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diff --git a/src/transport/plugin_transport_bluetooth.c b/src/transport/plugin_transport_bluetooth.c
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1/*
2 This file is part of GNUnet
3 (C) 2010, 2011, 2012 Christian Grothoff (and other contributing authors)
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
19*/
20
21/**
22 * @file transport/plugin_transport_bluetooth.c
23 * @brief transport plugin for bluetooth
24 * @author David Brodski
25 * @author Christian Grothoff
26 *
27 * THIS IS A COPY OF plugin_transport_wlan.c
28 */
29#include "platform.h"
30#include "gnunet_hello_lib.h"
31#include "gnunet_protocols.h"
32#include "gnunet_util_lib.h"
33#include "gnunet_statistics_service.h"
34#include "gnunet_transport_service.h"
35#include "gnunet_transport_plugin.h"
36#include "plugin_transport_wlan.h"
37#include "gnunet_common.h"
38#include "gnunet_crypto_lib.h"
39#include "gnunet_fragmentation_lib.h"
40#include "gnunet_constants.h"
41
42#define LOG(kind,...) GNUNET_log_from (kind, "transport-bluetooth",__VA_ARGS__)
43
44#define PLUGIN_NAME "bluetooth"
45
46/**
47 * Max size of packet (that we give to the WLAN driver for transmission)
48 */
49#define WLAN_MTU 1430
50
51/**
52 * time out of a mac endpoint
53 */
54#define MACENDPOINT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2)
55
56/**
57 * We reduce the frequence of HELLO beacons in relation to
58 * the number of MAC addresses currently visible to us.
59 * This is the multiplication factor.
60 */
61#define HELLO_BEACON_SCALING_FACTOR GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 2)
62
63/**
64 * Maximum number of messages in defragmentation queue per MAC
65 */
66#define MESSAGES_IN_DEFRAG_QUEUE_PER_MAC 2
67
68/**
69 * Link layer control fields for better compatibility
70 * (i.e. GNUnet over WLAN is not IP-over-WLAN).
71 */
72#define WLAN_LLC_DSAP_FIELD 0x1f
73#define WLAN_LLC_SSAP_FIELD 0x1f
74
75
76GNUNET_NETWORK_STRUCT_BEGIN
77/**
78 * Header for messages which need fragmentation. This is the format of
79 * a message we obtain AFTER defragmentation. We then need to check
80 * the CRC and then tokenize the payload and pass it to the
81 * 'receive' callback.
82 */
83struct WlanHeader
84{
85
86 /**
87 * Message type is GNUNET_MESSAGE_TYPE_WLAN_DATA.
88 */
89 struct GNUNET_MessageHeader header;
90
91 /**
92 * CRC32 checksum (only over the payload), in NBO.
93 */
94 uint32_t crc GNUNET_PACKED;
95
96 /**
97 * Sender of the message.
98 */
99 struct GNUNET_PeerIdentity sender;
100
101 /**
102 * Target of the message.
103 */
104 struct GNUNET_PeerIdentity target;
105
106 /* followed by payload, possibly including
107 multiple messages! */
108
109};
110
111
112struct WlanAddress
113{
114 uint32_t options GNUNET_PACKED;
115
116 struct GNUNET_TRANSPORT_WLAN_MacAddress mac;
117};
118
119
120GNUNET_NETWORK_STRUCT_END
121
122
123/**
124 * Information kept for each message that is yet to be fragmented and
125 * transmitted.
126 */
127struct PendingMessage
128{
129 /**
130 * next entry in the DLL
131 */
132 struct PendingMessage *next;
133
134 /**
135 * previous entry in the DLL
136 */
137 struct PendingMessage *prev;
138
139 /**
140 * The pending message
141 */
142 struct WlanHeader *msg;
143
144 /**
145 * Continuation function to call once the message
146 * has been sent. Can be NULL if there is no
147 * continuation to call.
148 */
149 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
150
151 /**
152 * Cls for transmit_cont
153 */
154 void *transmit_cont_cls;
155
156 /**
157 * Timeout task (for this message).
158 */
159 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
160
161};
162
163
164/**
165 * Session handle for connections with other peers.
166 */
167struct Session
168{
169 /**
170 * To whom are we talking to (set to our identity
171 * if we are still waiting for the welcome message)
172 */
173 struct GNUNET_PeerIdentity target;
174
175 /**
176 * API requirement (must be first).
177 */
178 struct SessionHeader header;
179
180 /**
181 * We keep all sessions in a DLL at their respective
182 * 'struct MACEndpoint'.
183 */
184 struct Session *next;
185
186 /**
187 * We keep all sessions in a DLL at their respective
188 * 'struct MACEndpoint'.
189 */
190 struct Session *prev;
191
192 /**
193 * MAC endpoint with the address of this peer.
194 */
195 struct MacEndpoint *mac;
196
197 /**
198 * Head of messages currently pending for transmission to this peer.
199 */
200 struct PendingMessage *pending_message_head;
201
202 /**
203 * Tail of messages currently pending for transmission to this peer.
204 */
205 struct PendingMessage *pending_message_tail;
206
207 /**
208 * When should this session time out?
209 */
210 struct GNUNET_TIME_Absolute timeout;
211
212 /**
213 * Timeout task (for the session).
214 */
215 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
216
217};
218
219
220/**
221 * Struct for messages that are being fragmented in a MAC's transmission queue.
222 */
223struct FragmentMessage
224{
225
226 /**
227 * This is a doubly-linked list.
228 */
229 struct FragmentMessage *next;
230
231 /**
232 * This is a doubly-linked list.
233 */
234 struct FragmentMessage *prev;
235
236 /**
237 * MAC endpoint this message belongs to
238 */
239 struct MacEndpoint *macendpoint;
240
241 /**
242 * Fragmentation context
243 */
244 struct GNUNET_FRAGMENT_Context *fragcontext;
245
246 /**
247 * Transmission handle to helper (to cancel if the frag context
248 * is destroyed early for some reason).
249 */
250 struct GNUNET_HELPER_SendHandle *sh;
251
252 /**
253 * Intended recipient.
254 */
255 struct GNUNET_PeerIdentity target;
256
257 /**
258 * Timeout value for the message.
259 */
260 struct GNUNET_TIME_Absolute timeout;
261
262 /**
263 * Timeout task.
264 */
265 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
266
267 /**
268 * Continuation to call when we're done with this message.
269 */
270 GNUNET_TRANSPORT_TransmitContinuation cont;
271
272 /**
273 * Closure for 'cont'
274 */
275 void *cont_cls;
276
277 /**
278 * Size of original message
279 */
280 size_t size_payload;
281
282 /**
283 * Number of bytes used to transmit message
284 */
285 size_t size_on_wire;
286
287};
288
289
290/**
291 * Struct to represent one network card connection
292 */
293struct MacEndpoint
294{
295
296 /**
297 * We keep all MACs in a DLL in the plugin.
298 */
299 struct MacEndpoint *next;
300
301 /**
302 * We keep all MACs in a DLL in the plugin.
303 */
304 struct MacEndpoint *prev;
305
306 /**
307 * Pointer to the global plugin struct.
308 */
309 struct Plugin *plugin;
310
311 /**
312 * Head of sessions that use this MAC.
313 */
314 struct Session *sessions_head;
315
316 /**
317 * Tail of sessions that use this MAC.
318 */
319 struct Session *sessions_tail;
320
321 /**
322 * Head of messages we are currently sending to this MAC.
323 */
324 struct FragmentMessage *sending_messages_head;
325
326 /**
327 * Tail of messages we are currently sending to this MAC.
328 */
329 struct FragmentMessage *sending_messages_tail;
330
331 /**
332 * Defrag context for this MAC
333 */
334 struct GNUNET_DEFRAGMENT_Context *defrag;
335
336 /**
337 * When should this endpoint time out?
