src/login/logind-action.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2012 Lennart Poettering
   6 ***/
   7
   8 #include <unistd.h>
   9
  10 #include "alloc-util.h"
  11 #include "bus-error.h"
  12 #include "bus-util.h"
  13 #include "conf-parser.h"
  14 #include "format-util.h"
  15 #include "logind-action.h"
  16 #include "process-util.h"
  17 #include "sleep-config.h"
  18 //#include "special.h"
  19 #include "string-table.h"
  20 #include "terminal-util.h"
  21 #include "user-util.h"
  22
  23 /// Additional includes needed by elogind
  24 #include "fd-util.h"
  25 #include "fileio.h"
  26 #include "sd-messages.h"
  27 #include "strv.h"
  28
  29 int manager_handle_action(
  30                 Manager *m,
  31                 InhibitWhat inhibit_key,
  32                 HandleAction handle,
  33                 bool ignore_inhibited,
  34                 bool is_edge) {
  35
  36         static const char * const message_table[_HANDLE_ACTION_MAX] = {
  37                 [HANDLE_POWEROFF] = "Powering Off...",
  38                 [HANDLE_REBOOT] = "Rebooting...",
  39                 [HANDLE_HALT] = "Halting...",
  40                 [HANDLE_KEXEC] = "Rebooting via kexec...",
  41                 [HANDLE_SUSPEND] = "Suspending...",
  42                 [HANDLE_HIBERNATE] = "Hibernating...",
  43                 [HANDLE_HYBRID_SLEEP] = "Hibernating and suspending...",
  44                 [HANDLE_SUSPEND_THEN_HIBERNATE] = "Suspending, then hibernating...",
  45         };
  46
  47 #if 0 /// elogind does this itself. No target table required
  48         static const char * const target_table[_HANDLE_ACTION_MAX] = {
  49                 [HANDLE_POWEROFF] = SPECIAL_POWEROFF_TARGET,
  50                 [HANDLE_REBOOT] = SPECIAL_REBOOT_TARGET,
  51                 [HANDLE_HALT] = SPECIAL_HALT_TARGET,
  52                 [HANDLE_KEXEC] = SPECIAL_KEXEC_TARGET,
  53                 [HANDLE_SUSPEND] = SPECIAL_SUSPEND_TARGET,
  54                 [HANDLE_HIBERNATE] = SPECIAL_HIBERNATE_TARGET,
  55                 [HANDLE_HYBRID_SLEEP] = SPECIAL_HYBRID_SLEEP_TARGET,
  56                 [HANDLE_SUSPEND_THEN_HIBERNATE] = SPECIAL_SUSPEND_THEN_HIBERNATE_TARGET,
  57         };
  58 #endif // 0
  59
  60         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
  61         InhibitWhat inhibit_operation;
  62         Inhibitor *offending = NULL;
  63         bool supported;
  64         int r;
  65
  66         assert(m);
  67
  68         /* If the key handling is turned off, don't do anything */
  69         if (handle == HANDLE_IGNORE) {
  70                 log_debug("Refusing operation, as it is turned off.");
  71                 return 0;
  72         }
  73
  74         if (inhibit_key == INHIBIT_HANDLE_LID_SWITCH) {
  75                 /* If the last system suspend or startup is too close,
  76                  * let's not suspend for now, to give USB docking
  77                  * stations some time to settle so that we can
  78                  * properly watch its displays. */
  79                 if (m->lid_switch_ignore_event_source) {
  80                         log_debug("Ignoring lid switch request, system startup or resume too close.");
  81                         return 0;
  82                 }
  83         }
  84
  85         /* If the key handling is inhibited, don't do anything */
  86         if (inhibit_key > 0) {
  87                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0, NULL)) {
  88                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
  89                         return 0;
  90                 }
  91         }
  92
  93         /* Locking is handled differently from the rest. */
  94         if (handle == HANDLE_LOCK) {
  95
  96                 if (!is_edge)
  97                         return 0;
  98
  99                 log_info("Locking sessions...");
 100                 session_send_lock_all(m, true);
 101                 return 1;
 102         }
 103
 104 #if 0 /// elogind needs its own can_sleep() variant.
 105         if (handle == HANDLE_SUSPEND)
 106                 supported = can_sleep("suspend") > 0;
 107         else if (handle == HANDLE_HIBERNATE)
 108                 supported = can_sleep("hibernate") > 0;
 109         else if (handle == HANDLE_HYBRID_SLEEP)
 110                 supported = can_sleep("hybrid-sleep") > 0;
 111         else if (handle == HANDLE_SUSPEND_THEN_HIBERNATE)
 112                 supported = can_sleep("suspend-then-hibernate") > 0;
 113 #else
 114         if (handle == HANDLE_SUSPEND)
 115                 supported = can_sleep(m, "suspend") > 0;
 116         else if (handle == HANDLE_HIBERNATE)
 117                 supported = can_sleep(m, "hibernate") > 0;
 118         else if (handle == HANDLE_HYBRID_SLEEP)
 119                 supported = can_sleep(m, "hybrid-sleep") > 0;
 120 #endif // 0
 121         else if (handle == HANDLE_KEXEC)
 122                 supported = access(KEXEC, X_OK) >= 0;
 123         else
 124                 supported = true;
 125
 126         if (!supported) {
 127                 log_warning("Requested operation not supported, ignoring.");
 128                 return -EOPNOTSUPP;
 129         }
 130
 131         if (m->action_what) {
 132                 log_debug("Action already in progress, ignoring.");
 133                 return -EALREADY;
 134         }
 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                 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                 if (!is_edge) {
 150                         log_debug("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 151                                   inhibit_what_to_string(inhibit_operation),
 152                                   offending->uid, strna(u),
 153                                   offending->pid, strna(comm));
 154                         return 0;
 155                 }
 156
 157                 log_error("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 158                           inhibit_what_to_string(inhibit_operation),
 159                           offending->uid, strna(u),
 160                           offending->pid, strna(comm));
 161
 162                 return -EPERM;
 163         }
 164
 165         log_info("%s", message_table[handle]);
 166
 167 #if 0 /// elogind uses its own variant, which can use the handle directly.
 168         r = bus_manager_shutdown_or_sleep_now_or_later(m, target_table[handle], inhibit_operation, &error);
 169 #else
 170         r = bus_manager_shutdown_or_sleep_now_or_later(m, handle, inhibit_operation, &error);
 171 #endif // 0
 172         if (r < 0) {
 173                 log_error("Failed to execute operation: %s", bus_error_message(&error, r));
 174                 return r;
 175         }
 176
 177         return 1;
 178 }
 179
 180 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 181         [HANDLE_IGNORE] = "ignore",
 182         [HANDLE_POWEROFF] = "poweroff",
 183         [HANDLE_REBOOT] = "reboot",
 184         [HANDLE_HALT] = "halt",
 185         [HANDLE_KEXEC] = "kexec",
 186         [HANDLE_SUSPEND] = "suspend",
 187         [HANDLE_HIBERNATE] = "hibernate",
 188         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 189         [HANDLE_SUSPEND_THEN_HIBERNATE] = "suspend-then-hibernate",
 190         [HANDLE_LOCK] = "lock"
 191 };
 192
 193 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 194 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");