diff options
author | Martin Schanzenbach <schanzen@gnunet.org> | 2023-10-18 14:04:28 +0200 |
---|---|---|
committer | Martin Schanzenbach <schanzen@gnunet.org> | 2023-10-18 14:04:28 +0200 |
commit | 14d9446a7d2bf06dc03ba35f361bf0bbcd9e7b44 (patch) | |
tree | 1bc74819bec16a2227ca24a4c76091f5bf08776c /src/plugin/dhtu/plugin_dhtu_ip.c | |
parent | cc90a65e1a562889778d748c129bff2920e3dd21 (diff) | |
download | gnunet-14d9446a7d2bf06dc03ba35f361bf0bbcd9e7b44.tar.gz gnunet-14d9446a7d2bf06dc03ba35f361bf0bbcd9e7b44.zip |
BUILD: Move dhtu to plugin
Diffstat (limited to 'src/plugin/dhtu/plugin_dhtu_ip.c')
-rw-r--r-- | src/plugin/dhtu/plugin_dhtu_ip.c | 1171 |
1 files changed, 1171 insertions, 0 deletions
diff --git a/src/plugin/dhtu/plugin_dhtu_ip.c b/src/plugin/dhtu/plugin_dhtu_ip.c new file mode 100644 index 000000000..06d0f0f60 --- /dev/null +++ b/src/plugin/dhtu/plugin_dhtu_ip.c | |||
@@ -0,0 +1,1171 @@ | |||
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 addr socket address to find | ||
307 | * @param addrlen number of bytes in @a addr | ||
308 | * @return matching target object | ||
309 | */ | ||
310 | static struct GNUNET_DHTU_Target * | ||
311 | find_target (struct Plugin *plugin, | ||
312 | const struct GNUNET_PeerIdentity *pid, | ||
313 | const void *addr, | ||
314 | size_t addrlen) | ||
315 | { | ||
316 | struct GNUNET_HashCode key; | ||
317 | struct GNUNET_DHTU_Target *dst; | ||
318 | |||
319 | GNUNET_CRYPTO_hash (addr, | ||
320 | addrlen, | ||
321 | &key); | ||
322 | dst = GNUNET_CONTAINER_multihashmap_get (plugin->dsts, | ||
323 | &key); | ||
324 | if (NULL == dst) | ||
325 | { | ||
326 | dst = create_target (plugin, | ||
327 | pid, | ||
328 | (const struct sockaddr *) addr, | ||
329 | addrlen); | ||
330 | GNUNET_assert (GNUNET_YES == | ||
331 | GNUNET_CONTAINER_multihashmap_put ( | ||
332 | plugin->dsts, | ||
333 | &key, | ||
334 | dst, | ||
335 | GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)); | ||
336 | } | ||
337 | else | ||
338 | { | ||
339 | /* move to head of DLL */ | ||
340 | GNUNET_CONTAINER_DLL_remove (plugin->dst_head, | ||
341 | plugin->dst_tail, | ||
342 | dst); | ||
343 | GNUNET_CONTAINER_DLL_insert (plugin->dst_head, | ||
344 | plugin->dst_tail, | ||
345 | dst); | ||
346 | |||
347 | } | ||
348 | return dst; | ||
349 | } | ||
350 | |||
351 | |||
352 | /** | ||
353 | * Request creation of a session with a peer at the given @a address. | ||
354 | * | ||
355 | * @param cls closure (internal context for the plugin) | ||
356 | * @param pid identity of the target peer | ||
357 | * @param address target address to connect to | ||
358 | */ | ||
359 | static void | ||
360 | ip_try_connect (void *cls, | ||
361 | const struct GNUNET_PeerIdentity *pid, | ||
362 | const char *address) | ||
363 | { | ||
364 | struct Plugin *plugin = cls; | ||
365 | char *colon; | ||
366 | const char *port; | ||
367 | char *addr; | ||
368 | struct addrinfo hints = { | ||
369 | .ai_flags = AI_NUMERICHOST | AI_NUMERICSERV | ||
370 | }; | ||
371 | struct addrinfo *result = NULL; | ||
372 | |||
373 | if (0 != | ||
374 | strncmp (address, | ||
375 | "ip+", | ||
376 | strlen ("ip+"))) | ||
377 | return; | ||
378 | address += strlen ("ip+"); | ||
379 | if (0 != | ||
380 | strncmp (address, | ||
381 | "udp://", | ||
382 | strlen ("udp://"))) | ||
383 | return; | ||
384 | address += strlen ("udp://"); | ||
385 | addr = GNUNET_strdup (address); | ||
386 | colon = strchr (addr, ':'); | ||
387 | if (NULL == colon) | ||
388 | { | ||
