/*
- This file is part of GNUnet
- (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
-
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
-
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
-*/
+ This file is part of GNUnet
+ (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+ */
/**
* @file transport/plugin_transport_wlan.c
- * @brief template for a new transport service
- * @author Christian Grothoff
+ * @brief transport plugin for wlan
+ * @author David Brodski
*/
#include "platform.h"
+#include "gnunet_hello_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_util_lib.h"
#include "gnunet_statistics_service.h"
#include "gnunet_transport_service.h"
-#include "plugin_transport.h"
+#include "gnunet_transport_plugin.h"
+#include "plugin_transport_wlan.h"
+#include "gnunet_common.h"
+#include "gnunet_crypto_lib.h"
+#include "wlan/ieee80211.h"
+
+#include <string.h>
#define PROTOCOL_PREFIX "wlan"
+/**
+ * Max size of packet from helper
+ */
+#define WLAN_MTU 3000
+
+/**
+ * Time until retransmission of a fragment in ms
+ */
+#define FRAGMENT_TIMEOUT GNUNET_TIME_UNIT_SECONDS
+
+#define FRAGMENT_QUEUE_SIZE 10
+#define FRAGMENT_QUEUE_MESSAGES_OUT_PER_SESSION 1
+
+#define MESSAGE_IN_TIMEOUT GNUNET_TIME_UNIT_SECONDS
+
+#define MESSAGES_IN_QUEUE_SIZE 10
+#define MESSAGES_IN_QUEUE_PER_SESSION 1
+
+#define HALLO_BEACON_SCALING_FACTOR 900
+
#define DEBUG_wlan GNUNET_NO
+#define DEBUG_wlan_retransmission GNUNET_NO
+
+#define MESSAGE_LENGHT_UNKNOWN -1
+//#define NO_MESSAGE_OR_MESSAGE_FINISHED -2
/**
* After how long do we expire an address that we
*/
#define LEARNED_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 6)
-
/**
- * Encapsulation of all of the state of the plugin.
+ * Initial handshake message for a session.
*/
-struct Plugin;
+struct WelcomeMessage
+{
+ /**
+ * Type is GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Identit*mac_y of the node connecting (TCP client)
+ */
+ struct GNUNET_PeerIdentity clientIdentity;
+};
/**
- * Session handle for connections.
+ * Encapsulation of all of the state of the plugin.
*/
-struct Session
+struct Plugin
{
+ /**
+ * Our environment.
+ */
+ struct GNUNET_TRANSPORT_PluginEnvironment *env;
/**
- * Stored in a linked list.
+ * List of open sessions. head
*/
- struct Session *next;
+ struct Sessionqueue *sessions;
/**
- * Pointer to the global plugin struct.
+ * List of open sessions. tail
*/
- struct Plugin *plugin;
+ struct Sessionqueue *sessions_tail;
/**
- * The client (used to identify this connection)
+ * Number of sessions
*/
- /* void *client; */
+ unsigned int session_count;
/**
- * Continuation function to call once the transmission buffer
- * has again space available. NULL if there is no
- * continuation to call.
+ * encapsulation of data from the local wlan helper program
*/
- GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
+ struct GNUNET_SERVER_MessageStreamTokenizer * suid_tokenizer;
/**
- * Closure for transmit_cont.
+ * encapsulation of packets received from the wlan helper
+ */
+ struct GNUNET_SERVER_MessageStreamTokenizer * data_tokenizer;
+ /**
+ * encapsulation of packets received
*/
- void *transmit_cont_cls;
+ struct GNUNET_SERVER_MessageStreamTokenizer * fragment_tokenizer;
/**
- * To whom are we talking to (set to our identity
- * if we are still waiting for the welcome message)
+ * stdout pipe handle for the gnunet-wlan-helper process
+ */
+ struct GNUNET_DISK_PipeHandle *server_stdout;
+
+ /**
+ * stdout file handle for the gnunet-wlan-helper process
*/
- struct GNUNET_PeerIdentity sender;
+ const struct GNUNET_DISK_FileHandle *server_stdout_handle;
/**
- * At what time did we reset last_received last?
+ * stdin pipe handle for the gnunet-wlan-helper process
*/
- struct GNUNET_TIME_Absolute last_quota_update;
+ struct GNUNET_DISK_PipeHandle *server_stdin;
/**
- * How many bytes have we received since the "last_quota_update"
- * timestamp?
+ * stdin file handle for the gnunet-wlan-helper process
*/
- uint64_t last_received;
+ const struct GNUNET_DISK_FileHandle *server_stdin_handle;
/**
- * Number of bytes per ms that this peer is allowed
- * to send to us.
+ * ID of the gnunet-wlan-server std read task
*/
- uint32_t quota;
+ GNUNET_SCHEDULER_TaskIdentifier server_read_task;
-};
+ /**
+ * ID of the gnunet-wlan-server std read task
+ */
+ GNUNET_SCHEDULER_TaskIdentifier server_write_task;
-/**
- * Encapsulation of all of the state of the plugin.
- */
-struct Plugin
-{
/**
- * Our environment.
+ * ID of the delay task for writing
*/
- struct GNUNET_TRANSPORT_PluginEnvironment *env;
+ GNUNET_SCHEDULER_TaskIdentifier server_write_delay_task;
/**
- * List of open sessions.
- * TODO?
+ * The process id of the wlan process
*/
- struct Session *sessions;
+ struct GNUNET_OS_Process *server_proc;
/**
- * encapsulation to the local wlan server prog
+ * The interface of the wlan card given to us by the user.
*/
+ char *interface;
- struct GNUNET_SERVER_MessageStreamTokenizer * consoltoken;
+ /**
+ * The mac_address of the wlan card given to us by the helper.
+ */
+ struct MacAddress mac_address;
/**
- * encapsulation of the data
+ * Sessions currently pending for transmission
+ * to this peer, if any.
*/
+ struct Sessionqueue * pending_Sessions_head;
- struct GNUNET_SERVER_MessageStreamTokenizer * datatoken;
+ /**
+ * Sessions currently pending for transmission
+ * to this peer (tail), if any.
+ */
+ struct Sessionqueue * pending_Sessions_tail;
/**
- * stdout pipe handle for the gnunet-wlan-helper process
+ * number of pending sessions
*/
- struct GNUNET_DISK_PipeHandle *server_stdout;
+ unsigned int pendingsessions;
/**
- * stdout file handle for the gnunet-wlan-helper process
+ * Messages in the fragmentation queue, head
*/
- const struct GNUNET_DISK_FileHandle *server_stdout_handle;
+ struct GNUNET_CONTAINER_Heap * pending_Fragment_Messages;
/**
- * stdin pipe handle for the gnunet-wlan-helper process
+ * Messages in the in Queue, head
*/
- struct GNUNET_DISK_PipeHandle *server_stdin;
+ struct Receive_Message_Queue * receive_messages_head;
/**
- * stdin file handle for the gnunet-wlan-helper process
+ * Messages in the in Queue, tail
*/
- const struct GNUNET_DISK_FileHandle *server_stdin_handle;
+ struct Receive_Message_Queue * receive_messages_teil;
/**
- * ID of select gnunet-nat-server std read task
+ * number of messages in the in queue
*/
- GNUNET_SCHEDULER_TaskIdentifier server_read_task;
+ unsigned int pending_receive_messages;
/**
- * The process id of the server process (if behind NAT)
+ * time of the next "hello-beacon"
*/
- pid_t server_pid;
+ struct GNUNET_TIME_Absolute beacon_time;
/**
- * The interface of the wlan card given to us by the user.
+ * queue to send acks for received fragments (head)
*/
- char *interface;
+ struct AckSendQueue * ack_send_queue_head;
/**
- * The mac_address of the wlan card given to us by the helper.
+ * queue to send acks for received fragments (tail)
*/
- char *mac_address;
+ struct AckSendQueue * ack_send_queue_tail;
};
-struct Plugin* plugin;
-
/**
- * Function that can be used by the transport service to transmit
- * a message using the plugin.
- *
- * @param cls closure
- * @param target who should receive this message
- * @param priority how important is the message
- * @param msgbuf the message to transmit
- * @param msgbuf_size number of bytes in 'msgbuf'
- * @param timeout when should we time out
- * @param session which session must be used (or NULL for "any")
- * @param addr the address to use (can be NULL if the plugin
- * is "on its own" (i.e. re-use existing TCP connection))
- * @param addrlen length of the address in bytes
- * @param force_address GNUNET_YES if the plugin MUST use the given address,
- * otherwise the plugin may use other addresses or
- * existing connections (if available)
- * @param cont continuation to call once the message has
- * been transmitted (or if the transport is ready
- * for the next transmission call; or if the
- * peer disconnected...)
- * @param cont_cls closure for cont
- * @return number of bytes used (on the physical network, with overheads);
- * -1 on hard errors (i.e. address invalid); 0 is a legal value
- * and does NOT mean that the message was not transmitted (DV)
+ * Struct to store data if file write did not accept the whole packet
*/
-static ssize_t
-wlan_plugin_send (void *cls,
- const struct GNUNET_PeerIdentity *
- target,
- const char *msgbuf,
- size_t msgbuf_size,
- unsigned int priority,
- struct GNUNET_TIME_Relative timeout,
- struct Session *session,
- const void *addr,
- size_t addrlen,
- int force_address,
- GNUNET_TRANSPORT_TransmitContinuation
- cont, void *cont_cls)
+struct Finish_send
{
- int bytes_sent = 0;
- /* struct Plugin *plugin = cls; */
- return bytes_sent;
-}
-
-
+ struct Plugin * plugin;
+ char * msgheader;
+ struct GNUNET_MessageHeader * msgstart;
+ ssize_t size;
+ struct GNUNET_TIME_Absolute next_send;
+};
/**
- * Function that can be used to force the plugin to disconnect
- * from the given peer and cancel all previous transmissions
- * (and their continuationc).
- *
- * @param cls closure
- * @param target peer from which to disconnect
+ * Queue of sessions, for the general session queue and the pending session queue
*/
-static void
-wlan_plugin_disconnect (void *cls,
- const struct GNUNET_PeerIdentity *target)
+//TODO DOXIGEN
+struct Sessionqueue
{
- // struct Plugin *plugin = cls;
- // FIXME
-}
-
+ struct Sessionqueue * next;
+ struct Sessionqueue * prev;
+ struct Session * content;
+};
/**
- * Convert the transports address to a nice, human-readable
- * format.
- *
- * @param cls closure
- * @param type name of the transport that generated the address
- * @param addr one of the addresses of the host, NULL for the last address
- * the specific address format depends on the transport
- * @param addrlen length of the address
- * @param numeric should (IP) addresses be displayed in numeric form?
- * @param timeout after how long should we give up?
- * @param asc function to call on each string
- * @param asc_cls closure for asc
+ * Queue for the fragments received
*/
-static void
-wlan_plugin_address_pretty_printer (void *cls,
- const char *type,
- const void *addr,
- size_t addrlen,
- int numeric,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_AddressStringCallback
- asc, void *asc_cls)
+//TODO DOXIGEN
+struct Receive_Fragment_Queue
{
- char ret[92];
- const unsigned char * input;
-
- GNUNET_assert(cls !=NULL);
- if (addrlen != 6)
- {
- /* invalid address (MAC addresses have 6 bytes) */
- GNUNET_break (0);
- asc (asc_cls, NULL);
- return;
- }
- input = (const unsigned char*) addr;
- GNUNET_snprintf (ret,
- sizeof (ret),
- "%s Mac-Adress %X:%X:%X:%X:%X:%X",
- PROTOCOL_PREFIX,
- input[0], input[1], input[2], input[3], input[4], input[5]);
- asc (asc_cls, ret);
-}
+ struct Receive_Fragment_Queue * next;
+ struct Receive_Fragment_Queue * prev;
+ uint16_t num;
+ const char * msg;
+ uint16_t size;
+ struct Radiotap_rx rxinfo;
+};
+//TODO DOXIGEN
+struct Session_id_fragment_triple
+{
+ struct Session * session;
+ uint32_t message_id;
+ struct FragmentMessage * fm;
+};
+//TODO DOXIGEN
+struct Plugin_Session_pair
+{
+ struct Plugin * plugin;
+ struct Session * session;
+};
/**
- * Another peer has suggested an address for this
- * peer and transport plugin. Check that this could be a valid
- * address. If so, consider adding it to the list
- * of addresses.
