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 /// Additional includes needed by elogind
  22 #include "fd-util.h"
  23 #include "fileio.h"
  24 #include "sd-messages.h"
  25 #include "strv.h"
  26 const char* manager_target_for_action(HandleAction handle) {
  27         static const char * const target_table[_HANDLE_ACTION_MAX] = {
  28                 [HANDLE_POWEROFF] = SPECIAL_POWEROFF_TARGET,
  29                 [HANDLE_REBOOT] = SPECIAL_REBOOT_TARGET,
  30                 [HANDLE_HALT] = SPECIAL_HALT_TARGET,
  31                 [HANDLE_KEXEC] = SPECIAL_KEXEC_TARGET,
  32                 [HANDLE_SUSPEND] = SPECIAL_SUSPEND_TARGET,
  33                 [HANDLE_HIBERNATE] = SPECIAL_HIBERNATE_TARGET,
  34                 [HANDLE_HYBRID_SLEEP] = SPECIAL_HYBRID_SLEEP_TARGET,
  35                 [HANDLE_SUSPEND_THEN_HIBERNATE] = SPECIAL_SUSPEND_THEN_HIBERNATE_TARGET,
  36         };
  37
  38         assert(handle >= 0);
  39         if (handle < (ssize_t) ELEMENTSOF(target_table))
  40                 return target_table[handle];
  41         return NULL;
  42 }
  43
  44 int manager_handle_action(
  45                 Manager *m,
  46                 InhibitWhat inhibit_key,
  47                 HandleAction handle,
  48                 bool ignore_inhibited,
  49                 bool is_edge) {
  50
  51         static const char * const message_table[_HANDLE_ACTION_MAX] = {
  52                 [HANDLE_POWEROFF] = "Powering Off...",
  53                 [HANDLE_REBOOT] = "Rebooting...",
  54                 [HANDLE_HALT] = "Halting...",
  55                 [HANDLE_KEXEC] = "Rebooting via kexec...",
  56                 [HANDLE_SUSPEND] = "Suspending...",
  57                 [HANDLE_HIBERNATE] = "Hibernating...",
  58                 [HANDLE_HYBRID_SLEEP] = "Hibernating and suspending...",
  59                 [HANDLE_SUSPEND_THEN_HIBERNATE] = "Suspending, then hibernating...",
  60         };
  61
  62 #if 0 /// elogind does this itself. No target table required
  63 #endif // 0
  64         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
  65         InhibitWhat inhibit_operation;
  66         Inhibitor *offending = NULL;
  67         bool supported;
  68         const char *target;
  69         int r;
  70
  71         assert(m);
  72
  73         /* If the key handling is turned off, don't do anything */
  74         if (handle == HANDLE_IGNORE) {
  75                 log_debug("Refusing operation, as it is turned off.");
  76                 return 0;
  77         }
  78
  79         if (inhibit_key == INHIBIT_HANDLE_LID_SWITCH) {
  80                 /* If the last system suspend or startup is too close,
  81                  * let's not suspend for now, to give USB docking
  82                  * stations some time to settle so that we can
  83                  * properly watch its displays. */
  84                 if (m->lid_switch_ignore_event_source) {
  85                         log_debug("Ignoring lid switch request, system startup or resume too close.");
  86                         return 0;
  87                 }
  88         }
  89
  90         /* If the key handling is inhibited, don't do anything */
  91         if (inhibit_key > 0) {
  92                 if (manager_is_inhibited(m, inhibit_key, INHIBIT_BLOCK, NULL, true, false, 0, NULL)) {
  93                         log_debug("Refusing operation, %s is inhibited.", inhibit_what_to_string(inhibit_key));
  94                         return 0;
  95                 }
  96         }
  97
  98         /* Locking is handled differently from the rest. */
  99         if (handle == HANDLE_LOCK) {
 100                 if (!is_edge)
 101                         return 0;
 102
 103                 log_info("Locking sessions...");
 104                 session_send_lock_all(m, true);
 105                 return 1;
 106         }
 107
 108 #if 0 /// elogind needs its own can_sleep() variant.
