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Diffstat (limited to 'src/hello/hello.c')
-rw-r--r-- | src/hello/hello.c | 1271 |
1 files changed, 0 insertions, 1271 deletions
diff --git a/src/hello/hello.c b/src/hello/hello.c deleted file mode 100644 index 12b576ceb..000000000 --- a/src/hello/hello.c +++ /dev/null | |||
@@ -1,1271 +0,0 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2009, 2015 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file hello/hello.c | ||
23 | * @brief helper library for handling HELLOs | ||
24 | * @author Christian Grothoff | ||
25 | * @author Matthias Wachs | ||
26 | */ | ||
27 | #include "platform.h" | ||
28 | #include "gnunet_hello_lib.h" | ||
29 | #include "gnunet_protocols.h" | ||
30 | #include "gnunet_util_lib.h" | ||
31 | #include "gnunet_transport_plugin.h" | ||
32 | |||
33 | /** | ||
34 | * Context used for building our own URI. | ||
35 | */ | ||
36 | struct GNUNET_HELLO_ComposeUriContext | ||
37 | { | ||
38 | /** | ||
39 | * Final URI. | ||
40 | */ | ||
41 | char *uri; | ||
42 | |||
43 | /** | ||
44 | * Function for finding transport plugins by name. | ||
45 | */ | ||
46 | GNUNET_HELLO_TransportPluginsFind plugins_find; | ||
47 | }; | ||
48 | |||
49 | |||
50 | /** | ||
51 | * Context for #add_address_to_hello(). | ||
52 | */ | ||
53 | struct GNUNET_HELLO_ParseUriContext | ||
54 | { | ||
55 | /** | ||
56 | * Position in the URI with the next address to parse. | ||
57 | */ | ||
58 | const char *pos; | ||
59 | |||
60 | /** | ||
61 | * Set to #GNUNET_SYSERR to indicate parse errors. | ||
62 | */ | ||
63 | int ret; | ||
64 | |||
65 | /** | ||
66 | * Counter | ||
67 | */ | ||
68 | unsigned int counter_total; | ||
69 | |||
70 | /** | ||
71 | * Counter skipped addresses | ||
72 | */ | ||
73 | unsigned int counter_added; | ||
74 | |||
75 | /** | ||
76 | * Function for finding transport plugins by name. | ||
77 | */ | ||
78 | GNUNET_HELLO_TransportPluginsFind plugins_find; | ||
79 | }; | ||
80 | |||
81 | |||
82 | /** | ||
83 | * Return HELLO type | ||
84 | * | ||
85 | * @param h HELLO Message to test | ||
86 | * @return #GNUNET_YES for friend-only or #GNUNET_NO otherwise | ||
87 | */ | ||
88 | int | ||
89 | GNUNET_HELLO_is_friend_only (const struct GNUNET_HELLO_Message *h) | ||
90 | { | ||
91 | if (GNUNET_YES == ntohl (h->friend_only)) | ||
92 | return GNUNET_YES; | ||
93 | return GNUNET_NO; | ||
94 | } | ||
95 | |||
96 | |||
97 | /** | ||
98 | * Copy the given address information into | ||
99 | * the given buffer using the format of HELLOs. | ||
100 | * | ||
101 | * @param address the address | ||
102 | * @param expiration expiration for the @a address | ||
103 | * @param target where to copy the @a address | ||
104 | * @param max maximum number of bytes to copy to target | ||
105 | * @return number of bytes copied, 0 if | ||
106 | * the target buffer was not big enough. | ||
107 | */ | ||
108 | size_t | ||
109 | GNUNET_HELLO_add_address (const struct GNUNET_HELLO_Address *address, | ||
110 | struct GNUNET_TIME_Absolute expiration, | ||
111 | char *target, | ||
112 | size_t max) | ||
113 | { | ||
114 | uint16_t alen; | ||
115 | size_t slen; | ||
116 | struct GNUNET_TIME_AbsoluteNBO exp; | ||
117 | |||
118 | slen = strlen (address->transport_name) + 1; | ||
119 | if (slen + sizeof(uint16_t) + sizeof(struct GNUNET_TIME_AbsoluteNBO) | ||
120 | + address->address_length > max) | ||
121 | return 0; | ||
122 | exp = GNUNET_TIME_absolute_hton (expiration); | ||
123 | alen = htons ((uint16_t) address->address_length); | ||
124 | GNUNET_memcpy (target, address->transport_name, slen); | ||
125 | GNUNET_memcpy (&target[slen], &alen, sizeof(uint16_t)); | ||
126 | slen += sizeof(uint16_t); | ||
127 | GNUNET_memcpy (&target[slen], &exp, sizeof(struct GNUNET_TIME_AbsoluteNBO)); | ||
128 | slen += sizeof(struct GNUNET_TIME_AbsoluteNBO); | ||
129 | GNUNET_memcpy (&target[slen], address->address, address->address_length); | ||
130 | slen += address->address_length; | ||
131 | return slen; | ||
132 | } | ||
133 | |||
134 | |||
135 | /** | ||
136 | * Get the size of an address entry in a HELLO message. | ||
137 | * | ||
138 | * @param buf pointer to the start of the address entry | ||
139 | * @param max maximum size of the entry (end of @a buf) | ||
140 | * @param ralen set to the address length | ||
141 | * @return size of the entry, or 0 if @a max is not large enough | ||
142 | */ | ||
143 | static size_t | ||
144 | get_hello_address_size (const char *buf, | ||
145 | size_t max, | ||
146 | uint16_t *ralen) | ||
147 | { | ||
148 | const char *pos; | ||
149 | uint16_t alen; | ||
150 | size_t left; | ||
151 | size_t slen; | ||
152 | |||
153 | left = max; | ||
154 | pos = buf; | ||
155 | slen = 1; | ||
156 | while ((left > 0) && ('\0' != *pos)) | ||
157 | { | ||
158 | left--; | ||
159 | pos++; | ||
160 | slen++; | ||
161 | } | ||
162 | if (0 == left) | ||
163 | { | ||
164 | /* 0-termination not found */ | ||
165 | GNUNET_break_op (0); | ||
166 | return 0; | ||
167 | } | ||
168 | pos++; | ||
169 | if (left < sizeof(uint16_t) + sizeof(struct GNUNET_TIME_AbsoluteNBO)) | ||
170 | { | ||
171 | /* not enough space for addrlen */ | ||
172 | GNUNET_break_op (0); | ||
173 | return 0; | ||
174 | } | ||
175 | GNUNET_memcpy (&alen, pos, sizeof(uint16_t)); | ||
176 | alen = ntohs (alen); | ||
177 | *ralen = alen; | ||
178 | slen += alen + sizeof(uint16_t) + sizeof(struct GNUNET_TIME_AbsoluteNBO); | ||
179 | if (max < slen) | ||
180 | { | ||
181 | /* not enough space for addr */ | ||
