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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 * @addtogroup Backbone
23 * @{
24 *
25 * @author Christian Grothoff
26 *
27 * @file
28 * Transport service plugin API
29 *
30 * @defgroup transport-plugin Transport Service plugin API
31 *
32 * Specifies the struct that is given to the plugin's entry method and the other
33 * struct that must be returned. Note that the destructors of transport plugins
34 * will be given the value returned by the constructor and is expected to return
35 * a NULL pointer.
36 *
37 * @{
38 */
39#ifndef PLUGIN_TRANSPORT_H
40#define PLUGIN_TRANSPORT_H
41
42
43#include "gnunet_configuration_lib.h"
44#include "gnunet_scheduler_lib.h"
45#include "gnunet_statistics_service.h"
46#include "gnunet_transport_service.h"
47#include "gnunet_ats_service.h"
48
49#define TRANSPORT_SESSION_INBOUND_STRING "<inbound>"
50
51/**
52 * Opaque pointer that plugins can use to distinguish specific
53 * connections to a given peer. Typically used by stateful plugins to
54 * allow the service to refer to specific streams instead of a more
55 * general notion of "some connection" to the given peer. This is
56 * useful since sometimes (e.g. for inbound TCP connections) a
57 * connection may not have an address that can be used for meaningful
58 * distinction between sessions to the same peer.
59 *
60 * Each 'struct GNUNET_ATS_Session' MUST start with the 'struct GNUNET_PeerIdentity'
61 * of the peer the session is for (which will be used for some error
62 * checking by the ATS code).
63 */
64struct GNUNET_ATS_Session;
65
66
67/**
68 * Function that will be called whenever the plugin internally
69 * cleans up a session pointer and hence the service needs to
70 * discard all of those sessions as well. Plugins that do not
71 * use sessions can simply omit calling this function and always
72 * use NULL wherever a session pointer is needed. This function
73 * should be called BEFORE a potential "TransmitContinuation"
74 * from the "TransmitFunction".
75 *
76 * @param cls closure
77 * @param peer which peer was the session for
78 * @param session which session is being destroyed
79 */
80typedef void
81(*GNUNET_TRANSPORT_SessionEnd) (void *cls,
82 const struct GNUNET_HELLO_Address *address,
83 struct GNUNET_ATS_Session *session);
84
85
86/**
87 * Plugin tells transport service about a new inbound session
88 *
89 * @param cls unused
90 * @param address the address
91 * @param session the new session
92 * @param net network information
93 */
94typedef void
95(*GNUNET_TRANSPORT_SessionStart) (void *cls,
96 const struct GNUNET_HELLO_Address *address,
97 struct GNUNET_ATS_Session *session,
98 enum GNUNET_NetworkType net);
99
100
101/**
102 * Function called by the transport for each received message.
103 * This function should also be called with "NULL" for the
104 * message to signal that the other peer disconnected.
105 *
106 * @param cls closure
107 * @param peer (claimed) identity of the other peer
108 * @param message the message, NULL if we only care about
109 * learning about the delay until we should receive again
110 * @param session identifier used for this session (NULL for plugins
111 * that do not offer bi-directional communication to the sender
112 * using the same "connection")
113 * @param sender_address binary address of the sender (if we established the
114 * connection or are otherwise sure of it; should be NULL
115 * for inbound TCP/UDP connections since it it not clear
116 * that we could establish ourselves a connection to that
117 * IP address and get the same system)
118 * @param sender_address_len number of bytes in @a sender_address
119 * @return how long the plugin should wait until receiving more data;
120 * returning #GNUNET_TIME_UNIT_FOREVER_REL means that the
121 * connection should be closed
122 */
123typedef struct GNUNET_TIME_Relative
124(*GNUNET_TRANSPORT_PluginReceiveCallback) (void *cls,
125 const struct
126 GNUNET_HELLO_Address *address,
127 struct GNUNET_ATS_Session *session,
128 const struct
129 GNUNET_MessageHeader *message);
130
131
132/**
133 * Function that can be called by plugins to figure if an address is
134 * an loopback, LAN or WAN address. Ultimately invokes
135 * #GNUNET_ATS_address_get_type().
