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__)
42 #define PLUGIN_NAME "wlan"
45 * Max size of packet (that we give to the WLAN driver for transmission)
50 * time out of a mac endpoint
52 #define MACENDPOINT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2)
55 * We reduce the frequence of HELLO beacons in relation to
56 * the number of MAC addresses currently visible to us.
57 * This is the multiplication factor.
59 #define HELLO_BEACON_SCALING_FACTOR GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 2)
62 * Maximum number of messages in defragmentation queue per MAC
64 #define MESSAGES_IN_DEFRAG_QUEUE_PER_MAC 2
67 * Link layer control fields for better compatibility
68 * (i.e. GNUnet over WLAN is not IP-over-WLAN).
70 #define WLAN_LLC_DSAP_FIELD 0x1f
71 #define WLAN_LLC_SSAP_FIELD 0x1f
74 GNUNET_NETWORK_STRUCT_BEGIN
76 * Header for messages which need fragmentation. This is the format of
77 * a message we obtain AFTER defragmentation. We then need to check
78 * the CRC and then tokenize the payload and pass it to the
85 * Message type is GNUNET_MESSAGE_TYPE_WLAN_DATA.
87 struct GNUNET_MessageHeader header;
90 * CRC32 checksum (only over the payload), in NBO.
92 uint32_t crc GNUNET_PACKED;
95 * Sender of the message.
97 struct GNUNET_PeerIdentity sender;
100 * Target of the message.
102 struct GNUNET_PeerIdentity target;
104 /* followed by payload, possibly including
105 multiple messages! */
112 uint32_t options GNUNET_PACKED;
114 struct GNUNET_TRANSPORT_WLAN_MacAddress mac;
118 GNUNET_NETWORK_STRUCT_END
122 * Information kept for each message that is yet to be fragmented and
125 struct PendingMessage
128 * next entry in the DLL
130 struct PendingMessage *next;
133 * previous entry in the DLL
135 struct PendingMessage *prev;
138 * The pending message
140 struct WlanHeader *msg;
143 * Continuation function to call once the message
144 * has been sent. Can be NULL if there is no
145 * continuation to call.
147 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
150 * Cls for transmit_cont
152 void *transmit_cont_cls;
155 * Timeout task (for this message).
157 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
163 * Session handle for connections with other peers.
168 * To whom are we talking to (set to our identity
169 * if we are still waiting for the welcome message)
171 struct GNUNET_PeerIdentity target;
174 * API requirement (must be first).
176 struct SessionHeader header;
179 * We keep all sessions in a DLL at their respective
180 * 'struct MACEndpoint'.
182 struct Session *next;
185 * We keep all sessions in a DLL at their respective
186 * 'struct MACEndpoint'.
188 struct Session *prev;
191 * MAC endpoint with the address of this peer.
193 struct MacEndpoint *mac;
196 * Head of messages currently pending for transmission to this peer.
198 struct PendingMessage *pending_message_head;
201 * Tail of messages currently pending for transmission to this peer.
203 struct PendingMessage *pending_message_tail;
206 * When should this session time out?
208 struct GNUNET_TIME_Absolute timeout;
211 * Timeout task (for the session).
213 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
219 * Struct for messages that are being fragmented in a MAC's transmission queue.
221 struct FragmentMessage
225 * This is a doubly-linked list.
227 struct FragmentMessage *next;
230 * This is a doubly-linked list.
232 struct FragmentMessage *prev;
235 * MAC endpoint this message belongs to
237 struct MacEndpoint *macendpoint;
240 * Fragmentation context
242 struct GNUNET_FRAGMENT_Context *fragcontext;
245 * Transmission handle to helper (to cancel if the frag context
246 * is destroyed early for some reason).
248 struct GNUNET_HELPER_SendHandle *sh;
251 * Intended recipient.
253 struct GNUNET_PeerIdentity target;
256 * Timeout value for the message.
258 struct GNUNET_TIME_Absolute timeout;
263 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
266 * Continuation to call when we're done with this message.
268 GNUNET_TRANSPORT_TransmitContinuation cont;
276 * Size of original message
281 * Number of bytes used to transmit message
289 * Struct to represent one network card connection
295 * We keep all MACs in a DLL in the plugin.
297 struct MacEndpoint *next;
300 * We keep all MACs in a DLL in the plugin.
302 struct MacEndpoint *prev;
305 * Pointer to the global plugin struct.
307 struct Plugin *plugin;
310 * Head of sessions that use this MAC.
312 struct Session *sessions_head;
315 * Tail of sessions that use this MAC.
317 struct Session *sessions_tail;
320 * Head of messages we are currently sending to this MAC.
322 struct FragmentMessage *sending_messages_head;
325 * Tail of messages we are currently sending to this MAC.
327 struct FragmentMessage *sending_messages_tail;
330 * Defrag context for this MAC
332 struct GNUNET_DEFRAGMENT_Context *defrag;
335 * When should this endpoint time out?
337 struct GNUNET_TIME_Absolute timeout;
342 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
345 * count of messages in the fragment out queue for this mac endpoint
347 unsigned int fragment_messages_out_count;
352 struct WlanAddress addr;
355 * Message delay for fragmentation context
357 struct GNUNET_TIME_Relative msg_delay;
360 * ACK delay for fragmentation context
362 struct GNUNET_TIME_Relative ack_delay;
365 * Desired transmission power for this MAC
370 * Desired transmission rate for this MAC
375 * Antenna we should use for this MAC
383 * Encapsulation of all of the state of the plugin.
390 struct GNUNET_TRANSPORT_PluginEnvironment *env;
393 * Handle to helper process for priviledged operations.
395 struct GNUNET_HELPER_Handle *suid_helper;
398 * ARGV-vector for the helper (all helpers take only the binary
399 * name, one actual argument, plus the NULL terminator for 'argv').
401 char * helper_argv[3];
404 * The interface of the wlan card given to us by the user.
409 * Tokenizer for demultiplexing of data packets resulting from defragmentation.
