Prep v231.2: Move elogind specific code in logind-dbus.c to elogind-dbus.c

1 files changed, 527 insertions, 0 deletions

diff --git a/src/login/elogind-dbus.c b/src/login/elogind-dbus.c
new file mode 100644
index 000000000..cf7f3dcb6
--- /dev/null
+++ b/src/login/elogind-dbus.c
@@ -0,0 +1,527 @@
+/***
+  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-common-errors.h"
+#include "bus-error.h"
+#include "bus-util.h"
+#include "elogind-dbus.h"
+#include "process-util.h"
+#include "sd-messages.h"
+#include "sleep-config.h"
+#include "string-util.h"
+#include "strv.h"
+#include "update-utmp.h"
+#include "user-util.h"
+
+
+int have_multiple_sessions(
+                Manager *m,
+                uid_t uid) {
+
+        Session *session;
+        Iterator i;
+
+        assert(m);
+
+        /* Check for other users' sessions. Greeter sessions do not
+         * count, and non-login sessions do not count either. */
+        HASHMAP_FOREACH(session, m->sessions, i)
+                if (session->class == SESSION_USER &&
+                    session->user->uid != uid)
+                        return true;
+
+        return false;
+}
+
+static int bus_manager_log_shutdown(
+                Manager *m,
+                InhibitWhat w,
+                HandleAction action) {
+
+         const char *p, *q;
+
+         assert(m);
+
+         if (w != INHIBIT_SHUTDOWN)
+                 return 0;
+
+         switch (action) {
+         case HANDLE_POWEROFF:
+                 p = "MESSAGE=System is powering down.";
+                 q = "SHUTDOWN=power-off";
+                 break;
+         case HANDLE_HALT:
+                 p = "MESSAGE=System is halting.";
+                 q = "SHUTDOWN=halt";
+                 break;
+         case HANDLE_REBOOT:
+                 p = "MESSAGE=System is rebooting.";
+                 q = "SHUTDOWN=reboot";
+                 break;
+         case HANDLE_KEXEC:
+                 p = "MESSAGE=System is rebooting with kexec.";
+                 q = "SHUTDOWN=kexec";
+                 break;
+         default:
+                 p = "MESSAGE=System is shutting down.";
+                 q = NULL;
+         }
+
+        if (isempty(m->wall_message))
+                p = strjoina(p, ".");
+        else
+                p = strjoina(p, " (", m->wall_message, ").");
+
+        return log_struct(LOG_NOTICE,
+                          LOG_MESSAGE_ID(SD_MESSAGE_SHUTDOWN),
+                          p,
+                          q,
+                          NULL);
+}
+
+static int send_prepare_for(Manager *m, InhibitWhat w, bool _active) {
+
+        static const char * const signal_name[_INHIBIT_WHAT_MAX] = {
+                [INHIBIT_SHUTDOWN] = "PrepareForShutdown",
+                [INHIBIT_SLEEP] = "PrepareForSleep"
+        };
+
+        int active = _active;
+
+        assert(m);
+        assert(w >= 0);
+        assert(w < _INHIBIT_WHAT_MAX);
+        assert(signal_name[w]);
+
+        return sd_bus_emit_signal(m->bus,
+                                  "/org/freedesktop/login1",
+                                  "org.freedesktop.login1.Manager",
+                                  signal_name[w],
+                                  "b",
+                                  active);
+}
+
+static int execute_shutdown_or_sleep(
+                Manager *m,
+                InhibitWhat w,
+                HandleAction action,
+                sd_bus_error *error) {
+
+        char** argv_utmp = NULL;
+        int r;
+
+        assert(m);
+        assert(w >= 0);
+        assert(w < _INHIBIT_WHAT_MAX);
+
+        bus_manager_log_shutdown(m, w, action);
+
+        if (IN_SET(action, HANDLE_HALT, HANDLE_POWEROFF, HANDLE_REBOOT)) {
+
+                /* As we have no systemd update-utmp daemon running, we have to
+                 * set the relevant utmp/wtmp entries ourselves.
