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Systemd/src/login/logind.c
Zbigniew Jędrzejewski-Szmek e8e581bf25 Report about syntax errors with metadata 
The information about the unit for which files are being parsed
is passed all the way down. This way messages land in the journal
with proper UNIT=... or USER_UNIT=... attribution.

'systemctl status' and 'journalctl -u' not displaying those messages
has been a source of confusion for users, since the journal entry for
a misspelt setting was often logged quite a bit earlier than the
failure to start a unit.

Based-on-a-patch-by: Oleksii Shevchuk <alxchk@gmail.com>
2013-04-17 00:09:16 -04:00

1760 lines
47 KiB
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Raw Blame History

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <pwd.h>
#include <libudev.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <linux/vt.h>
#include <sys/timerfd.h>
#include <systemd/sd-daemon.h>
#include "logind.h"
#include "dbus-common.h"
#include "dbus-loop.h"
#include "strv.h"
#include "conf-parser.h"
#include "mkdir.h"
Manager *manager_new(void) {
Manager *m;
m = new0(Manager, 1);
if (!m)
return NULL;
m->console_active_fd = -1;
m->bus_fd = -1;
m->udev_seat_fd = -1;
m->udev_vcsa_fd = -1;
m->udev_button_fd = -1;
m->epoll_fd = -1;
m->reserve_vt_fd = -1;
m->n_autovts = 6;
m->reserve_vt = 6;
m->inhibit_delay_max = 5 * USEC_PER_SEC;
m->handle_power_key = HANDLE_POWEROFF;
m->handle_suspend_key = HANDLE_SUSPEND;
m->handle_hibernate_key = HANDLE_HIBERNATE;
m->handle_lid_switch = HANDLE_SUSPEND;
m->lid_switch_ignore_inhibited = true;
m->idle_action_fd = -1;
m->idle_action_usec = 30 * USEC_PER_MINUTE;
m->idle_action = HANDLE_IGNORE;
m->idle_action_not_before_usec = now(CLOCK_MONOTONIC);
m->devices = hashmap_new(string_hash_func, string_compare_func);
m->seats = hashmap_new(string_hash_func, string_compare_func);
m->sessions = hashmap_new(string_hash_func, string_compare_func);
m->users = hashmap_new(trivial_hash_func, trivial_compare_func);
m->inhibitors = hashmap_new(string_hash_func, string_compare_func);
m->buttons = hashmap_new(string_hash_func, string_compare_func);
m->user_cgroups = hashmap_new(string_hash_func, string_compare_func);
m->session_cgroups = hashmap_new(string_hash_func, string_compare_func);
m->session_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
m->inhibitor_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
m->button_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
if (!m->devices || !m->seats || !m->sessions || !m->users || !m->inhibitors || !m->buttons ||
!m->user_cgroups || !m->session_cgroups ||
!m->session_fds || !m->inhibitor_fds || !m->button_fds) {
manager_free(m);
return NULL;
}
m->reset_controllers = strv_new("cpu", NULL);
m->kill_exclude_users = strv_new("root", NULL);
if (!m->reset_controllers || !m->kill_exclude_users) {
manager_free(m);
return NULL;
}
m->udev = udev_new();
if (!m->udev) {
manager_free(m);
return NULL;
}
if (cg_get_user_path(&m->cgroup_path) < 0) {
manager_free(m);
return NULL;
}
return m;
}
void manager_free(Manager *m) {
Session *session;
User *u;
Device *d;
Seat *s;
Inhibitor *i;
Button *b;
assert(m);
while ((session = hashmap_first(m->sessions)))
session_free(session);
while ((u = hashmap_first(m->users)))
user_free(u);
while ((d = hashmap_first(m->devices)))
device_free(d);
while ((s = hashmap_first(m->seats)))
seat_free(s);
while ((i = hashmap_first(m->inhibitors)))
inhibitor_free(i);
while ((b = hashmap_first(m->buttons)))
button_free(b);
hashmap_free(m->devices);
hashmap_free(m->seats);
hashmap_free(m->sessions);
hashmap_free(m->users);
hashmap_free(m->inhibitors);
hashmap_free(m->buttons);
hashmap_free(m->user_cgroups);
