1 /*
2 * WPA Supplicant / UDP socket -based control interface
3 * Copyright (c) 2004-2005, 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 #include "common.h"
12 #include "eloop.h"
13 #include "config.h"
14 #include "eapol_supp/eapol_supp_sm.h"
15 #include "wpa_supplicant_i.h"
16 #include "ctrl_iface.h"
17 #include "common/wpa_ctrl.h"
18
19
20 #define COOKIE_LEN 8
21
22 /* Per-interface ctrl_iface */
23
24 /**
25 * struct wpa_ctrl_dst - Internal data structure of control interface monitors
26 *
27 * This structure is used to store information about registered control
28 * interface monitors into struct wpa_supplicant. This data is private to
29 * ctrl_iface_udp.c and should not be touched directly from other files.
30 */
31 struct wpa_ctrl_dst {
32 struct wpa_ctrl_dst *next;
33 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
34 struct sockaddr_in6 addr;
35 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
36 struct sockaddr_in addr;
37 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
38 socklen_t addrlen;
39 int debug_level;
40 int errors;
41 };
42
43
44 struct ctrl_iface_priv {
45 struct wpa_supplicant *wpa_s;
46 int sock;
47 struct wpa_ctrl_dst *ctrl_dst;
48 u8 cookie[COOKIE_LEN];
49 };
50
51
52 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
53 int level, const char *buf,
54 size_t len);
55
56
wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv * priv,struct sockaddr_in6 * from,socklen_t fromlen)57 static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
58 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
59 struct sockaddr_in6 *from,
60 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
61 struct sockaddr_in *from,
62 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
63 socklen_t fromlen)
64 {
65 struct wpa_ctrl_dst *dst;
66 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
67 char addr[INET6_ADDRSTRLEN];
68 #endif /* CONFIG_UDP_IPV6 */
69
70 dst = os_zalloc(sizeof(*dst));
71 if (dst == NULL)
72 return -1;
73 os_memcpy(&dst->addr, from, sizeof(*from));
74 dst->addrlen = fromlen;
75 dst->debug_level = MSG_INFO;
76 dst->next = priv->ctrl_dst;
77 priv->ctrl_dst = dst;
78 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
79 wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
80 inet_ntop(AF_INET6, &from->sin6_addr, addr, sizeof(*from)),
81 ntohs(from->sin6_port));
82 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
83 wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
84 inet_ntoa(from->sin_addr), ntohs(from->sin_port));
85 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
86 return 0;
87 }
88
89
wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv * priv,struct sockaddr_in6 * from,socklen_t fromlen)90 static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
91 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
92 struct sockaddr_in6 *from,
93 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
94 struct sockaddr_in *from,
95 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
96 socklen_t fromlen)
97 {
98 struct wpa_ctrl_dst *dst, *prev = NULL;
99 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
100 char addr[INET6_ADDRSTRLEN];
101 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
102
103 dst = priv->ctrl_dst;
104 while (dst) {
105 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
106 if (from->sin6_port == dst->addr.sin6_port &&
107 !os_memcmp(&from->sin6_addr, &dst->addr.sin6_addr,
108 sizeof(from->sin6_addr))) {
109 wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached %s:%d",
110 inet_ntop(AF_INET6, &from->sin6_addr, addr,
111 sizeof(*from)),
112 ntohs(from->sin6_port));
113 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
114 if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
115 from->sin_port == dst->addr.sin_port) {
116 wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached "
117 "%s:%d", inet_ntoa(from->sin_addr),
118 ntohs(from->sin_port));
119 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
120 if (prev == NULL)
121 priv->ctrl_dst = dst->next;
122 else
123 prev->next = dst->next;
124 os_free(dst);
125 return 0;
126 }
127 prev = dst;
128 dst = dst->next;
129 }
130 return -1;
131 }
132
133
134 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
135 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
136 struct sockaddr_in6 *from,
137 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
138 struct sockaddr_in *from,
139 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
140 socklen_t fromlen,
141 char *level)
142 {
143 struct wpa_ctrl_dst *dst;
144 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
145 char addr[INET6_ADDRSTRLEN];
146 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
147
148 wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
149
150 dst = priv->ctrl_dst;
151 while (dst) {
152 #if CONFIG_CTRL_IFACE_UDP_IPV6
153 if (from->sin6_port == dst->addr.sin6_port &&
154 !os_memcmp(&from->sin6_addr, &dst->addr.sin6_addr,
155 sizeof(from->sin6_addr))) {
156 wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor level %s:%d",
157 inet_ntop(AF_INET6, &from->sin6_addr, addr,
158 sizeof(*from)),
159 ntohs(from->sin6_port));
160 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
161 if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
162 from->sin_port == dst->addr.sin_port) {
163 wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor "
164 "level %s:%d", inet_ntoa(from->sin_addr),
165 ntohs(from->sin_port));
166 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
167 dst->debug_level = atoi(level);
168 return 0;
169 }
170 dst = dst->next;
171 }
172
173 return -1;
174 }
175
176
177 static char *
