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-rw-r--r--src/transport/plugin_transport_wlan.c2404
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diff --git a/src/transport/plugin_transport_wlan.c b/src/transport/plugin_transport_wlan.c
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1/*
2 This file is part of GNUnet
3 Copyright (C) 2010-2014 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
21/**
22 * @file transport/plugin_transport_wlan.c
23 * @brief transport plugin for wlan and/or bluetooth
24 * @author David Brodski
25 * @author Christian Grothoff
26 *
27 * BUILD_WLAN or BUILD_BLUETOOTH must be defined such that the respective
28 * variant of this code is compiled.
29 */
30#include "platform.h"
31#include "gnunet_util_lib.h"
32#include "gnunet_hello_lib.h"
33#include "gnunet_protocols.h"
34#include "gnunet_statistics_service.h"
35#include "gnunet_transport_service.h"
36#include "gnunet_transport_plugin.h"
37#include "plugin_transport_wlan.h"
38#include "gnunet_fragmentation_lib.h"
39#include "gnunet_constants.h"
40
41
42#if BUILD_WLAN
43/* begin case wlan */
44#define PLUGIN_NAME "wlan"
45#define CONFIG_NAME "transport-wlan"
46#define HELPER_NAME "gnunet-helper-transport-wlan"
47#define DUMMY_HELPER_NAME "gnunet-helper-transport-wlan-dummy"
48#define LIBGNUNET_PLUGIN_TRANSPORT_INIT libgnunet_plugin_transport_wlan_init
49#define LIBGNUNET_PLUGIN_TRANSPORT_DONE libgnunet_plugin_transport_wlan_done
50#define LOG(kind, ...) GNUNET_log_from (kind, "transport-wlan", __VA_ARGS__)
51
52
53/**
54 * time out of a mac endpoint
55 */
56#define MACENDPOINT_TIMEOUT GNUNET_TIME_relative_multiply ( \
57 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2)
58
59/**
60 * We reduce the frequence of HELLO beacons in relation to
61 * the number of MAC addresses currently visible to us.
62 * This is the multiplication factor.
63 */
64#define HELLO_BEACON_SCALING_FACTOR GNUNET_TIME_relative_multiply ( \
65 GNUNET_TIME_UNIT_SECONDS, 2)
66
67
68/* end case wlan */
69#elif BUILD_BLUETOOTH
70/* begin case bluetooth */
71
72#define PLUGIN_NAME "bluetooth"
73#define CONFIG_NAME "transport-bluetooth"
74#define HELPER_NAME "gnunet-helper-transport-bluetooth"
75/* yes, this is correct, we use the same dummy driver as 'wlan' */
76#define DUMMY_HELPER_NAME "gnunet-helper-transport-wlan-dummy"
77#define LIBGNUNET_PLUGIN_TRANSPORT_INIT \
78 libgnunet_plugin_transport_bluetooth_init
79#define LIBGNUNET_PLUGIN_TRANSPORT_DONE \
80 libgnunet_plugin_transport_bluetooth_done
81#define LOG(kind, ...) GNUNET_log_from (kind, "transport-bluetooth", \
82 __VA_ARGS__)
83
84/**
85 * time out of a mac endpoint
86 */
87#define MACENDPOINT_TIMEOUT GNUNET_TIME_relative_multiply ( \
88 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 60)
89
90
91/**
92 * We reduce the frequence of HELLO beacons in relation to
93 * the number of MAC addresses currently visible to us.
94 * This is the multiplication factor.
95 */
96#define HELLO_BEACON_SCALING_FACTOR GNUNET_TIME_relative_multiply ( \
97 GNUNET_TIME_UNIT_SECONDS, 60)
98
99/* end case bluetooth */
100#else
101#error need to build wlan or bluetooth
102#endif
103
104
105/**
106 * Functions with this signature are called whenever a
107 * complete message is received by the tokenizer.
108 *
109 * Do not call #GNUNET_SERVER_mst_destroy from within
110 * the scope of this callback.
111 *
112 * @param cls closure
113 * @param client identification of the client
114 * @param message the actual message
115 * @return #GNUNET_OK on success, #GNUNET_SYSERR to stop further processing
116 */
117typedef int
118(*GNUNET_SERVER_MessageTokenizerCallback) (void *cls,
119 void *client,
120 const struct
121 GNUNET_MessageHeader *message);
122
123
124/* Include legacy message stream tokenizer that was removed from util (for now) */
125#include "tcp_server_mst_legacy.c"
126
127
128/**
129 * Max size of packet (that we give to the WLAN driver for transmission)
130 */
131#define WLAN_MTU 1430
132
133
134/**
135 * Which network scope do we belong to?
136 */
137#if BUILD_WLAN
138static const enum GNUNET_NetworkType scope = GNUNET_NT_WLAN;
139#else
140static const enum GNUNET_NetworkType scope = GNUNET_NT_BT;
141#endif
142
143
144/**
145 * Maximum number of messages in defragmentation queue per MAC
146 */
147#define MESSAGES_IN_DEFRAG_QUEUE_PER_MAC 2
148
149/**
150 * Link layer control fields for better compatibility
151 * (i.e. GNUnet over WLAN is not IP-over-WLAN).
152 */
153#define WLAN_LLC_DSAP_FIELD 0x1f
154#define WLAN_LLC_SSAP_FIELD 0x1f
155
156
157GNUNET_NETWORK_STRUCT_BEGIN
158/**
159 * Header for messages which need fragmentation. This is the format of
160 * a message we obtain AFTER defragmentation. We then need to check
161 * the CRC and then tokenize the payload and pass it to the
162 * 'receive' callback.
163 */
164struct WlanHeader
165{
166 /**
167 * Message type is #GNUNET_MESSAGE_TYPE_WLAN_DATA.
168 */
169 struct GNUNET_MessageHeader header;
170
171 /**
172 * CRC32 checksum (only over the payload), in NBO.
173 */
174 uint32_t crc GNUNET_PACKED;
175
176 /**
177 * Sender of the message.
178 */
179 struct GNUNET_PeerIdentity sender;
180
181 /**
182 * Target of the message.
183 */
184 struct GNUNET_PeerIdentity target;
185
186 /* followed by payload, possibly including
187 multiple messages! */
188};
189
190
191/**
192 * Address format for WLAN.
193 */
194struct WlanAddress
195{
196 /**
197 * Options set for the WLAN, in NBO.
198 */
199 uint32_t options GNUNET_PACKED;
200
201 /**
202 * WLAN addresses using MACs.
203 */
204 struct GNUNET_TRANSPORT_WLAN_MacAddress mac;
205};
206
207
208GNUNET_NETWORK_STRUCT_END
209
210
211/**
212 * Information kept for each message that is yet to be fragmented and
213 * transmitted.
214 */
215struct PendingMessage
216{
217 /**
218 * next entry in the DLL
219 */
220 struct PendingMessage *next;
221
222 /**
223 * previous entry in the DLL
224 */
225 struct PendingMessage *prev;
226
227 /**
228 * The pending message
229 */
230 struct WlanHeader *msg;
231
232 /**
233 * Continuation function to call once the message
234 * has been sent. Can be NULL if there is no
235 * continuation to call.
236 */
237 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
238
239 /**
240 * Cls for @e transmit_cont
241 */
242 void *transmit_cont_cls;
243
244 /**
245 * Timeout task (for this message).
246 */
247 struct GNUNET_SCHEDULER_Task *timeout_task;
248};
249
250
251/**
252 * Session handle for connections with other peers.
253 */
254struct GNUNET_ATS_Session
255{
256 /**
257 * To whom are we talking to (set to our identity
258 * if we are still waiting for the welcome message)
259 */
260 struct GNUNET_PeerIdentity target;
261
262 /**
263 * We keep all sessions in a DLL at their respective
264 * `struct MACEndpoint *`.
265 */
266 struct GNUNET_ATS_Session *next;
267
268 /**
269 * We keep all sessions in a DLL at their respective
270 * `struct MACEndpoint *`.
271 */
272 struct GNUNET_ATS_Session *prev;
273
274 /**
275 * MAC endpoint with the address of this peer.
276 */
277 struct MacEndpoint *mac;
278
279 /**
280 * Address associated with this session and MAC endpoint
281 */
282 struct GNUNET_HELLO_Address *address;
283
284 /**
285 * When should this session time out?
286 */
287 struct GNUNET_TIME_Absolute timeout;
288
289 /**
290 * Timeout task (for the session).
291 */
292 struct GNUNET_SCHEDULER_Task *timeout_task;
293};
294
295
296/**
297 * Struct for messages that are being fragmented in a MAC's transmission queue.
298 */
299struct FragmentMessage
300{
301 /**
302 * This is a doubly-linked list.
303 */
304 struct FragmentMessage *next;
305
306 /**
307 * This is a doubly-linked list.
308 */
309 struct FragmentMessage *prev;
310
311 /**
312 * MAC endpoint this message belongs to
313 */
314 struct MacEndpoint *macendpoint;
315
316 /**
317 * Fragmentation context
318 */
319 struct GNUNET_FRAGMENT_Context *fragcontext;
320
321 /**
322 * Transmission handle to helper (to cancel if the frag context
323 * is destroyed early for some reason).
324 */
325 struct GNUNET_HELPER_SendHandle *sh;
326
327 /**
328 * Intended recipient.
329 */
330 struct GNUNET_PeerIdentity target;
331
332 /**
333 * Timeout value for the message.
334 */
335 struct GNUNET_TIME_Absolute timeout;
336
337 /**
338 * Timeout task.
339 */
340 struct GNUNET_SCHEDULER_Task *timeout_task;
341
342 /**
343 * Continuation to call when we're done with this message.
344 */
345 GNUNET_TRANSPORT_TransmitContinuation cont;
346
347 /**
348 * Message we need to fragment and transmit, NULL after the
349 * @e fragmentcontext has been created.
