src/login/logind-action.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2012 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <unistd.h>
  21
  22 #include "alloc-util.h"
  23 #include "bus-error.h"
  24 #include "bus-util.h"
  25 #include "conf-parser.h"
  26 #include "formats-util.h"
  27 #include "logind-action.h"
  28 #include "process-util.h"
  29 #include "sleep-config.h"
  30 //#include "special.h"
  31 #include "string-table.h"
  32 #include "terminal-util.h"
  33 #include "user-util.h"
  34
  35 /// Additional includes needed by elogind
  36 #include "fd-util.h"
  37 #include "fileio.h"
  38 #include "sd-messages.h"
  39 #include "strv.h"
  40
  41 int manager_handle_action(
  42                 Manager *m,
  43                 InhibitWhat inhibit_key,
  44                 HandleAction handle,
  45                 bool ignore_inhibited,
  46                 bool is_edge) {
  47
  48         static const char * const message_table[_HANDLE_ACTION_MAX] = {
  49                 [HANDLE_POWEROFF] = "Powering Off...",
  50                 [HANDLE_REBOOT] = "Rebooting...",
  51                 [HANDLE_HALT] = "Halting...",
  52                 [HANDLE_KEXEC] = "Rebooting via kexec...",
  53                 [HANDLE_SUSPEND] = "Suspending...",
  54                 [HANDLE_HIBERNATE] = "Hibernating...",
  55                 [HANDLE_HYBRID_SLEEP] = "Hibernating and suspending..."
  56         };
  57
  58 #if 0 /// elogind does this itself. No target table required
  59         static const char * const target_table[_HANDLE_ACTION_MAX] = {
  60                 [HANDLE_POWEROFF] = SPECIAL_POWEROFF_TARGET,
  61                 [HANDLE_REBOOT] = SPECIAL_REBOOT_TARGET,
  62                 [HANDLE_HALT] = SPECIAL_HALT_TARGET,
  63                 [HANDLE_KEXEC] = SPECIAL_KEXEC_TARGET,
  64                 [HANDLE_SUSPEND] = SPECIAL_SUSPEND_TARGET,
  65                 [HANDLE_HIBERNATE] = SPECIAL_HIBERNATE_TARGET,
  66                 [HANDLE_HYBRID_SLEEP] = SPECIAL_HYBRID_SLEEP_TARGET
  67         };
  68 #endif // 0
  69
  70         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
  71         InhibitWhat inhibit_operation;
  72         Inhibitor *offending = NULL;
  73         bool supported;
  74         int r;
  75
  76         assert(m);
  77
  78         /* If the key handling is turned off, don't do anything */
  79         if (handle == HANDLE_IGNORE) {
  80                 log_debug("Refusing operation, as it is turned off.");
  81                 return 0;
  82         }
  83
  84         if (inhibit_key == INHIBIT_HANDLE_LID_SWITCH) {
  85                 /* If the last system suspend or startup is too close,
  86                  * let's not suspend for now, to give USB docking
  87                  * stations some time to settle so that we can
  88                  * properly watch its displays. */
  89                 if (m->lid_switch_ignore_event_source) {
  90                         log_debug("Ignoring lid switch request, system startup or resume too close.");
  91                         return 0;
  92                 }
  93         }
  94
  95         /* If the key handling is inhibited, don't do anything */
  96         if (inhibit_key > 0) {
  97                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0, NULL)) {
  98                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
  99                         return 0;
 100                 }
 101         }
 102
 103         /* Locking is handled differently from the rest. */
 104         if (handle == HANDLE_LOCK) {
 105
 106                 if (!is_edge)
 107                         return 0;
 108
 109                 log_info("Locking sessions...");
 110                 session_send_lock_all(m, true);
 111                 return 1;
 112         }
 113
 114 #if 0 /// elogind needs its own can_sleep() variant.
 115         if (handle == HANDLE_SUSPEND)
 116                 supported = can_sleep("suspend") > 0;
 117         else if (handle == HANDLE_HIBERNATE)
 118                 supported = can_sleep("hibernate") > 0;
 119         else if (handle == HANDLE_HYBRID_SLEEP)
 120                 supported = can_sleep("hybrid-sleep") > 0;
 121 #else
 122         if (handle == HANDLE_SUSPEND)
 123                 supported = can_sleep(m, "suspend") > 0;
 124         else if (handle == HANDLE_HIBERNATE)
 125                 supported = can_sleep(m, "hibernate") > 0;
 126         else if (handle == HANDLE_HYBRID_SLEEP)
 127                 supported = can_sleep(m, "hybrid-sleep") > 0;
 128 #endif // 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 -EOPNOTSUPP;
 137         }
 138
 139         if (m->action_what) {
 140                 log_debug("Action already in progress, ignoring.");
 141                 return -EALREADY;
 142         }
 143
 144         inhibit_operation = IN_SET(handle, HANDLE_SUSPEND, HANDLE_HIBERNATE, 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 "UID_FMT"/%s, PID "PID_FMT"/%s.",
 157                                   inhibit_what_to_string(inhibit_operation),
 158                                   offending->uid, strna(u),
 159                                   offending->pid, strna(comm));
 160                         return 0;
 161                 }
 162
 163                 log_error("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 164                           inhibit_what_to_string(inhibit_operation),
 165                           offending->uid, strna(u),
 166                           offending->pid, strna(comm));
 167
 168                 return -EPERM;
 169         }
 170
 171         log_info("%s", message_table[handle]);
 172
 173 #if 0 /// elogind uses its own variant, which can use the handle directly.
 174         r = bus_manager_shutdown_or_sleep_now_or_later(m, target_table[handle], inhibit_operation, &error);
 175 #else
 176         r = bus_manager_shutdown_or_sleep_now_or_later(m, handle, inhibit_operation, &error);
 177 #endif // 0
 178         if (r < 0) {
 179                 log_error("Failed to execute operation: %s", bus_error_message(&error, r));
 180                 return r;
 181         }
 182
 183         return 1;
 184 }
 185
 186 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 187         [HANDLE_IGNORE] = "ignore",
 188         [HANDLE_POWEROFF] = "poweroff",
 189         [HANDLE_REBOOT] = "reboot",
 190         [HANDLE_HALT] = "halt",
 191         [HANDLE_KEXEC] = "kexec",
 192         [HANDLE_SUSPEND] = "suspend",
 193         [HANDLE_HIBERNATE] = "hibernate",
 194         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 195         [HANDLE_LOCK] = "lock"
 196 };
 197
 198 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 199 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");