1 /*
2 * wpa_supplicant/hostapd control interface library
3 * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #ifdef CONFIG_CTRL_IFACE
12
13 #ifdef CONFIG_CTRL_IFACE_UNIX
14 #include <sys/un.h>
15 #include <unistd.h>
16 #include <fcntl.h>
17 #endif /* CONFIG_CTRL_IFACE_UNIX */
18 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
19 #include <netdb.h>
20 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
21
22 #ifdef ANDROID
23 #include <dirent.h>
24 #include <sys/stat.h>
25 #include <cutils/sockets.h>
26 #include "private/android_filesystem_config.h"
27 #endif /* ANDROID */
28
29 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
30 #include <net/if.h>
31 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
32
33 #include "wpa_ctrl.h"
34 #include "common.h"
35
36
37 #if defined(CONFIG_CTRL_IFACE_UNIX) || defined(CONFIG_CTRL_IFACE_UDP)
38 #define CTRL_IFACE_SOCKET
39 #endif /* CONFIG_CTRL_IFACE_UNIX || CONFIG_CTRL_IFACE_UDP */
40
41
42 /**
43 * struct wpa_ctrl - Internal structure for control interface library
44 *
45 * This structure is used by the wpa_supplicant/hostapd control interface
46 * library to store internal data. Programs using the library should not touch
47 * this data directly. They can only use the pointer to the data structure as
48 * an identifier for the control interface connection and use this as one of
49 * the arguments for most of the control interface library functions.
50 */
51 struct wpa_ctrl {
52 #ifdef CONFIG_CTRL_IFACE_UDP
53 int s;
54 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
55 struct sockaddr_in6 local;
56 struct sockaddr_in6 dest;
57 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
58 struct sockaddr_in local;
59 struct sockaddr_in dest;
60 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
61 char *cookie;
62 char *remote_ifname;
63 char *remote_ip;
64 #endif /* CONFIG_CTRL_IFACE_UDP */
65 #ifdef CONFIG_CTRL_IFACE_UNIX
66 int s;
67 struct sockaddr_un local;
68 struct sockaddr_un dest;
69 #endif /* CONFIG_CTRL_IFACE_UNIX */
70 #ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
71 HANDLE pipe;
72 #endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
73 };
74
75
76 #ifdef CONFIG_CTRL_IFACE_UNIX
77
78 #ifndef CONFIG_CTRL_IFACE_CLIENT_DIR
79 #define CONFIG_CTRL_IFACE_CLIENT_DIR "/tmp"
80 #endif /* CONFIG_CTRL_IFACE_CLIENT_DIR */
81 #ifndef CONFIG_CTRL_IFACE_CLIENT_PREFIX
82 #define CONFIG_CTRL_IFACE_CLIENT_PREFIX "wpa_ctrl_"
83 #endif /* CONFIG_CTRL_IFACE_CLIENT_PREFIX */
84
85
wpa_ctrl_open(const char * ctrl_path)86 struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
87 {
88 return wpa_ctrl_open2(ctrl_path, NULL);
89 }
90
91
wpa_ctrl_open2(const char * ctrl_path,const char * cli_path)92 struct wpa_ctrl * wpa_ctrl_open2(const char *ctrl_path,
93 const char *cli_path)
94 {
95 struct wpa_ctrl *ctrl;
96 static int counter = 0;
97 int ret;
98 size_t res;
99 int tries = 0;
100 int flags;
101
102 if (ctrl_path == NULL)
103 return NULL;
104
105 ctrl = os_zalloc(sizeof(*ctrl));
106 if (ctrl == NULL)
107 return NULL;
108
109 ctrl->s = socket(PF_UNIX, SOCK_DGRAM, 0);
110 if (ctrl->s < 0) {
111 os_free(ctrl);
112 return NULL;
113 }
114
115 ctrl->local.sun_family = AF_UNIX;
116 counter++;
117 try_again:
118 if (cli_path && cli_path[0] == '/') {
119 ret = os_snprintf(ctrl->local.sun_path,
120 sizeof(ctrl->local.sun_path),
121 "%s/" CONFIG_CTRL_IFACE_CLIENT_PREFIX "%d-%d",
122 cli_path, (int) getpid(), counter);
123 } else {
124 ret = os_snprintf(ctrl->local.sun_path,
125 sizeof(ctrl->local.sun_path),
126 CONFIG_CTRL_IFACE_CLIENT_DIR "/"
127 CONFIG_CTRL_IFACE_CLIENT_PREFIX "%d-%d",
128 (int) getpid(), counter);
129 }
130 if (os_snprintf_error(sizeof(ctrl->local.sun_path), ret)) {
131 close(ctrl->s);
132 os_free(ctrl);
133 return NULL;
134 }
135 tries++;
136 if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
137 sizeof(ctrl->local)) < 0) {
138 if (errno == EADDRINUSE && tries < 2) {
139 /*
140 * getpid() returns unique identifier for this instance
141 * of wpa_ctrl, so the existing socket file must have
142 * been left by unclean termination of an earlier run.
