2 This file is part of GNUnet
3 (C) 2010, 2011, 2012 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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13 General Public License for more details.
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22 * @file transport/plugin_transport_wlan.c
23 * @brief transport plugin for wlan
24 * @author David Brodski
25 * @author Christian Grothoff
28 #include "gnunet_hello_lib.h"
29 #include "gnunet_protocols.h"
30 #include "gnunet_util_lib.h"
31 #include "gnunet_statistics_service.h"
32 #include "gnunet_transport_service.h"
33 #include "gnunet_transport_plugin.h"
34 #include "plugin_transport_wlan.h"
35 #include "gnunet_common.h"
36 #include "gnunet_crypto_lib.h"
37 #include "gnunet_fragmentation_lib.h"
38 #include "gnunet_constants.h"
40 #define LOG(kind,...) GNUNET_log_from (kind, "transport-wlan",__VA_ARGS__)
43 * Max size of packet (that we give to the WLAN driver for transmission)
48 * time out of a mac endpoint
50 #define MACENDPOINT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2)
53 * We reduce the frequence of HELLO beacons in relation to
54 * the number of MAC addresses currently visible to us.
55 * This is the multiplication factor.
57 #define HELLO_BEACON_SCALING_FACTOR GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 2)
60 * Maximum number of messages in defragmentation queue per MAC
62 #define MESSAGES_IN_DEFRAG_QUEUE_PER_MAC 2
65 * Link layer control fields for better compatibility
66 * (i.e. GNUnet over WLAN is not IP-over-WLAN).
68 #define WLAN_LLC_DSAP_FIELD 0x1f
69 #define WLAN_LLC_SSAP_FIELD 0x1f
72 GNUNET_NETWORK_STRUCT_BEGIN
74 * Header for messages which need fragmentation. This is the format of
75 * a message we obtain AFTER defragmentation. We then need to check
76 * the CRC and then tokenize the payload and pass it to the
83 * Message type is GNUNET_MESSAGE_TYPE_WLAN_DATA.
85 struct GNUNET_MessageHeader header;
88 * CRC32 checksum (only over the payload), in NBO.
90 uint32_t crc GNUNET_PACKED;
93 * Sender of the message.
95 struct GNUNET_PeerIdentity sender;
98 * Target of the message.
100 struct GNUNET_PeerIdentity target;
102 /* followed by payload, possibly including
103 multiple messages! */
106 GNUNET_NETWORK_STRUCT_END
110 * Information kept for each message that is yet to be fragmented and
113 struct PendingMessage
116 * next entry in the DLL
118 struct PendingMessage *next;
121 * previous entry in the DLL
123 struct PendingMessage *prev;
126 * The pending message
128 struct WlanHeader *msg;
131 * Continuation function to call once the message
132 * has been sent. Can be NULL if there is no
133 * continuation to call.
135 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
138 * Cls for transmit_cont
140 void *transmit_cont_cls;
143 * Timeout task (for this message).
145 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
151 * Session handle for connections with other peers.
157 * API requirement (must be first).
159 struct SessionHeader header;
162 * We keep all sessions in a DLL at their respective
163 * 'struct MACEndpoint'.
165 struct Session *next;
168 * We keep all sessions in a DLL at their respective
169 * 'struct MACEndpoint'.
171 struct Session *prev;
174 * MAC endpoint with the address of this peer.
176 struct MacEndpoint *mac;
179 * Head of messages currently pending for transmission to this peer.
181 struct PendingMessage *pending_message_head;
184 * Tail of messages currently pending for transmission to this peer.
186 struct PendingMessage *pending_message_tail;
189 * To whom are we talking to (set to our identity
190 * if we are still waiting for the welcome message)
192 struct GNUNET_PeerIdentity target;
195 * When should this session time out?
197 struct GNUNET_TIME_Absolute timeout;
200 * Timeout task (for the session).
202 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
208 * Struct for messages that are being fragmented in a MAC's transmission queue.
210 struct FragmentMessage
214 * This is a doubly-linked list.
216 struct FragmentMessage *next;
219 * This is a doubly-linked list.
221 struct FragmentMessage *prev;
224 * MAC endpoint this message belongs to
226 struct MacEndpoint *macendpoint;
229 * Fragmentation context
231 struct GNUNET_FRAGMENT_Context *fragcontext;
234 * Transmission handle to helper (to cancel if the frag context
235 * is destroyed early for some reason).
237 struct GNUNET_HELPER_SendHandle *sh;
240 * Intended recipient.
242 struct GNUNET_PeerIdentity target;
245 * Timeout value for the message.
247 struct GNUNET_TIME_Absolute timeout;
252 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
255 * Continuation to call when we're done with this message.
257 GNUNET_TRANSPORT_TransmitContinuation cont;
268 * Struct to represent one network card connection
274 * We keep all MACs in a DLL in the plugin.
276 struct MacEndpoint *next;
279 * We keep all MACs in a DLL in the plugin.
281 struct MacEndpoint *prev;
284 * Pointer to the global plugin struct.
286 struct Plugin *plugin;
289 * Head of sessions that use this MAC.
291 struct Session *sessions_head;
294 * Tail of sessions that use this MAC.
296 struct Session *sessions_tail;
299 * Head of messages we are currently sending to this MAC.
301 struct FragmentMessage *sending_messages_head;
304 * Tail of messages we are currently sending to this MAC.
306 struct FragmentMessage *sending_messages_tail;
309 * Defrag context for this MAC
311 struct GNUNET_DEFRAGMENT_Context *defrag;
314 * When should this endpoint time out?
