Line data Source code
1 : /*
2 : * UPnP WPS Device
3 : * Copyright (c) 2000-2003 Intel Corporation
4 : * Copyright (c) 2006-2007 Sony Corporation
5 : * Copyright (c) 2008-2009 Atheros Communications
6 : * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
7 : *
8 : * See below for more details on licensing and code history.
9 : */
10 :
11 : /*
12 : * This has been greatly stripped down from the original file
13 : * (upnp_wps_device.c) by Ted Merrill, Atheros Communications
14 : * in order to eliminate use of the bulky libupnp library etc.
15 : *
16 : * History:
17 : * upnp_wps_device.c is/was a shim layer between wps_opt_upnp.c and
18 : * the libupnp library.
19 : * The layering (by Sony) was well done; only a very minor modification
20 : * to API of upnp_wps_device.c was required.
21 : * libupnp was found to be undesirable because:
22 : * -- It consumed too much code and data space
23 : * -- It uses multiple threads, making debugging more difficult
24 : * and possibly reducing reliability.
25 : * -- It uses static variables and only supports one instance.
26 : * The shim and libupnp are here replaced by special code written
27 : * specifically for the needs of hostapd.
28 : * Various shortcuts can and are taken to keep the code size small.
29 : * Generally, execution time is not as crucial.
30 : *
31 : * BUGS:
32 : * -- UPnP requires that we be able to resolve domain names.
33 : * While uncommon, if we have to do it then it will stall the entire
34 : * hostapd program, which is bad.
35 : * This is because we use the standard linux getaddrinfo() function
36 : * which is syncronous.
37 : * An asyncronous solution would be to use the free "ares" library.
38 : * -- Does not have a robust output buffering scheme. Uses a single
39 : * fixed size output buffer per TCP/HTTP connection, with possible (although
40 : * unlikely) possibility of overflow and likely excessive use of RAM.
41 : * A better solution would be to write the HTTP output as a buffered stream,
42 : * using chunking: (handle header specially, then) generate data with
43 : * a printf-like function into a buffer, catching buffer full condition,
44 : * then send it out surrounded by http chunking.
45 : * -- There is some code that could be separated out into the common
46 : * library to be shared with wpa_supplicant.
47 : * -- Needs renaming with module prefix to avoid polluting the debugger
48 : * namespace and causing possible collisions with other static fncs
49 : * and structure declarations when using the debugger.
50 : * -- The http error code generation is pretty bogus, hopefully no one cares.
51 : *
52 : * Author: Ted Merrill, Atheros Communications, based upon earlier work
53 : * as explained above and below.
54 : *
55 : * Copyright:
56 : * Copyright 2008 Atheros Communications.
57 : *
58 : * The original header (of upnp_wps_device.c) reads:
59 : *
60 : * Copyright (c) 2006-2007 Sony Corporation. All Rights Reserved.
61 : *
62 : * File Name: upnp_wps_device.c
63 : * Description: EAP-WPS UPnP device source
64 : *
65 : * Redistribution and use in source and binary forms, with or without
66 : * modification, are permitted provided that the following conditions
67 : * are met:
68 : *
69 : * * Redistributions of source code must retain the above copyright
70 : * notice, this list of conditions and the following disclaimer.
71 : * * Redistributions in binary form must reproduce the above copyright
72 : * notice, this list of conditions and the following disclaimer in
73 : * the documentation and/or other materials provided with the
74 : * distribution.
75 : * * Neither the name of Sony Corporation nor the names of its
76 : * contributors may be used to endorse or promote products derived
77 : * from this software without specific prior written permission.
78 : *
79 : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
80 : * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
81 : * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
82 : * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
83 : * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
84 : * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
85 : * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
86 : * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
87 : * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
88 : * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
89 : * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
90 : *
91 : * Portions from Intel libupnp files, e.g. genlib/net/http/httpreadwrite.c
92 : * typical header:
93 : *
94 : * Copyright (c) 2000-2003 Intel Corporation
95 : * All rights reserved.
96 : *
97 : * Redistribution and use in source and binary forms, with or without
98 : * modification, are permitted provided that the following conditions are met:
99 : *
100 : * * Redistributions of source code must retain the above copyright notice,
101 : * this list of conditions and the following disclaimer.
102 : * * Redistributions in binary form must reproduce the above copyright notice,
103 : * this list of conditions and the following disclaimer in the documentation
104 : * and/or other materials provided with the distribution.
105 : * * Neither name of Intel Corporation nor the names of its contributors
106 : * may be used to endorse or promote products derived from this software
107 : * without specific prior written permission.
108 : *
109 : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
110 : * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
111 : * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
112 : * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR
113 : * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
114 : * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
115 : * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
116 : * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
117 : * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
118 : * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
119 : * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
120 : */
121 :
122 : /*
123 : * Overview of WPS over UPnP:
124 : *
125 : * UPnP is a protocol that allows devices to discover each other and control
126 : * each other. In UPnP terminology, a device is either a "device" (a server
127 : * that provides information about itself and allows itself to be controlled)
128 : * or a "control point" (a client that controls "devices") or possibly both.
129 : * This file implements a UPnP "device".
130 : *
131 : * For us, we use mostly basic UPnP discovery, but the control part of interest
132 : * is WPS carried via UPnP messages. There is quite a bit of basic UPnP
133 : * discovery to do before we can get to WPS, however.
134 : *
135 : * UPnP discovery begins with "devices" send out multicast UDP packets to a
136 : * certain fixed multicast IP address and port, and "control points" sending
137 : * out other such UDP packets.
138 : *
139 : * The packets sent by devices are NOTIFY packets (not to be confused with TCP
140 : * NOTIFY packets that are used later) and those sent by control points are
141 : * M-SEARCH packets. These packets contain a simple HTTP style header. The
142 : * packets are sent redundantly to get around packet loss. Devices respond to
143 : * M-SEARCH packets with HTTP-like UDP packets containing HTTP/1.1 200 OK
144 : * messages, which give similar information as the UDP NOTIFY packets.
145 : *
146 : * The above UDP packets advertise the (arbitrary) TCP ports that the
147 : * respective parties will listen to. The control point can then do a HTTP
148 : * SUBSCRIBE (something like an HTTP PUT) after which the device can do a
149 : * separate HTTP NOTIFY (also like an HTTP PUT) to do event messaging.
