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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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#include <sys/ioctl.h>
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#include "logind-seat.h"
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#include "logind-acl.h"
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Seat *seat_new(Manager *m, const char *id) {
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s->state_file = strappend("/run/systemd/seats/", id);
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s->id = file_name_from_path(s->state_file);
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if (hashmap_put(m->seats, s->id, s) < 0) {
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void seat_free(Seat *s) {
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LIST_REMOVE(Seat, gc_queue, s->manager->seat_gc_queue, s);
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session_free(s->sessions);
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device_free(s->devices);
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hashmap_remove(s->manager->seats, s->id);
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int seat_save(Seat *s) {
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r = safe_mkdir("/run/systemd/seats", 0755, 0, 0);
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r = fopen_temporary(s->state_file, &f, &temp_path);
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fchmod(fileno(f), 0644);
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"# This is private data. Do not parse.\n"
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"CAN_MULTI_SESSION=%i\n",
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seat_is_vtconsole(s),
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seat_can_multi_session(s));
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assert(s->active->user);
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(unsigned long) s->active->user->uid);
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fputs("SESSIONS=", f);
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LIST_FOREACH(sessions_by_seat, i, s->sessions) {
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i->sessions_by_seat_next ? ' ' : '\n');
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LIST_FOREACH(sessions_by_seat, i, s->sessions)
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(unsigned long) i->user->uid,
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i->sessions_by_seat_next ? ' ' : '\n');
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if (ferror(f) || rename(temp_path, s->state_file) < 0) {
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unlink(s->state_file);
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log_error("Failed to save seat data for %s: %s", s->id, strerror(-r));
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int seat_load(Seat *s) {
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/* There isn't actually anything to read here ... */
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static int vt_allocate(int vtnr) {
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if (asprintf(&p, "/dev/tty%i", vtnr) < 0)
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fd = open_terminal(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
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r = fd < 0 ? -errno : 0;
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close_nointr_nofail(fd);
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int seat_preallocate_vts(Seat *s) {
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log_debug("Preallocating VTs...");
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if (s->manager->n_autovts <= 0)
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if (!seat_can_multi_session(s))
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for (i = 1; i <= s->manager->n_autovts; i++) {
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log_error("Failed to preallocate VT %i: %s", i, strerror(-q));
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int seat_apply_acls(Seat *s, Session *old_active) {
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r = devnode_acl_all(s->manager->udev,
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!!old_active, old_active ? old_active->user->uid : 0,
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!!s->active, s->active ? s->active->user->uid : 0);
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log_error("Failed to apply ACLs: %s", strerror(-r));
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int seat_set_active(Seat *s, Session *session) {
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assert(!session || session->seat == s);
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if (session == s->active)
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old_active = s->active;
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seat_apply_acls(s, old_active);
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if (session && session->started)
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session_send_changed(session, "Active\0");
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if (!session || session->started)
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seat_send_changed(s, "ActiveSession\0");
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session_save(session);
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user_save(session->user);
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session_save(old_active);
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user_save(old_active->user);
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int seat_active_vt_changed(Seat *s, int vtnr) {
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Session *i, *new_active = NULL;
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if (!seat_can_multi_session(s))
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log_debug("VT changed to %i", vtnr);
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LIST_FOREACH(sessions_by_seat, i, s->sessions)
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if (i->vtnr == vtnr) {
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r = seat_set_active(s, new_active);
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manager_spawn_autovt(s->manager, vtnr);
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int seat_read_active_vt(Seat *s) {
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if (!seat_can_multi_session(s))
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lseek(s->manager->console_active_fd, SEEK_SET, 0);
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k = read(s->manager->console_active_fd, t, sizeof(t)-1);
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log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF");
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return k < 0 ? -errno : -EIO;
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if (!startswith(t, "tty")) {
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log_error("Hm, /sys/class/tty/tty0/active is badly formatted.");
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r = safe_atoi(t+3, &vtnr);
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log_error("Failed to parse VT number %s", t+3);
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log_error("VT number invalid: %s", t+3);
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return seat_active_vt_changed(s, vtnr);
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int seat_start(Seat *s) {
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log_info("New seat %s.", s->id);
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/* Initialize VT magic stuff */
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seat_preallocate_vts(s);
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/* Read current VT */
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seat_read_active_vt(s);
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seat_send_signal(s, true);
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int seat_stop(Seat *s) {
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log_info("Removed seat %s.", s->id);
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seat_stop_sessions(s);
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unlink(s->state_file);
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seat_add_to_gc_queue(s);
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seat_send_signal(s, false);
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int seat_stop_sessions(Seat *s) {
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LIST_FOREACH(sessions_by_seat, session, s->sessions) {
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k = session_stop(session);
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int seat_attach_session(Seat *s, Session *session) {
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assert(!session->seat);
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LIST_PREPEND(Session, sessions_by_seat, s->sessions, session);
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seat_send_changed(s, "Sessions\0");
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/* Note that even if a seat is not multi-session capable it
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* still might have multiple sessions on it since old, dead
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* sessions might continue to be tracked until all their
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* processes are gone. The most recently added session
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* (i.e. the first in s->sessions) is the one that matters. */
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if (!seat_can_multi_session(s))
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seat_set_active(s, session);
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bool seat_is_vtconsole(Seat *s) {
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return s->manager->vtconsole == s;
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bool seat_can_multi_session(Seat *s) {
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if (!seat_is_vtconsole(s))
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/* If we can't watch which VT is in the foreground, we don't
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* support VT switching */
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return s->manager->console_active_fd >= 0;
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int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
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bool idle_hint = true;
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dual_timestamp ts = { 0, 0 };
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LIST_FOREACH(sessions_by_seat, session, s->sessions) {
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ih = session_get_idle_hint(session, &k);
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if (k.monotonic < ts.monotonic)
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} else if (idle_hint) {
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if (k.monotonic > ts.monotonic)
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int seat_check_gc(Seat *s, bool drop_not_started) {
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if (drop_not_started && !s->started)
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if (seat_is_vtconsole(s))
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void seat_add_to_gc_queue(Seat *s) {
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LIST_PREPEND(Seat, gc_queue, s->manager->seat_gc_queue, s);
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s->in_gc_queue = true;
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static bool seat_name_valid_char(char c) {
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(c >= 'a' && c <= 'z') ||
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(c >= 'A' && c <= 'Z') ||
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(c >= '0' && c <= '9') ||
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bool seat_name_is_valid(const char *name) {
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if (!startswith(name, "seat"))
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for (p = name; *p; p++)
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if (!seat_name_valid_char(*p))
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if (strlen(name) > 255)