diff options
Diffstat (limited to 'src/dhtu/plugin_dhtu_ip.c')
-rw-r--r-- | src/dhtu/plugin_dhtu_ip.c | 1172 |
1 files changed, 0 insertions, 1172 deletions
diff --git a/src/dhtu/plugin_dhtu_ip.c b/src/dhtu/plugin_dhtu_ip.c deleted file mode 100644 index 612d2c119..000000000 --- a/src/dhtu/plugin_dhtu_ip.c +++ /dev/null | |||
@@ -1,1172 +0,0 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | Copyright (C) 2021, 2022 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 | * @author Christian Grothoff | ||
23 | * | ||
24 | * @file plugin_dhtu_ip.c | ||
25 | * @brief plain IP based DHT network underlay | ||
26 | */ | ||
27 | #include "platform.h" | ||
28 | #include "gnunet_dhtu_plugin.h" | ||
29 | |||
30 | /** | ||
31 | * How frequently should we re-scan our local interfaces for IPs? | ||
32 | */ | ||
33 | #define SCAN_FREQ GNUNET_TIME_UNIT_MINUTES | ||
34 | |||
35 | /** | ||
36 | * Maximum number of concurrently active destinations to support. | ||
37 | */ | ||
38 | #define MAX_DESTS 256 | ||
39 | |||
40 | |||
41 | /** | ||
42 | * Opaque handle that the underlay offers for our address to be used when | ||
43 | * sending messages to another peer. | ||
44 | */ | ||
45 | struct GNUNET_DHTU_Source | ||
46 | { | ||
47 | |||
48 | /** | ||
49 | * Kept in a DLL. | ||
50 | */ | ||
51 | struct GNUNET_DHTU_Source *next; | ||
52 | |||
53 | /** | ||
54 | * Kept in a DLL. | ||
55 | */ | ||
56 | struct GNUNET_DHTU_Source *prev; | ||
57 | |||
58 | /** | ||
59 | * Application context for this source. | ||
60 | */ | ||
61 | void *app_ctx; | ||
62 | |||
63 | /** | ||
64 | * Address in URL form ("ip+udp://$PID/$IP:$PORT") | ||
65 | */ | ||
66 | char *address; | ||
67 | |||
68 | /** | ||
69 | * My actual address. | ||
70 | */ | ||
71 | struct sockaddr_storage addr; | ||
72 | |||
73 | /** | ||
74 | * Number of bytes in @a addr. | ||
75 | */ | ||
76 | socklen_t addrlen; | ||
77 | |||
78 | /** | ||
79 | * Last generation this address was observed. | ||
80 | */ | ||
81 | unsigned int scan_generation; | ||
82 | |||
83 | }; | ||
84 | |||
85 | |||
86 | /** | ||
87 | * Opaque handle that the underlay offers for the target peer when sending | ||
88 | * messages to another peer. | ||
89 | */ | ||
90 | struct GNUNET_DHTU_Target | ||
91 | { | ||
92 | |||
93 | /** | ||
94 | * Kept in a DLL. | ||
95 | */ | ||
96 | struct GNUNET_DHTU_Target *next; | ||
97 | |||
98 | /** | ||
99 | * Kept in a DLL. | ||
100 | */ | ||
101 | struct GNUNET_DHTU_Target *prev; | ||
102 | |||
103 | /** | ||
104 | * Application context for this target. | ||
105 | */ | ||
106 | void *app_ctx; | ||
107 | |||
108 | /** | ||
109 | * Head of preferences expressed for this target. | ||
110 | */ | ||
111 | struct GNUNET_DHTU_PreferenceHandle *ph_head; | ||
112 | |||
113 | /** | ||
114 | * Tail of preferences expressed for this target. | ||
115 | */ | ||
116 | struct GNUNET_DHTU_PreferenceHandle *ph_tail; | ||
117 | |||
118 | /** | ||
119 | * Peer's identity. | ||
120 | */ | ||
121 | struct GNUNET_PeerIdentity pid; | ||
122 | |||
123 | /** | ||
124 | * Target IP address. | ||
125 | */ | ||
126 | struct sockaddr_storage addr; | ||
127 | |||
128 | /** | ||
129 | * Number of bytes in @a addr. | ||
130 | */ | ||
131 | socklen_t addrlen; | ||
132 | |||
133 | /** | ||
134 | * Preference counter, length of the @a ph_head DLL. | ||
135 | */ | ||
136 | unsigned int ph_count; | ||
137 | |||
138 | }; | ||
139 | |||
140 | /** | ||
141 | * Opaque handle expressing a preference of the DHT to | ||
142 | * keep a particular target connected. | ||
143 | */ | ||
144 | struct GNUNET_DHTU_PreferenceHandle | ||
145 | { | ||
146 | /** | ||
147 | * Kept in a DLL. | ||
148 | */ | ||
149 | struct GNUNET_DHTU_PreferenceHandle *next; | ||
150 | |||
151 | /** | ||
152 | * Kept in a DLL. | ||
153 | */ | ||
154 | struct GNUNET_DHTU_PreferenceHandle *prev; | ||
155 | |||
156 | /** | ||
157 | * Target a preference was expressed for. | ||
158 | */ | ||
159 | struct GNUNET_DHTU_Target *target; | ||
160 | }; | ||
161 | |||
162 | |||
163 | /** | ||
164 | * Closure for all plugin functions. | ||
165 | */ | ||
166 | struct Plugin | ||
167 | { | ||
168 | /** | ||
169 | * Callbacks into the DHT. | ||
170 | */ | ||
171 | struct GNUNET_DHTU_PluginEnvironment *env; | ||
172 | |||
173 | /** | ||
174 | * Head of sources where we receive traffic. | ||
175 | */ | ||
176 | struct GNUNET_DHTU_Source *src_head; | ||
177 | |||
