summaryrefslogtreecommitdiff
path: root/src/vconsole/vconsole-setup.c
blob: a0ab5990fca7ad838872d47e5de14ab55c43b058 (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
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
/***
  This file is part of systemd.

  Copyright 2010 Kay Sievers
  Copyright 2016 Michal Soltys <soltys@ziu.info>

  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 <termios.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 bool is_allocated(unsigned int idx) {
        char vcname[strlen("/dev/vcs") + DECIMAL_STR_MAX(int)];

        xsprintf(vcname, "/dev/vcs%i", idx);
        return access(vcname, F_OK) == 0;
}

static bool is_allocated_byfd(int fd) {
        struct vt_stat vcs = {};

        if (ioctl(fd, VT_GETSTATE, &vcs) < 0) {
                log_warning_errno(errno, "VT_GETSTATE failed: %m");
                return false;
        }
        return is_allocated(vcs.v_active);
}

static bool is_settable(int fd) {
        int r, curr_mode;

        r = ioctl(fd, KDGKBMODE, &curr_mode);
        /*
         * Make sure we only adjust consoles in K_XLATE or K_UNICODE mode.
         * Otherwise we would (likely) interfere with X11's processing of the
         * key events.
         *
         * http://lists.freedesktop.org/archives/systemd-devel/2013-February/008573.html
         */
        return r == 0 && IN_SET(curr_mode, K_XLATE, K_UNICODE);
}

static int toggle_utf8(const char *name, int fd, bool utf8) {
        int r;
        struct termios tc = {};

        assert(name);

        r = ioctl(fd, KDSKBMODE, utf8 ? K_UNICODE : K_XLATE);
        if (r < 0)
                return log_warning_errno(errno, "Failed to %s UTF-8 kbdmode on %s: %m", enable_disable(utf8), name);

        r = loop_write(fd, utf8 ? "\033%G" : "\033%@", 3, false);
        if (r < 0)
                return log_warning_errno(r, "Failed to %s UTF-8 term processing on %s: %m", enable_disable(utf8), name);

        r = tcgetattr(fd, &tc);
        if (r >= 0) {
                if (utf8)
                        tc.c_iflag |= IUTF8;
                else
                        tc.c_iflag &= ~IUTF8;
                r = tcsetattr(fd, TCSANOW, &tc);
        }
        if (r < 0)
                return log_warning_errno(errno, "Failed to %s iutf8 flag on %s: %m", enable_disable(utf8), name);

        log_debug("UTF-8 kbdmode %sd on %s", enable_disable(utf8), name);
        return 0;
}

static int toggle_utf8_sysfs(bool utf8) {
        int r;

        r = write_string_file("/sys/module/vt/parameters/default_utf8", one_zero(utf8), 0);
        if (r < 0)
                return log_warning_errno(r, "Failed to %s sysfs UTF-8 flag: %m", enable_disable(utf8));

        log_debug("Sysfs UTF-8 flag %sd", enable_disable(utf8));
        return 0;
}

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;
        pid_t pid;

        /* An empty map means kernel map */
        if (isempty(map))
                return 0;

        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);
        }

        return wait_for_terminate_and_warn(KBD_LOADKEYS, pid, true);
}

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;
        pid_t pid;

        /* Any part can be set independently */
        if (isempty(font) && isempty(map) && isempty(unimap))
                return 0;

        args[i++] = KBD_SETFONT;
        args[i++] = "-C";
        args[i++] = vc;
        if (!isempty(map)) {
                args[i++] = "-m";
                args[i++] = map;
        }
        if (!isempty(unimap)) {
                args[i++] = "-u";
                args[i++] = unimap;
        }
        if (!isempty(font))
                args[i++] = font;
        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);
        }

        return wait_for_terminate_and_warn(KBD_SETFONT, pid, true);
}

/*
 * 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.
 *
 * We also setup per-console utf8 related stuff: kbdmode, term
 * processing, stty iutf8.
 */
static void setup_remaining_vcs(int fd, bool utf8) {
        struct console_font_op cfo = {
                .op = KD_FONT_OP_GET,
                .width = UINT_MAX, .height = UINT_MAX,
                .charcount = UINT_MAX,
        };
        struct vt_stat vcs = {};
        struct unimapinit adv = {};
        struct unimapdesc unimapd;
        _cleanup_free_ struct unipair* unipairs = NULL;
        _cleanup_free_ void *fontbuf = 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_warning_errno(errno, "VT_GETSTATE failed, ignoring remaining consoles: %m");
                return;
        }

