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Diffstat (limited to 'src/transport/plugin_transport_xt.c')
-rw-r--r-- | src/transport/plugin_transport_xt.c | 4107 |
1 files changed, 0 insertions, 4107 deletions
diff --git a/src/transport/plugin_transport_xt.c b/src/transport/plugin_transport_xt.c deleted file mode 100644 index df5e8a127..000000000 --- a/src/transport/plugin_transport_xt.c +++ /dev/null | |||
@@ -1,4107 +0,0 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | Copyright (C) 2002--2015 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | /** | ||
21 | * @file transport/plugin_transport_xt.c | ||
22 | * @brief Implementation of the TCP transport service | ||
23 | * @author Christian Grothoff | ||
24 | */ | ||
25 | #include "platform.h" | ||
26 | #include "gnunet_hello_lib.h" | ||
27 | #include "gnunet_constants.h" | ||
28 | #include "gnunet_util_lib.h" | ||
29 | #include "gnunet_nat_service.h" | ||
30 | #include "gnunet_protocols.h" | ||
31 | #include "gnunet_resolver_service.h" | ||
32 | #include "gnunet_signatures.h" | ||
33 | #include "gnunet_statistics_service.h" | ||
34 | #include "gnunet_transport_service.h" | ||
35 | #include "gnunet_transport_plugin.h" | ||
36 | #include "transport.h" | ||
37 | |||
38 | #define LOG(kind,...) GNUNET_log_from (kind, "transport-xt",__VA_ARGS__) | ||
39 | |||
40 | #define PLUGIN_NAME "xt" | ||
41 | |||
42 | /** | ||
43 | * How long until we give up on establishing an NAT connection? | ||
44 | * Must be > 4 RTT | ||
45 | */ | ||
46 | #define NAT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10) | ||
47 | |||
48 | /** | ||
49 | * Opaque handle that can be used to cancel | ||
50 | * a transmit-ready notification. | ||
51 | */ | ||
52 | struct GNUNET_CONNECTION_TransmitHandle; | ||
53 | |||
54 | /** | ||
55 | * @brief handle for a server | ||
56 | */ | ||
57 | struct GNUNET_SERVER_Handle; | ||
58 | |||
59 | /** | ||
60 | * @brief opaque handle for a client of the server | ||
61 | */ | ||
62 | struct GNUNET_SERVER_Client; | ||
63 | |||
64 | /** | ||
65 | * @brief opaque handle server returns for aborting transmission to a client. | ||
66 | */ | ||
67 | struct GNUNET_SERVER_TransmitHandle; | ||
68 | |||
69 | /** | ||
70 | * @brief handle for a network connection | ||
71 | */ | ||
72 | struct GNUNET_CONNECTION_Handle; | ||
73 | |||
74 | /** | ||
75 | * @brief handle for a network service | ||
76 | */ | ||
77 | struct LEGACY_SERVICE_Context; | ||
78 | |||
79 | |||
80 | /** | ||
81 | * Stops a service that was started with #GNUNET_SERVICE_start(). | ||
82 | * | ||
83 | * @param srv service to stop | ||
84 | */ | ||
85 | void | ||
86 | LEGACY_SERVICE_stop (struct LEGACY_SERVICE_Context *srv); | ||
87 | |||
88 | |||
89 | |||
90 | /** | ||
91 | * Function called to notify a client about the connection begin ready | ||
92 | * to queue more data. @a buf will be NULL and @a size zero if the | ||
93 | * connection was closed for writing in the meantime. | ||
94 | * | ||
95 | * @param cls closure | ||
96 | * @param size number of bytes available in @a buf | ||
97 | * @param buf where the callee should write the message | ||
98 | * @return number of bytes written to @a buf | ||
99 | */ | ||
100 | typedef size_t | ||
101 | (*GNUNET_CONNECTION_TransmitReadyNotify) (void *cls, | ||
102 | size_t size, | ||
103 | void *buf); | ||
104 | |||
105 | /** | ||
106 | * Credentials for UNIX domain sockets. | ||
107 | */ | ||
108 | struct GNUNET_CONNECTION_Credentials | ||
109 | { | ||
110 | /** | ||
111 | * UID of the other end of the connection. | ||
112 | */ | ||
113 | uid_t uid; | ||
114 | |||
115 | /** | ||
116 | * GID of the other end of the connection. | ||
117 | */ | ||
118 | gid_t gid; | ||
119 | }; | ||
120 | |||
121 | |||
122 | /** | ||
123 | * Functions with this signature are called whenever a client | ||
124 | * is disconnected on the network level. | ||
125 | * | ||
126 | * @param cls closure | ||
127 | * @param client identification of the client; NULL | ||
128 | * for the last call when the server is destroyed | ||
129 | */ | ||
130 | typedef void | ||
131 | (*GNUNET_SERVER_DisconnectCallback) (void *cls, | ||
132 | struct GNUNET_SERVER_Client *client); | ||
133 | |||
134 | |||
135 | /** | ||
136 | * Functions with this signature are called whenever a client | ||
137 | * is connected on the network level. | ||
138 | * | ||
139 | * @param cls closure | ||
140 | * @param client identification of the client | ||
141 | */ | ||
142 | typedef void | ||
143 | (*GNUNET_SERVER_ConnectCallback) (void *cls, | ||
144 | struct GNUNET_SERVER_Client *client); | ||
145 | |||
146 | |||
147 | |||
148 | |||
149 | /** | ||
150 | * Function to call for access control checks. | ||
151 | * | ||
152 | * @param cls closure | ||
153 | * @param ucred credentials, if available, otherwise NULL | ||
154 | * @param addr address | ||
155 | * @param addrlen length of address | ||
156 | * @return GNUNET_YES to allow, GNUNET_NO to deny, GNUNET_SYSERR | ||
157 | * for unknown address family (will be denied). | ||
158 | */ | ||
159 | typedef int | ||
160 | (*GNUNET_CONNECTION_AccessCheck) (void *cls, | ||
161 | const struct | ||
162 | GNUNET_CONNECTION_Credentials * | ||
163 | ucred, | ||
164 | const struct sockaddr * addr, | ||
165 | socklen_t addrlen); | ||
166 | |||
167 | /** | ||
168 | * Callback function for data received from the network. Note that | ||
169 | * both "available" and "err" would be 0 if the read simply timed out. | ||
170 | * | ||
171 | * @param cls closure | ||
172 | * @param buf pointer to received data | ||
173 | * @param available number of bytes availabe in "buf", | ||
174 | * possibly 0 (on errors) | ||
175 | * @param addr address of the sender | ||
176 | * @param addrlen size of addr | ||
177 | * @param errCode value of errno (on errors receiving) | ||
178 | */ | ||
179 | typedef void | ||
180 | (*GNUNET_CONNECTION_Receiver) (void *cls, const void *buf, | ||
181 | size_t available, | ||
182 | const struct sockaddr * addr, | ||
183 | socklen_t addrlen, int errCode); | ||
184 | |||
185 | |||
186 | |||
187 | /** | ||
188 | * Close the connection and free associated resources. There must | ||
189 | * not be any pending requests for reading or writing to the | ||
190 | * connection at this time. | ||
191 | * | ||
192 | * @param connection connection to destroy | ||
193 | */ | ||
194 | void | ||
195 | GNUNET_CONNECTION_destroy (struct GNUNET_CONNECTION_Handle *connection); | ||
196 | |||
197 | |||
198 | /** | ||
199 | * Signature of a function to create a custom tokenizer. | ||
200 | * | ||
201 | * @param cls closure from #GNUNET_SERVER_set_callbacks | ||
202 | * @param client handle to client the tokenzier will be used for | ||
203 | * @return handle to custom tokenizer ('mst') | ||
204 | */ | ||
205 | typedef void* | ||
206 | (*GNUNET_SERVER_MstCreateCallback) (void *cls, | ||
207 | struct GNUNET_SERVER_Client *client); | ||
208 | |||
209 | |||
210 | /** | ||
211 | * Signature of a function to destroy a custom tokenizer. | ||
212 | * | ||
213 | * @param cls closure from #GNUNET_SERVER_set_callbacks | ||
214 | * @param mst custom tokenizer handle | ||
215 | */ | ||
216 | typedef void | ||
217 | (*GNUNET_SERVER_MstDestroyCallback) (void *cls, | ||
218 | void *mst); | ||
219 | |||
220 | /** | ||
221 | * Signature of a function to receive data for a custom tokenizer. | ||
222 | * | ||
223 | * @param cls closure from #GNUNET_SERVER_set_callbacks | ||
224 | * @param mst custom tokenizer handle | ||
225 | * @param client_identity ID of client for which this is a buffer, | ||
226 | * can be NULL (will be passed back to 'cb') | ||
227 | * @param buf input data to add | ||
228 | * @param size number of bytes in @a buf | ||
229 | * @param purge should any excess bytes in the buffer be discarded | ||
230 | * (i.e. for packet-based services like UDP) | ||
231 | * @param one_shot only call callback once, keep rest of message in buffer | ||
232 | * @return #GNUNET_OK if we are done processing (need more data) | ||
233 | * #GNUNET_NO if one_shot was set and we have another message ready | ||
234 | * #GNUNET_SYSERR if the data stream is corrupt | ||
235 | */ | ||
236 | typedef int | ||
237 | (*GNUNET_SERVER_MstReceiveCallback) (void *cls, void *mst, | ||
238 | struct GNUNET_SERVER_Client *client, | ||
239 | const char *buf, | ||
240 | size_t size, | ||
241 | int purge, | ||
242 | int one_shot); | ||
243 | /** | ||
244 | * Functions with this signature are called whenever a message is | ||
245 | * received. | ||
246 | * | ||
247 | * @param cls closure | ||
248 | * @param client identification of the client | ||
249 | * @param message the actual message | ||
250 | */ | ||
251 | typedef void | ||
252 | (*GNUNET_SERVER_MessageCallback) (void *cls, | ||
253 | struct GNUNET_SERVER_Client *client, | ||
254 | const struct GNUNET_MessageHeader *message); | ||
255 | |||
256 | /** | ||
257 | * Message handler. Each struct specifies how to handle on particular | ||
258 | * type of message received. | ||
259 | */ | ||
260 | struct GNUNET_SERVER_MessageHandler | ||
261 | { | ||
262 | /** | ||
263 | * Function to call for messages of "type". | ||
264 | */ | ||
265 | GNUNET_SERVER_MessageCallback callback; | ||
266 | |||
267 | /** | ||
268 | * Closure argument for @e callback. | ||
269 | */ | ||
270 | void *callback_cls; | ||
271 | |||
272 | /** | ||
273 | * Type of the message this handler covers. | ||
274 | */ | ||
275 | uint16_t type; | ||
276 | |||
277 | /** | ||
278 | * Expected size of messages of this type. Use 0 for | ||
279 | * variable-size. If non-zero, messages of the given | ||
280 | * type will be discarded (and the connection closed) | ||
281 | * if they do not have the right size. | ||
282 | */ | ||
283 | uint16_t expected_size; | ||
284 | |||
285 | }; | ||
286 | |||
287 | |||
288 | /** | ||
289 | * Options for the service (bitmask). | ||
290 | */ | ||
291 | enum LEGACY_SERVICE_Options | ||
292 | { | ||
293 | /** | ||
294 | * Use defaults. Terminates all client connections and the listen | ||
295 | * sockets immediately upon receiving the shutdown signal. | ||
296 | */ | ||
297 | LEGACY_SERVICE_OPTION_NONE = 0, | ||
298 | |||
299 | /** | ||
300 | * Do not trigger server shutdown on signal at all; instead, allow | ||
301 | * for the user to terminate the server explicitly when needed | ||
302 | * by calling #LEGACY_SERVICE_shutdown(). | ||
303 | */ | ||
304 | LEGACY_SERVICE_OPTION_MANUAL_SHUTDOWN = 1, | ||
305 | |||
306 | /** | ||
307 | * Trigger a SOFT server shutdown on signals, allowing active | ||
308 | * non-monitor clients to complete their transactions. | ||
309 | */ | ||
310 | LEGACY_SERVICE_OPTION_SOFT_SHUTDOWN = 2 | ||
311 | }; | ||
312 | |||
313 | |||
314 | |||
315 | /** | ||
316 | * Ask the server to disconnect from the given client. This is the | ||
317 | * same as passing #GNUNET_SYSERR to #GNUNET_SERVER_receive_done, | ||
318 | * except that it allows dropping of a client even when not handling a | ||
319 | * message from that client. | ||
320 | * | ||
321 | * @param client the client to disconnect from | ||
322 | */ | ||
323 | void | ||
324 | GNUNET_SERVER_client_disconnect (struct GNUNET_SERVER_Client *client); | ||
325 | |||
326 | /** | ||
327 | * Return user context associated with the given client. | ||
328 | * Note: you should probably use the macro (call without the underscore). | ||
329 | * | ||
330 | * @param client client to query | ||
331 | * @param size number of bytes in user context struct (for verification only) | ||
332 | * @return pointer to user context | ||
333 | */ | ||
334 | void * | ||
335 | GNUNET_SERVER_client_get_user_context_ (struct GNUNET_SERVER_Client *client, | ||
336 | size_t size); | ||
337 | |||
338 | |||
339 | /** | ||
340 | * Functions with this signature are called whenever a | ||
341 | * complete message is received by the tokenizer. | ||
342 | * | ||
343 | * Do not call #GNUNET_SERVER_mst_destroy from within | ||
344 | * the scope of this callback. | ||
345 | * | ||
346 | * @param cls closure | ||
347 | * @param client identification of the client | ||
348 | * @param message the actual message | ||
349 | * @return #GNUNET_OK on success, #GNUNET_SYSERR to stop further processing | ||
350 | */ | ||
351 | typedef int | ||
352 | (*GNUNET_SERVER_MessageTokenizerCallback) (void *cls, | ||
353 | void *client, | ||
354 | const struct GNUNET_MessageHeader *message); | ||
355 | |||
356 | |||
357 | /** | ||
358 | * Create a message stream tokenizer. | ||
359 | * | ||
360 | * @param cb function to call on completed messages | ||
361 | * @param cb_cls closure for @a cb | ||
362 | * @return handle to tokenizer | ||
363 | */ | ||
364 | struct GNUNET_SERVER_MessageStreamTokenizer * | ||
365 | GNUNET_SERVER_mst_create (GNUNET_SERVER_MessageTokenizerCallback cb, | ||
366 | void *cb_cls); | ||
367 | |||
368 | /** | ||
369 | * Add incoming data to the receive buffer and call the | ||
370 | * callback for all complete messages. | ||
371 | * | ||
372 | * @param mst tokenizer to use | ||
373 | * @param client_identity ID of client for which this is a buffer, | ||
374 | * can be NULL (will be passed back to 'cb') | ||
375 | * @param buf input data to add | ||
376 | * @param size number of bytes in @a buf | ||
377 | * @param purge should any excess bytes in the buffer be discarded | ||
378 | * (i.e. for packet-based services like UDP) | ||
379 | * @param one_shot only call callback once, keep rest of message in buffer | ||
380 | * @return #GNUNET_OK if we are done processing (need more data) | ||
381 | * #GNUNET_NO if one_shot was set and we have another message ready | ||
382 | * #GNUNET_SYSERR if the data stream is corrupt | ||
383 | */ | ||
384 | int | ||
385 | GNUNET_SERVER_mst_receive (struct GNUNET_SERVER_MessageStreamTokenizer *mst, | ||
386 | void *client_identity, | ||
387 | const char *buf, size_t size, | ||
388 | int purge, int one_shot); | ||
389 | |||
390 | |||
391 | |||
392 | /** | ||
393 | * Destroys a tokenizer. | ||
394 | * | ||
395 | * @param mst tokenizer to destroy | ||
396 | */ | ||
397 | void | ||
398 | GNUNET_SERVER_mst_destroy (struct GNUNET_SERVER_MessageStreamTokenizer *mst); | ||
399 | |||
400 | |||
401 | /** | ||
402 | * Set user context to be associated with the given client. | ||
403 | * Note: you should probably use the macro (call without the underscore). | ||
404 | * | ||
405 | * @param client client to query | ||
406 | * @param ptr pointer to user context | ||
407 | * @param size number of bytes in user context struct (for verification only) | ||
408 | */ | ||
409 | void | ||
410 | GNUNET_SERVER_client_set_user_context_ (struct GNUNET_SERVER_Client *client, | ||
411 | void *ptr, | ||
412 | size_t size); | ||
413 | /** | ||
414 | * Return user context associated with the given client. | ||
415 | * | ||
416 | * @param client client to query | ||
417 | * @param type expected return type (i.e. 'struct Foo') | ||
418 | * @return pointer to user context of type 'type *'. | ||
419 | */ | ||
420 | #define GNUNET_SERVER_client_get_user_context(client,type) \ | ||
421 | (type *) GNUNET_SERVER_client_get_user_context_ (client, sizeof (type)) | ||
422 | |||
423 | /** | ||
424 | * Set user context to be associated with the given client. | ||
425 | * | ||
426 | * @param client client to query | ||
427 | * @param value pointer to user context | ||
428 | */ | ||
429 | #define GNUNET_SERVER_client_set_user_context(client,value) \ | ||
430 | GNUNET_SERVER_client_set_user_context_ (client, value, sizeof (*value)) | ||
431 | |||
432 | |||
433 | |||
434 | /** | ||
435 | * Notify us when the server has enough space to transmit | ||
436 | * a message of the given size to the given client. | ||
437 | * | ||
438 | * @param client client to transmit message to | ||
439 | * @param size requested amount of buffer space | ||
440 | * @param timeout after how long should we give up (and call | ||
441 | * notify with buf NULL and size 0)? | ||
442 | * @param callback function to call when space is available | ||
443 | * @param callback_cls closure for @a callback | ||
444 | * @return non-NULL if the notify callback was queued; can be used | ||
445 | * to cancel the request using | ||
446 | * #GNUNET_SERVER_notify_transmit_ready_cancel. | ||
447 | * NULL if we are already going to notify someone else (busy) | ||
448 | */ | ||
449 | struct GNUNET_SERVER_TransmitHandle * | ||
450 | GNUNET_SERVER_notify_transmit_ready (struct GNUNET_SERVER_Client *client, | ||
451 | size_t size, | ||
452 | struct GNUNET_TIME_Relative timeout, | ||
453 | GNUNET_CONNECTION_TransmitReadyNotify callback, | ||
454 | void *callback_cls); | ||
455 | |||
456 | /** | ||
457 | * Abort transmission request. | ||
458 | * | ||
459 | * @param th request to abort | ||
460 | */ | ||
461 | void | ||
462 | GNUNET_SERVER_notify_transmit_ready_cancel (struct GNUNET_SERVER_TransmitHandle *th); | ||
463 | |||
464 | |||
465 | |||
466 | |||
467 | /** | ||
468 | * Notify the server that the given client handle should | ||
469 | * be kept (keeps the connection up if possible, increments | ||
470 | * the internal reference counter). | ||
471 | * | ||
472 | * @param client the client to keep | ||
473 | */ | ||
474 | void | ||
475 | GNUNET_SERVER_client_keep (struct GNUNET_SERVER_Client *client); | ||
476 | |||
477 | |||
478 | /** | ||
479 | * Notify the server that the given client handle is no | ||
480 | * longer required. Decrements the reference counter. If | ||
481 | * that counter reaches zero an inactive connection maybe | ||
482 | * closed. | ||
483 | * | ||
484 | * @param client the client to drop | ||
485 | */ | ||
486 | void | ||
487 | GNUNET_SERVER_client_drop (struct GNUNET_SERVER_Client *client); | ||
488 | |||
489 | |||
490 | /** | ||
491 | * Function called by the service's run | ||
492 | * method to run service-specific setup code. | ||
493 | * | ||
494 | * @param cls closure | ||
495 | * @param server the initialized server | ||
496 | * @param cfg configuration to use | ||
497 | */ | ||
498 | typedef void | ||
499 | (*LEGACY_SERVICE_Main) (void *cls, | ||
500 | struct GNUNET_SERVER_Handle *server, | ||
501 | const struct GNUNET_CONFIGURATION_Handle *cfg); | ||
502 | |||
503 | |||
504 | |||
505 | /** | ||
506 | * Suspend accepting connections from the listen socket temporarily. | ||
507 | * Resume activity using #GNUNET_SERVER_resume. | ||
508 | * | ||
509 | * @param server server to stop accepting connections. | ||
510 | */ | ||
511 | void | ||
512 | GNUNET_SERVER_suspend (struct GNUNET_SERVER_Handle *server); | ||
513 | |||
