1 /*
2 * WPA Supplicant / UNIX domain socket -based control interface
3 * Copyright (c) 2004-2013, 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 #include <sys/un.h>
11 #include <sys/stat.h>
12 #include <grp.h>
13 #include <stddef.h>
14 #include <unistd.h>
15 #include <fcntl.h>
16 #ifdef ANDROID
17 #include <cutils/sockets.h>
18 #endif /* ANDROID */
19
20 #include "utils/common.h"
21 #include "utils/eloop.h"
22 #include "utils/list.h"
23 #include "eapol_supp/eapol_supp_sm.h"
24 #include "config.h"
25 #include "wpa_supplicant_i.h"
26 #include "ctrl_iface.h"
27
28 /* Per-interface ctrl_iface */
29
30 /**
31 * struct wpa_ctrl_dst - Internal data structure of control interface monitors
32 *
33 * This structure is used to store information about registered control
34 * interface monitors into struct wpa_supplicant. This data is private to
35 * ctrl_iface_unix.c and should not be touched directly from other files.
36 */
37 struct wpa_ctrl_dst {
38 struct dl_list list;
39 struct sockaddr_un addr;
40 socklen_t addrlen;
41 int debug_level;
42 int errors;
43 };
44
45
46 struct ctrl_iface_priv {
47 struct wpa_supplicant *wpa_s;
48 int sock;
49 struct dl_list ctrl_dst;
50 };
51
52
53 struct ctrl_iface_global_priv {
54 struct wpa_global *global;
55 int sock;
56 struct dl_list ctrl_dst;
57 };
58
59
60 static void wpa_supplicant_ctrl_iface_send(const char *ifname, int sock,
61 struct dl_list *ctrl_dst,
62 int level, const char *buf,
63 size_t len);
64
65
wpa_supplicant_ctrl_iface_attach(struct dl_list * ctrl_dst,struct sockaddr_un * from,socklen_t fromlen)66 static int wpa_supplicant_ctrl_iface_attach(struct dl_list *ctrl_dst,
67 struct sockaddr_un *from,
68 socklen_t fromlen)
69 {
70 struct wpa_ctrl_dst *dst;
71
72 dst = os_zalloc(sizeof(*dst));
73 if (dst == NULL)
74 return -1;
75 os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
76 dst->addrlen = fromlen;
77 dst->debug_level = MSG_INFO;
78 dl_list_add(ctrl_dst, &dst->list);
79 wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
80 (u8 *) from->sun_path,
81 fromlen - offsetof(struct sockaddr_un, sun_path));
82 return 0;
83 }
84
85
wpa_supplicant_ctrl_iface_detach(struct dl_list * ctrl_dst,struct sockaddr_un * from,socklen_t fromlen)86 static int wpa_supplicant_ctrl_iface_detach(struct dl_list *ctrl_dst,
87 struct sockaddr_un *from,
88 socklen_t fromlen)
89 {
90 struct wpa_ctrl_dst *dst;
91
92 dl_list_for_each(dst, ctrl_dst, struct wpa_ctrl_dst, list) {
93 if (fromlen == dst->addrlen &&
94 os_memcmp(from->sun_path, dst->addr.sun_path,
95 fromlen - offsetof(struct sockaddr_un, sun_path))
96 == 0) {
97 wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
98 (u8 *) from->sun_path,
99 fromlen -
100 offsetof(struct sockaddr_un, sun_path));
101 dl_list_del(&dst->list);
102 os_free(dst);
103 return 0;
104 }
105 }
106 return -1;
107 }
108
109
wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv * priv,struct sockaddr_un * from,socklen_t fromlen,char * level)110 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
111 struct sockaddr_un *from,
112 socklen_t fromlen,
113 char *level)
114 {
115 struct wpa_ctrl_dst *dst;
116
117 wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
118
119 dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
120 if (fromlen == dst->addrlen &&
121 os_memcmp(from->sun_path, dst->addr.sun_path,
122 fromlen - offsetof(struct sockaddr_un, sun_path))
123 == 0) {
124 wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
125 "level", (u8 *) from->sun_path,
126 fromlen -
127 offsetof(struct sockaddr_un, sun_path));
128 dst->debug_level = atoi(level);
129 return 0;
130 }
131 }
132
133 return -1;
134 }
135
136
wpa_supplicant_ctrl_iface_receive(int sock,void * eloop_ctx,void * sock_ctx)137 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
138 void *sock_ctx)
139 {
140 struct wpa_supplicant *wpa_s = eloop_ctx;
