src/login/logind-action.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2012 Lennart Poettering
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include <unistd.h>
  22
  23 #include "alloc-util.h"
  24 #include "bus-error.h"
  25 #include "bus-util.h"
  26 #include "conf-parser.h"
  27 #include "format-util.h"
  28 #include "logind-action.h"
  29 #include "process-util.h"
  30 #include "sleep-config.h"
  31 #include "special.h"
  32 #include "string-table.h"
  33 #include "terminal-util.h"
  34 #include "user-util.h"
  35
  36 int manager_handle_action(
  37                 Manager *m,
  38                 InhibitWhat inhibit_key,
  39                 HandleAction handle,
  40                 bool ignore_inhibited,
  41                 bool is_edge) {
  42
  43         static const char * const message_table[_HANDLE_ACTION_MAX] = {
  44                 [HANDLE_POWEROFF] = "Powering Off...",
  45                 [HANDLE_REBOOT] = "Rebooting...",
  46                 [HANDLE_HALT] = "Halting...",
  47                 [HANDLE_KEXEC] = "Rebooting via kexec...",
  48                 [HANDLE_SUSPEND] = "Suspending...",
  49                 [HANDLE_HIBERNATE] = "Hibernating...",
  50                 [HANDLE_HYBRID_SLEEP] = "Hibernating and suspending...",
  51                 [HANDLE_SUSPEND_TO_HIBERNATE] = "Suspending to hibernate...",
  52         };
  53
  54         static const char * const target_table[_HANDLE_ACTION_MAX] = {
  55                 [HANDLE_POWEROFF] = SPECIAL_POWEROFF_TARGET,
  56                 [HANDLE_REBOOT] = SPECIAL_REBOOT_TARGET,
  57                 [HANDLE_HALT] = SPECIAL_HALT_TARGET,
  58                 [HANDLE_KEXEC] = SPECIAL_KEXEC_TARGET,
  59                 [HANDLE_SUSPEND] = SPECIAL_SUSPEND_TARGET,
  60                 [HANDLE_HIBERNATE] = SPECIAL_HIBERNATE_TARGET,
  61                 [HANDLE_HYBRID_SLEEP] = SPECIAL_HYBRID_SLEEP_TARGET,
  62                 [HANDLE_SUSPEND_TO_HIBERNATE] = SPECIAL_SUSPEND_TO_HIBERNATE_TARGET,
  63         };
  64
  65         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
  66         InhibitWhat inhibit_operation;
  67         Inhibitor *offending = NULL;
  68         bool supported;
  69         int r;
  70
  71         assert(m);
  72
  73         /* If the key handling is turned off, don't do anything */
  74         if (handle == HANDLE_IGNORE) {
  75                 log_debug("Refusing operation, as it is turned off.");
  76                 return 0;
  77         }
  78
  79         if (inhibit_key == INHIBIT_HANDLE_LID_SWITCH) {
  80                 /* If the last system suspend or startup is too close,
  81                  * let's not suspend for now, to give USB docking
  82                  * stations some time to settle so that we can
  83                  * properly watch its displays. */
  84                 if (m->lid_switch_ignore_event_source) {
  85                         log_debug("Ignoring lid switch request, system startup or resume too close.");
  86                         return 0;
  87                 }
  88         }
  89
  90         /* If the key handling is inhibited, don't do anything */
  91         if (inhibit_key > 0) {
  92                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0, NULL)) {
  93                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
  94                         return 0;
  95                 }
  96         }
  97
  98         /* Locking is handled differently from the rest. */
  99         if (handle == HANDLE_LOCK) {
 100
 101                 if (!is_edge)
 102                         return 0;
 103
 104                 log_info("Locking sessions...");
 105                 session_send_lock_all(m, true);
 106                 return 1;
 107         }
 108
 109         if (handle == HANDLE_SUSPEND)
 110                 supported = can_sleep("suspend") > 0;
 111         else if (handle == HANDLE_HIBERNATE)
 112                 supported = can_sleep("hibernate") > 0;
 113         else if (handle == HANDLE_HYBRID_SLEEP)
 114                 supported = can_sleep("hybrid-sleep") > 0;
 115         else if (handle == HANDLE_SUSPEND_TO_HIBERNATE)
 116                 supported = can_sleep("suspend-to-hibernate") > 0;
 117         else if (handle == HANDLE_KEXEC)
 118                 supported = access(KEXEC, X_OK) >= 0;
 119         else
 120                 supported = true;
 121
 122         if (!supported) {
 123                 log_warning("Requested operation not supported, ignoring.");
 124                 return -EOPNOTSUPP;
 125         }
 126
 127         if (m->action_what) {
 128                 log_debug("Action already in progress, ignoring.");
 129                 return -EALREADY;
 130         }
 131
 132         inhibit_operation = IN_SET(handle, HANDLE_SUSPEND, HANDLE_HIBERNATE,
 133                                            HANDLE_HYBRID_SLEEP,
 134                                            HANDLE_SUSPEND_TO_HIBERNATE) ? INHIBIT_SLEEP : INHIBIT_SHUTDOWN;
 135
 136         /* If the actual operation is inhibited, warn and fail */
 137         if (!ignore_inhibited &&
 138             manager_is_inhibited(m, inhibit_operation, INHIBIT_BLOCK, NULL, false, false, 0, &offending)) {
 139                 _cleanup_free_ char *comm = NULL, *u = NULL;
 140
 141                 get_process_comm(offending->pid, &comm);
 142                 u = uid_to_name(offending->uid);
 143
 144                 /* If this is just a recheck of the lid switch then don't warn about anything */
 145                 if (!is_edge) {
 146                         log_debug("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 147                                   inhibit_what_to_string(inhibit_operation),
 148                                   offending->uid, strna(u),
 149                                   offending->pid, strna(comm));
 150                         return 0;
 151                 }
 152
 153                 log_error("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 154                           inhibit_what_to_string(inhibit_operation),
 155                           offending->uid, strna(u),
 156                           offending->pid, strna(comm));
 157
 158                 return -EPERM;
 159         }
 160
 161         log_info("%s", message_table[handle]);
 162
 163         r = bus_manager_shutdown_or_sleep_now_or_later(m, target_table[handle], inhibit_operation, &error);
 164         if (r < 0) {
 165                 log_error("Failed to execute operation: %s", bus_error_message(&error, r));
 166                 return r;
 167         }
 168
 169         return 1;
 170 }
 171
 172 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 173         [HANDLE_IGNORE] = "ignore",
 174         [HANDLE_POWEROFF] = "poweroff",
 175         [HANDLE_REBOOT] = "reboot",
 176         [HANDLE_HALT] = "halt",
 177         [HANDLE_KEXEC] = "kexec",
 178         [HANDLE_SUSPEND] = "suspend",
 179         [HANDLE_HIBERNATE] = "hibernate",
 180         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 181         [HANDLE_SUSPEND_TO_HIBERNATE] = "suspend-to-hibernate",
 182         [HANDLE_LOCK] = "lock"
 183 };
 184
 185 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 186 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");