--- /dev/null
+/***
+ This file is part of elogind.
+
+ Copyright 2017 Sven Eden
+
+ elogind is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ elogind is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with elogind; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+
+#include "bus-error.h"
+#include "bus-util.h"
+#include "eloginctl.h"
+#include "logind-action.h"
+#include "parse-util.h"
+#include "process-util.h"
+#include "sd-login.h"
+#include "spawn-polkit-agent.h"
+#include "string-util.h"
+#include "strv.h"
+#include "terminal-util.h"
+#include "user-util.h"
+#include "virt.h"
+
+
+elogind_action arg_action = _ACTION_INVALID;
+bool arg_ask_password = true;
+bool arg_ignore_inhibitors = false;
+bool arg_no_wall = false;
+BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
+char** arg_wall = NULL;
+usec_t arg_when = 0;
+
+static const struct {
+ HandleAction action;
+ const char* verb;
+} action_table[_ACTION_MAX] = {
+ [ACTION_POWEROFF] = { HANDLE_POWEROFF, "poweroff", },
+ [ACTION_REBOOT] = { HANDLE_REBOOT, "reboot", },
+ [ACTION_SUSPEND] = { HANDLE_SUSPEND, "suspend", },
+ [ACTION_HIBERNATE] = { HANDLE_HIBERNATE, "hibernate", },
+ [ACTION_HYBRID_SLEEP] = { HANDLE_HYBRID_SLEEP, "hybrid-sleep" },
+};
+
+static int elogind_set_wall_message(sd_bus* bus, const char* msg);
+
+static enum elogind_action verb_to_action(const char *verb) {
+ enum elogind_action i;
+
+ for (i = _ACTION_INVALID; i < _ACTION_MAX; i++)
+ if (streq_ptr(action_table[i].verb, verb))
+ return i;
+
+ return _ACTION_INVALID;
+}
+
+static int check_inhibitors(sd_bus* bus, enum elogind_action a) {
+ _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+ _cleanup_strv_free_ char **sessions = NULL;
+ const char *what, *who, *why, *mode;
+ uint32_t uid, pid;
+ unsigned c = 0;
+ char **s;
+ int r;
+
+ if (arg_ignore_inhibitors)
+ return 0;
+
+ if (arg_when > 0)
+ return 0;
+
+ if (geteuid() == 0)
+ return 0;
+
+ if (!on_tty())
+ return 0;
+
+ r = sd_bus_call_method(
+ bus,
+ "org.freedesktop.login1",
+ "/org/freedesktop/login1",
+ "org.freedesktop.login1.Manager",
+ "ListInhibitors",
+ NULL,
+ &reply,
+ NULL);
+ if (r < 0)
+ /* If logind is not around, then there are no inhibitors... */
+ return 0;
+
+ r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssuu)");
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ while ((r = sd_bus_message_read(reply, "(ssssuu)", &what, &who, &why, &mode, &uid, &pid)) > 0) {
+ _cleanup_free_ char *comm = NULL, *user = NULL;
+ _cleanup_strv_free_ char **sv = NULL;
+
+ if (!streq(mode, "block"))
+ continue;
+
+ sv = strv_split(what, ":");
+ if (!sv)
+ return log_oom();
+
+ if ((pid_t) pid < 0)
+ return log_error_errno(ERANGE, "Bad PID %"PRIu32": %m", pid);
+
+ if (!strv_contains(sv,
+ IN_SET(a,
+ ACTION_HALT,
+ ACTION_POWEROFF,
+ ACTION_REBOOT,
+ ACTION_KEXEC) ? "shutdown" : "sleep"))
+ continue;
+
+ get_process_comm(pid, &comm);
+ user = uid_to_name(uid);
+
+ log_warning("Operation inhibited by \"%s\" (PID "PID_FMT" \"%s\", user %s), reason is \"%s\".",
+ who, (pid_t) pid, strna(comm), strna(user), why);
+
+ c++;
+ }
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ r = sd_bus_message_exit_container(reply);
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ /* Check for current sessions */
+ sd_get_sessions(&sessions);
+ STRV_FOREACH(s, sessions) {
+ _cleanup_free_ char *type = NULL, *tty = NULL, *seat = NULL, *user = NULL, *service = NULL, *class = NULL;
+
