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systemd/src/login/logind.c
Yu Watanabe 405be62f05 tree-wide: refuse enumerated device with ID_PROCESSING=1 
When enumerated devices are being processed by udevd, we will receive
corresponding uevents later. So, we should not process devices in that
case.
2024-04-05 01:49:20 +09:00

1267 lines
42 KiB
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include "sd-daemon.h"
#include "sd-device.h"
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-locator.h"
#include "bus-log-control-api.h"
#include "bus-polkit.h"
#include "cgroup-util.h"
#include "common-signal.h"
#include "constants.h"
#include "daemon-util.h"
#include "device-util.h"
#include "devnum-util.h"
#include "dirent-util.h"
#include "escape.h"
#include "fd-util.h"
#include "format-util.h"
#include "fs-util.h"
#include "logind-dbus.h"
#include "logind-seat-dbus.h"
#include "logind-session-dbus.h"
#include "logind-user-dbus.h"
#include "logind.h"
#include "main-func.h"
#include "mkdir-label.h"
#include "parse-util.h"
#include "process-util.h"
#include "selinux-util.h"
#include "service-util.h"
#include "signal-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "udev-util.h"
#include "user-util.h"
static Manager* manager_free(Manager *m);
DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(device_hash_ops, char, string_hash_func, string_compare_func, Device, device_free);
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(seat_hash_ops, char, string_hash_func, string_compare_func, Seat, seat_free);
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(session_hash_ops, char, string_hash_func, string_compare_func, Session, session_free);
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(user_hash_ops, void, trivial_hash_func, trivial_compare_func, User, user_free);
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(inhibitor_hash_ops, char, string_hash_func, string_compare_func, Inhibitor, inhibitor_free);
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(button_hash_ops, char, string_hash_func, string_compare_func, Button, button_free);
static int manager_new(Manager **ret) {
_cleanup_(manager_freep) Manager *m = NULL;
int r;
assert(ret);
m = new(Manager, 1);
if (!m)
return -ENOMEM;
*m = (Manager) {
.console_active_fd = -EBADF,
.reserve_vt_fd = -EBADF,
.enable_wall_messages = true,
.idle_action_not_before_usec = now(CLOCK_MONOTONIC),
.scheduled_shutdown_action = _HANDLE_ACTION_INVALID,
.devices = hashmap_new(&device_hash_ops),
.seats = hashmap_new(&seat_hash_ops),
.sessions = hashmap_new(&session_hash_ops),
.users = hashmap_new(&user_hash_ops),
.inhibitors = hashmap_new(&inhibitor_hash_ops),
.buttons = hashmap_new(&button_hash_ops),
.user_units = hashmap_new(&string_hash_ops),
.session_units = hashmap_new(&string_hash_ops),
};
if (!m->devices || !m->seats || !m->sessions || !m->users || !m->inhibitors || !m->buttons || !m->user_units || !m->session_units)
return -ENOMEM;
r = sd_event_default(&m->event);
if (r < 0)
return r;
r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
if (r < 0)
return r;
r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
if (r < 0)
return r;
r = sd_event_add_signal(m->event, NULL, SIGRTMIN+18, sigrtmin18_handler, NULL);
if (r < 0)
return r;
r = sd_event_add_memory_pressure(m->event, NULL, NULL, NULL);
if (r < 0)
log_debug_errno(r, "Failed allocate memory pressure event source, ignoring: %m");
(void) sd_event_set_watchdog(m->event, true);
manager_reset_config(m);
*ret = TAKE_PTR(m);
return 0;
}
static Manager* manager_free(Manager *m) {
if (!m)
return NULL;
hashmap_free(m->devices);
hashmap_free(m->seats);
hashmap_free(m->sessions);
/* All records should have been removed by session_free */
assert(hashmap_isempty(m->sessions_by_leader));
hashmap_free(m->sessions_by_leader);
hashmap_free(m->users);
hashmap_free(m->inhibitors);
hashmap_free(m->buttons);
hashmap_free(m->brightness_writers);
hashmap_free(m->user_units);
hashmap_free(m->session_units);
sd_event_source_unref(m->idle_action_event_source);
sd_event_source_unref(m->inhibit_timeout_source);