141 struct ctrl_iface_priv *priv = sock_ctx;
142 char buf[4096];
143 int res;
144 struct sockaddr_un from;
145 socklen_t fromlen = sizeof(from);
146 char *reply = NULL;
147 size_t reply_len = 0;
148 int new_attached = 0;
149
150 res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
151 (struct sockaddr *) &from, &fromlen);
152 if (res < 0) {
153 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
154 strerror(errno));
155 return;
156 }
157 buf[res] = '\0';
158
159 if (os_strcmp(buf, "ATTACH") == 0) {
160 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
161 fromlen))
162 reply_len = 1;
163 else {
164 new_attached = 1;
165 reply_len = 2;
166 }
167 } else if (os_strcmp(buf, "DETACH") == 0) {
168 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
169 fromlen))
170 reply_len = 1;
171 else
172 reply_len = 2;
173 } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
174 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
175 buf + 6))
176 reply_len = 1;
177 else
178 reply_len = 2;
179 } else {
180 reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
181 &reply_len);
182 }
183
184 if (reply) {
185 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
186 fromlen);
187 os_free(reply);
188 } else if (reply_len == 1) {
189 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
190 fromlen);
191 } else if (reply_len == 2) {
192 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
193 fromlen);
194 }
195
196 if (new_attached)
197 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
198 }
199
200
wpa_supplicant_ctrl_iface_path(struct wpa_supplicant * wpa_s)201 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
202 {
203 char *buf;
204 size_t len;
205 char *pbuf, *dir = NULL, *gid_str = NULL;
206 int res;
207
208 if (wpa_s->conf->ctrl_interface == NULL)
209 return NULL;
210
211 pbuf = os_strdup(wpa_s->conf->ctrl_interface);
212 if (pbuf == NULL)
213 return NULL;
214 if (os_strncmp(pbuf, "DIR=", 4) == 0) {
215 dir = pbuf + 4;
216 gid_str = os_strstr(dir, " GROUP=");
217 if (gid_str) {
218 *gid_str = '\0';
219 gid_str += 7;
220 }
221 } else
222 dir = pbuf;
223
224 len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
225 buf = os_malloc(len);
226 if (buf == NULL) {
227 os_free(pbuf);
228 return NULL;
229 }
230
231 res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
232 if (res < 0 || (size_t) res >= len) {
233 os_free(pbuf);
234 os_free(buf);
235 return NULL;
236 }
237 #ifdef __CYGWIN__
238 {
239 /* Windows/WinPcap uses interface names that are not suitable
240 * as a file name - convert invalid chars to underscores */
241 char *pos = buf;
242 while (*pos) {
243 if (*pos == '\\')
244 *pos = '_';
245 pos++;
246 }
247 }
248 #endif /* __CYGWIN__ */
249 os_free(pbuf);
250 return buf;
251 }
252
253
wpa_supplicant_ctrl_iface_msg_cb(void * ctx,int level,int global,const char * txt,size_t len)254 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level, int global,
255 const char *txt, size_t len)
256 {
257 struct wpa_supplicant *wpa_s = ctx;
258
259 if (wpa_s == NULL)
260 return;
261
262 if (global != 2 && wpa_s->global->ctrl_iface) {
263 struct ctrl_iface_global_priv *priv = wpa_s->global->ctrl_iface;
264 if (!dl_list_empty(&priv->ctrl_dst)) {
265 wpa_supplicant_ctrl_iface_send(global ? NULL :
266 wpa_s->ifname,
267 priv->sock,
268 &priv->ctrl_dst,
269 level, txt, len);
270 }
271 }
272
273 if (wpa_s->ctrl_iface == NULL)
274 return;
275 wpa_supplicant_ctrl_iface_send(NULL, wpa_s->ctrl_iface->sock,
276 &wpa_s->ctrl_iface->ctrl_dst,
277 level, txt, len);
278 }
279
280
281 struct ctrl_iface_priv *
wpa_supplicant_ctrl_iface_init(struct wpa_supplicant * wpa_s)282 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
283 {
284 struct ctrl_iface_priv *priv;
285 struct sockaddr_un addr;
286 char *fname = NULL;
287 gid_t gid = 0;
288 int gid_set = 0;
