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 1160 : static int token_eq(const char *s1, const char *s2)
39 : {
40 : int c1;
41 : int c2;
42 1160 : int end1 = 0;
43 1160 : int end2 = 0;
44 : for (;;) {
45 2154 : c1 = *s1++;
46 2154 : c2 = *s2++;
47 2154 : if (isalpha(c1) && isupper(c1))
48 1465 : c1 = tolower(c1);
49 2154 : if (isalpha(c2) && isupper(c2))
50 0 : c2 = tolower(c2);
51 2154 : end1 = !(isalnum(c1) || c1 == '_' || c1 == '-');
52 2154 : end2 = !(isalnum(c2) || c2 == '_' || c2 == '-');
53 2154 : if (end1 || end2 || c1 != c2)
54 : break;
55 994 : }
56 1160 : return end1 && end2; /* reached end of both words? */
57 : }
58 :
59 :
60 : /* Return length of token (see above for definition of token) */
61 248 : static int token_length(const char *s)
62 : {
63 248 : const char *begin = s;
64 579 : for (;; s++) {
65 827 : int c = *s;
66 827 : int end = !(isalnum(c) || c == '_' || c == '-');
67 827 : if (end)
68 248 : break;
69 579 : }
70 248 : 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 : */
78 493 : static int word_separation_length(const char *s)
79 : {
80 493 : const char *begin = s;
81 250 : for (;; s++) {
82 743 : int c = *s;
83 743 : if (c == ' ' || c == '\t')
84 250 : continue;
85 493 : break;
86 250 : }
87 493 : return s - begin;
88 : }
89 :
90 :
91 : /* No. of chars through (including) end of line */
92 498 : static int line_length(const char *l)
93 : {
94 498 : const char *lp = l;
95 10376 : while (*lp && *lp != '\n')
96 9380 : lp++;
97 498 : if (*lp == '\n')
98 497 : lp++;
99 498 : return lp - l;
100 : }
101 :
102 :
103 819 : static int str_starts(const char *str, const char *start)
104 : {
105 819 : return os_strncmp(str, start, os_strlen(start)) == 0;
106 : }
107 :
108 :
109 : /***************************************************************************
110 : * Advertisements.
111 : * These are multicast to the world to tell them we are here.
112 : * The individual packets are spread out in time to limit loss,
113 : * and then after a much longer period of time the whole sequence
114 : * is repeated again (for NOTIFYs only).
115 : **************************************************************************/
116 :
117 : /**
118 : * next_advertisement - Build next message and advance the state machine
119 : * @a: Advertisement state
120 : * @islast: Buffer for indicating whether this is the last message (= 1)
121 : * Returns: The new message (caller is responsible for freeing this)
122 : *
123 : * Note: next_advertisement is shared code with msearchreply_* functions
124 : */
125 : static struct wpabuf *
126 872 : next_advertisement(struct upnp_wps_device_sm *sm,
127 : struct advertisement_state_machine *a, int *islast)
128 : {
129 : struct wpabuf *msg;
130 872 : char *NTString = "";
131 : char uuid_string[80];
132 : struct upnp_wps_device_interface *iface;
133 :
134 872 : *islast = 0;
135 872 : iface = dl_list_first(&sm->interfaces,
136 : struct upnp_wps_device_interface, list);
137 872 : if (!iface)
138 0 : return NULL;
139 872 : uuid_bin2str(iface->wps->uuid, uuid_string, sizeof(uuid_string));
140 872 : msg = wpabuf_alloc(800); /* more than big enough */
141 872 : if (msg == NULL)
142 0 : goto fail;
143 872 : switch (a->type) {
144 : case ADVERTISE_UP:
145 : case ADVERTISE_DOWN:
146 384 : NTString = "NT";
147 384 : wpabuf_put_str(msg, "NOTIFY * HTTP/1.1\r\n");
148 384 : wpabuf_printf(msg, "HOST: %s:%d\r\n",
149 : UPNP_MULTICAST_ADDRESS, UPNP_MULTICAST_PORT);
150 384 : wpabuf_printf(msg, "CACHE-CONTROL: max-age=%d\r\n",
151 : UPNP_CACHE_SEC);
152 384 : wpabuf_printf(msg, "NTS: %s\r\n",
153 384 : (a->type == ADVERTISE_UP ?