sd_event_source_unref(m->scheduled_shutdown_timeout_source);
sd_event_source_unref(m->nologin_timeout_source);
sd_event_source_unref(m->wall_message_timeout_source);
sd_event_source_unref(m->console_active_event_source);
sd_event_source_unref(m->lid_switch_ignore_event_source);
sd_event_source_unref(m->reboot_key_long_press_event_source);
#if ENABLE_UTMP
sd_event_source_unref(m->utmp_event_source);
#endif
safe_close(m->console_active_fd);
sd_device_monitor_unref(m->device_seat_monitor);
sd_device_monitor_unref(m->device_monitor);
sd_device_monitor_unref(m->device_vcsa_monitor);
sd_device_monitor_unref(m->device_button_monitor);
if (m->unlink_nologin)
(void) unlink_or_warn("/run/nologin");
hashmap_free(m->polkit_registry);
sd_bus_flush_close_unref(m->bus);
sd_event_unref(m->event);
safe_close(m->reserve_vt_fd);
strv_free(m->kill_only_users);
strv_free(m->kill_exclude_users);
free(m->scheduled_shutdown_tty);
free(m->wall_message);
free(m->action_job);
strv_free(m->efi_boot_loader_entries);
free(m->efi_loader_entry_one_shot);
return mfree(m);
}
static int manager_enumerate_devices(Manager *m) {
_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
int r;
assert(m);
/* Loads devices from udev and creates seats for them as
* necessary */
r = sd_device_enumerator_new(&e);
if (r < 0)
return r;
r = sd_device_enumerator_add_match_tag(e, "master-of-seat");
if (r < 0)
return r;
r = 0;
FOREACH_DEVICE(e, d) {
if (device_is_processed(d) <= 0)
continue;
RET_GATHER(r, manager_process_seat_device(m, d));
}
return r;
}
static int manager_enumerate_buttons(Manager *m) {
_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
int r;
assert(m);
/* Loads buttons from udev */
if (manager_all_buttons_ignored(m))
return 0;
r = sd_device_enumerator_new(&e);
if (r < 0)
return r;
r = sd_device_enumerator_add_match_subsystem(e, "input", true);
if (r < 0)
return r;
r = sd_device_enumerator_add_match_tag(e, "power-switch");
if (r < 0)
return r;
r = 0;
FOREACH_DEVICE(e, d) {
if (device_is_processed(d) <= 0)
continue;
RET_GATHER(r, manager_process_button_device(m, d));
}
return r;
}
static int manager_enumerate_seats(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
int r = 0;
assert(m);
/* This loads data about seats stored on disk, but does not
* actually create any seats. Removes data of seats that no
* longer exist. */
d = opendir("/run/systemd/seats");
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /run/systemd/seats/: %m");
}
FOREACH_DIRENT(de, d, return -errno) {
Seat *s;
if (!dirent_is_file(de))
continue;
s = hashmap_get(m->seats, de->d_name);
if (!s) {
if (unlinkat(dirfd(d), de->d_name, 0) < 0)
log_warning_errno(errno, "Failed to remove /run/systemd/seats/%s, ignoring: %m",
de->d_name);
continue;
}
RET_GATHER(r, seat_load(s));
}
return r;
}
static int manager_enumerate_linger_users(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
int r = 0;
assert(m);
d = opendir("/var/lib/systemd/linger");
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /var/lib/systemd/linger/: %m");
}
FOREACH_DIRENT(de, d, return -errno) {
_cleanup_free_ char *n = NULL;
int k;
if (!dirent_is_file(de))
continue;
k = cunescape(de->d_name, 0, &n);
if (k < 0) {
RET_GATHER(r, log_warning_errno(k, "Failed to unescape username '%s', ignoring: %m", de->d_name));
continue;
}
k = manager_add_user_by_name(m, n, NULL);
if (k < 0)
RET_GATHER(r, log_warning_errno(k, "Couldn't add lingering user %s, ignoring: %m", de->d_name));
}
return r;
}
static int manager_enumerate_users(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
int r;
assert(m);
/* Add lingering users */
r = manager_enumerate_linger_users(m);
/* Read in user data stored on disk */
d = opendir("/run/systemd/users");
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /run/systemd/users/: %m");
}
FOREACH_DIRENT(de, d, return -errno) {
User *u;
uid_t uid;
int k;
if (!dirent_is_file(de))
continue;
k = parse_uid(de->d_name, &uid);
if (k < 0) {
RET_GATHER(r, log_warning_errno(k, "Failed to parse filename /run/systemd/users/%s as UID, ignoring: %m", de->d_name));
continue;
}
k = manager_add_user_by_uid(m, uid, &u);
if (k < 0) {
