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1/*
2 This file is part of GNUnet
3 Copyright (C) 2009-2014 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
21/**
22 * @author Christian Grothoff
23 *
24 * @file
25 * Transport service plugin API
26 *
27 * @defgroup transport-plugin Transport Service plugin API
28 *
29 * Specifies the struct that is given to the plugin's entry method and the other
30 * struct that must be returned. Note that the destructors of transport plugins
31 * will be given the value returned by the constructor and is expected to return
32 * a NULL pointer.
33 *
34 * @{
35 */
36#ifndef PLUGIN_TRANSPORT_H
37#define PLUGIN_TRANSPORT_H
38
39#include "gnunet_configuration_lib.h"
40#include "gnunet_scheduler_lib.h"
41#include "gnunet_statistics_service.h"
42#include "gnunet_transport_service.h"
43#include "gnunet_ats_service.h"
44
45#define TRANSPORT_SESSION_INBOUND_STRING "<inbound>"
46
47/**
48 * Opaque pointer that plugins can use to distinguish specific
49 * connections to a given peer. Typically used by stateful plugins to
50 * allow the service to refer to specific streams instead of a more
51 * general notion of "some connection" to the given peer. This is
52 * useful since sometimes (e.g. for inbound TCP connections) a
53 * connection may not have an address that can be used for meaningful
54 * distinction between sessions to the same peer.
55 *
56 * Each 'struct GNUNET_ATS_Session' MUST start with the 'struct GNUNET_PeerIdentity'
57 * of the peer the session is for (which will be used for some error
58 * checking by the ATS code).
59 */
60struct GNUNET_ATS_Session;
61
62
63/**
64 * Function that will be called whenever the plugin internally
65 * cleans up a session pointer and hence the service needs to
66 * discard all of those sessions as well. Plugins that do not
67 * use sessions can simply omit calling this function and always
68 * use NULL wherever a session pointer is needed. This function
69 * should be called BEFORE a potential "TransmitContinuation"
70 * from the "TransmitFunction".
71 *
72 * @param cls closure
73 * @param peer which peer was the session for
74 * @param session which session is being destroyed
75 */
76typedef void
77(*GNUNET_TRANSPORT_SessionEnd) (void *cls,
78 const struct GNUNET_HELLO_Address *address,
79 struct GNUNET_ATS_Session *session);
80
81
82/**
83 * Plugin tells transport service about a new inbound session
84 *
85 * @param cls unused
86 * @param address the address
87 * @param session the new session
88 * @param net network information
89 */
90typedef void
91(*GNUNET_TRANSPORT_SessionStart) (void *cls,
92 const struct GNUNET_HELLO_Address *address,
93 struct GNUNET_ATS_Session *session,
94 enum GNUNET_NetworkType net);
95
96
97/**
98 * Function called by the transport for each received message.
99 * This function should also be called with "NULL" for the
100 * message to signal that the other peer disconnected.
101 *
102 * @param cls closure
103 * @param peer (claimed) identity of the other peer
104 * @param message the message, NULL if we only care about
105 * learning about the delay until we should receive again
106 * @param session identifier used for this session (NULL for plugins
107 * that do not offer bi-directional communication to the sender
108 * using the same "connection")
109 * @param sender_address binary address of the sender (if we established the
110 * connection or are otherwise sure of it; should be NULL
111 * for inbound TCP/UDP connections since it it not clear
112 * that we could establish ourselves a connection to that
113 * IP address and get the same system)
114 * @param sender_address_len number of bytes in @a sender_address
115 * @return how long the plugin should wait until receiving more data;
116 * returning #GNUNET_TIME_UNIT_FOREVER_REL means that the
117 * connection should be closed
118 */
119typedef struct GNUNET_TIME_Relative
120(*GNUNET_TRANSPORT_PluginReceiveCallback) (void *cls,
121 const struct
122 GNUNET_HELLO_Address *address,
123 struct GNUNET_ATS_Session *session,
124 const struct
125 GNUNET_MessageHeader *message);
126
127
128/**
129 * Function that can be called by plugins to figure if an address is
130 * an loopback, LAN or WAN address. Ultimately invokes
131 * #GNUNET_ATS_address_get_type().