178 | /** | ||
179 | * Tail of sources where we receive traffic. | ||
180 | */ | ||
181 | struct GNUNET_DHTU_Source *src_tail; | ||
182 | |||
183 | /** | ||
184 | * Head of destinations that are active. Sorted by | ||
185 | * last use, with latest used at the head. | ||
186 | */ | ||
187 | struct GNUNET_DHTU_Target *dst_head; | ||
188 | |||
189 | /** | ||
190 | * Tail of destinations that are active. | ||
191 | */ | ||
192 | struct GNUNET_DHTU_Target *dst_tail; | ||
193 | |||
194 | /** | ||
195 | * Map from hashes of sockaddrs to targets. | ||
196 | */ | ||
197 | struct GNUNET_CONTAINER_MultiHashMap *dsts; | ||
198 | |||
199 | /** | ||
200 | * Task that scans for IP address changes. | ||
201 | */ | ||
202 | struct GNUNET_SCHEDULER_Task *scan_task; | ||
203 | |||
204 | /** | ||
205 | * Task that reads incoming UDP packets. | ||
206 | */ | ||
207 | struct GNUNET_SCHEDULER_Task *read_task; | ||
208 | |||
209 | /** | ||
210 | * Port we bind to. | ||
211 | */ | ||
212 | char *port; | ||
213 | |||
214 | /** | ||
215 | * My UDP socket. | ||
216 | */ | ||
217 | struct GNUNET_NETWORK_Handle *sock; | ||
218 | |||
219 | /** | ||
220 | * My identity. | ||
221 | */ | ||
222 | struct GNUNET_PeerIdentity my_id; | ||
223 | |||
224 | /** | ||
225 | * How often have we scanned for IPs? | ||
226 | */ | ||
227 | unsigned int scan_generation; | ||
228 | |||
229 | /** | ||
230 | * Port as a 16-bit value. | ||
231 | */ | ||
232 | uint16_t port16; | ||
233 | }; | ||
234 | |||
235 | |||
236 | /** | ||
237 | * Create a target to which we may send traffic. | ||
238 | * | ||
239 | * @param plugin our plugin | ||
240 | * @param pid presumed identity of the target | ||
241 | * @param addr target address | ||
242 | * @param addrlen number of bytes in @a addr | ||
243 | * @return new target object | ||
244 | */ | ||
245 | static struct GNUNET_DHTU_Target * | ||
246 | create_target (struct Plugin *plugin, | ||
247 | const struct GNUNET_PeerIdentity *pid, | ||
248 | const struct sockaddr *addr, | ||
249 | socklen_t addrlen) | ||
250 | { | ||
251 | struct GNUNET_DHTU_Target *dst; | ||
252 | |||
253 | if (MAX_DESTS <= | ||
254 | GNUNET_CONTAINER_multihashmap_size (plugin->dsts)) | ||
255 | { | ||
256 | struct GNUNET_HashCode key; | ||
257 | |||
258 | dst = NULL; | ||
259 | for (struct GNUNET_DHTU_Target *pos = plugin->dst_head; | ||
260 | NULL != pos; | ||
261 | pos = pos->next) | ||
262 | { | ||
263 | /* >= here assures we remove oldest entries first */ | ||
264 | if ( (NULL == dst) || | ||
265 | (dst->ph_count >= pos->ph_count) ) | ||
266 | dst = pos; | ||
267 | } | ||
268 | GNUNET_assert (NULL != dst); | ||
269 | plugin->env->disconnect_cb (dst->app_ctx); | ||
270 | GNUNET_CRYPTO_hash (&dst->addr, | ||
271 | dst->addrlen, | ||
272 | &key); | ||
273 | GNUNET_assert (GNUNET_YES == | ||
274 | GNUNET_CONTAINER_multihashmap_remove (plugin->dsts, | ||
275 | &key, | ||
276 | dst)); | ||
277 | GNUNET_CONTAINER_DLL_remove (plugin->dst_head, | ||
278 | plugin->dst_tail, | ||
279 | dst); | ||
280 | GNUNET_assert (NULL == dst->ph_head); | ||
281 | GNUNET_free (dst); | ||
282 | } | ||
283 | dst = GNUNET_new (struct GNUNET_DHTU_Target); | ||
284 | dst->addrlen = addrlen; | ||
285 | dst->pid = *pid; | ||
286 | memcpy (&dst->addr, | ||
287 | addr, | ||
288 | addrlen); | ||
289 | GNUNET_CONTAINER_DLL_insert (plugin->dst_head, | ||
290 | plugin->dst_tail, | ||
291 | dst); | ||
292 | plugin->env->connect_cb (plugin->env->cls, | ||
293 | dst, | ||
294 | &dst->pid, | ||
295 | &dst->app_ctx); | ||
296 | return dst; | ||
297 | } | ||
298 | |||
299 | |||
300 | /** | ||
301 | * Find target matching @a addr. If none exists, | ||
302 | * create one! | ||
303 | * | ||
304 | * @param plugin the plugin handle | ||
305 | * @param pid presumed identity of the target | ||
306 | * @param src source target is from, or NULL if unknown | ||
307 | * @param addr socket address to find | ||
308 | * @param addrlen number of bytes in @a addr | ||
309 | * @return matching target object | ||
310 | */ | ||
311 | static struct GNUNET_DHTU_Target * | ||
312 | find_target (struct Plugin *plugin, | ||
313 | const struct GNUNET_PeerIdentity *pid, | ||
314 | const void *addr, | ||
315 | size_t addrlen) | ||
316 | { | ||
317 | struct GNUNET_HashCode key; | ||
318 | struct GNUNET_DHTU_Target *dst; | ||
319 | |||
320 | GNUNET_CRYPTO_hash (addr, | ||
321 | addrlen, | ||
322 | &key); | ||