514 | /** | ||
515 | * Notify us when the server has enough space to transmit | ||
516 | * a message of the given size to the given client. | ||
517 | * | ||
518 | * @param client client to transmit message to | ||
519 | * @param size requested amount of buffer space | ||
520 | * @param timeout after how long should we give up (and call | ||
521 | * notify with buf NULL and size 0)? | ||
522 | * @param callback function to call when space is available | ||
523 | * @param callback_cls closure for @a callback | ||
524 | * @return non-NULL if the notify callback was queued; can be used | ||
525 | * to cancel the request using | ||
526 | * #GNUNET_SERVER_notify_transmit_ready_cancel. | ||
527 | * NULL if we are already going to notify someone else (busy) | ||
528 | */ | ||
529 | struct GNUNET_SERVER_TransmitHandle * | ||
530 | GNUNET_SERVER_notify_transmit_ready (struct GNUNET_SERVER_Client *client, | ||
531 | size_t size, | ||
532 | struct GNUNET_TIME_Relative timeout, | ||
533 | GNUNET_CONNECTION_TransmitReadyNotify callback, | ||
534 | void *callback_cls); | ||
535 | |||
536 | |||
537 | /** | ||
538 | * Add a TCP socket-based connection to the set of handles managed by | ||
539 | * this server. Use this function for outgoing (P2P) connections that | ||
540 | * we initiated (and where this server should process incoming | ||
541 | * messages). | ||
542 | * | ||
543 | * @param server the server to use | ||
544 | * @param connection the connection to manage (client must | ||
545 | * stop using this connection from now on) | ||
546 | * @return the client handle | ||
547 | */ | ||
548 | struct GNUNET_SERVER_Client * | ||
549 | GNUNET_SERVER_connect_socket (struct GNUNET_SERVER_Handle *server, | ||
550 | struct GNUNET_CONNECTION_Handle *connection); | ||
551 | |||
552 | |||
553 | /** | ||
554 | * Resume accepting connections from the listen socket. | ||
555 | * | ||
556 | * @param server server to resume accepting connections. | ||
557 | */ | ||
558 | void | ||
559 | GNUNET_SERVER_resume (struct GNUNET_SERVER_Handle *server); | ||
560 | |||
561 | /** | ||
562 | * Free resources held by this server. | ||
563 | * | ||
564 | * @param server server to destroy | ||
565 | */ | ||
566 | void | ||
567 | GNUNET_SERVER_destroy (struct GNUNET_SERVER_Handle *server); | ||
568 | |||
569 | |||
570 | |||
571 | |||
572 | #include "tcp_connection_legacy.c" | ||
573 | #include "tcp_server_mst_legacy.c" | ||
574 | #include "tcp_server_legacy.c" | ||
575 | #include "tcp_service_legacy.c" | ||
576 | |||
577 | GNUNET_NETWORK_STRUCT_BEGIN | ||
578 | |||
579 | /** | ||
580 | * Initial handshake message for a session. | ||
581 | */ | ||
582 | struct WelcomeMessage | ||
583 | { | ||
584 | /** | ||
585 | * Type is #GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME. | ||
586 | */ | ||
587 | struct GNUNET_MessageHeader header; | ||
588 | |||
589 | /** | ||
590 | * Identity of the node connecting (TCP client) | ||
591 | */ | ||
592 | struct GNUNET_PeerIdentity clientIdentity; | ||
593 | |||
594 | }; | ||
595 | |||
596 | /** | ||
597 | * Basically a WELCOME message, but with the purpose | ||
598 | * of giving the waiting peer a client handle to use | ||
599 | */ | ||
600 | struct TCP_NAT_ProbeMessage | ||
601 | { | ||
602 | /** | ||
603 | * Type is #GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE. | ||
604 | */ | ||
605 | struct GNUNET_MessageHeader header; | ||
606 | |||
607 | /** | ||
608 | * Identity of the sender of the message. | ||
609 | */ | ||
610 | struct GNUNET_PeerIdentity clientIdentity; | ||
611 | |||
612 | }; | ||
613 | GNUNET_NETWORK_STRUCT_END | ||
614 | |||
615 | /** | ||
616 | * Context for sending a NAT probe via TCP. | ||
617 | */ | ||
618 | struct TCPProbeContext | ||
619 | { | ||
620 | |||
621 | /** | ||
622 | * Active probes are kept in a DLL. | ||
623 | */ | ||
624 | struct TCPProbeContext *next; | ||
625 | |||
626 | /** | ||
627 | * Active probes are kept in a DLL. | ||
628 | */ | ||
629 | struct TCPProbeContext *prev; | ||
630 | |||
631 | /** | ||
632 | * Probe connection. | ||
633 | */ | ||
634 | struct GNUNET_CONNECTION_Handle *sock; | ||
635 | |||
636 | /** | ||
637 | * Message to be sent. | ||
638 | */ | ||
639 | struct TCP_NAT_ProbeMessage message; | ||
640 | |||
641 | /** | ||
642 | * Handle to the transmission. | ||
643 | */ | ||
644 | struct GNUNET_CONNECTION_TransmitHandle *transmit_handle; | ||
645 | |||
646 | /** | ||
647 | * Transport plugin handle. | ||
648 | */ | ||
649 | struct Plugin *plugin; | ||
650 | }; | ||
651 | |||
652 | /** | ||
653 | * Bits in the `options` field of TCP addresses. | ||
654 | */ | ||
655 | enum TcpAddressOptions | ||
656 | { | ||
657 | |||
658 | /** | ||
659 | * No bits set. | ||
660 | */ | ||
661 | TCP_OPTIONS_NONE = 0, | ||
662 | |||
663 | /** | ||
664 | * See #HTTP_OPTIONS_VERIFY_CERTIFICATE. | ||
665 | */ | ||
666 | TCP_OPTIONS_RESERVED = 1, | ||
667 | |||
668 | /** | ||
669 | * Enable TCP Stealth-style port knocking. | ||
670 | */ | ||
671 | TCP_OPTIONS_TCP_STEALTH = 2 | ||
672 | }; | ||
673 | |||
674 | GNUNET_NETWORK_STRUCT_BEGIN | ||
675 | |||
676 | /** | ||
677 | * Network format for IPv4 addresses. | ||
678 | */ | ||
679 | struct IPv4TcpAddress | ||
680 | { | ||
681 | /** | ||
682 | * Optional options and flags for this address, | ||
683 | * see `enum TcpAddressOptions` | ||
684 | */ | ||
685 | uint32_t options GNUNET_PACKED; | ||
686 | |||
687 | /** | ||
688 | * IPv4 address, in network byte order. | ||
689 | */ | ||
690 | uint32_t ipv4_addr GNUNET_PACKED; | ||
691 | |||
692 | /** | ||
693 | * Port number, in network byte order. | ||
694 | */ | ||
695 | uint16_t t4_port GNUNET_PACKED; | ||
696 | |||
697 | }; | ||
698 | |||
699 | /** | ||
700 | * Network format for IPv6 addresses. | ||
701 | */ | ||
702 | struct IPv6TcpAddress | ||
703 | { | ||
704 | /** | ||
705 | * Optional flags for this address | ||
706 | * see `enum TcpAddressOptions` | ||
707 | */ | ||
708 | uint32_t options GNUNET_PACKED; | ||
709 | |||
710 | /** | ||
711 | * IPv6 address. | ||
712 | */ | ||
713 | struct in6_addr ipv6_addr GNUNET_PACKED; | ||
714 | |||
715 | /** | ||
716 | * Port number, in network byte order. | ||
717 | */ | ||
718 | uint16_t t6_port GNUNET_PACKED; | ||
719 | |||
720 | }; | ||
721 | GNUNET_NETWORK_STRUCT_END | ||
722 | |||
723 | /** | ||
724 | * Encapsulation of all of the state of the plugin. | ||
725 | */ | ||
726 | struct Plugin; | ||
727 | |||
728 | /** | ||
729 | * Information kept for each message that is yet to | ||
730 | * be transmitted. | ||
731 | */ | ||
732 | struct PendingMessage | ||
733 | { | ||
734 | |||
735 | /** | ||
736 | * This is a doubly-linked list. | ||
737 | */ | ||
738 | struct PendingMessage *next; | ||
739 | |||
740 | /** | ||
741 | * This is a doubly-linked list. | ||
742 | */ | ||
743 | struct PendingMessage *prev; | ||
744 | |||
745 | /** | ||
746 | * The pending message | ||
747 | */ | ||
748 | const char *msg; | ||
749 | |||
750 | /** | ||
751 | * Continuation function to call once the message | ||
752 | * has been sent. Can be NULL if there is no | ||
753 | * continuation to call. | ||
754 | */ | ||
755 | GNUNET_TRANSPORT_TransmitContinuation transmit_cont; | ||
756 | |||
757 | /** | ||
758 | * Closure for @e transmit_cont. | ||
759 | */ | ||
760 | void *transmit_cont_cls; | ||
761 | |||
762 | /** | ||
763 | * Timeout value for the pending message. | ||
764 | */ | ||
765 | struct GNUNET_TIME_Absolute timeout; | ||
766 | |||
767 | /** | ||
768 | * So that the gnunet-service-transport can group messages together, | ||
769 | * these pending messages need to accept a message buffer and size | ||
770 | * instead of just a `struct GNUNET_MessageHeader`. | ||
771 | */ | ||
772 | size_t message_size; | ||
773 | |||
774 | }; | ||
775 | |||
776 | /** | ||
777 | * Session handle for TCP connections. | ||
778 | */ | ||
779 | struct GNUNET_ATS_Session | ||
780 | { | ||
781 | /** | ||
782 | * To whom are we talking to (set to our identity | ||
783 | * if we are still waiting for the welcome message) | ||
784 | */ | ||
785 | struct GNUNET_PeerIdentity target; | ||
786 | |||
787 | /** | ||
788 | * Pointer to the global plugin struct. | ||
789 | */ | ||
790 | struct Plugin *plugin; | ||
791 | |||
792 | /** | ||
793 | * The client (used to identify this connection) | ||
794 | */ | ||
795 | struct GNUNET_SERVER_Client *client; | ||
796 | |||
797 | /** | ||
798 | * Task cleaning up a NAT client connection establishment attempt; | ||
799 | */ | ||
800 | struct GNUNET_SCHEDULER_Task *nat_connection_timeout; | ||
801 | |||
802 | /** | ||
803 | * Messages currently pending for transmission | ||
804 | * to this peer, if any. | ||
805 | */ | ||
806 | struct PendingMessage *pending_messages_head; | ||
807 | |||
808 | /** | ||
809 | * Messages currently pending for transmission | ||
810 | * to this peer, if any. | ||
811 | */ | ||
812 | struct PendingMessage *pending_messages_tail; | ||
813 | |||
814 | /** | ||
815 | * Handle for pending transmission request. | ||
816 | */ | ||
817 | struct GNUNET_SERVER_TransmitHandle *transmit_handle; | ||
818 | |||
819 | /** | ||
820 | * Address of the other peer. | ||
821 | */ | ||
822 | struct GNUNET_HELLO_Address *address; | ||
823 | |||
824 | /** | ||
825 | * ID of task used to delay receiving more to throttle sender. | ||
826 | */ | ||
827 | struct GNUNET_SCHEDULER_Task *receive_delay_task; | ||
828 | |||
829 | /** | ||
830 | * Session timeout task | ||
831 | */ | ||
832 | struct GNUNET_SCHEDULER_Task *timeout_task; | ||
833 | |||
834 | /** | ||
835 | * When will this session time out? | ||
836 | */ | ||
837 | struct GNUNET_TIME_Absolute timeout; | ||
838 | |||
839 | /** | ||
840 | * When will we continue to read from the socket? | ||
841 | * (used to enforce inbound quota). | ||
842 | */ | ||
843 | struct GNUNET_TIME_Absolute receive_delay; | ||
844 | |||
845 | /** | ||
846 | * Last activity on this connection. Used to select preferred | ||
847 | * connection. | ||
848 | */ | ||
849 | struct GNUNET_TIME_Absolute last_activity; | ||
850 | |||
851 | /** | ||
852 | * Number of bytes waiting for transmission to this peer. | ||
853 | */ | ||
854 | unsigned long long bytes_in_queue; | ||
855 | |||
856 | /** | ||
857 | * Number of messages waiting for transmission to this peer. | ||
858 | */ | ||
859 | unsigned int msgs_in_queue; | ||
860 | |||
861 | /** | ||
862 | * Network type of the address. | ||
863 | */ | ||
864 | enum GNUNET_NetworkType scope; | ||
865 | |||
866 | /** | ||
867 | * Are we still expecting the welcome message? (#GNUNET_YES/#GNUNET_NO) | ||
868 | */ | ||
869 | int expecting_welcome; | ||
870 | |||
871 | /** | ||
872 | * Was this session created using NAT traversal? | ||
873 | */ | ||
874 | int is_nat; | ||
875 | |||
876 | }; | ||
877 | |||
878 | |||
879 | /** | ||
880 | * Context for address to string conversion, closure | ||
881 | * for #append_port(). | ||
882 | */ | ||
883 | struct PrettyPrinterContext | ||
884 | { | ||
885 | /** | ||
886 | * DLL | ||
887 | */ | ||
888 | struct PrettyPrinterContext *next; | ||
889 | |||
890 | /** | ||
891 | * DLL | ||
892 | */ | ||
893 | struct PrettyPrinterContext *prev; | ||
894 | |||
895 | /** | ||
896 | * Our plugin. | ||
897 | */ | ||
898 | struct Plugin *plugin; | ||
899 | |||
900 | /** | ||
901 | * Timeout task | ||
902 | */ | ||
903 | struct GNUNET_SCHEDULER_Task *timeout_task; | ||
904 | |||
905 | /** | ||
906 | * Resolver handle | ||
907 | */ | ||
908 | struct GNUNET_RESOLVER_RequestHandle *resolver_handle; | ||
909 | |||
910 | /** | ||
911 | * Function to call with the result. | ||
912 | */ | ||
913 | GNUNET_TRANSPORT_AddressStringCallback asc; | ||
914 | |||
915 | /** | ||
916 | * Clsoure for @e asc. | ||
917 | */ | ||
918 | void *asc_cls; | ||
919 | |||
920 | /** | ||
921 | * IPv6 address | ||
922 | */ | ||
923 | int ipv6; | ||
924 | |||
925 | /** | ||
926 | * Options | ||
927 | */ | ||
928 | uint32_t options; | ||
929 | |||
930 | /** | ||
931 | * Port to add after the IP address. | ||
932 | */ | ||
933 | uint16_t port; | ||
934 | }; | ||
935 | |||
936 | |||
937 | /** | ||
938 | * Encapsulation of all of the state of the plugin. | ||
939 | */ | ||
940 | struct Plugin | ||
941 | { | ||
942 | /** | ||
943 | * Our environment. | ||
944 | */ | ||
945 | struct GNUNET_TRANSPORT_PluginEnvironment *env; | ||
946 | |||
947 | /** | ||
948 | * The listen socket. | ||
949 | */ | ||
950 | struct GNUNET_CONNECTION_Handle *lsock; | ||
951 | |||
952 | /** | ||
953 | * Our handle to the NAT module. | ||
954 | */ | ||
955 | struct GNUNET_NAT_Handle *nat; | ||
956 | |||
957 | /** | ||
958 | * Map from peer identities to sessions for the given peer. | ||
959 | */ | ||
960 | struct GNUNET_CONTAINER_MultiPeerMap *sessionmap; | ||
961 | |||
962 | /** | ||
963 | * Handle to the network service. | ||
964 | */ | ||
965 | struct LEGACY_SERVICE_Context *service; | ||
966 | |||
967 | /** | ||
968 | * Handle to the server for this service. | ||
969 | */ | ||
970 | struct GNUNET_SERVER_Handle *server; | ||
971 | |||
972 | /** | ||
973 | * Copy of the handler array where the closures are | ||
974 | * set to this struct's instance. | ||
975 | */ | ||
976 | struct GNUNET_SERVER_MessageHandler *handlers; | ||
977 | |||
978 | /** | ||
979 | * Map of peers we have tried to contact behind a NAT | ||
980 | */ | ||
981 | struct GNUNET_CONTAINER_MultiPeerMap *nat_wait_conns; | ||
982 | |||
983 | /** | ||
984 | * List of active TCP probes. | ||
985 | */ | ||
986 | struct TCPProbeContext *probe_head; | ||
987 | |||
988 | /** | ||
989 | * List of active TCP probes. | ||
990 | */ | ||
991 | struct TCPProbeContext *probe_tail; | ||
992 | |||
993 | /** | ||
994 | * Function to call about session status changes. | ||
995 | */ | ||
996 | GNUNET_TRANSPORT_SessionInfoCallback sic; | ||
997 | |||
998 | /** | ||
999 | * Closure for @e sic. | ||
1000 | */ | ||
1001 | void *sic_cls; | ||
1002 | |||
1003 | /** | ||
1004 | * ID of task used to update our addresses when one expires. | ||
1005 | */ | ||
1006 | struct GNUNET_SCHEDULER_Task *address_update_task; | ||
1007 | |||
1008 | /** | ||
1009 | * Running pretty printers: head | ||
1010 | */ | ||
1011 | struct PrettyPrinterContext *ppc_dll_head; | ||
1012 | |||
1013 | /** | ||
1014 | * Running pretty printers: tail | ||
1015 | */ | ||
1016 | struct PrettyPrinterContext *ppc_dll_tail; | ||
1017 | |||
1018 | /** | ||
1019 | * Welcome message used by this peer. | ||
1020 | */ | ||
1021 | struct WelcomeMessage my_welcome; | ||
1022 | |||
1023 | /** | ||
1024 | * How many more TCP sessions are we allowed to open right now? | ||
1025 | */ | ||
1026 | unsigned long long max_connections; | ||
1027 | |||
1028 | /** | ||
1029 | * How many more TCP sessions do we have right now? | ||
1030 | */ | ||
1031 | unsigned long long cur_connections; | ||
1032 | |||
1033 | /** | ||
1034 | * Address options | ||
1035 | */ | ||
1036 | uint32_t myoptions; | ||
1037 | |||
1038 | /** | ||
1039 | * Port that we are actually listening on. | ||
1040 | */ | ||
1041 | uint16_t open_port; | ||
1042 | |||
1043 | /** | ||
1044 | * Port that the user said we would have visible to the | ||
1045 | * rest of the world. | ||
1046 | */ | ||
1047 | uint16_t adv_port; | ||
1048 | |||
1049 | }; | ||
1050 | |||
1051 | |||
1052 | /** | ||
1053 | * Get the list of addresses that a server for the given service | ||
1054 | * should bind to. | ||
1055 | * | ||
1056 | * @param service_name name of the service | ||
1057 | * @param cfg configuration (which specifies the addresses) | ||
1058 | * @param addrs set (call by reference) to an array of pointers to the | ||
1059 | * addresses the server should bind to and listen on; the | ||
1060 | * array will be NULL-terminated (on success) | ||
1061 | * @param addr_lens set (call by reference) to an array of the lengths | ||
1062 | * of the respective `struct sockaddr` struct in the @a addrs | ||
1063 | * array (on success) | ||
1064 | * @return number of addresses found on success, | ||
1065 | * #GNUNET_SYSERR if the configuration | ||
1066 | * did not specify reasonable finding information or | ||
1067 | * if it specified a hostname that could not be resolved; | ||
1068 | * #GNUNET_NO if the number of addresses configured is | ||
1069 | * zero (in this case, `*addrs` and `*addr_lens` will be | ||
1070 | * set to NULL). | ||
1071 | */ | ||
1072 | static int | ||
1073 | get_server_addresses (const char *service_name, | ||
1074 | const struct GNUNET_CONFIGURATION_Handle *cfg, | ||
1075 | struct sockaddr ***addrs, | ||
1076 | socklen_t ** addr_lens) | ||
1077 | { | ||
1078 | int disablev6; | ||
1079 | struct GNUNET_NETWORK_Handle *desc; | ||
1080 | unsigned long long port; | ||
1081 | char *unixpath; | ||
1082 | struct addrinfo hints; | ||
1083 | struct addrinfo *res; | ||
1084 | struct addrinfo *pos; | ||
1085 | struct addrinfo *next; | ||
1086 | unsigned int i; | ||
1087 | int resi; | ||
1088 | int ret; | ||
1089 | int abstract; | ||
1090 | struct sockaddr **saddrs; | ||
1091 | socklen_t *saddrlens; | ||
1092 | char *hostname; | ||
1093 | |||
1094 | *addrs = NULL; | ||
1095 | *addr_lens = NULL; | ||
1096 | desc = NULL; | ||
1097 | if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "DISABLEV6")) | ||
1098 | { | ||
1099 | if (GNUNET_SYSERR == | ||
1100 | (disablev6 = | ||
1101 | GNUNET_CONFIGURATION_get_value_yesno (cfg, service_name, "DISABLEV6"))) | ||
1102 | return GNUNET_SYSERR; | ||
1103 | } | ||
1104 | else | ||
1105 | disablev6 = GNUNET_NO; | ||
1106 | |||
1107 | if (! disablev6) | ||
1108 | { | ||
1109 | /* probe IPv6 support */ | ||
1110 | desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_STREAM, 0); | ||
1111 | if (NULL == desc) | ||
1112 | { | ||
1113 | if ((ENOBUFS == errno) || (ENOMEM == errno) || (ENFILE == errno) || | ||
1114 | (EACCES == errno)) | ||
1115 | { | ||
1116 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket"); | ||
1117 | return GNUNET_SYSERR; | ||
1118 | } | ||
1119 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
1120 | _("Disabling IPv6 support for service `%s', failed to create IPv6 socket: %s\n"), | ||
1121 | service_name, STRERROR (errno)); | ||
1122 | disablev6 = GNUNET_YES; | ||
1123 | } | ||
1124 | else | ||
1125 | { | ||
1126 | GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (desc)); | ||
1127 | desc = NULL; | ||
1128 | } | ||
1129 | } | ||
1130 | |||
1131 | port = 0; | ||
1132 | if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "PORT")) | ||
1133 | { | ||
1134 | if (GNUNET_OK != | ||
1135 | GNUNET_CONFIGURATION_get_value_number (cfg, service_name, | ||
