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 "process-util.h"
  12 #include "sleep-config.h"
  13 #include "special.h"
  14 #include "string-table.h"
  15 #include "terminal-util.h"
  16 #include "user-util.h"
  17
  18 const char* manager_target_for_action(HandleAction handle) {
  19         static const char * const target_table[_HANDLE_ACTION_MAX] = {
  20                 [HANDLE_POWEROFF] = SPECIAL_POWEROFF_TARGET,
  21                 [HANDLE_REBOOT] = SPECIAL_REBOOT_TARGET,
  22                 [HANDLE_HALT] = SPECIAL_HALT_TARGET,
  23                 [HANDLE_KEXEC] = SPECIAL_KEXEC_TARGET,
  24                 [HANDLE_SUSPEND] = SPECIAL_SUSPEND_TARGET,
  25                 [HANDLE_HIBERNATE] = SPECIAL_HIBERNATE_TARGET,
  26                 [HANDLE_HYBRID_SLEEP] = SPECIAL_HYBRID_SLEEP_TARGET,
  27                 [HANDLE_SUSPEND_THEN_HIBERNATE] = SPECIAL_SUSPEND_THEN_HIBERNATE_TARGET,
  28         };
  29
  30         assert(handle >= 0);
  31         if (handle < (ssize_t) ELEMENTSOF(target_table))
  32                 return target_table[handle];
  33         return NULL;
  34 }
  35
  36 int manager_handle_action(
  37                 Manager *m,
  38                 InhibitWhat inhibit_key,
  39                 HandleAction handle,
  40                 bool ignore_inhibited,
  41                 bool is_edge) {
  42
  43         static const char * const message_table[_HANDLE_ACTION_MAX] = {
  44                 [HANDLE_POWEROFF] = "Powering Off...",
  45                 [HANDLE_REBOOT] = "Rebooting...",
  46                 [HANDLE_HALT] = "Halting...",
  47                 [HANDLE_KEXEC] = "Rebooting via kexec...",
  48                 [HANDLE_SUSPEND] = "Suspending...",
  49                 [HANDLE_HIBERNATE] = "Hibernating...",
  50                 [HANDLE_HYBRID_SLEEP] = "Hibernating and suspending...",
  51                 [HANDLE_SUSPEND_THEN_HIBERNATE] = "Suspending, then hibernating...",
  52         };
  53
  54         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
  55         InhibitWhat inhibit_operation;
  56         Inhibitor *offending = NULL;
  57         bool supported;
  58         const char *target;
  59         int r;
  60
  61         assert(m);
  62
  63         /* If the key handling is turned off, don't do anything */
  64         if (handle == HANDLE_IGNORE) {
  65                 log_debug("Refusing operation, as it is turned off.");
  66                 return 0;
  67         }
  68
  69         if (inhibit_key == INHIBIT_HANDLE_LID_SWITCH) {
  70                 /* If the last system suspend or startup is too close,
  71                  * let's not suspend for now, to give USB docking
  72                  * stations some time to settle so that we can
  73                  * properly watch its displays. */
  74                 if (m->lid_switch_ignore_event_source) {
  75                         log_debug("Ignoring lid switch request, system startup or resume too close.");
  76                         return 0;
  77                 }
  78         }
  79
  80         /* If the key handling is inhibited, don't do anything */
  81         if (inhibit_key > 0) {
  82                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0, NULL)) {
  83                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
  84                         return 0;
  85                 }
  86         }
  87
  88         /* Locking is handled differently from the rest. */
  89         if (handle == HANDLE_LOCK) {
  90                 if (!is_edge)
  91                         return 0;
  92
  93                 log_info("Locking sessions...");
  94                 session_send_lock_all(m, true);
  95                 return 1;
  96         }
  97
  98         if (handle == HANDLE_SUSPEND)
  99                 supported = can_sleep("suspend") > 0;
 100         else if (handle == HANDLE_HIBERNATE)
 101                 supported = can_sleep("hibernate") > 0;
 102         else if (handle == HANDLE_HYBRID_SLEEP)
 103                 supported = can_sleep("hybrid-sleep") > 0;
 104         else if (handle == HANDLE_SUSPEND_THEN_HIBERNATE)
 105                 supported = can_sleep("suspend-then-hibernate") > 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 -EOPNOTSUPP;
 114         }
 115
 116         if (m->action_what) {
 117                 log_debug("Action already in progress, ignoring.");
 118                 return -EALREADY;
 119         }
 120
 121         assert_se(target = manager_target_for_action(handle));
 122
 123         inhibit_operation = IN_SET(handle, HANDLE_SUSPEND, HANDLE_HIBERNATE,
 124                                            HANDLE_HYBRID_SLEEP,
 125                                            HANDLE_SUSPEND_THEN_HIBERNATE) ? INHIBIT_SLEEP : INHIBIT_SHUTDOWN;
 126
 127         /* If the actual operation is inhibited, warn and fail */
 128         if (!ignore_inhibited &&
 129             manager_is_inhibited(m, inhibit_operation, INHIBIT_BLOCK, NULL, false, false, 0, &offending)) {
 130                 _cleanup_free_ char *comm = NULL, *u = NULL;
 131
 132                 get_process_comm(offending->pid, &comm);
 133                 u = uid_to_name(offending->uid);
 134
 135                 /* If this is just a recheck of the lid switch then don't warn about anything */
 136                 if (!is_edge) {
 137                         log_debug("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 138                                   inhibit_what_to_string(inhibit_operation),
 139                                   offending->uid, strna(u),
 140                                   offending->pid, strna(comm));
 141                         return 0;
 142                 }
 143
 144                 log_error("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 145                           inhibit_what_to_string(inhibit_operation),
 146                           offending->uid, strna(u),
 147                           offending->pid, strna(comm));
 148
 149                 return -EPERM;
 150         }
 151
 152         log_info("%s", message_table[handle]);
 153
 154         r = bus_manager_shutdown_or_sleep_now_or_later(m, target, inhibit_operation, &error);
 155         if (r < 0)
 156                 return log_error_errno(r, "Failed to execute operation: %s", bus_error_message(&error, r));
 157
 158         return 1;
 159 }
 160
 161 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 162         [HANDLE_IGNORE] = "ignore",
 163         [HANDLE_POWEROFF] = "poweroff",
 164         [HANDLE_REBOOT] = "reboot",
 165         [HANDLE_HALT] = "halt",
 166         [HANDLE_KEXEC] = "kexec",
 167         [HANDLE_SUSPEND] = "suspend",
 168         [HANDLE_HIBERNATE] = "hibernate",
 169         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 170         [HANDLE_SUSPEND_THEN_HIBERNATE] = "suspend-then-hibernate",
 171         [HANDLE_LOCK] = "lock",
 172 };
 173
 174 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 175 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");