475 lines
16 KiB
C
475 lines
16 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2010 Kay Sievers
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Copyright 2016 Michal Soltys <soltys@ziu.info>
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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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <linux/kd.h>
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#include <linux/tiocl.h>
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#include <linux/vt.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sysexits.h>
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#include <termios.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "io-util.h"
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#include "locale-util.h"
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#include "log.h"
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#include "process-util.h"
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#include "signal-util.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "terminal-util.h"
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#include "util.h"
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#include "virt.h"
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static int verify_vc_device(int fd) {
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unsigned char data[1];
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int r;
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data[0] = TIOCL_GETFGCONSOLE;
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r = ioctl(fd, TIOCLINUX, data);
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return r < 0 ? -errno : r;
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}
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static int verify_vc_allocation(unsigned idx) {
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char vcname[sizeof("/dev/vcs") + DECIMAL_STR_MAX(unsigned) - 2];
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int r;
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xsprintf(vcname, "/dev/vcs%u", idx);
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r = access(vcname, F_OK);
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return r < 0 ? -errno : r;
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}
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static int verify_vc_allocation_byfd(int fd) {
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struct vt_stat vcs = {};
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int r;
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r = ioctl(fd, VT_GETSTATE, &vcs);
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return r < 0 ? -errno : verify_vc_allocation(vcs.v_active);
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}
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static int verify_vc_kbmode(int fd) {
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int r, curr_mode;
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r = ioctl(fd, KDGKBMODE, &curr_mode);
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/*
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* Make sure we only adjust consoles in K_XLATE or K_UNICODE mode.
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* Otherwise we would (likely) interfere with X11's processing of the
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* key events.
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*
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* http://lists.freedesktop.org/archives/systemd-devel/2013-February/008573.html
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*/
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if (r < 0)
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return -errno;
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return IN_SET(curr_mode, K_XLATE, K_UNICODE) ? 0 : -EBUSY;
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}
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static int toggle_utf8(const char *name, int fd, bool utf8) {
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int r;
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struct termios tc = {};
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assert(name);
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r = ioctl(fd, KDSKBMODE, utf8 ? K_UNICODE : K_XLATE);
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if (r < 0)
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return log_warning_errno(errno, "Failed to %s UTF-8 kbdmode on %s: %m", enable_disable(utf8), name);
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r = loop_write(fd, utf8 ? "\033%G" : "\033%@", 3, false);
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if (r < 0)
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return log_warning_errno(r, "Failed to %s UTF-8 term processing on %s: %m", enable_disable(utf8), name);
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r = tcgetattr(fd, &tc);
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if (r >= 0) {
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SET_FLAG(tc.c_iflag, IUTF8, utf8);
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r = tcsetattr(fd, TCSANOW, &tc);
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}
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if (r < 0)
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return log_warning_errno(errno, "Failed to %s iutf8 flag on %s: %m", enable_disable(utf8), name);
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log_debug("UTF-8 kbdmode %sd on %s", enable_disable(utf8), name);
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return 0;
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}
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static int toggle_utf8_sysfs(bool utf8) {
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int r;
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r = write_string_file("/sys/module/vt/parameters/default_utf8", one_zero(utf8), 0);
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if (r < 0)
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return log_warning_errno(r, "Failed to %s sysfs UTF-8 flag: %m", enable_disable(utf8));
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log_debug("Sysfs UTF-8 flag %sd", enable_disable(utf8));
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return 0;
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}
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static int keyboard_load_and_wait(const char *vc, const char *map, const char *map_toggle, bool utf8) {
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_cleanup_free_ char *cmd = NULL;
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const char *args[8];
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unsigned i = 0;
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pid_t pid;
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int r;
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/* An empty map means kernel map */
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if (isempty(map))
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return 0;
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args[i++] = KBD_LOADKEYS;
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args[i++] = "-q";
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args[i++] = "-C";
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args[i++] = vc;
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if (utf8)
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args[i++] = "-u";
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args[i++] = map;
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if (map_toggle)
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args[i++] = map_toggle;
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args[i++] = NULL;
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log_debug("Executing \"%s\"...",
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strnull((cmd = strv_join((char**) args, " "))));
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r = safe_fork("(loadkeys)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS, &pid);
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if (r < 0)
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return log_error_errno(r, "Failed to fork: %m");
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if (r == 0) {
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execv(args[0], (char **) args);
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_exit(EXIT_FAILURE);
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}
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return wait_for_terminate_and_warn(KBD_LOADKEYS, pid, true);
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}
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static int font_load_and_wait(const char *vc, const char *font, const char *map, const char *unimap) {
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_cleanup_free_ char *cmd = NULL;
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const char *args[9];
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unsigned i = 0;
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pid_t pid;
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int r;
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/* Any part can be set independently */
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if (isempty(font) && isempty(map) && isempty(unimap))
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return 0;
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args[i++] = KBD_SETFONT;
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args[i++] = "-C";
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args[i++] = vc;
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if (!isempty(map)) {
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args[i++] = "-m";
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args[i++] = map;
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}
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if (!isempty(unimap)) {
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args[i++] = "-u";
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args[i++] = unimap;
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}
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if (!isempty(font))
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args[i++] = font;
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args[i++] = NULL;
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log_debug("Executing \"%s\"...",
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strnull((cmd = strv_join((char**) args, " "))));
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r = safe_fork("(setfont)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS, &pid);
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if (r < 0)
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return log_error_errno(r, "Failed to fork: %m");
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if (r == 0) {
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execv(args[0], (char **) args);
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_exit(EXIT_FAILURE);
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}
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return wait_for_terminate_and_warn(KBD_SETFONT, pid, true);
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}
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/*
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* A newly allocated VT uses the font from the source VT. Here
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* we update all possibly already allocated VTs with the configured
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* font. It also allows to restart systemd-vconsole-setup.service,
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* to apply a new font to all VTs.
