src/login/logind-action.c

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