136 *
137 * @param cls closure
138 * @param addr binary address
139 * @param addrlen length of the @a addr
140 * @return type of the network the address belongs to
141 */
142typedef enum GNUNET_NetworkType
143(*GNUNET_TRANSPORT_AddressToType)(void *cls,
144 const struct sockaddr *addr,
145 size_t addrlen);
146
147
148/**
149 * Function called when distance of an address changes.
150 *
151 * @param cls closure
152 * @param peer peer
153 * @param distance new distance
154 */
155typedef void
156(*GNUNET_TRANSPORT_UpdateAddressDistance) (void *cls,
157 const struct
158 GNUNET_HELLO_Address *address,
159 uint32_t distance);
160
161
162/**
163 * Function that will be called for each address the transport
164 * is aware that it might be reachable under.
165 *
166 * @param cls closure
167 * @param add_remove should the address added (#GNUNET_YES) or removed (#GNUNET_NO) from the
168 * set of valid addresses?
169 * @param address the address to add or remove
170 */
171typedef void
172(*GNUNET_TRANSPORT_AddressNotification) (void *cls,
173 int add_remove,
174 const struct
175 GNUNET_HELLO_Address *address);
176
177
178/**
179 * Function that will be called whenever the plugin receives data over
180 * the network and wants to determine how long it should wait until
181 * the next time it reads from the given peer. Note that some plugins
182 * (such as UDP) may not be able to wait (for a particular peer), so
183 * the waiting part is optional. Plugins that can wait should call
184 * this function, sleep the given amount of time, and call it again
185 * (with zero bytes read) UNTIL it returns zero and only then read.
186 *
187 * @param cls closure
188 * @param peer which peer did we read data from
189 * @param amount_recved number of bytes read (can be zero)
190 * @return how long to wait until reading more from this peer
191 * (to enforce inbound quotas); returning #GNUNET_TIME_UNIT_FOREVER_REL
192 * means that the connection should be closed
193 */
194typedef struct GNUNET_TIME_Relative
195(*GNUNET_TRANSPORT_TrafficReport) (void *cls,
196 const struct GNUNET_PeerIdentity *peer,
197 size_t amount_recved);
198
199
200/**
201 * Function that returns a HELLO message.
202 *
203 * @return HELLO message (FIXME with what?)
204 */
205typedef const struct GNUNET_MessageHeader *
206(*GNUNET_TRANSPORT_GetHelloCallback) (void);
207
208
209/**
210 * The transport service will pass a pointer to a struct
211 * of this type as the first and only argument to the
212 * entry point of each transport plugin.
213 */
214struct GNUNET_TRANSPORT_PluginEnvironment
215{
216 /**
217 * Configuration to use.
218 */
219 const struct GNUNET_CONFIGURATION_Handle *cfg;
220
221 /**
222 * Identity of this peer.
223 */
224 const struct GNUNET_PeerIdentity *my_identity;
225
226 /**
227 * Closure for the various callbacks.
228 */
229 void *cls;
230
231 /**
232 * Handle for reporting statistics.
233 */
234 struct GNUNET_STATISTICS_Handle *stats;
235
236 /**
237 * Function that should be called by the transport plugin
238 * whenever a message is received. If this field is "NULL",
239 * the plugin should load in 'stub' mode and NOT fully
240 * initialize and instead only return an API with the
241 * @e address_pretty_printer, @e address_to_string and
242 * @e string_to_address functions.
243 */
244 GNUNET_TRANSPORT_PluginReceiveCallback receive;
245
246 /**
247 * Function that returns our HELLO.
248 */
249 GNUNET_TRANSPORT_GetHelloCallback get_our_hello;
250
251 /**
252 * Function that must be called by each plugin to notify the
253 * transport service about the addresses under which the transport
254 * provided by the plugin can be reached.
