/**
* @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_connection_lib.h"
-#include "gnunet_server_lib.h"
-#include "gnunet_service_lib.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"
#define PROTOCOL_PREFIX "wlan"
-#define DEBUG_wlan GNUNET_NO
+/**
+ * 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 DEBUG_wlan GNUNET_YES
+
+#define MESSAGE_LENGHT_UNKNOWN -1
+#define NO_MESSAGE_OR_MESSAGE_FINISHED -2
-static void
-wlan_plugin_helper_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
/**
* After how long do we expire an address that we
*/
#define LEARNED_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 6)
+/**
+ * Initial handshake message for a session.
+ */
+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;
+
+};
+
/**
* Encapsulation of all of the state of the plugin.
*/
-struct Plugin;
+struct Plugin
+{
+ /**
+ * Our environment.
+ */
+ struct GNUNET_TRANSPORT_PluginEnvironment *env;
+
+ /**
+ * List of open sessions. head
+ */
+ struct Sessionqueue *sessions;
+
+ /**
+ * List of open sessions. tail
+ */
+ struct Sessionqueue *sessions_tail;
+
+ /**
+ * Number of sessions
+ */
+
+ int session_count;
+
+ /**
+ * encapsulation to the local wlan server prog
+ */
+
+ struct GNUNET_SERVER_MessageStreamTokenizer * consoltoken;
+
+
+ /**
+ * stdout pipe handle for the gnunet-wlan-helper process
+ */
+ struct GNUNET_DISK_PipeHandle *server_stdout;
+
+ /**
+ * stdout file handle for the gnunet-wlan-helper process
+ */
+ const struct GNUNET_DISK_FileHandle *server_stdout_handle;
+
+ /**
+ * stdin pipe handle for the gnunet-wlan-helper process
+ */
+ struct GNUNET_DISK_PipeHandle *server_stdin;
+
+ /**
+ * stdin file handle for the gnunet-wlan-helper process
+ */
+ const struct GNUNET_DISK_FileHandle *server_stdin_handle;
+
+ /**
+ * ID of the gnunet-wlan-server std read task
+ */
+ GNUNET_SCHEDULER_TaskIdentifier server_read_task;
+
+ /**
+ * ID of the gnunet-wlan-server std read task
+ */
+ GNUNET_SCHEDULER_TaskIdentifier server_write_task;
+
+ /**
+ * ID of the delay task for writing
+ */
+ GNUNET_SCHEDULER_TaskIdentifier server_write_delay_task;
+
+ /**
+ * The process id of the wlan process
+ */
+ struct GNUNET_OS_Process *server_proc;
+
+ /**
+ * The interface of the wlan card given to us by the user.
+ */
+ char *interface;
+ /**
+ * The mac_address of the wlan card given to us by the helper.
+ */
+ struct MacAddress mac_address;
+
+ /**
+ * Sessions currently pending for transmission
+ * to this peer, if any.
+ */
+ struct Sessionqueue * pending_Sessions;
+
+ /**
+ * Sessions currently pending for transmission
+ * to this peer (tail), if any.
+ */
+ struct Sessionqueue * pending_Sessions_tail;
+
+ /**
+ * number of pending sessions
+ */
+ unsigned int pendingsessions;
+
+ /**
+ * Messages in the fragmentation queue, head
+ */
+
+ struct FragmentMessage * pending_Fragment_Messages_head;
+
+ /**
+ * Messages in the fragmentation queue, tail
+ */
+
+ struct FragmentMessage * pending_Fragment_Messages_tail;
+
+ /**
+ * number of pending fragment message
+ */
+
+ unsigned int pending_fragment_messages;
+
+ /**
+ * time of the next "hello-beacon"
+ */
+
+ struct GNUNET_TIME_Absolute beacon_time;
+
+};
+
+/**
+ * Queue of sessions, for the general session queue and the pending session queue
+ */
+
+struct Sessionqueue
+{
+ struct Sessionqueue * next;
+ struct Sessionqueue * prev;
+ struct Session * content;
+};
+
+/**
+ * Queue of ack received for messages send
+ */
+
+struct AckQueue
+{
+ struct AckQueue * next;
+ struct AckQueue * prev;
+ int fragment_num; //TODO change it to offset if better
+};
+
+
+
+/**
+ * Queue for the fragments received
+ */
+
+struct RecQueue
+{
+ struct RecQueue * next;
+ struct RecQueue * prev;
+ uint16_t num;
+ const char * msg;
+ uint16_t size;
+};
+
+/**
+ * Information kept for each message that is yet to
+ * be transmitted.
+ */
+struct PendingMessage
+{
+
+ /**
+ * The pending message
+ */
+ char *msg;
+
+ /**
+ * 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;
+
+ /**
+ * Cls for transmit_cont
+ */
+ void * transmit_cont_cls;
+
+ /**
+ * Timeout value for the pending message.
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+ /**
+ * Size of the message
+ */
+ size_t message_size;
+
+};
+
+/**
+ * Session infos gathered from a messages
+ */
+
+struct Session_light
+{
+ /**
+ * the session this message belongs to
+ */
+ struct Session * session;
+ /**
+ * peer mac address
+ */
+ uint8_t addr[6];
+};
/**
* Session handle for connections.
{
/**
- * Stored in a linked list.
+ * API requirement.
*/
- struct Session *next;
+ struct SessionHeader header;
/**
* Pointer to the global plugin struct.
*/
struct Plugin *plugin;
- /**
- * The client (used to identify this connection)
- */
- /* void *client; */
+ /**
+ * Message currently pending for transmission
+ * to this peer, if any.
