1 /* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a
4 * copy of this software and associated documentation files (the "Software"),
5 * to deal in the Software without restriction, including without limitation
6 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
7 * and/or sell copies of the Software, and to permit persons to whom the
8 * Software is furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
17 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
18 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
19 *
20 * Except as contained in this notice, the names of the authors or their
21 * institutions shall not be used in advertising or otherwise to promote the
22 * sale, use or other dealings in this Software without prior written
23 * authorization from the authors.
24 */
25
26 /* Utility functions implementable using only public APIs. */
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include <assert.h>
33 #include <sys/types.h>
34 #include <limits.h>
35 #include <errno.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <stddef.h>
39 #include <unistd.h>
40 #include <string.h>
41
42 #ifdef _WIN32
43 #include "xcb_windefs.h"
44 #else
45 #include <arpa/inet.h>
46 #include <sys/socket.h>
47 #include <sys/un.h>
48 #include <netinet/in.h>
49 #include <netinet/tcp.h>
50 #include <fcntl.h>
51 #include <netdb.h>
52 #endif /* _WIN32 */
53
54 #include "xcb.h"
55 #include "xcbext.h"
56 #include "xcbint.h"
57
58 #if defined(HAVE_TSOL_LABEL_H) && defined(HAVE_IS_SYSTEM_LABELED)
59 # include <tsol/label.h>
60 # include <sys/stat.h>
61 #endif
62
63 #ifdef HAVE_LAUNCHD
64 #include <sys/stat.h>
65 #endif
66
xcb_popcount(uint32_t mask)67 int xcb_popcount(uint32_t mask)
68 {
69 uint32_t y;
70 y = (mask >> 1) & 033333333333;
71 y = mask - y - ((y >> 1) & 033333333333);
72 return ((y + (y >> 3)) & 030707070707) % 077;
73 }
74
xcb_sumof(uint8_t * list,int len)75 int xcb_sumof(uint8_t *list, int len)
76 {
77 int i, s = 0;
78 for(i=0; i<len; i++) {
79 s += *list;
80 list++;
81 }
82 return s;
83 }
84
85 #ifdef HAVE_LAUNCHD
86 /* Return true and parse if name matches <path to socket>[.<screen>]
87 * Upon success:
88 * host = <path to socket>
89 * protocol = "unix"
90 * display = 0
91 * screen = <screen>
92 */
_xcb_parse_display_path_to_socket(const char * name,char ** host,char ** protocol,int * displayp,int * screenp)93 static int _xcb_parse_display_path_to_socket(const char *name, char **host, char **protocol,
94 int *displayp, int *screenp)
95 {
96 struct stat sbuf;
97 char path[PATH_MAX];
98 int _screen = 0;
99
100 strlcpy(path, name, sizeof(path));
101 if (0 != stat(path, &sbuf)) {
102 char *dot = strrchr(path, '.');
103 if (!dot)
104 return 0;
105 *dot = '\0';
106
107 if (0 != stat(path, &sbuf))
108 return 0;
109
110 _screen = atoi(dot + 1);
111 }
112
113 if (host) {
114 *host = strdup(path);
115 if (!*host)
116 return 0;
117 }
118
119 if (protocol) {
120 *protocol = strdup("unix");
121 if (!*protocol) {
122 if (host)
123 free(*host);
124 return 0;
125 }
126 }
127
128 if (displayp)
129 *displayp = 0;
130
131 if (screenp)
132 *screenp = _screen;
133
134 return 1;
135 }
136 #endif
137
_xcb_parse_display(const char * name,char ** host,char ** protocol,int * displayp,int * screenp)138 static int _xcb_parse_display(const char *name, char **host, char **protocol,
139 int *displayp, int *screenp)
140 {
141 int len, display, screen;
142 char *slash, *colon, *dot, *end;
143
144 if(!name || !*name)
145 name = getenv("DISPLAY");
146 if(!name)
147 return 0;
148
149 #ifdef HAVE_LAUNCHD
150 /* First check for <path to socket>[.<screen>] */
151 if (_xcb_parse_display_path_to_socket(name, host, protocol, displayp, screenp))
152 return 1;
153 #endif
154
155 slash = strrchr(name, '/');
156
157 if (slash) {
158 len = slash - name;
159 if (protocol) {
160 *protocol = malloc(len + 1);
161 if(!*protocol)
162 return 0;
163 memcpy(*protocol, name, len);
164 (*protocol)[len] = '\0';
165 }
166 name = slash + 1;
167 } else
168 if (protocol)
169 *protocol = NULL;
170
171 colon = strrchr(name, ':');
172 if(!colon)
173 goto error_out;
174 len = colon - name;
175 ++colon;
176 display = strtoul(colon, &dot, 10);
177 if(dot == colon)
178 goto error_out;
179 if(*dot == '\0')
180 screen = 0;
181 else
182 {
183 if(*dot != '.')