389 | port = plugin->port; | ||
390 | } | ||
391 | else | ||
392 | { | ||
393 | *colon = '\0'; | ||
394 | port = colon + 1; | ||
395 | } | ||
396 | if (0 != | ||
397 | getaddrinfo (addr, | ||
398 | port, | ||
399 | &hints, | ||
400 | &result)) | ||
401 | { | ||
402 | GNUNET_break (0); | ||
403 | GNUNET_free (addr); | ||
404 | return; | ||
405 | } | ||
406 | GNUNET_free (addr); | ||
407 | (void) find_target (plugin, | ||
408 | pid, | ||
409 | result->ai_addr, | ||
410 | result->ai_addrlen); | ||
411 | freeaddrinfo (result); | ||
412 | } | ||
413 | |||
414 | |||
415 | /** | ||
416 | * Request underlay to keep the connection to @a target alive if possible. | ||
417 | * Hold may be called multiple times to express a strong preference to | ||
418 | * keep a connection, say because a @a target is in multiple tables. | ||
419 | * | ||
420 | * @param cls closure | ||
421 | * @param target connection to keep alive | ||
422 | */ | ||
423 | static struct GNUNET_DHTU_PreferenceHandle * | ||
424 | ip_hold (void *cls, | ||
425 | struct GNUNET_DHTU_Target *target) | ||
426 | { | ||
427 | struct GNUNET_DHTU_PreferenceHandle *ph; | ||
428 | |||
429 | ph = GNUNET_new (struct GNUNET_DHTU_PreferenceHandle); | ||
430 | ph->target = target; | ||
431 | GNUNET_CONTAINER_DLL_insert (target->ph_head, | ||
432 | target->ph_tail, | ||
433 | ph); | ||
434 | target->ph_count++; | ||
435 | return ph; | ||
436 | } | ||
437 | |||
438 | |||
439 | /** | ||
440 | * Do no long request underlay to keep the connection alive. | ||
441 | * | ||
442 | * @param cls closure | ||
443 | * @param target connection to keep alive | ||
444 | */ | ||
445 | static void | ||
446 | ip_drop (struct GNUNET_DHTU_PreferenceHandle *ph) | ||
447 | { | ||
448 | struct GNUNET_DHTU_Target *target = ph->target; | ||
449 | |||
450 | GNUNET_CONTAINER_DLL_remove (target->ph_head, | ||
451 | target->ph_tail, | ||
452 | ph); | ||
453 | target->ph_count--; | ||
454 | GNUNET_free (ph); | ||
455 | } | ||
456 | |||
457 | |||
458 | /** | ||
459 | * Send message to some other participant over the network. Note that | ||
460 | * sending is not guaranteeing that the other peer actually received the | ||
461 | * message. For any given @a target, the DHT must wait for the @a | ||
462 | * finished_cb to be called before calling send() again. | ||
463 | * | ||
464 | * @param cls closure (internal context for the plugin) | ||
465 | * @param target receiver identification | ||
466 | * @param msg message | ||
467 | * @param msg_size number of bytes in @a msg | ||
468 | * @param finished_cb function called once transmission is done | ||
469 | * (not called if @a target disconnects, then only the | ||
470 | * disconnect_cb is called). | ||
471 | * @param finished_cb_cls closure for @a finished_cb | ||
472 | */ | ||
473 | static void | ||
474 | ip_send (void *cls, | ||
475 | struct GNUNET_DHTU_Target *target, | ||
476 | const void *msg, | ||
477 | size_t msg_size, | ||
478 | GNUNET_SCHEDULER_TaskCallback finished_cb, | ||
479 | void *finished_cb_cls) | ||
480 | { | ||
481 | struct Plugin *plugin = cls; | ||
482 | char buf[sizeof (plugin->my_id) + msg_size]; | ||
483 | |||
484 | memcpy (buf, | ||
485 | &plugin->my_id, | ||
486 | sizeof (plugin->my_id)); | ||
487 | memcpy (&buf[sizeof (plugin->my_id)], | ||
488 | msg, | ||
489 | msg_size); | ||
490 | GNUNET_NETWORK_socket_sendto (plugin->sock, | ||
491 | buf, | ||
492 | sizeof (buf), | ||
493 | (const struct sockaddr *) &target->addr, | ||
494 | target->addrlen); | ||