+ */
+ struct PendingMessage *pending_message;
+
+ /**
+ * To whom are we talking to (set to our identity
+ * if we are still waiting for the welcome message)
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /**
+ * encapsulation of the receive data
+ */
+ //struct GNUNET_SERVER_MessageStreamTokenizer * receive_token;
+
+ /**
+ * offset of the next fragment for the receive_token, -1 means last message finished
+ */
+
+ //int rec_offset;
+
+ /**
+ * 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 RecQueue * frag_head;
+
+ /**
+ * Sorted queue with the fragments received; tail
+ */
+
+ struct RecQueue * frag_tail;
+
+ /**
+ * peer mac address
+ */
+ char addr[6];
+
+ /**
+ * 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;
+
+ /**
+ * current number for message incoming, to distinguish between the messages
+ */
+ uint32_t message_id_in;
+
+ /**
+ * current number for message outgoing, to distinguish between the messages
+ */
+ uint32_t message_id_out;
+
+ /**
+ * does this session have a message in the fragment queue
+ */
+
+ int has_fragment;
+
+};
+
+
+
+
+struct FragmentMessage
+{
+ /**
+ * 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;
+
+ /**
+ * 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;
+
+ /**
+ * Sorted queue with the acks received for fragments; head
+ */
+
+ struct AckQueue * head;
+
+ /**
+ * Sorted queue with the acks received for fragments; tail
+ */
+
+ struct AckQueue * tail;
+
+ /**
+ * 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;
+
+};
+
+/**
+ * Header for messages which need fragmentation
+ */
+struct WlanHeader
+{
+
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * checksum/error correction
+ */
+ uint32_t crc GNUNET_PACKED;
+
+ /**
+ * To whom are we talking to (set to our identity
+ * if we are still waiting for the welcome message)
+ */
+ struct GNUNET_PeerIdentity target;
+
+ // followed by payload
+
+};
+
+/**
+ * Header for messages which need fragmentation
+ */
+struct FragmentationHeader
+{
+
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * To whom are we talking to (set to our identity
+ * if we are still waiting for the welcome message)
+ */
+ // struct GNUNET_PeerIdentity target GNUNET_PACKED;
+
+ /**
+ * 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)
+ */
+ uint16_t fragment_off_or_num GNUNET_PACKED;
+
+ /**
+ * CRC of fragment (for error checking)
+ */
+ uint16_t message_crc GNUNET_PACKED;
+
+ /**
+ * Flags
+ * // 0x1 ack => Use two different message types in header.type! (FRAG_MESSAGE; FRAG_ACK)
+ * // 0x2 has data (not only ack)
+ * // 0x4 last fragment of message
+ * // 0x8 new message
+ */
+ // uint32_t flags GNUNET_PACKED;
+
+ /**
+ * checksum/error correction
+ */
+ // uint32_t crc GNUNET_PACKED;
+
+ // followed by payload unless ACK
+
+};
+
+//enum { ACK_FRAGMENT = 1, DATA_FRAGMENT = 2, LAST_FRAGMENT = 4, NEW_MESSAGE = 8 };
+
+int
+getRadiotapHeader(struct RadiotapHeader * Header);
+
+int
+getWlanHeader(struct IeeeHeader * Header);
+
+static int
+wlan_plugin_address_suggested(void *cls, const void *addr, size_t addrlen);
+
+uint16_t
+getcrc16(const char *msgbuf, size_t msgbuf_size);
+
+static void
+do_transmit(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+static void
+check_fragment_queue(struct Plugin * plugin);
+
+uint32_t
+getcrc32(const char *msgbuf, size_t msgbuf_size);
+
+static void
+free_rec_frag_queue(struct Session * session);
+
+static void
+wlan_data_helper(void *cls, void * client, const struct GNUNET_MessageHeader * hdr);
+
+static void
+wlan_process_helper (void *cls,
+ void *client,
+ const struct GNUNET_MessageHeader *hdr);
+
+/**
+ * get the next message number, at the moment just a random one
+ *
+ */
+//TODO doxigen
+uint32_t
+get_next_message_id()
+{
+ return GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
+}
+
+/**
+ * start next message number generator
+ */
+//TODO doxigen
+void
+start_next_message_id()
+{
+ //GNUNET_CRYPTO_random_init;
+}
+
+/**
+ * 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 uint8_t * addr)
+{
+ struct Sessionqueue * queue = plugin->sessions;
+ struct Sessionqueue * lastitem = NULL;
+
+ //just look at all the session for the needed one
+ while (queue != NULL)
+ {
+ // content is never NULL
+ GNUNET_assert (queue->content != NULL);
+ char * addr2 = queue->content->addr;
+ if (memcmp(addr, addr2, 6) == 0)
+ {
+ //sesion found
+ return queue->content;
+ }
+ // try next
+ lastitem = queue;
+ queue = queue->next;
+ }
+ return NULL;
+}
+
+/**
+ * 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 uint8_t * 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;
+ memcpy(queue->content->addr, addr, 6);
+ queue->content->message_id_out = get_next_message_id();
+ queue->content->has_fragment = 0;
+ queue->content->rec_size = NO_MESSAGE_OR_MESSAGE_FINISHED;
+
+ plugin->session_count++;
+ 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
+ */
+//TODO add other possibilities to find the right session (are there other?)
+static struct Session *
+get_Session(struct Plugin *plugin, const uint8_t * addr)
+{
+ struct Session * session = search_session(plugin, addr);
+ if (session != NULL)
+ {
+ return session;
+ }
+ // new session
+ return create_session(plugin, addr);
+
+ /* -- not needed, layer above already has it--
+ //queue welcome message for new sessions, not realy needed
+ //struct WelcomeMessage welcome;
+ struct PendingMessage *pm;
+ pm = GNUNET_malloc (sizeof (struct PendingMessage));
+ pm->msg = GNUNET_malloc(GNUNET_HELLO_size(* (plugin->env->our_hello)));
+ pm->message_size = GNUNET_HELLO_size(* (plugin->env->our_hello));
+ //welcome.header.size = htons (GNUNET_HELLO_size(* (plugin->env->our_hello)));
+ //welcome.header.type = htons (GNUNET_MESSAGE_TYPE_WLAN_ADVERTISEMENT);
+ //welcome.clientIdentity = *plugin->env->my_identity;
+ memcpy ( (pm->msg), * plugin->env->our_hello, GNUNET_HELLO_size(* (plugin->env->our_hello)));
+ pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
+ queue->content->pending_message = pm;
+ plugin->pendingsessions ++;
+ GNUNET_CONTAINER_DLL_insert_tail(plugin->pending_Sessions, plugin->pending_Sessions_tail, queue);
+
+ check_fragment_queue(plugin);
+ */
+}
+
+/**
+ * Queue the session to send data
+ */
+//TODO doxigen
+static void
+queue_Session (struct Plugin *plugin,
+ struct Session * session)
+{
+ struct Sessionqueue * queue = plugin->pending_Sessions;
+ struct Sessionqueue * lastitem = 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
+ lastitem = queue;
+ 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_after (plugin->pending_Sessions,
+ plugin->pending_Sessions_tail,
+ plugin->pending_Sessions_tail, queue);
+ plugin->pendingsessions ++;
+
+}
+
+//TODO doxigen
+static void
+free_acks (struct FragmentMessage * fm){
+ struct AckQueue * fq;
+ while (fm->head != NULL){
+ fq = fm->head;
+ GNUNET_CONTAINER_DLL_remove(fm->head, fm->tail, fq);
+ GNUNET_free(fq);
+ }
+ //needed?
