2 This file is part of GNUnet
3 (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/plugin_transport_wlan.c
23 * @brief transport plugin for wlan
24 * @author David Brodski
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 "wlan/ieee80211.h"
41 #define PROTOCOL_PREFIX "wlan"
44 * Max size of packet from helper
49 * Time until retransmission of a fragment in ms
51 #define FRAGMENT_TIMEOUT GNUNET_TIME_UNIT_SECONDS
53 #define FRAGMENT_QUEUE_SIZE 10
54 #define FRAGMENT_QUEUE_MESSAGES_OUT_PER_SESSION 1
56 #define MESSAGE_IN_TIMEOUT GNUNET_TIME_UNIT_SECONDS
58 #define MESSAGES_IN_QUEUE_SIZE 10
59 #define MESSAGES_IN_QUEUE_PER_SESSION 1
61 #define HALLO_BEACON_SCALING_FACTOR 900
63 #define DEBUG_wlan GNUNET_NO
65 #define MESSAGE_LENGHT_UNKNOWN -1
66 //#define NO_MESSAGE_OR_MESSAGE_FINISHED -2
69 * After how long do we expire an address that we
70 * learned from another peer if it is not reconfirmed
73 #define LEARNED_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 6)
76 * Initial handshake message for a session.
81 * Type is GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME.
83 struct GNUNET_MessageHeader header;
86 * Identit*mac_y of the node connecting (TCP client)
88 struct GNUNET_PeerIdentity clientIdentity;
93 * Encapsulation of all of the state of the plugin.
100 struct GNUNET_TRANSPORT_PluginEnvironment *env;
103 * List of open sessions. head
105 struct Sessionqueue *sessions;
108 * List of open sessions. tail
110 struct Sessionqueue *sessions_tail;
119 * encapsulation of data from the local wlan helper program
122 struct GNUNET_SERVER_MessageStreamTokenizer * suid_tokenizer;
125 * encapsulation of packets received
128 struct GNUNET_SERVER_MessageStreamTokenizer * data_tokenizer;
131 * stdout pipe handle for the gnunet-wlan-helper process
133 struct GNUNET_DISK_PipeHandle *server_stdout;
136 * stdout file handle for the gnunet-wlan-helper process
138 const struct GNUNET_DISK_FileHandle *server_stdout_handle;
141 * stdin pipe handle for the gnunet-wlan-helper process
143 struct GNUNET_DISK_PipeHandle *server_stdin;
146 * stdin file handle for the gnunet-wlan-helper process
148 const struct GNUNET_DISK_FileHandle *server_stdin_handle;
151 * ID of the gnunet-wlan-server std read task
153 GNUNET_SCHEDULER_TaskIdentifier server_read_task;
156 * ID of the gnunet-wlan-server std read task
158 GNUNET_SCHEDULER_TaskIdentifier server_write_task;
161 * ID of the delay task for writing
163 GNUNET_SCHEDULER_TaskIdentifier server_write_delay_task;
166 * The process id of the wlan process
168 struct GNUNET_OS_Process *server_proc;
171 * The interface of the wlan card given to us by the user.
176 * The mac_address of the wlan card given to us by the helper.
178 struct MacAddress mac_address;
181 * Sessions currently pending for transmission
182 * to this peer, if any.
184 struct Sessionqueue * pending_Sessions;
187 * Sessions currently pending for transmission
188 * to this peer (tail), if any.
190 struct Sessionqueue * pending_Sessions_tail;
193 * number of pending sessions
195 unsigned int pendingsessions;
198 * Messages in the fragmentation queue, head
201 struct FragmentMessage * pending_Fragment_Messages_head;
204 * Messages in the fragmentation queue, tail
207 struct FragmentMessage * pending_Fragment_Messages_tail;
210 * number of pending fragment message
213 unsigned int pending_fragment_messages;
216 * Messages in the in Queue, head
219 struct Receive_Message_Queue * receive_messages_head;
222 * Messages in the in Queue, tail
225 struct Receive_Message_Queue * receive_messages_teil;
228 * number of messages in the in queue
231 unsigned int pending_receive_messages;
234 * time of the next "hello-beacon"
237 struct GNUNET_TIME_Absolute beacon_time;
240 * queue to send acks for received fragments (head)
243 struct AckSendQueue * ack_send_queue_head;
246 * queue to send acks for received fragments (tail)
249 struct AckSendQueue * ack_send_queue_tail;
254 * Struct to store data if file write did not accept the whole packet
258 struct Plugin * plugin;
260 struct GNUNET_MessageHeader * msgstart;
265 * Queue of sessions, for the general session queue and the pending session queue
270 struct Sessionqueue * next;
271 struct Sessionqueue * prev;
272 struct Session * content;
276 * Queue for the fragments received
279 struct Receive_Fragment_Queue
281 struct Receive_Fragment_Queue * next;
282 struct Receive_Fragment_Queue * prev;
286 struct Radiotap_rx rxinfo;
290 * Queue for the fragments received
293 struct Receive_Message_Queue
295 struct Receive_Message_Queue * next;
297 struct Receive_Message_Queue * prev;
300 * current number for message incoming, to distinguish between the messages
302 uint32_t message_id_in;
305 * size of the message received,
306 * MESSAGE_LENGHT_UNKNOWN means that the size is not known,
307 * NO_MESSAGE_OR_MESSAGE_FINISHED means no message received
313 * Sorted queue with the fragments received; head
316 struct Receive_Fragment_Queue * frag_head;
319 * Sorted queue with the fragments received; tail
322 struct Receive_Fragment_Queue * frag_tail;
325 * Session this fragment belongs to
328 struct Session * session;
331 * Timeout value for the pending message.
333 struct GNUNET_TIME_Absolute timeout;
336 * Bitfield of received fragments
339 uint64_t received_fragments;
343 * Information kept for each message that is yet to
346 struct PendingMessage
350 * The pending message
355 * Size of the message
360 * Continuation function to call once the message
361 * has been sent. Can be NULL if there is no
362 * continuation to call.
364 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
367 * Cls for transmit_cont
369 void * transmit_cont_cls;
372 * Timeout value for the pending message.
374 struct GNUNET_TIME_Absolute timeout;
379 * Queue for acks to send for fragments recived
385 struct AckSendQueue * next;
386 struct AckSendQueue * prev;
388 struct Session * session;
390 * ID of message, to distinguish between the messages, picked randomly.
395 * Bit field for received fragments
397 uint64_t fragments_field;
402 * Session infos gathered from a messages
408 * the session this message belongs to
410 struct Session * session;
414 struct MacAddress addr;
418 * Session handle for connections.
426 struct SessionHeader header;
429 * Pointer to the global plugin struct.
431 struct Plugin *plugin;
434 * Message currently pending for transmission
435 * to this peer, if any.
437 struct PendingMessage *pending_message;
440 * Message currently pending for transmission
441 * to this peer, if any.
443 struct PendingMessage *pending_message2;
446 * To whom are we talking to (set to our identity
447 * if we are still waiting for the welcome message)
449 struct GNUNET_PeerIdentity target;
454 struct MacAddress addr;
457 * Address of the other peer (either based on our 'connect'
458 * call or on our 'accept' call).
463 * Last activity on this connection. Used to select preferred
466 struct GNUNET_TIME_Absolute last_activity;
469 * count of messages in the fragment out queue for this session
472 int fragment_messages_out_count;
475 * count of messages in the fragment in queue for this session
478 int fragment_messages_in_count;
488 * Struct for Messages in the fragment queue
491 struct FragmentMessage
494 * Session this message belongs to
497 struct Session *session;
500 * This is a doubly-linked list.
502 struct FragmentMessage *next;
505 * This is a doubly-linked list.
507 struct FragmentMessage *prev;
510 * The pending message
515 * Timeout value for the pending message.
517 struct GNUNET_TIME_Absolute timeout;
520 * Timeout value for the pending fragments.
521 * Stores the time when the next msg fragment ack has to be received
523 struct GNUNET_TIME_Absolute next_ack;
526 * bitfield with all acks received for this message
528 uint64_t ack_bitfield;
531 * Size of the message
536 * pos / next fragment number in the message, for fragmentation/segmentation,
537 * some acks can be missing but there is still time
539 uint32_t message_pos;
542 * current number for message outgoing, to distinguish between the messages
544 uint32_t message_id_out;
548 * Header for messages which need fragmentation
550 struct FragmentationAckHeader
553 struct GNUNET_MessageHeader header;
556 * ID of message, to distinguish between the messages, picked randomly.
558 uint32_t message_id GNUNET_PACKED;
561 * Offset or number of this fragment, for fragmentation/segmentation (design choice, TBD)
563 uint64_t fragment_field GNUNET_PACKED;
568 do_transmit(void *cls,
569 const struct GNUNET_SCHEDULER_TaskContext *tc);
574 * Sets a bit active in the bitArray. Increment bit-specific
575 * usage counter on disk only if below 4bit max (==15).
577 * @param bitArray memory area to set the bit in
578 * @param bitIdx which bit to set
581 setBit(char *bitArray, unsigned int bitIdx)
584 unsigned int targetBit;
586 arraySlot = bitIdx / 8;
587 targetBit = (1L << (bitIdx % 8));
588 bitArray[arraySlot] |= targetBit;
593 * Checks if a bit is active in the bitArray
595 * @param bitArray memory area to set the bit in
596 * @param bitIdx which bit to test
597 * @return GNUNET_YES if the bit is set, GNUNET_NO if not.