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*
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* We also setup per-console utf8 related stuff: kbdmode, term
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* processing, stty iutf8.
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*/
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static void setup_remaining_vcs(int src_fd, unsigned src_idx, bool utf8) {
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struct console_font_op cfo = {
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.op = KD_FONT_OP_GET,
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.width = UINT_MAX, .height = UINT_MAX,
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.charcount = UINT_MAX,
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};
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struct unimapinit adv = {};
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struct unimapdesc unimapd;
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_cleanup_free_ struct unipair* unipairs = NULL;
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_cleanup_free_ void *fontbuf = NULL;
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unsigned i;
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int r;
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unipairs = new(struct unipair, USHRT_MAX);
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if (!unipairs) {
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log_oom();
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return;
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}
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/* get metadata of the current font (width, height, count) */
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r = ioctl(src_fd, KDFONTOP, &cfo);
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if (r < 0)
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log_warning_errno(errno, "KD_FONT_OP_GET failed while trying to get the font metadata: %m");
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else {
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/* verify parameter sanity first */
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if (cfo.width > 32 || cfo.height > 32 || cfo.charcount > 512)
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log_warning("Invalid font metadata - width: %u (max 32), height: %u (max 32), count: %u (max 512)",
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cfo.width, cfo.height, cfo.charcount);
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else {
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/*
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* Console fonts supported by the kernel are limited in size to 32 x 32 and maximum 512
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* characters. Thus with 1 bit per pixel it requires up to 65536 bytes. The height always
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* requries 32 per glyph, regardless of the actual height - see the comment above #define
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* max_font_size 65536 in drivers/tty/vt/vt.c for more details.
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*/
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fontbuf = malloc((cfo.width + 7) / 8 * 32 * cfo.charcount);
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if (!fontbuf) {
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log_oom();
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return;
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}
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/* get fonts from the source console */
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cfo.data = fontbuf;
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r = ioctl(src_fd, KDFONTOP, &cfo);
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if (r < 0)
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log_warning_errno(errno, "KD_FONT_OP_GET failed while trying to read the font data: %m");
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else {
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unimapd.entries = unipairs;
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unimapd.entry_ct = USHRT_MAX;
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r = ioctl(src_fd, GIO_UNIMAP, &unimapd);
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if (r < 0)
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log_warning_errno(errno, "GIO_UNIMAP failed while trying to read unicode mappings: %m");
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else
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cfo.op = KD_FONT_OP_SET;
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}
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}
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}
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if (cfo.op != KD_FONT_OP_SET)
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log_warning("Fonts will not be copied to remaining consoles");
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for (i = 1; i <= 63; i++) {
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char ttyname[sizeof("/dev/tty63")];
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_cleanup_close_ int fd_d = -1;
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if (i == src_idx || verify_vc_allocation(i) < 0)
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continue;
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/* try to open terminal */
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xsprintf(ttyname, "/dev/tty%u", i);
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fd_d = open_terminal(ttyname, O_RDWR|O_CLOEXEC|O_NOCTTY);
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if (fd_d < 0) {
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log_warning_errno(fd_d, "Unable to open tty%u, fonts will not be copied: %m", i);
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continue;
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}
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if (verify_vc_kbmode(fd_d) < 0)
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continue;
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toggle_utf8(ttyname, fd_d, utf8);
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if (cfo.op != KD_FONT_OP_SET)
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continue;
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r = ioctl(fd_d, KDFONTOP, &cfo);
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if (r < 0) {
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log_warning_errno(errno, "KD_FONT_OP_SET failed, fonts will not be copied to tty%u: %m", i);
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continue;
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}
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/*
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* copy unicode translation table
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* unimapd is a ushort count and a pointer to an
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* array of struct unipair { ushort, ushort }
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*/
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r = ioctl(fd_d, PIO_UNIMAPCLR, &adv);
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if (r < 0) {
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log_warning_errno(errno, "PIO_UNIMAPCLR failed, unimaps might be incorrect for tty%u: %m", i);
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continue;
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}
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r = ioctl(fd_d, PIO_UNIMAP, &unimapd);
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if (r < 0) {
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log_warning_errno(errno, "PIO_UNIMAP failed, unimaps might be incorrect for tty%u: %m", i);
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continue;
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}
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log_debug("Font and unimap successfully copied to %s", ttyname);
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}
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}
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static int find_source_vc(char **ret_path, unsigned *ret_idx) {
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_cleanup_free_ char *path = NULL;
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unsigned i;
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int ret_fd, r, err = 0;
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path = new(char, sizeof("/dev/tty63"));
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if (!path)
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return log_oom();
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for (i = 1; i <= 63; i++) {
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_cleanup_close_ int fd = -1;
