Line data Source code
1 : /*
2 : * UPnP SSDP for WPS
3 : * Copyright (c) 2000-2003 Intel Corporation
4 : * Copyright (c) 2006-2007 Sony Corporation
5 : * Copyright (c) 2008-2009 Atheros Communications
6 : * Copyright (c) 2009-2013, Jouni Malinen <j@w1.fi>
7 : *
8 : * See wps_upnp.c for more details on licensing and code history.
9 : */
10 :
11 : #include "includes.h"
12 :
13 : #include <fcntl.h>
14 : #include <sys/ioctl.h>
15 : #include <net/route.h>
16 : #ifdef __linux__
17 : #include <net/if.h>
18 : #endif /* __linux__ */
19 :
20 : #include "common.h"
21 : #include "uuid.h"
22 : #include "eloop.h"
23 : #include "wps.h"
24 : #include "wps_upnp.h"
25 : #include "wps_upnp_i.h"
26 :
27 : #define UPNP_CACHE_SEC (UPNP_CACHE_SEC_MIN + 1) /* cache time we use */
28 : #define UPNP_CACHE_SEC_MIN 1800 /* min cachable time per UPnP standard */
29 : #define UPNP_ADVERTISE_REPEAT 2 /* no more than 3 */
30 : #define MAX_MSEARCH 20 /* max simultaneous M-SEARCH replies ongoing */
31 : #define SSDP_TARGET "239.0.0.0"
32 : #define SSDP_NETMASK "255.0.0.0"
33 :
34 :
35 : /* Check tokens for equality, where tokens consist of letters, digits,
36 : * underscore and hyphen, and are matched case insensitive.
37 : */
38 1454 : static int token_eq(const char *s1, const char *s2)
39 : {
40 : int c1;
41 : int c2;
42 1454 : int end1 = 0;
43 1454 : int end2 = 0;
44 : for (;;) {
45 2700 : c1 = *s1++;
46 2700 : c2 = *s2++;
47 2700 : if (isalpha(c1) && isupper(c1))
48 1843 : c1 = tolower(c1);
49 2700 : if (isalpha(c2) && isupper(c2))
50 0 : c2 = tolower(c2);
51 2700 : end1 = !(isalnum(c1) || c1 == '_' || c1 == '-');
52 2700 : end2 = !(isalnum(c2) || c2 == '_' || c2 == '-');
53 2700 : if (end1 || end2 || c1 != c2)
54 : break;
55 1246 : }
56 1454 : return end1 && end2; /* reached end of both words? */
57 : }
58 :
59 :
60 : /* Return length of token (see above for definition of token) */
61 311 : static int token_length(const char *s)
62 : {
63 311 : const char *begin = s;
64 726 : for (;; s++) {
65 1037 : int c = *s;
66 1037 : int end = !(isalnum(c) || c == '_' || c == '-');
67 1037 : if (end)
68 311 : break;
69 726 : }
70 311 : return s - begin;
71 : }
72 :
73 :
74 : /* return length of interword separation.
75 : * This accepts only spaces/tabs and thus will not traverse a line
76 : * or buffer ending.
77 : */
78 619 : static int word_separation_length(const char *s)
79 : {
80 619 : const char *begin = s;
81 313 : for (;; s++) {
82 932 : int c = *s;
83 932 : if (c == ' ' || c == '\t')
84 313 : continue;
85 619 : break;
86 313 : }
87 619 : return s - begin;
88 : }
89 :
90 :
91 : /* No. of chars through (including) end of line */
92 624 : static int line_length(const char *l)
93 : {
94 624 : const char *lp = l;
95 12955 : while (*lp && *lp != '\n')
96 11707 : lp++;
97 624 : if (*lp == '\n')
98 623 : lp++;
99 624 : return lp - l;
100 : }
101 :
102 :
103 : /***************************************************************************
104 : * Advertisements.
105 : * These are multicast to the world to tell them we are here.
106 : * The individual packets are spread out in time to limit loss,
107 : * and then after a much longer period of time the whole sequence
108 : * is repeated again (for NOTIFYs only).