143 * Remove the file and try again.
144 */
145 unlink(ctrl->local.sun_path);
146 goto try_again;
147 }
148 close(ctrl->s);
149 os_free(ctrl);
150 return NULL;
151 }
152
153 #ifdef ANDROID
154 chmod(ctrl->local.sun_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
155 /* Set group even if we do not have privileges to change owner */
156 chown(ctrl->local.sun_path, -1, AID_WIFI);
157 chown(ctrl->local.sun_path, AID_SYSTEM, AID_WIFI);
158
159 if (os_strncmp(ctrl_path, "@android:", 9) == 0) {
160 if (socket_local_client_connect(
161 ctrl->s, ctrl_path + 9,
162 ANDROID_SOCKET_NAMESPACE_RESERVED,
163 SOCK_DGRAM) < 0) {
164 close(ctrl->s);
165 unlink(ctrl->local.sun_path);
166 os_free(ctrl);
167 return NULL;
168 }
169 return ctrl;
170 }
171
172 /*
173 * If the ctrl_path isn't an absolute pathname, assume that
174 * it's the name of a socket in the Android reserved namespace.
175 * Otherwise, it's a normal UNIX domain socket appearing in the
176 * filesystem.
177 */
178 if (*ctrl_path != '/') {
179 char buf[21];
180 os_snprintf(buf, sizeof(buf), "wpa_%s", ctrl_path);
181 if (socket_local_client_connect(
182 ctrl->s, buf,
183 ANDROID_SOCKET_NAMESPACE_RESERVED,
184 SOCK_DGRAM) < 0) {
185 close(ctrl->s);
186 unlink(ctrl->local.sun_path);
187 os_free(ctrl);
188 return NULL;
189 }
190 return ctrl;
191 }
192 #endif /* ANDROID */
193
194 ctrl->dest.sun_family = AF_UNIX;
195 if (os_strncmp(ctrl_path, "@abstract:", 10) == 0) {
196 ctrl->dest.sun_path[0] = '\0';
197 os_strlcpy(ctrl->dest.sun_path + 1, ctrl_path + 10,
198 sizeof(ctrl->dest.sun_path) - 1);
199 } else {
200 res = os_strlcpy(ctrl->dest.sun_path, ctrl_path,
201 sizeof(ctrl->dest.sun_path));
202 if (res >= sizeof(ctrl->dest.sun_path)) {
203 close(ctrl->s);
204 os_free(ctrl);
205 return NULL;
206 }
207 }
208 if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
209 sizeof(ctrl->dest)) < 0) {
210 close(ctrl->s);
211 unlink(ctrl->local.sun_path);
212 os_free(ctrl);
213 return NULL;
214 }
215
216 /*
217 * Make socket non-blocking so that we don't hang forever if
218 * target dies unexpectedly.
219 */
220 flags = fcntl(ctrl->s, F_GETFL);
221 if (flags >= 0) {
222 flags |= O_NONBLOCK;
223 if (fcntl(ctrl->s, F_SETFL, flags) < 0) {
224 perror("fcntl(ctrl->s, O_NONBLOCK)");
225 /* Not fatal, continue on.*/
226 }
227 }
228
229 return ctrl;
230 }
231
232
wpa_ctrl_close(struct wpa_ctrl * ctrl)233 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
234 {
235 if (ctrl == NULL)
236 return;
237 unlink(ctrl->local.sun_path);
238 if (ctrl->s >= 0)
239 close(ctrl->s);
240 os_free(ctrl);
241 }
242
243
244 #ifdef ANDROID
245 /**
246 * wpa_ctrl_cleanup() - Delete any local UNIX domain socket files that
247 * may be left over from clients that were previously connected to
248 * wpa_supplicant. This keeps these files from being orphaned in the
249 * event of crashes that prevented them from being removed as part
250 * of the normal orderly shutdown.