600 testBit(char *bitArray, unsigned int bitIdx)
603 unsigned int targetBit;
606 targetBit = (1L << (bitIdx % 8));
607 if (bitArray[slot] & targetBit)
613 * get the next message number, at the moment just a random one
614 * @return returns the next valid message-number for sending packets
617 get_next_message_id()
619 return GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
624 * search for a session with the addr
626 * @param plugin pointer to the plugin struct
627 * @param addr pointer to the mac address of the peer
628 * @return returns the session
630 static struct Session *
631 search_session(struct Plugin *plugin,
632 const struct MacAddress *addr)
634 struct Sessionqueue * queue = plugin->sessions;
636 while (queue != NULL)
638 GNUNET_assert (queue->content != NULL);
639 if (memcmp(addr, &queue->content->addr, sizeof (struct MacAddress)) == 0)
640 return queue->content; /* session found */
647 * create a new session
649 * @param plugin pointer to the plugin struct
650 * @param addr pointer to the mac address of the peer
651 * @return returns the session
654 static struct Session *
655 create_session(struct Plugin *plugin,
656 const struct MacAddress * addr)
658 struct Sessionqueue * queue = GNUNET_malloc (sizeof (struct Sessionqueue));
660 GNUNET_CONTAINER_DLL_insert_tail(plugin->sessions, plugin->sessions_tail, queue);
662 queue->content = GNUNET_malloc (sizeof (struct Session));
663 queue->content->plugin = plugin;
664 queue->content->addr = *addr;
665 queue->content->fragment_messages_out_count = 0;
666 queue->content->fragment_messages_in_count = 0;
668 plugin->session_count++;
671 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "New session %p with %s\n",
672 queue->content, wlan_plugin_address_to_string(NULL, addr, 6));
675 return queue->content;
680 * Get session from address, create if no session exists
682 * @param plugin pointer to the plugin struct
683 * @param addr pointer to the mac address of the peer
684 * @return returns the session
686 static struct Session *
687 get_Session (struct Plugin *plugin,
688 const struct MacAddress *addr)
690 struct Session * session = search_session(plugin, addr);
693 return create_session(plugin, addr);
698 * Queue the session to send data
702 queue_Session(struct Plugin *plugin, struct Session * session)
704 struct Sessionqueue * queue = plugin->pending_Sessions;
705 struct Sessionqueue * lastitem = NULL;
707 while (queue != NULL)
709 // content is never NULL
710 GNUNET_assert (queue->content != NULL);
711 // is session already in queue?
712 if (session == queue->content)
721 // Session is not in the queue
723 queue = GNUNET_malloc (sizeof (struct Sessionqueue));
724 queue->content = session;
727 GNUNET_CONTAINER_DLL_insert_after (plugin->pending_Sessions,
728 plugin->pending_Sessions_tail,
729 plugin->pending_Sessions_tail, queue);
730 plugin->pendingsessions++;
736 * Function to schedule the write task, executed after a delay
739 delay_fragment_task(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
741 struct Plugin * plugin = cls;
742 plugin->server_write_delay_task = GNUNET_SCHEDULER_NO_TASK;
744 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
747 // GNUNET_TIME_UNIT_FOREVER_REL is needed to clean up old msg
748 if (plugin->server_write_task == GNUNET_SCHEDULER_NO_TASK)
750 plugin->server_write_task = GNUNET_SCHEDULER_add_write_file(
751 GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdin_handle,
752 &do_transmit, plugin);
758 * Function to calculate the time of the next periodic "hello-beacon"
761 set_next_beacon_time(struct Plugin * const plugin)
763 //under 10 known peers: once a second
764 if (plugin->session_count < 10)
766 plugin->beacon_time = GNUNET_TIME_absolute_add(
767 GNUNET_TIME_absolute_get(), GNUNET_TIME_relative_multiply(
768 GNUNET_TIME_UNIT_SECONDS, HALLO_BEACON_SCALING_FACTOR));
770 //under 30 known peers: every 10 seconds
771 else if (plugin->session_count < 30)
773 plugin->beacon_time = GNUNET_TIME_absolute_add(
774 GNUNET_TIME_absolute_get(), GNUNET_TIME_relative_multiply(
775 GNUNET_TIME_UNIT_SECONDS, 10 * HALLO_BEACON_SCALING_FACTOR));
777 //over 30 known peers: once a minute
780 plugin->beacon_time = GNUNET_TIME_absolute_add(
781 GNUNET_TIME_absolute_get(), GNUNET_TIME_relative_multiply(
782 GNUNET_TIME_UNIT_MINUTES, HALLO_BEACON_SCALING_FACTOR));
787 static struct GNUNET_TIME_Relative
788 get_next_frag_timeout(struct FragmentMessage * fm)
790 return GNUNET_TIME_relative_min(GNUNET_TIME_absolute_get_remaining(
791 fm->next_ack), GNUNET_TIME_absolute_get_remaining(fm->timeout));
796 * Function to get the timeout value for acks for this session
799 static struct GNUNET_TIME_Relative
800 get_ack_timeout(struct FragmentMessage * fm)
802 return FRAGMENT_TIMEOUT;
806 * Function to set the timer for the next timeout of the fragment queue
807 * @param plugin the handle to the plugin struct
810 check_next_fragment_timeout(struct Plugin * const plugin)
812 struct FragmentMessage * fm;
813 struct GNUNET_TIME_Relative next_send;
816 if (plugin->server_write_delay_task != GNUNET_SCHEDULER_NO_TASK)
818 GNUNET_SCHEDULER_cancel(plugin->server_write_delay_task);
819 plugin->server_write_delay_task = GNUNET_SCHEDULER_NO_TASK;
821 fm = plugin->pending_Fragment_Messages_head;
823 GNUNET_assert(plugin->server_write_delay_task == GNUNET_SCHEDULER_NO_TASK);
825 //check if some acks are in the queue
826 if (plugin->ack_send_queue_head != NULL)
828 next_send = GNUNET_TIME_UNIT_ZERO;
830 //check if there are some fragments in the queue
833 next_send = GNUNET_TIME_absolute_get_remaining(plugin->beacon_time);
836 next_send = GNUNET_TIME_relative_min(next_send,
837 get_next_frag_timeout(fm));
840 plugin->server_write_delay_task = GNUNET_SCHEDULER_add_delayed(next_send,
841 &delay_fragment_task, plugin);
846 * Function to get the next queued Session, removes the session from the queue
849 static struct Session *
850 get_next_queue_Session(struct Plugin * plugin)
852 struct Session * session;
853 struct Sessionqueue * sessionqueue;
854 struct Sessionqueue * sessionqueue_alt;
855 struct PendingMessage * pm;
856 sessionqueue = plugin->pending_Sessions;
857 while (sessionqueue != NULL)
859 session = sessionqueue->content;
861 pm = session->pending_message;
865 GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
866 "pending message is empty, should not happen. session %p\n",
870 GNUNET_assert(pm != NULL);
872 //check for message timeout
873 if (GNUNET_TIME_absolute_get_remaining(pm->timeout).rel_value > 0)
875 //check if session has no message in the fragment queue
876 if (session->fragment_messages_out_count
877 < FRAGMENT_QUEUE_MESSAGES_OUT_PER_SESSION)
879 plugin->pendingsessions--;
880 GNUNET_CONTAINER_DLL_remove (plugin->pending_Sessions,
881 plugin->pending_Sessions_tail, sessionqueue);
882 GNUNET_free(sessionqueue);
888 sessionqueue = sessionqueue->next;
894 session->pending_message = session->pending_message2;
895 session->pending_message2 = NULL;
897 //call the cont func that it did not work
898 if (pm->transmit_cont != NULL)
899 pm->transmit_cont(pm->transmit_cont_cls, &(session->target),
901 GNUNET_free(pm->msg);
904 if (session->pending_message == NULL)
906 sessionqueue_alt = sessionqueue;
907 sessionqueue = sessionqueue->next;
908 plugin->pendingsessions--;
909 GNUNET_CONTAINER_DLL_remove (plugin->pending_Sessions,
910 plugin->pending_Sessions_tail, sessionqueue_alt);
912 GNUNET_free(sessionqueue_alt);
922 * Function to sort the message into the message fragment queue
923 * @param plugin the plugin struct
924 * @param fm message to sort into the queue
927 sort_fragment_into_queue(struct Plugin * plugin, struct FragmentMessage * fm)
929 struct FragmentMessage * fm2;
930 //sort into the list at the right position
932 fm2 = plugin->pending_Fragment_Messages_head;
936 if (GNUNET_TIME_absolute_get_difference(fm2->next_ack, fm->next_ack).rel_value
939 GNUNET_CONTAINER_DLL_insert_before(plugin->pending_Fragment_Messages_head,
940 plugin->pending_Fragment_Messages_tail,fm2,fm);
949 GNUNET_CONTAINER_DLL_insert_tail(plugin->pending_Fragment_Messages_head,
950 plugin->pending_Fragment_Messages_tail,fm);
954 * frees the space of a message in the fragment queue (send queue)
955 * @param plugin the plugin struct
956 * @param fm message to free
959 free_fragment_message(struct Plugin * plugin, struct FragmentMessage * fm)
963 (fm->session->fragment_messages_out_count)--;
964 GNUNET_free_non_null(fm->msg);