1136 | "PORT", &port)) | ||
1137 | { | ||
1138 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
1139 | _("Require valid port number for service `%s' in configuration!\n"), | ||
1140 | service_name); | ||
1141 | } | ||
1142 | if (port > 65535) | ||
1143 | { | ||
1144 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
1145 | _("Require valid port number for service `%s' in configuration!\n"), | ||
1146 | service_name); | ||
1147 | return GNUNET_SYSERR; | ||
1148 | } | ||
1149 | } | ||
1150 | |||
1151 | if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "BINDTO")) | ||
1152 | { | ||
1153 | GNUNET_break (GNUNET_OK == | ||
1154 | GNUNET_CONFIGURATION_get_value_string (cfg, service_name, | ||
1155 | "BINDTO", &hostname)); | ||
1156 | } | ||
1157 | else | ||
1158 | hostname = NULL; | ||
1159 | |||
1160 | unixpath = NULL; | ||
1161 | abstract = GNUNET_NO; | ||
1162 | #ifdef AF_UNIX | ||
1163 | if ((GNUNET_YES == | ||
1164 | GNUNET_CONFIGURATION_have_value (cfg, service_name, "UNIXPATH")) && | ||
1165 | (GNUNET_OK == | ||
1166 | GNUNET_CONFIGURATION_get_value_filename (cfg, service_name, "UNIXPATH", | ||
1167 | &unixpath)) && | ||
1168 | (0 < strlen (unixpath))) | ||
1169 | { | ||
1170 | /* probe UNIX support */ | ||
1171 | struct sockaddr_un s_un; | ||
1172 | |||
1173 | if (strlen (unixpath) >= sizeof (s_un.sun_path)) | ||
1174 | { | ||
1175 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
1176 | _("UNIXPATH `%s' too long, maximum length is %llu\n"), unixpath, | ||
1177 | (unsigned long long) sizeof (s_un.sun_path)); | ||
1178 | unixpath = GNUNET_NETWORK_shorten_unixpath (unixpath); | ||
1179 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
1180 | _("Using `%s' instead\n"), | ||
1181 | unixpath); | ||
1182 | } | ||
1183 | #ifdef LINUX | ||
1184 | abstract = GNUNET_CONFIGURATION_get_value_yesno (cfg, | ||
1185 | "TESTING", | ||
1186 | "USE_ABSTRACT_SOCKETS"); | ||
1187 | if (GNUNET_SYSERR == abstract) | ||
1188 | abstract = GNUNET_NO; | ||
1189 | #endif | ||
1190 | if ((GNUNET_YES != abstract) | ||
1191 | && (GNUNET_OK != | ||
1192 | GNUNET_DISK_directory_create_for_file (unixpath))) | ||
1193 | GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, | ||
1194 | "mkdir", | ||
1195 | unixpath); | ||
1196 | } | ||
1197 | if (NULL != unixpath) | ||
1198 | { | ||
1199 | desc = GNUNET_NETWORK_socket_create (AF_UNIX, SOCK_STREAM, 0); | ||
1200 | if (NULL == desc) | ||
1201 | { | ||
1202 | if ((ENOBUFS == errno) || (ENOMEM == errno) || (ENFILE == errno) || | ||
1203 | (EACCES == errno)) | ||
1204 | { | ||
1205 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket"); | ||
1206 | GNUNET_free_non_null (hostname); | ||
1207 | GNUNET_free (unixpath); | ||
1208 | return GNUNET_SYSERR; | ||
1209 | } | ||
1210 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
1211 | _("Disabling UNIX domain socket support for service `%s', failed to create UNIX domain socket: %s\n"), | ||
1212 | service_name, | ||
1213 | STRERROR (errno)); | ||
1214 | GNUNET_free (unixpath); | ||
1215 | unixpath = NULL; | ||
1216 | } | ||
1217 | else | ||
1218 | { | ||
1219 | GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (desc)); | ||
1220 | desc = NULL; | ||
1221 | } | ||
1222 | } | ||
1223 | #endif | ||
1224 | |||
1225 | if ((0 == port) && (NULL == unixpath)) | ||
1226 | { | ||
1227 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
1228 | _("Have neither PORT nor UNIXPATH for service `%s', but one is required\n"), | ||
1229 | service_name); | ||
1230 | GNUNET_free_non_null (hostname); | ||
1231 | return GNUNET_SYSERR; | ||
1232 | } | ||
1233 | if (0 == port) | ||
1234 | { | ||
1235 | saddrs = GNUNET_malloc (2 * sizeof (struct sockaddr *)); | ||
1236 | saddrlens = GNUNET_malloc (2 * sizeof (socklen_t)); | ||
1237 | add_unixpath (saddrs, saddrlens, unixpath, abstract); | ||
1238 | GNUNET_free_non_null (unixpath); | ||
1239 | GNUNET_free_non_null (hostname); | ||
1240 | *addrs = saddrs; | ||
1241 | *addr_lens = saddrlens; | ||
1242 | return 1; | ||
1243 | } | ||
1244 | |||
1245 | if (NULL != hostname) | ||
1246 | { | ||
1247 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
1248 | "Resolving `%s' since that is where `%s' will bind to.\n", | ||
1249 | hostname, | ||
1250 | service_name); | ||
1251 | memset (&hints, 0, sizeof (struct addrinfo)); | ||
1252 | if (disablev6) | ||
1253 | hints.ai_family = AF_INET; | ||
1254 | hints.ai_protocol = IPPROTO_TCP; | ||
1255 | if ((0 != (ret = getaddrinfo (hostname, NULL, &hints, &res))) || | ||
1256 | (NULL == res)) | ||
1257 | { | ||
1258 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
1259 | _("Failed to resolve `%s': %s\n"), | ||
1260 | hostname, | ||
1261 | gai_strerror (ret)); | ||
1262 | GNUNET_free (hostname); | ||
1263 | GNUNET_free_non_null (unixpath); | ||
1264 | return GNUNET_SYSERR; | ||
1265 | } | ||
1266 | next = res; | ||
1267 | i = 0; | ||
1268 | while (NULL != (pos = next)) | ||
1269 | { | ||
1270 | next = pos->ai_next; | ||
1271 | if ((disablev6) && (pos->ai_family == AF_INET6)) | ||
1272 | continue; | ||
1273 | i++; | ||
1274 | } | ||
1275 | if (0 == i) | ||
1276 | { | ||
1277 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
1278 | _("Failed to find %saddress for `%s'.\n"), | ||
1279 | disablev6 ? "IPv4 " : "", | ||
1280 | hostname); | ||
1281 | freeaddrinfo (res); | ||
1282 | GNUNET_free (hostname); | ||
1283 | GNUNET_free_non_null (unixpath); | ||
1284 | return GNUNET_SYSERR; | ||
1285 | } | ||
1286 | resi = i; | ||
1287 | if (NULL != unixpath) | ||
1288 | resi++; | ||
1289 | saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *)); | ||
1290 | saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t)); | ||
1291 | i = 0; | ||
1292 | if (NULL != unixpath) | ||
1293 | { | ||
1294 | add_unixpath (saddrs, saddrlens, unixpath, abstract); | ||
1295 | i++; | ||
1296 | } | ||
1297 | next = res; | ||
1298 | while (NULL != (pos = next)) | ||
1299 | { | ||
1300 | next = pos->ai_next; | ||
1301 | if ((disablev6) && (AF_INET6 == pos->ai_family)) | ||
1302 | continue; | ||
1303 | if ((IPPROTO_TCP != pos->ai_protocol) && (0 != pos->ai_protocol)) | ||
1304 | continue; /* not TCP */ | ||
1305 | if ((SOCK_STREAM != pos->ai_socktype) && (0 != pos->ai_socktype)) | ||
1306 | continue; /* huh? */ | ||
1307 | LOG (GNUNET_ERROR_TYPE_DEBUG, "Service `%s' will bind to `%s'\n", | ||
1308 | service_name, GNUNET_a2s (pos->ai_addr, pos->ai_addrlen)); | ||
1309 | if (AF_INET == pos->ai_family) | ||
1310 | { | ||
1311 | GNUNET_assert (sizeof (struct sockaddr_in) == pos->ai_addrlen); | ||
1312 | saddrlens[i] = pos->ai_addrlen; | ||
1313 | saddrs[i] = GNUNET_malloc (saddrlens[i]); | ||
1314 | GNUNET_memcpy (saddrs[i], pos->ai_addr, saddrlens[i]); | ||
1315 | ((struct sockaddr_in *) saddrs[i])->sin_port = htons (port); | ||
1316 | } | ||
1317 | else | ||
1318 | { | ||
1319 | GNUNET_assert (AF_INET6 == pos->ai_family); | ||
1320 | GNUNET_assert (sizeof (struct sockaddr_in6) == pos->ai_addrlen); | ||
1321 | saddrlens[i] = pos->ai_addrlen; | ||
1322 | saddrs[i] = GNUNET_malloc (saddrlens[i]); | ||
1323 | GNUNET_memcpy (saddrs[i], pos->ai_addr, saddrlens[i]); | ||
1324 | ((struct sockaddr_in6 *) saddrs[i])->sin6_port = htons (port); | ||
1325 | } | ||
1326 | i++; | ||
1327 | } | ||
1328 | GNUNET_free (hostname); | ||
1329 | freeaddrinfo (res); | ||
1330 | resi = i; | ||
1331 | } | ||
1332 | else | ||
1333 | { | ||
1334 | /* will bind against everything, just set port */ | ||
1335 | if (disablev6) | ||
1336 | { | ||
1337 | /* V4-only */ | ||
1338 | resi = 1; | ||
1339 | if (NULL != unixpath) | ||
1340 | resi++; | ||
1341 | i = 0; | ||
1342 | saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *)); | ||
1343 | saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t)); | ||
1344 | if (NULL != unixpath) | ||
1345 | { | ||
1346 | add_unixpath (saddrs, saddrlens, unixpath, abstract); | ||
1347 | i++; | ||
1348 | } | ||
1349 | saddrlens[i] = sizeof (struct sockaddr_in); | ||
1350 | saddrs[i] = GNUNET_malloc (saddrlens[i]); | ||
1351 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
1352 | ((struct sockaddr_in *) saddrs[i])->sin_len = saddrlens[i]; | ||
1353 | #endif | ||
1354 | ((struct sockaddr_in *) saddrs[i])->sin_family = AF_INET; | ||
1355 | ((struct sockaddr_in *) saddrs[i])->sin_port = htons (port); | ||
1356 | } | ||
1357 | else | ||
1358 | { | ||
1359 | /* dual stack */ | ||
1360 | resi = 2; | ||
1361 | if (NULL != unixpath) | ||
1362 | resi++; | ||
1363 | saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *)); | ||
1364 | saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t)); | ||
1365 | i = 0; | ||
1366 | if (NULL != unixpath) | ||
1367 | { | ||
1368 | add_unixpath (saddrs, saddrlens, unixpath, abstract); | ||
1369 | i++; | ||
1370 | } | ||
1371 | saddrlens[i] = sizeof (struct sockaddr_in6); | ||
1372 | saddrs[i] = GNUNET_malloc (saddrlens[i]); | ||
1373 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
1374 | ((struct sockaddr_in6 *) saddrs[i])->sin6_len = saddrlens[0]; | ||
1375 | #endif | ||
1376 | ((struct sockaddr_in6 *) saddrs[i])->sin6_family = AF_INET6; | ||
1377 | ((struct sockaddr_in6 *) saddrs[i])->sin6_port = htons (port); | ||
1378 | i++; | ||
1379 | saddrlens[i] = sizeof (struct sockaddr_in); | ||
1380 | saddrs[i] = GNUNET_malloc (saddrlens[i]); | ||
1381 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
1382 | ((struct sockaddr_in *) saddrs[i])->sin_len = saddrlens[1]; | ||
1383 | #endif | ||
1384 | ((struct sockaddr_in *) saddrs[i])->sin_family = AF_INET; | ||
1385 | ((struct sockaddr_in *) saddrs[i])->sin_port = htons (port); | ||
1386 | } | ||
1387 | } | ||
1388 | GNUNET_free_non_null (unixpath); | ||
1389 | *addrs = saddrs; | ||
1390 | *addr_lens = saddrlens; | ||
1391 | return resi; | ||
1392 | } | ||
1393 | /* end ancient copy-and-paste */ | ||
1394 | |||
1395 | |||
1396 | /** | ||
1397 | * If a session monitor is attached, notify it about the new | ||
1398 | * session state. | ||
1399 | * | ||
1400 | * @param plugin our plugin | ||
1401 | * @param session session that changed state | ||
1402 | * @param state new state of the session | ||
1403 | */ | ||
1404 | static void | ||
1405 | notify_session_monitor (struct Plugin *plugin, | ||
1406 | struct GNUNET_ATS_Session *session, | ||
1407 | enum GNUNET_TRANSPORT_SessionState state) | ||
1408 | { | ||
1409 | struct GNUNET_TRANSPORT_SessionInfo info; | ||
1410 | |||
1411 | if (NULL == plugin->sic) | ||
1412 | return; | ||
1413 | memset (&info, 0, sizeof (info)); | ||
1414 | info.state = state; | ||
1415 | info.is_inbound = GNUNET_HELLO_address_check_option (session->address, | ||
1416 | GNUNET_HELLO_ADDRESS_INFO_INBOUND); | ||
1417 | info.num_msg_pending = session->msgs_in_queue; | ||
1418 | info.num_bytes_pending = session->bytes_in_queue; | ||
1419 | if (NULL != session->receive_delay_task) | ||
1420 | info.receive_delay = session->receive_delay; | ||
1421 | info.session_timeout = session->timeout; | ||
1422 | info.address = session->address; | ||
1423 | plugin->sic (plugin->sic_cls, | ||
1424 | session, | ||
1425 | &info); | ||
1426 | } | ||
1427 | |||
1428 | |||
1429 | /** | ||
1430 | * Our external IP address/port mapping has changed. | ||
1431 | * | ||
1432 | * @param cls closure, the `struct Plugin` | ||
1433 | * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean | ||
1434 | * the previous (now invalid) one | ||
1435 | * @param ac address class the address belongs to | ||
1436 | * @param addr either the previous or the new public IP address | ||
1437 | * @param addrlen actual length of @a addr | ||
1438 | */ | ||
1439 | static void | ||
1440 | tcp_nat_port_map_callback (void *cls, | ||
1441 | int add_remove, | ||
1442 | enum GNUNET_NAT_AddressClass ac, | ||
1443 | const struct sockaddr *addr, | ||
1444 | socklen_t addrlen) | ||
1445 | { | ||
1446 | struct Plugin *plugin = cls; | ||
1447 | struct GNUNET_HELLO_Address *address; | ||
1448 | struct IPv4TcpAddress t4; | ||
1449 | struct IPv6TcpAddress t6; | ||
1450 | void *arg; | ||
1451 | size_t args; | ||
1452 | |||
1453 | if (GNUNET_NAT_AC_LOOPBACK == ac) | ||
1454 | return; | ||
1455 | if (GNUNET_NAT_AC_LAN == ac) | ||
1456 | return; | ||
1457 | if (GNUNET_NAT_AC_LAN_PRIVATE == ac) | ||
1458 | return; | ||
1459 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
1460 | "NAT notification to %s address `%s'\n", | ||
1461 | (GNUNET_YES == add_remove) ? "add" : "remove", | ||
1462 | GNUNET_a2s (addr, addrlen)); | ||
1463 | /* convert 'addr' to our internal format */ | ||
1464 | switch (addr->sa_family) | ||
1465 | { | ||
1466 | case AF_INET: | ||
1467 | GNUNET_assert(addrlen == sizeof(struct sockaddr_in)); | ||
1468 | memset (&t4, 0, sizeof(t4)); | ||
1469 | t4.options = htonl (plugin->myoptions); | ||
1470 | t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr; | ||
1471 | t4.t4_port = ((struct sockaddr_in *) addr)->sin_port; | ||
1472 | arg = &t4; | ||
1473 | args = sizeof (t4); | ||
1474 | break; | ||
1475 | case AF_INET6: | ||
1476 | GNUNET_assert(addrlen == sizeof(struct sockaddr_in6)); | ||
1477 | memset (&t6, 0, sizeof(t6)); | ||
1478 | GNUNET_memcpy (&t6.ipv6_addr, | ||
1479 | &((struct sockaddr_in6 *) addr)->sin6_addr, | ||
1480 | sizeof(struct in6_addr)); | ||
1481 | t6.options = htonl (plugin->myoptions); | ||
1482 | t6.t6_port = ((struct sockaddr_in6 *) addr)->sin6_port; | ||
1483 | arg = &t6; | ||
1484 | args = sizeof (t6); | ||
1485 | break; | ||
1486 | default: | ||
1487 | GNUNET_break(0); | ||
1488 | return; | ||
1489 | } | ||
1490 | /* modify our published address list */ | ||
1491 | GNUNET_assert ((args == sizeof (struct IPv4TcpAddress)) || | ||
1492 | (args == sizeof (struct IPv6TcpAddress))); | ||
1493 | /* TODO: use 'ac' here in the future... */ | ||
1494 | address = GNUNET_HELLO_address_allocate (plugin->env->my_identity, | ||
1495 | PLUGIN_NAME, | ||
1496 | arg, | ||
1497 | args, | ||
1498 | GNUNET_HELLO_ADDRESS_INFO_NONE); | ||
1499 | plugin->env->notify_address (plugin->env->cls, | ||
1500 | add_remove, | ||
1501 | address); | ||
1502 | GNUNET_HELLO_address_free (address); | ||
1503 | } | ||
1504 | |||
1505 | |||
1506 | /** | ||
1507 | * Function called for a quick conversion of the binary address to | ||
1508 | * a numeric address. Note that the caller must not free the | ||
1509 | * address and that the next call to this function is allowed | ||
1510 | * to override the address again. | ||
1511 | * | ||
1512 | * @param cls closure (`struct Plugin*`) | ||
1513 | * @param addr binary address | ||
1514 | * @param addrlen length of @a addr | ||
1515 | * @return string representing the same address | ||
1516 | */ | ||
1517 | static const char * | ||
1518 | tcp_plugin_address_to_string (void *cls, | ||
1519 | const void *addr, | ||
1520 | size_t addrlen) | ||
1521 | { | ||
1522 | static char rbuf[INET6_ADDRSTRLEN + 12]; | ||
1523 | char buf[INET6_ADDRSTRLEN]; | ||
1524 | const void *sb; | ||
1525 | struct in_addr a4; | ||
1526 | struct in6_addr a6; | ||
1527 | const struct IPv4TcpAddress *t4; | ||
1528 | const struct IPv6TcpAddress *t6; | ||
1529 | int af; | ||
1530 | uint16_t port; | ||
1531 | uint32_t options; | ||
1532 | |||
1533 | switch (addrlen) | ||
1534 | { | ||
1535 | case sizeof(struct IPv6TcpAddress): | ||
1536 | t6 = addr; | ||
1537 | af = AF_INET6; | ||
1538 | port = ntohs (t6->t6_port); | ||
1539 | options = ntohl (t6->options); | ||
1540 | GNUNET_memcpy (&a6, &t6->ipv6_addr, sizeof(a6)); | ||
1541 | sb = &a6; | ||
1542 | break; | ||
1543 | case sizeof(struct IPv4TcpAddress): | ||
1544 | t4 = addr; | ||
1545 | af = AF_INET; | ||
1546 | port = ntohs (t4->t4_port); | ||
1547 | options = ntohl (t4->options); | ||
1548 | GNUNET_memcpy (&a4, &t4->ipv4_addr, sizeof(a4)); | ||
1549 | sb = &a4; | ||
1550 | break; | ||
1551 | default: | ||
1552 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
1553 | _("Unexpected address length: %u bytes\n"), | ||
1554 | (unsigned int) addrlen); | ||
1555 | return NULL ; | ||
1556 | } | ||
1557 | if (NULL == inet_ntop (af, sb, buf, INET6_ADDRSTRLEN)) | ||
1558 | { | ||
1559 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, | ||
1560 | "inet_ntop"); | ||
1561 | return NULL ; | ||
1562 | } | ||
1563 | GNUNET_snprintf (rbuf, sizeof(rbuf), | ||
1564 | (af == AF_INET6) ? "%s.%u.[%s]:%u" : "%s.%u.%s:%u", | ||
1565 | PLUGIN_NAME, | ||
1566 | options, | ||
1567 | buf, | ||
1568 | port); | ||
1569 | return rbuf; | ||
1570 | } | ||
1571 | |||
1572 | |||
1573 | /** | ||
1574 | * Function called to convert a string address to | ||
1575 | * a binary address. | ||
1576 | * | ||
1577 | * @param cls closure (`struct Plugin*`) | ||
1578 | * @param addr string address | ||
1579 | * @param addrlen length of the address | ||
1580 | * @param buf location to store the buffer | ||
1581 | * @param added location to store the number of bytes in the buffer. | ||
1582 | * If the function returns #GNUNET_SYSERR, its contents are undefined. | ||
1583 | * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure | ||
1584 | */ | ||
1585 | static int | ||
1586 | tcp_plugin_string_to_address (void *cls, | ||
1587 | const char *addr, | ||
1588 | uint16_t addrlen, | ||
1589 | void **buf, | ||
1590 | size_t *added) | ||
1591 | { | ||
1592 | struct sockaddr_storage socket_address; | ||
1593 | char *address; | ||
1594 | char *plugin; | ||
1595 | char *optionstr; | ||
1596 | uint32_t options; | ||
1597 | |||
1598 | /* Format tcp.options.address:port */ | ||
1599 | address = NULL; | ||
1600 | plugin = NULL; | ||
1601 | optionstr = NULL; | ||
1602 | if ((NULL == addr) || (0 == addrlen)) | ||
1603 | { | ||
1604 | GNUNET_break(0); | ||
1605 | return GNUNET_SYSERR; | ||
1606 | } | ||
1607 | if ('\0' != addr[addrlen - 1]) | ||
1608 | { | ||
1609 | GNUNET_break(0); | ||
1610 | return GNUNET_SYSERR; | ||
1611 | } | ||
1612 | if (strlen (addr) != addrlen - 1) | ||
1613 | { | ||
1614 | GNUNET_break(0); | ||
1615 | return GNUNET_SYSERR; | ||
1616 | } | ||
1617 | plugin = GNUNET_strdup (addr); | ||
1618 | optionstr = strchr (plugin, '.'); | ||
1619 | if (NULL == optionstr) | ||
1620 | { | ||
1621 | GNUNET_break(0); | ||
1622 | GNUNET_free(plugin); | ||
1623 | return GNUNET_SYSERR; | ||
1624 | } | ||
1625 | optionstr[0] = '\0'; | ||
1626 | optionstr++; | ||
1627 | options = atol (optionstr); | ||
1628 | address = strchr (optionstr, '.'); | ||
1629 | if (NULL == address) | ||
1630 | { | ||
1631 | GNUNET_break(0); | ||
1632 | GNUNET_free(plugin); | ||
1633 | return GNUNET_SYSERR; | ||
1634 | } | ||
1635 | address[0] = '\0'; | ||
