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 "sd-messages.h"
  25 #include "conf-parser.h"
  26 #include "special.h"
  27 #include "sleep-config.h"
  28 #include "bus-util.h"
  29 #include "bus-error.h"
  30 #include "logind-action.h"
  31
  32 int manager_handle_action(
  33                 Manager *m,
  34                 InhibitWhat inhibit_key,
  35                 HandleAction handle,
  36                 bool ignore_inhibited,
  37                 bool is_edge) {
  38
  39         static const char * const message_table[_HANDLE_ACTION_MAX] = {
  40                 [HANDLE_POWEROFF] = "Powering Off...",
  41                 [HANDLE_REBOOT] = "Rebooting...",
  42                 [HANDLE_HALT] = "Halting...",
  43                 [HANDLE_KEXEC] = "Rebooting via kexec...",
  44                 [HANDLE_SUSPEND] = "Suspending...",
  45                 [HANDLE_HIBERNATE] = "Hibernating...",
  46                 [HANDLE_HYBRID_SLEEP] = "Hibernating and suspending..."
  47         };
  48
  49         static const char * const target_table[_HANDLE_ACTION_MAX] = {
  50                 [HANDLE_POWEROFF] = SPECIAL_POWEROFF_TARGET,
  51                 [HANDLE_REBOOT] = SPECIAL_REBOOT_TARGET,
  52                 [HANDLE_HALT] = SPECIAL_HALT_TARGET,
  53                 [HANDLE_KEXEC] = SPECIAL_KEXEC_TARGET,
  54                 [HANDLE_SUSPEND] = SPECIAL_SUSPEND_TARGET,
  55                 [HANDLE_HIBERNATE] = SPECIAL_HIBERNATE_TARGET,
  56                 [HANDLE_HYBRID_SLEEP] = SPECIAL_HYBRID_SLEEP_TARGET
  57         };
  58
  59         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
  60         InhibitWhat inhibit_operation;
  61         Inhibitor *offending = NULL;
  62         bool supported;
  63         int r;
  64
  65         assert(m);
  66
  67         /* If the key handling is turned off, don't do anything */
  68         if (handle == HANDLE_IGNORE) {
  69                 log_debug("Refusing operation, as it is turned off.");
  70                 return 0;
  71         }
  72
  73         if (inhibit_key == INHIBIT_HANDLE_LID_SWITCH) {
  74                 int n;
  75
  76                 /* If we are docked don't react to lid closing */
  77                 if (manager_is_docked(m)) {
  78                         log_debug("Ignoring lid switch request, system is docked.");
  79                         return 0;
  80                 }
  81
  82                 /* If we have more than one display connected,
  83                  * don't react to lid closing. */
  84                 n = manager_count_displays(m);
  85                 if (n < 0)
  86                         log_warning("Display counting failed: %s", strerror(-n));
  87                 else if (n > 1) {
  88                         log_debug("Ignoring lid switch request, %i displays connected.", n);
  89                         return 0;
  90                 }
  91
  92                 /* If the last system suspend or startup is too close,
  93                  * let's not suspend for now, to give USB docking
  94                  * stations some time to settle so that we can
  95                  * properly watch its displays. */
  96                 if (m->lid_switch_ignore_event_source) {
  97                         log_debug("Ignoring lid switch request, system startup or resume too close.");
  98                         return 0;
  99                 }
 100         }
 101
 102         /* If the key handling is inhibited, don't do anything */
 103         if (inhibit_key > 0) {
 104                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0, NULL)) {
 105                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
 106                         return 0;
 107                 }
 108         }
 109
 110         /* Locking is handled differently from the rest. */
 111         if (handle == HANDLE_LOCK) {
 112
 113                 if (!is_edge)
 114                         return 0;
 115
 116                 log_info("Locking sessions...");
 117                 session_send_lock_all(m, true);
 118                 return 1;
 119         }
 120
 121         if (handle == HANDLE_SUSPEND)
 122                 supported = can_sleep("suspend") > 0;
 123         else if (handle == HANDLE_HIBERNATE)
 124                 supported = can_sleep("hibernate") > 0;
 125         else if (handle == HANDLE_HYBRID_SLEEP)
 126                 supported = can_sleep("hybrid-sleep") > 0;
 127         else if (handle == HANDLE_KEXEC)
 128                 supported = access(KEXEC, X_OK) >= 0;
 129         else
 130                 supported = true;
 131
 132         if (!supported) {
 133                 log_warning("Requested operation not supported, ignoring.");
 134                 return -ENOTSUP;
 135         }
 136
 137         if (m->action_what) {
 138                 log_debug("Action already in progress, ignoring.");
 139                 return -EALREADY;
 140         }
 141
 142         inhibit_operation = handle == HANDLE_SUSPEND || handle == HANDLE_HIBERNATE || handle == HANDLE_HYBRID_SLEEP ? INHIBIT_SLEEP : INHIBIT_SHUTDOWN;
 143
 144         /* If the actual operation is inhibited, warn and fail */
 145         if (!ignore_inhibited &&
 146             manager_is_inhibited(m, inhibit_operation, INHIBIT_BLOCK, NULL, false, false, 0, &offending)) {
 147                 _cleanup_free_ char *comm = NULL, *u = NULL;
 148
 149                 get_process_comm(offending->pid, &comm);
 150                 u = uid_to_name(offending->uid);
 151
 152                 /* If this is just a recheck of the lid switch then don't warn about anything */
 153                 if (!is_edge) {
 154                         log_debug("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 155                                   inhibit_what_to_string(inhibit_operation),
 156                                   offending->uid, strna(u),
 157                                   offending->pid, strna(comm));
 158                         return 0;
 159                 }
 160
 161                 log_error("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 162                           inhibit_what_to_string(inhibit_operation),
 163                           offending->uid, strna(u),
 164                           offending->pid, strna(comm));
 165
 166                 warn_melody();
 167                 return -EPERM;
 168         }
 169
 170         log_info("%s", message_table[handle]);
 171
 172         r = bus_manager_shutdown_or_sleep_now_or_later(m, target_table[handle], inhibit_operation, &error);
 173         if (r < 0) {
 174                 log_error("Failed to execute operation: %s", bus_error_message(&error, r));
 175                 return r;
 176         }
 177
 178         return 1;
 179 }
 180
 181 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 182         [HANDLE_IGNORE] = "ignore",
 183         [HANDLE_POWEROFF] = "poweroff",
 184         [HANDLE_REBOOT] = "reboot",
 185         [HANDLE_HALT] = "halt",
 186         [HANDLE_KEXEC] = "kexec",
 187         [HANDLE_SUSPEND] = "suspend",
 188         [HANDLE_HIBERNATE] = "hibernate",
 189         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 190         [HANDLE_LOCK] = "lock"
 191 };
 192
 193 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 194 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");