hashmap_free(m->session_cgroups);
hashmap_free(m->session_fds);
hashmap_free(m->inhibitor_fds);
hashmap_free(m->button_fds);
if (m->console_active_fd >= 0)
close_nointr_nofail(m->console_active_fd);
if (m->udev_seat_monitor)
udev_monitor_unref(m->udev_seat_monitor);
if (m->udev_vcsa_monitor)
udev_monitor_unref(m->udev_vcsa_monitor);
if (m->udev_button_monitor)
udev_monitor_unref(m->udev_button_monitor);
if (m->udev)
udev_unref(m->udev);
if (m->bus) {
dbus_connection_flush(m->bus);
dbus_connection_close(m->bus);
dbus_connection_unref(m->bus);
}
if (m->bus_fd >= 0)
close_nointr_nofail(m->bus_fd);
if (m->epoll_fd >= 0)
close_nointr_nofail(m->epoll_fd);
if (m->reserve_vt_fd >= 0)
close_nointr_nofail(m->reserve_vt_fd);
if (m->idle_action_fd >= 0)
close_nointr_nofail(m->idle_action_fd);
strv_free(m->controllers);
strv_free(m->reset_controllers);
strv_free(m->kill_only_users);
strv_free(m->kill_exclude_users);
free(m->action_job);
free(m->cgroup_path);
free(m);
}
int manager_add_device(Manager *m, const char *sysfs, Device **_device) {
Device *d;
assert(m);
assert(sysfs);
d = hashmap_get(m->devices, sysfs);
if (d) {
if (_device)
*_device = d;
return 0;
}
d = device_new(m, sysfs);
if (!d)
return -ENOMEM;
if (_device)
*_device = d;
return 0;
}
int manager_add_seat(Manager *m, const char *id, Seat **_seat) {
Seat *s;
assert(m);
assert(id);
s = hashmap_get(m->seats, id);
if (s) {
if (_seat)
*_seat = s;
return 0;
}
s = seat_new(m, id);
if (!s)
return -ENOMEM;
if (_seat)
*_seat = s;
return 0;
}
int manager_add_session(Manager *m, User *u, const char *id, Session **_session) {
Session *s;
assert(m);
assert(id);
s = hashmap_get(m->sessions, id);
if (s) {
if (_session)
*_session = s;
return 0;
}
s = session_new(m, u, id);
if (!s)
return -ENOMEM;
if (_session)
*_session = s;
return 0;
}
int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) {
User *u;
assert(m);
assert(name);
u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
if (u) {
if (_user)
*_user = u;
return 0;
}
u = user_new(m, uid, gid, name);
if (!u)
return -ENOMEM;
if (_user)
*_user = u;
return 0;
}
int manager_add_user_by_name(Manager *m, const char *name, User **_user) {
uid_t uid;
gid_t gid;
int r;
assert(m);
assert(name);
r = get_user_creds(&name, &uid, &gid, NULL, NULL);
if (r < 0)
return r;
return manager_add_user(m, uid, gid, name, _user);
}
int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) {
struct passwd *p;
assert(m);
errno = 0;
p = getpwuid(uid);
if (!p)
return errno ? -errno : -ENOENT;
return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user);
}
int manager_add_inhibitor(Manager *m, const char* id, Inhibitor **_inhibitor) {
Inhibitor *i;
assert(m);
assert(id);
i = hashmap_get(m->inhibitors, id);
if (i) {
if (_inhibitor)
*_inhibitor = i;
return 0;
}
i = inhibitor_new(m, id);
if (!i)
return -ENOMEM;
if (_inhibitor)
*_inhibitor = i;
return 0;
}
int manager_add_button(Manager *m, const char *name, Button **_button) {
Button *b;
assert(m);
assert(name);
b = hashmap_get(m->buttons, name);
if (b) {
if (_button)
*_button = b;
return 0;
}
b = button_new(m, name);
if (!b)
return -ENOMEM;
if (_button)
*_button = b;
return 0;
}
int manager_process_seat_device(Manager *m, struct udev_device *d) {
Device *device;
int r;
assert(m);
if (streq_ptr(udev_device_get_action(d), "remove")) {
device = hashmap_get(m->devices, udev_device_get_syspath(d));
if (!device)
return 0;
seat_add_to_gc_queue(device->seat);
device_free(device);
} else {
const char *sn;
Seat *seat;
sn = udev_device_get_property_value(d, "ID_SEAT");
if (isempty(sn))
sn = "seat0";
if (!seat_name_is_valid(sn)) {
log_warning("Device with invalid seat name %s found, ignoring.", sn);
return 0;
}
r = manager_add_device(m, udev_device_get_syspath(d), &device);