150 : *
151 : * The control point will also do HTTP GET of the "device file" listed in the
152 : * original UDP information from the device (see UPNP_WPS_DEVICE_XML_FILE
153 : * data), and based on this will do additional GETs... HTTP POSTs are done to
154 : * cause an action.
155 : *
156 : * Beyond some basic information in HTTP headers, additional information is in
157 : * the HTTP bodies, in a format set by the SOAP and XML standards, a markup
158 : * language related to HTML used for web pages. This language is intended to
159 : * provide the ultimate in self-documentation by providing a universal
160 : * namespace based on pseudo-URLs called URIs. Note that although a URI looks
161 : * like a URL (a web address), they are never accessed as such but are used
162 : * only as identifiers.
163 : *
164 : * The POST of a GetDeviceInfo gets information similar to what might be
165 : * obtained from a probe request or response on Wi-Fi. WPS messages M1-M8
166 : * are passed via a POST of a PutMessage; the M1-M8 WPS messages are converted
167 : * to a bin64 ascii representation for encapsulation. When proxying messages,
168 : * WLANEvent and PutWLANResponse are used.
169 : *
170 : * This of course glosses over a lot of details.
171 : */
172 :
173 : #include "includes.h"
174 :
175 : #include <time.h>
176 : #include <net/if.h>
177 : #include <netdb.h>
178 : #include <sys/ioctl.h>
179 :
180 : #include "common.h"
181 : #include "uuid.h"
182 : #include "base64.h"
183 : #include "wps.h"
184 : #include "wps_i.h"
185 : #include "wps_upnp.h"
186 : #include "wps_upnp_i.h"
187 :
188 :
189 : /*
190 : * UPnP allows a client ("control point") to send a server like us ("device")
191 : * a domain name for registration, and we are supposed to resolve it. This is
192 : * bad because, using the standard Linux library, we will stall the entire
193 : * hostapd waiting for resolution.
194 : *
195 : * The "correct" solution would be to use an event driven library for domain
196 : * name resolution such as "ares". However, this would increase code size
197 : * further. Since it is unlikely that we'll actually see such domain names, we
198 : * can just refuse to accept them.
199 : */
200 : #define NO_DOMAIN_NAME_RESOLUTION 1 /* 1 to allow only dotted ip addresses */
201 :
202 :
203 : /*
204 : * UPnP does not scale well. If we were in a room with thousands of control
205 : * points then potentially we could be expected to handle subscriptions for
206 : * each of them, which would exhaust our memory. So we must set a limit. In
207 : * practice we are unlikely to see more than one or two.
208 : */
209 : #define MAX_SUBSCRIPTIONS 4 /* how many subscribing clients we handle */
210 : #define MAX_ADDR_PER_SUBSCRIPTION 8
211 :
212 : /* Maximum number of Probe Request events per second */
213 : #define MAX_EVENTS_PER_SEC 5
214 :
215 :
216 : static struct upnp_wps_device_sm *shared_upnp_device = NULL;
217 :
218 :
219 : /* Write the current date/time per RFC */
220 643 : void format_date(struct wpabuf *buf)
221 : {
222 643 : const char *weekday_str = "Sun\0Mon\0Tue\0Wed\0Thu\0Fri\0Sat";
223 643 : const char *month_str = "Jan\0Feb\0Mar\0Apr\0May\0Jun\0"
224 : "Jul\0Aug\0Sep\0Oct\0Nov\0Dec";
225 : struct tm *date;
226 : time_t t;
227 :
228 643 : t = time(NULL);
229 643 : date = gmtime(&t);
230 643 : if (date == NULL)
231 643 : return;
232 2572 : wpabuf_printf(buf, "%s, %02d %s %d %02d:%02d:%02d GMT",
233 643 : &weekday_str[date->tm_wday * 4], date->tm_mday,
234 1286 : &month_str[date->tm_mon * 4], date->tm_year + 1900,
235 : date->tm_hour, date->tm_min, date->tm_sec);
236 : }
237 :
238 :
239 : /***************************************************************************
240 : * UUIDs (unique identifiers)
241 : *
242 : * These are supposed to be unique in all the world.
243 : * Sometimes permanent ones are used, sometimes temporary ones
244 : * based on random numbers... there are different rules for valid content
245 : * of different types.
246 : * Each uuid is 16 bytes long.
247 : **************************************************************************/
248 :
249 : /* uuid_make -- construct a random UUID
250 : * The UPnP documents don't seem to offer any guidelines as to which method to
251 : * use for constructing UUIDs for subscriptions. Presumably any method from
252 : * rfc4122 is good enough; I've chosen random number method.
253 : */
254 12 : static int uuid_make(u8 uuid[UUID_LEN])
255 : {
256 12 : if (os_get_random(uuid, UUID_LEN) < 0)
257 0 : return -1;
258 :
259 : /* Replace certain bits as specified in rfc4122 or X.667 */
260 12 : uuid[6] &= 0x0f; uuid[6] |= (4 << 4); /* version 4 == random gen */
261 12 : uuid[8] &= 0x3f; uuid[8] |= 0x80;
262 :
263 12 : return 0;
264 : }
265 :
266 :
267 : /*
268 : * Subscriber address handling.
269 : * Since a subscriber may have an arbitrary number of addresses, we have to
270 : * add a bunch of code to handle them.
271 : *
272 : * Addresses are passed in text, and MAY be domain names instead of the (usual
273 : * and expected) dotted IP addresses. Resolving domain names consumes a lot of
274 : * resources. Worse, we are currently using the standard Linux getaddrinfo()
275 : * which will block the entire program until complete or timeout! The proper
276 : * solution would be to use the "ares" library or similar with more state
277 : * machine steps etc. or just disable domain name resolution by setting
278 : * NO_DOMAIN_NAME_RESOLUTION to 1 at top of this file.
279 : */
280 :
281 : /* subscr_addr_delete -- delete single unlinked subscriber address
282 : * (be sure to unlink first if need be)
283 : */
284 19 : void subscr_addr_delete(struct subscr_addr *a)
285 : {
286 : /*
287 : * Note: do NOT free domain_and_port or path because they point to
288 : * memory within the allocation of "a".
