src/vconsole/vconsole-setup.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Kay Sievers
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <limits.h>
  23 #include <linux/kd.h>
  24 #include <linux/tiocl.h>
  25 #include <linux/vt.h>
  26 #include <stdbool.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <sys/ioctl.h>
  30 #include <termios.h>
  31 #include <unistd.h>
  32
  33 #include "alloc-util.h"
  34 #include "fd-util.h"
  35 #include "fileio.h"
  36 #include "io-util.h"
  37 #include "locale-util.h"
  38 #include "log.h"
  39 #include "process-util.h"
  40 #include "signal-util.h"
  41 #include "stdio-util.h"
  42 #include "string-util.h"
  43 #include "terminal-util.h"
  44 #include "util.h"
  45 #include "virt.h"
  46
  47 static bool is_vconsole(int fd) {
  48         unsigned char data[1];
  49
  50         data[0] = TIOCL_GETFGCONSOLE;
  51         return ioctl(fd, TIOCLINUX, data) >= 0;
  52 }
  53
  54 static int toggle_utf8(int fd, bool utf8) {
  55         int r;
  56         struct termios tc = {};
  57
  58         r = ioctl(fd, KDSKBMODE, utf8 ? K_UNICODE : K_XLATE);
  59         if (r < 0)
  60                 return log_warning_errno(errno, "Failed to %s UTF-8 kbdmode: %m", utf8 ? "enable" : "disable");
  61
  62         r = loop_write(fd, utf8 ? "\033%G" : "\033%@", 3, false);
  63         if (r < 0)
  64                 return log_warning_errno(r, "Failed to %s UTF-8 term processing: %m", utf8 ? "enable" : "disable");
  65
  66         r = tcgetattr(fd, &tc);
  67         if (r >= 0) {
  68                 if (utf8)
  69                         tc.c_iflag |= IUTF8;
  70                 else
  71                         tc.c_iflag &= ~IUTF8;
  72                 r = tcsetattr(fd, TCSANOW, &tc);
  73         }
  74         if (r < 0)
  75                 return log_warning_errno(errno, "Failed to %s iutf8 flag: %m", utf8 ? "enable" : "disable");
  76
  77         return 0;
  78 }
  79
  80 static int toggle_utf8_sysfs(bool utf8) {
  81         int r;
  82
  83         r = write_string_file("/sys/module/vt/parameters/default_utf8", one_zero(utf8), 0);
  84         if (r < 0)
  85                 log_warning_errno(r, "Failed to %s sysfs UTF-8 flag: %m", utf8 ? "enable" : "disable");
  86         return r;
  87 }
  88
  89 static int keyboard_load_and_wait(const char *vc, const char *map, const char *map_toggle, bool utf8) {
  90         const char *args[8];
  91         int i = 0, r;
  92         pid_t pid;
  93
  94         /* An empty map means kernel map */
  95         if (isempty(map))
  96                 return 1;
  97
  98         args[i++] = KBD_LOADKEYS;
  99         args[i++] = "-q";
 100         args[i++] = "-C";
 101         args[i++] = vc;
 102         if (utf8)
 103                 args[i++] = "-u";
 104         args[i++] = map;
 105         if (map_toggle)
 106                 args[i++] = map_toggle;
 107         args[i++] = NULL;
 108
 109         pid = fork();
 110         if (pid < 0)
 111                 return log_error_errno(errno, "Failed to fork: %m");
 112         else if (pid == 0) {
 113
 114                 (void) reset_all_signal_handlers();
 115                 (void) reset_signal_mask();
 116
 117                 execv(args[0], (char **) args);
 118                 _exit(EXIT_FAILURE);
 119         }
 120
 121         r = wait_for_terminate_and_warn(KBD_LOADKEYS, pid, true);
 122         if (r < 0)
 123                 return r;
 124
 125         return r == 0;
 126 }
 127
 128 static int font_load_and_wait(const char *vc, const char *font, const char *map, const char *unimap) {
 129         const char *args[9];
 130         int i = 0, r;
 131         pid_t pid;
 132
 133         /* An empty font means kernel font */
 134         if (isempty(font))
 135                 return 1;
 136
 137         args[i++] = KBD_SETFONT;
 138         args[i++] = "-C";
 139         args[i++] = vc;
 140         args[i++] = font;
 141         if (map) {
 142                 args[i++] = "-m";
 143                 args[i++] = map;
 144         }
 145         if (unimap) {
 146                 args[i++] = "-u";
 147                 args[i++] = unimap;
 148         }
 149         args[i++] = NULL;
 150
 151         pid = fork();
 152         if (pid < 0)
 153                 return log_error_errno(errno, "Failed to fork: %m");
 154         else if (pid == 0) {
 155
 156                 (void) reset_all_signal_handlers();
 157                 (void) reset_signal_mask();
 158
 159                 execv(args[0], (char **) args);
 160                 _exit(EXIT_FAILURE);
 161         }
 162
 163         r = wait_for_terminate_and_warn(KBD_SETFONT, pid, true);
 164         if (r < 0)
 165                 return r;
 166
 167         return r == 0;
 168 }
 169
 170 /*
 171  * A newly allocated VT uses the font from the active VT. Here
 172  * we update all possibly already allocated VTs with the configured
 173  * font. It also allows to restart systemd-vconsole-setup.service,
 174  * to apply a new font to all VTs.
