1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/epoll.h>
28 #include "logind-session.h"
31 #include "cgroup-util.h"
33 #define IDLE_THRESHOLD_USEC (5*USEC_PER_MINUTE)
35 Session* session_new(Manager *m, User *u, const char *id) {
45 s->state_file = strappend("/run/systemd/sessions/", id);
51 s->id = file_name_from_path(s->state_file);
53 if (hashmap_put(m->sessions, s->id, s) < 0) {
63 LIST_PREPEND(Session, sessions_by_user, u->sessions, s);
68 void session_free(Session *s) {
72 LIST_REMOVE(Session, gc_queue, s->manager->session_gc_queue, s);
75 LIST_REMOVE(Session, sessions_by_user, s->user->sessions, s);
77 if (s->user->display == s)
78 s->user->display = NULL;
82 if (s->seat->active == s)
83 s->seat->active = NULL;
85 LIST_REMOVE(Session, sessions_by_seat, s->seat->sessions, s);
89 hashmap_remove(s->manager->cgroups, s->cgroup_path);
92 strv_free(s->controllers);
100 hashmap_remove(s->manager->sessions, s->id);
102 session_remove_fifo(s);
108 int session_save(Session *s) {
118 r = safe_mkdir("/run/systemd/sessions", 0755, 0, 0);
122 r = fopen_temporary(s->state_file, &f, &temp_path);
128 fchmod(fileno(f), 0644);
131 "# This is private data. Do not parse.\n"
136 "KILL_PROCESSES=%i\n",
137 (unsigned long) s->user->uid,
139 session_is_active(s),
146 session_type_to_string(s->type));
188 if (s->seat && seat_is_vtconsole(s->seat))
196 (unsigned long) s->leader);
201 (unsigned long long) s->audit_id);
205 if (ferror(f) || rename(temp_path, s->state_file) < 0) {
207 unlink(s->state_file);
216 log_error("Failed to save session data for %s: %s", s->id, strerror(-r));
221 int session_load(Session *s) {
223 *kill_processes = NULL,
234 r = parse_env_file(s->state_file, NEWLINE,
236 "KILL_PROCESSES", &kill_processes,
237 "CGROUP", &s->cgroup_path,
238 "FIFO", &s->fifo_path,
241 "DISPLAY", &s->display,
242 "REMOTE_HOST", &s->remote_host,
243 "REMOTE_USER", &s->remote_user,
244 "SERVICE", &s->service,
254 k = parse_boolean(remote);
259 if (kill_processes) {
260 k = parse_boolean(kill_processes);
262 s->kill_processes = k;
265 if (seat && !s->seat) {
268 o = hashmap_get(s->manager->seats, seat);
270 seat_attach_session(o, s);
273 if (vtnr && s->seat && seat_is_vtconsole(s->seat)) {
276 k = safe_atoi(vtnr, &v);
277 if (k >= 0 && v >= 1)
284 k = parse_pid(leader, &pid);
285 if (k >= 0 && pid >= 1) {
288 audit_session_from_pid(pid, &s->audit_id);
295 t = session_type_from_string(type);
300 session_open_fifo(s);
304 free(kill_processes);
313 int session_activate(Session *s) {
325 if (s->seat->active == s)
328 assert(seat_is_vtconsole(s->seat));
334 old_active = s->seat->active;
337 return seat_apply_acls(s->seat, old_active);
340 static int session_link_x11_socket(Session *s) {
346 assert(s->user->runtime_path);
348 if (s->user->display)
351 if (!s->display || !display_is_local(s->display))
354 k = strspn(s->display+1, "0123456789");
355 f = new(char, sizeof("/tmp/.X11-unix/X") + k);
357 log_error("Out of memory");
361 c = stpcpy(f, "/tmp/.X11-unix/X");
362 memcpy(c, s->display+1, k);
365 if (access(f, F_OK) < 0) {
366 log_warning("Session %s has display %s with nonexisting socket %s.", s->id, s->display, f);
371 t = strappend(s->user->runtime_path, "/display");
373 log_error("Out of memory");
378 if (link(f, t) < 0) {
379 if (errno == EEXIST) {
386 if (symlink(f, t) < 0) {