350 */
351 struct GNUNET_MessageHeader *msg;
352
353 /**
354 * Closure for @e cont
355 */
356 void *cont_cls;
357
358 /**
359 * Size of original message
360 */
361 size_t size_payload;
362
363 /**
364 * Number of bytes used to transmit message
365 */
366 size_t size_on_wire;
367};
368
369
370/**
371 * Struct to represent one network card connection
372 */
373struct MacEndpoint
374{
375 /**
376 * We keep all MACs in a DLL in the plugin.
377 */
378 struct MacEndpoint *next;
379
380 /**
381 * We keep all MACs in a DLL in the plugin.
382 */
383 struct MacEndpoint *prev;
384
385 /**
386 * Pointer to the global plugin struct.
387 */
388 struct Plugin *plugin;
389
390 /**
391 * Head of sessions that use this MAC.
392 */
393 struct GNUNET_ATS_Session *sessions_head;
394
395 /**
396 * Tail of sessions that use this MAC.
397 */
398 struct GNUNET_ATS_Session *sessions_tail;
399
400 /**
401 * Head of messages we are currently sending to this MAC.
402 */
403 struct FragmentMessage *sending_messages_head;
404
405 /**
406 * Tail of messages we are currently sending to this MAC.
407 */
408 struct FragmentMessage *sending_messages_tail;
409
410 /**
411 * Defrag context for this MAC
412 */
413 struct GNUNET_DEFRAGMENT_Context *defrag;
414
415 /**
416 * When should this endpoint time out?
417 */
418 struct GNUNET_TIME_Absolute timeout;
419
420 /**
421 * Timeout task.
422 */
423 struct GNUNET_SCHEDULER_Task *timeout_task;
424
425 /**
426 * count of messages in the fragment out queue for this mac endpoint
427 */
428 unsigned int fragment_messages_out_count;
429
430 /**
431 * peer MAC address
432 */
433 struct WlanAddress wlan_addr;
434
435 /**
436 * Message delay for fragmentation context
437 */
438 struct GNUNET_TIME_Relative msg_delay;
439
440 /**
441 * ACK delay for fragmentation context
442 */
443 struct GNUNET_TIME_Relative ack_delay;
444
445 /**
446 * Desired transmission power for this MAC
447 */
448 uint16_t tx_power;
449
450 /**
451 * Desired transmission rate for this MAC
452 */
453 uint8_t rate;
454
455 /**
456 * Antenna we should use for this MAC
457 */
458 uint8_t antenna;
459};
460
461
462/**
463 * Encapsulation of all of the state of the plugin.
464 */
465struct Plugin
466{
467 /**
468 * Our environment.
469 */
470 struct GNUNET_TRANSPORT_PluginEnvironment *env;
471
472 /**
473 * Handle to helper process for privileged operations.
474 */
475 struct GNUNET_HELPER_Handle *suid_helper;
476
477 /**
478 * Function to call about session status changes.
479 */
480 GNUNET_TRANSPORT_SessionInfoCallback sic;
481
482 /**
483 * Closure for @e sic.
484 */
485 void *sic_cls;
486
487 /**
488 * ARGV-vector for the helper (all helpers take only the binary
489 * name, one actual argument, plus the NULL terminator for 'argv').
490 */
491 char *helper_argv[3];
492
493 /**
494 * The interface of the wlan card given to us by the user.
495 */
496 char *wlan_interface;
497
498 /**
499 * Tokenizer for demultiplexing of data packets resulting from
500 * defragmentation.
501 */
502 struct GNUNET_SERVER_MessageStreamTokenizer *fragment_data_tokenizer;
503
504 /**
505 * Tokenizer for demultiplexing of data packets received from the suid helper
506 */
507 struct GNUNET_SERVER_MessageStreamTokenizer *helper_payload_tokenizer;
508
509 /**
510 * Tokenizer for demultiplexing of data packets that follow the WLAN Header
511 */
512 struct GNUNET_SERVER_MessageStreamTokenizer *wlan_header_payload_tokenizer;
513
514 /**
515 * Head of list of open connections.
516 */
517 struct MacEndpoint *mac_head;
518
519 /**
520 * Tail of list of open connections.
521 */
522 struct MacEndpoint *mac_tail;
523
524 /**
525 * Task that periodically sends a HELLO beacon via the helper.
526 */
527 struct GNUNET_SCHEDULER_Task *beacon_task;
528
529 /**
530 * Tracker for bandwidth limit
531 */
532 struct GNUNET_BANDWIDTH_Tracker tracker;
533
534 /**
535 * The mac_address of the wlan card given to us by the helper.
536 */
537 struct GNUNET_TRANSPORT_WLAN_MacAddress mac_address;
538
539 /**
540 * Have we received a control message with our MAC address yet?
541 */
542 int have_mac;
543
544 /**
545 * Number of connections
546 */
547 unsigned int mac_count;
548
549 /**
550 * Options for addresses
551 */
552 uint32_t options;
553};
554
555
556/**
557 * Information associated with a message. Can contain
558 * the session or the MAC endpoint associated with the
559 * message (or both).
560 */
561struct MacAndSession
562{
563 /**
564 * NULL if the identity of the other peer is not known.
565 */
566 struct GNUNET_ATS_Session *session;
567
568 /**
569 * MAC address of the other peer, NULL if not known.
570 */
571 struct MacEndpoint *endpoint;
572};
573
574
575/**
576 * Print MAC addresses nicely.
577 *
578 * @param mac the mac address
579 * @return string to a static buffer with
580 * the human-readable mac, will be overwritten during the next call to
581 * this function
582 */
583static const char *
584mac_to_string (const struct GNUNET_TRANSPORT_WLAN_MacAddress *mac)
585{
586 static char macstr[20];
587
588 GNUNET_snprintf (macstr,
589 sizeof(macstr),
590 "%.2X:%.2X:%.2X:%.2X:%.2X:%.2X",
591 mac->mac[0], mac->mac[1],
592 mac->mac[2], mac->mac[3],
593 mac->mac[4], mac->mac[5]);
594 return macstr;
595}
596
597
598/**
599 * Function called for a quick conversion of the binary address to
600 * a numeric address. Note that the caller must not free the
601 * address and that the next call to this function is allowed
602 * to override the address again.
603 *
604 * @param cls closure
605 * @param addr binary address
606 * @param addrlen length of the address
607 * @return string representing the same address
608 */
609static const char *
610wlan_plugin_address_to_string (void *cls,
611 const void *addr,
612 size_t addrlen)
613{
614 const struct GNUNET_TRANSPORT_WLAN_MacAddress *mac;
615 static char macstr[36];
616
617 if (sizeof(struct WlanAddress) != addrlen)
618 {
619 GNUNET_break (0);
620 return NULL;
621 }
622 mac = &((struct WlanAddress *) addr)->mac;
623 GNUNET_snprintf (macstr,
624 sizeof(macstr),
625 "%s.%u.%s",
626 PLUGIN_NAME,
627 ntohl (((struct WlanAddress *) addr)->options),
628 mac_to_string (mac));
629 return macstr;
630}
631
632
633/**
634 * If a session monitor is attached, notify it about the new
635 * session state.
636 *
637 * @param plugin our plugin
638 * @param session session that changed state
639 * @param state new state of the session
640 */
641static void
642notify_session_monitor (struct Plugin *plugin,
643 struct GNUNET_ATS_Session *session,
644 enum GNUNET_TRANSPORT_SessionState state)
645{
646 struct GNUNET_TRANSPORT_SessionInfo info;
647
648 if (NULL == plugin->sic)
649 return;
650 memset (&info, 0, sizeof(info));
651 info.state = state;
652 info.is_inbound = GNUNET_SYSERR; /* hard to say */
653 info.num_msg_pending = 0; /* we queue per MAC, not per peer */
654 info.num_bytes_pending = 0; /* we queue per MAC, not per peer */
655 info.receive_delay = GNUNET_TIME_UNIT_ZERO_ABS; /* not supported by WLAN */
656 info.session_timeout = session->timeout;
657 info.address = session->address;
658 plugin->sic (plugin->sic_cls,
659 session,
660 &info);
661}
662
663
664/**
665 * Fill the radiotap header
666 *
667 * @param endpoint pointer to the endpoint, can be NULL
668 * @param header pointer to the radiotap header
669 * @param size total message size
670 */
671static void
672get_radiotap_header (struct MacEndpoint *endpoint,
673 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *header,
674 uint16_t size)
675{
676 header->header.type = ntohs (GNUNET_MESSAGE_TYPE_WLAN_DATA_TO_HELPER);
677 header->header.size = ntohs (size);
678 if (NULL != endpoint)
679 {
680 header->rate = endpoint->rate;
681 header->tx_power = endpoint->tx_power;
682 header->antenna = endpoint->antenna;
683 }
684 else
685 {
686 header->rate = 255;
687 header->tx_power = 0;
688 header->antenna = 0;
689 }
690}
691
692
693/**
694 * Generate the WLAN hardware header for one packet
695 *
696 * @param plugin the plugin handle
697 * @param header address to write the header to
698 * @param to_mac_addr address of the recipient
699 * @param size size of the whole packet, needed to calculate the time to send the packet
700 */
701static void
702get_wlan_header (struct Plugin *plugin,
703 struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame *header,
704 const struct GNUNET_TRANSPORT_WLAN_MacAddress *to_mac_addr,
705 unsigned int size)
706{
707 const int rate = 11000000;
708
709 header->frame_control = htons (IEEE80211_FC0_TYPE_DATA);
710 header->addr1 = *to_mac_addr;
711 header->addr2 = plugin->mac_address;
712 header->addr3 = mac_bssid_gnunet;
713 header->duration = GNUNET_htole16 ((size * 1000000) / rate + 290);
714 header->sequence_control = 0; // FIXME?
715 header->llc[0] = WLAN_LLC_DSAP_FIELD;
716 header->llc[1] = WLAN_LLC_SSAP_FIELD;
717 header->llc[2] = 0; // FIXME?
718 header->llc[3] = 0; // FIXME?
719}
720
721
722/**
723 * Send an ACK for a fragment we received.
