summaryrefslogtreecommitdiff
path: root/src/systemd-vconsole/vconsole-setup.c
blob: 1118118450e29ac1951789cac723f05b2ee56547 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
/***
  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;
        _cleanup_free_ struct unipair* unipairs = NULL;
        int i, r;

        unipairs = new(struct unipair, USHRT_MAX);
        if (!unipairs) {
                log_oom();
                return;
        }

        /* 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;
}