diff options
Diffstat (limited to 'src/transport/plugin_transport_tcp.c')
-rw-r--r-- | src/transport/plugin_transport_tcp.c | 1782 |
1 files changed, 1782 insertions, 0 deletions
diff --git a/src/transport/plugin_transport_tcp.c b/src/transport/plugin_transport_tcp.c new file mode 100644 index 000000000..c87056e71 --- /dev/null +++ b/src/transport/plugin_transport_tcp.c | |||
@@ -0,0 +1,1782 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors) | ||
4 | |||
5 | GNUnet is free software; you can redistribute it and/or modify | ||
6 | it under the terms of the GNU General Public License as published | ||
7 | by the Free Software Foundation; either version 2, or (at your | ||
8 | 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 | General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU General Public License | ||
16 | along with GNUnet; see the file COPYING. If not, write to the | ||
17 | Free Software Foundation, Inc., 59 Temple Place - Suite 330, | ||
18 | Boston, MA 02111-1307, USA. | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file transport/plugin_transport_tcp.c | ||
23 | * @brief Implementation of the TCP transport service | ||
24 | * @author Christian Grothoff | ||
25 | */ | ||
26 | |||
27 | #include "platform.h" | ||
28 | #include "gnunet_hello_lib.h" | ||
29 | #include "gnunet_network_lib.h" | ||
30 | #include "gnunet_os_lib.h" | ||
31 | #include "gnunet_peerinfo_service.h" | ||
32 | #include "gnunet_protocols.h" | ||
33 | #include "gnunet_resolver_service.h" | ||
34 | #include "gnunet_server_lib.h" | ||
35 | #include "gnunet_service_lib.h" | ||
36 | #include "gnunet_statistics_service.h" | ||
37 | #include "gnunet_transport_service.h" | ||
38 | #include "plugin_transport.h" | ||
39 | #include "transport.h" | ||
40 | |||
41 | #define DEBUG_TCP GNUNET_NO | ||
42 | |||
43 | /** | ||
44 | * After how long do we expire an address that we | ||
45 | * learned from another peer if it is not reconfirmed | ||
46 | * by anyone? | ||
47 | */ | ||
48 | #define LEARNED_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 6) | ||
49 | |||
50 | /** | ||
51 | * How long until we give up on transmitting the welcome message? | ||
52 | */ | ||
53 | #define WELCOME_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30) | ||
54 | |||
55 | /** | ||
56 | * How long until we give up on transmitting the welcome message? | ||
57 | */ | ||
58 | #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5) | ||
59 | |||
60 | /** | ||
61 | * For how many messages back to we keep transmission times? | ||
62 | */ | ||
63 | #define ACK_LOG_SIZE 32 | ||
64 | |||
65 | /** | ||
66 | * Initial handshake message for a session. This header | ||
67 | * is followed by the address that the other peer used to | ||
68 | * connect to us (so that we may learn it) or the address | ||
69 | * that the other peer got from the accept call. | ||
70 | */ | ||
71 | struct WelcomeMessage | ||
72 | { | ||
73 | struct GNUNET_MessageHeader header; | ||
74 | |||
75 | /** | ||
76 | * Identity of the node connecting (TCP client) | ||
77 | */ | ||
78 | struct GNUNET_PeerIdentity clientIdentity; | ||
79 | |||
80 | }; | ||
81 | |||
82 | |||
83 | /** | ||
84 | * Encapsulation for normal TCP traffic. | ||
85 | */ | ||
86 | struct DataMessage | ||
87 | { | ||
88 | struct GNUNET_MessageHeader header; | ||
89 | |||
90 | /** | ||
91 | * For alignment. | ||
92 | */ | ||
93 | uint32_t reserved GNUNET_PACKED; | ||
94 | |||
95 | /** | ||
96 | * Number of the last message that was received from the other peer. | ||
97 | */ | ||
98 | uint64_t ack_in GNUNET_PACKED; | ||
99 | |||
100 | /** | ||
101 | * Number of this outgoing message. | ||
102 | */ | ||
103 | uint64_t ack_out GNUNET_PACKED; | ||
104 | |||
105 | /** | ||
106 | * How long was sending this ack delayed by the other peer | ||
107 | * (estimate). The receiver of this message can use the delay | ||
108 | * between sending his message number 'ack' and receiving this ack | ||
109 | * minus the delay as an estimate of the round-trip time. | ||
110 | */ | ||
111 | struct GNUNET_TIME_RelativeNBO delay; | ||
112 | |||
113 | }; | ||
114 | |||
115 | |||
116 | /** | ||
117 | * Encapsulation of all of the state of the plugin. | ||
118 | */ | ||
119 | struct Plugin; | ||
120 | |||
121 | |||
122 | /** | ||
123 | * Information kept for each message that is yet to | ||
124 | * be transmitted. | ||
125 | */ | ||
126 | struct PendingMessage | ||
127 | { | ||
128 | |||
129 | /** | ||
130 | * This is a linked list. | ||
131 | */ | ||
132 | struct PendingMessage *next; | ||
133 | |||
134 | /** | ||
135 | * The pending message, pointer to the end | ||
136 | * of this struct, do not free! | ||
137 | */ | ||
138 | struct GNUNET_MessageHeader *msg; | ||
139 | |||
140 | |||
141 | /** | ||
142 | * Continuation function to call once the message | ||
143 | * has been sent. Can be NULL if there is no | ||
144 | * continuation to call. | ||
145 | */ | ||
146 | GNUNET_TRANSPORT_TransmitContinuation transmit_cont; | ||
147 | |||
148 | /** | ||
149 | * Closure for transmit_cont. | ||
150 | */ | ||
151 | void *transmit_cont_cls; | ||
152 | |||
153 | /** | ||
154 | * Timeout value for the pending message. | ||
155 | */ | ||
156 | struct GNUNET_TIME_Absolute timeout; | ||
157 | |||
158 | /** | ||
159 | * GNUNET_YES if this is a welcome message; | ||
160 | * otherwise this should be a DATA message. | ||
161 | */ | ||
162 | int is_welcome; | ||
163 | |||
164 | }; | ||
165 | |||
166 | |||
167 | /** | ||
168 | * Session handle for TCP connections. | ||
169 | */ | ||
170 | struct Session | ||
171 | { | ||
172 | |||
173 | /** | ||
174 | * Stored in a linked list. | ||
175 | */ | ||
176 | struct Session *next; | ||
177 | |||
178 | /** | ||
179 | * Pointer to the global plugin struct. | ||
180 | */ | ||
181 | struct Plugin *plugin; | ||
182 | |||
183 | /** | ||
184 | * The client (used to identify this connection) | ||
185 | */ | ||
186 | struct GNUNET_SERVER_Client *client; | ||
187 | |||
188 | /** | ||
189 | * gnunet-service-transport context for this connection. | ||
190 | */ | ||
191 | struct ReadyList *service_context; | ||
192 | |||
193 | /** | ||
194 | * Messages currently pending for transmission | ||
195 | * to this peer, if any. | ||
196 | */ | ||
197 | struct PendingMessage *pending_messages; | ||
198 | |||
199 | /** | ||
200 | * Handle for pending transmission request. | ||
201 | */ | ||
202 | struct GNUNET_NETWORK_TransmitHandle *transmit_handle; | ||
203 | |||
204 | /** | ||
205 | * To whom are we talking to (set to our identity | ||
206 | * if we are still waiting for the welcome message) | ||
207 | */ | ||
208 | struct GNUNET_PeerIdentity target; | ||
209 | |||
210 | /** | ||
211 | * At what time did we reset last_received last? | ||
212 | */ | ||
213 | struct GNUNET_TIME_Absolute last_quota_update; | ||
214 | |||
215 | /** | ||
216 | * Address of the other peer if WE initiated the connection | ||
217 | * (and hence can be sure what it is), otherwise NULL. | ||
218 | */ | ||
219 | void *connect_addr; | ||
220 | |||
221 | /** | ||
222 | * How many bytes have we received since the "last_quota_update" | ||
223 | * timestamp? | ||
224 | */ | ||
225 | uint64_t last_received; | ||
226 | |||
227 | /** | ||
228 | * Our current latency estimate (in ms). | ||
229 | */ | ||
230 | double latency_estimate; | ||
231 | |||
232 | /** | ||
233 | * Time when we generated the last ACK_LOG_SIZE acks. | ||
234 | * (the "last" refers to the "out_msg_counter" here) | ||
235 | */ | ||
236 | struct GNUNET_TIME_Absolute gen_time[ACK_LOG_SIZE]; | ||
237 | |||
238 | /** | ||
239 | * Our current sequence number. | ||
240 | */ | ||
241 | uint64_t out_msg_counter; | ||
242 | |||
243 | /** | ||
244 | * Highest received incoming sequence number. | ||
245 | */ | ||
246 | uint64_t max_in_msg_counter; | ||
247 | |||
248 | /** | ||
249 | * Number of bytes per ms that this peer is allowed | ||
250 | * to send to us. | ||
251 | */ | ||
252 | uint32_t quota_in; | ||
253 | |||
254 | /** | ||