182 | GNUNET_break_op (0); | ||
183 | return 0; | ||
184 | } | ||
185 | return slen; | ||
186 | } | ||
187 | |||
188 | |||
189 | /** | ||
190 | * Construct a HELLO message given the public key, | ||
191 | * expiration time and an iterator that spews the | ||
192 | * transport addresses. | ||
193 | * | ||
194 | * If friend only is set to #GNUNET_YES we create a FRIEND_HELLO which | ||
195 | * will not be gossiped to other peers. | ||
196 | * | ||
197 | * @param public_key public key to include in the HELLO | ||
198 | * @param addrgen callback to invoke to get addresses | ||
199 | * @param addrgen_cls closure for @a addrgen | ||
200 | * @param friend_only should the returned HELLO be only visible to friends? | ||
201 | * @return the hello message | ||
202 | */ | ||
203 | struct GNUNET_HELLO_Message * | ||
204 | GNUNET_HELLO_create (const struct GNUNET_CRYPTO_EddsaPublicKey *public_key, | ||
205 | GNUNET_HELLO_GenerateAddressListCallback addrgen, | ||
206 | void *addrgen_cls, | ||
207 | int friend_only) | ||
208 | { | ||
209 | char buffer[GNUNET_MAX_MESSAGE_SIZE - 1 - 256 | ||
210 | - sizeof(struct GNUNET_HELLO_Message)]; | ||
211 | size_t max; | ||
212 | size_t used; | ||
213 | size_t ret; | ||
214 | struct GNUNET_HELLO_Message *hello; | ||
215 | |||
216 | GNUNET_assert (NULL != public_key); | ||
217 | GNUNET_assert ((GNUNET_YES == friend_only) || | ||
218 | (GNUNET_NO == friend_only)); | ||
219 | max = sizeof(buffer); | ||
220 | used = 0; | ||
221 | if (NULL != addrgen) | ||
222 | { | ||
223 | while (GNUNET_SYSERR != (ret = addrgen (addrgen_cls, | ||
224 | max, | ||
225 | &buffer[used]))) | ||
226 | { | ||
227 | max -= ret; | ||
228 | used += ret; | ||
229 | } | ||
230 | } | ||
231 | hello = GNUNET_malloc (sizeof(struct GNUNET_HELLO_Message) + used); | ||
232 | hello->header.type = htons (GNUNET_MESSAGE_TYPE_HELLO); | ||
233 | hello->header.size = htons (sizeof(struct GNUNET_HELLO_Message) + used); | ||
234 | hello->friend_only = htonl (friend_only); | ||
235 | hello->publicKey = *public_key; | ||
236 | GNUNET_memcpy (&hello[1], | ||
237 | buffer, | ||
238 | used); | ||
239 | return hello; | ||
240 | } | ||
241 | |||
242 | |||
243 | /** | ||
244 | * Iterate over all of the addresses in the HELLO. | ||
245 | * | ||
246 | * @param msg HELLO to iterate over | ||
247 | * @param return_modified if a modified copy should be returned, | ||
248 | * otherwise NULL will be returned | ||
249 | * @param it iterator to call on each address | ||
250 | * @param it_cls closure for @a it | ||
251 | * @return modified HELLO message | ||
252 | */ | ||
253 | struct GNUNET_HELLO_Message * | ||
254 | GNUNET_HELLO_iterate_addresses (const struct GNUNET_HELLO_Message *msg, | ||
255 | int return_modified, | ||
256 | GNUNET_HELLO_AddressIterator it, | ||
257 | void *it_cls) | ||
258 | { | ||
259 | struct GNUNET_HELLO_Address address; | ||
260 | uint16_t msize; | ||
261 | struct GNUNET_HELLO_Message *ret; | ||
262 | const char *inptr; | ||
263 | size_t insize; | ||
264 | size_t esize; | ||
265 | size_t wpos; | ||
266 | char *woff; | ||
267 | uint16_t alen; | ||
268 | struct GNUNET_TIME_AbsoluteNBO expire; | ||
269 | int iret; | ||
270 | |||
271 | msize = GNUNET_HELLO_size (msg); | ||
272 | if ((msize < sizeof(struct GNUNET_HELLO_Message)) || | ||
273 | (ntohs (msg->header.type) != GNUNET_MESSAGE_TYPE_HELLO)) | ||
274 | { | ||
275 | GNUNET_break_op (0); | ||
276 | return NULL; | ||
277 | } | ||
278 | ret = NULL; | ||
279 | if (return_modified) | ||
280 | { | ||
281 | ret = GNUNET_malloc (msize); | ||
282 | GNUNET_memcpy (ret, | ||
283 | msg, | ||
284 | msize); | ||
285 | } | ||
286 | inptr = (const char *) &msg[1]; | ||
287 | insize = msize - sizeof(struct GNUNET_HELLO_Message); | ||
288 | wpos = 0; | ||
289 | woff = (NULL != ret) ? (char *) &ret[1] : NULL; | ||
290 | address.peer.public_key = msg->publicKey; | ||
291 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
292 | "HELLO has %u bytes of address data\n", | ||
293 | (unsigned int) insize); | ||
294 | |||
295 | while (insize > 0) | ||
296 | { | ||
297 | esize = get_hello_address_size (inptr, | ||
298 | insize, | ||
299 | &alen); | ||
300 | if (0 == esize) | ||
301 | { | ||
302 | GNUNET_break (0); | ||
303 | GNUNET_free (ret); | ||
304 | return NULL; | ||
305 | } | ||
306 | /* need GNUNET_memcpy() due to possibility of misalignment */ | ||
307 | GNUNET_memcpy (&expire, | ||
308 | &inptr[esize - alen - sizeof(struct | ||
309 | GNUNET_TIME_AbsoluteNBO)], | ||
310 | sizeof(struct GNUNET_TIME_AbsoluteNBO)); | ||
311 | address.address = &inptr[esize - alen]; | ||
312 | address.address_length = alen; | ||
313 | address.transport_name = inptr; | ||
314 | address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE; | ||
315 | iret = it (it_cls, | ||
316 | &address, | ||
317 | GNUNET_TIME_absolute_ntoh (expire)); | ||
318 | if (GNUNET_SYSERR == iret) | ||
319 | break; | ||
320 | if ((GNUNET_OK == iret) && | ||
321 | (NULL != ret)) | ||
322 | { | ||
323 | /* copy address over */ | ||
324 | GNUNET_memcpy (woff, | ||
325 | inptr, | ||
326 | esize); | ||
327 | woff += esize; | ||
328 | wpos += esize; | ||
329 | } | ||
330 | insize -= esize; | ||
331 | inptr += esize; | ||
332 | } | ||
333 | if (NULL != ret) | ||
334 | ret->header.size = ntohs (sizeof(struct GNUNET_HELLO_Message) + wpos); | ||
335 | return ret; | ||
336 | } | ||
337 | |||
338 | |||
339 | /** | ||
340 | * Closure for #get_match_exp(). | ||
341 | */ | ||