- *
- * @param cls closure
- * @param addr pointer to the address
- * @param addrlen length of addr
- * @return GNUNET_OK if this is a plausible address for this peer
- * and transport
+ * Queue for the fragments received
*/
-static int
-wlan_plugin_address_suggested (void *cls,
- const void *addr,
- size_t addrlen)
+struct Receive_Message_Queue
{
- /* struct Plugin *plugin = cls; */
+ struct Receive_Message_Queue * next;
- /* check if the address is plausible; if so,
- add it to our list! */
+ struct Receive_Message_Queue * prev;
- GNUNET_assert(cls !=NULL);
+ /**
+ * current number for message incoming, to distinguish between the messages
+ */
+ uint32_t message_id_in;
- //Mac Adress has 6 bytes
- if (addrlen == 6){
- /* TODO check for bad addresses like milticast, broadcast, etc */
- return GNUNET_OK;
- } else {
- return GNUNET_SYSERR;
- }
+ /**
+ * size of the message received,
+ * MESSAGE_LENGHT_UNKNOWN means that the size is not known,
+ * NO_MESSAGE_OR_MESSAGE_FINISHED means no message received
+ */
+ int rec_size;
-}
+ /**
+ * Sorted queue with the fragments received; head
+ */
+ struct Receive_Fragment_Queue * frag_head;
-/**
- * Function called for a quick conversion of the binary address to
- * a numeric address. Note that the caller must not free the
- * address and that the next call to this function is allowed
- * to override the address again.
- *
- * @param cls closure
- * @param addr binary address
- * @param addrlen length of the address
- * @return string representing the same address
- */
-static const char*
-wlan_plugin_address_to_string (void *cls,
- const void *addr,
- size_t addrlen)
-{
- char ret[92];
- const unsigned char * input;
-
- GNUNET_assert(cls !=NULL);
- if (addrlen != 6)
- {
- /* invalid address (MAC addresses have 6 bytes) */
- GNUNET_break (0);
- return NULL;
- }
- input = (const unsigned char*) addr;
- GNUNET_snprintf (ret,
- sizeof (ret),
- "%s Mac-Adress %X:%X:%X:%X:%X:%X",
- PROTOCOL_PREFIX,
- input[0], input[1], input[2], input[3], input[4], input[5]);
- return GNUNET_strdup (ret);
-}
+ /**
+ * Sorted queue with the fragments received; tail
+ */
+ struct Receive_Fragment_Queue * frag_tail;
-#if 0
-/**
- * Function for used to process the data from the suid process
- */
-static void
-wlan_process_helper (void *cls,
- void *client_identity,
- struct GNUNET_MessageHeader *hdr)
-{
- if (hdr->type == GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA){
- //TODO DATA
- } else if (hdr->type == GNUNET_MESSAGE_TYPE_WLAN_HELPER_ADVERTISEMENT){
- //TODO ADV
- } else if (hdr->type == GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL){
- //TODO Control
- if (hdr->size == 6){
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Notifying transport of address %s\n", wlan_plugin_address_to_string(cls, plugin->mac_address, hdr->size));
- plugin->env->notify_address (plugin->env->cls,
- "wlan",
- &plugin->mac_address, sizeof(plugin->mac_address), GNUNET_TIME_UNIT_FOREVER_REL);
- } else {
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Wrong wlan mac address %s\n", plugin->mac_address);
- }
+ /**
+ * Session this fragment belongs to
+ */
+ struct Session * session;
- } else {
- // TODO Wrong data?
- }
-}
+ /**
+ * Timeout value for the pending message.
+ */
+ struct GNUNET_TIME_Absolute timeout;
+ /**
+ * Bitfield of received fragments
+ */
-static void
-wlan_plugin_helper_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+ uint64_t received_fragments;
+};
+
+/**
+ * Information kept for each message that is yet to
+ * be transmitted.
+ */
+struct PendingMessage
{
- struct Plugin *plugin = cls;
- char mybuf[3000]; //max size of packet from helper
- ssize_t bytes;
- //memset(&mybuf, 0, sizeof(mybuf)); //?
- if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
- return;
+ /**
+ * The pending message
+ */
+ char *msg;
- bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
+ /**
+ * Size of the message
+ */
+ size_t message_size;
- if (bytes < 1)
- {
-#if DEBUG_TCP_NAT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Finished reading from wlan-helper stdout with code: %d\n"), bytes);
-#endif
- return;
- }
+ /**
+ * Continuation function to call once the message
+ * has been sent. Can be NULL if there is no
+ * continuation to call.
+ */
+ GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
- plugin->server_read_task =
- GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
- GNUNET_TIME_UNIT_FOREVER_REL,
- plugin->server_stdout_handle, &wlan_plugin_helper_read, plugin);
+ /**
+ * Cls for transmit_cont
+ */
+ void * transmit_cont_cls;
-}
+ /**
+ * Timeout value for the pending message.
+ */
+ struct GNUNET_TIME_Absolute timeout;
+};
/**
- * Start the gnunet-wlan-helper process for users behind NAT.
- *
- * @param plugin the transport plugin
- *
- * @return GNUNET_YES if process was started, GNUNET_SYSERR on error
+ * Queue for acks to send for fragments recived
*/
-static int
-wlan_transport_start_wlan_helper(struct Plugin *plugin)
+struct AckSendQueue
{
- plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES);
- if (plugin->server_stdout == NULL)
- return GNUNET_SYSERR;
+ /**
+ * next ack in the ack send queue
+ */
+ struct AckSendQueue * next;
+ /**
+ * previous ack in the ack send queue
+ */
+ struct AckSendQueue * prev;
+ /**
+ * pointer to the session this ack belongs to
+ */
+ struct Session * session;
+ /**
+ * ID of message, to distinguish between the messages, picked randomly.
+ */
+ uint32_t message_id;
- plugin->server_stdin = GNUNET_DISK_pipe(GNUNET_YES);
- if (plugin->server_stdin == NULL)
- return GNUNET_SYSERR;
+ /**
+ * Bit field for received fragments
+ */
+ uint64_t fragments_field;
+
+};
+
+/**
+ * Session infos gathered from a messages
+ */
+
+struct Session_light
+{
+ /**
+ * the session this message belongs to
+ */
+ struct Session * session;
+ /**
+ * peer mac address
+ */
+ struct MacAddress addr;
+};
+
+/**
+ * Session handle for connections.
+ */
+struct Session
+{
+
+ /**
+ * API requirement.
+ */
+ struct SessionHeader header;
+
+ /**
+ * Pointer to the global plugin struct.
+ */
+ struct Plugin *plugin;
+
+ /**
+ * Message currently pending for transmission
+ * to this peer, if any.
+ */
+ struct PendingMessage *pending_message;
+
+ /**
+ * Message currently pending for transmission
+ * to this peer, if any.
+ */
+ struct PendingMessage *pending_message2;
+
+ /**
+ * To whom are we talking to (set to our identity
+ * if we are still waiting for the welcome message)
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /**
+ * peer mac address
+ */
+ struct MacAddress addr;
+
+ /**
+ * Address of the other peer (either based on our 'connect'
+ * call or on our 'accept' call).
+ */
+ void *connect_addr;
+
+ /**
+ * Last activity on this connection. Used to select preferred
+ * connection.
+ */
+ struct GNUNET_TIME_Absolute last_activity;
+
+ /**
+ * count of messages in the fragment out queue for this session
+ */
+
+ int fragment_messages_out_count;
+
+ /**
+ * count of messages in the fragment in queue for this session
+ */
+
+ int fragment_messages_in_count;
+
+ //TODO DOXIGEN
+ uint8_t rate;
+ uint16_t tx_power;
+ uint8_t antenna;
+
+};
+
+/**
+ * Struct for Messages in the fragment queue
+ */
+
+struct FragmentMessage
+{
+ /**
+ * heap pointer of this message
+ */
+ struct GNUNET_CONTAINER_HeapNode * node;
+
+ /**
+ * Session this message belongs to
+ */
+
+ struct Session *session;
+
+ /**
+ * This is a doubly-linked list.
+ */
+ struct FragmentMessage *next;
+
+ /**
+ * This is a doubly-linked list.
+ */
+ struct FragmentMessage *prev;
+
+ /**
+ * The pending message
+ */
+ char *msg;
+
+ /**
+ * 0 if not in ack queue
+ * 1 if in ack queue
+ */
+
+ char in_ack_queue;
+
+ /**
+ * Timeout value for the pending message.
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+ /**
+ * Timeout value for the pending fragments.
+ * Stores the time when the next msg fragment ack has to be received
+ */
+ struct GNUNET_TIME_Absolute next_ack;
+
+ /**
+ * bitfield with all acks received for this message
+ */
+ uint64_t ack_bitfield;
+
+ /**
+ * Size of the message
+ */
+ size_t message_size;
+
+ /**
+ * pos / next fragment number in the message, for fragmentation/segmentation,
+ * some acks can be missing but there is still time
+ */
+ uint32_t message_pos;
+
+ /**
+ * current number for message outgoing, to distinguish between the messages
+ */
+ uint32_t message_id_out;
+};
+
+/**
+ * Header for messages which need fragmentation
+ */
+struct FragmentationAckHeader
+{
+
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * ID of message, to distinguish between the messages, picked randomly.
+ */
+ uint32_t message_id GNUNET_PACKED;
+
+ /**
+ * Offset or number of this fragment, for fragmentation/segmentation (design choice, TBD)
+ */
+ uint64_t fragment_field GNUNET_PACKED;
+
+};
+
+static void
+do_transmit(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+/**
+ * Sets a bit active in the bitArray. Increment bit-specific
+ * usage counter on disk only if below 4bit max (==15).
+ *
+ * @param bitArray memory area to set the bit in
+ * @param bitIdx which bit to set
+ */
+static void
+setBit(char *bitArray, unsigned int bitIdx)
+{
+ size_t arraySlot;
+ unsigned int targetBit;
+
+ arraySlot = bitIdx / 8;
+ targetBit = (1L << (bitIdx % 8));
+ bitArray[arraySlot] |= targetBit;
+}
+
+/**
+ * Checks if a bit is active in the bitArray
+ *
+ * @param bitArray memory area to set the bit in
+ * @param bitIdx which bit to test
+ * @return GNUNET_YES if the bit is set, GNUNET_NO if not.
+ */
+static int
+testBit(char *bitArray, unsigned int bitIdx)
+{
+ size_t slot;
+ unsigned int targetBit;
+
+ slot = bitIdx / 8;
+ targetBit = (1L << (bitIdx % 8));
+ if (bitArray[slot] & targetBit)
+ return GNUNET_YES;
+ return GNUNET_NO;
+}
+
+/**
+ * get the next message number, at the moment just a random one
+ * @return returns the next valid message-number for sending packets
+ */
+static uint32_t
+get_next_message_id()
+{
+ return GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
+}
+
+/**
+ * search for a session with the addr
+ *
+ * @param plugin pointer to the plugin struct
+ * @param addr pointer to the mac address of the peer
+ * @return returns the session
+ */
+static struct Session *
+search_session(struct Plugin *plugin, const struct MacAddress *addr)
+{
+ struct Sessionqueue * queue = plugin->sessions;
+
+ while (queue != NULL)
+ {
+ GNUNET_assert (queue->content != NULL);
+ if (memcmp(addr, &queue->content->addr, sizeof(struct MacAddress)) == 0)
+ return queue->content; /* session found */
+ queue = queue->next;
+ }
+ return NULL;
+}
+
+/**
+ * Function called for a quick conversion of the binary address to
+ * a numeric address. Note that the caller must not free the
+ * address and that the next call to this function is allowed
+ * to override the address again.
+ *
+ * @param cls closure
+ * @param addr binary address
+ * @param addrlen length of the address
+ * @return string representing the same address
+ */
+static const char*
+wlan_plugin_address_to_string(void *cls, const void *addr, size_t addrlen)
+{
+ static char ret[40];
+ const struct MacAddress *mac;
+
+ if (addrlen != sizeof(struct MacAddress))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ mac = addr;
+ GNUNET_snprintf(ret, sizeof(ret), "%s Mac-Address %X:%X:%X:%X:%X:%X",
+ PROTOCOL_PREFIX, mac->mac[0], mac->mac[1], mac->mac[2], mac->mac[3],
+ mac->mac[4], mac->mac[5]);
+ return ret;
+}
+
+/**
+ * create a new session
+ *
+ * @param plugin pointer to the plugin struct
+ * @param addr pointer to the mac address of the peer
+ * @return returns the session
+ */
+
+static struct Session *
+create_session(struct Plugin *plugin, const struct MacAddress * addr)
+{
+ struct Sessionqueue * queue = GNUNET_malloc (sizeof (struct Sessionqueue));
+
+ GNUNET_CONTAINER_DLL_insert_tail(plugin->sessions, plugin->sessions_tail, queue);
+
+ queue->content = GNUNET_malloc (sizeof (struct Session));
+ queue->content->plugin = plugin;
+ queue->content->addr = *addr;
+ queue->content->fragment_messages_out_count = 0;
+ queue->content->fragment_messages_in_count = 0;
+
+ plugin->session_count++;
+
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "New session %p with %s\n",
+ queue->content, wlan_plugin_address_to_string(NULL, addr, 6));
+#endif
+
+ return queue->content;
+}
+
+/**
+ * Get session from address, create if no session exists
+ *
+ * @param plugin pointer to the plugin struct
+ * @param addr pointer to the mac address of the peer
+ * @return returns the session
+ */
+static struct Session *
+get_session(struct Plugin *plugin, const struct MacAddress *addr)
+{
+ struct Session * session = search_session(plugin, addr);
+ if (session != NULL)
+ return session;
+ return create_session(plugin, addr);
+}
+
+/**
+ * Queue the session to send data
+ * checks if there is a message pending
+ * checks if this session is not allready in the queue
+ * @param plugin pointer to the plugin
+ * @param session pointer to the session to add
+ */
+static void
+queue_session(struct Plugin *plugin, struct Session * session)
+{
+ struct Sessionqueue * queue = plugin->pending_Sessions_head;
+
+ if (session->pending_message != NULL)
+ {
+ while (queue != NULL)
+ {
+ // content is never NULL
+ GNUNET_assert (queue->content != NULL);
+ // is session already in queue?
