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 */
51struct 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
86struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
87{
88	return wpa_ctrl_open2(ctrl_path, NULL);
89}
90
91
92struct 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++;
117try_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
233void 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 */
252void 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
284void 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
294struct 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
445char * 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
455void 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
468int 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;
503retry_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
569static 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
585int wpa_ctrl_attach(struct wpa_ctrl *ctrl)
586{
587	return wpa_ctrl_attach_helper(ctrl, 1);
588}
589
590
591int 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
599int 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
611int 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
624int 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
639struct 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
700void wpa_ctrl_close(struct wpa_ctrl *ctrl)
701{
702	CloseHandle(ctrl->pipe);
703	os_free(ctrl);
704}
705
706
707int 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
725int 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
735int 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
745int 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