132 *
133 * @param cls closure
134 * @param addr binary address
135 * @param addrlen length of the @a addr
136 * @return type of the network the address belongs to
137 */
138typedef enum GNUNET_NetworkType
139(*GNUNET_TRANSPORT_AddressToType)(void *cls,
140 const struct sockaddr *addr,
141 size_t addrlen);
142
143
144/**
145 * Function called when distance of an address changes.
146 *
147 * @param cls closure
148 * @param peer peer
149 * @param distance new distance
150 */
151typedef void
152(*GNUNET_TRANSPORT_UpdateAddressDistance) (void *cls,
153 const struct
154 GNUNET_HELLO_Address *address,
155 uint32_t distance);
156
157
158/**
159 * Function that will be called for each address the transport
160 * is aware that it might be reachable under.
161 *
162 * @param cls closure
163 * @param add_remove should the address added (#GNUNET_YES) or removed (#GNUNET_NO) from the
164 * set of valid addresses?
165 * @param address the address to add or remove
166 */
167typedef void
168(*GNUNET_TRANSPORT_AddressNotification) (void *cls,
169 int add_remove,
170 const struct
171 GNUNET_HELLO_Address *address);
172
173
174/**
175 * Function that will be called whenever the plugin receives data over
176 * the network and wants to determine how long it should wait until
177 * the next time it reads from the given peer. Note that some plugins
178 * (such as UDP) may not be able to wait (for a particular peer), so
179 * the waiting part is optional. Plugins that can wait should call
180 * this function, sleep the given amount of time, and call it again
181 * (with zero bytes read) UNTIL it returns zero and only then read.
182 *
183 * @param cls closure
184 * @param peer which peer did we read data from
185 * @param amount_recved number of bytes read (can be zero)
186 * @return how long to wait until reading more from this peer
187 * (to enforce inbound quotas); returning #GNUNET_TIME_UNIT_FOREVER_REL
188 * means that the connection should be closed
189 */
190typedef struct GNUNET_TIME_Relative
191(*GNUNET_TRANSPORT_TrafficReport) (void *cls,
192 const struct GNUNET_PeerIdentity *peer,
193 size_t amount_recved);
194
195
196/**
197 * Function that returns a HELLO message.
198 *
199 * @return HELLO message (FIXME with what?)
200 */
201typedef const struct GNUNET_MessageHeader *
202(*GNUNET_TRANSPORT_GetHelloCallback) (void);
203
204
205/**
206 * The transport service will pass a pointer to a struct
207 * of this type as the first and only argument to the
208 * entry point of each transport plugin.
209 */
210struct GNUNET_TRANSPORT_PluginEnvironment
211{
212 /**
213 * Configuration to use.
214 */
215 const struct GNUNET_CONFIGURATION_Handle *cfg;
216
217 /**
218 * Identity of this peer.
219 */
220 const struct GNUNET_PeerIdentity *my_identity;
221
222 /**
223 * Closure for the various callbacks.
224 */
225 void *cls;
226
227 /**
228 * Handle for reporting statistics.
229 */
230 struct GNUNET_STATISTICS_Handle *stats;
231
232 /**
233 * Function that should be called by the transport plugin
234 * whenever a message is received. If this field is "NULL",
235 * the plugin should load in 'stub' mode and NOT fully
236 * initialize and instead only return an API with the
237 * @e address_pretty_printer, @e address_to_string and
238 * @e string_to_address functions.
239 */
240 GNUNET_TRANSPORT_PluginReceiveCallback receive;
241
242 /**
243 * Function that returns our HELLO.
244 */
245 GNUNET_TRANSPORT_GetHelloCallback get_our_hello;
246
247 /**
248 * Function that must be called by each plugin to notify the
249 * transport service about the addresses under which the transport
250 * provided by the plugin can be reached.