+ fm->head = NULL;
+ fm->tail = NULL;
+}
+
+//TODO doxigen
+/**
+ * Function to schedule the write task, executed after a delay
+ */
+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 (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);
+ }
+}
+
+//TODO doxigen
+/**
+ * Function to calculate the time of the next periodic "hello-beacon"
+ */
+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_UNIT_SECONDS);
+ }
+ //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));
+ }
+ //over 30 known peers: once a minute
+ else
+ {
+ plugin->beacon_time = GNUNET_TIME_absolute_add(
+ GNUNET_TIME_absolute_get(), GNUNET_TIME_UNIT_MINUTES);
+ }
+}
+
+
+//TODO doxigen
+struct GNUNET_TIME_Relative
+get_next_frag_timeout(struct FragmentMessage * fm)
+{
+ return GNUNET_TIME_relative_min(GNUNET_TIME_absolute_get_remaining(
+ fm->next_ack), GNUNET_TIME_absolute_get_remaining(fm->timeout));
+}
+
+//TODO doxigen
+/**
+ * Function to get the timeout value for acks for this session
+ */
+
+struct GNUNET_TIME_Relative
+get_ack_timeout (struct FragmentMessage * fm){
+ return FRAGMENT_TIMEOUT;
+}
+
+//TODO doxigen
+/**
+ * Function to set the timer for the next timeout of the fragment queue
+ */
+static void
+check_next_fragment_timeout(struct Plugin * const plugin)
+{
+ struct FragmentMessage * fm;
+ struct GNUNET_TIME_Relative next_send;
+
+ next_send = GNUNET_TIME_absolute_get_remaining(plugin->beacon_time);
+
+ //cancel old task
+ if (plugin->server_write_delay_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel(plugin->server_write_delay_task);
+ }
+ fm = plugin->pending_Fragment_Messages_head;
+
+ GNUNET_assert(plugin->server_write_delay_task == GNUNET_SCHEDULER_NO_TASK);
+
+ //check if there are some fragments in the queue
+ if (fm != NULL)
+ {
+ next_send
+ = GNUNET_TIME_relative_min(next_send, get_next_frag_timeout(fm));
+ }
+ plugin->server_write_delay_task = GNUNET_SCHEDULER_add_delayed(next_send,
+ &delay_fragment_task, plugin);
+}
+
+
+
+//TODO doxigen
+/**
+ * Function to get the next queued Session, removes the session from 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;
+ while (sessionqueue != NULL){
+ session = sessionqueue->content;
+ pm = session->pending_message;
+
+ //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->has_fragment){
+ plugin->pendingsessions --;
+ GNUNET_CONTAINER_DLL_remove (plugin->pending_Sessions,
+ plugin->pending_Sessions_tail, sessionqueue);
+ GNUNET_free(sessionqueue);
+
+ return session;
+ } else {
+ sessionqueue = sessionqueue->next;
+ }
+ } else {
+
+ session->pending_message = 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);
+
+ sessionqueue_alt = sessionqueue;
+ sessionqueue = sessionqueue->next;
+ plugin->pendingsessions --;
+ GNUNET_CONTAINER_DLL_remove (plugin->pending_Sessions,
+ plugin->pending_Sessions_tail, sessionqueue_alt);
+
+ GNUNET_free(sessionqueue_alt);
+
+ }
+
+
+ }
+ return NULL;
+}
+
+//TODO doxigen
+/**
+ * Function to sort the message into the message fragment queue
+ */
+static void
+sort_fragment_into_queue (struct Plugin * plugin, struct FragmentMessage * fm){
+ struct FragmentMessage * fm2;
+ //sort into the list at the right position
+
+ fm2 = plugin->pending_Fragment_Messages_head;
+
+ while (fm2 != NULL){
+ if (GNUNET_TIME_absolute_get_difference(fm2->next_ack, fm->next_ack).rel_value == 0){
+ break;
+ } else {
+ fm2 = fm2->next;
+ }
+ }
+
+ GNUNET_CONTAINER_DLL_insert_after(plugin->pending_Fragment_Messages_head,
+ plugin->pending_Fragment_Messages_tail,fm2,fm);
+}
+
+//TODO doxigen
+static void
+free_fragment_message(struct Plugin * plugin,struct FragmentMessage * fm)
+{
+ if (fm != NULL)
+ {
+ free_acks(fm);
+ GNUNET_free_non_null(fm->msg);
+ GNUNET_CONTAINER_DLL_remove (plugin->pending_Fragment_Messages_head,
+ plugin->pending_Fragment_Messages_tail, fm);
+ GNUNET_free(fm);
+ plugin->pending_fragment_messages --;
+ check_fragment_queue(plugin);
+ }
+}
+
+//TODO doxigen
+/**
+ * Function to check if there is some space in the fragment queue
+ */
+
+static void
+check_fragment_queue (struct Plugin * plugin){
+ struct Session * session;
+ struct FragmentMessage * fm;
+
+ struct PendingMessage * pm;
+
+ if (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->has_fragment = 1;
+ 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();
+
+ if (pm->transmit_cont != NULL)
+ pm->transmit_cont (pm->transmit_cont_cls,
+ &(session->target), GNUNET_OK);
+ GNUNET_free(pm);
+
+ sort_fragment_into_queue(plugin,fm);
+ plugin->pending_fragment_messages ++;
+
+ //generate new message id
+ session->message_id_out = get_next_message_id();
+
+ //check if timeout changed
+ check_next_fragment_timeout(plugin);
+ }
+ }
+}
+
+//TODO doxigen
+static void
+check_finished_fragment(struct Plugin * plugin, struct FragmentMessage * fm){
+ struct AckQueue * ack;
+ int counter = 0;
+
+ if (fm->message_size >= (WLAN_MTU - sizeof(struct FragmentationHeader))
+ * fm->tail->fragment_num)
+ {
+ ack = fm->head;
+ counter = 0;
+ //check if all acks are present
+ while (ack != NULL)
+ {
+ if (counter == ack->fragment_num)
+ {
+ counter ++;
+ ack = ack->next;
+ } else {
+ //ack is missing
+ return;
+ }
+ }
+ fm->session->has_fragment = 0;
+ free_fragment_message(plugin, fm);
+
+
+ }
+}
+
+/**
+ * Function called to 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;
- /**
- * Continuation function to call once the transmission buffer
- * has again space available. NULL if there is no
- * continuation to call.