if (r < 0)
return r;
r = manager_add_seat(m, sn, &seat);
if (r < 0) {
if (!device->seat)
device_free(device);
return r;
}
device_attach(device, seat);
seat_start(seat);
}
return 0;
}
int manager_process_button_device(Manager *m, struct udev_device *d) {
Button *b;
int r;
assert(m);
if (streq_ptr(udev_device_get_action(d), "remove")) {
b = hashmap_get(m->buttons, udev_device_get_sysname(d));
if (!b)
return 0;
button_free(b);
} else {
const char *sn;
r = manager_add_button(m, udev_device_get_sysname(d), &b);
if (r < 0)
return r;
sn = udev_device_get_property_value(d, "ID_SEAT");
if (isempty(sn))
sn = "seat0";
button_set_seat(b, sn);
button_open(b);
}
return 0;
}
int manager_enumerate_devices(Manager *m) {
struct udev_list_entry *item = NULL, *first = NULL;
struct udev_enumerate *e;
int r;
assert(m);
/* Loads devices from udev and creates seats for them as
* necessary */
e = udev_enumerate_new(m->udev);
if (!e) {
r = -ENOMEM;
goto finish;
}
r = udev_enumerate_add_match_tag(e, "master-of-seat");
if (r < 0)
goto finish;
r = udev_enumerate_scan_devices(e);
if (r < 0)
goto finish;
first = udev_enumerate_get_list_entry(e);
udev_list_entry_foreach(item, first) {
struct udev_device *d;
int k;
d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
if (!d) {
r = -ENOMEM;
goto finish;
}
k = manager_process_seat_device(m, d);
udev_device_unref(d);
if (k < 0)
r = k;
}
finish:
if (e)
udev_enumerate_unref(e);
return r;
}
int manager_enumerate_buttons(Manager *m) {
struct udev_list_entry *item = NULL, *first = NULL;
struct udev_enumerate *e;
int r;
assert(m);
/* Loads buttons from udev */
if (m->handle_power_key == HANDLE_IGNORE &&
m->handle_suspend_key == HANDLE_IGNORE &&
m->handle_hibernate_key == HANDLE_IGNORE &&
m->handle_lid_switch == HANDLE_IGNORE)
return 0;
e = udev_enumerate_new(m->udev);
if (!e) {
r = -ENOMEM;
goto finish;
}
r = udev_enumerate_add_match_subsystem(e, "input");
if (r < 0)
goto finish;
r = udev_enumerate_add_match_tag(e, "power-switch");
if (r < 0)
goto finish;
r = udev_enumerate_scan_devices(e);
if (r < 0)
goto finish;
first = udev_enumerate_get_list_entry(e);
udev_list_entry_foreach(item, first) {
struct udev_device *d;
int k;
d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
if (!d) {
r = -ENOMEM;
goto finish;
}
k = manager_process_button_device(m, d);
udev_device_unref(d);
if (k < 0)
r = k;
}
finish:
if (e)
udev_enumerate_unref(e);
return r;
}
int manager_enumerate_seats(Manager *m) {
DIR *d;
struct dirent *de;
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;
log_error("Failed to open /run/systemd/seats: %m");
return -errno;
}
while ((de = readdir(d))) {
Seat *s;
int k;
if (!dirent_is_file(de))
continue;
s = hashmap_get(m->seats, de->d_name);
if (!s) {
unlinkat(dirfd(d), de->d_name, 0);
continue;
}
k = seat_load(s);
if (k < 0)
r = k;
}
closedir(d);
return r;
}
static int manager_enumerate_users_from_cgroup(Manager *m) {
int r = 0, k;
char *name;
DIR *d;
r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d);
if (r < 0) {
if (r == -ENOENT)
return 0;
log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r));
return r;
}
while ((k = cg_read_subgroup(d, &name)) > 0) {
User *user;
k = manager_add_user_by_name(m, name, &user);
if (k < 0) {
free(name);
r = k;
continue;
}
user_add_to_gc_queue(user);
if (!user->cgroup_path)
if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) {
r = -ENOMEM;
free(name);
break;
}
free(name);
}
if (r >= 0 && k < 0)
r = k;
closedir(d);
return r;
}
static int manager_enumerate_linger_users(Manager *m) {
DIR *d;
struct dirent *de;
int r = 0;
d = opendir("/var/lib/systemd/linger");
if (!d) {
if (errno == ENOENT)
return 0;
log_error("Failed to open /var/lib/systemd/linger/: %m");
