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.
156 * To whom are we talking to (set to our identity
157 * if we are still waiting for the welcome message)
159 struct GNUNET_PeerIdentity target;
162 * API requirement (must be first).
164 struct SessionHeader header;
167 * We keep all sessions in a DLL at their respective
168 * 'struct MACEndpoint'.
170 struct Session *next;
173 * We keep all sessions in a DLL at their respective
174 * 'struct MACEndpoint'.
176 struct Session *prev;
179 * MAC endpoint with the address of this peer.
181 struct MacEndpoint *mac;
184 * Head of messages currently pending for transmission to this peer.
186 struct PendingMessage *pending_message_head;
189 * Tail of messages currently pending for transmission to this peer.
191 struct PendingMessage *pending_message_tail;
194 * When should this session time out?
196 struct GNUNET_TIME_Absolute timeout;
199 * Timeout task (for the session).
201 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
207 * Struct for messages that are being fragmented in a MAC's transmission queue.
209 struct FragmentMessage
213 * This is a doubly-linked list.
215 struct FragmentMessage *next;
218 * This is a doubly-linked list.
220 struct FragmentMessage *prev;
223 * MAC endpoint this message belongs to
225 struct MacEndpoint *macendpoint;
228 * Fragmentation context
230 struct GNUNET_FRAGMENT_Context *fragcontext;
233 * Transmission handle to helper (to cancel if the frag context
234 * is destroyed early for some reason).
236 struct GNUNET_HELPER_SendHandle *sh;
239 * Intended recipient.
241 struct GNUNET_PeerIdentity target;
244 * Timeout value for the message.
246 struct GNUNET_TIME_Absolute timeout;
251 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
254 * Continuation to call when we're done with this message.
256 GNUNET_TRANSPORT_TransmitContinuation cont;
267 * Struct to represent one network card connection
273 * We keep all MACs in a DLL in the plugin.
275 struct MacEndpoint *next;
278 * We keep all MACs in a DLL in the plugin.
280 struct MacEndpoint *prev;
283 * Pointer to the global plugin struct.
285 struct Plugin *plugin;
288 * Head of sessions that use this MAC.
290 struct Session *sessions_head;
293 * Tail of sessions that use this MAC.
295 struct Session *sessions_tail;
298 * Head of messages we are currently sending to this MAC.
300 struct FragmentMessage *sending_messages_head;
303 * Tail of messages we are currently sending to this MAC.
305 struct FragmentMessage *sending_messages_tail;
308 * Defrag context for this MAC
310 struct GNUNET_DEFRAGMENT_Context *defrag;
313 * When should this endpoint time out?
315 struct GNUNET_TIME_Absolute timeout;
320 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
323 * count of messages in the fragment out queue for this mac endpoint
325 unsigned int fragment_messages_out_count;
330 struct GNUNET_TRANSPORT_WLAN_MacAddress addr;
333 * Desired transmission power for this MAC
338 * Desired transmission rate for this MAC
343 * Antenna we should use for this MAC
351 * Encapsulation of all of the state of the plugin.
358 struct GNUNET_TRANSPORT_PluginEnvironment *env;
361 * Handle to helper process for priviledged operations.
363 struct GNUNET_HELPER_Handle *suid_helper;
366 * ARGV-vector for the helper (all helpers take only the binary
367 * name, one actual argument, plus the NULL terminator for 'argv').
369 char * helper_argv[3];
372 * The interface of the wlan card given to us by the user.
377 * Tokenizer for demultiplexing of data packets resulting from defragmentation.
379 struct GNUNET_SERVER_MessageStreamTokenizer *fragment_data_tokenizer;
382 * Tokenizer for demultiplexing of data packets received from the suid helper
384 struct GNUNET_SERVER_MessageStreamTokenizer *helper_payload_tokenizer;
387 * Tokenizer for demultiplexing of data packets that follow the WLAN Header
389 struct GNUNET_SERVER_MessageStreamTokenizer *wlan_header_payload_tokenizer;
392 * Head of list of open connections.
394 struct MacEndpoint *mac_head;
397 * Tail of list of open connections.
399 struct MacEndpoint *mac_tail;
402 * Number of connections
404 unsigned int mac_count;
407 * Task that periodically sends a HELLO beacon via the helper.
409 GNUNET_SCHEDULER_TaskIdentifier beacon_task;
412 * Tracker for bandwidth limit
414 struct GNUNET_BANDWIDTH_Tracker tracker;
417 * The mac_address of the wlan card given to us by the helper.
419 struct GNUNET_TRANSPORT_WLAN_MacAddress mac_address;
422 * Have we received a control message with our MAC address yet?
431 * Information associated with a message. Can contain
432 * the session or the MAC endpoint associated with the
438 * NULL if the identity of the other peer is not known.