- */
- GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
+ ssize_t bytes;
- /**
- * Closure for transmit_cont.
- */
- void *transmit_cont_cls;
+ if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
+ return;
- /**
- * To whom are we talking to (set to our identity
- * if we are still waiting for the welcome message)
- */
- struct GNUNET_PeerIdentity sender;
+ struct Session * session = NULL;
+ struct FragmentMessage * fm = NULL;
+ struct IeeeHeader * ieeewlanheader = NULL;
+ struct RadiotapHeader * radioHeader = NULL;
+ struct GNUNET_MessageHeader * msgheader = NULL;
+ struct GNUNET_MessageHeader * msgheader2 = NULL;
+ struct FragmentationHeader fragheader;
+ struct FragmentationHeader * fragheaderptr = NULL;
+ uint16_t size = 0;
+ const char * copystart = NULL;
+ uint16_t copysize = 0;
+ uint copyoffset = 0;
+ struct AckQueue * akt = NULL;
+
+ //test if a "hello-beacon" has to be send
+ if (GNUNET_TIME_absolute_get_remaining(plugin->beacon_time).rel_value == 0)
+ {
+ //check if the message is not to big
+ GNUNET_assert(sizeof(struct WlanHeader) + GNUNET_HELLO_size(
+ *(plugin->env->our_hello)) <= WLAN_MTU);
+ size = sizeof(struct GNUNET_MessageHeader)
+ + sizeof(struct RadiotapHeader) + sizeof(struct IeeeHeader)
+ + sizeof(struct GNUNET_MessageHeader) + GNUNET_HELLO_size(
+ *(plugin->env->our_hello));
- /**
- * At what time did we reset last_received last?
- */
- struct GNUNET_TIME_Absolute last_quota_update;
+ msgheader = GNUNET_malloc(size);
+ msgheader->size = htons(size);
+ msgheader->type = htons(GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA);
- /**
- * How many bytes have we received since the "last_quota_update"
- * timestamp?
- */
- uint64_t last_received;
+ radioHeader = (struct RadiotapHeader *) &msgheader[1];
+ getRadiotapHeader(radioHeader);
- /**
- * Number of bytes per ms that this peer is allowed
- * to send to us.
- */
- uint32_t quota;
+ ieeewlanheader = (struct IeeeHeader *) &radioHeader[1];
+ getWlanHeader(ieeewlanheader);
-};
+ 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);
-/**
- * Encapsulation of all of the state of the plugin.
- */
-struct Plugin
-{
- /**
- * Our environment.
- */
- struct GNUNET_TRANSPORT_PluginEnvironment *env;
+ memcpy(&msgheader2[1], *plugin->env->our_hello, GNUNET_HELLO_size(
+ *(plugin->env->our_hello)));
- /**
- * List of open sessions.
- * TODO?
- */
- struct Session *sessions;
- /**
- * encapsulation to the local wlan server prog
- */
+ bytes = GNUNET_DISK_file_write(plugin->server_stdin_handle, msgheader,
+ size);
+ GNUNET_assert(bytes == size);
- struct GNUNET_SERVER_MessageStreamTokenizer * consoltoken;
+ set_next_beacon_time(plugin);
+ check_next_fragment_timeout(plugin);
+ return;
- /**
- * encapsulation of the data
- */
+ }
- struct GNUNET_SERVER_MessageStreamTokenizer * datatoken;
- /**
- * stdout pipe handle for the gnunet-wlan-helper process
- */
- struct GNUNET_DISK_PipeHandle *server_stdout;
+ fm = plugin->pending_Fragment_Messages_head;
+ GNUNET_assert(fm != NULL);
+ session = fm->session;
+ GNUNET_assert(session != NULL);
- /**
- * stdout file handle for the gnunet-wlan-helper process
- */
- const struct GNUNET_DISK_FileHandle *server_stdout_handle;
+ // test if message timed out
+ if (GNUNET_TIME_absolute_get_remaining(fm->timeout).rel_value == 0){
+ free_acks(fm);
+ GNUNET_assert(plugin->pending_fragment_messages > 0);
+ plugin->pending_fragment_messages --;
+ GNUNET_CONTAINER_DLL_remove(plugin->pending_Fragment_Messages_head,
+ plugin->pending_Fragment_Messages_tail, fm);
- /**
- * stdin pipe handle for the gnunet-wlan-helper process
- */
- struct GNUNET_DISK_PipeHandle *server_stdin;
+ GNUNET_free(fm->msg);
- /**
- * stdin file handle for the gnunet-wlan-helper process
- */
- const struct GNUNET_DISK_FileHandle *server_stdin_handle;
+ GNUNET_free(fm);
+ check_fragment_queue(plugin);
+ } else {
- /**
- * ID of select gnunet-nat-server std read task
- */
- GNUNET_SCHEDULER_TaskIdentifier server_read_task;
+ if (fm->message_size > WLAN_MTU) {
+ size += sizeof(struct FragmentationHeader);
+ // check/set for retransmission
+ if (GNUNET_TIME_absolute_get_duration(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
+ akt = fm->head;
+ fm->message_pos = 0;
+
+ //test if ack 0 was already received
+ while (akt != NULL){
+ //if fragment is present, take next
+ if (akt->fragment_num == fm->message_pos) {
+ fm->message_pos ++;
+ }
+ //next ack is bigger then the fragment number
+ //in case there is something like this: (acks) 1, 2, 5, 6, ...