return -errno;
}
while ((de = readdir(d))) {
int k;
if (!dirent_is_file(de))
continue;
k = manager_add_user_by_name(m, de->d_name, NULL);
if (k < 0) {
log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k));
r = k;
}
}
closedir(d);
return r;
}
int manager_enumerate_users(Manager *m) {
DIR *d;
struct dirent *de;
int r, k;
assert(m);
/* First, enumerate user cgroups */
r = manager_enumerate_users_from_cgroup(m);
/* Second, add lingering users on top */
k = manager_enumerate_linger_users(m);
if (k < 0)
r = k;
/* Third, read in user data stored on disk */
d = opendir("/run/systemd/users");
if (!d) {
if (errno == ENOENT)
return 0;
log_error("Failed to open /run/systemd/users: %m");
return -errno;
}
while ((de = readdir(d))) {
uid_t uid;
User *u;
if (!dirent_is_file(de))
continue;
k = parse_uid(de->d_name, &uid);
if (k < 0) {
log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k));
continue;
}
u = hashmap_get(m->users, ULONG_TO_PTR(uid));
if (!u) {
unlinkat(dirfd(d), de->d_name, 0);
continue;
}
k = user_load(u);
if (k < 0)
r = k;
}
closedir(d);
return r;
}
static int manager_enumerate_sessions_from_cgroup(Manager *m) {
User *u;
Iterator i;
int r = 0;
HASHMAP_FOREACH(u, m->users, i) {
DIR *d;
char *name;
int k;
if (!u->cgroup_path)
continue;
k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d);
if (k < 0) {
if (k == -ENOENT)
continue;
log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k));
r = k;
continue;
}
while ((k = cg_read_subgroup(d, &name)) > 0) {
Session *session;
if (streq(name, "shared"))
continue;
k = manager_add_session(m, u, name, &session);
if (k < 0) {
free(name);
break;
}
session_add_to_gc_queue(session);
if (!session->cgroup_path)
if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) {
k = -ENOMEM;
free(name);
break;
}
free(name);
}
closedir(d);
if (k < 0)
r = k;
}
return r;
}
int manager_enumerate_sessions(Manager *m) {
DIR *d;
struct dirent *de;
int r = 0;
assert(m);
/* First enumerate session cgroups */
r = manager_enumerate_sessions_from_cgroup(m);
/* Second, read in session data stored on disk */
d = opendir("/run/systemd/sessions");
if (!d) {
if (errno == ENOENT)
return 0;
log_error("Failed to open /run/systemd/sessions: %m");
return -errno;
}
while ((de = readdir(d))) {
struct Session *s;
int k;
if (!dirent_is_file(de))
continue;
s = hashmap_get(m->sessions, de->d_name);
if (!s) {
unlinkat(dirfd(d), de->d_name, 0);
continue;
}
k = session_load(s);
if (k < 0)
r = k;
}
closedir(d);
return r;
}
int manager_enumerate_inhibitors(Manager *m) {
DIR *d;
struct dirent *de;
int r = 0;
assert(m);
d = opendir("/run/systemd/inhibit");
if (!d) {
if (errno == ENOENT)
return 0;
log_error("Failed to open /run/systemd/inhibit: %m");
return -errno;
}
while ((de = readdir(d))) {
int k;
Inhibitor *i;
if (!dirent_is_file(de))
continue;
k = manager_add_inhibitor(m, de->d_name, &i);
if (k < 0) {
log_notice("Couldn't add inhibitor %s: %s", de->d_name, strerror(-k));
r = k;
continue;
}
k = inhibitor_load(i);
if (k < 0)
r = k;
}
closedir(d);
return r;
}
int manager_dispatch_seat_udev(Manager *m) {
struct udev_device *d;
int r;
assert(m);
d = udev_monitor_receive_device(m->udev_seat_monitor);
if (!d)
return -ENOMEM;
r = manager_process_seat_device(m, d);
udev_device_unref(d);
return r;
}
int manager_dispatch_vcsa_udev(Manager *m) {
struct udev_device *d;
int r = 0;
const char *name;
assert(m);
d = udev_monitor_receive_device(m->udev_vcsa_monitor);
if (!d)
return -ENOMEM;
name = udev_device_get_sysname(d);
/* Whenever a VCSA device is removed try to reallocate our
* VTs, to make sure our auto VTs never go away. */
if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
r = seat_preallocate_vts(m->vtconsole);
udev_device_unref(d);
return r;