+ if (session == queue->content)
+ {
+ return;
+ }
+ // try next
+ queue = queue->next;
+ }
+
+ // Session is not in the queue
+
+ queue = GNUNET_malloc (sizeof (struct Sessionqueue));
+ queue->content = session;
+
+ //insert at the tail
+ GNUNET_CONTAINER_DLL_insert_tail(plugin->pending_Sessions_head,
+ plugin->pending_Sessions_tail, queue);
+ plugin->pendingsessions++;
+ }
+
+}
+
+/**
+ * Function to schedule the write task, executed after a delay
+ * @param cls pointer to the plugin struct
+ * @param tc GNUNET_SCHEDULER_TaskContext pointer
+ */
+static void
+delay_fragment_task(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Plugin * plugin = cls;
+ plugin->server_write_delay_task = GNUNET_SCHEDULER_NO_TASK;
+
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+
+ // GNUNET_TIME_UNIT_FOREVER_REL is needed to clean up old msg
+ if (plugin->server_write_task == GNUNET_SCHEDULER_NO_TASK)
+ {
+ plugin->server_write_task = GNUNET_SCHEDULER_add_write_file(
+ GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdin_handle,
+ &do_transmit, plugin);
+ }
+}
+
+/**
+ * Function to calculate the time of the next periodic "hello-beacon"
+ * @param plugin pointer to the plugin struct
+ */
+
+static void
+set_next_beacon_time(struct Plugin * const plugin)
+{
+ //under 10 known peers: once a second
+ if (plugin->session_count < 10)
+ {
+ plugin->beacon_time = GNUNET_TIME_absolute_add(
+ GNUNET_TIME_absolute_get(), GNUNET_TIME_relative_multiply(
+ GNUNET_TIME_UNIT_SECONDS, HALLO_BEACON_SCALING_FACTOR));
+ }
+ //under 30 known peers: every 10 seconds
+ else if (plugin->session_count < 30)
+ {
+ plugin->beacon_time = GNUNET_TIME_absolute_add(
+ GNUNET_TIME_absolute_get(), GNUNET_TIME_relative_multiply(
+ GNUNET_TIME_UNIT_SECONDS, 10 * HALLO_BEACON_SCALING_FACTOR));
+ }
+ //over 30 known peers: once a minute
+ else
+ {
+ plugin->beacon_time = GNUNET_TIME_absolute_add(
+ GNUNET_TIME_absolute_get(), GNUNET_TIME_relative_multiply(
+ GNUNET_TIME_UNIT_MINUTES, HALLO_BEACON_SCALING_FACTOR));
+ }
+}
+
+/**
+ * Function to get the timeout value for acks for this session
+ * @param fm pointer to the FragmentMessage to get the next timeout
+ * @return time until the next ack should be received, in GNUNET_TIME_Relative
+ */
+static struct GNUNET_TIME_Relative
+get_ack_timeout(struct FragmentMessage * fm)
+{
+ return FRAGMENT_TIMEOUT;
+}
+
+/**
+ * Function to set the timer for the next timeout of the fragment queue
+ * @param plugin the handle to the plugin struct
+ */
+
+static void
+set_next_send(struct Plugin * const plugin)
+{
+ struct FragmentMessage * fm;
+ struct GNUNET_TIME_Relative next_send;
+ struct GNUNET_TIME_Absolute next_send_tmp;
+
+ //cancel old task
+ if (plugin->server_write_delay_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel(plugin->server_write_delay_task);
+ plugin->server_write_delay_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+
+ fm = GNUNET_CONTAINER_heap_peek(plugin->pending_Fragment_Messages);
+
+ //check if some acks are in the queue
+ if (plugin->ack_send_queue_head != NULL)
+ {
+ next_send = GNUNET_TIME_UNIT_ZERO;
+ }
+
+ //check if there are some fragments in the queue
+ else
+ {
+ next_send = GNUNET_TIME_absolute_get_remaining(plugin->beacon_time);
+ if (fm != NULL)
+ {
+ next_send_tmp.abs_value = GNUNET_CONTAINER_heap_node_get_cost(
+ fm->node);
+ next_send = GNUNET_TIME_relative_min(next_send,
+ GNUNET_TIME_absolute_get_remaining(next_send_tmp));
+
+ }
+ }
+
+#if DEBUG_wlan
+
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Next packet is send in: %u\n",
+ next_send.rel_value);
+
+#endif
+
+ if (next_send.rel_value == GNUNET_TIME_UNIT_ZERO.rel_value)
+ {
+ if (plugin->server_write_task == GNUNET_SCHEDULER_NO_TASK)
+ {
+ plugin->server_write_task = GNUNET_SCHEDULER_add_write_file(
+ GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdin_handle,
+ &do_transmit, plugin);
+ }
+ }
+ else
+ {
+ plugin->server_write_delay_task
+ = GNUNET_SCHEDULER_add_delayed(next_send,
+ &delay_fragment_task, plugin);
+ }
+}
+
+/**
+ * Function to get the next queued Session, removes the session from the queue
+ * @param plugin pointer to the plugin struct
+ * @return pointer to the session found, returns NULL if there is now session in the queue
+ */
+static struct Session *
+get_next_queue_session(struct Plugin * plugin)
+{
+ struct Session * session;
+ struct Sessionqueue * sessionqueue;
+ struct Sessionqueue * sessionqueue_alt;
+ struct PendingMessage * pm;
+ sessionqueue = plugin->pending_Sessions_head;
+
+ while (sessionqueue != NULL)
+ {
+ session = sessionqueue->content;
+
+ GNUNET_assert(session != NULL);
+ pm = session->pending_message;
+
+
+#if DEBUG_wlan
+ if (pm == NULL)
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
+ "pending message is empty, should not happen. session %p\n",
+ session);
+ }
+#endif
+
+ GNUNET_assert(pm != NULL);
+
+ //check for message timeout
+ if (GNUNET_TIME_absolute_get_remaining(pm->timeout).rel_value > 0)
+ {
+ //check if session has no message in the fragment queue
+ if (session->fragment_messages_out_count
+ < FRAGMENT_QUEUE_MESSAGES_OUT_PER_SESSION)
+ {
+ plugin->pendingsessions--;
+ GNUNET_CONTAINER_DLL_remove (plugin->pending_Sessions_head,
+ plugin->pending_Sessions_tail, sessionqueue);
+ GNUNET_free(sessionqueue);
+
+ return session;
+ }
+ else
+ {
+ sessionqueue = sessionqueue->next;
+ }
+ }
+ else
+ {
+
+ session->pending_message = session->pending_message2;
+ session->pending_message2 = NULL;
+
+ //call the cont func that it did not work
+ if (pm->transmit_cont != NULL)
+ pm->transmit_cont(pm->transmit_cont_cls, &(session->target),
+ GNUNET_SYSERR);
+ GNUNET_free(pm->msg);
+ GNUNET_free(pm);
+
+ if (session->pending_message == NULL)
+ {
+ sessionqueue_alt = sessionqueue;
+ sessionqueue = sessionqueue->next;
+ plugin->pendingsessions--;
+ GNUNET_CONTAINER_DLL_remove (plugin->pending_Sessions_head,
+ plugin->pending_Sessions_tail, sessionqueue_alt);
+
+ GNUNET_free(sessionqueue_alt);
+ }
+
+ }
+
+ }
+ return NULL;
+}
+
+/**
+ * frees the space of a message in the fragment queue (send queue)
+ * @param plugin the plugin struct
+ * @param fm message to free
+ */
+static void
+free_fragment_message(struct Plugin * plugin, struct FragmentMessage * fm)
+{
+ struct Session * session = fm->session;
+
+ if (fm != NULL)
+ {
+ (session->fragment_messages_out_count)--;
+ GNUNET_free_non_null(fm->msg);
+ GNUNET_CONTAINER_heap_remove_node(fm->node);
+ GNUNET_free(fm);
+
+ queue_session(plugin, session);
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "free pending fragment messages, pending messages remaining %u\n",
+ GNUNET_CONTAINER_heap_get_size(plugin->pending_Fragment_Messages));
+#endif
+ }
+}
+
+/**
+ * Function to check if there is some space in the fragment queue
+ * inserts a message if space is available
+ * @param plugin the plugin struct
+ */
+
+static void
+check_fragment_queue(struct Plugin * plugin)
+{
+ struct Session * session;
+ struct FragmentMessage * fm;
+ struct GNUNET_PeerIdentity pid;
+
+ struct PendingMessage * pm;
+
+ if (GNUNET_CONTAINER_heap_get_size(plugin->pending_Fragment_Messages)
+ < FRAGMENT_QUEUE_SIZE)
+ {
+ session = get_next_queue_session(plugin);
+ if (session != NULL)
+ {
+ pm = session->pending_message;
+ session->pending_message = NULL;
+ session->fragment_messages_out_count++;
+ GNUNET_assert(pm != NULL);
+
+ fm = GNUNET_malloc(sizeof(struct FragmentMessage));
+ fm->message_size = pm->message_size;
+ fm->msg = pm->msg;
+ fm->session = session;
+ fm->timeout.abs_value = pm->timeout.abs_value;
+ fm->message_pos = 0;
+ fm->next_ack = GNUNET_TIME_absolute_get();
+ fm->message_id_out = get_next_message_id();
+ fm->ack_bitfield = 0;
+ fm->node = GNUNET_CONTAINER_heap_insert(
+ plugin->pending_Fragment_Messages, fm,
+ GNUNET_TIME_absolute_get().abs_value);
+
+ GNUNET_assert(session !=NULL);
+
+ if (pm->transmit_cont != NULL)
+ {
+ pid = session->target;
+ pm->transmit_cont(pm->transmit_cont_cls, &pid, GNUNET_OK);
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "called pm->transmit_cont for %p\n", session);
+#endif
+ }
+ else
+ {
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "no pm->transmit_cont for %p\n", session);
+#endif
+ }
+ GNUNET_free(pm);
+
+ if (session->pending_message2 != NULL)
+ {
+ session->pending_message = session->pending_message2;
+ session->pending_message2 = NULL;
+ //requeue session
+ queue_session(plugin, session);
+ }
+
+ }
+ }
+
+ //check if timeout changed
+ set_next_send(plugin);
+}
+
+/**
+ * Funktion to check if all fragments where send and the acks received
+ * frees the space if finished
+ * @param plugin the plugin struct
+ * @param fm the message to check
+ */
+static void
+check_finished_fragment(struct Plugin * plugin, struct FragmentMessage * fm)
+{
+ //maxack = size of message / max packet size, eg 12 / 5 = 2 start at 0 so ack numbers are 0,1,2
+ unsigned int maxack = 63 - ((fm->message_size - 1) / (WLAN_MTU
+ - sizeof(struct FragmentationHeader)));
+ uint64_t tmpfield = UINT64_MAX;
+ tmpfield = tmpfield >> maxack;
+
+#if DEBUG_wlan
+ if (maxack != 63)
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Test bitfields %X and %X, maxack is %u, fm size %u\n",
+ fm->ack_bitfield, tmpfield, maxack, fm->message_size);
+#endif
+
+ if (fm->ack_bitfield == tmpfield)
+ {
+
+#if DEBUG_wlan_retransmission
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Finished sending and got all acks; message_id %u\n",
+ fm->message_id_out);
+#endif
+
+ free_fragment_message(plugin, fm);
+
+ check_fragment_queue(plugin);
+
+ }
+}
+
+/**
+ * Function to set the next fragment number
+ * @param fm use this FragmentMessage
+ */
+
+static void
+set_next_message_fragment_pos(struct Plugin * plugin,
+ struct FragmentMessage * fm)
+{
+
+ fm->message_pos++;
+
+ //check if retransmit is needed
+ if (GNUNET_TIME_absolute_get_remaining(fm->next_ack).rel_value == 0)
+ {
+
+ // be positive and try again later :-D
+ fm->next_ack = GNUNET_TIME_relative_to_absolute(get_ack_timeout(fm));
+ // find first missing fragment
+
+ fm->message_pos = 0;
+
+ GNUNET_CONTAINER_heap_update_cost(plugin->pending_Fragment_Messages,
+ fm->node, 0);
+
+#if DEBUG_wlan_retransmission
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Retransmit; message_id %u; fragment number %i, size: %u\n",
+ fm->message_id_out, fm->message_pos, fm->message_size);
+#endif
+ }
+
+ //test if ack 0 (or X) was already received
+ while (testBit((char*) &fm->ack_bitfield, fm->message_pos) == GNUNET_YES)
+ {
+ fm->message_pos++;
+ }
+
+}
+
+//TODO DOXIGEN
+static int
+getRadiotapHeader(struct Plugin * plugin, struct Session * session,
+ struct Radiotap_Send * header)
+{
+
+ if (session != NULL)
+ {
+ header->rate = session->rate;
+ header->tx_power = session->tx_power;
+ header->antenna = session->antenna;
+ }
+ else
+ {
+ header->rate = 255;
+ header->tx_power = 0;
+ header->antenna = 0;
+ }
+
+ return GNUNET_YES;
+}
+
+/**
+ * function to generate the wlan hardware header for one packet
+ * @param Header address to write the header to
+ * @param to_mac_addr address of the recipient
+ * @param plugin pointer to the plugin struct
+ * @return GNUNET_YES if there was no error
+ */
+static int
+getWlanHeader(struct ieee80211_frame * Header,
+ const struct MacAddress * to_mac_addr, struct Plugin * plugin,
+ unsigned int size)
+{
+ uint16_t * tmp16;
+ const int rate = 11000000;
+
+ Header->i_fc[0] = 0x08;
+ Header->i_fc[1] = 0x00;
+ memcpy(&Header->i_addr3, &mac_bssid, sizeof(mac_bssid));
