gnunet-service-core_sessions.h File Reference

#include "gnunet-service-core.h"
#include "gnunet-service-core_kx.h"

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Functions
void	GSC_SESSIONS_create (const struct GNUNET_PeerIdentity *peer, struct GSC_KeyExchangeInfo *kx)
	Create a session, a key exchange was just completed. More...
void	GSC_SESSIONS_reinit (const struct GNUNET_PeerIdentity *peer)
	The other peer has indicated that it 'lost' the session (KX down), reinitialize the session on our end, in particular this means to restart the typemap transmission. More...
void	GSC_SESSIONS_confirm_typemap (const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *msg)
	The other peer has confirmed receiving our type map, check if it is current and if so, stop retransmitting it. More...
void	GSC_SESSIONS_end (const struct GNUNET_PeerIdentity *pid)
	End the session with the given peer (we are no longer connected). More...
void	GSC_SESSIONS_solicit (const struct GNUNET_PeerIdentity *pid)
	Traffic is being solicited for the given peer. More...
void	GSC_SESSIONS_queue_request (struct GSC_ClientActiveRequest *car)
	Queue a request from a client for transmission to a particular peer. More...
void	GSC_SESSIONS_dequeue_request (struct GSC_ClientActiveRequest *car)
	Dequeue a request from a client from transmission to a particular peer. More...
void	GSC_SESSIONS_transmit (struct GSC_ClientActiveRequest *car, const struct GNUNET_MessageHeader *msg, enum GNUNET_MQ_PriorityPreferences priority)
	Transmit a message to a particular peer. More...
void	GSC_SESSIONS_broadcast_typemap (const struct GNUNET_MessageHeader *msg)
	Broadcast an updated typemap message to all neighbours. More...
void	GSC_SESSIONS_notify_client_about_sessions (struct GSC_Client *client)
	We have a new client, notify it about all current sessions. More...
void	GSC_SESSIONS_set_typemap (const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *msg)
	We've received a typemap message from a peer, update ours. More...
void	GSC_SESSIONS_add_to_typemap (const struct GNUNET_PeerIdentity *peer, uint16_t type)
	The given peer send a message of the specified type. More...
void	GSC_SESSIONS_init (void)
	Initialize sessions subsystem. More...
void	GSC_SESSIONS_done (void)
	Shutdown sessions subsystem. More...

Function Documentation

GSC_SESSIONS_create()

void GSC_SESSIONS_create	(	const struct GNUNET_PeerIdentity *	peer,
		struct GSC_KeyExchangeInfo *	kx
	)

Create a session, a key exchange was just completed.

Parameters

peer	peer that is now connected
kx	key exchange that completed

Definition at line 318 of file gnunet-service-core_sessions.c.

{
  struct Session *session;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Creating session for peer `%s'\n",
              GNUNET_i2s (peer));
  session = GNUNET_new (struct Session);
  session->tmap = GSC_TYPEMAP_create ();
  session->peer = peer;
  session->kx = kx;
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_CONTAINER_multipeermap_put (
                   sessions,
                   session->peer,
                   session,
                   GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
  GNUNET_STATISTICS_set (GSC_stats,
                         gettext_noop ("# peers connected"),
                         GNUNET_CONTAINER_multipeermap_size (sessions),
                         GNUNET_NO);
  GSC_CLIENTS_notify_clients_about_neighbour (peer, NULL, session->tmap);
  start_typemap_task (session);
}

References gettext_noop, GNUNET_assert, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_CONTAINER_multipeermap_put(), GNUNET_CONTAINER_multipeermap_size(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_i2s(), GNUNET_log, GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_STATISTICS_set(), GSC_CLIENTS_notify_clients_about_neighbour(), GSC_stats, GSC_TYPEMAP_create(), Session::kx, Session::peer, peer, sessions, start_typemap_task(), and Session::tmap.

Referenced by handle_pong().

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GSC_SESSIONS_reinit()

void GSC_SESSIONS_reinit

(

const struct GNUNET_PeerIdentity *

peer

)

The other peer has indicated that it 'lost' the session (KX down), reinitialize the session on our end, in particular this means to restart the typemap transmission.

Parameters

peer	peer that is now connected

Definition at line 353 of file gnunet-service-core_sessions.c.

{
  struct Session *session;
 
  session = find_session (peer);
  if (NULL == session)
  {
    /* KX/session is new for both sides; thus no need to restart what
       has not yet begun */
    return;
  }
  start_typemap_task (session);
}

References find_session(), peer, and start_typemap_task().

