tty);
 164                 sd_session_get_seat(*s, &seat);
 165                 sd_session_get_service(*s, &service);
 166                 user = uid_to_name(uid);
 167
 168                 log_warning("User %s is logged in on %s.", strna(user), isempty(tty) ? (isempty(seat) ? strna(service) : seat) : tty);
 169                 c++;
 170         }
 171
 172         if (c <= 0)
 173                 return 0;
 174
 175         log_error("Please retry operation after closing inhibitors and logging out other users.\nAlternatively, ignore inhibitors and users with 'loginctl %s -i'.",
 176                   action_table[a].verb);
 177
 178         return -EPERM;
 179 }
 180
 181 /* Original:
 182  * systemctl/systemctl.c:8410:logind_cancel_shutdown()
 183  */
 184 int elogind_cancel_shutdown(sd_bus *bus) {
 185         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 186         int r;
 187
 188         (void) elogind_set_wall_message(bus, NULL);
 189
 190         r = sd_bus_call_method(
 191                         bus,
 192                         "org.freedesktop.login1",
 193                         "/org/freedesktop/login1",
 194                         "org.freedesktop.login1.Manager",
 195                         "CancelScheduledShutdown",
 196                         &error,
 197                         NULL, NULL);
 198         if (r < 0)
 199                 return log_warning_errno(r,
 200                         "Failed to talk to elogind, shutdown hasn't been cancelled: %s",
 201                         bus_error_message(&error, r));
 202
 203         return 0;
 204 }
 205
 206 /* Only a little helper for cleaning up elogind specific extra stuff. */
 207 void elogind_cleanup(void) {
 208         polkit_agent_close();
 209         strv_free(arg_wall);
 210 }
 211
 212 /* Littel debug log helper, helps debugging systemctl comands we mimic. */
 213 static void elogind_log_special(enum elogind_action a) {
 214 #ifdef ENABLE_DEBUG_ELOGIND
 215         switch (a) {
 216         case ACTION_HALT:
 217                 log_struct(LOG_INFO,
 218                            LOG_MESSAGE("Halt action called."),
 219                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 220                            NULL);
 221                 break;
 222         case ACTION_POWEROFF:
 223                 log_struct(LOG_INFO,
 224                            LOG_MESSAGE("Poweroff action called."),
 225                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 226                            NULL);
 227                 break;
 228         case ACTION_REBOOT:
 229                 log_struct(LOG_INFO,
 230                            LOG_MESSAGE("Reboot action called."),
 231                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 232                            NULL);
 233                 break;
 234         case ACTION_KEXEC:
 235                 log_struct(LOG_INFO,
 236                            LOG_MESSAGE("KExec action called."),
 237                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 238                            NULL);
 239                 break;
 240         case ACTION_SUSPEND:
 241                 log_struct(LOG_INFO,
 242                            LOG_MESSAGE("Suspend action called."),
 243                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 244                            NULL);
 245                 break;
 246         case ACTION_HIBERNATE:
 247                 log_struct(LOG_INFO,
 248                            LOG_MESSAGE("Hibernate action called."),
 249                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 250                            NULL);
 251                 break;
 252         case ACTION_HYBRID_SLEEP:
 253                 log_struct(LOG_INFO,
 254                            LOG_MESSAGE("Hybrid-Sleep action called."),
 255                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 256                            NULL);
 257                 break;
 258         case ACTION_CANCEL_SHUTDOWN:
 259                 log_struct(LOG_INFO,
 260                            LOG_MESSAGE("Cancel Shutdown called."),
 261                            "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_STR,
 262                            NULL);
 263                 break;
 264         default:
 265                 break;
 266         }
 267 #endif // ENABLE_DEBUG_ELOGIND
 268 }
 269
 270 /* Original:
 271  * systemctl/systemctl.c:3229:logind_reboot()
 272  */
 273 static int elogind_reboot(sd_bus *bus, enum elogind_action a) {
 274         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 275         const char *method  = NULL, *description = NULL;
 276         int r;
 277         static const char *table[_ACTION_MAX] = {
 278                 [ACTION_REBOOT]          = "The system is going down for reboot NOW!",
 279                 [ACTION_POWEROFF]        = "The system is going down for power-off NOW!"