251 */
wpa_ctrl_cleanup(void)252 void wpa_ctrl_cleanup(void)
253 {
254 DIR *dir;
255 struct dirent entry;
256 struct dirent *result;
257 size_t dirnamelen;
258 size_t maxcopy;
259 char pathname[PATH_MAX];
260 char *namep;
261
262 if ((dir = opendir(CONFIG_CTRL_IFACE_CLIENT_DIR)) == NULL)
263 return;
264
265 dirnamelen = (size_t) os_snprintf(pathname, sizeof(pathname), "%s/",
266 CONFIG_CTRL_IFACE_CLIENT_DIR);
267 if (dirnamelen >= sizeof(pathname)) {
268 closedir(dir);
269 return;
270 }
271 namep = pathname + dirnamelen;
272 maxcopy = PATH_MAX - dirnamelen;
273 while (readdir_r(dir, &entry, &result) == 0 && result != NULL) {
274 if (os_strlcpy(namep, entry.d_name, maxcopy) < maxcopy)
275 unlink(pathname);
276 }
277 closedir(dir);
278 }
279 #endif /* ANDROID */
280
281 #else /* CONFIG_CTRL_IFACE_UNIX */
282
283 #ifdef ANDROID
wpa_ctrl_cleanup(void)284 void wpa_ctrl_cleanup(void)
285 {
286 }
287 #endif /* ANDROID */
288
289 #endif /* CONFIG_CTRL_IFACE_UNIX */
290
291
292 #ifdef CONFIG_CTRL_IFACE_UDP
293
wpa_ctrl_open(const char * ctrl_path)294 struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
295 {
296 struct wpa_ctrl *ctrl;
297 char buf[128];
298 size_t len;
299 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
300 struct hostent *h;
301 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
302
303 ctrl = os_zalloc(sizeof(*ctrl));
304 if (ctrl == NULL)
305 return NULL;
306
307 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
308 ctrl->s = socket(PF_INET6, SOCK_DGRAM, 0);
309 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
310 ctrl->s = socket(PF_INET, SOCK_DGRAM, 0);
311 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
312 if (ctrl->s < 0) {
313 perror("socket");
314 os_free(ctrl);
315 return NULL;
316 }
317
318 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
319 ctrl->local.sin6_family = AF_INET6;
320 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
321 ctrl->local.sin6_addr = in6addr_any;
322 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
323 inet_pton(AF_INET6, "::1", &ctrl->local.sin6_addr);
324 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
325 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
326 ctrl->local.sin_family = AF_INET;
327 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
328 ctrl->local.sin_addr.s_addr = INADDR_ANY;
329 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
330 ctrl->local.sin_addr.s_addr = htonl((127 << 24) | 1);
331 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
332 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
333
334 if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
335 sizeof(ctrl->local)) < 0) {
336 close(ctrl->s);
337 os_free(ctrl);
338 return NULL;
339 }
340
341 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
342 ctrl->dest.sin6_family = AF_INET6;
343 inet_pton(AF_INET6, "::1", &ctrl->dest.sin6_addr);
344 ctrl->dest.sin6_port = htons(WPA_CTRL_IFACE_PORT);
345 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
346 ctrl->dest.sin_family = AF_INET;
347 ctrl->dest.sin_addr.s_addr = htonl((127 << 24) | 1);
348 ctrl->dest.sin_port = htons(WPA_CTRL_IFACE_PORT);
349 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
350
351 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
352 if (ctrl_path) {
353 char *port, *name;
354 int port_id;
355 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
356 char *scope;
357 int scope_id = 0;
358 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
359
360 name = os_strdup(ctrl_path);
361 if (name == NULL) {
362 close(ctrl->s);
363 os_free(ctrl);
364 return NULL;
365 }
366 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
367 port = os_strchr(name, ',');
368 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
369 port = os_strchr(name, ':');
370 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
371
372 if (port) {
373 port_id = atoi(&port[1]);
374 port[0] = '\0';
375 } else
376 port_id = WPA_CTRL_IFACE_PORT;
377
378 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
