picnoir
/
Systemd
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
Systemd/src/login/logind.c

1640 lines
43 KiB
C
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 <systemd/sd-daemon.h>
#include "logind.h"
#include "dbus-common.h"
#include "dbus-loop.h"
#include "strv.h"
#include "conf-parser.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->n_autovts = 6;
m->inhibit_delay_max = 5 * USEC_PER_SEC;
m->handle_power_key = HANDLE_NO_SESSION;
m->handle_sleep_key = HANDLE_TTY_SESSION;
m->handle_lid_switch = HANDLE_OFF;
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);
strv_free(m->controllers);
strv_free(m->reset_controllers);
strv_free(m->kill_only_users);
strv_free(m->kill_exclude_users);
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_subsystem(e, "graphics");
if (r < 0)
goto finish;
r = udev_enumerate_add_match_tag(e, "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_OFF &&
m->handle_sleep_key == HANDLE_OFF &&
m->handle_lid_switch == HANDLE_OFF)
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;
DBusMessage *message = NULL, *reply = NULL;
char *name = NULL;
const char *mode = "fail";
DBusError error;
assert(m);
assert(vtnr >= 1);
dbus_error_init(&error);
if ((unsigned) vtnr > m->n_autovts)
return 0;
r = vt_is_busy(vtnr);
if (r < 0)
return r;
else if (r > 0)
return -EBUSY;
message = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit");
if (!message) {
log_error("Could not allocate message.");
r = -ENOMEM;
goto finish;
}
if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) {
log_error("Could not allocate service name.");
r = -ENOMEM;
goto finish;
}
if (!dbus_message_append_args(message,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_STRING, &mode,
DBUS_TYPE_INVALID)) {
log_error("Could not attach target and flag information to message.");
r = -ENOMEM;
goto finish;
}
reply = dbus_connection_send_with_reply_and_block(m->bus, message, -1, &error);
if (!reply) {
log_error("Failed to start unit: %s", bus_error_message(&error));
goto finish;
}
r = 0;
finish:
free(name);
if (message)
dbus_message_unref(message);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
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 = strdup(cgroup);
if (!p)
return log_oom();
for (;;) {
char *e;
e = strrchr(p, '/');
if (!e || e == p) {
free(p);
*session = NULL;
return 0;
}
*e = 0;
s = hashmap_get(m->session_cgroups, p);
if (s) {
free(p);
*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 = strdup(cgroup);
if (!p)
return log_oom();
for (;;) {
char *e;
e = strrchr(p, '/');
if (!e || e == p) {
free(p);
*user = NULL;
return 0;
}
*e = 0;
u = hashmap_get(m->user_cgroups, p);
if (u) {
free(p);
*user = u;
return 1;
}
}
}
int manager_get_session_by_pid(Manager *m, pid_t pid, Session **session) {
char *p;
int r;
assert(m);
assert(pid >= 1);
assert(session);
r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &p);
if (r < 0)
return r;
r = manager_get_session_by_cgroup(m, p, session);
free(p);
return r;
}
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;
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;
}
zero(ev);
ev.events = EPOLLIN;
ev.data.u32 = FD_BUS;
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;
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;
}
zero(ev);
ev.events = 0;
ev.data.u32 = FD_CONSOLE;
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) {
struct epoll_event ev;
int r;
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, "seat");
if (r < 0)
return r;
r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL);
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);
zero(ev);
ev.events = EPOLLIN;
ev.data.u32 = FD_SEAT_UDEV;
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_OFF ||
m->handle_sleep_key != HANDLE_OFF ||
m->handle_lid_switch != HANDLE_OFF) {
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);
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_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);
/* 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);
return 0;
}
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 (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE)
continue;
manager_gc(m, true);
if (m->delayed_unit) {
usec_t x, y;
x = now(CLOCK_MONOTONIC);
y = m->delayed_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_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(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;
}
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;
}
Reference in New Issue View Git Blame Copy Permalink