154 : "ssdp:alive" : "ssdp:byebye"));
155 384 : break;
156 : case MSEARCH_REPLY:
157 488 : NTString = "ST";
158 488 : wpabuf_put_str(msg, "HTTP/1.1 200 OK\r\n");
159 488 : wpabuf_printf(msg, "CACHE-CONTROL: max-age=%d\r\n",
160 : UPNP_CACHE_SEC);
161 :
162 488 : wpabuf_put_str(msg, "DATE: ");
163 488 : format_date(msg);
164 488 : wpabuf_put_str(msg, "\r\n");
165 :
166 488 : wpabuf_put_str(msg, "EXT:\r\n");
167 488 : break;
168 : }
169 :
170 872 : if (a->type != ADVERTISE_DOWN) {
171 : /* Where others may get our XML files from */
172 616 : wpabuf_printf(msg, "LOCATION: http://%s:%d/%s\r\n",
173 : sm->ip_addr_text, sm->web_port,
174 : UPNP_WPS_DEVICE_XML_FILE);
175 : }
176 :
177 : /* The SERVER line has three comma-separated fields:
178 : * operating system / version
179 : * upnp version
180 : * software package / version
181 : * However, only the UPnP version is really required, the
182 : * others can be place holders... for security reasons
183 : * it is better to NOT provide extra information.
184 : */
185 872 : wpabuf_put_str(msg, "SERVER: Unspecified, UPnP/1.0, Unspecified\r\n");
186 :
187 872 : switch (a->state / UPNP_ADVERTISE_REPEAT) {
188 : case 0:
189 218 : wpabuf_printf(msg, "%s: upnp:rootdevice\r\n", NTString);
190 218 : wpabuf_printf(msg, "USN: uuid:%s::upnp:rootdevice\r\n",
191 : uuid_string);
192 218 : break;
193 : case 1:
194 218 : wpabuf_printf(msg, "%s: uuid:%s\r\n", NTString, uuid_string);
195 218 : wpabuf_printf(msg, "USN: uuid:%s\r\n", uuid_string);
196 218 : break;
197 : case 2:
198 218 : wpabuf_printf(msg, "%s: urn:schemas-wifialliance-org:device:"
199 : "WFADevice:1\r\n", NTString);
200 218 : wpabuf_printf(msg, "USN: uuid:%s::urn:schemas-wifialliance-"
201 : "org:device:WFADevice:1\r\n", uuid_string);
202 218 : break;
203 : case 3:
204 218 : wpabuf_printf(msg, "%s: urn:schemas-wifialliance-org:service:"
205 : "WFAWLANConfig:1\r\n", NTString);
206 218 : wpabuf_printf(msg, "USN: uuid:%s::urn:schemas-wifialliance-"
207 : "org:service:WFAWLANConfig:1\r\n", uuid_string);
208 218 : break;
209 : }
210 872 : wpabuf_put_str(msg, "\r\n");
211 :
212 872 : if (a->state + 1 >= 4 * UPNP_ADVERTISE_REPEAT)
213 109 : *islast = 1;
214 :
215 872 : return msg;
216 :
217 : fail:
218 0 : wpabuf_free(msg);
219 0 : return NULL;
220 : }
221 :
222 :
223 : static void advertisement_state_machine_handler(void *eloop_data,
224 : void *user_ctx);
225 :
226 :
227 : /**
228 : * advertisement_state_machine_stop - Stop SSDP advertisements
229 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
230 : * @send_byebye: Send byebye advertisement messages immediately
231 : */
232 32 : void advertisement_state_machine_stop(struct upnp_wps_device_sm *sm,
233 : int send_byebye)
234 : {
235 32 : struct advertisement_state_machine *a = &sm->advertisement;
236 32 : int islast = 0;
237 : struct wpabuf *msg;
238 : struct sockaddr_in dest;
239 :
240 32 : eloop_cancel_timeout(advertisement_state_machine_handler, NULL, sm);
241 32 : if (!send_byebye || sm->multicast_sd < 0)
242 48 : return;
243 :
244 16 : a->type = ADVERTISE_DOWN;
245 16 : a->state = 0;
246 :
247 16 : os_memset(&dest, 0, sizeof(dest));
248 16 : dest.sin_family = AF_INET;
249 16 : dest.sin_addr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
250 16 : dest.sin_port = htons(UPNP_MULTICAST_PORT);
251 :
252 160 : while (!islast) {
253 128 : msg = next_advertisement(sm, a, &islast);
254 128 : if (msg == NULL)
255 0 : break;
256 128 : if (sendto(sm->multicast_sd, wpabuf_head(msg), wpabuf_len(msg),
257 : 0, (struct sockaddr *) &dest, sizeof(dest)) < 0) {
258 0 : wpa_printf(MSG_INFO, "WPS UPnP: Advertisement sendto "
259 0 : "failed: %d (%s)", errno, strerror(errno));
260 : }
261 128 : wpabuf_free(msg);
262 128 : a->state++;
263 : }
264 : }
265 :
266 :
267 256 : static void advertisement_state_machine_handler(void *eloop_data,
268 : void *user_ctx)
269 : {
270 256 : struct upnp_wps_device_sm *sm = user_ctx;
271 256 : struct advertisement_state_machine *a = &sm->advertisement;
272 : struct wpabuf *msg;
273 256 : int next_timeout_msec = 100;
274 256 : int next_timeout_sec = 0;
275 : struct sockaddr_in dest;
276 256 : int islast = 0;
277 :
278 : /*
279 : * Each is sent twice (in case lost) w/ 100 msec delay between;
280 : * spec says no more than 3 times.