 280         };
 281
 282         if (!bus)
 283                 return -EIO;
 284
 285         switch (a) {
 286
 287         case ACTION_REBOOT:
 288                 method = "Reboot";
 289                 description = "reboot system";
 290                 break;
 291
 292         case ACTION_POWEROFF:
 293                 method = "PowerOff";
 294                 description = "power off system";
 295                 break;
 296
 297         case ACTION_SUSPEND:
 298                 method = "Suspend";
 299                 description = "suspend system";
 300                 break;
 301
 302         case ACTION_HIBERNATE:
 303                 method = "Hibernate";
 304                 description = "hibernate system";
 305                 break;
 306
 307         case ACTION_HYBRID_SLEEP:
 308                 method = "HybridSleep";
 309                 description = "put system into hybrid sleep";
 310                 break;
 311
 312         default:
 313                 return -EINVAL;
 314         }
 315
 316         polkit_agent_open_if_enabled();
 317
 318         if ( IN_SET(a, ACTION_POWEROFF, ACTION_REBOOT) )
 319                 (void) elogind_set_wall_message(bus, table[a]);
 320
 321         /* Now call elogind itself to request the operation */
 322         r = sd_bus_call_method(
 323                         bus,
 324                         "org.freedesktop.login1",
 325                         "/org/freedesktop/login1",
 326                         "org.freedesktop.login1.Manager",
 327                         method,
 328                         &error,
 329                         NULL,
 330                         "b", arg_ask_password);
 331
 332         if (r < 0)
 333                 return log_error_errno(r, "Failed to %s via elogind: %s",
 334                                        description,
 335                                        bus_error_message(&error, r));
 336
 337         return 0;
 338 }
 339
 340 /* Original:
 341  * systemctl/systemctl.c:8281:logind_schedule_shutdown()
 342  */
 343 static int elogind_schedule_shutdown(sd_bus *bus, enum elogind_action a) {
 344         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 345         char date[FORMAT_TIMESTAMP_MAX];
 346         const char *action;
 347         int r;
 348
 349         if (!bus)
 350                 return -EIO;
 351
 352         switch (a) {
 353         case ACTION_HALT:
 354                 action = "halt";
 355                 break;
 356         case ACTION_POWEROFF:
 357                 action = "poweroff";
 358                 break;
 359         case ACTION_KEXEC:
 360                 action = "kexec";
 361                 break;
 362         case ACTION_REBOOT:
 363         default:
 364                 action = "reboot";
 365                 break;
 366         }
 367
 368         (void) elogind_set_wall_message(bus, NULL);
 369
 370         r = sd_bus_call_method(
 371                         bus,
 372                         "org.freedesktop.login1",
 373                         "/org/freedesktop/login1",
 374                         "org.freedesktop.login1.Manager",
 375                         "ScheduleShutdown",
 376                         &error,
 377                         NULL,
 378                         "st",
 379                         action,
 380                         arg_when);
 381
 382         if (r < 0)
 383                 return log_warning_errno(r,
 384                                 "Failed to call ScheduleShutdown in logind, proceeding with immediate shutdown: %s",
 385                                 bus_error_message(&error, r));
 386
 387         log_info("Shutdown scheduled for %s, use 'shutdown -c' to cancel.",
 388                  format_timestamp(date, sizeof(date), arg_when));
 389
 390         return 0;
 391 }
 392
 393 /* Original:
 394  * systemctl/systemctl.c:3193:logind_set_wall_message()
 395  * (Tweaked to allow an extra message to be appended.)
 396  */
 397 static int elogind_set_wall_message(sd_bus* bus, const char* msg) {
 398         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 399         _cleanup_free_ char *m = NULL;
 400         int r;
 401
 402         if (strv_extend(&arg_wall, msg) < 0)
 403                 return log_oom();
 404
 405         m = strv_join(arg_wall, " ");
 406         if (!m)
 407                 return log_oom();
 408
 409         r = sd_bus_call_method(
 410                         bus,
 411                         "org.freedesktop.login1",
 412                         "/org/freedesktop/login1",
 413                         "org.freedesktop.login1.Manager",
 414                         "SetWallMessage",
 415                         &error,
 416                         NULL,
 417                         "sb",
 418                         m,
 419                         !arg_no_wall);
 420
 421         if (r < 0)
 422                 return log_warning_errno(r, "Failed to set wall message, ignoring: %s", bus_error_message(&error, r));
 423
 424         return 0;
 425 }
 426
 427 /* Original:
 428  * systemctl/systemctl.c:7743:parse_shutdown_time_spec()