724 *
725 * @param cls the `struct MacEndpoint *` the ACK must be sent to
726 * @param msg_id id of the message
727 * @param hdr pointer to the hdr where the ack is stored
728 */
729static void
730send_ack (void *cls,
731 uint32_t msg_id,
732 const struct GNUNET_MessageHeader *hdr)
733{
734 struct MacEndpoint *endpoint = cls;
735 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage*radio_header;
736 uint16_t msize = ntohs (hdr->size);
737 size_t size = sizeof(struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage)
738 + msize;
739 char buf[size];
740
741 if (NULL == endpoint)
742 {
743 GNUNET_break (0);
744 return;
745 }
746 if (size >= GNUNET_MAX_MESSAGE_SIZE)
747 {
748 GNUNET_break (0);
749 return;
750 }
751 LOG (GNUNET_ERROR_TYPE_DEBUG,
752 "Sending ACK to %s\n",
753 mac_to_string (&endpoint->wlan_addr.mac));
754 radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
755 get_radiotap_header (endpoint, radio_header, size);
756 get_wlan_header (endpoint->plugin,
757 &radio_header->frame,
758 &endpoint->wlan_addr.mac,
759 sizeof(endpoint->wlan_addr.mac));
760 GNUNET_memcpy (&radio_header[1], hdr, msize);
761 if (NULL !=
762 GNUNET_HELPER_send (endpoint->plugin->suid_helper,
763 &radio_header->header,
764 GNUNET_NO /* dropping ACKs is bad */,
765 NULL, NULL))
766 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
767 _ ("# ACKs sent"),
768 1, GNUNET_NO);
769}
770
771
772/**
773 * Handles the data after all fragments are put together
774 *
775 * @param cls macendpoint this messages belongs to
776 * @param hdr pointer to the data
777 */
778static void
779wlan_data_message_handler (void *cls,
780 const struct GNUNET_MessageHeader *hdr)
781{
782 struct MacEndpoint *endpoint = cls;
783 struct Plugin *plugin = endpoint->plugin;
784 struct MacAndSession mas;
785
786 GNUNET_STATISTICS_update (plugin->env->stats,
787 _ ("# Messages defragmented"),
788 1,
789 GNUNET_NO);
790 mas.session = NULL;
791 mas.endpoint = endpoint;
792 (void) GNUNET_SERVER_mst_receive (plugin->fragment_data_tokenizer,
793 &mas,
794 (const char *) hdr,
795 ntohs (hdr->size),
796 GNUNET_YES, GNUNET_NO);
797}
798
799
800/**
801 * Free a session
802 *
803 * @param cls our `struct Plugin`.
804 * @param session the session free
805 */
806static int
807wlan_plugin_disconnect_session (void *cls,
808 struct GNUNET_ATS_Session *session)
809{
810 struct MacEndpoint *endpoint = session->mac;
811 struct Plugin *plugin = endpoint->plugin;
812
813 plugin->env->session_end (plugin->env->cls,
814 session->address,
815 session);
816 notify_session_monitor (plugin,
817 session,
818 GNUNET_TRANSPORT_SS_DONE);
819 GNUNET_CONTAINER_DLL_remove (endpoint->sessions_head,
820 endpoint->sessions_tail,
821 session);
822 if (session->timeout_task != NULL)
823 {
824 GNUNET_SCHEDULER_cancel (session->timeout_task);
825 session->timeout_task = NULL;
826 }
827 GNUNET_STATISTICS_update (plugin->env->stats,
828 _ ("# Sessions allocated"),
829 -1,
830 GNUNET_NO);
831 GNUNET_HELLO_address_free (session->address);
832 GNUNET_free (session);
833 return GNUNET_OK;
834}
835
836
837/**
838 * Function that is called to get the keepalive factor.
839 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
840 * calculate the interval between keepalive packets.
841 *
842 * @param cls closure with the `struct Plugin`
843 * @return keepalive factor
844 */
845static unsigned int
846wlan_plugin_query_keepalive_factor (void *cls)
847{
848 return 3;
849}
850
851
852/**
853 * A session is timing out. Clean up.
854 *
855 * @param cls pointer to the Session
856 */
857static void
858session_timeout (void *cls)
859{
860 struct GNUNET_ATS_Session *session = cls;
861 struct GNUNET_TIME_Relative left;
862
863 session->timeout_task = NULL;
864 left = GNUNET_TIME_absolute_get_remaining (session->timeout);
865 if (0 != left.rel_value_us)
866 {
867 session->timeout_task =
868 GNUNET_SCHEDULER_add_delayed (left,
869 &session_timeout,
870 session);
871 return;
872 }
873 wlan_plugin_disconnect_session (session->mac->plugin,
874 session);
875}
876
877
878/**
879 * Lookup a new session
880 *
881 * @param endpoint pointer to the mac endpoint of the peer
882 * @param peer peer identity to use for this session
883 * @return returns the session or NULL
884 */
885static struct GNUNET_ATS_Session *
886lookup_session (struct MacEndpoint *endpoint,
887 const struct GNUNET_PeerIdentity *peer)
888{
889 struct GNUNET_ATS_Session *session;
890
891 for (session = endpoint->sessions_head; NULL != session; session =
892 session->next)
893 if (0 == memcmp (peer, &session->target, sizeof(struct
894 GNUNET_PeerIdentity)))
895 return session;
896 return NULL;
897}
898
899
900/**
901 * Create a new session
902 *
903 * @param endpoint pointer to the mac endpoint of the peer
904 * @param peer peer identity to use for this session
905 * @return returns the session or NULL
906 */
907static struct GNUNET_ATS_Session *
908create_session (struct MacEndpoint *endpoint,
909 const struct GNUNET_PeerIdentity *peer)
910{
911 struct GNUNET_ATS_Session *session;
912
913 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
914 _ ("# Sessions allocated"),
915 1,
916 GNUNET_NO);
917 session = GNUNET_new (struct GNUNET_ATS_Session);
918 GNUNET_CONTAINER_DLL_insert_tail (endpoint->sessions_head,
919 endpoint->sessions_tail,
920 session);
921 session->address = GNUNET_HELLO_address_allocate (peer,
922 PLUGIN_NAME,
923 &endpoint->wlan_addr,
924 sizeof(endpoint->wlan_addr),
925 GNUNET_HELLO_ADDRESS_INFO_NONE);
926 session->mac = endpoint;
927 session->target = *peer;
928 session->timeout = GNUNET_TIME_relative_to_absolute (
929 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
930 session->timeout_task =
931 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
932 &session_timeout,
933 session);
934 notify_session_monitor (endpoint->plugin,
935 session,
936 GNUNET_TRANSPORT_SS_INIT);
937 notify_session_monitor (endpoint->plugin,
938 session,
939 GNUNET_TRANSPORT_SS_UP);
940 LOG (GNUNET_ERROR_TYPE_DEBUG,
941 "Created new session %p for peer `%s' with endpoint %s\n",
942 session,
943 GNUNET_i2s (peer),
944 mac_to_string (&endpoint->wlan_addr.mac));
945
946 return session;
947}
948
949
950/**
951 * Look up a session for a peer and create a new session if none is found
952 *
953 * @param endpoint pointer to the mac endpoint of the peer
954 * @param peer peer identity to use for this session
955 * @return returns the session
956 */
957static struct GNUNET_ATS_Session *
958get_session (struct MacEndpoint *endpoint,
959 const struct GNUNET_PeerIdentity *peer)
960{
961 struct GNUNET_ATS_Session *session;
962
963 if (NULL != (session = lookup_session (endpoint, peer)))
964 return session;
965 return create_session (endpoint, peer);
966}
967
968
969/**
970 * Function called once we have successfully given the fragment
971 * message to the SUID helper process and we are thus ready for
972 * the next fragment.
973 *
974 * @param cls the `struct FragmentMessage *`
975 * @param result result of the operation (#GNUNET_OK on success,
976 * #GNUNET_NO if the helper died, #GNUNET_SYSERR
977 * if the helper was stopped)
978 */
979static void
980fragment_transmission_done (void *cls,
981 int result)
982{
983 struct FragmentMessage *fm = cls;
984
985 fm->sh = NULL;
986 GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
987}
988
989
990/**
991 * Transmit a fragment of a message.
992 *
993 * @param cls `struct FragmentMessage *` this fragment message belongs to
994 * @param hdr pointer to the start of the fragment message
995 */
996static void
997transmit_fragment (void *cls,
998 const struct GNUNET_MessageHeader *hdr)
999{
1000 struct FragmentMessage *fm = cls;
1001 struct MacEndpoint *endpoint = fm->macendpoint;
1002 size_t size;
1003 uint16_t msize;
1004
1005 if (NULL == endpoint)
1006 {
1007 GNUNET_break (0);
1008 return;
1009 }
1010 msize = ntohs (hdr->size);
1011 size = sizeof(struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + msize;
1012 {
1013 char buf[size];
1014 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radio_header;
1015
1016 radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
1017 get_radiotap_header (endpoint, radio_header, size);
1018 LOG (GNUNET_ERROR_TYPE_DEBUG,
1019 "Sending %u bytes of data to MAC `%s'\n",
1020 (unsigned int) msize,
1021 mac_to_string (&endpoint->wlan_addr.mac));
1022
1023 get_wlan_header (endpoint->plugin,
1024 &radio_header->frame,
1025 &endpoint->wlan_addr.mac,
1026 sizeof(endpoint->wlan_addr.mac));
1027 GNUNET_memcpy (&radio_header[1], hdr, msize);
1028 GNUNET_assert (NULL == fm->sh);
1029 fm->sh = GNUNET_HELPER_send (endpoint->plugin->suid_helper,
1030 &radio_header->header,
1031 GNUNET_NO,
1032 &fragment_transmission_done, fm);
1033 fm->size_on_wire += size;
1034 if (NULL != fm->sh)
1035 {
1036 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
1037 _ ("# message fragments sent"),
1038 1,
1039 GNUNET_NO);
1040 }
1041 else
1042 {
1043 GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
1044 }
1045 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
1046 "# bytes currently in buffers",
1047 -msize, GNUNET_NO);
1048 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
1049 "# bytes transmitted",
1050 msize, GNUNET_NO);
1051 }
1052}
1053
1054
1055/**
1056 * Frees the space of a message in the fragment queue (send queue)
1057 *
1058 * @param fm message to free
1059 */
1060static void
1061free_fragment_message (struct FragmentMessage *fm)
1062{
1063 struct MacEndpoint *endpoint = fm->macendpoint;
1064
1065 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
1066 _ ("# messages pending (with fragmentation)"),
1067 -1, GNUNET_NO);
1068 GNUNET_CONTAINER_DLL_remove (endpoint->sending_messages_head,
1069 endpoint->sending_messages_tail,
1070 fm);
1071 if (NULL != fm->sh)
1072 {
1073 GNUNET_HELPER_send_cancel (fm->sh);
1074 fm->sh = NULL;
1075 }
1076 if (NULL != fm->msg)
1077 {
1078 GNUNET_free (fm->msg);
1079 fm->msg = NULL;
1080 }
1081 if (NULL != fm->fragcontext)
1082 {
1083 GNUNET_FRAGMENT_context_destroy (fm->fragcontext,
1084 &endpoint->msg_delay,
1085 &endpoint->ack_delay);
1086 fm->fragcontext = NULL;
1087 }
1088 if (NULL != fm->timeout_task)
1089 {
1090 GNUNET_SCHEDULER_cancel (fm->timeout_task);
1091 fm->timeout_task = NULL;
1092 }
1093 GNUNET_free (fm);
1094}
1095
1096
1097/**
1098 * A FragmentMessage has timed out. Remove it.