1636 | address++; | ||
1637 | |||
1638 | if (GNUNET_OK != | ||
1639 | GNUNET_STRINGS_to_address_ip (address, | ||
1640 | strlen (address), | ||
1641 | &socket_address)) | ||
1642 | { | ||
1643 | GNUNET_break(0); | ||
1644 | GNUNET_free(plugin); | ||
1645 | return GNUNET_SYSERR; | ||
1646 | } | ||
1647 | |||
1648 | GNUNET_free(plugin); | ||
1649 | switch (socket_address.ss_family) | ||
1650 | { | ||
1651 | case AF_INET: | ||
1652 | { | ||
1653 | struct IPv4TcpAddress *t4; | ||
1654 | struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address; | ||
1655 | t4 = GNUNET_new (struct IPv4TcpAddress); | ||
1656 | t4->options = htonl (options); | ||
1657 | t4->ipv4_addr = in4->sin_addr.s_addr; | ||
1658 | t4->t4_port = in4->sin_port; | ||
1659 | *buf = t4; | ||
1660 | *added = sizeof(struct IPv4TcpAddress); | ||
1661 | return GNUNET_OK; | ||
1662 | } | ||
1663 | case AF_INET6: | ||
1664 | { | ||
1665 | struct IPv6TcpAddress *t6; | ||
1666 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address; | ||
1667 | t6 = GNUNET_new (struct IPv6TcpAddress); | ||
1668 | t6->options = htonl (options); | ||
1669 | t6->ipv6_addr = in6->sin6_addr; | ||
1670 | t6->t6_port = in6->sin6_port; | ||
1671 | *buf = t6; | ||
1672 | *added = sizeof(struct IPv6TcpAddress); | ||
1673 | return GNUNET_OK; | ||
1674 | } | ||
1675 | default: | ||
1676 | return GNUNET_SYSERR; | ||
1677 | } | ||
1678 | } | ||
1679 | |||
1680 | |||
1681 | /** | ||
1682 | * Find the session handle for the given client. | ||
1683 | * Currently uses both the hashmap and the client | ||
1684 | * context, as the client context is new and the | ||
1685 | * logic still needs to be tested. | ||
1686 | * | ||
1687 | * @param plugin the plugin | ||
1688 | * @param client which client to find the session handle for | ||
1689 | * @return NULL if no matching session exists | ||
1690 | */ | ||
1691 | static struct GNUNET_ATS_Session * | ||
1692 | lookup_session_by_client (struct Plugin *plugin, | ||
1693 | struct GNUNET_SERVER_Client *client) | ||
1694 | { | ||
1695 | return GNUNET_SERVER_client_get_user_context (client, | ||
1696 | struct GNUNET_ATS_Session); | ||
1697 | } | ||
1698 | |||
1699 | |||
1700 | /** | ||
1701 | * Functions with this signature are called whenever we need | ||
1702 | * to close a session due to a disconnect or failure to | ||
1703 | * establish a connection. | ||
1704 | * | ||
1705 | * @param cls the `struct Plugin` | ||
1706 | * @param session session to close down | ||
1707 | * @return #GNUNET_OK on success | ||
1708 | */ | ||
1709 | static int | ||
1710 | tcp_plugin_disconnect_session (void *cls, | ||
1711 | struct GNUNET_ATS_Session *session) | ||
1712 | { | ||
1713 | struct Plugin *plugin = cls; | ||
1714 | struct PendingMessage *pm; | ||
1715 | |||
1716 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
1717 | "Disconnecting session of peer `%s' address `%s'\n", | ||
1718 | GNUNET_i2s (&session->target), | ||
1719 | tcp_plugin_address_to_string (session->plugin, | ||
1720 | session->address->address, | ||
1721 | session->address->address_length)); | ||
1722 | |||
1723 | if (NULL != session->timeout_task) | ||
1724 | { | ||
1725 | GNUNET_SCHEDULER_cancel (session->timeout_task); | ||
1726 | session->timeout_task = NULL; | ||
1727 | session->timeout = GNUNET_TIME_UNIT_ZERO_ABS; | ||
1728 | } | ||
1729 | |||
1730 | if (GNUNET_YES == | ||
1731 | GNUNET_CONTAINER_multipeermap_remove (plugin->sessionmap, | ||
1732 | &session->target, | ||
1733 | session)) | ||
1734 | { | ||
1735 | GNUNET_STATISTICS_update (session->plugin->env->stats, | ||
1736 | gettext_noop ("# TCP sessions active"), | ||
1737 | -1, | ||
1738 | GNUNET_NO); | ||
1739 | } | ||
1740 | else | ||
1741 | { | ||
1742 | GNUNET_assert (GNUNET_YES == | ||
1743 | GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns, | ||
1744 | &session->target, | ||
1745 | session)); | ||
1746 | } | ||
1747 | if (NULL != session->client) | ||
1748 | GNUNET_SERVER_client_set_user_context (session->client, | ||
1749 | NULL); | ||
1750 | |||
1751 | /* clean up state */ | ||
1752 | if (NULL != session->transmit_handle) | ||
1753 | { | ||
1754 | GNUNET_SERVER_notify_transmit_ready_cancel (session->transmit_handle); | ||
1755 | session->transmit_handle = NULL; | ||
1756 | } | ||
1757 | session->plugin->env->session_end (session->plugin->env->cls, | ||
1758 | session->address, | ||
1759 | session); | ||
1760 | |||
1761 | if (NULL != session->nat_connection_timeout) | ||
1762 | { | ||
1763 | GNUNET_SCHEDULER_cancel (session->nat_connection_timeout); | ||
1764 | session->nat_connection_timeout = NULL; | ||
1765 | } | ||
1766 | |||
1767 | while (NULL != (pm = session->pending_messages_head)) | ||
1768 | { | ||
1769 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
1770 | (NULL != pm->transmit_cont) | ||
1771 | ? "Could not deliver message to `%s' at %s.\n" | ||
1772 | : "Could not deliver message to `%s' at %s, notifying.\n", | ||
1773 | GNUNET_i2s (&session->target), | ||
1774 | tcp_plugin_address_to_string (session->plugin, | ||
1775 | session->address->address, | ||
1776 | session->address->address_length)); | ||
1777 | GNUNET_STATISTICS_update (session->plugin->env->stats, | ||
1778 | gettext_noop ("# bytes currently in TCP buffers"), | ||
1779 | -(int64_t) pm->message_size, GNUNET_NO); | ||
1780 | GNUNET_STATISTICS_update (session->plugin->env->stats, | ||
1781 | gettext_noop ("# bytes discarded by TCP (disconnect)"), | ||
1782 | pm->message_size, | ||
1783 | GNUNET_NO); | ||
1784 | GNUNET_CONTAINER_DLL_remove (session->pending_messages_head, | ||
1785 | session->pending_messages_tail, | ||
1786 | pm); | ||
1787 | GNUNET_assert (0 < session->msgs_in_queue); | ||
1788 | session->msgs_in_queue--; | ||
1789 | GNUNET_assert (pm->message_size <= session->bytes_in_queue); | ||
1790 | session->bytes_in_queue -= pm->message_size; | ||
1791 | if (NULL != pm->transmit_cont) | ||
1792 | pm->transmit_cont (pm->transmit_cont_cls, | ||
1793 | &session->target, | ||
1794 | GNUNET_SYSERR, | ||
1795 | pm->message_size, | ||
1796 | 0); | ||
1797 | GNUNET_free (pm); | ||
1798 | } | ||
1799 | GNUNET_assert (0 == session->msgs_in_queue); | ||
1800 | GNUNET_assert (0 == session->bytes_in_queue); | ||
1801 | notify_session_monitor (session->plugin, | ||
1802 | session, | ||
1803 | GNUNET_TRANSPORT_SS_DONE); | ||
1804 | |||
1805 | if (NULL != session->receive_delay_task) | ||
1806 | { | ||
1807 | GNUNET_SCHEDULER_cancel (session->receive_delay_task); | ||
1808 | session->receive_delay_task = NULL; | ||
1809 | } | ||
1810 | if (NULL != session->client) | ||
1811 | { | ||
1812 | GNUNET_SERVER_client_disconnect (session->client); | ||
1813 | session->client = NULL; | ||
1814 | } | ||
1815 | GNUNET_HELLO_address_free (session->address); | ||
1816 | GNUNET_assert (NULL == session->transmit_handle); | ||
1817 | GNUNET_free (session); | ||
1818 | return GNUNET_OK; | ||
1819 | } | ||
1820 | |||
1821 | |||
1822 | /** | ||
1823 | * Function that is called to get the keepalive factor. | ||
1824 | * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to | ||
1825 | * calculate the interval between keepalive packets. | ||
1826 | * | ||
1827 | * @param cls closure with the `struct Plugin` | ||
1828 | * @return keepalive factor | ||
1829 | */ | ||
1830 | static unsigned int | ||
1831 | tcp_plugin_query_keepalive_factor (void *cls) | ||
1832 | { | ||
1833 | return 3; | ||
1834 | } | ||
1835 | |||
1836 | |||
1837 | /** | ||
1838 | * Session was idle for too long, so disconnect it | ||
1839 | * | ||
1840 | * @param cls the `struct GNUNET_ATS_Session` of the idle session | ||
1841 | */ | ||
1842 | static void | ||
1843 | session_timeout (void *cls) | ||
1844 | { | ||
1845 | struct GNUNET_ATS_Session *s = cls; | ||
1846 | struct GNUNET_TIME_Relative left; | ||
1847 | |||
1848 | s->timeout_task = NULL; | ||
1849 | left = GNUNET_TIME_absolute_get_remaining (s->timeout); | ||
1850 | if (0 != left.rel_value_us) | ||
1851 | { | ||
1852 | /* not actually our turn yet, but let's at least update | ||
1853 | the monitor, it may think we're about to die ... */ | ||
1854 | notify_session_monitor (s->plugin, | ||
1855 | s, | ||
1856 | GNUNET_TRANSPORT_SS_UPDATE); | ||
1857 | s->timeout_task = GNUNET_SCHEDULER_add_delayed (left, | ||
1858 | &session_timeout, | ||
1859 | s); | ||
1860 | return; | ||
1861 | } | ||
1862 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
1863 | "Session %p was idle for %s, disconnecting\n", | ||
1864 | s, | ||
1865 | GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, | ||
1866 | GNUNET_YES)); | ||
1867 | /* call session destroy function */ | ||
1868 | tcp_plugin_disconnect_session (s->plugin, | ||
1869 | s); | ||
1870 | } | ||
1871 | |||
1872 | |||
1873 | /** | ||
1874 | * Increment session timeout due to activity. | ||
1875 | * | ||
1876 | * @param s session to increment timeout for | ||
1877 | */ | ||
1878 | static void | ||
1879 | reschedule_session_timeout (struct GNUNET_ATS_Session *s) | ||
1880 | { | ||
1881 | GNUNET_assert (NULL != s->timeout_task); | ||
1882 | s->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT); | ||
1883 | } | ||
1884 | |||
1885 | |||
1886 | /** | ||
1887 | * Create a new session. Also queues a welcome message. | ||
1888 | * | ||
1889 | * @param plugin the plugin | ||
1890 | * @param address the address to create the session for | ||
1891 | * @param scope network scope the address is from | ||
1892 | * @param client client to use, reference counter must have already been increased | ||
1893 | * @param is_nat this a NAT session, we should wait for a client to | ||
1894 | * connect to us from an address, then assign that to | ||
1895 | * the session | ||
1896 | * @return new session object | ||
1897 | */ | ||
1898 | static struct GNUNET_ATS_Session * | ||
1899 | create_session (struct Plugin *plugin, | ||
1900 | const struct GNUNET_HELLO_Address *address, | ||
1901 | enum GNUNET_NetworkType scope, | ||
1902 | struct GNUNET_SERVER_Client *client, | ||
1903 | int is_nat) | ||
1904 | { | ||
1905 | struct GNUNET_ATS_Session *session; | ||
1906 | struct PendingMessage *pm; | ||
1907 | |||
1908 | if (GNUNET_YES != is_nat) | ||
1909 | GNUNET_assert (NULL != client); | ||
1910 | else | ||
1911 | GNUNET_assert (NULL == client); | ||
1912 | |||
1913 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
1914 | "Creating new session for peer `%s' at address %s\n", | ||
1915 | GNUNET_i2s (&address->peer), | ||
1916 | tcp_plugin_address_to_string (plugin, | ||
1917 | address->address, | ||
1918 | address->address_length)); | ||
1919 | session = GNUNET_new (struct GNUNET_ATS_Session); | ||
1920 | session->last_activity = GNUNET_TIME_absolute_get (); | ||
1921 | session->plugin = plugin; | ||
1922 | session->is_nat = is_nat; | ||
1923 | if (NULL != client) | ||
1924 | { | ||
1925 | session->client = client; | ||
1926 | GNUNET_SERVER_client_set_user_context (client, | ||
1927 | session); | ||
1928 | } | ||
1929 | session->address = GNUNET_HELLO_address_copy (address); | ||
1930 | session->target = address->peer; | ||
1931 | session->expecting_welcome = GNUNET_YES; | ||
1932 | session->scope = scope; | ||
1933 | pm = GNUNET_malloc (sizeof (struct PendingMessage) + | ||
1934 | sizeof (struct WelcomeMessage)); | ||
1935 | pm->msg = (const char *) &pm[1]; | ||
1936 | pm->message_size = sizeof(struct WelcomeMessage); | ||
1937 | GNUNET_memcpy (&pm[1], | ||
1938 | &plugin->my_welcome, | ||
1939 | sizeof(struct WelcomeMessage)); | ||
1940 | pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS; | ||
1941 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1942 | gettext_noop ("# bytes currently in TCP buffers"), | ||
1943 | pm->message_size, | ||
1944 | GNUNET_NO); | ||
1945 | GNUNET_CONTAINER_DLL_insert (session->pending_messages_head, | ||
1946 | session->pending_messages_tail, | ||
1947 | pm); | ||
1948 | session->msgs_in_queue++; | ||
1949 | session->bytes_in_queue += pm->message_size; | ||
1950 | session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT); | ||
1951 | session->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, | ||
1952 | &session_timeout, | ||
1953 | session); | ||
1954 | notify_session_monitor (session->plugin, | ||
1955 | session, | ||
1956 | GNUNET_TRANSPORT_SS_INIT); | ||
1957 | if (GNUNET_YES != is_nat) | ||
1958 | { | ||
1959 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
1960 | gettext_noop ("# TCP sessions active"), | ||
1961 | 1, | ||
1962 | GNUNET_NO); | ||
1963 | notify_session_monitor (session->plugin, | ||
1964 | session, | ||
1965 | GNUNET_TRANSPORT_SS_UP); | ||
1966 | } | ||
1967 | else | ||
1968 | { | ||
1969 | notify_session_monitor (session->plugin, | ||
1970 | session, | ||
1971 | GNUNET_TRANSPORT_SS_HANDSHAKE); | ||
1972 | } | ||
1973 | return session; | ||
1974 | } | ||
1975 | |||
1976 | |||
1977 | /** | ||
1978 | * If we have pending messages, ask the server to | ||
1979 | * transmit them (schedule the respective tasks, etc.) | ||
1980 | * | ||
1981 | * @param session for which session should we do this | ||
1982 | */ | ||
1983 | static void | ||
1984 | process_pending_messages (struct GNUNET_ATS_Session *session); | ||
1985 | |||
1986 | |||
1987 | /** | ||
1988 | * Function called to notify a client about the socket | ||
1989 | * being ready to queue more data. "buf" will be | ||
1990 | * NULL and "size" zero if the socket was closed for | ||
1991 | * writing in the meantime. | ||
1992 | * | ||
1993 | * @param cls closure | ||
1994 | * @param size number of bytes available in @a buf | ||
1995 | * @param buf where the callee should write the message | ||
1996 | * @return number of bytes written to @a buf | ||
1997 | */ | ||
1998 | static size_t | ||
1999 | do_transmit (void *cls, | ||
2000 | size_t size, | ||
2001 | void *buf) | ||
2002 | { | ||
2003 | struct GNUNET_ATS_Session *session = cls; | ||
2004 | struct GNUNET_PeerIdentity pid; | ||
2005 | struct Plugin *plugin; | ||
2006 | struct PendingMessage *pos; | ||
2007 | struct PendingMessage *hd; | ||
2008 | struct PendingMessage *tl; | ||
2009 | struct GNUNET_TIME_Absolute now; | ||
2010 | char *cbuf; | ||
2011 | size_t ret; | ||
2012 | |||
2013 | session->transmit_handle = NULL; | ||
2014 | plugin = session->plugin; | ||
2015 | if (NULL == buf) | ||
2016 | { | ||
2017 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2018 | "Timeout trying to transmit to peer `%s', discarding message queue.\n", | ||
2019 | GNUNET_i2s (&session->target)); | ||
2020 | /* timeout; cancel all messages that have already expired */ | ||
2021 | hd = NULL; | ||
2022 | tl = NULL; | ||
2023 | ret = 0; | ||
2024 | now = GNUNET_TIME_absolute_get (); | ||
2025 | while ( (NULL != (pos = session->pending_messages_head)) && | ||
2026 | (pos->timeout.abs_value_us <= now.abs_value_us) ) | ||
2027 | { | ||
2028 | GNUNET_CONTAINER_DLL_remove (session->pending_messages_head, | ||
2029 | session->pending_messages_tail, | ||
2030 | pos); | ||
2031 | GNUNET_assert (0 < session->msgs_in_queue); | ||
2032 | session->msgs_in_queue--; | ||
2033 | GNUNET_assert (pos->message_size <= session->bytes_in_queue); | ||
2034 | session->bytes_in_queue -= pos->message_size; | ||
2035 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2036 | "Failed to transmit %u byte message to `%s'.\n", | ||
2037 | pos->message_size, | ||
2038 | GNUNET_i2s (&session->target)); | ||
2039 | ret += pos->message_size; | ||
2040 | GNUNET_CONTAINER_DLL_insert_after (hd, | ||
2041 | tl, | ||
2042 | tl, | ||
2043 | pos); | ||
2044 | } | ||
2045 | /* do this call before callbacks (so that if callbacks destroy | ||
2046 | * session, they have a chance to cancel actions done by this | ||
2047 | * call) */ | ||
2048 | process_pending_messages (session); | ||
2049 | pid = session->target; | ||
2050 | /* no do callbacks and do not use session again since | ||
2051 | * the callbacks may abort the session */ | ||
2052 | while (NULL != (pos = hd)) | ||
2053 | { | ||
2054 | GNUNET_CONTAINER_DLL_remove (hd, | ||
2055 | tl, | ||
2056 | pos); | ||
2057 | if (NULL != pos->transmit_cont) | ||
2058 | pos->transmit_cont (pos->transmit_cont_cls, | ||
2059 | &pid, | ||
2060 | GNUNET_SYSERR, | ||
2061 | pos->message_size, | ||
2062 | 0); | ||
2063 | GNUNET_free (pos); | ||
2064 | } | ||
2065 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2066 | gettext_noop ("# bytes currently in TCP buffers"), -(int64_t) ret, | ||
2067 | GNUNET_NO); | ||
2068 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2069 | gettext_noop ("# bytes discarded by TCP (timeout)"), | ||
2070 | ret, | ||
2071 | GNUNET_NO); | ||
2072 | if (0 < ret) | ||
2073 | notify_session_monitor (session->plugin, | ||
2074 | session, | ||
2075 | GNUNET_TRANSPORT_SS_UPDATE); | ||
2076 | return 0; | ||
2077 | } | ||
2078 | /* copy all pending messages that would fit */ | ||
2079 | ret = 0; | ||
2080 | cbuf = buf; | ||
2081 | hd = NULL; | ||
2082 | tl = NULL; | ||
2083 | while (NULL != (pos = session->pending_messages_head)) | ||
2084 | { | ||
2085 | if (ret + pos->message_size > size) | ||
2086 | break; | ||
2087 | GNUNET_CONTAINER_DLL_remove (session->pending_messages_head, | ||
2088 | session->pending_messages_tail, | ||
2089 | pos); | ||
2090 | GNUNET_assert (0 < session->msgs_in_queue); | ||
2091 | session->msgs_in_queue--; | ||
2092 | GNUNET_assert (pos->message_size <= session->bytes_in_queue); | ||
2093 | session->bytes_in_queue -= pos->message_size; | ||
2094 | GNUNET_assert(size >= pos->message_size); | ||
2095 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2096 | "Transmitting message of type %u size %u to peer %s at %s\n", | ||
2097 | ntohs (((struct GNUNET_MessageHeader *) pos->msg)->type), | ||
2098 | pos->message_size, | ||
2099 | GNUNET_i2s (&session->target), | ||
2100 | tcp_plugin_address_to_string (session->plugin, | ||
2101 | session->address->address, | ||
2102 | session->address->address_length)); | ||
2103 | /* FIXME: this GNUNET_memcpy can be up to 7% of our total runtime */ | ||
2104 | GNUNET_memcpy (cbuf, | ||
2105 | pos->msg, | ||
2106 | pos->message_size); | ||
2107 | cbuf += pos->message_size; | ||
2108 | ret += pos->message_size; | ||
2109 | size -= pos->message_size; | ||
2110 | GNUNET_CONTAINER_DLL_insert_tail (hd, | ||
2111 | tl, | ||
2112 | pos); | ||
2113 | } | ||
2114 | notify_session_monitor (session->plugin, | ||
2115 | session, | ||
2116 | GNUNET_TRANSPORT_SS_UPDATE); | ||
2117 | /* schedule 'continuation' before callbacks so that callbacks that | ||
2118 | * cancel everything don't cause us to use a session that no longer | ||