338 */
339 struct GNUNET_TIME_Absolute timeout;
340
341 /**
342 * Timeout task.
343 */
344 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
345
346 /**
347 * count of messages in the fragment out queue for this mac endpoint
348 */
349 unsigned int fragment_messages_out_count;
350
351 /**
352 * peer mac address
353 */
354 struct WlanAddress addr;
355
356 /**
357 * Message delay for fragmentation context
358 */
359 struct GNUNET_TIME_Relative msg_delay;
360
361 /**
362 * ACK delay for fragmentation context
363 */
364 struct GNUNET_TIME_Relative ack_delay;
365
366 /**
367 * Desired transmission power for this MAC
368 */
369 uint16_t tx_power;
370
371 /**
372 * Desired transmission rate for this MAC
373 */
374 uint8_t rate;
375
376 /**
377 * Antenna we should use for this MAC
378 */
379 uint8_t antenna;
380
381};
382
383
384/**
385 * Encapsulation of all of the state of the plugin.
386 */
387struct Plugin
388{
389 /**
390 * Our environment.
391 */
392 struct GNUNET_TRANSPORT_PluginEnvironment *env;
393
394 /**
395 * Handle to helper process for priviledged operations.
396 */
397 struct GNUNET_HELPER_Handle *suid_helper;
398
399 /**
400 * ARGV-vector for the helper (all helpers take only the binary
401 * name, one actual argument, plus the NULL terminator for 'argv').
402 */
403 char * helper_argv[3];
404
405 /**
406 * The interface of the wlan card given to us by the user.
407 */
408 char *interface;
409
410 /**
411 * Tokenizer for demultiplexing of data packets resulting from defragmentation.
412 */
413 struct GNUNET_SERVER_MessageStreamTokenizer *fragment_data_tokenizer;
414
415 /**
416 * Tokenizer for demultiplexing of data packets received from the suid helper
417 */
418 struct GNUNET_SERVER_MessageStreamTokenizer *helper_payload_tokenizer;
419
420 /**
421 * Tokenizer for demultiplexing of data packets that follow the WLAN Header
422 */
423 struct GNUNET_SERVER_MessageStreamTokenizer *wlan_header_payload_tokenizer;
424
425 /**
426 * Head of list of open connections.
427 */
428 struct MacEndpoint *mac_head;
429
430 /**
431 * Tail of list of open connections.
432 */
433 struct MacEndpoint *mac_tail;
434
435 /**
436 * Number of connections
437 */
438 unsigned int mac_count;
439
440 /**
441 * Task that periodically sends a HELLO beacon via the helper.
442 */
443 GNUNET_SCHEDULER_TaskIdentifier beacon_task;
444
445 /**
446 * Tracker for bandwidth limit
447 */
448 struct GNUNET_BANDWIDTH_Tracker tracker;
449
450 /**
451 * The mac_address of the wlan card given to us by the helper.
452 */
453 struct GNUNET_TRANSPORT_WLAN_MacAddress mac_address;
454
455 /**
456 * Have we received a control message with our MAC address yet?
457 */
458 int have_mac;
459
460 /**
461 * Options for addresses
462 */
463 uint32_t options;
464
465};
466
467
468/**
469 * Information associated with a message. Can contain
470 * the session or the MAC endpoint associated with the
471 * message (or both).
472 */
473struct MacAndSession
474{
475 /**
476 * NULL if the identity of the other peer is not known.
477 */
478 struct Session *session;
479
480 /**
481 * MAC address of the other peer, NULL if not known.
482 */
483 struct MacEndpoint *endpoint;
484};
485
486/**
487 * Function called for a quick conversion of the binary address to
488 * a numeric address. Note that the caller must not free the
489 * address and that the next call to this function is allowed
490 * to override the address again.
491 *
492 * @param cls closure
493 * @param addr binary address
494 * @param addrlen length of the address
495 * @return string representing the same address
496 */
497static const char *
498bluetooth_plugin_address_to_string (void *cls, const void *addr, size_t addrlen);
499
500/**
501 * Print MAC addresses nicely.
502 *
503 * @param mac the mac address
504 * @return string to a static buffer with the human-readable mac, will be overwritten during the next call to this function
505 */
506static const char *
507mac_to_string (const struct GNUNET_TRANSPORT_WLAN_MacAddress * mac)
508{
509 static char macstr[20];
510
511 GNUNET_snprintf (macstr, sizeof (macstr), "%.2X:%.2X:%.2X:%.2X:%.2X:%.2X",
512 mac->mac[0], mac->mac[1],
513 mac->mac[2], mac->mac[3], mac->mac[4], mac->mac[5]);
514 return macstr;
515}
516
517
518/**
519 * Fill the radiotap header
520 *
521 * @param endpoint pointer to the endpoint, can be NULL
522 * @param header pointer to the radiotap header
523 * @param size total message size
524 */
525static void
526get_radiotap_header (struct MacEndpoint *endpoint,
527 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *header,
528 uint16_t size)
529{
530 header->header.type = ntohs (GNUNET_MESSAGE_TYPE_WLAN_DATA_TO_HELPER);
531 header->header.size = ntohs (size);
532 if (NULL != endpoint)
533 {
534 header->rate = endpoint->rate;
535 header->tx_power = endpoint->tx_power;
536 header->antenna = endpoint->antenna;
537 }
538 else
539 {
540 header->rate = 255;
541 header->tx_power = 0;
542 header->antenna = 0;
543 }
544}
545
546
547/**
548 * Generate the WLAN hardware header for one packet
549 *
550 * @param plugin the plugin handle
551 * @param header address to write the header to
552 * @param to_mac_addr address of the recipient
553 * @param size size of the whole packet, needed to calculate the time to send the packet
554 */
555static void
556get_wlan_header (struct Plugin *plugin,
557 struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame *header,
558 const struct GNUNET_TRANSPORT_WLAN_MacAddress *to_mac_addr,
559 unsigned int size)
560{
561 const int rate = 11000000;
562
563 header->frame_control = htons (IEEE80211_FC0_TYPE_DATA);
564 header->addr1 = *to_mac_addr;
565 header->addr2 = plugin->mac_address;
566 header->addr3 = mac_bssid_gnunet;
567 header->duration = GNUNET_htole16 ((size * 1000000) / rate + 290);
568 header->sequence_control = 0; // FIXME?
569 header->llc[0] = WLAN_LLC_DSAP_FIELD;
570 header->llc[1] = WLAN_LLC_SSAP_FIELD;
571 header->llc[2] = 0; // FIXME?
572 header->llc[3] = 0; // FIXME?
573}
574
575
576/**
577 * Send an ACK for a fragment we received.