1099 *
1100 * @param cls pointer to the 'struct FragmentMessage'
1101 */
1102static void
1103fragmentmessage_timeout (void *cls)
1104{
1105 struct FragmentMessage *fm = cls;
1106
1107 fm->timeout_task = NULL;
1108 if (NULL != fm->cont)
1109 {
1110 fm->cont (fm->cont_cls,
1111 &fm->target,
1112 GNUNET_SYSERR,
1113 fm->size_payload,
1114 fm->size_on_wire);
1115 fm->cont = NULL;
1116 }
1117 free_fragment_message (fm);
1118}
1119
1120
1121/**
1122 * Transmit a message to the given destination with fragmentation.
1123 *
1124 * @param endpoint desired destination
1125 * @param timeout how long can the message wait?
1126 * @param target peer that should receive the message
1127 * @param msg message to transmit
1128 * @param payload_size bytes of payload
1129 * @param cont continuation to call once the message has
1130 * been transmitted (or if the transport is ready
1131 * for the next transmission call; or if the
1132 * peer disconnected...); can be NULL
1133 * @param cont_cls closure for @a cont
1134 */
1135static void
1136send_with_fragmentation (struct MacEndpoint *endpoint,
1137 struct GNUNET_TIME_Relative timeout,
1138 const struct GNUNET_PeerIdentity *target,
1139 const struct GNUNET_MessageHeader *msg,
1140 size_t payload_size,
1141 GNUNET_TRANSPORT_TransmitContinuation cont,
1142 void *cont_cls)
1143
1144{
1145 struct FragmentMessage *fm;
1146 struct Plugin *plugin;
1147
1148 plugin = endpoint->plugin;
1149 fm = GNUNET_new (struct FragmentMessage);
1150 fm->macendpoint = endpoint;
1151 fm->target = *target;
1152 fm->size_payload = payload_size;
1153 fm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1154 fm->cont = cont;
1155 fm->cont_cls = cont_cls;
1156 /* 1 MBit/s typical data rate, 1430 byte fragments => ~100 ms per message */
1157 fm->timeout_task =
1158 GNUNET_SCHEDULER_add_delayed (timeout,
1159 &fragmentmessage_timeout,
1160 fm);
1161 if (GNUNET_YES == plugin->have_mac)
1162 {
1163 fm->fragcontext =
1164 GNUNET_FRAGMENT_context_create (plugin->env->stats,
1165 WLAN_MTU,
1166 &plugin->tracker,
1167 fm->macendpoint->msg_delay,
1168 fm->macendpoint->ack_delay,
1169 msg,
1170 &transmit_fragment, fm);
1171 }
1172 else
1173 {
1174 fm->msg = GNUNET_copy_message (msg);
1175 }
1176 GNUNET_CONTAINER_DLL_insert_tail (endpoint->sending_messages_head,
1177 endpoint->sending_messages_tail,
1178 fm);
1179}
1180
1181
1182/**
1183 * Free a MAC endpoint.
1184 *
1185 * @param endpoint pointer to the MacEndpoint to free
1186 */
1187static void
1188free_macendpoint (struct MacEndpoint *endpoint)
1189{
1190 struct Plugin *plugin = endpoint->plugin;
1191 struct FragmentMessage *fm;
1192 struct GNUNET_ATS_Session *session;
1193
1194 GNUNET_STATISTICS_update (plugin->env->stats,
1195 _ ("# MAC endpoints allocated"),
1196 -1,
1197 GNUNET_NO);
1198 while (NULL != (session = endpoint->sessions_head))
1199 wlan_plugin_disconnect_session (plugin,
1200 session);
1201 while (NULL != (fm = endpoint->sending_messages_head))
1202 free_fragment_message (fm);
1203 GNUNET_CONTAINER_DLL_remove (plugin->mac_head,
1204 plugin->mac_tail,
1205 endpoint);
1206
1207 if (NULL != endpoint->defrag)
1208 {
1209 GNUNET_DEFRAGMENT_context_destroy (endpoint->defrag);
1210 endpoint->defrag = NULL;
1211 }
1212
1213 plugin->mac_count--;
1214 if (NULL != endpoint->timeout_task)
1215 {
1216 GNUNET_SCHEDULER_cancel (endpoint->timeout_task);
1217 endpoint->timeout_task = NULL;
1218 }
1219 GNUNET_free (endpoint);
1220}
1221
1222
1223/**
1224 * A MAC endpoint is timing out. Clean up.
1225 *
1226 * @param cls pointer to the `struct MacEndpoint *`
1227 */
1228static void
1229macendpoint_timeout (void *cls)
1230{
1231 struct MacEndpoint *endpoint = cls;
1232 struct GNUNET_TIME_Relative timeout;
1233
1234 endpoint->timeout_task = NULL;
1235 timeout = GNUNET_TIME_absolute_get_remaining (endpoint->timeout);
1236 if (0 == timeout.rel_value_us)
1237 {
1238 free_macendpoint (endpoint);
1239 return;
1240 }
1241 endpoint->timeout_task =
1242 GNUNET_SCHEDULER_add_delayed (timeout,
1243 &macendpoint_timeout,
1244 endpoint);
1245}
1246
1247
1248/**
1249 * Find (or create) a MacEndpoint with a specific MAC address
1250 *
1251 * @param plugin pointer to the plugin struct
1252 * @param mac the MAC address of the endpoint
1253 * @return handle to our data structure for this MAC
1254 */
1255static struct MacEndpoint *
1256create_macendpoint (struct Plugin *plugin,
1257 struct WlanAddress *mac)
1258{
1259 struct MacEndpoint *pos;
1260
1261 for (pos = plugin->mac_head; NULL != pos; pos = pos->next)
1262 if (0 == memcmp (mac, &pos->wlan_addr, sizeof(pos->wlan_addr)))
1263 return pos;
1264 pos = GNUNET_new (struct MacEndpoint);
1265 pos->wlan_addr = (*mac);
1266 pos->plugin = plugin;
1267 pos->defrag =
1268 GNUNET_DEFRAGMENT_context_create (plugin->env->stats,
1269 WLAN_MTU,
1270 MESSAGES_IN_DEFRAG_QUEUE_PER_MAC,
1271 pos,
1272 &wlan_data_message_handler,
1273 &send_ack);
1274
1275 pos->msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
1276 pos->ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1277 100);
1278 pos->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
1279 pos->timeout_task =
1280 GNUNET_SCHEDULER_add_delayed (MACENDPOINT_TIMEOUT, &macendpoint_timeout,
1281 pos);
1282 GNUNET_CONTAINER_DLL_insert (plugin->mac_head,
1283 plugin->mac_tail,
1284 pos);
1285 plugin->mac_count++;
1286 GNUNET_STATISTICS_update (plugin->env->stats,
1287 _ ("# MAC endpoints allocated"),
1288 1, GNUNET_NO);
1289 LOG (GNUNET_ERROR_TYPE_DEBUG,
1290 "New MAC endpoint `%s'\n",
1291 wlan_plugin_address_to_string (NULL,
1292 &pos->wlan_addr,
1293 sizeof(struct WlanAddress)));
1294 return pos;
1295}
1296
1297
1298/**
1299 * Function obtain the network type for a session
1300 *
1301 * @param cls closure (`struct Plugin*`)
1302 * @param session the session
1303 * @return the network type in HBO or #GNUNET_SYSERR
1304 */
1305static enum GNUNET_NetworkType
1306wlan_plugin_get_network (void *cls,
1307 struct GNUNET_ATS_Session *session)
1308{
1309#if BUILD_WLAN
1310 return GNUNET_NT_WLAN;
1311#else
1312 return GNUNET_NT_BT;
1313#endif
1314}
1315
1316
1317/**
1318 * Function obtain the network type for an address.
