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         };
  52
  53         static const char * const target_table[_HANDLE_ACTION_MAX] = {
  54                 [HANDLE_POWEROFF] = SPECIAL_POWEROFF_TARGET,
  55                 [HANDLE_REBOOT] = SPECIAL_REBOOT_TARGET,
  56                 [HANDLE_HALT] = SPECIAL_HALT_TARGET,
  57                 [HANDLE_KEXEC] = SPECIAL_KEXEC_TARGET,
  58                 [HANDLE_SUSPEND] = SPECIAL_SUSPEND_TARGET,
  59                 [HANDLE_HIBERNATE] = SPECIAL_HIBERNATE_TARGET,
  60                 [HANDLE_HYBRID_SLEEP] = SPECIAL_HYBRID_SLEEP_TARGET
  61         };
  62
  63         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
  64         InhibitWhat inhibit_operation;
  65         Inhibitor *offending = NULL;
  66         bool supported;
  67         int r;
  68
  69         assert(m);
  70
  71         /* If the key handling is turned off, don't do anything */
  72         if (handle == HANDLE_IGNORE) {
  73                 log_debug("Refusing operation, as it is turned off.");
  74                 return 0;
  75         }
  76
  77         if (inhibit_key == INHIBIT_HANDLE_LID_SWITCH) {
  78                 /* If the last system suspend or startup is too close,
  79                  * let's not suspend for now, to give USB docking
  80                  * stations some time to settle so that we can
  81                  * properly watch its displays. */
  82                 if (m->lid_switch_ignore_event_source) {
  83                         log_debug("Ignoring lid switch request, system startup or resume too close.");
  84                         return 0;
  85                 }
  86         }
  87
  88         /* If the key handling is inhibited, don't do anything */
  89         if (inhibit_key > 0) {
  90                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0, NULL)) {
  91                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
  92                         return 0;
  93                 }
  94         }
  95
  96         /* Locking is handled differently from the rest. */
  97         if (handle == HANDLE_LOCK) {
  98
  99                 if (!is_edge)
 100                         return 0;
 101
 102                 log_info("Locking sessions...");
 103                 session_send_lock_all(m, true);
 104                 return 1;
 105         }
 106
 107         if (handle == HANDLE_SUSPEND)
 108                 supported = can_sleep("suspend") > 0;
 109         else if (handle == HANDLE_HIBERNATE)
 110                 supported = can_sleep("hibernate") > 0;
 111         else if (handle == HANDLE_HYBRID_SLEEP)
 112                 supported = can_sleep("hybrid-sleep") > 0;
 113         else if (handle == HANDLE_KEXEC)
 114                 supported = access(KEXEC, X_OK) >= 0;
 115         else
 116                 supported = true;
 117
 118         if (!supported) {
 119                 log_warning("Requested operation not supported, ignoring.");
 120                 return -EOPNOTSUPP;
 121         }
 122
 123         if (m->action_what) {
 124                 log_debug("Action already in progress, ignoring.");
 125                 return -EALREADY;
 126         }
 127
 128         inhibit_operation = IN_SET(handle, HANDLE_SUSPEND, HANDLE_HIBERNATE, HANDLE_HYBRID_SLEEP) ? INHIBIT_SLEEP : INHIBIT_SHUTDOWN;
 129
 130         /* If the actual operation is inhibited, warn and fail */
 131         if (!ignore_inhibited &&
 132             manager_is_inhibited(m, inhibit_operation, INHIBIT_BLOCK, NULL, false, false, 0, &offending)) {
 133                 _cleanup_free_ char *comm = NULL, *u = NULL;
 134
 135                 get_process_comm(offending->pid, &comm);
 136                 u = uid_to_name(offending->uid);
 137
 138                 /* If this is just a recheck of the lid switch then don't warn about anything */
 139                 if (!is_edge) {
 140                         log_debug("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 141                                   inhibit_what_to_string(inhibit_operation),
 142                                   offending->uid, strna(u),
 143                                   offending->pid, strna(comm));
 144                         return 0;
 145                 }
 146
 147                 log_error("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 148                           inhibit_what_to_string(inhibit_operation),
 149                           offending->uid, strna(u),
 150                           offending->pid, strna(comm));
 151
 152                 return -EPERM;
 153         }
 154
 155         log_info("%s", message_table[handle]);
 156
 157         r = bus_manager_shutdown_or_sleep_now_or_later(m, target_table[handle], inhibit_operation, &error);
 158         if (r < 0) {
 159                 log_error("Failed to execute operation: %s", bus_error_message(&error, r));
 160                 return r;
 161         }
 162
 163         return 1;
 164 }
 165
 166 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 167         [HANDLE_IGNORE] = "ignore",
 168         [HANDLE_POWEROFF] = "poweroff",
 169         [HANDLE_REBOOT] = "reboot",
 170         [HANDLE_HALT] = "halt",
 171         [HANDLE_KEXEC] = "kexec",
 172         [HANDLE_SUSPEND] = "suspend",
 173         [HANDLE_HIBERNATE] = "hibernate",
 174         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 175         [HANDLE_LOCK] = "lock"
 176 };
 177
 178 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 179 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");