323 | dst = GNUNET_CONTAINER_multihashmap_get (plugin->dsts, | ||
324 | &key); | ||
325 | if (NULL == dst) | ||
326 | { | ||
327 | dst = create_target (plugin, | ||
328 | pid, | ||
329 | (const struct sockaddr *) addr, | ||
330 | addrlen); | ||
331 | GNUNET_assert (GNUNET_YES == | ||
332 | GNUNET_CONTAINER_multihashmap_put ( | ||
333 | plugin->dsts, | ||
334 | &key, | ||
335 | dst, | ||
336 | GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)); | ||
337 | } | ||
338 | else | ||
339 | { | ||
340 | /* move to head of DLL */ | ||
341 | GNUNET_CONTAINER_DLL_remove (plugin->dst_head, | ||
342 | plugin->dst_tail, | ||
343 | dst); | ||
344 | GNUNET_CONTAINER_DLL_insert (plugin->dst_head, | ||
345 | plugin->dst_tail, | ||
346 | dst); | ||
347 | |||
348 | } | ||
349 | return dst; | ||
350 | } | ||
351 | |||
352 | |||
353 | /** | ||
354 | * Request creation of a session with a peer at the given @a address. | ||
355 | * | ||
356 | * @param cls closure (internal context for the plugin) | ||
357 | * @param pid identity of the target peer | ||
358 | * @param address target address to connect to | ||
359 | */ | ||
360 | static void | ||
361 | ip_try_connect (void *cls, | ||
362 | const struct GNUNET_PeerIdentity *pid, | ||
363 | const char *address) | ||
364 | { | ||
365 | struct Plugin *plugin = cls; | ||
366 | char *colon; | ||
367 | const char *port; | ||
368 | char *addr; | ||
369 | struct addrinfo hints = { | ||
370 | .ai_flags = AI_NUMERICHOST | AI_NUMERICSERV | ||
371 | }; | ||
372 | struct addrinfo *result = NULL; | ||
373 | |||
374 | if (0 != | ||
375 | strncmp (address, | ||
376 | "ip+", | ||
377 | strlen ("ip+"))) | ||
378 | return; | ||
379 | address += strlen ("ip+"); | ||
380 | if (0 != | ||
381 | strncmp (address, | ||
382 | "udp://", | ||
383 | strlen ("udp://"))) | ||
384 | return; | ||
385 | address += strlen ("udp://"); | ||
386 | addr = GNUNET_strdup (address); | ||
387 | colon = strchr (addr, ':'); | ||
388 | if (NULL == colon) | ||
389 | { | ||
390 | port = plugin->port; | ||
391 | } | ||
392 | else | ||
393 | { | ||
394 | *colon = '\0'; | ||
395 | port = colon + 1; | ||
396 | } | ||
397 | if (0 != | ||
398 | getaddrinfo (addr, | ||
399 | port, | ||
400 | &hints, | ||
401 | &result)) | ||
402 | { | ||
403 | GNUNET_break (0); | ||
404 | GNUNET_free (addr); | ||
405 | return; | ||
406 | } | ||
407 | GNUNET_free (addr); | ||
408 | (void) find_target (plugin, | ||
409 | pid, | ||
410 | result->ai_addr, | ||
411 | result->ai_addrlen); | ||
412 | freeaddrinfo (result); | ||
413 | } | ||
414 | |||
415 | |||
416 | /** | ||
417 | * Request underlay to keep the connection to @a target alive if possible. | ||
418 | * Hold may be called multiple times to express a strong preference to | ||
419 | * keep a connection, say because a @a target is in multiple tables. | ||
420 | * | ||
421 | * @param cls closure | ||
422 | * @param target connection to keep alive | ||
423 | */ | ||
424 | static struct GNUNET_DHTU_PreferenceHandle * | ||
425 | ip_hold (void *cls, | ||
426 | struct GNUNET_DHTU_Target *target) | ||
427 | { | ||
428 | struct GNUNET_DHTU_PreferenceHandle *ph; | ||
429 | |||
430 | ph = GNUNET_new (struct GNUNET_DHTU_PreferenceHandle); | ||
431 | ph->target = target; | ||
432 | GNUNET_CONTAINER_DLL_insert (target->ph_head, | ||
433 | target->ph_tail, | ||
434 | ph); | ||
435 | target->ph_count++; | ||
436 | return ph; | ||
437 | } | ||
438 | |||
439 | |||
440 | /** | ||
441 | * Do no long request underlay to keep the connection alive. | ||
442 | * | ||
443 | * @param cls closure | ||
444 | * @param target connection to keep alive | ||
445 | */ | ||
446 | static void | ||
447 | ip_drop (struct GNUNET_DHTU_PreferenceHandle *ph) | ||
448 | { | ||
449 | struct GNUNET_DHTU_Target *target = ph->target; | ||
450 | |||
451 | GNUNET_CONTAINER_DLL_remove (target->ph_head, | ||
452 | target->ph_tail, | ||
453 | ph); | ||
454 | target->ph_count--; | ||
455 | GNUNET_free (ph); | ||
456 | } | ||
457 | |||
458 | |||
459 | /** | ||
460 | * Send message to some other participant over the network. Note that | ||
461 | * sending is not guaranteeing that the other peer actually received the | ||
462 | * message. For any given @a target, the DHT must wait for the @a | ||
463 | * finished_cb to be called before calling send() again. | ||
464 | * | ||
465 | * @param cls closure (internal context for the plugin) | ||
466 | * @param target receiver identification | ||