388 if (errno == EEXIST) {
391 if (symlink(f, t) >= 0)
395 log_error("Failed to link %s to %s: %m", f, t);
403 log_info("Linked %s to %s.", f, t);
407 s->user->display = s;
412 static int session_create_one_group(Session *s, const char *controller, const char *path) {
420 r = cg_create_and_attach(controller, path, s->leader);
422 r = cg_create(controller, path);
424 r = cg_create(controller, path);
429 r = cg_set_task_access(controller, path, 0644, s->user->uid, s->user->gid);
431 r = cg_set_group_access(controller, path, 0755, s->user->uid, s->user->gid);
436 static int session_create_cgroup(Session *s) {
443 assert(s->user->cgroup_path);
445 if (!s->cgroup_path) {
446 if (asprintf(&p, "%s/%s", s->user->cgroup_path, s->id) < 0) {
447 log_error("Out of memory");
453 r = session_create_one_group(s, SYSTEMD_CGROUP_CONTROLLER, p);
455 log_error("Failed to create "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r));
457 s->cgroup_path = NULL;
463 STRV_FOREACH(k, s->controllers) {
465 if (strv_contains(s->reset_controllers, *k))
468 r = session_create_one_group(s, *k, p);
470 log_warning("Failed to create %s:%s: %s", *k, p, strerror(-r));
473 STRV_FOREACH(k, s->manager->controllers) {
475 if (strv_contains(s->reset_controllers, *k) ||
476 strv_contains(s->manager->reset_controllers, *k) ||
477 strv_contains(s->controllers, *k))
480 r = session_create_one_group(s, *k, p);
482 log_warning("Failed to create %s:%s: %s", *k, p, strerror(-r));
487 STRV_FOREACH(k, s->reset_controllers) {
488 r = cg_attach(*k, "/", s->leader);
490 log_warning("Failed to reset controller %s: %s", *k, strerror(-r));
494 STRV_FOREACH(k, s->manager->reset_controllers) {
496 if (strv_contains(s->reset_controllers, *k) ||
497 strv_contains(s->controllers, *k))
500 r = cg_attach(*k, "/", s->leader);
502 log_warning("Failed to reset controller %s: %s", *k, strerror(-r));
507 hashmap_put(s->manager->cgroups, s->cgroup_path, s);
512 int session_start(Session *s) {
521 r = user_start(s->user);
525 log_info("New session %s of user %s.", s->id, s->user->name);
528 r = session_create_cgroup(s);
532 /* Create X11 symlink */
533 session_link_x11_socket(s);
535 dual_timestamp_get(&s->timestamp);
538 seat_read_active_vt(s->seat);
542 /* Save session data */
546 session_send_signal(s, true);
551 if (s->seat->active == s)
552 seat_send_changed(s->seat, "Sessions\0ActiveSession\0");
554 seat_send_changed(s->seat, "Sessions\0");
557 user_send_changed(s->user, "Sessions\0");
562 static bool session_shall_kill(Session *s) {
565 if (!s->kill_processes)
568 if (strv_contains(s->manager->kill_exclude_users, s->user->name))
571 if (strv_isempty(s->manager->kill_only_users))
574 return strv_contains(s->manager->kill_only_users, s->user->name);
577 static int session_kill_cgroup(Session *s) {
586 cg_trim(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, false);
588 if (session_shall_kill(s)) {
590 r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, true);
592 log_error("Failed to kill session cgroup: %s", strerror(-r));
595 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, true);
597 log_error("Failed to check session cgroup: %s", strerror(-r));
599 r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path);
601 log_error("Failed to delete session cgroup: %s", strerror(-r));