281 : * One pair for rootdevice, one pair for uuid, and a pair each for
282 : * each of the two urns.
283 : * The entire sequence must be repeated before cache control timeout
284 : * (which is min 1800 seconds),
285 : * recommend random portion of half of the advertised cache control age
286 : * to ensure against loss... perhaps 1800/4 + rand*1800/4 ?
287 : * Delay random interval < 100 msec prior to initial sending.
288 : * TTL of 4
289 : */
290 :
291 256 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: Advertisement state=%d", a->state);
292 256 : msg = next_advertisement(sm, a, &islast);
293 256 : if (msg == NULL)
294 256 : return;
295 :
296 256 : os_memset(&dest, 0, sizeof(dest));
297 256 : dest.sin_family = AF_INET;
298 256 : dest.sin_addr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
299 256 : dest.sin_port = htons(UPNP_MULTICAST_PORT);
300 :
301 256 : if (sendto(sm->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0,
302 : (struct sockaddr *) &dest, sizeof(dest)) == -1) {
303 0 : wpa_printf(MSG_ERROR, "WPS UPnP: Advertisement sendto failed:"
304 0 : "%d (%s)", errno, strerror(errno));
305 0 : next_timeout_msec = 0;
306 0 : next_timeout_sec = 10; /* ... later */
307 256 : } else if (islast) {
308 32 : a->state = 0; /* wrap around */
309 32 : if (a->type == ADVERTISE_DOWN) {
310 16 : wpa_printf(MSG_DEBUG, "WPS UPnP: ADVERTISE_DOWN->UP");
311 16 : a->type = ADVERTISE_UP;
312 : /* do it all over again right away */
313 : } else {
314 : u16 r;
315 : /*
316 : * Start over again after a long timeout
317 : * (see notes above)
318 : */
319 16 : next_timeout_msec = 0;
320 16 : if (os_get_random((void *) &r, sizeof(r)) < 0)
321 0 : r = 32768;
322 16 : next_timeout_sec = UPNP_CACHE_SEC / 4 +
323 16 : (((UPNP_CACHE_SEC / 4) * r) >> 16);
324 16 : sm->advertise_count++;
325 16 : wpa_printf(MSG_DEBUG, "WPS UPnP: ADVERTISE_UP (#%u); "
326 : "next in %d sec",
327 : sm->advertise_count, next_timeout_sec);
328 : }
329 : } else {
330 224 : a->state++;
331 : }
332 :
333 256 : wpabuf_free(msg);
334 :
335 256 : eloop_register_timeout(next_timeout_sec, next_timeout_msec,
336 : advertisement_state_machine_handler, NULL, sm);
337 : }
338 :
339 :
340 : /**
341 : * advertisement_state_machine_start - Start SSDP advertisements
342 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
343 : * Returns: 0 on success, -1 on failure
344 : */
345 16 : int advertisement_state_machine_start(struct upnp_wps_device_sm *sm)
346 : {
347 16 : struct advertisement_state_machine *a = &sm->advertisement;
348 : int next_timeout_msec;
349 :
350 16 : advertisement_state_machine_stop(sm, 0);
351 :
352 : /*
353 : * Start out advertising down, this automatically switches
354 : * to advertising up which signals our restart.
355 : */
356 16 : a->type = ADVERTISE_DOWN;
357 16 : a->state = 0;
358 : /* (other fields not used here) */
359 :
360 : /* First timeout should be random interval < 100 msec */
361 16 : next_timeout_msec = (100 * (os_random() & 0xFF)) >> 8;
362 16 : return eloop_register_timeout(0, next_timeout_msec,
363 : advertisement_state_machine_handler,
364 : NULL, sm);
365 : }
366 :
367 :
368 : /***************************************************************************
369 : * M-SEARCH replies
370 : * These are very similar to the multicast advertisements, with some
371 : * small changes in data content; and they are sent (UDP) to a specific
372 : * unicast address instead of multicast.
373 : * They are sent in response to a UDP M-SEARCH packet.