+ memcpy(&Header->i_addr2, plugin->mac_address.mac, sizeof(plugin->mac_address));
+ memcpy(&Header->i_addr1, to_mac_addr, sizeof(struct MacAddress));
+
+ tmp16 = (uint16_t*) Header->i_dur;
+ *tmp16 = (uint16_t) htole16((size * 1000000) / rate + 290);
+
+ return GNUNET_YES;
+}
+
+/**
+ * 32bit CRC
+ *
+ * @param msgbuf pointer tor the data
+ * @param msgbuf_size size of the data
+ *
+ * @return 32bit crc value
+ */
+
+uint32_t
+getcrc32(const char *msgbuf, size_t msgbuf_size)
+{
+ //TODO calc some crc
+ return 0;
+}
+
+/**
+ * 16bit CRC
+ *
+ * @param msgbuf pointer tor the data
+ * @param msgbuf_size size of the data
+ *
+ * @return 16bit crc value
+ */
+
+uint16_t
+getcrc16(const char *msgbuf, size_t msgbuf_size)
+{
+ //TODO calc some crc
+ return 0;
+}
+
+//TODO DOXIGEN
+static void
+send_hello_beacon(struct Plugin * plugin)
+{
+
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sending hello beacon\n");
+#endif
+
+ uint16_t size;
+ ssize_t bytes;
+ uint16_t hallo_size;
+ struct GNUNET_MessageHeader * msgheader;
+ struct ieee80211_frame * ieeewlanheader;
+ struct Radiotap_Send * radioHeader;
+ struct GNUNET_MessageHeader * msgheader2;
+
+ hallo_size = GNUNET_HELLO_size(*(plugin->env->our_hello));
+ GNUNET_assert(sizeof(struct WlanHeader) + hallo_size <= WLAN_MTU);
+ size = sizeof(struct GNUNET_MessageHeader) + sizeof(struct Radiotap_Send)
+ + sizeof(struct ieee80211_frame) + sizeof(struct GNUNET_MessageHeader)
+ + hallo_size;
+
+ msgheader = GNUNET_malloc(size);
+ msgheader->size = htons(size);
+ msgheader->type = htons(GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA);
+
+ radioHeader = (struct Radiotap_Send*) &msgheader[1];
+ getRadiotapHeader(plugin, NULL, radioHeader);
+ ieeewlanheader = (struct ieee80211_frame*) &radioHeader[1];
+ getWlanHeader(ieeewlanheader, &bc_all_mac, plugin, size);
+
+ msgheader2 = (struct GNUNET_MessageHeader*) &ieeewlanheader[1];
+ msgheader2->size = htons(GNUNET_HELLO_size(*(plugin->env->our_hello))
+ + sizeof(struct GNUNET_MessageHeader));
+
+ msgheader2->type = htons(GNUNET_MESSAGE_TYPE_WLAN_ADVERTISEMENT);
+ memcpy(&msgheader2[1], *plugin->env->our_hello, hallo_size);
+
+ bytes = GNUNET_DISK_file_write(plugin->server_stdin_handle, msgheader, size);
+
+ if (bytes == GNUNET_SYSERR)
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
+ _("Error writing to wlan healper. errno == %d, ERROR: %s\n"),
+ errno, strerror(errno));
+
+ }
+ GNUNET_assert(bytes != GNUNET_SYSERR);
+ GNUNET_assert(bytes == size);
+ GNUNET_free(msgheader);
+
+ set_next_beacon_time(plugin);
+ set_next_send(plugin);
+}
+
+//TODO DOXIGEN
+static void
+send_ack(struct Plugin * plugin, struct AckSendQueue * ack)
+{
+
+ uint16_t size;
+ ssize_t bytes;
+ struct GNUNET_MessageHeader * msgheader;
+ struct ieee80211_frame * ieeewlanheader;
+ struct Radiotap_Send * radioHeader;
+ struct FragmentationAckHeader * msgheader2;
+
+ GNUNET_assert(sizeof(struct FragmentationAckHeader) <= WLAN_MTU);
+
+ size = sizeof(struct GNUNET_MessageHeader) + sizeof(struct Radiotap_Send)
+ + sizeof(struct ieee80211_frame) + sizeof(struct FragmentationAckHeader);
+
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Sending ack for message_id %u with fragment field %u, size %u\n",
+ ack->message_id, ack->fragments_field, size
+ - sizeof(struct Radiotap_Send));
+#endif
+
+ msgheader = GNUNET_malloc(size);
+ msgheader->size = htons(size);
+ msgheader->type = htons(GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA);
+
+ radioHeader = (struct Radiotap_Send*) &msgheader[1];
+ getRadiotapHeader(plugin, ack->session, radioHeader);
+ ieeewlanheader = (struct ieee80211_frame*) &radioHeader[1];
+ getWlanHeader(ieeewlanheader, &ack->session->addr, plugin, size);
+
+ msgheader2 = (struct FragmentationAckHeader*) &ieeewlanheader[1];
+ msgheader2->header.size = htons(sizeof(struct FragmentationAckHeader));
+ msgheader2->header.type = htons(GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT_ACK);
+ msgheader2->message_id = htonl(ack->message_id);
+ msgheader2->fragment_field = GNUNET_htonll(ack->fragments_field);
+
+ bytes = GNUNET_DISK_file_write(plugin->server_stdin_handle, msgheader, size);
+ if (bytes == GNUNET_SYSERR)
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
+ _("Error writing to wlan healper. errno == %d, ERROR: %s\n"),
+ errno, strerror(errno));
+
+ }
+ GNUNET_assert(bytes != GNUNET_SYSERR);
+ GNUNET_assert(bytes == size);
+ GNUNET_free(msgheader);
+ set_next_send(plugin);
+}
+
+//TODO DOXIGEN
+static void
+finish_sending(void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Finish_send * finish = cls;
+ struct Plugin * plugin;
+ ssize_t bytes;
+
+ plugin = finish->plugin;
+ plugin->server_write_task = GNUNET_SCHEDULER_NO_TASK;
+
+ if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
+ {
+ GNUNET_free (finish->msgstart);
+ GNUNET_free (finish);
+ return;
+ }
+ bytes = GNUNET_DISK_file_write (plugin->server_stdin_handle,
+ finish->msgheader,
+ finish->size);
+ GNUNET_assert (bytes != GNUNET_SYSERR);
+
+ if (bytes != finish->size)
+ {
+ finish->msgheader = finish->msgheader + bytes;
+ finish->size = finish->size - bytes;
+ plugin->server_write_task
+ = GNUNET_SCHEDULER_add_write_file(GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->server_stdin_handle,
+ &finish_sending, finish);
+ }
+ else
+ {
+ GNUNET_free(finish->msgstart);
+ GNUNET_free(finish);
+ set_next_send(plugin);
+ }
+}
+
+/**
+ * Function called when wlan helper is ready to get some data
+ *
+ * @param cls closure
+ * @param tc GNUNET_SCHEDULER_TaskContext
+ */
+static void
+do_transmit(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Plugin * plugin = cls;
+
+ plugin->server_write_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+
+ struct Session * session;
+ struct FragmentMessage * fm;
+ struct ieee80211_frame * ieeewlanheader;
+ struct Radiotap_Send * radioHeader;
+ struct GNUNET_MessageHeader * msgheader;
+ struct FragmentationHeader fragheader;
+ struct FragmentationHeader * fragheaderptr;
+ struct Finish_send * finish;
+ struct AckSendQueue * ack;
+ uint16_t size;
+ ssize_t bytes;
+ const char * copystart;
+ uint16_t copysize;
+ uint copyoffset;
+ struct GNUNET_TIME_Absolute next_send;
+
+ if (plugin->ack_send_queue_head != NULL)
+ {
+ ack = plugin->ack_send_queue_head;
+ GNUNET_CONTAINER_DLL_remove(plugin->ack_send_queue_head,
+ plugin->ack_send_queue_tail, ack);
+ send_ack(plugin, ack);
+ GNUNET_free(ack);
+ return;
+ }
+
+ //test if a "hello-beacon" has to be send
+ if (GNUNET_TIME_absolute_get_remaining(plugin->beacon_time).rel_value == 0)
+ {
+ send_hello_beacon(plugin);
+ return;
+ }
+
+ fm = GNUNET_CONTAINER_heap_peek(plugin->pending_Fragment_Messages);
+
+ if (fm != NULL)
+ {
+ session = fm->session;
+ GNUNET_assert(session != NULL);
+
+ // test if message timed out
+ if (GNUNET_TIME_absolute_get_remaining(fm->timeout).rel_value == 0)
+ {
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "message timeout\n");
+#endif
+
+ free_fragment_message(plugin, fm);
+ check_fragment_queue(plugin);
+
+ }
+ else
+ {
+
+ //if (fm->message_size > WLAN_MTU)
+ // {
+ size = sizeof(struct FragmentationHeader);
+
+ set_next_message_fragment_pos(plugin, fm);
+
+ copyoffset = (WLAN_MTU - sizeof(struct FragmentationHeader))
+ * fm->message_pos;
+
+ fragheader.fragment_off_or_num = htons(fm->message_pos);
+ fragheader.message_id = htonl(fm->message_id_out);
+ copystart = fm->msg + copyoffset;
+ copysize = GNUNET_MIN(fm->message_size - copyoffset,
+ WLAN_MTU - sizeof(struct FragmentationHeader));
+
+#if DEBUG_wlan
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_DEBUG,
+ "Sending GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT with message_id %u with fragment number %i, size: %u, offset %u, time until timeout %u\n",
+ fm->message_id_out, fm->message_pos, copysize
+ + sizeof(struct FragmentationHeader), copyoffset,
+ GNUNET_TIME_absolute_get_remaining(fm->timeout));
+#endif
+
+ if (copyoffset >= fm->message_size)
+ {
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_ERROR,
+ "offset in message for fragment too large, offset %u, size %u, max size %u, copysize %u, message_pos %u,\n",
+ copyoffset, fm->message_size, WLAN_MTU
+ - sizeof(struct FragmentationHeader), copysize,
+ fm->message_pos);
+ }
+ GNUNET_assert(copyoffset < fm->message_size);
+
+ fragheader.header.size = htons(copysize
+ + sizeof(struct FragmentationHeader));
+ fragheader.header.type = htons(GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT);
+
+ size += copysize;
+ size += sizeof(struct Radiotap_Send) + sizeof(struct ieee80211_frame)
+ + sizeof(struct GNUNET_MessageHeader);
+ msgheader = GNUNET_malloc(size);
+ msgheader->size = htons(size);
+ msgheader->type = htons(GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA);
+
+ radioHeader = (struct Radiotap_Send*) &msgheader[1];
+ getRadiotapHeader(plugin, session, radioHeader);
+
+ ieeewlanheader = (struct ieee80211_frame *) &radioHeader[1];
+ getWlanHeader(ieeewlanheader, &(fm->session->addr), plugin, size);
+
+ //could be faster if content is just send and not copyed before
+ //fragmentheader is needed
+ fragheader.message_crc = htons(getcrc16(copystart, copysize));
+ memcpy(&ieeewlanheader[1], &fragheader,
+ sizeof(struct FragmentationHeader));
+ fragheaderptr = (struct FragmentationHeader *) &ieeewlanheader[1];
+ memcpy(&fragheaderptr[1], copystart, copysize);
+
+ bytes = GNUNET_DISK_file_write(plugin->server_stdin_handle,
+ msgheader, size);
+ if (bytes == GNUNET_SYSERR)
+ {
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_ERROR,
+ _("Error writing to wlan healper. errno == %d, ERROR: %s\n"),
+ errno, strerror(errno));
+
+ }
+ GNUNET_assert(bytes != GNUNET_SYSERR);
+
+ //check if this was the last fragment of this message, if true then queue at the end of the list
+ if (copysize + copyoffset >= fm->message_size)
+ {
+ GNUNET_assert(copysize + copyoffset == fm->message_size);
+
+ GNUNET_CONTAINER_heap_update_cost(
+ plugin->pending_Fragment_Messages, fm->node, MIN(
+ fm->timeout.abs_value, fm->next_ack.abs_value));
+ // if fragments have opimized timeouts
+ //sort_fragment_into_queue(plugin,fm);
+
+
+#if DEBUG_wlan_retransmission
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_DEBUG,
+ "Finished sending all fragments waiting for acks; message_id %u; message_id %u; fragment number %i, size: %u, time until timeout %u\n",
+ fm->message_id_out, fm->message_id_out, fm->message_pos,
+ fm->message_size, GNUNET_TIME_absolute_get_remaining(
+ fm->timeout));
+#endif
+ }
+ else
+ {
+ GNUNET_CONTAINER_heap_update_cost(
+ plugin->pending_Fragment_Messages, fm->node,
+ GNUNET_TIME_absolute_get().abs_value);
+ }
+
+ if (bytes != size)
+ {
+ finish = GNUNET_malloc(sizeof( struct Finish_send));
+ finish->plugin = plugin;
+ finish->msgheader = (char *) msgheader + bytes;
+ finish->size = size - bytes;
+ finish->msgstart = msgheader;
+ finish ->next_send = next_send;
+
+ GNUNET_assert(plugin->server_write_task == GNUNET_SCHEDULER_NO_TASK);
+
+ plugin->server_write_task = GNUNET_SCHEDULER_add_write_file(
+ GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdin_handle,
+ &finish_sending, finish);
+
+ }
+ else
+ {
+ GNUNET_free(msgheader);
+ set_next_send(plugin);
+ }
+
+ }
+ return;
+ }
+
+ GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
+ "do_transmit did nothing, should not happen!\n");
+}
+
+/**
+ * Another peer has suggested an address for this
+ * peer and transport plugin. Check that this could be a valid
+ * address. If so, consider adding it to the list
+ * of addresses.