289 : */
290 19 : os_free(a);
291 19 : }
292 :
293 :
294 : /* subscr_addr_free_all -- unlink and delete list of subscriber addresses. */
295 12 : static void subscr_addr_free_all(struct subscription *s)
296 : {
297 : struct subscr_addr *a, *tmp;
298 31 : dl_list_for_each_safe(a, tmp, &s->addr_list, struct subscr_addr, list)
299 : {
300 19 : dl_list_del(&a->list);
301 19 : subscr_addr_delete(a);
302 : }
303 12 : }
304 :
305 :
306 : /* subscr_addr_add_url -- add address(es) for one url to subscription */
307 35 : static void subscr_addr_add_url(struct subscription *s, const char *url,
308 : size_t url_len)
309 : {
310 : int alloc_len;
311 35 : char *scratch_mem = NULL;
312 : char *mem;
313 : char *host;
314 : char *delim;
315 : char *path;
316 35 : int port = 80; /* port to send to (default is port 80) */
317 : struct addrinfo hints;
318 35 : struct addrinfo *result = NULL;
319 : struct addrinfo *rp;
320 : int rerr;
321 : size_t host_len, path_len;
322 :
323 : /* url MUST begin with http: */
324 35 : if (url_len < 7 || os_strncasecmp(url, "http://", 7))
325 : goto fail;
326 35 : url += 7;
327 35 : url_len -= 7;
328 :
329 : /* Make a copy of the string to allow modification during parsing */
330 35 : scratch_mem = dup_binstr(url, url_len);
331 35 : if (scratch_mem == NULL)
332 0 : goto fail;
333 35 : wpa_printf(MSG_DEBUG, "WPS UPnP: Adding URL '%s'", scratch_mem);
334 35 : host = scratch_mem;
335 35 : path = os_strchr(host, '/');
336 35 : if (path)
337 35 : *path++ = '\0'; /* null terminate host */
338 :
339 : /* Process and remove optional port component */
340 35 : delim = os_strchr(host, ':');
341 35 : if (delim) {
342 35 : *delim = '\0'; /* null terminate host name for now */
343 35 : if (isdigit(delim[1]))
344 35 : port = atol(delim + 1);
345 : }
346 :
347 : /*
348 : * getaddrinfo does the right thing with dotted decimal notations, or
349 : * will resolve domain names. Resolving domain names will unfortunately
350 : * hang the entire program until it is resolved or it times out
351 : * internal to getaddrinfo; fortunately we think that the use of actual
352 : * domain names (vs. dotted decimal notations) should be uncommon.
353 : */
354 35 : os_memset(&hints, 0, sizeof(struct addrinfo));
355 35 : hints.ai_family = AF_INET; /* IPv4 */
356 35 : hints.ai_socktype = SOCK_STREAM;
357 : #if NO_DOMAIN_NAME_RESOLUTION
358 : /* Suppress domain name resolutions that would halt
359 : * the program for periods of time
360 : */
361 35 : hints.ai_flags = AI_NUMERICHOST;
362 : #else
363 : /* Allow domain name resolution. */
364 : hints.ai_flags = 0;
365 : #endif
366 35 : hints.ai_protocol = 0; /* Any protocol? */
367 35 : rerr = getaddrinfo(host, NULL /* fill in port ourselves */,
368 : &hints, &result);
369 35 : if (rerr) {
370 0 : wpa_printf(MSG_INFO, "WPS UPnP: Resolve error %d (%s) on: %s",
371 : rerr, gai_strerror(rerr), host);
372 0 : goto fail;
373 : }
374 :
375 35 : if (delim)
376 35 : *delim = ':'; /* Restore port */
377 :
378 35 : host_len = os_strlen(host);
379 35 : path_len = path ? os_strlen(path) : 0;
380 35 : alloc_len = host_len + 1 + 1 + path_len + 1;
381 :
382 54 : for (rp = result; rp; rp = rp->ai_next) {
383 : struct subscr_addr *a;
384 :
385 : /* Limit no. of address to avoid denial of service attack */
386 35 : if (dl_list_len(&s->addr_list) >= MAX_ADDR_PER_SUBSCRIPTION) {
387 16 : wpa_printf(MSG_INFO, "WPS UPnP: subscr_addr_add_url: "
388 : "Ignoring excessive addresses");
389 16 : break;
390 : }
391 :
392 19 : a = os_zalloc(sizeof(*a) + alloc_len);
393 19 : if (a == NULL)
394 0 : break;
395 19 : mem = (char *) (a + 1);
396 19 : a->domain_and_port = mem;
397 19 : os_memcpy(mem, host, host_len);
398 19 : mem += host_len + 1;
399 19 : a->path = mem;
400 19 : if (path == NULL || path[0] != '/')
401 19 : *mem++ = '/';
402 19 : if (path)
403 19 : os_memcpy(mem, path, path_len);
404 19 : os_memcpy(&a->saddr, rp->ai_addr, sizeof(a->saddr));
405 19 : a->saddr.sin_port = htons(port);
406 :
407 19 : dl_list_add(&s->addr_list, &a->list);
408 : }
409 :
410 : fail:
411 35 : if (result)
412 35 : freeaddrinfo(result);
413 35 : os_free(scratch_mem);
414 35 : }
415 :
416 :
417 : /* subscr_addr_list_create -- create list from urls in string.
418 : * Each url is enclosed by angle brackets.
419 : */
420 12 : static void subscr_addr_list_create(struct subscription *s,
421 : const char *url_list)
422 : {
423 : const char *end;
424 12 : wpa_printf(MSG_DEBUG, "WPS UPnP: Parsing URL list '%s'", url_list);
425 : for (;;) {
426 96 : while (*url_list == ' ' || *url_list == '\t')
427 2 : url_list++;
428 47 : if (*url_list != '<')
429 12 : break;
430 35 : url_list++;
431 35 : end = os_strchr(url_list, '>');
432 35 : if (end == NULL)
433 0 : break;
434 35 : subscr_addr_add_url(s, url_list, end - url_list);
435 35 : url_list = end + 1;
436 35 : }
437 12 : }
438 :
439 :
440 81 : static void wpabuf_put_property(struct wpabuf *buf, const char *name,
441 : const char *value)
442 : {
443 81 : wpabuf_put_str(buf, "<e:property>");
444 81 : wpabuf_printf(buf, "<%s>", name);
445 81 : if (value)
446 81 : wpabuf_put_str(buf, value);
447 81 : wpabuf_printf(buf, "</%s>", name);
448 81 : wpabuf_put_str(buf, "</e:property>\n");
449 81 : }
450 :
451 :
452 : /**
453 : * upnp_wps_device_send_event - Queue event messages for subscribers
454 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
455 : *
456 : * This function queues the last WLANEvent to be sent for all currently
457 : * subscribed UPnP control points. sm->wlanevent must have been set with the
458 : * encoded data before calling this function.
