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