316 struct GNUNET_TIME_Absolute timeout;
321 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
324 * count of messages in the fragment out queue for this mac endpoint
326 unsigned int fragment_messages_out_count;
331 struct GNUNET_TRANSPORT_WLAN_MacAddress addr;
334 * Desired transmission power for this MAC
339 * Desired transmission rate for this MAC
344 * Antenna we should use for this MAC
352 * Encapsulation of all of the state of the plugin.
359 struct GNUNET_TRANSPORT_PluginEnvironment *env;
362 * Handle to helper process for priviledged operations.
364 struct GNUNET_HELPER_Handle *suid_helper;
367 * ARGV-vector for the helper (all helpers take only the binary
368 * name, one actual argument, plus the NULL terminator for 'argv').
370 char * helper_argv[3];
373 * The interface of the wlan card given to us by the user.
378 * Tokenizer for demultiplexing of data packets resulting from defragmentation.
380 struct GNUNET_SERVER_MessageStreamTokenizer *fragment_data_tokenizer;
383 * Tokenizer for demultiplexing of data packets received from the suid helper
385 struct GNUNET_SERVER_MessageStreamTokenizer *helper_payload_tokenizer;
388 * Tokenizer for demultiplexing of data packets that follow the WLAN Header
390 struct GNUNET_SERVER_MessageStreamTokenizer *wlan_header_payload_tokenizer;
393 * Head of list of open connections.
395 struct MacEndpoint *mac_head;
398 * Tail of list of open connections.
400 struct MacEndpoint *mac_tail;
403 * Number of connections
405 unsigned int mac_count;
408 * Task that periodically sends a HELLO beacon via the helper.
410 GNUNET_SCHEDULER_TaskIdentifier beacon_task;
413 * Tracker for bandwidth limit
415 struct GNUNET_BANDWIDTH_Tracker tracker;
418 * The mac_address of the wlan card given to us by the helper.
420 struct GNUNET_TRANSPORT_WLAN_MacAddress mac_address;
423 * Have we received a control message with our MAC address yet?
432 * Information associated with a message. Can contain
433 * the session or the MAC endpoint associated with the
439 * NULL if the identity of the other peer is not known.
441 struct Session *session;
444 * MAC address of the other peer, NULL if not known.
446 struct MacEndpoint *endpoint;
451 * Print MAC addresses nicely.
453 * @param mac the mac address
454 * @return string to a static buffer with the human-readable mac, will be overwritten during the next call to this function
457 mac_to_string (const struct GNUNET_TRANSPORT_WLAN_MacAddress * mac)
459 static char macstr[20];
461 GNUNET_snprintf (macstr, sizeof (macstr), "%.2X:%.2X:%.2X:%.2X:%.2X:%.2X", mac->mac[0], mac->mac[1],
462 mac->mac[2], mac->mac[3], mac->mac[4], mac->mac[5]);
468 * Fill the radiotap header
470 * @param endpoint pointer to the endpoint, can be NULL
471 * @param header pointer to the radiotap header
472 * @param size total message size
475 get_radiotap_header (struct MacEndpoint *endpoint,
476 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *header,
479 header->header.type = ntohs (GNUNET_MESSAGE_TYPE_WLAN_DATA_TO_HELPER);
480 header->header.size = ntohs (size);
481 if (NULL != endpoint)
483 header->rate = endpoint->rate;
484 header->tx_power = endpoint->tx_power;
485 header->antenna = endpoint->antenna;
490 header->tx_power = 0;
497 * Generate the WLAN hardware header for one packet
499 * @param header address to write the header to
500 * @param to_mac_addr address of the recipient
501 * @param size size of the whole packet, needed to calculate the time to send the packet
504 get_wlan_header (struct Plugin *plugin,
505 struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame *header,
506 const struct GNUNET_TRANSPORT_WLAN_MacAddress *to_mac_addr,
509 const int rate = 11000000;
511 header->frame_control = htons (IEEE80211_FC0_TYPE_DATA);
512 header->addr1 = *to_mac_addr;
513 header->addr2 = plugin->mac_address;
514 header->addr3 = mac_bssid_gnunet;
515 header->duration = GNUNET_htole16 ((size * 1000000) / rate + 290);
516 header->sequence_control = 0; // FIXME?
517 header->llc[0] = WLAN_LLC_DSAP_FIELD;
518 header->llc[1] = WLAN_LLC_SSAP_FIELD;
519 header->llc[2] = 0; // FIXME?
520 header->llc[3] = 0; // FIXME?
525 * Send an ACK for a fragment we received.
527 * @param cls the 'struct MacEndpoint' the ACK must be sent to
528 * @param msg_id id of the message
529 * @param hdr pointer to the hdr where the ack is stored
532 send_ack (void *cls, uint32_t msg_id,
533 const struct GNUNET_MessageHeader *hdr)
535 struct MacEndpoint *endpoint = cls;
536 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage* radio_header;
537 uint16_t msize = ntohs (hdr->size);
538 size_t size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + msize;
541 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
546 LOG (GNUNET_ERROR_TYPE_DEBUG,
547 "Sending ACK to helper\n");
548 radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
549 get_radiotap_header (endpoint, radio_header, size);
550 get_wlan_header (endpoint->plugin,
551 &radio_header->frame,
554 memcpy (&radio_header[1], hdr, msize);
556 GNUNET_HELPER_send (endpoint->plugin->suid_helper,
557 &radio_header->header,
558 GNUNET_NO /* dropping ACKs is bad */,
560 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN ACKs sent"),
566 * Handles the data after all fragments are put together
568 * @param cls macendpoint this messages belongs to
569 * @param hdr pointer to the data
572 wlan_data_message_handler (void *cls, const struct GNUNET_MessageHeader *hdr)
574 struct MacEndpoint *endpoint = cls;
575 struct Plugin *plugin = endpoint->plugin;
576 struct MacAndSession mas;
578 GNUNET_STATISTICS_update (plugin->env->stats,
579 _("# WLAN messages defragmented"), 1,
582 mas.endpoint = endpoint;
583 (void) GNUNET_SERVER_mst_receive (plugin->fragment_data_tokenizer,
587 GNUNET_YES, GNUNET_NO);
594 * @param session the session free
597 free_session (struct Session *session)
599 struct MacEndpoint *endpoint = session->mac;
600 struct PendingMessage *pm;
602 endpoint->plugin->env->session_end (endpoint->plugin->env->cls,
605 while (NULL != (pm = session->pending_message_head))
607 GNUNET_CONTAINER_DLL_remove (session->pending_message_head,
608 session->pending_message_tail, pm);
609 if (GNUNET_SCHEDULER_NO_TASK != pm->timeout_task)
611 GNUNET_SCHEDULER_cancel (pm->timeout_task);
612 pm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
614 GNUNET_free (pm->msg);
617 GNUNET_CONTAINER_DLL_remove (endpoint->sessions_head,
618 endpoint->sessions_tail,
620 if (session->timeout_task != GNUNET_SCHEDULER_NO_TASK)
622 GNUNET_SCHEDULER_cancel (session->timeout_task);
623 session->timeout_task = GNUNET_SCHEDULER_NO_TASK;
625 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN sessions allocated"), -1,
627 GNUNET_free (session);
632 * A session is timing out. Clean up.