379 scope = os_strchr(name, '%');
380 if (scope) {
381 scope_id = if_nametoindex(&scope[1]);
382 scope[0] = '\0';
383 }
384 h = gethostbyname2(name, AF_INET6);
385 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
386 h = gethostbyname(name);
387 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
388 ctrl->remote_ip = os_strdup(name);
389 os_free(name);
390 if (h == NULL) {
391 perror("gethostbyname");
392 close(ctrl->s);
393 os_free(ctrl->remote_ip);
394 os_free(ctrl);
395 return NULL;
396 }
397 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
398 ctrl->dest.sin6_scope_id = scope_id;
399 ctrl->dest.sin6_port = htons(port_id);
400 os_memcpy(&ctrl->dest.sin6_addr, h->h_addr, h->h_length);
401 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
402 ctrl->dest.sin_port = htons(port_id);
403 os_memcpy(&ctrl->dest.sin_addr.s_addr, h->h_addr, h->h_length);
404 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
405 } else
406 ctrl->remote_ip = os_strdup("localhost");
407 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
408
409 if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
410 sizeof(ctrl->dest)) < 0) {
411 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
412 char addr[INET6_ADDRSTRLEN];
413 wpa_printf(MSG_ERROR, "connect(%s:%d) failed: %s",
414 inet_ntop(AF_INET6, &ctrl->dest.sin6_addr, addr,
415 sizeof(ctrl->dest)),
416 ntohs(ctrl->dest.sin6_port),
417 strerror(errno));
418 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
419 wpa_printf(MSG_ERROR, "connect(%s:%d) failed: %s",
420 inet_ntoa(ctrl->dest.sin_addr),
421 ntohs(ctrl->dest.sin_port),
422 strerror(errno));
423 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
424 close(ctrl->s);
425 os_free(ctrl->remote_ip);
426 os_free(ctrl);
427 return NULL;
428 }
429
430 len = sizeof(buf) - 1;
431 if (wpa_ctrl_request(ctrl, "GET_COOKIE", 10, buf, &len, NULL) == 0) {
432 buf[len] = '\0';
433 ctrl->cookie = os_strdup(buf);
434 }
435
436 if (wpa_ctrl_request(ctrl, "IFNAME", 6, buf, &len, NULL) == 0) {
437 buf[len] = '\0';
438 ctrl->remote_ifname = os_strdup(buf);
439 }
440
441 return ctrl;
442 }
443
444
wpa_ctrl_get_remote_ifname(struct wpa_ctrl * ctrl)445 char * wpa_ctrl_get_remote_ifname(struct wpa_ctrl *ctrl)
446 {
447 #define WPA_CTRL_MAX_PS_NAME 100
448 static char ps[WPA_CTRL_MAX_PS_NAME] = {};
449 os_snprintf(ps, WPA_CTRL_MAX_PS_NAME, "%s/%s",
450 ctrl->remote_ip, ctrl->remote_ifname);
451 return ps;
452 }
453
454
wpa_ctrl_close(struct wpa_ctrl * ctrl)455 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
456 {
457 close(ctrl->s);
458 os_free(ctrl->cookie);
459 os_free(ctrl->remote_ifname);
460 os_free(ctrl->remote_ip);
461 os_free(ctrl);
462 }
463
464 #endif /* CONFIG_CTRL_IFACE_UDP */
465
466
467 #ifdef CTRL_IFACE_SOCKET
wpa_ctrl_request(struct wpa_ctrl * ctrl,const char * cmd,size_t cmd_len,char * reply,size_t * reply_len,void (* msg_cb)(char * msg,size_t len))468 int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
469 char *reply, size_t *reply_len,
470 void (*msg_cb)(char *msg, size_t len))
471 {
472 struct timeval tv;
473 struct os_reltime started_at;
474 int res;
475 fd_set rfds;
476 const char *_cmd;
477 char *cmd_buf = NULL;
478 size_t _cmd_len;
479
480 #ifdef CONFIG_CTRL_IFACE_UDP
481 if (ctrl->cookie) {
482 char *pos;
483 _cmd_len = os_strlen(ctrl->cookie) + 1 + cmd_len;
484 cmd_buf = os_malloc(_cmd_len);
485 if (cmd_buf == NULL)
486 return -1;
487 _cmd = cmd_buf;
488 pos = cmd_buf;
489 os_strlcpy(pos, ctrl->cookie, _cmd_len);
490 pos += os_strlen(ctrl->cookie);
491 *pos++ = ' ';
492 os_memcpy(pos, cmd, cmd_len);
493 } else
494 #endif /* CONFIG_CTRL_IFACE_UDP */
495 {
496 _cmd = cmd;
497 _cmd_len = cmd_len;
498 }
499
500 errno = 0;
501 started_at.sec = 0;
502 started_at.usec = 0;
503 retry_send:
504 if (send(ctrl->s, _cmd, _cmd_len, 0) < 0) {
505 if (errno == EAGAIN || errno == EBUSY || errno == EWOULDBLOCK)
506 {
507 /*
508 * Must be a non-blocking socket... Try for a bit
509 * longer before giving up.