+ *
+ * @param cls closure
+ * @param addr pointer to the address
+ * @param addrlen length of addr
+ * @return GNUNET_OK if this is a plausible address for this peer
+ * and transport
+ */
+static int
+wlan_plugin_address_suggested(void *cls, const void *addr, size_t addrlen)
+{
+ //struct Plugin *plugin = cls;
+
+ /* check if the address is plausible; if so,
+ add it to our list! */
+
+ GNUNET_assert(cls !=NULL);
+ //FIXME mitm is not checked
+ //Mac Address has 6 bytes
+ if (addrlen == 6)
+ {
+ /* TODO check for bad addresses like multicast, broadcast, etc */
+ return GNUNET_OK;
+ }
+
+ return GNUNET_SYSERR;
+}
+
+/**
+ * Function that can be used by the transport service to transmit
+ * a message using the plugin.
+ *
+ * @param cls closure
+ * @param target who should receive this message
+ * @param priority how important is the message
+ * @param msgbuf the message to transmit
+ * @param msgbuf_size number of bytes in 'msgbuf'
+ * @param timeout when should we time out
+ * @param session which session must be used (or NULL for "any")
+ * @param addr the address to use (can be NULL if the plugin
+ * is "on its own" (i.e. re-use existing TCP connection))
+ * @param addrlen length of the address in bytes
+ * @param force_address GNUNET_YES if the plugin MUST use the given address,
+ * otherwise the plugin may use other addresses or
+ * existing connections (if available)
+ * @param cont continuation to call once the message has
+ * been transmitted (or if the transport is ready
+ * for the next transmission call; or if the
+ * peer disconnected...)
+ * @param cont_cls closure for cont
+ * @return number of bytes used (on the physical network, with overheads);
+ * -1 on hard errors (i.e. address invalid); 0 is a legal value
+ * and does NOT mean that the message was not transmitted (DV)
+ */
+static ssize_t
+wlan_plugin_send(void *cls, const struct GNUNET_PeerIdentity * target,
+ const char *msgbuf, size_t msgbuf_size, unsigned int priority,
+ struct GNUNET_TIME_Relative timeout, struct Session *session,
+ const void *addr, size_t addrlen, int force_address,
+ GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
+{
+ struct Plugin * plugin = cls;
+ struct PendingMessage * newmsg;
+ struct WlanHeader * wlanheader;
+
+ //check if msglen > 0
+ GNUNET_assert(msgbuf_size > 0);
+
+ //get session if needed
+ if (session == NULL)
+ {
+ if (wlan_plugin_address_suggested(plugin, addr, addrlen) == GNUNET_OK)
+ {
+ session = get_session(plugin, addr);
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
+ _("Wlan Address len %d is wrong\n"), addrlen);
+ return -1;
+ }
+ }
+
+ //TODO target "problem" not solved
+ //if (session->target != NULL){
+ // GNUNET_assert(session->target == *target);
+ //} else {
+ session->target = *target;
+ //}
+
+
+ //queue message:
+
+ //queue message in session
+ //test if there is no other message in the "queue"
+ //FIXME: to many send requests
+ //GNUNET_assert (session->pending_message == NULL);
+ if (session->pending_message != NULL)
+ {
+ newmsg = session->pending_message;
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_ERROR,
+ "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",
+ GNUNET_TIME_absolute_get_remaining(newmsg->timeout).rel_value,
+ session->fragment_messages_out_count);
+ if (session->pending_message2 != NULL)
+ {
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_ERROR,
+ "wlan_plugin_send: two pending messages are already in the queue for this client\n");
+ return -1;
+ }
+ }
+
+ newmsg = GNUNET_malloc(sizeof(struct PendingMessage));
+ (newmsg->msg) = GNUNET_malloc(msgbuf_size + sizeof(struct WlanHeader));
+ wlanheader = (struct WlanHeader *) newmsg->msg;
+ //copy msg to buffer, not fragmented / segmented yet, but with message header
+ wlanheader->header.size = htons(msgbuf_size + sizeof(struct WlanHeader));
+ wlanheader->header.type = htons(GNUNET_MESSAGE_TYPE_WLAN_DATA);
+ memcpy(&(wlanheader->target), target, sizeof(struct GNUNET_PeerIdentity));
+ wlanheader->crc = htonl(getcrc32(msgbuf, msgbuf_size));
+ memcpy(&wlanheader[1], msgbuf, msgbuf_size);
+ newmsg->transmit_cont = cont;
+ newmsg->transmit_cont_cls = cont_cls;
+ newmsg->timeout = GNUNET_TIME_relative_to_absolute(timeout);
+
+ newmsg->timeout.abs_value = newmsg->timeout.abs_value - 500;
+
+ newmsg->message_size = msgbuf_size + sizeof(struct WlanHeader);
+
+ if (session->pending_message == NULL)
+ {
+ session->pending_message = newmsg;
+ }
+ else
+ {
+ session->pending_message2 = newmsg;
+ }
+
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "New message for %p with size (incl wlan header) %u added\n", session,
+ newmsg->message_size);
+#endif
+
+ //queue session
+ queue_session(plugin, session);
+
+ check_fragment_queue(plugin);
+ //FIXME not the correct size
+ return msgbuf_size;
+
+}
+
+/**
+ * Iterate over the fragment messages of the given session.
+ *
+ * @param cls argument to give to iterator
+ * @param node node to iterate over
+ * @param element value stored at the node
+ * @param cost cost associated with the node
+ * @return GNUNET_YES if we should continue to iterate,
+ * GNUNET_NO if not.
+ */
+static int
+free_fragment_message_from_session(void *cls,
+ struct GNUNET_CONTAINER_HeapNode *node, void *element,
+ GNUNET_CONTAINER_HeapCostType cost)
+{
+ struct Plugin_Session_pair * pair = (struct Plugin_Session_pair *) cls;
+ struct FragmentMessage * fm = (struct FragmentMessage*) element;
+
+ if (fm->session == pair->session)
+ {
+
+ free_fragment_message(pair->plugin, fm);
+ }
+ return GNUNET_YES;
+
+}
+
+/**
+ * Search for fragment message with given id and session
+ *
+ * @param cls argument to give to iterator
+ * @param node node to iterate over
+ * @param element value stored at the node
+ * @param cost cost associated with the node
+ * @return GNUNET_YES if we should continue to iterate,
+ * GNUNET_NO if not.
+ */
+static int
+search_fragment_message_from_session_and_id(void *cls,
+ struct GNUNET_CONTAINER_HeapNode *node, void *element,
+ GNUNET_CONTAINER_HeapCostType cost)
+{
+ struct Session_id_fragment_triple * triple =
+ (struct Session_id_fragment_triple *) cls;
+ struct FragmentMessage * fm = (struct FragmentMessage*) element;
+
+ if ((fm->session == triple->session) && (fm->message_id_out
+ == triple->message_id))
+ {
+ triple->fm = fm;
+ return GNUNET_NO;
+ }
+ return GNUNET_YES;
+
+}
+
+/**
+ * function to get the message in the fragement queue (out) of a session with a specific id
+ * @param session pointer to the session
+ * @param message_id id of the message
+ * @return pointer to the struct FragmentMessage
+ */
+static struct FragmentMessage *
+get_fragment_message_from_session_and_id(struct Plugin * plugin,
+ struct Session * session, uint32_t message_id)
+{
+ struct Session_id_fragment_triple triple;
+ triple.session = session;
+ triple.message_id = message_id;
+ GNUNET_CONTAINER_heap_iterate(plugin->pending_Fragment_Messages,
+ &search_fragment_message_from_session_and_id, &triple);
+ return triple.fm;
+}
+
+/**
+ * function to get the receive message of a session
+ * @param plugin pointer to the plugin struct
+ * @param session session this fragment belongs to
+ */
+static struct Receive_Message_Queue *
+get_receive_message_from_session(struct Plugin * plugin,
+ struct Session * session)
+{
+ struct Receive_Message_Queue * rec_message = plugin->receive_messages_head;
+ while (rec_message != NULL)
+ {
+ if (rec_message->session == session)
+ {
+ return rec_message;
+ }
+ rec_message = rec_message->next;
+ }
+ return NULL;
+}
+
+/**
+ * Function to dispose the fragments received for a message and the message
+ * @param plugin pointer to the plugin struct
+ * @param rec_message pointer to the struct holding the message which should be freed
+ */
+static void
+free_receive_message(struct Plugin* plugin,
+ struct Receive_Message_Queue * rx_message)
+{
+ GNUNET_assert(rx_message !=NULL);
+ struct Receive_Fragment_Queue * rec_queue = rx_message->frag_head;
+ struct Receive_Fragment_Queue * rec_queue2;
+
+ while (rec_queue != NULL)
+ {
+ rec_queue2 = rec_queue;
+ rec_queue = rec_queue->next;
+ GNUNET_free(rec_queue2);
+ }
+
+ GNUNET_CONTAINER_DLL_remove(plugin->receive_messages_head,plugin->receive_messages_teil, rx_message);
+
+ GNUNET_assert(plugin->pending_receive_messages > 0);
+ GNUNET_assert(rx_message->session->fragment_messages_in_count > 0);
+
+ plugin->pending_receive_messages--;
+ rx_message->session->fragment_messages_in_count--;
+ GNUNET_free(rx_message);
+}
+
+/**
+ * function to get the receive message of a session
+ * @param plugin pointer to the plugin struct
+ * @param session session this fragment belongs to
+ */
+static void
+check_receive_message_timeouts(struct Plugin * plugin, struct Session * session)
+{
+ struct Receive_Message_Queue * rec_message = plugin->receive_messages_head;
+ while (rec_message != NULL)
+ {
+ if (GNUNET_TIME_absolute_get_remaining(rec_message->timeout).rel_value
+ == 0)
+ {
+ free_receive_message(plugin, rec_message);
+ }
+ rec_message = rec_message->next;
+ }
+
+}
+
+//TODO DOXIGEN
+static void
+free_session(struct Plugin * plugin, struct Sessionqueue * queue)
+{
+ struct Sessionqueue * pendingsession;
+ struct Sessionqueue * pendingsession_tmp;
+ struct PendingMessage * pm;
+ struct Receive_Message_Queue * receive_queue;
+ struct Plugin_Session_pair pair;
+ int check = 0;
+
+ GNUNET_assert(queue != NULL);
+ GNUNET_assert(queue->content != NULL);
+
+ //session found
+ //is this session pending for send
+ pendingsession = plugin->pending_Sessions_head;
+ while (pendingsession != NULL)
+ {
+ pendingsession_tmp = pendingsession->next;
+ if (pendingsession->content == queue->content)
+ {
+ plugin->pendingsessions--;
+ GNUNET_CONTAINER_DLL_remove (plugin->pending_Sessions_head,
+ plugin->pending_Sessions_tail,
+ pendingsession);
+ GNUNET_free(pendingsession);
+
+ GNUNET_assert (check == 0);
+ check = 1;
+ }
+ pendingsession = pendingsession_tmp;
+ }
+
+ //is something of this session in the fragment queue?