+ if (sd_session_get_uid(*s, &uid) < 0 || uid == getuid())
+ continue;
+
+ if (sd_session_get_class(*s, &class) < 0 || !streq(class, "user"))
+ continue;
+
+ if (sd_session_get_type(*s, &type) < 0 || (!streq(type, "x11") && !streq(type, "tty")))
+ continue;
+
+ sd_session_get_tty(*s, &tty);
+ sd_session_get_seat(*s, &seat);
+ sd_session_get_service(*s, &service);
+ user = uid_to_name(uid);
+
+ log_warning("User %s is logged in on %s.", strna(user), isempty(tty) ? (isempty(seat) ? strna(service) : seat) : tty);
+ c++;
+ }
+
+ if (c <= 0)
+ return 0;
+
+ log_error("Please retry operation after closing inhibitors and logging out other users.\nAlternatively, ignore inhibitors and users with 'loginctl -i %s'.",
+ action_table[a].verb);
+
+ return -EPERM;
+}
+
+int elogind_cancel_shutdown(sd_bus *bus) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ int r;
+
+ r = sd_bus_call_method(
+ bus,
+ "org.freedesktop.login1",
+ "/org/freedesktop/login1",
+ "org.freedesktop.login1.Manager",
+ "CancelScheduledShutdown",
+ &error,
+ NULL, NULL);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to talk to elogind, shutdown hasn't been cancelled: %s", bus_error_message(&error, r));
+
+ return 0;
+}
+
+void elogind_cleanup(void) {
+ polkit_agent_close();
+ strv_free(arg_wall);
+}
+
+static int elogind_reboot(sd_bus *bus, enum elogind_action a) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ const char *method = NULL;
+ int r;
+ static const char *table[_ACTION_MAX] = {
+ [ACTION_REBOOT] = "The system is going down for reboot NOW!",
+ [ACTION_POWEROFF] = "The system is going down for power-off NOW!"
+ };
+
+ if (!bus)
+ return -EIO;
+
+ polkit_agent_open_if_enabled();
+
+ switch (a) {
+
+ case ACTION_POWEROFF:
+ method = "PowerOff";
+ break;
+
+ case ACTION_REBOOT:
+ method = "Reboot";
+ break;
+
+ case ACTION_SUSPEND:
+ method = "Suspend";
+ break;
+
+ case ACTION_HIBERNATE:
+ method = "Hibernate";
+ break;
+
+ case ACTION_HYBRID_SLEEP:
+ method = "HybridSleep";
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ r = elogind_set_wall_message(bus, table[a]);
+
+ if (r < 0) {
+ log_warning_errno(r, "Failed to set wall message, ignoring: %s",
+ bus_error_message(&error, r));
+ sd_bus_error_free(&error);
+ }
+
+ /* Now call elogind itself to request the operation */
+ r = sd_bus_call_method(
+ bus,
+ "org.freedesktop.login1",
+ "/org/freedesktop/login1",
+ "org.freedesktop.login1.Manager",
+ method,
+ &error,
+ NULL,
+ "b",
+ arg_ask_password);
+
+ if (r < 0)
+ log_error("Failed to execute operation: %s", bus_error_message(&error, r));
+
+ return r;
+}
+
+static int elogind_schedule_shutdown(sd_bus *bus, enum elogind_action a) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ const char *method = NULL;
+ int r;
+
+ if (!bus)
+ return -EIO;
+
+ polkit_agent_open_if_enabled();
+
+ switch (a) {
+
+ case ACTION_POWEROFF:
+ method = "poweroff";
+ break;
+
+ case ACTION_REBOOT:
+ method = "reboot";
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ r = elogind_set_wall_message(bus, NULL);
+
+ if (r < 0) {
+ log_warning_errno(r, "Failed to set wall message, ignoring: %s",
+ bus_error_message(&error, r));
+ sd_bus_error_free(&error);
+ }
+
+ r = sd_bus_call_method(
+ bus,
+ "org.freedesktop.login1",
+ "/org/freedesktop/login1",
+ "org.freedesktop.login1.Manager",
+ "ScheduleShutdown",
+ &error,
+ NULL,
+ "st",
+ method,
+ arg_when);
+
+ if (r < 0)
+ log_error("Failed to execute operation: %s", bus_error_message(&error, r));
+
+ return r;
+}
+
