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