}
int manager_dispatch_button_udev(Manager *m) {
struct udev_device *d;
int r;
assert(m);
d = udev_monitor_receive_device(m->udev_button_monitor);
if (!d)
return -ENOMEM;
r = manager_process_button_device(m, d);
udev_device_unref(d);
return r;
}
int manager_dispatch_console(Manager *m) {
assert(m);
if (m->vtconsole)
seat_read_active_vt(m->vtconsole);
return 0;
}
static int vt_is_busy(int vtnr) {
struct vt_stat vt_stat;
int r = 0, fd;
assert(vtnr >= 1);
/* We explicitly open /dev/tty1 here instead of /dev/tty0. If
* we'd open the latter we'd open the foreground tty which
* hence would be unconditionally busy. By opening /dev/tty1
* we avoid this. Since tty1 is special and needs to be an
* explicitly loaded getty or DM this is safe. */
fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
if (fd < 0)
return -errno;
if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
r = -errno;
else
r = !!(vt_stat.v_state & (1 << vtnr));
close_nointr_nofail(fd);
return r;
}
int manager_spawn_autovt(Manager *m, int vtnr) {
int r;
char *name = NULL;
const char *mode = "fail";
assert(m);
assert(vtnr >= 1);
if ((unsigned) vtnr > m->n_autovts &&
(unsigned) vtnr != m->reserve_vt)
return 0;
if ((unsigned) vtnr != m->reserve_vt) {
/* If this is the reserved TTY, we'll start the getty
* on it in any case, but otherwise only if it is not
* busy. */
r = vt_is_busy(vtnr);
if (r < 0)
return r;
else if (r > 0)
return -EBUSY;
}
if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
log_error("Could not allocate service name.");
r = -ENOMEM;
goto finish;
}
r = bus_method_call_with_reply (
m->bus,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"StartUnit",
NULL,
NULL,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_STRING, &mode,
DBUS_TYPE_INVALID);
finish:
free(name);
return r;
}
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("Failed to pin reserved VT: %m");
return -errno;
}
return 0;
}
int manager_get_session_by_cgroup(Manager *m, const char *cgroup, Session **session) {
Session *s;
char *p;
assert(m);
assert(cgroup);
assert(session);
s = hashmap_get(m->session_cgroups, cgroup);
if (s) {
*session = s;
return 1;
}
p = strdupa(cgroup);
for (;;) {
char *e;
e = strrchr(p, '/');
if (!e || e == p) {
*session = NULL;
return 0;
}
*e = 0;
s = hashmap_get(m->session_cgroups, p);
if (s) {
*session = s;
return 1;
}
}
}
int manager_get_user_by_cgroup(Manager *m, const char *cgroup, User **user) {
User *u;
char *p;
assert(m);
assert(cgroup);
assert(user);
u = hashmap_get(m->user_cgroups, cgroup);
if (u) {
*user = u;
return 1;
}
p = strdupa(cgroup);
if (!p)
return log_oom();
for (;;) {
char *e;
e = strrchr(p, '/');
if (!e || e == p) {
*user = NULL;
return 0;
}
*e = 0;
u = hashmap_get(m->user_cgroups, p);
if (u) {
*user = u;
return 1;
}
}
}
int manager_get_session_by_pid(Manager *m, pid_t pid, Session **session) {
_cleanup_free_ char *p = NULL;
int r;
assert(m);
assert(pid >= 1);
assert(session);
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &p);
if (r < 0)
return r;
return manager_get_session_by_cgroup(m, p, session);
}
void manager_cgroup_notify_empty(Manager *m, const char *cgroup) {
Session *s;
User *u;
int r;
r = manager_get_session_by_cgroup(m, cgroup, &s);
if (r > 0)
session_add_to_gc_queue(s);
r = manager_get_user_by_cgroup(m, cgroup, &u);
if (r > 0)
user_add_to_gc_queue(u);
}
static void manager_dispatch_other(Manager *m, int fd) {
Session *s;
Inhibitor *i;
Button *b;
assert_se(m);
assert_se(fd >= 0);
s = hashmap_get(m->session_fds, INT_TO_PTR(fd + 1));
if (s) {
assert(s->fifo_fd == fd);
session_remove_fifo(s);
session_stop(s);
return;
}
i = hashmap_get(m->inhibitor_fds, INT_TO_PTR(fd + 1));
if (i) {
assert(i->fifo_fd == fd);
inhibitor_stop(i);
inhibitor_free(i);