1319 *
1320 * @param cls closure (`struct Plugin *`)
1321 * @param address the address
1322 * @return the network type
1323 */
1324static enum GNUNET_NetworkType
1325wlan_plugin_get_network_for_address (void *cls,
1326 const struct GNUNET_HELLO_Address *address)
1327{
1328#if BUILD_WLAN
1329 return GNUNET_NT_WLAN;
1330#else
1331 return GNUNET_NT_BT;
1332#endif
1333}
1334
1335
1336/**
1337 * Creates a new outbound session the transport service will use to
1338 * send data to the peer
1339 *
1340 * @param cls the `struct Plugin *`
1341 * @param address the address
1342 * @return the session or NULL of max connections exceeded
1343 */
1344static struct GNUNET_ATS_Session *
1345wlan_plugin_get_session (void *cls,
1346 const struct GNUNET_HELLO_Address *address)
1347{
1348 struct Plugin *plugin = cls;
1349 struct MacEndpoint *endpoint;
1350
1351 if (NULL == address)
1352 return NULL;
1353 if (sizeof(struct WlanAddress) != address->address_length)
1354 {
1355 GNUNET_break (0);
1356 return NULL;
1357 }
1358 LOG (GNUNET_ERROR_TYPE_DEBUG,
1359 "Service asked to create session for peer `%s' with MAC `%s'\n",
1360 GNUNET_i2s (&address->peer),
1361 wlan_plugin_address_to_string (NULL,
1362 address->address,
1363 address->address_length));
1364 endpoint = create_macendpoint (plugin,
1365 (struct WlanAddress *) address->address);
1366 return get_session (endpoint, &address->peer);
1367}
1368
1369
1370/**
1371 * Function that can be used to force the plugin to disconnect
1372 * from the given peer and cancel all previous transmissions
1373 * (and their continuation).
1374 *
1375 * @param cls closure
1376 * @param target peer from which to disconnect
1377 */
1378static void
1379wlan_plugin_disconnect_peer (void *cls,
1380 const struct GNUNET_PeerIdentity *target)
1381{
1382 struct Plugin *plugin = cls;
1383 struct GNUNET_ATS_Session *session;
1384 struct MacEndpoint *endpoint;
1385
1386 for (endpoint = plugin->mac_head; NULL != endpoint; endpoint = endpoint->next)
1387 for (session = endpoint->sessions_head; NULL != session; session =
1388 session->next)
1389 if (0 == memcmp (target, &session->target,
1390 sizeof(struct GNUNET_PeerIdentity)))
1391 {
1392 wlan_plugin_disconnect_session (plugin, session);
1393 break; /* inner-loop only (in case peer has another MAC as well!) */
1394 }
1395}
1396
1397
1398/**
1399 * Function that can be used by the transport service to transmit
1400 * a message using the plugin. Note that in the case of a
1401 * peer disconnecting, the continuation MUST be called
1402 * prior to the disconnect notification itself. This function
1403 * will be called with this peer's HELLO message to initiate
1404 * a fresh connection to another peer.
1405 *
1406 * @param cls closure
1407 * @param session which session must be used
1408 * @param msgbuf the message to transmit
1409 * @param msgbuf_size number of bytes in @a msgbuf
1410 * @param priority how important is the message (most plugins will
1411 * ignore message priority and just FIFO)
1412 * @param to how long to wait at most for the transmission (does not
1413 * require plugins to discard the message after the timeout,
1414 * just advisory for the desired delay; most plugins will ignore
1415 * this as well)
1416 * @param cont continuation to call once the message has
1417 * been transmitted (or if the transport is ready
1418 * for the next transmission call; or if the
1419 * peer disconnected...); can be NULL
1420 * @param cont_cls closure for @a cont
1421 * @return number of bytes used (on the physical network, with overheads);
1422 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1423 * and does NOT mean that the message was not transmitted (DV)
1424 */
1425static ssize_t
1426wlan_plugin_send (void *cls,
1427 struct GNUNET_ATS_Session *session,
1428 const char *msgbuf, size_t msgbuf_size,
1429 unsigned int priority,
1430 struct GNUNET_TIME_Relative to,
1431 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1432{
1433 struct Plugin *plugin = cls;
1434 struct WlanHeader *wlanheader;
1435 size_t size = msgbuf_size + sizeof(struct WlanHeader);
1436 char buf[size] GNUNET_ALIGN;
1437
1438 LOG (GNUNET_ERROR_TYPE_DEBUG,
1439 "Transmitting %llu bytes of payload to peer `%s' (starting with %u byte message of type %u)\n",
1440 (unsigned long long) msgbuf_size,
1441 GNUNET_i2s (&session->target),
1442 (unsigned int) ntohs (((struct GNUNET_MessageHeader*) msgbuf)->size),
1443 (unsigned int) ntohs (((struct GNUNET_MessageHeader*) msgbuf)->type));
1444 wlanheader = (struct WlanHeader *) buf;
1445 wlanheader->header.size = htons (msgbuf_size + sizeof(struct WlanHeader));
1446 wlanheader->header.type = htons (GNUNET_MESSAGE_TYPE_WLAN_DATA);
1447 wlanheader->sender = *plugin->env->my_identity;
1448 wlanheader->target = session->target;
1449 wlanheader->crc = htonl (GNUNET_CRYPTO_crc32_n (msgbuf, msgbuf_size));
1450 GNUNET_memcpy (&wlanheader[1],
1451 msgbuf,
1452 msgbuf_size);
1453 GNUNET_STATISTICS_update (plugin->env->stats,
1454 "# bytes currently in buffers",
1455 msgbuf_size,
1456 GNUNET_NO);
1457 send_with_fragmentation (session->mac,
1458 to,
1459 &session->target,
1460 &wlanheader->header,
1461 msgbuf_size,
1462 cont, cont_cls);
1463 return size;
1464}
1465
1466
1467/**
1468 * We have received data from the WLAN via some session. Process depending
1469 * on the message type (HELLO, DATA, FRAGMENTATION or FRAGMENTATION-ACK).
1470 *
1471 * @param cls pointer to the plugin
1472 * @param client pointer to the session this message belongs to
1473 * @param hdr start of the message
1474 */
1475static int
1476process_data (void *cls,
1477 void *client,
1478 const struct GNUNET_MessageHeader *hdr)
1479{
1480 struct Plugin *plugin = cls;
1481 struct GNUNET_HELLO_Address *address;
1482 struct MacAndSession *mas = client;
1483 struct FragmentMessage *fm;
1484 struct GNUNET_PeerIdentity tmpsource;
1485 const struct WlanHeader *wlanheader;
1486 int ret;
1487 uint16_t msize;
1488
1489 msize = ntohs (hdr->size);
1490
1491 GNUNET_STATISTICS_update (plugin->env->stats,
1492 "# bytes received",
1493 msize, GNUNET_NO);
1494
1495 switch (ntohs (hdr->type))
1496 {
1497 case GNUNET_MESSAGE_TYPE_HELLO:
1498
1499 if (GNUNET_OK !=
1500 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hdr,
1501 &tmpsource))
1502 {
1503 GNUNET_break_op (0);
1504 break;
1505 }
1506 if (NULL == mas->endpoint)
1507 {
1508 GNUNET_break (0);
1509 break;
1510 }
1511
1512 LOG (GNUNET_ERROR_TYPE_DEBUG,
1513 "Processing %u bytes of HELLO from peer `%s' at MAC %s\n",
1514 (unsigned int) msize,
1515 GNUNET_i2s (&tmpsource),
1516 wlan_plugin_address_to_string (NULL,
1517 &mas->endpoint->wlan_addr,
1518 sizeof(mas->endpoint->wlan_addr)));
1519
1520 GNUNET_STATISTICS_update (plugin->env->stats,
1521 _ ("# HELLO messages received"), 1,
1522 GNUNET_NO);
1523 address = GNUNET_HELLO_address_allocate (&tmpsource,
1524 PLUGIN_NAME,
1525 &mas->endpoint->wlan_addr,
1526 sizeof(mas->endpoint->wlan_addr),
1527 GNUNET_HELLO_ADDRESS_INFO_NONE);
1528 mas->session = lookup_session (mas->endpoint,
1529 &tmpsource);
1530 if (NULL == mas->session)
1531 {
1532 mas->session = create_session (mas->endpoint,
1533 &tmpsource);
1534 plugin->env->session_start (plugin->env->cls,
1535 address,
1536 mas->session,
1537 scope);
1538 }
1539 plugin->env->receive (plugin->env->cls,
1540 address,
1541 mas->session,
1542 hdr);
1543 GNUNET_HELLO_address_free (address);
1544 break;
1545
1546 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1547 if (NULL == mas->endpoint)
1548 {
1549 GNUNET_break (0);
1550 break;
1551 }
1552 LOG (GNUNET_ERROR_TYPE_DEBUG,
1553 "Processing %u bytes of FRAGMENT from MAC %s\n",
1554 (unsigned int) msize,
1555 wlan_plugin_address_to_string (NULL,
1556 &mas->endpoint->wlan_addr,
1557 sizeof(mas->endpoint->wlan_addr)));
1558 GNUNET_STATISTICS_update (plugin->env->stats,
1559 _ ("# fragments received"),
1560 1,
1561 GNUNET_NO);
1562 (void) GNUNET_DEFRAGMENT_process_fragment (mas->endpoint->defrag,
1563 hdr);
1564 break;
1565
1566 case GNUNET_MESSAGE_TYPE_FRAGMENT_ACK:
1567 if (NULL == mas->endpoint)
1568 {
1569 GNUNET_break (0);
1570 break;
1571 }
1572 GNUNET_STATISTICS_update (plugin->env->stats,
1573 _ ("# ACKs received"),
1574 1, GNUNET_NO);