342 | struct ExpireContext | ||
343 | { | ||
344 | /** | ||
345 | * Address we are looking for. | ||
346 | */ | ||
347 | const struct GNUNET_HELLO_Address *address; | ||
348 | |||
349 | /** | ||
350 | * Set to #GNUNET_YES if we found the @e address. | ||
351 | */ | ||
352 | int found; | ||
353 | |||
354 | /** | ||
355 | * Set to the expiration of the match if @e found is #GNUNET_YES. | ||
356 | */ | ||
357 | struct GNUNET_TIME_Absolute expiration; | ||
358 | }; | ||
359 | |||
360 | |||
361 | /** | ||
362 | * Store the expiration time of an address that matches the template. | ||
363 | * | ||
364 | * @param cls the `struct ExpireContext` | ||
365 | * @param address address to match against the template | ||
366 | * @param expiration expiration time of @a address, to store in @a cls | ||
367 | * @return #GNUNET_SYSERR if we found a matching address, #GNUNET_OK otherwise | ||
368 | */ | ||
369 | static int | ||
370 | get_match_exp (void *cls, | ||
371 | const struct GNUNET_HELLO_Address *address, | ||
372 | struct GNUNET_TIME_Absolute expiration) | ||
373 | { | ||
374 | struct ExpireContext *ec = cls; | ||
375 | |||
376 | if (0 != GNUNET_HELLO_address_cmp (address, | ||
377 | ec->address)) | ||
378 | return GNUNET_OK; | ||
379 | ec->found = GNUNET_YES; | ||
380 | ec->expiration = expiration; | ||
381 | return GNUNET_SYSERR; /* done here */ | ||
382 | } | ||
383 | |||
384 | |||
385 | /** | ||
386 | * Context for a #GNUNET_HELLO_Merge operation. | ||
387 | */ | ||
388 | struct MergeContext | ||
389 | { | ||
390 | /** | ||
391 | * First HELLO we are merging. | ||
392 | */ | ||
393 | const struct GNUNET_HELLO_Message *h1; | ||
394 | |||
395 | /** | ||
396 | * Second HELLO we are merging. | ||
397 | */ | ||
398 | const struct GNUNET_HELLO_Message *h2; | ||
399 | |||
400 | /** | ||
401 | * Either @e h1 or @e h2, used when copying | ||
402 | * to compare against (so we only copy the | ||
403 | * most recent entry). | ||
404 | */ | ||
405 | const struct GNUNET_HELLO_Message *other; | ||
406 | |||
407 | /** | ||
408 | * Buffer where we copy to. | ||
409 | */ | ||
410 | char *buf; | ||
411 | |||
412 | /** | ||
413 | * Number of bytes allocated in @e buf | ||
414 | */ | ||
415 | size_t max; | ||
416 | |||
417 | /** | ||
418 | * Current (write) offset in @e buf. | ||
419 | */ | ||
420 | size_t ret; | ||
421 | |||
422 | /** | ||
423 | * Should we copy addresses with an identical value | ||
424 | * and expiration time in @e other, or do we only | ||
425 | * copy addresses with strictly later expiration times? | ||
426 | */ | ||
427 | int take_equal; | ||
428 | }; | ||
429 | |||
430 | |||
431 | /** | ||
432 | * Append the address @a address to the buffer from | ||
433 | * the merge context IF it is more recent than equivalent | ||
434 | * addresses in `other`. | ||
435 | * | ||
436 | * @param cls the `struct MergeContext` | ||
437 | * @param address the HELLO address we might copy | ||
438 | * @param expiration expiration time for @a address | ||
439 | * @return always #GNUNET_OK | ||
440 | */ | ||
441 | static int | ||
442 | copy_latest (void *cls, | ||
443 | const struct GNUNET_HELLO_Address *address, | ||
444 | struct GNUNET_TIME_Absolute expiration) | ||
445 | { | ||
446 | struct MergeContext *mc = cls; | ||
447 | struct ExpireContext ec; | ||
448 | |||
449 | ec.address = address; | ||
450 | ec.found = GNUNET_NO; | ||
451 | /* check if address exists in other */ | ||
452 | GNUNET_HELLO_iterate_addresses (mc->other, | ||
453 | GNUNET_NO, | ||
454 | &get_match_exp, | ||
455 | &ec); | ||
456 | if ((GNUNET_NO == ec.found) || | ||
457 | (ec.expiration.abs_value_us < expiration.abs_value_us) || | ||
458 | ((ec.expiration.abs_value_us == expiration.abs_value_us) && | ||
459 | (GNUNET_YES == mc->take_equal))) | ||
460 | { | ||
461 | /* copy address to buffer */ | ||
462 | mc->ret += | ||
463 | GNUNET_HELLO_add_address (address, | ||
464 | expiration, | ||
465 | &mc->buf[mc->ret], | ||
466 | mc->max - mc->ret); | ||
467 | } | ||
468 | return GNUNET_OK; | ||
469 | } | ||
470 | |||
471 | |||
472 | /** | ||
473 | * Function called to build the HELLO during | ||
474 | * #GNUNET_HELLO_merge() by merging addresses from | ||
475 | * two original HELLOs. | ||
476 | * | ||
477 | * @param cls the `struct MergeContext` | ||
478 | * @param max number of bytes we can write at most in @a buf | ||
479 | * @param buf where to copy the addresses | ||
480 | * @return #GNUNET_SYSERR to end iteration, otherwise number of bytes written to @a buf | ||
481 | */ | ||
482 | static ssize_t | ||
483 | merge_addr (void *cls, | ||
484 | size_t max, | ||
485 | void *buf) | ||
486 | { | ||
487 | struct MergeContext *mc = cls; | ||
488 | |||
489 | if (NULL == mc->h1) | ||
490 | return GNUNET_SYSERR; /* Stop iteration */ | ||
491 | mc->ret = 0; | ||
492 | mc->max = max; | ||
493 | mc->buf = buf; | ||
494 | mc->take_equal = GNUNET_NO; | ||
495 | mc->other = mc->h2; | ||
496 | /* copy addresses from h1, if strictly larger expiration than h2 */ | ||
497 | GNUNET_HELLO_iterate_addresses (mc->h1, | ||
498 | GNUNET_NO, | ||
499 | ©_latest, | ||
500 | mc); | ||
501 | mc->take_equal = GNUNET_YES; | ||
502 | mc->other = mc->h1; | ||
503 | /* copy addresses from h2, if larger or equal expiration than h1 */ | ||
504 | GNUNET_HELLO_iterate_addresses (mc->h2, | ||
505 | GNUNET_NO, | ||
506 | ©_latest, | ||
507 | mc); | ||
508 | /* set marker to stop iteration */ | ||
509 | mc->h1 = NULL; | ||
510 | return mc->ret; | ||
511 | } | ||
512 | |||
513 | |||