440 struct Session *session;
443 * MAC address of the other peer, NULL if not known.
445 struct MacEndpoint *endpoint;
450 * Print MAC addresses nicely.
452 * @param mac the mac address
453 * @return string to a static buffer with the human-readable mac, will be overwritten during the next call to this function
456 mac_to_string (const struct GNUNET_TRANSPORT_WLAN_MacAddress * mac)
458 static char macstr[20];
460 GNUNET_snprintf (macstr, sizeof (macstr), "%.2X:%.2X:%.2X:%.2X:%.2X:%.2X", mac->mac[0], mac->mac[1],
461 mac->mac[2], mac->mac[3], mac->mac[4], mac->mac[5]);
467 * Fill the radiotap header
469 * @param endpoint pointer to the endpoint, can be NULL
470 * @param header pointer to the radiotap header
471 * @param size total message size
474 get_radiotap_header (struct MacEndpoint *endpoint,
475 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *header,
478 header->header.type = ntohs (GNUNET_MESSAGE_TYPE_WLAN_DATA_TO_HELPER);
479 header->header.size = ntohs (size);
480 if (NULL != endpoint)
482 header->rate = endpoint->rate;
483 header->tx_power = endpoint->tx_power;
484 header->antenna = endpoint->antenna;
489 header->tx_power = 0;
496 * Generate the WLAN hardware header for one packet
498 * @param plugin the plugin handle
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;
711 GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
716 * Transmit a fragment of a message.
718 * @param cls 'struct FragmentMessage' this fragment message belongs to
719 * @param hdr pointer to the start of the fragment message
722 transmit_fragment (void *cls,
723 const struct GNUNET_MessageHeader *hdr)
725 struct FragmentMessage *fm = cls;
726 struct MacEndpoint *endpoint = fm->macendpoint;
730 msize = ntohs (hdr->size);
731 size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + msize;
734 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radio_header;
736 radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
737 get_radiotap_header (endpoint, radio_header, size);
738 get_wlan_header (endpoint->plugin,
739 &radio_header->frame,
742 memcpy (&radio_header[1], hdr, msize);
743 GNUNET_assert (NULL == fm->sh);
744 fm->sh = GNUNET_HELPER_send (endpoint->plugin->suid_helper,
745 &radio_header->header,
747 &fragment_transmission_done, fm);
749 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN message fragments sent"),
752 GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
753 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
754 "# bytes currently in WLAN buffers",
756 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
757 "# bytes transmitted via WLAN",
764 * Frees the space of a message in the fragment queue (send queue)
766 * @param fm message to free
769 free_fragment_message (struct FragmentMessage *fm)
771 struct MacEndpoint *endpoint = fm->macendpoint;
773 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN messages pending (with fragmentation)"),
775 GNUNET_CONTAINER_DLL_remove (endpoint->sending_messages_head,
776 endpoint->sending_messages_tail, fm);
779 GNUNET_HELPER_send_cancel (fm->sh);
782 GNUNET_FRAGMENT_context_destroy (fm->fragcontext);
783 if (fm->timeout_task != GNUNET_SCHEDULER_NO_TASK)
785 GNUNET_SCHEDULER_cancel (fm->timeout_task);
786 fm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
793 * A FragmentMessage has timed out. Remove it.
795 * @param cls pointer to the 'struct FragmentMessage'
796 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
799 fragmentmessage_timeout (void *cls,
800 const struct GNUNET_SCHEDULER_TaskContext *tc)
802 struct FragmentMessage *fm = cls;
804 fm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
805 if (NULL != fm->cont)
807 fm->cont (fm->cont_cls, &fm->target, GNUNET_SYSERR);
810 free_fragment_message (fm);
815 * Transmit a message to the given destination with fragmentation.
817 * @param endpoint desired destination
818 * @param timeout how long can the message wait?
819 * @param target peer that should receive the message
820 * @param msg message to transmit
821 * @param cont continuation to call once the message has
822 * been transmitted (or if the transport is ready
823 * for the next transmission call; or if the
824 * peer disconnected...); can be NULL
825 * @param cont_cls closure for cont
828 send_with_fragmentation (struct MacEndpoint *endpoint,
829 struct GNUNET_TIME_Relative timeout,
830 const struct GNUNET_PeerIdentity *target,
831 const struct GNUNET_MessageHeader *msg,
832 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
835 struct FragmentMessage *fm;
836 struct Plugin *plugin;
838 plugin = endpoint->plugin;
839 fm = GNUNET_malloc (sizeof (struct FragmentMessage));
840 fm->macendpoint = endpoint;
841 fm->target = *target;
842 fm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
844 fm->cont_cls = cont_cls;
846 GNUNET_FRAGMENT_context_create (plugin->env->stats, WLAN_MTU,
848 GNUNET_TIME_UNIT_SECONDS,
850 &transmit_fragment, fm);
852 GNUNET_SCHEDULER_add_delayed (timeout,
853 &fragmentmessage_timeout, fm);
854 GNUNET_CONTAINER_DLL_insert_tail (endpoint->sending_messages_head,
855 endpoint->sending_messages_tail,
861 * Free a MAC endpoint.