RET_GATHER(r, log_warning_errno(k, "Failed to add user by filename %s, ignoring: %m", de->d_name));
continue;
}
user_add_to_gc_queue(u);
RET_GATHER(r, user_load(u));
}
return r;
}
static int parse_fdname(const char *fdname, char **ret_session_id, dev_t *ret_devno) {
_cleanup_strv_free_ char **parts = NULL;
_cleanup_free_ char *id = NULL;
int r;
assert(ret_session_id);
assert(ret_devno);
parts = strv_split(fdname, "-");
if (!parts)
return -ENOMEM;
if (_unlikely_(!streq(parts[0], "session")))
return -EINVAL;
id = strdup(parts[1]);
if (!id)
return -ENOMEM;
if (streq(parts[2], "leader")) {
*ret_session_id = TAKE_PTR(id);
*ret_devno = 0;
return 0;
}
if (_unlikely_(!streq(parts[2], "device")))
return -EINVAL;
unsigned major, minor;
r = safe_atou(parts[3], &major);
if (r < 0)
return r;
r = safe_atou(parts[4], &minor);
if (r < 0)
return r;
*ret_session_id = TAKE_PTR(id);
*ret_devno = makedev(major, minor);
return 0;
}
static int deliver_session_device_fd(Session *s, const char *fdname, int fd, dev_t devno) {
SessionDevice *sd;
struct stat st;
assert(s);
assert(fdname);
assert(fd >= 0);
assert(devno > 0);
if (fstat(fd, &st) < 0)
/* The device is allowed to go away at a random point, in which case fstat() failing is
* expected. */
return log_debug_errno(errno, "Failed to stat device fd '%s' for session '%s': %m",
fdname, s->id);
if (!S_ISCHR(st.st_mode) || st.st_rdev != devno)
return log_debug_errno(SYNTHETIC_ERRNO(ENODEV),
"Device fd '%s' doesn't point to the expected character device node.",
fdname);
sd = hashmap_get(s->devices, &devno);
if (!sd)
/* Weird, we got an fd for a session device which wasn't recorded in the session state
* file... */
return log_warning_errno(SYNTHETIC_ERRNO(ENODEV),
"Got session device fd '%s' [" DEVNUM_FORMAT_STR "], but not present in session state.",
fdname, DEVNUM_FORMAT_VAL(devno));
log_debug("Attaching session device fd '%s' [" DEVNUM_FORMAT_STR "] to session '%s'.",
fdname, DEVNUM_FORMAT_VAL(devno), s->id);
session_device_attach_fd(sd, fd, s->was_active);
return 0;
}
static int deliver_session_leader_fd_consume(Session *s, const char *fdname, int fd) {
_cleanup_(pidref_done) PidRef leader_fdstore = PIDREF_NULL;
int r;
assert(s);
assert(fdname);
assert(fd >= 0);
if (!pid_is_valid(s->deserialized_pid)) {
r = log_warning_errno(SYNTHETIC_ERRNO(EOWNERDEAD),
"Got leader pidfd for session '%s', but LEADER= is not set, refusing.",
s->id);
goto fail_close;
}
if (!s->leader_fd_saved)
log_warning("Got leader pidfd for session '%s', but not recorded in session state, proceeding anyway.",
s->id);
else
assert(!pidref_is_set(&s->leader));
r = pidref_set_pidfd_take(&leader_fdstore, fd);
if (r < 0) {
if (r == -ESRCH)
log_debug_errno(r, "Leader of session '%s' is gone while deserializing.", s->id);
else
log_warning_errno(r, "Failed to create reference to leader of session '%s': %m", s->id);
goto fail_close;
}
if (leader_fdstore.pid != s->deserialized_pid)
log_warning("Leader from pidfd (" PID_FMT ") doesn't match with LEADER=" PID_FMT " for session '%s', proceeding anyway.",
leader_fdstore.pid, s->deserialized_pid, s->id);
r = session_set_leader_consume(s, TAKE_PIDREF(leader_fdstore));
if (r < 0)
return log_warning_errno(r, "Failed to attach leader pidfd for session '%s': %m", s->id);
return 0;
fail_close:
close_and_notify_warn(fd, fdname);
return r;
}
static int manager_attach_session_fd_one_consume(Manager *m, const char *fdname, int fd) {
_cleanup_free_ char *id = NULL;
dev_t devno = 0; /* Explicit initialization to appease gcc */
Session *s;
int r;
assert(m);
assert(fdname);
assert(fd >= 0);
r = parse_fdname(fdname, &id, &devno);
if (r < 0) {
log_warning_errno(r, "Failed to parse stored fd name '%s': %m", fdname);
goto fail_close;
}
s = hashmap_get(m->sessions, id);
if (!s) {
/* If the session doesn't exist anymore, let's simply close this fd. */
r = log_debug_errno(SYNTHETIC_ERRNO(ENXIO),
"Cannot attach fd '%s' to unknown session '%s', ignoring.", fdname, id);
goto fail_close;
}
if (devno > 0) {
r = deliver_session_device_fd(s, fdname, fd, devno);
if (r < 0)
goto fail_close;
return 0;
}
/* Takes ownership of fd on both success and failure */