109 : **************************************************************************/
110 :
111 : /**
112 : * next_advertisement - Build next message and advance the state machine
113 : * @a: Advertisement state
114 : * @islast: Buffer for indicating whether this is the last message (= 1)
115 : * Returns: The new message (caller is responsible for freeing this)
116 : *
117 : * Note: next_advertisement is shared code with msearchreply_* functions
118 : */
119 : static struct wpabuf *
120 1459 : next_advertisement(struct upnp_wps_device_sm *sm,
121 : struct advertisement_state_machine *a, int *islast)
122 : {
123 : struct wpabuf *msg;
124 1459 : char *NTString = "";
125 : char uuid_string[80];
126 : struct upnp_wps_device_interface *iface;
127 :
128 1459 : *islast = 0;
129 1459 : iface = dl_list_first(&sm->interfaces,
130 : struct upnp_wps_device_interface, list);
131 1459 : if (!iface)
132 0 : return NULL;
133 1459 : uuid_bin2str(iface->wps->uuid, uuid_string, sizeof(uuid_string));
134 1459 : msg = wpabuf_alloc(800); /* more than big enough */
135 1459 : if (msg == NULL)
136 1 : return NULL;
137 1458 : switch (a->type) {
138 : case ADVERTISE_UP:
139 : case ADVERTISE_DOWN:
140 856 : NTString = "NT";
141 856 : wpabuf_put_str(msg, "NOTIFY * HTTP/1.1\r\n");
142 856 : wpabuf_printf(msg, "HOST: %s:%d\r\n",
143 : UPNP_MULTICAST_ADDRESS, UPNP_MULTICAST_PORT);
144 856 : wpabuf_printf(msg, "CACHE-CONTROL: max-age=%d\r\n",
145 : UPNP_CACHE_SEC);
146 856 : wpabuf_printf(msg, "NTS: %s\r\n",
147 856 : (a->type == ADVERTISE_UP ?
148 : "ssdp:alive" : "ssdp:byebye"));
149 856 : break;
150 : case MSEARCH_REPLY:
151 602 : NTString = "ST";
152 602 : wpabuf_put_str(msg, "HTTP/1.1 200 OK\r\n");
153 602 : wpabuf_printf(msg, "CACHE-CONTROL: max-age=%d\r\n",
154 : UPNP_CACHE_SEC);
155 :
156 602 : wpabuf_put_str(msg, "DATE: ");
157 602 : format_date(msg);
158 602 : wpabuf_put_str(msg, "\r\n");
159 :
160 602 : wpabuf_put_str(msg, "EXT:\r\n");
161 602 : break;
162 : }
163 :
164 1458 : if (a->type != ADVERTISE_DOWN) {
165 : /* Where others may get our XML files from */
166 890 : wpabuf_printf(msg, "LOCATION: http://%s:%d/%s\r\n",
167 : sm->ip_addr_text, sm->web_port,
168 : UPNP_WPS_DEVICE_XML_FILE);
169 : }
170 :
171 : /* The SERVER line has three comma-separated fields:
172 : * operating system / version
173 : * upnp version
174 : * software package / version
175 : * However, only the UPnP version is really required, the
176 : * others can be place holders... for security reasons
177 : * it is better to NOT provide extra information.
178 : */
179 1458 : wpabuf_put_str(msg, "SERVER: Unspecified, UPnP/1.0, Unspecified\r\n");
180 :
181 1458 : switch (a->state / UPNP_ADVERTISE_REPEAT) {
182 : case 0:
183 372 : wpabuf_printf(msg, "%s: upnp:rootdevice\r\n", NTString);
184 372 : wpabuf_printf(msg, "USN: uuid:%s::upnp:rootdevice\r\n",
185 : uuid_string);
186 372 : break;
187 : case 1:
188 372 : wpabuf_printf(msg, "%s: uuid:%s\r\n", NTString, uuid_string);
189 372 : wpabuf_printf(msg, "USN: uuid:%s\r\n", uuid_string);
190 372 : break;
191 : case 2:
192 369 : wpabuf_printf(msg, "%s: urn:schemas-wifialliance-org:device:"
193 : "WFADevice:1\r\n", NTString);
194 369 : wpabuf_printf(msg, "USN: uuid:%s::urn:schemas-wifialliance-"
195 : "org:device:WFADevice:1\r\n", uuid_string);
196 369 : break;
197 : case 3:
198 345 : wpabuf_printf(msg, "%s: urn:schemas-wifialliance-org:service:"
199 : "WFAWLANConfig:1\r\n", NTString);
200 345 : wpabuf_printf(msg, "USN: uuid:%s::urn:schemas-wifialliance-"
201 : "org:service:WFAWLANConfig:1\r\n", uuid_string);
202 345 : break;
203 : }
204 1458 : wpabuf_put_str(msg, "\r\n");
205 :
206 1458 : if (a->state + 1 >= 4 * UPNP_ADVERTISE_REPEAT)
207 170 : *islast = 1;
208 :
209 1458 : return msg;
210 : }
211 :
212 :
213 : static void advertisement_state_machine_handler(void *eloop_data,
214 : void *user_ctx);
215 :
216 :
217 : /**
218 : * advertisement_state_machine_stop - Stop SSDP advertisements
219 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
220 : * @send_byebye: Send byebye advertisement messages immediately
221 : */
222 74 : void advertisement_state_machine_stop(struct upnp_wps_device_sm *sm,
223 : int send_byebye)
224 : {
225 74 : struct advertisement_state_machine *a = &sm->advertisement;