411 struct GNUNET_SERVER_MessageStreamTokenizer *fragment_data_tokenizer;
414 * Tokenizer for demultiplexing of data packets received from the suid helper
416 struct GNUNET_SERVER_MessageStreamTokenizer *helper_payload_tokenizer;
419 * Tokenizer for demultiplexing of data packets that follow the WLAN Header
421 struct GNUNET_SERVER_MessageStreamTokenizer *wlan_header_payload_tokenizer;
424 * Head of list of open connections.
426 struct MacEndpoint *mac_head;
429 * Tail of list of open connections.
431 struct MacEndpoint *mac_tail;
434 * Number of connections
436 unsigned int mac_count;
439 * Task that periodically sends a HELLO beacon via the helper.
441 GNUNET_SCHEDULER_TaskIdentifier beacon_task;
444 * Tracker for bandwidth limit
446 struct GNUNET_BANDWIDTH_Tracker tracker;
449 * The mac_address of the wlan card given to us by the helper.
451 struct GNUNET_TRANSPORT_WLAN_MacAddress mac_address;
454 * Have we received a control message with our MAC address yet?
459 * Options for addresses
467 * Information associated with a message. Can contain
468 * the session or the MAC endpoint associated with the
474 * NULL if the identity of the other peer is not known.
476 struct Session *session;
479 * MAC address of the other peer, NULL if not known.
481 struct MacEndpoint *endpoint;
485 * Function called for a quick conversion of the binary address to
486 * a numeric address. Note that the caller must not free the
487 * address and that the next call to this function is allowed
488 * to override the address again.
491 * @param addr binary address
492 * @param addrlen length of the address
493 * @return string representing the same address
496 wlan_plugin_address_to_string (void *cls, const void *addr, size_t addrlen);
499 * Print MAC addresses nicely.
501 * @param mac the mac address
502 * @return string to a static buffer with the human-readable mac, will be overwritten during the next call to this function
505 mac_to_string (const struct GNUNET_TRANSPORT_WLAN_MacAddress * mac)
507 static char macstr[20];
509 GNUNET_snprintf (macstr, sizeof (macstr), "%.2X:%.2X:%.2X:%.2X:%.2X:%.2X",
510 mac->mac[0], mac->mac[1],
511 mac->mac[2], mac->mac[3], mac->mac[4], mac->mac[5]);
517 * Fill the radiotap header
519 * @param endpoint pointer to the endpoint, can be NULL
520 * @param header pointer to the radiotap header
521 * @param size total message size
524 get_radiotap_header (struct MacEndpoint *endpoint,
525 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *header,
528 header->header.type = ntohs (GNUNET_MESSAGE_TYPE_WLAN_DATA_TO_HELPER);
529 header->header.size = ntohs (size);
530 if (NULL != endpoint)
532 header->rate = endpoint->rate;
533 header->tx_power = endpoint->tx_power;
534 header->antenna = endpoint->antenna;
539 header->tx_power = 0;
546 * Generate the WLAN hardware header for one packet
548 * @param plugin the plugin handle
549 * @param header address to write the header to
550 * @param to_mac_addr address of the recipient
551 * @param size size of the whole packet, needed to calculate the time to send the packet
554 get_wlan_header (struct Plugin *plugin,
555 struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame *header,
556 const struct GNUNET_TRANSPORT_WLAN_MacAddress *to_mac_addr,
559 const int rate = 11000000;
561 header->frame_control = htons (IEEE80211_FC0_TYPE_DATA);
562 header->addr1 = *to_mac_addr;
563 header->addr2 = plugin->mac_address;
564 header->addr3 = mac_bssid_gnunet;
565 header->duration = GNUNET_htole16 ((size * 1000000) / rate + 290);
566 header->sequence_control = 0; // FIXME?
567 header->llc[0] = WLAN_LLC_DSAP_FIELD;
568 header->llc[1] = WLAN_LLC_SSAP_FIELD;
569 header->llc[2] = 0; // FIXME?
570 header->llc[3] = 0; // FIXME?
575 * Send an ACK for a fragment we received.
577 * @param cls the 'struct MacEndpoint' the ACK must be sent to
578 * @param msg_id id of the message
579 * @param hdr pointer to the hdr where the ack is stored
582 send_ack (void *cls, uint32_t msg_id,
583 const struct GNUNET_MessageHeader *hdr)
585 struct MacEndpoint *endpoint = cls;
586 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage* radio_header;
587 uint16_t msize = ntohs (hdr->size);
588 size_t size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + msize;
591 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
596 LOG (GNUNET_ERROR_TYPE_DEBUG,
597 "Sending ACK to helper\n");
598 radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
599 get_radiotap_header (endpoint, radio_header, size);
600 get_wlan_header (endpoint->plugin,
601 &radio_header->frame,
604 memcpy (&radio_header[1], hdr, msize);
606 GNUNET_HELPER_send (endpoint->plugin->suid_helper,
607 &radio_header->header,
608 GNUNET_NO /* dropping ACKs is bad */,
610 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN ACKs sent"),
616 * Handles the data after all fragments are put together
618 * @param cls macendpoint this messages belongs to
619 * @param hdr pointer to the data
622 wlan_data_message_handler (void *cls, const struct GNUNET_MessageHeader *hdr)
624 struct MacEndpoint *endpoint = cls;
625 struct Plugin *plugin = endpoint->plugin;
626 struct MacAndSession mas;
628 GNUNET_STATISTICS_update (plugin->env->stats,
629 _("# WLAN messages defragmented"), 1,
632 mas.endpoint = endpoint;
633 (void) GNUNET_SERVER_mst_receive (plugin->fragment_data_tokenizer,
637 GNUNET_YES, GNUNET_NO);
644 * @param session the session free
647 free_session (struct Session *session)
649 struct MacEndpoint *endpoint = session->mac;
650 struct PendingMessage *pm;
652 endpoint->plugin->env->session_end (endpoint->plugin->env->cls,
655 while (NULL != (pm = session->pending_message_head))
657 GNUNET_CONTAINER_DLL_remove (session->pending_message_head,
658 session->pending_message_tail, pm);
659 if (GNUNET_SCHEDULER_NO_TASK != pm->timeout_task)
661 GNUNET_SCHEDULER_cancel (pm->timeout_task);
662 pm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
664 GNUNET_free (pm->msg);
667 GNUNET_CONTAINER_DLL_remove (endpoint->sessions_head,
668 endpoint->sessions_tail,
670 if (session->timeout_task != GNUNET_SCHEDULER_NO_TASK)
672 GNUNET_SCHEDULER_cancel (session->timeout_task);
673 session->timeout_task = GNUNET_SCHEDULER_NO_TASK;
675 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN sessions allocated"), -1,
677 GNUNET_free (session);
682 * A session is timing out. Clean up.