+ pair.plugin = plugin;
+ pair.session = queue->content;
+ GNUNET_CONTAINER_heap_iterate(plugin->pending_Fragment_Messages,
+ &free_fragment_message_from_session, &pair);
+
+ //dispose all received fragments
+ receive_queue = get_receive_message_from_session(plugin, queue->content);
+ while (receive_queue != NULL)
+ {
+ free_receive_message(plugin, receive_queue);
+ receive_queue = get_receive_message_from_session(plugin, queue->content);
+ }
+
+ // remove PendingMessage
+ pm = queue->content->pending_message;
+ if (pm != NULL)
+ {
+ GNUNET_free_non_null(pm->msg);
+ GNUNET_free(pm);
+ }
+
+ // remove PendingMessage
+ pm = queue->content->pending_message2;
+ if (pm != NULL)
+ {
+ GNUNET_free_non_null(pm->msg);
+ GNUNET_free(pm);
+ }
+
+ GNUNET_CONTAINER_DLL_remove(plugin->sessions,
+ plugin->sessions_tail,
+ queue);
+ GNUNET_free(queue->content);
+ GNUNET_free(queue);
+ plugin->session_count--;
+ check_fragment_queue(plugin);
+}
+
+/**
+ * Function that can be used to force the plugin to disconnect
+ * from the given peer and cancel all previous transmissions
+ * (and their continuation).
+ *
+ * @param cls closure
+ * @param target peer from which to disconnect
+ */
+static void
+wlan_plugin_disconnect(void *cls, const struct GNUNET_PeerIdentity *target)
+{
+ struct Plugin *plugin = cls;
+ struct Sessionqueue * queue = plugin->sessions;
+
+ // just look at all the session for the needed one
+ while (queue != NULL)
+ {
+ // content is never NULL
+ GNUNET_assert (queue->content != NULL);
+ if (memcmp(target, &(queue->content->target),
+ sizeof(struct GNUNET_PeerIdentity)) == 0)
+ {
+ free_session(plugin, queue);
+ return;
+ }
+ // try next
+ queue = queue->next;
+ }
+}
+
+/**
+ * Convert the transports address to a nice, human-readable
+ * format.
+ *
+ * @param cls closure
+ * @param type name of the transport that generated the address
+ * @param addr one of the addresses of the host, NULL for the last address
+ * the specific address format depends on the transport
+ * @param addrlen length of the address
+ * @param numeric should (IP) addresses be displayed in numeric form?
+ * @param timeout after how long should we give up?
+ * @param asc function to call on each string
+ * @param asc_cls closure for asc
+ */
+static void
+wlan_plugin_address_pretty_printer(void *cls, const char *type,
+ const void *addr, size_t addrlen, int numeric,
+ struct GNUNET_TIME_Relative timeout,
+ GNUNET_TRANSPORT_AddressStringCallback asc, void *asc_cls)
+{
+ char ret[92];
+ const unsigned char * input;
+
+ //GNUNET_assert(cls !=NULL);
+ if (addrlen != 6)
+ {
+ /* invalid address (MAC addresses have 6 bytes) */
+ GNUNET_break (0);
+ asc(asc_cls, NULL);
+ return;
+ }
+ input = (const unsigned char*) addr;
+ GNUNET_snprintf(ret, sizeof(ret),
+ "%s Mac-Address %.2X:%.2X:%.2X:%.2X:%.2X:%.2X", PROTOCOL_PREFIX,
+ input[0], input[1], input[2], input[3], input[4], input[5]);
+ asc(asc_cls, ret);
+}
+
+
+/**
+ * Function to test if fragment number already exists in the fragments received
+ *
+ * @param rec_message message this fragment belongs to
+ * @param fh Fragmentheader of the fragment
+ * @return GNUNET_YES if fragment exists already, GNUNET_NO if it does not exists in the queue of the session
+ */
+static int
+is_double_msg(struct Receive_Message_Queue * rx_msg,
+ struct FragmentationHeader * fh)
+{
+ //test if bitfield is okay
+#if DEBUG_wlan
+ check_message_fragment_bitfield(rx_msg);
+#endif
+
+ return testBit((char *) &rx_msg->received_fragments, ntohs(
+ fh->fragment_off_or_num));
+
+}
+
+/**
+ * Function to insert a fragment in a queue of a message
+ * @param session session the fragment belongs to
+ * @param rec_queue fragment to add
+ */
+static void
+insert_fragment_in_queue(struct Receive_Message_Queue * rx_message,
+ struct Receive_Fragment_Queue * rx_frag)
+{
+ GNUNET_assert(rx_message != NULL);
+ GNUNET_assert(rx_frag != NULL);
+
+ struct Receive_Fragment_Queue * rx_frag2 = rx_message->frag_head;
+ struct WlanHeader * wlanheader;
+
+ //this is the first fragment of the message (fragment id 0)
+ if (rx_frag->num == 0)
+ {
+ wlanheader = (struct WlanHeader *) rx_frag->msg;
+ rx_message->rec_size = ntohs(wlanheader->header.size);
+ }
+
+ //sort into list
+ while (rx_frag2 != NULL)
+ {
+ if (rx_frag2->num > rx_frag->num)
+ {
+ //next element number is grater than the current num
+ GNUNET_CONTAINER_DLL_insert_before(rx_message->frag_head, rx_message->frag_tail, rx_frag2, rx_frag);
+ setBit((char *) &rx_message->received_fragments, rx_frag->num);
+ return;
+ }
+ rx_frag2 = rx_frag2->next;
+ }
+
+ //no element has a grater number
+ GNUNET_CONTAINER_DLL_insert_tail(rx_message->frag_head, rx_message->frag_tail, rx_frag);
+
+ setBit((char *) &rx_message->received_fragments, rx_frag->num);
+}
+
+/**
+ * handels the data after all fragments are put together
+ * @param plugin
+ * @param session_light
+ * @param hdr pointer to the data
+ */
+static void
+wlan_data_message_handler(void *cls, void *client,
+ const struct GNUNET_MessageHeader *hdr)
+{
+ struct Plugin * plugin = (struct Plugin*) cls;
+ struct Session_light * session_light = (struct Session_light *) client;
+ struct WlanHeader * wlanheader;
+ struct Session * session;
+ const char * tempmsg;
+ const struct GNUNET_MessageHeader * temp_hdr;
+ struct GNUNET_PeerIdentity tmptarget;
+
+ if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_DATA)
+ {
+
+#if DEBUG_wlan
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_DEBUG,
+ "Func wlan_data_message_handler got GNUNET_MESSAGE_TYPE_WLAN_DATA size: %u\n",
+ ntohs(hdr->size));
+#endif
+
+ if (ntohs(hdr->size) < sizeof(struct WlanHeader)
+ + sizeof(struct GNUNET_MessageHeader))
+ {
+ //packet not big enought
+ return;
+ }
+
+ GNUNET_assert(session_light != NULL);
+ if (session_light->session == NULL)
+ {
+ session_light->session = search_session(plugin, &session_light->addr);
+ }
+ session = session_light->session;
+ wlanheader = (struct WlanHeader *) hdr;
+
+ tempmsg = (char*) &wlanheader[1];
+ temp_hdr = (const struct GNUNET_MessageHeader *) &wlanheader[1];
+
+ if (getcrc32(tempmsg, ntohs(wlanheader->header.size)) != ntohl(
+ wlanheader->crc))
+ {
+ //wrong crc, dispose message
+ GNUNET_log(GNUNET_ERROR_TYPE_INFO,
+ "Wlan message Header crc was wrong\n");
+ return;
+ }
+
+ //if not in session list
+ if (session == NULL)
+ {
+#if DEBUG_wlan
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_DEBUG,
+ "WLAN client not in session list: packet size = %u, inner size = %u, header size = %u\n",
+ ntohs(wlanheader->header.size), ntohs(temp_hdr->size),
+ sizeof(struct WlanHeader));
+#endif
+ //try if it is a hello message
+ if (ntohs(wlanheader->header.size) >= ntohs(temp_hdr->size)
+ + sizeof(struct WlanHeader))
+ {
+ if (ntohs(temp_hdr->type) == GNUNET_MESSAGE_TYPE_HELLO)
+ {
+ if (GNUNET_HELLO_get_id(
+ (const struct GNUNET_HELLO_Message *) temp_hdr,
+ &tmptarget) == GNUNET_OK)
+ {
+ session = create_session(plugin, &session_light->addr);
+ session_light->session = session;
+ memcpy(&session->target, &tmptarget,
+ sizeof(struct GNUNET_PeerIdentity));
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
+ "WLAN client not in session list and hello message not okay\n");
+ return;
+ }
+
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
+ "WLAN client not in session list and not a hello message\n");
+ return;
+ }
+ }
+ else
+ {
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_WARNING,
+ "WLAN client not in session list and message size in does not fit\npacket size = %u, inner size = %u, header size = %u\n",
+ ntohs(wlanheader->header.size), ntohs(temp_hdr->size),
+ sizeof(struct WlanHeader));
+ return;
+ }
+ }
+
+ //"receive" the message
+
+
+ GNUNET_SERVER_mst_receive(plugin->data_tokenizer, session,
+ (const char *) temp_hdr,
+ ntohs(hdr->size) - sizeof(struct WlanHeader), GNUNET_YES, GNUNET_NO);
+
+ return;
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
+ "wlan_data_message_handler got wrong message type\n");
+ return;
+ }
+}
+
+/**
+ * Function to check if all fragments of a message have been received
+ * @param plugin the plugin handle
+ * @param session_light information of the message sender
+ * @param session session the message belongs to
+ * @param rec_message pointer to the message that should be checked
+ */
+
+static void
+check_rx_finished_msg(struct Plugin* plugin,
+ struct Session_light * session_light, struct Session * session,
+ struct Receive_Message_Queue * rx_message)
+{
+ GNUNET_assert(rx_message !=NULL);
+
+ struct Receive_Fragment_Queue * rx_frag = rx_message->frag_head;
+ int packetsize = rx_message->rec_size;
+ int sum;
+ //TODO CLEANUP
+ //int aktnum;
+ uint64_t bitfield = 0;
+ //char * msg;
+
+ //check if first fragment is present
+ if (packetsize == MESSAGE_LENGHT_UNKNOWN)
+ {
+ return;
+ }
+ // test if message has at least the size of the WlanHeader and a GNUNET_MessageHeader
+
+ else if (packetsize < sizeof(struct WlanHeader)
+ + sizeof(struct GNUNET_MessageHeader))
+ {
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Message not big enough\n");
+#endif
+ free_receive_message(plugin, rx_message);
+ return;
+ }
+
+#if DEBUG_wlan
+ check_message_fragment_bitfield(rx_message);
+#endif
+
+ // if (rx_message->frag_tail->num == ffsl(rx_message->received_fragments))
+ // {
+ bitfield = ~bitfield;
+ bitfield = bitfield >> (63 - rx_message->frag_tail->num);
+ if (rx_message->received_fragments == bitfield)
+ {
+ sum = 0;
+ while (rx_frag != NULL)
+ {
+ sum += rx_frag->size;
+ rx_frag = rx_frag->next;
+ }
+ //sum should always be smaller or equal of
+ GNUNET_assert(sum <= packetsize);
+ if (sum == packetsize)
+ {
+
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "check_rec_finished_msg: A message for %p is complete\n", session);
+#endif
+
+ //TODO cleanup
+
+ //copy fragments together
+ //msg = GNUNET_malloc(packetsize);
+ rx_frag = rx_message->frag_head;
+ //aktnum = 0;
+ /*while (rx_frag != NULL)
+ {
+ //TODO SAVE SOME COPY OPS AND CHECK CRC WITHOUT COPY
+ memcpy(msg + aktnum, rx_frag->msg, rx_frag->size);
+ aktnum += rx_frag->size;
+ rx_frag = rx_frag->next;
+ }*/
+
+ while (rx_frag != NULL)
+ {
+ if (rx_frag->next != NULL)
+ {
+ GNUNET_SERVER_mst_receive(plugin->fragment_tokenizer,
+ session_light, rx_frag->msg, rx_frag->size, GNUNET_NO,
+ GNUNET_NO);
+ }
+ else
+ {
+ //if it is the last fragment just kill all leftover
+ GNUNET_SERVER_mst_receive(plugin->fragment_tokenizer,
+ session_light, rx_frag->msg, rx_frag->size, GNUNET_YES,
+ GNUNET_NO);
+ }
+ rx_frag = rx_frag->next;
+ }
+ free_receive_message(plugin, rx_message);
+ //call wlan_process_helper to process the message
+ //wlan_data_message_handler(plugin, session_light,
+ // (struct GNUNET_MessageHeader*) msg);