289 char *buf, *dir = NULL, *gid_str = NULL;
290 struct group *grp;
291 char *endp;
292 int flags;
293
294 priv = os_zalloc(sizeof(*priv));
295 if (priv == NULL)
296 return NULL;
297 dl_list_init(&priv->ctrl_dst);
298 priv->wpa_s = wpa_s;
299 priv->sock = -1;
300
301 if (wpa_s->conf->ctrl_interface == NULL)
302 return priv;
303
304 buf = os_strdup(wpa_s->conf->ctrl_interface);
305 if (buf == NULL)
306 goto fail;
307 #ifdef ANDROID
308 os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
309 wpa_s->conf->ctrl_interface);
310 priv->sock = android_get_control_socket(addr.sun_path);
311 if (priv->sock >= 0)
312 goto havesock;
313 #endif /* ANDROID */
314 if (os_strncmp(buf, "DIR=", 4) == 0) {
315 dir = buf + 4;
316 gid_str = os_strstr(dir, " GROUP=");
317 if (gid_str) {
318 *gid_str = '\0';
319 gid_str += 7;
320 }
321 } else {
322 dir = buf;
323 gid_str = wpa_s->conf->ctrl_interface_group;
324 }
325
326 if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
327 if (errno == EEXIST) {
328 wpa_printf(MSG_DEBUG, "Using existing control "
329 "interface directory.");
330 } else {
331 wpa_printf(MSG_ERROR, "mkdir[ctrl_interface=%s]: %s",
332 dir, strerror(errno));
333 goto fail;
334 }
335 }
336
337 #ifdef ANDROID
338 /*
339 * wpa_supplicant is started from /init.*.rc on Android and that seems
340 * to be using umask 0077 which would leave the control interface
341 * directory without group access. This breaks things since Wi-Fi
342 * framework assumes that this directory can be accessed by other
343 * applications in the wifi group. Fix this by adding group access even
344 * if umask value would prevent this.
345 */
346 if (chmod(dir, S_IRWXU | S_IRWXG) < 0) {
347 wpa_printf(MSG_ERROR, "CTRL: Could not chmod directory: %s",
348 strerror(errno));
349 /* Try to continue anyway */
350 }
351 #endif /* ANDROID */
352
353 if (gid_str) {
354 grp = getgrnam(gid_str);
355 if (grp) {
356 gid = grp->gr_gid;
357 gid_set = 1;
358 wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
359 " (from group name '%s')",
360 (int) gid, gid_str);
361 } else {
362 /* Group name not found - try to parse this as gid */
363 gid = strtol(gid_str, &endp, 10);
364 if (*gid_str == '\0' || *endp != '\0') {
365 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
366 "'%s'", gid_str);
367 goto fail;
368 }
369 gid_set = 1;
370 wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
371 (int) gid);
372 }
373 }
374
375 if (gid_set && chown(dir, -1, gid) < 0) {
376 wpa_printf(MSG_ERROR, "chown[ctrl_interface=%s,gid=%d]: %s",
377 dir, (int) gid, strerror(errno));
378 goto fail;
379 }
380
381 /* Make sure the group can enter and read the directory */
382 if (gid_set &&
383 chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
384 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
385 strerror(errno));
386 goto fail;
387 }
388
389 if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
390 sizeof(addr.sun_path)) {
391 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
392 goto fail;
393 }
394
395 priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
396 if (priv->sock < 0) {
397 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
398 goto fail;
399 }
400
401 os_memset(&addr, 0, sizeof(addr));
402 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
403 addr.sun_len = sizeof(addr);
404 #endif /* __FreeBSD__ */
405 addr.sun_family = AF_UNIX;
406 fname = wpa_supplicant_ctrl_iface_path(wpa_s);
407 if (fname == NULL)
408 goto fail;
409 os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
410 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
411 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
412 strerror(errno));
413 if (connect(priv->sock, (struct sockaddr *) &addr,
414 sizeof(addr)) < 0) {
415 wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
416 " allow connections - assuming it was left"