374 : **************************************************************************/
375 :
376 : /**
377 : * msearchreply_state_machine_stop - Stop M-SEARCH reply state machine
378 : * @a: Selected advertisement/reply state
379 : */
380 62 : void msearchreply_state_machine_stop(struct advertisement_state_machine *a)
381 : {
382 62 : wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH stop");
383 62 : dl_list_del(&a->list);
384 62 : os_free(a);
385 62 : }
386 :
387 :
388 488 : static void msearchreply_state_machine_handler(void *eloop_data,
389 : void *user_ctx)
390 : {
391 488 : struct advertisement_state_machine *a = user_ctx;
392 488 : struct upnp_wps_device_sm *sm = eloop_data;
393 : struct wpabuf *msg;
394 488 : int next_timeout_msec = 100;
395 488 : int next_timeout_sec = 0;
396 488 : int islast = 0;
397 :
398 : /*
399 : * Each response is sent twice (in case lost) w/ 100 msec delay
400 : * between; spec says no more than 3 times.
401 : * One pair for rootdevice, one pair for uuid, and a pair each for
402 : * each of the two urns.
403 : */
404 :
405 : /* TODO: should only send the requested response types */
406 :
407 488 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: M-SEARCH reply state=%d (%s:%d)",
408 : a->state, inet_ntoa(a->client.sin_addr),
409 488 : ntohs(a->client.sin_port));
410 488 : msg = next_advertisement(sm, a, &islast);
411 488 : if (msg == NULL)
412 61 : return;
413 :
414 : /*
415 : * Send it on the multicast socket to avoid having to set up another
416 : * socket.
417 : */
418 488 : if (sendto(sm->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0,
419 488 : (struct sockaddr *) &a->client, sizeof(a->client)) < 0) {
420 0 : wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply sendto "
421 : "errno %d (%s) for %s:%d",
422 0 : errno, strerror(errno),
423 : inet_ntoa(a->client.sin_addr),
424 0 : ntohs(a->client.sin_port));
425 : /* Ignore error and hope for the best */
426 : }
427 488 : wpabuf_free(msg);
428 488 : if (islast) {
429 61 : wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply done");
430 61 : msearchreply_state_machine_stop(a);
431 61 : return;
432 : }
433 427 : a->state++;
434 :
435 427 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: M-SEARCH reply in %d.%03d sec",
436 : next_timeout_sec, next_timeout_msec);
437 427 : eloop_register_timeout(next_timeout_sec, next_timeout_msec,
438 : msearchreply_state_machine_handler, sm, a);
439 : }
440 :
441 :
442 : /**
443 : * msearchreply_state_machine_start - Reply to M-SEARCH discovery request
444 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
445 : * @client: Client address
446 : * @mx: Maximum delay in seconds
447 : *
448 : * Use TTL of 4 (this was done when socket set up).
449 : * A response should be given in randomized portion of min(MX,120) seconds
450 : *
451 : * UPnP-arch-DeviceArchitecture, 1.2.3:
452 : * To be found, a device must send a UDP response to the source IP address and
453 : * port that sent the request to the multicast channel. Devices respond if the
454 : * ST header of the M-SEARCH request is "ssdp:all", "upnp:rootdevice", "uuid:"
455 : * followed by a UUID that exactly matches one advertised by the device.
456 : */
457 72 : static void msearchreply_state_machine_start(struct upnp_wps_device_sm *sm,
458 : struct sockaddr_in *client,
459 : int mx)
460 : {
461 : struct advertisement_state_machine *a;
462 : int next_timeout_sec;
463 : int next_timeout_msec;
464 : int replies;
465 :
466 72 : replies = dl_list_len(&sm->msearch_replies);
467 72 : wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply start (%d "
468 : "outstanding)", replies);
469 72 : if (replies >= MAX_MSEARCH) {
470 10 : wpa_printf(MSG_INFO, "WPS UPnP: Too many outstanding "
471 : "M-SEARCH replies");
472 10 : return;