684 * @param cls pointer to the Session
685 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
688 session_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
690 struct Session * session = cls;
691 struct GNUNET_TIME_Relative timeout;
693 session->timeout_task = GNUNET_SCHEDULER_NO_TASK;
694 timeout = GNUNET_TIME_absolute_get_remaining (session->timeout);
695 if (0 == timeout.rel_value)
697 free_session (session);
700 session->timeout_task =
701 GNUNET_SCHEDULER_add_delayed (timeout, &session_timeout, session);
706 * Create a new session
708 * @param endpoint pointer to the mac endpoint of the peer
709 * @param peer peer identity to use for this session
710 * @return returns the session
712 static struct Session *
713 create_session (struct MacEndpoint *endpoint,
714 const struct GNUNET_PeerIdentity *peer)
716 struct Session *session;
718 for (session = endpoint->sessions_head; NULL != session; session = session->next)
719 if (0 == memcmp (peer, &session->target,
720 sizeof (struct GNUNET_PeerIdentity)))
722 session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
725 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN sessions allocated"), 1,
727 session = GNUNET_malloc (sizeof (struct Session));
728 GNUNET_CONTAINER_DLL_insert_tail (endpoint->sessions_head,
729 endpoint->sessions_tail,
731 session->mac = endpoint;
732 session->target = *peer;
733 session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
734 session->timeout_task =
735 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, &session_timeout, session);
736 LOG (GNUNET_ERROR_TYPE_DEBUG,
737 "Created new session for peer `%s' with endpoint %s\n",
739 mac_to_string (&endpoint->addr));
745 * Function called once we have successfully given the fragment
746 * message to the SUID helper process and we are thus ready for
749 * @param cls the 'struct FragmentMessage'
750 * @param result result of the operation (GNUNET_OK on success, GNUNET_NO if the helper died, GNUNET_SYSERR
751 * if the helper was stopped)
754 fragment_transmission_done (void *cls,
757 struct FragmentMessage *fm = cls;
761 GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
766 * Transmit a fragment of a message.
768 * @param cls 'struct FragmentMessage' this fragment message belongs to
769 * @param hdr pointer to the start of the fragment message
772 transmit_fragment (void *cls,
773 const struct GNUNET_MessageHeader *hdr)
775 struct FragmentMessage *fm = cls;
776 struct MacEndpoint *endpoint = fm->macendpoint;
780 msize = ntohs (hdr->size);
781 size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + msize;
784 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radio_header;
786 radio_header = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) buf;
787 get_radiotap_header (endpoint, radio_header, size);
788 get_wlan_header (endpoint->plugin,
789 &radio_header->frame,
792 memcpy (&radio_header[1], hdr, msize);
793 GNUNET_assert (NULL == fm->sh);
794 fm->sh = GNUNET_HELPER_send (endpoint->plugin->suid_helper,
795 &radio_header->header,
797 &fragment_transmission_done, fm);
798 fm->size_on_wire += size;
800 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN message fragments sent"),
803 GNUNET_FRAGMENT_context_transmission_done (fm->fragcontext);
804 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
805 "# bytes currently in WLAN buffers",
807 GNUNET_STATISTICS_update (endpoint->plugin->env->stats,
808 "# bytes transmitted via WLAN",
815 * Frees the space of a message in the fragment queue (send queue)
817 * @param fm message to free
820 free_fragment_message (struct FragmentMessage *fm)
822 struct MacEndpoint *endpoint = fm->macendpoint;
824 GNUNET_STATISTICS_update (endpoint->plugin->env->stats, _("# WLAN messages pending (with fragmentation)"),
826 GNUNET_CONTAINER_DLL_remove (endpoint->sending_messages_head,
827 endpoint->sending_messages_tail, fm);
830 GNUNET_HELPER_send_cancel (fm->sh);
833 GNUNET_FRAGMENT_context_destroy (fm->fragcontext,
834 &endpoint->msg_delay,
835 &endpoint->ack_delay);
836 if (fm->timeout_task != GNUNET_SCHEDULER_NO_TASK)
838 GNUNET_SCHEDULER_cancel (fm->timeout_task);
839 fm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
846 * A FragmentMessage has timed out. Remove it.
848 * @param cls pointer to the 'struct FragmentMessage'
849 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
852 fragmentmessage_timeout (void *cls,
853 const struct GNUNET_SCHEDULER_TaskContext *tc)
855 struct FragmentMessage *fm = cls;
857 fm->timeout_task = GNUNET_SCHEDULER_NO_TASK;
858 if (NULL != fm->cont)
860 fm->cont (fm->cont_cls, &fm->target, GNUNET_SYSERR, fm->size_payload, fm->size_on_wire);
863 free_fragment_message (fm);
868 * Transmit a message to the given destination with fragmentation.
870 * @param endpoint desired destination
871 * @param timeout how long can the message wait?
872 * @param target peer that should receive the message
873 * @param msg message to transmit
874 * @param payload_size bytes of payload
875 * @param cont continuation to call once the message has
876 * been transmitted (or if the transport is ready
877 * for the next transmission call; or if the
878 * peer disconnected...); can be NULL
879 * @param cont_cls closure for cont
882 send_with_fragmentation (struct MacEndpoint *endpoint,
883 struct GNUNET_TIME_Relative timeout,
884 const struct GNUNET_PeerIdentity *target,
885 const struct GNUNET_MessageHeader *msg,
887 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
890 struct FragmentMessage *fm;
891 struct Plugin *plugin;
893 plugin = endpoint->plugin;
894 fm = GNUNET_malloc (sizeof (struct FragmentMessage));
895 fm->macendpoint = endpoint;
896 fm->target = *target;
897 fm->size_payload = payload_size;
898 fm->size_on_wire = 0;
899 fm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
901 fm->cont_cls = cont_cls;
902 /* 1 MBit/s typical data rate, 1430 byte fragments => ~100 ms per message */
904 GNUNET_FRAGMENT_context_create (plugin->env->stats, WLAN_MTU,
909 &transmit_fragment, fm);
911 GNUNET_SCHEDULER_add_delayed (timeout,
912 &fragmentmessage_timeout, fm);
913 GNUNET_CONTAINER_DLL_insert_tail (endpoint->sending_messages_head,
914 endpoint->sending_messages_tail,
920 * Free a MAC endpoint.