1575 for (fm = mas->endpoint->sending_messages_head; NULL != fm; fm = fm->next)
1576 {
1577 ret = GNUNET_FRAGMENT_process_ack (fm->fragcontext, hdr);
1578 if (GNUNET_OK == ret)
1579 {
1580 LOG (GNUNET_ERROR_TYPE_DEBUG,
1581 "Got last ACK, finished message transmission to `%s' (%p)\n",
1582 wlan_plugin_address_to_string (NULL,
1583 &mas->endpoint->wlan_addr,
1584 sizeof(mas->endpoint->wlan_addr)),
1585 fm);
1586 mas->endpoint->timeout = GNUNET_TIME_relative_to_absolute (
1587 MACENDPOINT_TIMEOUT);
1588 if (NULL != fm->cont)
1589 {
1590 fm->cont (fm->cont_cls,
1591 &fm->target,
1592 GNUNET_OK,
1593 fm->size_payload,
1594 fm->size_on_wire);
1595 fm->cont = NULL;
1596 }
1597 free_fragment_message (fm);
1598 break;
1599 }
1600 if (GNUNET_NO == ret)
1601 {
1602 LOG (GNUNET_ERROR_TYPE_DEBUG,
1603 "Got an ACK, message transmission to `%s' not yet finished\n",
1604 wlan_plugin_address_to_string (NULL,
1605 &mas->endpoint->wlan_addr,
1606 sizeof(mas->endpoint->wlan_addr)));
1607 break;
1608 }
1609 }
1610 if (NULL == fm)
1611 LOG (GNUNET_ERROR_TYPE_DEBUG,
1612 "ACK not matched against any active fragmentation with MAC `%s'\n",
1613 wlan_plugin_address_to_string (NULL,
1614 &mas->endpoint->wlan_addr,
1615 sizeof(mas->endpoint->wlan_addr)));
1616 break;
1617
1618 case GNUNET_MESSAGE_TYPE_WLAN_DATA:
1619 if (NULL == mas->endpoint)
1620 {
1621 GNUNET_break (0);
1622 break;
1623 }
1624 if (msize < sizeof(struct WlanHeader))
1625 {
1626 GNUNET_break (0);
1627 break;
1628 }
1629 wlanheader = (const struct WlanHeader *) hdr;
1630 if (0 != memcmp (&wlanheader->target,
1631 plugin->env->my_identity,
1632 sizeof(struct GNUNET_PeerIdentity)))
1633 {
1634 LOG (GNUNET_ERROR_TYPE_DEBUG,
1635 "Data for `%s', not for me, ignoring\n",
1636 GNUNET_i2s (&wlanheader->target));
1637 break;
1638 }
1639 if (ntohl (wlanheader->crc) !=
1640 GNUNET_CRYPTO_crc32_n (&wlanheader[1],
1641 msize - sizeof(struct WlanHeader)))
1642 {
1643 GNUNET_STATISTICS_update (plugin->env->stats,
1644 _ (
1645 "# DATA messages discarded due to CRC32 error"),
1646 1,
1647 GNUNET_NO);
1648 break;
1649 }
1650 mas->session = lookup_session (mas->endpoint,
1651 &wlanheader->sender);
1652 if (NULL == mas->session)
1653 {
1654 mas->session = create_session (mas->endpoint,
1655 &wlanheader->sender);
1656 address = GNUNET_HELLO_address_allocate (&wlanheader->sender,
1657 PLUGIN_NAME,
1658 &mas->endpoint->wlan_addr,
1659 sizeof(struct WlanAddress),
1660 GNUNET_HELLO_ADDRESS_INFO_NONE);
1661 plugin->env->session_start (plugin->env->cls,
1662 address,
1663 mas->session,
1664 scope);
1665 LOG (GNUNET_ERROR_TYPE_DEBUG,
1666 "Notifying transport about peer `%s''s new session %p \n",
1667 GNUNET_i2s (&wlanheader->sender),
1668 mas->session);
1669 GNUNET_HELLO_address_free (address);
1670 }
1671 LOG (GNUNET_ERROR_TYPE_DEBUG,
1672 "Processing %u bytes of DATA from peer `%s'\n",
1673 (unsigned int) msize,
1674 GNUNET_i2s (&wlanheader->sender));
1675 mas->session->timeout = GNUNET_TIME_relative_to_absolute (
1676 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1677 (void) GNUNET_SERVER_mst_receive (plugin->wlan_header_payload_tokenizer,
1678 mas,
1679 (const char *) &wlanheader[1],
1680 msize - sizeof(struct WlanHeader),
1681 GNUNET_YES,
1682 GNUNET_NO);
1683 break;
1684
1685 default:
1686 if (NULL == mas->endpoint)
1687 {
1688 GNUNET_break (0);
1689 break;
1690 }
1691 if (NULL == mas->session)
1692 {
1693 GNUNET_break (0);
1694 break;
1695 }
1696 LOG (GNUNET_ERROR_TYPE_DEBUG,
1697 "Received packet with %u bytes of type %u from peer %s\n",
1698 (unsigned int) msize,
1699 (unsigned int) ntohs (hdr->type),
1700 GNUNET_i2s (&mas->session->target));
1701 plugin->env->receive (plugin->env->cls,
1702 mas->session->address,
1703 mas->session,
1704 hdr);
1705 break;
1706 }
1707 return GNUNET_OK;
1708}
1709
1710
1711/**
1712 * Task to (periodically) send a HELLO beacon
1713 *
1714 * @param cls pointer to the plugin struct
1715 */
1716static void
1717send_hello_beacon (void *cls)
1718{
1719 struct Plugin *plugin = cls;
1720 uint16_t size;
1721 uint16_t hello_size;
1722 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radioHeader;
1723 const struct GNUNET_MessageHeader *hello;
1724
1725 hello = plugin->env->get_our_hello ();
1726 if (NULL != hello)
1727 {
1728 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
1729 GNUNET_assert (sizeof(struct WlanHeader) + hello_size <= WLAN_MTU);
1730 size = sizeof(struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage)
1731 + hello_size;
1732 {
1733 char buf[size] GNUNET_ALIGN;
1734
1735 LOG (GNUNET_ERROR_TYPE_DEBUG,
1736 "Sending %u byte HELLO beacon\n",
1737 (unsigned int) size);
1738 radioHeader = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage*) buf;
1739 get_radiotap_header (NULL, radioHeader, size);
1740 LOG (GNUNET_ERROR_TYPE_DEBUG,
1741 "Broadcasting %u bytes of data to MAC `%s'\n",
1742 (unsigned int) size,
1743 mac_to_string (&bc_all_mac));
1744 get_wlan_header (plugin, &radioHeader->frame, &bc_all_mac, size);
1745 GNUNET_memcpy (&radioHeader[1], hello, hello_size);
1746 if (NULL !=
1747 GNUNET_HELPER_send (plugin->suid_helper,
1748 &radioHeader->header,
1749 GNUNET_YES /* can drop */,
1750 NULL, NULL))
1751 GNUNET_STATISTICS_update (plugin->env->stats,
1752 _ ("# HELLO beacons sent"),
1753 1, GNUNET_NO);
1754 }
1755 }
1756 plugin->beacon_task =
1757 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
1758 (HELLO_BEACON_SCALING_FACTOR,
1759 plugin->mac_count + 1),
1760 &send_hello_beacon,
1761 plugin);
1762}
1763
1764
1765/**
1766 * Function used for to process the data from the suid process
1767 *
1768 * @param cls the plugin handle
1769 * @param hdr header of the GNUNET_MessageHeader
1770 */
1771static int
1772handle_helper_message (void *cls,
1773 const struct GNUNET_MessageHeader *hdr)
1774{
1775 struct Plugin *plugin = cls;
1776 struct GNUNET_HELLO_Address *my_address;
1777 const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *rxinfo;
1778 const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *cm;
1779 struct WlanAddress wa;
1780 struct MacAndSession mas;
1781 uint16_t msize;
1782 struct FragmentMessage *fm;
1783 struct MacEndpoint *endpoint;
1784
1785 msize = ntohs (hdr->size);
1786 switch (ntohs (hdr->type))
1787 {
1788 case GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL:
1789 if (msize != sizeof(struct GNUNET_TRANSPORT_WLAN_HelperControlMessage))
1790 {
1791 GNUNET_break (0);
1792 break;
1793 }
1794 cm = (const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *) hdr;
1795 if (GNUNET_YES == plugin->have_mac)
1796 {
1797 if (0 == memcmp (&plugin->mac_address,
1798 &cm->mac,
1799 sizeof(struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1800 break; /* no change */
1801 /* remove old address */
1802 memset (&wa, 0, sizeof(struct WlanAddress));
1803 wa.mac = plugin->mac_address;
1804 wa.options = htonl (plugin->options);
1805 my_address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
1806 PLUGIN_NAME,
1807 &wa, sizeof(wa),
1808 GNUNET_HELLO_ADDRESS_INFO_NONE);
1809 plugin->env->notify_address (plugin->env->cls,
1810 GNUNET_NO,
1811 my_address);
1812 GNUNET_HELLO_address_free (my_address);
1813 plugin->mac_address = cm->mac;
1814 }
1815 else
1816 {
1817 plugin->mac_address = cm->mac;
1818 plugin->have_mac = GNUNET_YES;
1819 for (endpoint = plugin->mac_head; NULL != endpoint; endpoint =
1820 endpoint->next)
1821 {
1822 for (fm = endpoint->sending_messages_head; NULL != fm; fm = fm->next)
1823 {
1824 if (NULL != fm->fragcontext)
1825 {
1826 GNUNET_break (0); /* should not happen */
1827 continue;
1828 }
1829 fm->fragcontext =
1830 GNUNET_FRAGMENT_context_create (plugin->env->stats,
1831 WLAN_MTU,
1832 &plugin->tracker,
1833 fm->macendpoint->msg_delay,
1834 fm->macendpoint->ack_delay,
1835 fm->msg,
1836 &transmit_fragment, fm);
1837 GNUNET_free (fm->msg);
1838 fm->msg = NULL;
1839 }
1840 }
1841 GNUNET_break (NULL == plugin->beacon_task);
1842 plugin->beacon_task = GNUNET_SCHEDULER_add_now (&send_hello_beacon,
1843 plugin);
1844 }
1845
1846 memset (&wa, 0, sizeof(struct WlanAddress));
1847 wa.mac = plugin->mac_address;
1848 wa.options = htonl (plugin->options);
1849 my_address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
1850 PLUGIN_NAME,
1851 &wa, sizeof(wa),