+                 */
+
+                if (strv_extend(&argv_utmp, "elogind") < 0)
+                        return log_oom();
+
+                if (HANDLE_REBOOT == action) {
+                        if (strv_extend(&argv_utmp, "reboot") < 0)
+                                return log_oom();
+                } else {
+                        if (strv_extend(&argv_utmp, "shutdown") < 0)
+                                return log_oom();
+                }
+
+                 /* This comes from our patched update-utmp/update-utmp.c */
+                update_utmp(2, argv_utmp, m->bus);
+                strv_free(argv_utmp);
+        }
+
+        /* Now perform the requested action */
+        r = shutdown_or_sleep(m, action);
+
+        /* no more pending actions, whether this failed or not */
+        m->pending_action = HANDLE_IGNORE;
+
+        /* As elogind can not rely on a systemd manager to call all
+         * sleeping processes to wake up, we have to tell them all
+         * by ourselves. */
+        if (w == INHIBIT_SLEEP) {
+                send_prepare_for(m, w, false);
+                m->action_what = 0;
+        } else
+                m->action_what = w;
+
+        if (r < 0)
+                return r;
+
+        /* Make sure the lid switch is ignored for a while */
+        manager_set_lid_switch_ignore(m, now(CLOCK_MONOTONIC) + m->holdoff_timeout_usec);
+
+        return 0;
+}
+
+int manager_dispatch_delayed(Manager *manager, bool timeout) {
+
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        Inhibitor *offending = NULL;
+        int r;
+
+        assert(manager);
+
+        if ( (0 == manager->action_what) || (HANDLE_IGNORE == manager->pending_action) )
+                return 0;
+
+        if (manager_is_inhibited(manager, manager->action_what, INHIBIT_DELAY, NULL, false, false, 0, &offending)) {
+                _cleanup_free_ char *comm = NULL, *u = NULL;
+
+                if (!timeout)
+                        return 0;
+
+                (void) get_process_comm(offending->pid, &comm);
+                u = uid_to_name(offending->uid);
+
+                log_notice("Delay lock is active (UID "UID_FMT"/%s, PID "PID_FMT"/%s) but inhibitor timeout is reached.",
+                           offending->uid, strna(u),
+                           offending->pid, strna(comm));
+        }
+
+        /* Actually do the operation */
+        r = execute_shutdown_or_sleep(manager, manager->action_what, manager->pending_action, &error);
+        if (r < 0) {
+                log_warning("Failed to send delayed message: %s", bus_error_message(&error, r));
+
+                manager->pending_action = HANDLE_IGNORE;
+                manager->action_what    = 0;
+                /* It is not a critical error for elogind if suspending fails */
+        }
+
+        return 1;
+}
+
+static int manager_inhibit_timeout_handler(
+                        sd_event_source *s,
+                        uint64_t usec,
+                        void *userdata) {
+
+        Manager *manager = userdata;
+        int r;
+
+        assert(manager);
+        assert(manager->inhibit_timeout_source == s);
+
+        r = manager_dispatch_delayed(manager, true);
+        return (r < 0) ? r : 0;
+}
+
+static int delay_shutdown_or_sleep(
+                Manager *m,
+                InhibitWhat w,
+                HandleAction action) {
+
+        int r;
+        usec_t timeout_val;
+
+        assert(m);
+        assert(w >= 0);
+        assert(w < _INHIBIT_WHAT_MAX);
+
+        timeout_val = now(CLOCK_MONOTONIC) + m->inhibit_delay_max;
+
+        if (m->inhibit_timeout_source) {
+                r = sd_event_source_set_time(m->inhibit_timeout_source, timeout_val);
+                if (r < 0)
+                        return log_error_errno(r, "sd_event_source_set_time() failed: %m");
+
+                r = sd_event_source_set_enabled(m->inhibit_timeout_source, SD_EVENT_ONESHOT);
+                if (r < 0)
+                        return log_error_errno(r, "sd_event_source_set_enabled() failed: %m");
+        } else {
+                r = sd_event_add_time(m->event, &m->inhibit_timeout_source, CLOCK_MONOTONIC,
+                                      timeout_val, 0, manager_inhibit_timeout_handler, m);
+                if (r < 0)
+                        return r;
+        }
+
+        m->pending_action = action;