634 * @param cls pointer to the Session
635 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
638 session_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
640 struct Session * session = cls;
641 struct GNUNET_TIME_Relative timeout;
643 session->timeout_task = GNUNET_SCHEDULER_NO_TASK;
644 timeout = GNUNET_TIME_absolute_get_remaining (session->timeout);
645 if (0 == timeout.rel_value)
647 free_session (session);
650 session->timeout_task =
651 GNUNET_SCHEDULER_add_delayed (timeout, &session_timeout, session);
656 * Create a new session
658 * @param endpoint pointer to the mac endpoint of the peer
659 * @param peer peer identity to use for this session
660 * @return returns the session
662 static struct Session *
663 create_session (struct MacEndpoint *endpoint,
664 const struct GNUNET_PeerIdentity *peer)
666 struct Session *session;
668 for (session = endpoint->sessions_head; NULL != session; session = session->next)
669 if (0 == memcmp (peer, &session->target,
670 sizeof (struct GNUNET_PeerIdentity)))
672 session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
675 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN sessions allocated"), 1,
677 session = GNUNET_malloc (sizeof (struct Session));
678 GNUNET_CONTAINER_DLL_insert_tail (endpoint->sessions_head,
679 endpoint->sessions_tail,
681 session->mac = endpoint;
682 session->target = *peer;
683 session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
684 session->timeout_task =
685 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, &session_timeout, session);
686 LOG (GNUNET_ERROR_TYPE_DEBUG,
687 "Created new session for peer `%s' with endpoint %s\n",
689 mac_to_string (&endpoint->addr));
695 * Function called once we have successfully given the fragment
696 * message to the SUID helper process and we are thus ready for
699 * @param cls the 'struct FragmentMessage'
700 * @param result result of the operation (GNUNET_OK on success, GNUNET_NO if the helper died, GNUNET_SYSERR
701 * if the helper was stopped)
704 fragment_transmission_done (void *cls,
707 struct FragmentMessage *fm = cls;
710 GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
715 * Transmit a fragment of a message.
717 * @param cls 'struct FragmentMessage' this fragment message belongs to
718 * @param hdr pointer to the start of the fragment message
721 transmit_fragment (void *cls,
722 const struct GNUNET_MessageHeader *hdr)
724 struct FragmentMessage *fm = cls;
725 struct MacEndpoint *endpoint = fm->macendpoint;
729 msize = ntohs (hdr->size);
730 size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + msize;
733 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radio_header;
735 radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
736 get_radiotap_header (endpoint, radio_header, size);
737 get_wlan_header (endpoint->plugin,
738 &radio_header->frame,
741 memcpy (&radio_header[1], hdr, msize);
742 GNUNET_assert (NULL == fm->sh);
743 fm->sh = GNUNET_HELPER_send (endpoint->plugin->suid_helper,
744 &radio_header->header,
746 &fragment_transmission_done, fm);
748 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN message fragments sent"),
751 GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
757 * Frees the space of a message in the fragment queue (send queue)
759 * @param fm message to free
762 free_fragment_message (struct FragmentMessage *fm)
764 struct MacEndpoint *endpoint = fm->macendpoint;
766 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN messages pending (with fragmentation)"),
768 GNUNET_CONTAINER_DLL_remove (endpoint->sending_messages_head,
769 endpoint->sending_messages_tail, fm);
772 GNUNET_HELPER_send_cancel (fm->sh);
775 GNUNET_FRAGMENT_context_destroy (fm->fragcontext);
776 if (fm->timeout_task != GNUNET_SCHEDULER_NO_TASK)
778 GNUNET_SCHEDULER_cancel (fm->timeout_task);
779 fm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
786 * A FragmentMessage has timed out. Remove it.
788 * @param cls pointer to the 'struct FragmentMessage'
789 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
792 fragmentmessage_timeout (void *cls,
793 const struct GNUNET_SCHEDULER_TaskContext *tc)
795 struct FragmentMessage *fm = cls;
797 fm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
798 if (NULL != fm->cont)
800 fm->cont (fm->cont_cls, &fm->target, GNUNET_SYSERR);
803 free_fragment_message (fm);
808 * Transmit a message to the given destination with fragmentation.
810 * @param endpoint desired destination
811 * @param timeout how long can the message wait?