2119 | * exists... */ | ||
2120 | process_pending_messages (session); | ||
2121 | session->last_activity = GNUNET_TIME_absolute_get (); | ||
2122 | pid = session->target; | ||
2123 | /* we'll now call callbacks that may cancel the session; hence | ||
2124 | * we should not use 'session' after this point */ | ||
2125 | while (NULL != (pos = hd)) | ||
2126 | { | ||
2127 | GNUNET_CONTAINER_DLL_remove (hd, tl, pos); | ||
2128 | if (NULL != pos->transmit_cont) | ||
2129 | pos->transmit_cont (pos->transmit_cont_cls, | ||
2130 | &pid, | ||
2131 | GNUNET_OK, | ||
2132 | pos->message_size, | ||
2133 | pos->message_size); /* FIXME: include TCP overhead */ | ||
2134 | GNUNET_free (pos); | ||
2135 | } | ||
2136 | GNUNET_assert (NULL == hd); | ||
2137 | GNUNET_assert (NULL == tl); | ||
2138 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2139 | gettext_noop ("# bytes currently in TCP buffers"), | ||
2140 | - (int64_t) ret, | ||
2141 | GNUNET_NO); | ||
2142 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2143 | gettext_noop ("# bytes transmitted via TCP"), | ||
2144 | ret, | ||
2145 | GNUNET_NO); | ||
2146 | return ret; | ||
2147 | } | ||
2148 | |||
2149 | |||
2150 | /** | ||
2151 | * If we have pending messages, ask the server to | ||
2152 | * transmit them (schedule the respective tasks, etc.) | ||
2153 | * | ||
2154 | * @param session for which session should we do this | ||
2155 | */ | ||
2156 | static void | ||
2157 | process_pending_messages (struct GNUNET_ATS_Session *session) | ||
2158 | { | ||
2159 | struct PendingMessage *pm; | ||
2160 | |||
2161 | GNUNET_assert (NULL != session->client); | ||
2162 | if (NULL != session->transmit_handle) | ||
2163 | return; | ||
2164 | if (NULL == (pm = session->pending_messages_head)) | ||
2165 | return; | ||
2166 | |||
2167 | session->transmit_handle | ||
2168 | = GNUNET_SERVER_notify_transmit_ready (session->client, | ||
2169 | pm->message_size, | ||
2170 | GNUNET_TIME_absolute_get_remaining (pm->timeout), | ||
2171 | &do_transmit, | ||
2172 | session); | ||
2173 | } | ||
2174 | |||
2175 | |||
2176 | /** | ||
2177 | * Function that can be used by the transport service to transmit | ||
2178 | * a message using the plugin. Note that in the case of a | ||
2179 | * peer disconnecting, the continuation MUST be called | ||
2180 | * prior to the disconnect notification itself. This function | ||
2181 | * will be called with this peer's HELLO message to initiate | ||
2182 | * a fresh connection to another peer. | ||
2183 | * | ||
2184 | * @param cls closure | ||
2185 | * @param session which session must be used | ||
2186 | * @param msgbuf the message to transmit | ||
2187 | * @param msgbuf_size number of bytes in @a msgbuf | ||
2188 | * @param priority how important is the message (most plugins will | ||
2189 | * ignore message priority and just FIFO) | ||
2190 | * @param to how long to wait at most for the transmission (does not | ||
2191 | * require plugins to discard the message after the timeout, | ||
2192 | * just advisory for the desired delay; most plugins will ignore | ||
2193 | * this as well) | ||
2194 | * @param cont continuation to call once the message has | ||
2195 | * been transmitted (or if the transport is ready | ||
2196 | * for the next transmission call; or if the | ||
2197 | * peer disconnected...); can be NULL | ||
2198 | * @param cont_cls closure for @a cont | ||
2199 | * @return number of bytes used (on the physical network, with overheads); | ||
2200 | * -1 on hard errors (i.e. address invalid); 0 is a legal value | ||
2201 | * and does NOT mean that the message was not transmitted (DV) | ||
2202 | */ | ||
2203 | static ssize_t | ||
2204 | tcp_plugin_send (void *cls, | ||
2205 | struct GNUNET_ATS_Session *session, | ||
2206 | const char *msgbuf, | ||
2207 | size_t msgbuf_size, | ||
2208 | unsigned int priority, | ||
2209 | struct GNUNET_TIME_Relative to, | ||
2210 | GNUNET_TRANSPORT_TransmitContinuation cont, | ||
2211 | void *cont_cls) | ||
2212 | { | ||
2213 | struct Plugin * plugin = cls; | ||
2214 | struct PendingMessage *pm; | ||
2215 | |||
2216 | /* create new message entry */ | ||
2217 | pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size); | ||
2218 | pm->msg = (const char *) &pm[1]; | ||
2219 | GNUNET_memcpy (&pm[1], msgbuf, msgbuf_size); | ||
2220 | pm->message_size = msgbuf_size; | ||
2221 | pm->timeout = GNUNET_TIME_relative_to_absolute (to); | ||
2222 | pm->transmit_cont = cont; | ||
2223 | pm->transmit_cont_cls = cont_cls; | ||
2224 | |||
2225 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2226 | "Asked to transmit %u bytes to `%s', added message to list.\n", | ||
2227 | msgbuf_size, | ||
2228 | GNUNET_i2s (&session->target)); | ||
2229 | |||
2230 | if (GNUNET_YES == | ||
2231 | GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap, | ||
2232 | &session->target, | ||
2233 | session)) | ||
2234 | { | ||
2235 | GNUNET_assert (NULL != session->client); | ||
2236 | GNUNET_SERVER_client_set_timeout (session->client, | ||
2237 | GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT); | ||
2238 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2239 | gettext_noop ("# bytes currently in TCP buffers"), | ||
2240 | msgbuf_size, | ||
2241 | GNUNET_NO); | ||
2242 | |||
2243 | /* append pm to pending_messages list */ | ||
2244 | GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head, | ||
2245 | session->pending_messages_tail, | ||
2246 | pm); | ||
2247 | notify_session_monitor (session->plugin, | ||
2248 | session, | ||
2249 | GNUNET_TRANSPORT_SS_UPDATE); | ||
2250 | session->msgs_in_queue++; | ||
2251 | session->bytes_in_queue += pm->message_size; | ||
2252 | process_pending_messages (session); | ||
2253 | return msgbuf_size; | ||
2254 | } | ||
2255 | if (GNUNET_YES == | ||
2256 | GNUNET_CONTAINER_multipeermap_contains_value (plugin->nat_wait_conns, | ||
2257 | &session->target, | ||
2258 | session)) | ||
2259 | { | ||
2260 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2261 | "This NAT WAIT session for peer `%s' is not yet ready!\n", | ||
2262 | GNUNET_i2s (&session->target)); | ||
2263 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2264 | gettext_noop ("# bytes currently in TCP buffers"), msgbuf_size, | ||
2265 | GNUNET_NO); | ||
2266 | /* append pm to pending_messages list */ | ||
2267 | GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head, | ||
2268 | session->pending_messages_tail, | ||
2269 | pm); | ||
2270 | session->msgs_in_queue++; | ||
2271 | session->bytes_in_queue += pm->message_size; | ||
2272 | notify_session_monitor (session->plugin, | ||
2273 | session, | ||
2274 | GNUNET_TRANSPORT_SS_HANDSHAKE); | ||
2275 | return msgbuf_size; | ||
2276 | } | ||
2277 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
2278 | "Invalid session %p\n", | ||
2279 | session); | ||
2280 | if (NULL != cont) | ||
2281 | cont (cont_cls, | ||
2282 | &session->target, | ||
2283 | GNUNET_SYSERR, | ||
2284 | pm->message_size, | ||
2285 | 0); | ||
2286 | GNUNET_break (0); | ||
2287 | GNUNET_free (pm); | ||
2288 | return GNUNET_SYSERR; /* session does not exist here */ | ||
2289 | } | ||
2290 | |||
2291 | |||
2292 | /** | ||
2293 | * Closure for #session_lookup_it(). | ||
2294 | */ | ||
2295 | struct GNUNET_ATS_SessionItCtx | ||
2296 | { | ||
2297 | /** | ||
2298 | * Address we are looking for. | ||
2299 | */ | ||
2300 | const struct GNUNET_HELLO_Address *address; | ||
2301 | |||
2302 | /** | ||
2303 | * Where to store the session (if we found it). | ||
2304 | */ | ||
2305 | struct GNUNET_ATS_Session *result; | ||
2306 | |||
2307 | }; | ||
2308 | |||
2309 | |||
2310 | /** | ||
2311 | * Look for a session by address. | ||
2312 | * | ||
2313 | * @param cls the `struct GNUNET_ATS_SessionItCtx` | ||
2314 | * @param key unused | ||
2315 | * @param value a `struct GNUNET_ATS_Session` | ||
2316 | * @return #GNUNET_YES to continue looking, #GNUNET_NO if we found the session | ||
2317 | */ | ||
2318 | static int | ||
2319 | session_lookup_it (void *cls, | ||
2320 | const struct GNUNET_PeerIdentity *key, | ||
2321 | void *value) | ||
2322 | { | ||
2323 | struct GNUNET_ATS_SessionItCtx *si_ctx = cls; | ||
2324 | struct GNUNET_ATS_Session *session = value; | ||
2325 | |||
2326 | if (0 != | ||
2327 | GNUNET_HELLO_address_cmp (si_ctx->address, | ||
2328 | session->address)) | ||
2329 | return GNUNET_YES; | ||
2330 | si_ctx->result = session; | ||
2331 | return GNUNET_NO; | ||
2332 | } | ||
2333 | |||
2334 | |||
2335 | /** | ||
2336 | * Task cleaning up a NAT connection attempt after timeout | ||
2337 | * | ||
2338 | * @param cls the `struct GNUNET_ATS_Session` | ||
2339 | */ | ||
2340 | static void | ||
2341 | nat_connect_timeout (void *cls) | ||
2342 | { | ||
2343 | struct GNUNET_ATS_Session *session = cls; | ||
2344 | |||
2345 | session->nat_connection_timeout = NULL; | ||
2346 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2347 | "NAT WAIT connection to `%4s' at `%s' could not be established, removing session\n", | ||
2348 | GNUNET_i2s (&session->target), | ||
2349 | tcp_plugin_address_to_string (session->plugin, | ||
2350 | session->address->address, | ||
2351 | session->address->address_length)); | ||
2352 | tcp_plugin_disconnect_session (session->plugin, | ||
2353 | session); | ||
2354 | } | ||
2355 | |||
2356 | |||
2357 | /** | ||
2358 | * Function that will be called whenever the transport service wants to | ||
2359 | * notify the plugin that a session is still active and in use and | ||
2360 | * therefore the session timeout for this session has to be updated | ||
2361 | * | ||
2362 | * @param cls closure | ||
2363 | * @param peer which peer was the session for | ||
2364 | * @param session which session is being updated | ||
2365 | */ | ||
2366 | static void | ||
2367 | tcp_plugin_update_session_timeout (void *cls, | ||
2368 | const struct GNUNET_PeerIdentity *peer, | ||
2369 | struct GNUNET_ATS_Session *session) | ||
2370 | { | ||
2371 | reschedule_session_timeout (session); | ||
2372 | } | ||
2373 | |||
2374 | |||
2375 | /** | ||
2376 | * Task to signal the server that we can continue | ||
2377 | * receiving from the TCP client now. | ||
2378 | * | ||
2379 | * @param cls the `struct GNUNET_ATS_Session *` | ||
2380 | */ | ||
2381 | static void | ||
2382 | delayed_done (void *cls) | ||
2383 | { | ||
2384 | struct GNUNET_ATS_Session *session = cls; | ||
2385 | |||
2386 | session->receive_delay_task = NULL; | ||
2387 | reschedule_session_timeout (session); | ||
2388 | GNUNET_SERVER_receive_done (session->client, | ||
2389 | GNUNET_OK); | ||
2390 | } | ||
2391 | |||
2392 | |||
2393 | /** | ||
2394 | * Function that will be called whenever the transport service wants to | ||
2395 | * notify the plugin that the inbound quota changed and that the plugin | ||
2396 | * should update it's delay for the next receive value | ||
2397 | * | ||
2398 | * @param cls closure | ||
2399 | * @param peer which peer was the session for | ||
2400 | * @param session which session is being updated | ||
2401 | * @param delay new delay to use for receiving | ||
2402 | */ | ||
2403 | static void | ||
2404 | tcp_plugin_update_inbound_delay (void *cls, | ||
2405 | const struct GNUNET_PeerIdentity *peer, | ||
2406 | struct GNUNET_ATS_Session *session, | ||
2407 | struct GNUNET_TIME_Relative delay) | ||
2408 | { | ||
2409 | if (NULL == session->receive_delay_task) | ||
2410 | return; | ||
2411 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2412 | "New inbound delay %s\n", | ||
2413 | GNUNET_STRINGS_relative_time_to_string (delay, | ||
2414 | GNUNET_NO)); | ||
2415 | session->receive_delay = GNUNET_TIME_relative_to_absolute (delay); | ||
2416 | GNUNET_SCHEDULER_cancel (session->receive_delay_task); | ||
2417 | session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay, | ||
2418 | &delayed_done, | ||
2419 | session); | ||
2420 | } | ||
2421 | |||
2422 | |||
2423 | /** | ||
2424 | * Create a new session to transmit data to the target | ||
2425 | * This session will used to send data to this peer and the plugin will | ||
2426 | * notify us by calling the env->session_end function | ||
2427 | * | ||
2428 | * @param cls closure | ||
2429 | * @param address the address to use | ||
2430 | * @return the session if the address is valid, NULL otherwise | ||
2431 | */ | ||
2432 | static struct GNUNET_ATS_Session * | ||
2433 | tcp_plugin_get_session (void *cls, | ||
2434 | const struct GNUNET_HELLO_Address *address) | ||
2435 | { | ||
2436 | struct Plugin *plugin = cls; | ||
2437 | struct GNUNET_ATS_Session *session = NULL; | ||
2438 | int af; | ||
2439 | const void *sb; | ||
2440 | size_t sbs; | ||
2441 | struct GNUNET_CONNECTION_Handle *sa; | ||
2442 | struct sockaddr_in a4; | ||
2443 | struct sockaddr_in6 a6; | ||
2444 | const struct IPv4TcpAddress *t4; | ||
2445 | const struct IPv6TcpAddress *t6; | ||
2446 | unsigned int options; | ||
2447 | enum GNUNET_NetworkType net_type; | ||
2448 | unsigned int is_natd = GNUNET_NO; | ||
2449 | size_t addrlen; | ||
2450 | #ifdef TCP_STEALTH | ||
2451 | struct GNUNET_NETWORK_Handle *s; | ||
2452 | #endif | ||
2453 | |||
2454 | addrlen = address->address_length; | ||
2455 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2456 | "Trying to get session for `%s' address of peer `%s'\n", | ||
2457 | tcp_plugin_address_to_string (plugin, | ||
2458 | address->address, | ||
2459 | address->address_length), | ||
2460 | GNUNET_i2s (&address->peer)); | ||
2461 | |||
2462 | if (GNUNET_HELLO_address_check_option (address, | ||
2463 | GNUNET_HELLO_ADDRESS_INFO_INBOUND)) | ||
2464 | { | ||
2465 | GNUNET_break (0); | ||
2466 | return NULL; | ||
2467 | } | ||
2468 | |||
2469 | /* look for existing session */ | ||
2470 | if (GNUNET_YES == | ||
2471 | GNUNET_CONTAINER_multipeermap_contains (plugin->sessionmap, | ||
2472 | &address->peer)) | ||
2473 | { | ||
2474 | struct GNUNET_ATS_SessionItCtx si_ctx; | ||
2475 | |||
2476 | si_ctx.address = address; | ||
2477 | si_ctx.result = NULL; | ||
2478 | GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap, | ||
2479 | &address->peer, | ||
2480 | &session_lookup_it, | ||
2481 | &si_ctx); | ||
2482 | if (NULL != si_ctx.result) | ||
2483 | { | ||
2484 | session = si_ctx.result; | ||
2485 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2486 | "Found existing session for `%s' address `%s'\n", | ||
2487 | GNUNET_i2s (&address->peer), | ||
2488 | tcp_plugin_address_to_string (plugin, | ||
2489 | address->address, | ||
2490 | address->address_length)); | ||
2491 | return session; | ||
2492 | } | ||
2493 | /* This is a bit of a hack, limiting TCP to never allow more than | ||
2494 | one TCP connection to any given peer at the same time. | ||
2495 | Without this, peers sometimes disagree about which of the TCP | ||
2496 | connections they should use, causing one side to believe that | ||
2497 | they transmit successfully, while the other receives nothing. */ | ||
2498 | return NULL; /* Refuse to have more than one TCP connection per | ||
2499 | peer pair at the same time. */ | ||
2500 | } | ||
2501 | |||
2502 | if (addrlen == sizeof(struct IPv6TcpAddress)) | ||
2503 | { | ||
2504 | GNUNET_assert (NULL != address->address); /* make static analysis happy */ | ||
2505 | t6 = address->address; | ||
2506 | options = t6->options; | ||
2507 | af = AF_INET6; | ||
2508 | memset (&a6, 0, sizeof(a6)); | ||
2509 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
2510 | a6.sin6_len = sizeof (a6); | ||
2511 | #endif | ||
2512 | a6.sin6_family = AF_INET6; | ||
2513 | a6.sin6_port = t6->t6_port; | ||
2514 | if (t6->t6_port == 0) | ||
2515 | is_natd = GNUNET_YES; | ||
2516 | GNUNET_memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr)); | ||
2517 | sb = &a6; | ||
2518 | sbs = sizeof(a6); | ||
2519 | } | ||
2520 | else if (addrlen == sizeof(struct IPv4TcpAddress)) | ||
2521 | { | ||
2522 | GNUNET_assert(NULL != address->address); /* make static analysis happy */ | ||
2523 | t4 = address->address; | ||
2524 | options = t4->options; | ||
2525 | af = AF_INET; | ||
2526 | memset (&a4, 0, sizeof(a4)); | ||
2527 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
2528 | a4.sin_len = sizeof (a4); | ||
2529 | #endif | ||
2530 | a4.sin_family = AF_INET; | ||
2531 | a4.sin_port = t4->t4_port; | ||
2532 | if (t4->t4_port == 0) | ||
2533 | is_natd = GNUNET_YES; | ||
2534 | a4.sin_addr.s_addr = t4->ipv4_addr; | ||
2535 | sb = &a4; | ||
2536 | sbs = sizeof(a4); | ||
2537 | } | ||
2538 | else | ||
2539 | { | ||
2540 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
2541 | gettext_noop ("# requests to create session with invalid address"), | ||
2542 | 1, | ||
2543 | GNUNET_NO); | ||
2544 | return NULL; | ||
2545 | } | ||
2546 | |||
2547 | net_type = plugin->env->get_address_type (plugin->env->cls, | ||
2548 | sb, | ||
2549 | sbs); | ||
2550 | GNUNET_break (net_type != GNUNET_NT_UNSPECIFIED); | ||
2551 | |||
2552 | if ( (is_natd == GNUNET_YES) && | ||
2553 | (addrlen == sizeof(struct IPv6TcpAddress)) ) | ||
2554 | { | ||
2555 | /* NAT client only works with IPv4 addresses */ | ||
2556 | return NULL; | ||
2557 | } | ||
2558 | |||
2559 | if (plugin->cur_connections >= plugin->max_connections) | ||
2560 | { | ||
2561 | /* saturated */ | ||
2562 | return NULL; | ||
2563 | } | ||
2564 | |||
2565 | if ( (is_natd == GNUNET_YES) && | ||
2566 | (GNUNET_YES == | ||
2567 | GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns, | ||
2568 | &address->peer))) | ||
2569 | { | ||
2570 | /* Only do one NAT punch attempt per peer identity */ | ||
2571 | return NULL; | ||
2572 | } | ||
2573 | |||
2574 | if ( (is_natd == GNUNET_YES) && | ||
2575 | (NULL != plugin->nat) && | ||
2576 | (GNUNET_NO == | ||
2577 | GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns, | ||
2578 | &address->peer))) | ||
2579 | { | ||
2580 | struct sockaddr_in local_sa; | ||
2581 | |||
2582 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2583 | "Found valid IPv4 NAT address (creating session)!\n"); | ||
2584 | session = create_session (plugin, | ||
2585 | address, | ||
2586 | net_type, | ||
2587 | NULL, | ||
2588 | GNUNET_YES); | ||
2589 | session->nat_connection_timeout = GNUNET_SCHEDULER_add_delayed (NAT_TIMEOUT, | ||
2590 | &nat_connect_timeout, | ||
2591 | session); | ||
2592 | GNUNET_assert (GNUNET_OK == | ||
2593 | GNUNET_CONTAINER_multipeermap_put (plugin->nat_wait_conns, | ||
2594 | &session->target, | ||
2595 | session, | ||
2596 | GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)); | ||
2597 | |||