255 | * Length of connect_addr, can be 0. | ||
256 | */ | ||
257 | size_t connect_alen; | ||
258 | |||
259 | /** | ||
260 | * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO) | ||
261 | */ | ||
262 | int expecting_welcome; | ||
263 | |||
264 | /** | ||
265 | * Are we still trying to connect? | ||
266 | */ | ||
267 | int still_connecting; | ||
268 | |||
269 | }; | ||
270 | |||
271 | |||
272 | /** | ||
273 | * Encapsulation of all of the state of the plugin. | ||
274 | */ | ||
275 | struct Plugin | ||
276 | { | ||
277 | /** | ||
278 | * Our environment. | ||
279 | */ | ||
280 | struct GNUNET_TRANSPORT_PluginEnvironment *env; | ||
281 | |||
282 | /** | ||
283 | * The listen socket. | ||
284 | */ | ||
285 | struct GNUNET_NETWORK_SocketHandle *lsock; | ||
286 | |||
287 | /** | ||
288 | * List of open TCP sessions. | ||
289 | */ | ||
290 | struct Session *sessions; | ||
291 | |||
292 | /** | ||
293 | * Handle for the statistics service. | ||
294 | */ | ||
295 | struct GNUNET_STATISTICS_Handle *statistics; | ||
296 | |||
297 | /** | ||
298 | * Handle to the network service. | ||
299 | */ | ||
300 | struct GNUNET_SERVICE_Context *service; | ||
301 | |||
302 | /** | ||
303 | * Handle to the server for this service. | ||
304 | */ | ||
305 | struct GNUNET_SERVER_Handle *server; | ||
306 | |||
307 | /** | ||
308 | * Copy of the handler array where the closures are | ||
309 | * set to this struct's instance. | ||
310 | */ | ||
311 | struct GNUNET_SERVER_MessageHandler *handlers; | ||
312 | |||
313 | /** | ||
314 | * ID of task used to update our addresses when one expires. | ||
315 | */ | ||
316 | GNUNET_SCHEDULER_TaskIdentifier address_update_task; | ||
317 | |||
318 | /** | ||
319 | * Port that we are actually listening on. | ||
320 | */ | ||
321 | uint16_t open_port; | ||
322 | |||
323 | /** | ||
324 | * Port that the user said we would have visible to the | ||
325 | * rest of the world. | ||
326 | */ | ||
327 | uint16_t adv_port; | ||
328 | |||
329 | }; | ||
330 | |||
331 | |||
332 | /** | ||
333 | * Find the session handle for the given peer. | ||
334 | */ | ||
335 | static struct Session * | ||
336 | find_session_by_target (struct Plugin *plugin, | ||
337 | const struct GNUNET_PeerIdentity *target) | ||
338 | { | ||
339 | struct Session *ret; | ||
340 | |||
341 | ret = plugin->sessions; | ||
342 | while ((ret != NULL) && | ||
343 | (0 != memcmp (target, | ||
344 | &ret->target, sizeof (struct GNUNET_PeerIdentity)))) | ||
345 | ret = ret->next; | ||
346 | return ret; | ||
347 | } | ||
348 | |||
349 | |||
350 | /** | ||
351 | * Find the session handle for the given peer. | ||
352 | */ | ||
353 | static struct Session * | ||
354 | find_session_by_client (struct Plugin *plugin, | ||
355 | const struct GNUNET_SERVER_Client *client) | ||
356 | { | ||
357 | struct Session *ret; | ||
358 | |||
359 | ret = plugin->sessions; | ||
360 | while ((ret != NULL) && (client != ret->client)) | ||
361 | ret = ret->next; | ||
362 | return ret; | ||
363 | } | ||
364 | |||
365 | |||
366 | /** | ||
367 | * Create a welcome message. | ||
368 | */ | ||
369 | static struct PendingMessage * | ||
370 | create_welcome (size_t addrlen, const void *addr, struct Plugin *plugin) | ||
371 | { | ||
372 | struct PendingMessage *pm; | ||
373 | struct WelcomeMessage *welcome; | ||
374 | |||
375 | pm = GNUNET_malloc (sizeof (struct PendingMessage) + | ||
376 | sizeof (struct WelcomeMessage) + addrlen); | ||
377 | pm->msg = (struct GNUNET_MessageHeader *) &pm[1]; | ||
378 | welcome = (struct WelcomeMessage *) &pm[1]; | ||
379 | welcome->header.size = htons (sizeof (struct WelcomeMessage) + addrlen); | ||
380 | welcome->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME); | ||
381 | GNUNET_CRYPTO_hash (plugin->env->my_public_key, | ||
382 | sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded), | ||
383 | &welcome->clientIdentity.hashPubKey); | ||
384 | memcpy (&welcome[1], addr, addrlen); | ||
385 | pm->timeout = GNUNET_TIME_relative_to_absolute (WELCOME_TIMEOUT); | ||
386 | pm->is_welcome = GNUNET_YES; | ||
387 | return pm; | ||
388 | } | ||
389 | |||
390 | |||
391 | /** | ||
392 | * Create a new session using the specified address | ||
393 | * for the welcome message. | ||
394 | * | ||
395 | * @param plugin us | ||
396 | * @param target peer to connect to | ||
397 | * @param client client to use | ||
398 | * @param addrlen IPv4 or IPv6 | ||
399 | * @param addr either struct sockaddr_in or struct sockaddr_in6 | ||
400 | * @return NULL connection failed / invalid address | ||
401 | */ | ||
402 | static struct Session * | ||
403 | create_session (struct Plugin *plugin, | ||
404 | const struct GNUNET_PeerIdentity *target, | ||
405 | struct GNUNET_SERVER_Client *client, | ||
406 | const void *addr, size_t addrlen) | ||
407 | { | ||
408 | struct Session *ret; | ||
409 | |||
410 | ret = GNUNET_malloc (sizeof (struct Session)); | ||
411 | ret->plugin = plugin; | ||
412 | ret->next = plugin->sessions; | ||
413 | plugin->sessions = ret; | ||
414 | ret->client = client; | ||
415 | ret->target = *target; | ||
416 | ret->last_quota_update = GNUNET_TIME_absolute_get (); | ||
417 | ret->quota_in = plugin->env->default_quota_in; | ||
418 | ret->expecting_welcome = GNUNET_YES; | ||
419 | ret->pending_messages = create_welcome (addrlen, addr, plugin); | ||
420 | return ret; | ||
421 | } | ||
422 | |||
423 | |||
424 | /** | ||
425 | * Create a new session connecting to the specified | ||
426 | * target at the specified address. | ||
427 | * | ||
428 | * @param plugin us | ||
429 | * @param target peer to connect to | ||
430 | * @param addrlen IPv4 or IPv6 | ||
431 | * @param addr either struct sockaddr_in or struct sockaddr_in6 | ||
432 | * @return NULL connection failed / invalid address | ||
433 | */ | ||
434 | static struct Session * | ||
435 | connect_and_create_session (struct Plugin *plugin, | ||
436 | const struct GNUNET_PeerIdentity *target, | ||
437 | const void *addr, size_t addrlen) | ||
438 | { | ||
439 | struct GNUNET_SERVER_Client *client; | ||
440 | struct GNUNET_NETWORK_SocketHandle *conn; | ||
441 | struct Session *session; | ||
442 | int af; | ||
443 | char buf[INET6_ADDRSTRLEN]; | ||
444 | uint16_t port; | ||
445 | |||
446 | session = plugin->sessions; | ||
447 | while (session != NULL) | ||
448 | { | ||
449 | if ((0 == memcmp (target, | ||
450 | &session->target, | ||
451 | sizeof (struct GNUNET_PeerIdentity))) && | ||
452 | (session->connect_alen == addrlen) && | ||
453 | (0 == memcmp (session->connect_addr, addr, addrlen))) | ||
454 | return session; /* already exists! */ | ||
455 | session = session->next; | ||
456 | } | ||
457 | |||
458 | if (addrlen == sizeof (struct sockaddr_in)) | ||
459 | { | ||
460 | af = AF_INET; | ||
461 | inet_ntop (af, | ||
462 | &((struct sockaddr_in *) addr)->sin_addr, buf, sizeof (buf)); | ||
463 | port = ntohs (((struct sockaddr_in *) addr)->sin_port); | ||
464 | } | ||
465 | else if (addrlen == sizeof (struct sockaddr_in6)) | ||
466 | { | ||
467 | af = AF_INET6; | ||
468 | inet_ntop (af, | ||
469 | &((struct sockaddr_in6 *) addr)->sin6_addr, | ||
470 | buf, sizeof (buf)); | ||
471 | port = ntohs (((struct sockaddr_in6 *) addr)->sin6_port); | ||
472 | } | ||
473 | else | ||
474 | { | ||
475 | GNUNET_break_op (0); | ||
476 | return NULL; /* invalid address */ | ||
477 | } | ||
478 | conn = GNUNET_NETWORK_socket_create_from_sockaddr (plugin->env->sched, | ||
479 | af, | ||
480 | addr, | ||
481 | addrlen, | ||
482 | GNUNET_SERVER_MAX_MESSAGE_SIZE); | ||
483 | if (conn == NULL) | ||
484 | { | ||
485 | #if DEBUG_TCP | ||
486 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
487 | "tcp", | ||
488 | "Failed to create connection to peer at `%s:%u'.\n", | ||
489 | buf, port); | ||
490 | #endif | ||
491 | return NULL; | ||
492 | } | ||
493 | client = GNUNET_SERVER_connect_socket (plugin->server, conn); | ||
494 | GNUNET_assert (client != NULL); | ||
495 | session = create_session (plugin, target, client, addr, addrlen); | ||
496 | session->connect_alen = addrlen; | ||