473 : }
474 :
475 62 : a = os_zalloc(sizeof(*a));
476 62 : if (a == NULL)
477 0 : return;
478 62 : a->type = MSEARCH_REPLY;
479 62 : a->state = 0;
480 62 : os_memcpy(&a->client, client, sizeof(*client));
481 : /* Wait time depending on MX value */
482 62 : next_timeout_msec = (1000 * mx * (os_random() & 0xFF)) >> 8;
483 62 : next_timeout_sec = next_timeout_msec / 1000;
484 62 : next_timeout_msec = next_timeout_msec % 1000;
485 62 : if (eloop_register_timeout(next_timeout_sec, next_timeout_msec,
486 : msearchreply_state_machine_handler, sm,
487 : a)) {
488 : /* No way to recover (from malloc failure) */
489 0 : goto fail;
490 : }
491 : /* Remember for future cleanup */
492 62 : dl_list_add(&sm->msearch_replies, &a->list);
493 62 : return;
494 :
495 : fail:
496 0 : wpa_printf(MSG_INFO, "WPS UPnP: M-SEARCH reply failure!");
497 0 : eloop_cancel_timeout(msearchreply_state_machine_handler, sm, a);
498 0 : os_free(a);
499 : }
500 :
501 :
502 : /**
503 : * ssdp_parse_msearch - Process a received M-SEARCH
504 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
505 : * @client: Client address
506 : * @data: NULL terminated M-SEARCH message
507 : *
508 : * Given that we have received a header w/ M-SEARCH, act upon it
509 : *
510 : * Format of M-SEARCH (case insensitive!):
511 : *
512 : * First line must be:
513 : * M-SEARCH * HTTP/1.1
514 : * Other lines in arbitrary order:
515 : * HOST:239.255.255.250:1900
516 : * ST:<varies -- must match>
517 : * MAN:"ssdp:discover"
518 : * MX:<varies>
519 : *
520 : * It should be noted that when Microsoft Vista is still learning its IP
521 : * address, it sends out host lines like: HOST:[FF02::C]:1900
522 : */
523 85 : static void ssdp_parse_msearch(struct upnp_wps_device_sm *sm,
524 : struct sockaddr_in *client, const char *data)
525 : {
526 : #ifndef CONFIG_NO_STDOUT_DEBUG
527 85 : const char *start = data;
528 : #endif /* CONFIG_NO_STDOUT_DEBUG */
529 85 : int got_host = 0;
530 85 : int got_st = 0, st_match = 0;
531 85 : int got_man = 0;
532 85 : int got_mx = 0;
533 85 : int mx = 0;
534 :
535 : /*
536 : * Skip first line M-SEARCH * HTTP/1.1
537 : * (perhaps we should check remainder of the line for syntax)
538 : */
539 85 : data += line_length(data);
540 :
541 : /* Parse remaining lines */
542 498 : for (; *data != '\0'; data += line_length(data)) {
543 414 : if (token_eq(data, "host")) {
544 : /* The host line indicates who the packet
545 : * is addressed to... but do we really care?
546 : * Note that Microsoft sometimes does funny
547 : * stuff with the HOST: line.
548 : */
549 : #if 0 /* could be */
550 : data += token_length(data);
551 : data += word_separation_length(data);
552 : if (*data != ':')
553 : goto bad;
554 : data++;
555 : data += word_separation_length(data);
556 : /* UPNP_MULTICAST_ADDRESS */
557 : if (!str_starts(data, "239.255.255.250"))
558 : goto bad;
559 : data += os_strlen("239.255.255.250");
560 : if (*data == ':') {
561 : if (!str_starts(data, ":1900"))
562 : goto bad;
563 : }
564 : #endif /* could be */
565 83 : got_host = 1;
566 83 : continue;
567 331 : } else if (token_eq(data, "st")) {
568 : /* There are a number of forms; we look
569 : * for one that matches our case.
570 : */
571 82 : got_st = 1;
572 82 : data += token_length(data);
573 82 : data += word_separation_length(data);
574 82 : if (*data != ':')
575 1 : continue;
576 81 : data++;
577 81 : data += word_separation_length(data);
578 81 : if (str_starts(data, "ssdp:all")) {
579 1 : st_match = 1;
580 1 : continue;
581 : }
582 80 : if (str_starts(data, "upnp:rootdevice")) {
583 1 : st_match = 1;
584 1 : continue;
585 : }
586 79 : if (str_starts(data, "uuid:")) {
587 : char uuid_string[80];
588 : struct upnp_wps_device_interface *iface;
589 4 : iface = dl_list_first(
590 : &sm->interfaces,