965 GNUNET_CONTAINER_DLL_remove (plugin->pending_Fragment_Messages_head,
966 plugin->pending_Fragment_Messages_tail, fm);
968 plugin->pending_fragment_messages--;
971 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
972 "free pending fragment messages, pending messages remaining %u\n",
973 plugin->pending_fragment_messages);
979 * Function to check if there is some space in the fragment queue
980 * inserts a message if space is available
981 * @param plugin the plugin struct
985 check_fragment_queue(struct Plugin * plugin)
987 struct Session * session;
988 struct FragmentMessage * fm;
989 struct GNUNET_PeerIdentity pid;
991 struct PendingMessage * pm;
993 if (plugin->pending_fragment_messages < FRAGMENT_QUEUE_SIZE)
995 session = get_next_queue_Session(plugin);
998 pm = session->pending_message;
999 session->pending_message = NULL;
1000 session->fragment_messages_out_count++;
1001 GNUNET_assert(pm != NULL);
1003 fm = GNUNET_malloc(sizeof(struct FragmentMessage));
1004 fm->message_size = pm->message_size;
1006 fm->session = session;
1007 fm->timeout.abs_value = pm->timeout.abs_value;
1008 fm->message_pos = 0;
1009 fm->next_ack = GNUNET_TIME_absolute_get();
1010 fm->message_id_out = get_next_message_id();
1011 fm->ack_bitfield = 0;
1013 sort_fragment_into_queue(plugin, fm);
1014 plugin->pending_fragment_messages++;
1016 if (pm->transmit_cont != NULL)
1018 pid = session->target;
1019 pm->transmit_cont(pm->transmit_cont_cls, &pid, GNUNET_OK);
1021 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1022 "called pm->transmit_cont for %p\n", session);
1028 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1029 "no pm->transmit_cont for %p\n", session);
1034 if (session->pending_message2 != NULL)
1036 session->pending_message = session->pending_message2;
1037 session->pending_message2 = NULL;
1039 queue_Session(plugin, session);
1042 //check if timeout changed
1043 check_next_fragment_timeout(plugin);
1049 * Funktion to check if all fragments where send and the acks received
1050 * frees the space if finished
1051 * @param plugin the plugin struct
1052 * @param fm the message to check
1055 check_finished_fragment(struct Plugin * plugin, struct FragmentMessage * fm)
1057 //maxack = size of message / max packet size, eg 12 / 5 = 2 start at 0 so ack numbers are 0,1,2
1058 unsigned int maxack = 63 - ((fm->message_size - 1) / (WLAN_MTU
1059 - sizeof(struct FragmentationHeader)));
1060 uint64_t tmpfield = UINT64_MAX;
1061 tmpfield = tmpfield >> maxack;
1065 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1066 "Test bitfields %X and %X, maxack is %u, fm size %u\n",
1067 fm->ack_bitfield, tmpfield, maxack, fm->message_size);
1070 if (fm->ack_bitfield == tmpfield)
1073 free_fragment_message(plugin, fm);
1076 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1077 "Finished sending and got all acks for a fragmented message\n");
1080 check_next_fragment_timeout(plugin);
1081 check_fragment_queue(plugin);
1087 * Function to set the next fragment number
1088 * @param fm use this FragmentMessage
1092 set_next_message_fragment_pos(struct FragmentMessage * fm)
1095 //check if retransmit is needed
1096 if (GNUNET_TIME_absolute_get_remaining(fm->next_ack).rel_value == 0)
1099 // be positive and try again later :-D
1100 fm->next_ack = GNUNET_TIME_relative_to_absolute(get_ack_timeout(fm));
1101 // find first missing fragment
1103 fm->message_pos = 0;
1106 //test if ack 0 (or X) was already received
1107 while (testBit((char*) &fm->ack_bitfield, fm->message_pos) == GNUNET_YES)
1115 getRadiotapHeader(struct Plugin * plugin, struct Session * session,
1116 struct Radiotap_Send * header)
1119 if (session != NULL)
1121 header->rate = session->rate;
1122 header->tx_power = session->tx_power;
1123 header->antenna = session->antenna;
1128 header->tx_power = 0;
1129 header->antenna = 0;
1137 * function to generate the wlan hardware header for one packet
1138 * @param Header address to write the header to
1139 * @param to_mac_addr address of the recipient
1140 * @param plugin pointer to the plugin struct
1141 * @return GNUNET_YES if there was no error
1144 getWlanHeader(struct ieee80211_frame * Header,
1145 const struct MacAddress * to_mac_addr,
1146 struct Plugin * plugin)
1148 Header->i_fc[0] = 0x80;
1149 Header->i_fc[1] = 0x00;
1150 memcpy(&Header->i_addr3, &mac_bssid, sizeof(mac_bssid));
1151 memcpy(&Header->i_addr2, plugin->mac_address.mac, sizeof(plugin->mac_address));
1152 memcpy(&Header->i_addr1, to_mac_addr, sizeof(plugin->mac_address));
1159 * @param msgbuf pointer tor the data
1160 * @param msgbuf_size size of the data
1162 * @return 32bit crc value
1166 getcrc32(const char *msgbuf, size_t msgbuf_size)
1168 //TODO calc some crc
1175 * @param msgbuf pointer tor the data
1176 * @param msgbuf_size size of the data
1178 * @return 16bit crc value
1182 getcrc16(const char *msgbuf, size_t msgbuf_size)
1184 //TODO calc some crc
1190 send_hello_beacon(struct Plugin * plugin)
1194 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sending hello beacon\n");
1199 struct GNUNET_MessageHeader * msgheader;
1200 struct ieee80211_frame * ieeewlanheader;
1201 struct Radiotap_Send * radioHeader;
1202 struct GNUNET_MessageHeader * msgheader2;
1204 GNUNET_assert(sizeof(struct WlanHeader) + GNUNET_HELLO_size(
1205 *(plugin->env->our_hello)) <= WLAN_MTU);
1206 size = sizeof(struct GNUNET_MessageHeader) + sizeof(struct Radiotap_Send)
1207 + sizeof(struct ieee80211_frame) + sizeof(struct GNUNET_MessageHeader)
1208 + GNUNET_HELLO_size(*(plugin->env->our_hello));
1210 msgheader = GNUNET_malloc(size);
1211 msgheader->size = htons(size);
1212 msgheader->type = htons(GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA);
1214 radioHeader = (struct Radiotap_Send*) &msgheader[1];
1215 getRadiotapHeader(plugin, NULL, radioHeader);
1216 ieeewlanheader = (struct ieee80211_frame*) &radioHeader[1];
1217 getWlanHeader(ieeewlanheader, &bc_all_mac, plugin);
1219 msgheader2 = (struct GNUNET_MessageHeader*) &ieeewlanheader[1];
1220 msgheader2->size = htons(GNUNET_HELLO_size(*(plugin->env->our_hello))
1221 + sizeof(struct GNUNET_MessageHeader));
1223 msgheader2->type = htons(GNUNET_MESSAGE_TYPE_WLAN_ADVERTISEMENT);
1224 memcpy(&msgheader2[1], *plugin->env->our_hello, GNUNET_HELLO_size(
1225 *(plugin->env->our_hello)));
1227 bytes = GNUNET_DISK_file_write(plugin->server_stdin_handle, msgheader, size);
1229 if (bytes == GNUNET_SYSERR)
1231 GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
1232 _("Error writing to wlan healper. errno == %d, ERROR: %s\n"),
1233 errno, strerror(errno));
1236 GNUNET_assert(bytes != GNUNET_SYSERR);
1237 GNUNET_assert(bytes == size);
1238 GNUNET_free(msgheader);
1240 set_next_beacon_time(plugin);
1241 check_next_fragment_timeout(plugin);
1245 send_ack(struct Plugin * plugin, struct AckSendQueue * ack)
1250 struct GNUNET_MessageHeader * msgheader = NULL;
1251 struct ieee80211_frame * ieeewlanheader = NULL;
1252 struct Radiotap_Send * radioHeader = NULL;
1253 struct FragmentationAckHeader * msgheader2 = NULL;
1255 GNUNET_assert(sizeof(struct FragmentationAckHeader) <= WLAN_MTU);
1257 size = sizeof(struct GNUNET_MessageHeader) + sizeof(struct Radiotap_Send)
1258 + sizeof(struct ieee80211_frame) + sizeof(struct FragmentationAckHeader);
1261 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1262 "Sending ack for message_id %u with fragment field %u, size %u\n",
1263 ack->message_id, ack->fragments_field, size
1264 - sizeof(struct Radiotap_Send));
1267 msgheader = GNUNET_malloc(size);
1268 msgheader->size = htons(size);
1269 msgheader->type = htons(GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA);
1271 radioHeader = (struct Radiotap_Send*) &msgheader[1];
1272 getRadiotapHeader(plugin, ack->session, radioHeader);
1273 ieeewlanheader = (struct ieee80211_frame*) &radioHeader[1];
1274 getWlanHeader(ieeewlanheader, &ack->session->addr, plugin);
1276 msgheader2 = (struct FragmentationAckHeader*) &ieeewlanheader[1];
1277 msgheader2->header.size = htons(sizeof(struct FragmentationAckHeader));
1278 msgheader2->header.type = htons(GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT_ACK);
1279 msgheader2->message_id = htonl(ack->message_id);
1280 msgheader2->fragment_field = GNUNET_htonll(ack->fragments_field);
1282 bytes = GNUNET_DISK_file_write(plugin->server_stdin_handle, msgheader, size);
1283 if (bytes == GNUNET_SYSERR)
1285 GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