return deliver_session_leader_fd_consume(s, fdname, fd);
fail_close:
close_and_notify_warn(fd, fdname);
return r;
}
static int manager_enumerate_sessions(Manager *m) {
_cleanup_strv_free_ char **fdnames = NULL;
_cleanup_closedir_ DIR *d = NULL;
int r = 0, n;
assert(m);
/* Read in session data stored on disk */
d = opendir("/run/systemd/sessions");
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /run/systemd/sessions/: %m");
}
FOREACH_DIRENT(de, d, return -errno) {
Session *s;
int k;
if (!dirent_is_file(de))
continue;
k = manager_add_session(m, de->d_name, &s);
if (k < 0) {
RET_GATHER(r, log_warning_errno(k, "Failed to add session by filename %s, ignoring: %m", de->d_name));
continue;
}
session_add_to_gc_queue(s);
k = session_load(s);
if (k < 0)
RET_GATHER(r, log_warning_errno(k, "Failed to deserialize session '%s', ignoring: %m", s->id));
}
n = sd_listen_fds_with_names(/* unset_environment = */ true, &fdnames);
if (n < 0)
return log_error_errno(n, "Failed to acquire passed fd list: %m");
for (int i = 0; i < n; i++) {
int fd = SD_LISTEN_FDS_START + i;
RET_GATHER(r, manager_attach_session_fd_one_consume(m, fdnames[i], fd));
}
return r;
}
static int manager_enumerate_inhibitors(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
int r = 0;
assert(m);
d = opendir("/run/systemd/inhibit");
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /run/systemd/inhibit/: %m");
}
FOREACH_DIRENT(de, d, return -errno) {
Inhibitor *i;
int k;
if (!dirent_is_file(de))
continue;
k = manager_add_inhibitor(m, de->d_name, &i);
if (k < 0) {
RET_GATHER(r, log_warning_errno(k, "Couldn't add inhibitor %s, ignoring: %m", de->d_name));
continue;
}
RET_GATHER(r, inhibitor_load(i));
}
return r;
}
static int manager_dispatch_seat_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
Manager *m = ASSERT_PTR(userdata);
assert(device);
manager_process_seat_device(m, device);
return 0;
}
static int manager_dispatch_device_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
Manager *m = ASSERT_PTR(userdata);
assert(device);
manager_process_seat_device(m, device);
return 0;
}
static int manager_dispatch_vcsa_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
Manager *m = ASSERT_PTR(userdata);
const char *name;
assert(device);
/* Whenever a VCSA device is removed try to reallocate our
* VTs, to make sure our auto VTs never go away. */
if (sd_device_get_sysname(device, &name) >= 0 &&
startswith(name, "vcsa") &&
device_for_action(device, SD_DEVICE_REMOVE))
seat_preallocate_vts(m->seat0);
return 0;
}
static int manager_dispatch_button_udev(sd_device_monitor *monitor, sd_device *device, void *userdata) {
Manager *m = ASSERT_PTR(userdata);
assert(device);
manager_process_button_device(m, device);
return 0;
}
static int manager_dispatch_console(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
Manager *m = ASSERT_PTR(userdata);
assert(m->seat0);
assert(m->console_active_fd == fd);
seat_read_active_vt(m->seat0);
return 0;
}
static int manager_reserve_vt(Manager *m) {
_cleanup_free_ char *p = NULL;
assert(m);
if (m->reserve_vt <= 0)
return 0;
if (asprintf(&p, "/dev/tty%u", m->reserve_vt) < 0)
return log_oom();
m->reserve_vt_fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (m->reserve_vt_fd < 0) {
/* Don't complain on VT-less systems */
if (errno != ENOENT)
log_warning_errno(errno, "Failed to pin reserved VT: %m");
return -errno;
}
return 0;
}
static int manager_connect_bus(Manager *m) {
int r;
assert(m);
assert(!m->bus);
r = sd_bus_default_system(&m->bus);
if (r < 0)
return log_error_errno(r, "Failed to connect to system bus: %m");
r = bus_add_implementation(m->bus, &manager_object, m);
if (r < 0)
return r;
r = bus_log_control_api_register(m->bus);
if (r < 0)
return r;
r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "JobRemoved", match_job_removed, NULL, m);
if (r < 0)
return log_error_errno(r, "Failed to request match for JobRemoved: %m");
r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "UnitRemoved", match_unit_removed, NULL, m);
if (r < 0)
return log_error_errno(r, "Failed to request match for UnitRemoved: %m");