return;
}
b = hashmap_get(m->button_fds, INT_TO_PTR(fd + 1));
if (b) {
assert(b->fd == fd);
button_process(b);
return;
}
assert_not_reached("Got event for unknown fd");
}
static int manager_connect_bus(Manager *m) {
DBusError error;
int r;
struct epoll_event ev = {
.events = EPOLLIN,
.data.u32 = FD_BUS,
};
assert(m);
assert(!m->bus);
assert(m->bus_fd < 0);
dbus_error_init(&error);
m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
if (!m->bus) {
log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
r = -ECONNREFUSED;
goto fail;
}
if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) ||
!dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) ||
!dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) ||
!dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) ||
!dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) {
r = log_oom();
goto fail;
}
dbus_bus_add_match(m->bus,
"type='signal',"
"interface='org.freedesktop.systemd1.Agent',"
"member='Released',"
"path='/org/freedesktop/systemd1/agent'",
&error);
if (dbus_error_is_set(&error)) {
log_error("Failed to register match: %s", bus_error_message(&error));
r = -EIO;
goto fail;
}
r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
if (dbus_error_is_set(&error)) {
log_error("Failed to register name on bus: %s", bus_error_message(&error));
r = -EIO;
goto fail;
}
if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
log_error("Failed to acquire name.");
r = -EEXIST;
goto fail;
}
m->bus_fd = bus_loop_open(m->bus);
if (m->bus_fd < 0) {
r = m->bus_fd;
goto fail;
}
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0)
goto fail;
return 0;
fail:
dbus_error_free(&error);
return r;
}
static int manager_connect_console(Manager *m) {
struct epoll_event ev = {
.events = 0,
.data.u32 = FD_CONSOLE,
};
assert(m);
assert(m->console_active_fd < 0);
/* On certain architectures (S390 and Xen, and containers),
/dev/tty0 does not exist, so don't fail if we can't open
it. */
if (access("/dev/tty0", F_OK) < 0) {
m->console_active_fd = -1;
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 the device node /dev/tty0 may exist
* even though /sys/class/tty/tty0 does not. */
if (errno == ENOENT)
return 0;
log_error("Failed to open /sys/class/tty/tty0/active: %m");
return -errno;
}
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0)
return -errno;
return 0;
}
static int manager_connect_udev(Manager *m) {
int r;
struct epoll_event ev = {
.events = EPOLLIN,
.data.u32 = FD_SEAT_UDEV,
};
assert(m);
assert(!m->udev_seat_monitor);
assert(!m->udev_vcsa_monitor);
assert(!m->udev_button_monitor);
m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
if (!m->udev_seat_monitor)
return -ENOMEM;
r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "master-of-seat");
if (r < 0)
return r;
r = udev_monitor_enable_receiving(m->udev_seat_monitor);
if (r < 0)
return r;
m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor);
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0)
return -errno;
/* Don't watch keys if nobody cares */
if (m->handle_power_key != HANDLE_IGNORE ||
m->handle_suspend_key != HANDLE_IGNORE ||
m->handle_hibernate_key != HANDLE_IGNORE ||
m->handle_lid_switch != HANDLE_IGNORE) {
m->udev_button_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
if (!m->udev_button_monitor)
return -ENOMEM;
r = udev_monitor_filter_add_match_tag(m->udev_button_monitor, "power-switch");
if (r < 0)
return r;
r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_button_monitor, "input", NULL);
if (r < 0)
return r;
r = udev_monitor_enable_receiving(m->udev_button_monitor);
if (r < 0)
return r;
m->udev_button_fd = udev_monitor_get_fd(m->udev_button_monitor);
zero(ev);
ev.events = EPOLLIN;
ev.data.u32 = FD_BUTTON_UDEV;