2598 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2599 | "Created NAT WAIT connection to `%s' at `%s'\n", | ||
2600 | GNUNET_i2s (&session->target), | ||
2601 | GNUNET_a2s (sb, sbs)); | ||
2602 | memset (&local_sa, | ||
2603 | 0, | ||
2604 | sizeof (local_sa)); | ||
2605 | local_sa.sin_family = AF_INET; | ||
2606 | local_sa.sin_port = htons (plugin->open_port); | ||
2607 | /* We leave sin_address at 0, let the kernel figure it out, | ||
2608 | even if our bind() is more specific. (May want to reconsider | ||
2609 | later.) */ | ||
2610 | if (GNUNET_OK == | ||
2611 | GNUNET_NAT_request_reversal (plugin->nat, | ||
2612 | &local_sa, | ||
2613 | &a4)) | ||
2614 | return session; | ||
2615 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2616 | "Running NAT client for `%s' at `%s' failed\n", | ||
2617 | GNUNET_i2s (&session->target), | ||
2618 | GNUNET_a2s (sb, sbs)); | ||
2619 | tcp_plugin_disconnect_session (plugin, | ||
2620 | session); | ||
2621 | return NULL; | ||
2622 | } | ||
2623 | |||
2624 | /* create new outbound session */ | ||
2625 | if (0 != (options & TCP_OPTIONS_TCP_STEALTH)) | ||
2626 | { | ||
2627 | #ifdef TCP_STEALTH | ||
2628 | s = GNUNET_NETWORK_socket_create (af, SOCK_STREAM, 0); | ||
2629 | if (NULL == s) | ||
2630 | { | ||
2631 | GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK, | ||
2632 | "socket"); | ||
2633 | sa = NULL; | ||
2634 | } | ||
2635 | else | ||
2636 | { | ||
2637 | if ( (GNUNET_OK != | ||
2638 | GNUNET_NETWORK_socket_setsockopt (s, | ||
2639 | IPPROTO_TCP, | ||
2640 | TCP_STEALTH, | ||
2641 | &session->target, | ||
2642 | sizeof (struct GNUNET_PeerIdentity))) || | ||
2643 | (GNUNET_OK != | ||
2644 | GNUNET_NETWORK_socket_setsockopt (s, | ||
2645 | IPPROTO_TCP, | ||
2646 | TCP_STEALTH_INTEGRITY, | ||
2647 | &plugin->my_welcome, | ||
2648 | sizeof (struct WelcomeMessage))) ) | ||
2649 | { | ||
2650 | /* TCP STEALTH not supported by kernel */ | ||
2651 | GNUNET_break (GNUNET_OK == | ||
2652 | GNUNET_NETWORK_socket_close (s)); | ||
2653 | sa = NULL; | ||
2654 | } | ||
2655 | else | ||
2656 | { | ||
2657 | sa = GNUNET_CONNECTION_connect_socket (s, sb, sbs); | ||
2658 | } | ||
2659 | } | ||
2660 | #else | ||
2661 | sa = NULL; | ||
2662 | #endif | ||
2663 | } | ||
2664 | else | ||
2665 | { | ||
2666 | sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs); | ||
2667 | } | ||
2668 | if (NULL == sa) | ||
2669 | { | ||
2670 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2671 | "Failed to create connection to `%s' at `%s'\n", | ||
2672 | GNUNET_i2s (&address->peer), | ||
2673 | GNUNET_a2s (sb, sbs)); | ||
2674 | return NULL; | ||
2675 | } | ||
2676 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2677 | "Asked to transmit to `%s', creating fresh session using address `%s'.\n", | ||
2678 | GNUNET_i2s (&address->peer), | ||
2679 | GNUNET_a2s (sb, sbs)); | ||
2680 | |||
2681 | session = create_session (plugin, | ||
2682 | address, | ||
2683 | net_type, | ||
2684 | GNUNET_SERVER_connect_socket (plugin->server, | ||
2685 | sa), | ||
2686 | GNUNET_NO); | ||
2687 | (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap, | ||
2688 | &session->target, | ||
2689 | session, | ||
2690 | GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); | ||
2691 | /* Send TCP Welcome */ | ||
2692 | process_pending_messages (session); | ||
2693 | |||
2694 | return session; | ||
2695 | } | ||
2696 | |||
2697 | |||
2698 | /** | ||
2699 | * We have been asked to destroy all connections to a particular peer. | ||
2700 | * This function is called on each applicable session and must tear it | ||
2701 | * down. | ||
2702 | * | ||
2703 | * @param cls the `struct Plugin *` | ||
2704 | * @param key the peer which the session belongs to (unused) | ||
2705 | * @param value the `struct GNUNET_ATS_Session` | ||
2706 | * @return #GNUNET_YES (continue to iterate) | ||
2707 | */ | ||
2708 | static int | ||
2709 | session_disconnect_it (void *cls, | ||
2710 | const struct GNUNET_PeerIdentity *key, | ||
2711 | void *value) | ||
2712 | { | ||
2713 | struct Plugin *plugin = cls; | ||
2714 | struct GNUNET_ATS_Session *session = value; | ||
2715 | |||
2716 | GNUNET_STATISTICS_update (session->plugin->env->stats, | ||
2717 | gettext_noop ("# transport-service disconnect requests for TCP"), | ||
2718 | 1, | ||
2719 | GNUNET_NO); | ||
2720 | tcp_plugin_disconnect_session (plugin, | ||
2721 | session); | ||
2722 | return GNUNET_YES; | ||
2723 | } | ||
2724 | |||
2725 | |||
2726 | /** | ||
2727 | * Function that can be called to force a disconnect from the | ||
2728 | * specified neighbour. This should also cancel all previously | ||
2729 | * scheduled transmissions. Obviously the transmission may have been | ||
2730 | * partially completed already, which is OK. The plugin is supposed | ||
2731 | * to close the connection (if applicable) and no longer call the | ||
2732 | * transmit continuation(s). | ||
2733 | * | ||
2734 | * Finally, plugin MUST NOT call the services's receive function to | ||
2735 | * notify the service that the connection to the specified target was | ||
2736 | * closed after a getting this call. | ||
2737 | * | ||
2738 | * @param cls closure | ||
2739 | * @param target peer for which the last transmission is | ||
2740 | * to be cancelled | ||
2741 | */ | ||
2742 | static void | ||
2743 | tcp_plugin_disconnect (void *cls, | ||
2744 | const struct GNUNET_PeerIdentity *target) | ||
2745 | { | ||
2746 | struct Plugin *plugin = cls; | ||
2747 | |||
2748 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
2749 | "Disconnecting peer `%s'\n", | ||
2750 | GNUNET_i2s (target)); | ||
2751 | GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap, | ||
2752 | target, | ||
2753 | &session_disconnect_it, | ||
2754 | plugin); | ||
2755 | GNUNET_CONTAINER_multipeermap_get_multiple (plugin->nat_wait_conns, | ||
2756 | target, | ||
2757 | &session_disconnect_it, | ||
2758 | plugin); | ||
2759 | } | ||
2760 | |||
2761 | |||
2762 | /** | ||
2763 | * We are processing an address pretty printing request and finished | ||
2764 | * the IP resolution (if applicable). Append our port and forward the | ||
2765 | * result. If called with @a hostname NULL, we are done and should | ||
2766 | * clean up the pretty printer (otherwise, there might be multiple | ||
2767 | * hostnames for the IP address and we might receive more). | ||
2768 | * | ||
2769 | * @param cls the `struct PrettyPrinterContext *` | ||
2770 | * @param hostname hostname part of the address | ||
2771 | */ | ||
2772 | static void | ||
2773 | append_port (void *cls, | ||
2774 | const char *hostname) | ||
2775 | { | ||
2776 | struct PrettyPrinterContext *ppc = cls; | ||
2777 | struct Plugin *plugin = ppc->plugin; | ||
2778 | char *ret; | ||
2779 | |||
2780 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
2781 | "append_port called with hostname `%s'\n", | ||
2782 | hostname); | ||
2783 | if (NULL == hostname) | ||
2784 | { | ||
2785 | /* Final call, done */ | ||
2786 | ppc->resolver_handle = NULL; | ||
2787 | GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head, | ||
2788 | plugin->ppc_dll_tail, | ||
2789 | ppc); | ||
2790 | ppc->asc (ppc->asc_cls, | ||
2791 | NULL, | ||
2792 | GNUNET_OK); | ||
2793 | GNUNET_free (ppc); | ||
2794 | return; | ||
2795 | } | ||
2796 | if (GNUNET_YES == ppc->ipv6) | ||
2797 | GNUNET_asprintf (&ret, | ||
2798 | "%s.%u.[%s]:%d", | ||
2799 | PLUGIN_NAME, | ||
2800 | ppc->options, | ||
2801 | hostname, | ||
2802 | ppc->port); | ||
2803 | else | ||
2804 | GNUNET_asprintf (&ret, | ||
2805 | "%s.%u.%s:%d", | ||
2806 | PLUGIN_NAME, | ||
2807 | ppc->options, | ||
2808 | hostname, | ||
2809 | ppc->port); | ||
2810 | ppc->asc (ppc->asc_cls, | ||
2811 | ret, | ||
2812 | GNUNET_OK); | ||
2813 | GNUNET_free (ret); | ||
2814 | } | ||
2815 | |||
2816 | |||
2817 | /** | ||
2818 | * Convert the transports address to a nice, human-readable format. | ||
2819 | * | ||
2820 | * @param cls closure with the `struct Plugin` | ||
2821 | * @param type name of the transport that generated the address | ||
2822 | * @param addr one of the addresses of the host, NULL for the last address | ||
2823 | * the specific address format depends on the transport | ||
2824 | * @param addrlen length of the @a addr | ||
2825 | * @param numeric should (IP) addresses be displayed in numeric form? | ||
2826 | * @param timeout after how long should we give up? | ||
2827 | * @param asc function to call on each string | ||
2828 | * @param asc_cls closure for @a asc | ||
2829 | */ | ||
2830 | static void | ||
2831 | tcp_plugin_address_pretty_printer (void *cls, | ||
2832 | const char *type, | ||
2833 | const void *addr, | ||
2834 | size_t addrlen, | ||
2835 | int numeric, | ||
2836 | struct GNUNET_TIME_Relative timeout, | ||
2837 | GNUNET_TRANSPORT_AddressStringCallback asc, | ||
2838 | void *asc_cls) | ||
2839 | { | ||
2840 | struct Plugin *plugin = cls; | ||
2841 | struct PrettyPrinterContext *ppc; | ||
2842 | const void *sb; | ||
2843 | size_t sbs; | ||
2844 | struct sockaddr_in a4; | ||
2845 | struct sockaddr_in6 a6; | ||
2846 | const struct IPv4TcpAddress *t4; | ||
2847 | const struct IPv6TcpAddress *t6; | ||
2848 | uint16_t port; | ||
2849 | uint32_t options; | ||
2850 | |||
2851 | if (sizeof(struct IPv6TcpAddress) == addrlen) | ||
2852 | { | ||
2853 | t6 = addr; | ||
2854 | memset (&a6, 0, sizeof(a6)); | ||
2855 | a6.sin6_family = AF_INET6; | ||
2856 | a6.sin6_port = t6->t6_port; | ||
2857 | GNUNET_memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr)); | ||
2858 | port = ntohs (t6->t6_port); | ||
2859 | options = ntohl (t6->options); | ||
2860 | sb = &a6; | ||
2861 | sbs = sizeof(a6); | ||
2862 | } | ||
2863 | else if (sizeof(struct IPv4TcpAddress) == addrlen) | ||
2864 | { | ||
2865 | t4 = addr; | ||
2866 | memset (&a4, 0, sizeof(a4)); | ||
2867 | a4.sin_family = AF_INET; | ||
2868 | a4.sin_port = t4->t4_port; | ||
2869 | a4.sin_addr.s_addr = t4->ipv4_addr; | ||
2870 | port = ntohs (t4->t4_port); | ||
2871 | options = ntohl (t4->options); | ||
2872 | sb = &a4; | ||
2873 | sbs = sizeof(a4); | ||
2874 | } | ||
2875 | else | ||
2876 | { | ||
2877 | /* invalid address */ | ||
2878 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
2879 | _("Unexpected address length: %u bytes\n"), | ||
2880 | (unsigned int) addrlen); | ||
2881 | asc (asc_cls, NULL, GNUNET_SYSERR); | ||
2882 | asc (asc_cls, NULL, GNUNET_OK); | ||
2883 | return; | ||
2884 | } | ||
2885 | ppc = GNUNET_new (struct PrettyPrinterContext); | ||
2886 | ppc->plugin = plugin; | ||
2887 | if (addrlen == sizeof(struct IPv6TcpAddress)) | ||
2888 | ppc->ipv6 = GNUNET_YES; | ||
2889 | else | ||
2890 | ppc->ipv6 = GNUNET_NO; | ||
2891 | ppc->asc = asc; | ||
2892 | ppc->asc_cls = asc_cls; | ||
2893 | ppc->port = port; | ||
2894 | ppc->options = options; | ||
2895 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, | ||
2896 | "Starting DNS reverse lookup\n"); | ||
2897 | ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb, | ||
2898 | sbs, | ||
2899 | ! numeric, | ||
2900 | timeout, | ||
2901 | &append_port, | ||
2902 | ppc); | ||
2903 | if (NULL == ppc->resolver_handle) | ||
2904 | { | ||
2905 | GNUNET_break (0); | ||
2906 | GNUNET_free (ppc); | ||
2907 | return; | ||
2908 | } | ||
2909 | GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head, | ||
2910 | plugin->ppc_dll_tail, | ||
2911 | ppc); | ||
2912 | } | ||
2913 | |||
2914 | |||
2915 | /** | ||
2916 | * Function that will be called to check if a binary address for this | ||
2917 | * plugin is well-formed and corresponds to an address for THIS peer | ||
2918 | * (as per our configuration). Naturally, if absolutely necessary, | ||
2919 | * plugins can be a bit conservative in their answer, but in general | ||
2920 | * plugins should make sure that the address does not redirect | ||
2921 | * traffic to a 3rd party that might try to man-in-the-middle our | ||
2922 | * traffic. | ||
2923 | * | ||
2924 | * @param cls closure, our `struct Plugin *` | ||
2925 | * @param addr pointer to the address | ||
2926 | * @param addrlen length of @a addr | ||
2927 | * @return #GNUNET_OK if this is a plausible address for this peer | ||
2928 | * and transport, #GNUNET_SYSERR if not | ||
2929 | */ | ||
2930 | static int | ||
2931 | tcp_plugin_check_address (void *cls, | ||
2932 | const void *addr, | ||
2933 | size_t addrlen) | ||
2934 | { | ||
2935 | struct Plugin *plugin = cls; | ||
2936 | const struct IPv4TcpAddress *v4; | ||
2937 | const struct IPv6TcpAddress *v6; | ||
2938 | |||
2939 | if ( (addrlen != sizeof(struct IPv4TcpAddress)) && | ||
2940 | (addrlen != sizeof(struct IPv6TcpAddress)) ) | ||
2941 | { | ||
2942 | GNUNET_break_op (0); | ||
2943 | return GNUNET_SYSERR; | ||
2944 | } | ||
2945 | |||
2946 | if (addrlen == sizeof(struct IPv4TcpAddress)) | ||
2947 | { | ||
2948 | struct sockaddr_in s4; | ||
2949 | |||
2950 | v4 = (const struct IPv4TcpAddress *) addr; | ||
2951 | if (0 != memcmp (&v4->options, | ||
2952 | &plugin->myoptions, | ||
2953 | sizeof(uint32_t))) | ||
2954 | { | ||
2955 | GNUNET_break (0); | ||
2956 | return GNUNET_SYSERR; | ||
2957 | } | ||
2958 | memset (&s4, 0, sizeof (s4)); | ||
2959 | s4.sin_family = AF_INET; | ||
2960 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
2961 | s4.sin_len = sizeof (s4); | ||
2962 | #endif | ||
2963 | s4.sin_port = v4->t4_port; | ||
2964 | s4.sin_addr.s_addr = v4->ipv4_addr; | ||
2965 | |||
2966 | if (GNUNET_OK != | ||
2967 | GNUNET_NAT_test_address (plugin->nat, | ||
2968 | &s4, | ||
2969 | sizeof (struct sockaddr_in))) | ||
2970 | return GNUNET_SYSERR; | ||
2971 | } | ||
2972 | else | ||
2973 | { | ||
2974 | struct sockaddr_in6 s6; | ||
2975 | |||
2976 | v6 = (const struct IPv6TcpAddress *) addr; | ||
2977 | if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr)) | ||
2978 | { | ||
2979 | GNUNET_break_op (0); | ||
2980 | return GNUNET_SYSERR; | ||
2981 | } | ||
2982 | if (0 != memcmp (&v6->options, | ||
2983 | &plugin->myoptions, | ||
2984 | sizeof (uint32_t))) | ||
2985 | { | ||
2986 | GNUNET_break (0); | ||
2987 | return GNUNET_SYSERR; | ||
2988 | } | ||
2989 | memset (&s6, 0, sizeof (s6)); | ||
2990 | s6.sin6_family = AF_INET6; | ||
2991 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
2992 | s6.sin6_len = sizeof (s6); | ||
2993 | #endif | ||
2994 | s6.sin6_port = v6->t6_port; | ||
2995 | s6.sin6_addr = v6->ipv6_addr; | ||
2996 | |||
2997 | if (GNUNET_OK != | ||
2998 | GNUNET_NAT_test_address (plugin->nat, | ||
2999 | &s6, | ||
3000 | sizeof(struct sockaddr_in6))) | ||
3001 | return GNUNET_SYSERR; | ||
3002 | } | ||
3003 | return GNUNET_OK; | ||
3004 | } | ||
3005 | |||
3006 | |||
3007 | /** | ||
3008 | * We've received a nat probe from this peer via TCP. Finish | ||
3009 | * creating the client session and resume sending of queued | ||
3010 | * messages. | ||
3011 | * | ||
3012 | * @param cls closure | ||
3013 | * @param client identification of the client | ||
3014 | * @param message the actual message | ||
3015 | */ | ||
3016 | static void | ||
3017 | handle_tcp_nat_probe (void *cls, | ||
3018 | struct GNUNET_SERVER_Client *client, | ||
3019 | const struct GNUNET_MessageHeader *message) | ||
3020 | { | ||
3021 | struct Plugin *plugin = cls; | ||
3022 | struct GNUNET_ATS_Session *session; | ||
3023 | const struct TCP_NAT_ProbeMessage *tcp_nat_probe; | ||
3024 | size_t alen; | ||
3025 | void *vaddr; | ||
3026 | struct IPv4TcpAddress *t4; | ||
3027 | struct IPv6TcpAddress *t6; | ||
3028 | const struct sockaddr_in *s4; | ||
3029 | const struct sockaddr_in6 *s6; | ||
3030 | |||
3031 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3032 | "Received NAT probe\n"); | ||
3033 | /* We have received a TCP NAT probe, meaning we (hopefully) initiated | ||
3034 | * a connection to this peer by running gnunet-nat-client. This peer | ||
3035 | * received the punch message and now wants us to use the new connection | ||
3036 | * as the default for that peer. Do so and then send a WELCOME message | ||
3037 | * so we can really be connected! | ||
3038 | */ | ||
3039 | if (ntohs (message->size) != sizeof(struct TCP_NAT_ProbeMessage)) | ||
3040 | { | ||
3041 | GNUNET_break_op(0); | ||
3042 | GNUNET_SERVER_receive_done (client, | ||
3043 | GNUNET_SYSERR); | ||
3044 | return; | ||
3045 | } | ||
3046 | |||
3047 | tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *) message; | ||
3048 | if (0 == memcmp (&tcp_nat_probe->clientIdentity, plugin->env->my_identity, | ||
3049 | sizeof(struct GNUNET_PeerIdentity))) | ||
3050 | { | ||
3051 | /* refuse connections from ourselves */ | ||
3052 | GNUNET_SERVER_receive_done (client, | ||
3053 | GNUNET_SYSERR); | ||
3054 | return; | ||
3055 | } | ||
3056 | |||
3057 | session = GNUNET_CONTAINER_multipeermap_get (plugin->nat_wait_conns, | ||
3058 | &tcp_nat_probe->clientIdentity); | ||
3059 | if (NULL == session) | ||
3060 | { | ||
3061 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3062 | "Did NOT find session for NAT probe!\n"); | ||
3063 | GNUNET_SERVER_receive_done (client, | ||
3064 | GNUNET_OK); | ||
3065 | return; | ||
3066 | } | ||
3067 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3068 | "Found session for NAT probe!\n"); | ||
3069 | |||
3070 | if (NULL != session->nat_connection_timeout) | ||
3071 | { | ||
3072 | GNUNET_SCHEDULER_cancel (session->nat_connection_timeout); | ||
3073 | session->nat_connection_timeout = NULL; | ||
3074 | } | ||
3075 | |||
3076 | if (GNUNET_OK != | ||
3077 | GNUNET_SERVER_client_get_address (client, | ||
3078 | &vaddr, | ||
3079 | &alen)) | ||
3080 | { | ||
3081 | GNUNET_break(0); | ||
3082 | GNUNET_SERVER_receive_done (client, | ||
3083 | GNUNET_SYSERR); | ||
3084 | tcp_plugin_disconnect_session (plugin, | ||
3085 | session); | ||
3086 | return; | ||
3087 | } | ||
3088 | GNUNET_assert (GNUNET_YES == | ||
3089 | GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns, | ||
3090 | &tcp_nat_probe->clientIdentity, | ||
3091 | session)); | ||
3092 | GNUNET_SERVER_client_set_user_context (client, | ||
3093 | session); | ||
3094 | (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap, | ||
3095 | &session->target, | ||
3096 | session, | ||
3097 | GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); | ||
3098 | session->last_activity = GNUNET_TIME_absolute_get (); | ||
3099 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3100 | "Found address `%s' for incoming connection\n", | ||
3101 | GNUNET_a2s (vaddr, alen)); | ||
3102 | switch (((const struct sockaddr *) vaddr)->sa_family) | ||
3103 | { | ||
3104 | case AF_INET: | ||
3105 | s4 = vaddr; | ||
3106 | t4 = GNUNET_new (struct IPv4TcpAddress); | ||