 175  */
 176 static void font_copy_to_all_vcs(int fd) {
 177         struct vt_stat vcs = {};
 178         struct unimapdesc unimapd;
 179         _cleanup_free_ struct unipair* unipairs = NULL;
 180         int i, r;
 181
 182         unipairs = new(struct unipair, USHRT_MAX);
 183         if (!unipairs) {
 184                 log_oom();
 185                 return;
 186         }
 187
 188         /* get active, and 16 bit mask of used VT numbers */
 189         r = ioctl(fd, VT_GETSTATE, &vcs);
 190         if (r < 0) {
 191                 log_debug_errno(errno, "VT_GETSTATE failed, ignoring: %m");
 192                 return;
 193         }
 194
 195         for (i = 1; i <= 63; i++) {
 196                 char vcname[strlen("/dev/vcs") + DECIMAL_STR_MAX(int)];
 197                 _cleanup_close_ int vcfd = -1;
 198                 struct console_font_op cfo = {};
 199
 200                 if (i == vcs.v_active)
 201                         continue;
 202
 203                 /* skip non-allocated ttys */
 204                 xsprintf(vcname, "/dev/vcs%i", i);
 205                 if (access(vcname, F_OK) < 0)
 206                         continue;
 207
 208                 xsprintf(vcname, "/dev/tty%i", i);
 209                 vcfd = open_terminal(vcname, O_RDWR|O_CLOEXEC);
 210                 if (vcfd < 0)
 211                         continue;
 212
 213                 /* copy font from active VT, where the font was uploaded to */
 214                 cfo.op = KD_FONT_OP_COPY;
 215                 cfo.height = vcs.v_active-1; /* tty1 == index 0 */
 216                 (void) ioctl(vcfd, KDFONTOP, &cfo);
 217
 218                 /* copy unicode translation table */
 219                 /* unimapd is a ushort count and a pointer to an
 220                    array of struct unipair { ushort, ushort } */
 221                 unimapd.entries  = unipairs;
 222                 unimapd.entry_ct = USHRT_MAX;
 223                 if (ioctl(fd, GIO_UNIMAP, &unimapd) >= 0) {
 224                         struct unimapinit adv = { 0, 0, 0 };
 225
 226                         (void) ioctl(vcfd, PIO_UNIMAPCLR, &adv);
 227                         (void) ioctl(vcfd, PIO_UNIMAP, &unimapd);
 228                 }
 229         }
 230 }
 231
 232 int main(int argc, char **argv) {
 233         const char *vc;
 234         _cleanup_free_ char
 235                 *vc_keymap = NULL, *vc_keymap_toggle = NULL,
 236                 *vc_font = NULL, *vc_font_map = NULL, *vc_font_unimap = NULL;
 237         _cleanup_close_ int fd = -1;
 238         bool utf8, font_copy = false, font_ok, keyboard_ok;
 239         int r = EXIT_FAILURE;
 240
 241         log_set_target(LOG_TARGET_AUTO);
 242         log_parse_environment();
 243         log_open();
 244
 245         umask(0022);
 246
 247         if (argv[1])
 248                 vc = argv[1];
 249         else {
 250                 vc = "/dev/tty0";
 251                 font_copy = true;
 252         }
 253
 254         fd = open_terminal(vc, O_RDWR|O_CLOEXEC);
 255         if (fd < 0) {
 256                 log_error_errno(fd, "Failed to open %s: %m", vc);
 257                 return EXIT_FAILURE;
 258         }
 259
 260         if (!is_vconsole(fd)) {
 261                 log_error("Device %s is not a virtual console.", vc);
 262                 return EXIT_FAILURE;
 263         }
 264
 265         utf8 = is_locale_utf8();
 266
 267         r = parse_env_file("/etc/vconsole.conf", NEWLINE,
 268                            "KEYMAP", &vc_keymap,
 269                            "KEYMAP_TOGGLE", &vc_keymap_toggle,
 270                            "FONT", &vc_font,
 271                            "FONT_MAP", &vc_font_map,
 272                            "FONT_UNIMAP", &vc_font_unimap,
 273                            NULL);
 274
 275         if (r < 0 && r != -ENOENT)
 276                 log_warning_errno(r, "Failed to read /etc/vconsole.conf: %m");
 277
 278         /* Let the kernel command line override /etc/vconsole.conf */
 279         if (detect_container() <= 0) {
 280                 r = parse_env_file("/proc/cmdline", WHITESPACE,
 281                                    "vconsole.keymap", &vc_keymap,
 282                                    "vconsole.keymap.toggle", &vc_keymap_toggle,
 283                                    "vconsole.font", &vc_font,
 284                                    "vconsole.font.map", &vc_font_map,
 285                                    "vconsole.font.unimap", &vc_font_unimap,
 286                                    NULL);
 287
 288                 if (r < 0 && r != -ENOENT)
 289                         log_warning_errno(r, "Failed to read /proc/cmdline: %m");
 290         }
 291
 292         toggle_utf8_sysfs(utf8);
 293         toggle_utf8(fd, utf8);
 294
 295         font_ok = font_load_and_wait(vc, vc_font, vc_font_map, vc_font_unimap) > 0;
 296         keyboard_ok = keyboard_load_and_wait(vc, vc_keymap, vc_keymap_toggle, utf8) > 0;
 297
 298         /* Only copy the font when we executed setfont successfully */
 299         if (font_copy && font_ok)
 300                 (void) font_copy_to_all_vcs(fd);
 301
 302         return font_ok && keyboard_ok ? EXIT_SUCCESS : EXIT_FAILURE;
 303 }