226 74 : int islast = 0;
227 : struct wpabuf *msg;
228 : struct sockaddr_in dest;
229 :
230 74 : eloop_cancel_timeout(advertisement_state_machine_handler, NULL, sm);
231 74 : if (!send_byebye || sm->multicast_sd < 0)
232 112 : return;
233 :
234 36 : a->type = ADVERTISE_DOWN;
235 36 : a->state = 0;
236 :
237 36 : os_memset(&dest, 0, sizeof(dest));
238 36 : dest.sin_family = AF_INET;
239 36 : dest.sin_addr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
240 36 : dest.sin_port = htons(UPNP_MULTICAST_PORT);
241 :
242 352 : while (!islast) {
243 281 : msg = next_advertisement(sm, a, &islast);
244 281 : if (msg == NULL)
245 1 : break;
246 280 : if (sendto(sm->multicast_sd, wpabuf_head(msg), wpabuf_len(msg),
247 : 0, (struct sockaddr *) &dest, sizeof(dest)) < 0) {
248 0 : wpa_printf(MSG_INFO, "WPS UPnP: Advertisement sendto "
249 0 : "failed: %d (%s)", errno, strerror(errno));
250 : }
251 280 : wpabuf_free(msg);
252 280 : a->state++;
253 : }
254 : }
255 :
256 :
257 576 : static void advertisement_state_machine_handler(void *eloop_data,
258 : void *user_ctx)
259 : {
260 576 : struct upnp_wps_device_sm *sm = user_ctx;
261 576 : struct advertisement_state_machine *a = &sm->advertisement;
262 : struct wpabuf *msg;
263 576 : int next_timeout_msec = 100;
264 576 : int next_timeout_sec = 0;
265 : struct sockaddr_in dest;
266 576 : int islast = 0;
267 :
268 : /*
269 : * Each is sent twice (in case lost) w/ 100 msec delay between;
270 : * spec says no more than 3 times.
271 : * One pair for rootdevice, one pair for uuid, and a pair each for
272 : * each of the two urns.
273 : * The entire sequence must be repeated before cache control timeout
274 : * (which is min 1800 seconds),
275 : * recommend random portion of half of the advertised cache control age
276 : * to ensure against loss... perhaps 1800/4 + rand*1800/4 ?
277 : * Delay random interval < 100 msec prior to initial sending.
278 : * TTL of 4
279 : */
280 :
281 576 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: Advertisement state=%d", a->state);
282 576 : msg = next_advertisement(sm, a, &islast);
283 576 : if (msg == NULL)
284 576 : return;
285 :
286 576 : os_memset(&dest, 0, sizeof(dest));
287 576 : dest.sin_family = AF_INET;
288 576 : dest.sin_addr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
289 576 : dest.sin_port = htons(UPNP_MULTICAST_PORT);
290 :
291 576 : if (sendto(sm->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0,
292 : (struct sockaddr *) &dest, sizeof(dest)) == -1) {
293 0 : wpa_printf(MSG_ERROR, "WPS UPnP: Advertisement sendto failed:"
294 0 : "%d (%s)", errno, strerror(errno));
295 0 : next_timeout_msec = 0;
296 0 : next_timeout_sec = 10; /* ... later */
297 576 : } else if (islast) {
298 72 : a->state = 0; /* wrap around */
299 72 : if (a->type == ADVERTISE_DOWN) {
300 36 : wpa_printf(MSG_DEBUG, "WPS UPnP: ADVERTISE_DOWN->UP");
301 36 : a->type = ADVERTISE_UP;
302 : /* do it all over again right away */
303 : } else {
304 : u16 r;
305 : /*
306 : * Start over again after a long timeout
307 : * (see notes above)
308 : */
309 36 : next_timeout_msec = 0;
310 36 : if (os_get_random((void *) &r, sizeof(r)) < 0)
311 0 : r = 32768;
312 36 : next_timeout_sec = UPNP_CACHE_SEC / 4 +
313 36 : (((UPNP_CACHE_SEC / 4) * r) >> 16);
314 36 : sm->advertise_count++;
315 36 : wpa_printf(MSG_DEBUG, "WPS UPnP: ADVERTISE_UP (#%u); "
316 : "next in %d sec",
317 : sm->advertise_count, next_timeout_sec);
318 : }
319 : } else {
320 504 : a->state++;
321 : }
322 :
323 576 : wpabuf_free(msg);
324 :
325 576 : eloop_register_timeout(next_timeout_sec, next_timeout_msec,
326 : advertisement_state_machine_handler, NULL, sm);
327 : }
328 :
329 :
330 : /**
331 : * advertisement_state_machine_start - Start SSDP advertisements
332 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
333 : * Returns: 0 on success, -1 on failure
334 : */
335 36 : int advertisement_state_machine_start(struct upnp_wps_device_sm *sm)
336 : {
337 36 : struct advertisement_state_machine *a = &sm->advertisement;
338 : int next_timeout_msec;
339 :
340 36 : advertisement_state_machine_stop(sm, 0);
341 :
342 : /*
343 : * Start out advertising down, this automatically switches
344 : * to advertising up which signals our restart.