 429  */
 430 static int parse_shutdown_time_spec(const char *t, usec_t *_u) {
 431         assert(t);
 432         assert(_u);
 433
 434         if (streq(t, "now"))
 435                 *_u = 0;
 436         else if (!strchr(t, ':')) {
 437                 uint64_t u;
 438
 439                 if (safe_atou64(t, &u) < 0)
 440                         return -EINVAL;
 441
 442                 *_u = now(CLOCK_REALTIME) + USEC_PER_MINUTE * u;
 443         } else {
 444                 char *e = NULL;
 445                 long hour, minute;
 446                 struct tm tm = {};
 447                 time_t s;
 448                 usec_t n;
 449
 450                 errno = 0;
 451                 hour = strtol(t, &e, 10);
 452                 if (errno > 0 || *e != ':' || hour < 0 || hour > 23)
 453                         return -EINVAL;
 454
 455                 minute = strtol(e+1, &e, 10);
 456                 if (errno > 0 || *e != 0 || minute < 0 || minute > 59)
 457                         return -EINVAL;
 458
 459                 n = now(CLOCK_REALTIME);
 460                 s = (time_t) (n / USEC_PER_SEC);
 461
 462                 assert_se(localtime_r(&s, &tm));
 463
 464                 tm.tm_hour = (int) hour;
 465                 tm.tm_min = (int) minute;
 466                 tm.tm_sec = 0;
 467
 468                 assert_se(s = mktime(&tm));
 469
 470                 *_u = (usec_t) s * USEC_PER_SEC;
 471
 472                 while (*_u <= n)
 473                         *_u += USEC_PER_DAY;
 474         }
 475
 476         return 0;
 477 }
 478
 479 /* Original:
 480  * systemctl/systemctl.c:270:polkit_agent_open_if_enabled()
 481  */
 482 void polkit_agent_open_if_enabled(void) {
 483
 484         /* Open the polkit agent as a child process if necessary */
 485
 486         if (!arg_ask_password)
 487                 return;
 488
 489         if (arg_transport != BUS_TRANSPORT_LOCAL)
 490                 return;
 491
 492         polkit_agent_open();
 493 }
 494
 495 /* Original:
 496  * systemctl/systemctl.c:3482:start_special()
 497  * However, this elogind variant is very different from the original.
 498  */
 499 int start_special(int argc, char *argv[], void *userdata) {
 500         sd_bus *bus = userdata;
 501         enum elogind_action a;
 502         int r;
 503         char** wall = NULL;
 504
 505         assert(argv);
 506
 507         a = verb_to_action(argv[0]);
 508
 509         elogind_log_special(a);
 510
 511         /* For poweroff and reboot, some extra checks are performed: */
 512         if ( IN_SET(a, ACTION_POWEROFF, ACTION_REBOOT) ) {
 513
 514                 /* No power off actions in chroot environments */
 515                 if ( running_in_chroot() > 0 ) {
 516                         log_info("Running in chroot, ignoring request.");
 517                         return 0;
 518                 }
 519
 520                 /* Check time argument */
 521                 if ( (argc > 1) && (ACTION_CANCEL_SHUTDOWN != arg_action)) {
 522                         r = parse_shutdown_time_spec(argv[1], &arg_when);
 523                         if (r < 0) {
 524                                 log_error("Failed to parse time specification: %s", argv[optind]);
 525                                 return r;
 526                         }
 527                 }
 528
 529                 /* The optional user wall message must be set */
 530                 if ( (argc > 1)
 531                   && ( (arg_action == ACTION_CANCEL_SHUTDOWN)
 532                     || (0 == arg_when) ) )
 533                         /* No time argument for shutdown cancel, or no
 534                          * time argument given. */
 535                         wall = argv + 1;
 536                 else if (argc > 2)
 537                         /* We skip the time argument */
 538                         wall = argv + 2;
 539
 540                 if (wall) {
 541                         arg_wall = strv_copy(wall);
 542                         if (!arg_wall)
 543                                 return log_oom();
 544                 }
 545         }
 546
 547         /* Switch to cancel shutdown, if a shutdown action was requested,
 548            and the option to cancel it was set: */
 549         if ( IN_SET(a, ACTION_POWEROFF, ACTION_REBOOT)
 550           && (arg_action == ACTION_CANCEL_SHUTDOWN) )
 551                 return elogind_cancel_shutdown(bus);
 552
 553         r = check_inhibitors(bus, a);
 554         if (r < 0)
 555                 return r;
 556
 557         /* Perform requested action */
 558         if (IN_SET(a,
 559                    ACTION_POWEROFF,
 560                    ACTION_REBOOT,
 561                    ACTION_SUSPEND,
 562                    ACTION_HIBERNATE,
 563                    ACTION_HYBRID_SLEEP)) {
 564                 if (arg_when > 0)
 565                         return elogind_schedule_shutdown(bus, a);
 566                 else
 567                         return elogind_reboot(bus, a);
 568         }
 569
 570         return -EOPNOTSUPP;
 571 }
 572