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