812 * @param target peer that should receive the message
813 * @param msg message to transmit
814 * @param cont continuation to call once the message has
815 * been transmitted (or if the transport is ready
816 * for the next transmission call; or if the
817 * peer disconnected...); can be NULL
818 * @param cont_cls closure for cont
821 send_with_fragmentation (struct MacEndpoint *endpoint,
822 struct GNUNET_TIME_Relative timeout,
823 const struct GNUNET_PeerIdentity *target,
824 const struct GNUNET_MessageHeader *msg,
825 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
828 struct FragmentMessage *fm;
829 struct Plugin *plugin;
831 plugin = endpoint->plugin;
832 fm = GNUNET_malloc (sizeof (struct FragmentMessage));
833 fm->macendpoint = endpoint;
834 fm->target = *target;
835 fm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
837 fm->cont_cls = cont_cls;
839 GNUNET_FRAGMENT_context_create (plugin->env->stats, WLAN_MTU,
841 GNUNET_TIME_UNIT_SECONDS,
843 &transmit_fragment, fm);
845 GNUNET_SCHEDULER_add_delayed (timeout,
846 &fragmentmessage_timeout, fm);
847 GNUNET_CONTAINER_DLL_insert_tail (endpoint->sending_messages_head,
848 endpoint->sending_messages_tail,
854 * Free a MAC endpoint.
856 * @param endpoint pointer to the MacEndpoint to free
859 free_macendpoint (struct MacEndpoint *endpoint)
861 struct Plugin *plugin = endpoint->plugin;
862 struct FragmentMessage *fm;
863 struct Session *session;
865 GNUNET_STATISTICS_update (plugin->env->stats,
866 _("# WLAN MAC endpoints allocated"), -1, GNUNET_NO);
867 while (NULL != (session = endpoint->sessions_head))
868 free_session (session);
869 while (NULL != (fm = endpoint->sending_messages_head))
870 free_fragment_message (fm);
871 GNUNET_CONTAINER_DLL_remove (plugin->mac_head,
875 if (GNUNET_SCHEDULER_NO_TASK != endpoint->timeout_task)
877 GNUNET_SCHEDULER_cancel (endpoint->timeout_task);
878 endpoint->timeout_task = GNUNET_SCHEDULER_NO_TASK;
880 GNUNET_free (endpoint);
885 * A MAC endpoint is timing out. Clean up.
887 * @param cls pointer to the MacEndpoint
888 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
891 macendpoint_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
893 struct MacEndpoint *endpoint = cls;
894 struct GNUNET_TIME_Relative timeout;
896 endpoint->timeout_task = GNUNET_SCHEDULER_NO_TASK;
897 timeout = GNUNET_TIME_absolute_get_remaining (endpoint->timeout);
898 if (0 == timeout.rel_value)
900 free_macendpoint (endpoint);
903 endpoint->timeout_task =
904 GNUNET_SCHEDULER_add_delayed (timeout, &macendpoint_timeout,
910 * Find (or create) a MacEndpoint with a specific MAC address
912 * @param plugin pointer to the plugin struct
913 * @param addr the MAC address of the endpoint
914 * @return handle to our data structure for this MAC
916 static struct MacEndpoint *
917 create_macendpoint (struct Plugin *plugin,
918 const struct GNUNET_TRANSPORT_WLAN_MacAddress *addr)
920 struct MacEndpoint *pos;
922 for (pos = plugin->mac_head; NULL != pos; pos = pos->next)
923 if (0 == memcmp (addr, &pos->addr, sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
925 pos = GNUNET_malloc (sizeof (struct MacEndpoint));
927 pos->plugin = plugin;
929 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, WLAN_MTU,
930 MESSAGES_IN_DEFRAG_QUEUE_PER_MAC,
932 &wlan_data_message_handler,
934 pos->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
936 GNUNET_SCHEDULER_add_delayed (MACENDPOINT_TIMEOUT, &macendpoint_timeout,
938 GNUNET_CONTAINER_DLL_insert (plugin->mac_head, plugin->mac_tail, pos);
940 GNUNET_STATISTICS_update (plugin->env->stats, _("# WLAN MAC endpoints allocated"),
942 LOG (GNUNET_ERROR_TYPE_DEBUG,
943 "New MAC endpoint `%s'\n",
944 mac_to_string (addr));
950 * Creates a new outbound session the transport service will use to send data to the
953 * @param cls the plugin
954 * @param address the address
955 * @return the session or NULL of max connections exceeded
957 static struct Session *
958 wlan_plugin_get_session (void *cls,
959 const struct GNUNET_HELLO_Address *address)
961 struct Plugin *plugin = cls;
962 struct MacEndpoint *endpoint;
966 if (sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress) != address->address_length)
971 LOG (GNUNET_ERROR_TYPE_DEBUG,
972 "Service asked to create session for peer `%s' with MAC `%s'\n",
973 GNUNET_i2s (&address->peer),
974 mac_to_string (address->address));
975 endpoint = create_macendpoint (plugin, address->address);
976 return create_session (endpoint, &address->peer);
981 * Function that can be used to force the plugin to disconnect
982 * from the given peer and cancel all previous transmissions
983 * (and their continuation).
986 * @param target peer from which to disconnect
989 wlan_plugin_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
991 struct Plugin *plugin = cls;
992 struct Session *session;
993 struct MacEndpoint *endpoint;
995 for (endpoint = plugin->mac_head; NULL != endpoint; endpoint = endpoint->next)
996 for (session = endpoint->sessions_head; NULL != session; session = session->next)
997 if (0 == memcmp (target, &session->target,
998 sizeof (struct GNUNET_PeerIdentity)))
1000 free_session (session);
1001 break; /* inner-loop only (in case peer has another MAC as well!) */
1007 * Function that can be used by the transport service to transmit
1008 * a message using the plugin. Note that in the case of a
1009 * peer disconnecting, the continuation MUST be called
1010 * prior to the disconnect notification itself. This function
1011 * will be called with this peer's HELLO message to initiate
1012 * a fresh connection to another peer.