459 : */
460 73 : static void upnp_wps_device_send_event(struct upnp_wps_device_sm *sm)
461 : {
462 : /* Enqueue event message for all subscribers */
463 : struct wpabuf *buf; /* holds event message */
464 73 : int buf_size = 0;
465 : struct subscription *s, *tmp;
466 : /* Actually, utf-8 is the default, but it doesn't hurt to specify it */
467 73 : const char *format_head =
468 : "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
469 : "<e:propertyset xmlns:e=\"urn:schemas-upnp-org:event-1-0\">\n";
470 73 : const char *format_tail = "</e:propertyset>\n";
471 : struct os_reltime now;
472 :
473 73 : if (dl_list_empty(&sm->subscriptions)) {
474 : /* optimize */
475 55 : return;
476 : }
477 :
478 46 : if (os_get_reltime(&now) == 0) {
479 46 : if (now.sec != sm->last_event_sec) {
480 17 : sm->last_event_sec = now.sec;
481 17 : sm->num_events_in_sec = 1;
482 : } else {
483 29 : sm->num_events_in_sec++;
484 : /*
485 : * In theory, this should apply to all WLANEvent
486 : * notifications, but EAP messages are of much higher
487 : * priority and Probe Request notifications should not
488 : * be allowed to drop EAP messages, so only throttle
489 : * Probe Request notifications.
490 : */
491 37 : if (sm->num_events_in_sec > MAX_EVENTS_PER_SEC &&
492 8 : sm->wlanevent_type ==
493 : UPNP_WPS_WLANEVENT_TYPE_PROBE) {
494 1 : wpa_printf(MSG_DEBUG, "WPS UPnP: Throttle "
495 : "event notifications (%u seen "
496 : "during one second)",
497 : sm->num_events_in_sec);
498 1 : return;
499 : }
500 : }
501 : }
502 :
503 : /* Determine buffer size needed first */
504 45 : buf_size += os_strlen(format_head);
505 45 : buf_size += 50 + 2 * os_strlen("WLANEvent");
506 45 : if (sm->wlanevent)
507 45 : buf_size += os_strlen(sm->wlanevent);
508 45 : buf_size += os_strlen(format_tail);
509 :
510 45 : buf = wpabuf_alloc(buf_size);
511 45 : if (buf == NULL)
512 0 : return;
513 45 : wpabuf_put_str(buf, format_head);
514 45 : wpabuf_put_property(buf, "WLANEvent", sm->wlanevent);
515 45 : wpabuf_put_str(buf, format_tail);
516 :
517 45 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: WLANEvent message:\n%s",
518 45 : (char *) wpabuf_head(buf));
519 :
520 90 : dl_list_for_each_safe(s, tmp, &sm->subscriptions, struct subscription,
521 : list) {
522 45 : event_add(s, buf,
523 45 : sm->wlanevent_type == UPNP_WPS_WLANEVENT_TYPE_PROBE);
524 : }
525 :
526 45 : wpabuf_free(buf);
527 : }
528 :
529 :
530 : /*
531 : * Event subscription (subscriber machines register with us to receive event
532 : * messages).
533 : * This is the result of an incoming HTTP over TCP SUBSCRIBE request.
534 : */
535 :
536 : /* subscription_destroy -- destroy an unlinked subscription
537 : * Be sure to unlink first if necessary.
538 : */
539 12 : void subscription_destroy(struct subscription *s)
540 : {
541 : struct upnp_wps_device_interface *iface;
542 12 : wpa_printf(MSG_DEBUG, "WPS UPnP: Destroy subscription %p", s);
543 12 : subscr_addr_free_all(s);
544 12 : event_delete_all(s);
545 24 : dl_list_for_each(iface, &s->sm->interfaces,
546 : struct upnp_wps_device_interface, list)
547 12 : upnp_er_remove_notification(iface->wps->registrar, s);
548 12 : os_free(s);
549 12 : }
550 :
551 :
552 : /* subscription_list_age -- remove expired subscriptions */
553 12 : static void subscription_list_age(struct upnp_wps_device_sm *sm, time_t now)
554 : {
555 : struct subscription *s, *tmp;
556 12 : dl_list_for_each_safe(s, tmp, &sm->subscriptions,
557 : struct subscription, list) {
558 0 : if (s->timeout_time > now)
559 0 : break;
560 0 : wpa_printf(MSG_DEBUG, "WPS UPnP: Removing aged subscription");
561 0 : dl_list_del(&s->list);
562 0 : subscription_destroy(s);
563 : }
564 12 : }
565 :
566 :
567 : /* subscription_find -- return existing subscription matching uuid, if any
568 : * returns NULL if not found
569 : */
570 15 : struct subscription * subscription_find(struct upnp_wps_device_sm *sm,
571 : const u8 uuid[UUID_LEN])
572 : {
573 : struct subscription *s;
574 16 : dl_list_for_each(s, &sm->subscriptions, struct subscription, list) {
575 14 : if (os_memcmp(s->uuid, uuid, UUID_LEN) == 0)
576 13 : return s; /* Found match */
577 : }
578 2 : return NULL;
579 : }
580 :
581 :
582 1 : static struct wpabuf * build_fake_wsc_ack(void)
583 : {
584 1 : struct wpabuf *msg = wpabuf_alloc(100);
585 1 : if (msg == NULL)
586 0 : return NULL;
587 1 : wpabuf_put_u8(msg, UPNP_WPS_WLANEVENT_TYPE_EAP);
588 1 : wpabuf_put_str(msg, "00:00:00:00:00:00");
589 2 : if (wps_build_version(msg) ||
590 1 : wps_build_msg_type(msg, WPS_WSC_ACK)) {
591 0 : wpabuf_free(msg);
592 0 : return NULL;
593 : }
594 : /* Enrollee Nonce */
595 1 : wpabuf_put_be16(msg, ATTR_ENROLLEE_NONCE);
596 1 : wpabuf_put_be16(msg, WPS_NONCE_LEN);
597 1 : wpabuf_put(msg, WPS_NONCE_LEN);
598 : /* Registrar Nonce */
599 1 : wpabuf_put_be16(msg, ATTR_REGISTRAR_NONCE);
600 1 : wpabuf_put_be16(msg, WPS_NONCE_LEN);
601 1 : wpabuf_put(msg, WPS_NONCE_LEN);
602 1 : if (wps_build_wfa_ext(msg, 0, NULL, 0)) {
603 0 : wpabuf_free(msg);
604 0 : return NULL;
605 : }
606 1 : return msg;
607 : }
608 :
609 :
610 : /* subscription_first_event -- send format/queue event that is automatically
611 : * sent on a new subscription.