+ //and we send 3 again, the next number should be 4
+ else if (akt->fragment_num > fm->message_pos) {
+ break;
+ }
+
+ akt = akt->next;
+
+ }
+
+
+ }
+
+ copyoffset = (WLAN_MTU - sizeof(struct FragmentationHeader)) * fm->message_pos;
+ fragheader.fragment_off_or_num = htons(fm->message_pos);
+ fragheader.message_id = htonl(session->message_id_out);
+
+ // start should be smaller then the packet size
+ GNUNET_assert(copyoffset < fm->message_size);
+ copystart = fm->msg + copyoffset;
+
+ //size of the fragment is either the MTU - overhead
+ //or the missing part of the message in case this is the last fragment
+ copysize = GNUNET_MIN(fm->message_size - copyoffset,
+ WLAN_MTU - sizeof(struct FragmentationHeader));
+ fragheader.header.size = htons(copysize + sizeof(struct FragmentationHeader));
+ fragheader.header.type = htons(GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT);
+
+
+ //get the next missing fragment
+ akt = fm->head;
+ fm->message_pos ++;
+
+ //test if ack was already received
+ while (akt != NULL){
+ //if fragment is present, take next
+ if (akt->fragment_num == fm->message_pos) {
+ fm->message_pos ++;
+ }
+ //next ack is bigger then the fragment number
+ //in case there is something like this: (acks) 1, 2, 5, 6, ...
+ //and we send 3 again, the next number should be 4
+ else if (akt->fragment_num > fm->message_pos) {
+ break;
+ }
+
+ akt = akt->next;
+ }
+ } else {
+ // there is no need to split
+ copystart = fm->msg;
+ copysize = fm->message_size;
+ }
+
+ size += copysize;
+ size += sizeof(struct RadiotapHeader) + sizeof(struct IeeeHeader)
+ + sizeof(struct GNUNET_MessageHeader);
+ msgheader = GNUNET_malloc(size);
+ msgheader->size = htons(size);
+ msgheader->type = htons(GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA);
+
+ radioHeader = (struct RadiotapHeader*) &msgheader[1];
+ getRadiotapHeader(radioHeader);
+
+ ieeewlanheader = (struct IeeeHeader *) &radioHeader[1];
+ getWlanHeader(ieeewlanheader);
+
+
+ //could be faster if content is just send and not copyed before
+ //fragmentheader is needed
+ if (fm->message_size > WLAN_MTU){
+ fragheader.message_crc = htons(getcrc16(copystart, copysize));
+ memcpy(&ieeewlanheader[1],&fragheader, sizeof(struct FragmentationHeader));
+ fragheaderptr = (struct FragmentationHeader *) &ieeewlanheader[1];
+ memcpy(&fragheaderptr[1],copystart,copysize);
+ } else {
+ memcpy(&ieeewlanheader[1],copystart,copysize);
+ }
+
+ bytes = GNUNET_DISK_file_write(plugin->server_stdin_handle, msgheader, size);
+ GNUNET_assert(bytes == size);
+
+ //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_DLL_remove (plugin->pending_Fragment_Messages_head,
+ plugin->pending_Fragment_Messages_tail, fm);
+
+ GNUNET_CONTAINER_DLL_insert_tail(plugin->pending_Fragment_Messages_head,
+ plugin->pending_Fragment_Messages_tail, fm);
+ // if fragments have opimized timeouts
+ //sort_fragment_into_queue(plugin,fm);
+
+ }
+ check_next_fragment_timeout(plugin);
- /**
- * The process id of the server process (if behind NAT)
- */
- pid_t server_pid;
+ }
+}
- /**
- * The interface of the wlan card given to us by the user.
- */
- char *interface;
- /**
- * The mac_address of the wlan card given to us by the helper.
- */
- char *mac_address;
+/**
+ * 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
+ */
-struct Plugin* plugin;
+uint16_t
+getcrc16 (const char *msgbuf,
+ size_t msgbuf_size){
+ //TODO calc some crc
+ return 0;
+}
/**
* Function that can be used by the transport service to transmit
*/
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)
+ 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)
{
- int bytes_sent = 0;
- /* struct Plugin *plugin = cls; */
- return bytes_sent;
-}
+ struct Plugin * plugin = cls;
+ struct PendingMessage * newmsg = NULL;
+ struct WlanHeader * wlanheader = NULL;
+ //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
+ session->target = *target;
+
+ //queue message:
+ //first queue session
+ queue_Session(plugin, session);
+
+ //queue message in session
+ //test if there is no other message in the "queue"
+ GNUNET_assert (session->pending_message == NULL);
+
+ 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->message_size = msgbuf_size + sizeof(struct WlanHeader);
+
+ session->pending_message = newmsg;
+
+ check_fragment_queue(plugin);
+ //FIXME not the correct size
+ return msgbuf_size;
+}
+
+//TODO doxigen
+static struct FragmentMessage *
+get_fragment_message_from_session(struct Session * session)
+{
+ struct FragmentMessage * fm = session->plugin->pending_Fragment_Messages_head;
+ while (fm != NULL)
+ {
+ if (fm->session == session)
+ {
+ return fm;
+ }
+ fm = fm->next;
+ }
+ return NULL;
+}
/**
* Function that can be used to force the plugin to disconnect
* from the given peer and cancel all previous transmissions
- * (and their continuationc).
+ * (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)
+wlan_plugin_disconnect(void *cls, const struct GNUNET_PeerIdentity *target)
{
- // struct Plugin *plugin = cls;
- // FIXME
+ struct Plugin *plugin = cls;
+ struct Sessionqueue * queue = plugin->sessions;
+ struct Sessionqueue * pendingsession = plugin->pending_Sessions;
+ struct PendingMessage * pm = NULL;
+ struct FragmentMessage * fm;
+
+ // 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)
+ {
+ //session found
+ //is this session pending for send
+ while (pendingsession != NULL)
+ {
+ if (pendingsession->content == queue->content)
+ {
+ plugin->pendingsessions --;
+ GNUNET_CONTAINER_DLL_remove (plugin->pending_Sessions,
+ plugin->pending_Sessions_tail, pendingsession);
+ GNUNET_free(pendingsession);
+ break;
+ }
+ pendingsession = pendingsession->next;
+ }
+
+ //is something of this session in the fragment queue?