1014 * @param cls closure
1015 * @param session which session must be used
1016 * @param msgbuf the message to transmit
1017 * @param msgbuf_size number of bytes in 'msgbuf'
1018 * @param priority how important is the message (most plugins will
1019 * ignore message priority and just FIFO)
1020 * @param to how long to wait at most for the transmission (does not
1021 * require plugins to discard the message after the timeout,
1022 * just advisory for the desired delay; most plugins will ignore
1024 * @param cont continuation to call once the message has
1025 * been transmitted (or if the transport is ready
1026 * for the next transmission call; or if the
1027 * peer disconnected...); can be NULL
1028 * @param cont_cls closure for cont
1029 * @return number of bytes used (on the physical network, with overheads);
1030 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1031 * and does NOT mean that the message was not transmitted (DV)
1034 wlan_plugin_send (void *cls,
1035 struct Session *session,
1036 const char *msgbuf, size_t msgbuf_size,
1037 unsigned int priority,
1038 struct GNUNET_TIME_Relative to,
1039 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1041 struct Plugin *plugin = cls;
1042 struct WlanHeader *wlanheader;
1043 size_t size = msgbuf_size + sizeof (struct WlanHeader);
1044 char buf[size] GNUNET_ALIGN;
1046 LOG (GNUNET_ERROR_TYPE_DEBUG,
1047 "Transmitting %u bytes of payload to peer `%s' (starting with %u byte message of type %u)\n",
1049 GNUNET_i2s (&session->target),
1050 (unsigned int) ntohs (((struct GNUNET_MessageHeader*)msgbuf)->size),
1051 (unsigned int) ntohs (((struct GNUNET_MessageHeader*)msgbuf)->type));
1052 wlanheader = (struct WlanHeader *) buf;
1053 wlanheader->header.size = htons (msgbuf_size + sizeof (struct WlanHeader));
1054 wlanheader->header.type = htons (GNUNET_MESSAGE_TYPE_WLAN_DATA);
1055 wlanheader->sender = *plugin->env->my_identity;
1056 wlanheader->target = session->target;
1057 wlanheader->crc = htonl (GNUNET_CRYPTO_crc32_n (msgbuf, msgbuf_size));
1058 memcpy (&wlanheader[1], msgbuf, msgbuf_size);
1059 send_with_fragmentation (session->mac,
1062 &wlanheader->header,
1069 * We have received data from the WLAN via some session. Process depending
1070 * on the message type (HELLO, DATA, FRAGMENTATION or FRAGMENTATION-ACK).
1072 * @param cls pointer to the plugin
1073 * @param client pointer to the session this message belongs to
1074 * @param hdr start of the message
1077 process_data (void *cls, void *client, const struct GNUNET_MessageHeader *hdr)
1079 struct Plugin *plugin = cls;
1080 struct MacAndSession *mas = client;
1081 struct MacAndSession xmas;
1083 struct GNUNET_ATS_Information ats[NUM_ATS]; /* FIXME: do better here */
1084 struct FragmentMessage *fm;
1085 struct GNUNET_PeerIdentity tmpsource;
1086 const struct WlanHeader *wlanheader;
1090 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1091 ats[0].value = htonl (1);
1092 ats[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
1093 ats[1].value = htonl (GNUNET_ATS_NET_WLAN);
1094 msize = ntohs (hdr->size);
1095 switch (ntohs (hdr->type))
1097 case GNUNET_MESSAGE_TYPE_HELLO:
1099 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hdr, &tmpsource))
1101 GNUNET_break_op (0);
1104 LOG (GNUNET_ERROR_TYPE_DEBUG,
1105 "Processing %u bytes of HELLO from peer `%s' at MAC %s\n",
1106 (unsigned int) msize,
1107 GNUNET_i2s (&tmpsource),
1108 mac_to_string (&mas->endpoint->addr));
1110 GNUNET_STATISTICS_update (plugin->env->stats,
1111 _("# HELLO messages received via WLAN"), 1,
1113 plugin->env->receive (plugin->env->cls,
1118 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1119 (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1121 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1122 if (NULL == mas->endpoint)
1127 LOG (GNUNET_ERROR_TYPE_DEBUG,
1128 "Processing %u bytes of FRAGMENT from MAC %s\n",
1129 (unsigned int) msize,
1130 mac_to_string (&mas->endpoint->addr));
1131 GNUNET_STATISTICS_update (plugin->env->stats,
1132 _("# fragments received via WLAN"), 1, GNUNET_NO);
1133 (void) GNUNET_DEFRAGMENT_process_fragment (mas->endpoint->defrag,
1136 case GNUNET_MESSAGE_TYPE_FRAGMENT_ACK:
1137 if (NULL == mas->endpoint)
1142 GNUNET_STATISTICS_update (plugin->env->stats, _("# ACKs received via WLAN"),
1144 for (fm = mas->endpoint->sending_messages_head; NULL != fm; fm = fm->next)
1146 ret = GNUNET_FRAGMENT_process_ack (fm->fragcontext, hdr);
1147 if (GNUNET_OK == ret)
1149 LOG (GNUNET_ERROR_TYPE_DEBUG,
1150 "Got last ACK, finished message transmission to `%s' (%p)\n",
1151 mac_to_string (&mas->endpoint->addr),
1153 mas->endpoint->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
1154 if (NULL != fm->cont)
1156 fm->cont (fm->cont_cls, &fm->target, GNUNET_OK);
1159 free_fragment_message (fm);
1162 if (GNUNET_NO == ret)
1164 LOG (GNUNET_ERROR_TYPE_DEBUG,
1165 "Got an ACK, message transmission to `%s' not yet finished\n",
1166 mac_to_string (&mas->endpoint->addr));
1170 LOG (GNUNET_ERROR_TYPE_DEBUG,
1171 "ACK not matched against any active fragmentation with MAC `%s'\n",
1172 mac_to_string (&mas->endpoint->addr));
1174 case GNUNET_MESSAGE_TYPE_WLAN_DATA:
1175 if (NULL == mas->endpoint)
1180 if (msize < sizeof (struct WlanHeader))
1185 wlanheader = (const struct WlanHeader *) hdr;