863 * @param endpoint pointer to the MacEndpoint to free
866 free_macendpoint (struct MacEndpoint *endpoint)
868 struct Plugin *plugin = endpoint->plugin;
869 struct FragmentMessage *fm;
870 struct Session *session;
872 GNUNET_STATISTICS_update (plugin->env->stats,
873 _("# WLAN MAC endpoints allocated"), -1, GNUNET_NO);
874 while (NULL != (session = endpoint->sessions_head))
875 free_session (session);
876 while (NULL != (fm = endpoint->sending_messages_head))
877 free_fragment_message (fm);
878 GNUNET_CONTAINER_DLL_remove (plugin->mac_head,
882 if (NULL != endpoint->defrag)
884 GNUNET_DEFRAGMENT_context_destroy(endpoint->defrag);
885 endpoint->defrag = NULL;
889 if (GNUNET_SCHEDULER_NO_TASK != endpoint->timeout_task)
891 GNUNET_SCHEDULER_cancel (endpoint->timeout_task);
892 endpoint->timeout_task = GNUNET_SCHEDULER_NO_TASK;
894 GNUNET_free (endpoint);
899 * A MAC endpoint is timing out. Clean up.
901 * @param cls pointer to the MacEndpoint
902 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
905 macendpoint_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
907 struct MacEndpoint *endpoint = cls;
908 struct GNUNET_TIME_Relative timeout;
910 endpoint->timeout_task = GNUNET_SCHEDULER_NO_TASK;
911 timeout = GNUNET_TIME_absolute_get_remaining (endpoint->timeout);
912 if (0 == timeout.rel_value)
914 free_macendpoint (endpoint);
917 endpoint->timeout_task =
918 GNUNET_SCHEDULER_add_delayed (timeout, &macendpoint_timeout,
924 * Find (or create) a MacEndpoint with a specific MAC address
926 * @param plugin pointer to the plugin struct
927 * @param addr the MAC address of the endpoint
928 * @return handle to our data structure for this MAC
930 static struct MacEndpoint *
931 create_macendpoint (struct Plugin *plugin,
932 const struct GNUNET_TRANSPORT_WLAN_MacAddress *addr)
934 struct MacEndpoint *pos;
936 for (pos = plugin->mac_head; NULL != pos; pos = pos->next)
937 if (0 == memcmp (addr, &pos->addr, sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
939 pos = GNUNET_malloc (sizeof (struct MacEndpoint));
941 pos->plugin = plugin;
943 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, WLAN_MTU,
944 MESSAGES_IN_DEFRAG_QUEUE_PER_MAC,
946 &wlan_data_message_handler,
948 pos->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
950 GNUNET_SCHEDULER_add_delayed (MACENDPOINT_TIMEOUT, &macendpoint_timeout,
952 GNUNET_CONTAINER_DLL_insert (plugin->mac_head, plugin->mac_tail, pos);
954 GNUNET_STATISTICS_update (plugin->env->stats, _("# WLAN MAC endpoints allocated"),
956 LOG (GNUNET_ERROR_TYPE_DEBUG,
957 "New MAC endpoint `%s'\n",
958 mac_to_string (addr));
964 * Creates a new outbound session the transport service will use to send data to the
967 * @param cls the plugin
968 * @param address the address
969 * @return the session or NULL of max connections exceeded
971 static struct Session *
972 wlan_plugin_get_session (void *cls,
973 const struct GNUNET_HELLO_Address *address)
975 struct Plugin *plugin = cls;
976 struct MacEndpoint *endpoint;
980 if (sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress) != address->address_length)
985 LOG (GNUNET_ERROR_TYPE_DEBUG,
986 "Service asked to create session for peer `%s' with MAC `%s'\n",
987 GNUNET_i2s (&address->peer),
988 mac_to_string (address->address));
989 endpoint = create_macendpoint (plugin, address->address);
990 return create_session (endpoint, &address->peer);
995 * Function that can be used to force the plugin to disconnect
996 * from the given peer and cancel all previous transmissions
997 * (and their continuation).
