aboutsummaryrefslogtreecommitdiff
path: root/depends/libxcb/src/xcb_util.c
blob: 0296ce0dd55b34da4c9a8a05dbf953b55ad997e8 (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
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 * Except as contained in this notice, the names of the authors or their
 * institutions shall not be used in advertising or otherwise to promote the
 * sale, use or other dealings in this Software without prior written
 * authorization from the authors.
 */

/* Utility functions implementable using only public APIs. */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <assert.h>
#include <sys/types.h>
#include <limits.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>

#ifdef _WIN32
#include "xcb_windefs.h"
#else
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <fcntl.h>
#include <netdb.h>
#endif /* _WIN32 */

#include "xcb.h"
#include "xcbext.h"
#include "xcbint.h"

#if defined(HAVE_TSOL_LABEL_H) && defined(HAVE_IS_SYSTEM_LABELED)
# include <tsol/label.h>
# include <sys/stat.h>
#endif

#ifdef HAVE_LAUNCHD
#include <sys/stat.h>
#endif

int xcb_popcount(uint32_t mask)
{
    uint32_t y;
    y = (mask >> 1) & 033333333333;
    y = mask - y - ((y >> 1) & 033333333333);
    return ((y + (y >> 3)) & 030707070707) % 077;
}

int xcb_sumof(uint8_t *list, int len)
{
  int i, s = 0;
  for(i=0; i<len; i++) {
    s += *list;
    list++;
  }
  return s;
}

#ifdef HAVE_LAUNCHD
/* Return true and parse if name matches <path to socket>[.<screen>]
 * Upon success:
 *     host = <path to socket>
 *     protocol = "unix"
 *     display = 0
 *     screen = <screen>
 */
static int _xcb_parse_display_path_to_socket(const char *name, char **host, char **protocol,
                                             int *displayp, int *screenp)
{
    struct stat sbuf;
    char path[PATH_MAX];
    int _screen = 0;

    strlcpy(path, name, sizeof(path));
    if (0 != stat(path, &sbuf)) {
        char *dot = strrchr(path, '.');
        if (!dot)
            return 0;
        *dot = '\0';

        if (0 != stat(path, &sbuf))
            return 0;

        _screen = atoi(dot + 1);
    }

    if (host) {
        *host = strdup(path);
        if (!*host)
            return 0;
    }

    if (protocol) {
        *protocol = strdup("unix");
        if (!*protocol) {
            if (host)
                free(*host);
            return 0;
        }
    }

    if (displayp)
        *displayp = 0;

    if (screenp)
        *screenp = _screen;

    return 1;
}
#endif

static int _xcb_parse_display(const char *name, char **host, char **protocol,
                      int *displayp, int *screenp)
{
    int len, display, screen;
    char *slash, *colon, *dot, *end;

    if(!name || !*name)
        name = getenv("DISPLAY");
    if(!name)
        return 0;

#ifdef HAVE_LAUNCHD
    /* First check for <path to socket>[.<screen>] */
    if (_xcb_parse_display_path_to_socket(name, host, protocol, displayp, screenp))
        return 1;
#endif

    slash = strrchr(name, '/');

    if (slash) {
        len = slash - name;
        if (protocol) {
            *protocol = malloc(len + 1);
            if(!*protocol)
                return 0;
            memcpy(*protocol, name, len);
            (*protocol)[len] = '\0';
        }
        name = slash + 1;
    } else
        if (protocol)
            *protocol = NULL;

    colon = strrchr(name, ':');
    if(!colon)
        goto error_out;
    len = colon - name;
    ++colon;
    display = strtoul(colon, &dot, 10);
    if(dot == colon)
        goto error_out;
    if(*dot == '\0')
        screen = 0;
    else
    {
        if(*dot != '.')
            goto error_out;
        ++dot;
        screen = strtoul(dot, &end, 10);
        if(end == dot || *end != '\0')
            goto error_out;
    }
    /* At this point, the display string is fully parsed and valid, but
     * the caller's memory is untouched. */

    *host = malloc(len + 1);
    if(!*host)
        goto error_out;
    memcpy(*host, name, len);
    (*host)[len] = '\0';
    *displayp = display;
    if(screenp)
        *screenp = screen;
    return 1;

error_out:
    if (protocol) {
        free(*protocol);
        *protocol = NULL;
    }

    return 0;
}

int xcb_parse_display(const char *name, char **host, int *displayp,
                             int *screenp)
{
    return _xcb_parse_display(name, host, NULL, displayp, screenp);
}

static int _xcb_open_tcp(const char *host, char *protocol, const unsigned short port);
#ifndef _WIN32
static int _xcb_open_unix(char *protocol, const char *file);
#endif /* !WIN32 */
#ifdef HAVE_ABSTRACT_SOCKETS
static int _xcb_open_abstract(char *protocol, const char *file, size_t filelen);
#endif

static int _xcb_open(const char *host, char *protocol, const int display)
{
    int fd;
#ifdef __hpux
    static const char unix_base[] = "/usr/spool/sockets/X11/";
#else
    static const char unix_base[] = "/tmp/.X11-unix/X";
#endif
    const char *base = unix_base;
    size_t filelen;
    char *file = NULL;
    int actual_filelen;