3107 | t4->options = htonl (TCP_OPTIONS_NONE); | ||
3108 | t4->t4_port = s4->sin_port; | ||
3109 | t4->ipv4_addr = s4->sin_addr.s_addr; | ||
3110 | session->address = GNUNET_HELLO_address_allocate (&tcp_nat_probe->clientIdentity, | ||
3111 | PLUGIN_NAME, | ||
3112 | &t4, | ||
3113 | sizeof(struct IPv4TcpAddress), | ||
3114 | GNUNET_HELLO_ADDRESS_INFO_NONE); | ||
3115 | break; | ||
3116 | case AF_INET6: | ||
3117 | s6 = vaddr; | ||
3118 | t6 = GNUNET_new (struct IPv6TcpAddress); | ||
3119 | t6->options = htonl (TCP_OPTIONS_NONE); | ||
3120 | t6->t6_port = s6->sin6_port; | ||
3121 | GNUNET_memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr)); | ||
3122 | session->address = GNUNET_HELLO_address_allocate (&tcp_nat_probe->clientIdentity, | ||
3123 | PLUGIN_NAME, | ||
3124 | &t6, | ||
3125 | sizeof(struct IPv6TcpAddress), | ||
3126 | GNUNET_HELLO_ADDRESS_INFO_NONE); | ||
3127 | break; | ||
3128 | default: | ||
3129 | GNUNET_break_op(0); | ||
3130 | LOG(GNUNET_ERROR_TYPE_DEBUG, | ||
3131 | "Bad address for incoming connection!\n"); | ||
3132 | GNUNET_free(vaddr); | ||
3133 | GNUNET_SERVER_receive_done (client, | ||
3134 | GNUNET_SYSERR); | ||
3135 | tcp_plugin_disconnect_session (plugin, | ||
3136 | session); | ||
3137 | return; | ||
3138 | } | ||
3139 | GNUNET_free (vaddr); | ||
3140 | GNUNET_break (NULL == session->client); | ||
3141 | session->client = client; | ||
3142 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
3143 | gettext_noop ("# TCP sessions active"), | ||
3144 | 1, | ||
3145 | GNUNET_NO); | ||
3146 | process_pending_messages (session); | ||
3147 | GNUNET_SERVER_receive_done (client, | ||
3148 | GNUNET_OK); | ||
3149 | } | ||
3150 | |||
3151 | |||
3152 | /** | ||
3153 | * We've received a welcome from this peer via TCP. Possibly create a | ||
3154 | * fresh client record and send back our welcome. | ||
3155 | * | ||
3156 | * @param cls closure | ||
3157 | * @param client identification of the client | ||
3158 | * @param message the actual message | ||
3159 | */ | ||
3160 | static void | ||
3161 | handle_tcp_welcome (void *cls, | ||
3162 | struct GNUNET_SERVER_Client *client, | ||
3163 | const struct GNUNET_MessageHeader *message) | ||
3164 | { | ||
3165 | struct Plugin *plugin = cls; | ||
3166 | const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message; | ||
3167 | struct GNUNET_HELLO_Address *address; | ||
3168 | struct GNUNET_ATS_Session *session; | ||
3169 | size_t alen; | ||
3170 | void *vaddr; | ||
3171 | struct IPv4TcpAddress t4; | ||
3172 | struct IPv6TcpAddress t6; | ||
3173 | const struct sockaddr_in *s4; | ||
3174 | const struct sockaddr_in6 *s6; | ||
3175 | |||
3176 | if (0 == memcmp (&wm->clientIdentity, | ||
3177 | plugin->env->my_identity, | ||
3178 | sizeof(struct GNUNET_PeerIdentity))) | ||
3179 | { | ||
3180 | /* refuse connections from ourselves */ | ||
3181 | if (GNUNET_OK == | ||
3182 | GNUNET_SERVER_client_get_address (client, | ||
3183 | &vaddr, | ||
3184 | &alen)) | ||
3185 | { | ||
3186 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
3187 | "Received WELCOME message from my own identity `%s' on address `%s'\n", | ||
3188 | GNUNET_i2s (&wm->clientIdentity), | ||
3189 | GNUNET_a2s (vaddr, alen)); | ||
3190 | GNUNET_free (vaddr); | ||
3191 | } | ||
3192 | GNUNET_SERVER_receive_done (client, | ||
3193 | GNUNET_SYSERR); | ||
3194 | return; | ||
3195 | } | ||
3196 | |||
3197 | if (GNUNET_OK == | ||
3198 | GNUNET_SERVER_client_get_address (client, | ||
3199 | &vaddr, | ||
3200 | &alen)) | ||
3201 | { | ||
3202 | LOG(GNUNET_ERROR_TYPE_DEBUG, | ||
3203 | "Received WELCOME message from `%s' on address `%s'\n", | ||
3204 | GNUNET_i2s (&wm->clientIdentity), | ||
3205 | GNUNET_a2s (vaddr, alen)); | ||
3206 | GNUNET_free (vaddr); | ||
3207 | } | ||
3208 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
3209 | gettext_noop ("# TCP WELCOME messages received"), | ||
3210 | 1, | ||
3211 | GNUNET_NO); | ||
3212 | session = lookup_session_by_client (plugin, | ||
3213 | client); | ||
3214 | if (NULL != session) | ||
3215 | { | ||
3216 | if (GNUNET_OK == | ||
3217 | GNUNET_SERVER_client_get_address (client, | ||
3218 | &vaddr, | ||
3219 | &alen)) | ||
3220 | { | ||
3221 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3222 | "Found existing session %p for peer `%s'\n", | ||
3223 | session, | ||
3224 | GNUNET_a2s (vaddr, alen)); | ||
3225 | GNUNET_free (vaddr); | ||
3226 | } | ||
3227 | } | ||
3228 | else | ||
3229 | { | ||
3230 | if (GNUNET_OK == | ||
3231 | GNUNET_SERVER_client_get_address (client, &vaddr, &alen)) | ||
3232 | { | ||
3233 | if (alen == sizeof(struct sockaddr_in)) | ||
3234 | { | ||
3235 | s4 = vaddr; | ||
3236 | memset (&t4, '\0', sizeof (t4)); | ||
3237 | t4.options = htonl (TCP_OPTIONS_NONE); | ||
3238 | t4.t4_port = s4->sin_port; | ||
3239 | t4.ipv4_addr = s4->sin_addr.s_addr; | ||
3240 | address = GNUNET_HELLO_address_allocate (&wm->clientIdentity, | ||
3241 | PLUGIN_NAME, | ||
3242 | &t4, | ||
3243 | sizeof(t4), | ||
3244 | GNUNET_HELLO_ADDRESS_INFO_INBOUND); | ||
3245 | } | ||
3246 | else if (alen == sizeof(struct sockaddr_in6)) | ||
3247 | { | ||
3248 | s6 = vaddr; | ||
3249 | memset (&t6, '\0', sizeof (t6)); | ||
3250 | t6.options = htonl (TCP_OPTIONS_NONE); | ||
3251 | t6.t6_port = s6->sin6_port; | ||
3252 | GNUNET_memcpy (&t6.ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr)); | ||
3253 | address = GNUNET_HELLO_address_allocate (&wm->clientIdentity, | ||
3254 | PLUGIN_NAME, | ||
3255 | &t6, | ||
3256 | sizeof (t6), | ||
3257 | GNUNET_HELLO_ADDRESS_INFO_INBOUND); | ||
3258 | } | ||
3259 | else | ||
3260 | { | ||
3261 | GNUNET_break (0); | ||
3262 | GNUNET_free_non_null (vaddr); | ||
3263 | GNUNET_SERVER_receive_done (client, | ||
3264 | GNUNET_SYSERR); | ||
3265 | return; | ||
3266 | } | ||
3267 | session = create_session (plugin, | ||
3268 | address, | ||
3269 | plugin->env->get_address_type (plugin->env->cls, | ||
3270 | vaddr, | ||
3271 | alen), | ||
3272 | client, | ||
3273 | GNUNET_NO); | ||
3274 | GNUNET_break (GNUNET_NT_UNSPECIFIED != session->scope); | ||
3275 | GNUNET_HELLO_address_free (address); | ||
3276 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3277 | "Creating new%s session %p for peer `%s' client %p\n", | ||
3278 | GNUNET_HELLO_address_check_option (session->address, | ||
3279 | GNUNET_HELLO_ADDRESS_INFO_INBOUND) | ||
3280 | ? " inbound" : "", | ||
3281 | session, | ||
3282 | tcp_plugin_address_to_string (plugin, | ||
3283 | session->address->address, | ||
3284 | session->address->address_length), | ||
3285 | client); | ||
3286 | GNUNET_free (vaddr); | ||
3287 | (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap, | ||
3288 | &session->target, | ||
3289 | session, | ||
3290 | GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); | ||
3291 | /* Notify transport and ATS about new session */ | ||
3292 | plugin->env->session_start (plugin->env->cls, | ||
3293 | session->address, | ||
3294 | session, | ||
3295 | session->scope); | ||
3296 | } | ||
3297 | else | ||
3298 | { | ||
3299 | LOG(GNUNET_ERROR_TYPE_DEBUG, | ||
3300 | "Did not obtain TCP socket address for incoming connection\n"); | ||
3301 | GNUNET_break(0); | ||
3302 | GNUNET_SERVER_receive_done (client, | ||
3303 | GNUNET_SYSERR); | ||
3304 | return; | ||
3305 | } | ||
3306 | } | ||
3307 | |||
3308 | if (GNUNET_YES != session->expecting_welcome) | ||
3309 | { | ||
3310 | GNUNET_break_op (0); | ||
3311 | GNUNET_SERVER_receive_done (client, | ||
3312 | GNUNET_SYSERR); | ||
3313 | return; | ||
3314 | } | ||
3315 | session->last_activity = GNUNET_TIME_absolute_get (); | ||
3316 | session->expecting_welcome = GNUNET_NO; | ||
3317 | |||
3318 | process_pending_messages (session); | ||
3319 | GNUNET_SERVER_client_set_timeout (client, | ||
3320 | GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT); | ||
3321 | GNUNET_SERVER_receive_done (client, | ||
3322 | GNUNET_OK); | ||
3323 | } | ||
3324 | |||
3325 | |||
3326 | /** | ||
3327 | * We've received data for this peer via TCP. Unbox, | ||
3328 | * compute latency and forward. | ||
3329 | * | ||
3330 | * @param cls closure | ||
3331 | * @param client identification of the client | ||
3332 | * @param message the actual message | ||
3333 | */ | ||
3334 | static void | ||
3335 | handle_tcp_data (void *cls, | ||
3336 | struct GNUNET_SERVER_Client *client, | ||
3337 | const struct GNUNET_MessageHeader *message) | ||
3338 | { | ||
3339 | struct Plugin *plugin = cls; | ||
3340 | struct GNUNET_ATS_Session *session; | ||
3341 | struct GNUNET_TIME_Relative delay; | ||
3342 | uint16_t type; | ||
3343 | |||
3344 | type = ntohs (message->type); | ||
3345 | if ( (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) || | ||
3346 | (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type) ) | ||
3347 | { | ||
3348 | /* We don't want to propagate WELCOME and NAT Probe messages up! */ | ||
3349 | GNUNET_SERVER_receive_done (client, | ||
3350 | GNUNET_OK); | ||
3351 | return; | ||
3352 | } | ||
3353 | session = lookup_session_by_client (plugin, client); | ||
3354 | if (NULL == session) | ||
3355 | { | ||
3356 | /* No inbound session found */ | ||
3357 | void *vaddr = NULL; | ||
3358 | size_t alen; | ||
3359 | |||
3360 | GNUNET_assert (GNUNET_OK == | ||
3361 | GNUNET_SERVER_client_get_address (client, | ||
3362 | &vaddr, | ||
3363 | &alen)); | ||
3364 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
3365 | "Received unexpected %u bytes of type %u from `%s'\n", | ||
3366 | (unsigned int) ntohs (message->size), | ||
3367 | (unsigned int) ntohs (message->type), | ||
3368 | GNUNET_a2s (vaddr, | ||
3369 | alen)); | ||
3370 | GNUNET_break_op(0); | ||
3371 | GNUNET_SERVER_receive_done (client, | ||
3372 | GNUNET_SYSERR); | ||
3373 | GNUNET_free_non_null (vaddr); | ||
3374 | return; | ||
3375 | } | ||
3376 | if (GNUNET_YES == session->expecting_welcome) | ||
3377 | { | ||
3378 | /* Session is expecting WELCOME message */ | ||
3379 | void *vaddr = NULL; | ||
3380 | size_t alen; | ||
3381 | |||
3382 | GNUNET_SERVER_client_get_address (client, | ||
3383 | &vaddr, | ||
3384 | &alen); | ||
3385 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
3386 | "Received unexpected %u bytes of type %u from `%s'\n", | ||
3387 | (unsigned int) ntohs (message->size), | ||
3388 | (unsigned int) ntohs (message->type), | ||
3389 | GNUNET_a2s (vaddr, alen)); | ||
3390 | GNUNET_break_op(0); | ||
3391 | GNUNET_SERVER_receive_done (client, | ||
3392 | GNUNET_SYSERR); | ||
3393 | GNUNET_free_non_null (vaddr); | ||
3394 | return; | ||
3395 | } | ||
3396 | |||
3397 | session->last_activity = GNUNET_TIME_absolute_get (); | ||
3398 | { | ||
3399 | void *vaddr = NULL; | ||
3400 | size_t alen; | ||
3401 | |||
3402 | GNUNET_SERVER_client_get_address (client, | ||
3403 | &vaddr, | ||
3404 | &alen); | ||
3405 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3406 | "Passing %u bytes of type %u from `%s' at %s to transport service.\n", | ||
3407 | (unsigned int) ntohs (message->size), | ||
3408 | (unsigned int) ntohs (message->type), | ||
3409 | GNUNET_i2s (&session->target), | ||
3410 | GNUNET_a2s (vaddr, alen)); | ||
3411 | GNUNET_free_non_null (vaddr); | ||
3412 | } | ||
3413 | |||
3414 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
3415 | gettext_noop ("# bytes received via TCP"), | ||
3416 | ntohs (message->size), | ||
3417 | GNUNET_NO); | ||
3418 | |||
3419 | GNUNET_assert (GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap, | ||
3420 | &session->target, | ||
3421 | session)); | ||
3422 | delay = plugin->env->receive (plugin->env->cls, | ||
3423 | session->address, | ||
3424 | session, | ||
3425 | message); | ||
3426 | reschedule_session_timeout (session); | ||
3427 | if (0 == delay.rel_value_us) | ||
3428 | { | ||
3429 | GNUNET_SERVER_receive_done (client, | ||
3430 | GNUNET_OK); | ||
3431 | } | ||
3432 | else | ||
3433 | { | ||
3434 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3435 | "Throttling receiving from `%s' for %s\n", | ||
3436 | GNUNET_i2s (&session->target), | ||
3437 | GNUNET_STRINGS_relative_time_to_string (delay, | ||
3438 | GNUNET_YES)); | ||
3439 | GNUNET_SERVER_disable_receive_done_warning (client); | ||
3440 | GNUNET_assert (NULL == session->receive_delay_task); | ||
3441 | session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay, | ||
3442 | &delayed_done, | ||
3443 | session); | ||
3444 | } | ||
3445 | } | ||
3446 | |||
3447 | |||
3448 | /** | ||
3449 | * Function called whenever a peer is connected on the "SERVER" level. | ||
3450 | * Increments number of active connections and suspends server if we | ||
3451 | * have reached the limit. | ||
3452 | * | ||
3453 | * @param cls closure | ||
3454 | * @param client identification of the client | ||
3455 | */ | ||
3456 | static void | ||
3457 | connect_notify (void *cls, | ||
3458 | struct GNUNET_SERVER_Client *client) | ||
3459 | { | ||
3460 | struct Plugin *plugin = cls; | ||
3461 | |||
3462 | if (NULL == client) | ||
3463 | return; | ||
3464 | plugin->cur_connections++; | ||
3465 | GNUNET_STATISTICS_set (plugin->env->stats, | ||
3466 | gettext_noop ("# TCP server connections active"), | ||
3467 | plugin->cur_connections, | ||
3468 | GNUNET_NO); | ||
3469 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
3470 | gettext_noop ("# TCP server connect events"), | ||
3471 | 1, | ||
3472 | GNUNET_NO); | ||
3473 | if (plugin->cur_connections != plugin->max_connections) | ||
3474 | return; | ||
3475 | GNUNET_log (GNUNET_ERROR_TYPE_WARNING, | ||
3476 | _("TCP connection limit reached, suspending server\n")); | ||
3477 | GNUNET_STATISTICS_update (plugin->env->stats, | ||
3478 | gettext_noop ("# TCP service suspended"), | ||
3479 | 1, | ||
3480 | GNUNET_NO); | ||
3481 | GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */ | ||
3482 | } | ||
3483 | |||
3484 | |||
3485 | /** | ||
3486 | * Function called whenever a peer is disconnected on the "SERVER" | ||
3487 | * level. Cleans up the connection, decrements number of active | ||
3488 | * connections and if applicable resumes listening. | ||
3489 | * | ||
3490 | * @param cls closure | ||
3491 | * @param client identification of the client | ||
3492 | */ | ||
3493 | static void | ||
3494 | disconnect_notify (void *cls, | ||
3495 | struct GNUNET_SERVER_Client *client) | ||
3496 | { | ||
3497 | struct Plugin *plugin = cls; | ||
3498 | struct GNUNET_ATS_Session *session; | ||
3499 | |||
3500 | if (NULL == client) | ||
3501 | return; | ||
3502 | GNUNET_assert (plugin->cur_connections >= 1); | ||
3503 | plugin->cur_connections--; | ||
3504 | session = lookup_session_by_client (plugin, | ||
3505 | client); | ||
3506 | if (NULL == session) | ||
3507 | return; /* unknown, nothing to do */ | ||
3508 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
3509 | "Destroying session of `%s' with %s due to network-level disconnect.\n", | ||
3510 | GNUNET_i2s (&session->target), | ||
3511 | tcp_plugin_address_to_string (session->plugin, | ||
3512 | session->address->address, | ||
3513 | session->address->address_length)); | ||
3514 | |||
3515 | if (plugin->cur_connections == plugin->max_connections) | ||
3516 | { | ||
3517 | GNUNET_STATISTICS_update (session->plugin->env->stats, | ||
3518 | gettext_noop ("# TCP service resumed"), | ||
3519 | 1, | ||
3520 | GNUNET_NO); | ||
3521 | GNUNET_SERVER_resume (plugin->server); /* Resume server */ | ||
3522 | } | ||
3523 | GNUNET_STATISTICS_set (plugin->env->stats, | ||
3524 | gettext_noop ("# TCP server connections active"), | ||
3525 | plugin->cur_connections, | ||
3526 | GNUNET_NO); | ||
3527 | GNUNET_STATISTICS_update (session->plugin->env->stats, | ||
3528 | gettext_noop ("# network-level TCP disconnect events"), | ||
3529 | 1, | ||
3530 | GNUNET_NO); | ||
3531 | tcp_plugin_disconnect_session (plugin, | ||
3532 | session); | ||
3533 | } | ||
3534 | |||
3535 | |||
3536 | /** | ||
3537 | * We can now send a probe message, copy into buffer to really send. | ||
3538 | * | ||
3539 | * @param cls closure, a `struct TCPProbeContext` | ||
3540 | * @param size max size to copy | ||
3541 | * @param buf buffer to copy message to | ||
3542 | * @return number of bytes copied into @a buf | ||
3543 | */ | ||
3544 | static size_t | ||
3545 | notify_send_probe (void *cls, | ||
3546 | size_t size, | ||
3547 | void *buf) | ||
3548 | { | ||
3549 | struct TCPProbeContext *tcp_probe_ctx = cls; | ||
3550 | struct Plugin *plugin = tcp_probe_ctx->plugin; | ||
3551 | size_t ret; | ||
3552 | |||
3553 | tcp_probe_ctx->transmit_handle = NULL; | ||
3554 | GNUNET_CONTAINER_DLL_remove (plugin->probe_head, | ||
3555 | plugin->probe_tail, | ||
3556 | tcp_probe_ctx); | ||
3557 | if (NULL == buf) | ||
3558 | { | ||
3559 | GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock); | ||
3560 | GNUNET_free(tcp_probe_ctx); | ||
3561 | return 0; | ||
3562 | } | ||
3563 | GNUNET_assert(size >= sizeof(tcp_probe_ctx->message)); | ||
3564 | GNUNET_memcpy (buf, | ||
3565 | &tcp_probe_ctx->message, | ||
3566 | sizeof(tcp_probe_ctx->message)); | ||
3567 | GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server, | ||
3568 | tcp_probe_ctx->sock); | ||
3569 | ret = sizeof(tcp_probe_ctx->message); | ||
3570 | GNUNET_free (tcp_probe_ctx); | ||
3571 | return ret; | ||
3572 | } | ||
3573 | |||
3574 | |||
3575 | /** | ||
3576 | * Function called by the NAT subsystem suggesting another peer wants | ||
3577 | * to connect to us via connection reversal. Try to connect back to the | ||
3578 | * given IP. | ||
3579 | * | ||
3580 | * @param cls closure | ||
3581 | * @param addr address to try | ||
3582 | * @param addrlen number of bytes in @a addr | ||
3583 | */ | ||
3584 | static void | ||
3585 | try_connection_reversal (void *cls, | ||
3586 | const struct sockaddr *addr, | ||
3587 | socklen_t addrlen) | ||
3588 | { | ||
3589 | struct Plugin *plugin = cls; | ||
3590 | struct GNUNET_CONNECTION_Handle *sock; | ||
3591 | struct TCPProbeContext *tcp_probe_ctx; | ||
3592 | |||
3593 | /** | ||
3594 | * We have received an ICMP response, ostensibly from a peer | ||
3595 | * that wants to connect to us! Send a message to establish a connection. | ||
3596 | */ | ||
3597 | sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET, | ||
3598 | addr, | ||
3599 | addrlen); | ||
3600 | if (NULL == sock) | ||
3601 | { | ||
3602 | /* failed for some odd reason (out of sockets?); ignore attempt */ | ||
3603 | return; | ||
3604 | } | ||
3605 | |||
3606 | tcp_probe_ctx = GNUNET_new (struct TCPProbeContext); | ||
3607 | tcp_probe_ctx->message.header.size | ||