922 * @param endpoint pointer to the MacEndpoint to free
925 free_macendpoint (struct MacEndpoint *endpoint)
927 struct Plugin *plugin = endpoint->plugin;
928 struct FragmentMessage *fm;
929 struct Session *session;
931 GNUNET_STATISTICS_update (plugin->env->stats,
932 _("# WLAN MAC endpoints allocated"), -1, GNUNET_NO);
933 while (NULL != (session = endpoint->sessions_head))
934 free_session (session);
935 while (NULL != (fm = endpoint->sending_messages_head))
936 free_fragment_message (fm);
937 GNUNET_CONTAINER_DLL_remove (plugin->mac_head,
941 if (NULL != endpoint->defrag)
943 GNUNET_DEFRAGMENT_context_destroy(endpoint->defrag);
944 endpoint->defrag = NULL;
948 if (GNUNET_SCHEDULER_NO_TASK != endpoint->timeout_task)
950 GNUNET_SCHEDULER_cancel (endpoint->timeout_task);
951 endpoint->timeout_task = GNUNET_SCHEDULER_NO_TASK;
953 GNUNET_free (endpoint);
958 * A MAC endpoint is timing out. Clean up.
960 * @param cls pointer to the MacEndpoint
961 * @param tc pointer to the GNUNET_SCHEDULER_TaskContext
964 macendpoint_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
966 struct MacEndpoint *endpoint = cls;
967 struct GNUNET_TIME_Relative timeout;
969 endpoint->timeout_task = GNUNET_SCHEDULER_NO_TASK;
970 timeout = GNUNET_TIME_absolute_get_remaining (endpoint->timeout);
971 if (0 == timeout.rel_value)
973 free_macendpoint (endpoint);
976 endpoint->timeout_task =
977 GNUNET_SCHEDULER_add_delayed (timeout, &macendpoint_timeout,
983 * Find (or create) a MacEndpoint with a specific MAC address
985 * @param plugin pointer to the plugin struct
986 * @param addr the MAC address of the endpoint
987 * @return handle to our data structure for this MAC
989 static struct MacEndpoint *
990 create_macendpoint (struct Plugin *plugin,
991 const struct WlanAddress *addr)
993 struct MacEndpoint *pos;
995 for (pos = plugin->mac_head; NULL != pos; pos = pos->next)
996 if (0 == memcmp (addr, &pos->addr, sizeof (struct WlanAddress)))
998 pos = GNUNET_malloc (sizeof (struct MacEndpoint));
1000 pos->plugin = plugin;
1002 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, WLAN_MTU,
1003 MESSAGES_IN_DEFRAG_QUEUE_PER_MAC,
1005 &wlan_data_message_handler,
1008 pos->msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
1009 pos->ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1011 pos->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
1013 GNUNET_SCHEDULER_add_delayed (MACENDPOINT_TIMEOUT, &macendpoint_timeout,
1015 GNUNET_CONTAINER_DLL_insert (plugin->mac_head, plugin->mac_tail, pos);
1016 plugin->mac_count++;
1017 GNUNET_STATISTICS_update (plugin->env->stats, _("# WLAN MAC endpoints allocated"),
1019 LOG (GNUNET_ERROR_TYPE_DEBUG,
1020 "New MAC endpoint `%s'\n",
1021 wlan_plugin_address_to_string(NULL, addr, sizeof (struct WlanAddress)));
1027 * Creates a new outbound session the transport service will use to send data to the
1030 * @param cls the plugin
1031 * @param address the address
1032 * @return the session or NULL of max connections exceeded
1034 static struct Session *
1035 wlan_plugin_get_session (void *cls,
1036 const struct GNUNET_HELLO_Address *address)
1038 struct Plugin *plugin = cls;
1039 struct MacEndpoint *endpoint;
1041 if (NULL == address)
1043 if (sizeof (struct WlanAddress) != address->address_length)
1048 LOG (GNUNET_ERROR_TYPE_DEBUG,
1049 "Service asked to create session for peer `%s' with MAC `%s'\n",
1050 GNUNET_i2s (&address->peer),
1051 wlan_plugin_address_to_string(NULL, address->address, address->address_length));
1052 endpoint = create_macendpoint (plugin, address->address);
1053 return create_session (endpoint, &address->peer);
1058 * Function that can be used to force the plugin to disconnect
1059 * from the given peer and cancel all previous transmissions
1060 * (and their continuation).
1062 * @param cls closure
1063 * @param target peer from which to disconnect
1066 wlan_plugin_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
1068 struct Plugin *plugin = cls;
1069 struct Session *session;
1070 struct MacEndpoint *endpoint;
1072 for (endpoint = plugin->mac_head; NULL != endpoint; endpoint = endpoint->next)
1073 for (session = endpoint->sessions_head; NULL != session; session = session->next)
1074 if (0 == memcmp (target, &session->target,
1075 sizeof (struct GNUNET_PeerIdentity)))
1077 free_session (session);
1078 break; /* inner-loop only (in case peer has another MAC as well!) */
1084 * Function that can be used by the transport service to transmit
1085 * a message using the plugin. Note that in the case of a
1086 * peer disconnecting, the continuation MUST be called
1087 * prior to the disconnect notification itself. This function
1088 * will be called with this peer's HELLO message to initiate
1089 * a fresh connection to another peer.