    /* If protocol or host is "unix", fall through to Unix socket code below */
    if ((!protocol || (strcmp("unix",protocol) != 0)) &&
        (*host != '\0') && (strcmp("unix",host) != 0))
    {
        /* display specifies TCP */
        unsigned short port = X_TCP_PORT + display;
        return _xcb_open_tcp(host, protocol, port);
    }

#ifndef _WIN32
#if defined(HAVE_TSOL_LABEL_H) && defined(HAVE_IS_SYSTEM_LABELED)
    /* Check special path for Unix sockets under Solaris Trusted Extensions */
    if (is_system_labeled())
    {
        struct stat sbuf;
        const char *tsol_base = "/var/tsol/doors/.X11-unix/X";
        char tsol_socket[PATH_MAX];

        snprintf(tsol_socket, sizeof(tsol_socket), "%s%d", tsol_base, display);

        if (stat(tsol_socket, &sbuf) == 0)
            base = tsol_base;
    }
#endif

#ifdef HAVE_LAUNCHD
    struct stat sbuf;
    if (0 == stat(host, &sbuf)) {
        file = strdup(host);
        if(file == NULL)
            return -1;
        filelen = actual_filelen = strlen(file);
    } else
#endif
    {
        filelen = strlen(base) + 1 + sizeof(display) * 3 + 1;
        file = malloc(filelen);
        if(file == NULL)
            return -1;

        /* display specifies Unix socket */
        actual_filelen = snprintf(file, filelen, "%s%d", base, display);
    }

    if(actual_filelen < 0)
    {
        free(file);
        return -1;
    }
    /* snprintf may truncate the file */
    filelen = MIN(actual_filelen, filelen - 1);
#ifdef HAVE_ABSTRACT_SOCKETS
    fd = _xcb_open_abstract(protocol, file, filelen);
    if (fd >= 0 || (errno != ENOENT && errno != ECONNREFUSED))
    {
        free(file);
        return fd;
    }

#endif
    fd = _xcb_open_unix(protocol, file);
    free(file);

    if (fd < 0 && !protocol && *host == '\0') {
            unsigned short port = X_TCP_PORT + display;
            fd = _xcb_open_tcp(host, protocol, port);
    }

    return fd;
#endif /* !_WIN32 */
    return -1; /* if control reaches here then something has gone wrong */
}

static int _xcb_socket(int family, int type, int proto)
{
    int fd;

#ifdef SOCK_CLOEXEC
    fd = socket(family, type | SOCK_CLOEXEC, proto);
    if (fd == -1 && errno == EINVAL)
#endif
    {
        fd = socket(family, type, proto);
#ifndef _WIN32
        if (fd >= 0)
            fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
    }
    return fd;
}


static int _xcb_do_connect(int fd, const struct sockaddr* addr, int addrlen) {
    int on = 1;

    if(fd < 0)
        return -1;

    setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on));
    setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on));

    return connect(fd, addr, addrlen);
}

static int _xcb_open_tcp(const char *host, char *protocol, const unsigned short port)
{
    int fd = -1;
#if HAVE_GETADDRINFO
    struct addrinfo hints;
    char service[6]; /* "65535" with the trailing '\0' */
    struct addrinfo *results, *addr;
    char *bracket;
#endif

    if (protocol && strcmp("tcp",protocol) && strcmp("inet",protocol)
#ifdef AF_INET6
                 && strcmp("inet6",protocol)
#endif
        )
        return -1;

    if (*host == '\0')
        host = "localhost";

#if HAVE_GETADDRINFO
    memset(&hints, 0, sizeof(hints));
#ifdef AI_NUMERICSERV
    hints.ai_flags |= AI_NUMERICSERV;
#endif
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;

