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Systemd/src/vconsole/vconsole-setup.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Kay Sievers
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 <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <linux/kd.h>
#include <linux/tiocl.h>
#include <linux/vt.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "alloc-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "io-util.h"
#include "locale-util.h"
#include "log.h"
#include "process-util.h"
#include "signal-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "terminal-util.h"
#include "util.h"
#include "virt.h"
static bool is_vconsole(int fd) {
unsigned char data[1];
data[0] = TIOCL_GETFGCONSOLE;
return ioctl(fd, TIOCLINUX, data) >= 0;
}
static int disable_utf8(int fd) {
int r = 0, k;
if (ioctl(fd, KDSKBMODE, K_XLATE) < 0)
r = -errno;
k = loop_write(fd, "\033%@", 3, false);
if (k < 0)
r = k;
k = write_string_file("/sys/module/vt/parameters/default_utf8", "0", 0);
if (k < 0)
r = k;
if (r < 0)
log_warning_errno(r, "Failed to disable UTF-8: %m");
return r;
}
static int enable_utf8(int fd) {
int r = 0, k;
long current = 0;
if (ioctl(fd, KDGKBMODE, &current) < 0 || current == K_XLATE) {
/*
* Change the current keyboard to unicode, unless it
* is currently in raw or off mode anyway. We
* shouldn't interfere with X11's processing of the
* key events.
*
* http://lists.freedesktop.org/archives/systemd-devel/2013-February/008573.html
*
*/
if (ioctl(fd, KDSKBMODE, K_UNICODE) < 0)
r = -errno;
}
k = loop_write(fd, "\033%G", 3, false);
if (k < 0)
r = k;
k = write_string_file("/sys/module/vt/parameters/default_utf8", "1", 0);
if (k < 0)
r = k;
if (r < 0)
log_warning_errno(r, "Failed to enable UTF-8: %m");
return r;
}
static int keyboard_load_and_wait(const char *vc, const char *map, const char *map_toggle, bool utf8) {
const char *args[8];
int i = 0, r;
pid_t pid;
/* An empty map means kernel map */
if (isempty(map))
return 1;
args[i++] = KBD_LOADKEYS;
args[i++] = "-q";
args[i++] = "-C";
args[i++] = vc;
if (utf8)
args[i++] = "-u";
args[i++] = map;
if (map_toggle)
args[i++] = map_toggle;
args[i++] = NULL;
pid = fork();
if (pid < 0)
return log_error_errno(errno, "Failed to fork: %m");
else if (pid == 0) {
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
execv(args[0], (char **) args);
_exit(EXIT_FAILURE);
}
r = wait_for_terminate_and_warn(KBD_LOADKEYS, pid, true);
if (r < 0)
return r;
return r == 0;
}
static int font_load_and_wait(const char *vc, const char *font, const char *map, const char *unimap) {
const char *args[9];
int i = 0, r;
pid_t pid;
/* An empty font means kernel font */
if (isempty(font))
return 1;
args[i++] = KBD_SETFONT;
args[i++] = "-C";
args[i++] = vc;
args[i++] = font;
if (map) {
args[i++] = "-m";
args[i++] = map;
}
if (unimap) {
args[i++] = "-u";
args[i++] = unimap;
}
args[i++] = NULL;
pid = fork();
if (pid < 0)
return log_error_errno(errno, "Failed to fork: %m");
else if (pid == 0) {
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
execv(args[0], (char **) args);
_exit(EXIT_FAILURE);
}
r = wait_for_terminate_and_warn(KBD_SETFONT, pid, true);
if (r < 0)
return r;
return r == 0;
}
/*
* A newly allocated VT uses the font from the active VT. Here
* we update all possibly already allocated VTs with the configured
* font. It also allows to restart systemd-vconsole-setup.service,
* to apply a new font to all VTs.