251 */
252 GNUNET_TRANSPORT_AddressNotification notify_address;
253
254 /**
255 * Function that must be called by the plugin when a non-NULL
256 * session handle stops being valid (is destroyed).
257 */
258 GNUNET_TRANSPORT_SessionEnd session_end;
259
260 /**
261 * Function called by the plugin when a new (incoming) session was created
262 * not explicitly created using the the get_session function
263 */
264 GNUNET_TRANSPORT_SessionStart session_start;
265
266 /**
267 * Function that will be called to figure if an address is an loopback,
268 * LAN, WAN etc. address
269 */
270 GNUNET_TRANSPORT_AddressToType get_address_type;
271
272 /**
273 * Function that will be called by DV to update distance for
274 * an address.
275 */
276 GNUNET_TRANSPORT_UpdateAddressDistance update_address_distance;
277
278 /**
279 * What is the maximum number of connections that this transport
280 * should allow? Transports that do not have sessions (such as
281 * UDP) can ignore this value.
282 */
283 uint32_t max_connections;
284};
285
286
287/**
288 * Function called by the #GNUNET_TRANSPORT_TransmitFunction
289 * upon "completion". In the case that a peer disconnects,
290 * this function must be called for each pending request
291 * (with a 'failure' indication) AFTER notifying the service
292 * about the disconnect event (so that the service won't try
293 * to transmit more messages, believing the connection still
294 * exists...).
295 *
296 * @param cls closure
297 * @param target who was the recipient of the message?
298 * @param result #GNUNET_OK on success
299 * #GNUNET_SYSERR if the target disconnected;
300 * disconnect will ALSO be signalled using
301 * the ReceiveCallback.
302 * @param size_payload bytes of payload from transport service in message
303 * @param size_on_wire bytes required on wire for transmission,
304 * 0 if result == #GNUNET_SYSERR
305 */
306typedef void
307(*GNUNET_TRANSPORT_TransmitContinuation) (void *cls,
308 const struct
309 GNUNET_PeerIdentity *target,
310 int result,
311 size_t size_payload,
312 size_t size_on_wire);
313
314
315/**
316 * The new send function with just the session and no address
317 *
318 * Function that can be used by the transport service to transmit
319 * a message using the plugin. Note that in the case of a
320 * peer disconnecting, the continuation MUST be called
321 * prior to the disconnect notification itself. This function
322 * will be called with this peer's HELLO message to initiate
323 * a fresh connection to another peer.
324 *
325 * @param cls closure
326 * @param session which session must be used
327 * @param msgbuf the message to transmit
328 * @param msgbuf_size number of bytes in @a msgbuf
329 * @param priority how important is the message (most plugins will
330 * ignore message priority and just FIFO)
331 * @param to how long to wait at most for the transmission (does not
332 * require plugins to discard the message after the timeout,
333 * just advisory for the desired delay; most plugins will ignore
334 * this as well)
335 * @param cont continuation to call once the message has
336 * been transmitted (or if the transport is ready
337 * for the next transmission call; or if the
338 * peer disconnected...); can be NULL
339 * @param cont_cls closure for @a cont
340 * @return number of bytes used (on the physical network, with overheads);
341 * -1 on hard errors (i.e. address invalid); 0 is a legal value
342 * and does NOT mean that the message was not transmitted (DV)
343 */
344typedef ssize_t
345(*GNUNET_TRANSPORT_TransmitFunction) (void *cls,
346 struct GNUNET_ATS_Session *session,
347 const char *msgbuf,
348 size_t msgbuf_size,
349 unsigned int priority,
350 struct GNUNET_TIME_Relative to,
351 GNUNET_TRANSPORT_TransmitContinuation cont,
352 void *cont_cls);
353
354
355/**
356 * Function that can be called to force a disconnect from the
357 * specified neighbour for the given session only. . This should
358 * also cancel all previously scheduled transmissions for this
359 * session. Obviously the transmission may have been partially
360 * completed already, which is OK. The plugin is supposed to close
361 * the connection (if applicable).