495 | finished_cb (finished_cb_cls); | ||
496 | } | ||
497 | |||
498 | |||
499 | /** | ||
500 | * Create a new source on which we may be receiving traffic. | ||
501 | * | ||
502 | * @param plugin our plugin | ||
503 | * @param addr our address | ||
504 | * @param addrlen number of bytes in @a addr | ||
505 | * @return new source object | ||
506 | */ | ||
507 | static struct GNUNET_DHTU_Source * | ||
508 | create_source (struct Plugin *plugin, | ||
509 | const struct sockaddr *addr, | ||
510 | socklen_t addrlen) | ||
511 | { | ||
512 | struct GNUNET_DHTU_Source *src; | ||
513 | |||
514 | src = GNUNET_new (struct GNUNET_DHTU_Source); | ||
515 | src->addrlen = addrlen; | ||
516 | memcpy (&src->addr, | ||
517 | addr, | ||
518 | addrlen); | ||
519 | src->scan_generation = plugin->scan_generation; | ||
520 | switch (addr->sa_family) | ||
521 | { | ||
522 | case AF_INET: | ||
523 | { | ||
524 | const struct sockaddr_in *s4 = (const struct sockaddr_in *) addr; | ||
525 | char buf[INET_ADDRSTRLEN]; | ||
526 | |||
527 | GNUNET_assert (sizeof (struct sockaddr_in) == addrlen); | ||
528 | GNUNET_asprintf (&src->address, | ||
529 | "ip+udp://%s:%u", | ||
530 | inet_ntop (AF_INET, | ||
531 | &s4->sin_addr, | ||
532 | buf, | ||
533 | sizeof (buf)), | ||
534 | ntohs (s4->sin_port)); | ||
535 | } | ||
536 | break; | ||
537 | case AF_INET6: | ||
538 | { | ||
539 | const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) addr; | ||
540 | char buf[INET6_ADDRSTRLEN]; | ||
541 | |||
542 | GNUNET_assert (sizeof (struct sockaddr_in6) == addrlen); | ||
543 | GNUNET_asprintf (&src->address, | ||
544 | "ip+udp://[%s]:%u", | ||
545 | inet_ntop (AF_INET6, | ||
546 | &s6->sin6_addr, | ||
547 | buf, | ||
548 | sizeof (buf)), | ||
549 | ntohs (s6->sin6_port)); | ||
550 | } | ||
551 | break; | ||
552 | default: | ||
553 | GNUNET_break (0); | ||
554 | GNUNET_free (src); | ||
555 | return NULL; | ||
556 | } | ||
557 | GNUNET_CONTAINER_DLL_insert (plugin->src_head, | ||
558 | plugin->src_tail, | ||
559 | src); | ||
560 | plugin->env->address_add_cb (plugin->env->cls, | ||
561 | src->address, | ||
562 | src, | ||
563 | &src->app_ctx); | ||
564 | return src; | ||
565 | } | ||
566 | |||
567 | |||
568 | /** | ||
569 | * Compare two addresses excluding the ports for equality. Only compares IP | ||
570 | * address. Must only be called on AF_INET or AF_INET6 addresses. | ||
571 | * | ||
572 | * @param a1 address to compare | ||
573 | * @param a2 address to compare | ||
574 | * @param alen number of bytes in @a a1 and @a a2 | ||
575 | * @return 0 if @a a1 == @a a2. | ||
576 | */ | ||
577 | static int | ||
578 | addrcmp_np (const struct sockaddr *a1, | ||
579 | const struct sockaddr *a2, | ||
580 | size_t alen) | ||
581 | { | ||
582 | GNUNET_assert (a1->sa_family == a2->sa_family); | ||
583 | switch (a1->sa_family) | ||
584 | { | ||
585 | case AF_INET: | ||
586 | GNUNET_assert (sizeof (struct sockaddr_in) == alen); | ||
587 | { | ||
588 | const struct sockaddr_in *s1 = (const struct sockaddr_in *) a1; | ||
589 | const struct sockaddr_in *s2 = (const struct sockaddr_in *) a2; | ||
590 | |||
591 | if (s1->sin_addr.s_addr != s2->sin_addr.s_addr) | ||
592 | return 1; | ||
593 | break; | ||
594 | } | ||
595 | case AF_INET6: | ||
596 | GNUNET_assert (sizeof (struct sockaddr_in6) == alen); | ||
597 | { | ||
598 | const struct sockaddr_in6 *s1 = (const struct sockaddr_in6 *) a1; | ||
599 | const struct sockaddr_in6 *s2 = (const struct sockaddr_in6 *) a2; | ||
600 | |||