612 : */
613 12 : static int subscription_first_event(struct subscription *s)
614 : {
615 : /*
616 : * Actually, utf-8 is the default, but it doesn't hurt to specify it.
617 : *
618 : * APStatus is apparently a bit set,
619 : * 0x1 = configuration change (but is always set?)
620 : * 0x10 = ap is locked
621 : *
622 : * Per UPnP spec, we send out the last value of each variable, even
623 : * for WLANEvent, whatever it was.
624 : */
625 : char *wlan_event;
626 : struct wpabuf *buf;
627 12 : int ap_status = 1; /* TODO: add 0x10 if access point is locked */
628 12 : const char *head =
629 : "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
630 : "<e:propertyset xmlns:e=\"urn:schemas-upnp-org:event-1-0\">\n";
631 12 : const char *tail = "</e:propertyset>\n";
632 : char txt[10];
633 : int ret;
634 :
635 12 : if (s->sm->wlanevent == NULL) {
636 : /*
637 : * There has been no events before the subscription. However,
638 : * UPnP device architecture specification requires all the
639 : * evented variables to be included, so generate a dummy event
640 : * for this particular case using a WSC_ACK and all-zeros
641 : * nonces. The ER (UPnP control point) will ignore this, but at
642 : * least it will learn that WLANEvent variable will be used in
643 : * event notifications in the future.
644 : */
645 : struct wpabuf *msg;
646 1 : wpa_printf(MSG_DEBUG, "WPS UPnP: Use a fake WSC_ACK as the "
647 : "initial WLANEvent");
648 1 : msg = build_fake_wsc_ack();
649 1 : if (msg) {
650 2 : s->sm->wlanevent = (char *)
651 1 : base64_encode(wpabuf_head(msg),
652 : wpabuf_len(msg), NULL);
653 1 : wpabuf_free(msg);
654 : }
655 : }
656 :
657 12 : wlan_event = s->sm->wlanevent;
658 12 : if (wlan_event == NULL || *wlan_event == '\0') {
659 0 : wpa_printf(MSG_DEBUG, "WPS UPnP: WLANEvent not known for "
660 : "initial event message");
661 0 : wlan_event = "";
662 : }
663 12 : buf = wpabuf_alloc(500 + os_strlen(wlan_event));
664 12 : if (buf == NULL)
665 0 : return -1;
666 :
667 12 : wpabuf_put_str(buf, head);
668 12 : wpabuf_put_property(buf, "STAStatus", "1");
669 12 : os_snprintf(txt, sizeof(txt), "%d", ap_status);
670 12 : wpabuf_put_property(buf, "APStatus", txt);
671 12 : if (*wlan_event)
672 12 : wpabuf_put_property(buf, "WLANEvent", wlan_event);
673 12 : wpabuf_put_str(buf, tail);
674 :
675 12 : ret = event_add(s, buf, 0);
676 12 : if (ret) {
677 0 : wpabuf_free(buf);
678 0 : return ret;
679 : }
680 12 : wpabuf_free(buf);
681 :
682 12 : return 0;
683 : }
684 :
685 :
686 : /**
687 : * subscription_start - Remember a UPnP control point to send events to.
688 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
689 : * @callback_urls: Callback URLs
690 : * Returns: %NULL on error, or pointer to new subscription structure.
691 : */
692 12 : struct subscription * subscription_start(struct upnp_wps_device_sm *sm,
693 : const char *callback_urls)
694 : {
695 : struct subscription *s;
696 12 : time_t now = time(NULL);
697 12 : time_t expire = now + UPNP_SUBSCRIBE_SEC;
698 :
699 : /* Get rid of expired subscriptions so we have room */
700 12 : subscription_list_age(sm, now);
701 :
702 : /* If too many subscriptions, remove oldest */
703 12 : if (dl_list_len(&sm->subscriptions) >= MAX_SUBSCRIPTIONS) {
704 0 : s = dl_list_first(&sm->subscriptions, struct subscription,
705 : list);
706 0 : if (s) {
707 0 : wpa_printf(MSG_INFO,
708 : "WPS UPnP: Too many subscriptions, trashing oldest");
709 0 : dl_list_del(&s->list);
710 0 : subscription_destroy(s);
711 : }
712 : }
713 :
714 12 : s = os_zalloc(sizeof(*s));
715 12 : if (s == NULL)
716 0 : return NULL;
717 12 : dl_list_init(&s->addr_list);
718 12 : dl_list_init(&s->event_queue);
719 :
720 12 : s->sm = sm;
721 12 : s->timeout_time = expire;
722 12 : if (uuid_make(s->uuid) < 0) {
723 0 : subscription_destroy(s);
724 0 : return NULL;
725 : }
726 12 : subscr_addr_list_create(s, callback_urls);
727 12 : if (dl_list_empty(&s->addr_list)) {
728 0 : wpa_printf(MSG_DEBUG, "WPS UPnP: No valid callback URLs in "
729 : "'%s' - drop subscription", callback_urls);
730 0 : subscription_destroy(s);
731 0 : return NULL;
732 : }
733 :
734 : /* Add to end of list, since it has the highest expiration time */
735 12 : dl_list_add_tail(&sm->subscriptions, &s->list);
736 : /* Queue up immediate event message (our last event)
737 : * as required by UPnP spec.