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r = verify_vc_allocation(i);
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if (r < 0) {
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if (!err)
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err = -r;
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continue;
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}
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sprintf(path, "/dev/tty%u", i);
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fd = open_terminal(path, O_RDWR|O_CLOEXEC|O_NOCTTY);
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if (fd < 0) {
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if (!err)
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err = -fd;
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continue;
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}
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r = verify_vc_kbmode(fd);
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if (r < 0) {
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if (!err)
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err = -r;
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continue;
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}
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/* all checks passed, return this one as a source console */
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*ret_idx = i;
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*ret_path = path;
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path = NULL;
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ret_fd = fd;
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fd = -1;
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return ret_fd;
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}
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return log_error_errno(err, "No usable source console found: %m");
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}
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static int verify_source_vc(char **ret_path, const char *src_vc) {
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char *path;
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_cleanup_close_ int fd = -1;
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int ret_fd, r;
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fd = open_terminal(src_vc, O_RDWR|O_CLOEXEC|O_NOCTTY);
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if (fd < 0)
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return log_error_errno(fd, "Failed to open %s: %m", src_vc);
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r = verify_vc_device(fd);
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if (r < 0)
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return log_error_errno(r, "Device %s is not a virtual console: %m", src_vc);
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r = verify_vc_allocation_byfd(fd);
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if (r < 0)
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return log_error_errno(r, "Virtual console %s is not allocated: %m", src_vc);
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r = verify_vc_kbmode(fd);
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if (r < 0)
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return log_error_errno(r, "Virtual console %s is not in K_XLATE or K_UNICODE: %m", src_vc);
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path = strdup(src_vc);
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if (!path)
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return log_oom();
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*ret_path = path;
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ret_fd = fd;
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fd = -1;
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return ret_fd;
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}
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int main(int argc, char **argv) {
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_cleanup_free_ char
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*vc = NULL,
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*vc_keymap = NULL, *vc_keymap_toggle = NULL,
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*vc_font = NULL, *vc_font_map = NULL, *vc_font_unimap = NULL;
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_cleanup_close_ int fd = -1;
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bool utf8, keyboard_ok;
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unsigned idx = 0;
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int r;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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if (argv[1])
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fd = verify_source_vc(&vc, argv[1]);
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else
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fd = find_source_vc(&vc, &idx);
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if (fd < 0)
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return EXIT_FAILURE;
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utf8 = is_locale_utf8();
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r = parse_env_file("/etc/vconsole.conf", NEWLINE,
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"KEYMAP", &vc_keymap,
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"KEYMAP_TOGGLE", &vc_keymap_toggle,
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"FONT", &vc_font,
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"FONT_MAP", &vc_font_map,
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"FONT_UNIMAP", &vc_font_unimap,
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NULL);
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if (r < 0 && r != -ENOENT)
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log_warning_errno(r, "Failed to read /etc/vconsole.conf: %m");
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/* Let the kernel command line override /etc/vconsole.conf */
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if (detect_container() <= 0) {
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r = parse_env_file("/proc/cmdline", WHITESPACE,
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"vconsole.keymap", &vc_keymap,
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"vconsole.keymap_toggle", &vc_keymap_toggle,
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"vconsole.font", &vc_font,
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"vconsole.font_map", &vc_font_map,
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"vconsole.font_unimap", &vc_font_unimap,
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/* compatibility with obsolete multiple-dot scheme */
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"vconsole.keymap.toggle", &vc_keymap_toggle,
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"vconsole.font.map", &vc_font_map,
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"vconsole.font.unimap", &vc_font_unimap,
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NULL);
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if (r < 0 && r != -ENOENT)
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log_warning_errno(r, "Failed to read /proc/cmdline: %m");
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}
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(void) toggle_utf8_sysfs(utf8);
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(void) toggle_utf8(vc, fd, utf8);
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r = font_load_and_wait(vc, vc_font, vc_font_map, vc_font_unimap);
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keyboard_ok = keyboard_load_and_wait(vc, vc_keymap, vc_keymap_toggle, utf8) == 0;
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if (idx > 0) {
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if (r == 0)
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setup_remaining_vcs(fd, idx, utf8);
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else if (r == EX_OSERR)
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/* setfont returns EX_OSERR when ioctl(KDFONTOP/PIO_FONTX/PIO_FONTX) fails.
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* This might mean various things, but in particular lack of a graphical
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* console. Let's be generous and not treat this as an error. */
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log_notice("Setting fonts failed with a \"system error\", ignoring.");
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else
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log_warning("Setting source virtual console failed, ignoring remaining ones");
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}
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return IN_SET(r, 0, EX_OSERR) && keyboard_ok ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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