Referenced by handle_ephemeral_key().

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GSC_SESSIONS_confirm_typemap()

void GSC_SESSIONS_confirm_typemap	(	const struct GNUNET_PeerIdentity *	peer,
		const struct GNUNET_MessageHeader *	msg
	)

The other peer has confirmed receiving our type map, check if it is current and if so, stop retransmitting it.

Parameters

peer	peer that confirmed the type map
msg	confirmation message we received

Definition at line 376 of file gnunet-service-core_sessions.c.

{
  const struct TypeMapConfirmationMessage *cmsg;
  struct Session *session;
 
  session = find_session (peer);
  if (NULL == session)
  {
    GNUNET_break (0);
    return;
  }
  if (ntohs (msg->size) != sizeof(struct TypeMapConfirmationMessage))
  {
    GNUNET_break_op (0);
    return;
  }
  cmsg = (const struct TypeMapConfirmationMessage *) msg;
  if (GNUNET_YES != GSC_TYPEMAP_check_hash (&cmsg->tm_hash))
  {
    /* our typemap has changed in the meantime, do not
       accept confirmation */
    GNUNET_STATISTICS_update (GSC_stats,
                              gettext_noop (
                                "# outdated typemap confirmations received"),
                              1,
                              GNUNET_NO);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Got outdated typemap confirmated from peer `%s'\n",
                GNUNET_i2s (session->peer));
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Got typemap confirmation from peer `%s'\n",
              GNUNET_i2s (session->peer));
  if (NULL != session->typemap_task)
  {
    GNUNET_SCHEDULER_cancel (session->typemap_task);
    session->typemap_task = NULL;
  }
  GNUNET_STATISTICS_update (GSC_stats,
                            gettext_noop (
                              "# valid typemap confirmations received"),
                            1,
                            GNUNET_NO);
}

References find_session(), gettext_noop, GNUNET_break, GNUNET_break_op, GNUNET_ERROR_TYPE_DEBUG, GNUNET_i2s(), GNUNET_log, GNUNET_NO, GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), GNUNET_YES, GSC_stats, GSC_TYPEMAP_check_hash(), msg, Session::peer, peer, GNUNET_MessageHeader::size, TypeMapConfirmationMessage::tm_hash, and Session::typemap_task.

Referenced by deliver_message().

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GSC_SESSIONS_end()

void GSC_SESSIONS_end

(

const struct GNUNET_PeerIdentity *

pid

)

End the session with the given peer (we are no longer connected).

Parameters

pid	identity of peer to kill session with

Definition at line 211 of file gnunet-service-core_sessions.c.

{
  struct Session *session;
  struct GSC_ClientActiveRequest *car;
  struct SessionMessageEntry *sme;
 
  session = find_session (pid);
  if (NULL == session)
    return;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Destroying session for peer `%s'\n",
              GNUNET_i2s (session->peer));
  if (NULL != session->cork_task)
  {
    GNUNET_SCHEDULER_cancel (session->cork_task);
    session->cork_task = NULL;
  }
  while (NULL != (car = session->active_client_request_head))
  {
    GNUNET_CONTAINER_DLL_remove (session->active_client_request_head,
                                 session->active_client_request_tail,
                                 car);
    GSC_CLIENTS_reject_request (car, GNUNET_NO);
  }
  while (NULL != (sme = session->sme_head))
  {
    GNUNET_CONTAINER_DLL_remove (session->sme_head, session->sme_tail, sme);
    GNUNET_free (sme);
  }
  if (NULL != session->typemap_task)
  {
    GNUNET_SCHEDULER_cancel (session->typemap_task);
    session->typemap_task = NULL;
  }
  GSC_CLIENTS_notify_clients_about_neighbour (session->peer,
                                              session->tmap,
                                              NULL);
  GNUNET_assert (
    GNUNET_YES ==
    GNUNET_CONTAINER_multipeermap_remove (sessions, session->peer, session));
  GNUNET_STATISTICS_set (GSC_stats,
                         gettext_noop ("# peers connected"),
                         GNUNET_CONTAINER_multipeermap_size (sessions),
                         GNUNET_NO);
  GSC_TYPEMAP_destroy (session->tmap);
  session->tmap = NULL;
  GNUNET_free (session);
}

References Session::active_client_request_head, Session::active_client_request_tail, Session::cork_task, find_session(), gettext_noop, GNUNET_assert, GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_multipeermap_remove(), GNUNET_CONTAINER_multipeermap_size(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_i2s(), GNUNET_log, GNUNET_NO, GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_set(), GNUNET_YES, GSC_CLIENTS_notify_clients_about_neighbour(), GSC_CLIENTS_reject_request(), GSC_stats, GSC_TYPEMAP_destroy(), Session::peer, pid, sessions, Session::sme_head, Session::sme_tail, Session::tmap, and Session::typemap_task.