591 : struct upnp_wps_device_interface,
592 : list);
593 4 : if (!iface)
594 0 : continue;
595 4 : data += os_strlen("uuid:");
596 4 : uuid_bin2str(iface->wps->uuid, uuid_string,
597 : sizeof(uuid_string));
598 4 : if (str_starts(data, uuid_string))
599 3 : st_match = 1;
600 4 : continue;
601 : }
602 : #if 0
603 : /* FIX: should we really reply to IGD string? */
604 : if (str_starts(data, "urn:schemas-upnp-org:device:"
605 : "InternetGatewayDevice:1")) {
606 : st_match = 1;
607 : continue;
608 : }
609 : #endif
610 75 : if (str_starts(data, "urn:schemas-wifialliance-org:"
611 : "service:WFAWLANConfig:1")) {
612 1 : st_match = 1;
613 1 : continue;
614 : }
615 74 : if (str_starts(data, "urn:schemas-wifialliance-org:"
616 : "device:WFADevice:1")) {
617 72 : st_match = 1;
618 72 : continue;
619 : }
620 2 : continue;
621 249 : } else if (token_eq(data, "man")) {
622 83 : data += token_length(data);
623 83 : data += word_separation_length(data);
624 83 : if (*data != ':')
625 1 : continue;
626 82 : data++;
627 82 : data += word_separation_length(data);
628 82 : if (!str_starts(data, "\"ssdp:discover\"")) {
629 1 : wpa_printf(MSG_DEBUG, "WPS UPnP: Unexpected "
630 : "M-SEARCH man-field");
631 1 : goto bad;
632 : }
633 81 : got_man = 1;
634 81 : continue;
635 166 : } else if (token_eq(data, "mx")) {
636 83 : data += token_length(data);
637 83 : data += word_separation_length(data);
638 83 : if (*data != ':')
639 1 : continue;
640 82 : data++;
641 82 : data += word_separation_length(data);
642 82 : mx = atol(data);
643 82 : got_mx = 1;
644 82 : continue;
645 : }
646 : /* ignore anything else */
647 : }
648 84 : if (!got_host || !got_st || !got_man || !got_mx || mx < 0) {
649 8 : wpa_printf(MSG_DEBUG, "WPS UPnP: Invalid M-SEARCH: %d %d %d "
650 : "%d mx=%d", got_host, got_st, got_man, got_mx, mx);
651 8 : goto bad;
652 : }
653 76 : if (!st_match) {
654 4 : wpa_printf(MSG_DEBUG, "WPS UPnP: Ignored M-SEARCH (no ST "
655 : "match)");
656 4 : return;
657 : }
658 72 : if (mx > 120)
659 1 : mx = 120; /* UPnP-arch-DeviceArchitecture, 1.2.3 */
660 72 : msearchreply_state_machine_start(sm, client, mx);
661 72 : return;
662 :
663 : bad:
664 9 : wpa_printf(MSG_INFO, "WPS UPnP: Failed to parse M-SEARCH");
665 9 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: M-SEARCH data:\n%s", start);
666 : }
667 :
668 :
669 : /* Listening for (UDP) discovery (M-SEARCH) packets */
670 :
671 : /**
672 : * ssdp_listener_stop - Stop SSDP listered
673 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
674 : *
675 : * This function stops the SSDP listener that was started by calling
676 : * ssdp_listener_start().
677 : */
678 16 : void ssdp_listener_stop(struct upnp_wps_device_sm *sm)
679 : {
680 16 : if (sm->ssdp_sd_registered) {
681 16 : eloop_unregister_sock(sm->ssdp_sd, EVENT_TYPE_READ);
682 16 : sm->ssdp_sd_registered = 0;
683 : }
684 :
685 16 : if (sm->ssdp_sd != -1) {
686 16 : close(sm->ssdp_sd);
687 16 : sm->ssdp_sd = -1;
688 : }
689 :
690 16 : eloop_cancel_timeout(msearchreply_state_machine_handler, sm,
691 : ELOOP_ALL_CTX);
692 16 : }
693 :
694 :
695 344 : static void ssdp_listener_handler(int sd, void *eloop_ctx, void *sock_ctx)
696 : {
697 344 : struct upnp_wps_device_sm *sm = sock_ctx;
698 : struct sockaddr_in addr; /* client address */
699 : socklen_t addr_len;
700 : int nread;
701 : char buf[MULTICAST_MAX_READ], *pos;
702 :
703 344 : addr_len = sizeof(addr);
704 344 : nread = recvfrom(sm->ssdp_sd, buf, sizeof(buf) - 1, 0,
705 : (struct sockaddr *) &addr, &addr_len);
706 344 : if (nread <= 0)
707 342 : return;
708 344 : buf[nread] = '\0'; /* need null termination for algorithm */
709 :
710 344 : if (str_starts(buf, "NOTIFY ")) {
711 : /*
712 : * Silently ignore NOTIFYs to avoid filling debug log with
713 : * unwanted messages.