510 */
511 if (started_at.sec == 0)
512 os_get_reltime(&started_at);
513 else {
514 struct os_reltime n;
515 os_get_reltime(&n);
516 /* Try for a few seconds. */
517 if (os_reltime_expired(&n, &started_at, 5))
518 goto send_err;
519 }
520 os_sleep(1, 0);
521 goto retry_send;
522 }
523 send_err:
524 os_free(cmd_buf);
525 return -1;
526 }
527 os_free(cmd_buf);
528
529 for (;;) {
530 tv.tv_sec = 10;
531 tv.tv_usec = 0;
532 FD_ZERO(&rfds);
533 FD_SET(ctrl->s, &rfds);
534 res = select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
535 if (res < 0 && errno == EINTR)
536 continue;
537 if (res < 0)
538 return res;
539 if (FD_ISSET(ctrl->s, &rfds)) {
540 res = recv(ctrl->s, reply, *reply_len, 0);
541 if (res < 0)
542 return res;
543 if (res > 0 && reply[0] == '<') {
544 /* This is an unsolicited message from
545 * wpa_supplicant, not the reply to the
546 * request. Use msg_cb to report this to the
547 * caller. */
548 if (msg_cb) {
549 /* Make sure the message is nul
550 * terminated. */
551 if ((size_t) res == *reply_len)
552 res = (*reply_len) - 1;
553 reply[res] = '\0';
554 msg_cb(reply, res);
555 }
556 continue;
557 }
558 *reply_len = res;
559 break;
560 } else {
561 return -2;
562 }
563 }
564 return 0;
565 }
566 #endif /* CTRL_IFACE_SOCKET */
567
568
wpa_ctrl_attach_helper(struct wpa_ctrl * ctrl,int attach)569 static int wpa_ctrl_attach_helper(struct wpa_ctrl *ctrl, int attach)
570 {
571 char buf[10];
572 int ret;
573 size_t len = 10;
574
575 ret = wpa_ctrl_request(ctrl, attach ? "ATTACH" : "DETACH", 6,
576 buf, &len, NULL);
577 if (ret < 0)
578 return ret;
579 if (len == 3 && os_memcmp(buf, "OK\n", 3) == 0)
580 return 0;
581 return -1;
582 }
583
584
wpa_ctrl_attach(struct wpa_ctrl * ctrl)585 int wpa_ctrl_attach(struct wpa_ctrl *ctrl)
586 {
587 return wpa_ctrl_attach_helper(ctrl, 1);
588 }
589
590
wpa_ctrl_detach(struct wpa_ctrl * ctrl)591 int wpa_ctrl_detach(struct wpa_ctrl *ctrl)
592 {
593 return wpa_ctrl_attach_helper(ctrl, 0);
594 }
595
596
597 #ifdef CTRL_IFACE_SOCKET
598
wpa_ctrl_recv(struct wpa_ctrl * ctrl,char * reply,size_t * reply_len)599 int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
600 {
601 int res;
602
603 res = recv(ctrl->s, reply, *reply_len, 0);
604 if (res < 0)
605 return res;
606 *reply_len = res;
607 return 0;
608 }
609
610
wpa_ctrl_pending(struct wpa_ctrl * ctrl)611 int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
612 {
613 struct timeval tv;
614 fd_set rfds;
615 tv.tv_sec = 0;
616 tv.tv_usec = 0;
617 FD_ZERO(&rfds);
618 FD_SET(ctrl->s, &rfds);
619 select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
620 return FD_ISSET(ctrl->s, &rfds);
621 }
622
623
wpa_ctrl_get_fd(struct wpa_ctrl * ctrl)624 int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
625 {
626 return ctrl->s;
627 }
628
629 #endif /* CTRL_IFACE_SOCKET */
630
631
632 #ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
633
634 #ifndef WPA_SUPPLICANT_NAMED_PIPE
635 #define WPA_SUPPLICANT_NAMED_PIPE "WpaSupplicant"
636 #endif
637 #define NAMED_PIPE_PREFIX TEXT("\\\\.\\pipe\\") TEXT(WPA_SUPPLICANT_NAMED_PIPE)
638
wpa_ctrl_open(const char * ctrl_path)639 struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