+        m->action_what = w;
+
+        return 0;
+}
+
+int bus_manager_shutdown_or_sleep_now_or_later(
+                Manager *m,
+                HandleAction action,
+                InhibitWhat w,
+                sd_bus_error *error) {
+
+        bool delayed;
+        int r;
+
+        assert(m);
+        assert(w >= 0);
+        assert(w <= _INHIBIT_WHAT_MAX);
+
+        /* Tell everybody to prepare for shutdown/sleep */
+        send_prepare_for(m, w, true);
+
+        delayed =
+                m->inhibit_delay_max > 0 &&
+                manager_is_inhibited(m, w, INHIBIT_DELAY, NULL, false, false, 0, NULL);
+
+        log_debug_elogind("%s called for %s (%sdelayed)", __FUNCTION__,
+                          handle_action_to_string(action),
+                          delayed ? "" : "NOT ");
+
+        if (delayed)
+                /* Shutdown is delayed, keep in mind what we
+                 * want to do, and start a timeout */
+                r = delay_shutdown_or_sleep(m, w, action);
+        else
+                /* Shutdown is not delayed, execute it
+                 * immediately */
+                r = execute_shutdown_or_sleep(m, w, action, error);
+
+        return r;
+}
+
+int verify_shutdown_creds(
+                Manager *m,
+                sd_bus_message *message,
+                InhibitWhat w,
+                bool interactive,
+                const char *action,
+                const char *action_multiple_sessions,
+                const char *action_ignore_inhibit,
+                sd_bus_error *error) {
+
+        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
+        bool multiple_sessions, blocked;
+        uid_t uid;
+        int r;
+
+        assert(m);
+        assert(message);
+        assert(w >= 0);
+        assert(w <= _INHIBIT_WHAT_MAX);
+
+        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_creds_get_euid(creds, &uid);
+        if (r < 0)
+                return r;
+
+        r = have_multiple_sessions(m, uid);
+        if (r < 0)
+                return r;
+
+        multiple_sessions = r > 0;
+        blocked = manager_is_inhibited(m, w, INHIBIT_BLOCK, NULL, false, true, uid, NULL);
+
+        if (multiple_sessions && action_multiple_sessions) {
+                r = bus_verify_polkit_async(message, CAP_SYS_BOOT, action_multiple_sessions, NULL, interactive, UID_INVALID, &m->polkit_registry, error);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
+        }
+
+        if (blocked && action_ignore_inhibit) {
+                r = bus_verify_polkit_async(message, CAP_SYS_BOOT, action_ignore_inhibit, NULL, interactive, UID_INVALID, &m->polkit_registry, error);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
+        }
+
+        if (!multiple_sessions && !blocked && action) {
+                r = bus_verify_polkit_async(message, CAP_SYS_BOOT, action, NULL, interactive, UID_INVALID, &m->polkit_registry, error);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
+        }
+
+        return 0;
+}
+
+static int method_do_shutdown_or_sleep(
+                Manager *m,
+                sd_bus_message *message,
+                HandleAction sleep_action,
+                InhibitWhat w,
+                const char *action,
+                const char *action_multiple_sessions,
+                const char *action_ignore_inhibit,
+                const char *sleep_verb,
+                sd_bus_error *error) {
+
+        int interactive, r;
+
+        assert(m);
+        assert(message);
+        assert(w >= 0);
+        assert(w <= _INHIBIT_WHAT_MAX);
+
+        r = sd_bus_message_read(message, "b", &interactive);
+        if (r < 0)
+                return r;
+
+        log_debug_elogind("%s called with action '%s', sleep '%s' (%sinteractive)",
+                          __FUNCTION__, action, sleep_verb,
+                          interactive ? "" : "NOT ");
+
+        /* Don't allow multiple jobs being executed at the same time */
+        if (m->action_what)
+                return sd_bus_error_setf(error, BUS_ERROR_OPERATION_IN_PROGRESS, "There's already a shutdown or sleep operation in progress");
+
+        if (sleep_verb) {
+                r = can_sleep(m, sleep_verb);
+                if (r < 0)
+                        return r;
+
+                if (r == 0)
