src/login/logind-action.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <unistd.h>
   4
   5 #include "alloc-util.h"
   6 #include "bus-error.h"
   7 #include "bus-util.h"
   8 #include "conf-parser.h"
   9 #include "format-util.h"
  10 #include "logind-action.h"
  11 #include "logind-dbus.h"
  12 #include "logind-session-dbus.h"
  13 #include "process-util.h"
  14 #include "sleep-config.h"
  15 #include "special.h"
  16 #include "string-table.h"
  17 #include "terminal-util.h"
  18 #include "user-util.h"
  19
  20 const char* manager_target_for_action(HandleAction handle) {
  21         static const char * const target_table[_HANDLE_ACTION_MAX] = {
  22                 [HANDLE_POWEROFF] = SPECIAL_POWEROFF_TARGET,
  23                 [HANDLE_REBOOT] = SPECIAL_REBOOT_TARGET,
  24                 [HANDLE_HALT] = SPECIAL_HALT_TARGET,
  25                 [HANDLE_KEXEC] = SPECIAL_KEXEC_TARGET,
  26                 [HANDLE_SUSPEND] = SPECIAL_SUSPEND_TARGET,
  27                 [HANDLE_HIBERNATE] = SPECIAL_HIBERNATE_TARGET,
  28                 [HANDLE_HYBRID_SLEEP] = SPECIAL_HYBRID_SLEEP_TARGET,
  29                 [HANDLE_SUSPEND_THEN_HIBERNATE] = SPECIAL_SUSPEND_THEN_HIBERNATE_TARGET,
  30         };
  31
  32         assert(handle >= 0);
  33         if (handle < (ssize_t) ELEMENTSOF(target_table))
  34                 return target_table[handle];
  35         return NULL;
  36 }
  37
  38 int manager_handle_action(
  39                 Manager *m,
  40                 InhibitWhat inhibit_key,
  41                 HandleAction handle,
  42                 bool ignore_inhibited,
  43                 bool is_edge) {
  44
  45         static const char * const message_table[_HANDLE_ACTION_MAX] = {
  46                 [HANDLE_POWEROFF] = "Powering Off...",
  47                 [HANDLE_REBOOT] = "Rebooting...",
  48                 [HANDLE_HALT] = "Halting...",
  49                 [HANDLE_KEXEC] = "Rebooting via kexec...",
  50                 [HANDLE_SUSPEND] = "Suspending...",
  51                 [HANDLE_HIBERNATE] = "Hibernating...",
  52                 [HANDLE_HYBRID_SLEEP] = "Hibernating and suspending...",
  53                 [HANDLE_SUSPEND_THEN_HIBERNATE] = "Suspending, then hibernating...",
  54         };
  55
  56         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
  57         InhibitWhat inhibit_operation;
  58         Inhibitor *offending = NULL;
  59         bool supported;
  60         const char *target;
  61         int r;
  62
  63         assert(m);
  64
  65         /* If the key handling is turned off, don't do anything */
  66         if (handle == HANDLE_IGNORE) {
  67                 log_debug("Refusing operation, as it is turned off.");
  68                 return 0;
  69         }
  70
  71         if (inhibit_key == INHIBIT_HANDLE_LID_SWITCH) {
  72                 /* If the last system suspend or startup is too close,
  73                  * let's not suspend for now, to give USB docking
  74                  * stations some time to settle so that we can
  75                  * properly watch its displays. */
  76                 if (m->lid_switch_ignore_event_source) {
  77                         log_debug("Ignoring lid switch request, system startup or resume too close.");
  78                         return 0;
  79                 }
  80         }
  81
  82         /* If the key handling is inhibited, don't do anything */
  83         if (inhibit_key > 0) {
  84                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0, NULL)) {
  85                         log_debug("Refusing %s operation, %s is inhibited.",
  86                                   handle_action_to_string(handle),
  87                                   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                 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_SUSPEND_THEN_HIBERNATE)
 109                 supported = can_sleep("suspend-then-hibernate") > 0;
 110         else if (handle == HANDLE_KEXEC)
 111                 supported = access(KEXEC, X_OK) >= 0;
 112         else
 113                 supported = true;
 114
 115         if (!supported && IN_SET(handle, HANDLE_HIBERNATE, HANDLE_HYBRID_SLEEP, HANDLE_SUSPEND_THEN_HIBERNATE)) {
 116                 supported = can_sleep("suspend") > 0;
 117                 if (supported) {
 118                         log_notice("Requested %s operation is not supported, using regular suspend instead.",
 119                                    handle_action_to_string(handle));
 120                         handle = HANDLE_SUSPEND;
 121                 }
 122         }
 123
 124         if (!supported)
 125                 return log_warning_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
 126                                          "Requested %s operation not supported, ignoring.", handle_action_to_string(handle));
 127
 128         if (m->action_what > 0)
 129                 return log_debug_errno(SYNTHETIC_ERRNO(EALREADY),
 130                                        "Action already in progress (%s), ignoring requested %s operation.",
 131                                        inhibit_what_to_string(m->action_what),
 132                                        handle_action_to_string(handle));
 133
 134         assert_se(target = manager_target_for_action(handle));
 135
 136         inhibit_operation = IN_SET(handle, HANDLE_SUSPEND, HANDLE_HIBERNATE,
 137                                            HANDLE_HYBRID_SLEEP,
 138                                            HANDLE_SUSPEND_THEN_HIBERNATE) ? INHIBIT_SLEEP : INHIBIT_SHUTDOWN;
 139
 140         /* If the actual operation is inhibited, warn and fail */
 141         if (!ignore_inhibited &&
 142             manager_is_inhibited(m, inhibit_operation, INHIBIT_BLOCK, NULL, false, false, 0, &offending)) {
 143                 _cleanup_free_ char *comm = NULL, *u = NULL;
 144
 145                 (void) get_process_comm(offending->pid, &comm);
 146                 u = uid_to_name(offending->uid);
 147
 148                 /* If this is just a recheck of the lid switch then don't warn about anything */
 149                 log_full(is_edge ? LOG_ERR : LOG_DEBUG,
 150                          "Refusing %s operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 151                          handle_action_to_string(handle),
 152                          inhibit_what_to_string(inhibit_operation),
 153                          offending->uid, strna(u),
 154                          offending->pid, strna(comm));
 155
 156                 return is_edge ? -EPERM : 0;
 157         }
 158
 159         log_info("%s", message_table[handle]);
 160
 161         r = bus_manager_shutdown_or_sleep_now_or_later(m, target, inhibit_operation, &error);
 162         if (r < 0)
 163                 return log_error_errno(r, "Failed to execute %s operation: %s",
 164                                        handle_action_to_string(handle),
 165                                        bus_error_message(&error, r));
 166
 167         return 1;
 168 }
 169
 170 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 171         [HANDLE_IGNORE] = "ignore",
 172         [HANDLE_POWEROFF] = "poweroff",
 173         [HANDLE_REBOOT] = "reboot",
 174         [HANDLE_HALT] = "halt",
 175         [HANDLE_KEXEC] = "kexec",
 176         [HANDLE_SUSPEND] = "suspend",
 177         [HANDLE_HIBERNATE] = "hibernate",
 178         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 179         [HANDLE_SUSPEND_THEN_HIBERNATE] = "suspend-then-hibernate",
 180         [HANDLE_LOCK] = "lock",
 181 };
 182
 183 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 184 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");