+ //wlan_data_helper (plugin, session_light, (struct GNUNET_MessageHeader*) msg);
+
+ //GNUNET_free(msg);
+ }
+ }
+ // }
+}
+
+//TODO DOXIGEN
+static void
+process_data(void *cls, void *client, const struct GNUNET_MessageHeader *hdr)
+{
+
+ GNUNET_assert(client != NULL);
+ GNUNET_assert(cls != NULL);
+ struct Session * session = (struct Session *) client;
+ struct Plugin * plugin = (struct Plugin *) cls;
+
+ struct GNUNET_TRANSPORT_ATS_Information distance[2];
+ distance[0].type = htonl(GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
+ distance[0].value = htonl(1);
+ distance[1].type = htonl(GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
+ distance[1].value = htonl(0);
+
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Calling plugin->env->receive for session %p; %s; size: %u\n", session,
+ wlan_plugin_address_to_string(NULL, session->addr.mac, 6), htons(
+ hdr->size));
+#endif
+
+ plugin->env->receive(plugin->env->cls, &(session->target), hdr,
+ (const struct GNUNET_TRANSPORT_ATS_Information *) &distance, 2, session,
+ (const char*) &session->addr, sizeof(session->addr));
+}
+
+/**
+ * function to add an ack to send it for a received fragment
+ * @param plugin pointer to the global plugin structure
+ * @param session pointer to the session this ack belongs to
+ * @param bitfield bitfield to send
+ * @param fh pointer to the fragmentation header which we would like to acknolage
+ */
+
+void
+add_ack_for_send(struct Plugin * plugin, struct Session * session,
+ uint64_t bitfield, struct FragmentationHeader * fh)
+{
+ struct AckSendQueue * ack;
+
+ GNUNET_assert(plugin != NULL);
+ GNUNET_assert(session != NULL);
+ GNUNET_assert(fh != NULL);
+
+ ack = GNUNET_malloc(sizeof(struct AckSendQueue));
+ ack->fragments_field = bitfield;
+ ack->message_id = ntohl(fh->message_id);
+ ack->session = session;
+
+ GNUNET_CONTAINER_DLL_insert_tail(plugin->ack_send_queue_head,
+ plugin->ack_send_queue_tail, ack);
+
+}
+
+/**
+ * function to get the receive message from the message id and the session
+ * @param plugin pointer to the plugin struct
+ * @param session session this fragment belongs to
+ * @param message_id id of the message
+ */
+
+struct Receive_Message_Queue *
+get_receive_message(struct Plugin * plugin, struct Session * session,
+ uint32_t message_id)
+{
+ struct Receive_Message_Queue * rec_message = plugin->receive_messages_head;
+ while (rec_message != NULL)
+ {
+ if ((rec_message->message_id_in == message_id) && (rec_message->session
+ == session))
+ {
+ return rec_message;
+ }
+ rec_message = rec_message->next;
+ }
+ return NULL;
+}
+
+/**
+ * function to insert a received fragment into the right fragment queue of the right message
+ * @param plugin pointer to the plugin struct
+ * @param session_light pointer to the session_light struct of this message
+ * @param session session this fragment belongs to
+ * @param fh pointer to the header of the fragment
+ * @return new fragment bitfield for the message
+ */
+
+uint64_t
+insert_fragment_in_in_message_queue(struct Plugin * plugin,
+ struct Session_light * session_light, struct Session * session,
+ struct FragmentationHeader * fh, const struct Radiotap_rx * rxinfo)
+{
+ struct Receive_Fragment_Queue * rx_frag = NULL;
+ struct Receive_Message_Queue * rx_message;
+ const char * tempmsg = (char*) &fh[1];
+ uint64_t retval = 0;
+
+ //TODO fragments do not timeout
+ //check if message_id is right or it is a new msg
+ GNUNET_assert(fh != NULL);
+
+ rx_message = get_receive_message(plugin, session, ntohl(fh->message_id));
+
+ if (rx_message == NULL)
+ {
+ if (session->fragment_messages_in_count < MESSAGES_IN_QUEUE_PER_SESSION)
+ {
+ check_receive_message_timeouts(plugin, session);
+ }
+
+ if (session->fragment_messages_in_count < MESSAGES_IN_QUEUE_PER_SESSION)
+ {
+
+ //new message incoming
+ rx_message = GNUNET_malloc(sizeof (struct Receive_Message_Queue));
+ rx_message->message_id_in = ntohl(fh->message_id);
+ rx_message->rec_size = MESSAGE_LENGHT_UNKNOWN;
+ rx_message->session = session;
+ rx_message->received_fragments = 0;
+
+ GNUNET_CONTAINER_DLL_insert(plugin->receive_messages_head, plugin->receive_messages_teil, rx_message);
+
+ session->fragment_messages_in_count++;
+ plugin->pending_receive_messages++;
+
+#if DEBUG_wlan
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_DEBUG,
+ "New fragmented message started: message id %u, messages in for this session %u, messages in %u\n",
+ rx_message->message_id_in, session->fragment_messages_in_count,
+ plugin->pending_receive_messages);
+#endif
+ }
+ else
+ {
+
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_INFO,
+ "WLAN fragment message_id and session message_id do not exist, max MESSAGES_IN_QUEUE_PER_SESSION reached, akt in message_id %u\n",
+ get_receive_message_from_session(plugin, session)->message_id_in);
+ setBit((char *) &retval, ntohs(fh->fragment_off_or_num));
+ return retval;
+ }
+ }
+
+ //reset timeout
+ rx_message->timeout = GNUNET_TIME_absolute_add(
+ GNUNET_TIME_absolute_get(),
+ MESSAGE_IN_TIMEOUT);
+
+ if (is_double_msg(rx_message, fh) != GNUNET_YES)
+ {
+
+ //report size
+ rx_frag = GNUNET_malloc(sizeof (struct Receive_Fragment_Queue) +
+ ntohs(fh->header.size) - sizeof(struct FragmentationHeader));
+ rx_frag->size = ntohs(fh->header.size)
+ - sizeof(struct FragmentationHeader);
+ rx_frag->num = ntohs(fh->fragment_off_or_num);
+ rx_frag->msg = (char*) &(rx_frag[1]);
+ //copy msg to buffer
+ memcpy((char *) rx_frag->msg, tempmsg, rx_frag->size);
+ memcpy((char *) &(rx_frag->rxinfo), rxinfo, sizeof(rxinfo));
+ insert_fragment_in_queue(rx_message, rx_frag);
+ //save bitfield
+ retval = rx_message->received_fragments;
+
+#if DEBUG_wlan
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_DEBUG,
+ "New fragment: size %u, fragsize %u, message id %u, bitfield %X, session %u\n",
+ rx_message->rec_size, rx_frag->size, rx_message->message_id_in,
+ rx_message->received_fragments, session);
+#endif
+
+ check_rx_finished_msg(plugin, session_light, session, rx_message);
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_INFO, "WLAN fragment is a clone\n");
+ retval = rx_message->received_fragments;
+
+ }
+ return retval;
+
+}
+
+/**
+ * Function used for to process the data received from the wlan interface
+ *
+ * @param cls the plugin handle
+ * @param session_light FIXME: document
+ * @param hdr hdr of the GNUNET_MessageHeader
+ */
+static void
+wlan_data_helper(void *cls, struct Session_light * session_light,
+ const struct GNUNET_MessageHeader * hdr, const struct Radiotap_rx * rxinfo)
+{
+ struct Plugin *plugin = cls;
+ struct Session * session;
+
+ struct FragmentationHeader * fh;
+ struct FragmentationAckHeader * fah;
+ struct FragmentMessage * fm;
+
+ const char * tempmsg;
+
+ uint64_t fragment_bitfield = 0;
+
+ //ADVERTISEMENT
+ if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_ADVERTISEMENT)
+ {
+
+ //TODO better DOS protection, error handling
+ //TODO test first than create session
+ GNUNET_assert(session_light != NULL);
+
+#if DEBUG_wlan
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_DEBUG,
+ "Func wlan_data_helper got GNUNET_MESSAGE_TYPE_WLAN_ADVERTISEMENT size: %u; %s\n",
+ ntohs(hdr->size), wlan_plugin_address_to_string(NULL,
+ session_light->addr.mac, 6));
+#endif
+
+ if (session_light->session == NULL)
+ {
+ session_light->session = get_session(plugin, &session_light->addr);
+ }
+ GNUNET_assert(GNUNET_HELLO_get_id(
+ (const struct GNUNET_HELLO_Message *) &hdr[1],
+ &(session_light->session->target) ) != GNUNET_SYSERR);
+
+ }
+
+ //FRAGMENT
+
+ else if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT)
+ {
+
+ GNUNET_assert(session_light != NULL);
+ if (session_light->session == NULL)
+ {
+ session_light->session = search_session(plugin, &session_light->addr);
+ }
+ session = session_light->session;
+
+ fh = (struct FragmentationHeader *) hdr;
+ tempmsg = (char*) &fh[1];
+
+#if DEBUG_wlan
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_DEBUG,
+ "Func wlan_data_helper got GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT with message_id %u with fragment number %i, size: %u; %s\n",
+ ntohl(fh->message_id), ntohs(fh->fragment_off_or_num), ntohs(
+ hdr->size), wlan_plugin_address_to_string(NULL,
+ session_light->addr.mac, 6));
+#endif
+
+ if (getcrc16(tempmsg, ntohs(fh->header.size)) != ntohs(fh->message_crc))
+ {
+ //wrong crc, dispose message
+ GNUNET_log(GNUNET_ERROR_TYPE_INFO, "WLAN fragment crc was wrong\n");
+ return;
+ }
+
+ //if in the session list
+ if (session != NULL)
+ {
+ fragment_bitfield = insert_fragment_in_in_message_queue(plugin,
+ session_light, session, fh, rxinfo);
+ }
+ else
+ {
+ // new session
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_INFO,
+ "WLAN client not in session list, fragment num %u, message id %u\n",
+ ntohs(fh->fragment_off_or_num), ntohl(fh->message_id));
+
+ GNUNET_SERVER_mst_receive(plugin->fragment_tokenizer, session_light,
+ tempmsg, ntohs(hdr->size) - sizeof(struct FragmentationHeader),
+ GNUNET_YES, GNUNET_NO);
+ //wlan_data_message_handler(plugin, session_light,
+ // (struct GNUNET_MessageHeader *) tempmsg);
+ session = session_light->session;
+ //test if a session was created
+ if (session == NULL)
+ {
+ return;
+ }
+ setBit((char *) &fragment_bitfield, ntohs(fh->fragment_off_or_num));
+ }
+
+ add_ack_for_send(plugin, session, fragment_bitfield, fh);
+ set_next_send(plugin);
+
+ }
+
+ //ACK
+
+ else if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT_ACK)
+ {
+
+#if DEBUG_wlan
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_DEBUG,
+ "Func wlan_data_helper got GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT_ACK size: %u; %s\n",
+ ntohs(hdr->size), wlan_plugin_address_to_string(NULL,
+ session_light->addr.mac, 6));
+#endif
+
+ GNUNET_assert(session_light != NULL);
+ if (session_light->session == NULL)
+ {
+ session_light->session = search_session(plugin, &session_light->addr);
+ GNUNET_assert(session_light->session != NULL);
+ }
+ session = session_light->session;
+ fah = (struct FragmentationAckHeader *) hdr;
+ fm = get_fragment_message_from_session_and_id(plugin, session, ntohl(
+ fah->message_id));
+
+ if (fm != NULL)
+ {
+
+ fm->ack_bitfield = fm->ack_bitfield | GNUNET_ntohll(
+ fah->fragment_field);
+ fm->next_ack = GNUNET_TIME_relative_to_absolute(get_ack_timeout(fm));
+
+#if DEBUG_wlan_retransmission
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Got ack for: %u; %u\n",
+ fm->message_id_out, fm->ack_bitfield);
+#endif
+ check_finished_fragment(plugin, fm);
+ set_next_send(plugin);
+
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
+ "WLAN fragment not in fragment list with id %u of ack\n", ntohl(
+ fah->message_id));
+ return;
+ }
+
+ }
+ else
+ {
+ // TODO Wrong data?