497 | session->connect_addr = GNUNET_malloc (addrlen); | ||
498 | memcpy (session->connect_addr, addr, addrlen); | ||
499 | #if DEBUG_TCP | ||
500 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
501 | "tcp", | ||
502 | "Creating new session %p with `%s:%u' based on `%s' request.\n", | ||
503 | session, buf, port, "send_to"); | ||
504 | #endif | ||
505 | return session; | ||
506 | } | ||
507 | |||
508 | |||
509 | /** | ||
510 | * If we have pending messages, ask the server to | ||
511 | * transmit them (schedule the respective tasks, etc.) | ||
512 | * | ||
513 | * @param session for which session should we do this | ||
514 | */ | ||
515 | static void process_pending_messages (struct Session *session); | ||
516 | |||
517 | |||
518 | /** | ||
519 | * Function called to notify a client about the socket | ||
520 | * begin ready to queue more data. "buf" will be | ||
521 | * NULL and "size" zero if the socket was closed for | ||
522 | * writing in the meantime. | ||
523 | * | ||
524 | * @param cls closure | ||
525 | * @param size number of bytes available in buf | ||
526 | * @param buf where the callee should write the message | ||
527 | * @return number of bytes written to buf | ||
528 | */ | ||
529 | static size_t | ||
530 | do_transmit (void *cls, size_t size, void *buf) | ||
531 | { | ||
532 | struct Session *session = cls; | ||
533 | struct PendingMessage *pm; | ||
534 | char *cbuf; | ||
535 | uint16_t msize; | ||
536 | size_t ret; | ||
537 | struct DataMessage *dm; | ||
538 | |||
539 | session->transmit_handle = NULL; | ||
540 | if (buf == NULL) | ||
541 | { | ||
542 | #if DEBUG_TCP | ||
543 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
544 | "tcp", "Timeout trying to transmit\n"); | ||
545 | #endif | ||
546 | /* timeout */ | ||
547 | while (NULL != (pm = session->pending_messages)) | ||
548 | { | ||
549 | session->pending_messages = pm->next; | ||
550 | if (pm->transmit_cont != NULL) | ||
551 | pm->transmit_cont (pm->transmit_cont_cls, | ||
552 | session->service_context, | ||
553 | &session->target, GNUNET_SYSERR); | ||
554 | GNUNET_free (pm); | ||
555 | } | ||
556 | return 0; | ||
557 | } | ||
558 | ret = 0; | ||
559 | cbuf = buf; | ||
560 | while (NULL != (pm = session->pending_messages)) | ||
561 | { | ||
562 | if (pm->is_welcome) | ||
563 | { | ||
564 | if (size < (msize = htons (pm->msg->size))) | ||
565 | break; | ||
566 | memcpy (cbuf, pm->msg, msize); | ||
567 | cbuf += msize; | ||
568 | ret += msize; | ||
569 | size -= msize; | ||
570 | } | ||
571 | else | ||
572 | { | ||
573 | if (size < | ||
574 | sizeof (struct DataMessage) + (msize = htons (pm->msg->size))) | ||
575 | break; | ||
576 | dm = (struct DataMessage *) cbuf; | ||
577 | dm->header.size = htons (sizeof (struct DataMessage) + msize); | ||
578 | dm->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_DATA); | ||
579 | dm->ack_out = GNUNET_htonll (++session->out_msg_counter); | ||
580 | dm->ack_in = GNUNET_htonll (session->max_in_msg_counter); | ||
581 | cbuf += sizeof (struct DataMessage); | ||
582 | ret += sizeof (struct DataMessage); | ||
583 | size -= sizeof (struct DataMessage); | ||
584 | memcpy (cbuf, pm->msg, msize); | ||
585 | cbuf += msize; | ||
586 | ret += msize; | ||
587 | size -= msize; | ||
588 | } | ||
589 | session->pending_messages = pm->next; | ||
590 | if (pm->transmit_cont != NULL) | ||
591 | pm->transmit_cont (pm->transmit_cont_cls, | ||
592 | session->service_context, | ||
593 | &session->target, GNUNET_OK); | ||
594 | GNUNET_free (pm); | ||
595 | session->gen_time[session->out_msg_counter % ACK_LOG_SIZE] | ||
596 | = GNUNET_TIME_absolute_get (); | ||
597 | } | ||
598 | process_pending_messages (session); | ||
599 | #if DEBUG_TCP || 1 | ||
600 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
601 | "tcp", "Transmitting %u bytes\n", ret); | ||
602 | #endif | ||
603 | return ret; | ||
604 | } | ||
605 | |||
606 | |||
607 | /** | ||
608 | * If we have pending messages, ask the server to | ||
609 | * transmit them (schedule the respective tasks, etc.) | ||
610 | * | ||
611 | * @param session for which session should we do this | ||
612 | */ | ||
613 | static void | ||
614 | process_pending_messages (struct Session *session) | ||
615 | { | ||
616 | GNUNET_assert (session->client != NULL); | ||
617 | if (session->pending_messages == NULL) | ||
618 | return; | ||
619 | if (session->transmit_handle != NULL) | ||
620 | return; | ||
621 | session->transmit_handle | ||
622 | = GNUNET_SERVER_notify_transmit_ready (session->client, | ||
623 | htons (session->pending_messages-> | ||
624 | msg->size) + | ||
625 | (session->pending_messages-> | ||
626 | is_welcome ? 0 : sizeof (struct | ||
627 | DataMessage)), | ||
628 | GNUNET_TIME_absolute_get_remaining | ||
629 | (session->pending_messages[0]. | ||
630 | timeout), &do_transmit, session); | ||
631 | } | ||
632 | |||
633 | |||
634 | /** | ||
635 | * Function that can be used by the transport service to transmit | ||
636 | * a message using the plugin using a fresh connection (even if | ||
637 | * we already have a connection to this peer, this function is | ||
638 | * required to establish a new one). | ||
639 | * | ||
640 | * @param cls closure | ||
641 | * @param target who should receive this message | ||
642 | * @param msg1 first message to transmit | ||
643 | * @param msg2 second message to transmit (can be NULL) | ||
644 | * @param timeout how long should we try to transmit these? | ||
645 | * @param addrlen length of the address | ||
646 | * @param addr the address | ||
647 | * @return session if the transmission has been scheduled | ||
648 | * NULL if the address format is invalid | ||
649 | */ | ||
650 | static void * | ||
651 | tcp_plugin_send_to (void *cls, | ||
652 | const struct GNUNET_PeerIdentity *target, | ||
653 | const struct GNUNET_MessageHeader *msg1, | ||
654 | const struct GNUNET_MessageHeader *msg2, | ||
655 | struct GNUNET_TIME_Relative timeout, | ||
656 | const void *addr, size_t addrlen) | ||
657 | { | ||
658 | struct Plugin *plugin = cls; | ||
659 | struct Session *session; | ||
660 | struct PendingMessage *pl; | ||
661 | struct PendingMessage *pm; | ||
662 | |||
663 | session = connect_and_create_session (plugin, target, addr, addrlen); | ||
664 | if (session == NULL) | ||
665 | { | ||
666 | #if DEBUG_TCP | ||
667 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
668 | "tcp", "Failed to create fresh session.\n"); | ||
669 | #endif | ||
670 | return NULL; | ||
671 | } | ||
672 | pl = NULL; | ||
673 | if (msg2 != NULL) | ||
674 | { | ||
675 | pm = GNUNET_malloc (sizeof (struct PendingMessage) + | ||
676 | ntohs (msg2->size)); | ||
677 | pm->msg = (struct GNUNET_MessageHeader *) &pm[1]; | ||
678 | memcpy (pm->msg, msg2, ntohs (msg2->size)); | ||
679 | pm->timeout = GNUNET_TIME_relative_to_absolute (timeout); | ||
680 | pm->is_welcome = GNUNET_NO; | ||
681 | pl = pm; | ||
682 | } | ||
683 | if (msg1 != NULL) | ||
684 | { | ||
685 | pm = GNUNET_malloc (sizeof (struct PendingMessage) + | ||
686 | ntohs (msg1->size)); | ||
687 | pm->msg = (struct GNUNET_MessageHeader *) &pm[1]; | ||
688 | memcpy (pm->msg, msg1, ntohs (msg1->size)); | ||
689 | pm->timeout = GNUNET_TIME_relative_to_absolute (timeout); | ||
690 | pm->is_welcome = GNUNET_NO; | ||
691 | pm->next = pl; | ||
692 | pl = pm; | ||
693 | } | ||
694 | /* append */ | ||
695 | if (session->pending_messages != NULL) | ||
696 | { | ||
697 | pm = session->pending_messages; | ||
698 | while (pm->next != NULL) | ||
699 | pm = pm->next; | ||
700 | pm->next = pl; | ||
701 | } | ||
702 | else | ||
703 | { | ||
704 | session->pending_messages = pl; | ||
705 | } | ||
706 | process_pending_messages (session); | ||
707 | return session; | ||
708 | } | ||
709 | |||
710 | |||
711 | /** | ||
712 | * Functions with this signature are called whenever we need | ||
713 | * to close a session due to a disconnect or failure to | ||
714 | * establish a connection. | ||
715 | * | ||
716 | * @param session session to close down | ||
