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-/*
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- This file is part of GNUnet.
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- Copyright (C) 2009-2013, 2016, 2018, 2019 GNUnet e.V.
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-
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- GNUnet is free software: you can redistribute it and/or modify it
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- under the terms of the GNU Affero General Public License as published
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- by the Free Software Foundation, either version 3 of the License,
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- or (at your option) any later version.
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-
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- GNUnet is distributed in the hope that it will be useful, but
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- WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- Affero General Public License for more details.
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-
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- You should have received a copy of the GNU Affero General Public License
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- along with this program. If not, see <http://www.gnu.org/licenses/>.
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-
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- SPDX-License-Identifier: AGPL3.0-or-later
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-*/
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-
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-/**
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- * @file transport/transport_api2_address.c
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- * @brief library to inform the transport service about addresses to be validated
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- * @author Christian Grothoff
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- */
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-#include "platform.h"
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-#include "gnunet_util_lib.h"
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-#include "gnunet_constants.h"
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-#include "gnunet_protocols.h"
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-#include "gnunet_transport_address_service.h"
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-#include "gnunet_ats_transport_service.h"
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-#include "transport.h"
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-
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-#define LOG(kind, ...) \
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- GNUNET_log_from (kind, "transport-api-address", __VA_ARGS__)
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-
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-
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-/**
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- * Handle for the transport service (includes all of the
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- * state for the transport service).
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- */
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-struct GNUNET_TRANSPORT_AddressHandle
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-{
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-
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- /**
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- * My client connection to the transport service.
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- */
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- struct GNUNET_MQ_Handle *mq;
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-
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- /**
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- * My configuration.
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- */
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- const struct GNUNET_CONFIGURATION_Handle *cfg;
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-
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- /**
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- * ID of the task trying to reconnect to the service.
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- */
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- struct GNUNET_SCHEDULER_Task *reconnect_task;
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-
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- /**
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- * Delay until we try to reconnect.
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- */
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- struct GNUNET_TIME_Relative reconnect_delay;
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-};
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-
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-
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-/**
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- * Function that will schedule the job that will try
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- * to connect us again to the client.
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- *
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- * @param h transport service to reconnect
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- */
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-static void
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-disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_AddressHandle *h);
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-
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-
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-/**
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- * Generic error handler, called with the appropriate
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- * error code and the same closure specified at the creation of
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- * the message queue.
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- * Not every message queue implementation supports an error handler.
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- *
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- * @param cls closure with the `struct GNUNET_TRANSPORT_AddressHandle *`
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- * @param error error code
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- */
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-static void
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-mq_error_handler (void *cls, enum GNUNET_MQ_Error error)
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-{
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- struct GNUNET_TRANSPORT_AddressHandle *h = cls;
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-
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- LOG (GNUNET_ERROR_TYPE_DEBUG,
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- "Error receiving from transport service, disconnecting temporarily.\n");
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- disconnect_and_schedule_reconnect (h);
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-}
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-
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-
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-/**
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- * Try again to connect to transport service.
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- *
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- * @param cls the handle to the transport service
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- */
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-static void
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-reconnect (void *cls)
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-{
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- struct GNUNET_TRANSPORT_AddressHandle *h = cls;
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- struct GNUNET_MQ_MessageHandler handlers[] = {GNUNET_MQ_handler_end ()};
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-
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- h->reconnect_task = NULL;
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- LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
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- GNUNET_assert (NULL == h->mq);
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- h->mq =
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- GNUNET_CLIENT_connect (h->cfg, "transport", handlers, &mq_error_handler, h);
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-}
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-
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-
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-/**
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- * Disconnect from the transport service.
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- *
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- * @param h transport service to disconnect
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- */
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-static void
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-disconnect (struct GNUNET_TRANSPORT_AddressHandle *h)
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-{
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- if (NULL != h->mq)
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- {
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- GNUNET_MQ_destroy (h->mq);
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- h->mq = NULL;
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- }
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-}
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-
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-
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-/**
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- * Function that will schedule the job that will try
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- * to connect us again to the client.
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- *
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- * @param h transport service to reconnect
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- */
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-static void
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-disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_AddressHandle *h)
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-{
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- GNUNET_assert (NULL == h->reconnect_task);
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- disconnect (h);
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- LOG (GNUNET_ERROR_TYPE_DEBUG,
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- "Scheduling task to reconnect to transport service in %s.\n",
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- GNUNET_STRINGS_relative_time_to_string (h->reconnect_delay, GNUNET_YES));
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- h->reconnect_task =
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- GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
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- h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
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-}
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-
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-
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-/**
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- * Connect to the transport service.
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- *
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- * @param cfg configuration to use
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- * @return NULL on error
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- */
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-struct GNUNET_TRANSPORT_AddressHandle *
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-GNUNET_TRANSPORT_address_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
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-{
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- struct GNUNET_TRANSPORT_AddressHandle *h;
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-
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- h = GNUNET_new (struct GNUNET_TRANSPORT_AddressHandle);
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- h->cfg = cfg;
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- h->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
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- LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service\n");
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- reconnect (h);
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- if (NULL == h->mq)
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- {
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- GNUNET_free (h);
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- return NULL;
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- }
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- return h;
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-}
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-
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-
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-/**
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- * Disconnect from the transport service.
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- *
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- * @param handle handle to the service as returned from #GNUNET_TRANSPORT_address_connect()
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- */
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-void
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-GNUNET_TRANSPORT_address_disconnect (
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- struct GNUNET_TRANSPORT_AddressHandle *handle)
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-{
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- LOG (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
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- /* this disconnects all neighbours... */
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- disconnect (handle);
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- /* and now we stop trying to connect again... */
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- if (NULL != handle->reconnect_task)
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- {
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- GNUNET_SCHEDULER_cancel (handle->reconnect_task);
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- handle->reconnect_task = NULL;
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- }
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- GNUNET_free (handle);
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-}
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-
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-
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-/**
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- * The client has learned about a possible address for peer @a pid
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- * (i.e. via broadcast, multicast, DHT, ...). The transport service
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- * should consider validating it. Note that the plugin is NOT expected
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- * to have verified the signature, the transport service must decide
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- * whether to check the signature.
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- *
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- * While the notification is sent to @a ch asynchronously, this API
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- * does not return a handle as the delivery of addresses is simply
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- * unreliable, and if @a ch is down, the data provided will simply be
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- * lost.
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- *
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- * @param ch communicator handle
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- * @param pid peer the address is for
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- * @param raw raw address data
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- * @param raw_size number of bytes in @a raw
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- */
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-void
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-GNUNET_TRANSPORT_address_try (struct GNUNET_TRANSPORT_AddressHandle *ch,
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- const struct GNUNET_PeerIdentity *pid,
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- const void *raw,
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- const size_t raw_size)
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-{
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- struct GNUNET_MQ_Envelope *env;
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- struct GNUNET_TRANSPORT_AddressToVerify *hdr;
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-
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- env =
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- GNUNET_MQ_msg_extra (hdr,
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- raw_size,
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- GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_CONSIDER_VERIFY);
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- hdr->peer = *pid;
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- memcpy (&hdr[1], raw, raw_size);
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- GNUNET_MQ_send (ch->mq, env);
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-}
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-
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-
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-/* end of transport_api2_address.c */
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