r = sd_bus_match_signal_async(
m->bus,
NULL,
"org.freedesktop.systemd1",
NULL,
"org.freedesktop.DBus.Properties",
"PropertiesChanged",
match_properties_changed, NULL, m);
if (r < 0)
return log_error_errno(r, "Failed to request match for PropertiesChanged: %m");
r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "Reloading", match_reloading, NULL, m);
if (r < 0)
return log_error_errno(r, "Failed to request match for Reloading: %m");
r = bus_call_method_async(m->bus, NULL, bus_systemd_mgr, "Subscribe", NULL, NULL, NULL);
if (r < 0)
return log_error_errno(r, "Failed to enable subscription: %m");
r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.login1", 0, NULL, NULL);
if (r < 0)
return log_error_errno(r, "Failed to request name: %m");
r = sd_bus_attach_event(m->bus, m->event, SD_EVENT_PRIORITY_NORMAL);
if (r < 0)
return log_error_errno(r, "Failed to attach bus to event loop: %m");
return 0;
}
static int manager_vt_switch(sd_event_source *src, const struct signalfd_siginfo *si, void *data) {
Manager *m = ASSERT_PTR(data);
Session *active;
/*
* We got a VT-switch signal and we have to acknowledge it immediately.
* Preferably, we'd just use m->seat0->active->vtfd, but unfortunately,
* old user-space might run multiple sessions on a single VT, *sigh*.
* Therefore, we have to iterate all sessions and find one with a vtfd
* on the requested VT.
* As only VTs with active controllers have VT_PROCESS set, our current
* notion of the active VT might be wrong (for instance if the switch
* happens while we setup VT_PROCESS). Therefore, read the current VT
* first and then use s->active->vtnr as reference. Note that this is
* not racy, as no further VT-switch can happen as long as we're in
* synchronous VT_PROCESS mode.
*/
assert(m->seat0);
seat_read_active_vt(m->seat0);
active = m->seat0->active;
if (!active || active->vtnr < 1) {
_cleanup_close_ int fd = -EBADF;
int r;
/* We are requested to acknowledge the VT-switch signal by the kernel but
* there's no registered sessions for the current VT. Normally this
* shouldn't happen but something wrong might have happened when we tried
* to release the VT. Better be safe than sorry, and try to release the VT
* one more time otherwise the user will be locked with the current VT. */
log_warning("Received VT_PROCESS signal without a registered session, restoring VT.");
/* At this point we only have the kernel mapping for referring to the current VT. */
fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0) {
log_warning_errno(fd, "Failed to open current VT, ignoring: %m");
return 0;
}
r = vt_release(fd, /* restore = */ true);
if (r < 0)
log_warning_errno(r, "Failed to release current VT, ignoring: %m");
return 0;
}
if (active->vtfd >= 0)
session_leave_vt(active);
else
LIST_FOREACH(sessions_by_seat, iter, m->seat0->sessions)
if (iter->vtnr == active->vtnr && iter->vtfd >= 0) {
session_leave_vt(iter);
break;
}
return 0;
}
static int manager_connect_console(Manager *m) {
int r;
assert(m);
assert(m->console_active_fd < 0);
/* On certain systems (such as S390, Xen, and containers) /dev/tty0 does not exist (as there is no VC), so
* don't fail if we can't open it. */
if (access("/dev/tty0", F_OK) < 0)
return 0;
m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (m->console_active_fd < 0) {
/* On some systems /dev/tty0 may exist even though /sys/class/tty/tty0 does not. These are broken, but
* common. Let's complain but continue anyway. */
if (errno == ENOENT) {
log_warning_errno(errno, "System has /dev/tty0 but not /sys/class/tty/tty0/active which is broken, ignoring: %m");
return 0;
}
return log_error_errno(errno, "Failed to open /sys/class/tty/tty0/active: %m");
}
r = sd_event_add_io(m->event, &m->console_active_event_source, m->console_active_fd, 0, manager_dispatch_console, m);
if (r < 0)
return log_error_errno(r, "Failed to watch foreground console: %m");
/*
* SIGRTMIN is used as global VT-release signal, SIGRTMIN + 1 is used
* as VT-acquire signal. We ignore any acquire-events (yes, we still
* have to provide a valid signal-number for it!) and acknowledge all
* release events immediately.