467 | * @param msg message | ||
468 | * @param msg_size number of bytes in @a msg | ||
469 | * @param finished_cb function called once transmission is done | ||
470 | * (not called if @a target disconnects, then only the | ||
471 | * disconnect_cb is called). | ||
472 | * @param finished_cb_cls closure for @a finished_cb | ||
473 | */ | ||
474 | static void | ||
475 | ip_send (void *cls, | ||
476 | struct GNUNET_DHTU_Target *target, | ||
477 | const void *msg, | ||
478 | size_t msg_size, | ||
479 | GNUNET_SCHEDULER_TaskCallback finished_cb, | ||
480 | void *finished_cb_cls) | ||
481 | { | ||
482 | struct Plugin *plugin = cls; | ||
483 | char buf[sizeof (plugin->my_id) + msg_size]; | ||
484 | |||
485 | memcpy (buf, | ||
486 | &plugin->my_id, | ||
487 | sizeof (plugin->my_id)); | ||
488 | memcpy (&buf[sizeof (plugin->my_id)], | ||
489 | msg, | ||
490 | msg_size); | ||
491 | GNUNET_NETWORK_socket_sendto (plugin->sock, | ||
492 | buf, | ||
493 | sizeof (buf), | ||
494 | (const struct sockaddr *) &target->addr, | ||
495 | target->addrlen); | ||
496 | finished_cb (finished_cb_cls); | ||
497 | } | ||
498 | |||
499 | |||
500 | /** | ||
501 | * Create a new source on which we may be receiving traffic. | ||
502 | * | ||
503 | * @param plugin our plugin | ||
504 | * @param addr our address | ||
505 | * @param addrlen number of bytes in @a addr | ||
506 | * @return new source object | ||
507 | */ | ||
508 | static struct GNUNET_DHTU_Source * | ||
509 | create_source (struct Plugin *plugin, | ||
510 | const struct sockaddr *addr, | ||
511 | socklen_t addrlen) | ||
512 | { | ||
513 | struct GNUNET_DHTU_Source *src; | ||
514 | |||
515 | src = GNUNET_new (struct GNUNET_DHTU_Source); | ||
516 | src->addrlen = addrlen; | ||
517 | memcpy (&src->addr, | ||
518 | addr, | ||
519 | addrlen); | ||
520 | src->scan_generation = plugin->scan_generation; | ||
521 | switch (addr->sa_family) | ||
522 | { | ||
523 | case AF_INET: | ||
524 | { | ||
525 | const struct sockaddr_in *s4 = (const struct sockaddr_in *) addr; | ||
526 | char buf[INET_ADDRSTRLEN]; | ||
527 | |||
528 | GNUNET_assert (sizeof (struct sockaddr_in) == addrlen); | ||
529 | GNUNET_asprintf (&src->address, | ||
530 | "ip+udp://%s:%u", | ||
531 | inet_ntop (AF_INET, | ||
532 | &s4->sin_addr, | ||
533 | buf, | ||
534 | sizeof (buf)), | ||
535 | ntohs (s4->sin_port)); | ||
536 | } | ||
537 | break; | ||
538 | case AF_INET6: | ||
539 | { | ||
540 | const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) addr; | ||
541 | char buf[INET6_ADDRSTRLEN]; | ||
542 | |||
543 | GNUNET_assert (sizeof (struct sockaddr_in6) == addrlen); | ||
544 | GNUNET_asprintf (&src->address, | ||
545 | "ip+udp://[%s]:%u", | ||
546 | inet_ntop (AF_INET6, | ||
547 | &s6->sin6_addr, | ||
548 | buf, | ||
549 | sizeof (buf)), | ||
550 | ntohs (s6->sin6_port)); | ||
551 | } | ||
552 | break; | ||
553 | default: | ||
554 | GNUNET_break (0); | ||
555 | GNUNET_free (src); | ||
556 | return NULL; | ||
557 | } | ||
558 | GNUNET_CONTAINER_DLL_insert (plugin->src_head, | ||
559 | plugin->src_tail, | ||
560 | src); | ||
561 | plugin->env->address_add_cb (plugin->env->cls, | ||
562 | src->address, | ||
563 | src, | ||
564 | &src->app_ctx); | ||
565 | return src; | ||
566 | } | ||
567 | |||
568 | |||
569 | /** | ||
570 | * Compare two addresses excluding the ports for equality. Only compares IP | ||
571 | * address. Must only be called on AF_INET or AF_INET6 addresses. | ||
572 | * | ||
573 | * @param a1 address to compare | ||
574 | * @param a2 address to compare | ||
575 | * @param alen number of bytes in @a a1 and @a a2 | ||
576 | * @return 0 if @a a1 == @a a2. | ||
577 | */ | ||
578 | static int | ||
579 | addrcmp_np (const struct sockaddr *a1, | ||
580 | const struct sockaddr *a2, | ||
581 | size_t alen) | ||
582 | { | ||
583 | GNUNET_assert (a1->sa_family == a2->sa_family); | ||
584 | switch (a1->sa_family) | ||
585 | { | ||
586 | case AF_INET: | ||
587 | GNUNET_assert (sizeof (struct sockaddr_in) == alen); | ||
588 | { | ||
589 | const struct sockaddr_in *s1 = (const struct sockaddr_in *) a1; | ||
590 | const struct sockaddr_in *s2 = (const struct sockaddr_in *) a2; | ||
591 | |||
592 | if (s1->sin_addr.s_addr != s2->sin_addr.s_addr) | ||
593 | return 1; | ||
594 | break; | ||
595 | } | ||
596 | case AF_INET6: | ||
597 | GNUNET_assert (sizeof (struct sockaddr_in6) == alen); | ||
598 | { | ||