1852 GNUNET_HELLO_ADDRESS_INFO_NONE);
1853
1854 LOG (GNUNET_ERROR_TYPE_DEBUG,
1855 "Received WLAN_HELPER_CONTROL message with MAC address `%s' for peer `%s'\n",
1856 mac_to_string (&cm->mac),
1857 GNUNET_i2s (plugin->env->my_identity));
1858 plugin->env->notify_address (plugin->env->cls,
1859 GNUNET_YES,
1860 my_address);
1861 GNUNET_HELLO_address_free (my_address);
1862 break;
1863
1864 case GNUNET_MESSAGE_TYPE_WLAN_DATA_FROM_HELPER:
1865 LOG (GNUNET_ERROR_TYPE_DEBUG,
1866 "Got data message from helper with %u bytes\n",
1867 msize);
1868 GNUNET_STATISTICS_update (plugin->env->stats,
1869 _ ("# DATA messages received"), 1,
1870 GNUNET_NO);
1871 if (msize < sizeof(struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage))
1872 {
1873 LOG (GNUNET_ERROR_TYPE_DEBUG,
1874 "Size of packet is too small (%llu bytes < %llu)\n",
1875 (unsigned long long) msize,
1876 (unsigned long long) sizeof(struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage));
1877 break;
1878 }
1879 rxinfo = (const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *) hdr;
1880
1881 /* check if message is actually for us */
1882 if (0 != memcmp (&rxinfo->frame.addr3, &mac_bssid_gnunet,
1883 sizeof(struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1884 {
1885 /* Not the GNUnet BSSID */
1886 break;
1887 }
1888 if ((0 != memcmp (&rxinfo->frame.addr1, &bc_all_mac,
1889 sizeof(struct GNUNET_TRANSPORT_WLAN_MacAddress))) &&
1890 (0 != memcmp (&rxinfo->frame.addr1, &plugin->mac_address,
1891 sizeof(struct GNUNET_TRANSPORT_WLAN_MacAddress))))
1892 {
1893 /* Neither broadcast nor specifically for us */
1894 break;
1895 }
1896 if (0 == memcmp (&rxinfo->frame.addr2, &plugin->mac_address,
1897 sizeof(struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1898 {
1899 /* packet is FROM us, thus not FOR us */
1900 break;
1901 }
1902
1903 GNUNET_STATISTICS_update (plugin->env->stats,
1904 _ ("# DATA messages processed"),
1905 1, GNUNET_NO);
1906 LOG (GNUNET_ERROR_TYPE_DEBUG,
1907 "Receiving %u bytes of data from MAC `%s'\n",
1908 (unsigned int) (msize - sizeof(struct
1909 GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage)),
1910 mac_to_string (&rxinfo->frame.addr2));
1911 LOG (GNUNET_ERROR_TYPE_DEBUG,
1912 "Receiving %u bytes of data to MAC `%s'\n",
1913 (unsigned int) (msize - sizeof(struct
1914 GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage)),
1915 mac_to_string (&rxinfo->frame.addr1));
1916 LOG (GNUNET_ERROR_TYPE_DEBUG,
1917 "Receiving %u bytes of data with BSSID MAC `%s'\n",
1918 (unsigned int) (msize - sizeof(struct
1919 GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage)),
1920 mac_to_string (&rxinfo->frame.addr3));
1921 wa.mac = rxinfo->frame.addr2;
1922 wa.options = htonl (0);
1923 mas.endpoint = create_macendpoint (plugin, &wa);
1924 mas.session = NULL;
1925 (void) GNUNET_SERVER_mst_receive (plugin->helper_payload_tokenizer,
1926 &mas,
1927 (const char *) &rxinfo[1],
1928 msize - sizeof(struct
1929 GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage),
1930 GNUNET_YES, GNUNET_NO);
1931 break;
1932
1933 default:
1934 GNUNET_break (0);
1935 LOG (GNUNET_ERROR_TYPE_ERROR,
1936 "Unexpected message of type %u (%u bytes)",
1937 ntohs (hdr->type),
1938 ntohs (hdr->size));
1939 break;
1940 }
1941 return GNUNET_OK;
1942}
1943
1944
1945/**
1946 * Another peer has suggested an address for this
1947 * peer and transport plugin. Check that this could be a valid
1948 * address. If so, consider adding it to the list
1949 * of addresses.
1950 *
1951 * @param cls closure
1952 * @param addr pointer to the address
1953 * @param addrlen length of @a addr
1954 * @return #GNUNET_OK if this is a plausible address for this peer
1955 * and transport
1956 */
1957static int
1958wlan_plugin_address_suggested (void *cls,
1959 const void *addr,
1960 size_t addrlen)
1961{
1962 struct Plugin *plugin = cls;
1963 struct WlanAddress *wa = (struct WlanAddress *) addr;
1964
1965 if (addrlen != sizeof(struct WlanAddress))
1966 {
1967 GNUNET_break_op (0);
1968 return GNUNET_SYSERR;
1969 }
1970 if (GNUNET_YES != plugin->have_mac)
1971 {
1972 LOG (GNUNET_ERROR_TYPE_DEBUG,
1973 "Rejecting MAC `%s': I don't know my MAC!\n",
1974 mac_to_string (addr));
1975 return GNUNET_NO; /* don't know my MAC */
1976 }
1977 if (0 != memcmp (&wa->mac,
1978 &plugin->mac_address,
1979 sizeof(wa->mac)))
1980 {
1981 LOG (GNUNET_ERROR_TYPE_DEBUG,
1982 "Rejecting MAC `%s': not my MAC!\n",
1983 mac_to_string (addr));
1984 return GNUNET_NO; /* not my MAC */
1985 }
1986 return GNUNET_OK;
1987}
1988
1989
1990/**
1991 * Convert the transports address to a nice, human-readable format.
1992 *
1993 * @param cls closure
1994 * @param type name of the transport that generated the address
1995 * @param addr one of the addresses of the host, NULL for the last address
1996 * the specific address format depends on the transport
1997 * @param addrlen length of the address
1998 * @param numeric should (IP) addresses be displayed in numeric form?
1999 * @param timeout after how long should we give up?
2000 * @param asc function to call on each string
2001 * @param asc_cls closure for @a asc
2002 */
2003static void
2004wlan_plugin_address_pretty_printer (void *cls,
2005 const char *type,
2006 const void *addr,
2007 size_t addrlen,
2008 int numeric,
2009 struct GNUNET_TIME_Relative timeout,
2010 GNUNET_TRANSPORT_AddressStringCallback asc,
2011 void *asc_cls)
2012{
2013 const char *ret;
2014
2015 if (sizeof(struct WlanAddress) == addrlen)
2016 ret = wlan_plugin_address_to_string (NULL,
2017 addr,
2018 addrlen);
2019 else
2020 ret = NULL;
2021 asc (asc_cls,
2022 ret,
2023 (NULL == ret) ? GNUNET_SYSERR : GNUNET_OK);
2024 asc (asc_cls, NULL, GNUNET_OK);
2025}
2026
2027
2028/**
2029 * Exit point from the plugin.
2030 *
2031 * @param cls pointer to the api struct
2032 */
2033void *
2034LIBGNUNET_PLUGIN_TRANSPORT_DONE (void *cls)
2035{
2036 struct WlanAddress wa;
2037 struct GNUNET_HELLO_Address *address;
2038 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2039 struct Plugin *plugin = api->cls;
2040 struct MacEndpoint *endpoint;
2041 struct MacEndpoint *endpoint_next;
2042
2043 if (NULL == plugin)
2044 {
2045 GNUNET_free (api);
2046 return NULL;
2047 }
2048 if (GNUNET_YES == plugin->have_mac)
2049 {
2050 memset (&wa, 0, sizeof(wa));
2051 wa.options = htonl (plugin->options);
2052 wa.mac = plugin->mac_address;
2053 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
2054 PLUGIN_NAME,
2055 &wa, sizeof(struct WlanAddress),
2056 GNUNET_HELLO_ADDRESS_INFO_NONE);
2057
2058 plugin->env->notify_address (plugin->env->cls,
2059 GNUNET_NO,
2060 address);
2061 plugin->have_mac = GNUNET_NO;
2062 GNUNET_HELLO_address_free (address);
2063 }
2064
2065 if (NULL != plugin->beacon_task)
2066 {
2067 GNUNET_SCHEDULER_cancel (plugin->beacon_task);
2068 plugin->beacon_task = NULL;
2069 }
2070 if (NULL != plugin->suid_helper)
2071 {
2072 GNUNET_HELPER_stop (plugin->suid_helper,
2073 GNUNET_NO);
2074 plugin->suid_helper = NULL;
2075 }
2076 endpoint_next = plugin->mac_head;
2077 while (NULL != (endpoint = endpoint_next))
2078 {
2079 endpoint_next = endpoint->next;
2080 free_macendpoint (endpoint);
2081 }
2082 if (NULL != plugin->fragment_data_tokenizer)
2083 {
2084 GNUNET_SERVER_mst_destroy (plugin->fragment_data_tokenizer);
2085 plugin->fragment_data_tokenizer = NULL;
2086 }
2087 if (NULL != plugin->wlan_header_payload_tokenizer)
2088 {
2089 GNUNET_SERVER_mst_destroy (plugin->wlan_header_payload_tokenizer);
2090 plugin->wlan_header_payload_tokenizer = NULL;
2091 }
2092 if (NULL != plugin->helper_payload_tokenizer)
2093 {
2094 GNUNET_SERVER_mst_destroy (plugin->helper_payload_tokenizer);
2095 plugin->helper_payload_tokenizer = NULL;
2096 }
2097 GNUNET_free (plugin->wlan_interface);
2098 GNUNET_free (plugin);
2099 GNUNET_free (api);
2100 return NULL;
2101}
2102
2103
2104/**
2105 * Function called to convert a string address to
2106 * a binary address.
2107 *
2108 * @param cls closure (`struct Plugin *`)
2109 * @param addr string address
2110 * @param addrlen length of the address
2111 * @param buf location to store the buffer
2112 * @param added location to store the number of bytes in the buffer.
2113 * If the function returns #GNUNET_SYSERR, its contents are undefined.
