+++ /dev/null
-/*-*- 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 General Public License as published by
- the Free Software Foundation; either version 2 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
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <assert.h>
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/ioctl.h>
-#include <linux/vt.h>
-#include <string.h>
-
-#include "logind-seat.h"
-#include "logind-acl.h"
-#include "util.h"
-
-Seat *seat_new(Manager *m, const char *id) {
- Seat *s;
-
- assert(m);
- assert(id);
-
- s = new0(Seat, 1);
- if (!s)
- return NULL;
-
- s->state_file = strappend("/run/systemd/seats/", id);
- if (!s->state_file) {
- free(s);
- return NULL;
- }
-
- s->id = file_name_from_path(s->state_file);
- s->manager = m;
-
- if (hashmap_put(m->seats, s->id, s) < 0) {
- free(s->state_file);
- free(s);
- return NULL;
- }
-
- return s;
-}
-
-void seat_free(Seat *s) {
- assert(s);
-
- if (s->in_gc_queue)
- LIST_REMOVE(Seat, gc_queue, s->manager->seat_gc_queue, s);
-
- while (s->sessions)
- session_free(s->sessions);
-
- assert(!s->active);
-
- while (s->devices)
- device_free(s->devices);
-
- hashmap_remove(s->manager->seats, s->id);
-
- free(s->state_file);
- free(s);
-}
-
-int seat_save(Seat *s) {
- int r;
- FILE *f;
- char *temp_path;
-
- assert(s);
-
- if (!s->started)
- return 0;
-
- r = safe_mkdir("/run/systemd/seats", 0755, 0, 0);
- if (r < 0)
- goto finish;
-
- r = fopen_temporary(s->state_file, &f, &temp_path);
- if (r < 0)
- goto finish;
-
- fchmod(fileno(f), 0644);
-
- fprintf(f,
- "# This is private data. Do not parse.\n"
- "IS_VTCONSOLE=%i\n",
- seat_is_vtconsole(s));
-
- if (s->active) {
- assert(s->active->user);
-
- fprintf(f,
- "ACTIVE=%s\n"
- "ACTIVE_UID=%lu\n",
- s->active->id,
- (unsigned long) s->active->user->uid);
- }
-
- if (s->sessions) {
- Session *i;
-
- fputs("SESSIONS=", f);
- LIST_FOREACH(sessions_by_seat, i, s->sessions) {
- fprintf(f,
- "%s%c",
- i->id,
- i->sessions_by_seat_next ? ' ' : '\n');
- }
-
- fputs("UIDS=", f);
- LIST_FOREACH(sessions_by_seat, i, s->sessions)
- fprintf(f,
- "%lu%c",
- (unsigned long) i->user->uid,
- i->sessions_by_seat_next ? ' ' : '\n');
- }
-
- fflush(f);
-
- if (ferror(f) || rename(temp_path, s->state_file) < 0) {
- r = -errno;
- unlink(s->state_file);
- unlink(temp_path);
- }
-
- fclose(f);
- free(temp_path);
-
-finish:
- if (r < 0)
- log_error("Failed to save seat data for %s: %s", s->id, strerror(-r));
-
- return r;
-}
-
-int seat_load(Seat *s) {
- assert(s);
-
- /* There isn't actually anything to read here ... */
-
- return 0;
-}
-
-static int vt_allocate(int vtnr) {
- int fd, r;
- char *p;
-
- assert(vtnr >= 1);
-
- if (asprintf(&p, "/dev/tty%i", vtnr) < 0)
- return -ENOMEM;
-
- fd = open_terminal(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
- free(p);
-
- r = fd < 0 ? -errno : 0;
-
- if (fd >= 0)
- close_nointr_nofail(fd);
-
- return r;
-}
-
-int seat_preallocate_vts(Seat *s) {
- int r = 0;
- unsigned i;
-
- assert(s);
- assert(s->manager);
-
- log_debug("Preallocating VTs...");
-
- if (s->manager->n_autovts <= 0)
- return 0;
-
- if (!seat_is_vtconsole(s))
- return 0;
-
- for (i = 1; i <= s->manager->n_autovts; i++) {
- int q;
-
- q = vt_allocate(i);
- if (q < 0) {
- log_error("Failed to preallocate VT %i: %s", i, strerror(-q));
- r = q;
- }
- }
-
- return r;
-}
-
-int seat_apply_acls(Seat *s, Session *old_active) {
- int r;
-
- assert(s);
-
- r = devnode_acl_all(s->manager->udev,
- s->id,
- false,
- !!old_active, old_active ? old_active->user->uid : 0,
- !!s->active, s->active ? s->active->user->uid : 0);
-
- if (r < 0)
- log_error("Failed to apply ACLs: %s", strerror(-r));
-
- return r;
-}
-
-int seat_set_active(Seat *s, Session *session) {
- Session *old_active;
-
- assert(s);
- assert(!session || session->seat == s);
-
- if (session == s->active)
- return 0;
-
- old_active = s->active;
- s->active = session;
-
- seat_apply_acls(s, old_active);
-
- if (session && session->started)
- session_send_changed(session, "Active\0");
-