 109         if (handle == HANDLE_SUSPEND)
 110                 supported = can_sleep("suspend") > 0;
 111         else if (handle == HANDLE_HIBERNATE)
 112                 supported = can_sleep("hibernate") > 0;
 113         else if (handle == HANDLE_HYBRID_SLEEP)
 114                 supported = can_sleep("hybrid-sleep") > 0;
 115         else if (handle == HANDLE_SUSPEND_THEN_HIBERNATE)
 116                 supported = can_sleep("suspend-then-hibernate") > 0;
 117 #else
 118         if (handle == HANDLE_SUSPEND)
 119                 supported = can_sleep(m, "suspend") > 0;
 120         else if (handle == HANDLE_HIBERNATE)
 121                 supported = can_sleep(m, "hibernate") > 0;
 122         else if (handle == HANDLE_HYBRID_SLEEP)
 123                 supported = can_sleep(m, "hybrid-sleep") > 0;
 124 #endif // 0
 125         else if (handle == HANDLE_KEXEC)
 126                 supported = access(KEXEC, X_OK) >= 0;
 127         else
 128                 supported = true;
 129
 130         if (!supported) {
 131                 log_warning("Requested operation not supported, ignoring.");
 132                 return -EOPNOTSUPP;
 133         }
 134
 135         if (m->action_what) {
 136                 log_debug("Action already in progress, ignoring.");
 137                 return -EALREADY;
 138         }
 139
 140         assert_se(target = manager_target_for_action(handle));
 141
 142         inhibit_operation = IN_SET(handle, HANDLE_SUSPEND, HANDLE_HIBERNATE,
 143                                            HANDLE_HYBRID_SLEEP,
 144                                            HANDLE_SUSPEND_THEN_HIBERNATE) ? INHIBIT_SLEEP : INHIBIT_SHUTDOWN;
 145
 146         /* If the actual operation is inhibited, warn and fail */
 147         if (!ignore_inhibited &&
 148             manager_is_inhibited(m, inhibit_operation, INHIBIT_BLOCK, NULL, false, false, 0, &offending)) {
 149                 _cleanup_free_ char *comm = NULL, *u = NULL;
 150
 151                 get_process_comm(offending->pid, &comm);
 152                 u = uid_to_name(offending->uid);
 153
 154                 /* If this is just a recheck of the lid switch then don't warn about anything */
 155                 if (!is_edge) {
 156                         log_debug("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 157                                   inhibit_what_to_string(inhibit_operation),
 158                                   offending->uid, strna(u),
 159                                   offending->pid, strna(comm));
 160                         return 0;
 161                 }
 162
 163                 log_error("Refusing operation, %s is inhibited by UID "UID_FMT"/%s, PID "PID_FMT"/%s.",
 164                           inhibit_what_to_string(inhibit_operation),
 165                           offending->uid, strna(u),
 166                           offending->pid, strna(comm));
 167
 168                 return -EPERM;
 169         }
 170
 171         log_info("%s", message_table[handle]);
 172
 173 #if 0 /// elogind uses its own variant, which can use the handle directly.
 174         r = bus_manager_shutdown_or_sleep_now_or_later(m, target, inhibit_operation, &error);
 175 #else
 176         r = bus_manager_shutdown_or_sleep_now_or_later(m, handle, inhibit_operation, &error);
 177 #endif // 0
 178         if (r < 0) {
 179                 log_error("Failed to execute operation: %s", bus_error_message(&error, r));
 180                 return r;
 181         }
 182
 183         return 1;
 184 }
 185
 186 static const char* const handle_action_table[_HANDLE_ACTION_MAX] = {
 187         [HANDLE_IGNORE] = "ignore",
 188         [HANDLE_POWEROFF] = "poweroff",
 189         [HANDLE_REBOOT] = "reboot",
 190         [HANDLE_HALT] = "halt",
 191         [HANDLE_KEXEC] = "kexec",
 192         [HANDLE_SUSPEND] = "suspend",
 193         [HANDLE_HIBERNATE] = "hibernate",
 194         [HANDLE_HYBRID_SLEEP] = "hybrid-sleep",
 195         [HANDLE_SUSPEND_THEN_HIBERNATE] = "suspend-then-hibernate",
 196         [HANDLE_LOCK] = "lock",
 197 };
 198
 199 DEFINE_STRING_TABLE_LOOKUP(handle_action, HandleAction);
 200 DEFINE_CONFIG_PARSE_ENUM(config_parse_handle_action, handle_action, HandleAction, "Failed to parse handle action setting");