2114 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
2115 */
2116static int
2117wlan_plugin_string_to_address (void *cls,
2118 const char *addr,
2119 uint16_t addrlen,
2120 void **buf,
2121 size_t *added)
2122{
2123 struct WlanAddress *wa;
2124 unsigned int a[6];
2125 unsigned int i;
2126 char plugin[5];
2127 uint32_t options;
2128
2129 if ((NULL == addr) || (0 == addrlen))
2130 {
2131 GNUNET_break (0);
2132 return GNUNET_SYSERR;
2133 }
2134 if ('\0' != addr[addrlen - 1])
2135 {
2136 GNUNET_break (0);
2137 return GNUNET_SYSERR;
2138 }
2139 if (strlen (addr) != addrlen - 1)
2140 {
2141 GNUNET_break (0);
2142 return GNUNET_SYSERR;
2143 }
2144
2145 if (8 != sscanf (addr,
2146 "%4s.%u.%X:%X:%X:%X:%X:%X",
2147 plugin, &options,
2148 &a[0], &a[1], &a[2],
2149 &a[3], &a[4], &a[5]))
2150 {
2151 GNUNET_break (0);
2152 return GNUNET_SYSERR;
2153 }
2154 wa = GNUNET_new (struct WlanAddress);
2155 for (i = 0; i < 6; i++)
2156 wa->mac.mac[i] = a[i];
2157 wa->options = htonl (0);
2158 *buf = wa;
2159 *added = sizeof(struct WlanAddress);
2160 return GNUNET_OK;
2161}
2162
2163
2164/**
2165 * Begin monitoring sessions of a plugin. There can only
2166 * be one active monitor per plugin (i.e. if there are
2167 * multiple monitors, the transport service needs to
2168 * multiplex the generated events over all of them).
2169 *
2170 * @param cls closure of the plugin
2171 * @param sic callback to invoke, NULL to disable monitor;
2172 * plugin will being by iterating over all active
2173 * sessions immediately and then enter monitor mode
2174 * @param sic_cls closure for @a sic
2175 */
2176static void
2177wlan_plugin_setup_monitor (void *cls,
2178 GNUNET_TRANSPORT_SessionInfoCallback sic,
2179 void *sic_cls)
2180{
2181 struct Plugin *plugin = cls;
2182 struct MacEndpoint *mac;
2183 struct GNUNET_ATS_Session *session;
2184
2185 plugin->sic = sic;
2186 plugin->sic_cls = sic_cls;
2187 if (NULL != sic)
2188 {
2189 for (mac = plugin->mac_head; NULL != mac; mac = mac->next)
2190 for (session = mac->sessions_head; NULL != session; session =
2191 session->next)
2192 {
2193 notify_session_monitor (plugin,
2194 session,
2195 GNUNET_TRANSPORT_SS_INIT);
2196 notify_session_monitor (plugin,
2197 session,
2198 GNUNET_TRANSPORT_SS_UP);
2199 }
2200 sic (sic_cls, NULL, NULL);
2201 }
2202}
2203
2204
2205/**
2206 * Function that will be called whenever the transport service wants to
2207 * notify the plugin that a session is still active and in use and
2208 * therefore the session timeout for this session has to be updated
2209 *
2210 * @param cls closure
2211 * @param peer which peer was the session for
2212 * @param session which session is being updated
2213 */
2214static void
2215wlan_plugin_update_session_timeout (void *cls,
2216 const struct GNUNET_PeerIdentity *peer,
2217 struct GNUNET_ATS_Session *session)
2218{
2219 GNUNET_assert (NULL != session->timeout_task);
2220 session->timeout = GNUNET_TIME_relative_to_absolute (
2221 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2222}
2223
2224
2225/**
2226 * Function that will be called whenever the transport service wants to
2227 * notify the plugin that the inbound quota changed and that the plugin
2228 * should update it's delay for the next receive value
2229 *
2230 * @param cls closure
2231 * @param peer which peer was the session for
2232 * @param session which session is being updated
2233 * @param delay new delay to use for receiving
2234 */
2235static void
2236wlan_plugin_update_inbound_delay (void *cls,
2237 const struct GNUNET_PeerIdentity *peer,
2238 struct GNUNET_ATS_Session *session,
2239 struct GNUNET_TIME_Relative delay)
2240{
2241 /* does nothing, as inbound delay is not supported by WLAN */
2242}
2243
2244
2245/**
2246 * Entry point for the plugin.
2247 *
2248 * @param cls closure, the `struct GNUNET_TRANSPORT_PluginEnvironment *`
2249 * @return the `struct GNUNET_TRANSPORT_PluginFunctions *` or NULL on error
2250 */
2251void *
2252LIBGNUNET_PLUGIN_TRANSPORT_INIT (void *cls)
2253{
2254 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2255 struct GNUNET_TRANSPORT_PluginFunctions *api;
2256 struct Plugin *plugin;
2257 char *wlan_interface;
2258 unsigned long long testmode;
2259 char *binary;
2260
2261 /* check for 'special' mode */
2262 if (NULL == env->receive)
2263 {
2264 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2265 initialize the plugin or the API */
2266 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2267 api->cls = NULL;
2268 api->address_pretty_printer = &wlan_plugin_address_pretty_printer;
2269 api->address_to_string = &wlan_plugin_address_to_string;
2270 api->string_to_address = &wlan_plugin_string_to_address;
2271 return api;
2272 }
2273
2274 testmode = 0;
2275 /* check configuration */
2276 if ((GNUNET_YES ==
2277 GNUNET_CONFIGURATION_have_value (env->cfg,
2278 CONFIG_NAME,
2279 "TESTMODE")) &&
2280 ((GNUNET_SYSERR ==
2281 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2282 CONFIG_NAME,
2283 "TESTMODE",
2284 &testmode)) ||
2285 (testmode > 2)))
2286 {
2287 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2288 CONFIG_NAME,
2289 "TESTMODE");
2290 return NULL;
2291 }
2292 binary = GNUNET_OS_get_libexec_binary_path (HELPER_NAME);
2293 if ((0 == testmode) &&
2294 (GNUNET_YES !=
2295 GNUNET_OS_check_helper_binary (binary,
2296 GNUNET_YES,
2297 NULL)))
2298 {
2299 LOG (GNUNET_ERROR_TYPE_ERROR,
2300 _ ("Helper binary `%s' not SUID, cannot run WLAN transport\n"),
2301 HELPER_NAME);
2302 GNUNET_free (binary);
2303 return NULL;
2304 }
2305 GNUNET_free (binary);
2306 if (GNUNET_YES !=
2307 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2308 CONFIG_NAME,
2309 "INTERFACE",
2310 &wlan_interface))
2311 {
2312 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2313 CONFIG_NAME,
2314 "INTERFACE");
2315 return NULL;
2316 }
2317
2318 plugin = GNUNET_new (struct Plugin);
2319 plugin->wlan_interface = wlan_interface;
2320 plugin->env = env;
2321 GNUNET_STATISTICS_set (plugin->env->stats,
2322 _ ("# sessions allocated"),
2323 0, GNUNET_NO);
2324 GNUNET_STATISTICS_set (plugin->env->stats,
2325 _ ("# MAC endpoints allocated"),
2326 0, 0);
2327 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker, NULL, NULL,
2328 GNUNET_BANDWIDTH_value_init (100 * 1024
2329 * 1024 / 8),
2330 100);
2331 plugin->fragment_data_tokenizer = GNUNET_SERVER_mst_create (&process_data,
2332 plugin);
2333 plugin->wlan_header_payload_tokenizer = GNUNET_SERVER_mst_create (
2334 &process_data,
2335 plugin);
2336 plugin->helper_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data,
2337 plugin);
2338
2339 plugin->options = 0;
2340
2341 /* some compilers do not like switch on 'long long'... */
2342 switch ((unsigned int) testmode)
2343 {
2344 case 0: /* normal */
2345 plugin->helper_argv[0] = (char *) HELPER_NAME;
2346 plugin->helper_argv[1] = wlan_interface;
2347 plugin->helper_argv[2] = NULL;
2348 plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
2349 HELPER_NAME,
2350 plugin->helper_argv,
2351 &handle_helper_message,
2352 NULL,
2353 plugin);
2354 break;
2355
2356 case 1: /* testmode, peer 1 */
2357 plugin->helper_argv[0] = (char *) DUMMY_HELPER_NAME;
2358 plugin->helper_argv[1] = (char *) "1";
2359 plugin->helper_argv[2] = NULL;
2360 plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
2361 DUMMY_HELPER_NAME,
2362 plugin->helper_argv,
2363 &handle_helper_message,
2364 NULL,
2365 plugin);
2366 break;
2367
2368 case 2: /* testmode, peer 2 */
2369 plugin->helper_argv[0] = (char *) DUMMY_HELPER_NAME;
2370 plugin->helper_argv[1] = (char *) "2";
2371 plugin->helper_argv[2] = NULL;
2372 plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
2373 DUMMY_HELPER_NAME,
2374 plugin->helper_argv,
2375 &handle_helper_message,
2376 NULL,
2377 plugin);
2378 break;
2379
2380 default:
2381 GNUNET_assert (0);
2382 }
2383
2384 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2385 api->cls = plugin;
2386 api->send = &wlan_plugin_send;
2387 api->get_session = &wlan_plugin_get_session;
2388 api->disconnect_peer = &wlan_plugin_disconnect_peer;
2389 api->disconnect_session = &wlan_plugin_disconnect_session;
2390 api->query_keepalive_factor = &wlan_plugin_query_keepalive_factor;
2391 api->address_pretty_printer = &wlan_plugin_address_pretty_printer;
2392 api->check_address = &wlan_plugin_address_suggested;
2393 api->address_to_string = &wlan_plugin_address_to_string;
2394 api->string_to_address = &wlan_plugin_string_to_address;
2395 api->get_network = &wlan_plugin_get_network;
2396 api->get_network_for_address = &wlan_plugin_get_network_for_address;
2397 api->update_session_timeout = &wlan_plugin_update_session_timeout;
2398 api->update_inbound_delay = &wlan_plugin_update_inbound_delay;
2399 api->setup_monitor = &wlan_plugin_setup_monitor;
2400 return api;
2401}
2402
2403
2404/* end of plugin_transport_wlan.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-30 22:47:47 +0000