345 : */
346 36 : a->type = ADVERTISE_DOWN;
347 36 : a->state = 0;
348 : /* (other fields not used here) */
349 :
350 : /* First timeout should be random interval < 100 msec */
351 36 : next_timeout_msec = (100 * (os_random() & 0xFF)) >> 8;
352 36 : return eloop_register_timeout(0, next_timeout_msec,
353 : advertisement_state_machine_handler,
354 : NULL, sm);
355 : }
356 :
357 :
358 : /***************************************************************************
359 : * M-SEARCH replies
360 : * These are very similar to the multicast advertisements, with some
361 : * small changes in data content; and they are sent (UDP) to a specific
362 : * unicast address instead of multicast.
363 : * They are sent in response to a UDP M-SEARCH packet.
364 : **************************************************************************/
365 :
366 : /**
367 : * msearchreply_state_machine_stop - Stop M-SEARCH reply state machine
368 : * @a: Selected advertisement/reply state
369 : */
370 81 : void msearchreply_state_machine_stop(struct advertisement_state_machine *a)
371 : {
372 81 : wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH stop");
373 81 : dl_list_del(&a->list);
374 81 : os_free(a);
375 81 : }
376 :
377 :
378 602 : static void msearchreply_state_machine_handler(void *eloop_data,
379 : void *user_ctx)
380 : {
381 602 : struct advertisement_state_machine *a = user_ctx;
382 602 : struct upnp_wps_device_sm *sm = eloop_data;
383 : struct wpabuf *msg;
384 602 : int next_timeout_msec = 100;
385 602 : int next_timeout_sec = 0;
386 602 : int islast = 0;
387 :
388 : /*
389 : * Each response is sent twice (in case lost) w/ 100 msec delay
390 : * between; spec says no more than 3 times.
391 : * One pair for rootdevice, one pair for uuid, and a pair each for
392 : * each of the two urns.
393 : */
394 :
395 : /* TODO: should only send the requested response types */
396 :
397 602 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: M-SEARCH reply state=%d (%s:%d)",
398 : a->state, inet_ntoa(a->client.sin_addr),
399 602 : ntohs(a->client.sin_port));
400 602 : msg = next_advertisement(sm, a, &islast);
401 602 : if (msg == NULL)
402 63 : return;
403 :
404 : /*
405 : * Send it on the multicast socket to avoid having to set up another
406 : * socket.
407 : */
408 602 : if (sendto(sm->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0,
409 602 : (struct sockaddr *) &a->client, sizeof(a->client)) < 0) {
410 0 : wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply sendto "
411 : "errno %d (%s) for %s:%d",
412 0 : errno, strerror(errno),
413 : inet_ntoa(a->client.sin_addr),
414 0 : ntohs(a->client.sin_port));
415 : /* Ignore error and hope for the best */
416 : }
417 602 : wpabuf_free(msg);
418 602 : if (islast) {
419 63 : wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply done");
420 63 : msearchreply_state_machine_stop(a);
421 63 : return;
422 : }
423 539 : a->state++;
424 :
425 539 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: M-SEARCH reply in %d.%03d sec",
426 : next_timeout_sec, next_timeout_msec);
427 539 : eloop_register_timeout(next_timeout_sec, next_timeout_msec,
428 : msearchreply_state_machine_handler, sm, a);
429 : }
430 :
431 :
432 : /**
433 : * msearchreply_state_machine_start - Reply to M-SEARCH discovery request
434 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
435 : * @client: Client address
436 : * @mx: Maximum delay in seconds
437 : *
438 : * Use TTL of 4 (this was done when socket set up).
439 : * A response should be given in randomized portion of min(MX,120) seconds
440 : *
441 : * UPnP-arch-DeviceArchitecture, 1.2.3:
442 : * To be found, a device must send a UDP response to the source IP address and
443 : * port that sent the request to the multicast channel. Devices respond if the
444 : * ST header of the M-SEARCH request is "ssdp:all", "upnp:rootdevice", "uuid:"
445 : * followed by a UUID that exactly matches one advertised by the device.