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_INFO,
+ "WLAN packet inside the WLAN helper packet has not the right type: %u size: %u\n",
+ ntohs(hdr->type), ntohs(hdr->size));
+ GNUNET_break(0);
+ return;
+ }
+
+#if 0
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Helper finished\n");
+#endif
+
+}
+
+//TODO DOXIGEN
+const char *
+macprinter(const u_int8_t * mac)
+{
+ static char macstr[20];
+
+ GNUNET_snprintf(macstr, sizeof(macstr), "%X:%X:%X:%X:%X:%X", mac[0], mac[1],
+ mac[2], mac[3], mac[4], mac[5]);
+ return macstr;
+}
+
+/**
+ * Function used for to process the data from the suid process
+ *
+ * @param cls the plugin handle
+ * @param client client that send the data (not used)
+ * @param hdr header of the GNUNET_MessageHeader
+ */
+static void
+wlan_process_helper(void *cls, void *client,
+ const struct GNUNET_MessageHeader *hdr)
+{
+ struct Plugin *plugin = cls;
+ struct ieee80211_frame * wlanIeeeHeader = NULL;
+ struct Session_light * session_light = NULL;
+ struct Radiotap_rx * rxinfo;
+ const struct GNUNET_MessageHeader * temp_hdr = NULL;
+
+ int datasize = 0;
+ int pos;
+
+ switch (ntohs(hdr->type))
+ {
+ case GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA:
+#if DEBUG_wlan
+ GNUNET_log(
+ GNUNET_ERROR_TYPE_DEBUG,
+ "Func wlan_process_helper got GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA size: %u\n",
+ ntohs(hdr->size));
+#endif
+
+ //call wlan_process_helper with the message inside, later with wlan: analyze signal
+ if (ntohs(hdr->size) < sizeof(struct ieee80211_frame)
+ + sizeof(struct GNUNET_MessageHeader) + sizeof(struct Radiotap_rx))
+ {
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Size of packet is too small; size: %u min size: %u\n", ntohs(
+ hdr->size), sizeof(struct ieee80211_frame)
+ + sizeof(struct GNUNET_MessageHeader));
+#endif
+ //GNUNET_break (0);
+ /* FIXME: restart SUID process */
+ return;
+ }
+ rxinfo = (struct Radiotap_rx *) &hdr[1];
+ wlanIeeeHeader = (struct ieee80211_frame *) &rxinfo[1];
+
+ //process only if it is an broadcast or for this computer both with the gnunet bssid
+
+ //check for bssid
+ if (memcmp(&(wlanIeeeHeader->i_addr3), &mac_bssid,
+ sizeof(struct MacAddress)) == 0)
+ {
+ //check for broadcast or mac
+ if (memcmp(&(wlanIeeeHeader->i_addr1), &bc_all_mac,
+ sizeof(struct MacAddress) == 0) || memcmp(
+ &(wlanIeeeHeader->i_addr1), &(plugin->mac_address),
+ sizeof(struct MacAddress)) == 0)
+ {
+
+ // process the inner data
+
+
+ datasize = ntohs(hdr->size) - sizeof(struct ieee80211_frame)
+ - sizeof(struct GNUNET_MessageHeader)
+ - sizeof(struct Radiotap_rx);
+
+ session_light = GNUNET_malloc(sizeof(struct Session_light));
+ memcpy(&session_light->addr, &(wlanIeeeHeader->i_addr2),
+ sizeof(struct MacAddress));
+ //session_light->session = search_session(plugin,session_light->addr);
+
+ pos = 0;
+ while (pos < datasize)
+ {
+ temp_hdr = (struct GNUNET_MessageHeader *) &wlanIeeeHeader[1]
+ + pos;
+
+ wlan_data_helper(plugin, session_light, temp_hdr, rxinfo);
+ pos += ntohs(temp_hdr->size);
+
+ }
+
+ //clean up
+ GNUNET_free(session_light);
+ }
+ else
+ {
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Func wlan_process_helper got wrong MAC: %s\n", macprinter(
+ wlanIeeeHeader->i_addr1));
+#endif
+ }
+ }
+ else
+ {
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Func wlan_process_helper got wrong BSSID: %s\n", macprinter(
+ wlanIeeeHeader->i_addr2));
+#endif
+ }
+ break;
+ case GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL:
+ //TODO more control messages
+ //TODO use struct wlan_helper_control
+ if (ntohs(hdr->size) != sizeof(struct Wlan_Helper_Control_Message))
+ {
+ GNUNET_break (0);
+ /* FIXME: restart SUID process */
+ return;
+ }
+ memcpy(&plugin->mac_address, &hdr[1], sizeof(struct MacAddress));
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Received WLAN_HELPER_CONTROL message with transport of address %s\n",
+ wlan_plugin_address_to_string(cls, &plugin->mac_address,
+ sizeof(struct MacAddress)));
+#endif
+ plugin->env->notify_address(plugin->env->cls, "wlan", &plugin->mac_address,
+ sizeof(struct MacAddress), GNUNET_TIME_UNIT_FOREVER_REL);
+ break;
+ default:
+ GNUNET_break (0);
+ return;
+ }
+}
+
+/**
+ * We have been notified that wlan-helper has written something to stdout.
+ * Handle the output, then reschedule this function to be called again once
+ * more is available.
+ *
+ * @param cls the plugin handle
+ * @param tc the scheduling context
+ */
+static void
+wlan_plugin_helper_read(void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Plugin *plugin = cls;
+ plugin->server_read_task = GNUNET_SCHEDULER_NO_TASK;
+
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+
+ char mybuf[WLAN_MTU + sizeof(struct GNUNET_MessageHeader)];
+ ssize_t bytes;
+
+ bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, mybuf,
+ sizeof(mybuf));
+ if (bytes <= 0)
+ {
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ _("Finished reading from wlan-helper stdout with code: %d\n"),
+ bytes);
+#endif
+ return;
+ }
+ GNUNET_SERVER_mst_receive(plugin->suid_tokenizer, NULL, mybuf, bytes,
+ GNUNET_NO, GNUNET_NO);
+
+ GNUNET_assert(plugin->server_read_task == GNUNET_SCHEDULER_NO_TASK);
+ plugin->server_read_task = GNUNET_SCHEDULER_add_read_file(
+ GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdout_handle,
+ &wlan_plugin_helper_read, plugin);
+}
+
+/**
+ * Start the gnunet-wlan-helper process.
+ *
+ * @param plugin the transport plugin
+ * @param testmode should we use the dummy driver for testing?
+ * @return GNUNET_YES if process was started, GNUNET_SYSERR on error
+ */
+static int
+wlan_transport_start_wlan_helper(struct Plugin *plugin, int testmode)
+{
+ const char * filename = "gnunet-transport-wlan-helper";
+ plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES, GNUNET_NO, GNUNET_YES);
+ if (plugin->server_stdout == NULL)
+ return GNUNET_SYSERR;
+
+ plugin->server_stdin = GNUNET_DISK_pipe(GNUNET_YES, GNUNET_YES, GNUNET_NO);
+ if (plugin->server_stdin == NULL)
+ return GNUNET_SYSERR;
+
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Starting gnunet-wlan-helper process cmd: %s %s %i\n", filename,
+ plugin->interface, testmode);
+#endif
+ /* Start the server process */
+
+ plugin->server_proc = GNUNET_OS_start_process(plugin->server_stdin,
+ plugin->server_stdout, filename, filename, plugin->interface, ((testmode
+ == 1) ? "1" : (testmode == 2) ? "2" : "0"), NULL);
+ if (plugin->server_proc == NULL)
+ {
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Failed to start gnunet-wlan-helper process\n");
+#endif
+ return GNUNET_SYSERR;
+ }
-#if DEBUG_TCP_NAT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Starting gnunet-wlan-helper process cmd: %s %s\n", "gnunet-wlan-helper", plugin->interface);
-#endif
- /* Start the server process */
- plugin->server_pid = GNUNET_OS_start_process(plugin->server_stdin, plugin->server_stdout, "gnunet-transport-wlan-helper", "gnunet-transport-wlan-helper", plugin->interface, NULL);
- if (plugin->server_pid == GNUNET_SYSERR)
- {
-#if DEBUG_TCP_NAT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to start gnunet-wlan-helper process\n");
-#endif
- return GNUNET_SYSERR;
- }
/* Close the write end of the read pipe */
GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
/* Close the read end of the write pipe */
- GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
+ GNUNET_DISK_pipe_close_end(plugin->server_stdin, GNUNET_DISK_PIPE_END_READ);
+
+ plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout,
+ GNUNET_DISK_PIPE_END_READ);
+ plugin->server_stdin_handle = GNUNET_DISK_pipe_handle(plugin->server_stdin,
+ GNUNET_DISK_PIPE_END_WRITE);
+
+ GNUNET_assert(plugin->server_read_task == GNUNET_SCHEDULER_NO_TASK);
+
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Adding server_read_task for the wlan-helper\n");
+#endif
- plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
- plugin->server_stdin_handle = GNUNET_DISK_pipe_handle(plugin->server_stdin, GNUNET_DISK_PIPE_END_WRITE);
+ plugin->server_read_task = GNUNET_SCHEDULER_add_read_file(
+ GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdout_handle,
+ &wlan_plugin_helper_read, plugin);
- plugin->server_read_task =
- GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
- GNUNET_TIME_UNIT_FOREVER_REL,
- plugin->server_stdout_handle, &wlan_plugin_helper_read, plugin);
return GNUNET_YES;
}
+/**
+ * Exit point from the plugin.
+ * @param cls pointer to the api struct
+ */
+//FIXME cleanup
+void *
+libgnunet_plugin_transport_wlan_done(void *cls)
+{
+ struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
+ struct Plugin *plugin = api->cls;
+ struct Sessionqueue * queue = plugin->sessions;
+ struct Sessionqueue * queue_next;
+ struct FragmentMessage * fm;
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "libgnunet_plugin_transport_wlan_done started\n");
#endif
+ GNUNET_OS_process_close(plugin->server_proc);
+ GNUNET_DISK_pipe_close(plugin->server_stdout);
+ GNUNET_DISK_pipe_close(plugin->server_stdin);
+
+ GNUNET_assert (cls !=NULL);
+ //free sessions
+ while (queue != NULL)
+ {
+ queue_next = queue->next;
+ free_session(plugin, queue);
+ queue = queue_next;
+
+ }
+ if (plugin->server_write_delay_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel(plugin->server_write_delay_task);
+ plugin->server_write_delay_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (plugin->server_write_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel(plugin->server_write_task);
+ plugin->server_write_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (plugin->server_read_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel(plugin->server_read_task);
+ plugin->server_read_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+
+
+ if (plugin->suid_tokenizer != NULL)
+ GNUNET_SERVER_mst_destroy(plugin->suid_tokenizer);
+
+ if (plugin->data_tokenizer != NULL)
+ GNUNET_SERVER_mst_destroy(plugin->data_tokenizer);
+
+ if (plugin->fragment_tokenizer != NULL)
+ GNUNET_SERVER_mst_destroy(plugin->fragment_tokenizer);
+
+ fm = (struct FragmentMessage *) GNUNET_CONTAINER_heap_peek(
+ plugin->pending_Fragment_Messages);
+
+ while (fm != NULL)
+ {
+ free_fragment_message(plugin, fm);
+ fm = (struct FragmentMessage *) GNUNET_CONTAINER_heap_peek(
+ plugin->pending_Fragment_Messages);
+ }
+
+ GNUNET_free_non_null(plugin->interface);
+ GNUNET_CONTAINER_heap_destroy(plugin->pending_Fragment_Messages);
+ GNUNET_free (plugin);
+ GNUNET_free (api);
+ return NULL;
+}
+
/**
* Entry point for the plugin.
+ *
+ * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
+ * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
*/
void *
-gnunet_plugin_transport_wlan_init (void *cls)
+libgnunet_plugin_transport_wlan_init(void *cls)
{
+ //struct GNUNET_SERVICE_Context *service;
struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
struct GNUNET_TRANSPORT_PluginFunctions *api;
struct Plugin *plugin;
+ static unsigned long long testmode = 0;
GNUNET_assert(cls !=NULL);
plugin = GNUNET_malloc (sizeof (struct Plugin));
plugin->env = env;
+ plugin->pendingsessions = 0;
+ plugin->session_count = 0;
+ plugin->server_write_task = GNUNET_SCHEDULER_NO_TASK;
+ plugin->server_read_task = GNUNET_SCHEDULER_NO_TASK;
+ plugin->server_write_delay_task = GNUNET_SCHEDULER_NO_TASK;
+ plugin->pending_Fragment_Messages = GNUNET_CONTAINER_heap_create(
+ GNUNET_CONTAINER_HEAP_ORDER_MIN);
+
+ plugin->suid_tokenizer = GNUNET_SERVER_mst_create(&wlan_process_helper,
+ plugin);
+ plugin->data_tokenizer = GNUNET_SERVER_mst_create(&process_data, plugin);
+ plugin->fragment_tokenizer = GNUNET_SERVER_mst_create(
+ &wlan_data_message_handler, plugin);
+
+ //plugin->sessions = GNUNET_malloc (sizeof (struct Sessionqueue));
+ //plugin->pending_Sessions_head = GNUNET_malloc (sizeof (struct Sessionqueue));
api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
api->cls = plugin;
api->check_address = &wlan_plugin_address_suggested;
api->address_to_string = &wlan_plugin_address_to_string;
- return api;
-}
+ //read config
+ if (GNUNET_CONFIGURATION_have_value(env->cfg, "transport-wlan", "TESTMODE"))
+ {
+ if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number(env->cfg,
+ "transport-wlan", "TESTMODE", &testmode))
+ testmode = 0; //default value
+ }
-/**
- * Exit point from the plugin.
- */
-void *
-gnunet_plugin_transport_wlan_done (void *cls)
-{
- struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
- struct Plugin *plugin = api->cls;
+ if (GNUNET_CONFIGURATION_have_value(env->cfg, "transport-wlan", "INTERFACE"))
+ {
+ if (GNUNET_CONFIGURATION_get_value_string(env->cfg, "transport-wlan",
+ "INTERFACE", &(plugin->interface)) != GNUNET_YES)
+ {
+ libgnunet_plugin_transport_wlan_done(api);
+ return NULL;
+ }
+ }
- GNUNET_assert(cls !=NULL);
+ //start the plugin
+ set_next_beacon_time(plugin);
- GNUNET_free (plugin);
- GNUNET_free (api);
- return NULL;
+ wlan_transport_start_wlan_helper(plugin, testmode);
+
+#if DEBUG_wlan
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "wlan init finished\n");
+#endif
+
+ return api;
}
/* end of plugin_transport_wlan.c */
projects / oweals / gnunet.git / blobdiff