578 *
579 * @param cls the 'struct MacEndpoint' the ACK must be sent to
580 * @param msg_id id of the message
581 * @param hdr pointer to the hdr where the ack is stored
582 */
583static void
584send_ack (void *cls, uint32_t msg_id,
585 const struct GNUNET_MessageHeader *hdr)
586{
587 struct MacEndpoint *endpoint = cls;
588 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage* radio_header;
589 uint16_t msize = ntohs (hdr->size);
590 size_t size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + msize;
591 char buf[size];
592
593 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
594 {
595 GNUNET_break (0);
596 return;
597 }
598 LOG (GNUNET_ERROR_TYPE_DEBUG,
599 "Sending ACK to helper\n");
600 radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
601 get_radiotap_header (endpoint, radio_header, size);
602 get_wlan_header (endpoint->plugin,
603 &radio_header->frame,
604 &endpoint->addr.mac,
605 size);
606 memcpy (&radio_header[1], hdr, msize);
607 if (NULL !=
608 GNUNET_HELPER_send (endpoint->plugin->suid_helper,
609 &radio_header->header,
610 GNUNET_NO /* dropping ACKs is bad */,
611 NULL, NULL))
612 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# Bluetooth ACKs sent"),
613 1, GNUNET_NO);
614}
615
616
617/**
618 * Handles the data after all fragments are put together
619 *
620 * @param cls macendpoint this messages belongs to
621 * @param hdr pointer to the data
622 */
623static void
624bluetooth_data_message_handler (void *cls, const struct GNUNET_MessageHeader *hdr)
625{
626 struct MacEndpoint *endpoint = cls;
627 struct Plugin *plugin = endpoint->plugin;
628 struct MacAndSession mas;
629
630 GNUNET_STATISTICS_update (plugin->env->stats,
631 _("# Bluetooth messages defragmented"), 1,
632 GNUNET_NO);
633 mas.session = NULL;
634 mas.endpoint = endpoint;
635 (void) GNUNET_SERVER_mst_receive (plugin->fragment_data_tokenizer,
636 &mas,
637 (const char *) hdr,
638 ntohs (hdr->size),
639 GNUNET_YES, GNUNET_NO);
640}
641
642
643/**
644 * Free a session
645 *
646 * @param session the session free
647 */
648static void
649free_session (struct Session *session)
650{
651 struct MacEndpoint *endpoint = session->mac;
652 struct PendingMessage *pm;
653
654 endpoint->plugin->env->session_end (endpoint->plugin->env->cls,
655 &session->target,
656 session);
657 while (NULL != (pm = session->pending_message_head))
658 {
659 GNUNET_CONTAINER_DLL_remove (session->pending_message_head,
660 session->pending_message_tail, pm);
661 if (GNUNET_SCHEDULER_NO_TASK != pm->timeout_task)
662 {
663 GNUNET_SCHEDULER_cancel (pm->timeout_task);
664 pm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
665 }
666 GNUNET_free (pm->msg);
667 GNUNET_free (pm);
668 }
669 GNUNET_CONTAINER_DLL_remove (endpoint->sessions_head,
670 endpoint->sessions_tail,
671 session);
672 if (session->timeout_task != GNUNET_SCHEDULER_NO_TASK)
673 {
674 GNUNET_SCHEDULER_cancel (session->timeout_task);
675 session->timeout_task = GNUNET_SCHEDULER_NO_TASK;
676 }
677 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# Bluetooth sessions allocated"), -1,
678 GNUNET_NO);
679 GNUNET_free (session);
680}
681
682
683/**
684 * A session is timing out. Clean up.
685 *
686 * @param cls pointer to the Session
687 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
688 */
689static void
690session_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
691{
692 struct Session * session = cls;
693 struct GNUNET_TIME_Relative timeout;
694
695 session->timeout_task = GNUNET_SCHEDULER_NO_TASK;
696 timeout = GNUNET_TIME_absolute_get_remaining (session->timeout);
697 if (0 == timeout.rel_value)
698 {
699 free_session (session);
700 return;
701 }
702 session->timeout_task =
703 GNUNET_SCHEDULER_add_delayed (timeout, &session_timeout, session);
704}
705
706
707/**
708 * Create a new session
709 *
710 * @param endpoint pointer to the mac endpoint of the peer
711 * @param peer peer identity to use for this session
712 * @return returns the session
713 */
714static struct Session *
715create_session (struct MacEndpoint *endpoint,
716 const struct GNUNET_PeerIdentity *peer)
717{
718 struct Session *session;
719
720 for (session = endpoint->sessions_head; NULL != session; session = session->next)
721 if (0 == memcmp (peer, &session->target,
722 sizeof (struct GNUNET_PeerIdentity)))
723 {
724 session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
725 return session;
726 }
727 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# Bluetooth sessions allocated"), 1,
728 GNUNET_NO);
729 session = GNUNET_malloc (sizeof (struct Session));
730 GNUNET_CONTAINER_DLL_insert_tail (endpoint->sessions_head,
731 endpoint->sessions_tail,
732 session);
733 session->mac = endpoint;
734 session->target = *peer;
735 session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
736 session->timeout_task =
737 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, &session_timeout, session);
738 LOG (GNUNET_ERROR_TYPE_DEBUG,
739 "Created new session for peer `%s' with endpoint %s\n",
740 GNUNET_i2s (peer),
741 mac_to_string (&endpoint->addr.mac));
742 return session;
743}
744
745
746/**
747 * Function called once we have successfully given the fragment
748 * message to the SUID helper process and we are thus ready for
749 * the next fragment.
750 *
751 * @param cls the 'struct FragmentMessage'
752 * @param result result of the operation (GNUNET_OK on success, GNUNET_NO if the helper died, GNUNET_SYSERR
753 * if the helper was stopped)
754 */
755static void
756fragment_transmission_done (void *cls,
757 int result)
758{
759 struct FragmentMessage *fm = cls;
760
761
762 fm->sh = NULL;
763 GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
764}
765
766
767/**
768 * Transmit a fragment of a message.
769 *
770 * @param cls 'struct FragmentMessage' this fragment message belongs to
771 * @param hdr pointer to the start of the fragment message
772 */
773static void
774transmit_fragment (void *cls,
775 const struct GNUNET_MessageHeader *hdr)
776{
777 struct FragmentMessage *fm = cls;
778 struct MacEndpoint *endpoint = fm->macendpoint;
779 size_t size;
780 uint16_t msize;
781
782 msize = ntohs (hdr->size);
783 size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + msize;
784 {
785 char buf[size];
786 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radio_header;
787
788 radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
789 get_radiotap_header (endpoint, radio_header, size);
790 get_wlan_header (endpoint->plugin,
791 &radio_header->frame,
792 &endpoint->addr.mac,
793 size);
794 memcpy (&radio_header[1], hdr, msize);
795 GNUNET_assert (NULL == fm->sh);
796 fm->sh = GNUNET_HELPER_send (endpoint->plugin->suid_helper,
797 &radio_header->header,
798 GNUNET_NO,
799 &fragment_transmission_done, fm);
800 fm->size_on_wire += size;
801 if (NULL != fm->sh)
802 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# Bluetooth message fragments sent"),
803 1, GNUNET_NO);
804 else
805 GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
806 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
807 "# bytes currently in Bluetooth buffers",
808 -msize, GNUNET_NO);
809 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
810 "# bytes transmitted via Bluetooth",
811 msize, GNUNET_NO);
812 }
813}
814
815
816/**
817 * Frees the space of a message in the fragment queue (send queue)
818 *
819 * @param fm message to free
820 */
821static void
822free_fragment_message (struct FragmentMessage *fm)
823{
824 struct MacEndpoint *endpoint = fm->macendpoint;
825
826 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# Bluetooth messages pending (with fragmentation)"),
827 -1, GNUNET_NO);
828 GNUNET_CONTAINER_DLL_remove (endpoint->sending_messages_head,
829 endpoint->sending_messages_tail, fm);
830 if (NULL != fm->sh)
831 {
832 GNUNET_HELPER_send_cancel (fm->sh);
833 fm->sh = NULL;
834 }
835 GNUNET_FRAGMENT_context_destroy (fm->fragcontext,
836 &endpoint->msg_delay,
837 &endpoint->ack_delay);
838 if (fm->timeout_task != GNUNET_SCHEDULER_NO_TASK)
839 {
840 GNUNET_SCHEDULER_cancel (fm->timeout_task);
841 fm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
842 }
843 GNUNET_free (fm);
844}
845
846
847/**
848 * A FragmentMessage has timed out. Remove it.