599 | const struct sockaddr_in6 *s1 = (const struct sockaddr_in6 *) a1; | ||
600 | const struct sockaddr_in6 *s2 = (const struct sockaddr_in6 *) a2; | ||
601 | |||
602 | if (0 != GNUNET_memcmp (&s1->sin6_addr, | ||
603 | &s2->sin6_addr)) | ||
604 | return 1; | ||
605 | break; | ||
606 | } | ||
607 | default: | ||
608 | GNUNET_assert (0); | ||
609 | } | ||
610 | return 0; | ||
611 | } | ||
612 | |||
613 | |||
614 | /** | ||
615 | * Compare two addresses for equality. Only | ||
616 | * compares IP address and port. Must only be | ||
617 | * called on AF_INET or AF_INET6 addresses. | ||
618 | * | ||
619 | * @param a1 address to compare | ||
620 | * @param a2 address to compare | ||
621 | * @param alen number of bytes in @a a1 and @a a2 | ||
622 | * @return 0 if @a a1 == @a a2. | ||
623 | */ | ||
624 | static int | ||
625 | addrcmp (const struct sockaddr *a1, | ||
626 | const struct sockaddr *a2, | ||
627 | size_t alen) | ||
628 | { | ||
629 | GNUNET_assert (a1->sa_family == a2->sa_family); | ||
630 | switch (a1->sa_family) | ||
631 | { | ||
632 | case AF_INET: | ||
633 | GNUNET_assert (sizeof (struct sockaddr_in) == alen); | ||
634 | { | ||
635 | const struct sockaddr_in *s1 = (const struct sockaddr_in *) a1; | ||
636 | const struct sockaddr_in *s2 = (const struct sockaddr_in *) a2; | ||
637 | |||
638 | if (s1->sin_port != s2->sin_port) | ||
639 | return 1; | ||
640 | if (s1->sin_addr.s_addr != s2->sin_addr.s_addr) | ||
641 | return 1; | ||
642 | break; | ||
643 | } | ||
644 | case AF_INET6: | ||
645 | GNUNET_assert (sizeof (struct sockaddr_in6) == alen); | ||
646 | { | ||
647 | const struct sockaddr_in6 *s1 = (const struct sockaddr_in6 *) a1; | ||
648 | const struct sockaddr_in6 *s2 = (const struct sockaddr_in6 *) a2; | ||
649 | |||
650 | if (s1->sin6_port != s2->sin6_port) | ||
651 | return 1; | ||
652 | if (0 != GNUNET_memcmp (&s1->sin6_addr, | ||
653 | &s2->sin6_addr)) | ||
654 | return 1; | ||
655 | break; | ||
656 | } | ||
657 | default: | ||
658 | GNUNET_assert (0); | ||
659 | } | ||
660 | return 0; | ||
661 | } | ||
662 | |||
663 | |||
664 | /** | ||
665 | * Callback function invoked for each interface found. | ||
666 | * | ||
667 | * @param cls closure | ||
668 | * @param name name of the interface (can be NULL for unknown) | ||
669 | * @param isDefault is this presumably the default interface | ||
670 | * @param addr address of this interface (can be NULL for unknown or unassigned) | ||
671 | * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned) | ||
672 | * @param netmask the network mask (can be NULL for unknown or unassigned) | ||
673 | * @param addrlen length of the address | ||
674 | * @return #GNUNET_OK to continue iteration, #GNUNET_SYSERR to abort | ||
675 | */ | ||
676 | static enum GNUNET_GenericReturnValue | ||
677 | process_ifcs (void *cls, | ||
678 | const char *name, | ||
679 | int isDefault, | ||
680 | const struct sockaddr *addr, | ||
681 | const struct sockaddr *broadcast_addr, | ||
682 | const struct sockaddr *netmask, | ||
683 | socklen_t addrlen) | ||
684 | { | ||
685 | struct Plugin *plugin = cls; | ||
686 | struct GNUNET_DHTU_Source *src; | ||
687 | |||
688 | for (src = plugin->src_head; | ||
689 | NULL != src; | ||
690 | src = src->next) | ||
691 | { | ||
692 | if ( (addrlen == src->addrlen) && | ||
693 | (0 == addrcmp_np (addr, | ||
694 | (const struct sockaddr *) &src->addr, | ||
695 | addrlen)) ) | ||
696 | { | ||
697 | src->scan_generation = plugin->scan_generation; | ||
698 | return GNUNET_OK; | ||
699 | } | ||
700 | } | ||
701 | switch (addr->sa_family) | ||
702 | { | ||
703 | case AF_INET: | ||
704 | { | ||
705 | struct sockaddr_in v4; | ||
706 | |||
707 | GNUNET_assert (sizeof(v4) == addrlen); | ||
708 | memcpy (&v4, | ||
709 | addr, | ||
710 | addrlen); | ||
711 | v4.sin_port = htons (plugin->port16); | ||
712 | (void) create_source (plugin, | ||
713 | (const struct sockaddr *) &v4, | ||
714 | sizeof (v4)); | ||
715 | break; | ||
716 | } | ||
717 | case AF_INET6: | ||
718 | { | ||
719 | struct sockaddr_in6 v6; | ||
720 | |||
721 | GNUNET_assert (sizeof(v6) == addrlen); | ||
722 | memcpy (&v6, | ||
723 | addr, | ||
724 | addrlen); | ||
725 | v6.sin6_port = htons (plugin->port16); | ||
726 | (void) create_source (plugin, | ||
727 | (const struct sockaddr *) &v6, | ||
728 | sizeof (v6)); | ||
729 | break; | ||
730 | } | ||
731 | } | ||
732 | return GNUNET_OK; | ||
733 | } | ||
734 | |||