1091 * @param cls closure
1092 * @param session which session must be used
1093 * @param msgbuf the message to transmit
1094 * @param msgbuf_size number of bytes in 'msgbuf'
1095 * @param priority how important is the message (most plugins will
1096 * ignore message priority and just FIFO)
1097 * @param to how long to wait at most for the transmission (does not
1098 * require plugins to discard the message after the timeout,
1099 * just advisory for the desired delay; most plugins will ignore
1101 * @param cont continuation to call once the message has
1102 * been transmitted (or if the transport is ready
1103 * for the next transmission call; or if the
1104 * peer disconnected...); can be NULL
1105 * @param cont_cls closure for cont
1106 * @return number of bytes used (on the physical network, with overheads);
1107 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1108 * and does NOT mean that the message was not transmitted (DV)
1111 wlan_plugin_send (void *cls,
1112 struct Session *session,
1113 const char *msgbuf, size_t msgbuf_size,
1114 unsigned int priority,
1115 struct GNUNET_TIME_Relative to,
1116 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1118 struct Plugin *plugin = cls;
1119 struct WlanHeader *wlanheader;
1120 size_t size = msgbuf_size + sizeof (struct WlanHeader);
1121 char buf[size] GNUNET_ALIGN;
1123 LOG (GNUNET_ERROR_TYPE_DEBUG,
1124 "Transmitting %u bytes of payload to peer `%s' (starting with %u byte message of type %u)\n",
1126 GNUNET_i2s (&session->target),
1127 (unsigned int) ntohs (((struct GNUNET_MessageHeader*)msgbuf)->size),
1128 (unsigned int) ntohs (((struct GNUNET_MessageHeader*)msgbuf)->type));
1129 wlanheader = (struct WlanHeader *) buf;
1130 wlanheader->header.size = htons (msgbuf_size + sizeof (struct WlanHeader));
1131 wlanheader->header.type = htons (GNUNET_MESSAGE_TYPE_WLAN_DATA);
1132 wlanheader->sender = *plugin->env->my_identity;
1133 wlanheader->target = session->target;
1134 wlanheader->crc = htonl (GNUNET_CRYPTO_crc32_n (msgbuf, msgbuf_size));
1135 memcpy (&wlanheader[1], msgbuf, msgbuf_size);
1137 GNUNET_STATISTICS_update (plugin->env->stats,
1138 "# bytes currently in WLAN buffers",
1139 msgbuf_size, GNUNET_NO);
1141 send_with_fragmentation (session->mac,
1144 &wlanheader->header,
1152 * We have received data from the WLAN via some session. Process depending
1153 * on the message type (HELLO, DATA, FRAGMENTATION or FRAGMENTATION-ACK).
1155 * @param cls pointer to the plugin
1156 * @param client pointer to the session this message belongs to
1157 * @param hdr start of the message
1160 process_data (void *cls, void *client, const struct GNUNET_MessageHeader *hdr)
1162 struct Plugin *plugin = cls;
1163 struct MacAndSession *mas = client;
1164 struct MacAndSession xmas;
1165 struct GNUNET_ATS_Information ats;
1166 struct FragmentMessage *fm;
1167 struct GNUNET_PeerIdentity tmpsource;
1168 const struct WlanHeader *wlanheader;
1172 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
1173 ats.value = htonl (GNUNET_ATS_NET_WLAN);
1174 msize = ntohs (hdr->size);
1176 GNUNET_STATISTICS_update (plugin->env->stats,
1177 "# bytes received via WLAN",
1180 switch (ntohs (hdr->type))
1182 case GNUNET_MESSAGE_TYPE_HELLO:
1184 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hdr, &tmpsource))
1186 GNUNET_break_op (0);
1189 LOG (GNUNET_ERROR_TYPE_DEBUG,
1190 "Processing %u bytes of HELLO from peer `%s' at MAC %s\n",
1191 (unsigned int) msize,
1192 GNUNET_i2s (&tmpsource),
1193 wlan_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
1195 GNUNET_STATISTICS_update (plugin->env->stats,
1196 _("# HELLO messages received via WLAN"), 1,
1198 plugin->env->receive (plugin->env->cls,
1202 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1203 (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1204 plugin->env->update_address_metrics (plugin->env->cls,
1206 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1207 (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress),
1211 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1212 if (NULL == mas->endpoint)
1217 LOG (GNUNET_ERROR_TYPE_DEBUG,
1218 "Processing %u bytes of FRAGMENT from MAC %s\n",
1219 (unsigned int) msize,
1220 wlan_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
1221 GNUNET_STATISTICS_update (plugin->env->stats,
1222 _("# fragments received via WLAN"), 1, GNUNET_NO);
1223 (void) GNUNET_DEFRAGMENT_process_fragment (mas->endpoint->defrag,
1226 case GNUNET_MESSAGE_TYPE_FRAGMENT_ACK:
1227 if (NULL == mas->endpoint)
1232 GNUNET_STATISTICS_update (plugin->env->stats, _("# ACKs received via WLAN"),
1234 for (fm = mas->endpoint->sending_messages_head; NULL != fm; fm = fm->next)
1236 ret = GNUNET_FRAGMENT_process_ack (fm->fragcontext, hdr);
1237 if (GNUNET_OK == ret)
1239 LOG (GNUNET_ERROR_TYPE_DEBUG,
1240 "Got last ACK, finished message transmission to `%s' (%p)\n",
1241 wlan_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)),
1243 mas->endpoint->timeout = GNUNET_TIME_relative_to_absolute (MACENDPOINT_TIMEOUT);
1244 if (NULL != fm->cont)
1246 fm->cont (fm->cont_cls, &fm->target, GNUNET_OK, fm->size_payload, fm->size_on_wire);
1249 free_fragment_message (fm);
1252 if (GNUNET_NO == ret)
1254 LOG (GNUNET_ERROR_TYPE_DEBUG,
1255 "Got an ACK, message transmission to `%s' not yet finished\n",
1256 wlan_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
1260 LOG (GNUNET_ERROR_TYPE_DEBUG,
1261 "ACK not matched against any active fragmentation with MAC `%s'\n",
1262 wlan_plugin_address_to_string (NULL, &mas->endpoint->addr, sizeof (struct WlanAddress)));
1264 case GNUNET_MESSAGE_TYPE_WLAN_DATA:
1265 if (NULL == mas->endpoint)
1270 if (msize < sizeof (struct WlanHeader))
1275 wlanheader = (const struct WlanHeader *) hdr;
1276 if (0 != memcmp (&wlanheader->target,