255 */
256 GNUNET_TRANSPORT_AddressNotification notify_address;
257
258 /**
259 * Function that must be called by the plugin when a non-NULL
260 * session handle stops being valid (is destroyed).
261 */
262 GNUNET_TRANSPORT_SessionEnd session_end;
263
264 /**
265 * Function called by the plugin when a new (incoming) session was created
266 * not explicitly created using the the get_session function
267 */
268 GNUNET_TRANSPORT_SessionStart session_start;
269
270 /**
271 * Function that will be called to figure if an address is an loopback,
272 * LAN, WAN etc. address
273 */
274 GNUNET_TRANSPORT_AddressToType get_address_type;
275
276 /**
277 * Function that will be called by DV to update distance for
278 * an address.
279 */
280 GNUNET_TRANSPORT_UpdateAddressDistance update_address_distance;
281
282 /**
283 * What is the maximum number of connections that this transport
284 * should allow? Transports that do not have sessions (such as
285 * UDP) can ignore this value.
286 */
287 uint32_t max_connections;
288};
289
290
291/**
292 * Function called by the #GNUNET_TRANSPORT_TransmitFunction
293 * upon "completion". In the case that a peer disconnects,
294 * this function must be called for each pending request
295 * (with a 'failure' indication) AFTER notifying the service
296 * about the disconnect event (so that the service won't try
297 * to transmit more messages, believing the connection still
298 * exists...).
299 *
300 * @param cls closure
301 * @param target who was the recipient of the message?
302 * @param result #GNUNET_OK on success
303 * #GNUNET_SYSERR if the target disconnected;
304 * disconnect will ALSO be signalled using
305 * the ReceiveCallback.
306 * @param size_payload bytes of payload from transport service in message
307 * @param size_on_wire bytes required on wire for transmission,
308 * 0 if result == #GNUNET_SYSERR
309 */
310typedef void
311(*GNUNET_TRANSPORT_TransmitContinuation) (void *cls,
312 const struct
313 GNUNET_PeerIdentity *target,
314 int result,
315 size_t size_payload,
316 size_t size_on_wire);
317
318
319/**
320 * The new send function with just the session and no address
321 *
322 * Function that can be used by the transport service to transmit
323 * a message using the plugin. Note that in the case of a
324 * peer disconnecting, the continuation MUST be called
325 * prior to the disconnect notification itself. This function
326 * will be called with this peer's HELLO message to initiate
327 * a fresh connection to another peer.
328 *
329 * @param cls closure
330 * @param session which session must be used
331 * @param msgbuf the message to transmit
332 * @param msgbuf_size number of bytes in @a msgbuf
333 * @param priority how important is the message (most plugins will
334 * ignore message priority and just FIFO)
335 * @param to how long to wait at most for the transmission (does not
336 * require plugins to discard the message after the timeout,
337 * just advisory for the desired delay; most plugins will ignore
338 * this as well)
339 * @param cont continuation to call once the message has
340 * been transmitted (or if the transport is ready
341 * for the next transmission call; or if the
342 * peer disconnected...); can be NULL
343 * @param cont_cls closure for @a cont
344 * @return number of bytes used (on the physical network, with overheads);
345 * -1 on hard errors (i.e. address invalid); 0 is a legal value
346 * and does NOT mean that the message was not transmitted (DV)
347 */
348typedef ssize_t
349(*GNUNET_TRANSPORT_TransmitFunction) (void *cls,
350 struct GNUNET_ATS_Session *session,
351 const char *msgbuf,
352 size_t msgbuf_size,
353 unsigned int priority,
354 struct GNUNET_TIME_Relative to,
355 GNUNET_TRANSPORT_TransmitContinuation cont,
356 void *cont_cls);
357
358
359/**
360 * Function that can be called to force a disconnect from the
361 * specified neighbour for the given session only. . This should
362 * also cancel all previously scheduled transmissions for this
363 * session. Obviously the transmission may have been partially
364 * completed already, which is OK. The plugin is supposed to close
365 * the connection (if applicable).