735 | |||
736 | /** | ||
737 | * Scan network interfaces for IP address changes. | ||
738 | * | ||
739 | * @param cls a `struct Plugin` | ||
740 | */ | ||
741 | static void | ||
742 | scan (void *cls) | ||
743 | { | ||
744 | struct Plugin *plugin = cls; | ||
745 | struct GNUNET_DHTU_Source *next; | ||
746 | |||
747 | plugin->scan_generation++; | ||
748 | GNUNET_OS_network_interfaces_list (&process_ifcs, | ||
749 | plugin); | ||
750 | for (struct GNUNET_DHTU_Source *src = plugin->src_head; | ||
751 | NULL != src; | ||
752 | src = next) | ||
753 | { | ||
754 | next = src->next; | ||
755 | if (src->scan_generation >= plugin->scan_generation) | ||
756 | continue; | ||
757 | GNUNET_CONTAINER_DLL_remove (plugin->src_head, | ||
758 | plugin->src_tail, | ||
759 | src); | ||
760 | plugin->env->address_del_cb (src->app_ctx); | ||
761 | GNUNET_free (src->address); | ||
762 | GNUNET_free (src); | ||
763 | } | ||
764 | plugin->scan_task = GNUNET_SCHEDULER_add_delayed (SCAN_FREQ, | ||
765 | &scan, | ||
766 | plugin); | ||
767 | } | ||
768 | |||
769 | |||
770 | /** | ||
771 | * Find our source matching @a addr. If none exists, | ||
772 | * create one! | ||
773 | * | ||
774 | * @param plugin the plugin handle | ||
775 | * @param addr socket address to find | ||
776 | * @param addrlen number of bytes in @a addr | ||
777 | * @return matching source object | ||
778 | */ | ||
779 | static struct GNUNET_DHTU_Source * | ||
780 | find_source (struct Plugin *plugin, | ||
781 | const void *addr, | ||
782 | size_t addrlen) | ||
783 | { | ||
784 | for (struct GNUNET_DHTU_Source *src = plugin->src_head; | ||
785 | NULL != src; | ||
786 | src = src->next) | ||
787 | { | ||
788 | if ( (addrlen == src->addrlen) && | ||
789 | (0 == addrcmp (addr, | ||
790 | (const struct sockaddr *) &src->addr, | ||
791 | addrlen)) ) | ||
792 | return src; | ||
793 | } | ||
794 | |||
795 | return create_source (plugin, | ||
796 | (const struct sockaddr *) addr, | ||
797 | addrlen); | ||
798 | } | ||
799 | |||
800 | |||
801 | /** | ||
802 | * UDP socket is ready to receive. Read. | ||
803 | * | ||
804 | * @param cls our `struct Plugin *` | ||
805 | */ | ||
806 | static void | ||
807 | read_cb (void *cls) | ||
808 | { | ||
809 | struct Plugin *plugin = cls; | ||
810 | ssize_t ret; | ||
811 | const struct GNUNET_PeerIdentity *pid; | ||
812 | char buf[65536] GNUNET_ALIGN; | ||
813 | struct sockaddr_storage sa; | ||
814 | struct iovec iov = { | ||
815 | .iov_base = buf, | ||
816 | .iov_len = sizeof (buf) | ||
817 | }; | ||
818 | char ctl[128]; | ||
819 | struct msghdr mh = { | ||
820 | .msg_name = &sa, | ||
821 | .msg_namelen = sizeof (sa), | ||
822 | .msg_iov = &iov, | ||
823 | .msg_iovlen = 1, | ||
824 | .msg_control = ctl, | ||
825 | .msg_controllen = sizeof (ctl) | ||
826 | }; | ||
827 | struct GNUNET_DHTU_Target *dst = NULL; | ||
828 | struct GNUNET_DHTU_Source *src = NULL; | ||
829 | |||
830 | ret = recvmsg (GNUNET_NETWORK_get_fd (plugin->sock), | ||
831 | &mh, | ||
832 | MSG_DONTWAIT); | ||
833 | plugin->read_task = GNUNET_SCHEDULER_add_read_net ( | ||
834 | GNUNET_TIME_UNIT_FOREVER_REL, | ||
835 | plugin->sock, | ||
836 | &read_cb, | ||
837 | plugin); | ||
838 | if (ret < 0) | ||
839 | return; /* read failure, hopefully EAGAIN */ | ||
840 | if (ret < sizeof (*pid)) | ||
841 | { | ||
842 | GNUNET_break_op (0); | ||
843 | return; | ||
844 | } | ||
845 | /* find IP where we received message */ | ||
846 | for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mh); | ||
847 | NULL != cmsg; | ||
848 | cmsg = CMSG_NXTHDR (&mh, | ||
849 | cmsg)) | ||
850 | { | ||
851 | GNUNET_log (GNUNET_ERROR_TYPE_INFO, | ||
852 | "Got CMSG level %u (%d/%d), type %u (%d/%d)\n", | ||
853 | cmsg->cmsg_level, | ||
854 | (cmsg->cmsg_level == IPPROTO_IP), | ||
855 | (cmsg->cmsg_level == IPPROTO_IPV6), | ||
856 | cmsg->cmsg_type, | ||
857 | (cmsg->cmsg_type == IP_PKTINFO), | ||
858 | (cmsg->cmsg_type == IPV6_PKTINFO)); | ||
859 | if ( (cmsg->cmsg_level == IPPROTO_IP) && | ||
860 | (cmsg->cmsg_type == IP_PKTINFO) ) | ||
861 | { | ||
862 | if (CMSG_LEN (sizeof (struct in_pktinfo)) == | ||
863 | cmsg->cmsg_len) | ||
864 | { | ||
865 | struct in_pktinfo pi; | ||
866 | |||
867 | memcpy (&pi, | ||
868 | CMSG_DATA (cmsg), | ||
869 | sizeof (pi)); | ||
870 | { | ||
871 | struct sockaddr_in sa = { | ||
872 | .sin_family = AF_INET, | ||
873 | .sin_addr = pi.ipi_addr, | ||
874 | .sin_port = htons (plugin->port16) | ||