714 : */
715 257 : return;
716 : }
717 :
718 87 : pos = os_strchr(buf, '\n');
719 87 : if (pos)
720 86 : *pos = '\0';
721 87 : wpa_printf(MSG_MSGDUMP, "WPS UPnP: Received SSDP packet from %s:%d: "
722 87 : "%s", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port), buf);
723 87 : if (pos)
724 86 : *pos = '\n';
725 :
726 : /* Parse first line */
727 173 : if (os_strncasecmp(buf, "M-SEARCH", os_strlen("M-SEARCH")) == 0 &&
728 86 : !isgraph(buf[strlen("M-SEARCH")])) {
729 85 : ssdp_parse_msearch(sm, &addr, buf);
730 85 : return;
731 : }
732 :
733 : /* Ignore anything else */
734 : }
735 :
736 :
737 26 : int ssdp_listener_open(void)
738 : {
739 : struct sockaddr_in addr;
740 : struct ip_mreq mcast_addr;
741 26 : int on = 1;
742 : /* per UPnP spec, keep IP packet time to live (TTL) small */
743 26 : unsigned char ttl = 4;
744 : int sd;
745 :
746 26 : sd = socket(AF_INET, SOCK_DGRAM, 0);
747 26 : if (sd < 0)
748 0 : goto fail;
749 26 : if (fcntl(sd, F_SETFL, O_NONBLOCK) != 0)
750 0 : goto fail;
751 26 : if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)))
752 0 : goto fail;
753 26 : os_memset(&addr, 0, sizeof(addr));
754 26 : addr.sin_family = AF_INET;
755 26 : addr.sin_addr.s_addr = htonl(INADDR_ANY);
756 26 : addr.sin_port = htons(UPNP_MULTICAST_PORT);
757 26 : if (bind(sd, (struct sockaddr *) &addr, sizeof(addr)))
758 0 : goto fail;
759 26 : os_memset(&mcast_addr, 0, sizeof(mcast_addr));
760 26 : mcast_addr.imr_interface.s_addr = htonl(INADDR_ANY);
761 26 : mcast_addr.imr_multiaddr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
762 26 : if (setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
763 : (char *) &mcast_addr, sizeof(mcast_addr)))
764 0 : goto fail;
765 26 : if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL,
766 : &ttl, sizeof(ttl)))
767 0 : goto fail;
768 :
769 26 : return sd;
770 :
771 : fail:
772 0 : if (sd >= 0)
773 0 : close(sd);
774 0 : return -1;
775 : }
776 :
777 :
778 : /**
779 : * ssdp_listener_start - Set up for receiving discovery (UDP) packets
780 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
781 : * Returns: 0 on success, -1 on failure
782 : *
783 : * The SSDP listener is stopped by calling ssdp_listener_stop().
784 : */
785 16 : int ssdp_listener_start(struct upnp_wps_device_sm *sm)
786 : {
787 16 : sm->ssdp_sd = ssdp_listener_open();
788 :
789 16 : if (eloop_register_sock(sm->ssdp_sd, EVENT_TYPE_READ,
790 : ssdp_listener_handler, NULL, sm))
791 0 : goto fail;
792 16 : sm->ssdp_sd_registered = 1;
793 16 : return 0;
794 :
795 : fail:
796 : /* Error */
797 0 : wpa_printf(MSG_ERROR, "WPS UPnP: ssdp_listener_start failed");
798 0 : ssdp_listener_stop(sm);
799 0 : return -1;
800 : }
801 :
802 :
803 : /**
804 : * add_ssdp_network - Add routing entry for SSDP
805 : * @net_if: Selected network interface name
806 : * Returns: 0 on success, -1 on failure
807 : *
808 : * This function assures that the multicast address will be properly
809 : * handled by Linux networking code (by a modification to routing tables).
810 : * This must be done per network interface. It really only needs to be done
811 : * once after booting up, but it does not hurt to call this more frequently
812 : * "to be safe".