606 STRV_FOREACH(k, s->user->manager->controllers)
607 cg_trim(*k, s->cgroup_path, true);
609 hashmap_remove(s->manager->cgroups, s->cgroup_path);
611 free(s->cgroup_path);
612 s->cgroup_path = NULL;
617 static int session_unlink_x11_socket(Session *s) {
624 if (s->user->display != s)
627 s->user->display = NULL;
629 t = strappend(s->user->runtime_path, "/display");
631 log_error("Out of memory");
638 return r < 0 ? -errno : 0;
641 int session_stop(Session *s) {
647 log_info("Removed session %s.", s->id);
650 k = session_kill_cgroup(s);
654 /* Remove X11 symlink */
655 session_unlink_x11_socket(s);
657 unlink(s->state_file);
658 session_add_to_gc_queue(s);
659 user_add_to_gc_queue(s->user);
662 session_send_signal(s, false);
665 if (s->seat->active == s)
666 seat_set_active(s->seat, NULL);
668 seat_send_changed(s->seat, "Sessions\0");
671 user_send_changed(s->user, "Sessions\0");
678 bool session_is_active(Session *s) {
684 return s->seat->active == s;
687 int session_get_idle_hint(Session *s, dual_timestamp *t) {
698 *t = s->idle_hint_timestamp;
706 if (s->tty[0] != '/') {
707 p = strappend("/dev/", s->tty);
713 if (!startswith(p ? p : s->tty, "/dev/")) {
718 k = lstat(p ? p : s->tty, &st);
724 u = timespec_load(&st.st_atim);
725 n = now(CLOCK_REALTIME);
726 b = u + IDLE_THRESHOLD_USEC < n;
729 dual_timestamp_from_realtime(t, u + b ? IDLE_THRESHOLD_USEC : 0);
735 *t = s->idle_hint_timestamp;
740 void session_set_idle_hint(Session *s, bool b) {
743 if (s->idle_hint == b)
747 dual_timestamp_get(&s->idle_hint_timestamp);
749 session_send_changed(s,
752 "IdleSinceHintMonotonic\0");
755 seat_send_changed(s->seat,
758 "IdleSinceHintMonotonic\0");
760 user_send_changed(s->user,
763 "IdleSinceHintMonotonic\0");
765 manager_send_changed(s->manager,
768 "IdleSinceHintMonotonic\0");
771 int session_open_fifo(Session *s) {
772 struct epoll_event ev;
783 s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
787 r = hashmap_put(s->manager->fifo_fds, INT_TO_PTR(s->fifo_fd + 1), s);
793 ev.data.u32 = FD_FIFO_BASE + s->fifo_fd;
795 if (epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_ADD, s->fifo_fd, &ev) < 0)
801 int session_create_fifo(Session *s) {
807 if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0)
810 if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST)
814 /* Open reading side */
815 r = session_open_fifo(s);
819 /* Open writing side */
820 r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY);
827 void session_remove_fifo(Session *s) {
830 if (s->fifo_fd >= 0) {
831 assert_se(hashmap_remove(s->manager->fifo_fds, INT_TO_PTR(s->fifo_fd + 1)) == s);
832 assert_se(epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_DEL, s->fifo_fd, NULL) == 0);
833 close_nointr_nofail(s->fifo_fd);
838 unlink(s->fifo_path);
844 int session_check_gc(Session *s) {
852 if (s->fifo_fd >= 0) {
854 r = pipe_eof(s->fifo_fd);
862 if (s->cgroup_path) {
864 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, false);
875 void session_add_to_gc_queue(Session *s) {
881 LIST_PREPEND(Session, gc_queue, s->manager->session_gc_queue, s);
882 s->in_gc_queue = true;
885 static const char* const session_type_table[_SESSION_TYPE_MAX] = {
886 [SESSION_TTY] = "tty",
887 [SESSION_X11] = "x11",
888 [SESSION_UNSPECIFIED] = "unspecified"
891 DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType);