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 <cutils/sockets.h>
25 #include "private/android_filesystem_config.h"
26 #endif /* ANDROID */
27
28 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
29 #include <net/if.h>
30 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
31
32 #include "wpa_ctrl.h"
33 #include "common.h"
34
35
36 #if defined(CONFIG_CTRL_IFACE_UNIX) || defined(CONFIG_CTRL_IFACE_UDP)
37 #define CTRL_IFACE_SOCKET
38 #endif /* CONFIG_CTRL_IFACE_UNIX || CONFIG_CTRL_IFACE_UDP */
39
40
41 /**
42 * struct wpa_ctrl - Internal structure for control interface library
43 *
44 * This structure is used by the wpa_supplicant/hostapd control interface
45 * library to store internal data. Programs using the library should not touch
46 * this data directly. They can only use the pointer to the data structure as
47 * an identifier for the control interface connection and use this as one of
48 * the arguments for most of the control interface library functions.
49 */
50 struct wpa_ctrl {
51 #ifdef CONFIG_CTRL_IFACE_UDP
52 int s;
53 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
54 struct sockaddr_in6 local;
55 struct sockaddr_in6 dest;
56 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
57 struct sockaddr_in local;
58 struct sockaddr_in dest;
59 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
60 char *cookie;
61 char *remote_ifname;
62 char *remote_ip;
63 #endif /* CONFIG_CTRL_IFACE_UDP */
64 #ifdef CONFIG_CTRL_IFACE_UNIX
65 int s;
66 struct sockaddr_un local;
67 struct sockaddr_un dest;
68 #endif /* CONFIG_CTRL_IFACE_UNIX */
69 #ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
70 HANDLE pipe;
71 #endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
72 };
73
74
75 #ifdef CONFIG_CTRL_IFACE_UNIX
76
77 #ifndef CONFIG_CTRL_IFACE_CLIENT_DIR
78 #define CONFIG_CTRL_IFACE_CLIENT_DIR "/tmp"
79 #endif /* CONFIG_CTRL_IFACE_CLIENT_DIR */
80 #ifndef CONFIG_CTRL_IFACE_CLIENT_PREFIX
81 #define CONFIG_CTRL_IFACE_CLIENT_PREFIX "wpa_ctrl_"
82 #endif /* CONFIG_CTRL_IFACE_CLIENT_PREFIX */
83
84
wpa_ctrl_open(const char * ctrl_path)85 struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
86 {
87 struct wpa_ctrl *ctrl;
88 static int counter = 0;
89 int ret;
90 size_t res;
91 int tries = 0;
92 int flags;
93
94 if (ctrl_path == NULL)
95 return NULL;
96
97 ctrl = os_malloc(sizeof(*ctrl));
98 if (ctrl == NULL)
99 return NULL;
100 os_memset(ctrl, 0, sizeof(*ctrl));
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 (ret < 0 || (size_t) ret >= sizeof(ctrl->local.sun_path)) {
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_malloc(sizeof(*ctrl));
287 if (ctrl == NULL)
288 return NULL;
289 os_memset(ctrl, 0, sizeof(*ctrl));
290
291 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
292 ctrl->s = socket(PF_INET6, SOCK_DGRAM, 0);
293 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
294 ctrl->s = socket(PF_INET, SOCK_DGRAM, 0);
295 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
296 if (ctrl->s < 0) {
297 perror("socket");
298 os_free(ctrl);
299 return NULL;
300 }
301
302 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
303 ctrl->local.sin6_family = AF_INET6;
304 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
305 ctrl->local.sin6_addr = in6addr_any;
306 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
307 inet_pton(AF_INET6, "::1", &ctrl->local.sin6_addr);
308 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
309 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
310 ctrl->local.sin_family = AF_INET;
311 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
312 ctrl->local.sin_addr.s_addr = INADDR_ANY;
313 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
314 ctrl->local.sin_addr.s_addr = htonl((127 << 24) | 1);
315 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
316 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
317
318 if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
319 sizeof(ctrl->local)) < 0) {
320 close(ctrl->s);
321 os_free(ctrl);
322 return NULL;
323 }
324
325 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
326 ctrl->dest.sin6_family = AF_INET6;
327 inet_pton(AF_INET6, "::1", &ctrl->dest.sin6_addr);
328 ctrl->dest.sin6_port = htons(WPA_CTRL_IFACE_PORT);
329 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
330 ctrl->dest.sin_family = AF_INET;
331 ctrl->dest.sin_addr.s_addr = htonl((127 << 24) | 1);
332 ctrl->dest.sin_port = htons(WPA_CTRL_IFACE_PORT);
333 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
334
335 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
336 if (ctrl_path) {
337 char *port, *name;