178 wpa_supplicant_ctrl_iface_get_cookie(struct ctrl_iface_priv *priv,
179 size_t *reply_len)
180 {
181 char *reply;
182 reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
183 if (reply == NULL) {
184 *reply_len = 1;
185 return NULL;
186 }
187
188 os_memcpy(reply, "COOKIE=", 7);
189 wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
190 priv->cookie, COOKIE_LEN);
191
192 *reply_len = 7 + 2 * COOKIE_LEN;
193 return reply;
194 }
195
196
197 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
198 void *sock_ctx)
199 {
200 struct wpa_supplicant *wpa_s = eloop_ctx;
201 struct ctrl_iface_priv *priv = sock_ctx;
202 char buf[256], *pos;
203 int res;
204 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
205 struct sockaddr_in6 from;
206 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
207 char addr[INET6_ADDRSTRLEN];
208 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
209 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
210 struct sockaddr_in from;
211 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
212 socklen_t fromlen = sizeof(from);
213 char *reply = NULL;
214 size_t reply_len = 0;
215 int new_attached = 0;
216 u8 cookie[COOKIE_LEN];
217
218 res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
219 (struct sockaddr *) &from, &fromlen);
220 if (res < 0) {
221 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
222 strerror(errno));
223 return;
224 }
225
226 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
227 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
228 inet_ntop(AF_INET6, &from.sin6_addr, addr, sizeof(from));
229 if (os_strcmp(addr, "::1")) {
230 wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected source %s",
231 addr);
232 }
233 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
234 if (from.sin_addr.s_addr != htonl((127 << 24) | 1)) {
235 /*
236 * The OS networking stack is expected to drop this kind of
237 * frames since the socket is bound to only localhost address.
238 * Just in case, drop the frame if it is coming from any other
239 * address.
240 */
241 wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
242 "source %s", inet_ntoa(from.sin_addr));
243 return;
244 }
245 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
246 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
247
248 buf[res] = '\0';
249
250 if (os_strcmp(buf, "GET_COOKIE") == 0) {
251 reply = wpa_supplicant_ctrl_iface_get_cookie(priv, &reply_len);
252 goto done;
253 }
254
255 /*
256 * Require that the client includes a prefix with the 'cookie' value
257 * fetched with GET_COOKIE command. This is used to verify that the
258 * client has access to a bidirectional link over UDP in order to
259 * avoid attacks using forged localhost IP address even if the OS does
260 * not block such frames from remote destinations.
261 */
262 if (os_strncmp(buf, "COOKIE=", 7) != 0) {
263 wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
264 "drop request");
265 return;
266 }
267
268 if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
269 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
270 "request - drop request");
271 return;
272 }
273
274 if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
275 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
276 "drop request");
277 return;
278 }
279
280 pos = buf + 7 + 2 * COOKIE_LEN;
281 while (*pos == ' ')
282 pos++;
283
284 if (os_strcmp(pos, "ATTACH") == 0) {
285 if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
286 reply_len = 1;
287 else {
288 new_attached = 1;
289 reply_len = 2;
290 }
291 } else if (os_strcmp(pos, "DETACH") == 0) {
292 if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
293 reply_len = 1;
294 else
295 reply_len = 2;
296 } else if (os_strncmp(pos, "LEVEL ", 6) == 0) {
297 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
298 pos + 6))
299 reply_len = 1;
300 else
301 reply_len = 2;
302 } else {
303 reply = wpa_supplicant_ctrl_iface_process(wpa_s, pos,
304 &reply_len);
305 }
306
307 done:
308 if (reply) {
309 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
310 fromlen);
311 os_free(reply);
312 } else if (reply_len == 1) {
313 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
314 fromlen);
315 } else if (reply_len == 2) {
316 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
317 fromlen);
318 }
319
320 if (new_attached)
321 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
322 }
323
324
325 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
326 enum wpa_msg_type type,
327 const char *txt, size_t len)
328 {
329 struct wpa_supplicant *wpa_s = ctx;
330 if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
331 return;
332 wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
333 }
334
335
336 struct ctrl_iface_priv *
337 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
338 {
339 struct ctrl_iface_priv *priv;
340 int port = WPA_CTRL_IFACE_PORT;
341 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
342 struct sockaddr_in6 addr;
343 int domain = PF_INET6;
344 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
345 struct sockaddr_in addr;
346 int domain = PF_INET;
347 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
348
349 priv = os_zalloc(sizeof(*priv));
350 if (priv == NULL)
351 return NULL;
352 priv->wpa_s = wpa_s;
353 priv->sock = -1;
354 os_get_random(priv->cookie, COOKIE_LEN);
355
356 if (wpa_s->conf->ctrl_interface == NULL)
357 return priv;
358
359 priv->sock = socket(domain, SOCK_DGRAM, 0);
360 if (priv->sock < 0) {
361 wpa_printf(MSG_ERROR, "socket(PF_INET): %s", strerror(errno));
362 goto fail;
363 }
364
365 os_memset(&addr, 0, sizeof(addr));
366 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