446 : */
447 93 : static void msearchreply_state_machine_start(struct upnp_wps_device_sm *sm,
448 : struct sockaddr_in *client,
449 : int mx)
450 : {
451 : struct advertisement_state_machine *a;
452 : int next_timeout_sec;
453 : int next_timeout_msec;
454 : int replies;
455 :
456 93 : replies = dl_list_len(&sm->msearch_replies);
457 93 : wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply start (%d "
458 : "outstanding)", replies);
459 93 : if (replies >= MAX_MSEARCH) {
460 10 : wpa_printf(MSG_INFO, "WPS UPnP: Too many outstanding "
461 : "M-SEARCH replies");
462 10 : return;
463 : }
464 :
465 83 : a = os_zalloc(sizeof(*a));
466 83 : if (a == NULL)
467 1 : return;
468 82 : a->type = MSEARCH_REPLY;
469 82 : a->state = 0;
470 82 : os_memcpy(&a->client, client, sizeof(*client));
471 : /* Wait time depending on MX value */
472 82 : next_timeout_msec = (1000 * mx * (os_random() & 0xFF)) >> 8;
473 82 : next_timeout_sec = next_timeout_msec / 1000;
474 82 : next_timeout_msec = next_timeout_msec % 1000;
475 82 : if (eloop_register_timeout(next_timeout_sec, next_timeout_msec,
476 : msearchreply_state_machine_handler, sm,
477 : a)) {
478 : /* No way to recover (from malloc failure) */
479 1 : goto fail;
480 : }
481 : /* Remember for future cleanup */
482 81 : dl_list_add(&sm->msearch_replies, &a->list);
483 81 : return;
484 :
485 : fail:
486 1 : wpa_printf(MSG_INFO, "WPS UPnP: M-SEARCH reply failure!");
487 1 : eloop_cancel_timeout(msearchreply_state_machine_handler, sm, a);
488 1 : os_free(a);
489 : }
490 :
491 :
492 : /**
493 : * ssdp_parse_msearch - Process a received M-SEARCH
494 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
495 : * @client: Client address
496 : * @data: NULL terminated M-SEARCH message
497 : *
498 : * Given that we have received a header w/ M-SEARCH, act upon it
499 : *
500 : * Format of M-SEARCH (case insensitive!):
501 : *
502 : * First line must be:
503 : * M-SEARCH * HTTP/1.1
504 : * Other lines in arbitrary order:
505 : * HOST:239.255.255.250:1900
506 : * ST:<varies -- must match>
507 : * MAN:"ssdp:discover"
508 : * MX:<varies>
509 : *
510 : * It should be noted that when Microsoft Vista is still learning its IP
511 : * address, it sends out host lines like: HOST:[FF02::C]:1900
512 : */
513 106 : static void ssdp_parse_msearch(struct upnp_wps_device_sm *sm,
514 : struct sockaddr_in *client, const char *data)
515 : {
516 : #ifndef CONFIG_NO_STDOUT_DEBUG
517 106 : const char *start = data;
518 : #endif /* CONFIG_NO_STDOUT_DEBUG */
519 106 : int got_host = 0;
520 106 : int got_st = 0, st_match = 0;
521 106 : int got_man = 0;
522 106 : int got_mx = 0;
523 106 : int mx = 0;
524 :
525 : /*
526 : * Skip first line M-SEARCH * HTTP/1.1
527 : * (perhaps we should check remainder of the line for syntax)
528 : */
529 106 : data += line_length(data);
530 :
531 : /* Parse remaining lines */
532 624 : for (; *data != '\0'; data += line_length(data)) {
533 519 : if (token_eq(data, "host")) {
534 : /* The host line indicates who the packet
535 : * is addressed to... but do we really care?
536 : * Note that Microsoft sometimes does funny
537 : * stuff with the HOST: line.
538 : */
539 : #if 0 /* could be */
540 : data += token_length(data);
541 : data += word_separation_length(data);
542 : if (*data != ':')
543 : goto bad;
544 : data++;
545 : data += word_separation_length(data);
546 : /* UPNP_MULTICAST_ADDRESS */
547 : if (!str_starts(data, "239.255.255.250"))
548 : goto bad;
549 : data += os_strlen("239.255.255.250");
550 : if (*data == ':') {
551 : if (!str_starts(data, ":1900"))
552 : goto bad;
553 : }
554 : #endif /* could be */
555 104 : got_host = 1;
556 104 : continue;
557 415 : } else if (token_eq(data, "st")) {
558 : /* There are a number of forms; we look
559 : * for one that matches our case.