1186 if (0 != memcmp (&wlanheader->target,
1187 plugin->env->my_identity,
1188 sizeof (struct GNUNET_PeerIdentity)))
1190 LOG (GNUNET_ERROR_TYPE_DEBUG,
1191 "WLAN data for `%s', not for me, ignoring\n",
1192 GNUNET_i2s (&wlanheader->target));
1195 if (ntohl (wlanheader->crc) !=
1196 GNUNET_CRYPTO_crc32_n (&wlanheader[1], msize - sizeof (struct WlanHeader)))
1198 GNUNET_STATISTICS_update (plugin->env->stats,
1199 _("# WLAN DATA messages discarded due to CRC32 error"), 1,
1203 xmas.endpoint = mas->endpoint;
1204 xmas.session = create_session (mas->endpoint, &wlanheader->sender);
1205 LOG (GNUNET_ERROR_TYPE_DEBUG,
1206 "Processing %u bytes of WLAN DATA from peer `%s'\n",
1207 (unsigned int) msize,
1208 GNUNET_i2s (&wlanheader->sender));
1209 (void) GNUNET_SERVER_mst_receive (plugin->wlan_header_payload_tokenizer,
1211 (const char *) &wlanheader[1],
1212 msize - sizeof (struct WlanHeader),
1213 GNUNET_YES, GNUNET_NO);
1216 if (NULL == mas->endpoint)
1221 if (NULL == mas->session)
1226 LOG (GNUNET_ERROR_TYPE_DEBUG,
1227 "Received packet with %u bytes of type %u from peer %s\n",
1228 (unsigned int) msize,
1229 (unsigned int) ntohs (hdr->type),
1230 GNUNET_i2s (&mas->session->target));
1231 plugin->env->receive (plugin->env->cls,
1232 &mas->session->target,
1236 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1237 (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1245 * Function used for to process the data from the suid process
1247 * @param cls the plugin handle
1248 * @param client client that send the data (not used)
1249 * @param hdr header of the GNUNET_MessageHeader
1252 handle_helper_message (void *cls, void *client,
1253 const struct GNUNET_MessageHeader *hdr)
1255 struct Plugin *plugin = cls;
1256 const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *rxinfo;
1257 const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *cm;
1258 struct MacAndSession mas;
1261 msize = ntohs (hdr->size);
1262 switch (ntohs (hdr->type))
1264 case GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL:
1265 if (msize != sizeof (struct GNUNET_TRANSPORT_WLAN_HelperControlMessage))
1270 cm = (const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *) hdr;
1271 if (GNUNET_YES == plugin->have_mac)
1273 if (0 == memcmp (&plugin->mac_address,
1275 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1276 break; /* no change */
1277 /* remove old address */
1278 plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
1279 &plugin->mac_address,
1280 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1282 plugin->mac_address = cm->mac;
1283 plugin->have_mac = GNUNET_YES;
1284 LOG (GNUNET_ERROR_TYPE_DEBUG,
1285 "Received WLAN_HELPER_CONTROL message with MAC address `%s' for peer `%s'\n",
1286 mac_to_string (&cm->mac),
1287 GNUNET_i2s (plugin->env->my_identity));
1288 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1289 &plugin->mac_address,
1290 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1292 case GNUNET_MESSAGE_TYPE_WLAN_DATA_FROM_HELPER:
1293 LOG (GNUNET_ERROR_TYPE_DEBUG,
1294 "Got data message from helper with %u bytes\n",
1296 GNUNET_STATISTICS_update (plugin->env->stats,
1297 _("# DATA messages received via WLAN"), 1,
1299 if (msize < sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage))
1302 LOG (GNUNET_ERROR_TYPE_DEBUG,
1303 "Size of packet is too small (%u bytes)\n",
1307 rxinfo = (const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *) hdr;
1309 /* check if message is actually for us */
1310 if (0 != memcmp (&rxinfo->frame.addr3, &mac_bssid_gnunet,
1311 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1313 /* Not the GNUnet BSSID */
1316 if ( (0 != memcmp (&rxinfo->frame.addr1, &bc_all_mac,
1317 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))) &&
1318 (0 != memcmp (&rxinfo->frame.addr1, &plugin->mac_address,
1319 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))) )
1321 /* Neither broadcast nor specifically for us */
1324 if (0 == memcmp (&rxinfo->frame.addr2, &plugin->mac_address,
1325 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1327 /* packet is FROM us, thus not FOR us */
1331 GNUNET_STATISTICS_update (plugin->env->stats,
1332 _("# WLAN DATA messages processed"),
1334 LOG (GNUNET_ERROR_TYPE_DEBUG,
1335 "Receiving %u bytes of data from MAC `%s'\n",
1336 (unsigned int) (msize - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage)),
1337 mac_to_string (&rxinfo->frame.addr2));
1338 mas.endpoint = create_macendpoint (plugin, &rxinfo->frame.addr2);
1340 (void) GNUNET_SERVER_mst_receive (plugin->helper_payload_tokenizer,
1342 (const char*) &rxinfo[1],
1343 msize - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage),
1344 GNUNET_YES, GNUNET_NO);
1348 LOG (GNUNET_ERROR_TYPE_DEBUG,
1349 "Unexpected message of type %u (%u bytes)",
1350 ntohs (hdr->type), ntohs (hdr->size));
1358 * Task to (periodically) send a HELLO beacon
1360 * @param cls pointer to the plugin struct
1361 * @param tc scheduler context
1364 send_hello_beacon (void *cls,
1365 const struct GNUNET_SCHEDULER_TaskContext *tc)
1367 struct Plugin *plugin = cls;
1369 uint16_t hello_size;
1370 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radioHeader;
1371 const struct GNUNET_MessageHeader *hello;
1373 hello = plugin->env->get_our_hello ();
1374 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