1000 * @param target peer from which to disconnect
1003 wlan_plugin_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
1005 struct Plugin *plugin = cls;
1006 struct Session *session;
1007 struct MacEndpoint *endpoint;
1009 for (endpoint = plugin->mac_head; NULL != endpoint; endpoint = endpoint->next)
1010 for (session = endpoint->sessions_head; NULL != session; session = session->next)
1011 if (0 == memcmp (target, &session->target,
1012 sizeof (struct GNUNET_PeerIdentity)))
1014 free_session (session);
1015 break; /* inner-loop only (in case peer has another MAC as well!) */
1021 * Function that can be used by the transport service to transmit
1022 * a message using the plugin. Note that in the case of a
1023 * peer disconnecting, the continuation MUST be called
1024 * prior to the disconnect notification itself. This function
1025 * will be called with this peer's HELLO message to initiate
1026 * a fresh connection to another peer.
1028 * @param cls closure
1029 * @param session which session must be used
1030 * @param msgbuf the message to transmit
1031 * @param msgbuf_size number of bytes in 'msgbuf'
1032 * @param priority how important is the message (most plugins will
1033 * ignore message priority and just FIFO)
1034 * @param to how long to wait at most for the transmission (does not
1035 * require plugins to discard the message after the timeout,
1036 * just advisory for the desired delay; most plugins will ignore
1038 * @param cont continuation to call once the message has
1039 * been transmitted (or if the transport is ready
1040 * for the next transmission call; or if the
1041 * peer disconnected...); can be NULL
1042 * @param cont_cls closure for cont
1043 * @return number of bytes used (on the physical network, with overheads);
1044 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1045 * and does NOT mean that the message was not transmitted (DV)
1048 wlan_plugin_send (void *cls,
1049 struct Session *session,
1050 const char *msgbuf, size_t msgbuf_size,
1051 unsigned int priority,
1052 struct GNUNET_TIME_Relative to,
1053 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1055 struct Plugin *plugin = cls;
1056 struct WlanHeader *wlanheader;
1057 size_t size = msgbuf_size + sizeof (struct WlanHeader);
1058 char buf[size] GNUNET_ALIGN;
1060 LOG (GNUNET_ERROR_TYPE_DEBUG,
1061 "Transmitting %u bytes of payload to peer `%s' (starting with %u byte message of type %u)\n",
1063 GNUNET_i2s (&session->target),
1064 (unsigned int) ntohs (((struct GNUNET_MessageHeader*)msgbuf)->size),
1065 (unsigned int) ntohs (((struct GNUNET_MessageHeader*)msgbuf)->type));
1066 wlanheader = (struct WlanHeader *) buf;
1067 wlanheader->header.size = htons (msgbuf_size + sizeof (struct WlanHeader));
1068 wlanheader->header.type = htons (GNUNET_MESSAGE_TYPE_WLAN_DATA);
1069 wlanheader->sender = *plugin->env->my_identity;
1070 wlanheader->target = session->target;
1071 wlanheader->crc = htonl (GNUNET_CRYPTO_crc32_n (msgbuf, msgbuf_size));
1072 memcpy (&wlanheader[1], msgbuf, msgbuf_size);
1074 GNUNET_STATISTICS_update (plugin->env->stats,
1075 "# bytes currently in WLAN buffers",
1076 msgbuf_size, GNUNET_NO);
1078 send_with_fragmentation (session->mac,
1081 &wlanheader->header,
1088 * We have received data from the WLAN via some session. Process depending
1089 * on the message type (HELLO, DATA, FRAGMENTATION or FRAGMENTATION-ACK).