514 | /** | ||
515 | * Construct a HELLO message by merging the | ||
516 | * addresses in two existing HELLOs (which | ||
517 | * must be for the same peer). | ||
518 | * | ||
519 | * @param h1 first HELLO message | ||
520 | * @param h2 the second HELLO message | ||
521 | * @return the combined HELLO message | ||
522 | */ | ||
523 | struct GNUNET_HELLO_Message * | ||
524 | GNUNET_HELLO_merge (const struct GNUNET_HELLO_Message *h1, | ||
525 | const struct GNUNET_HELLO_Message *h2) | ||
526 | { | ||
527 | struct MergeContext mc = { h1, h2, NULL, NULL, 0, 0, 0 }; | ||
528 | int friend_only; | ||
529 | |||
530 | if (h1->friend_only != h2->friend_only) | ||
531 | friend_only = GNUNET_YES; /* One of the HELLOs is friend only */ | ||
532 | else | ||
533 | friend_only = ntohl (h1->friend_only); /* Both HELLO's have the same type */ | ||
534 | |||
535 | return GNUNET_HELLO_create (&h1->publicKey, | ||
536 | &merge_addr, | ||
537 | &mc, | ||
538 | friend_only); | ||
539 | } | ||
540 | |||
541 | |||
542 | /** | ||
543 | * Context used in #GNUNET_HELLO_iterate_new_addresses() to | ||
544 | * figure out which addresses are in fact 'new'. | ||
545 | */ | ||
546 | struct DeltaContext | ||
547 | { | ||
548 | /** | ||
549 | * We should ignore addresses that expire before this time. | ||
550 | */ | ||
551 | struct GNUNET_TIME_Absolute expiration_limit; | ||
552 | |||
553 | /** | ||
554 | * Function to call on addresses that are indeed new. | ||
555 | */ | ||
556 | GNUNET_HELLO_AddressIterator it; | ||
557 | |||
558 | /** | ||
559 | * Closure for @e it. | ||
560 | */ | ||
561 | void *it_cls; | ||
562 | |||
563 | /** | ||
564 | * HELLO with known addresses, addresses in this HELLO | ||
565 | * we must always ignore. | ||
566 | */ | ||
567 | const struct GNUNET_HELLO_Message *old_hello; | ||
568 | }; | ||
569 | |||
570 | |||
571 | /** | ||
572 | * Check if the given address is 'new', and if so, call | ||
573 | * the iterator. Compares the existing address against | ||
574 | * addresses in the context's `old_hello` and calls the | ||
575 | * iterator on those that are new (and not expired). | ||
576 | * | ||
577 | * @param cls the `struct DeltaContext` | ||
578 | * @param address an address to check whether it is new | ||
579 | * @param expiration expiration time for @a address | ||
580 | * @return #GNUNET_YES if the address is ignored, otherwise | ||
581 | * whatever the iterator returned. | ||
582 | */ | ||
583 | static int | ||
584 | delta_match (void *cls, | ||
585 | const struct GNUNET_HELLO_Address *address, | ||
586 | struct GNUNET_TIME_Absolute expiration) | ||
587 | { | ||
588 | struct DeltaContext *dc = cls; | ||
589 | int ret; | ||
590 | struct ExpireContext ec; | ||
591 | |||
592 | ec.address = address; | ||
593 | ec.found = GNUNET_NO; | ||
594 | GNUNET_HELLO_iterate_addresses (dc->old_hello, | ||
595 | GNUNET_NO, | ||
596 | &get_match_exp, | ||
597 | &ec); | ||
598 | if ((GNUNET_YES == ec.found) && | ||
599 | ((ec.expiration.abs_value_us > expiration.abs_value_us) || | ||
600 | (ec.expiration.abs_value_us >= dc->expiration_limit.abs_value_us))) | ||
601 | return GNUNET_YES; /* skip: found and boring */ | ||
602 | ret = dc->it (dc->it_cls, | ||
603 | address, | ||
604 | expiration); | ||
605 | return ret; | ||
606 | } | ||
607 | |||
608 | |||
609 | /** | ||
610 | * Iterate over addresses in @a new_hello that are NOT already present | ||
611 | * in @a old_hello. Note that if the address is present in @a old_hello | ||
612 | * but the expiration time in @a new_hello is more recent, the iterator | ||
613 | * is also called. | ||
614 | * | ||
615 | * @param new_hello a HELLO message | ||
616 | * @param old_hello a HELLO message | ||
617 | * @param expiration_limit ignore addresses in @a old_hello | ||
618 | * that expired before the given time stamp | ||
619 | * @param it iterator to call on each address | ||
620 | * @param it_cls closure for @a it | ||
621 | */ | ||
622 | void | ||
623 | GNUNET_HELLO_iterate_new_addresses (const struct | ||
624 | GNUNET_HELLO_Message *new_hello, | ||
625 | const struct | ||
626 | GNUNET_HELLO_Message *old_hello, | ||
627 | struct GNUNET_TIME_Absolute | ||
628 | expiration_limit, | ||
629 | GNUNET_HELLO_AddressIterator it, | ||
630 | void *it_cls) | ||
631 | { | ||
632 | struct DeltaContext dc; | ||
633 | |||
634 | dc.expiration_limit = expiration_limit; | ||
635 | dc.it = it; | ||
636 | dc.it_cls = it_cls; | ||
637 | dc.old_hello = old_hello; | ||
638 | GNUNET_assert (NULL == | ||
639 | GNUNET_HELLO_iterate_addresses (new_hello, | ||
640 | GNUNET_NO, | ||
641 | &delta_match, | ||
642 | &dc)); | ||
643 | } | ||
644 | |||
645 | |||
646 | /** | ||
647 | * Return the size of the given HELLO message. | ||
648 | * @param hello to inspect | ||
649 | * @return the size, 0 if HELLO is invalid | ||
650 | */ | ||
651 | uint16_t | ||
652 | GNUNET_HELLO_size (const struct GNUNET_HELLO_Message *hello) | ||
653 | { | ||
654 | uint16_t ret = ntohs (hello->header.size); | ||
655 | |||
656 | if ((ret < sizeof(struct GNUNET_HELLO_Message)) || | ||
657 | (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO)) | ||
658 | return 0; | ||
659 | return ret; | ||
660 | } | ||
661 | |||
662 | |||
663 | /** | ||
664 | * Get the peer identity from a HELLO message. | ||
665 | * | ||
666 | * @param hello the hello message | ||
667 | * @param peer where to store the peer's identity | ||
668 | * @return #GNUNET_SYSERR if the HELLO was malformed | ||
669 | */ | ||
670 | int | ||