338 int port_id;
339 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
340 char *scope;
341 int scope_id = 0;
342 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
343
344 name = os_strdup(ctrl_path);
345 if (name == NULL) {
346 close(ctrl->s);
347 os_free(ctrl);
348 return NULL;
349 }
350 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
351 port = os_strchr(name, ',');
352 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
353 port = os_strchr(name, ':');
354 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
355
356 if (port) {
357 port_id = atoi(&port[1]);
358 port[0] = '\0';
359 } else
360 port_id = WPA_CTRL_IFACE_PORT;
361
362 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
363 scope = os_strchr(name, '%');
364 if (scope) {
365 scope_id = if_nametoindex(&scope[1]);
366 scope[0] = '\0';
367 }
368 h = gethostbyname2(name, AF_INET6);
369 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
370 h = gethostbyname(name);
371 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
372 ctrl->remote_ip = os_strdup(name);
373 os_free(name);
374 if (h == NULL) {
375 perror("gethostbyname");
376 close(ctrl->s);
377 os_free(ctrl->remote_ip);
378 os_free(ctrl);
379 return NULL;
380 }
381 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
382 ctrl->dest.sin6_scope_id = scope_id;
383 ctrl->dest.sin6_port = htons(port_id);
384 os_memcpy(&ctrl->dest.sin6_addr, h->h_addr, h->h_length);
385 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
386 ctrl->dest.sin_port = htons(port_id);
387 os_memcpy(&ctrl->dest.sin_addr.s_addr, h->h_addr, h->h_length);
388 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
389 } else
390 ctrl->remote_ip = os_strdup("localhost");
391 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
392
393 if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
394 sizeof(ctrl->dest)) < 0) {
395 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
396 char addr[INET6_ADDRSTRLEN];
397 wpa_printf(MSG_ERROR, "connect(%s:%d) failed: %s",
398 inet_ntop(AF_INET6, &ctrl->dest.sin6_addr, addr,
399 sizeof(ctrl->dest)),
400 ntohs(ctrl->dest.sin6_port),
401 strerror(errno));
402 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
403 wpa_printf(MSG_ERROR, "connect(%s:%d) failed: %s",
404 inet_ntoa(ctrl->dest.sin_addr),
405 ntohs(ctrl->dest.sin_port),
406 strerror(errno));
407 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
408 close(ctrl->s);
409 os_free(ctrl->remote_ip);
410 os_free(ctrl);
411 return NULL;
412 }
413
414 len = sizeof(buf) - 1;
415 if (wpa_ctrl_request(ctrl, "GET_COOKIE", 10, buf, &len, NULL) == 0) {
416 buf[len] = '\0';
417 ctrl->cookie = os_strdup(buf);
418 }
419
420 if (wpa_ctrl_request(ctrl, "IFNAME", 6, buf, &len, NULL) == 0) {
421 buf[len] = '\0';
422 ctrl->remote_ifname = os_strdup(buf);
423 }
424
425 return ctrl;
426 }
427
428
wpa_ctrl_get_remote_ifname(struct wpa_ctrl * ctrl)429 char * wpa_ctrl_get_remote_ifname(struct wpa_ctrl *ctrl)
430 {
431 #define WPA_CTRL_MAX_PS_NAME 100
432 static char ps[WPA_CTRL_MAX_PS_NAME] = {};
433 os_snprintf(ps, WPA_CTRL_MAX_PS_NAME, "%s/%s",
434 ctrl->remote_ip, ctrl->remote_ifname);
435 return ps;
436 }
437
438
wpa_ctrl_close(struct wpa_ctrl * ctrl)439 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
440 {
441 close(ctrl->s);
442 os_free(ctrl->cookie);
443 os_free(ctrl->remote_ifname);
444 os_free(ctrl->remote_ip);
445 os_free(ctrl);
446 }
447
448 #endif /* CONFIG_CTRL_IFACE_UDP */
449
450
451 #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))452 int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
453 char *reply, size_t *reply_len,
454 void (*msg_cb)(char *msg, size_t len))
455 {
456 struct timeval tv;
457 struct os_reltime started_at;
458 int res;
459 fd_set rfds;
460 const char *_cmd;
461 char *cmd_buf = NULL;
462 size_t _cmd_len;
463
464 #ifdef CONFIG_CTRL_IFACE_UDP
465 if (ctrl->cookie) {
466 char *pos;
467 _cmd_len = os_strlen(ctrl->cookie) + 1 + cmd_len;
468 cmd_buf = os_malloc(_cmd_len);
469 if (cmd_buf == NULL)
470 return -1;
471 _cmd = cmd_buf;
472 pos = cmd_buf;
473 os_strlcpy(pos, ctrl->cookie, _cmd_len);
474 pos += os_strlen(ctrl->cookie);
475 *pos++ = ' ';
476 os_memcpy(pos, cmd, cmd_len);
477 } else
478 #endif /* CONFIG_CTRL_IFACE_UDP */
479 {
480 _cmd = cmd;
481 _cmd_len = cmd_len;
482 }
483
484 errno = 0;
485 started_at.sec = 0;
486 started_at.usec = 0;
487 retry_send:
488 if (send(ctrl->s, _cmd, _cmd_len, 0) < 0) {
489 if (errno == EAGAIN || errno == EBUSY || errno == EWOULDBLOCK)
490 {
491 /*
492 * Must be a non-blocking socket... Try for a bit
493 * longer before giving up.