367 addr.sin6_family = AF_INET6;
368 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
369 addr.sin6_addr = in6addr_any;
370 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
371 inet_pton(AF_INET6, "::1", &addr.sin6_addr);
372 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
373 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
374 addr.sin_family = AF_INET;
375 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
376 addr.sin_addr.s_addr = INADDR_ANY;
377 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
378 addr.sin_addr.s_addr = htonl((127 << 24) | 1);
379 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
380 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
381 try_again:
382 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
383 addr.sin6_port = htons(port);
384 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
385 addr.sin_port = htons(port);
386 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
387 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
388 port--;
389 if ((WPA_CTRL_IFACE_PORT - port) < WPA_CTRL_IFACE_PORT_LIMIT)
390 goto try_again;
391 wpa_printf(MSG_ERROR, "bind(AF_INET): %s", strerror(errno));
392 goto fail;
393 }
394
395 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
396 wpa_msg(wpa_s, MSG_DEBUG, "ctrl_iface_init UDP port: %d", port);
397 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
398
399 eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
400 wpa_s, priv);
401 wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
402
403 return priv;
404
405 fail:
406 if (priv->sock >= 0)
407 close(priv->sock);
408 os_free(priv);
409 return NULL;
410 }
411
412
413 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
414 {
415 struct wpa_ctrl_dst *dst, *prev;
416
417 if (priv->sock > -1) {
418 eloop_unregister_read_sock(priv->sock);
419 if (priv->ctrl_dst) {
420 /*
421 * Wait before closing the control socket if
422 * there are any attached monitors in order to allow
423 * them to receive any pending messages.
424 */
425 wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
426 "monitors to receive messages");
427 os_sleep(0, 100000);
428 }
429 close(priv->sock);
430 priv->sock = -1;
431 }
432
433 dst = priv->ctrl_dst;
434 while (dst) {
435 prev = dst;
436 dst = dst->next;
437 os_free(prev);
438 }
439 os_free(priv);
440 }
441
442
443 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
444 int level, const char *buf,
445 size_t len)
446 {
447 struct wpa_ctrl_dst *dst, *next;
448 char levelstr[10];
449 int idx;
450 char *sbuf;
451 int llen;
452 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
453 char addr[INET6_ADDRSTRLEN];
454 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
455
456 dst = priv->ctrl_dst;
457 if (priv->sock < 0 || dst == NULL)
458 return;
459
460 os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
461
462 llen = os_strlen(levelstr);
463 sbuf = os_malloc(llen + len);
464 if (sbuf == NULL)
465 return;
466
467 os_memcpy(sbuf, levelstr, llen);
468 os_memcpy(sbuf + llen, buf, len);
469
470 idx = 0;
471 while (dst) {
472 next = dst->next;
473 if (level >= dst->debug_level) {
474 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
475 wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
476 inet_ntop(AF_INET6, &dst->addr.sin6_addr,
477 addr, sizeof(dst->addr)),
478 ntohs(dst->addr.sin6_port));
479 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
480 wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
481 inet_ntoa(dst->addr.sin_addr),
482 ntohs(dst->addr.sin_port));
483 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
484 if (sendto(priv->sock, sbuf, llen + len, 0,
485 (struct sockaddr *) &dst->addr,
486 sizeof(dst->addr)) < 0) {
487 wpa_printf(MSG_ERROR,
488 "sendto(CTRL_IFACE monitor): %s",
489 strerror(errno));
490 dst->errors++;
491 if (dst->errors > 10) {
492 wpa_supplicant_ctrl_iface_detach(
493 priv, &dst->addr,
494 dst->addrlen);
495 }
496 } else
497 dst->errors = 0;
498 }
499 idx++;
500 dst = next;
501 }
502 os_free(sbuf);
503 }
504
505
506 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
507 {
508 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor",
509 priv->wpa_s->ifname);
510 eloop_wait_for_read_sock(priv->sock);
511 }
512
513
514 /* Global ctrl_iface */
515
516 struct ctrl_iface_global_priv {
517 int sock;
518 u8 cookie[COOKIE_LEN];
519 };
520
521
522 static char *
523 wpa_supplicant_global_get_cookie(struct ctrl_iface_global_priv *priv,
524 size_t *reply_len)
525 {
526 char *reply;
527 reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
528 if (reply == NULL) {
529 *reply_len = 1;
530 return NULL;
531 }
532
533 os_memcpy(reply, "COOKIE=", 7);
534 wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
535 priv->cookie, COOKIE_LEN);
536
537 *reply_len = 7 + 2 * COOKIE_LEN;
538 return reply;
539 }
540
541
542 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
543 void *sock_ctx)
544 {
545 struct wpa_global *global = eloop_ctx;
546 struct ctrl_iface_global_priv *priv = sock_ctx;
547 char buf[256], *pos;
548 int res;
549 struct sockaddr_in from;
550 socklen_t fromlen = sizeof(from);
551 char *reply;
552 size_t reply_len;
553 u8 cookie[COOKIE_LEN];
554
555 res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
556 (struct sockaddr *) &from, &fromlen);
557 if (res < 0) {
558 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
559 strerror(errno));
560 return;
561 }
562
563 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
564 if (from.sin_addr.s_addr != htonl((127 << 24) | 1)) {
565 /*
566 * The OS networking stack is expected to drop this kind of
567 * frames since the socket is bound to only localhost address.