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_button_fd, &ev) < 0)
return -errno;
}
/* Don't bother watching VCSA devices, if nobody cares */
if (m->n_autovts > 0 && m->console_active_fd >= 0) {
m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
if (!m->udev_vcsa_monitor)
return -ENOMEM;
r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
if (r < 0)
return r;
r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
if (r < 0)
return r;
m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor);
zero(ev);
ev.events = EPOLLIN;
ev.data.u32 = FD_VCSA_UDEV;
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0)
return -errno;
}
return 0;
}
void manager_gc(Manager *m, bool drop_not_started) {
Seat *seat;
Session *session;
User *user;
assert(m);
while ((seat = m->seat_gc_queue)) {
LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat);
seat->in_gc_queue = false;
if (seat_check_gc(seat, drop_not_started) == 0) {
seat_stop(seat);
seat_free(seat);
}
}
while ((session = m->session_gc_queue)) {
LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session);
session->in_gc_queue = false;
if (session_check_gc(session, drop_not_started) == 0) {
session_stop(session);
session_free(session);
}
}
while ((user = m->user_gc_queue)) {
LIST_REMOVE(User, gc_queue, m->user_gc_queue, user);
user->in_gc_queue = false;
if (user_check_gc(user, drop_not_started) == 0) {
user_stop(user);
user_free(user);
}
}
}
int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
Session *s;
bool idle_hint;
dual_timestamp ts = { 0, 0 };
Iterator i;
assert(m);
idle_hint = !manager_is_inhibited(m, INHIBIT_IDLE, INHIBIT_BLOCK, t, false, false, 0);
HASHMAP_FOREACH(s, m->sessions, i) {
dual_timestamp k;
int ih;
ih = session_get_idle_hint(s, &k);
if (ih < 0)
return ih;
if (!ih) {
if (!idle_hint) {
if (k.monotonic < ts.monotonic)
ts = k;
} else {
idle_hint = false;
ts = k;
}
} else if (idle_hint) {
if (k.monotonic > ts.monotonic)
ts = k;
}
}
if (t)
*t = ts;
return idle_hint;
}
int manager_dispatch_idle_action(Manager *m) {
struct dual_timestamp since;
struct itimerspec its = {};
int r;
usec_t n;
assert(m);
if (m->idle_action == HANDLE_IGNORE ||
m->idle_action_usec <= 0) {
r = 0;
goto finish;
}
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. */
timespec_store(&its.it_value, n + m->idle_action_usec);
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)) {
log_info("System idle. Taking action.");
manager_handle_action(m, 0, m->idle_action, false, false);
m->idle_action_not_before_usec = n;
}
timespec_store(&its.it_value, MAX(since.monotonic, m->idle_action_not_before_usec) + m->idle_action_usec);
}
if (m->idle_action_fd < 0) {
struct epoll_event ev = {
.events = EPOLLIN,
.data.u32 = FD_IDLE_ACTION,
};
m->idle_action_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC);
if (m->idle_action_fd < 0) {
log_error("Failed to create idle action timer: %m");
r = -errno;
goto finish;
}
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->idle_action_fd, &ev) < 0) {
log_error("Failed to add idle action timer to epoll: %m");
r = -errno;
goto finish;
}
}
if (timerfd_settime(m->idle_action_fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) {
log_error("Failed to reset timerfd: %m");
r = -errno;
goto finish;
}
return 0;
finish:
if (m->idle_action_fd >= 0) {
close_nointr_nofail(m->idle_action_fd);
m->idle_action_fd = -1;
}
return r;
}
int manager_startup(Manager *m) {
int r;
Seat *seat;
Session *session;
User *user;
Inhibitor *inhibitor;
Iterator i;
assert(m);
assert(m->epoll_fd <= 0);
cg_shorten_controllers(m->reset_controllers);
cg_shorten_controllers(m->controllers);
m->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
if (m->epoll_fd < 0)
return -errno;
