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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 */
52struct GNUNET_CONNECTION_TransmitHandle;
53
54/**
55 * @brief handle for a server
56 */
57struct GNUNET_SERVER_Handle;
58
59/**
60 * @brief opaque handle for a client of the server
61 */
62struct GNUNET_SERVER_Client;
63
64/**
65 * @brief opaque handle server returns for aborting transmission to a client.
66 */
67struct GNUNET_SERVER_TransmitHandle;
68
69/**
70 * @brief handle for a network connection
71 */
72struct GNUNET_CONNECTION_Handle;
73
74/**
75 * @brief handle for a network service
76 */
77struct 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 */
85void
86LEGACY_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 */
100typedef size_t
101(*GNUNET_CONNECTION_TransmitReadyNotify) (void *cls,
102 size_t size,
103 void *buf);
104
105/**
106 * Credentials for UNIX domain sockets.
107 */
108struct 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 */
130typedef 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 */
142typedef 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 */
159typedef 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 */
179typedef 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 */
194void
195GNUNET_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 */
205typedef 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 */
216typedef 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 */
236typedef 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 */
251typedef 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 */
260struct 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 */
291enum 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 */
323void
324GNUNET_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 */
334void *
335GNUNET_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 */
351typedef 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 */
364struct GNUNET_SERVER_MessageStreamTokenizer *
365GNUNET_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 */
384int
385GNUNET_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 */
397void
398GNUNET_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 */
409void
410GNUNET_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 */
449struct GNUNET_SERVER_TransmitHandle *
450GNUNET_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 */
461void
462GNUNET_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 */
474void
475GNUNET_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 */
486void
487GNUNET_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 */
498typedef 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 */
511void
512GNUNET_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 */
529struct GNUNET_SERVER_TransmitHandle *
530GNUNET_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 */
548struct GNUNET_SERVER_Client *
549GNUNET_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 */
558void
559GNUNET_SERVER_resume (struct GNUNET_SERVER_Handle *server);
560
561/**
562 * Free resources held by this server.
563 *
564 * @param server server to destroy
565 */
566void
567GNUNET_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
577GNUNET_NETWORK_STRUCT_BEGIN
578
579/**
580 * Initial handshake message for a session.
581 */
582struct 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 */
600struct 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};
613GNUNET_NETWORK_STRUCT_END
614
615/**
616 * Context for sending a NAT probe via TCP.
617 */
618struct 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 */
655enum 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
674GNUNET_NETWORK_STRUCT_BEGIN
675
676/**
677 * Network format for IPv4 addresses.
678 */
679struct 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 */
702struct 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};
721GNUNET_NETWORK_STRUCT_END
722
723/**
724 * Encapsulation of all of the state of the plugin.
725 */
726struct Plugin;
727
728/**
729 * Information kept for each message that is yet to
730 * be transmitted.
731 */
732struct 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 */
779struct 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 */
883struct 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 */
940struct 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 */
1072static int
1073get_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 */
1404static void
1405notify_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 */
1439static void
1440tcp_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 */
1517static const char *
1518tcp_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 */
1585static int
1586tcp_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 */
1691static struct GNUNET_ATS_Session *
1692lookup_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 */
1709static int
1710tcp_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 */
1830static unsigned int
1831tcp_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 */
1842static void
1843session_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 */
1878static void
1879reschedule_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 */
1898static struct GNUNET_ATS_Session *
1899create_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 */
1983static void
1984process_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 */
1998static size_t
1999do_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 */
2156static void
2157process_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 */
2203static ssize_t
2204tcp_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 */
2295struct 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 */
2318static int
2319session_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 */
2340static void
2341nat_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 */
2366static void
2367tcp_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 */
2381static void
2382delayed_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 */
2403static void
2404tcp_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 */
2432static struct GNUNET_ATS_Session *
2433tcp_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 */
2708static int
2709session_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 */
2742static void
2743tcp_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 */
2772static void
2773append_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 */
2830static void
2831tcp_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 */
2930static int
2931tcp_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 */
3016static void
3017handle_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 */
3160static void
3161handle_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 */
3334static void
3335handle_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 */
3456static void
3457connect_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 */
3493static void
3494disconnect_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 */
3544static size_t
3545notify_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 */
3584static void
3585try_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 &notify_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 */
3634static enum GNUNET_NetworkType
3635tcp_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 */
3649static enum GNUNET_NetworkType
3650tcp_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 */
3711static int
3712send_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 */
3743static void
3744tcp_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 */
3769void *
3770libgnunet_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 */
4045void *
4046libgnunet_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 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-16 13:39:12 +0000