717 | */ | ||
718 | static void | ||
719 | disconnect_session (struct Session *session) | ||
720 | { | ||
721 | struct Session *prev; | ||
722 | struct Session *pos; | ||
723 | struct PendingMessage *pm; | ||
724 | |||
725 | #if DEBUG_TCP | ||
726 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
727 | "tcp", | ||
728 | "Disconnecting from other peer (session %p).\n", session); | ||
729 | #endif | ||
730 | /* remove from session list */ | ||
731 | prev = NULL; | ||
732 | pos = session->plugin->sessions; | ||
733 | while (pos != session) | ||
734 | { | ||
735 | prev = pos; | ||
736 | pos = pos->next; | ||
737 | } | ||
738 | if (prev == NULL) | ||
739 | session->plugin->sessions = session->next; | ||
740 | else | ||
741 | prev->next = session->next; | ||
742 | /* clean up state */ | ||
743 | if (session->client != NULL) | ||
744 | { | ||
745 | #if DEBUG_TCP | ||
746 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
747 | "Disconnecting from client address %p\n", session->client); | ||
748 | #endif | ||
749 | GNUNET_SERVER_client_drop (session->client); | ||
750 | session->client = NULL; | ||
751 | } | ||
752 | if (session->transmit_handle != NULL) | ||
753 | { | ||
754 | GNUNET_NETWORK_notify_transmit_ready_cancel (session->transmit_handle); | ||
755 | session->transmit_handle = NULL; | ||
756 | } | ||
757 | while (NULL != (pm = session->pending_messages)) | ||
758 | { | ||
759 | session->pending_messages = pm->next; | ||
760 | if (NULL != pm->transmit_cont) | ||
761 | pm->transmit_cont (pm->transmit_cont_cls, | ||
762 | session->service_context, | ||
763 | &session->target, GNUNET_SYSERR); | ||
764 | GNUNET_free (pm); | ||
765 | } | ||
766 | /* notify transport service about disconnect */ | ||
767 | session->plugin->env->receive (session->plugin->env->cls, | ||
768 | session, | ||
769 | session->service_context, | ||
770 | GNUNET_TIME_UNIT_ZERO, | ||
771 | &session->target, NULL); | ||
772 | GNUNET_free_non_null (session->connect_addr); | ||
773 | GNUNET_free (session); | ||
774 | } | ||
775 | |||
776 | |||
777 | /** | ||
778 | * Iterator callback to go over all addresses. If we get | ||
779 | * a TCP address, increment the counter | ||
780 | * | ||
781 | * @param cls closure, points to the counter | ||
782 | * @param tname name of the transport | ||
783 | * @param expiration expiration time | ||
784 | * @param addr the address | ||
785 | * @param addrlen length of the address | ||
786 | * @return GNUNET_OK to keep the address, | ||
787 | * GNUNET_NO to delete it from the HELLO | ||
788 | * GNUNET_SYSERR to stop iterating (but keep current address) | ||
789 | */ | ||
790 | static int | ||
791 | count_tcp_addresses (void *cls, | ||
792 | const char *tname, | ||
793 | struct GNUNET_TIME_Absolute expiration, | ||
794 | const void *addr, size_t addrlen) | ||
795 | { | ||
796 | unsigned int *counter = cls; | ||
797 | |||
798 | if (0 != strcmp (tname, "tcp")) | ||
799 | return GNUNET_OK; /* not one of ours */ | ||
800 | (*counter)++; | ||
801 | return GNUNET_OK; /* failed to connect */ | ||
802 | } | ||
803 | |||
804 | |||
805 | struct ConnectContext | ||
806 | { | ||
807 | struct Plugin *plugin; | ||
808 | |||
809 | struct GNUNET_NETWORK_SocketHandle *sa; | ||
810 | |||
811 | struct PendingMessage *welcome; | ||
812 | |||
813 | unsigned int pos; | ||
814 | }; | ||
815 | |||
816 | |||
817 | /** | ||
818 | * Iterator callback to go over all addresses. If we get | ||
819 | * the "pos" TCP address, try to connect to it. | ||
820 | * | ||
821 | * @param cls closure | ||
822 | * @param tname name of the transport | ||
823 | * @param expiration expiration time | ||
824 | * @param addrlen length of the address | ||
825 | * @param addr the address | ||
826 | * @return GNUNET_OK to keep the address, | ||
827 | * GNUNET_NO to delete it from the HELLO | ||
828 | * GNUNET_SYSERR to stop iterating (but keep current address) | ||
829 | */ | ||
830 | static int | ||
831 | try_connect_to_address (void *cls, | ||
832 | const char *tname, | ||
833 | struct GNUNET_TIME_Absolute expiration, | ||
834 | const void *addr, size_t addrlen) | ||
835 | { | ||
836 | struct ConnectContext *cc = cls; | ||
837 | int af; | ||
838 | |||
839 | if (0 != strcmp (tname, "tcp")) | ||
840 | return GNUNET_OK; /* not one of ours */ | ||
841 | if (sizeof (struct sockaddr_in) == addrlen) | ||
842 | af = AF_INET; | ||
843 | else if (sizeof (struct sockaddr_in6) == addrlen) | ||
844 | af = AF_INET6; | ||
845 | else | ||
846 | { | ||
847 | /* not a valid address */ | ||
848 | GNUNET_break (0); | ||
849 | return GNUNET_NO; | ||
850 | } | ||
851 | if (0 == cc->pos--) | ||
852 | { | ||
853 | cc->welcome = create_welcome (addrlen, addr, cc->plugin); | ||
854 | cc->sa = | ||
855 | GNUNET_NETWORK_socket_create_from_sockaddr (cc->plugin->env->sched, | ||
856 | af, addr, addrlen, | ||
857 | GNUNET_SERVER_MAX_MESSAGE_SIZE); | ||
858 | #if DEBUG_TCP | ||
859 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
860 | "tcp", "Connected to other peer.\n"); | ||
861 | #endif | ||
862 | return GNUNET_SYSERR; | ||
863 | } | ||
864 | return GNUNET_OK; /* failed to connect */ | ||
865 | } | ||
866 | |||
867 | |||
868 | /** | ||
869 | * Type of an iterator over the hosts. Note that each | ||
870 | * host will be called with each available protocol. | ||
871 | * | ||
872 | * @param cls closure | ||
873 | * @param peer id of the peer, NULL for last call | ||
874 | * @param hello hello message for the peer (can be NULL) | ||
875 | * @param trust amount of trust we have in the peer | ||
876 | */ | ||
877 | static void | ||
878 | session_try_connect (void *cls, | ||
879 | const struct GNUNET_PeerIdentity *peer, | ||
880 | const struct GNUNET_HELLO_Message *hello, uint32_t trust) | ||
881 | { | ||
882 | struct Session *session = cls; | ||
883 | unsigned int count; | ||
884 | struct ConnectContext cctx; | ||
885 | struct PendingMessage *pm; | ||
886 | |||
887 | if (peer == NULL) | ||
888 | { | ||
889 | /* last call, destroy session if we are still not | ||
890 | connected */ | ||
891 | if (session->still_connecting == GNUNET_NO) | ||
892 | { | ||
893 | #if DEBUG_TCP | ||
894 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
895 | "tcp", | ||
896 | "Connected to other peer, now processing messages.\n"); | ||
897 | #endif | ||
898 | process_pending_messages (session); | ||
899 | } | ||
900 | else | ||
901 | { | ||
902 | #if DEBUG_TCP | ||
903 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
904 | "tcp", | ||
905 | "Failed to connect to other peer, now closing session.\n"); | ||
906 | #endif | ||
907 | disconnect_session (session); | ||
908 | } | ||
909 | return; | ||
910 | } | ||
911 | if ((hello == NULL) || (session->client != NULL)) | ||
912 | { | ||
913 | GNUNET_break (0); /* should this ever happen!? */ | ||
914 | return; | ||
915 | } | ||
916 | count = 0; | ||
917 | GNUNET_HELLO_iterate_addresses (hello, | ||
918 | GNUNET_NO, &count_tcp_addresses, &count); | ||
919 | if (count == 0) | ||
920 | { | ||
921 | #if DEBUG_TCP | ||
922 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
923 | "tcp", | ||
924 | "Asked to connect, but have no addresses to try.\n"); | ||
925 | #endif | ||
926 | return; | ||
927 | } | ||
928 | cctx.plugin = session->plugin; | ||
929 | cctx.sa = NULL; | ||
930 | cctx.welcome = NULL; | ||
931 | cctx.pos = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, count); | ||
932 | GNUNET_HELLO_iterate_addresses (hello, | ||
933 | GNUNET_NO, &try_connect_to_address, &cctx); | ||
934 | if (cctx.sa == NULL) | ||
935 | { | ||
936 | #if DEBUG_TCP | ||
937 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
938 | "tcp", | ||
939 | "Asked to connect, but all addresses failed.\n"); | ||
940 | #endif | ||
941 | GNUNET_free_non_null (cctx.welcome); | ||
942 | return; | ||
943 | } | ||
944 | session->client = GNUNET_SERVER_connect_socket (session->plugin->server, | ||
945 | cctx.sa); | ||
946 | #if DEBUG_TCP | ||
947 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