366 *
367 * @param cls closure with the `struct Plugin`
368 * @param session session to destroy
369 * @return #GNUNET_OK on success
370 */
371typedef int
372(*GNUNET_TRANSPORT_DisconnectSessionFunction) (void *cls,
373 struct GNUNET_ATS_Session *
374 session);
375
376
377/**
378 * Function that is called to get the keepalive factor.
379 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
380 * calculate the interval between keepalive packets.
381 *
382 * @param cls closure with the `struct Plugin`
383 * @return keepalive factor
384 */
385typedef unsigned int
386(*GNUNET_TRANSPORT_QueryKeepaliveFactorFunction) (void *cls);
387
388
389/**
390 * Function that can be called to force a disconnect from the
391 * specified neighbour. This should also cancel all previously
392 * scheduled transmissions. Obviously the transmission may have been
393 * partially completed already, which is OK. The plugin is supposed
394 * to close the connection (if applicable) and no longer call the
395 * transmit continuation(s).
396 *
397 * @param cls closure
398 * @param target peer for which the last transmission is
399 * to be cancelled
400 */
401typedef void
402(*GNUNET_TRANSPORT_DisconnectPeerFunction) (void *cls,
403 const struct
404 GNUNET_PeerIdentity *target);
405
406
407/**
408 * Function called by the pretty printer for the resolved address for
409 * each human-readable address obtained. The callback can be called
410 * several times. The last invocation must be with a @a address of
411 * NULL and a @a res of #GNUNET_OK. Thus, to indicate conversion
412 * errors, the callback might be called first with @a address NULL and
413 * @a res being #GNUNET_SYSERR. In that case, there must still be a
414 * subsequent call later with @a address NULL and @a res #GNUNET_OK.
415 *
416 * @param cls closure
417 * @param address one of the names for the host, NULL on last callback
418 * @param res #GNUNET_OK if conversion was successful, #GNUNET_SYSERR on failure,
419 * #GNUNET_OK on last callback
420 */
421typedef void
422(*GNUNET_TRANSPORT_AddressStringCallback) (void *cls,
423 const char *address,
424 int res);
425
426
427/**
428 * Convert the transports address to a nice, human-readable
429 * format.
430 *
431 * @param cls closure
432 * @param type name of the transport that generated the address
433 * @param addr one of the addresses of the host, NULL for the last address
434 * the specific address format depends on the transport
435 * @param addrlen length of the @a addr
436 * @param numeric should (IP) addresses be displayed in numeric form?
437 * @param timeout after how long should we give up?
438 * @param asc function to call on each string
439 * @param asc_cls closure for @a asc
440 */
441typedef void
442(*GNUNET_TRANSPORT_AddressPrettyPrinter) (void *cls,
443 const char *type,
444 const void *addr,
445 size_t addrlen,
446 int numeric,
447 struct GNUNET_TIME_Relative timeout,
448 GNUNET_TRANSPORT_AddressStringCallback
449 asc,
450 void *asc_cls);
451
452
453/**
454 * Another peer has suggested an address for this peer and transport
455 * plugin. Check that this could be a valid address. This function
456 * is not expected to 'validate' the address in the sense of trying to
457 * connect to it but simply to see if the binary format is technically
458 * legal for establishing a connection to this peer (and make sure that
459 * the address really corresponds to our network connection/settings
460 * and not some potential man-in-the-middle).
