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 or no displays connected,
  83                  * don't react to lid closing. The no display case we
  84                  * treat like this under the assumption that there is
  85                  * no modern drm driver available. */
  86                 n = manager_count_displays(m);
  87                 if (n < 0)
  88                         log_warning("Display counting failed: %s", strerror(-n));
  89                 else if (n != 1) {
  90                         log_debug("Ignoring lid switch request, %i displays connected.", n);
  91                         return 0;
  92                 }
  93
  94                 /* If the last system suspend or startup is too close,
  95                  * let's not suspend for now, to give USB docking
  96                  * stations some time to settle so that we can
  97                  * properly watch its displays. */
  98                 if (m->lid_switch_ignore_event_source) {
  99                         log_debug("Ignoring lid switch request, system startup or resume too close.");
 100                         return 0;
 101                 }
 102         }
 103
 104         /* If the key handling is inhibited, don't do anything */
 105         if (inhibit_key > 0) {
 106                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0, NULL)) {
 107                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
 108                         return 0;
 109                 }
 110         }
 111
 112         /* Locking is handled differently from the rest. */
 113         if (handle == HANDLE_LOCK) {
 114
 115                 if (!is_edge)
 116                         return 0;
 117
 118                 log_info("Locking sessions...");
 119                 session_send_lock_all(m, true);
 120                 return 1;
 121         }
 122
 123         if (handle == HANDLE_SUSPEND)
 124                 supported = can_sleep("suspend") > 0;
 125         else if (handle == HANDLE_HIBERNATE)
 126                 supported = can_sleep("hibernate") > 0;
 127         else if (handle == HANDLE_HYBRID_SLEEP)
 128                 supported = can_sleep("hybrid-sleep") > 0;
 129         else if (handle == HANDLE_KEXEC)
 130                 supported = access(KEXEC, X_OK) >= 0;
 131         else
 132                 supported = true;
 133
 134         if (!supported) {
 135                 log_warning("Requested operation not supported, ignoring.");
 136                 return -ENOTSUP;
 137         }
 138
 139         if (m->action_what) {
 140                 log_debug("Action already in progress, ignoring.");
 141                 return -EALREADY;
 142         }
 143
 144         inhibit_operation = handle == HANDLE_SUSPEND || handle == HANDLE_HIBERNATE || handle == HANDLE_HYBRID_SLEEP ? INHIBIT_SLEEP : INHIBIT_SHUTDOWN;
 145
 146         /* If the actual operation is inhibited, warn and fail */
 147         if (!ignore_inhibited &&
 148             manager_is_inhibited(m, inhibit_operation, INHIBIT_BLOCK, NULL, false, false, 0, &offending)) {
 149                 _cleanup_free_ char *comm = NULL, *u = NULL;
 150
 151                 get_process_comm(offending->pid, &comm);
 152                 u = uid_to_name(offending->uid);
 153
 154                 /* If this is just a recheck of the lid switch then don't warn about anything */
 155                 if (!is_edge) {
 156                         log_debug("Refusing operation, %s is inhibited by UID %lu/%s, PID %lu/%s.",
 157                                   inhibit_what_to_string(inhibit_operation),
 158                                   (unsigned long) offending->uid, strna(u),
 159                                   (unsigned long) offending->pid, strna(comm));
 160                         return 0;
 161                 }
 162
 163                 log_error("Refusing operation, %s is inhibited by UID %lu/%s, PID %lu/%s.",
 164                           inhibit_what_to_string(inhibit_operation),
 165                           (unsigned long) offending->uid, strna(u),
 166                           (unsigned long) offending->pid, strna(comm));
 167
 168                 warn_melody();
 169                 return -EPERM;
 170         }
 171
 172         log_info("%s", message_table[handle]);
 173
 174         r = bus_manager_shutdown_or_sleep_now_or_later(m, target_table[handle], inhibit_operation, &error);
 175         if (r < 0) {
 176                 log_error("Failed to execute operation: %s", bus_error_message(&error, r));
 177                 return r;
 178         }
 179
 180         return 1;
 181 }
 182
 183 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 184         [HANDLE_IGNORE] = "ignore",
 185         [HANDLE_POWEROFF] = "poweroff",
 186         [HANDLE_REBOOT] = "reboot",
 187         [HANDLE_HALT] = "halt",
 188         [HANDLE_KEXEC] = "kexec",
 189         [HANDLE_SUSPEND] = "suspend",
 190         [HANDLE_HIBERNATE] = "hibernate",
 191         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 192         [HANDLE_LOCK] = "lock"
 193 };
 194
 195 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 196 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");