362 *
363 * @param cls closure with the `struct Plugin`
364 * @param session session to destroy
365 * @return #GNUNET_OK on success
366 */
367typedef int
368(*GNUNET_TRANSPORT_DisconnectSessionFunction) (void *cls,
369 struct GNUNET_ATS_Session *
370 session);
371
372
373/**
374 * Function that is called to get the keepalive factor.
375 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
376 * calculate the interval between keepalive packets.
377 *
378 * @param cls closure with the `struct Plugin`
379 * @return keepalive factor
380 */
381typedef unsigned int
382(*GNUNET_TRANSPORT_QueryKeepaliveFactorFunction) (void *cls);
383
384
385/**
386 * Function that can be called to force a disconnect from the
387 * specified neighbour. This should also cancel all previously
388 * scheduled transmissions. Obviously the transmission may have been
389 * partially completed already, which is OK. The plugin is supposed
390 * to close the connection (if applicable) and no longer call the
391 * transmit continuation(s).
392 *
393 * @param cls closure
394 * @param target peer for which the last transmission is
395 * to be cancelled
396 */
397typedef void
398(*GNUNET_TRANSPORT_DisconnectPeerFunction) (void *cls,
399 const struct
400 GNUNET_PeerIdentity *target);
401
402
403/**
404 * Function called by the pretty printer for the resolved address for
405 * each human-readable address obtained. The callback can be called
406 * several times. The last invocation must be with a @a address of
407 * NULL and a @a res of #GNUNET_OK. Thus, to indicate conversion
408 * errors, the callback might be called first with @a address NULL and
409 * @a res being #GNUNET_SYSERR. In that case, there must still be a
410 * subsequent call later with @a address NULL and @a res #GNUNET_OK.
411 *
412 * @param cls closure
413 * @param address one of the names for the host, NULL on last callback
414 * @param res #GNUNET_OK if conversion was successful, #GNUNET_SYSERR on failure,
415 * #GNUNET_OK on last callback
416 */
417typedef void
418(*GNUNET_TRANSPORT_AddressStringCallback) (void *cls,
419 const char *address,
420 int res);
421
422
423/**
424 * Convert the transports address to a nice, human-readable
425 * format.
426 *
427 * @param cls closure
428 * @param type name of the transport that generated the address
429 * @param addr one of the addresses of the host, NULL for the last address
430 * the specific address format depends on the transport
431 * @param addrlen length of the @a addr
432 * @param numeric should (IP) addresses be displayed in numeric form?
433 * @param timeout after how long should we give up?
434 * @param asc function to call on each string
435 * @param asc_cls closure for @a asc
436 */
437typedef void
438(*GNUNET_TRANSPORT_AddressPrettyPrinter) (void *cls,
439 const char *type,
440 const void *addr,
441 size_t addrlen,
442 int numeric,
443 struct GNUNET_TIME_Relative timeout,
444 GNUNET_TRANSPORT_AddressStringCallback
445 asc,
446 void *asc_cls);
447
448
449/**
450 * Another peer has suggested an address for this peer and transport
451 * plugin. Check that this could be a valid address. This function
452 * is not expected to 'validate' the address in the sense of trying to
453 * connect to it but simply to see if the binary format is technically
454 * legal for establishing a connection to this peer (and make sure that
455 * the address really corresponds to our network connection/settings
456 * and not some potential man-in-the-middle).