Referenced by free_session_helper(), handle_encrypted(), handle_transport_notify_disconnect(), and send_keep_alive().

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GSC_SESSIONS_solicit()

void GSC_SESSIONS_solicit

(

const struct GNUNET_PeerIdentity *

pid

)

Traffic is being solicited for the given peer.

This means that the message queue on the transport-level (NEIGHBOURS subsystem) is now empty and it is now OK to transmit another (non-control) message.

Parameters

pid	identity of peer ready to receive data

Definition at line 844 of file gnunet-service-core_sessions.c.

{
  struct Session *session;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Transport solicits for %s\n",
              GNUNET_i2s (pid));
  session = find_session (pid);
  if (NULL == session)
    return;
  try_transmission (session);
}

References find_session(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_i2s(), GNUNET_log, pid, and try_transmission().

Referenced by handle_transport_notify_excess_bw().

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GSC_SESSIONS_queue_request()

void GSC_SESSIONS_queue_request

(

struct GSC_ClientActiveRequest *

car

)

Queue a request from a client for transmission to a particular peer.

Parameters

car	request to queue; this handle is then shared between the caller (CLIENTS subsystem) and SESSIONS and must not be released by either until either 'GNUNET_SESSIONS_dequeue', or 'GNUNET_CLIENTS_failed' have been invoked on it
car	request to queue; this handle is then shared between the caller (CLIENTS subsystem) and SESSIONS and must not be released by either until either #GSC_SESSIONS_dequeue(), GSC_SESSIONS_transmit() or #GSC_CLIENTS_failed() have been invoked on it

Definition at line 483 of file gnunet-service-core_sessions.c.

{
  struct Session *session;
 
  session = find_session (&car->target);
  if (NULL == session)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Dropped client request for transmission (am disconnected)\n");
    GNUNET_break (0);  /* should have been rejected earlier */
    GSC_CLIENTS_reject_request (car, GNUNET_NO);
    return;
  }
  if (car->msize > GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE)
  {
    GNUNET_break (0);
    GSC_CLIENTS_reject_request (car, GNUNET_YES);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received client transmission request. queueing\n");
  GNUNET_CONTAINER_DLL_insert_tail (session->active_client_request_head,
                                    session->active_client_request_tail,
                                    car);
  try_transmission (session);
}

References Session::active_client_request_head, Session::active_client_request_tail, find_session(), GNUNET_break, GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_NO, GNUNET_YES, GSC_CLIENTS_reject_request(), GSC_ClientActiveRequest::msize, GSC_ClientActiveRequest::target, and try_transmission().

Referenced by handle_client_send_request().

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GSC_SESSIONS_dequeue_request()

void GSC_SESSIONS_dequeue_request

(

struct GSC_ClientActiveRequest *

car

)

Dequeue a request from a client from transmission to a particular peer.

Parameters

car	request to dequeue; this handle will then be 'owned' by the caller (CLIENTS sysbsystem)

Definition at line 518 of file gnunet-service-core_sessions.c.

{
  struct Session *session;
 
  if (0 == memcmp (&car->target,
                   &GSC_my_identity,
                   sizeof(struct GNUNET_PeerIdentity)))
    return;
  session = find_session (&car->target);
  GNUNET_assert (NULL != session);
  GNUNET_CONTAINER_DLL_remove (session->active_client_request_head,
                               session->active_client_request_tail,
                               car);
  /* dequeueing of 'high' priority messages may unblock
     transmission for lower-priority messages, so we also
     need to try in this case. */
  try_transmission (session);
}

References Session::active_client_request_head, Session::active_client_request_tail, find_session(), GNUNET_assert, GNUNET_CONTAINER_DLL_remove, GSC_my_identity, GSC_ClientActiveRequest::target, and try_transmission().

Referenced by destroy_active_client_request(), GSC_CLIENTS_solicit_request(), handle_client_send(), and handle_client_send_request().

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GSC_SESSIONS_transmit()

void GSC_SESSIONS_transmit	(	struct GSC_ClientActiveRequest *	car,
		const struct GNUNET_MessageHeader *	msg,
		enum GNUNET_MQ_PriorityPreferences	priority
	)

Transmit a message to a particular peer.