1091 * @param cls pointer to the plugin
1092 * @param client pointer to the session this message belongs to
1093 * @param hdr start of the message
1096 process_data (void *cls, void *client, const struct GNUNET_MessageHeader *hdr)
1098 struct Plugin *plugin = cls;
1099 struct MacAndSession *mas = client;
1100 struct MacAndSession xmas;
1102 struct GNUNET_ATS_Information ats[NUM_ATS]; /* FIXME: do better here */
1103 struct FragmentMessage *fm;
1104 struct GNUNET_PeerIdentity tmpsource;
1105 const struct WlanHeader *wlanheader;
1109 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1110 ats[0].value = htonl (1);
1111 ats[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
1112 ats[1].value = htonl (GNUNET_ATS_NET_WLAN);
1113 msize = ntohs (hdr->size);
1115 GNUNET_STATISTICS_update (plugin->env->stats,
1116 "# bytes received via WLAN",
1119 switch (ntohs (hdr->type))
1121 case GNUNET_MESSAGE_TYPE_HELLO:
1123 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hdr, &tmpsource))
1125 GNUNET_break_op (0);
1128 LOG (GNUNET_ERROR_TYPE_DEBUG,
1129 "Processing %u bytes of HELLO from peer `%s' at MAC %s\n",
1130 (unsigned int) msize,
1131 GNUNET_i2s (&tmpsource),
1132 mac_to_string (&mas->endpoint->addr));
1134 GNUNET_STATISTICS_update (plugin->env->stats,
1135 _("# HELLO messages received via WLAN"), 1,
1137 plugin->env->receive (plugin->env->cls,
1142 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1143 (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1145 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1146 if (NULL == mas->endpoint)
1151 LOG (GNUNET_ERROR_TYPE_DEBUG,
1152 "Processing %u bytes of FRAGMENT from MAC %s\n",
1153 (unsigned int) msize,
1154 mac_to_string (&mas->endpoint->addr));
1155 GNUNET_STATISTICS_update (plugin->env->stats,
1156 _("# fragments received via WLAN"), 1, GNUNET_NO);
1157 (void) GNUNET_DEFRAGMENT_process_fragment (mas->endpoint->defrag,
1160 case GNUNET_MESSAGE_TYPE_FRAGMENT_ACK:
1161 if (NULL == mas->endpoint)
1166 GNUNET_STATISTICS_update (plugin->env->stats, _("# ACKs received via WLAN"),
1168 for (fm = mas->endpoint->sending_messages_head; NULL != fm; fm = fm->next)
1170 ret = GNUNET_FRAGMENT_process_ack (fm->fragcontext, hdr);
1171 if (GNUNET_OK == ret)
1173 LOG (GNUNET_ERROR_TYPE_DEBUG,
1174 "Got last ACK, finished message transmission to `%s' (%p)\n",
1175 mac_to_string (&mas->endpoint->addr),
1177 mas->endpoint->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
1178 if (NULL != fm->cont)
1180 fm->cont (fm->cont_cls, &fm->target, GNUNET_OK);
1183 free_fragment_message (fm);
1186 if (GNUNET_NO == ret)
1188 LOG (GNUNET_ERROR_TYPE_DEBUG,
1189 "Got an ACK, message transmission to `%s' not yet finished\n",
1190 mac_to_string (&mas->endpoint->addr));
1194 LOG (GNUNET_ERROR_TYPE_DEBUG,
1195 "ACK not matched against any active fragmentation with MAC `%s'\n",
1196 mac_to_string (&mas->endpoint->addr));
1198 case GNUNET_MESSAGE_TYPE_WLAN_DATA:
1199 if (NULL == mas->endpoint)
1204 if (msize < sizeof (struct WlanHeader))
1209 wlanheader = (const struct WlanHeader *) hdr;
1210 if (0 != memcmp (&wlanheader->target,
1211 plugin->env->my_identity,
1212 sizeof (struct GNUNET_PeerIdentity)))
1214 LOG (GNUNET_ERROR_TYPE_DEBUG,
1215 "WLAN data for `%s', not for me, ignoring\n",
1216 GNUNET_i2s (&wlanheader->target));
1219 if (ntohl (wlanheader->crc) !=
1220 GNUNET_CRYPTO_crc32_n (&wlanheader[1], msize - sizeof (struct WlanHeader)))
1222 GNUNET_STATISTICS_update (plugin->env->stats,
1223 _("# WLAN DATA messages discarded due to CRC32 error"), 1,
1227 xmas.endpoint = mas->endpoint;
1228 xmas.session = create_session (mas->endpoint, &wlanheader->sender);
1229 LOG (GNUNET_ERROR_TYPE_DEBUG,
1230 "Processing %u bytes of WLAN DATA from peer `%s'\n",
1231 (unsigned int) msize,
1232 GNUNET_i2s (&wlanheader->sender));
1233 (void) GNUNET_SERVER_mst_receive (plugin->wlan_header_payload_tokenizer,
1235 (const char *) &wlanheader[1],
1236 msize - sizeof (struct WlanHeader),
1237 GNUNET_YES, GNUNET_NO);
1240 if (NULL == mas->endpoint)
1245 if (NULL == mas->session)
1250 LOG (GNUNET_ERROR_TYPE_DEBUG,
1251 "Received packet with %u bytes of type %u from peer %s\n",
1252 (unsigned int) msize,
1253 (unsigned int) ntohs (hdr->type),
1254 GNUNET_i2s (&mas->session->target));
1255 plugin->env->receive (plugin->env->cls,
1256 &mas->session->target,
1260 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1261 (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1270 * Function used for to process the data from the suid process
1272 * @param cls the plugin handle
1273 * @param client client that send the data (not used)
1274 * @param hdr header of the GNUNET_MessageHeader
1277 handle_helper_message (void *cls, void *client,
1278 const struct GNUNET_MessageHeader *hdr)
1280 struct Plugin *plugin = cls;
1281 const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *rxinfo;
1282 const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *cm;
1283 struct MacAndSession mas;
1286 msize = ntohs (hdr->size);
1287 switch (ntohs (hdr->type))
1289 case GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL:
1290 if (msize != sizeof (struct GNUNET_TRANSPORT_WLAN_HelperControlMessage))
1295 cm = (const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *) hdr;