457 *
458 * @param addr pointer to the address
459 * @param addrlen length of @a addr
460 * @return #GNUNET_OK if this is a plausible address for this peer
461 * and transport, #GNUNET_SYSERR if not
462 */
463typedef int
464(*GNUNET_TRANSPORT_CheckAddress) (void *cls,
465 const void *addr,
466 size_t addrlen);
467
468
469/**
470 * Create a new session to transmit data to the target
471 * This session will used to send data to this peer and the plugin will
472 * notify us by calling the env->session_end function
473 *
474 * @param cls the plugin
475 * @param address the hello address
476 * @return the session if the address is valid, NULL otherwise
477 */
478typedef struct GNUNET_ATS_Session *
479(*GNUNET_TRANSPORT_CreateSession) (void *cls,
480 const struct GNUNET_HELLO_Address *address);
481
482
483/**
484 * Function that will be called whenever the transport service wants to
485 * notify the plugin that a session is still active and in use and
486 * therefore the session timeout for this session has to be updated
487 *
488 * @param cls closure
489 * @param peer which peer was the session for
490 * @param session which session is being updated
491 */
492typedef void
493(*GNUNET_TRANSPORT_UpdateSessionTimeout) (void *cls,
494 const struct
495 GNUNET_PeerIdentity *peer,
496 struct GNUNET_ATS_Session *session);
497
498
499/**
500 * Function that will be called whenever the transport service wants to
501 * notify the plugin that the inbound quota changed and that the plugin
502 * should update it's delay for the next receive value
503 *
504 * @param cls closure
505 * @param peer which peer was the session for
506 * @param session which session is being updated
507 * @param delay new delay to use for receiving
508 */
509typedef void
510(*GNUNET_TRANSPORT_UpdateInboundDelay) (void *cls,
511 const struct GNUNET_PeerIdentity *peer,
512 struct GNUNET_ATS_Session *session,
513 struct GNUNET_TIME_Relative delay);
514
515
516/**
517 * Function called for a quick conversion of the binary address to
518 * a numeric address. Note that the caller must not free the
519 * address and that the next call to this function is allowed
520 * to override the address again.
521 *
522 * @param cls closure
523 * @param addr binary address
524 * @param addr_len length of the @a addr
525 * @return string representing the same address
526 */
527typedef const char *
528(*GNUNET_TRANSPORT_AddressToString) (void *cls,
529 const void *addr,
530 size_t addrlen);
531
532
533/**
534 * Function called to convert a string address to
535 * a binary address.
536 *
537 * @param cls closure (`struct Plugin*`)
538 * @param addr string address
539 * @param addrlen length of the @a addr including \0 termination
540 * @param buf location to store the buffer
541 * If the function returns #GNUNET_SYSERR, its contents are undefined.
542 * @param added length of created address
543 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
544 */
545typedef int
546(*GNUNET_TRANSPORT_StringToAddress) (void *cls,
547 const char *addr,
548 uint16_t addrlen,
549 void **buf,
550 size_t *added);
551
552
553/**
554 * Function to obtain the network type for a session
555 *
556 * @param cls closure (`struct Plugin *`)
557 * @param session the session
558 * @return the network type
559 */
560typedef enum GNUNET_NetworkType
561(*GNUNET_TRANSPORT_GetNetworkType)(void *cls,
562 struct GNUNET_ATS_Session *session);
563
564
565/**
566 * Function to obtain the network type for an address.
567 *
568 * @param cls closure (`struct Plugin *`)
569 * @param address the address
570 * @return the network type
571 */
572typedef enum GNUNET_NetworkType
573(*GNUNET_TRANSPORT_GetNetworkTypeForAddress)(void *cls,
574 const struct
575 GNUNET_HELLO_Address *address);
576
577
578/**
579 * Function called by the plugin with information about the
580 * current sessions managed by the plugin (for monitoring).
581 *
582 * @param cls closure
583 * @param session session handle this information is about,
584 * NULL to indicate that we are "in sync" (initial
585 * iteration complete)
586 * @param info information about the state of the session,
587 * NULL if @a session is also NULL and we are
588 * merely signalling that the initial iteration is over
589 */
590typedef void
591(*GNUNET_TRANSPORT_SessionInfoCallback) (void *cls,
592 struct GNUNET_ATS_Session *session,
593 const struct
594 GNUNET_TRANSPORT_SessionInfo *info);
595
596
597/**
598 * Begin monitoring sessions of a plugin. There can only
599 * be one active monitor per plugin (i.e. if there are
600 * multiple monitors, the transport service needs to
601 * multiplex the generated events over all of them).