738 : */
739 12 : if (subscription_first_event(s)) {
740 0 : wpa_printf(MSG_INFO, "WPS UPnP: Dropping subscriber due to "
741 : "event backlog");
742 0 : dl_list_del(&s->list);
743 0 : subscription_destroy(s);
744 0 : return NULL;
745 : }
746 12 : wpa_printf(MSG_DEBUG, "WPS UPnP: Subscription %p started with %s",
747 : s, callback_urls);
748 : /* Schedule sending this */
749 12 : event_send_all_later(sm);
750 12 : return s;
751 : }
752 :
753 :
754 : /* subscription_renew -- find subscription and reset timeout */
755 3 : struct subscription * subscription_renew(struct upnp_wps_device_sm *sm,
756 : const u8 uuid[UUID_LEN])
757 : {
758 3 : time_t now = time(NULL);
759 3 : time_t expire = now + UPNP_SUBSCRIBE_SEC;
760 3 : struct subscription *s = subscription_find(sm, uuid);
761 3 : if (s == NULL)
762 1 : return NULL;
763 2 : wpa_printf(MSG_DEBUG, "WPS UPnP: Subscription renewed");
764 2 : dl_list_del(&s->list);
765 2 : s->timeout_time = expire;
766 : /* add back to end of list, since it now has highest expiry */
767 2 : dl_list_add_tail(&sm->subscriptions, &s->list);
768 2 : return s;
769 : }
770 :
771 :
772 : /**
773 : * upnp_wps_device_send_wlan_event - Event notification
774 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
775 : * @from_mac_addr: Source (Enrollee) MAC address for the event
776 : * @ev_type: Event type
777 : * @msg: Event data
778 : * Returns: 0 on success, -1 on failure
779 : *
780 : * Tell external Registrars (UPnP control points) that something happened. In
781 : * particular, events include WPS messages from clients that are proxied to
782 : * external Registrars.
783 : */
784 517 : int upnp_wps_device_send_wlan_event(struct upnp_wps_device_sm *sm,
785 : const u8 from_mac_addr[ETH_ALEN],
786 : enum upnp_wps_wlanevent_type ev_type,
787 : const struct wpabuf *msg)
788 : {
789 517 : int ret = -1;
790 : char type[2];
791 517 : const u8 *mac = from_mac_addr;
792 : char mac_text[18];
793 517 : u8 *raw = NULL;
794 : size_t raw_len;
795 : char *val;
796 : size_t val_len;
797 517 : int pos = 0;
798 :
799 517 : if (!sm)
800 444 : goto fail;
801 :
802 73 : os_snprintf(type, sizeof(type), "%1u", ev_type);
803 :
804 73 : raw_len = 1 + 17 + (msg ? wpabuf_len(msg) : 0);
805 73 : raw = os_zalloc(raw_len);
806 73 : if (!raw)
807 0 : goto fail;
808 :
809 73 : *(raw + pos) = (u8) ev_type;
810 73 : pos += 1;
811 73 : os_snprintf(mac_text, sizeof(mac_text), MACSTR, MAC2STR(mac));
812 73 : wpa_printf(MSG_DEBUG, "WPS UPnP: Proxying WLANEvent from %s",
813 : mac_text);
814 73 : os_memcpy(raw + pos, mac_text, 17);
815 73 : pos += 17;
816 73 : if (msg) {
817 73 : os_memcpy(raw + pos, wpabuf_head(msg), wpabuf_len(msg));
818 73 : pos += wpabuf_len(msg);
819 : }
820 73 : raw_len = pos;
821 :
822 73 : val = (char *) base64_encode(raw, raw_len, &val_len);
823 73 : if (val == NULL)
824 0 : goto fail;
825 :
826 73 : os_free(sm->wlanevent);
827 73 : sm->wlanevent = val;
828 73 : sm->wlanevent_type = ev_type;
829 73 : upnp_wps_device_send_event(sm);
830 :
831 73 : ret = 0;
832 :
833 : fail:
834 517 : os_free(raw);
835 :
836 517 : return ret;
837 : }
838 :
839 :
840 : #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
841 : #include <sys/sysctl.h>
842 : #include <net/route.h>
843 : #include <net/if_dl.h>
844 :
845 : static int eth_get(const char *device, u8 ea[ETH_ALEN])
846 : {
847 : struct if_msghdr *ifm;
848 : struct sockaddr_dl *sdl;
849 : u_char *p, *buf;
850 : size_t len;
851 : int mib[] = { CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0 };
852 :
853 : if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
854 : return -1;
855 : if ((buf = os_malloc(len)) == NULL)
856 : return -1;
857 : if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
858 : os_free(buf);
859 : return -1;
860 : }
861 : for (p = buf; p < buf + len; p += ifm->ifm_msglen) {
862 : ifm = (struct if_msghdr *)p;
863 : sdl = (struct sockaddr_dl *)(ifm + 1);
864 : if (ifm->ifm_type != RTM_IFINFO ||
865 : (ifm->ifm_addrs & RTA_IFP) == 0)
866 : continue;
867 : if (sdl->sdl_family != AF_LINK || sdl->sdl_nlen == 0 ||
868 : os_memcmp(sdl->sdl_data, device, sdl->sdl_nlen) != 0)
869 : continue;
870 : os_memcpy(ea, LLADDR(sdl), sdl->sdl_alen);
871 : break;
872 : }
873 : os_free(buf);
874 :
875 : if (p >= buf + len) {
876 : errno = ESRCH;
877 : return -1;
878 : }
879 : return 0;
880 : }
881 : #endif /* __FreeBSD__ */
882 :
883 :
884 : /**
885 : * get_netif_info - Get hw and IP addresses for network device
886 : * @net_if: Selected network interface name
887 : * @ip_addr: Buffer for returning IP address in network byte order
888 : * @ip_addr_text: Buffer for returning a pointer to allocated IP address text
889 : * @mac: Buffer for returning MAC address
890 : * Returns: 0 on success, -1 on failure
891 : */
892 26 : int get_netif_info(const char *net_if, unsigned *ip_addr, char **ip_addr_text,
