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- /*
- This file is part of GNUnet.
- Copyright (C) 2009-2013, 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_hello_get.c
- * @brief library to obtain our HELLO from our transport service
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_constants.h"
- #include "gnunet_arm_service.h"
- #include "gnunet_hello_lib.h"
- #include "gnunet_protocols.h"
- #include "gnunet_transport_hello_service.h"
- #include "transport.h"
- /**
- * Functions to call with this peer's HELLO.
- */
- struct GNUNET_TRANSPORT_HelloGetHandle
- {
- /**
- * Our configuration.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Transport handle.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Callback to call once we got our HELLO.
- */
- GNUNET_TRANSPORT_HelloUpdateCallback rec;
- /**
- * Closure for @e rec.
- */
- void *rec_cls;
- /**
- * Task for calling the HelloUpdateCallback when we already have a HELLO
- */
- struct GNUNET_SCHEDULER_Task *notify_task;
- /**
- * ID of the task trying to reconnect to the service.
- */
- struct GNUNET_SCHEDULER_Task *reconnect_task;
- /**
- * Delay until we try to reconnect.
- */
- struct GNUNET_TIME_Relative reconnect_delay;
- /**
- * Type of HELLOs client cares about.
- */
- enum GNUNET_TRANSPORT_AddressClass ac;
- };
- /**
- * Function we use for checking incoming HELLO messages.
- *
- * @param cls closure, a `struct GNUNET_TRANSPORT_Handle *`
- * @param msg message received
- * @return #GNUNET_OK if message is well-formed
- */
- static int
- check_hello (void *cls,
- const struct GNUNET_MessageHeader *msg)
- {
- struct GNUNET_PeerIdentity me;
- if (GNUNET_OK !=
- GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg,
- &me))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving (my own) HELLO message (%u bytes), I am `%s'.\n",
- (unsigned int) ntohs (msg->size),
- GNUNET_i2s (&me));
- return GNUNET_OK;
- }
- /**
- * Function we use for handling incoming HELLO messages.
- *
- * @param cls closure, a `struct GNUNET_TRANSPORT_HelloGetHandle *`
- * @param msg message received
- */
- static void
- handle_hello (void *cls,
- const struct GNUNET_MessageHeader *msg)
- {
- struct GNUNET_TRANSPORT_HelloGetHandle *ghh = cls;
- ghh->rec (ghh->rec_cls,
- msg);
- }
- /**
- * Function that will schedule the job that will try
- * to connect us again to the client.
- *
- * @param ghh transport service to reconnect
- */
- static void
- schedule_reconnect (struct GNUNET_TRANSPORT_HelloGetHandle *ghh);
- /**
- * 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_Handle *`
- * @param error error code
- */
- static void
- mq_error_handler (void *cls,
- enum GNUNET_MQ_Error error)
- {
- struct GNUNET_TRANSPORT_HelloGetHandle *ghh = cls;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Error receiving from transport service, disconnecting temporarily.\n");
- GNUNET_MQ_destroy (ghh->mq);
- ghh->mq = NULL;
- schedule_reconnect (ghh);
- }
- /**
- * Try again to connect to transport service.
- *
- * @param cls the handle to the transport service
- */
- static void
- reconnect (void *cls)
- {
- struct GNUNET_TRANSPORT_HelloGetHandle *ghh = cls;
- struct GNUNET_MQ_MessageHandler handlers[] = {
- GNUNET_MQ_hd_var_size (hello,
- GNUNET_MESSAGE_TYPE_HELLO,
- struct GNUNET_MessageHeader,
- ghh),
- GNUNET_MQ_handler_end ()
- };
- struct GNUNET_MQ_Envelope *env;
- struct StartMessage *s;
- ghh->reconnect_task = NULL;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Connecting to transport service.\n");
- GNUNET_assert (NULL == ghh->mq);
- ghh->mq = GNUNET_CLIENT_connect (ghh->cfg,
- "transport",
- handlers,
- &mq_error_handler,
- ghh);
- if (NULL == ghh->mq)
- return;
- env = GNUNET_MQ_msg (s,
- GNUNET_MESSAGE_TYPE_TRANSPORT_START);
- s->options = htonl (0);
- GNUNET_MQ_send (ghh->mq,
- env);
- }
- /**
- * Function that will schedule the job that will try
- * to connect us again to the client.
- *
- * @param ghh transport service to reconnect
- */
- static void
- schedule_reconnect (struct GNUNET_TRANSPORT_HelloGetHandle *ghh)
- {
- ghh->reconnect_task =
- GNUNET_SCHEDULER_add_delayed (ghh->reconnect_delay,
- &reconnect,
- ghh);
- ghh->reconnect_delay = GNUNET_TIME_STD_BACKOFF (ghh->reconnect_delay);
- }
- /**
- * Obtain the HELLO message for this peer. The callback given in this function
- * is never called synchronously.
- *
- * @param cfg configuration
- * @param ac which network type should the addresses from the HELLO belong to?
- * @param rec function to call with the HELLO, sender will be our peer
- * identity; message and sender will be NULL on timeout
- * (handshake with transport service pending/failed).
- * cost estimate will be 0.
- * @param rec_cls closure for @a rec
- * @return handle to cancel the operation
- */
- struct GNUNET_TRANSPORT_HelloGetHandle *
- GNUNET_TRANSPORT_hello_get (const struct GNUNET_CONFIGURATION_Handle *cfg,
- enum GNUNET_TRANSPORT_AddressClass ac,
- GNUNET_TRANSPORT_HelloUpdateCallback rec,
- void *rec_cls)
- {
- struct GNUNET_TRANSPORT_HelloGetHandle *ghh;
- ghh = GNUNET_new (struct GNUNET_TRANSPORT_HelloGetHandle);
- ghh->rec = rec;
- ghh->rec_cls = rec_cls;
- ghh->cfg = cfg;
- ghh->ac = ac;
- reconnect (ghh);
- if (NULL == ghh->mq)
- {
- GNUNET_free (ghh);
- return NULL;
- }
- return ghh;
- }
- /**
- * Stop receiving updates about changes to our HELLO message.
- *
- * @param ghh handle to cancel
- */
- void
- GNUNET_TRANSPORT_hello_get_cancel (struct GNUNET_TRANSPORT_HelloGetHandle *ghh)
- {
- if (NULL != ghh->reconnect_task)
- {
- GNUNET_SCHEDULER_cancel (ghh->reconnect_task);
- ghh->reconnect_task = NULL;
- }
- if (NULL != ghh->mq)
- {
- GNUNET_MQ_destroy (ghh->mq);
- ghh->mq = NULL;
- }
- GNUNET_free (ghh);
- }
- /* end of transport_api_hello_get.c */
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