671 | GNUNET_HELLO_get_id (const struct GNUNET_HELLO_Message *hello, | ||
672 | struct GNUNET_PeerIdentity *peer) | ||
673 | { | ||
674 | uint16_t ret = ntohs (hello->header.size); | ||
675 | |||
676 | if ((ret < sizeof(struct GNUNET_HELLO_Message)) || | ||
677 | (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO)) | ||
678 | return GNUNET_SYSERR; | ||
679 | peer->public_key = hello->publicKey; | ||
680 | return GNUNET_OK; | ||
681 | } | ||
682 | |||
683 | |||
684 | /** | ||
685 | * Get the header from a HELLO message, used so other code | ||
686 | * can correctly send HELLO messages. | ||
687 | * | ||
688 | * @param hello the hello message | ||
689 | * | ||
690 | * @return header or NULL if the HELLO was malformed | ||
691 | */ | ||
692 | struct GNUNET_MessageHeader * | ||
693 | GNUNET_HELLO_get_header (struct GNUNET_HELLO_Message *hello) | ||
694 | { | ||
695 | uint16_t ret = ntohs (hello->header.size); | ||
696 | |||
697 | if ((ret < sizeof(struct GNUNET_HELLO_Message)) || | ||
698 | (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO)) | ||
699 | return NULL; | ||
700 | |||
701 | return &hello->header; | ||
702 | } | ||
703 | |||
704 | |||
705 | /** | ||
706 | * Context used for comparing HELLOs in #GNUNET_HELLO_equals(). | ||
707 | */ | ||
708 | struct EqualsContext | ||
709 | { | ||
710 | /** | ||
711 | * Addresses that expired before this date are ignored for | ||
712 | * the comparison. | ||
713 | */ | ||
714 | struct GNUNET_TIME_Absolute expiration_limit; | ||
715 | |||
716 | /** | ||
717 | * Earliest expiration time for which we found a match | ||
718 | * with a difference in expiration times. | ||
719 | * At this time, the two HELLOs may start to diverge. | ||
720 | */ | ||
721 | struct GNUNET_TIME_Absolute result; | ||
722 | |||
723 | /** | ||
724 | * HELLO message to compare against. (First set to the second | ||
725 | * HELLO, then set to the first HELLO.) | ||
726 | */ | ||
727 | const struct GNUNET_HELLO_Message *ref; | ||
728 | |||
729 | /** | ||
730 | * Address we are currently looking for. | ||
731 | */ | ||
732 | const struct GNUNET_HELLO_Address *address; | ||
733 | |||
734 | /** | ||
735 | * Expiration time of @e address. | ||
736 | */ | ||
737 | struct GNUNET_TIME_Absolute expiration; | ||
738 | |||
739 | /** | ||
740 | * Did we find the address we were looking for? | ||
741 | */ | ||
742 | int found; | ||
743 | }; | ||
744 | |||
745 | |||
746 | /** | ||
747 | * Check if the given address matches the address we are currently | ||
748 | * looking for. If so, sets `found` to #GNUNET_YES and, if the | ||
749 | * expiration times for the two addresses differ, updates `result` to | ||
750 | * the minimum of our @a expiration and the existing value | ||
751 | * | ||
752 | * @param cls the `struct EqualsContext` | ||
753 | * @param address address from the reference HELLO | ||
754 | * @param expiration expiration time for @a address | ||
755 | * @return #GNUNET_YES if the address is expired or does not match | ||
756 | * #GNUNET_SYSERR if the address does match. | ||
757 | */ | ||
758 | static int | ||
759 | find_other_matching (void *cls, | ||
760 | const struct GNUNET_HELLO_Address *address, | ||
761 | struct GNUNET_TIME_Absolute expiration) | ||
762 | { | ||
763 | struct EqualsContext *ec = cls; | ||
764 | |||
765 | if (expiration.abs_value_us < ec->expiration_limit.abs_value_us) | ||
766 | return GNUNET_YES; | ||
767 | if (0 == GNUNET_HELLO_address_cmp (address, ec->address)) | ||
768 | { | ||
769 | ec->found = GNUNET_YES; | ||
770 | if (expiration.abs_value_us < ec->expiration.abs_value_us) | ||
771 | ec->result = GNUNET_TIME_absolute_min (expiration, | ||
772 | ec->result); | ||
773 | return GNUNET_SYSERR; | ||
774 | } | ||
775 | return GNUNET_YES; | ||
776 | } | ||
777 | |||
778 | |||
779 | /** | ||
780 | * Helper function for #GNUNET_HELLO_equals(). Checks | ||
781 | * if the given @a address exists also in the other HELLO; | ||
782 | * if not, the result time is set to zero and the iteration | ||
783 | * is aborted. | ||
784 | * | ||
785 | * @param cls the `struct EqualsContext` | ||
786 | * @param address address to locate | ||
787 | * @param expiration expiration time of the current address | ||
788 | * @return #GNUNET_OK if the address exists or is expired, | ||
789 | * #GNUNET_SYSERR if it was not found | ||
790 | */ | ||
791 | static int | ||
792 | find_matching (void *cls, | ||
793 | const struct GNUNET_HELLO_Address *address, | ||
794 | struct GNUNET_TIME_Absolute expiration) | ||
795 | { | ||
796 | struct EqualsContext *ec = cls; | ||
797 | |||
798 | if (expiration.abs_value_us < ec->expiration_limit.abs_value_us) | ||
799 | return GNUNET_OK; /* expired, we don't care */ | ||
800 | ec->address = address; | ||
801 | ec->expiration = expiration; | ||
802 | ec->found = GNUNET_NO; | ||
803 | GNUNET_HELLO_iterate_addresses (ec->ref, | ||
804 | GNUNET_NO, | ||
805 | &find_other_matching, | ||
806 | ec); | ||
807 | if (GNUNET_NO == ec->found) | ||
808 | { | ||
809 | /* not found, we differ *now* */ | ||
810 | ec->result = GNUNET_TIME_UNIT_ZERO_ABS; | ||
811 | return GNUNET_SYSERR; | ||
812 | } | ||
813 | return GNUNET_OK; | ||
814 | } | ||
815 | |||
816 | |||
817 | /** | ||
818 | * Test if two HELLO messages contain the same addresses. | ||
819 | * If they only differ in expiration time, the lowest | ||
820 | * expiration time larger than @a now where they differ | ||
821 | * is returned. | ||
822 | * | ||
823 | * @param h1 first HELLO message | ||