1296 if (GNUNET_YES == plugin->have_mac)
1298 if (0 == memcmp (&plugin->mac_address,
1300 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1301 break; /* no change */
1302 /* remove old address */
1303 plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
1304 &plugin->mac_address,
1305 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress),
1308 plugin->mac_address = cm->mac;
1309 plugin->have_mac = GNUNET_YES;
1310 LOG (GNUNET_ERROR_TYPE_DEBUG,
1311 "Received WLAN_HELPER_CONTROL message with MAC address `%s' for peer `%s'\n",
1312 mac_to_string (&cm->mac),
1313 GNUNET_i2s (plugin->env->my_identity));
1314 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1315 &plugin->mac_address,
1316 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress),
1319 case GNUNET_MESSAGE_TYPE_WLAN_DATA_FROM_HELPER:
1320 LOG (GNUNET_ERROR_TYPE_DEBUG,
1321 "Got data message from helper with %u bytes\n",
1323 GNUNET_STATISTICS_update (plugin->env->stats,
1324 _("# DATA messages received via WLAN"), 1,
1326 if (msize < sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage))
1329 LOG (GNUNET_ERROR_TYPE_DEBUG,
1330 "Size of packet is too small (%u bytes)\n",
1334 rxinfo = (const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *) hdr;
1336 /* check if message is actually for us */
1337 if (0 != memcmp (&rxinfo->frame.addr3, &mac_bssid_gnunet,
1338 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1340 /* Not the GNUnet BSSID */
1343 if ( (0 != memcmp (&rxinfo->frame.addr1, &bc_all_mac,
1344 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))) &&
1345 (0 != memcmp (&rxinfo->frame.addr1, &plugin->mac_address,
1346 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))) )
1348 /* Neither broadcast nor specifically for us */
1351 if (0 == memcmp (&rxinfo->frame.addr2, &plugin->mac_address,
1352 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1354 /* packet is FROM us, thus not FOR us */
1358 GNUNET_STATISTICS_update (plugin->env->stats,
1359 _("# WLAN DATA messages processed"),
1361 LOG (GNUNET_ERROR_TYPE_DEBUG,
1362 "Receiving %u bytes of data from MAC `%s'\n",
1363 (unsigned int) (msize - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage)),
1364 mac_to_string (&rxinfo->frame.addr2));
1365 mas.endpoint = create_macendpoint (plugin, &rxinfo->frame.addr2);
1367 (void) GNUNET_SERVER_mst_receive (plugin->helper_payload_tokenizer,
1369 (const char*) &rxinfo[1],
1370 msize - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage),
1371 GNUNET_YES, GNUNET_NO);
1375 LOG (GNUNET_ERROR_TYPE_DEBUG,
1376 "Unexpected message of type %u (%u bytes)",
1377 ntohs (hdr->type), ntohs (hdr->size));
1386 * Task to (periodically) send a HELLO beacon
1388 * @param cls pointer to the plugin struct
1389 * @param tc scheduler context
1392 send_hello_beacon (void *cls,
1393 const struct GNUNET_SCHEDULER_TaskContext *tc)
1395 struct Plugin *plugin = cls;
1397 uint16_t hello_size;
1398 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radioHeader;
1399 const struct GNUNET_MessageHeader *hello;
1401 hello = plugin->env->get_our_hello ();
1402 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
1403 GNUNET_assert (sizeof (struct WlanHeader) + hello_size <= WLAN_MTU);
1404 size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + hello_size;
1406 char buf[size] GNUNET_ALIGN;
1408 LOG (GNUNET_ERROR_TYPE_DEBUG,
1409 "Sending %u byte HELLO beacon\n",
1410 (unsigned int) size);
1411 radioHeader = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage*) buf;
1412 get_radiotap_header (NULL, radioHeader, size);
1413 get_wlan_header (plugin, &radioHeader->frame, &bc_all_mac, size);
1414 memcpy (&radioHeader[1], hello, hello_size);
1416 GNUNET_HELPER_send (plugin->suid_helper,
1417 &radioHeader->header,
1418 GNUNET_YES /* can drop */,
1420 GNUNET_STATISTICS_update (plugin->env->stats, _("# HELLO beacons sent via WLAN"),
1423 plugin->beacon_task =
1424 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
1425 (HELLO_BEACON_SCALING_FACTOR,
1426 plugin->mac_count + 1),
1434 * Another peer has suggested an address for this
1435 * peer and transport plugin. Check that this could be a valid
1436 * address. If so, consider adding it to the list
1439 * @param cls closure
1440 * @param addr pointer to the address
1441 * @param addrlen length of addr
1442 * @return GNUNET_OK if this is a plausible address for this peer
1446 wlan_plugin_address_suggested (void *cls, const void *addr, size_t addrlen)
1448 struct Plugin *plugin = cls;
1450 if (addrlen != sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))
1452 GNUNET_break_op (0);
1453 return GNUNET_SYSERR;
1455 if (GNUNET_YES != plugin->have_mac)
1457 LOG (GNUNET_ERROR_TYPE_DEBUG,
1458 "Rejecting MAC `%s': I don't know my MAC!\n",
1459 mac_to_string (addr));
1460 return GNUNET_NO; /* don't know my MAC */
1462 if (0 != memcmp (addr,
1463 &plugin->mac_address,
1466 LOG (GNUNET_ERROR_TYPE_DEBUG,
1467 "Rejecting MAC `%s': not my MAC!\n",
1468 mac_to_string (addr));
1469 return GNUNET_NO; /* not my MAC */
1476 * Function called for a quick conversion of the binary address to
1477 * a numeric address. Note that the caller must not free the
1478 * address and that the next call to this function is allowed
1479 * to override the address again.
