/**
- * Destroy a connection.
+ * Destroy a connection, part of the internal implementation. Called
+ * only from #GCC_destroy_from_core() or #GCC_destroy_from_tunnel().
*
* @param cc connection to destroy
*/
-void
+static void
GCC_destroy (struct CadetConnection *cc)
{
- struct GNUNET_MQ_Envelope *env = NULL;
-
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Destroying %s\n",
GCC_2s (cc));
- if (CADET_CONNECTION_SENDING_CREATE != cc->state)
- {
- struct GNUNET_CADET_ConnectionDestroyMessage *destroy_msg;
-
- /* Need to notify next hop that we are down. */
- env = GNUNET_MQ_msg (destroy_msg,
- GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY);
- destroy_msg->cid = cc->cid;
- }
if (NULL != cc->mq_man)
{
GCP_request_mq_cancel (cc->mq_man,
- env);
+ NULL);
cc->mq_man = NULL;
}
if (NULL != cc->task)
}
+
+/**
+ * Destroy a connection, called when the CORE layer is already done
+ * (i.e. has received a BROKEN message), but if we still have to
+ * communicate the destruction of the connection to the tunnel (if one
+ * exists).
+ *
+ * @param cc connection to destroy
+ */
+void
+GCC_destroy_without_core (struct CadetConnection *cc)
+{
+ if (NULL != cc->ct)
+ {
+ GCT_connection_lost (cc->ct);
+ cc->ct = NULL;
+ }
+ GCC_destroy (cc);
+}
+
+
+/**
+ * Destroy a connection, called if the tunnel association with the
+ * connection was already broken, but we still need to notify the CORE
+ * layer about the breakage.
+ *
+ * @param cc connection to destroy
+ */
+void
+GCC_destroy_without_tunnel (struct CadetConnection *cc)
+{
+ cc->ct = NULL;
+ if ( (CADET_CONNECTION_SENDING_CREATE != cc->state) &&
+ (NULL != cc->mq_man) )
+ {
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_CADET_ConnectionDestroyMessage *destroy_msg;
+
+ /* Need to notify next hop that we are down. */
+ env = GNUNET_MQ_msg (destroy_msg,
+ GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY);
+ destroy_msg->cid = cc->cid;
+ GCP_request_mq_cancel (cc->mq_man,
+ env);
+ cc->mq_man = NULL;
+ }
+ GCC_destroy (cc);
+}
+
+
/**
* Return the tunnel associated with this connection.
*
* @param ct which tunnel uses this connection
* @param ready_cb function to call when ready to transmit
* @param ready_cb_cls closure for @a cb
- * @return handle to the connection
+ * @return handle to the connection, NULL if we already have
+ * a connection that takes precedence on @a path
*/
struct CadetConnection *
GCC_create_inbound (struct CadetPeer *destination,
GCC_ReadyCallback ready_cb,
void *ready_cb_cls)
{
+ struct CadetConnection *cc;
+ unsigned int off;
+
+ off = GCPP_find_peer (path,
+ destination);
+ GNUNET_assert (UINT_MAX != off);
+ cc = GCPP_get_connection (path,
+ destination,
+ off);
+ if (NULL != cc)
+ {
+ int cmp;
+
+ cmp = memcmp (cid,
+ &cc->cid,
+ sizeof (*cid));
+ if (0 == cmp)
+ {
+ /* Two peers picked the SAME random connection identifier at the
+ same time for the same path? Must be malicious. Drop
+ connection (existing and inbound), even if it is the only
+ one. */
+ GNUNET_break_op (0);
+ GCT_connection_lost (cc->ct);
+ GCC_destroy_without_tunnel (cc);
+ return NULL;
+ }
+ if (0 < cmp)
+ {
+ /* drop existing */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got two connections on %s, dropping my existing %s\n",
+ GCPP_2s (path),
+ GCC_2s (cc));
+ GCT_connection_lost (cc->ct);
+ GCC_destroy_without_tunnel (cc);
+ }
+ else
+ {
+ /* keep existing */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got two connections on %s, keeping my existing %s\n",
+ GCPP_2s (path),
+ GCC_2s (cc));
+ return NULL;
+ }
+ }
+
return connection_create (destination,
path,
ct,