Parameters

car	original request that was queued and then solicited, ownership does not change (dequeue will be called soon).
msg	message to transmit
priority	how important is this message

Definition at line 859 of file gnunet-service-core_sessions.c.

{
  struct Session *session;
  struct SessionMessageEntry *sme;
  struct SessionMessageEntry *pos;
  size_t msize;
 
  session = find_session (&car->target);
  if (NULL == session)
    return;
  msize = ntohs (msg->size);
  sme = GNUNET_malloc (sizeof(struct SessionMessageEntry) + msize);
  GNUNET_memcpy (&sme[1], msg, msize);
  sme->size = msize;
  sme->priority = priority;
  if (0 != (GNUNET_MQ_PREF_CORK_ALLOWED & priority))
  {
    sme->deadline =
      GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Message corked, delaying transmission\n");
  }
  pos = session->sme_head;
  while ((NULL != pos) && (pos->priority >= sme->priority))
    pos = pos->next;
  if (NULL == pos)
    GNUNET_CONTAINER_DLL_insert_tail (session->sme_head,
                                      session->sme_tail,
                                      sme);
  else
    GNUNET_CONTAINER_DLL_insert_after (session->sme_head,
                                       session->sme_tail,
                                       pos->prev,
                                       sme);
  try_transmission (session);
}

References SessionMessageEntry::deadline, find_session(), GNUNET_CONSTANTS_MAX_CORK_DELAY, GNUNET_CONTAINER_DLL_insert_after, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_MQ_PREF_CORK_ALLOWED, GNUNET_TIME_relative_to_absolute(), msg, SessionMessageEntry::next, SessionMessageEntry::prev, SessionMessageEntry::priority, SessionMessageEntry::size, GNUNET_MessageHeader::size, Session::sme_head, Session::sme_tail, GSC_ClientActiveRequest::target, and try_transmission().

Referenced by tokenized_cb().

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GSC_SESSIONS_broadcast_typemap()

void GSC_SESSIONS_broadcast_typemap

(

const struct GNUNET_MessageHeader *

msg

)

Broadcast an updated typemap message to all neighbours.

Restarts the retransmissions until the typemaps are confirmed.

Parameters

msg	message to transmit

Definition at line 826 of file gnunet-service-core_sessions.c.

{
  if (NULL == sessions)
    return;
  GNUNET_CONTAINER_multipeermap_iterate (sessions,
                                         &do_restart_typemap_message,
                                         (void *) msg);
}

References do_restart_typemap_message(), GNUNET_CONTAINER_multipeermap_iterate(), msg, and sessions.

Referenced by broadcast_my_type_map().

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GSC_SESSIONS_notify_client_about_sessions()

void GSC_SESSIONS_notify_client_about_sessions

(

struct GSC_Client *

client

)

We have a new client, notify it about all current sessions.

Parameters

client

the new client

Definition at line 454 of file gnunet-service-core_sessions.c.

{
  /* notify new client about existing sessions */
  GNUNET_CONTAINER_multipeermap_iterate (sessions,
                                         &notify_client_about_session,
                                         client);
}

References GNUNET_CONTAINER_multipeermap_iterate(), notify_client_about_session(), and sessions.

Referenced by handle_client_init().

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GSC_SESSIONS_set_typemap()

void GSC_SESSIONS_set_typemap	(	const struct GNUNET_PeerIdentity *	peer,
		const struct GNUNET_MessageHeader *	msg
	)

We've received a typemap message from a peer, update ours.

Notifies clients about the session.

Parameters

peer	peer this is about
msg	typemap update message

Definition at line 900 of file gnunet-service-core_sessions.c.

{
  struct Session *session;
  struct GSC_TypeMap *nmap;
  struct SessionMessageEntry *sme;
  struct TypeMapConfirmationMessage *tmc;
 