1286 _("Error writing to wlan healper. errno == %d, ERROR: %s\n"),
1287 errno, strerror(errno));
1290 GNUNET_assert(bytes != GNUNET_SYSERR);
1291 GNUNET_assert(bytes == size);
1292 GNUNET_free(msgheader);
1293 check_next_fragment_timeout(plugin);
1297 finish_sending(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1299 struct Finish_send * finish;
1300 struct Plugin * plugin;
1304 plugin = finish->plugin;
1306 plugin->server_write_task = GNUNET_SCHEDULER_NO_TASK;
1308 bytes = GNUNET_DISK_file_write(plugin->server_stdin_handle,
1309 finish->msgheader, finish->size);
1310 GNUNET_assert(bytes != GNUNET_SYSERR);
1312 GNUNET_assert(plugin->server_write_task == GNUNET_SCHEDULER_NO_TASK);
1313 if (bytes != finish->size)
1316 finish->msgheader = finish->msgheader + bytes;
1317 finish->size = finish->size - bytes;
1318 plugin->server_write_task = GNUNET_SCHEDULER_add_write_file(
1319 GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdin_handle,
1320 &finish_sending, finish);
1324 GNUNET_free(finish->msgstart);
1325 GNUNET_free(finish);
1326 check_next_fragment_timeout(plugin);
1334 * Function called when wlan helper is ready to get some data
1336 * @param cls closure
1337 * @param tc GNUNET_SCHEDULER_TaskContext
1340 do_transmit(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1343 struct Plugin * plugin = cls;
1344 plugin->server_write_task = GNUNET_SCHEDULER_NO_TASK;
1346 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1349 struct Session * session = NULL;
1350 struct FragmentMessage * fm = NULL;
1351 struct ieee80211_frame * ieeewlanheader = NULL;
1352 struct Radiotap_Send * radioHeader = NULL;
1353 struct GNUNET_MessageHeader * msgheader = NULL;
1355 struct FragmentationHeader fragheader;
1356 struct FragmentationHeader * fragheaderptr = NULL;
1357 struct Finish_send * finish = NULL;
1358 struct AckSendQueue * ack;
1361 const char * copystart = NULL;
1362 uint16_t copysize = 0;
1363 uint copyoffset = 0;
1365 if (plugin->ack_send_queue_head != NULL)
1367 ack = plugin->ack_send_queue_head;
1368 GNUNET_CONTAINER_DLL_remove(plugin->ack_send_queue_head,
1369 plugin->ack_send_queue_tail, ack);
1370 send_ack(plugin, ack);
1375 //test if a "hello-beacon" has to be send
1376 if (GNUNET_TIME_absolute_get_remaining(plugin->beacon_time).rel_value == 0)
1378 send_hello_beacon(plugin);
1384 fm = plugin->pending_Fragment_Messages_head;
1387 session = fm->session;
1388 GNUNET_assert(session != NULL);
1390 // test if message timed out
1391 if (GNUNET_TIME_absolute_get_remaining(fm->timeout).rel_value == 0)
1394 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "message timeout\n");
1397 check_fragment_queue(plugin);
1398 free_fragment_message(plugin, fm);
1404 //if (fm->message_size > WLAN_MTU)
1406 size = sizeof(struct FragmentationHeader);
1408 set_next_message_fragment_pos(fm);
1410 copyoffset = (WLAN_MTU - sizeof(struct FragmentationHeader))
1415 fragheader.fragment_off_or_num = htons(fm->message_pos);
1416 fragheader.message_id = htonl(fm->message_id_out);
1417 copystart = fm->msg + copyoffset;
1418 copysize = GNUNET_MIN(fm->message_size - copyoffset,
1419 WLAN_MTU - sizeof(struct FragmentationHeader));
1423 GNUNET_ERROR_TYPE_DEBUG,
1424 "Sending GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT with message_id %u with fragment number %i, size: %u, offset %u, time until timeout %u\n",
1425 fm->message_id_out, fm->message_pos, copysize
1426 + sizeof(struct FragmentationHeader), copyoffset,
1427 GNUNET_TIME_absolute_get_remaining(fm->timeout));
1430 if (copyoffset >= fm->message_size)
1433 GNUNET_ERROR_TYPE_ERROR,
1434 "offset in message for fragment too large, offset %u, size %u, max size %u, copysize %u, message_pos %u,\n",
1435 copyoffset, fm->message_size, WLAN_MTU
1436 - sizeof(struct FragmentationHeader), copysize,
1439 GNUNET_assert(copyoffset < fm->message_size);
1440 //FIXME remove later
1441 GNUNET_assert(copystart < fm->msg + fm->message_size);
1443 fragheader.header.size = htons(copysize
1444 + sizeof(struct FragmentationHeader));
1445 fragheader.header.type = htons(GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT);
1450 // there is no need to split
1451 copystart = fm->msg;
1452 copysize = fm->message_size;
1456 size += sizeof(struct Radiotap_Send) + sizeof(struct ieee80211_frame)
1457 + sizeof(struct GNUNET_MessageHeader);
1458 msgheader = GNUNET_malloc(size);
1459 msgheader->size = htons(size);
1460 msgheader->type = htons(GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA);
1462 radioHeader = (struct Radiotap_Send*) &msgheader[1];
1463 getRadiotapHeader(plugin, session, radioHeader);
1465 ieeewlanheader = (struct ieee80211_frame *) &radioHeader[1];
1466 getWlanHeader(ieeewlanheader, &fm->session->addr, plugin);
1468 //could be faster if content is just send and not copyed before
1469 //fragmentheader is needed
1470 //if (fm->message_size > WLAN_MTU)
1472 fragheader.message_crc = htons(getcrc16(copystart, copysize));
1473 memcpy(&ieeewlanheader[1], &fragheader,
1474 sizeof(struct FragmentationHeader));
1475 fragheaderptr = (struct FragmentationHeader *) &ieeewlanheader[1];
1476 memcpy(&fragheaderptr[1], copystart, copysize);
1480 memcpy(&ieeewlanheader[1], copystart, copysize);
1483 bytes = GNUNET_DISK_file_write(plugin->server_stdin_handle,
1485 if (bytes == GNUNET_SYSERR)
1488 GNUNET_ERROR_TYPE_ERROR,
1489 _("Error writing to wlan healper. errno == %d, ERROR: %s\n"),
1490 errno, strerror(errno));
1493 GNUNET_assert(bytes != GNUNET_SYSERR);
1497 finish = GNUNET_malloc(sizeof( struct Finish_send));
1498 finish->plugin = plugin;
1499 finish->msgheader = (char *) msgheader + bytes;
1500 finish->size = size - bytes;
1501 finish->msgstart = msgheader;
1503 GNUNET_assert(plugin->server_write_task == GNUNET_SCHEDULER_NO_TASK);
1505 plugin->server_write_task = GNUNET_SCHEDULER_add_write_file(
1506 GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdin_handle,
1507 &finish_sending, finish);
1512 GNUNET_assert(bytes == size);
1514 GNUNET_free(msgheader);
1515 check_next_fragment_timeout(plugin);
1518 //check if this was the last fragment of this message, if true then queue at the end of the list
1519 if (copysize + copyoffset >= fm->message_size)
1521 GNUNET_assert(copysize + copyoffset == fm->message_size);
1523 GNUNET_CONTAINER_DLL_remove (plugin->pending_Fragment_Messages_head,
1524 plugin->pending_Fragment_Messages_tail, fm);
1526 GNUNET_CONTAINER_DLL_insert_tail(plugin->pending_Fragment_Messages_head,
1527 plugin->pending_Fragment_Messages_tail, fm);
1528 // if fragments have opimized timeouts
1529 //sort_fragment_into_queue(plugin,fm);
1536 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1537 "do_transmit did nothing, should not happen!\n");
1542 * Another peer has suggested an address for this
1543 * peer and transport plugin. Check that this could be a valid
1544 * address. If so, consider adding it to the list
1547 * @param cls closure
1548 * @param addr pointer to the address
1549 * @param addrlen length of addr
1550 * @return GNUNET_OK if this is a plausible address for this peer
1554 wlan_plugin_address_suggested(void *cls, const void *addr, size_t addrlen)
1556 //struct Plugin *plugin = cls;
1558 /* check if the address is plausible; if so,
1559 add it to our list! */
1561 GNUNET_assert(cls !=NULL);
1562 //FIXME mitm is not checked
1563 //Mac Address has 6 bytes
1566 /* TODO check for bad addresses like multicast, broadcast, etc */
1570 return GNUNET_SYSERR;
1576 * Function that can be used by the transport service to transmit
1577 * a message using the plugin.
1579 * @param cls closure
1580 * @param target who should receive this message
1581 * @param priority how important is the message
1582 * @param msgbuf the message to transmit
1583 * @param msgbuf_size number of bytes in 'msgbuf'
1584 * @param timeout when should we time out
1585 * @param session which session must be used (or NULL for "any")
1586 * @param addr the address to use (can be NULL if the plugin
1587 * is "on its own" (i.e. re-use existing TCP connection))
1588 * @param addrlen length of the address in bytes
1589 * @param force_address GNUNET_YES if the plugin MUST use the given address,
1590 * otherwise the plugin may use other addresses or
1591 * existing connections (if available)
1592 * @param cont continuation to call once the message has
1593 * been transmitted (or if the transport is ready
1594 * for the next transmission call; or if the
1595 * peer disconnected...)