417 "over from forced program termination");
418 if (unlink(fname) < 0) {
419 wpa_printf(MSG_ERROR,
420 "Could not unlink existing ctrl_iface socket '%s': %s",
421 fname, strerror(errno));
422 goto fail;
423 }
424 if (bind(priv->sock, (struct sockaddr *) &addr,
425 sizeof(addr)) < 0) {
426 wpa_printf(MSG_ERROR, "supp-ctrl-iface-init: bind(PF_UNIX): %s",
427 strerror(errno));
428 goto fail;
429 }
430 wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
431 "ctrl_iface socket '%s'", fname);
432 } else {
433 wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
434 "be in use - cannot override it");
435 wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
436 "not used anymore", fname);
437 os_free(fname);
438 fname = NULL;
439 goto fail;
440 }
441 }
442
443 if (gid_set && chown(fname, -1, gid) < 0) {
444 wpa_printf(MSG_ERROR, "chown[ctrl_interface=%s,gid=%d]: %s",
445 fname, (int) gid, strerror(errno));
446 goto fail;
447 }
448
449 if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
450 wpa_printf(MSG_ERROR, "chmod[ctrl_interface=%s]: %s",
451 fname, strerror(errno));
452 goto fail;
453 }
454 os_free(fname);
455
456 #ifdef ANDROID
457 havesock:
458 #endif /* ANDROID */
459
460 /*
461 * Make socket non-blocking so that we don't hang forever if
462 * target dies unexpectedly.
463 */
464 flags = fcntl(priv->sock, F_GETFL);
465 if (flags >= 0) {
466 flags |= O_NONBLOCK;
467 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
468 wpa_printf(MSG_INFO, "fcntl(ctrl, O_NONBLOCK): %s",
469 strerror(errno));
470 /* Not fatal, continue on.*/
471 }
472 }
473
474 eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
475 wpa_s, priv);
476 wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
477
478 os_free(buf);
479 return priv;
480
481 fail:
482 if (priv->sock >= 0)
483 close(priv->sock);
484 os_free(priv);
485 if (fname) {
486 unlink(fname);
487 os_free(fname);
488 }
489 os_free(buf);
490 return NULL;
491 }
492
493
wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv * priv)494 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
495 {
496 struct wpa_ctrl_dst *dst, *prev;
497
498 if (priv->sock > -1) {
499 char *fname;
500 char *buf, *dir = NULL, *gid_str = NULL;
501 eloop_unregister_read_sock(priv->sock);
502 if (!dl_list_empty(&priv->ctrl_dst)) {
503 /*
504 * Wait before closing the control socket if
505 * there are any attached monitors in order to allow
506 * them to receive any pending messages.
507 */
508 wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
509 "monitors to receive messages");
510 os_sleep(0, 100000);
511 }
512 close(priv->sock);
513 priv->sock = -1;
514 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
515 if (fname) {
516 unlink(fname);
517 os_free(fname);
518 }
519
520 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
521 if (buf == NULL)
522 goto free_dst;
523 if (os_strncmp(buf, "DIR=", 4) == 0) {
524 dir = buf + 4;
525 gid_str = os_strstr(dir, " GROUP=");
526 if (gid_str) {
527 *gid_str = '\0';
528 gid_str += 7;
529 }
530 } else
531 dir = buf;
532
533 if (rmdir(dir) < 0) {
534 if (errno == ENOTEMPTY) {
535 wpa_printf(MSG_DEBUG, "Control interface "
536 "directory not empty - leaving it "
537 "behind");
538 } else {
539 wpa_printf(MSG_ERROR,
540 "rmdir[ctrl_interface=%s]: %s",
541 dir, strerror(errno));
542 }
543 }
544 os_free(buf);
545 }
546
547 free_dst:
548 dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
549 list)
550 os_free(dst);
551 os_free(priv);
552 }
553
554
555 /**
556 * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
557 * @ifname: Interface name for global control socket or %NULL
558 * @sock: Local socket fd
559 * @ctrl_dst: List of attached listeners
560 * @level: Priority level of the message
561 * @buf: Message data
562 * @len: Message length
563 *
564 * Send a packet to all monitor programs attached to the control interface.