1375 GNUNET_assert (sizeof (struct WlanHeader) + hello_size <= WLAN_MTU);
1376 size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + hello_size;
1378 char buf[size] GNUNET_ALIGN;
1380 LOG (GNUNET_ERROR_TYPE_DEBUG,
1381 "Sending %u byte HELLO beacon\n",
1382 (unsigned int) size);
1383 radioHeader = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage*) buf;
1384 get_radiotap_header (NULL, radioHeader, size);
1385 get_wlan_header (plugin, &radioHeader->frame, &bc_all_mac, size);
1386 memcpy (&radioHeader[1], hello, hello_size);
1388 GNUNET_HELPER_send (plugin->suid_helper,
1389 &radioHeader->header,
1390 GNUNET_YES /* can drop */,
1392 GNUNET_STATISTICS_update (plugin->env->stats, _("# HELLO beacons sent via WLAN"),
1395 plugin->beacon_task =
1396 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
1397 (HELLO_BEACON_SCALING_FACTOR,
1398 plugin->mac_count + 1),
1406 * Another peer has suggested an address for this
1407 * peer and transport plugin. Check that this could be a valid
1408 * address. If so, consider adding it to the list
1411 * @param cls closure
1412 * @param addr pointer to the address
1413 * @param addrlen length of addr
1414 * @return GNUNET_OK if this is a plausible address for this peer
1418 wlan_plugin_address_suggested (void *cls, const void *addr, size_t addrlen)
1420 struct Plugin *plugin = cls;
1422 if (addrlen != sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))
1424 GNUNET_break_op (0);
1425 return GNUNET_SYSERR;
1427 if (GNUNET_YES != plugin->have_mac)
1429 LOG (GNUNET_ERROR_TYPE_DEBUG,
1430 "Rejecting MAC `%s': I don't know my MAC!\n",
1431 mac_to_string (addr));
1432 return GNUNET_NO; /* don't know my MAC */
1434 if (0 != memcmp (addr,
1435 &plugin->mac_address,
1438 LOG (GNUNET_ERROR_TYPE_DEBUG,
1439 "Rejecting MAC `%s': not my MAC!\n",
1440 mac_to_string (addr));
1441 return GNUNET_NO; /* not my MAC */
1448 * Function called for a quick conversion of the binary address to
1449 * a numeric address. Note that the caller must not free the
1450 * address and that the next call to this function is allowed
1451 * to override the address again.
1453 * @param cls closure
1454 * @param addr binary address
1455 * @param addrlen length of the address
1456 * @return string representing the same address
1459 wlan_plugin_address_to_string (void *cls, const void *addr, size_t addrlen)
1461 const struct GNUNET_TRANSPORT_WLAN_MacAddress *mac;
1463 if (sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress) != addrlen)
1469 return GNUNET_strdup (mac_to_string (mac));
1474 * Convert the transports address to a nice, human-readable format.
1476 * @param cls closure
1477 * @param type name of the transport that generated the address
1478 * @param addr one of the addresses of the host, NULL for the last address
1479 * the specific address format depends on the transport
1480 * @param addrlen length of the address
1481 * @param numeric should (IP) addresses be displayed in numeric form?
1482 * @param timeout after how long should we give up?
1483 * @param asc function to call on each string
1484 * @param asc_cls closure for asc
1487 wlan_plugin_address_pretty_printer (void *cls, const char *type,
1488 const void *addr, size_t addrlen,
1490 struct GNUNET_TIME_Relative timeout,
1491 GNUNET_TRANSPORT_AddressStringCallback asc,
1494 const struct GNUNET_TRANSPORT_WLAN_MacAddress *mac;
1497 if (sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress) != addrlen)
1499 /* invalid address */
1500 LOG (GNUNET_ERROR_TYPE_WARNING,
1501 _("WLAN address with invalid size encountered\n"));
1502 asc (asc_cls, NULL);
1506 ret = GNUNET_strdup (mac_to_string (mac));
1509 asc (asc_cls, NULL);
1514 * Exit point from the plugin.
1516 * @param cls pointer to the api struct
1519 libgnunet_plugin_transport_wlan_done (void *cls)
1521 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1522 struct Plugin *plugin = api->cls;
1523 struct MacEndpoint *endpoint;
1524 struct MacEndpoint *endpoint_next;
1531 if (GNUNET_SCHEDULER_NO_TASK != plugin->beacon_task)
1533 GNUNET_SCHEDULER_cancel (plugin->beacon_task);
1534 plugin->beacon_task = GNUNET_SCHEDULER_NO_TASK;
1536 if (NULL != plugin->suid_helper)
1538 GNUNET_HELPER_stop (plugin->suid_helper);
1539 plugin->suid_helper = NULL;
1541 endpoint_next = plugin->mac_head;
1542 while (NULL != (endpoint = endpoint_next))
1544 endpoint_next = endpoint->next;
1545 free_macendpoint (endpoint);
1547 if (NULL != plugin->fragment_data_tokenizer)
1549 GNUNET_SERVER_mst_destroy (plugin->fragment_data_tokenizer);
1550 plugin->fragment_data_tokenizer = NULL;
1552 if (NULL != plugin->wlan_header_payload_tokenizer)
1554 GNUNET_SERVER_mst_destroy (plugin->wlan_header_payload_tokenizer);
1555 plugin->wlan_header_payload_tokenizer = NULL;
1557 if (NULL != plugin->helper_payload_tokenizer)
1559 GNUNET_SERVER_mst_destroy (plugin->helper_payload_tokenizer);
1560 plugin->helper_payload_tokenizer = NULL;
1562 GNUNET_free_non_null (plugin->interface);
1563 GNUNET_free (plugin);
1570 * Function called to convert a string address to
1573 * @param cls closure ('struct Plugin*')
1574 * @param addr string address
1575 * @param addrlen length of the address
1576 * @param buf location to store the buffer
1577 * @param added location to store the number of bytes in the buffer.