849 *
850 * @param cls pointer to the 'struct FragmentMessage'
851 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
852 */
853static void
854fragmentmessage_timeout (void *cls,
855 const struct GNUNET_SCHEDULER_TaskContext *tc)
856{
857 struct FragmentMessage *fm = cls;
858
859 fm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
860 if (NULL != fm->cont)
861 {
862 fm->cont (fm->cont_cls, &fm->target, GNUNET_SYSERR, fm->size_payload, fm->size_on_wire);
863 fm->cont = NULL;
864 }
865 free_fragment_message (fm);
866}
867
868
869/**
870 * Transmit a message to the given destination with fragmentation.
871 *
872 * @param endpoint desired destination
873 * @param timeout how long can the message wait?
874 * @param target peer that should receive the message
875 * @param msg message to transmit
876 * @param payload_size bytes of payload
877 * @param cont continuation to call once the message has
878 * been transmitted (or if the transport is ready
879 * for the next transmission call; or if the
880 * peer disconnected...); can be NULL
881 * @param cont_cls closure for cont
882 */
883static void
884send_with_fragmentation (struct MacEndpoint *endpoint,
885 struct GNUNET_TIME_Relative timeout,
886 const struct GNUNET_PeerIdentity *target,
887 const struct GNUNET_MessageHeader *msg,
888 size_t payload_size,
889 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
890
891{
892 struct FragmentMessage *fm;
893 struct Plugin *plugin;
894
895 plugin = endpoint->plugin;
896 fm = GNUNET_malloc (sizeof (struct FragmentMessage));
897 fm->macendpoint = endpoint;
898 fm->target = *target;
899 fm->size_payload = payload_size;
900 fm->size_on_wire = 0;
901 fm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
902 fm->cont = cont;
903 fm->cont_cls = cont_cls;
904 /* 1 MBit/s typical data rate, 1430 byte fragments => ~100 ms per message */
905 fm->fragcontext =
906 GNUNET_FRAGMENT_context_create (plugin->env->stats, WLAN_MTU,
907 &plugin->tracker,
908 endpoint->msg_delay,
909 endpoint->ack_delay,
910 msg,
911 &transmit_fragment, fm);
912 fm->timeout_task =
913 GNUNET_SCHEDULER_add_delayed (timeout,
914 &fragmentmessage_timeout, fm);
915 GNUNET_CONTAINER_DLL_insert_tail (endpoint->sending_messages_head,
916 endpoint->sending_messages_tail,
917 fm);
918}
919
920
921/**
922 * Free a MAC endpoint.
923 *
924 * @param endpoint pointer to the MacEndpoint to free
925 */
926static void
927free_macendpoint (struct MacEndpoint *endpoint)
928{
929 struct Plugin *plugin = endpoint->plugin;
930 struct FragmentMessage *fm;
931 struct Session *session;
932
933 GNUNET_STATISTICS_update (plugin->env->stats,
934 _("# Bluetooth MAC endpoints allocated"), -1, GNUNET_NO);
935 while (NULL != (session = endpoint->sessions_head))
936 free_session (session);
937 while (NULL != (fm = endpoint->sending_messages_head))
938 free_fragment_message (fm);
939 GNUNET_CONTAINER_DLL_remove (plugin->mac_head,
940 plugin->mac_tail,
941 endpoint);
942
943 if (NULL != endpoint->defrag)
944 {
945 GNUNET_DEFRAGMENT_context_destroy(endpoint->defrag);
946 endpoint->defrag = NULL;
947 }
948
949 plugin->mac_count--;
950 if (GNUNET_SCHEDULER_NO_TASK != endpoint->timeout_task)
951 {
952 GNUNET_SCHEDULER_cancel (endpoint->timeout_task);
953 endpoint->timeout_task = GNUNET_SCHEDULER_NO_TASK;
954 }
955 GNUNET_free (endpoint);
956}
957
958
959/**
960 * A MAC endpoint is timing out. Clean up.
961 *
962 * @param cls pointer to the MacEndpoint
963 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
964 */
965static void
966macendpoint_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
967{
968 struct MacEndpoint *endpoint = cls;
969 struct GNUNET_TIME_Relative timeout;
970
971 endpoint->timeout_task = GNUNET_SCHEDULER_NO_TASK;
972 timeout = GNUNET_TIME_absolute_get_remaining (endpoint->timeout);
973 if (0 == timeout.rel_value)
974 {
975 free_macendpoint (endpoint);
976 return;
977 }
978 endpoint->timeout_task =
979 GNUNET_SCHEDULER_add_delayed (timeout, &macendpoint_timeout,
980 endpoint);
981}
982
983
984/**
985 * Find (or create) a MacEndpoint with a specific MAC address
986 *
987 * @param plugin pointer to the plugin struct
988 * @param addr the MAC address of the endpoint
989 * @return handle to our data structure for this MAC
990 */
991static struct MacEndpoint *
992create_macendpoint (struct Plugin *plugin,
993 const struct WlanAddress *addr)
994{
995 struct MacEndpoint *pos;
996
997 for (pos = plugin->mac_head; NULL != pos; pos = pos->next)
998 if (0 == memcmp (addr, &pos->addr, sizeof (struct WlanAddress)))
999 return pos;
1000 pos = GNUNET_malloc (sizeof (struct MacEndpoint));
1001 pos->addr = *addr;
1002 pos->plugin = plugin;
1003 pos->defrag =
1004 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, WLAN_MTU,
1005 MESSAGES_IN_DEFRAG_QUEUE_PER_MAC,
1006 pos,
1007 &bluetooth_data_message_handler,
1008 &send_ack);
1009
1010 pos->msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
1011 pos->ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1012 100);
1013 pos->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
1014 pos->timeout_task =
1015 GNUNET_SCHEDULER_add_delayed (MACENDPOINT_TIMEOUT, &macendpoint_timeout,
1016 pos);
1017 GNUNET_CONTAINER_DLL_insert (plugin->mac_head, plugin->mac_tail, pos);
1018 plugin->mac_count++;
1019 GNUNET_STATISTICS_update (plugin->env->stats, _("# Bluetooth MAC endpoints allocated"),
1020 1, GNUNET_NO);
1021 LOG (GNUNET_ERROR_TYPE_DEBUG,
1022 "New MAC endpoint `%s'\n",
1023 bluetooth_plugin_address_to_string(NULL, addr, sizeof (struct WlanAddress)));
1024 return pos;
1025}
1026
1027/**
1028 * Function obtain the network type for a session
1029 *
1030 * @param cls closure ('struct Plugin*')
1031 * @param session the session
1032 * @return the network type in HBO or GNUNET_SYSERR
1033 */
1034static enum GNUNET_ATS_Network_Type
1035bluetooth_get_network (void *cls, void *session)
1036{
1037 GNUNET_assert (NULL != session);
1038 return GNUNET_ATS_NET_BT;
1039}
1040
1041
1042/**
1043 * Creates a new outbound session the transport service will use to send data to the
1044 * peer
1045 *
1046 * @param cls the plugin
1047 * @param address the address
1048 * @return the session or NULL of max connections exceeded
1049 */
1050static struct Session *
1051bluetooth_plugin_get_session (void *cls,
1052 const struct GNUNET_HELLO_Address *address)
1053{
1054 struct Plugin *plugin = cls;
1055 struct MacEndpoint *endpoint;
1056
1057 if (NULL == address)
1058 return NULL;
1059 if (sizeof (struct WlanAddress) != address->address_length)
1060 {
1061 GNUNET_break (0);
1062 return NULL;
1063 }
1064 LOG (GNUNET_ERROR_TYPE_DEBUG,
1065 "Service asked to create session for peer `%s' with MAC `%s'\n",
1066 GNUNET_i2s (&address->peer),
1067 bluetooth_plugin_address_to_string(NULL, address->address, address->address_length));
1068 endpoint = create_macendpoint (plugin, address->address);
1069 return create_session (endpoint, &address->peer);
1070}
1071
1072
1073/**
1074 * Function that can be used to force the plugin to disconnect
1075 * from the given peer and cancel all previous transmissions
1076 * (and their continuation).