601 | if (0 != GNUNET_memcmp (&s1->sin6_addr, | ||
602 | &s2->sin6_addr)) | ||
603 | return 1; | ||
604 | break; | ||
605 | } | ||
606 | default: | ||
607 | GNUNET_assert (0); | ||
608 | } | ||
609 | return 0; | ||
610 | } | ||
611 | |||
612 | |||
613 | /** | ||
614 | * Compare two addresses for equality. Only | ||
615 | * compares IP address and port. Must only be | ||
616 | * called on AF_INET or AF_INET6 addresses. | ||
617 | * | ||
618 | * @param a1 address to compare | ||
619 | * @param a2 address to compare | ||
620 | * @param alen number of bytes in @a a1 and @a a2 | ||
621 | * @return 0 if @a a1 == @a a2. | ||
622 | */ | ||
623 | static int | ||
624 | addrcmp (const struct sockaddr *a1, | ||
625 | const struct sockaddr *a2, | ||
626 | size_t alen) | ||
627 | { | ||
628 | GNUNET_assert (a1->sa_family == a2->sa_family); | ||
629 | switch (a1->sa_family) | ||
630 | { | ||
631 | case AF_INET: | ||
632 | GNUNET_assert (sizeof (struct sockaddr_in) == alen); | ||
633 | { | ||
634 | const struct sockaddr_in *s1 = (const struct sockaddr_in *) a1; | ||
635 | const struct sockaddr_in *s2 = (const struct sockaddr_in *) a2; | ||
636 | |||
637 | if (s1->sin_port != s2->sin_port) | ||
638 | return 1; | ||
639 | if (s1->sin_addr.s_addr != s2->sin_addr.s_addr) | ||
640 | return 1; | ||
641 | break; | ||
642 | } | ||
643 | case AF_INET6: | ||
644 | GNUNET_assert (sizeof (struct sockaddr_in6) == alen); | ||
645 | { | ||
646 | const struct sockaddr_in6 *s1 = (const struct sockaddr_in6 *) a1; | ||
647 | const struct sockaddr_in6 *s2 = (const struct sockaddr_in6 *) a2; | ||
648 | |||
649 | if (s1->sin6_port != s2->sin6_port) | ||
650 | return 1; | ||
651 | if (0 != GNUNET_memcmp (&s1->sin6_addr, | ||
652 | &s2->sin6_addr)) | ||
653 | return 1; | ||
654 | break; | ||
655 | } | ||
656 | default: | ||
657 | GNUNET_assert (0); | ||
658 | } | ||
659 | return 0; | ||
660 | } | ||
661 | |||
662 | |||
663 | /** | ||
664 | * Callback function invoked for each interface found. | ||
665 | * | ||
666 | * @param cls closure | ||
667 | * @param name name of the interface (can be NULL for unknown) | ||
668 | * @param isDefault is this presumably the default interface | ||
669 | * @param addr address of this interface (can be NULL for unknown or unassigned) | ||
670 | * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned) | ||
671 | * @param netmask the network mask (can be NULL for unknown or unassigned) | ||
672 | * @param addrlen length of the address | ||
673 | * @return #GNUNET_OK to continue iteration, #GNUNET_SYSERR to abort | ||
674 | */ | ||
675 | static enum GNUNET_GenericReturnValue | ||
676 | process_ifcs (void *cls, | ||
677 | const char *name, | ||
678 | int isDefault, | ||
679 | const struct sockaddr *addr, | ||
680 | const struct sockaddr *broadcast_addr, | ||
681 | const struct sockaddr *netmask, | ||
682 | socklen_t addrlen) | ||
683 | { | ||
684 | struct Plugin *plugin = cls; | ||
685 | struct GNUNET_DHTU_Source *src; | ||
686 | |||
687 | for (src = plugin->src_head; | ||
688 | NULL != src; | ||
689 | src = src->next) | ||
690 | { | ||
691 | if ( (addrlen == src->addrlen) && | ||
692 | (0 == addrcmp_np (addr, | ||
693 | (const struct sockaddr *) &src->addr, | ||
694 | addrlen)) ) | ||
695 | { | ||
696 | src->scan_generation = plugin->scan_generation; | ||
697 | return GNUNET_OK; | ||
698 | } | ||
699 | } | ||
700 | switch (addr->sa_family) | ||
701 | { | ||
702 | case AF_INET: | ||
703 | { | ||
704 | struct sockaddr_in v4; | ||