        /* get metadata of the current font (width, height, count) */
        r = ioctl(fd, KDFONTOP, &cfo);
        if (r < 0)
                log_warning_errno(errno, "KD_FONT_OP_GET failed while trying to get the font metadata: %m");
        else {
                /* verify parameter sanity first */
                if (cfo.width > 32 || cfo.height > 32 || cfo.charcount > 512)
                        log_warning("Invalid font metadata - width: %u (max 32), height: %u (max 32), count: %u (max 512)",
                                    cfo.width, cfo.height, cfo.charcount);
                else {
                        /*
                         * Console fonts supported by the kernel are limited in size to 32 x 32 and maximum 512
                         * characters. Thus with 1 bit per pixel it requires up to 65536 bytes. The height always
                         * requries 32 per glyph, regardless of the actual height - see the comment above #define
                         * max_font_size 65536 in drivers/tty/vt/vt.c for more details.
                         */
                        fontbuf = malloc((cfo.width + 7) / 8 * 32 * cfo.charcount);
                        if (!fontbuf) {
                                log_oom();
                                return;
                        }
                        /* get fonts from source console */
                        cfo.data = fontbuf;
                        r = ioctl(fd, KDFONTOP, &cfo);
                        if (r < 0)
                                log_warning_errno(errno, "KD_FONT_OP_GET failed while trying to read the font data: %m");
                        else {
                                unimapd.entries  = unipairs;
                                unimapd.entry_ct = USHRT_MAX;
                                r = ioctl(fd, GIO_UNIMAP, &unimapd);
                                if (r < 0)
                                        log_warning_errno(errno, "GIO_UNIMAP failed while trying to read unicode mappings: %m");
                                else
                                        cfo.op = KD_FONT_OP_SET;
                        }
                }
        }

        if (cfo.op != KD_FONT_OP_SET)
                log_warning("Fonts will not be copied to remaining consoles");

        for (i = 1; i <= 63; i++) {
                char ttyname[strlen("/dev/tty") + DECIMAL_STR_MAX(int)];
                _cleanup_close_ int fd_d = -1;

                if (i == vcs.v_active || !is_allocated(i))
                        continue;

                /* try to open terminal */
                xsprintf(ttyname, "/dev/tty%i", i);
                fd_d = open_terminal(ttyname, O_RDWR|O_CLOEXEC);
                if (fd_d < 0) {
                        log_warning_errno(fd_d, "Unable to open tty%i, fonts will not be copied: %m", i);
                        continue;
                }

                if (!is_settable(fd_d))
                        continue;

                toggle_utf8(ttyname, fd_d, utf8);

                if (cfo.op != KD_FONT_OP_SET)
                        continue;

                r = ioctl(fd_d, KDFONTOP, &cfo);
                if (r < 0) {
                        log_warning_errno(errno, "KD_FONT_OP_SET failed, fonts will not be copied to tty%i: %m", i);
                        continue;
                }

                /* copy unicode translation table */
                /* unimapd is a ushort count and a pointer to an
                   array of struct unipair { ushort, ushort } */
                r = ioctl(fd_d, PIO_UNIMAPCLR, &adv);
                if (r < 0) {
                        log_warning_errno(errno, "PIO_UNIMAPCLR failed, unimaps might be incorrect for tty%i: %m", i);
                        continue;
                }

                r = ioctl(fd_d, PIO_UNIMAP, &unimapd);
                if (r < 0) {
                        log_warning_errno(errno, "PIO_UNIMAP failed, unimaps might be incorrect for tty%i: %m", i);
                        continue;
                }

                log_debug("Font and unimap successfully copied to %s", ttyname);
        }
}

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;
        }

        if (!is_allocated_byfd(fd)) {
                log_error("Virtual console %s is not allocated.", vc);
                return EXIT_FAILURE;
        }

        if (!is_settable(fd)) {
                log_error("Virtual console %s is not in K_XLATE or K_UNICODE.", 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,
                                   /* compatibility with obsolete multiple-dot scheme */
                                   "vconsole.keymap.toggle", &vc_keymap_toggle,
                                   "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");
        }

        toggle_utf8_sysfs(utf8);
        toggle_utf8(vc, fd, utf8);
        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;

        if (font_copy) {
                if (font_ok)
                        setup_remaining_vcs(fd, utf8);
                else
                        log_warning("Setting source virtual console failed, ignoring remaining ones");
        }

        return font_ok && keyboard_ok ? EXIT_SUCCESS : EXIT_FAILURE;
}