/* 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 r;
/* 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->vtconsole);
if (r < 0)
return r;
/* Deserialize state */
manager_enumerate_devices(m);
manager_enumerate_seats(m);
manager_enumerate_users(m);
manager_enumerate_sessions(m);
manager_enumerate_inhibitors(m);
manager_enumerate_buttons(m);
/* Remove stale objects before we start them */
manager_gc(m, false);
/* Reserve the special reserved VT */
manager_reserve_vt(m);
/* And start everything */
HASHMAP_FOREACH(seat, m->seats, i)
seat_start(seat);
HASHMAP_FOREACH(user, m->users, i)
user_start(user);
HASHMAP_FOREACH(session, m->sessions, i)
session_start(session);
HASHMAP_FOREACH(inhibitor, m->inhibitors, i)
inhibitor_start(inhibitor);
manager_dispatch_idle_action(m);
return 0;
}
static int manager_recheck_buttons(Manager *m) {
Iterator i;
Button *b;
int r = 0;
assert(m);
HASHMAP_FOREACH(b, m->buttons, i) {
int q;
q = button_recheck(b);
if (q > 0)
return 1;
if (q < 0)
r = q;
}
return r;
}
int manager_run(Manager *m) {
assert(m);
for (;;) {
struct epoll_event event;
int n;
int msec = -1;
manager_gc(m, true);
if (manager_dispatch_delayed(m) > 0)
continue;
if (manager_recheck_buttons(m) > 0)
continue;
if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
continue;
manager_gc(m, true);
if (m->action_what != 0) {
usec_t x, y;
x = now(CLOCK_MONOTONIC);
y = m->action_timestamp + m->inhibit_delay_max;
msec = x >= y ? 0 : (int) ((y - x) / USEC_PER_MSEC);
}
n = epoll_wait(m->epoll_fd, &event, 1, msec);
if (n < 0) {
if (errno == EINTR || errno == EAGAIN)
continue;
log_error("epoll() failed: %m");
return -errno;
}
if (n == 0)
continue;
switch (event.data.u32) {
case FD_SEAT_UDEV:
manager_dispatch_seat_udev(m);
break;
case FD_VCSA_UDEV:
manager_dispatch_vcsa_udev(m);
break;
case FD_BUTTON_UDEV:
manager_dispatch_button_udev(m);
break;
case FD_CONSOLE:
manager_dispatch_console(m);
break;
case FD_IDLE_ACTION:
manager_dispatch_idle_action(m);
break;
case FD_BUS:
bus_loop_dispatch(m->bus_fd);
break;
default:
if (event.data.u32 >= FD_OTHER_BASE)
manager_dispatch_other(m, event.data.u32 - FD_OTHER_BASE);
}
}
return 0;
}
static int manager_parse_config_file(Manager *m) {
FILE *f;
const char *fn;
int r;
assert(m);
fn = "/etc/systemd/logind.conf";
f = fopen(fn, "re");
if (!f) {
if (errno == ENOENT)
return 0;
log_warning("Failed to open configuration file %s: %m", fn);
return -errno;
}
r = config_parse(NULL, fn, f, "Login\0", config_item_perf_lookup, (void*) logind_gperf_lookup, false, m);
if (r < 0)
log_warning("Failed to parse configuration file: %s", strerror(-r));
fclose(f);
return r;
}
int main(int argc, char *argv[]) {
Manager *m = NULL;
int r;
log_set_target(LOG_TARGET_AUTO);
log_set_facility(LOG_AUTH);
log_parse_environment();
log_open();
umask(0022);
if (argc != 1) {
log_error("This program takes no arguments.");
r = -EINVAL;
goto finish;
}
/* 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 this check
* stays in. */
mkdir_label("/run/systemd/seats", 0755);
mkdir_label("/run/systemd/users", 0755);
mkdir_label("/run/systemd/sessions", 0755);
m = manager_new();
if (!m) {
r = log_oom();
goto finish;
}
manager_parse_config_file(m);
r = manager_startup(m);
if (r < 0) {
log_error("Failed to fully start up daemon: %s", strerror(-r));
goto finish;
}
log_debug("systemd-logind running as pid %lu", (unsigned long) getpid());
sd_notify(false,
"READY=1\n"
"STATUS=Processing requests...");
r = manager_run(m);
log_debug("systemd-logind stopped as pid %lu", (unsigned long) getpid());
finish:
sd_notify(false,
"STATUS=Shutting down...");
if (m)
manager_free(m);
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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