src/login/logind-action.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2012 Lennart Poettering
   4 ***/
   5
   6 #include <unistd.h>
   7
   8 #include "alloc-util.h"
   9 #include "bus-error.h"
  10 #include "bus-util.h"
  11 #include "conf-parser.h"
  12 #include "format-util.h"
  13 #include "logind-action.h"
  14 #include "process-util.h"
  15 #include "sleep-config.h"
  16 #include "special.h"
  17 #include "string-table.h"
  18 #include "terminal-util.h"
  19 #include "user-util.h"
  20
  21 const char* manager_target_for_action(HandleAction handle) {
  22         static const char * const target_table[_HANDLE_ACTION_MAX] = {
  23                 [HANDLE_POWEROFF] = SPECIAL_POWEROFF_TARGET,
  24                 [HANDLE_REBOOT] = SPECIAL_REBOOT_TARGET,
  25                 [HANDLE_HALT] = SPECIAL_HALT_TARGET,
  26                 [HANDLE_KEXEC] = SPECIAL_KEXEC_TARGET,
  27                 [HANDLE_SUSPEND] = SPECIAL_SUSPEND_TARGET,
  28                 [HANDLE_HIBERNATE] = SPECIAL_HIBERNATE_TARGET,
  29                 [HANDLE_HYBRID_SLEEP] = SPECIAL_HYBRID_SLEEP_TARGET,
  30                 [HANDLE_SUSPEND_THEN_HIBERNATE] = SPECIAL_SUSPEND_THEN_HIBERNATE_TARGET,
  31         };
  32
  33         assert(handle >= 0);
  34         if (handle < (ssize_t) ELEMENTSOF(target_table))
  35                 return target_table[handle];
  36         return NULL;
  37 }
  38
  39 int manager_handle_action(
  40                 Manager *m,
  41                 InhibitWhat inhibit_key,
  42                 HandleAction handle,
  43                 bool ignore_inhibited,
  44                 bool is_edge) {
  45
  46         static const char * const message_table[_HANDLE_ACTION_MAX] = {
  47                 [HANDLE_POWEROFF] = "Powering Off...",
  48                 [HANDLE_REBOOT] = "Rebooting...",
  49                 [HANDLE_HALT] = "Halting...",
  50                 [HANDLE_KEXEC] = "Rebooting via kexec...",
  51                 [HANDLE_SUSPEND] = "Suspending...",
  52                 [HANDLE_HIBERNATE] = "Hibernating...",
  53                 [HANDLE_HYBRID_SLEEP] = "Hibernating and suspending...",
  54                 [HANDLE_SUSPEND_THEN_HIBERNATE] = "Suspending, then hibernating...",
  55         };
  56
  57         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
  58         InhibitWhat inhibit_operation;
  59         Inhibitor *offending = NULL;
  60         bool supported;
  61         const char *target;
  62         int r;
  63
  64         assert(m);
  65
  66         /* If the key handling is turned off, don't do anything */
  67         if (handle == HANDLE_IGNORE) {
  68                 log_debug("Refusing operation, as it is turned off.");
  69                 return 0;
  70         }
  71
  72         if (inhibit_key == INHIBIT_HANDLE_LID_SWITCH) {
  73                 /* If the last system suspend or startup is too close,
  74                  * let's not suspend for now, to give USB docking
  75                  * stations some time to settle so that we can
  76                  * properly watch its displays. */
  77                 if (m->lid_switch_ignore_event_source) {
  78                         log_debug("Ignoring lid switch request, system startup or resume too close.");
  79                         return 0;
  80                 }
  81         }
  82
  83         /* If the key handling is inhibited, don't do anything */
  84         if (inhibit_key > 0) {
  85                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0, NULL)) {
  86                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
  87                         return 0;
  88                 }
  89         }
  90
  91         /* Locking is handled differently from the rest. */
  92         if (handle == HANDLE_LOCK) {
  93                 if (!is_edge)
  94                         return 0;
  95
  96                 log_info("Locking sessions...");
  97                 session_send_lock_all(m, true);
  98                 return 1;
  99         }
 100
 101         if (handle == HANDLE_SUSPEND)
 102                 supported = can_sleep("suspend") > 0;
 103         else if (handle == HANDLE_HIBERNATE)
 104                 supported = can_sleep("hibernate") > 0;
 105         else if (handle == HANDLE_HYBRID_SLEEP)
 106                 supported = can_sleep("hybrid-sleep") > 0;
 107         else if (handle == HANDLE_SUSPEND_THEN_HIBERNATE)
 108                 supported = can_sleep("suspend-then-hibernate") > 0;
 109         else if (handle == HANDLE_KEXEC)
 110                 supported = access(KEXEC, X_OK) >= 0;
 111         else
 112                 supported = true;
 113
 114         if (!supported) {
 115                 log_warning("Requested operation not supported, ignoring.");
 116                 return -EOPNOTSUPP;
 117         }
 118
 119         if (m->action_what) {
 120                 log_debug("Action already in progress, ignoring.");
 121                 return -EALREADY;
 122         }
 123
 124         assert_se(target = manager_target_for_action(handle));
 125
 126         inhibit_operation = IN_SET(handle, HANDLE_SUSPEND, HANDLE_HIBERNATE,
 127                                            HANDLE_HYBRID_SLEEP,
 128                                            HANDLE_SUSPEND_THEN_HIBERNATE) ? INHIBIT_SLEEP : INHIBIT_SHUTDOWN;
 129
 130         /* If the actual operation is inhibited, warn and fail */
 131         if (!ignore_inhibited &&
 132             manager_is_inhibited(m, inhibit_operation, INHIBIT_BLOCK, NULL, false, false, 0, &offending)) {
 133                 _cleanup_free_ char *comm = NULL, *u = NULL;
 134
 135                 get_process_comm(offending->pid, &comm);
 136                 u = uid_to_name(offending->uid);
 137
 138                 /* If this is just a recheck of the lid switch then don't warn about anything */
 139                 if (!is_edge) {
 140                         log_debug("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 141                                   inhibit_what_to_string(inhibit_operation),
 142                                   offending->uid, strna(u),
 143                                   offending->pid, strna(comm));
 144                         return 0;
 145                 }
 146
 147                 log_error("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
 152                 return -EPERM;
 153         }
 154
 155         log_info("%s", message_table[handle]);
 156
 157         r = bus_manager_shutdown_or_sleep_now_or_later(m, target, inhibit_operation, &error);
 158         if (r < 0) {
 159                 log_error("Failed to execute operation: %s", bus_error_message(&error, r));
 160                 return r;
 161         }
 162
 163         return 1;
 164 }
 165
 166 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 167         [HANDLE_IGNORE] = "ignore",
 168         [HANDLE_POWEROFF] = "poweroff",
 169         [HANDLE_REBOOT] = "reboot",
 170         [HANDLE_HALT] = "halt",
 171         [HANDLE_KEXEC] = "kexec",
 172         [HANDLE_SUSPEND] = "suspend",
 173         [HANDLE_HIBERNATE] = "hibernate",
 174         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 175         [HANDLE_SUSPEND_THEN_HIBERNATE] = "suspend-then-hibernate",
 176         [HANDLE_LOCK] = "lock",
 177 };
 178
 179 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 180 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");