948 | "Connected getting client address %p\n", session->client); | ||
949 | #endif | ||
950 | if (session->client == NULL) | ||
951 | { | ||
952 | GNUNET_break (0); /* how could this happen? */ | ||
953 | GNUNET_free_non_null (cctx.welcome); | ||
954 | return; | ||
955 | } | ||
956 | pm = cctx.welcome; | ||
957 | /* prepend (!) */ | ||
958 | pm->next = session->pending_messages; | ||
959 | session->pending_messages = pm; | ||
960 | session->still_connecting = GNUNET_NO; | ||
961 | #if DEBUG_TCP | ||
962 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
963 | "tcp", | ||
964 | "Connected to other peer, now sending `%s' message.\n", | ||
965 | "WELCOME"); | ||
966 | #endif | ||
967 | } | ||
968 | |||
969 | |||
970 | /** | ||
971 | * Function that can be used by the transport service to transmit | ||
972 | * a message using the plugin. | ||
973 | * | ||
974 | * @param cls closure | ||
975 | * @param plugin_context value we were asked to pass to this plugin | ||
976 | * to respond to the given peer (use is optional, | ||
977 | * but may speed up processing), can be NULL | ||
978 | * @param service_context value passed to the transport-service | ||
979 | * to identify the neighbour | ||
980 | * @param target who should receive this message | ||
981 | * @param msg the message to transmit | ||
982 | * @param cont continuation to call once the message has | ||
983 | * been transmitted (or if the transport is ready | ||
984 | * for the next transmission call; or if the | ||
985 | * peer disconnected...) | ||
986 | * @param cont_cls closure for cont | ||
987 | * @return plugin_context that should be used next time for | ||
988 | * sending messages to the specified peer | ||
989 | */ | ||
990 | static void * | ||
991 | tcp_plugin_send (void *cls, | ||
992 | void *plugin_context, | ||
993 | struct ReadyList *service_context, | ||
994 | const struct GNUNET_PeerIdentity *target, | ||
995 | const struct GNUNET_MessageHeader *msg, | ||
996 | struct GNUNET_TIME_Relative timeout, | ||
997 | GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls) | ||
998 | { | ||
999 | struct Plugin *plugin = cls; | ||
1000 | struct Session *session = plugin_context; | ||
1001 | struct PendingMessage *pm; | ||
1002 | struct PendingMessage *pme; | ||
1003 | |||
1004 | if (session == NULL) | ||
1005 | session = find_session_by_target (plugin, target); | ||
1006 | pm = GNUNET_malloc (sizeof (struct PendingMessage) + ntohs (msg->size)); | ||
1007 | pm->msg = (struct GNUNET_MessageHeader *) &pm[1]; | ||
1008 | memcpy (pm->msg, msg, ntohs (msg->size)); | ||
1009 | pm->timeout = GNUNET_TIME_relative_to_absolute (timeout); | ||
1010 | pm->transmit_cont = cont; | ||
1011 | pm->transmit_cont_cls = cont_cls; | ||
1012 | if (session == NULL) | ||
1013 | { | ||
1014 | session = GNUNET_malloc (sizeof (struct Session)); | ||
1015 | #if DEBUG_TCP | ||
1016 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
1017 | "tcp", | ||
1018 | "Asked to transmit, creating fresh session %p.\n", | ||
1019 | session); | ||
1020 | #endif | ||
1021 | session->next = plugin->sessions; | ||
1022 | plugin->sessions = session; | ||
1023 | session->plugin = plugin; | ||
1024 | session->target = *target; | ||
1025 | session->last_quota_update = GNUNET_TIME_absolute_get (); | ||
1026 | session->quota_in = plugin->env->default_quota_in; | ||
1027 | session->expecting_welcome = GNUNET_YES; | ||
1028 | session->still_connecting = GNUNET_YES; | ||
1029 | session->pending_messages = pm; | ||
1030 | GNUNET_PEERINFO_for_all (plugin->env->cfg, | ||
1031 | plugin->env->sched, | ||
1032 | target, | ||
1033 | 0, timeout, &session_try_connect, session); | ||
1034 | return session; | ||
1035 | } | ||
1036 | GNUNET_assert (session != NULL); | ||
1037 | GNUNET_assert (session->still_connecting == GNUNET_NO); | ||
1038 | /* append pm to pending_messages list */ | ||
1039 | pme = session->pending_messages; | ||
1040 | if (pme == NULL) | ||
1041 | { | ||
1042 | session->pending_messages = pm; | ||
1043 | } | ||
1044 | else | ||
1045 | { | ||
1046 | while (NULL != pme->next) | ||
1047 | pme = pme->next; | ||
1048 | pme->next = pm; | ||
1049 | } | ||
1050 | #if DEBUG_TCP | ||
1051 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
1052 | "tcp", "Asked to transmit, added message to list.\n"); | ||
1053 | #endif | ||
1054 | process_pending_messages (session); | ||
1055 | return session; | ||
1056 | } | ||
1057 | |||
1058 | |||
1059 | |||
1060 | /** | ||
1061 | * Function that can be called to force a disconnect from the | ||
1062 | * specified neighbour. This should also cancel all previously | ||
1063 | * scheduled transmissions. Obviously the transmission may have been | ||
1064 | * partially completed already, which is OK. The plugin is supposed | ||
1065 | * to close the connection (if applicable) and no longer call the | ||
1066 | * transmit continuation(s). | ||
1067 | * | ||
1068 | * Finally, plugin MUST NOT call the services's receive function to | ||
1069 | * notify the service that the connection to the specified target was | ||
1070 | * closed after a getting this call. | ||
1071 | * | ||
1072 | * @param cls closure | ||
1073 | * @param plugin_context value we were asked to pass to this plugin | ||
1074 | * to respond to the given peer (use is optional, | ||
1075 | * but may speed up processing), can be NULL (if | ||
1076 | * NULL was returned from the transmit function) | ||
1077 | * @param service_context must correspond to the service context | ||
1078 | * of the corresponding Transmit call; the plugin should | ||
1079 | * not cancel a send call made with a different service | ||
1080 | * context pointer! Never NULL. | ||
1081 | * @param target peer for which the last transmission is | ||
1082 | * to be cancelled | ||
1083 | */ | ||
1084 | static void | ||
1085 | tcp_plugin_cancel (void *cls, | ||
1086 | void *plugin_context, | ||
1087 | struct ReadyList *service_context, | ||
1088 | const struct GNUNET_PeerIdentity *target) | ||
1089 | { | ||
1090 | struct Plugin *plugin = cls; | ||
1091 | struct PendingMessage *pm; | ||
1092 | struct Session *session; | ||
1093 | struct Session *next; | ||
1094 | |||
1095 | session = plugin->sessions; | ||
1096 | while (session != NULL) | ||
1097 | { | ||
1098 | next = session->next; | ||
1099 | if (0 == memcmp (target, | ||
1100 | &session->target, sizeof (struct GNUNET_PeerIdentity))) | ||
1101 | { | ||
1102 | pm = session->pending_messages; | ||
1103 | while (pm != NULL) | ||
1104 | { | ||
1105 | pm->transmit_cont = NULL; | ||
1106 | pm->transmit_cont_cls = NULL; | ||
1107 | pm = pm->next; | ||
1108 | } | ||
1109 | session->service_context = NULL; | ||
1110 | GNUNET_SERVER_client_disconnect (session->client); | ||
1111 | /* rest of the clean-up of the session will be done as part of | ||
1112 | disconnect_notify which should be triggered any time now */ | ||
1113 | } | ||
1114 | session = next; | ||
1115 | } | ||
1116 | } | ||
1117 | |||
1118 | |||
1119 | struct PrettyPrinterContext | ||
1120 | { | ||
1121 | GNUNET_TRANSPORT_AddressStringCallback asc; | ||
1122 | void *asc_cls; | ||
1123 | uint16_t port; | ||
1124 | }; | ||
1125 | |||
1126 | |||
1127 | /** | ||
1128 | * Append our port and forward the result. | ||
1129 | */ | ||
1130 | static void | ||
1131 | append_port (void *cls, const char *hostname) | ||
1132 | { | ||
1133 | struct PrettyPrinterContext *ppc = cls; | ||
1134 | char *ret; | ||
1135 | |||
1136 | if (hostname == NULL) | ||
1137 | { | ||
1138 | ppc->asc (ppc->asc_cls, NULL); | ||
1139 | GNUNET_free (ppc); | ||
1140 | return; | ||
1141 | } | ||
1142 | GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port); | ||
1143 | ppc->asc (ppc->asc_cls, ret); | ||
1144 | GNUNET_free (ret); | ||
1145 | } | ||
1146 | |||
1147 | |||
1148 | /** | ||
1149 | * Convert the transports address to a nice, human-readable | ||
1150 | * format. | ||
1151 | * | ||
1152 | * @param cls closure | ||
1153 | * @param name name of the transport that generated the address | ||