3608 | = htons (sizeof (struct TCP_NAT_ProbeMessage)); | ||
3609 | tcp_probe_ctx->message.header.type | ||
3610 | = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE); | ||
3611 | tcp_probe_ctx->message.clientIdentity | ||
3612 | = *plugin->env->my_identity; | ||
3613 | tcp_probe_ctx->plugin = plugin; | ||
3614 | tcp_probe_ctx->sock = sock; | ||
3615 | GNUNET_CONTAINER_DLL_insert (plugin->probe_head, | ||
3616 | plugin->probe_tail, | ||
3617 | tcp_probe_ctx); | ||
3618 | tcp_probe_ctx->transmit_handle | ||
3619 | = GNUNET_CONNECTION_notify_transmit_ready (sock, | ||
3620 | ntohs (tcp_probe_ctx->message.header.size), | ||
3621 | GNUNET_TIME_UNIT_FOREVER_REL, | ||
3622 | ¬ify_send_probe, | ||
3623 | tcp_probe_ctx); | ||
3624 | } | ||
3625 | |||
3626 | |||
3627 | /** | ||
3628 | * Function obtain the network type for a session | ||
3629 | * | ||
3630 | * @param cls closure (`struct Plugin *`) | ||
3631 | * @param session the session | ||
3632 | * @return the network type in HBO or #GNUNET_SYSERR | ||
3633 | */ | ||
3634 | static enum GNUNET_NetworkType | ||
3635 | tcp_plugin_get_network (void *cls, | ||
3636 | struct GNUNET_ATS_Session *session) | ||
3637 | { | ||
3638 | return session->scope; | ||
3639 | } | ||
3640 | |||
3641 | |||
3642 | /** | ||
3643 | * Function obtain the network type for an address. | ||
3644 | * | ||
3645 | * @param cls closure (`struct Plugin *`) | ||
3646 | * @param address the address | ||
3647 | * @return the network type | ||
3648 | */ | ||
3649 | static enum GNUNET_NetworkType | ||
3650 | tcp_plugin_get_network_for_address (void *cls, | ||
3651 | const struct GNUNET_HELLO_Address *address) | ||
3652 | { | ||
3653 | struct Plugin *plugin = cls; | ||
3654 | size_t addrlen; | ||
3655 | struct sockaddr_in a4; | ||
3656 | struct sockaddr_in6 a6; | ||
3657 | const struct IPv4TcpAddress *t4; | ||
3658 | const struct IPv6TcpAddress *t6; | ||
3659 | const void *sb; | ||
3660 | size_t sbs; | ||
3661 | |||
3662 | addrlen = address->address_length; | ||
3663 | if (addrlen == sizeof(struct IPv6TcpAddress)) | ||
3664 | { | ||
3665 | GNUNET_assert (NULL != address->address); /* make static analysis happy */ | ||
3666 | t6 = address->address; | ||
3667 | memset (&a6, 0, sizeof(a6)); | ||
3668 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
3669 | a6.sin6_len = sizeof (a6); | ||
3670 | #endif | ||
3671 | a6.sin6_family = AF_INET6; | ||
3672 | a6.sin6_port = t6->t6_port; | ||
3673 | GNUNET_memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr)); | ||
3674 | sb = &a6; | ||
3675 | sbs = sizeof(a6); | ||
3676 | } | ||
3677 | else if (addrlen == sizeof(struct IPv4TcpAddress)) | ||
3678 | { | ||
3679 | GNUNET_assert (NULL != address->address); /* make static analysis happy */ | ||
3680 | t4 = address->address; | ||
3681 | memset (&a4, 0, sizeof(a4)); | ||
3682 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
3683 | a4.sin_len = sizeof (a4); | ||
3684 | #endif | ||
3685 | a4.sin_family = AF_INET; | ||
3686 | a4.sin_port = t4->t4_port; | ||
3687 | a4.sin_addr.s_addr = t4->ipv4_addr; | ||
3688 | sb = &a4; | ||
3689 | sbs = sizeof(a4); | ||
3690 | } | ||
3691 | else | ||
3692 | { | ||
3693 | GNUNET_break (0); | ||
3694 | return GNUNET_NT_UNSPECIFIED; | ||
3695 | } | ||
3696 | return plugin->env->get_address_type (plugin->env->cls, | ||
3697 | sb, | ||
3698 | sbs); | ||
3699 | } | ||
3700 | |||
3701 | |||
3702 | /** | ||
3703 | * Return information about the given session to the | ||
3704 | * monitor callback. | ||
3705 | * | ||
3706 | * @param cls the `struct Plugin` with the monitor callback (`sic`) | ||
3707 | * @param peer peer we send information about | ||
3708 | * @param value our `struct GNUNET_ATS_Session` to send information about | ||
3709 | * @return #GNUNET_OK (continue to iterate) | ||
3710 | */ | ||
3711 | static int | ||
3712 | send_session_info_iter (void *cls, | ||
3713 | const struct GNUNET_PeerIdentity *peer, | ||
3714 | void *value) | ||
3715 | { | ||
3716 | struct Plugin *plugin = cls; | ||
3717 | struct GNUNET_ATS_Session *session = value; | ||
3718 | |||
3719 | notify_session_monitor (plugin, | ||
3720 | session, | ||
3721 | GNUNET_TRANSPORT_SS_INIT); | ||
3722 | /* FIXME: cannot tell if this is up or not from current | ||
3723 | session state... */ | ||
3724 | notify_session_monitor (plugin, | ||
3725 | session, | ||
3726 | GNUNET_TRANSPORT_SS_UP); | ||
3727 | return GNUNET_OK; | ||
3728 | } | ||
3729 | |||
3730 | |||
3731 | /** | ||
3732 | * Begin monitoring sessions of a plugin. There can only | ||
3733 | * be one active monitor per plugin (i.e. if there are | ||
3734 | * multiple monitors, the transport service needs to | ||
3735 | * multiplex the generated events over all of them). | ||
3736 | * | ||
3737 | * @param cls closure of the plugin | ||
3738 | * @param sic callback to invoke, NULL to disable monitor; | ||
3739 | * plugin will being by iterating over all active | ||
3740 | * sessions immediately and then enter monitor mode | ||
3741 | * @param sic_cls closure for @a sic | ||
3742 | */ | ||
3743 | static void | ||
3744 | tcp_plugin_setup_monitor (void *cls, | ||
3745 | GNUNET_TRANSPORT_SessionInfoCallback sic, | ||
3746 | void *sic_cls) | ||
3747 | { | ||
3748 | struct Plugin *plugin = cls; | ||
3749 | |||
3750 | plugin->sic = sic; | ||
3751 | plugin->sic_cls = sic_cls; | ||
3752 | if (NULL != sic) | ||
3753 | { | ||
3754 | GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap, | ||
3755 | &send_session_info_iter, | ||
3756 | plugin); | ||
3757 | /* signal end of first iteration */ | ||
3758 | sic (sic_cls, NULL, NULL); | ||
3759 | } | ||
3760 | } | ||
3761 | |||
3762 | |||
3763 | /** | ||
3764 | * Entry point for the plugin. | ||
3765 | * | ||
3766 | * @param cls closure, the `struct GNUNET_TRANSPORT_PluginEnvironment *` | ||
3767 | * @return the `struct GNUNET_TRANSPORT_PluginFunctions *` or NULL on error | ||
3768 | */ | ||
3769 | void * | ||
3770 | libgnunet_plugin_transport_xt_init (void *cls) | ||
3771 | { | ||
3772 | static const struct GNUNET_SERVER_MessageHandler my_handlers[] = { | ||
3773 | { &handle_tcp_welcome, NULL, | ||
3774 | GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME, | ||
3775 | sizeof(struct WelcomeMessage) }, | ||
3776 | { &handle_tcp_nat_probe, NULL, | ||
3777 | GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE, | ||
3778 | sizeof(struct TCP_NAT_ProbeMessage) }, | ||
3779 | { &handle_tcp_data, NULL, | ||
3780 | GNUNET_MESSAGE_TYPE_ALL, 0 }, | ||
3781 | { NULL, NULL, 0, 0 } | ||
3782 | }; | ||
3783 | struct GNUNET_TRANSPORT_PluginEnvironment *env = cls; | ||
3784 | struct GNUNET_TRANSPORT_PluginFunctions *api; | ||
3785 | struct Plugin *plugin; | ||
3786 | struct LEGACY_SERVICE_Context *service; | ||
3787 | unsigned long long aport; | ||
3788 | unsigned long long bport; | ||
3789 | unsigned long long max_connections; | ||
3790 | unsigned int i; | ||
3791 | struct GNUNET_TIME_Relative idle_timeout; | ||
3792 | #ifdef TCP_STEALTH | ||
3793 | struct GNUNET_NETWORK_Handle *const*lsocks; | ||
3794 | #endif | ||
3795 | int ret; | ||
3796 | int ret_s; | ||
3797 | struct sockaddr **addrs; | ||
3798 | socklen_t *addrlens; | ||
3799 | |||
3800 | if (NULL == env->receive) | ||
3801 | { | ||
3802 | /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully | ||
3803 | initialze the plugin or the API */ | ||
3804 | api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions); | ||
3805 | api->cls = NULL; | ||
3806 | api->address_pretty_printer = &tcp_plugin_address_pretty_printer; | ||
3807 | api->address_to_string = &tcp_plugin_address_to_string; | ||
3808 | api->string_to_address = &tcp_plugin_string_to_address; | ||
3809 | return api; | ||
3810 | } | ||
3811 | |||
3812 | GNUNET_assert (NULL != env->cfg); | ||
3813 | if (GNUNET_OK != | ||
3814 | GNUNET_CONFIGURATION_get_value_number (env->cfg, | ||
3815 | "transport-xt", | ||
3816 | "MAX_CONNECTIONS", | ||
3817 | &max_connections)) | ||
3818 | max_connections = 128; | ||
3819 | |||
3820 | aport = 0; | ||
3821 | if ((GNUNET_OK != | ||
3822 | GNUNET_CONFIGURATION_get_value_number (env->cfg, | ||
3823 | "transport-xt", | ||
3824 | "PORT", &bport)) || | ||
3825 | (bport > 65535) || | ||
3826 | ((GNUNET_OK == | ||
3827 | GNUNET_CONFIGURATION_get_value_number (env->cfg, | ||
3828 | "transport-xt", | ||
3829 | "ADVERTISED-PORT", &aport)) && | ||
3830 | (aport > 65535) )) | ||
3831 | { | ||
3832 | LOG(GNUNET_ERROR_TYPE_ERROR, | ||
3833 | _("Require valid port number for service `%s' in configuration!\n"), | ||
3834 | "transport-xt"); | ||
3835 | return NULL ; | ||
3836 | } | ||
3837 | if (0 == aport) | ||
3838 | aport = bport; | ||
3839 | if (0 == bport) | ||
3840 | aport = 0; | ||
3841 | if (0 != bport) | ||
3842 | { | ||
3843 | service = LEGACY_SERVICE_start ("transport-xt", | ||
3844 | env->cfg, | ||
3845 | LEGACY_SERVICE_OPTION_NONE); | ||
3846 | if (NULL == service) | ||
3847 | { | ||
3848 | LOG (GNUNET_ERROR_TYPE_WARNING, | ||
3849 | _("Failed to start service.\n")); | ||
3850 | return NULL; | ||
3851 | } | ||
3852 | } | ||
3853 | else | ||
3854 | service = NULL; | ||
3855 | |||
3856 | api = NULL; | ||
3857 | plugin = GNUNET_new (struct Plugin); | ||
3858 | plugin->sessionmap = GNUNET_CONTAINER_multipeermap_create (max_connections, | ||
3859 | GNUNET_YES); | ||
3860 | plugin->max_connections = max_connections; | ||
3861 | plugin->open_port = bport; | ||
3862 | plugin->adv_port = aport; | ||
3863 | plugin->env = env; | ||
3864 | plugin->my_welcome.header.size = htons (sizeof(struct WelcomeMessage)); | ||
3865 | plugin->my_welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME); | ||
3866 | plugin->my_welcome.clientIdentity = *plugin->env->my_identity; | ||
3867 | |||
3868 | if ( (NULL != service) && | ||
3869 | (GNUNET_YES == | ||
3870 | GNUNET_CONFIGURATION_get_value_yesno (env->cfg, | ||
3871 | "transport-xt", | ||
3872 | "TCP_STEALTH")) ) | ||
3873 | { | ||
3874 | #ifdef TCP_STEALTH | ||
3875 | plugin->myoptions |= TCP_OPTIONS_TCP_STEALTH; | ||
3876 | lsocks = LEGACY_SERVICE_get_listen_sockets (service); | ||
3877 | if (NULL != lsocks) | ||
3878 | { | ||
3879 | uint32_t len = sizeof (struct WelcomeMessage); | ||
3880 | |||
3881 | for (i=0;NULL!=lsocks[i];i++) | ||
3882 | { | ||
3883 | if ( (GNUNET_OK != | ||
3884 | GNUNET_NETWORK_socket_setsockopt (lsocks[i], | ||
3885 | IPPROTO_TCP, | ||
3886 | TCP_STEALTH, | ||
3887 | env->my_identity, | ||
3888 | sizeof (struct GNUNET_PeerIdentity))) || | ||
3889 | (GNUNET_OK != | ||
3890 | GNUNET_NETWORK_socket_setsockopt (lsocks[i], | ||
3891 | IPPROTO_TCP, | ||
3892 | TCP_STEALTH_INTEGRITY_LEN, | ||
3893 | &len, | ||
3894 | sizeof (len))) ) | ||
3895 | { | ||
3896 | /* TCP STEALTH not supported by kernel */ | ||
3897 | GNUNET_assert (0 == i); | ||
3898 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
3899 | _("TCP_STEALTH not supported on this platform.\n")); | ||
3900 | goto die; | ||
3901 | } | ||
3902 | } | ||
3903 | } | ||
3904 | #else | ||
3905 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
3906 | _("TCP_STEALTH not supported on this platform.\n")); | ||
3907 | goto die; | ||
3908 | #endif | ||
3909 | } | ||
3910 | |||
3911 | if ( (NULL != service) && | ||
3912 | (GNUNET_SYSERR != | ||
3913 | (ret_s = | ||
3914 | get_server_addresses ("transport-xt", | ||
3915 | env->cfg, | ||
3916 | &addrs, | ||
3917 | &addrlens)))) | ||
3918 | { | ||
3919 | for (ret = ret_s-1; ret >= 0; ret--) | ||
3920 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
3921 | "Binding to address `%s'\n", | ||
3922 | GNUNET_a2s (addrs[ret], addrlens[ret])); | ||
3923 | plugin->nat | ||
3924 | = GNUNET_NAT_register (env->cfg, | ||
3925 | "transport-xt", | ||
3926 | IPPROTO_TCP, | ||
3927 | (unsigned int) ret_s, | ||
3928 | (const struct sockaddr **) addrs, | ||
3929 | addrlens, | ||
3930 | &tcp_nat_port_map_callback, | ||
3931 | &try_connection_reversal, | ||
3932 | plugin); | ||
3933 | for (ret = ret_s -1; ret >= 0; ret--) | ||
3934 | GNUNET_free (addrs[ret]); | ||
3935 | GNUNET_free_non_null (addrs); | ||
3936 | GNUNET_free_non_null (addrlens); | ||
3937 | } | ||
3938 | else | ||
3939 | { | ||
3940 | plugin->nat = GNUNET_NAT_register (plugin->env->cfg, | ||
3941 | "transport-xt", | ||
3942 | IPPROTO_TCP, | ||
3943 | 0, | ||
3944 | NULL, | ||
3945 | NULL, | ||
3946 | NULL, | ||
3947 | &try_connection_reversal, | ||
3948 | plugin); | ||
3949 | } | ||
3950 | api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions); | ||
3951 | api->cls = plugin; | ||
3952 | api->send = &tcp_plugin_send; | ||
3953 | api->get_session = &tcp_plugin_get_session; | ||
3954 | api->disconnect_session = &tcp_plugin_disconnect_session; | ||
3955 | api->query_keepalive_factor = &tcp_plugin_query_keepalive_factor; | ||
3956 | api->disconnect_peer = &tcp_plugin_disconnect; | ||
3957 | api->address_pretty_printer = &tcp_plugin_address_pretty_printer; | ||
3958 | api->check_address = &tcp_plugin_check_address; | ||
3959 | api->address_to_string = &tcp_plugin_address_to_string; | ||
3960 | api->string_to_address = &tcp_plugin_string_to_address; | ||
3961 | api->get_network = &tcp_plugin_get_network; | ||
3962 | api->get_network_for_address = &tcp_plugin_get_network_for_address; | ||
3963 | api->update_session_timeout = &tcp_plugin_update_session_timeout; | ||
3964 | api->update_inbound_delay = &tcp_plugin_update_inbound_delay; | ||
3965 | api->setup_monitor = &tcp_plugin_setup_monitor; | ||
3966 | plugin->service = service; | ||
3967 | if (NULL != service) | ||
3968 | { | ||
3969 | plugin->server = LEGACY_SERVICE_get_server (service); | ||
3970 | } | ||
3971 | else | ||
3972 | { | ||
3973 | if (GNUNET_OK != | ||
3974 | GNUNET_CONFIGURATION_get_value_time (env->cfg, | ||
3975 | "transport-xt", | ||
3976 | "TIMEOUT", | ||
3977 | &idle_timeout)) | ||
3978 | { | ||
3979 | GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, | ||
3980 | "transport-xt", | ||
3981 | "TIMEOUT"); | ||
3982 | goto die; | ||
3983 | } | ||
3984 | plugin->server | ||
3985 | = GNUNET_SERVER_create_with_sockets (NULL, | ||
3986 | plugin, | ||
3987 | NULL, | ||
3988 | idle_timeout, | ||
3989 | GNUNET_YES); | ||
3990 | } | ||
3991 | plugin->handlers = GNUNET_malloc (sizeof (my_handlers)); | ||
3992 | GNUNET_memcpy (plugin->handlers, | ||
3993 | my_handlers, | ||
3994 | sizeof(my_handlers)); | ||
3995 | for (i = 0;i < sizeof(my_handlers) / sizeof(struct GNUNET_SERVER_MessageHandler);i++) | ||
3996 | plugin->handlers[i].callback_cls = plugin; | ||
3997 | |||
3998 | GNUNET_SERVER_add_handlers (plugin->server, | ||
3999 | plugin->handlers); | ||
4000 | GNUNET_SERVER_connect_notify (plugin->server, | ||
4001 | &connect_notify, | ||
4002 | plugin); | ||
4003 | GNUNET_SERVER_disconnect_notify (plugin->server, | ||
4004 | &disconnect_notify, | ||
4005 | plugin); | ||
4006 | plugin->nat_wait_conns = GNUNET_CONTAINER_multipeermap_create (16, | ||
4007 | GNUNET_YES); | ||
4008 | if (0 != bport) | ||
4009 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
4010 | _("XT transport listening on port %llu\n"), | ||
4011 | bport); | ||
4012 | else | ||
4013 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
4014 | _("XT transport not listening on any port (client only)\n")); | ||
4015 | if ( (aport != bport) && | ||
4016 | (0 != bport) ) | ||
4017 | LOG (GNUNET_ERROR_TYPE_INFO, | ||
4018 | _("XT transport advertises itself as being on port %llu\n"), | ||
4019 | aport); | ||
4020 | /* Initially set connections to 0 */ | ||
4021 | GNUNET_STATISTICS_set (plugin->env->stats, | ||
4022 | gettext_noop ("# XT sessions active"), | ||
4023 | 0, | ||
4024 | GNUNET_NO); | ||
4025 | return api; | ||
4026 | |||
4027 | die: | ||
4028 | if (NULL != plugin->nat) | ||
4029 | GNUNET_NAT_unregister (plugin->nat); | ||
4030 | GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap); | ||
4031 | if (NULL != service) | ||
4032 | LEGACY_SERVICE_stop (service); | ||
4033 | GNUNET_free (plugin); | ||
4034 | GNUNET_free_non_null (api); | ||
4035 | return NULL; | ||
4036 | } | ||
4037 | |||
4038 | |||
4039 | /** | ||
4040 | * Exit point from the plugin. | ||
4041 | * | ||
4042 | * @param cls the `struct GNUNET_TRANSPORT_PluginFunctions` | ||
4043 | * @return NULL | ||
4044 | */ | ||
4045 | void * | ||
4046 | libgnunet_plugin_transport_xt_done (void *cls) | ||
4047 | { | ||
4048 | struct GNUNET_TRANSPORT_PluginFunctions *api = cls; | ||
4049 | struct Plugin *plugin = api->cls; | ||
4050 | struct TCPProbeContext *tcp_probe; | ||
4051 | struct PrettyPrinterContext *cur; | ||
4052 | struct PrettyPrinterContext *next; | ||
4053 | |||
4054 | if (NULL == plugin) | ||
4055 | { | ||
4056 | GNUNET_free(api); | ||
4057 | return NULL ; | ||
4058 | } | ||
4059 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
4060 | "Shutting down XT plugin\n"); | ||
4061 | |||
4062 | /* Removing leftover sessions */ | ||
4063 | GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap, | ||
4064 | &session_disconnect_it, | ||
4065 | plugin); | ||
4066 | /* Removing leftover NAT sessions */ | ||
4067 | GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns, | ||
4068 | &session_disconnect_it, | ||
4069 | plugin); | ||
4070 | |||
4071 | for (cur = plugin->ppc_dll_head; NULL != cur; cur = next) | ||
4072 | { | ||
4073 | next = cur->next; | ||
4074 | GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head, | ||
4075 | plugin->ppc_dll_tail, | ||
4076 | cur); | ||
4077 | GNUNET_RESOLVER_request_cancel (cur->resolver_handle); | ||
4078 | cur->asc (cur->asc_cls, | ||
4079 | NULL, | ||
4080 | GNUNET_OK); | ||
4081 | GNUNET_free (cur); | ||
4082 | } | ||
4083 | |||
4084 | if (NULL != plugin->service) | ||
4085 | LEGACY_SERVICE_stop (plugin->service); | ||
4086 | else | ||
4087 | GNUNET_SERVER_destroy (plugin->server); | ||
4088 | GNUNET_free (plugin->handlers); | ||
4089 | if (NULL != plugin->nat) | ||
4090 | GNUNET_NAT_unregister (plugin->nat); | ||
4091 | while (NULL != (tcp_probe = plugin->probe_head)) | ||
4092 | { | ||
4093 | GNUNET_CONTAINER_DLL_remove (plugin->probe_head, | ||
4094 | plugin->probe_tail, | ||
4095 | tcp_probe); | ||
4096 | GNUNET_CONNECTION_destroy (tcp_probe->sock); | ||
4097 | GNUNET_free (tcp_probe); | ||
4098 | } | ||
4099 | GNUNET_CONTAINER_multipeermap_destroy (plugin->nat_wait_conns); | ||
4100 | GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap); | ||
4101 | GNUNET_break (0 == plugin->cur_connections); | ||
4102 | GNUNET_free (plugin); | ||
4103 | GNUNET_free (api); | ||
4104 | return NULL; | ||
4105 | } | ||
4106 | |||
4107 | /* end of plugin_transport_xt.c */ | ||