184 goto error_out;
185 ++dot;
186 screen = strtoul(dot, &end, 10);
187 if(end == dot || *end != '\0')
188 goto error_out;
189 }
190 /* At this point, the display string is fully parsed and valid, but
191 * the caller's memory is untouched. */
192
193 *host = malloc(len + 1);
194 if(!*host)
195 goto error_out;
196 memcpy(*host, name, len);
197 (*host)[len] = '\0';
198 *displayp = display;
199 if(screenp)
200 *screenp = screen;
201 return 1;
202
203 error_out:
204 if (protocol) {
205 free(*protocol);
206 *protocol = NULL;
207 }
208
209 return 0;
210 }
211
xcb_parse_display(const char * name,char ** host,int * displayp,int * screenp)212 int xcb_parse_display(const char *name, char **host, int *displayp,
213 int *screenp)
214 {
215 return _xcb_parse_display(name, host, NULL, displayp, screenp);
216 }
217
218 static int _xcb_open_tcp(const char *host, char *protocol, const unsigned short port);
219 #ifndef _WIN32
220 static int _xcb_open_unix(char *protocol, const char *file);
221 #endif /* !WIN32 */
222 #ifdef HAVE_ABSTRACT_SOCKETS
223 static int _xcb_open_abstract(char *protocol, const char *file, size_t filelen);
224 #endif
225
_xcb_open(const char * host,char * protocol,const int display)226 static int _xcb_open(const char *host, char *protocol, const int display)
227 {
228 int fd;
229 #ifdef __hpux
230 static const char unix_base[] = "/usr/spool/sockets/X11/";
231 #else
232 static const char unix_base[] = "/tmp/.X11-unix/X";
233 #endif
234 const char *base = unix_base;
235 size_t filelen;
236 char *file = NULL;
237 int actual_filelen;
238
239 /* If protocol or host is "unix", fall through to Unix socket code below */
240 if ((!protocol || (strcmp("unix",protocol) != 0)) &&
241 (*host != '\0') && (strcmp("unix",host) != 0))
242 {
243 /* display specifies TCP */
244 unsigned short port = X_TCP_PORT + display;
245 return _xcb_open_tcp(host, protocol, port);
246 }
247
248 #ifndef _WIN32
249 #if defined(HAVE_TSOL_LABEL_H) && defined(HAVE_IS_SYSTEM_LABELED)
250 /* Check special path for Unix sockets under Solaris Trusted Extensions */
251 if (is_system_labeled())
252 {
253 struct stat sbuf;
254 const char *tsol_base = "/var/tsol/doors/.X11-unix/X";
255 char tsol_socket[PATH_MAX];
256
257 snprintf(tsol_socket, sizeof(tsol_socket), "%s%d", tsol_base, display);
258
259 if (stat(tsol_socket, &sbuf) == 0)
260 base = tsol_base;
261 }
262 #endif
263
264 #ifdef HAVE_LAUNCHD
265 struct stat sbuf;
266 if (0 == stat(host, &sbuf)) {
267 file = strdup(host);
268 if(file == NULL)
269 return -1;
270 filelen = actual_filelen = strlen(file);
271 } else
272 #endif
273 {
274 filelen = strlen(base) + 1 + sizeof(display) * 3 + 1;
275 file = malloc(filelen);
276 if(file == NULL)
277 return -1;
278
279 /* display specifies Unix socket */
280 actual_filelen = snprintf(file, filelen, "%s%d", base, display);
281 }
282
283 if(actual_filelen < 0)
284 {
285 free(file);
286 return -1;
287 }
288 /* snprintf may truncate the file */
289 filelen = MIN(actual_filelen, filelen - 1);
290 #ifdef HAVE_ABSTRACT_SOCKETS
291 fd = _xcb_open_abstract(protocol, file, filelen);
292 if (fd >= 0 || (errno != ENOENT && errno != ECONNREFUSED))
293 {
294 free(file);
295 return fd;
296 }
297
298 #endif
299 fd = _xcb_open_unix(protocol, file);
300 free(file);
301
