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