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