1277 plugin->env->my_identity,
1278 sizeof (struct GNUNET_PeerIdentity)))
1280 LOG (GNUNET_ERROR_TYPE_DEBUG,
1281 "WLAN data for `%s', not for me, ignoring\n",
1282 GNUNET_i2s (&wlanheader->target));
1285 if (ntohl (wlanheader->crc) !=
1286 GNUNET_CRYPTO_crc32_n (&wlanheader[1], msize - sizeof (struct WlanHeader)))
1288 GNUNET_STATISTICS_update (plugin->env->stats,
1289 _("# WLAN DATA messages discarded due to CRC32 error"), 1,
1293 xmas.endpoint = mas->endpoint;
1294 xmas.session = create_session (mas->endpoint, &wlanheader->sender);
1295 LOG (GNUNET_ERROR_TYPE_DEBUG,
1296 "Processing %u bytes of WLAN DATA from peer `%s'\n",
1297 (unsigned int) msize,
1298 GNUNET_i2s (&wlanheader->sender));
1299 (void) GNUNET_SERVER_mst_receive (plugin->wlan_header_payload_tokenizer,
1301 (const char *) &wlanheader[1],
1302 msize - sizeof (struct WlanHeader),
1303 GNUNET_YES, GNUNET_NO);
1306 if (NULL == mas->endpoint)
1311 if (NULL == mas->session)
1316 LOG (GNUNET_ERROR_TYPE_DEBUG,
1317 "Received packet with %u bytes of type %u from peer %s\n",
1318 (unsigned int) msize,
1319 (unsigned int) ntohs (hdr->type),
1320 GNUNET_i2s (&mas->session->target));
1321 plugin->env->receive (plugin->env->cls,
1322 &mas->session->target,
1325 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1326 (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
1327 plugin->env->update_address_metrics (plugin->env->cls,
1328 &mas->session->target,
1329 (mas->endpoint == NULL) ? NULL : (const char *) &mas->endpoint->addr,
1330 (mas->endpoint == NULL) ? 0 : sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress),
1340 * Function used for to process the data from the suid process
1342 * @param cls the plugin handle
1343 * @param client client that send the data (not used)
1344 * @param hdr header of the GNUNET_MessageHeader
1347 handle_helper_message (void *cls, void *client,
1348 const struct GNUNET_MessageHeader *hdr)
1350 struct Plugin *plugin = cls;
1351 const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *rxinfo;
1352 const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *cm;
1353 struct WlanAddress wa;
1354 struct MacAndSession mas;
1357 msize = ntohs (hdr->size);
1358 switch (ntohs (hdr->type))
1360 case GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL:
1361 if (msize != sizeof (struct GNUNET_TRANSPORT_WLAN_HelperControlMessage))
1366 cm = (const struct GNUNET_TRANSPORT_WLAN_HelperControlMessage *) hdr;
1367 if (GNUNET_YES == plugin->have_mac)
1369 if (0 == memcmp (&plugin->mac_address,
1371 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1372 break; /* no change */
1373 /* remove old address */
1374 memset (&wa, 0, sizeof (struct WlanAddress));
1375 wa.mac = plugin->mac_address;
1376 wa.options = htonl(plugin->options);
1377 plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
1382 plugin->mac_address = cm->mac;
1383 plugin->have_mac = GNUNET_YES;
1384 memset (&wa, 0, sizeof (struct WlanAddress));
1385 wa.mac = plugin->mac_address;
1386 wa.options = htonl(plugin->options);
1387 LOG (GNUNET_ERROR_TYPE_DEBUG,
1388 "Received WLAN_HELPER_CONTROL message with MAC address `%s' for peer `%s'\n",
1389 mac_to_string (&cm->mac),
1390 GNUNET_i2s (plugin->env->my_identity));
1391 plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
1393 sizeof (struct WlanAddress),
1396 case GNUNET_MESSAGE_TYPE_WLAN_DATA_FROM_HELPER:
1397 LOG (GNUNET_ERROR_TYPE_DEBUG,
1398 "Got data message from helper with %u bytes\n",
1400 GNUNET_STATISTICS_update (plugin->env->stats,
1401 _("# DATA messages received via WLAN"), 1,
1403 if (msize < sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage))
1406 LOG (GNUNET_ERROR_TYPE_DEBUG,
1407 "Size of packet is too small (%u bytes)\n",
1411 rxinfo = (const struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *) hdr;
1413 /* check if message is actually for us */
1414 if (0 != memcmp (&rxinfo->frame.addr3, &mac_bssid_gnunet,
1415 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1417 /* Not the GNUnet BSSID */
1420 if ( (0 != memcmp (&rxinfo->frame.addr1, &bc_all_mac,
1421 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))) &&
1422 (0 != memcmp (&rxinfo->frame.addr1, &plugin->mac_address,
1423 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress))) )
1425 /* Neither broadcast nor specifically for us */
1428 if (0 == memcmp (&rxinfo->frame.addr2, &plugin->mac_address,
1429 sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress)))
1431 /* packet is FROM us, thus not FOR us */
1435 GNUNET_STATISTICS_update (plugin->env->stats,
1436 _("# WLAN DATA messages processed"),
1438 LOG (GNUNET_ERROR_TYPE_DEBUG,
1439 "Receiving %u bytes of data from MAC `%s'\n",
1440 (unsigned int) (msize - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage)),
1441 mac_to_string (&rxinfo->frame.addr2));
1442 wa.mac = rxinfo->frame.addr2;
1443 wa.options = htonl (0);
1444 mas.endpoint = create_macendpoint (plugin, &wa);
1446 (void) GNUNET_SERVER_mst_receive (plugin->helper_payload_tokenizer,
1448 (const char*) &rxinfo[1],
1449 msize - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage),
1450 GNUNET_YES, GNUNET_NO);
1454 LOG (GNUNET_ERROR_TYPE_DEBUG,
1455 "Unexpected message of type %u (%u bytes)",
1456 ntohs (hdr->type), ntohs (hdr->size));
1465 * Task to (periodically) send a HELLO beacon
1467 * @param cls pointer to the plugin struct
1468 * @param tc scheduler context
1471 send_hello_beacon (void *cls,
1472 const struct GNUNET_SCHEDULER_TaskContext *tc)
1474 struct Plugin *plugin = cls;
1476 uint16_t hello_size;
1477 struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radioHeader;
1478 const struct GNUNET_MessageHeader *hello;
1480 hello = plugin->env->get_our_hello ();
1481 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