560 : */
561 103 : got_st = 1;
562 103 : data += token_length(data);
563 103 : data += word_separation_length(data);
564 103 : if (*data != ':')
565 1 : continue;
566 102 : data++;
567 102 : data += word_separation_length(data);
568 102 : if (str_starts(data, "ssdp:all")) {
569 1 : st_match = 1;
570 1 : continue;
571 : }
572 101 : if (str_starts(data, "upnp:rootdevice")) {
573 1 : st_match = 1;
574 1 : continue;
575 : }
576 100 : if (str_starts(data, "uuid:")) {
577 : char uuid_string[80];
578 : struct upnp_wps_device_interface *iface;
579 11 : iface = dl_list_first(
580 : &sm->interfaces,
581 : struct upnp_wps_device_interface,
582 : list);
583 11 : if (!iface)
584 0 : continue;
585 11 : data += os_strlen("uuid:");
586 11 : uuid_bin2str(iface->wps->uuid, uuid_string,
587 : sizeof(uuid_string));
588 11 : if (str_starts(data, uuid_string))
589 10 : st_match = 1;
590 11 : continue;
591 : }
592 : #if 0
593 : /* FIX: should we really reply to IGD string? */
594 : if (str_starts(data, "urn:schemas-upnp-org:device:"
595 : "InternetGatewayDevice:1")) {
596 : st_match = 1;
597 : continue;
598 : }
599 : #endif
600 89 : if (str_starts(data, "urn:schemas-wifialliance-org:"
601 : "service:WFAWLANConfig:1")) {
602 3 : st_match = 1;
603 3 : continue;
604 : }
605 86 : if (str_starts(data, "urn:schemas-wifialliance-org:"
606 : "device:WFADevice:1")) {
607 84 : st_match = 1;
608 84 : continue;
609 : }
610 2 : continue;
611 312 : } else if (token_eq(data, "man")) {
612 104 : data += token_length(data);
613 104 : data += word_separation_length(data);
614 104 : if (*data != ':')
615 1 : continue;
616 103 : data++;
617 103 : data += word_separation_length(data);
618 103 : if (!str_starts(data, "\"ssdp:discover\"")) {
619 1 : wpa_printf(MSG_DEBUG, "WPS UPnP: Unexpected "
620 : "M-SEARCH man-field");
621 1 : goto bad;
622 : }
623 102 : got_man = 1;
624 102 : continue;
625 208 : } else if (token_eq(data, "mx")) {
626 104 : data += token_length(data);
627 104 : data += word_separation_length(data);
628 104 : if (*data != ':')
629 1 : continue;
630 103 : data++;
631 103 : data += word_separation_length(data);
632 103 : mx = atol(data);
633 103 : got_mx = 1;
634 103 : continue;
635 : }
636 : /* ignore anything else */
637 : }
638 105 : if (!got_host || !got_st || !got_man || !got_mx || mx < 0) {
639 8 : wpa_printf(MSG_DEBUG, "WPS UPnP: Invalid M-SEARCH: %d %d %d "
640 : "%d mx=%d", got_host, got_st, got_man, got_mx, mx);
641 8 : goto bad;
642 : }
643 97 : if (!st_match) {
644 4 : wpa_printf(MSG_DEBUG, "WPS UPnP: Ignored M-SEARCH (no ST "
645 : "match)");
646 4 : return;
647 : }
648 93 : if (mx > 120)
649 1 : mx = 120; /* UPnP-arch-DeviceArchitecture, 1.2.3 */
650 93 : msearchreply_state_machine_start(sm, client, mx);
651 93 : return;
652 :
653 : bad:
654 9 : wpa_printf(MSG_INFO, "WPS UPnP: Failed to parse M-SEARCH");
655 9 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: M-SEARCH data:\n%s", start);
656 : }
657 :
658 :
659 : /* Listening for (UDP) discovery (M-SEARCH) packets */
660 :
661 : /**
662 : * ssdp_listener_stop - Stop SSDP listered
663 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
664 : *
665 : * This function stops the SSDP listener that was started by calling
666 : * ssdp_listener_start().
667 : */
668 39 : void ssdp_listener_stop(struct upnp_wps_device_sm *sm)
669 : {
670 39 : if (sm->ssdp_sd_registered) {
671 36 : eloop_unregister_sock(sm->ssdp_sd, EVENT_TYPE_READ);
672 36 : sm->ssdp_sd_registered = 0;
673 : }
674 :
675 39 : if (sm->ssdp_sd != -1) {
676 37 : close(sm->ssdp_sd);
677 37 : sm->ssdp_sd = -1;
678 : }
679 :
680 39 : eloop_cancel_timeout(msearchreply_state_machine_handler, sm,
681 : ELOOP_ALL_CTX);
682 39 : }
683 :
684 :
685 685 : static void ssdp_listener_handler(int sd, void *eloop_ctx, void *sock_ctx)
686 : {
687 685 : struct upnp_wps_device_sm *sm = sock_ctx;
688 : struct sockaddr_in addr; /* client address */
689 : socklen_t addr_len;
690 : int nread;
691 : char buf[MULTICAST_MAX_READ], *pos;
692 :
693 685 : addr_len = sizeof(addr);
694 685 : nread = recvfrom(sm->ssdp_sd, buf, sizeof(buf) - 1, 0,
695 : (struct sockaddr *) &addr, &addr_len);
696 685 : if (nread <= 0)
697 683 : return;
698 685 : buf[nread] = '\0'; /* need null termination for algorithm */
699 :
700 685 : if (str_starts(buf, "NOTIFY ")) {
701 : /*
702 : * Silently ignore NOTIFYs to avoid filling debug log with
703 : * unwanted messages.