+ fm = get_fragment_message_from_session(queue->content);
+ free_fragment_message(plugin,fm);
+
+ //dispose all received fragments
+ free_rec_frag_queue(queue->content);
+
+ // remove PendingMessage
+ pm = queue->content->pending_message;
+ GNUNET_free(pm->msg);
+ GNUNET_free(pm);
+
+ GNUNET_free(queue->content);
+ GNUNET_CONTAINER_DLL_remove(plugin->sessions, plugin->sessions_tail, queue);
+ GNUNET_free(queue);
+ plugin->session_count --;
+
+ return;
+ }
+ // try next
+ queue = queue->next;
+ }
}
*/
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)
-{
- unsigned int res;
- char * ret;
- char * input;
-
+ 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);
- //Mac Adress has 6 bytes
- if (addrlen == 6){
- input = addr;
- res = GNUNET_asprintf(&ret,"%s Mac-Adress %X:%X:%X:%X:%X:%X", PROTOCOL_PREFIX, input[0], input[1],input[2],input[3],input[4],input[5]);
-
- GNUNET_assert(res != 0);
- asc (asc_cls, ret);
- GNUNET_free_non_null (ret);
-
- } else {
- /* invalid address */
- GNUNET_break_op (0);
- asc (asc_cls, NULL);
- return;
- }
+ 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);
}
* @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; */
+ //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 Adress has 6 bytes
if (addrlen == 6){
/* TODO check for bad addresses like milticast, broadcast, etc */
return GNUNET_SYSERR;
}
+ return GNUNET_SYSERR;
}
*/
static const char*
wlan_plugin_address_to_string (void *cls,
- const void *addr,
- size_t addrlen)
+ const void *addr,
+ size_t addrlen)
{
- unsigned int res;
- char * ret;
- char * input;
-
+ char ret[92];
+ const unsigned char * input;
+
GNUNET_assert(cls !=NULL);
- //Mac Adress has 6 bytes
- if (addrlen == 6){
- input = addr;
- res = GNUNET_asprintf(&ret,"%X:%X:%X:%X:%X:%X", input[0], input[1],input[2],input[3],input[4],input[5]);
+ 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);
+}
- GNUNET_assert(res != 0);
- return ret;
+/**
+ * Function to test if fragment number already exists in the fragments received
+ */
+//TODO doxigen
+static const int
+is_double_msg(struct Session * session, struct FragmentationHeader * fh)
+{
+ struct RecQueue * rec_queue = session->frag_head;
+ while (rec_queue != NULL)
+ {
+ if (rec_queue->num == fh->fragment_off_or_num)
+ {
+ return GNUNET_YES;
+ }
+ rec_queue = rec_queue->next;
- } else {
- /* invalid address */
- GNUNET_break (0);
- return NULL;
- }
+ }
+ return GNUNET_NO;
}
+static void
+insert_fragment_in_queue(struct Session * session, struct RecQueue * rec_queue)
+{
+ struct RecQueue * rec_queue2 = session->frag_head;
+ struct WlanHeader * wlanheader = NULL;
+ //first received fragment of message
+ if (session->rec_size == NO_MESSAGE_OR_MESSAGE_FINISHED)
+ {
+ session->rec_size = MESSAGE_LENGHT_UNKNOWN;
+ }
+ //this is the first fragment of the message (fragment id 0)
+ if (rec_queue->num == 0)
+ {
+ wlanheader = (struct WlanHeader *) rec_queue->msg;
+ session->rec_size = wlanheader->header.size;
+ }
+
+ //sort into list
+ while (rec_queue2 != NULL)
+ {
+ if (rec_queue2->num > rec_queue->num)
+ {
+ //next element number is grater than the current num
+ GNUNET_CONTAINER_DLL_insert_before(session->frag_head, session->frag_tail, rec_queue2, rec_queue);
+ return;
+ }
+ rec_queue = rec_queue->next;
+ }
+ //no element has a grater number
+ GNUNET_CONTAINER_DLL_insert_tail(session->frag_head, session->frag_tail, rec_queue);
+}
+
/**
- * Function for used to process the data from the suid process
+ * Function to dispose the fragments received for a message
*/
+//TODO doxigen
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);
+free_rec_frag_queue(struct Session * session)
+{
+ struct RecQueue * rec_queue = session->frag_head;
+ struct RecQueue * rec_queue2;
+ while (rec_queue != NULL)
+ {
+ rec_queue2 = rec_queue;
+ rec_queue = rec_queue->next;
+ GNUNET_free(rec_queue2);
}
+ session->frag_head = NULL;
+ session->frag_tail = NULL;
+ session->rec_size = NO_MESSAGE_OR_MESSAGE_FINISHED;
+}
+/**
+ * Function to check if all fragments of a message have been received
+ */
+//TODO doxigen
+static void
+check_rec_finished_msg (struct Plugin* plugin, struct Session_light * session_light, struct Session * session){
+ struct RecQueue * rec_queue = session->frag_head;
+ int packetsize = session->rec_size;
+ int sum = 0;
+ int aktnum = 0;
+ char * msg;
+ //some fragment should be received
+ GNUNET_assert(session->rec_size != NO_MESSAGE_OR_MESSAGE_FINISHED);
+ //check if first fragment is present
+ if (session->rec_size == MESSAGE_LENGHT_UNKNOWN){
+ return;
+ }
+ while (rec_queue != NULL){
+ sum += rec_queue->size;
+ //check if all fragment numbers are present
+ if (rec_queue->num != aktnum){
+ return;
+ }
+ aktnum ++;
+ rec_queue = rec_queue->next;
+ }
+ //sum should always be smaller or equal of
+ GNUNET_assert(sum <= packetsize);
+ if (sum == packetsize){
+ //copy fragments together
+ msg = GNUNET_malloc(packetsize);
+ rec_queue = session->frag_head;
+ aktnum = 0;
+ while (rec_queue != NULL){
+ memcpy(msg + aktnum, rec_queue->msg, rec_queue->size);
+ aktnum += rec_queue->size;
+ rec_queue = rec_queue->next;
+ }
+ free_rec_frag_queue(session);
+ //call wlan_process_helper to process the message
+ wlan_data_helper (plugin, session_light, (struct GNUNET_MessageHeader*) msg);
- } else {
- // TODO Wrong data?