1154 | * @param addr one of the addresses of the host, NULL for the last address | ||
1155 | * the specific address format depends on the transport | ||
1156 | * @param addrlen length of the address | ||
1157 | * @param numeric should (IP) addresses be displayed in numeric form? | ||
1158 | * @param timeout after how long should we give up? | ||
1159 | * @param asc function to call on each string | ||
1160 | * @param asc_cls closure for asc | ||
1161 | */ | ||
1162 | static void | ||
1163 | tcp_plugin_address_pretty_printer (void *cls, | ||
1164 | const char *type, | ||
1165 | const void *addr, | ||
1166 | size_t addrlen, | ||
1167 | int numeric, | ||
1168 | struct GNUNET_TIME_Relative timeout, | ||
1169 | GNUNET_TRANSPORT_AddressStringCallback asc, | ||
1170 | void *asc_cls) | ||
1171 | { | ||
1172 | struct Plugin *plugin = cls; | ||
1173 | const struct sockaddr_in *v4; | ||
1174 | const struct sockaddr_in6 *v6; | ||
1175 | struct PrettyPrinterContext *ppc; | ||
1176 | |||
1177 | if ((addrlen != sizeof (struct sockaddr_in)) && | ||
1178 | (addrlen != sizeof (struct sockaddr_in6))) | ||
1179 | { | ||
1180 | /* invalid address */ | ||
1181 | GNUNET_break_op (0); | ||
1182 | asc (asc_cls, NULL); | ||
1183 | return; | ||
1184 | } | ||
1185 | ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext)); | ||
1186 | ppc->asc = asc; | ||
1187 | ppc->asc_cls = asc_cls; | ||
1188 | if (addrlen == sizeof (struct sockaddr_in)) | ||
1189 | { | ||
1190 | v4 = (const struct sockaddr_in *) addr; | ||
1191 | ppc->port = ntohs (v4->sin_port); | ||
1192 | } | ||
1193 | else | ||
1194 | { | ||
1195 | v6 = (const struct sockaddr_in6 *) addr; | ||
1196 | ppc->port = ntohs (v6->sin6_port); | ||
1197 | |||
1198 | } | ||
1199 | GNUNET_RESOLVER_hostname_get (plugin->env->sched, | ||
1200 | plugin->env->cfg, | ||
1201 | addr, | ||
1202 | addrlen, | ||
1203 | !numeric, timeout, &append_port, ppc); | ||
1204 | } | ||
1205 | |||
1206 | |||
1207 | /** | ||
1208 | * Update the last-received and bandwidth quota values | ||
1209 | * for this session. | ||
1210 | * | ||
1211 | * @param session session to update | ||
1212 | * @param force set to GNUNET_YES if we should update even | ||
1213 | * though the minimum refresh time has not yet expired | ||
1214 | */ | ||
1215 | static void | ||
1216 | update_quota (struct Session *session, int force) | ||
1217 | { | ||
1218 | struct GNUNET_TIME_Absolute now; | ||
1219 | unsigned long long delta; | ||
1220 | unsigned long long total_allowed; | ||
1221 | unsigned long long total_remaining; | ||
1222 | |||
1223 | now = GNUNET_TIME_absolute_get (); | ||
1224 | delta = now.value - session->last_quota_update.value; | ||
1225 | if ((delta < MIN_QUOTA_REFRESH_TIME) && (!force)) | ||
1226 | return; /* too early, not enough data */ | ||
1227 | |||
1228 | total_allowed = session->quota_in * delta; | ||
1229 | if (total_allowed > session->last_received) | ||
1230 | { | ||
1231 | /* got less than acceptable */ | ||
1232 | total_remaining = total_allowed - session->last_received; | ||
1233 | session->last_received = 0; | ||
1234 | delta = total_remaining / session->quota_in; /* bonus seconds */ | ||
1235 | if (delta > MAX_BANDWIDTH_CARRY) | ||
1236 | delta = MAX_BANDWIDTH_CARRY; /* limit amount of carry-over */ | ||
1237 | } | ||
1238 | else | ||
1239 | { | ||
1240 | /* got more than acceptable */ | ||
1241 | total_remaining = 0; | ||
1242 | session->last_received -= total_allowed; | ||
1243 | delta = 0; | ||
1244 | } | ||
1245 | session->last_quota_update.value = now.value - delta; | ||
1246 | } | ||
1247 | |||
1248 | |||
1249 | /** | ||
1250 | * Set a quota for receiving data from the given peer; this is a | ||
1251 | * per-transport limit. The transport should limit its read/select | ||
1252 | * calls to stay below the quota (in terms of incoming data). | ||
1253 | * | ||
1254 | * @param cls closure | ||
1255 | * @param peer the peer for whom the quota is given | ||
1256 | * @param quota_in quota for receiving/sending data in bytes per ms | ||
1257 | */ | ||
1258 | static void | ||
1259 | tcp_plugin_set_receive_quota (void *cls, | ||
1260 | const struct GNUNET_PeerIdentity *target, | ||
1261 | uint32_t quota_in) | ||
1262 | { | ||
1263 | struct Plugin *plugin = cls; | ||
1264 | struct Session *session; | ||
1265 | |||
1266 | session = find_session_by_target (plugin, target); | ||
1267 | if (session->quota_in != quota_in) | ||
1268 | { | ||
1269 | update_quota (session, GNUNET_YES); | ||
1270 | if (session->quota_in > quota_in) | ||
1271 | session->last_quota_update = GNUNET_TIME_absolute_get (); | ||
1272 | session->quota_in = quota_in; | ||
1273 | } | ||
1274 | } | ||
1275 | |||
1276 | |||
1277 | /** | ||
1278 | * Check if the given port is plausible (must be either | ||
1279 | * our listen port or our advertised port). If it is | ||
1280 | * neither, we return one of these two ports at random. | ||
1281 | * | ||
1282 | * @return either in_port or a more plausible port | ||
1283 | */ | ||
1284 | static uint16_t | ||
1285 | check_port (struct Plugin *plugin, uint16_t in_port) | ||
1286 | { | ||
1287 | if ((in_port == plugin->adv_port) || (in_port == plugin->open_port)) | ||
1288 | return in_port; | ||
1289 | return (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, | ||
1290 | 2) == 0) | ||
1291 | ? plugin->open_port : plugin->adv_port; | ||
1292 | } | ||
1293 | |||
1294 | |||
1295 | /** | ||
1296 | * Another peer has suggested an address for this | ||
1297 | * peer and transport plugin. Check that this could be a valid | ||
1298 | * address. If so, consider adding it to the list | ||
1299 | * of addresses. | ||
1300 | * | ||
1301 | * @param cls closure | ||
1302 | * @param addr pointer to the address | ||
1303 | * @param addrlen length of addr | ||
1304 | * @return GNUNET_OK if this is a plausible address for this peer | ||
1305 | * and transport | ||
1306 | */ | ||
1307 | static int | ||
1308 | tcp_plugin_address_suggested (void *cls, const void *addr, size_t addrlen) | ||
1309 | { | ||
1310 | struct Plugin *plugin = cls; | ||
1311 | char buf[sizeof (struct sockaddr_in6)]; | ||
1312 | struct sockaddr_in *v4; | ||
1313 | struct sockaddr_in6 *v6; | ||
1314 | char dst[INET6_ADDRSTRLEN]; | ||
1315 | uint16_t port; | ||
1316 | |||
1317 | if ((addrlen != sizeof (struct sockaddr_in)) && | ||
1318 | (addrlen != sizeof (struct sockaddr_in6))) | ||
1319 | { | ||
1320 | GNUNET_break_op (0); | ||
1321 | return GNUNET_SYSERR; | ||
1322 | } | ||
1323 | memcpy (buf, addr, sizeof (struct sockaddr_in6)); | ||
1324 | if (addrlen == sizeof (struct sockaddr_in)) | ||
1325 | { | ||
1326 | v4 = (struct sockaddr_in *) buf; | ||
1327 | v4->sin_port = htons (check_port (plugin, ntohs (v4->sin_port))); | ||
1328 | inet_ntop (AF_INET, &v4->sin_addr, dst, sizeof (dst)); | ||
1329 | port = ntohs (v4->sin_port); | ||
1330 | } | ||
1331 | else | ||
1332 | { | ||
1333 | v6 = (struct sockaddr_in6 *) buf; | ||
1334 | v6->sin6_port = htons (check_port (plugin, ntohs (v6->sin6_port))); | ||
1335 | inet_ntop (AF_INET6, &v6->sin6_addr, dst, sizeof (dst)); | ||
1336 | port = ntohs (v6->sin6_port); | ||
1337 | } | ||
1338 | #if DEBUG_TCP | ||
1339 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
1340 | "tcp", | ||
1341 | "Informing transport service about my address `%s:%u'.\n", | ||
1342 | dst, port); | ||
1343 | #endif | ||
1344 | plugin->env->notify_address (plugin->env->cls, | ||
1345 | "tcp", | ||
1346 | buf, addrlen, LEARNED_ADDRESS_EXPIRATION); | ||
1347 | return GNUNET_OK; | ||
1348 | } | ||
1349 | |||
1350 | |||
1351 | /** | ||
1352 | * We've received a welcome from this peer via TCP. | ||
1353 | * Possibly create a fresh client record and send back | ||
1354 | * our welcome. | ||
1355 | * | ||
1356 | * @param cls closure | ||
1357 | * @param server the server handling the message | ||
1358 | * @param client identification of the client | ||
1359 | * @param message the actual message | ||
1360 | */ | ||
1361 | static void | ||
1362 | handle_tcp_welcome (void *cls, | ||