704 : */
705 577 : return;
706 : }
707 :
708 108 : pos = os_strchr(buf, '\n');
709 108 : if (pos)
710 107 : *pos = '\0';
711 108 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: Received SSDP packet from %s:%d: "
712 108 : "%s", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port), buf);
713 108 : if (pos)
714 107 : *pos = '\n';
715 :
716 : /* Parse first line */
717 215 : if (os_strncasecmp(buf, "M-SEARCH", os_strlen("M-SEARCH")) == 0 &&
718 107 : !isgraph(buf[strlen("M-SEARCH")])) {
719 106 : ssdp_parse_msearch(sm, &addr, buf);
720 106 : return;
721 : }
722 :
723 : /* Ignore anything else */
724 : }
725 :
726 :
727 89 : int ssdp_listener_open(void)
728 : {
729 : struct sockaddr_in addr;
730 : struct ip_mreq mcast_addr;
731 89 : int on = 1;
732 : /* per UPnP spec, keep IP packet time to live (TTL) small */
733 89 : unsigned char ttl = 4;
734 : int sd;
735 :
736 89 : sd = socket(AF_INET, SOCK_DGRAM, 0);
737 178 : if (sd < 0 ||
738 178 : fcntl(sd, F_SETFL, O_NONBLOCK) != 0 ||
739 89 : setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)))
740 : goto fail;
741 89 : os_memset(&addr, 0, sizeof(addr));
742 89 : addr.sin_family = AF_INET;
743 89 : addr.sin_addr.s_addr = htonl(INADDR_ANY);
744 89 : addr.sin_port = htons(UPNP_MULTICAST_PORT);
745 89 : if (bind(sd, (struct sockaddr *) &addr, sizeof(addr)))
746 0 : goto fail;
747 89 : os_memset(&mcast_addr, 0, sizeof(mcast_addr));
748 89 : mcast_addr.imr_interface.s_addr = htonl(INADDR_ANY);
749 89 : mcast_addr.imr_multiaddr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
750 89 : if (setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
751 89 : (char *) &mcast_addr, sizeof(mcast_addr)) ||
752 89 : setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL,
753 : &ttl, sizeof(ttl)))
754 : goto fail;
755 :
756 89 : return sd;
757 :
758 : fail:
759 0 : if (sd >= 0)
760 0 : close(sd);
761 0 : return -1;
762 : }
763 :
764 :
765 : /**
766 : * ssdp_listener_start - Set up for receiving discovery (UDP) packets
767 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
768 : * Returns: 0 on success, -1 on failure
769 : *
770 : * The SSDP listener is stopped by calling ssdp_listener_stop().
771 : */
772 37 : int ssdp_listener_start(struct upnp_wps_device_sm *sm)
773 : {
774 37 : sm->ssdp_sd = ssdp_listener_open();
775 :
776 37 : if (eloop_register_sock(sm->ssdp_sd, EVENT_TYPE_READ,
777 : ssdp_listener_handler, NULL, sm))
778 1 : goto fail;
779 36 : sm->ssdp_sd_registered = 1;
780 36 : return 0;
781 :
782 : fail:
783 : /* Error */
784 1 : wpa_printf(MSG_ERROR, "WPS UPnP: ssdp_listener_start failed");
785 1 : ssdp_listener_stop(sm);
786 1 : return -1;
787 : }
788 :
789 :
790 : /**
791 : * add_ssdp_network - Add routing entry for SSDP
792 : * @net_if: Selected network interface name
793 : * Returns: 0 on success, -1 on failure
794 : *
795 : * This function assures that the multicast address will be properly
796 : * handled by Linux networking code (by a modification to routing tables).
797 : * This must be done per network interface. It really only needs to be done
798 : * once after booting up, but it does not hurt to call this more frequently
799 : * "to be safe".
