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