*/
static void font_copy_to_all_vcs(int fd) {
struct vt_stat vcs = {};
unsigned char map8[E_TABSZ];
unsigned short map16[E_TABSZ];
struct unimapdesc unimapd;
struct unipair unipairs[USHRT_MAX];
int i, r;
/* get active, and 16 bit mask of used VT numbers */
r = ioctl(fd, VT_GETSTATE, &vcs);
if (r < 0) {
log_debug_errno(errno, "VT_GETSTATE failed, ignoring: %m");
return;
}
for (i = 1; i <= 15; i++) {
char vcname[strlen("/dev/vcs") + DECIMAL_STR_MAX(int)];
_cleanup_close_ int vcfd = -1;
struct console_font_op cfo = {};
if (i == vcs.v_active)
continue;
/* skip non-allocated ttys */
xsprintf(vcname, "/dev/vcs%i", i);
if (access(vcname, F_OK) < 0)
continue;
xsprintf(vcname, "/dev/tty%i", i);
vcfd = open_terminal(vcname, O_RDWR|O_CLOEXEC);
if (vcfd < 0)
continue;
/* copy font from active VT, where the font was uploaded to */
cfo.op = KD_FONT_OP_COPY;
cfo.height = vcs.v_active-1; /* tty1 == index 0 */
(void) ioctl(vcfd, KDFONTOP, &cfo);
/* copy map of 8bit chars */
if (ioctl(fd, GIO_SCRNMAP, map8) >= 0)
(void) ioctl(vcfd, PIO_SCRNMAP, map8);
/* copy map of 8bit chars -> 16bit Unicode values */
if (ioctl(fd, GIO_UNISCRNMAP, map16) >= 0)
(void) ioctl(vcfd, PIO_UNISCRNMAP, map16);
/* copy unicode translation table */
/* unimapd is a ushort count and a pointer to an
array of struct unipair { ushort, ushort } */
unimapd.entries = unipairs;
unimapd.entry_ct = USHRT_MAX;
if (ioctl(fd, GIO_UNIMAP, &unimapd) >= 0) {
struct unimapinit adv = { 0, 0, 0 };
(void) ioctl(vcfd, PIO_UNIMAPCLR, &adv);
(void) ioctl(vcfd, PIO_UNIMAP, &unimapd);
}
}
}
int main(int argc, char **argv) {
const char *vc;
_cleanup_free_ char
*vc_keymap = NULL, *vc_keymap_toggle = NULL,
*vc_font = NULL, *vc_font_map = NULL, *vc_font_unimap = NULL;
_cleanup_close_ int fd = -1;
bool utf8, font_copy = false, font_ok, keyboard_ok;
int r = EXIT_FAILURE;
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
if (argv[1])
vc = argv[1];
else {
vc = "/dev/tty0";
font_copy = true;
}
fd = open_terminal(vc, O_RDWR|O_CLOEXEC);
if (fd < 0) {
log_error_errno(fd, "Failed to open %s: %m", vc);
return EXIT_FAILURE;
}
if (!is_vconsole(fd)) {
log_error("Device %s is not a virtual console.", vc);
return EXIT_FAILURE;
}
utf8 = is_locale_utf8();
r = parse_env_file("/etc/vconsole.conf", NEWLINE,
"KEYMAP", &vc_keymap,
"KEYMAP_TOGGLE", &vc_keymap_toggle,
"FONT", &vc_font,
"FONT_MAP", &vc_font_map,
"FONT_UNIMAP", &vc_font_unimap,
NULL);
if (r < 0 && r != -ENOENT)
log_warning_errno(r, "Failed to read /etc/vconsole.conf: %m");
/* Let the kernel command line override /etc/vconsole.conf */
if (detect_container() <= 0) {
r = parse_env_file("/proc/cmdline", WHITESPACE,
"vconsole.keymap", &vc_keymap,
"vconsole.keymap.toggle", &vc_keymap_toggle,
"vconsole.font", &vc_font,
"vconsole.font.map", &vc_font_map,
"vconsole.font.unimap", &vc_font_unimap,
NULL);
if (r < 0 && r != -ENOENT)
log_warning_errno(r, "Failed to read /proc/cmdline: %m");
}
if (utf8)
(void) enable_utf8(fd);
else
(void) disable_utf8(fd);
font_ok = font_load_and_wait(vc, vc_font, vc_font_map, vc_font_unimap) > 0;
keyboard_ok = keyboard_load_and_wait(vc, vc_keymap, vc_keymap_toggle, utf8) > 0;
/* Only copy the font when we executed setfont successfully */
if (font_copy && font_ok)
(void) font_copy_to_all_vcs(fd);
return font_ok && keyboard_ok ? EXIT_SUCCESS : EXIT_FAILURE;
}
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