565 */
wpa_supplicant_ctrl_iface_send(const char * ifname,int sock,struct dl_list * ctrl_dst,int level,const char * buf,size_t len)566 static void wpa_supplicant_ctrl_iface_send(const char *ifname, int sock,
567 struct dl_list *ctrl_dst,
568 int level, const char *buf,
569 size_t len)
570 {
571 struct wpa_ctrl_dst *dst, *next;
572 char levelstr[10];
573 int idx, res;
574 struct msghdr msg;
575 struct iovec io[5];
576
577 if (sock < 0 || dl_list_empty(ctrl_dst))
578 return;
579
580 res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
581 if (res < 0 || (size_t) res >= sizeof(levelstr))
582 return;
583 idx = 0;
584 if (ifname) {
585 io[idx].iov_base = "IFNAME=";
586 io[idx].iov_len = 7;
587 idx++;
588 io[idx].iov_base = (char *) ifname;
589 io[idx].iov_len = os_strlen(ifname);
590 idx++;
591 io[idx].iov_base = " ";
592 io[idx].iov_len = 1;
593 idx++;
594 }
595 io[idx].iov_base = levelstr;
596 io[idx].iov_len = os_strlen(levelstr);
597 idx++;
598 io[idx].iov_base = (char *) buf;
599 io[idx].iov_len = len;
600 idx++;
601 os_memset(&msg, 0, sizeof(msg));
602 msg.msg_iov = io;
603 msg.msg_iovlen = idx;
604
605 idx = 0;
606 dl_list_for_each_safe(dst, next, ctrl_dst, struct wpa_ctrl_dst, list) {
607 if (level >= dst->debug_level) {
608 wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
609 (u8 *) dst->addr.sun_path, dst->addrlen -
610 offsetof(struct sockaddr_un, sun_path));
611 msg.msg_name = (void *) &dst->addr;
612 msg.msg_namelen = dst->addrlen;
613 if (sendmsg(sock, &msg, MSG_DONTWAIT) < 0) {
614 int _errno = errno;
615 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
616 "%d - %s",
617 idx, errno, strerror(errno));
618 dst->errors++;
619 if (dst->errors > 1000 ||
620 (_errno != ENOBUFS && dst->errors > 10) ||
621 _errno == ENOENT) {
622 wpa_supplicant_ctrl_iface_detach(
623 ctrl_dst, &dst->addr,
624 dst->addrlen);
625 }
626 } else
627 dst->errors = 0;
628 }
629 idx++;
630 }
631 }
632
633
wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv * priv)634 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
635 {
636 char buf[256];
637 int res;
638 struct sockaddr_un from;
639 socklen_t fromlen = sizeof(from);
640
641 for (;;) {
642 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
643 "attach", priv->wpa_s->ifname);
644 eloop_wait_for_read_sock(priv->sock);
645
646 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
647 (struct sockaddr *) &from, &fromlen);
648 if (res < 0) {
649 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
650 strerror(errno));
651 continue;
652 }
653 buf[res] = '\0';
654
655 if (os_strcmp(buf, "ATTACH") == 0) {
656 /* handle ATTACH signal of first monitor interface */
657 if (!wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst,
658 &from, fromlen)) {
659 sendto(priv->sock, "OK\n", 3, 0,
660 (struct sockaddr *) &from, fromlen);
661 /* OK to continue */
662 return;