1363 | struct GNUNET_SERVER_Handle *server, | ||
1364 | struct GNUNET_SERVER_Client *client, | ||
1365 | const struct GNUNET_MessageHeader *message) | ||
1366 | { | ||
1367 | struct Plugin *plugin = cls; | ||
1368 | struct Session *session_c; | ||
1369 | const struct WelcomeMessage *wm; | ||
1370 | uint16_t msize; | ||
1371 | uint32_t addrlen; | ||
1372 | size_t alen; | ||
1373 | void *vaddr; | ||
1374 | const struct sockaddr *addr; | ||
1375 | |||
1376 | #if DEBUG_TCP | ||
1377 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
1378 | "tcp", | ||
1379 | "Received `%s' message from %p.\n", "WELCOME", client); | ||
1380 | #endif | ||
1381 | msize = ntohs (message->size); | ||
1382 | if (msize < sizeof (struct WelcomeMessage)) | ||
1383 | { | ||
1384 | GNUNET_break_op (0); | ||
1385 | GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); | ||
1386 | return; | ||
1387 | } | ||
1388 | wm = (const struct WelcomeMessage *) message; | ||
1389 | session_c = find_session_by_client (plugin, client); | ||
1390 | if (session_c == NULL) | ||
1391 | { | ||
1392 | vaddr = NULL; | ||
1393 | GNUNET_SERVER_client_get_address (client, &vaddr, &alen); | ||
1394 | GNUNET_SERVER_client_keep (client); | ||
1395 | session_c = create_session (plugin, | ||
1396 | &wm->clientIdentity, client, vaddr, alen); | ||
1397 | #if DEBUG_TCP | ||
1398 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
1399 | "tcp", | ||
1400 | "Creating new session %p for incoming `%s' message.\n", | ||
1401 | session_c, "WELCOME"); | ||
1402 | #endif | ||
1403 | GNUNET_free_non_null (vaddr); | ||
1404 | process_pending_messages (session_c); | ||
1405 | } | ||
1406 | session_c->expecting_welcome = GNUNET_NO; | ||
1407 | if (0 < (addrlen = msize - sizeof (struct WelcomeMessage))) | ||
1408 | { | ||
1409 | addr = (const struct sockaddr *) &wm[1]; | ||
1410 | tcp_plugin_address_suggested (plugin, addr, addrlen); | ||
1411 | } | ||
1412 | GNUNET_SERVER_receive_done (client, GNUNET_OK); | ||
1413 | } | ||
1414 | |||
1415 | |||
1416 | /** | ||
1417 | * Calculate how long we should delay reading from the TCP socket to | ||
1418 | * ensure that we stay within our bandwidth limits (push back). | ||
1419 | * | ||
1420 | * @param session for which client should this be calculated | ||
1421 | */ | ||
1422 | static struct GNUNET_TIME_Relative | ||
1423 | calculate_throttle_delay (struct Session *session) | ||
1424 | { | ||
1425 | struct GNUNET_TIME_Relative ret; | ||
1426 | struct GNUNET_TIME_Absolute now; | ||
1427 | uint64_t del; | ||
1428 | uint64_t avail; | ||
1429 | uint64_t excess; | ||
1430 | |||
1431 | now = GNUNET_TIME_absolute_get (); | ||
1432 | del = now.value - session->last_quota_update.value; | ||
1433 | if (del > MAX_BANDWIDTH_CARRY) | ||
1434 | { | ||
1435 | update_quota (session, GNUNET_YES); | ||
1436 | del = now.value - session->last_quota_update.value; | ||
1437 | GNUNET_assert (del <= MAX_BANDWIDTH_CARRY); | ||
1438 | } | ||
1439 | if (session->quota_in == 0) | ||
1440 | session->quota_in = 1; /* avoid divison by zero */ | ||
1441 | avail = del * session->quota_in; | ||
1442 | if (avail > session->last_received) | ||
1443 | return GNUNET_TIME_UNIT_ZERO; /* can receive right now */ | ||
1444 | excess = session->last_received - avail; | ||
1445 | ret.value = excess / session->quota_in; | ||
1446 | return ret; | ||
1447 | } | ||
1448 | |||
1449 | |||
1450 | /** | ||
1451 | * Task to signal the server that we can continue | ||
1452 | * receiving from the TCP client now. | ||
1453 | */ | ||
1454 | static void | ||
1455 | delayed_done (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) | ||
1456 | { | ||
1457 | struct Session *session = cls; | ||
1458 | GNUNET_SERVER_receive_done (session->client, GNUNET_OK); | ||
1459 | } | ||
1460 | |||
1461 | |||
1462 | /** | ||
1463 | * We've received data for this peer via TCP. Unbox, | ||
1464 | * compute latency and forward. | ||
1465 | * | ||
1466 | * @param cls closure | ||
1467 | * @param server the server handling the message | ||
1468 | * @param client identification of the client | ||
1469 | * @param message the actual message | ||
1470 | */ | ||
1471 | static void | ||
1472 | handle_tcp_data (void *cls, | ||
1473 | struct GNUNET_SERVER_Handle *server, | ||
1474 | struct GNUNET_SERVER_Client *client, | ||
1475 | const struct GNUNET_MessageHeader *message) | ||
1476 | { | ||
1477 | struct Plugin *plugin = cls; | ||
1478 | struct Session *session; | ||
1479 | const struct DataMessage *dm; | ||
1480 | uint16_t msize; | ||
1481 | const struct GNUNET_MessageHeader *msg; | ||
1482 | struct GNUNET_TIME_Relative latency; | ||
1483 | struct GNUNET_TIME_Absolute ttime; | ||
1484 | struct GNUNET_TIME_Absolute now; | ||
1485 | struct GNUNET_TIME_Relative delay; | ||
1486 | uint64_t ack_in; | ||
1487 | |||
1488 | #if DEBUG_TCP | ||
1489 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
1490 | "tcp", "Receiving data from other peer.\n"); | ||
1491 | #endif | ||
1492 | msize = ntohs (message->size); | ||
1493 | if ((msize < | ||
1494 | sizeof (struct DataMessage) + sizeof (struct GNUNET_MessageHeader))) | ||
1495 | { | ||
1496 | GNUNET_break_op (0); | ||
1497 | GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); | ||
1498 | return; | ||
1499 | } | ||
1500 | session = find_session_by_client (plugin, client); | ||
1501 | if ((NULL == session) || (GNUNET_YES == session->expecting_welcome)) | ||
1502 | { | ||
1503 | GNUNET_break_op (0); | ||
1504 | GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); | ||
1505 | return; | ||
1506 | } | ||
1507 | dm = (const struct DataMessage *) message; | ||
1508 | session->max_in_msg_counter = GNUNET_MAX (session->max_in_msg_counter, | ||
1509 | GNUNET_ntohll (dm->ack_out)); | ||
1510 | msg = (const struct GNUNET_MessageHeader *) &dm[1]; | ||
1511 | if (msize != sizeof (struct DataMessage) + ntohs (msg->size)) | ||
1512 | { | ||
1513 | GNUNET_break_op (0); | ||
1514 | GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); | ||
1515 | return; | ||
1516 | } | ||
1517 | /* estimate latency */ | ||
1518 | ack_in = GNUNET_ntohll (dm->ack_in); | ||
1519 | if ((ack_in <= session->out_msg_counter) && | ||
1520 | (session->out_msg_counter - ack_in < ACK_LOG_SIZE)) | ||
1521 | { | ||
1522 | delay = GNUNET_TIME_relative_ntoh (dm->delay); | ||
1523 | ttime = session->gen_time[ack_in % ACK_LOG_SIZE]; | ||
1524 | now = GNUNET_TIME_absolute_get (); | ||
1525 | if (delay.value > now.value - ttime.value) | ||
1526 | delay.value = 0; /* not plausible */ | ||
1527 | /* update (round-trip) latency using ageing; we | ||
1528 | use 7:1 so that we can reasonably quickly react | ||
1529 | to changes, but not so fast that latency is largely | ||
1530 | jitter... */ | ||
1531 | session->latency_estimate | ||
1532 | = ((7 * session->latency_estimate) + | ||
1533 | (now.value - ttime.value - delay.value)) / 8; | ||
1534 | } | ||
1535 | latency.value = (uint64_t) session->latency_estimate; | ||
1536 | /* deliver on */ | ||
1537 | #if DEBUG_TCP | ||
1538 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
1539 | "tcp", | ||
1540 | "Forwarding data of type %u to transport service.\n", | ||
1541 | ntohs (msg->type)); | ||
1542 | #endif | ||
1543 | session->service_context | ||
1544 | = plugin->env->receive (plugin->env->cls, | ||
1545 | session, | ||
1546 | session->service_context, | ||
1547 | latency, &session->target, msg); | ||
1548 | /* update bandwidth used */ | ||
1549 | session->last_received += msize; | ||
1550 | update_quota (session, GNUNET_NO); | ||
1551 | |||
1552 | delay = calculate_throttle_delay (session); | ||
1553 | if (delay.value == 0) | ||
1554 | GNUNET_SERVER_receive_done (client, GNUNET_OK); | ||
1555 | else | ||
1556 | GNUNET_SCHEDULER_add_delayed (session->plugin->env->sched, | ||
1557 | GNUNET_NO, | ||
1558 | GNUNET_SCHEDULER_PRIORITY_HIGH, | ||
1559 | GNUNET_SCHEDULER_NO_PREREQUISITE_TASK, | ||
1560 | delay, &delayed_done, session); | ||
1561 | } | ||
1562 | |||
1563 | |||
1564 | /** | ||
1565 | * Handlers for the various TCP messages. | ||