1596 * @param cont_cls closure for cont
1597 * @return number of bytes used (on the physical network, with overheads);
1598 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1599 * and does NOT mean that the message was not transmitted (DV)
1602 wlan_plugin_send(void *cls, const struct GNUNET_PeerIdentity * target,
1603 const char *msgbuf, size_t msgbuf_size, unsigned int priority,
1604 struct GNUNET_TIME_Relative timeout, struct Session *session,
1605 const void *addr, size_t addrlen, int force_address,
1606 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1608 struct Plugin * plugin = cls;
1609 struct PendingMessage * newmsg = NULL;
1610 struct WlanHeader * wlanheader = NULL;
1612 //check if msglen > 0
1613 GNUNET_assert(msgbuf_size > 0);
1615 //get session if needed
1616 if (session == NULL)
1618 if (wlan_plugin_address_suggested(plugin, addr, addrlen) == GNUNET_OK)
1620 session = get_Session(plugin, addr);
1624 GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
1625 _("Wlan Address len %d is wrong\n"), addrlen);
1630 //TODO target "problem" not solved
1631 //if (session->target != NULL){
1632 // GNUNET_assert(session->target == *target);
1634 session->target = *target;
1640 //queue message in session
1641 //test if there is no other message in the "queue"
1642 //FIXME: to many send requests
1643 //GNUNET_assert (session->pending_message == NULL);
1644 if (session->pending_message != NULL)
1646 newmsg = session->pending_message;
1648 GNUNET_ERROR_TYPE_ERROR,
1649 "wlan_plugin_send: a pending message is already in the queue for this client\n remaining time to send this message is %u, queued fragment messages %u\n",
1650 GNUNET_TIME_absolute_get_remaining(newmsg->timeout).rel_value,
1651 session->fragment_messages_out_count);
1652 if (session->pending_message2 != NULL)
1655 GNUNET_ERROR_TYPE_ERROR,
1656 "wlan_plugin_send: two pending messages are already in the queue for this client\n");
1661 newmsg = GNUNET_malloc(sizeof(struct PendingMessage));
1662 (newmsg->msg) = GNUNET_malloc(msgbuf_size + sizeof(struct WlanHeader));
1663 wlanheader = (struct WlanHeader *) newmsg->msg;
1664 //copy msg to buffer, not fragmented / segmented yet, but with message header
1665 wlanheader->header.size = htons(msgbuf_size + sizeof(struct WlanHeader));
1666 wlanheader->header.type = htons(GNUNET_MESSAGE_TYPE_WLAN_DATA);
1667 memcpy(&(wlanheader->target), target, sizeof(struct GNUNET_PeerIdentity));
1668 wlanheader->crc = htonl(getcrc32(msgbuf, msgbuf_size));
1669 memcpy(&wlanheader[1], msgbuf, msgbuf_size);
1670 newmsg->transmit_cont = cont;
1671 newmsg->transmit_cont_cls = cont_cls;
1672 newmsg->timeout = GNUNET_TIME_relative_to_absolute(timeout);
1674 newmsg->timeout.abs_value = newmsg->timeout.abs_value - 500;
1676 newmsg->message_size = msgbuf_size + sizeof(struct WlanHeader);
1678 if (session->pending_message == NULL)
1680 session->pending_message = newmsg;
1684 session->pending_message2 = newmsg;
1688 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1689 "New message for %p with size (incl wlan header) %u added\n", session,
1690 newmsg->message_size);
1694 queue_Session(plugin, session);
1696 check_fragment_queue(plugin);
1697 //FIXME not the correct size
1703 * function to get the first message in the fragement queue (out) of a session
1704 * @param session pointer to the session
1705 * @return pointer to the struct FragmentMessage
1707 static struct FragmentMessage *
1708 get_fragment_message_from_session(struct Session * session)
1710 struct FragmentMessage * fm = session->plugin->pending_Fragment_Messages_head;
1713 if (fm->session == session)
1723 * function to get the message in the fragement queue (out) of a session with a specific id
1724 * @param session pointer to the session
1725 * @param message_id id of the message
1726 * @return pointer to the struct FragmentMessage
1728 static struct FragmentMessage *
1729 get_fragment_message_from_session_and_id(struct Session * session,
1730 uint32_t message_id)
1732 struct FragmentMessage * fm = session->plugin->pending_Fragment_Messages_head;
1735 if ((fm->session == session) && (fm->message_id_out == message_id))
1746 * function to get the receive message of a session
1747 * @param plugin pointer to the plugin struct
1748 * @param session session this fragment belongs to
1750 struct Receive_Message_Queue *
1751 get_receive_message_from_session(struct Plugin * plugin,
1752 struct Session * session)
1754 struct Receive_Message_Queue * rec_message = plugin->receive_messages_head;
1755 while (rec_message != NULL)
1757 if (rec_message->session == session)
1761 rec_message = rec_message->next;
1768 * Function to dispose the fragments received for a message and the message
1769 * @param plugin pointer to the plugin struct
1770 * @param rec_message pointer to the struct holding the message which should be freed
1773 free_receive_message(struct Plugin* plugin,
1774 struct Receive_Message_Queue * rx_message)
1776 GNUNET_assert(rx_message !=NULL);
1777 struct Receive_Fragment_Queue * rec_queue = rx_message->frag_head;
1778 struct Receive_Fragment_Queue * rec_queue2;
1780 while (rec_queue != NULL)
1782 rec_queue2 = rec_queue;
1783 rec_queue = rec_queue->next;
1784 GNUNET_free(rec_queue2);
1787 GNUNET_CONTAINER_DLL_remove(plugin->receive_messages_head,plugin->receive_messages_teil, rx_message);
1789 GNUNET_assert(plugin->pending_receive_messages > 0);
1790 GNUNET_assert(rx_message->session->fragment_messages_in_count > 0);
1792 plugin->pending_receive_messages--;
1793 rx_message->session->fragment_messages_in_count--;
1794 GNUNET_free(rx_message);
1799 * Function that can be used to force the plugin to disconnect
1800 * from the given peer and cancel all previous transmissions
1801 * (and their continuation).
1803 * @param cls closure
1804 * @param target peer from which to disconnect
1807 wlan_plugin_disconnect(void *cls, const struct GNUNET_PeerIdentity *target)
1809 struct Plugin *plugin = cls;
1810 struct Sessionqueue * queue = plugin->sessions;
1811 struct Sessionqueue * pendingsession = plugin->pending_Sessions;
1812 struct PendingMessage * pm = NULL;
1813 struct FragmentMessage * fm;
1814 struct Receive_Message_Queue * receive_queue;
1816 // just look at all the session for the needed one
1817 while (queue != NULL)
1819 // content is never NULL
1820 GNUNET_assert (queue->content != NULL);
1821 if (memcmp(target, &(queue->content->target),
1822 sizeof(struct GNUNET_PeerIdentity)) == 0)
1825 //is this session pending for send
1826 while (pendingsession != NULL)
1828 if (pendingsession->content == queue->content)
1830 plugin->pendingsessions--;
1831 GNUNET_CONTAINER_DLL_remove (plugin->pending_Sessions,
1832 plugin->pending_Sessions_tail, pendingsession);
1833 GNUNET_free(pendingsession);
1836 pendingsession = pendingsession->next;
1839 //is something of this session in the fragment queue?
1840 fm = get_fragment_message_from_session(queue->content);
1843 free_fragment_message(plugin, fm);
1844 fm = get_fragment_message_from_session(queue->content);
1846 check_next_fragment_timeout(plugin);
1848 //dispose all received fragments
1849 receive_queue = get_receive_message_from_session(plugin,
1851 while (receive_queue != NULL)
1853 free_receive_message(plugin, receive_queue);
1854 receive_queue = get_receive_message_from_session(plugin,
1858 // remove PendingMessage
1859 pm = queue->content->pending_message;
1862 GNUNET_free_non_null(pm->msg);
1866 GNUNET_free(queue->content);
1867 GNUNET_CONTAINER_DLL_remove(plugin->sessions, plugin->sessions_tail, queue);
1869 plugin->session_count--;
1874 queue = queue->next;
1879 * Convert the transports address to a nice, human-readable
1882 * @param cls closure
1883 * @param type name of the transport that generated the address
1884 * @param addr one of the addresses of the host, NULL for the last address
1885 * the specific address format depends on the transport
1886 * @param addrlen length of the address
1887 * @param numeric should (IP) addresses be displayed in numeric form?
1888 * @param timeout after how long should we give up?
1889 * @param asc function to call on each string
1890 * @param asc_cls closure for asc
1893 wlan_plugin_address_pretty_printer(void *cls, const char *type,
1894 const void *addr, size_t addrlen, int numeric,
1895 struct GNUNET_TIME_Relative timeout,
1896 GNUNET_TRANSPORT_AddressStringCallback asc, void *asc_cls)
1899 const unsigned char * input;
1901 //GNUNET_assert(cls !=NULL);
1904 /* invalid address (MAC addresses have 6 bytes) */
1909 input = (const unsigned char*) addr;
1910 GNUNET_snprintf(ret, sizeof(ret),
1911 "%s Mac-Address %.2X:%.2X:%.2X:%.2X:%.2X:%.2X", PROTOCOL_PREFIX,
1912 input[0], input[1], input[2], input[3], input[4], input[5]);
1919 * Function called for a quick conversion of the binary address to
1920 * a numeric address. Note that the caller must not free the
1921 * address and that the next call to this function is allowed
1922 * to override the address again.