663 } else {
664 sendto(priv->sock, "FAIL\n", 5, 0,
665 (struct sockaddr *) &from, fromlen);
666 }
667 } else {
668 /* return FAIL for all other signals */
669 sendto(priv->sock, "FAIL\n", 5, 0,
670 (struct sockaddr *) &from, fromlen);
671 }
672 }
673 }
674
675
676 /* Global ctrl_iface */
677
wpa_supplicant_global_ctrl_iface_receive(int sock,void * eloop_ctx,void * sock_ctx)678 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
679 void *sock_ctx)
680 {
681 struct wpa_global *global = eloop_ctx;
682 struct ctrl_iface_global_priv *priv = sock_ctx;
683 char buf[256];
684 int res;
685 struct sockaddr_un from;
686 socklen_t fromlen = sizeof(from);
687 char *reply = NULL;
688 size_t reply_len;
689
690 res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
691 (struct sockaddr *) &from, &fromlen);
692 if (res < 0) {
693 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
694 strerror(errno));
695 return;
696 }
697 buf[res] = '\0';
698
699 if (os_strcmp(buf, "ATTACH") == 0) {
700 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
701 fromlen))
702 reply_len = 1;
703 else
704 reply_len = 2;
705 } else if (os_strcmp(buf, "DETACH") == 0) {
706 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
707 fromlen))
708 reply_len = 1;
709 else
710 reply_len = 2;
711 } else {
712 reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
713 &reply_len);
714 }
715
716 if (reply) {
717 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
718 fromlen);
719 os_free(reply);
720 } else if (reply_len == 1) {
721 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
722 fromlen);
723 } else if (reply_len == 2) {
724 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from, fromlen);
725 }
726 }
727
728
729 struct ctrl_iface_global_priv *
wpa_supplicant_global_ctrl_iface_init(struct wpa_global * global)730 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
731 {
732 struct ctrl_iface_global_priv *priv;
733 struct sockaddr_un addr;
734 const char *ctrl = global->params.ctrl_interface;
735 int flags;
736
737 priv = os_zalloc(sizeof(*priv));
738 if (priv == NULL)
739 return NULL;
740 dl_list_init(&priv->ctrl_dst);
741 priv->global = global;
742 priv->sock = -1;
743
744 if (ctrl == NULL)
745 return priv;
746
747 wpa_printf(MSG_DEBUG, "Global control interface '%s'", ctrl);
748
749 #ifdef ANDROID
750 if (os_strncmp(ctrl, "@android:", 9) == 0) {
751 priv->sock = android_get_control_socket(ctrl + 9);
752 if (priv->sock < 0) {
753 wpa_printf(MSG_ERROR, "Failed to open Android control "
754 "socket '%s'", ctrl + 9);
755 goto fail;
756 }
757 wpa_printf(MSG_DEBUG, "Using Android control socket '%s'",
758 ctrl + 9);
759 goto havesock;
760 }
761
762 if (os_strncmp(ctrl, "@abstract:", 10) != 0) {
763 /*
764 * Backwards compatibility - try to open an Android control
765 * socket and if that fails, assume this was a UNIX domain
766 * socket instead.