  nmap = GSC_TYPEMAP_get_from_message (msg);
  if (NULL == nmap)
  {
    GNUNET_break_op (0);
    return;   /* malformed */
  }
  session = find_session (peer);
  if (NULL == session)
  {
    GSC_TYPEMAP_destroy (nmap);
    GNUNET_break (0);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received TYPEMAP from %s\n",
              GNUNET_i2s (session->peer));
  for (sme = session->sme_head; NULL != sme; sme = sme->next)
  {
    if (GNUNET_YES == sme->is_typemap_confirm)
    {
      GNUNET_CONTAINER_DLL_remove (session->sme_head, session->sme_tail, sme);
      GNUNET_free (sme);
      break;
    }
  }
  sme = GNUNET_malloc (sizeof(struct SessionMessageEntry)
                       + sizeof(struct TypeMapConfirmationMessage));
  sme->deadline = GNUNET_TIME_absolute_get ();
  sme->size = sizeof(struct TypeMapConfirmationMessage);
  sme->priority = GNUNET_MQ_PRIO_CRITICAL_CONTROL;
  sme->is_typemap_confirm = GNUNET_YES;
  tmc = (struct TypeMapConfirmationMessage *) &sme[1];
  tmc->header.size = htons (sizeof(struct TypeMapConfirmationMessage));
  tmc->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIRM_TYPE_MAP);
  tmc->reserved = htonl (0);
  GSC_TYPEMAP_hash (nmap, &tmc->tm_hash);
  GNUNET_CONTAINER_DLL_insert (session->sme_head, session->sme_tail, sme);
  try_transmission (session);
  GSC_CLIENTS_notify_clients_about_neighbour (peer, session->tmap, nmap);
  GSC_TYPEMAP_destroy (session->tmap);
  session->tmap = nmap;
}

References SessionMessageEntry::deadline, find_session(), GNUNET_break, GNUNET_break_op, GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_i2s(), GNUNET_log, GNUNET_malloc, GNUNET_MESSAGE_TYPE_CORE_CONFIRM_TYPE_MAP, GNUNET_MQ_PRIO_CRITICAL_CONTROL, GNUNET_TIME_absolute_get(), GNUNET_YES, GSC_CLIENTS_notify_clients_about_neighbour(), GSC_TYPEMAP_destroy(), GSC_TYPEMAP_get_from_message(), GSC_TYPEMAP_hash(), TypeMapConfirmationMessage::header, SessionMessageEntry::is_typemap_confirm, msg, SessionMessageEntry::next, Session::peer, peer, SessionMessageEntry::priority, TypeMapConfirmationMessage::reserved, SessionMessageEntry::size, GNUNET_MessageHeader::size, Session::sme_head, Session::sme_tail, TypeMapConfirmationMessage::tm_hash, Session::tmap, try_transmission(), and GNUNET_MessageHeader::type.

Referenced by deliver_message().

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GSC_SESSIONS_add_to_typemap()

void GSC_SESSIONS_add_to_typemap	(	const struct GNUNET_PeerIdentity *	peer,
		uint16_t	type
	)

The given peer send a message of the specified type.

Make sure the respective bit is set in its type-map and that clients are notified about the session.

Parameters

peer	peer this is about
type	type of the message

Definition at line 961 of file gnunet-service-core_sessions.c.

{
  struct Session *session;
  struct GSC_TypeMap *nmap;
 
  if (0 == memcmp (peer, &GSC_my_identity, sizeof(struct GNUNET_PeerIdentity)))
    return;
  session = find_session (peer);
  GNUNET_assert (NULL != session);
  if (GNUNET_YES == GSC_TYPEMAP_test_match (session->tmap, &type, 1))
    return; /* already in it */
  nmap = GSC_TYPEMAP_extend (session->tmap, &type, 1);
  GSC_CLIENTS_notify_clients_about_neighbour (peer, session->tmap, nmap);
  GSC_TYPEMAP_destroy (session->tmap);
  session->tmap = nmap;
}

References find_session(), GNUNET_assert, GNUNET_YES, GSC_CLIENTS_notify_clients_about_neighbour(), GSC_my_identity, GSC_TYPEMAP_destroy(), GSC_TYPEMAP_extend(), GSC_TYPEMAP_test_match(), peer, Session::tmap, and type.

Referenced by GSC_CLIENTS_deliver_message().

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GSC_SESSIONS_init()

void GSC_SESSIONS_init

(

void

)

Initialize sessions subsystem.

Definition at line 984 of file gnunet-service-core_sessions.c.

{
  sessions = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
}

References GNUNET_CONTAINER_multipeermap_create(), GNUNET_YES, and sessions.

Referenced by run().

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GSC_SESSIONS_done()

void GSC_SESSIONS_done

(

void

)

Shutdown sessions subsystem.

Definition at line 1015 of file gnunet-service-core_sessions.c.

{
  if (NULL != sessions)
  {
    GNUNET_CONTAINER_multipeermap_iterate (sessions,
                                           &free_session_helper,
                                           NULL);
    GNUNET_CONTAINER_multipeermap_destroy (sessions);
    sessions = NULL;
  }
}

References free_session_helper(), GNUNET_CONTAINER_multipeermap_destroy(), GNUNET_CONTAINER_multipeermap_iterate(), and sessions.

Referenced by shutdown_task().

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