1566 | */ | ||
1567 | static struct GNUNET_SERVER_MessageHandler my_handlers[] = { | ||
1568 | {&handle_tcp_welcome, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME, 0}, | ||
1569 | {&handle_tcp_data, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_DATA, 0}, | ||
1570 | {NULL, NULL, 0, 0} | ||
1571 | }; | ||
1572 | |||
1573 | |||
1574 | static void | ||
1575 | create_tcp_handlers (struct Plugin *plugin) | ||
1576 | { | ||
1577 | unsigned int i; | ||
1578 | plugin->handlers = GNUNET_malloc (sizeof (my_handlers)); | ||
1579 | memcpy (plugin->handlers, my_handlers, sizeof (my_handlers)); | ||
1580 | for (i = 0; | ||
1581 | i < | ||
1582 | sizeof (my_handlers) / sizeof (struct GNUNET_SERVER_MessageHandler); | ||
1583 | i++) | ||
1584 | plugin->handlers[i].callback_cls = plugin; | ||
1585 | GNUNET_SERVER_add_handlers (plugin->server, plugin->handlers); | ||
1586 | } | ||
1587 | |||
1588 | |||
1589 | /** | ||
1590 | * Functions with this signature are called whenever a peer | ||
1591 | * is disconnected on the network level. | ||
1592 | * | ||
1593 | * @param cls closure | ||
1594 | * @param client identification of the client | ||
1595 | */ | ||
1596 | static void | ||
1597 | disconnect_notify (void *cls, struct GNUNET_SERVER_Client *client) | ||
1598 | { | ||
1599 | struct Plugin *plugin = cls; | ||
1600 | struct Session *session; | ||
1601 | |||
1602 | #if DEBUG_TCP | ||
1603 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
1604 | "tcp", | ||
1605 | "Notified about network-level disconnect of client %p.\n", | ||
1606 | client); | ||
1607 | #endif | ||
1608 | session = find_session_by_client (plugin, client); | ||
1609 | if (session == NULL) | ||
1610 | return; /* unknown, nothing to do */ | ||
1611 | #if DEBUG_TCP | ||
1612 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
1613 | "tcp", "Will now destroy session %p.\n", session); | ||
1614 | #endif | ||
1615 | disconnect_session (session); | ||
1616 | } | ||
1617 | |||
1618 | |||
1619 | /** | ||
1620 | * Add the IP of our network interface to the list of | ||
1621 | * our external IP addresses. | ||
1622 | */ | ||
1623 | static int | ||
1624 | process_interfaces (void *cls, | ||
1625 | const char *name, | ||
1626 | int isDefault, | ||
1627 | const struct sockaddr *addr, socklen_t addrlen) | ||
1628 | { | ||
1629 | struct Plugin *plugin = cls; | ||
1630 | char dst[INET6_ADDRSTRLEN]; | ||
1631 | int af; | ||
1632 | struct sockaddr_in *v4; | ||
1633 | struct sockaddr_in6 *v6; | ||
1634 | |||
1635 | af = addr->sa_family; | ||
1636 | if (af == AF_INET) | ||
1637 | { | ||
1638 | v4 = (struct sockaddr_in *) addr; | ||
1639 | inet_ntop (AF_INET, &v4->sin_addr, dst, sizeof (dst)); | ||
1640 | v4->sin_port = htons (plugin->adv_port); | ||
1641 | } | ||
1642 | else | ||
1643 | { | ||
1644 | GNUNET_assert (af == AF_INET6); | ||
1645 | v6 = (struct sockaddr_in6 *) addr; | ||
1646 | inet_ntop (AF_INET6, &v6->sin6_addr, dst, sizeof (dst)); | ||
1647 | v6->sin6_port = htons (plugin->adv_port); | ||
1648 | } | ||
1649 | GNUNET_log_from (GNUNET_ERROR_TYPE_INFO | | ||
1650 | GNUNET_ERROR_TYPE_BULK, | ||
1651 | "tcp", _("Found address `%s' (%s)\n"), dst, name); | ||
1652 | plugin->env->notify_address (plugin->env->cls, | ||
1653 | "tcp", | ||
1654 | addr, addrlen, GNUNET_TIME_UNIT_FOREVER_REL); | ||
1655 | return GNUNET_OK; | ||
1656 | } | ||
1657 | |||
1658 | |||
1659 | /** | ||
1660 | * Function called by the resolver for each address obtained from DNS | ||
1661 | * for our own hostname. Add the addresses to the list of our | ||
1662 | * external IP addresses. | ||
1663 | * | ||
1664 | * @param cls closure | ||
1665 | * @param addr one of the addresses of the host, NULL for the last address | ||
1666 | * @param addrlen length of the address | ||
1667 | */ | ||
1668 | static void | ||
1669 | process_hostname_ips (void *cls, | ||
1670 | const struct sockaddr *addr, socklen_t addrlen) | ||
1671 | { | ||
1672 | struct Plugin *plugin = cls; | ||
1673 | |||
1674 | if (addr == NULL) | ||
1675 | return; | ||
1676 | plugin->env->notify_address (plugin->env->cls, | ||
1677 | "tcp", | ||
1678 | addr, addrlen, GNUNET_TIME_UNIT_FOREVER_REL); | ||
1679 | } | ||
1680 | |||
1681 | |||
1682 | /** | ||
1683 | * Entry point for the plugin. | ||
1684 | */ | ||
1685 | void * | ||
1686 | libgnunet_plugin_transport_tcp_init (void *cls) | ||
1687 | { | ||
1688 | struct GNUNET_TRANSPORT_PluginEnvironment *env = cls; | ||
1689 | struct GNUNET_TRANSPORT_PluginFunctions *api; | ||
1690 | struct Plugin *plugin; | ||
1691 | struct GNUNET_SERVICE_Context *service; | ||
1692 | unsigned long long aport; | ||
1693 | unsigned long long bport; | ||
1694 | |||
1695 | service = GNUNET_SERVICE_start ("tcp", env->sched, env->cfg); | ||
1696 | if (service == NULL) | ||
1697 | { | ||
1698 | GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, | ||
1699 | "tcp", | ||
1700 | _ | ||
1701 | ("Failed to start service for `%s' transport plugin.\n"), | ||
1702 | "tcp"); | ||
1703 | return NULL; | ||
1704 | } | ||
1705 | aport = 0; | ||
1706 | if ((GNUNET_OK != | ||
1707 | GNUNET_CONFIGURATION_get_value_number (env->cfg, | ||
1708 | "tcp", | ||
1709 | "PORT", | ||
1710 | &bport)) || | ||
1711 | (bport > 65535) || | ||
1712 | ((GNUNET_OK == | ||
1713 | GNUNET_CONFIGURATION_get_value_number (env->cfg, | ||
1714 | "tcp", | ||
1715 | "ADVERTISED-PORT", | ||
1716 | &aport)) && (aport > 65535))) | ||
1717 | { | ||
1718 | GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, | ||
1719 | "tcp", | ||
1720 | _ | ||
1721 | ("Require valid port number for service `%s' in configuration!\n"), | ||
1722 | "tcp"); | ||
1723 | GNUNET_SERVICE_stop (service); | ||
1724 | return NULL; | ||
1725 | } | ||
1726 | if (aport == 0) | ||
1727 | aport = bport; | ||
1728 | plugin = GNUNET_malloc (sizeof (struct Plugin)); | ||
1729 | plugin->open_port = bport; | ||
1730 | plugin->adv_port = aport; | ||
1731 | plugin->env = env; | ||
1732 | plugin->lsock = NULL; | ||
1733 | plugin->statistics = NULL; | ||
1734 | api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions)); | ||
1735 | api->cls = plugin; | ||
1736 | api->send_to = &tcp_plugin_send_to; | ||
1737 | api->send = &tcp_plugin_send; | ||
1738 | api->cancel = &tcp_plugin_cancel; | ||
1739 | api->address_pretty_printer = &tcp_plugin_address_pretty_printer; | ||
1740 | api->set_receive_quota = &tcp_plugin_set_receive_quota; | ||
1741 | api->address_suggested = &tcp_plugin_address_suggested; | ||
1742 | api->cost_estimate = 42; /* TODO: ATS */ | ||
1743 | plugin->service = service; | ||
1744 | plugin->server = GNUNET_SERVICE_get_server (service); | ||
1745 | create_tcp_handlers (plugin); | ||
1746 | GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, | ||
1747 | "tcp", _("TCP transport listening on port %u\n"), bport); | ||
1748 | if (aport != bport) | ||
1749 | GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, | ||
1750 | "tcp", | ||
1751 | _ | ||
1752 | ("TCP transport advertises itself as being on port %u\n"), | ||
1753 | aport); | ||
1754 | GNUNET_SERVER_disconnect_notify (plugin->server, &disconnect_notify, | ||
1755 | plugin); | ||
1756 | GNUNET_OS_network_interfaces_list (&process_interfaces, plugin); | ||
1757 | GNUNET_RESOLVER_hostname_resolve (env->sched, | ||
1758 | env->cfg, | ||
1759 | AF_UNSPEC, | ||
1760 | HOSTNAME_RESOLVE_TIMEOUT, | ||
1761 | &process_hostname_ips, plugin); | ||
1762 | return api; | ||
1763 | } | ||
1764 | |||
1765 | |||
1766 | /** | ||
1767 | * Exit point from the plugin. | ||
1768 | */ | ||
1769 | void * | ||
1770 | libgnunet_plugin_transport_tcp_done (void *cls) | ||
1771 | { | ||
1772 | struct GNUNET_TRANSPORT_PluginFunctions *api = cls; | ||
1773 | struct Plugin *plugin = api->cls; | ||
1774 | |||
1775 | GNUNET_SERVICE_stop (plugin->service); | ||
1776 | GNUNET_free (plugin->handlers); | ||
1777 | GNUNET_free (plugin); | ||
1778 | GNUNET_free (api); | ||
1779 | return NULL; | ||
1780 | } | ||
1781 | |||
1782 | /* end of plugin_transport_tcp.c */ | ||