302 if (fd < 0 && !protocol && *host == '\0') {
303 unsigned short port = X_TCP_PORT + display;
304 fd = _xcb_open_tcp(host, protocol, port);
305 }
306
307 return fd;
308 #endif /* !_WIN32 */
309 return -1; /* if control reaches here then something has gone wrong */
310 }
311
_xcb_socket(int family,int type,int proto)312 static int _xcb_socket(int family, int type, int proto)
313 {
314 int fd;
315
316 #ifdef SOCK_CLOEXEC
317 fd = socket(family, type | SOCK_CLOEXEC, proto);
318 if (fd == -1 && errno == EINVAL)
319 #endif
320 {
321 fd = socket(family, type, proto);
322 #ifndef _WIN32
323 if (fd >= 0)
324 fcntl(fd, F_SETFD, FD_CLOEXEC);
325 #endif
326 }
327 return fd;
328 }
329
330
_xcb_do_connect(int fd,const struct sockaddr * addr,int addrlen)331 static int _xcb_do_connect(int fd, const struct sockaddr* addr, int addrlen) {
332 int on = 1;
333
334 if(fd < 0)
335 return -1;
336
337 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on));
338 setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on));
339
340 return connect(fd, addr, addrlen);
341 }
342
_xcb_open_tcp(const char * host,char * protocol,const unsigned short port)343 static int _xcb_open_tcp(const char *host, char *protocol, const unsigned short port)
344 {
345 int fd = -1;
346 #if HAVE_GETADDRINFO
347 struct addrinfo hints;
348 char service[6]; /* "65535" with the trailing '\0' */
349 struct addrinfo *results, *addr;
350 char *bracket;
351 #endif
352
353 if (protocol && strcmp("tcp",protocol) && strcmp("inet",protocol)
354 #ifdef AF_INET6
355 && strcmp("inet6",protocol)
356 #endif
357 )
358 return -1;
359
360 if (*host == '\0')
361 host = "localhost";
362
363 #if HAVE_GETADDRINFO
364 memset(&hints, 0, sizeof(hints));
365 #ifdef AI_NUMERICSERV
366 hints.ai_flags |= AI_NUMERICSERV;
367 #endif
368 hints.ai_family = AF_UNSPEC;
369 hints.ai_socktype = SOCK_STREAM;
370
371 #ifdef AF_INET6
372 /* Allow IPv6 addresses enclosed in brackets. */
373 if(host[0] == '[' && (bracket = strrchr(host, ']')) && bracket[1] == '\0')
374 {
375 *bracket = '\0';
376 ++host;
377 hints.ai_flags |= AI_NUMERICHOST;
378 hints.ai_family = AF_INET6;
379 }
380 #endif
381
382 snprintf(service, sizeof(service), "%hu", port);
383 if(getaddrinfo(host, service, &hints, &results))
384 /* FIXME: use gai_strerror, and fill in error connection */
385 return -1;
386
387 for(addr = results; addr; addr = addr->ai_next)
388 {
389 fd = _xcb_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
390 if (_xcb_do_connect(fd, addr->ai_addr, addr->ai_addrlen) >= 0)
391 break;
392 close(fd);
393 fd = -1;
394 }
395 freeaddrinfo(results);
396 return fd;
397 #else
398 {
399 struct hostent* _h;
400 struct sockaddr_in _s;
401 struct in_addr ** _c;
402
403 if((_h = gethostbyname(host)) == NULL)
404 return -1;
405
406 _c = (struct in_addr**)_h->h_addr_list;
407 fd = -1;
408
409 while(*_c) {
410 _s.sin_family = AF_INET;
411 _s.sin_port = htons(port);
412 _s.sin_addr = *(*_c);
413
414 fd = _xcb_socket(_s.sin_family, SOCK_STREAM, 0);
415 if(_xcb_do_connect(fd, (struct sockaddr*)&_s, sizeof(_s)) >= 0)
416 break;
417
418 close(fd);
419 fd = -1;
420 ++_c;
421 }
422
423 return fd;
424 }
425 #endif
426 }
427
428 #ifndef _WIN32
_xcb_open_unix(char * protocol,const char * file)429 static int _xcb_open_unix(char *protocol, const char *file)