1578 * If the function returns GNUNET_SYSERR, its contents are undefined.
1579 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
1582 wlan_string_to_address (void *cls, const char *addr, uint16_t addrlen,
1583 void **buf, size_t *added)
1585 struct GNUNET_TRANSPORT_WLAN_MacAddress *mac;
1589 if ((NULL == addr) || (addrlen == 0))
1592 return GNUNET_SYSERR;
1594 if ('\0' != addr[addrlen - 1])
1597 return GNUNET_SYSERR;
1599 if (strlen (addr) != addrlen - 1)
1602 return GNUNET_SYSERR;
1604 if (6 != SSCANF (addr,
1605 "%X:%X:%X:%X:%X:%X",
1606 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]))
1609 return GNUNET_SYSERR;
1611 mac = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1615 *added = sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress);
1621 * Entry point for the plugin.
1623 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
1624 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
1627 libgnunet_plugin_transport_wlan_init (void *cls)
1629 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1630 struct GNUNET_TRANSPORT_PluginFunctions *api;
1631 struct Plugin *plugin;
1633 unsigned long long testmode;
1635 /* check for 'special' mode */
1636 if (NULL == env->receive)
1638 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1639 initialze the plugin or the API */
1640 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1642 api->address_pretty_printer = &wlan_plugin_address_pretty_printer;
1643 api->address_to_string = &wlan_plugin_address_to_string;
1644 api->string_to_address = &wlan_string_to_address;
1649 /* check configuration */
1651 GNUNET_CONFIGURATION_have_value (env->cfg, "transport-wlan", "TESTMODE")) &&
1653 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-wlan",
1654 "TESTMODE", &testmode)) ||
1657 LOG (GNUNET_ERROR_TYPE_ERROR,
1658 _("Invalid configuration option `%s' in section `%s'\n"),
1663 if ( (0 == testmode) &&
1664 (GNUNET_YES != GNUNET_OS_check_helper_binary ("gnunet-helper-transport-wlan")) )
1666 LOG (GNUNET_ERROR_TYPE_ERROR,
1667 _("Helper binary `%s' not SUID, cannot run WLAN transport\n"),
1668 "gnunet-helper-transport-wlan");
1672 GNUNET_CONFIGURATION_get_value_string
1673 (env->cfg, "transport-wlan", "INTERFACE",
1676 LOG (GNUNET_ERROR_TYPE_ERROR,
1677 _("Missing configuration option `%s' in section `%s'\n"),
1683 plugin = GNUNET_malloc (sizeof (struct Plugin));
1684 plugin->interface = interface;
1686 GNUNET_STATISTICS_set (plugin->env->stats, _("# WLAN sessions allocated"),
1688 GNUNET_STATISTICS_set (plugin->env->stats, _("# WLAN MAC endpoints allocated"),
1690 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1691 GNUNET_BANDWIDTH_value_init (100 * 1024 *
1693 plugin->fragment_data_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1694 plugin->wlan_header_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1695 plugin->helper_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1696 plugin->beacon_task = GNUNET_SCHEDULER_add_now (&send_hello_beacon,
1700 case 0: /* normal */
1701 plugin->helper_argv[0] = (char *) "gnunet-helper-transport-wlan";
1702 plugin->helper_argv[1] = interface;
1703 plugin->helper_argv[2] = NULL;
1704 plugin->suid_helper = GNUNET_HELPER_start ("gnunet-helper-transport-wlan",
1705 plugin->helper_argv,
1706 &handle_helper_message,
1709 case 1: /* testmode, peer 1 */
1710 plugin->helper_argv[0] = (char *) "gnunet-helper-transport-wlan-dummy";
1711 plugin->helper_argv[1] = (char *) "1";
1712 plugin->helper_argv[2] = NULL;
1713 plugin->suid_helper = GNUNET_HELPER_start ("gnunet-helper-transport-wlan-dummy",
1714 plugin->helper_argv,
1715 &handle_helper_message,
1718 case 2: /* testmode, peer 2 */
1719 plugin->helper_argv[0] = (char *) "gnunet-helper-transport-wlan-dummy";
1720 plugin->helper_argv[1] = (char *) "2";
1721 plugin->helper_argv[2] = NULL;
1722 plugin->suid_helper = GNUNET_HELPER_start ("gnunet-helper-transport-wlan-dummy",
1723 plugin->helper_argv,
1724 &handle_helper_message,
1731 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1733 api->send = &wlan_plugin_send;
1734 api->get_session = &wlan_plugin_get_session;
1735 api->disconnect = &wlan_plugin_disconnect;
1736 api->address_pretty_printer = &wlan_plugin_address_pretty_printer;
1737 api->check_address = &wlan_plugin_address_suggested;
1738 api->address_to_string = &wlan_plugin_address_to_string;
1739 api->string_to_address = &wlan_string_to_address;
1744 /* end of plugin_transport_wlan.c */