461 *
462 * @param addr pointer to the address
463 * @param addrlen length of @a addr
464 * @return #GNUNET_OK if this is a plausible address for this peer
465 * and transport, #GNUNET_SYSERR if not
466 */
467typedef int
468(*GNUNET_TRANSPORT_CheckAddress) (void *cls,
469 const void *addr,
470 size_t addrlen);
471
472
473/**
474 * Create a new session to transmit data to the target
475 * This session will used to send data to this peer and the plugin will
476 * notify us by calling the env->session_end function
477 *
478 * @param cls the plugin
479 * @param address the hello address
480 * @return the session if the address is valid, NULL otherwise
481 */
482typedef struct GNUNET_ATS_Session *
483(*GNUNET_TRANSPORT_CreateSession) (void *cls,
484 const struct GNUNET_HELLO_Address *address);
485
486
487/**
488 * Function that will be called whenever the transport service wants to
489 * notify the plugin that a session is still active and in use and
490 * therefore the session timeout for this session has to be updated
491 *
492 * @param cls closure
493 * @param peer which peer was the session for
494 * @param session which session is being updated
495 */
496typedef void
497(*GNUNET_TRANSPORT_UpdateSessionTimeout) (void *cls,
498 const struct
499 GNUNET_PeerIdentity *peer,
500 struct GNUNET_ATS_Session *session);
501
502
503/**
504 * Function that will be called whenever the transport service wants to
505 * notify the plugin that the inbound quota changed and that the plugin
506 * should update it's delay for the next receive value
507 *
508 * @param cls closure
509 * @param peer which peer was the session for
510 * @param session which session is being updated
511 * @param delay new delay to use for receiving
512 */
513typedef void
514(*GNUNET_TRANSPORT_UpdateInboundDelay) (void *cls,
515 const struct GNUNET_PeerIdentity *peer,
516 struct GNUNET_ATS_Session *session,
517 struct GNUNET_TIME_Relative delay);
518
519
520/**
521 * Function called for a quick conversion of the binary address to
522 * a numeric address. Note that the caller must not free the
523 * address and that the next call to this function is allowed
524 * to override the address again.
525 *
526 * @param cls closure
527 * @param addr binary address
528 * @param addr_len length of the @a addr
529 * @return string representing the same address
530 */
531typedef const char *
532(*GNUNET_TRANSPORT_AddressToString) (void *cls,
533 const void *addr,
534 size_t addrlen);
535
536
537/**
538 * Function called to convert a string address to
539 * a binary address.
540 *
541 * @param cls closure (`struct Plugin*`)
542 * @param addr string address
543 * @param addrlen length of the @a addr including \0 termination
544 * @param buf location to store the buffer
545 * If the function returns #GNUNET_SYSERR, its contents are undefined.
546 * @param added length of created address
547 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
548 */
549typedef int
550(*GNUNET_TRANSPORT_StringToAddress) (void *cls,
551 const char *addr,
552 uint16_t addrlen,
553 void **buf,
554 size_t *added);
555
556
557/**
558 * Function to obtain the network type for a session
559 *
560 * @param cls closure (`struct Plugin *`)
561 * @param session the session
562 * @return the network type
563 */
564typedef enum GNUNET_NetworkType
565(*GNUNET_TRANSPORT_GetNetworkType)(void *cls,
566 struct GNUNET_ATS_Session *session);
567
568
569/**
570 * Function to obtain the network type for an address.
571 *
572 * @param cls closure (`struct Plugin *`)
573 * @param address the address
574 * @return the network type
575 */
576typedef enum GNUNET_NetworkType
577(*GNUNET_TRANSPORT_GetNetworkTypeForAddress)(void *cls,
578 const struct
579 GNUNET_HELLO_Address *address);
580
581
582/**
583 * Function called by the plugin with information about the
584 * current sessions managed by the plugin (for monitoring).
585 *
586 * @param cls closure
587 * @param session session handle this information is about,
588 * NULL to indicate that we are "in sync" (initial
589 * iteration complete)
590 * @param info information about the state of the session,
591 * NULL if @a session is also NULL and we are
592 * merely signalling that the initial iteration is over
593 */
594typedef void
595(*GNUNET_TRANSPORT_SessionInfoCallback) (void *cls,
596 struct GNUNET_ATS_Session *session,
597 const struct
598 GNUNET_TRANSPORT_SessionInfo *info);
599
600
601/**
602 * Begin monitoring sessions of a plugin. There can only
603 * be one active monitor per plugin (i.e. if there are
604 * multiple monitors, the transport service needs to
605 * multiplex the generated events over all of them).