893 : u8 mac[ETH_ALEN])
894 : {
895 : struct ifreq req;
896 26 : int sock = -1;
897 : struct sockaddr_in *addr;
898 : struct in_addr in_addr;
899 :
900 26 : *ip_addr_text = os_zalloc(16);
901 26 : if (*ip_addr_text == NULL)
902 0 : goto fail;
903 :
904 26 : sock = socket(AF_INET, SOCK_DGRAM, 0);
905 26 : if (sock < 0)
906 0 : goto fail;
907 :
908 26 : os_strlcpy(req.ifr_name, net_if, sizeof(req.ifr_name));
909 26 : if (ioctl(sock, SIOCGIFADDR, &req) < 0) {
910 0 : wpa_printf(MSG_ERROR, "WPS UPnP: SIOCGIFADDR failed: %d (%s)",
911 0 : errno, strerror(errno));
912 0 : goto fail;
913 : }
914 26 : addr = (void *) &req.ifr_addr;
915 26 : *ip_addr = addr->sin_addr.s_addr;
916 26 : in_addr.s_addr = *ip_addr;
917 26 : os_snprintf(*ip_addr_text, 16, "%s", inet_ntoa(in_addr));
918 :
919 : #ifdef __linux__
920 26 : os_strlcpy(req.ifr_name, net_if, sizeof(req.ifr_name));
921 26 : if (ioctl(sock, SIOCGIFHWADDR, &req) < 0) {
922 0 : wpa_printf(MSG_ERROR, "WPS UPnP: SIOCGIFHWADDR failed: "
923 0 : "%d (%s)", errno, strerror(errno));
924 0 : goto fail;
925 : }
926 26 : os_memcpy(mac, req.ifr_addr.sa_data, 6);
927 : #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
928 : if (eth_get(net_if, mac) < 0) {
929 : wpa_printf(MSG_ERROR, "WPS UPnP: Failed to get MAC address");
930 : goto fail;
931 : }
932 : #else
933 : #error MAC address fetch not implemented
934 : #endif
935 :
936 26 : close(sock);
937 26 : return 0;
938 :
939 : fail:
940 0 : if (sock >= 0)
941 0 : close(sock);
942 0 : os_free(*ip_addr_text);
943 0 : *ip_addr_text = NULL;
944 0 : return -1;
945 : }
946 :
947 :
948 16 : static void upnp_wps_free_msearchreply(struct dl_list *head)
949 : {
950 : struct advertisement_state_machine *a, *tmp;
951 17 : dl_list_for_each_safe(a, tmp, head, struct advertisement_state_machine,
952 : list)
953 1 : msearchreply_state_machine_stop(a);
954 16 : }
955 :
956 :
957 16 : static void upnp_wps_free_subscriptions(struct dl_list *head,
958 : struct wps_registrar *reg)
959 : {
960 : struct subscription *s, *tmp;
961 17 : dl_list_for_each_safe(s, tmp, head, struct subscription, list) {
962 1 : if (reg && s->reg != reg)
963 0 : continue;
964 1 : dl_list_del(&s->list);
965 1 : subscription_destroy(s);
966 : }
967 16 : }
968 :
969 :
970 : /**
971 : * upnp_wps_device_stop - Stop WPS UPnP operations on an interface
972 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
973 : */
974 16 : static void upnp_wps_device_stop(struct upnp_wps_device_sm *sm)
975 : {
976 16 : if (!sm || !sm->started)
977 16 : return;
978 :
979 16 : wpa_printf(MSG_DEBUG, "WPS UPnP: Stop device");
980 16 : web_listener_stop(sm);
981 16 : ssdp_listener_stop(sm);
982 16 : upnp_wps_free_msearchreply(&sm->msearch_replies);
983 16 : upnp_wps_free_subscriptions(&sm->subscriptions, NULL);
984 :
985 16 : advertisement_state_machine_stop(sm, 1);
986 :
987 16 : event_send_stop_all(sm);
988 16 : os_free(sm->wlanevent);
989 16 : sm->wlanevent = NULL;
990 16 : os_free(sm->ip_addr_text);
991 16 : sm->ip_addr_text = NULL;
992 16 : if (sm->multicast_sd >= 0)
993 16 : close(sm->multicast_sd);
994 16 : sm->multicast_sd = -1;
995 :
996 16 : sm->started = 0;
997 : }
998 :
999 :
1000 : /**
1001 : * upnp_wps_device_start - Start WPS UPnP operations on an interface
1002 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
1003 : * @net_if: Selected network interface name
1004 : * Returns: 0 on success, -1 on failure
1005 : */
1006 16 : static int upnp_wps_device_start(struct upnp_wps_device_sm *sm, char *net_if)
1007 : {
1008 16 : if (!sm || !net_if)
1009 0 : return -1;
1010 :
1011 16 : if (sm->started)
1012 0 : upnp_wps_device_stop(sm);
1013 :
1014 16 : sm->multicast_sd = -1;
1015 16 : sm->ssdp_sd = -1;
1016 16 : sm->started = 1;
1017 16 : sm->advertise_count = 0;
1018 :
1019 : /* Fix up linux multicast handling */
1020 16 : if (add_ssdp_network(net_if))
1021 0 : goto fail;
1022 :
1023 : /* Determine which IP and mac address we're using */
1024 16 : if (get_netif_info(net_if, &sm->ip_addr, &sm->ip_addr_text,
1025 16 : sm->mac_addr)) {
1026 0 : wpa_printf(MSG_INFO, "WPS UPnP: Could not get IP/MAC address "
1027 : "for %s. Does it have IP address?", net_if);
1028 0 : goto fail;
1029 : }
1030 :
1031 : /* Listen for incoming TCP connections so that others
1032 : * can fetch our "xml files" from us.
1033 : */
1034 16 : if (web_listener_start(sm))
1035 0 : goto fail;
1036 :
1037 : /* Set up for receiving discovery (UDP) packets */
1038 16 : if (ssdp_listener_start(sm))
1039 0 : goto fail;
1040 :
1041 : /* Set up for sending multicast */
1042 16 : if (ssdp_open_multicast(sm) < 0)
1043 0 : goto fail;
1044 :
1045 : /*
1046 : * Broadcast NOTIFY messages to let the world know we exist.
1047 : * This is done via a state machine since the messages should not be
1048 : * all sent out at once.