*/
if (SIGRTMIN + 1 > SIGRTMAX)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Not enough real-time signals available: %i-%i",
SIGRTMIN, SIGRTMAX);
assert_se(ignore_signals(SIGRTMIN + 1) >= 0);
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN) >= 0);
r = sd_event_add_signal(m->event, NULL, SIGRTMIN, manager_vt_switch, m);
if (r < 0)
return log_error_errno(r, "Failed to subscribe to signal: %m");
return 0;
}
static int manager_connect_udev(Manager *m) {
int r;
assert(m);
assert(!m->device_seat_monitor);
assert(!m->device_monitor);
assert(!m->device_vcsa_monitor);
assert(!m->device_button_monitor);
r = sd_device_monitor_new(&m->device_seat_monitor);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_tag(m->device_seat_monitor, "master-of-seat");
if (r < 0)
return r;
r = sd_device_monitor_attach_event(m->device_seat_monitor, m->event);
if (r < 0)
return r;
r = sd_device_monitor_start(m->device_seat_monitor, manager_dispatch_seat_udev, m);
if (r < 0)
return r;
(void) sd_device_monitor_set_description(m->device_seat_monitor, "seat");
r = sd_device_monitor_new(&m->device_monitor);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "input", NULL);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "graphics", NULL);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_monitor, "drm", NULL);
if (r < 0)
return r;
r = sd_device_monitor_attach_event(m->device_monitor, m->event);
if (r < 0)
return r;
r = sd_device_monitor_start(m->device_monitor, manager_dispatch_device_udev, m);
if (r < 0)
return r;
(void) sd_device_monitor_set_description(m->device_monitor, "input,graphics,drm");
/* Don't watch keys if nobody cares */
if (!manager_all_buttons_ignored(m)) {
r = sd_device_monitor_new(&m->device_button_monitor);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_tag(m->device_button_monitor, "power-switch");
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_button_monitor, "input", NULL);
if (r < 0)
return r;
r = sd_device_monitor_attach_event(m->device_button_monitor, m->event);
if (r < 0)
return r;
r = sd_device_monitor_start(m->device_button_monitor, manager_dispatch_button_udev, m);
if (r < 0)
return r;
(void) sd_device_monitor_set_description(m->device_button_monitor, "button");
}
/* Don't bother watching VCSA devices, if nobody cares */
if (m->n_autovts > 0 && m->console_active_fd >= 0) {
r = sd_device_monitor_new(&m->device_vcsa_monitor);
if (r < 0)
return r;
r = sd_device_monitor_filter_add_match_subsystem_devtype(m->device_vcsa_monitor, "vc", NULL);
if (r < 0)
return r;
r = sd_device_monitor_attach_event(m->device_vcsa_monitor, m->event);
if (r < 0)
return r;
r = sd_device_monitor_start(m->device_vcsa_monitor, manager_dispatch_vcsa_udev, m);
if (r < 0)
return r;
(void) sd_device_monitor_set_description(m->device_vcsa_monitor, "vcsa");
}
return 0;
}
static void manager_gc(Manager *m, bool drop_not_started) {
Seat *seat;
Session *session;
User *user;
assert(m);
while ((seat = LIST_POP(gc_queue, m->seat_gc_queue))) {
seat->in_gc_queue = false;
if (seat_may_gc(seat, drop_not_started)) {
seat_stop(seat, /* force = */ false);
seat_free(seat);
}
}
while ((session = LIST_POP(gc_queue, m->session_gc_queue))) {
session->in_gc_queue = false;
/* First, if we are not closing yet, initiate stopping. */
if (session_may_gc(session, drop_not_started) &&
session_get_state(session) != SESSION_CLOSING)
(void) session_stop(session, /* force = */ false);
/* Normally, this should make the session referenced again, if it doesn't then let's get rid
* of it immediately. */
if (session_may_gc(session, drop_not_started)) {