606 *
607 * @param cls closure of the plugin
608 * @param sic callback to invoke, NULL to disable monitor;
609 * plugin will being by iterating over all active
610 * sessions immediately and then enter monitor mode
611 * @param sic_cls closure for @a sic
612 */
613typedef void
614(*GNUNET_TRANSPORT_SessionMonitorSetup) (void *cls,
615 GNUNET_TRANSPORT_SessionInfoCallback
616 sic,
617 void *sic_cls);
618
619
620/**
621 * Each plugin is required to return a pointer to a struct of this
622 * type as the return value from its entry point.
623 */
624struct GNUNET_TRANSPORT_PluginFunctions
625{
626 /**
627 * Closure for all of the callbacks.
628 */
629 void *cls;
630
631 /**
632 * Function that the transport service will use to transmit data to
633 * another peer. May be NULL for plugins that only support
634 * receiving data. After this call, the plugin call the specified
635 * continuation with success or error before notifying us about the
636 * target having disconnected.
637 */
638 GNUNET_TRANSPORT_TransmitFunction send;
639
640 /**
641 * Function that can be used to force the plugin to disconnect from
642 * the given peer and cancel all previous transmissions (and their
643 * continuations).
644 */
645 GNUNET_TRANSPORT_DisconnectPeerFunction disconnect_peer;
646
647 /**
648 * Function that can be used to force the plugin to disconnect from
649 * the given peer and cancel all previous transmissions (and their
650 * continuations).
651 */
652 GNUNET_TRANSPORT_DisconnectSessionFunction disconnect_session;
653
654 /**
655 * Function that will be called whenever the transport service wants to
656 * notify the plugin that a session is still active and in use and
657 * therefore the session timeout for this session has to be updated
658 */
659 GNUNET_TRANSPORT_UpdateSessionTimeout update_session_timeout;
660
661 /**
662 * Function that will be called whenever the transport service wants to
663 * notify the plugin that the inbound quota changed and that the plugin
664 * should update it's delay for the next receive value
665 */
666 GNUNET_TRANSPORT_UpdateInboundDelay update_inbound_delay;
667
668 /**
669 * Function that is used to query keepalive factor.
670 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
671 * calculate the interval between keepalive packets.
672 */
673 GNUNET_TRANSPORT_QueryKeepaliveFactorFunction query_keepalive_factor;
674
675 /**
676 * Function to pretty-print addresses.
677 */
678 GNUNET_TRANSPORT_AddressPrettyPrinter address_pretty_printer;
679
680 /**
681 * Function that will be called to check if a binary address
682 * for this plugin is well-formed and corresponds to an
683 * address for THIS peer (as per our configuration). Naturally,
684 * if absolutely necessary, plugins can be a bit conservative in
685 * their answer, but in general plugins should make sure that the
686 * address does not redirect traffic to a 3rd party that might
687 * try to man-in-the-middle our traffic.
688 */
689 GNUNET_TRANSPORT_CheckAddress check_address;
690
691 /**
692 * Function that will be called to convert a binary address
693 * to a string (numeric conversion only).
694 */
695 GNUNET_TRANSPORT_AddressToString address_to_string;
696
697 /**
698 * Function that will be called to convert a string address
699 * to binary (numeric conversion only).
700 */
701 GNUNET_TRANSPORT_StringToAddress string_to_address;
702
703 /**
704 * Function that will be called tell the plugin to create a session
705 * object.
706 */
707 GNUNET_TRANSPORT_CreateSession get_session;
708
709 /**
710 * Function to obtain the network type for a session
711 */
712 GNUNET_TRANSPORT_GetNetworkType get_network;
713
714 /**
715 * Function to obtain the network type for an address
716 */
717 GNUNET_TRANSPORT_GetNetworkTypeForAddress get_network_for_address;
718
719 /**
720 * Function to monitor the sessions managed by the plugin.
721 */
722 GNUNET_TRANSPORT_SessionMonitorSetup setup_monitor;
723};
724
725
726/*#ifndef PLUGIN_TRANSPORT_H*/
727#endif
728
729/** @} */ /* end of group */
730
731/** @} */ /* end of group addition */
732
733/* end of gnunet_transport_plugin.h */
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