813 : */
814 26 : int add_ssdp_network(const char *net_if)
815 : {
816 : #ifdef __linux__
817 26 : int ret = -1;
818 26 : int sock = -1;
819 : struct rtentry rt;
820 : struct sockaddr_in *sin;
821 :
822 26 : if (!net_if)
823 0 : goto fail;
824 :
825 26 : os_memset(&rt, 0, sizeof(rt));
826 26 : sock = socket(AF_INET, SOCK_DGRAM, 0);
827 26 : if (sock < 0)
828 0 : goto fail;
829 :
830 26 : rt.rt_dev = (char *) net_if;
831 26 : sin = aliasing_hide_typecast(&rt.rt_dst, struct sockaddr_in);
832 26 : sin->sin_family = AF_INET;
833 26 : sin->sin_port = 0;
834 26 : sin->sin_addr.s_addr = inet_addr(SSDP_TARGET);
835 26 : sin = aliasing_hide_typecast(&rt.rt_genmask, struct sockaddr_in);
836 26 : sin->sin_family = AF_INET;
837 26 : sin->sin_port = 0;
838 26 : sin->sin_addr.s_addr = inet_addr(SSDP_NETMASK);
839 26 : rt.rt_flags = RTF_UP;
840 26 : if (ioctl(sock, SIOCADDRT, &rt) < 0) {
841 21 : if (errno == EPERM) {
842 0 : wpa_printf(MSG_DEBUG, "add_ssdp_network: No "
843 : "permissions to add routing table entry");
844 : /* Continue to allow testing as non-root */
845 21 : } else if (errno != EEXIST) {
846 0 : wpa_printf(MSG_INFO, "add_ssdp_network() ioctl errno "
847 0 : "%d (%s)", errno, strerror(errno));
848 0 : goto fail;
849 : }
850 : }
851 :
852 26 : ret = 0;
853 :
854 : fail:
855 26 : if (sock >= 0)
856 26 : close(sock);
857 :
858 26 : return ret;
859 : #else /* __linux__ */
860 : return 0;
861 : #endif /* __linux__ */
862 : }
863 :
864 :
865 26 : int ssdp_open_multicast_sock(u32 ip_addr, const char *forced_ifname)
866 : {
867 : int sd;
868 : /* per UPnP-arch-DeviceArchitecture, 1. Discovery, keep IP packet
869 : * time to live (TTL) small */
870 26 : unsigned char ttl = 4;
871 :
872 26 : sd = socket(AF_INET, SOCK_DGRAM, 0);
873 26 : if (sd < 0)
874 0 : return -1;
875 :
876 26 : if (forced_ifname) {
877 : #ifdef __linux__
878 : struct ifreq req;
879 10 : os_memset(&req, 0, sizeof(req));
880 10 : os_strlcpy(req.ifr_name, forced_ifname, sizeof(req.ifr_name));
881 10 : if (setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, &req,
882 : sizeof(req)) < 0) {
883 0 : wpa_printf(MSG_INFO, "WPS UPnP: Failed to bind "
884 : "multicast socket to ifname %s: %s",
885 0 : forced_ifname, strerror(errno));
886 0 : close(sd);
887 0 : return -1;
888 : }
889 : #endif /* __linux__ */
890 : }
891 :
892 : #if 0 /* maybe ok if we sometimes block on writes */
893 : if (fcntl(sd, F_SETFL, O_NONBLOCK) != 0) {
894 : close(sd);
895 : return -1;
896 : }
897 : #endif
898 :
899 26 : if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_IF,
900 : &ip_addr, sizeof(ip_addr))) {
901 0 : wpa_printf(MSG_DEBUG, "WPS: setsockopt(IP_MULTICAST_IF) %x: "
902 0 : "%d (%s)", ip_addr, errno, strerror(errno));
903 0 : close(sd);
904 0 : return -1;
905 : }
906 26 : if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL,
907 : &ttl, sizeof(ttl))) {
908 0 : wpa_printf(MSG_DEBUG, "WPS: setsockopt(IP_MULTICAST_TTL): "
909 0 : "%d (%s)", errno, strerror(errno));
910 0 : close(sd);
911 0 : return -1;
912 : }
913 :
914 : #if 0 /* not needed, because we don't receive using multicast_sd */
915 : {
916 : struct ip_mreq mreq;
917 : mreq.imr_multiaddr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
918 : mreq.imr_interface.s_addr = ip_addr;
919 : wpa_printf(MSG_DEBUG, "WPS UPnP: Multicast addr 0x%x if addr "
920 : "0x%x",
921 : mreq.imr_multiaddr.s_addr,
922 : mreq.imr_interface.s_addr);
923 : if (setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq,
924 : sizeof(mreq))) {
925 : wpa_printf(MSG_ERROR,
926 : "WPS UPnP: setsockopt "
927 : "IP_ADD_MEMBERSHIP errno %d (%s)",
928 : errno, strerror(errno));
929 : close(sd);
930 : return -1;
931 : }
932 : }
933 : #endif /* not needed */
934 :
935 : /*
936 : * TODO: What about IP_MULTICAST_LOOP? It seems to be on by default?
937 : * which aids debugging I suppose but isn't really necessary?
938 : */
939 :
940 26 : return sd;
941 : }
942 :
943 :
944 : /**
945 : * ssdp_open_multicast - Open socket for sending multicast SSDP messages
946 : * @sm: WPS UPnP state machine from upnp_wps_device_init()
947 : * Returns: 0 on success, -1 on failure
948 : */
949 16 : int ssdp_open_multicast(struct upnp_wps_device_sm *sm)
950 : {
951 16 : sm->multicast_sd = ssdp_open_multicast_sock(sm->ip_addr, NULL);
952 16 : if (sm->multicast_sd < 0)
953 0 : return -1;
954 16 : return 0;
955 : }
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