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- /*
- This file is part of GNUnet.
- Copyright (C) 2010-2014, 2016 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file transport/transport_api_blacklist.c
- * @brief library to access the blacklisting functions of the transport service
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_arm_service.h"
- #include "gnunet_hello_lib.h"
- #include "gnunet_protocols.h"
- #include "gnunet_transport_service.h"
- #include "transport.h"
- /**
- * Handle for blacklisting requests.
- */
- struct GNUNET_TRANSPORT_Blacklist
- {
- /**
- * Connection to transport service.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Configuration to use.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Function to call for determining if a peer is allowed
- * to communicate with us.
- */
- GNUNET_TRANSPORT_BlacklistCallback cb;
- /**
- * Closure for @e cb.
- */
- void *cb_cls;
- };
- /**
- * Establish blacklist connection to transport service.
- *
- * @param br overall handle
- */
- static void
- reconnect (struct GNUNET_TRANSPORT_Blacklist *br);
- /**
- * Handle blacklist queries.
- *
- * @param cls our overall handle
- * @param bm query
- */
- static void
- handle_query (void *cls,
- const struct BlacklistMessage *bm)
- {
- struct GNUNET_TRANSPORT_Blacklist *br = cls;
- struct GNUNET_MQ_Envelope *env;
- struct BlacklistMessage *res;
- GNUNET_break (0 == ntohl (bm->is_allowed));
- env = GNUNET_MQ_msg (res,
- GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY);
- res->is_allowed = htonl (br->cb (br->cb_cls,
- &bm->peer));
- res->peer = bm->peer;
- GNUNET_MQ_send (br->mq,
- env);
- }
- /**
- * Generic error handler, called with the appropriate error code and
- * the same closure specified at the creation of the message queue.
- * Not every message queue implementation supports an error handler.
- *
- * @param cls closure with the `struct GNUNET_TRANSPORT_Blacklist *`
- * @param error error code
- */
- static void
- mq_error_handler (void *cls,
- enum GNUNET_MQ_Error error)
- {
- struct GNUNET_TRANSPORT_Blacklist *br = cls;
- reconnect (br);
- }
- /**
- * Establish blacklist connection to transport service.
- *
- * @param br overall handle
- */
- static void
- reconnect (struct GNUNET_TRANSPORT_Blacklist *br)
- {
- struct GNUNET_MQ_MessageHandler handlers[] = {
- GNUNET_MQ_hd_fixed_size (query,
- GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY,
- struct BlacklistMessage,
- br),
- GNUNET_MQ_handler_end ()
- };
- struct GNUNET_MQ_Envelope *env;
- struct GNUNET_MessageHeader *req;
- if (NULL != br->mq)
- GNUNET_MQ_destroy (br->mq);
- br->mq = GNUNET_CLIENT_connect (br->cfg,
- "transport",
- handlers,
- &mq_error_handler,
- br);
- if (NULL == br->mq)
- return;
- env = GNUNET_MQ_msg (req,
- GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT);
- GNUNET_MQ_send (br->mq,
- env);
- }
- /**
- * Install a blacklist callback. The service will be queried for all
- * existing connections as well as any fresh connections to check if
- * they are permitted. If the blacklisting callback is unregistered,
- * all hosts that were denied in the past will automatically be
- * whitelisted again. Cancelling the blacklist handle is also the
- * only way to re-enable connections from peers that were previously
- * blacklisted.
- *
- * @param cfg configuration to use
- * @param cb callback to invoke to check if connections are allowed
- * @param cb_cls closure for @a cb
- * @return NULL on error, otherwise handle for cancellation
- */
- struct GNUNET_TRANSPORT_Blacklist *
- GNUNET_TRANSPORT_blacklist (const struct GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_TRANSPORT_BlacklistCallback cb,
- void *cb_cls)
- {
- struct GNUNET_TRANSPORT_Blacklist *br;
- br = GNUNET_new (struct GNUNET_TRANSPORT_Blacklist);
- br->cfg = cfg;
- br->cb = cb;
- br->cb_cls = cb_cls;
- reconnect (br);
- if (NULL == br->mq)
- {
- GNUNET_free (br);
- return NULL;
- }
- return br;
- }
- /**
- * Abort the blacklist. Note that this function is the only way for
- * removing a peer from the blacklist.
- *
- * @param br handle of the request that is to be cancelled
- */
- void
- GNUNET_TRANSPORT_blacklist_cancel (struct GNUNET_TRANSPORT_Blacklist *br)
- {
- GNUNET_MQ_destroy (br->mq);
- GNUNET_free (br);
- }
- /* end of transport_api_blacklist.c */
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