824 | * @param h2 the second HELLO message | ||
825 | * @param now time to use for deciding which addresses have | ||
826 | * expired and should not be considered at all | ||
827 | * @return absolute time forever if the two HELLOs are | ||
828 | * totally identical; smallest timestamp >= @a now if | ||
829 | * they only differ in timestamps; | ||
830 | * zero if the some addresses with expirations >= @a now | ||
831 | * do not match at all | ||
832 | */ | ||
833 | struct GNUNET_TIME_Absolute | ||
834 | GNUNET_HELLO_equals (const struct GNUNET_HELLO_Message *h1, | ||
835 | const struct GNUNET_HELLO_Message *h2, | ||
836 | struct GNUNET_TIME_Absolute now) | ||
837 | { | ||
838 | struct EqualsContext ec; | ||
839 | |||
840 | if (h1->header.type != h2->header.type) | ||
841 | return GNUNET_TIME_UNIT_ZERO_ABS; | ||
842 | if (0 != | ||
843 | GNUNET_memcmp (&h1->publicKey, | ||
844 | &h2->publicKey)) | ||
845 | return GNUNET_TIME_UNIT_ZERO_ABS; | ||
846 | ec.expiration_limit = now; | ||
847 | ec.result = GNUNET_TIME_UNIT_FOREVER_ABS; | ||
848 | ec.ref = h2; | ||
849 | GNUNET_HELLO_iterate_addresses (h1, | ||
850 | GNUNET_NO, | ||
851 | &find_matching, | ||
852 | &ec); | ||
853 | if (ec.result.abs_value_us == GNUNET_TIME_UNIT_ZERO.rel_value_us) | ||
854 | return ec.result; | ||
855 | ec.ref = h1; | ||
856 | GNUNET_HELLO_iterate_addresses (h2, | ||
857 | GNUNET_NO, | ||
858 | &find_matching, | ||
859 | &ec); | ||
860 | return ec.result; | ||
861 | } | ||
862 | |||
863 | |||
864 | /** | ||
865 | * Iterator to find the time when the last address will expire. | ||
866 | * Updates the maximum value stored in @a cls. | ||
867 | * | ||
868 | * @param cls where to store the max, a `struct GNUNET_TIME_Absolute` | ||
869 | * @param address an address (ignored) | ||
870 | * @param expiration expiration time for @a address | ||
871 | * @return #GNUNET_OK (always) | ||
872 | */ | ||
873 | static int | ||
874 | find_max_expire (void *cls, | ||
875 | const struct GNUNET_HELLO_Address *address, | ||
876 | struct GNUNET_TIME_Absolute expiration) | ||
877 | { | ||
878 | struct GNUNET_TIME_Absolute *max = cls; | ||
879 | |||
880 | *max = GNUNET_TIME_absolute_max (*max, expiration); | ||
881 | return GNUNET_OK; | ||
882 | } | ||
883 | |||
884 | |||
885 | /** | ||
886 | * When does the last address in the given HELLO expire? | ||
887 | * | ||
888 | * @param msg HELLO to inspect | ||
889 | * @return time the last address expires, 0 if there are no addresses in the HELLO | ||
890 | */ | ||
891 | struct GNUNET_TIME_Absolute | ||
892 | GNUNET_HELLO_get_last_expiration (const struct GNUNET_HELLO_Message *msg) | ||
893 | { | ||
894 | struct GNUNET_TIME_Absolute ret; | ||
895 | |||
896 | ret = GNUNET_TIME_UNIT_ZERO_ABS; | ||
897 | GNUNET_HELLO_iterate_addresses (msg, | ||
898 | GNUNET_NO, | ||
899 | &find_max_expire, | ||
900 | &ret); | ||
901 | return ret; | ||
902 | } | ||
903 | |||
904 | |||
905 | /** | ||
906 | * GNUnet URIs are of the general form "gnunet://MODULE/IDENTIFIER". | ||
907 | * The specific structure of "IDENTIFIER" depends on the module and | ||
908 | * maybe differentiated into additional subcategories if applicable. | ||
909 | * This module only deals with hello identifiers (MODULE = "hello"). | ||
910 | * <p> | ||
911 | * | ||
912 | * The concrete URI format is: | ||
913 | * | ||
914 | * "gnunet://hello/PEER[+YYYYMMDDHHMMSS+<TYPE>+<ADDRESS>]...". | ||
915 | * These URIs can be used to add a peer record to peerinfo service. | ||
916 | * PEER is the string representation of peer's public key. | ||
917 | * YYYYMMDDHHMMSS is the expiration date. | ||
918 | * TYPE is a transport type. | ||
919 | * ADDRESS is the address, its format depends upon the transport type. | ||
920 | * The concrete transport types and corresponding address formats are: | ||
921 | * | ||
922 | * <ul><li> | ||
923 | * | ||
924 | * <TCP|UDP>!IPADDRESS | ||
925 | * IPVDDRESS is either IPV4 .-delimited address in form of XXX.XXX.XXX.XXX:PPPPP | ||
926 | * or IPV6 :-delimited address with '[' and ']' (according to RFC2732): | ||
927 | * [XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX]:PPPPP | ||
928 | * PPPPP is the port number. May be 0. | ||
929 | * | ||
930 | * </li><li> | ||
931 | * | ||
932 | * [add SMTP, HTTP and other addresses here] | ||
933 | * | ||
934 | * </li></ul> | ||
935 | * | ||
936 | * The encoding for hexadecimal values is defined in the crypto_hash.c | ||
937 | * module in the gnunetutil library and discussed there. | ||
938 | * | ||
939 | * Examples: | ||
940 | * | ||
941 | * gnunet://hello/V8XXK9GAN5ZJFRFQP8MQX3D83BZTSBQVHKWWD0JPE63Z821906EG+20120302010059+TCP+192.168.0.1:2086+TCP+64.23.8.174:0 | ||
942 | * gnunet://hello/V8XXK9GAN5ZJFRFQP8MQX3D83BZTSBQVHKWWD0JPE63Z821906EG+20120302010059+TCP+[2001:db8:85a3:8d3:1319:8a2e:370:7348]:2086 | ||
943 | * | ||
944 | * <p> | ||
945 | */ | ||
946 | |||
947 | |||
948 | /** | ||
949 | * Function that is called on each address of this peer. | ||
950 | * Expands the corresponding URI string. | ||
951 | * | ||
952 | * @param cls the `struct GNUNET_HELLO_ComposeUriContext` | ||
953 | * @param address address to add | ||
954 | * @param expiration expiration time for the address | ||
955 | * @return #GNUNET_OK (continue iteration). | ||
956 | */ | ||
957 | static int | ||
958 | add_address_to_uri (void *cls, | ||
959 | const struct GNUNET_HELLO_Address *address, | ||
960 | struct GNUNET_TIME_Absolute expiration) | ||
961 | { | ||