1924 * @param cls closure
1925 * @param addr binary address
1926 * @param addrlen length of the address
1927 * @return string representing the same address
1930 wlan_plugin_address_to_string(void *cls, const void *addr, size_t addrlen)
1932 static char ret[40];
1933 const struct MacAddress *mac;
1935 if (addrlen != sizeof(struct MacAddress))
1941 GNUNET_snprintf(ret, sizeof(ret), "%s Mac-Address %X:%X:%X:%X:%X:%X",
1942 PROTOCOL_PREFIX, mac->mac[0], mac->mac[1], mac->mac[2], mac->mac[3],
1943 mac->mac[4], mac->mac[5]);
1948 * function to check if bitfield is representation of fragments of the message
1949 * @param rec_message message to check
1953 check_message_fragment_bitfield(struct Receive_Message_Queue * rec_message)
1955 uint64_t checkfragments = 0;
1956 struct Receive_Fragment_Queue * rec_queue = rec_message->frag_head;
1958 while (rec_queue != NULL)
1960 setBit((char*) &checkfragments, rec_queue->num);
1961 rec_queue = rec_queue->next;
1964 GNUNET_assert(checkfragments == rec_message->received_fragments);
1968 * Function to test if fragment number already exists in the fragments received
1970 * @param rec_message message this fragment belongs to
1971 * @param fh Fragmentheader of the fragment
1972 * @return GNUNET_YES if fragment exists already, GNUNET_NO if it does not exists in the queue of the session
1976 is_double_msg(struct Receive_Message_Queue * rec_message,
1977 struct FragmentationHeader * fh)
1979 //test if bitfield is okay
1981 check_message_fragment_bitfield(rec_message);
1984 return testBit((char *) &rec_message->received_fragments, ntohs(
1985 fh->fragment_off_or_num));
1990 * Function to insert a fragment in a queue of a message
1991 * @param session session the fragment belongs to
1992 * @param rec_queue fragment to add
1996 insert_fragment_in_queue(struct Receive_Message_Queue * rx_message,
1997 struct Receive_Fragment_Queue * rx_frag)
1999 GNUNET_assert(rx_message != NULL);
2000 GNUNET_assert(rx_frag != NULL);
2002 struct Receive_Fragment_Queue * rx_frag2 = rx_message->frag_head;
2003 struct WlanHeader * wlanheader = NULL;
2006 //this is the first fragment of the message (fragment id 0)
2007 if (rx_frag->num == 0)
2009 wlanheader = (struct WlanHeader *) rx_frag->msg;
2010 rx_message->rec_size = ntohs(wlanheader->header.size);
2014 while (rx_frag2 != NULL)
2016 if (rx_frag2->num > rx_frag->num)
2018 //next element number is grater than the current num
2019 GNUNET_CONTAINER_DLL_insert_before(rx_message->frag_head, rx_message->frag_tail, rx_frag2, rx_frag);
2020 setBit((char *) &rx_message->received_fragments, rx_frag->num);
2023 rx_frag2 = rx_frag2->next;
2026 //no element has a grater number
2027 GNUNET_CONTAINER_DLL_insert_tail(rx_message->frag_head, rx_message->frag_tail, rx_frag);
2029 setBit((char *) &rx_message->received_fragments, rx_frag->num);
2037 * handels the data after all fragments are put together
2039 * @param session_light
2040 * @param hdr pointer to the data
2043 wlan_data_massage_handler(struct Plugin * plugin,
2044 struct Session_light * session_light,
2045 const struct GNUNET_MessageHeader * hdr)
2047 struct WlanHeader * wlanheader = NULL;
2048 struct Session * session = NULL;
2049 const char * tempmsg = NULL;
2050 const struct GNUNET_MessageHeader * temp_hdr = NULL;
2051 struct GNUNET_PeerIdentity tmptarget;
2053 if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_DATA)
2058 GNUNET_ERROR_TYPE_DEBUG,
2059 "Func wlan_data_massage_handler got GNUNET_MESSAGE_TYPE_WLAN_DATA size: %u\n",
2063 if (ntohs(hdr->size) < sizeof(struct WlanHeader)
2064 + sizeof(struct GNUNET_MessageHeader))
2066 //packet not big enought
2070 GNUNET_assert(session_light != NULL);
2071 if (session_light->session == NULL)
2073 session_light->session = search_session(plugin, &session_light->addr);
2075 session = session_light->session;
2076 wlanheader = (struct WlanHeader *) hdr;
2078 tempmsg = (char*) &wlanheader[1];
2079 temp_hdr = (const struct GNUNET_MessageHeader *) &wlanheader[1];
2081 if (getcrc32(tempmsg, ntohs(wlanheader->header.size)) != ntohl(
2084 //wrong crc, dispose message
2085 GNUNET_log(GNUNET_ERROR_TYPE_INFO,
2086 "Wlan message Header crc was wrong\n");
2090 //if not in session list
2091 if (session == NULL)
2095 GNUNET_ERROR_TYPE_DEBUG,
2096 "WLAN client not in session list: packet size = %u, inner size = %u, header size = %u\n",
2097 ntohs(wlanheader->header.size), ntohs(temp_hdr->size),
2098 sizeof(struct WlanHeader));
2100 //try if it is a hello message
2101 if (ntohs(wlanheader->header.size) >= ntohs(temp_hdr->size)
2102 + sizeof(struct WlanHeader))
2104 if (ntohs(temp_hdr->type) == GNUNET_MESSAGE_TYPE_HELLO)
2106 if (GNUNET_HELLO_get_id(
2107 (const struct GNUNET_HELLO_Message *) temp_hdr,
2108 &tmptarget) == GNUNET_OK)
2110 session = create_session(plugin, &session_light->addr);
2111 session_light->session = session;
2112 memcpy(&session->target, &tmptarget,
2113 sizeof(struct GNUNET_PeerIdentity));
2117 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
2118 "WLAN client not in session list and hello message not okay\n");
2125 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
2126 "WLAN client not in session list and not a hello message\n");
2133 GNUNET_ERROR_TYPE_WARNING,
2134 "WLAN client not in session list and message size in does not fit\npacket size = %u, inner size = %u, header size = %u\n",
2135 ntohs(wlanheader->header.size), ntohs(temp_hdr->size),
2136 sizeof(struct WlanHeader));
2141 //"receive" the message
2144 GNUNET_SERVER_mst_receive(plugin->data_tokenizer, session,
2145 (const char *) temp_hdr,
2146 ntohs(hdr->size) - sizeof(struct WlanHeader), GNUNET_YES, GNUNET_NO);
2152 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
2153 "wlan_data_massage_handler got wrong message type\n");
2161 * Function to check if all fragments of a message have been received
2162 * @param plugin the plugin handle
2163 * @param session_light information of the message sender
2164 * @param session session the message belongs to
2165 * @param rec_message pointer to the message that should be checked
2169 check_rec_finished_msg(struct Plugin* plugin,
2170 struct Session_light * session_light, struct Session * session,
2171 struct Receive_Message_Queue * rx_message)
2173 GNUNET_assert(rx_message !=NULL);
2175 struct Receive_Fragment_Queue * rx_frag = rx_message->frag_head;
2176 int packetsize = rx_message->rec_size;
2179 uint64_t bitfield = 0;
2182 //check if first fragment is present
2183 if (packetsize == MESSAGE_LENGHT_UNKNOWN)
2187 // test if message has at least the size of the WlanHeader and a GNUNET_MessageHeader
2188 else if (packetsize < sizeof(struct WlanHeader)
2189 + sizeof(struct GNUNET_MessageHeader))
2192 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Message not big enough\n");
2194 free_receive_message(plugin, rx_message);
2199 check_message_fragment_bitfield(rx_message);
2202 // if (rx_message->frag_tail->num == ffsl(rx_message->received_fragments))
2204 bitfield = ~bitfield;
2205 bitfield = bitfield >> (63 - rx_message->frag_tail->num);
2206 if (rx_message->received_fragments == bitfield)
2209 while (rx_frag != NULL)
2211 sum += rx_frag->size;
2212 rx_frag = rx_frag->next;
2214 //sum should always be smaller or equal of
2215 GNUNET_assert(sum <= packetsize);
2216 if (sum == packetsize)
2220 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2221 "check_rec_finished_msg: A message for %p is complete\n", session);
2225 //copy fragments together
2226 msg = GNUNET_malloc(packetsize);
2227 rx_frag = rx_message->frag_head;
2229 while (rx_frag != NULL)
2231 //TODO SAVE SOME COPY OPS AND CHECK CRC WITHOUT COPY
2232 memcpy(msg + aktnum, rx_frag->msg, rx_frag->size);
2233 aktnum += rx_frag->size;
2234 rx_frag = rx_frag->next;
2237 free_receive_message(plugin, rx_message);
2238 //call wlan_process_helper to process the message
2239 wlan_data_massage_handler(plugin, session_light,
2240 (struct GNUNET_MessageHeader*) msg);
2241 //wlan_data_helper (plugin, session_light, (struct GNUNET_MessageHeader*) msg);
2250 process_data(void *cls, void *client, const struct GNUNET_MessageHeader *hdr)
2253 GNUNET_assert(client != NULL);
2254 GNUNET_assert(cls != NULL);
2255 struct Session * session = (struct Session *) client;
2256 struct Plugin * plugin = (struct Plugin *) cls;
2258 struct GNUNET_TRANSPORT_ATS_Information distance[2];
2259 distance[0].type = htonl(GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
2260 distance[0].value = htonl(1);
2261 distance[1].type = htonl(GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
2262 distance[1].value = htonl(0);
2265 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2266 "Calling plugin->env->receive for session %p; %s; size: %u\n", session,
2267 wlan_plugin_address_to_string(NULL, session->addr, 6), htons(hdr->size));
2270 plugin->env->receive(plugin->env->cls, &(session->target), hdr,
2271 (const struct GNUNET_TRANSPORT_ATS_Information *) &distance, 2, session,
2272 (const char*) &session->addr, sizeof(session->addr));
2276 * function to add an ack to send it for a received fragment
2277 * @param plugin pointer to the global plugin structure