602 *
603 * @param cls closure of the plugin
604 * @param sic callback to invoke, NULL to disable monitor;
605 * plugin will being by iterating over all active
606 * sessions immediately and then enter monitor mode
607 * @param sic_cls closure for @a sic
608 */
609typedef void
610(*GNUNET_TRANSPORT_SessionMonitorSetup) (void *cls,
611 GNUNET_TRANSPORT_SessionInfoCallback
612 sic,
613 void *sic_cls);
614
615
616/**
617 * Each plugin is required to return a pointer to a struct of this
618 * type as the return value from its entry point.
619 */
620struct GNUNET_TRANSPORT_PluginFunctions
621{
622 /**
623 * Closure for all of the callbacks.
624 */
625 void *cls;
626
627 /**
628 * Function that the transport service will use to transmit data to
629 * another peer. May be NULL for plugins that only support
630 * receiving data. After this call, the plugin call the specified
631 * continuation with success or error before notifying us about the
632 * target having disconnected.
633 */
634 GNUNET_TRANSPORT_TransmitFunction send;
635
636 /**
637 * Function that can be used to force the plugin to disconnect from
638 * the given peer and cancel all previous transmissions (and their
639 * continuations).
640 */
641 GNUNET_TRANSPORT_DisconnectPeerFunction disconnect_peer;
642
643 /**
644 * Function that can be used to force the plugin to disconnect from
645 * the given peer and cancel all previous transmissions (and their
646 * continuations).
647 */
648 GNUNET_TRANSPORT_DisconnectSessionFunction disconnect_session;
649
650 /**
651 * Function that will be called whenever the transport service wants to
652 * notify the plugin that a session is still active and in use and
653 * therefore the session timeout for this session has to be updated
654 */
655 GNUNET_TRANSPORT_UpdateSessionTimeout update_session_timeout;
656
657 /**
658 * Function that will be called whenever the transport service wants to
659 * notify the plugin that the inbound quota changed and that the plugin
660 * should update it's delay for the next receive value
661 */
662 GNUNET_TRANSPORT_UpdateInboundDelay update_inbound_delay;
663
664 /**
665 * Function that is used to query keepalive factor.
666 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
667 * calculate the interval between keepalive packets.
668 */
669 GNUNET_TRANSPORT_QueryKeepaliveFactorFunction query_keepalive_factor;
670
671 /**
672 * Function to pretty-print addresses.
673 */
674 GNUNET_TRANSPORT_AddressPrettyPrinter address_pretty_printer;
675
676 /**
677 * Function that will be called to check if a binary address
678 * for this plugin is well-formed and corresponds to an
679 * address for THIS peer (as per our configuration). Naturally,
680 * if absolutely necessary, plugins can be a bit conservative in
681 * their answer, but in general plugins should make sure that the
682 * address does not redirect traffic to a 3rd party that might
683 * try to man-in-the-middle our traffic.
684 */
685 GNUNET_TRANSPORT_CheckAddress check_address;
686
687 /**
688 * Function that will be called to convert a binary address
689 * to a string (numeric conversion only).
690 */
691 GNUNET_TRANSPORT_AddressToString address_to_string;
692
693 /**
694 * Function that will be called to convert a string address
695 * to binary (numeric conversion only).
696 */
697 GNUNET_TRANSPORT_StringToAddress string_to_address;
698
699 /**
700 * Function that will be called tell the plugin to create a session
701 * object.
702 */
703 GNUNET_TRANSPORT_CreateSession get_session;
704
705 /**
706 * Function to obtain the network type for a session
707 */
708 GNUNET_TRANSPORT_GetNetworkType get_network;
709
710 /**
711 * Function to obtain the network type for an address
712 */
713 GNUNET_TRANSPORT_GetNetworkTypeForAddress get_network_for_address;
714
715 /**
716 * Function to monitor the sessions managed by the plugin.
717 */
718 GNUNET_TRANSPORT_SessionMonitorSetup setup_monitor;
719};
720
721
722/*#ifndef PLUGIN_TRANSPORT_H*/
723#endif
724
725/** @} */ /* end of group */
726
727/* end of gnunet_transport_plugin.h */
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