875 | }; | ||
876 | |||
877 | src = find_source (plugin, | ||
878 | &sa, | ||
879 | sizeof (sa)); | ||
880 | /* For sources we discovered by reading, | ||
881 | force the generation far into the future */ | ||
882 | src->scan_generation = plugin->scan_generation + 60; | ||
883 | } | ||
884 | break; | ||
885 | } | ||
886 | else | ||
887 | GNUNET_break (0); | ||
888 | } | ||
889 | if ( (cmsg->cmsg_level == IPPROTO_IPV6) && | ||
890 | (cmsg->cmsg_type == IPV6_PKTINFO) ) | ||
891 | { | ||
892 | if (CMSG_LEN (sizeof (struct in6_pktinfo)) == | ||
893 | cmsg->cmsg_len) | ||
894 | { | ||
895 | struct in6_pktinfo pi; | ||
896 | |||
897 | memcpy (&pi, | ||
898 | CMSG_DATA (cmsg), | ||
899 | sizeof (pi)); | ||
900 | { | ||
901 | struct sockaddr_in6 sa = { | ||
902 | .sin6_family = AF_INET6, | ||
903 | .sin6_addr = pi.ipi6_addr, | ||
904 | .sin6_port = htons (plugin->port16), | ||
905 | .sin6_scope_id = pi.ipi6_ifindex | ||
906 | }; | ||
907 | |||
908 | src = find_source (plugin, | ||
909 | &sa, | ||
910 | sizeof (sa)); | ||
911 | /* For sources we discovered by reading, | ||
912 | force the generation far into the future */ | ||
913 | src->scan_generation = plugin->scan_generation + 60; | ||
914 | break; | ||
915 | } | ||
916 | } | ||
917 | else | ||
918 | GNUNET_break (0); | ||
919 | } | ||
920 | } | ||
921 | if (NULL == src) | ||
922 | { | ||
923 | GNUNET_break (0); | ||
924 | return; | ||
925 | } | ||
926 | pid = (const struct GNUNET_PeerIdentity *) buf; | ||
927 | dst = find_target (plugin, | ||
928 | pid, | ||
929 | &sa, | ||
930 | mh.msg_namelen); | ||
931 | if (NULL == dst) | ||
932 | { | ||
933 | GNUNET_break (0); | ||
934 | return; | ||
935 | } | ||
936 | plugin->env->receive_cb (plugin->env->cls, | ||
937 | &dst->app_ctx, | ||
938 | &src->app_ctx, | ||
939 | &buf[sizeof(*pid)], | ||
940 | ret - sizeof (*pid)); | ||
941 | } | ||
942 | |||
943 | |||
944 | /** | ||
945 | * Entry point for the plugin. | ||
946 | * | ||
947 | * @param cls closure (the `struct GNUNET_DHTU_PluginEnvironment`) | ||
948 | * @return the plugin's API | ||
949 | */ | ||
950 | void * | ||
951 | libgnunet_plugin_dhtu_ip_init (void *cls) | ||
952 | { | ||
953 | struct GNUNET_DHTU_PluginEnvironment *env = cls; | ||
954 | struct GNUNET_DHTU_PluginFunctions *api; | ||
955 | struct Plugin *plugin; | ||
956 | char *port; | ||
957 | unsigned int nport; | ||
958 | int sock; | ||
959 | int af; | ||
960 | unsigned long long nse; | ||
961 | |||
962 | if (GNUNET_OK != | ||
963 | GNUNET_CONFIGURATION_get_value_number (env->cfg, | ||
964 | "DHTU-IP", | ||
965 | "NSE", | ||
966 | &nse)) | ||
967 | { | ||
968 | GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, | ||
969 | "DHTU-IP", | ||
970 | "NSE"); | ||
971 | return NULL; | ||
972 | } | ||
973 | if (GNUNET_OK != | ||
974 | GNUNET_CONFIGURATION_get_value_string (env->cfg, | ||
975 | "DHTU-IP", | ||
976 | "UDP_PORT", | ||
977 | &port)) | ||
978 | { | ||
979 | GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, | ||
980 | "DHTU-IP", | ||
981 | "UDP_PORT"); | ||
982 | return NULL; | ||
983 | } | ||
984 | { | ||
985 | char dummy; | ||
986 | |||
987 | if ( (1 != sscanf (port, | ||
988 | "%u%c", | ||
989 | &nport, | ||
990 | &dummy)) || | ||
991 | (nport > UINT16_MAX) ) | ||
992 | { | ||
993 | GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, | ||
994 | "DHTU-IP", | ||
995 | "UDP_PORT", | ||
996 | "must be number below 65536"); | ||
997 | GNUNET_free (port); | ||
998 | return NULL; | ||
999 | } | ||
1000 | } | ||
1001 | plugin = GNUNET_new (struct Plugin); | ||
1002 | plugin->env = env; | ||
1003 | plugin->port = port; | ||
1004 | plugin->port16 = (uint16_t) nport; | ||
1005 | if (GNUNET_OK != | ||
1006 | GNUNET_CRYPTO_get_peer_identity (env->cfg, | ||
1007 | &plugin->my_id)) | ||
1008 | { | ||
1009 | GNUNET_free (plugin); | ||
1010 | return NULL; | ||
1011 | } | ||
1012 | af = AF_INET6; | ||
1013 | sock = socket (af, | ||
1014 | SOCK_DGRAM, | ||
1015 | IPPROTO_UDP); | ||
1016 | if (-1 == sock) | ||
1017 | { | ||
1018 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, | ||
1019 | "socket"); | ||
1020 | GNUNET_free (plugin->port); | ||
1021 | GNUNET_free (plugin); | ||
1022 | return NULL; | ||
1023 | } | ||
1024 | switch (af) | ||
1025 | { | ||
1026 | case AF_INET: | ||
1027 | { | ||
1028 | int on = 1; | ||
1029 | |||
1030 | if (0 != | ||
1031 | setsockopt (sock, | ||
1032 | IPPROTO_IP, | ||