1077 *
1078 * @param cls closure
1079 * @param target peer from which to disconnect
1080 */
1081static void
1082bluetooth_plugin_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
1083{
1084 struct Plugin *plugin = cls;
1085 struct Session *session;
1086 struct MacEndpoint *endpoint;
1087
1088 for (endpoint = plugin->mac_head; NULL != endpoint; endpoint = endpoint->next)
1089 for (session = endpoint->sessions_head; NULL != session; session = session->next)
1090 if (0 == memcmp (target, &session->target,
1091 sizeof (struct GNUNET_PeerIdentity)))
1092 {
1093 free_session (session);
1094 break; /* inner-loop only (in case peer has another MAC as well!) */
1095 }
1096}
1097
1098
1099/**
1100 * Function that can be used by the transport service to transmit
1101 * a message using the plugin. Note that in the case of a
1102 * peer disconnecting, the continuation MUST be called
1103 * prior to the disconnect notification itself. This function
1104 * will be called with this peer's HELLO message to initiate
1105 * a fresh connection to another peer.
1106 *
1107 * @param cls closure
1108 * @param session which session must be used
1109 * @param msgbuf the message to transmit
1110 * @param msgbuf_size number of bytes in 'msgbuf'
1111 * @param priority how important is the message (most plugins will
1112 * ignore message priority and just FIFO)
1113 * @param to how long to wait at most for the transmission (does not
1114 * require plugins to discard the message after the timeout,
1115 * just advisory for the desired delay; most plugins will ignore
1116 * this as well)
1117 * @param cont continuation to call once the message has
1118 * been transmitted (or if the transport is ready
1119 * for the next transmission call; or if the
1120 * peer disconnected...); can be NULL
1121 * @param cont_cls closure for cont
1122 * @return number of bytes used (on the physical network, with overheads);
1123 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1124 * and does NOT mean that the message was not transmitted (DV)
1125 */
1126static ssize_t
1127bluetooth_plugin_send (void *cls,
1128 struct Session *session,
1129 const char *msgbuf, size_t msgbuf_size,
1130 unsigned int priority,
1131 struct GNUNET_TIME_Relative to,
1132 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1133{
1134 struct Plugin *plugin = cls;
1135 struct WlanHeader *wlanheader;
1136 size_t size = msgbuf_size + sizeof (struct WlanHeader);
1137 char buf[size] GNUNET_ALIGN;
1138
1139 LOG (GNUNET_ERROR_TYPE_DEBUG,
1140 "Transmitting %u bytes of payload to peer `%s' (starting with %u byte message of type %u)\n",
1141 msgbuf_size,
1142 GNUNET_i2s (&session->target),
1143 (unsigned int) ntohs (((struct GNUNET_MessageHeader*)msgbuf)->size),
1144 (unsigned int) ntohs (((struct GNUNET_MessageHeader*)msgbuf)->type));
1145 wlanheader = (struct WlanHeader *) buf;
1146 wlanheader->header.size = htons (msgbuf_size + sizeof (struct WlanHeader));
1147 wlanheader->header.type = htons (GNUNET_MESSAGE_TYPE_WLAN_DATA);
1148 wlanheader->sender = *plugin->env->my_identity;
1149 wlanheader->target = session->target;
1150 wlanheader->crc = htonl (GNUNET_CRYPTO_crc32_n (msgbuf, msgbuf_size));
1151 memcpy (&wlanheader[1], msgbuf, msgbuf_size);
1152
1153 GNUNET_STATISTICS_update (plugin->env->stats,
1154 "# bytes currently in Bluetooth buffers",
1155 msgbuf_size, GNUNET_NO);
1156
1157 send_with_fragmentation (session->mac,
1158 to,
1159 &session->target,
1160 &wlanheader->header,
1161 msgbuf_size,
1162 cont, cont_cls);
1163 return size;
1164}
1165
1166
1167/**
1168 * We have received data from the WLAN via some session. Process depending
1169 * on the message type (HELLO, DATA, FRAGMENTATION or FRAGMENTATION-ACK).
1170 *
1171 * @param cls pointer to the plugin
1172 * @param client pointer to the session this message belongs to
1173 * @param hdr start of the message
1174 */
1175static int
1176process_data (void *cls, void *client, const struct GNUNET_MessageHeader *hdr)
1177{
1178 struct Plugin *plugin = cls;
1179 struct MacAndSession *mas = client;
1180 struct MacAndSession xmas;
1181 struct GNUNET_ATS_Information ats;
1182 struct FragmentMessage *fm;
1183 struct GNUNET_PeerIdentity tmpsource;
1184 const struct WlanHeader *wlanheader;
1185 int ret;
1186 uint16_t msize;
1187
1188 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
1189 ats.value = htonl (GNUNET_ATS_NET_BT);
1190 msize = ntohs (hdr->size);
1191
1192 GNUNET_STATISTICS_update (plugin->env->stats,
1193 "# bytes received via Bluetooth",
1194 msize, GNUNET_NO);
1195
1196 switch (ntohs (hdr->type))
1197 {
1198 case GNUNET_MESSAGE_TYPE_HELLO:
1199 if (GNUNET_OK !=
1200 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hdr, &tmpsource))
1201 {
1202 GNUNET_break_op (0);
1203 break;
1204 }
1205 LOG (GNUNET_ERROR_TYPE_DEBUG,
1206 "Processing %u bytes of HELLO from peer `%s' at MAC %s\n",
1207 (unsigned int) msize,
1208 GNUNET_i2s (&tmpsource),
1209 bluetooth_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
1210
1211 GNUNET_STATISTICS_update (plugin->env->stats,
1212 _("# HELLO messages received via WLAN"), 1,
1213 GNUNET_NO);
1214 plugin->env->receive (plugin->env->cls,
1215 &tmpsource,
1216 hdr,
1217 mas->session,
1218 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1219 (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1220 plugin->env->update_address_metrics (plugin->env->cls,
1221 &tmpsource,
1222 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1223 (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress),
1224 mas->session,
1225 &ats, 1);
1226 break;
1227 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1228 if (NULL == mas->endpoint)
1229 {
1230 GNUNET_break (0);
1231 break;
1232 }
1233 LOG (GNUNET_ERROR_TYPE_DEBUG,
1234 "Processing %u bytes of FRAGMENT from MAC %s\n",
1235 (unsigned int) msize,
1236 bluetooth_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
1237 GNUNET_STATISTICS_update (plugin->env->stats,
1238 _("# fragments received via Bluetooth"), 1, GNUNET_NO);
1239 (void) GNUNET_DEFRAGMENT_process_fragment (mas->endpoint->defrag,
1240 hdr);
1241 break;
1242 case GNUNET_MESSAGE_TYPE_FRAGMENT_ACK:
1243 if (NULL == mas->endpoint)
1244 {
1245 GNUNET_break (0);
1246 break;
1247 }
1248 GNUNET_STATISTICS_update (plugin->env->stats, _("# ACKs received via Bluetooth"),