1482 GNUNET_assert (sizeof (struct WlanHeader) + hello_size <= WLAN_MTU);
1483 size = sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) + hello_size;
1485 char buf[size] GNUNET_ALIGN;
1487 LOG (GNUNET_ERROR_TYPE_DEBUG,
1488 "Sending %u byte HELLO beacon\n",
1489 (unsigned int) size);
1490 radioHeader = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage*) buf;
1491 get_radiotap_header (NULL, radioHeader, size);
1492 get_wlan_header (plugin, &radioHeader->frame, &bc_all_mac, size);
1493 memcpy (&radioHeader[1], hello, hello_size);
1495 GNUNET_HELPER_send (plugin->suid_helper,
1496 &radioHeader->header,
1497 GNUNET_YES /* can drop */,
1499 GNUNET_STATISTICS_update (plugin->env->stats, _("# HELLO beacons sent via WLAN"),
1502 plugin->beacon_task =
1503 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
1504 (HELLO_BEACON_SCALING_FACTOR,
1505 plugin->mac_count + 1),
1513 * Another peer has suggested an address for this
1514 * peer and transport plugin. Check that this could be a valid
1515 * address. If so, consider adding it to the list
1518 * @param cls closure
1519 * @param addr pointer to the address
1520 * @param addrlen length of addr
1521 * @return GNUNET_OK if this is a plausible address for this peer
1525 wlan_plugin_address_suggested (void *cls, const void *addr, size_t addrlen)
1527 struct Plugin *plugin = cls;
1528 struct WlanAddress *wa = (struct WlanAddress *) addr;
1530 if (addrlen != sizeof (struct WlanAddress))
1532 GNUNET_break_op (0);
1533 return GNUNET_SYSERR;
1535 if (GNUNET_YES != plugin->have_mac)
1537 LOG (GNUNET_ERROR_TYPE_DEBUG,
1538 "Rejecting MAC `%s': I don't know my MAC!\n",
1539 mac_to_string (addr));
1540 return GNUNET_NO; /* don't know my MAC */
1542 if (0 != memcmp (&wa->mac,
1543 &plugin->mac_address,
1546 LOG (GNUNET_ERROR_TYPE_DEBUG,
1547 "Rejecting MAC `%s': not my MAC!\n",
1548 mac_to_string (addr));
1549 return GNUNET_NO; /* not my MAC */
1556 * Function called for a quick conversion of the binary address to
1557 * a numeric address. Note that the caller must not free the
1558 * address and that the next call to this function is allowed
1559 * to override the address again.
1561 * @param cls closure
1562 * @param addr binary address
1563 * @param addrlen length of the address
1564 * @return string representing the same address
1567 wlan_plugin_address_to_string (void *cls, const void *addr, size_t addrlen)
1569 const struct GNUNET_TRANSPORT_WLAN_MacAddress *mac;
1570 static char macstr[36];
1572 if (sizeof (struct WlanAddress) != addrlen)
1577 mac = &((struct WlanAddress *) addr)->mac;
1578 GNUNET_snprintf (macstr, sizeof (macstr), "%s.%u.%s",
1579 PLUGIN_NAME, ntohl (((struct WlanAddress *) addr)->options),
1580 mac_to_string (mac));
1587 * Convert the transports address to a nice, human-readable format.
1589 * @param cls closure
1590 * @param type name of the transport that generated the address
1591 * @param addr one of the addresses of the host, NULL for the last address
1592 * the specific address format depends on the transport
1593 * @param addrlen length of the address
1594 * @param numeric should (IP) addresses be displayed in numeric form?
1595 * @param timeout after how long should we give up?
1596 * @param asc function to call on each string
1597 * @param asc_cls closure for asc
1600 wlan_plugin_address_pretty_printer (void *cls, const char *type,
1601 const void *addr, size_t addrlen,
1603 struct GNUNET_TIME_Relative timeout,
1604 GNUNET_TRANSPORT_AddressStringCallback asc,
1609 if (sizeof (struct WlanAddress) != addrlen)
1611 /* invalid address */
1612 LOG (GNUNET_ERROR_TYPE_WARNING,
1613 _("WLAN address with invalid size encountered\n"));
1614 asc (asc_cls, NULL);
1617 ret = GNUNET_strdup (wlan_plugin_address_to_string(NULL, addr, addrlen));
1620 asc (asc_cls, NULL);
1625 * Exit point from the plugin.
1627 * @param cls pointer to the api struct
1630 libgnunet_plugin_transport_wlan_done (void *cls)
1632 struct WlanAddress wa;
1633 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1634 struct Plugin *plugin = api->cls;
1635 struct MacEndpoint *endpoint;
1636 struct MacEndpoint *endpoint_next;
1644 if (GNUNET_YES == plugin->have_mac)
1646 memset (&wa, 0, sizeof (wa));
1647 wa.options = htonl (plugin->options);
1648 wa.mac = plugin->mac_address;
1649 plugin->env->notify_address (plugin->env->cls, GNUNET_NO,
1651 sizeof (struct WlanAddress),
1653 plugin->have_mac = GNUNET_NO;
1656 if (GNUNET_SCHEDULER_NO_TASK != plugin->beacon_task)
1658 GNUNET_SCHEDULER_cancel (plugin->beacon_task);
1659 plugin->beacon_task = GNUNET_SCHEDULER_NO_TASK;
1661 if (NULL != plugin->suid_helper)
1663 GNUNET_HELPER_stop (plugin->suid_helper, GNUNET_NO);
1664 plugin->suid_helper = NULL;
1666 endpoint_next = plugin->mac_head;
1667 while (NULL != (endpoint = endpoint_next))
1669 endpoint_next = endpoint->next;
1670 free_macendpoint (endpoint);
1672 if (NULL != plugin->fragment_data_tokenizer)
1674 GNUNET_SERVER_mst_destroy (plugin->fragment_data_tokenizer);
1675 plugin->fragment_data_tokenizer = NULL;
1677 if (NULL != plugin->wlan_header_payload_tokenizer)
1679 GNUNET_SERVER_mst_destroy (plugin->wlan_header_payload_tokenizer);
1680 plugin->wlan_header_payload_tokenizer = NULL;
1682 if (NULL != plugin->helper_payload_tokenizer)
1684 GNUNET_SERVER_mst_destroy (plugin->helper_payload_tokenizer);
1685 plugin->helper_payload_tokenizer = NULL;
1687 GNUNET_free_non_null (plugin->interface);
1688 GNUNET_free (plugin);
1695 * Function called to convert a string address to
1698 * @param cls closure ('struct Plugin*')
1699 * @param addr string address
1700 * @param addrlen length of the address
1701 * @param buf location to store the buffer
1702 * @param added location to store the number of bytes in the buffer.
