logind-core.c revision 92bd5ff3a062c3f9475b9d9d39b9335bfeb7705e
/*-*- 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 <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <pwd.h>
#include <unistd.h>
#include <linux/vt.h>
#include "strv.h"
#include "cgroup-util.h"
#include "audit.h"
#include "bus-util.h"
#include "bus-error.h"
#include "logind.h"
int manager_add_device(Manager *m, const char *sysfs, bool master, Device **_device) {
Device *d;
assert(m);
assert(sysfs);
d = hashmap_get(m->devices, sysfs);
if (d) {
if (_device)
*_device = d;
/* we support adding master-flags, but not removing them */
d->master = d->master || master;
return 0;
}
d = device_new(m, sysfs, master);
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, 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, 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_watch_busname(Manager *m, const char *name) {
char *n;
int r;
assert(m);
assert(name);
if (set_get(m->busnames, (char*) name))
return 0;
n = strdup(name);
if (!n)
return -ENOMEM;
r = set_put(m->busnames, n);
if (r < 0) {
free(n);
return r;
}
return 0;
}
void manager_drop_busname(Manager *m, const char *name) {
Session *session;
Iterator i;
assert(m);
assert(name);
/* keep it if the name still owns a controller */
HASHMAP_FOREACH(session, m->sessions, i)
if (session_is_controller(session, name))
return;
free(set_remove(m->busnames, (char*) name));
}
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 = NULL;
bool master;
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;
}
/* ignore non-master devices for unknown seats */
master = udev_device_has_tag(d, "master-of-seat");
if (!master && !(seat = hashmap_get(m->seats, sn)))
return 0;
r = manager_add_device(m, udev_device_get_syspath(d), master, &device);
if (r < 0)
return r;
if (!seat) {
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_get_session_by_pid(Manager *m, pid_t pid, Session **session) {
_cleanup_free_ char *unit = NULL;
Session *s;
int r;
assert(m);
assert(session);
if (pid < 1)
return -EINVAL;
r = cg_pid_get_unit(pid, &unit);
if (r < 0)
return 0;
s = hashmap_get(m->session_units, unit);
if (!s)
return 0;
*session = s;
return 1;
}
int manager_get_user_by_pid(Manager *m, pid_t pid, User **user) {
_cleanup_free_ char *unit = NULL;
User *u;
int r;
assert(m);
assert(user);
if (pid < 1)
return -EINVAL;
r = cg_pid_get_slice(pid, &unit);
if (r < 0)
return 0;
u = hashmap_get(m->user_units, unit);
if (!u)
return 0;
*user = u;
return 1;
}
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, NULL);
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;
}
bool manager_shall_kill(Manager *m, const char *user) {
assert(m);
assert(user);
if (!m->kill_user_processes)
return false;
if (strv_contains(m->kill_exclude_users, user))
return false;
if (strv_isempty(m->kill_only_users))
return true;
return strv_contains(m->kill_only_users, user);
}
static int vt_is_busy(unsigned 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, unsigned int vtnr) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_free_ char *name = NULL;
int r;
assert(m);
assert(vtnr >= 1);
if (vtnr > m->n_autovts &&
vtnr != m->reserve_vt)
return 0;
if (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%u.service", vtnr) < 0)
return log_oom();
r = sd_bus_call_method(
m->bus,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"StartUnit",
&error,
NULL,
"ss", name, "fail");
if (r < 0)
log_error("Failed to start %s: %s", name, bus_error_message(&error, r));
return r;
}