1249 1, GNUNET_NO);
1250 for (fm = mas->endpoint->sending_messages_head; NULL != fm; fm = fm->next)
1251 {
1252 ret = GNUNET_FRAGMENT_process_ack (fm->fragcontext, hdr);
1253 if (GNUNET_OK == ret)
1254 {
1255 LOG (GNUNET_ERROR_TYPE_DEBUG,
1256 "Got last ACK, finished message transmission to `%s' (%p)\n",
1257 bluetooth_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)),
1258 fm);
1259 mas->endpoint->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
1260 if (NULL != fm->cont)
1261 {
1262 fm->cont (fm->cont_cls, &fm->target, GNUNET_OK, fm->size_payload, fm->size_on_wire);
1263 fm->cont = NULL;
1264 }
1265 free_fragment_message (fm);
1266 break;
1267 }
1268 if (GNUNET_NO == ret)
1269 {
1270 LOG (GNUNET_ERROR_TYPE_DEBUG,
1271 "Got an ACK, message transmission to `%s' not yet finished\n",
1272 bluetooth_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
1273 break;
1274 }
1275 }
1276 LOG (GNUNET_ERROR_TYPE_DEBUG,
1277 "ACK not matched against any active fragmentation with MAC `%s'\n",
1278 bluetooth_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
1279 break;
1280 case GNUNET_MESSAGE_TYPE_WLAN_DATA:
1281 if (NULL == mas->endpoint)
1282 {
1283 GNUNET_break (0);
1284 break;
1285 }
1286 if (msize < sizeof (struct WlanHeader))
1287 {
1288 GNUNET_break (0);
1289 break;
1290 }
1291 wlanheader = (const struct WlanHeader *) hdr;
1292 if (0 != memcmp (&wlanheader->target,
1293 plugin->env->my_identity,
1294 sizeof (struct GNUNET_PeerIdentity)))
1295 {
1296 LOG (GNUNET_ERROR_TYPE_DEBUG,
1297 "Bluetooth data for `%s', not for me, ignoring\n",
1298 GNUNET_i2s (&wlanheader->target));
1299 break;
1300 }
1301 if (ntohl (wlanheader->crc) !=
1302 GNUNET_CRYPTO_crc32_n (&wlanheader[1], msize - sizeof (struct WlanHeader)))
1303 {
1304 GNUNET_STATISTICS_update (plugin->env->stats,
1305 _("# BluetoothDATA messages discarded due to CRC32 error"), 1,
1306 GNUNET_NO);
1307 break;
1308 }
1309 xmas.endpoint = mas->endpoint;
1310 xmas.session = create_session (mas->endpoint, &wlanheader->sender);
1311 LOG (GNUNET_ERROR_TYPE_DEBUG,
1312 "Processing %u bytes of WLAN DATA from peer `%s'\n",
1313 (unsigned int) msize,
1314 GNUNET_i2s (&wlanheader->sender));
1315 (void) GNUNET_SERVER_mst_receive (plugin->wlan_header_payload_tokenizer,
1316 &xmas,
1317 (const char *) &wlanheader[1],
1318 msize - sizeof (struct WlanHeader),
1319 GNUNET_YES, GNUNET_NO);
1320 break;
1321 default:
1322 if (NULL == mas->endpoint)
1323 {
1324 GNUNET_break (0);
1325 break;
1326 }
1327 if (NULL == mas->session)
1328 {
1329 GNUNET_break (0);
1330 break;
1331 }
1332 LOG (GNUNET_ERROR_TYPE_DEBUG,
1333 "Received packet with %u bytes of type %u from peer %s\n",
1334 (unsigned int) msize,
1335 (unsigned int) ntohs (hdr->type),
1336 GNUNET_i2s (&mas->session->target));
1337 plugin->env->receive (plugin->env->cls,
1338 &mas->session->target,
1339 hdr,
1340 mas->session,
1341 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1342 (mas->endpoint == NULL) ? 0 : sizeof (struct WlanAddress));
1343 plugin->env->update_address_metrics (plugin->env->cls,
1344 &mas->session->target,
1345 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1346 (mas->endpoint == NULL) ? 0 : sizeof (struct WlanAddress),
1347 mas->session,
1348 &ats, 1);
1349 break;
1350 }
1351 return GNUNET_OK;
1352}
1353
1354
1355/**
1356 * Function used for to process the data from the suid process
1357 *
1358 * @param cls the plugin handle
1359 * @param client client that send the data (not used)
1360 * @param hdr header of the GNUNET_MessageHeader
1361 */
1362static int
1363handle_helper_message (void *cls, void *client,
1364 const struct GNUNET_MessageHeader *hdr)
1365{
1366 struct Plugin *plugin = cls;
1367 const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *rxinfo;
1368 const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *cm;
1369 struct WlanAddress wa;
1370 struct MacAndSession mas;
1371 uint16_t msize;
1372
1373 msize = ntohs (hdr->size);
1374 switch (ntohs (hdr->type))
1375 {
1376 case GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL:
1377 if (msize != sizeof (struct GNUNET_TRANSPORT_WLAN_HelperControlMessage))
1378 {
1379 GNUNET_break (0);
1380 break;
1381 }
1382 cm = (const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *) hdr;
1383 if (GNUNET_YES == plugin->have_mac)
1384 {
1385 if (0 == memcmp (&plugin->mac_address,
1386 &cm->mac,
1387 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1388 break; /* no change */
1389 /* remove old address */
1390 memset (&wa, 0, sizeof (struct WlanAddress));
1391 wa.mac = plugin->mac_address;
1392 wa.options = htonl(plugin->options);
1393 plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
1394 &wa,
1395 sizeof (wa),
1396 "wlan");
1397 }
1398 plugin->mac_address = cm->mac;
1399 plugin->have_mac = GNUNET_YES;
1400 memset (&wa, 0, sizeof (struct WlanAddress));
1401 wa.mac = plugin->mac_address;
1402 wa.options = htonl(plugin->options);
1403 LOG (GNUNET_ERROR_TYPE_DEBUG,
1404 "Received WLAN_HELPER_CONTROL message with MAC address `%s' for peer `%s'\n",
1405 mac_to_string (&cm->mac),
1406 GNUNET_i2s (plugin->env->my_identity));
1407 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1408 &wa,
1409 sizeof (struct WlanAddress),
1410 "wlan");
1411 break;
1412 case GNUNET_MESSAGE_TYPE_WLAN_DATA_FROM_HELPER:
1413 LOG (GNUNET_ERROR_TYPE_DEBUG,
1414 "Got data message from helper with %u bytes\n",
1415 msize);
1416 GNUNET_STATISTICS_update (plugin->env->stats,
1417 _("# DATA messages received via Bluetooth"), 1,
1418 GNUNET_NO);
1419 if (msize < sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage))
1420 {
1421 GNUNET_break (0);
1422 LOG (GNUNET_ERROR_TYPE_DEBUG,
1423 "Size of packet is too small (%u bytes)\n",
1424 msize);
1425 break;
1426 }
1427 rxinfo = (const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *) hdr;
1428
1429 /* check if message is actually for us */
1430 if (0 != memcmp (&rxinfo->frame.addr3, &mac_bssid_gnunet,
1431 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1432 {
1433 /* Not the GNUnet BSSID */
1434 break;
1435 }
1436 if ( (0 != memcmp (&rxinfo->frame.addr1, &bc_all_mac,
1437 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))) &&
1438 (0 != memcmp (&rxinfo->frame.addr1, &plugin->mac_address,
1439 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))) )
1440 {
