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 operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
  86                         return 0;
  87                 }
  88         }
  89
  90         /* Locking is handled differently from the rest. */
  91         if (handle == HANDLE_LOCK) {
  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_SUSPEND_THEN_HIBERNATE)
 107                 supported = can_sleep("suspend-then-hibernate") > 0;
 108         else if (handle == HANDLE_KEXEC)
 109                 supported = access(KEXEC, X_OK) >= 0;
 110         else
 111                 supported = true;
 112
 113         if (!supported && IN_SET(handle, HANDLE_HIBERNATE, HANDLE_HYBRID_SLEEP, HANDLE_SUSPEND_THEN_HIBERNATE)) {
 114                 supported = can_sleep("suspend") > 0;
 115                 if (supported) {
 116                         log_notice("Operation '%s' requested but not supported, using regular suspend instead.", handle_action_to_string(handle));
 117                         handle = HANDLE_SUSPEND;
 118                 }
 119         }
 120
 121         if (!supported) {
 122                 log_warning("Requested operation not supported, ignoring.");
 123                 return -EOPNOTSUPP;
 124         }
 125
 126         if (m->action_what > 0) {
 127                 log_debug("Action already in progress, ignoring.");
 128                 return -EALREADY;
 129         }
 130
 131         assert_se(target = manager_target_for_action(handle));
 132
 133         inhibit_operation = IN_SET(handle, HANDLE_SUSPEND, HANDLE_HIBERNATE,
 134                                            HANDLE_HYBRID_SLEEP,
 135                                            HANDLE_SUSPEND_THEN_HIBERNATE) ? INHIBIT_SLEEP : INHIBIT_SHUTDOWN;
 136
 137         /* If the actual operation is inhibited, warn and fail */
 138         if (!ignore_inhibited &&
 139             manager_is_inhibited(m, inhibit_operation, INHIBIT_BLOCK, NULL, false, false, 0, &offending)) {
 140                 _cleanup_free_ char *comm = NULL, *u = NULL;
 141
 142                 (void) get_process_comm(offending->pid, &comm);
 143                 u = uid_to_name(offending->uid);
 144
 145                 /* If this is just a recheck of the lid switch then don't warn about anything */
 146                 if (!is_edge) {
 147                         log_debug("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 148                                   inhibit_what_to_string(inhibit_operation),
 149                                   offending->uid, strna(u),
 150                                   offending->pid, strna(comm));
 151                         return 0;
 152                 }
 153
 154                 log_error("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 155                           inhibit_what_to_string(inhibit_operation),
 156                           offending->uid, strna(u),
 157                           offending->pid, strna(comm));
 158
 159                 return -EPERM;
 160         }
 161
 162         log_info("%s", message_table[handle]);
 163
 164         r = bus_manager_shutdown_or_sleep_now_or_later(m, target, inhibit_operation, &error);
 165         if (r < 0)
 166                 return log_error_errno(r, "Failed to execute operation: %s", bus_error_message(&error, r));
 167
 168         return 1;
 169 }
 170
 171 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 172         [HANDLE_IGNORE] = "ignore",
 173         [HANDLE_POWEROFF] = "poweroff",
 174         [HANDLE_REBOOT] = "reboot",
 175         [HANDLE_HALT] = "halt",
 176         [HANDLE_KEXEC] = "kexec",
 177         [HANDLE_SUSPEND] = "suspend",
 178         [HANDLE_HIBERNATE] = "hibernate",
 179         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 180         [HANDLE_SUSPEND_THEN_HIBERNATE] = "suspend-then-hibernate",
 181         [HANDLE_LOCK] = "lock",
 182 };
 183
 184 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 185 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");