705 | |||
706 | GNUNET_assert (sizeof(v4) == addrlen); | ||
707 | memcpy (&v4, | ||
708 | addr, | ||
709 | addrlen); | ||
710 | v4.sin_port = htons (plugin->port16); | ||
711 | (void) create_source (plugin, | ||
712 | (const struct sockaddr *) &v4, | ||
713 | sizeof (v4)); | ||
714 | break; | ||
715 | } | ||
716 | case AF_INET6: | ||
717 | { | ||
718 | struct sockaddr_in6 v6; | ||
719 | |||
720 | GNUNET_assert (sizeof(v6) == addrlen); | ||
721 | memcpy (&v6, | ||
722 | addr, | ||
723 | addrlen); | ||
724 | v6.sin6_port = htons (plugin->port16); | ||
725 | (void) create_source (plugin, | ||
726 | (const struct sockaddr *) &v6, | ||
727 | sizeof (v6)); | ||
728 | break; | ||
729 | } | ||
730 | } | ||
731 | return GNUNET_OK; | ||
732 | } | ||
733 | |||
734 | |||
735 | /** | ||
736 | * Scan network interfaces for IP address changes. | ||
737 | * | ||
738 | * @param cls a `struct Plugin` | ||
739 | */ | ||
740 | static void | ||
741 | scan (void *cls) | ||
742 | { | ||
743 | struct Plugin *plugin = cls; | ||
744 | struct GNUNET_DHTU_Source *next; | ||
745 | |||
746 | plugin->scan_generation++; | ||
747 | GNUNET_OS_network_interfaces_list (&process_ifcs, | ||
748 | plugin); | ||
749 | for (struct GNUNET_DHTU_Source *src = plugin->src_head; | ||
750 | NULL != src; | ||
751 | src = next) | ||
752 | { | ||
753 | next = src->next; | ||
754 | if (src->scan_generation >= plugin->scan_generation) | ||
755 | continue; | ||
756 | GNUNET_CONTAINER_DLL_remove (plugin->src_head, | ||
757 | plugin->src_tail, | ||
758 | src); | ||
759 | plugin->env->address_del_cb (src->app_ctx); | ||
760 | GNUNET_free (src->address); | ||
761 | GNUNET_free (src); | ||
762 | } | ||
763 | plugin->scan_task = GNUNET_SCHEDULER_add_delayed (SCAN_FREQ, | ||
764 | &scan, | ||
765 | plugin); | ||
766 | } | ||
767 | |||
768 | |||
769 | /** | ||
770 | * Find our source matching @a addr. If none exists, | ||
771 | * create one! | ||
772 | * | ||
773 | * @param plugin the plugin handle | ||
774 | * @param addr socket address to find | ||
775 | * @param addrlen number of bytes in @a addr | ||
776 | * @return matching source object | ||
777 | */ | ||
778 | static struct GNUNET_DHTU_Source * | ||
779 | find_source (struct Plugin *plugin, | ||
780 | const void *addr, | ||
781 | size_t addrlen) | ||
782 | { | ||
783 | for (struct GNUNET_DHTU_Source *src = plugin->src_head; | ||
784 | NULL != src; | ||
785 | src = src->next) | ||
786 | { | ||
787 | if ( (addrlen == src->addrlen) && | ||
788 | (0 == addrcmp (addr, | ||
789 | (const struct sockaddr *) &src->addr, | ||
790 | addrlen)) ) | ||
791 | return src; | ||
792 | } | ||
793 | |||
794 | return create_source (plugin, | ||
795 | (const struct sockaddr *) addr, | ||
796 | addrlen); | ||
797 | } | ||
798 | |||
799 | |||
800 | /** | ||
801 | * UDP socket is ready to receive. Read. | ||
802 | * | ||
803 | * @param cls our `struct Plugin *` | ||
804 | */ | ||
805 | static void | ||
806 | read_cb (void *cls) | ||
807 | { | ||
808 | struct Plugin *plugin = cls; | ||
809 | ssize_t ret; | ||
810 | const struct GNUNET_PeerIdentity *pid; | ||
811 | char buf[65536] GNUNET_ALIGN; | ||
812 | struct sockaddr_storage sa; | ||
813 | struct iovec iov = { | ||
814 | .iov_base = buf, | ||
815 | .iov_len = sizeof (buf) | ||
816 | }; | ||
817 | char ctl[128]; | ||
818 | struct msghdr mh = { | ||
819 | .msg_name = &sa, | ||
820 | .msg_namelen = sizeof (sa), | ||
821 | .msg_iov = &iov, | ||
822 | .msg_iovlen = 1, | ||
823 | .msg_control = ctl, | ||