640 {
641 struct wpa_ctrl *ctrl;
642 DWORD mode;
643 TCHAR name[256];
644 int i, ret;
645
646 ctrl = os_malloc(sizeof(*ctrl));
647 if (ctrl == NULL)
648 return NULL;
649 os_memset(ctrl, 0, sizeof(*ctrl));
650
651 #ifdef UNICODE
652 if (ctrl_path == NULL)
653 ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX);
654 else
655 ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX TEXT("-%S"),
656 ctrl_path);
657 #else /* UNICODE */
658 if (ctrl_path == NULL)
659 ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX);
660 else
661 ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX "-%s",
662 ctrl_path);
663 #endif /* UNICODE */
664 if (os_snprintf_error(256, ret)) {
665 os_free(ctrl);
666 return NULL;
667 }
668
669 for (i = 0; i < 10; i++) {
670 ctrl->pipe = CreateFile(name, GENERIC_READ | GENERIC_WRITE, 0,
671 NULL, OPEN_EXISTING, 0, NULL);
672 /*
673 * Current named pipe server side in wpa_supplicant is
674 * re-opening the pipe for new clients only after the previous
675 * one is taken into use. This leaves a small window for race
676 * conditions when two connections are being opened at almost
677 * the same time. Retry if that was the case.
678 */
679 if (ctrl->pipe != INVALID_HANDLE_VALUE ||
680 GetLastError() != ERROR_PIPE_BUSY)
681 break;
682 WaitNamedPipe(name, 1000);
683 }
684 if (ctrl->pipe == INVALID_HANDLE_VALUE) {
685 os_free(ctrl);
686 return NULL;
687 }
688
689 mode = PIPE_READMODE_MESSAGE;
690 if (!SetNamedPipeHandleState(ctrl->pipe, &mode, NULL, NULL)) {
691 CloseHandle(ctrl->pipe);
692 os_free(ctrl);
693 return NULL;
694 }
695
696 return ctrl;
697 }
698
699
wpa_ctrl_close(struct wpa_ctrl * ctrl)700 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
701 {
702 CloseHandle(ctrl->pipe);
703 os_free(ctrl);
704 }
705
706
wpa_ctrl_request(struct wpa_ctrl * ctrl,const char * cmd,size_t cmd_len,char * reply,size_t * reply_len,void (* msg_cb)(char * msg,size_t len))707 int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
708 char *reply, size_t *reply_len,
709 void (*msg_cb)(char *msg, size_t len))
710 {
711 DWORD written;
712 DWORD readlen = *reply_len;
713
714 if (!WriteFile(ctrl->pipe, cmd, cmd_len, &written, NULL))
715 return -1;
716
717 if (!ReadFile(ctrl->pipe, reply, *reply_len, &readlen, NULL))
718 return -1;
719 *reply_len = readlen;
720
721 return 0;
722 }
723
724
wpa_ctrl_recv(struct wpa_ctrl * ctrl,char * reply,size_t * reply_len)725 int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
726 {
727 DWORD len = *reply_len;
728 if (!ReadFile(ctrl->pipe, reply, *reply_len, &len, NULL))
729 return -1;
730 *reply_len = len;
731 return 0;
732 }
733
734
wpa_ctrl_pending(struct wpa_ctrl * ctrl)735 int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
736 {
737 DWORD left;
738
739 if (!PeekNamedPipe(ctrl->pipe, NULL, 0, NULL, &left, NULL))
740 return -1;
741 return left ? 1 : 0;
742 }
743
744
wpa_ctrl_get_fd(struct wpa_ctrl * ctrl)745 int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
746 {
747 return -1;
748 }
749
750 #endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
751
752 #endif /* CONFIG_CTRL_IFACE */
753