430 {
431 int fd;
432 struct sockaddr_un addr;
433 socklen_t len = sizeof(int);
434 int val;
435
436 if (protocol && strcmp("unix",protocol))
437 return -1;
438
439 strcpy(addr.sun_path, file);
440 addr.sun_family = AF_UNIX;
441 #ifdef HAVE_SOCKADDR_SUN_LEN
442 addr.sun_len = SUN_LEN(&addr);
443 #endif
444 fd = _xcb_socket(AF_UNIX, SOCK_STREAM, 0);
445 if(fd == -1)
446 return -1;
447 if(getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0 && val < 64 * 1024)
448 {
449 val = 64 * 1024;
450 setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof(int));
451 }
452 if(connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
453 close(fd);
454 return -1;
455 }
456 return fd;
457 }
458 #endif /* !_WIN32 */
459
460 #ifdef HAVE_ABSTRACT_SOCKETS
_xcb_open_abstract(char * protocol,const char * file,size_t filelen)461 static int _xcb_open_abstract(char *protocol, const char *file, size_t filelen)
462 {
463 int fd;
464 struct sockaddr_un addr = {0};
465 socklen_t namelen;
466
467 if (protocol && strcmp("unix",protocol))
468 return -1;
469
470 strcpy(addr.sun_path + 1, file);
471 addr.sun_family = AF_UNIX;
472 namelen = offsetof(struct sockaddr_un, sun_path) + 1 + filelen;
473 #ifdef HAVE_SOCKADDR_SUN_LEN
474 addr.sun_len = 1 + filelen;
475 #endif
476 fd = _xcb_socket(AF_UNIX, SOCK_STREAM, 0);
477 if (fd == -1)
478 return -1;
479 if (connect(fd, (struct sockaddr *) &addr, namelen) == -1) {
480 close(fd);
481 return -1;
482 }
483 return fd;
484 }
485 #endif
486
xcb_connect(const char * displayname,int * screenp)487 xcb_connection_t *xcb_connect(const char *displayname, int *screenp)
488 {
489 return xcb_connect_to_display_with_auth_info(displayname, NULL, screenp);
490 }
491
xcb_connect_to_display_with_auth_info(const char * displayname,xcb_auth_info_t * auth,int * screenp)492 xcb_connection_t *xcb_connect_to_display_with_auth_info(const char *displayname, xcb_auth_info_t *auth, int *screenp)
493 {
494 int fd, display = 0;
495 char *host = NULL;
496 char *protocol = NULL;
497 xcb_auth_info_t ourauth;
498 xcb_connection_t *c;
499
500 int parsed = _xcb_parse_display(displayname, &host, &protocol, &display, screenp);
501
502 if(!parsed) {
503 c = _xcb_conn_ret_error(XCB_CONN_CLOSED_PARSE_ERR);
504 goto out;
505 }
506
507 #ifdef _WIN32
508 WSADATA wsaData;
509 if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
510 c = _xcb_conn_ret_error(XCB_CONN_ERROR);
511 goto out;
512 }
513 #endif
514
515 fd = _xcb_open(host, protocol, display);
516
517 if(fd == -1) {
518 c = _xcb_conn_ret_error(XCB_CONN_ERROR);
519 #ifdef _WIN32
520 WSACleanup();
521 #endif
522 goto out;
523 }
524
525 if(auth) {
526 c = xcb_connect_to_fd(fd, auth);
527 goto out;
528 }
529
530 if(_xcb_get_auth_info(fd, &ourauth, display))
531 {
532 c = xcb_connect_to_fd(fd, &ourauth);
533 free(ourauth.name);
534 free(ourauth.data);
535 }
536 else
537 c = xcb_connect_to_fd(fd, 0);
538
539 if(c->has_error)
540 goto out;
541
542 /* Make sure requested screen number is in bounds for this server */
543 if((screenp != NULL) && (*screenp >= (int) c->setup->roots_len)) {
544 xcb_disconnect(c);
545 c = _xcb_conn_ret_error(XCB_CONN_CLOSED_INVALID_SCREEN);
546 goto out;
547 }
548
549 out:
550 free(host);
551 free(protocol);
552 return c;
553 }
554