+ GNUNET_free(msg);
}
}
+static void
+wlan_data_helper(void *cls, void * client, const struct GNUNET_MessageHeader * hdr)
+{
+ struct Plugin *plugin = cls;
+ struct Session * session = NULL;
+ struct Session_light * session_light = NULL;
+
+ struct WlanHeader * wlanheader = NULL;
+ struct FragmentationHeader * fh = NULL;
+ struct FragmentMessage * fm = NULL;
+
+ const char * tempmsg = NULL;
+
+ struct AckQueue * ack = NULL;
+ struct AckQueue * ack2 = NULL;
+
+ struct RecQueue * rec_queue = NULL;
+ const struct GNUNET_MessageHeader * temp_hdr = NULL;
+
+ if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_ADVERTISEMENT)
+ {
+ //TODO better DOS protection, error handling
+ GNUNET_assert(client != NULL);
+ session_light = (struct Session_light *) client;
+ 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);
+
+ }
+
+
+ else if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_DATA)
+ {
+ GNUNET_assert(client != NULL);
+ session_light = (struct Session_light *) client;
+ if (session_light->session == NULL){
+ session_light->session = search_session(plugin, session_light->addr);
+ }
+ session = session_light->session;
+ wlanheader =(struct WlanHeader *) &hdr[1];
+ tempmsg = (char*) &wlanheader[1];
+ temp_hdr = ( const struct GNUNET_MessageHeader *) &wlanheader[1];
+
+ if (getcrc32(tempmsg, wlanheader->header.size) != wlanheader->crc){
+ //wrong crc, dispose message
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "WLAN message crc was wrong\n");
+ return;
+ }
+
+ //if not in session list
+ if (session == NULL){
+
+ //try if it is a hello message
+ if (ntohs(temp_hdr->type) == GNUNET_MESSAGE_TYPE_HELLO){
+ session = create_session(plugin, session_light->addr);
+ session_light->session = session;
+ GNUNET_assert(GNUNET_HELLO_get_id(
+ (const struct GNUNET_HELLO_Message *) temp_hdr,
+ &session->target ) != GNUNET_SYSERR);
+
+ } else {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "WLAN client not in session list and not a hello message\n");
+ return;
+ }
+ }
+ //"receive" the message
+ 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);
+ plugin->env->receive(plugin, &session->target,
+ temp_hdr, (const struct GNUNET_TRANSPORT_ATS_Information *) &distance, 2,
+ session, session->addr, sizeof(session->addr));
+ }
+
+ else if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT)
+ {
+ GNUNET_assert(client != NULL);
+ session_light = (struct Session_light *) client;
+ 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 not in session list
+ if (session != NULL)
+ {
+ if (getcrc16(tempmsg, fh->header.size) != fh->message_crc)
+ {
+ //wrong crc, dispose message
+ GNUNET_log(GNUNET_ERROR_TYPE_INFO,
+ "WLAN fragment crc was wrong\n");
+ return;
+ }
+ else
+ {
+ //todo fragments do not timeout
+ //check if message_id is rigth or it is a new msg
+ if ((session->message_id_in == ntohs(fh->message_id))
+ || (session->rec_size == NO_MESSAGE_OR_MESSAGE_FINISHED))
+ {
+ session->message_id_in = ntohs(fh->message_id);
+ if (is_double_msg(session, fh) != GNUNET_YES)
+ {
+ rec_queue = GNUNET_malloc(sizeof (struct RecQueue) +
+ ntohs(fh->header.size) - sizeof(struct FragmentationHeader));
+ rec_queue->size = ntohs(fh->header.size
+ - sizeof(struct FragmentationHeader));
+ rec_queue->num = ntohs(fh->fragment_off_or_num);
+ rec_queue->msg = (char*) &rec_queue[1];
+ //copy msg to buffer
+ memcpy((char*) rec_queue->msg, tempmsg, rec_queue->size);
+ insert_fragment_in_queue(session, rec_queue);
+ check_rec_finished_msg(plugin, session_light, session);
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_INFO,
+ "WLAN fragment is a clone\n");
+ return;
+ }
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_INFO,
+ "WLAN fragment message_id and session message_id are not the same and a message is already (partly) received\n");
+ return;
+ }
+ }
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
+ "WLAN client not in session list and it is a fragment message\n");
+ return;
+ }
+
+ }
+
+ else if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_FRAGMENT_ACK)
+ {
+ GNUNET_assert(client != NULL);
+ session_light = (struct Session_light *) client;
+ if (session_light->session == NULL)
+ {
+ session_light->session = search_session(plugin, session_light->addr);
+ GNUNET_assert(session_light->session != NULL);
+ }
+ session = session_light->session;
+ fh = (struct FragmentationHeader *) &hdr[1];
+ if (fh->message_id == session->message_id_out)
+ {
+ fm = get_fragment_message_from_session(session);
+ if (fm != NULL)
+ {
+
+ ack2 = fm->head;
+ while (ack2!=NULL){
+ // check for double
+ if (ack2->fragment_num != fh->fragment_off_or_num)
+ {
+ // check if next ack has bigger number
+ if (ack2->fragment_num > fh->fragment_off_or_num)
+ {
+ ack = GNUNET_malloc(sizeof(struct AckQueue));
+ ack->fragment_num = fh->fragment_off_or_num;
+ GNUNET_CONTAINER_DLL_insert_before(fm->head,fm->tail,ack2,ack);
+ //check if finished
+ check_finished_fragment(plugin, fm);
+ return;
+ }
+ }
+ else
+ {
+ //double ack
+ return;
+ }
+ ack2 = ack2->next;
+ }
+ //GNUNET_CONTAINER_DLL_insert_tail(fm->head,fm->tail,ack);
+ //should never happen but...
+ //check_finished_fragment(plugin, fm);
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
+ "WLAN fragment not in fragment list but id is right\n");
+ return;
+ }
+
+ }
+
+ }
+ else
+ {
+ // TODO Wrong data?