800 : */
801 90 : int add_ssdp_network(const char *net_if)
802 : {
803 : #ifdef __linux__
804 90 : int ret = -1;
805 90 : int sock = -1;
806 : struct rtentry rt;
807 : struct sockaddr_in *sin;
808 :
809 90 : if (!net_if)
810 0 : goto fail;
811 :
812 90 : os_memset(&rt, 0, sizeof(rt));
813 90 : sock = socket(AF_INET, SOCK_DGRAM, 0);
814 90 : if (sock < 0)
815 0 : goto fail;
816 :
817 90 : rt.rt_dev = (char *) net_if;
818 90 : sin = aliasing_hide_typecast(&rt.rt_dst, struct sockaddr_in);
819 90 : sin->sin_family = AF_INET;
820 90 : sin->sin_port = 0;
821 90 : sin->sin_addr.s_addr = inet_addr(SSDP_TARGET);
822 90 : sin = aliasing_hide_typecast(&rt.rt_genmask, struct sockaddr_in);
823 90 : sin->sin_family = AF_INET;
824 90 : sin->sin_port = 0;
825 90 : sin->sin_addr.s_addr = inet_addr(SSDP_NETMASK);
826 90 : rt.rt_flags = RTF_UP;
827 90 : if (ioctl(sock, SIOCADDRT, &rt) < 0) {
828 84 : if (errno == EPERM) {
829 0 : wpa_printf(MSG_DEBUG, "add_ssdp_network: No "
830 : "permissions to add routing table entry");
831 : /* Continue to allow testing as non-root */
832 84 : } else if (errno != EEXIST) {
833 0 : wpa_printf(MSG_INFO, "add_ssdp_network() ioctl errno "
834 0 : "%d (%s)", errno, strerror(errno));
835 0 : goto fail;
836 : }
837 : }
838 :
839 90 : ret = 0;
840 :
841 : fail:
842 90 : if (sock >= 0)
843 90 : close(sock);
844 :
845 90 : return ret;
846 : #else /* __linux__ */
847 : return 0;
848 : #endif /* __linux__ */
849 : }
850 :
851 :
852 88 : int ssdp_open_multicast_sock(u32 ip_addr, const char *forced_ifname)
853 : {
854 : int sd;
855 : /* per UPnP-arch-DeviceArchitecture, 1. Discovery, keep IP packet
856 : * time to live (TTL) small */
857 88 : unsigned char ttl = 4;
858 :
859 88 : sd = socket(AF_INET, SOCK_DGRAM, 0);
860 88 : if (sd < 0)
861 0 : return -1;
862 :
863 88 : if (forced_ifname) {
864 : #ifdef __linux__
865 : struct ifreq req;
866 52 : os_memset(&req, 0, sizeof(req));
867 52 : os_strlcpy(req.ifr_name, forced_ifname, sizeof(req.ifr_name));
868 52 : if (setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, &req,
869 : sizeof(req)) < 0) {
870 0 : wpa_printf(MSG_INFO, "WPS UPnP: Failed to bind "
871 : "multicast socket to ifname %s: %s",
872 0 : forced_ifname, strerror(errno));
873 0 : close(sd);
874 0 : return -1;
875 : }
876 : #endif /* __linux__ */
877 : }
878 :
879 : #if 0 /* maybe ok if we sometimes block on writes */
880 : if (fcntl(sd, F_SETFL, O_NONBLOCK) != 0) {
881 : close(sd);
882 : return -1;
883 : }
884 : #endif
885 :
886 88 : if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_IF,
887 : &ip_addr, sizeof(ip_addr))) {
888 0 : wpa_printf(MSG_DEBUG, "WPS: setsockopt(IP_MULTICAST_IF) %x: "
889 0 : "%d (%s)", ip_addr, errno, strerror(errno));
890 0 : close(sd);
891 0 : return -1;
892 : }
893 88 : if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL,
894 : &ttl, sizeof(ttl))) {
895 0 : wpa_printf(MSG_DEBUG, "WPS: setsockopt(IP_MULTICAST_TTL): "
896 0 : "%d (%s)", errno, strerror(errno));
897 0 : close(sd);
898 0 : return -1;
899 : }
900 :
901 : #if 0 /* not needed, because we don't receive using multicast_sd */
902 : {
903 : struct ip_mreq mreq;
904 : mreq.imr_multiaddr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
905 : mreq.imr_interface.s_addr = ip_addr;
906 : wpa_printf(MSG_DEBUG, "WPS UPnP: Multicast addr 0x%x if addr "
907 : "0x%x",
908 : mreq.imr_multiaddr.s_addr,
909 : mreq.imr_interface.s_addr);
910 : if (setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq,
911 : sizeof(mreq))) {
912 : wpa_printf(MSG_ERROR,
913 : "WPS UPnP: setsockopt "
914 : "IP_ADD_MEMBERSHIP errno %d (%s)",
915 : errno, strerror(errno));
916 : close(sd);
917 : return -1;
918 : }
919 : }
920 : #endif /* not needed */
921 :
922 : /*
923 : * TODO: What about IP_MULTICAST_LOOP? It seems to be on by default?
924 : * which aids debugging I suppose but isn't really necessary?
925 : */
926 :
927 88 : return sd;
928 : }
929 :
930 :
931 : /**
932 : * ssdp_open_multicast - Open socket for sending multicast SSDP messages
933 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
934 : * Returns: 0 on success, -1 on failure
935 : */
936 36 : int ssdp_open_multicast(struct upnp_wps_device_sm *sm)
937 : {
938 36 : sm->multicast_sd = ssdp_open_multicast_sock(sm->ip_addr, NULL);
939 36 : if (sm->multicast_sd < 0)
940 0 : return -1;
941 36 : return 0;
942 : }
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