2278 * @param session pointer to the session this ack belongs to
2279 * @param bitfield bitfield to send
2280 * @param fh pointer to the fragmentation header which we would like to acknolage
2284 add_ack_for_send(struct Plugin * plugin, struct Session * session,
2285 uint64_t bitfield, struct FragmentationHeader * fh)
2287 struct AckSendQueue * ack;
2289 GNUNET_assert(plugin != NULL);
2290 GNUNET_assert(session != NULL);
2291 GNUNET_assert(fh != NULL);
2293 ack = GNUNET_malloc(sizeof(struct AckSendQueue));
2294 ack->fragments_field = bitfield;
2295 ack->message_id = ntohl(fh->message_id);
2296 ack->session = session;
2298 GNUNET_CONTAINER_DLL_insert_tail(plugin->ack_send_queue_head,
2299 plugin->ack_send_queue_tail, ack);
2304 * function to get the receive message from the message id and the session
2305 * @param plugin pointer to the plugin struct
2306 * @param session session this fragment belongs to
2307 * @param message_id id of the message
2310 struct Receive_Message_Queue *
2311 get_receive_message(struct Plugin * plugin, struct Session * session,
2312 uint32_t message_id)
2314 struct Receive_Message_Queue * rec_message = plugin->receive_messages_head;
2315 while (rec_message != NULL)
2317 if ((rec_message->message_id_in == message_id) && (rec_message->session
2322 rec_message = rec_message->next;
2330 * function to insert a received fragment into the right fragment queue of the right message
2331 * @param plugin pointer to the plugin struct
2332 * @param session_light pointer to the session_light struct of this message
2333 * @param session session this fragment belongs to
2334 * @param fh pointer to the header of the fragment
2335 * @return new fragment bitfield for the message
2339 insert_fragment_in_in_message_queue(struct Plugin * plugin,
2340 struct Session_light * session_light, struct Session * session,
2341 struct FragmentationHeader * fh, const struct Radiotap_rx * rxinfo)
2343 struct Receive_Fragment_Queue * rx_frag = NULL;
2344 struct Receive_Message_Queue * rx_message;
2345 const char * tempmsg = (char*) &fh[1];
2346 uint64_t retval = 0;
2348 //TODO fragments do not timeout
2349 //check if message_id is right or it is a new msg
2350 GNUNET_assert(fh != NULL);
2352 rx_message = get_receive_message(plugin, session, ntohl(fh->message_id));
2354 if (rx_message == NULL)
2356 if (session->fragment_messages_in_count < MESSAGES_IN_QUEUE_PER_SESSION)
2359 //new message incoming
2360 rx_message = GNUNET_malloc(sizeof (struct Receive_Message_Queue));
2361 rx_message->message_id_in = ntohl(fh->message_id);
2362 rx_message->rec_size = MESSAGE_LENGHT_UNKNOWN;
2363 rx_message->session = session;
2364 rx_message->timeout = GNUNET_TIME_absolute_add(
2365 GNUNET_TIME_absolute_get(), MESSAGE_IN_TIMEOUT);
2366 rx_message->received_fragments = 0;
2368 GNUNET_CONTAINER_DLL_insert(plugin->receive_messages_head, plugin->receive_messages_teil, rx_message);
2370 session->fragment_messages_in_count++;
2371 plugin->pending_receive_messages++;
2375 GNUNET_ERROR_TYPE_DEBUG,
2376 "New fragmented message started: message id %u, messages in for this session %u, messages in %u\n",
2377 rx_message->message_id_in, session->fragment_messages_in_count,
2378 plugin->pending_receive_messages);
2385 GNUNET_ERROR_TYPE_INFO,
2386 "WLAN fragment message_id and session message_id do not exist, max MESSAGES_IN_QUEUE_PER_SESSION reached\n");
2387 setBit((char *) &retval, ntohs(fh->fragment_off_or_num));
2392 if (is_double_msg(rx_message, fh) != GNUNET_YES)
2397 rx_frag = GNUNET_malloc(sizeof (struct Receive_Fragment_Queue) +
2398 ntohs(fh->header.size) - sizeof(struct FragmentationHeader));
2399 rx_frag->size = ntohs(fh->header.size)
2400 - sizeof(struct FragmentationHeader);
2401 rx_frag->num = ntohs(fh->fragment_off_or_num);
2402 rx_frag->msg = (char*) &(rx_frag[1]);
2403 //copy msg to buffer
2404 memcpy((char *) rx_frag->msg, tempmsg, rx_frag->size);
2405 memcpy((char *) &(rx_frag->rxinfo), rxinfo, sizeof(rxinfo));
2406 insert_fragment_in_queue(rx_message, rx_frag);
2408 retval = rx_message->received_fragments;
2412 GNUNET_ERROR_TYPE_DEBUG,
2413 "New fragment: size %u, fragsize %u, message id %u, bitfield %X, session %u\n",
2414 rx_message->rec_size, rx_frag->size, rx_message->message_id_in,
2415 rx_message->received_fragments, session);
2418 check_rec_finished_msg(plugin, session_light, session, rx_message);
2422 GNUNET_log(GNUNET_ERROR_TYPE_INFO, "WLAN fragment is a clone\n");
2423 retval = rx_message->received_fragments;
2431 * Function used for to process the data received from the wlan interface
2433 * @param cls the plugin handle
2434 * @param session_light FIXME: document
2435 * @param hdr hdr of the GNUNET_MessageHeader
2438 wlan_data_helper(void *cls, struct Session_light * session_light,
2439 const struct GNUNET_MessageHeader * hdr, const struct Radiotap_rx * rxinfo)
2441 struct Plugin *plugin = cls;
2442 struct Session * session = NULL;
2444 struct FragmentationHeader * fh = NULL;
2445 struct FragmentationAckHeader * fah = NULL;
2446 struct FragmentMessage * fm = NULL;
2448 const char * tempmsg = NULL;
2450 uint64_t fragment_bitfield = 0;
2453 if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_ADVERTISEMENT)
2456 //TODO better DOS protection, error handling
2457 //TODO test first than create session
2458 GNUNET_assert(session_light != NULL);
2462 GNUNET_ERROR_TYPE_DEBUG,
2463 "Func wlan_data_helper got GNUNET_MESSAGE_TYPE_WLAN_ADVERTISEMENT size: %u; %s\n",
2464 ntohs(hdr->size), wlan_plugin_address_to_string(NULL,
2465 session_light->addr, 6));
2468 if (session_light->session == NULL)
2470 session_light->session = get_Session(plugin, &session_light->addr);
2472 GNUNET_assert(GNUNET_HELLO_get_id(
2473 (const struct GNUNET_HELLO_Message *) &hdr[1],
2474 &(session_light->session->target) ) != GNUNET_SYSERR);
2479 else if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT)
2482 GNUNET_assert(session_light != NULL);
2483 if (session_light->session == NULL)
2485 session_light->session = search_session(plugin, &session_light->addr);
2487 session = session_light->session;
2489 fh = (struct FragmentationHeader *) hdr;
2490 tempmsg = (char*) &fh[1];
2494 GNUNET_ERROR_TYPE_DEBUG,
2495 "Func wlan_data_helper got GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT with message_id %u with fragment number %i, size: %u; %s\n",
2496 ntohl(fh->message_id), ntohs(fh->fragment_off_or_num), ntohs(
2497 hdr->size), wlan_plugin_address_to_string(NULL,
2498 session_light->addr, 6));
2501 if (getcrc16(tempmsg, ntohs(fh->header.size)) != ntohs(fh->message_crc))
2503 //wrong crc, dispose message
2504 GNUNET_log(GNUNET_ERROR_TYPE_INFO, "WLAN fragment crc was wrong\n");
2508 //if in the session list
2509 if (session != NULL)
2511 fragment_bitfield = insert_fragment_in_in_message_queue(plugin,
2512 session_light, session, fh, rxinfo);
2518 GNUNET_ERROR_TYPE_INFO,
2519 "WLAN client not in session list, fragment num %u, message id %u\n",
2520 ntohs(fh->fragment_off_or_num), ntohl(fh->message_id));
2521 wlan_data_massage_handler(plugin, session_light,
2522 (struct GNUNET_MessageHeader *) tempmsg);
2523 session = session_light->session;
2524 //test if a session was created
2525 if (session == NULL)
2529 setBit((char *) &fragment_bitfield, ntohs(fh->fragment_off_or_num));
2532 add_ack_for_send(plugin, session, fragment_bitfield, fh);
2533 check_next_fragment_timeout(plugin);
2538 else if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT_ACK)
2543 GNUNET_ERROR_TYPE_DEBUG,
2544 "Func wlan_data_helper got GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT_ACK size: %u; %s\n",
2545 ntohs(hdr->size), wlan_plugin_address_to_string(NULL,
2546 session_light->addr, 6));
2549 GNUNET_assert(session_light != NULL);
2550 if (session_light->session == NULL)
2552 session_light->session = search_session(plugin, &session_light->addr);
2553 GNUNET_assert(session_light->session != NULL);
2555 session = session_light->session;
2556 fah = (struct FragmentationAckHeader *) hdr;
2557 fm = get_fragment_message_from_session_and_id(session, ntohl(
2562 fm->ack_bitfield = fm->ack_bitfield | GNUNET_ntohll(fah->fragment_field);
2563 check_finished_fragment(plugin, fm);
2567 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
2568 "WLAN fragment not in fragment list with id %u of ack\n", ntohl(
2578 GNUNET_ERROR_TYPE_INFO,
2579 "WLAN packet inside the WLAN helper packet has not the right type: %u size: %u\n",
2580 ntohs(hdr->type), ntohs(hdr->size));
2586 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2587 "Helper finished\n");
2593 macprinter(const u_int8_t * mac)
2595 static char macstr[20];
2597 GNUNET_snprintf(macstr, sizeof(macstr), "%X:%X:%X:%X:%X:%X", mac[0], mac[1],
2598 mac[2], mac[3], mac[4], mac[5]);
2603 * Function used for to process the data from the suid process
2605 * @param cls the plugin handle
2606 * @param client client that send the data (not used)
2607 * @param hdr header of the GNUNET_MessageHeader
2610 wlan_process_helper(void *cls, void *client,
2611 const struct GNUNET_MessageHeader *hdr)
2613 struct Plugin *plugin = cls;
2614 struct ieee80211_frame * wlanIeeeHeader = NULL;