1441 /* Neither broadcast nor specifically for us */
1442 break;
1443 }
1444 if (0 == memcmp (&rxinfo->frame.addr2, &plugin->mac_address,
1445 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1446 {
1447 /* packet is FROM us, thus not FOR us */
1448 break;
1449 }
1450
1451 GNUNET_STATISTICS_update (plugin->env->stats,
1452 _("# Bluetooth DATA messages processed"),
1453 1, GNUNET_NO);
1454 LOG (GNUNET_ERROR_TYPE_DEBUG,
1455 "Receiving %u bytes of data from MAC `%s'\n",
1456 (unsigned int) (msize - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage)),
1457 mac_to_string (&rxinfo->frame.addr2));
1458 wa.mac = rxinfo->frame.addr2;
1459 wa.options = htonl (0);
1460 mas.endpoint = create_macendpoint (plugin, &wa);
1461 mas.session = NULL;
1462 (void) GNUNET_SERVER_mst_receive (plugin->helper_payload_tokenizer,
1463 &mas,
1464 (const char*) &rxinfo[1],
1465 msize - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage),
1466 GNUNET_YES, GNUNET_NO);
1467 break;
1468 default:
1469 GNUNET_break (0);
1470 LOG (GNUNET_ERROR_TYPE_DEBUG,
1471 "Unexpected message of type %u (%u bytes)",
1472 ntohs (hdr->type), ntohs (hdr->size));
1473 break;
1474 }
1475 return GNUNET_OK;
1476}
1477
1478
1479
1480/**
1481 * Task to (periodically) send a HELLO beacon
1482 *
1483 * @param cls pointer to the plugin struct
1484 * @param tc scheduler context
1485 */
1486static void
1487send_hello_beacon (void *cls,
1488 const struct GNUNET_SCHEDULER_TaskContext *tc)
1489{
1490 struct Plugin *plugin = cls;
1491 uint16_t size;
1492 uint16_t hello_size;
1493 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radioHeader;
1494 const struct GNUNET_MessageHeader *hello;
1495
1496 hello = plugin->env->get_our_hello ();
1497 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
1498 GNUNET_assert (sizeof (struct WlanHeader) + hello_size <= WLAN_MTU);
1499 size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + hello_size;
1500 {
1501 char buf[size] GNUNET_ALIGN;
1502
1503 LOG (GNUNET_ERROR_TYPE_DEBUG,
1504 "Sending %u byte HELLO beacon\n",
1505 (unsigned int) size);
1506 radioHeader = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage*) buf;
1507 get_radiotap_header (NULL, radioHeader, size);
1508 get_wlan_header (plugin, &radioHeader->frame, &bc_all_mac, size);
1509 memcpy (&radioHeader[1], hello, hello_size);
1510 if (NULL !=
1511 GNUNET_HELPER_send (plugin->suid_helper,
1512 &radioHeader->header,
1513 GNUNET_YES /* can drop */,
1514 NULL, NULL))
1515 GNUNET_STATISTICS_update (plugin->env->stats, _("# HELLO beacons sent via Bluetooth"),
1516 1, GNUNET_NO);
1517 }
1518 plugin->beacon_task =
1519 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
1520 (HELLO_BEACON_SCALING_FACTOR,
1521 plugin->mac_count + 1),
1522 &send_hello_beacon,
1523 plugin);
1524
1525}
1526
1527
1528/**
1529 * Another peer has suggested an address for this
1530 * peer and transport plugin. Check that this could be a valid
1531 * address. If so, consider adding it to the list
1532 * of addresses.
1533 *
1534 * @param cls closure
1535 * @param addr pointer to the address
1536 * @param addrlen length of addr
1537 * @return GNUNET_OK if this is a plausible address for this peer
1538 * and transport
1539 */
1540static int
1541bluetooth_plugin_address_suggested (void *cls, const void *addr, size_t addrlen)
1542{
1543 struct Plugin *plugin = cls;
1544 struct WlanAddress *wa = (struct WlanAddress *) addr;
1545
1546 if (addrlen != sizeof (struct WlanAddress))
1547 {
1548 GNUNET_break_op (0);
1549 return GNUNET_SYSERR;
1550 }
1551 if (GNUNET_YES != plugin->have_mac)
1552 {
1553 LOG (GNUNET_ERROR_TYPE_DEBUG,
1554 "Rejecting MAC `%s': I don't know my MAC!\n",
1555 mac_to_string (addr));
1556 return GNUNET_NO; /* don't know my MAC */
1557 }
1558 if (0 != memcmp (&wa->mac,
1559 &plugin->mac_address,
1560 sizeof (wa->mac)))
1561 {
1562 LOG (GNUNET_ERROR_TYPE_DEBUG,
1563 "Rejecting MAC `%s': not my MAC!\n",
1564 mac_to_string (addr));
1565 return GNUNET_NO; /* not my MAC */
1566 }
1567 return GNUNET_OK;
1568}
1569
1570
1571/**
1572 * Function called for a quick conversion of the binary address to
1573 * a numeric address. Note that the caller must not free the
1574 * address and that the next call to this function is allowed
1575 * to override the address again.
1576 *
1577 * @param cls closure
1578 * @param addr binary address
1579 * @param addrlen length of the address
1580 * @return string representing the same address
1581 */
1582static const char *
1583bluetooth_plugin_address_to_string (void *cls, const void *addr, size_t addrlen)
1584{
1585 const struct GNUNET_TRANSPORT_WLAN_MacAddress *mac;
1586 static char macstr[36];
1587
1588 if (sizeof (struct WlanAddress) != addrlen)
1589 {
1590 GNUNET_break (0);
1591 return NULL;
1592 }
1593 mac = &((struct WlanAddress *) addr)->mac;
1594 GNUNET_snprintf (macstr, sizeof (macstr), "%s.%u.%s",
1595 PLUGIN_NAME, ntohl (((struct WlanAddress *) addr)->options),
1596 mac_to_string (mac));
1597 return macstr;
1598}
1599
1600
1601/**
1602 * Convert the transports address to a nice, human-readable format.
1603 *
1604 * @param cls closure
1605 * @param type name of the transport that generated the address
1606 * @param addr one of the addresses of the host, NULL for the last address
1607 * the specific address format depends on the transport
1608 * @param addrlen length of the address
1609 * @param numeric should (IP) addresses be displayed in numeric form?
1610 * @param timeout after how long should we give up?
1611 * @param asc function to call on each string
1612 * @param asc_cls closure for asc
1613 */
1614static void
1615bluetooth_plugin_address_pretty_printer (void *cls, const char *type,
1616 const void *addr, size_t addrlen,
1617 int numeric,
1618 struct GNUNET_TIME_Relative timeout,
1619 GNUNET_TRANSPORT_AddressStringCallback asc,
1620 void *asc_cls)
1621{
1622 char *ret;
1623
1624 if (sizeof (struct WlanAddress) != addrlen)
1625 {
1626 /* invalid address */
1627 LOG (GNUNET_ERROR_TYPE_WARNING,
1628 _("Bluetooth address with invalid size encountered\n"));
1629 asc (asc_cls, NULL);
1630 return;
1631 }
1632 ret = GNUNET_strdup (bluetooth_plugin_address_to_string(NULL, addr, addrlen));
1633 asc (asc_cls, ret);
1634 GNUNET_free (ret);
1635 asc (asc_cls, NULL);
1636}
1637
1638
1639/**
1640 * Exit point from the plugin.