1049 : */
1050 16 : if (advertisement_state_machine_start(sm))
1051 0 : goto fail;
1052 :
1053 16 : return 0;
1054 :
1055 : fail:
1056 0 : upnp_wps_device_stop(sm);
1057 0 : return -1;
1058 : }
1059 :
1060 :
1061 : static struct upnp_wps_device_interface *
1062 16 : upnp_wps_get_iface(struct upnp_wps_device_sm *sm, void *priv)
1063 : {
1064 : struct upnp_wps_device_interface *iface;
1065 16 : dl_list_for_each(iface, &sm->interfaces,
1066 : struct upnp_wps_device_interface, list) {
1067 16 : if (iface->priv == priv)
1068 16 : return iface;
1069 : }
1070 0 : return NULL;
1071 : }
1072 :
1073 :
1074 : /**
1075 : * upnp_wps_device_deinit - Deinitialize WPS UPnP
1076 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
1077 : * @priv: External context data that was used in upnp_wps_device_init() call
1078 : */
1079 320 : void upnp_wps_device_deinit(struct upnp_wps_device_sm *sm, void *priv)
1080 : {
1081 : struct upnp_wps_device_interface *iface;
1082 :
1083 320 : if (!sm)
1084 304 : return;
1085 :
1086 16 : iface = upnp_wps_get_iface(sm, priv);
1087 16 : if (iface == NULL) {
1088 0 : wpa_printf(MSG_ERROR, "WPS UPnP: Could not find the interface "
1089 : "instance to deinit");
1090 0 : return;
1091 : }
1092 16 : wpa_printf(MSG_DEBUG, "WPS UPnP: Deinit interface instance %p", iface);
1093 16 : if (dl_list_len(&sm->interfaces) == 1) {
1094 16 : wpa_printf(MSG_DEBUG, "WPS UPnP: Deinitializing last instance "
1095 : "- free global device instance");
1096 16 : upnp_wps_device_stop(sm);
1097 : } else
1098 0 : upnp_wps_free_subscriptions(&sm->subscriptions,
1099 0 : iface->wps->registrar);
1100 16 : dl_list_del(&iface->list);
1101 :
1102 16 : if (iface->peer.wps)
1103 11 : wps_deinit(iface->peer.wps);
1104 16 : os_free(iface->ctx->ap_pin);
1105 16 : os_free(iface->ctx);
1106 16 : os_free(iface);
1107 :
1108 16 : if (dl_list_empty(&sm->interfaces)) {
1109 16 : os_free(sm->root_dir);
1110 16 : os_free(sm->desc_url);
1111 16 : os_free(sm);
1112 16 : shared_upnp_device = NULL;
1113 : }
1114 : }
1115 :
1116 :
1117 : /**
1118 : * upnp_wps_device_init - Initialize WPS UPnP
1119 : * @ctx: callback table; we must eventually free it
1120 : * @wps: Pointer to longterm WPS context
1121 : * @priv: External context data that will be used in callbacks
1122 : * @net_if: Selected network interface name
1123 : * Returns: WPS UPnP state or %NULL on failure
1124 : */
1125 : struct upnp_wps_device_sm *
1126 16 : upnp_wps_device_init(struct upnp_wps_device_ctx *ctx, struct wps_context *wps,
1127 : void *priv, char *net_if)
1128 : {
1129 : struct upnp_wps_device_sm *sm;
1130 : struct upnp_wps_device_interface *iface;
1131 16 : int start = 0;
1132 :
1133 16 : iface = os_zalloc(sizeof(*iface));
1134 16 : if (iface == NULL) {
1135 0 : os_free(ctx->ap_pin);
1136 0 : os_free(ctx);
1137 0 : return NULL;
1138 : }
1139 16 : wpa_printf(MSG_DEBUG, "WPS UPnP: Init interface instance %p", iface);
1140 :
1141 16 : iface->ctx = ctx;
1142 16 : iface->wps = wps;
1143 16 : iface->priv = priv;
1144 :
1145 16 : if (shared_upnp_device) {
1146 0 : wpa_printf(MSG_DEBUG, "WPS UPnP: Share existing device "
1147 : "context");
1148 0 : sm = shared_upnp_device;
1149 : } else {
1150 16 : wpa_printf(MSG_DEBUG, "WPS UPnP: Initialize device context");
1151 16 : sm = os_zalloc(sizeof(*sm));
1152 16 : if (!sm) {
1153 0 : wpa_printf(MSG_ERROR, "WPS UPnP: upnp_wps_device_init "
1154 : "failed");
1155 0 : os_free(iface);
1156 0 : os_free(ctx->ap_pin);
1157 0 : os_free(ctx);
1158 0 : return NULL;
1159 : }
1160 16 : shared_upnp_device = sm;
1161 :
1162 16 : dl_list_init(&sm->msearch_replies);
1163 16 : dl_list_init(&sm->subscriptions);
1164 16 : dl_list_init(&sm->interfaces);
1165 16 : start = 1;
1166 : }
1167 :
1168 16 : dl_list_add(&sm->interfaces, &iface->list);
1169 :
1170 16 : if (start && upnp_wps_device_start(sm, net_if)) {
1171 0 : upnp_wps_device_deinit(sm, priv);
1172 0 : return NULL;
1173 : }
1174 :
1175 :
1176 16 : return sm;
1177 : }
1178 :
1179 :
1180 : /**
1181 : * upnp_wps_subscribers - Check whether there are any event subscribers
1182 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
1183 : * Returns: 0 if no subscribers, 1 if subscribers
1184 : */
1185 17 : int upnp_wps_subscribers(struct upnp_wps_device_sm *sm)
1186 : {
1187 17 : return !dl_list_empty(&sm->subscriptions);
1188 : }
1189 :
1190 :
1191 10 : int upnp_wps_set_ap_pin(struct upnp_wps_device_sm *sm, const char *ap_pin)
1192 : {
1193 : struct upnp_wps_device_interface *iface;
1194 10 : if (sm == NULL)
1195 1 : return 0;
1196 :
1197 18 : dl_list_for_each(iface, &sm->interfaces,
1198 : struct upnp_wps_device_interface, list) {
1199 9 : os_free(iface->ctx->ap_pin);
1200 9 : if (ap_pin) {
1201 4 : iface->ctx->ap_pin = os_strdup(ap_pin);
1202 4 : if (iface->ctx->ap_pin == NULL)
1203 0 : return -1;
1204 : } else
1205 5 : iface->ctx->ap_pin = NULL;
1206 : }
1207 :
1208 9 : return 0;
1209 : }
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