(void) session_finalize(session);
session_free(session);
}
}
while ((user = LIST_POP(gc_queue, m->user_gc_queue))) {
user->in_gc_queue = false;
/* First step: queue stop jobs */
if (user_may_gc(user, drop_not_started))
(void) user_stop(user, false);
/* Second step: finalize user */
if (user_may_gc(user, drop_not_started)) {
(void) user_finalize(user);
user_free(user);
}
}
}
static int manager_dispatch_idle_action(sd_event_source *s, uint64_t t, void *userdata) {
Manager *m = ASSERT_PTR(userdata);
struct dual_timestamp since;
usec_t n, elapse;
int r;
if (m->idle_action == HANDLE_IGNORE ||
m->idle_action_usec <= 0)
return 0;
n = now(CLOCK_MONOTONIC);
r = manager_get_idle_hint(m, &since);
if (r <= 0) {
/* Not idle. Let's check if after a timeout it might be idle then. */
elapse = n + m->idle_action_usec;
m->was_idle = false;
} else {
/* Idle! Let's see if it's time to do something, or if
* we shall sleep for longer. */
if (n >= since.monotonic + m->idle_action_usec &&
(m->idle_action_not_before_usec <= 0 || n >= m->idle_action_not_before_usec + m->idle_action_usec)) {
bool is_edge = false;
/* We weren't idle previously or some activity happened while we were sleeping, and now we are
* idle. Let's remember that for the next time and make this an edge transition. */
if (!m->was_idle || since.monotonic >= m->idle_action_not_before_usec) {
is_edge = true;
m->was_idle = true;
}
if (m->idle_action == HANDLE_LOCK && !is_edge)
/* We are idle and we were before so we are actually not taking any action. */
log_debug("System idle.");
else
log_info("System idle. Will %s now.", handle_action_verb_to_string(m->idle_action));
manager_handle_action(m, 0, m->idle_action, false, is_edge);
m->idle_action_not_before_usec = n;
}
elapse = MAX(since.monotonic, m->idle_action_not_before_usec) + m->idle_action_usec;
}
if (!m->idle_action_event_source) {
r = sd_event_add_time(
m->event,
&m->idle_action_event_source,
CLOCK_MONOTONIC,
elapse, MIN(USEC_PER_SEC*30, m->idle_action_usec), /* accuracy of 30s, but don't have an accuracy lower than the idle action timeout */
manager_dispatch_idle_action, m);
if (r < 0)
return log_error_errno(r, "Failed to add idle event source: %m");
r = sd_event_source_set_priority(m->idle_action_event_source, SD_EVENT_PRIORITY_IDLE+10);
if (r < 0)
return log_error_errno(r, "Failed to set idle event source priority: %m");
} else {
r = sd_event_source_set_time(m->idle_action_event_source, elapse);
if (r < 0)
return log_error_errno(r, "Failed to set idle event timer: %m");
r = sd_event_source_set_enabled(m->idle_action_event_source, SD_EVENT_ONESHOT);
if (r < 0)
return log_error_errno(r, "Failed to enable idle event timer: %m");
}
return 0;
}
static int manager_dispatch_reload_signal(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
Manager *m = userdata;
int r;
(void) notify_reloading();
manager_reset_config(m);
r = manager_parse_config_file(m);
if (r < 0)
log_warning_errno(r, "Failed to parse config file, using defaults: %m");
else
log_info("Config file reloaded.");
(void) sd_notify(/* unset= */ false, NOTIFY_READY);
return 0;
}
static int manager_startup(Manager *m) {
int r;
Seat *seat;
Session *session;
User *user;
Button *button;
Inhibitor *inhibitor;
assert(m);
r = sd_event_add_signal(m->event, NULL, SIGHUP, manager_dispatch_reload_signal, m);
if (r < 0)
return log_error_errno(r, "Failed to register SIGHUP handler: %m");
/* Connect to utmp */
manager_connect_utmp(m);
/* Connect to console */
r = manager_connect_console(m);
if (r < 0)
return r;
/* Connect to udev */
r = manager_connect_udev(m);
if (r < 0)