1481 * @param cls closure
1482 * @param addr binary address
1483 * @param addrlen length of the address
1484 * @return string representing the same address
1487 wlan_plugin_address_to_string (void *cls, const void *addr, size_t addrlen)
1489 const struct GNUNET_TRANSPORT_WLAN_MacAddress *mac;
1491 if (sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress) != addrlen)
1497 return mac_to_string (mac);
1502 * Convert the transports address to a nice, human-readable format.
1504 * @param cls closure
1505 * @param type name of the transport that generated the address
1506 * @param addr one of the addresses of the host, NULL for the last address
1507 * the specific address format depends on the transport
1508 * @param addrlen length of the address
1509 * @param numeric should (IP) addresses be displayed in numeric form?
1510 * @param timeout after how long should we give up?
1511 * @param asc function to call on each string
1512 * @param asc_cls closure for asc
1515 wlan_plugin_address_pretty_printer (void *cls, const char *type,
1516 const void *addr, size_t addrlen,
1518 struct GNUNET_TIME_Relative timeout,
1519 GNUNET_TRANSPORT_AddressStringCallback asc,
1522 const struct GNUNET_TRANSPORT_WLAN_MacAddress *mac;
1525 if (sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress) != addrlen)
1527 /* invalid address */
1528 LOG (GNUNET_ERROR_TYPE_WARNING,
1529 _("WLAN address with invalid size encountered\n"));
1530 asc (asc_cls, NULL);
1534 ret = GNUNET_strdup (mac_to_string (mac));
1537 asc (asc_cls, NULL);
1542 * Exit point from the plugin.
1544 * @param cls pointer to the api struct
1547 libgnunet_plugin_transport_wlan_done (void *cls)
1549 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1550 struct Plugin *plugin = api->cls;
1551 struct MacEndpoint *endpoint;
1552 struct MacEndpoint *endpoint_next;
1560 if (GNUNET_YES == plugin->have_mac)
1562 plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
1563 &plugin->mac_address,
1564 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress),
1566 plugin->have_mac = GNUNET_NO;
1569 if (GNUNET_SCHEDULER_NO_TASK != plugin->beacon_task)
1571 GNUNET_SCHEDULER_cancel (plugin->beacon_task);
1572 plugin->beacon_task = GNUNET_SCHEDULER_NO_TASK;
1574 if (NULL != plugin->suid_helper)
1576 GNUNET_HELPER_stop (plugin->suid_helper);
1577 plugin->suid_helper = NULL;
1579 endpoint_next = plugin->mac_head;
1580 while (NULL != (endpoint = endpoint_next))
1582 endpoint_next = endpoint->next;
1583 free_macendpoint (endpoint);
1585 if (NULL != plugin->fragment_data_tokenizer)
1587 GNUNET_SERVER_mst_destroy (plugin->fragment_data_tokenizer);
1588 plugin->fragment_data_tokenizer = NULL;
1590 if (NULL != plugin->wlan_header_payload_tokenizer)
1592 GNUNET_SERVER_mst_destroy (plugin->wlan_header_payload_tokenizer);
1593 plugin->wlan_header_payload_tokenizer = NULL;
1595 if (NULL != plugin->helper_payload_tokenizer)
1597 GNUNET_SERVER_mst_destroy (plugin->helper_payload_tokenizer);
1598 plugin->helper_payload_tokenizer = NULL;
1600 GNUNET_free_non_null (plugin->interface);
1601 GNUNET_free (plugin);
1608 * Function called to convert a string address to
1611 * @param cls closure ('struct Plugin*')
1612 * @param addr string address
1613 * @param addrlen length of the address
1614 * @param buf location to store the buffer
1615 * @param added location to store the number of bytes in the buffer.