824 | .msg_controllen = sizeof (ctl) | ||
825 | }; | ||
826 | struct GNUNET_DHTU_Target *dst = NULL; | ||
827 | struct GNUNET_DHTU_Source *src = NULL; | ||
828 | |||
829 | ret = recvmsg (GNUNET_NETWORK_get_fd (plugin->sock), | ||
830 | &mh, | ||
831 | MSG_DONTWAIT); | ||
832 | plugin->read_task = GNUNET_SCHEDULER_add_read_net ( | ||
833 | GNUNET_TIME_UNIT_FOREVER_REL, | ||
834 | plugin->sock, | ||
835 | &read_cb, | ||
836 | plugin); | ||
837 | if (ret < 0) | ||
838 | return; /* read failure, hopefully EAGAIN */ | ||
839 | if (ret < sizeof (*pid)) | ||
840 | { | ||
841 | GNUNET_break_op (0); | ||
842 | return; | ||
843 | } | ||
844 | /* find IP where we received message */ | ||
845 | for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mh); | ||
846 | NULL != cmsg; | ||
847 | cmsg = CMSG_NXTHDR (&mh, | ||
848 | cmsg)) | ||
849 | { | ||
850 | GNUNET_log (GNUNET_ERROR_TYPE_INFO, | ||
851 | "Got CMSG level %u (%d/%d), type %u (%d/%d)\n", | ||
852 | cmsg->cmsg_level, | ||
853 | (cmsg->cmsg_level == IPPROTO_IP), | ||
854 | (cmsg->cmsg_level == IPPROTO_IPV6), | ||
855 | cmsg->cmsg_type, | ||
856 | (cmsg->cmsg_type == IP_PKTINFO), | ||
857 | (cmsg->cmsg_type == IPV6_PKTINFO)); | ||
858 | if ( (cmsg->cmsg_level == IPPROTO_IP) && | ||
859 | (cmsg->cmsg_type == IP_PKTINFO) ) | ||
860 | { | ||
861 | if (CMSG_LEN (sizeof (struct in_pktinfo)) == | ||
862 | cmsg->cmsg_len) | ||
863 | { | ||
864 | struct in_pktinfo pi; | ||
865 | |||
866 | memcpy (&pi, | ||
867 | CMSG_DATA (cmsg), | ||
868 | sizeof (pi)); | ||
869 | { | ||
870 | struct sockaddr_in sa = { | ||
871 | .sin_family = AF_INET, | ||
872 | .sin_addr = pi.ipi_addr, | ||
873 | .sin_port = htons (plugin->port16) | ||
874 | }; | ||
875 | |||
876 | src = find_source (plugin, | ||
877 | &sa, | ||
878 | sizeof (sa)); | ||
879 | /* For sources we discovered by reading, | ||
880 | force the generation far into the future */ | ||
881 | src->scan_generation = plugin->scan_generation + 60; | ||
882 | } | ||
883 | break; | ||
884 | } | ||
885 | else | ||
886 | GNUNET_break (0); | ||
887 | } | ||
888 | if ( (cmsg->cmsg_level == IPPROTO_IPV6) && | ||
889 | (cmsg->cmsg_type == IPV6_PKTINFO) ) | ||
890 | { | ||
891 | if (CMSG_LEN (sizeof (struct in6_pktinfo)) == | ||
892 | cmsg->cmsg_len) | ||
893 | { | ||
894 | struct in6_pktinfo pi; | ||
895 | |||
896 | memcpy (&pi, | ||
897 | CMSG_DATA (cmsg), | ||
898 | sizeof (pi)); | ||
899 | { | ||
900 | struct sockaddr_in6 sa = { | ||
901 | .sin6_family = AF_INET6, | ||
902 | .sin6_addr = pi.ipi6_addr, | ||
903 | .sin6_port = htons (plugin->port16), | ||
904 | .sin6_scope_id = pi.ipi6_ifindex | ||
905 | }; | ||
906 | |||
907 | src = find_source (plugin, | ||
908 | &sa, | ||
909 | sizeof (sa)); | ||
910 | /* For sources we discovered by reading, | ||
911 | force the generation far into the future */ | ||
912 | src->scan_generation = plugin->scan_generation + 60; | ||
913 | break; | ||
914 | } | ||
915 | } | ||
916 | else | ||
917 | GNUNET_break (0); | ||
918 | } | ||
919 | } | ||
920 | if (NULL == src) | ||
921 | { | ||
922 | GNUNET_break (0); | ||
923 | return; | ||
924 | } | ||
925 | pid = (const struct GNUNET_PeerIdentity *) buf; | ||
926 | dst = find_target (plugin, | ||
927 | pid, | ||
928 | &sa, | ||
929 | mh.msg_namelen); | ||
930 | if (NULL == dst) | ||
931 | { | ||
932 | GNUNET_break (0); | ||
933 | return; | ||
934 | } | ||
935 | plugin->env->receive_cb (plugin->env->cls, | ||
936 | &dst->app_ctx, | ||
937 | &src->app_ctx, | ||
938 | &buf[sizeof(*pid)], | ||