962 | struct GNUNET_HELLO_ComposeUriContext *ctx = cls; | ||
963 | struct GNUNET_TRANSPORT_PluginFunctions *papi; | ||
964 | const char *addr; | ||
965 | char *ret; | ||
966 | char *addr_dup; | ||
967 | char *pos; | ||
968 | char tbuf[16] = ""; | ||
969 | char *client_str = "_client"; | ||
970 | struct tm *t; | ||
971 | time_t seconds; | ||
972 | |||
973 | papi = ctx->plugins_find (address->transport_name); | ||
974 | if (NULL == papi) | ||
975 | { | ||
976 | /* Not an error - we might just not have the right plugin. */ | ||
977 | return GNUNET_OK; | ||
978 | } | ||
979 | if (NULL == papi->address_to_string) | ||
980 | { | ||
981 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
982 | "URI conversion not implemented for plugin `%s'\n", | ||
983 | address->transport_name); | ||
984 | return GNUNET_OK; | ||
985 | } | ||
986 | addr = papi->address_to_string (papi->cls, | ||
987 | address->address, | ||
988 | address->address_length); | ||
989 | if ((NULL == addr) || | ||
990 | (0 == strlen (addr))) | ||
991 | return GNUNET_OK; | ||
992 | |||
993 | addr_dup = GNUNET_strdup (addr); | ||
994 | if (NULL != (pos = strstr (addr_dup, "_server"))) | ||
995 | GNUNET_memcpy (pos, | ||
996 | client_str, | ||
997 | strlen (client_str)); /* Replace all server addresses with client addresses */ | ||
998 | |||
999 | seconds = expiration.abs_value_us / 1000LL / 1000LL; | ||
1000 | t = gmtime (&seconds); | ||
1001 | |||
1002 | GNUNET_asprintf (&ret, | ||
1003 | "%s%c%s%c%s%c%s", | ||
1004 | ctx->uri, | ||
1005 | GNUNET_HELLO_URI_SEP, | ||
1006 | strftime (tbuf, | ||
1007 | sizeof(tbuf), | ||
1008 | "%Y%m%d%H%M%S", | ||
1009 | t) ? tbuf : "0", | ||
1010 | GNUNET_HELLO_URI_SEP, | ||
1011 | address->transport_name, | ||
1012 | GNUNET_HELLO_URI_SEP, | ||
1013 | addr_dup); | ||
1014 | GNUNET_free (addr_dup); | ||
1015 | GNUNET_free (ctx->uri); | ||
1016 | ctx->uri = ret; | ||
1017 | return GNUNET_OK; | ||
1018 | } | ||
1019 | |||
1020 | |||
1021 | /** | ||
1022 | * Compose a hello URI string from a hello message. | ||
1023 | * | ||
1024 | * @param hello Hello message | ||
1025 | * @param plugins_find Function to find transport plugins by name | ||
1026 | * @return Hello URI string | ||
1027 | */ | ||
1028 | char * | ||
1029 | GNUNET_HELLO_compose_uri (const struct GNUNET_HELLO_Message *hello, | ||
1030 | GNUNET_HELLO_TransportPluginsFind plugins_find) | ||
1031 | { | ||
1032 | struct GNUNET_HELLO_ComposeUriContext ctx; | ||
1033 | char *pkey; | ||
1034 | |||
1035 | ctx.plugins_find = plugins_find; | ||
1036 | pkey = GNUNET_CRYPTO_eddsa_public_key_to_string (&hello->publicKey); | ||
1037 | GNUNET_asprintf (&ctx.uri, | ||
1038 | "%s%s", | ||
1039 | (GNUNET_YES == GNUNET_HELLO_is_friend_only (hello)) | ||
1040 | ? GNUNET_FRIEND_HELLO_URI_PREFIX | ||
1041 | : GNUNET_HELLO_URI_PREFIX, | ||
1042 | pkey); | ||
1043 | GNUNET_free (pkey); | ||
1044 | GNUNET_HELLO_iterate_addresses (hello, | ||
1045 | GNUNET_NO, | ||
1046 | &add_address_to_uri, | ||
1047 | &ctx); | ||
1048 | return ctx.uri; | ||
1049 | } | ||
1050 | |||
1051 | |||
1052 | /* ************************* Parse HELLO URI ********************* */ | ||
1053 | |||
1054 | |||
1055 | /** | ||
1056 | * We're building a HELLO. Parse the next address from the | ||
1057 | * parsing context and append it. | ||
1058 | * | ||
1059 | * @param cls the `struct GNUNET_HELLO_ParseUriContext` | ||
1060 | * @param max number of bytes available for HELLO construction | ||
1061 | * @param buffer where to copy the next address (in binary format) | ||
1062 | * @return number of bytes added to buffer, #GNUNET_SYSERR on error | ||
1063 | */ | ||
1064 | static ssize_t | ||
1065 | add_address_to_hello (void *cls, | ||
1066 | size_t max, | ||
1067 | void *buffer) | ||
1068 | { | ||
1069 | struct GNUNET_HELLO_ParseUriContext *ctx = cls; | ||
1070 | const char *tname; | ||
1071 | const char *address; | ||
1072 | char *uri_address; | ||
1073 | const char *end; | ||
1074 | char *plugin_name; | ||
1075 | struct tm expiration_time; | ||
1076 | time_t expiration_seconds; | ||
1077 | struct GNUNET_TIME_Absolute expire; | ||
1078 | struct GNUNET_TRANSPORT_PluginFunctions *papi; | ||
1079 | void *addr; | ||
1080 | size_t addr_len; | ||
1081 | struct GNUNET_HELLO_Address haddr; | ||
1082 | ssize_t ret; | ||
1083 | |||
1084 | if (NULL == ctx->pos) | ||
1085 | return GNUNET_SYSERR; | ||
1086 | if (GNUNET_HELLO_URI_SEP != ctx->pos[0]) | ||
1087 | { | ||
1088 | ctx->ret = GNUNET_SYSERR; | ||
1089 | GNUNET_break (0); | ||
1090 | return GNUNET_SYSERR; | ||
1091 | } | ||
1092 | ctx->pos++; | ||
1093 | |||
1094 | if (('0' == ctx->pos[0]) && | ||
1095 | (GNUNET_HELLO_URI_SEP == ctx->pos[1])) | ||
1096 | { | ||
1097 | expire = GNUNET_TIME_UNIT_FOREVER_ABS; | ||
1098 | tname = ctx->pos + 1; | ||
1099 | } | ||
1100 | else | ||
1101 | { | ||
1102 | memset (&expiration_time, 0, sizeof(expiration_time)); | ||
1103 | tname = strptime (ctx->pos, | ||
1104 | "%Y%m%d%H%M%S", | ||
1105 | &expiration_time); | ||
1106 | if (NULL == tname) | ||
1107 | { | ||
1108 | ctx->ret = GNUNET_SYSERR; | ||
1109 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
1110 | _ ( | ||
1111 | "Failed to parse HELLO message: missing expiration time\n")); | ||
1112 | GNUNET_break (0); | ||
1113 | return GNUNET_SYSERR; | ||
1114 | } | ||
1115 | |||
1116 | expiration_seconds = mktime (&expiration_time); | ||
1117 | if (expiration_seconds == (time_t) -1) | ||
1118 | { | ||
1119 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
1120 | _ ( | ||