1641 *
1642 * @param cls pointer to the api struct
1643 */
1644void *
1645libgnunet_plugin_transport_bluetooth_done (void *cls)
1646{
1647 struct WlanAddress wa;
1648 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1649 struct Plugin *plugin = api->cls;
1650 struct MacEndpoint *endpoint;
1651 struct MacEndpoint *endpoint_next;
1652
1653 if (NULL == plugin)
1654 {
1655 GNUNET_free (api);
1656 return NULL;
1657 }
1658
1659 if (GNUNET_YES == plugin->have_mac)
1660 {
1661 memset (&wa, 0, sizeof (wa));
1662 wa.options = htonl (plugin->options);
1663 wa.mac = plugin->mac_address;
1664 plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
1665 &wa,
1666 sizeof (struct WlanAddress),
1667 "wlan");
1668 plugin->have_mac = GNUNET_NO;
1669 }
1670
1671 if (GNUNET_SCHEDULER_NO_TASK != plugin->beacon_task)
1672 {
1673 GNUNET_SCHEDULER_cancel (plugin->beacon_task);
1674 plugin->beacon_task = GNUNET_SCHEDULER_NO_TASK;
1675 }
1676 if (NULL != plugin->suid_helper)
1677 {
1678 GNUNET_HELPER_stop (plugin->suid_helper, GNUNET_NO);
1679 plugin->suid_helper = NULL;
1680 }
1681 endpoint_next = plugin->mac_head;
1682 while (NULL != (endpoint = endpoint_next))
1683 {
1684 endpoint_next = endpoint->next;
1685 free_macendpoint (endpoint);
1686 }
1687 if (NULL != plugin->fragment_data_tokenizer)
1688 {
1689 GNUNET_SERVER_mst_destroy (plugin->fragment_data_tokenizer);
1690 plugin->fragment_data_tokenizer = NULL;
1691 }
1692 if (NULL != plugin->wlan_header_payload_tokenizer)
1693 {
1694 GNUNET_SERVER_mst_destroy (plugin->wlan_header_payload_tokenizer);
1695 plugin->wlan_header_payload_tokenizer = NULL;
1696 }
1697 if (NULL != plugin->helper_payload_tokenizer)
1698 {
1699 GNUNET_SERVER_mst_destroy (plugin->helper_payload_tokenizer);
1700 plugin->helper_payload_tokenizer = NULL;
1701 }
1702 GNUNET_free_non_null (plugin->interface);
1703 GNUNET_free (plugin);
1704 GNUNET_free (api);
1705 return NULL;
1706}
1707
1708
1709/**
1710 * Function called to convert a string address to
1711 * a binary address.
1712 *
1713 * @param cls closure ('struct Plugin*')
1714 * @param addr string address
1715 * @param addrlen length of the address
1716 * @param buf location to store the buffer
1717 * @param added location to store the number of bytes in the buffer.
1718 * If the function returns GNUNET_SYSERR, its contents are undefined.
1719 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
1720 */
1721static int
1722bluetooth_string_to_address (void *cls, const char *addr, uint16_t addrlen,
1723 void **buf, size_t *added)
1724{
1725 struct WlanAddress *wa;
1726 unsigned int a[6];
1727 unsigned int i;
1728 char plugin[5];
1729 uint32_t options;
1730
1731 if ((NULL == addr) || (addrlen == 0))
1732 {
1733 GNUNET_break (0);
1734 return GNUNET_SYSERR;
1735 }
1736 if ('\0' != addr[addrlen - 1])
1737 {
1738 GNUNET_break (0);
1739 return GNUNET_SYSERR;
1740 }
1741 if (strlen (addr) != addrlen - 1)
1742 {
1743 GNUNET_break (0);
1744 return GNUNET_SYSERR;
1745 }
1746
1747 if (8 != SSCANF (addr,
1748 "%4s.%u.%X:%X:%X:%X:%X:%X",
1749 plugin, &options,
1750 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]))
1751 {
1752 GNUNET_break (0);
1753 return GNUNET_SYSERR;
1754 }
1755 wa = GNUNET_malloc (sizeof (struct WlanAddress));
1756 for (i=0;i<6;i++)
1757 wa->mac.mac[i] = a[i];
1758 wa->options = htonl (0);
1759 *buf = wa;
1760 *added = sizeof (struct WlanAddress);
1761 return GNUNET_OK;
1762}
1763
1764
1765/**
1766 * Entry point for the plugin.
1767 *
1768 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
1769 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
1770 */
1771void *
1772libgnunet_plugin_transport_bluetooth_init (void *cls)
1773{
1774 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1775 struct GNUNET_TRANSPORT_PluginFunctions *api;
1776 struct Plugin *plugin;
1777 char *interface;
1778 unsigned long long testmode;
1779 char *binary;
1780
1781 /* check for 'special' mode */
1782 if (NULL == env->receive)
1783 {
1784 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1785 initialze the plugin or the API */
1786 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1787 api->cls = NULL;
1788 api->address_pretty_printer = &bluetooth_plugin_address_pretty_printer;
1789 api->address_to_string = &bluetooth_plugin_address_to_string;
1790 api->string_to_address = &bluetooth_string_to_address;
1791 return api;
1792 }
1793
1794 testmode = 0;
1795 /* check configuration */
1796 if ( (GNUNET_YES ==
1797 GNUNET_CONFIGURATION_have_value (env->cfg, "transport-bluetooth", "TESTMODE")) &&
1798 ( (GNUNET_SYSERR ==
1799 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-bluetooth",
1800 "TESTMODE", &testmode)) ||
1801 (testmode > 2) ) )
1802 {
1803 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
1804 "transport-wlan", "TESTMODE");
1805 return NULL;
1806 }
1807 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-transport-bluetooth");
1808 if ( (0 == testmode) &&
1809 (GNUNET_YES != GNUNET_OS_check_helper_binary (binary, GNUNET_YES, NULL)) )
1810 {
1811 LOG (GNUNET_ERROR_TYPE_ERROR,
1812 _("Helper binary `%s' not SUID, cannot run WLAN transport\n"),
1813 "gnunet-helper-transport-bluetooth");
1814 GNUNET_free (binary);
1815 return NULL;
1816 }
1817 GNUNET_free (binary);
1818 if (GNUNET_YES !=
1819 GNUNET_CONFIGURATION_get_value_string
1820 (env->cfg, "transport-bluetooth", "INTERFACE",
1821 &interface))
1822 {
1823 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
1824 "transport-bluetooth", "INTERFACE");
1825 return NULL;
1826 }
1827
1828 plugin = GNUNET_malloc (sizeof (struct Plugin));
1829 plugin->interface = interface;
1830 plugin->env = env;
1831 GNUNET_STATISTICS_set (plugin->env->stats, _("# Bluetooth sessions allocated"),
1832 0, GNUNET_NO);
1833 GNUNET_STATISTICS_set (plugin->env->stats, _("# Bluetooth MAC endpoints allocated"),
1834 0, 0);
1835 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1836 GNUNET_BANDWIDTH_value_init (100 * 1024 *
1837 1024 / 8), 100);
1838 plugin->fragment_data_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1839 plugin->wlan_header_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1840 plugin->helper_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1841 plugin->beacon_task = GNUNET_SCHEDULER_add_now (&send_hello_beacon,
1842 plugin);
1843
1844 plugin->options = 0;
1845
1846 /* some compilers do not like switch on 'long long'... */
1847 switch ((unsigned int) testmode)
1848 {
1849 case 0: /* normal */
1850 plugin->helper_argv[0] = (char *) "gnunet-helper-transport-bluetooth";
1851 plugin->helper_argv[1] = interface;
1852 plugin->helper_argv[2] = NULL;
1853 plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
1854 "gnunet-helper-transport-bluetooth",
1855 plugin->helper_argv,
1856 &handle_helper_message,
1857 NULL,
1858 plugin);
1859 break;
1860 default:
1861 GNUNET_assert (0);
1862 }
1863
1864 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1865 api->cls = plugin;
1866 api->send = &bluetooth_plugin_send;
1867 api->get_session = &bluetooth_plugin_get_session;
1868 api->disconnect = &bluetooth_plugin_disconnect;
1869 api->address_pretty_printer = &bluetooth_plugin_address_pretty_printer;
1870 api->check_address = &bluetooth_plugin_address_suggested;
1871 api->address_to_string = &bluetooth_plugin_address_to_string;;
1872 api->string_to_address = &bluetooth_string_to_address;
1873 api->get_network = &bluetooth_get_network;
1874
1875 return api;
1876}
1877
1878
1879/* end of plugin_transport_bluetooth.c */