568 * Just in case, drop the frame if it is coming from any other
569 * address.
570 */
571 wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
572 "source %s", inet_ntoa(from.sin_addr));
573 return;
574 }
575 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
576
577 buf[res] = '\0';
578
579 if (os_strcmp(buf, "GET_COOKIE") == 0) {
580 reply = wpa_supplicant_global_get_cookie(priv, &reply_len);
581 goto done;
582 }
583
584 if (os_strncmp(buf, "COOKIE=", 7) != 0) {
585 wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
586 "drop request");
587 return;
588 }
589
590 if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
591 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
592 "request - drop request");
593 return;
594 }
595
596 if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
597 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
598 "drop request");
599 return;
600 }
601
602 pos = buf + 7 + 2 * COOKIE_LEN;
603 while (*pos == ' ')
604 pos++;
605
606 reply = wpa_supplicant_global_ctrl_iface_process(global, pos,
607 &reply_len);
608
609 done:
610 if (reply) {
611 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
612 fromlen);
613 os_free(reply);
614 } else if (reply_len) {
615 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
616 fromlen);
617 }
618 }
619
620
621 struct ctrl_iface_global_priv *
622 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
623 {
624 struct ctrl_iface_global_priv *priv;
625 struct sockaddr_in addr;
626 int port = WPA_GLOBAL_CTRL_IFACE_PORT;
627
628 priv = os_zalloc(sizeof(*priv));
629 if (priv == NULL)
630 return NULL;
631 priv->sock = -1;
632 os_get_random(priv->cookie, COOKIE_LEN);
633
634 if (global->params.ctrl_interface == NULL)
635 return priv;
636
637 wpa_printf(MSG_DEBUG, "Global control interface '%s'",
638 global->params.ctrl_interface);
639
640 priv->sock = socket(PF_INET, SOCK_DGRAM, 0);
641 if (priv->sock < 0) {
642 wpa_printf(MSG_ERROR, "socket(PF_INET): %s", strerror(errno));
643 goto fail;
644 }
645
646 os_memset(&addr, 0, sizeof(addr));
647 addr.sin_family = AF_INET;
648 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
649 addr.sin_addr.s_addr = INADDR_ANY;
650 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
651 addr.sin_addr.s_addr = htonl((127 << 24) | 1);
652 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
653 try_again:
654 addr.sin_port = htons(port);
655 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
656 port++;
657 if ((port - WPA_GLOBAL_CTRL_IFACE_PORT) <
658 WPA_GLOBAL_CTRL_IFACE_PORT_LIMIT)
659 goto try_again;
660 wpa_printf(MSG_ERROR, "bind(AF_INET): %s", strerror(errno));
661 goto fail;
662 }
663
664 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
665 wpa_printf(MSG_DEBUG, "global_ctrl_iface_init UDP port: %d", port);
666 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
667
668 eloop_register_read_sock(priv->sock,
669 wpa_supplicant_global_ctrl_iface_receive,
670 global, priv);
671
672 return priv;
673
674 fail:
675 if (priv->sock >= 0)
676 close(priv->sock);
677 os_free(priv);
678 return NULL;
679 }
680
681
682 void
683 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
684 {
685 if (priv->sock >= 0) {
686 eloop_unregister_read_sock(priv->sock);
687 close(priv->sock);
688 }
689 os_free(priv);
690 }
691