939 | ret - sizeof (*pid)); | ||
940 | } | ||
941 | |||
942 | |||
943 | /** | ||
944 | * Entry point for the plugin. | ||
945 | * | ||
946 | * @param cls closure (the `struct GNUNET_DHTU_PluginEnvironment`) | ||
947 | * @return the plugin's API | ||
948 | */ | ||
949 | void * | ||
950 | libgnunet_plugin_dhtu_ip_init (void *cls) | ||
951 | { | ||
952 | struct GNUNET_DHTU_PluginEnvironment *env = cls; | ||
953 | struct GNUNET_DHTU_PluginFunctions *api; | ||
954 | struct Plugin *plugin; | ||
955 | char *port; | ||
956 | unsigned int nport; | ||
957 | int sock; | ||
958 | int af; | ||
959 | unsigned long long nse; | ||
960 | |||
961 | if (GNUNET_OK != | ||
962 | GNUNET_CONFIGURATION_get_value_number (env->cfg, | ||
963 | "DHTU-IP", | ||
964 | "NSE", | ||
965 | &nse)) | ||
966 | { | ||
967 | GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, | ||
968 | "DHTU-IP", | ||
969 | "NSE"); | ||
970 | return NULL; | ||
971 | } | ||
972 | if (GNUNET_OK != | ||
973 | GNUNET_CONFIGURATION_get_value_string (env->cfg, | ||
974 | "DHTU-IP", | ||
975 | "UDP_PORT", | ||
976 | &port)) | ||
977 | { | ||
978 | GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, | ||
979 | "DHTU-IP", | ||
980 | "UDP_PORT"); | ||
981 | return NULL; | ||
982 | } | ||
983 | { | ||
984 | char dummy; | ||
985 | |||
986 | if ( (1 != sscanf (port, | ||
987 | "%u%c", | ||
988 | &nport, | ||
989 | &dummy)) || | ||
990 | (nport > UINT16_MAX) ) | ||
991 | { | ||
992 | GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, | ||
993 | "DHTU-IP", | ||
994 | "UDP_PORT", | ||
995 | "must be number below 65536"); | ||
996 | GNUNET_free (port); | ||
997 | return NULL; | ||
998 | } | ||
999 | } | ||
1000 | plugin = GNUNET_new (struct Plugin); | ||
1001 | plugin->env = env; | ||
1002 | plugin->port = port; | ||
1003 | plugin->port16 = (uint16_t) nport; | ||
1004 | if (GNUNET_OK != | ||
1005 | GNUNET_CRYPTO_get_peer_identity (env->cfg, | ||
1006 | &plugin->my_id)) | ||
1007 | { | ||
1008 | GNUNET_free (plugin); | ||
1009 | return NULL; | ||
1010 | } | ||
1011 | af = AF_INET6; | ||
1012 | sock = socket (af, | ||
1013 | SOCK_DGRAM, | ||
1014 | IPPROTO_UDP); | ||
1015 | if (-1 == sock) | ||
1016 | { | ||
1017 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, | ||
1018 | "socket"); | ||
1019 | GNUNET_free (plugin->port); | ||
1020 | GNUNET_free (plugin); | ||
1021 | return NULL; | ||
1022 | } | ||
1023 | switch (af) | ||
1024 | { | ||
1025 | case AF_INET: | ||
1026 | { | ||
1027 | int on = 1; | ||
1028 | |||
1029 | if (0 != | ||
1030 | setsockopt (sock, | ||
1031 | IPPROTO_IP, | ||
1032 | IP_PKTINFO, | ||
1033 | &on, | ||
1034 | sizeof (on))) | ||
1035 | { | ||
1036 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, | ||
1037 | "setsockopt"); | ||
1038 | } | ||
1039 | } | ||
1040 | { | ||
1041 | struct sockaddr_in sa = { | ||
1042 | .sin_family = AF_INET, | ||
1043 | .sin_port = htons ((uint16_t) nport) | ||
1044 | }; | ||
1045 | |||
1046 | if (0 != | ||
1047 | bind (sock, | ||
1048 | (const struct sockaddr *) &sa, | ||
1049 | sizeof (sa))) | ||
1050 | { | ||
1051 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, | ||
1052 | "socket"); | ||
1053 | GNUNET_break (0 == | ||
1054 | close (sock)); | ||
1055 | GNUNET_free (plugin->port); | ||
1056 | GNUNET_free (plugin); | ||
1057 | return NULL; | ||
1058 | } | ||
1059 | } | ||
1060 | break; | ||
1061 | case AF_INET6: | ||
1062 | { | ||
1063 | int on = 1; | ||
1064 | |||
1065 | if (0 != | ||
1066 | setsockopt (sock, | ||