+ GNUNET_log(GNUNET_ERROR_TYPE_INFO, "WLAN packet has not the right type\n");
+ return;
+ }
+}
/**
- * 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
+ * Function used for to process the data from the suid process
*/
+//TODO doxigen
-static int
-wlan_transport_start_wlan_helper(struct Plugin *plugin)
+static void
+wlan_process_helper (void *cls,
+ void *client,
+ const struct GNUNET_MessageHeader *hdr)
{
+ struct Plugin *plugin = cls;
+ struct IeeeHeader * wlanIeeeHeader = NULL;
+ struct Session_light * session_light = NULL;
+ const struct GNUNET_MessageHeader * temp_hdr = NULL;
- plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES);
- if (plugin->server_stdout == NULL)
- return GNUNET_SYSERR;
+ int pos = 0;
- plugin->server_stdin = GNUNET_DISK_pipe(GNUNET_YES);
- if (plugin->server_stdin == NULL)
- 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 (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA)
{
-#if DEBUG_TCP_NAT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to start gnunet-wlan-helper process\n");
-#endif
- return GNUNET_SYSERR;
+ //call wlan_process_helper with the message inside, later with wlan: analyze signal
+ GNUNET_assert(ntohs(hdr->size) >= sizeof(struct IeeeHeader));
+ wlanIeeeHeader = (struct IeeeHeader *) &hdr[1];
+
+ session_light = GNUNET_malloc(sizeof(struct Session_light));
+ memcpy(session_light->addr, &(wlanIeeeHeader->mac3), sizeof(struct MacAddress));
+ session_light->session = search_session(plugin, session_light->addr);
+
+ //process only if it is an broadcast or for this computer both with the gnunet bssid
+ //check for bssid
+ if (memcmp(&(wlanIeeeHeader->mac2), macbc, sizeof(struct MacAddress)))
+ {
+ //check for broadcast or mac
+ if (memcmp(&(wlanIeeeHeader->mac1), bc_all_mac, sizeof(struct MacAddress))
+ || memcmp(&(wlanIeeeHeader->mac1), &(plugin->mac_address),
+ sizeof(struct MacAddress)))
+ {
+ // process the inner data
+ pos = 0;
+ temp_hdr = (struct GNUNET_MessageHeader *) &wlanIeeeHeader[1];
+ while (pos < hdr->size)
+ {
+ wlan_data_helper(plugin, &session_light, temp_hdr);
+ pos += temp_hdr->size + sizeof(struct GNUNET_MessageHeader);
+ }
+ }
+ }
+
+ //clean up
+ GNUNET_free(session_light);
+
}
- /* 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);
- 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 (plugin->env->sched,
- GNUNET_TIME_UNIT_FOREVER_REL,
- plugin->server_stdout_handle, &wlan_plugin_helper_read, plugin);
- return GNUNET_YES;
-}
+ else if (ntohs(hdr->type) == GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL)
+ {
+ //TODO more control
+ //TODO use struct wlan_helper_control
+ if (ntohs(hdr->size) == sizeof(struct Wlan_Helper_Control_Message))
+ {
+ //plugin->mac_address = GNUNET_malloc(sizeof(struct MacAddress));
+ memcpy(&(plugin->mac_address), &hdr[1], sizeof(struct MacAddress));
+ 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(struct MacAddress),
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ }
+ else
+ {
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Wrong wlan mac address %s\n",
+ plugin->mac_address);
+ }
+
+ }
+ else
+ {
+ // TODO Wrong data?
+ GNUNET_log(GNUNET_ERROR_TYPE_INFO, "WLAN helper packet has not the right type\n");
+ return;
+ }
+}
static void
-wlan_plugin_helper_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+wlan_plugin_helper_read (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct Plugin *plugin = cls;
- char mybuf[3000]; //max size of packet from helper
- ssize_t bytes;
- //memset(&mybuf, 0, sizeof(mybuf)); //?
- int i;
+ plugin->server_read_task = GNUNET_SCHEDULER_NO_TASK;
+ char mybuf[WLAN_MTU + sizeof(struct GNUNET_MessageHeader)];
+ ssize_t bytes;
if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
return;
- bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
-
- if (bytes < 1)
+ bytes = GNUNET_DISK_file_read (plugin->server_stdout_handle,
+ mybuf, sizeof(mybuf));
+ if (bytes <= 0)
{
-#if DEBUG_TCP_NAT
+#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->consoltoken, 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 (plugin->env->sched,
- GNUNET_TIME_UNIT_FOREVER_REL,
+ 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":"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;
+ }
+ /* 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_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);
+ plugin->server_read_task = GNUNET_SCHEDULER_add_read_file(
+ GNUNET_TIME_UNIT_FOREVER_REL, plugin->server_stdout_handle,
+ &wlan_plugin_helper_read, plugin);
+ return GNUNET_YES;
}
+/**
+ * Exit point from the plugin.
+ */
+//TODO doxigen
+//FIXME cleanup
+void *
+libgnunet_plugin_transport_wlan_done (void *cls)
+{
+ struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
+ struct Plugin *plugin = api->cls;
+
+ GNUNET_assert(cls !=NULL);
+
+ if (plugin->consoltoken != NULL)
+ GNUNET_SERVER_mst_destroy(plugin->consoltoken);
+
+ GNUNET_free_non_null(plugin->interface);
+ 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;
+ int testmode;
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;
+
+ testmode = GNUNET_NO;
+ if (GNUNET_CONFIGURATION_have_value (env->cfg,
+ "transport-wlan", "TESTMODE"))
+ {
+ testmode = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
+ "transport-wlan","TESTMODE");
+ }
+
+ 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(plugin);
+ return NULL;
+ }
+ }
+
+ wlan_transport_start_wlan_helper(plugin, testmode);
+ plugin->consoltoken = GNUNET_SERVER_mst_create(&wlan_process_helper,plugin);
+
+ //plugin->sessions = GNUNET_malloc (sizeof (struct Sessionqueue));
+ //plugin->pending_Sessions = 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;
-}
-
-
-/**
- * Exit point from the plugin.
- */
-void *
-gnunet_plugin_transport_wlan_done (void *cls)
-{
- struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
- struct Plugin *plugin = api->cls;
- GNUNET_assert(cls !=NULL);
+ start_next_message_id();
- GNUNET_free (plugin);
- GNUNET_free (api);
- return NULL;
+ return api;
}
/* end of plugin_transport_wlan.c */
projects / oweals / gnunet.git / blobdiff