#ifdef AF_INET6
    /* Allow IPv6 addresses enclosed in brackets. */
    if(host[0] == '[' && (bracket = strrchr(host, ']')) && bracket[1] == '\0')
    {
        *bracket = '\0';
        ++host;
        hints.ai_flags |= AI_NUMERICHOST;
        hints.ai_family = AF_INET6;
    }
#endif

    snprintf(service, sizeof(service), "%hu", port);
    if(getaddrinfo(host, service, &hints, &results))
        /* FIXME: use gai_strerror, and fill in error connection */
        return -1;

    for(addr = results; addr; addr = addr->ai_next)
    {
        fd = _xcb_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
        if (_xcb_do_connect(fd, addr->ai_addr, addr->ai_addrlen) >= 0)
            break;
        close(fd);
        fd = -1;
    }
    freeaddrinfo(results);
    return fd;
#else
    {
        struct hostent* _h;
        struct sockaddr_in _s;
        struct in_addr ** _c;

        if((_h = gethostbyname(host)) == NULL)
            return -1;

        _c = (struct in_addr**)_h->h_addr_list;
        fd = -1;

        while(*_c) {
            _s.sin_family = AF_INET;
            _s.sin_port = htons(port);
            _s.sin_addr = *(*_c);

            fd = _xcb_socket(_s.sin_family, SOCK_STREAM, 0);
            if(_xcb_do_connect(fd, (struct sockaddr*)&_s, sizeof(_s)) >= 0)
                break;

#ifdef _WIN32
            closesocket(fd);
#else
            close(fd);
#endif
            fd = -1;
            ++_c;
        }

        return fd;
    }
#endif
}

#ifndef _WIN32
static int _xcb_open_unix(char *protocol, const char *file)
{
    int fd;
    struct sockaddr_un addr;
    socklen_t len = sizeof(int);
    int val;

    if (protocol && strcmp("unix",protocol))
        return -1;

    strcpy(addr.sun_path, file);
    addr.sun_family = AF_UNIX;
#ifdef HAVE_SOCKADDR_SUN_LEN
    addr.sun_len = SUN_LEN(&addr);
#endif
    fd = _xcb_socket(AF_UNIX, SOCK_STREAM, 0);
    if(fd == -1)
        return -1;
    if(getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0 && val < 64 * 1024)
    {
        val = 64 * 1024;
        setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof(int));
    }
    if(connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
        close(fd);
        return -1;
    }
    return fd;
}
#endif /* !_WIN32 */

#ifdef HAVE_ABSTRACT_SOCKETS
static int _xcb_open_abstract(char *protocol, const char *file, size_t filelen)
{
    int fd;
    struct sockaddr_un addr = {0};
    socklen_t namelen;

    if (protocol && strcmp("unix",protocol))
        return -1;

    strcpy(addr.sun_path + 1, file);
    addr.sun_family = AF_UNIX;
    namelen = offsetof(struct sockaddr_un, sun_path) + 1 + filelen;
#ifdef HAVE_SOCKADDR_SUN_LEN
    addr.sun_len = 1 + filelen;
#endif
    fd = _xcb_socket(AF_UNIX, SOCK_STREAM, 0);
    if (fd == -1)
        return -1;
    if (connect(fd, (struct sockaddr *) &addr, namelen) == -1) {
        close(fd);
        return -1;
    }
    return fd;
}
#endif

xcb_connection_t *xcb_connect(const char *displayname, int *screenp)
{
    return xcb_connect_to_display_with_auth_info(displayname, NULL, screenp);
}

xcb_connection_t *xcb_connect_to_display_with_auth_info(const char *displayname, xcb_auth_info_t *auth, int *screenp)
{
    int fd, display = 0;
    char *host = NULL;
    char *protocol = NULL;
    xcb_auth_info_t ourauth;
    xcb_connection_t *c;

    int parsed = _xcb_parse_display(displayname, &host, &protocol, &display, screenp);

    if(!parsed) {
        c = _xcb_conn_ret_error(XCB_CONN_CLOSED_PARSE_ERR);
        goto out;
    }

#ifdef _WIN32
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        c = _xcb_conn_ret_error(XCB_CONN_ERROR);
        goto out;
    }
#endif

    fd = _xcb_open(host, protocol, display);

    if(fd == -1) {
        c = _xcb_conn_ret_error(XCB_CONN_ERROR);
#ifdef _WIN32
        WSACleanup();
#endif
        goto out;
    }

    if(auth) {
        c = xcb_connect_to_fd(fd, auth);
        goto out;
    }

    if(_xcb_get_auth_info(fd, &ourauth, display))
    {
        c = xcb_connect_to_fd(fd, &ourauth);
        free(ourauth.name);
        free(ourauth.data);
    }
    else
        c = xcb_connect_to_fd(fd, 0);

    if(c->has_error)
        goto out;

    /* Make sure requested screen number is in bounds for this server */
    if((screenp != NULL) && (*screenp >= (int) c->setup->roots_len)) {
        xcb_disconnect(c);
        c = _xcb_conn_ret_error(XCB_CONN_CLOSED_INVALID_SCREEN);
        goto out;
    }

out:
    free(host);
    free(protocol);
    return c;
}