1616 * If the function returns GNUNET_SYSERR, its contents are undefined.
1617 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
1620 wlan_string_to_address (void *cls, const char *addr, uint16_t addrlen,
1621 void **buf, size_t *added)
1623 struct GNUNET_TRANSPORT_WLAN_MacAddress *mac;
1627 if ((NULL == addr) || (addrlen == 0))
1630 return GNUNET_SYSERR;
1632 if ('\0' != addr[addrlen - 1])
1635 return GNUNET_SYSERR;
1637 if (strlen (addr) != addrlen - 1)
1640 return GNUNET_SYSERR;
1642 if (6 != SSCANF (addr,
1643 "%X:%X:%X:%X:%X:%X",
1644 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]))
1647 return GNUNET_SYSERR;
1649 mac = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1653 *added = sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress);
1659 * Entry point for the plugin.
1661 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
1662 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
1665 libgnunet_plugin_transport_wlan_init (void *cls)
1667 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1668 struct GNUNET_TRANSPORT_PluginFunctions *api;
1669 struct Plugin *plugin;
1671 unsigned long long testmode;
1673 /* check for 'special' mode */
1674 if (NULL == env->receive)
1676 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1677 initialze the plugin or the API */
1678 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1680 api->address_pretty_printer = &wlan_plugin_address_pretty_printer;
1681 api->address_to_string = &wlan_plugin_address_to_string;
1682 api->string_to_address = &wlan_string_to_address;
1687 /* check configuration */
1689 GNUNET_CONFIGURATION_have_value (env->cfg, "transport-wlan", "TESTMODE")) &&
1691 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-wlan",
1692 "TESTMODE", &testmode)) ||
1695 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
1696 "transport-wlan", "TESTMODE");
1699 if ( (0 == testmode) &&
1700 (GNUNET_YES != GNUNET_OS_check_helper_binary ("gnunet-helper-transport-wlan")) )
1702 LOG (GNUNET_ERROR_TYPE_ERROR,
1703 _("Helper binary `%s' not SUID, cannot run WLAN transport\n"),
1704 "gnunet-helper-transport-wlan");
1708 GNUNET_CONFIGURATION_get_value_string
1709 (env->cfg, "transport-wlan", "INTERFACE",
1712 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
1713 "transport-wlan", "INTERFACE");
1717 plugin = GNUNET_malloc (sizeof (struct Plugin));
1718 plugin->interface = interface;
1720 GNUNET_STATISTICS_set (plugin->env->stats, _("# WLAN sessions allocated"),
1722 GNUNET_STATISTICS_set (plugin->env->stats, _("# WLAN MAC endpoints allocated"),
1724 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1725 GNUNET_BANDWIDTH_value_init (100 * 1024 *
1727 plugin->fragment_data_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1728 plugin->wlan_header_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1729 plugin->helper_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1730 plugin->beacon_task = GNUNET_SCHEDULER_add_now (&send_hello_beacon,
1734 case 0: /* normal */
1735 plugin->helper_argv[0] = (char *) "gnunet-helper-transport-wlan";
1736 plugin->helper_argv[1] = interface;
1737 plugin->helper_argv[2] = NULL;
1738 plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
1739 "gnunet-helper-transport-wlan",
1740 plugin->helper_argv,
1741 &handle_helper_message,
1745 case 1: /* testmode, peer 1 */
1746 plugin->helper_argv[0] = (char *) "gnunet-helper-transport-wlan-dummy";
1747 plugin->helper_argv[1] = (char *) "1";
1748 plugin->helper_argv[2] = NULL;
1749 plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
1750 "gnunet-helper-transport-wlan-dummy",
1751 plugin->helper_argv,
1752 &handle_helper_message,
1756 case 2: /* testmode, peer 2 */
1757 plugin->helper_argv[0] = (char *) "gnunet-helper-transport-wlan-dummy";
1758 plugin->helper_argv[1] = (char *) "2";
1759 plugin->helper_argv[2] = NULL;
1760 plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
1761 "gnunet-helper-transport-wlan-dummy",
1762 plugin->helper_argv,
1763 &handle_helper_message,
1771 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1773 api->send = &wlan_plugin_send;
1774 api->get_session = &wlan_plugin_get_session;
1775 api->disconnect = &wlan_plugin_disconnect;
1776 api->address_pretty_printer = &wlan_plugin_address_pretty_printer;
1777 api->check_address = &wlan_plugin_address_suggested;
1778 api->address_to_string = &wlan_plugin_address_to_string;
1779 api->string_to_address = &wlan_string_to_address;
1784 /* end of plugin_transport_wlan.c */