1067 | IPPROTO_IPV6, | ||
1068 | IPV6_RECVPKTINFO, | ||
1069 | &on, | ||
1070 | sizeof (on))) | ||
1071 | { | ||
1072 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, | ||
1073 | "setsockopt"); | ||
1074 | } | ||
1075 | } | ||
1076 | { | ||
1077 | struct sockaddr_in6 sa = { | ||
1078 | .sin6_family = AF_INET6, | ||
1079 | .sin6_port = htons ((uint16_t) nport) | ||
1080 | }; | ||
1081 | |||
1082 | if (0 != | ||
1083 | bind (sock, | ||
1084 | (const struct sockaddr *) &sa, | ||
1085 | sizeof (sa))) | ||
1086 | { | ||
1087 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, | ||
1088 | "socket"); | ||
1089 | GNUNET_break (0 == | ||
1090 | close (sock)); | ||
1091 | GNUNET_free (plugin->port); | ||
1092 | GNUNET_free (plugin); | ||
1093 | return NULL; | ||
1094 | } | ||
1095 | } | ||
1096 | break; | ||
1097 | } | ||
1098 | plugin->dsts = GNUNET_CONTAINER_multihashmap_create (128, | ||
1099 | GNUNET_NO); | ||
1100 | plugin->sock = GNUNET_NETWORK_socket_box_native (sock); | ||
1101 | plugin->read_task = GNUNET_SCHEDULER_add_read_net ( | ||
1102 | GNUNET_TIME_UNIT_FOREVER_REL, | ||
1103 | plugin->sock, | ||
1104 | &read_cb, | ||
1105 | plugin); | ||
1106 | env->network_size_cb (env->cls, | ||
1107 | GNUNET_TIME_UNIT_ZERO_ABS, | ||
1108 | log (nse) / log (2), | ||
1109 | -1.0 /* stddev */); | ||
1110 | plugin->scan_task = GNUNET_SCHEDULER_add_now (&scan, | ||
1111 | plugin); | ||
1112 | api = GNUNET_new (struct GNUNET_DHTU_PluginFunctions); | ||
1113 | api->cls = plugin; | ||
1114 | api->try_connect = &ip_try_connect; | ||
1115 | api->hold = &ip_hold; | ||
1116 | api->drop = &ip_drop; | ||
1117 | api->send = &ip_send; | ||
1118 | return api; | ||
1119 | } | ||
1120 | |||
1121 | |||
1122 | /** | ||
1123 | * Exit point from the plugin. | ||
1124 | * | ||
1125 | * @param cls closure (our `struct Plugin`) | ||
1126 | * @return NULL | ||
1127 | */ | ||
1128 | void * | ||
1129 | libgnunet_plugin_dhtu_ip_done (void *cls) | ||
1130 | { | ||
1131 | struct GNUNET_DHTU_PluginFunctions *api = cls; | ||
1132 | struct Plugin *plugin = api->cls; | ||
1133 | struct GNUNET_DHTU_Source *src; | ||
1134 | struct GNUNET_DHTU_Target *dst; | ||
1135 | |||
1136 | while (NULL != (dst = plugin->dst_head)) | ||
1137 | { | ||
1138 | plugin->env->disconnect_cb (dst->app_ctx); | ||
1139 | GNUNET_assert (NULL == dst->ph_head); | ||
1140 | GNUNET_CONTAINER_DLL_remove (plugin->dst_head, | ||
1141 | plugin->dst_tail, | ||
1142 | dst); | ||
1143 | GNUNET_free (dst); | ||
1144 | } | ||
1145 | while (NULL != (src = plugin->src_head)) | ||
1146 | { | ||
1147 | plugin->env->address_del_cb (src->app_ctx); | ||
1148 | GNUNET_CONTAINER_DLL_remove (plugin->src_head, | ||
1149 | plugin->src_tail, | ||
1150 | src); | ||
1151 | GNUNET_free (src->address); | ||
1152 | GNUNET_free (src); | ||
1153 | } | ||
1154 | plugin->env->network_size_cb (plugin->env->cls, | ||
1155 | GNUNET_TIME_UNIT_FOREVER_ABS, | ||
1156 | 0.0, | ||
1157 | 0.0); | ||
1158 | GNUNET_CONTAINER_multihashmap_destroy (plugin->dsts); | ||
1159 | if (NULL != plugin->read_task) | ||
1160 | { | ||
1161 | GNUNET_SCHEDULER_cancel (plugin->read_task); | ||
1162 | plugin->read_task = NULL; | ||
1163 | } | ||
1164 | GNUNET_SCHEDULER_cancel (plugin->scan_task); | ||
1165 | GNUNET_break (GNUNET_OK == | ||
1166 | GNUNET_NETWORK_socket_close (plugin->sock)); | ||
1167 | GNUNET_free (plugin->port); | ||
1168 | GNUNET_free (plugin); | ||
1169 | GNUNET_free (api); | ||
1170 | return NULL; | ||
1171 | } | ||