1703 * If the function returns GNUNET_SYSERR, its contents are undefined.
1704 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
1707 wlan_string_to_address (void *cls, const char *addr, uint16_t addrlen,
1708 void **buf, size_t *added)
1710 struct WlanAddress *wa;
1716 if ((NULL == addr) || (addrlen == 0))
1719 return GNUNET_SYSERR;
1721 if ('\0' != addr[addrlen - 1])
1724 return GNUNET_SYSERR;
1726 if (strlen (addr) != addrlen - 1)
1729 return GNUNET_SYSERR;
1732 if (8 != SSCANF (addr,
1733 "%4s.%u.%X:%X:%X:%X:%X:%X",
1735 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]))
1738 return GNUNET_SYSERR;
1740 wa = GNUNET_malloc (sizeof (struct WlanAddress));
1742 wa->mac.mac[i] = a[i];
1743 wa->options = htonl (0);
1745 *added = sizeof (struct WlanAddress);
1751 * Entry point for the plugin.
1753 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
1754 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
1757 libgnunet_plugin_transport_wlan_init (void *cls)
1759 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1760 struct GNUNET_TRANSPORT_PluginFunctions *api;
1761 struct Plugin *plugin;
1763 unsigned long long testmode;
1766 /* check for 'special' mode */
1767 if (NULL == env->receive)
1769 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
1770 initialze the plugin or the API */
1771 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1773 api->address_pretty_printer = &wlan_plugin_address_pretty_printer;
1774 api->address_to_string = &wlan_plugin_address_to_string;
1775 api->string_to_address = &wlan_string_to_address;
1780 /* check configuration */
1782 GNUNET_CONFIGURATION_have_value (env->cfg, "transport-wlan", "TESTMODE")) &&
1784 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-wlan",
1785 "TESTMODE", &testmode)) ||
1788 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
1789 "transport-wlan", "TESTMODE");
1792 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-transport-wlan");
1793 if ( (0 == testmode) &&
1794 (GNUNET_YES != GNUNET_OS_check_helper_binary (binary, GNUNET_YES, NULL)) )
1796 LOG (GNUNET_ERROR_TYPE_ERROR,
1797 _("Helper binary `%s' not SUID, cannot run WLAN transport\n"),
1798 "gnunet-helper-transport-wlan");
1799 GNUNET_free (binary);
1802 GNUNET_free (binary);
1804 GNUNET_CONFIGURATION_get_value_string
1805 (env->cfg, "transport-wlan", "INTERFACE",
1808 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
1809 "transport-wlan", "INTERFACE");
1813 plugin = GNUNET_malloc (sizeof (struct Plugin));
1814 plugin->interface = interface;
1816 GNUNET_STATISTICS_set (plugin->env->stats, _("# WLAN sessions allocated"),
1818 GNUNET_STATISTICS_set (plugin->env->stats, _("# WLAN MAC endpoints allocated"),
1820 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1821 GNUNET_BANDWIDTH_value_init (100 * 1024 *
1823 plugin->fragment_data_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1824 plugin->wlan_header_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1825 plugin->helper_payload_tokenizer = GNUNET_SERVER_mst_create (&process_data, plugin);
1826 plugin->beacon_task = GNUNET_SCHEDULER_add_now (&send_hello_beacon,
1829 plugin->options = 0;
1831 /* some compilers do not like switch on 'long long'... */
1832 switch ((unsigned int) testmode)
1834 case 0: /* normal */
1835 plugin->helper_argv[0] = (char *) "gnunet-helper-transport-wlan";
1836 plugin->helper_argv[1] = interface;
1837 plugin->helper_argv[2] = NULL;
1838 plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
1839 "gnunet-helper-transport-wlan",
1840 plugin->helper_argv,
1841 &handle_helper_message,
1845 case 1: /* testmode, peer 1 */
1846 plugin->helper_argv[0] = (char *) "gnunet-helper-transport-wlan-dummy";
1847 plugin->helper_argv[1] = (char *) "1";
1848 plugin->helper_argv[2] = NULL;
1849 plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
1850 "gnunet-helper-transport-wlan-dummy",
1851 plugin->helper_argv,
1852 &handle_helper_message,
1856 case 2: /* testmode, peer 2 */
1857 plugin->helper_argv[0] = (char *) "gnunet-helper-transport-wlan-dummy";
1858 plugin->helper_argv[1] = (char *) "2";
1859 plugin->helper_argv[2] = NULL;
1860 plugin->suid_helper = GNUNET_HELPER_start (GNUNET_NO,
1861 "gnunet-helper-transport-wlan-dummy",
1862 plugin->helper_argv,
1863 &handle_helper_message,
1871 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1873 api->send = &wlan_plugin_send;
1874 api->get_session = &wlan_plugin_get_session;
1875 api->disconnect = &wlan_plugin_disconnect;
1876 api->address_pretty_printer = &wlan_plugin_address_pretty_printer;
1877 api->check_address = &wlan_plugin_address_suggested;
1878 api->address_to_string = &wlan_plugin_address_to_string;
1879 api->string_to_address = &wlan_string_to_address;
1884 /* end of plugin_transport_wlan.c */