return log_error_errno(r, "Failed to create udev watchers: %m");
/* Connect to the bus */
r = manager_connect_bus(m);
if (r < 0)
return r;
/* Instantiate magic seat 0 */
r = manager_add_seat(m, "seat0", &m->seat0);
if (r < 0)
return log_error_errno(r, "Failed to add seat0: %m");
r = manager_set_lid_switch_ignore(m, 0 + m->holdoff_timeout_usec);
if (r < 0)
log_warning_errno(r, "Failed to set up lid switch ignore event source: %m");
/* Deserialize state */
r = manager_enumerate_devices(m);
if (r < 0)
log_warning_errno(r, "Device enumeration failed: %m");
r = manager_enumerate_seats(m);
if (r < 0)
log_warning_errno(r, "Seat enumeration failed: %m");
r = manager_enumerate_users(m);
if (r < 0)
log_warning_errno(r, "User enumeration failed: %m");
r = manager_enumerate_sessions(m);
if (r < 0)
log_warning_errno(r, "Session enumeration failed: %m");
r = manager_enumerate_inhibitors(m);
if (r < 0)
log_warning_errno(r, "Inhibitor enumeration failed: %m");
r = manager_enumerate_buttons(m);
if (r < 0)
log_warning_errno(r, "Button enumeration failed: %m");
manager_load_scheduled_shutdown(m);
/* Remove stale objects before we start them */
manager_gc(m, false);
/* Reserve the special reserved VT */
manager_reserve_vt(m);
/* Read in utmp if it exists */
manager_read_utmp(m);
/* And start everything */
HASHMAP_FOREACH(seat, m->seats)
(void) seat_start(seat);
HASHMAP_FOREACH(user, m->users)
(void) user_start(user);
HASHMAP_FOREACH(session, m->sessions)
(void) session_start(session, NULL, NULL);
HASHMAP_FOREACH(inhibitor, m->inhibitors) {
(void) inhibitor_start(inhibitor);
/* Let's see if the inhibitor is dead now, then remove it */
if (inhibitor_is_orphan(inhibitor)) {
inhibitor_stop(inhibitor);
inhibitor_free(inhibitor);
}
}
HASHMAP_FOREACH(button, m->buttons)
button_check_switches(button);
manager_dispatch_idle_action(NULL, 0, m);
return 0;
}
static int manager_run(Manager *m) {
int r;
assert(m);
for (;;) {
r = sd_event_get_state(m->event);
if (r < 0)
return r;
if (r == SD_EVENT_FINISHED)
return 0;
manager_gc(m, true);
r = manager_dispatch_delayed(m, false);
if (r < 0)
return r;
if (r > 0)
continue;
r = sd_event_run(m->event, UINT64_MAX);
if (r < 0)
return r;
}
}
static int run(int argc, char *argv[]) {
_cleanup_(manager_freep) Manager *m = NULL;
_unused_ _cleanup_(notify_on_cleanup) const char *notify_message = NULL;
int r;
log_set_facility(LOG_AUTH);
log_setup();
r = service_parse_argv("systemd-logind.service",
"Manager for user logins and devices and privileged operations.",
BUS_IMPLEMENTATIONS(&manager_object,
&log_control_object),
argc, argv);
if (r <= 0)
return r;
umask(0022);
r = mac_init();
if (r < 0)
return r;
/* Always create the directories people can create inotify watches in. Note that some applications
* might check for the existence of /run/systemd/seats/ to determine whether logind is available, so
* please always make sure these directories are created early on and unconditionally. */
(void) mkdir_label("/run/systemd/seats", 0755);
(void) mkdir_label("/run/systemd/users", 0755);
(void) mkdir_label("/run/systemd/sessions", 0755);
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGHUP, SIGTERM, SIGINT, SIGCHLD, SIGRTMIN+18) >= 0);
r = manager_new(&m);
if (r < 0)
return log_error_errno(r, "Failed to allocate manager object: %m");
(void) manager_parse_config_file(m);
r = manager_startup(m);
if (r < 0)
return log_error_errno(r, "Failed to fully start up daemon: %m");
notify_message = notify_start(NOTIFY_READY, NOTIFY_STOPPING);
return manager_run(m);
}
DEFINE_MAIN_FUNCTION(run);
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