+                        return sd_bus_error_setf(error, BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED, "Sleep verb not supported");
+        }
+
+        r = verify_shutdown_creds(m, message, w, interactive, action, action_multiple_sessions,
+                                  action_ignore_inhibit, error);
+        log_debug_elogind("verify_shutdown_creds() returned %d", r);
+        if (r != 0)
+                return r;
+
+        r = bus_manager_shutdown_or_sleep_now_or_later(m, sleep_action, w, error);
+        if (r < 0)
+                return r;
+
+        return sd_bus_reply_method_return(message, NULL);
+}
+
+int method_poweroff(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+
+        log_debug_elogind("%s called", __FUNCTION__);
+
+        return method_do_shutdown_or_sleep(
+                        m, message,
+                        HANDLE_POWEROFF,
+                        INHIBIT_SHUTDOWN,
+                        "org.freedesktop.login1.power-off",
+                        "org.freedesktop.login1.power-off-multiple-sessions",
+                        "org.freedesktop.login1.power-off-ignore-inhibit",
+                        NULL,
+                        error);
+}
+
+int method_reboot(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+
+        log_debug_elogind("%s called", __FUNCTION__);
+
+        return method_do_shutdown_or_sleep(
+                        m, message,
+                        HANDLE_REBOOT,
+                        INHIBIT_SHUTDOWN,
+                        "org.freedesktop.login1.reboot",
+                        "org.freedesktop.login1.reboot-multiple-sessions",
+                        "org.freedesktop.login1.reboot-ignore-inhibit",
+                        NULL,
+                        error);
+}
+
+int method_suspend(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+
+        log_debug_elogind("%s called", __FUNCTION__);
+
+        return method_do_shutdown_or_sleep(
+                        m, message,
+                        HANDLE_SUSPEND,
+                        INHIBIT_SLEEP,
+                        "org.freedesktop.login1.suspend",
+                        "org.freedesktop.login1.suspend-multiple-sessions",
+                        "org.freedesktop.login1.suspend-ignore-inhibit",
+                        "suspend",
+                        error);
+}
+
+int manager_scheduled_shutdown_handler(
+                        sd_event_source *s,
+                        uint64_t usec,
+                        void *userdata) {
+
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        Manager *m = userdata;
+        HandleAction action;
+        int r;
+
+        assert(m);
+
+        if (isempty(m->scheduled_shutdown_type))
+                return 0;
+
+        if (streq(m->scheduled_shutdown_type, "halt"))
+                action = HANDLE_HALT;
+        else if (streq(m->scheduled_shutdown_type, "poweroff"))
+                action = HANDLE_POWEROFF;
+        else
+                action = HANDLE_REBOOT;
+
+        r = execute_shutdown_or_sleep(m, 0, action, &error);
+        if (r < 0)
+                return log_error_errno(r, "Unable to execute transition to %s: %m", m->scheduled_shutdown_type);
+
+        return 0;
+}
+
+int method_hibernate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+
+        log_debug_elogind("%s called", __FUNCTION__);
+
+        return method_do_shutdown_or_sleep(
+                        m, message,
+                        HANDLE_HIBERNATE,
+                        INHIBIT_SLEEP,
+                        "org.freedesktop.login1.hibernate",
+                        "org.freedesktop.login1.hibernate-multiple-sessions",
+                        "org.freedesktop.login1.hibernate-ignore-inhibit",
+                        "hibernate",
+                        error);
+}
+
+int method_hybrid_sleep(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+
+        log_debug_elogind("%s called", __FUNCTION__);
+
+        return method_do_shutdown_or_sleep(
+                        m, message,
+                        HANDLE_HYBRID_SLEEP,
+                        INHIBIT_SLEEP,
+                        "org.freedesktop.login1.hibernate",
+                        "org.freedesktop.login1.hibernate-multiple-sessions",
+                        "org.freedesktop.login1.hibernate-ignore-inhibit",
+                        "hybrid-sleep",
+                        error);
+}