+static int elogind_set_wall_message(sd_bus* bus, const char* msg) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_free_ char *m = NULL;
+ int r;
+
+ if (strv_extend(&arg_wall, msg) < 0)
+ return log_oom();
+
+ m = strv_join(arg_wall, " ");
+ if (!m)
+ return log_oom();
+
+ r = sd_bus_call_method(
+ bus,
+ "org.freedesktop.login1",
+ "/org/freedesktop/login1",
+ "org.freedesktop.login1.Manager",
+ "SetWallMessage",
+ &error,
+ NULL,
+ "sb",
+ m,
+ !arg_no_wall);
+
+ if (r < 0)
+ return log_warning_errno(r, "Failed to set wall message, ignoring: %s", bus_error_message(&error, r));
+
+ return 0;
+}
+
+static int parse_shutdown_time_spec(const char *t, usec_t *_u) {
+ assert(t);
+ assert(_u);
+
+ if (streq(t, "now"))
+ *_u = 0;
+ else if (!strchr(t, ':')) {
+ uint64_t u;
+
+ if (safe_atou64(t, &u) < 0)
+ return -EINVAL;
+
+ *_u = now(CLOCK_REALTIME) + USEC_PER_MINUTE * u;
+ } else {
+ char *e = NULL;
+ long hour, minute;
+ struct tm tm = {};
+ time_t s;
+ usec_t n;
+
+ errno = 0;
+ hour = strtol(t, &e, 10);
+ if (errno > 0 || *e != ':' || hour < 0 || hour > 23)
+ return -EINVAL;
+
+ minute = strtol(e+1, &e, 10);
+ if (errno > 0 || *e != 0 || minute < 0 || minute > 59)
+ return -EINVAL;
+
+ n = now(CLOCK_REALTIME);
+ s = (time_t) (n / USEC_PER_SEC);
+
+ assert_se(localtime_r(&s, &tm));
+
+ tm.tm_hour = (int) hour;
+ tm.tm_min = (int) minute;
+ tm.tm_sec = 0;
+
+ assert_se(s = mktime(&tm));
+
+ *_u = (usec_t) s * USEC_PER_SEC;
+
+ while (*_u <= n)
+ *_u += USEC_PER_DAY;
+ }
+
+ return 0;
+}
+
+void polkit_agent_open_if_enabled(void) {
+
+ /* Open the polkit agent as a child process if necessary */
+
+ if (!arg_ask_password)
+ return;
+
+ if (arg_transport != BUS_TRANSPORT_LOCAL)
+ return;
+
+ polkit_agent_open();
+}
+
+int start_special(int argc, char *argv[], void *userdata) {
+ sd_bus *bus = userdata;
+ enum elogind_action a;
+ int r;
+ char** wall = NULL;
+
+ assert(argv);
+
+ a = verb_to_action(argv[0]);
+
+ /* Switch to cancel shutdown, if a shutdown action was requested,
+ and the option to cancel it was set: */
+ if ( IN_SET(a, ACTION_POWEROFF, ACTION_REBOOT)
+ && (arg_action == ACTION_CANCEL_SHUTDOWN) )
+ return elogind_cancel_shutdown(bus);
+
+ r = check_inhibitors(bus, a);
+ if (r < 0)
+ return r;
+
+ /* No power off actions in chroot environments */
+ if ((a == ACTION_POWEROFF ||
+ a == ACTION_REBOOT) &&
+ (running_in_chroot() > 0) ) {
+ log_info("Running in chroot, ignoring request.");
+ return 0;
+ }
+
+ /* Check time arguments */
+ if ( IN_SET(a, ACTION_POWEROFF, ACTION_REBOOT)
+ && (argc > 1)
+ && (arg_action != ACTION_CANCEL_SHUTDOWN) ) {
+ r = parse_shutdown_time_spec(argv[1], &arg_when);
+ if (r < 0) {
+ log_error("Failed to parse time specification: %s", argv[optind]);
+ return r;
+ }
+ } else
+ arg_when = now(CLOCK_REALTIME) + USEC_PER_MINUTE;
+
+ /* The optional user wall message must be set */
+ if ((argc > 1) && (arg_action == ACTION_CANCEL_SHUTDOWN) )
+ /* No time argument for shutdown cancel */
+ wall = argv + 1;
+ else if (argc > 2)
+ /* We skip the time argument */
+ wall = argv + 2;
+
+ if (wall) {
+ arg_wall = strv_copy(wall);
+ if (!arg_wall)
+ return log_oom();
+ }
+
+ /* Perform requested action */
+ if (IN_SET(a,
+ ACTION_POWEROFF,
+ ACTION_REBOOT,
+ ACTION_SUSPEND,
+ ACTION_HIBERNATE,
+ ACTION_HYBRID_SLEEP)) {
+ if (arg_when > 0)
+ return elogind_schedule_shutdown(bus, a);
+ else
+ return elogind_reboot(bus, a);
+ }
+
+ return -EOPNOTSUPP;
+}
+
~ianmdlvl / elogind.git / blobdiff