1033 | IP_PKTINFO, | ||
1034 | &on, | ||
1035 | sizeof (on))) | ||
1036 | { | ||
1037 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, | ||
1038 | "setsockopt"); | ||
1039 | } | ||
1040 | } | ||
1041 | { | ||
1042 | struct sockaddr_in sa = { | ||
1043 | .sin_family = AF_INET, | ||
1044 | .sin_port = htons ((uint16_t) nport) | ||
1045 | }; | ||
1046 | |||
1047 | if (0 != | ||
1048 | bind (sock, | ||
1049 | (const struct sockaddr *) &sa, | ||
1050 | sizeof (sa))) | ||
1051 | { | ||
1052 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, | ||
1053 | "socket"); | ||
1054 | GNUNET_break (0 == | ||
1055 | close (sock)); | ||
1056 | GNUNET_free (plugin->port); | ||
1057 | GNUNET_free (plugin); | ||
1058 | return NULL; | ||
1059 | } | ||
1060 | } | ||
1061 | break; | ||
1062 | case AF_INET6: | ||
1063 | { | ||
1064 | int on = 1; | ||
1065 | |||
1066 | if (0 != | ||
1067 | setsockopt (sock, | ||
1068 | IPPROTO_IPV6, | ||
1069 | IPV6_RECVPKTINFO, | ||
1070 | &on, | ||
1071 | sizeof (on))) | ||
1072 | { | ||
1073 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, | ||
1074 | "setsockopt"); | ||
1075 | } | ||
1076 | } | ||
1077 | { | ||
1078 | struct sockaddr_in6 sa = { | ||
1079 | .sin6_family = AF_INET6, | ||
1080 | .sin6_port = htons ((uint16_t) nport) | ||
1081 | }; | ||
1082 | |||
1083 | if (0 != | ||
1084 | bind (sock, | ||
1085 | (const struct sockaddr *) &sa, | ||
1086 | sizeof (sa))) | ||
1087 | { | ||
1088 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, | ||
1089 | "socket"); | ||
1090 | GNUNET_break (0 == | ||
1091 | close (sock)); | ||
1092 | GNUNET_free (plugin->port); | ||
1093 | GNUNET_free (plugin); | ||
1094 | return NULL; | ||
1095 | } | ||
1096 | } | ||
1097 | break; | ||
1098 | } | ||
1099 | plugin->dsts = GNUNET_CONTAINER_multihashmap_create (128, | ||
1100 | GNUNET_NO); | ||
1101 | plugin->sock = GNUNET_NETWORK_socket_box_native (sock); | ||
1102 | plugin->read_task = GNUNET_SCHEDULER_add_read_net ( | ||
1103 | GNUNET_TIME_UNIT_FOREVER_REL, | ||
1104 | plugin->sock, | ||
1105 | &read_cb, | ||
1106 | plugin); | ||
1107 | env->network_size_cb (env->cls, | ||
1108 | GNUNET_TIME_UNIT_ZERO_ABS, | ||
1109 | log (nse) / log (2), | ||
1110 | -1.0 /* stddev */); | ||
1111 | plugin->scan_task = GNUNET_SCHEDULER_add_now (&scan, | ||
1112 | plugin); | ||
1113 | api = GNUNET_new (struct GNUNET_DHTU_PluginFunctions); | ||
1114 | api->cls = plugin; | ||
1115 | api->try_connect = &ip_try_connect; | ||
1116 | api->hold = &ip_hold; | ||
1117 | api->drop = &ip_drop; | ||
1118 | api->send = &ip_send; | ||
1119 | return api; | ||
1120 | } | ||
1121 | |||
1122 | |||
1123 | /** | ||
1124 | * Exit point from the plugin. | ||
1125 | * | ||
1126 | * @param cls closure (our `struct Plugin`) | ||
1127 | * @return NULL | ||
1128 | */ | ||
1129 | void * | ||
1130 | libgnunet_plugin_dhtu_ip_done (void *cls) | ||
1131 | { | ||
1132 | struct GNUNET_DHTU_PluginFunctions *api = cls; | ||
1133 | struct Plugin *plugin = api->cls; | ||
1134 | struct GNUNET_DHTU_Source *src; | ||
1135 | struct GNUNET_DHTU_Target *dst; | ||
1136 | |||
1137 | while (NULL != (dst = plugin->dst_head)) | ||
1138 | { | ||
1139 | plugin->env->disconnect_cb (dst->app_ctx); | ||
1140 | GNUNET_assert (NULL == dst->ph_head); | ||
1141 | GNUNET_CONTAINER_DLL_remove (plugin->dst_head, | ||
1142 | plugin->dst_tail, | ||
1143 | dst); | ||
1144 | GNUNET_free (dst); | ||
1145 | } | ||
1146 | while (NULL != (src = plugin->src_head)) | ||
1147 | { | ||
1148 | plugin->env->address_del_cb (src->app_ctx); | ||
1149 | GNUNET_CONTAINER_DLL_remove (plugin->src_head, | ||
1150 | plugin->src_tail, | ||
1151 | src); | ||
1152 | GNUNET_free (src->address); | ||
1153 | GNUNET_free (src); | ||
1154 | } | ||
1155 | plugin->env->network_size_cb (plugin->env->cls, | ||
1156 | GNUNET_TIME_UNIT_FOREVER_ABS, | ||
1157 | 0.0, | ||
1158 | 0.0); | ||
1159 | GNUNET_CONTAINER_multihashmap_destroy (plugin->dsts); | ||
1160 | if (NULL != plugin->read_task) | ||
1161 | { | ||
1162 | GNUNET_SCHEDULER_cancel (plugin->read_task); | ||
1163 | plugin->read_task = NULL; | ||
1164 | } | ||
1165 | GNUNET_SCHEDULER_cancel (plugin->scan_task); | ||
1166 | GNUNET_break (GNUNET_OK == | ||
1167 | GNUNET_NETWORK_socket_close (plugin->sock)); | ||
1168 | GNUNET_free (plugin->port); | ||
1169 | GNUNET_free (plugin); | ||
1170 | GNUNET_free (api); | ||
1171 | return NULL; | ||
1172 | } | ||