1121 | "Failed to parse HELLO message: invalid expiration time\n")); | ||
1122 | ctx->ret = GNUNET_SYSERR; | ||
1123 | GNUNET_break (0); | ||
1124 | return GNUNET_SYSERR; | ||
1125 | } | ||
1126 | expire.abs_value_us = expiration_seconds * 1000LL * 1000LL; | ||
1127 | } | ||
1128 | if (GNUNET_HELLO_URI_SEP != tname[0]) | ||
1129 | { | ||
1130 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
1131 | _ ("Failed to parse HELLO message: malformed\n")); | ||
1132 | ctx->ret = GNUNET_SYSERR; | ||
1133 | GNUNET_break (0); | ||
1134 | return GNUNET_SYSERR; | ||
1135 | } | ||
1136 | tname++; | ||
1137 | address = strchr (tname, | ||
1138 | (int) GNUNET_HELLO_URI_SEP); | ||
1139 | if (NULL == address) | ||
1140 | { | ||
1141 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
1142 | _ ( | ||
1143 | "Failed to parse HELLO message: missing transport plugin\n")); | ||
1144 | ctx->ret = GNUNET_SYSERR; | ||
1145 | GNUNET_break (0); | ||
1146 | return GNUNET_SYSERR; | ||
1147 | } | ||
1148 | address++; | ||
1149 | end = strchr (address, (int) GNUNET_HELLO_URI_SEP); | ||
1150 | ctx->pos = end; | ||
1151 | ctx->counter_total++; | ||
1152 | plugin_name = GNUNET_strndup (tname, address - (tname + 1)); | ||
1153 | papi = ctx->plugins_find (plugin_name); | ||
1154 | if (NULL == papi) | ||
1155 | { | ||
1156 | /* Not an error - we might just not have the right plugin. | ||
1157 | * Skip this part, advance to the next one and recurse. | ||
1158 | * But only if this is not the end of string. | ||
1159 | */ | ||
1160 | GNUNET_log (GNUNET_ERROR_TYPE_INFO, | ||
1161 | _ ("Plugin `%s' not found, skipping address\n"), | ||
1162 | plugin_name); | ||
1163 | GNUNET_free (plugin_name); | ||
1164 | return 0; | ||
1165 | } | ||
1166 | if (NULL == papi->string_to_address) | ||
1167 | { | ||
1168 | GNUNET_log (GNUNET_ERROR_TYPE_INFO, | ||
1169 | _ ("Plugin `%s' does not support URIs yet\n"), | ||
1170 | plugin_name); | ||
1171 | GNUNET_free (plugin_name); | ||
1172 | GNUNET_break (0); | ||
1173 | return 0; | ||
1174 | } | ||
1175 | uri_address = GNUNET_strndup (address, end - address); | ||
1176 | if (GNUNET_OK != | ||
1177 | papi->string_to_address (papi->cls, | ||
1178 | uri_address, | ||
1179 | strlen (uri_address) + 1, | ||
1180 | &addr, | ||
1181 | &addr_len)) | ||
1182 | { | ||
1183 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
1184 | _ ("Failed to parse `%s' as an address for plugin `%s'\n"), | ||
1185 | uri_address, | ||
1186 | plugin_name); | ||
1187 | GNUNET_free (plugin_name); | ||
1188 | GNUNET_free (uri_address); | ||
1189 | return 0; | ||
1190 | } | ||
1191 | GNUNET_free (uri_address); | ||
1192 | /* address.peer is unset - not used by add_address() */ | ||
1193 | haddr.address_length = addr_len; | ||
1194 | haddr.address = addr; | ||
1195 | haddr.transport_name = plugin_name; | ||
1196 | ret = GNUNET_HELLO_add_address (&haddr, | ||
1197 | expire, | ||
1198 | buffer, | ||
1199 | max); | ||
1200 | ctx->counter_added++; | ||
1201 | GNUNET_free (addr); | ||
1202 | GNUNET_free (plugin_name); | ||
1203 | return ret; | ||
1204 | } | ||
1205 | |||
1206 | |||
1207 | /** | ||
1208 | * Parse a hello URI string to a hello message. | ||
1209 | * | ||
1210 | * @param uri URI string to parse | ||
1211 | * @param pubkey Pointer to struct where public key is parsed | ||
1212 | * @param hello Pointer to struct where hello message is parsed | ||
1213 | * @param plugins_find Function to find transport plugins by name | ||
1214 | * @return #GNUNET_OK on success, #GNUNET_SYSERR if the URI was invalid, #GNUNET_NO on other errors | ||
1215 | */ | ||
1216 | int | ||
1217 | GNUNET_HELLO_parse_uri (const char *uri, | ||
1218 | struct GNUNET_CRYPTO_EddsaPublicKey *pubkey, | ||
1219 | struct GNUNET_HELLO_Message **hello, | ||
1220 | GNUNET_HELLO_TransportPluginsFind plugins_find) | ||
1221 | { | ||
1222 | const char *pks; | ||
1223 | const char *exc; | ||
1224 | int friend_only; | ||
1225 | struct GNUNET_HELLO_ParseUriContext ctx; | ||
1226 | |||
1227 | if (0 == strncmp (uri, | ||
1228 | GNUNET_HELLO_URI_PREFIX, | ||
1229 | strlen (GNUNET_HELLO_URI_PREFIX))) | ||
1230 | { | ||
1231 | pks = &uri[strlen (GNUNET_HELLO_URI_PREFIX)]; | ||
1232 | friend_only = GNUNET_NO; | ||
1233 | } | ||
1234 | else if (0 == strncmp (uri, | ||
1235 | GNUNET_FRIEND_HELLO_URI_PREFIX, | ||
1236 | strlen (GNUNET_FRIEND_HELLO_URI_PREFIX))) | ||
1237 | { | ||
1238 | pks = &uri[strlen (GNUNET_FRIEND_HELLO_URI_PREFIX)]; | ||
1239 | friend_only = GNUNET_YES; | ||
1240 | } | ||
1241 | else | ||
1242 | return GNUNET_SYSERR; | ||
1243 | exc = strchr (pks, GNUNET_HELLO_URI_SEP); | ||
1244 | |||
1245 | if (GNUNET_OK != | ||
1246 | GNUNET_STRINGS_string_to_data (pks, | ||
1247 | (NULL == exc) ? strlen (pks) : (exc - pks), | ||
1248 | (unsigned char *) pubkey, | ||
1249 | sizeof(*pubkey))) | ||
1250 | return GNUNET_SYSERR; | ||
1251 | |||
1252 | ctx.pos = exc; | ||
1253 | ctx.ret = GNUNET_OK; | ||
1254 | ctx.counter_total = 0; | ||
1255 | ctx.counter_added = 0; | ||
1256 | ctx.plugins_find = plugins_find; | ||
1257 | *hello = GNUNET_HELLO_create (pubkey, | ||
1258 | &add_address_to_hello, | ||
1259 | &ctx, | ||
1260 | friend_only); | ||
1261 | |||
1262 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
1263 | "HELLO URI contained %u addresses, added %u addresses\n", | ||
1264 | ctx.counter_total, | ||
1265 | ctx.counter_added); | ||
1266 | |||
1267 | return ctx.ret; | ||
1268 | } | ||
1269 | |||
1270 | |||
1271 | /* end of hello.c */ | ||