494 */
495 if (started_at.sec == 0)
496 os_get_reltime(&started_at);
497 else {
498 struct os_reltime n;
499 os_get_reltime(&n);
500 /* Try for a few seconds. */
501 if (os_reltime_expired(&n, &started_at, 5))
502 goto send_err;
503 }
504 os_sleep(1, 0);
505 goto retry_send;
506 }
507 send_err:
508 os_free(cmd_buf);
509 return -1;
510 }
511 os_free(cmd_buf);
512
513 for (;;) {
514 tv.tv_sec = 10;
515 tv.tv_usec = 0;
516 FD_ZERO(&rfds);
517 FD_SET(ctrl->s, &rfds);
518 res = select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
519 if (res < 0)
520 return res;
521 if (FD_ISSET(ctrl->s, &rfds)) {
522 res = recv(ctrl->s, reply, *reply_len, 0);
523 if (res < 0)
524 return res;
525 if (res > 0 && reply[0] == '<') {
526 /* This is an unsolicited message from
527 * wpa_supplicant, not the reply to the
528 * request. Use msg_cb to report this to the
529 * caller. */
530 if (msg_cb) {
531 /* Make sure the message is nul
532 * terminated. */
533 if ((size_t) res == *reply_len)
534 res = (*reply_len) - 1;
535 reply[res] = '\0';
536 msg_cb(reply, res);
537 }
538 continue;
539 }
540 *reply_len = res;
541 break;
542 } else {
543 return -2;
544 }
545 }
546 return 0;
547 }
548 #endif /* CTRL_IFACE_SOCKET */
549
550
wpa_ctrl_attach_helper(struct wpa_ctrl * ctrl,int attach)551 static int wpa_ctrl_attach_helper(struct wpa_ctrl *ctrl, int attach)
552 {
553 char buf[10];
554 int ret;
555 size_t len = 10;
556
557 ret = wpa_ctrl_request(ctrl, attach ? "ATTACH" : "DETACH", 6,
558 buf, &len, NULL);
559 if (ret < 0)
560 return ret;
561 if (len == 3 && os_memcmp(buf, "OK\n", 3) == 0)
562 return 0;
563 return -1;
564 }
565
566
wpa_ctrl_attach(struct wpa_ctrl * ctrl)567 int wpa_ctrl_attach(struct wpa_ctrl *ctrl)
568 {
569 return wpa_ctrl_attach_helper(ctrl, 1);
570 }
571
572
wpa_ctrl_detach(struct wpa_ctrl * ctrl)573 int wpa_ctrl_detach(struct wpa_ctrl *ctrl)
574 {
575 return wpa_ctrl_attach_helper(ctrl, 0);
576 }
577
578
579 #ifdef CTRL_IFACE_SOCKET
580
wpa_ctrl_recv(struct wpa_ctrl * ctrl,char * reply,size_t * reply_len)581 int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
582 {
583 int res;
584
585 res = recv(ctrl->s, reply, *reply_len, 0);
586 if (res < 0)
587 return res;
588 *reply_len = res;
589 return 0;
590 }
591
592
wpa_ctrl_pending(struct wpa_ctrl * ctrl)593 int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
594 {
595 struct timeval tv;
596 fd_set rfds;
597 tv.tv_sec = 0;
598 tv.tv_usec = 0;
599 FD_ZERO(&rfds);
600 FD_SET(ctrl->s, &rfds);
601 select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
602 return FD_ISSET(ctrl->s, &rfds);
603 }
604
605
wpa_ctrl_get_fd(struct wpa_ctrl * ctrl)606 int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
607 {
608 return ctrl->s;
609 }
610
611 #endif /* CTRL_IFACE_SOCKET */
612
613
614 #ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
615
616 #ifndef WPA_SUPPLICANT_NAMED_PIPE
617 #define WPA_SUPPLICANT_NAMED_PIPE "WpaSupplicant"
618 #endif
619 #define NAMED_PIPE_PREFIX TEXT("\\\\.\\pipe\\") TEXT(WPA_SUPPLICANT_NAMED_PIPE)
620