- if (!session || session->started)
- seat_send_changed(s, "ActiveSession\0");
-
- seat_save(s);
-
- if (session) {
- session_save(session);
- user_save(session->user);
- }
-
- if (old_active) {
- session_save(old_active);
- user_save(old_active->user);
- }
-
- return 0;
-}
-
-int seat_active_vt_changed(Seat *s, int vtnr) {
- Session *i, *new_active = NULL;
- int r;
-
- assert(s);
- assert(vtnr >= 1);
-
- if (!seat_is_vtconsole(s))
- return -EINVAL;
-
- log_debug("VT changed to %i", vtnr);
-
- LIST_FOREACH(sessions_by_seat, i, s->sessions)
- if (i->vtnr == vtnr) {
- new_active = i;
- break;
- }
-
- r = seat_set_active(s, new_active);
- manager_spawn_autovt(s->manager, vtnr);
-
- return r;
-}
-
-int seat_read_active_vt(Seat *s) {
- char t[64];
- ssize_t k;
- int r, vtnr;
-
- assert(s);
-
- if (!seat_is_vtconsole(s))
- return 0;
-
- lseek(s->manager->console_active_fd, SEEK_SET, 0);
-
- k = read(s->manager->console_active_fd, t, sizeof(t)-1);
- if (k <= 0) {
- log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF");
- return k < 0 ? -errno : -EIO;
- }
-
- t[k] = 0;
- truncate_nl(t);
-
- if (!startswith(t, "tty")) {
- log_error("Hm, /sys/class/tty/tty0/active is badly formatted.");
- return -EIO;
- }
-
- r = safe_atoi(t+3, &vtnr);
- if (r < 0) {
- log_error("Failed to parse VT number %s", t+3);
- return r;
- }
-
- if (vtnr <= 0) {
- log_error("VT number invalid: %s", t+3);
- return -EIO;
- }
-
- return seat_active_vt_changed(s, vtnr);
-}
-
-int seat_start(Seat *s) {
- assert(s);
-
- if (s->started)
- return 0;
-
- log_info("New seat %s.", s->id);
-
- /* Initialize VT magic stuff */
- seat_preallocate_vts(s);
-
- /* Read current VT */
- seat_read_active_vt(s);
-
- s->started = true;
-
- /* Save seat data */
- seat_save(s);
-
- seat_send_signal(s, true);
-
- return 0;
-}
-
-int seat_stop(Seat *s) {
- int r = 0;
-
- assert(s);
-
- if (s->started)
- log_info("Removed seat %s.", s->id);
-
- seat_stop_sessions(s);
-
- unlink(s->state_file);
- seat_add_to_gc_queue(s);
-
- if (s->started)
- seat_send_signal(s, false);
-
- s->started = false;
-
- return r;
-}
-
-int seat_stop_sessions(Seat *s) {
- Session *session;
- int r = 0, k;
-
- assert(s);
-
- LIST_FOREACH(sessions_by_seat, session, s->sessions) {
- k = session_stop(session);
- if (k < 0)
- r = k;
- }
-
- return r;
-}
-
-int seat_attach_session(Seat *s, Session *session) {
- assert(s);
- assert(session);
- assert(!session->seat);
-
- if (!seat_is_vtconsole(s) && s->sessions)
- return -EEXIST;
-
- session->seat = s;
- LIST_PREPEND(Session, sessions_by_seat, s->sessions, session);
-
- seat_send_changed(s, "Sessions\0");
-
- if (!seat_is_vtconsole(s)) {
- assert(!s->active);
- seat_set_active(s, session);
- }
-
- return 0;
-}
-
-bool seat_is_vtconsole(Seat *s) {
- assert(s);
-
- return s->manager->vtconsole == s;
-}
-
-int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
- Session *session;
- bool idle_hint = true;
- dual_timestamp ts = { 0, 0 };
-
- assert(s);
-
- LIST_FOREACH(sessions_by_seat, session, s->sessions) {
- dual_timestamp k;
- int ih;
-
- ih = session_get_idle_hint(session, &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 seat_check_gc(Seat *s, bool drop_not_started) {
- assert(s);
-
- if (drop_not_started && !s->started)
- return 0;
-
- if (seat_is_vtconsole(s))
- return 1;
-
- return !!s->devices;
-}
-
-void seat_add_to_gc_queue(Seat *s) {
- assert(s);
-
- if (s->in_gc_queue)
- return;
-
- LIST_PREPEND(Seat, gc_queue, s->manager->seat_gc_queue, s);
- s->in_gc_queue = true;
-}
-
-static bool seat_name_valid_char(char c) {
- return
- (c >= 'a' && c <= 'z') ||
- (c >= 'A' && c <= 'Z') ||
- (c >= '0' && c <= '9') ||
- c == '-' ||
- c == '_';
-}
-
-bool seat_name_is_valid(const char *name) {
- const char *p;
-
- assert(name);
-
- if (!startswith(name, "seat"))
- return false;
-
- if (!name[4])
- return false;
-
- for (p = name; *p; p++)
- if (!seat_name_valid_char(*p))
- return false;
-
- if (strlen(name) > 255)
- return false;
-
- return true;
-}
~ianmdlvl / elogind.git / blobdiff