2615 struct Session_light * session_light = NULL;
2616 struct Radiotap_rx * rxinfo;
2617 const struct GNUNET_MessageHeader * temp_hdr = NULL;
2622 switch (ntohs(hdr->type))
2624 case GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA:
2627 GNUNET_ERROR_TYPE_DEBUG,
2628 "Func wlan_process_helper got GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA size: %u\n",
2632 //call wlan_process_helper with the message inside, later with wlan: analyze signal
2633 if (ntohs(hdr->size) < sizeof(struct ieee80211_frame)
2634 + sizeof(struct GNUNET_MessageHeader) + sizeof(struct Radiotap_rx))
2637 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2638 "Size of packet is too small; size: %u min size: %u\n", ntohs(
2639 hdr->size), sizeof(struct ieee80211_frame)
2640 + sizeof(struct GNUNET_MessageHeader));
2643 /* FIXME: restart SUID process */
2646 rxinfo = (struct Radiotap_rx *) &hdr[1];
2647 wlanIeeeHeader = (struct ieee80211_frame *) &rxinfo[1];
2649 //process only if it is an broadcast or for this computer both with the gnunet bssid
2652 if (memcmp(&(wlanIeeeHeader->i_addr3), &mac_bssid, sizeof(struct MacAddress))
2655 //check for broadcast or mac
2656 if (memcmp(&(wlanIeeeHeader->i_addr1), &bc_all_mac,
2657 sizeof(struct MacAddress) == 0) || memcmp(
2658 &(wlanIeeeHeader->i_addr1), &(plugin->mac_address),
2659 sizeof(struct MacAddress)) == 0)
2662 // process the inner data
2665 datasize = ntohs(hdr->size) - sizeof(struct ieee80211_frame)
2666 - sizeof(struct GNUNET_MessageHeader)
2667 - sizeof(struct Radiotap_rx);
2669 session_light = GNUNET_malloc(sizeof(struct Session_light));
2670 memcpy(&session_light->addr, &(wlanIeeeHeader->i_addr2),
2671 sizeof(struct MacAddress));
2672 //session_light->session = search_session(plugin,session_light->addr);
2675 temp_hdr = (struct GNUNET_MessageHeader *) &wlanIeeeHeader[1];
2676 while (pos < datasize)
2678 temp_hdr = (struct GNUNET_MessageHeader *) &wlanIeeeHeader[1]
2681 wlan_data_helper(plugin, session_light, temp_hdr, rxinfo);
2682 pos += ntohs(temp_hdr->size);
2687 GNUNET_free(session_light);
2692 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2693 "Func wlan_process_helper got wrong MAC: %s\n", macprinter(
2694 wlanIeeeHeader->i_addr1));
2701 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2702 "Func wlan_process_helper got wrong BSSID: %s\n", macprinter(
2703 wlanIeeeHeader->i_addr2));
2707 case GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL:
2708 //TODO more control messages
2709 //TODO use struct wlan_helper_control
2710 if (ntohs(hdr->size) != sizeof(struct Wlan_Helper_Control_Message))
2713 /* FIXME: restart SUID process */
2716 memcpy(&plugin->mac_address, &hdr[1], sizeof(struct MacAddress));
2718 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2719 "Received WLAN_HELPER_CONTROL message with transport of address %s\n",
2720 wlan_plugin_address_to_string(cls, &plugin->mac_address,
2721 sizeof(struct MacAddress)));
2723 plugin->env->notify_address(plugin->env->cls, "wlan", &plugin->mac_address,
2724 sizeof(struct MacAddress), GNUNET_TIME_UNIT_FOREVER_REL);
2733 * We have been notified that wlan-helper has written something to stdout.
2734 * Handle the output, then reschedule this function to be called again once
2735 * more is available.
2737 * @param cls the plugin handle
2738 * @param tc the scheduling context
2741 wlan_plugin_helper_read(void *cls,
2742 const struct GNUNET_SCHEDULER_TaskContext *tc)
2744 struct Plugin *plugin = cls;
2745 plugin->server_read_task = GNUNET_SCHEDULER_NO_TASK;
2749 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2750 "Start reading from STDIN\n");
2753 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
2756 char mybuf[WLAN_MTU + sizeof(struct GNUNET_MessageHeader)];
2759 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, mybuf,
2764 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2765 _("Finished reading from wlan-helper stdout with code: %d\n"),
2770 GNUNET_SERVER_mst_receive(plugin->suid_tokenizer, NULL, mybuf, bytes,
2771 GNUNET_NO, GNUNET_NO);
2773 GNUNET_assert(plugin->server_read_task == GNUNET_SCHEDULER_NO_TASK);
2774 plugin->server_read_task = GNUNET_SCHEDULER_add_read_file(
2775 GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdout_handle,
2776 &wlan_plugin_helper_read, plugin);
2780 * Start the gnunet-wlan-helper process.
2782 * @param plugin the transport plugin
2783 * @param testmode should we use the dummy driver for testing?
2784 * @return GNUNET_YES if process was started, GNUNET_SYSERR on error
2787 wlan_transport_start_wlan_helper(struct Plugin *plugin, int testmode)
2789 const char * filename = "gnunet-transport-wlan-helper";
2790 plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES, GNUNET_NO, GNUNET_YES);
2791 if (plugin->server_stdout == NULL)
2792 return GNUNET_SYSERR;
2794 plugin->server_stdin = GNUNET_DISK_pipe(GNUNET_YES, GNUNET_YES, GNUNET_NO);
2795 if (plugin->server_stdin == NULL)
2796 return GNUNET_SYSERR;
2799 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2800 "Starting gnunet-wlan-helper process cmd: %s %s %i\n", filename,
2801 plugin->interface, testmode);
2803 /* Start the server process */
2805 plugin->server_proc = GNUNET_OS_start_process(plugin->server_stdin,
2806 plugin->server_stdout, filename, filename, plugin->interface, ((testmode
2807 == 1) ? "1" : (testmode == 2) ? "2" : "0"), NULL);
2808 if (plugin->server_proc == NULL)
2811 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2812 "Failed to start gnunet-wlan-helper process\n");
2814 return GNUNET_SYSERR;
2817 /* Close the write end of the read pipe */
2818 GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
2820 /* Close the read end of the write pipe */
2821 GNUNET_DISK_pipe_close_end(plugin->server_stdin, GNUNET_DISK_PIPE_END_READ);
2823 plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout,
2824 GNUNET_DISK_PIPE_END_READ);
2825 plugin->server_stdin_handle = GNUNET_DISK_pipe_handle(plugin->server_stdin,
2826 GNUNET_DISK_PIPE_END_WRITE);
2828 GNUNET_assert(plugin->server_read_task == GNUNET_SCHEDULER_NO_TASK);
2831 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2832 "Adding server_read_task for the wlan-helper\n");
2837 plugin->server_read_task = GNUNET_SCHEDULER_add_read_file(
2838 GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdout_handle,
2839 &wlan_plugin_helper_read, plugin);
2845 * Exit point from the plugin.
2846 * @param cls pointer to the api struct
2851 libgnunet_plugin_transport_wlan_done(void *cls)
2853 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2854 struct Plugin *plugin = api->cls;
2857 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2858 "libgnunet_plugin_transport_wlan_done started\n");
2861 GNUNET_assert(cls !=NULL);
2863 if (plugin->suid_tokenizer != NULL)
2864 GNUNET_SERVER_mst_destroy(plugin->suid_tokenizer);
2866 if (plugin->data_tokenizer != NULL)
2867 GNUNET_SERVER_mst_destroy(plugin->data_tokenizer);
2869 GNUNET_free_non_null(plugin->interface);
2870 GNUNET_free (plugin);
2876 * Entry point for the plugin.
2878 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
2879 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
2882 libgnunet_plugin_transport_wlan_init(void *cls)
2884 //struct GNUNET_SERVICE_Context *service;
2885 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2886 struct GNUNET_TRANSPORT_PluginFunctions *api;
2887 struct Plugin *plugin;
2888 static unsigned long long testmode = 0;
2890 GNUNET_assert(cls !=NULL);
2892 plugin = GNUNET_malloc (sizeof (struct Plugin));
2894 plugin->pendingsessions = 0;
2895 plugin->session_count = 0;
2896 plugin->server_write_task = GNUNET_SCHEDULER_NO_TASK;
2897 plugin->server_read_task = GNUNET_SCHEDULER_NO_TASK;
2898 plugin->server_write_delay_task = GNUNET_SCHEDULER_NO_TASK;
2900 plugin->suid_tokenizer = GNUNET_SERVER_mst_create(&wlan_process_helper,
2903 plugin->data_tokenizer = GNUNET_SERVER_mst_create(&process_data, plugin);
2905 //plugin->sessions = GNUNET_malloc (sizeof (struct Sessionqueue));
2906 //plugin->pending_Sessions = GNUNET_malloc (sizeof (struct Sessionqueue));
2908 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2910 api->send = &wlan_plugin_send;
2911 api->disconnect = &wlan_plugin_disconnect;
2912 api->address_pretty_printer = &wlan_plugin_address_pretty_printer;
2913 api->check_address = &wlan_plugin_address_suggested;
2914 api->address_to_string = &wlan_plugin_address_to_string;
2918 if (GNUNET_CONFIGURATION_have_value(env->cfg, "transport-wlan", "TESTMODE"))
2920 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number(env->cfg,
2921 "transport-wlan", "TESTMODE", &testmode))
2922 testmode = 0; //default value
2925 if (GNUNET_CONFIGURATION_have_value(env->cfg, "transport-wlan", "INTERFACE"))
2927 if (GNUNET_CONFIGURATION_get_value_string(env->cfg, "transport-wlan",
2928 "INTERFACE", &(plugin->interface)) != GNUNET_YES)
2930 libgnunet_plugin_transport_wlan_done(api);
2936 set_next_beacon_time(plugin);
2938 wlan_transport_start_wlan_helper(plugin, testmode);
2941 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "wlan init finished\n");
2947 /* end of plugin_transport_wlan.c */