wpa_ctrl_open(const char * ctrl_path)621 struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
622 {
623 struct wpa_ctrl *ctrl;
624 DWORD mode;
625 TCHAR name[256];
626 int i, ret;
627
628 ctrl = os_malloc(sizeof(*ctrl));
629 if (ctrl == NULL)
630 return NULL;
631 os_memset(ctrl, 0, sizeof(*ctrl));
632
633 #ifdef UNICODE
634 if (ctrl_path == NULL)
635 ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX);
636 else
637 ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX TEXT("-%S"),
638 ctrl_path);
639 #else /* UNICODE */
640 if (ctrl_path == NULL)
641 ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX);
642 else
643 ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX "-%s",
644 ctrl_path);
645 #endif /* UNICODE */
646 if (ret < 0 || ret >= 256) {
647 os_free(ctrl);
648 return NULL;
649 }
650
651 for (i = 0; i < 10; i++) {
652 ctrl->pipe = CreateFile(name, GENERIC_READ | GENERIC_WRITE, 0,
653 NULL, OPEN_EXISTING, 0, NULL);
654 /*
655 * Current named pipe server side in wpa_supplicant is
656 * re-opening the pipe for new clients only after the previous
657 * one is taken into use. This leaves a small window for race
658 * conditions when two connections are being opened at almost
659 * the same time. Retry if that was the case.
660 */
661 if (ctrl->pipe != INVALID_HANDLE_VALUE ||
662 GetLastError() != ERROR_PIPE_BUSY)
663 break;
664 WaitNamedPipe(name, 1000);
665 }
666 if (ctrl->pipe == INVALID_HANDLE_VALUE) {
667 os_free(ctrl);
668 return NULL;
669 }
670
671 mode = PIPE_READMODE_MESSAGE;
672 if (!SetNamedPipeHandleState(ctrl->pipe, &mode, NULL, NULL)) {
673 CloseHandle(ctrl->pipe);
674 os_free(ctrl);
675 return NULL;
676 }
677
678 return ctrl;
679 }
680
681
wpa_ctrl_close(struct wpa_ctrl * ctrl)682 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
683 {
684 CloseHandle(ctrl->pipe);
685 os_free(ctrl);
686 }
687
688
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))689 int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
690 char *reply, size_t *reply_len,
691 void (*msg_cb)(char *msg, size_t len))
692 {
693 DWORD written;
694 DWORD readlen = *reply_len;
695
696 if (!WriteFile(ctrl->pipe, cmd, cmd_len, &written, NULL))
697 return -1;
698
699 if (!ReadFile(ctrl->pipe, reply, *reply_len, &readlen, NULL))
700 return -1;
701 *reply_len = readlen;
702
703 return 0;
704 }
705
706
wpa_ctrl_recv(struct wpa_ctrl * ctrl,char * reply,size_t * reply_len)707 int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
708 {
709 DWORD len = *reply_len;
710 if (!ReadFile(ctrl->pipe, reply, *reply_len, &len, NULL))
711 return -1;
712 *reply_len = len;
713 return 0;
714 }
715
716
wpa_ctrl_pending(struct wpa_ctrl * ctrl)717 int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
718 {
719 DWORD left;
720
721 if (!PeekNamedPipe(ctrl->pipe, NULL, 0, NULL, &left, NULL))
722 return -1;
723 return left ? 1 : 0;
724 }
725
726
wpa_ctrl_get_fd(struct wpa_ctrl * ctrl)727 int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
728 {
729 return -1;
730 }
731
732 #endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
733
734 #endif /* CONFIG_CTRL_IFACE */
735