767 */
768 priv->sock = android_get_control_socket(ctrl);
769 if (priv->sock >= 0) {
770 wpa_printf(MSG_DEBUG,
771 "Using Android control socket '%s'",
772 ctrl);
773 goto havesock;
774 }
775 }
776 #endif /* ANDROID */
777
778 priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
779 if (priv->sock < 0) {
780 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
781 goto fail;
782 }
783
784 os_memset(&addr, 0, sizeof(addr));
785 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
786 addr.sun_len = sizeof(addr);
787 #endif /* __FreeBSD__ */
788 addr.sun_family = AF_UNIX;
789
790 if (os_strncmp(ctrl, "@abstract:", 10) == 0) {
791 addr.sun_path[0] = '\0';
792 os_strlcpy(addr.sun_path + 1, ctrl + 10,
793 sizeof(addr.sun_path) - 1);
794 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) <
795 0) {
796 wpa_printf(MSG_ERROR, "supp-global-ctrl-iface-init: "
797 "bind(PF_UNIX;%s) failed: %s",
798 ctrl, strerror(errno));
799 goto fail;
800 }
801 wpa_printf(MSG_DEBUG, "Using Abstract control socket '%s'",
802 ctrl + 10);
803 goto havesock;
804 }
805
806 os_strlcpy(addr.sun_path, ctrl, sizeof(addr.sun_path));
807 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
808 wpa_printf(MSG_INFO, "supp-global-ctrl-iface-init(%s) (will try fixup): bind(PF_UNIX): %s",
809 ctrl, strerror(errno));
810 if (connect(priv->sock, (struct sockaddr *) &addr,
811 sizeof(addr)) < 0) {
812 wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
813 " allow connections - assuming it was left"
814 "over from forced program termination");
815 if (unlink(ctrl) < 0) {
816 wpa_printf(MSG_ERROR,
817 "Could not unlink existing ctrl_iface socket '%s': %s",
818 ctrl, strerror(errno));
819 goto fail;
820 }
821 if (bind(priv->sock, (struct sockaddr *) &addr,
822 sizeof(addr)) < 0) {
823 wpa_printf(MSG_ERROR, "supp-glb-iface-init: bind(PF_UNIX;%s): %s",
824 ctrl, strerror(errno));
825 goto fail;
826 }
827 wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
828 "ctrl_iface socket '%s'",
829 ctrl);
830 } else {
831 wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
832 "be in use - cannot override it");
833 wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
834 "not used anymore",
835 ctrl);
836 goto fail;
837 }
838 }
839
840 wpa_printf(MSG_DEBUG, "Using UNIX control socket '%s'", ctrl);
841
842 if (global->params.ctrl_interface_group) {
843 char *gid_str = global->params.ctrl_interface_group;
844 gid_t gid = 0;
845 struct group *grp;
846 char *endp;
847
848 grp = getgrnam(gid_str);
849 if (grp) {
850 gid = grp->gr_gid;
851 wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
852 " (from group name '%s')",
853 (int) gid, gid_str);
854 } else {
855 /* Group name not found - try to parse this as gid */
856 gid = strtol(gid_str, &endp, 10);
857 if (*gid_str == '\0' || *endp != '\0') {
858 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
859 "'%s'", gid_str);
860 goto fail;
861 }
862 wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
863 (int) gid);
864 }
865 if (chown(ctrl, -1, gid) < 0) {
866 wpa_printf(MSG_ERROR,
867 "chown[global_ctrl_interface=%s,gid=%d]: %s",
868 ctrl, (int) gid, strerror(errno));
869 goto fail;
870 }
871
872 if (chmod(ctrl, S_IRWXU | S_IRWXG) < 0) {
873 wpa_printf(MSG_ERROR,
874 "chmod[global_ctrl_interface=%s]: %s",
875 ctrl, strerror(errno));
876 goto fail;
877 }
878 } else {
879 chmod(ctrl, S_IRWXU);
880 }
881
882 havesock:
883
884 /*
885 * Make socket non-blocking so that we don't hang forever if
886 * target dies unexpectedly.
887 */
888 flags = fcntl(priv->sock, F_GETFL);
889 if (flags >= 0) {
890 flags |= O_NONBLOCK;
891 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
892 wpa_printf(MSG_INFO, "fcntl(ctrl, O_NONBLOCK): %s",
893 strerror(errno));
894 /* Not fatal, continue on.*/
895 }
896 }
897
898 eloop_register_read_sock(priv->sock,
899 wpa_supplicant_global_ctrl_iface_receive,
900 global, priv);
901
902 return priv;
903
904 fail:
905 if (priv->sock >= 0)
906 close(priv->sock);
907 os_free(priv);
908 return NULL;
909 }
910
911
912 void
wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv * priv)913 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
914 {
915 struct wpa_ctrl_dst *dst, *prev;
916
917 if (priv->sock >= 0) {
918 eloop_unregister_read_sock(priv->sock);
919 close(priv->sock);
920 }
921 if (priv->global->params.ctrl_interface)
922 unlink(priv->global->params.ctrl_interface);
923 dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
924 list)
925 os_free(dst);
926 os_free(priv);
927 }
928