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- /*
- This file is part of GNUnet.
- Copyright (C) 2010--2019 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_api2_application.c
- * @brief enable clients to ask TRANSPORT about establishing connections to peers
- * @author Christian Grothoff
- * @author Matthias Wachs
- */
- #include "platform.h"
- #include "gnunet_transport_application_service.h"
- #include "gnunet_transport_core_service.h"
- #include "transport.h"
- #define LOG(kind, ...) \
- GNUNET_log_from (kind, "transport-application-api", __VA_ARGS__)
- /**
- * Handle for TRANSPORT address suggestion requests.
- */
- struct GNUNET_TRANSPORT_ApplicationSuggestHandle
- {
- /**
- * ID of the peer for which address suggestion was requested.
- */
- struct GNUNET_PeerIdentity id;
- /**
- * Connecitivity handle this suggestion handle belongs to.
- */
- struct GNUNET_TRANSPORT_ApplicationHandle *ch;
- /**
- * What preference is being expressed?
- */
- enum GNUNET_MQ_PriorityPreferences pk;
- /**
- * How much bandwidth does the client expect?
- */
- struct GNUNET_BANDWIDTH_Value32NBO bw;
- };
- /**
- * Handle to the TRANSPORT subsystem for application management.
- */
- struct GNUNET_TRANSPORT_ApplicationHandle
- {
- /**
- * Our configuration.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Map with the identities of all the peers for which we would
- * like to have address suggestions. The key is the PID, the
- * value is currently the `struct GNUNET_TRANSPORT_ApplicationSuggestHandle`
- */
- struct GNUNET_CONTAINER_MultiPeerMap *sug_requests;
- /**
- * Message queue for sending requests to the TRANSPORT service.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Task to trigger reconnect.
- */
- struct GNUNET_SCHEDULER_Task *task;
- /**
- * Reconnect backoff delay.
- */
- struct GNUNET_TIME_Relative backoff;
- };
- /**
- * Re-establish the connection to the TRANSPORT service.
- *
- * @param ch handle to use to re-connect.
- */
- static void
- reconnect (struct GNUNET_TRANSPORT_ApplicationHandle *ch);
- /**
- * Re-establish the connection to the TRANSPORT service.
- *
- * @param cls handle to use to re-connect.
- */
- static void
- reconnect_task (void *cls)
- {
- struct GNUNET_TRANSPORT_ApplicationHandle *ch = cls;
- ch->task = NULL;
- reconnect (ch);
- }
- /**
- * Disconnect from TRANSPORT and then reconnect.
- *
- * @param ch our handle
- */
- static void
- force_reconnect (struct GNUNET_TRANSPORT_ApplicationHandle *ch)
- {
- if (NULL != ch->mq)
- {
- GNUNET_MQ_destroy (ch->mq);
- ch->mq = NULL;
- }
- ch->backoff = GNUNET_TIME_STD_BACKOFF (ch->backoff);
- ch->task = GNUNET_SCHEDULER_add_delayed (ch->backoff, &reconnect_task, ch);
- }
- /**
- * We encountered an error handling the MQ to the
- * TRANSPORT service. Reconnect.
- *
- * @param cls the `struct GNUNET_TRANSPORT_ApplicationHandle`
- * @param error details about the error
- */
- static void
- error_handler (void *cls, enum GNUNET_MQ_Error error)
- {
- struct GNUNET_TRANSPORT_ApplicationHandle *ch = cls;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "TRANSPORT connection died (code %d), reconnecting\n",
- (int) error);
- force_reconnect (ch);
- }
- /**
- * Transmit request for an address suggestion.
- *
- * @param cls the `struct GNUNET_TRANSPORT_ApplicationHandle`
- * @param peer peer to ask for an address suggestion for
- * @param value the `struct GNUNET_TRANSPORT_SuggestHandle`
- * @return #GNUNET_OK (continue to iterate), #GNUNET_SYSERR on
- * failure (message queue no longer exists)
- */
- static int
- transmit_suggestion (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- void *value)
- {
- struct GNUNET_TRANSPORT_ApplicationHandle *ch = cls;
- struct GNUNET_TRANSPORT_ApplicationSuggestHandle *sh = value;
- struct GNUNET_MQ_Envelope *ev;
- struct ExpressPreferenceMessage *m;
- if (NULL == ch->mq)
- return GNUNET_SYSERR;
- ev = GNUNET_MQ_msg (m, GNUNET_MESSAGE_TYPE_TRANSPORT_SUGGEST);
- m->pk = htonl ((uint32_t) sh->pk);
- m->bw = sh->bw;
- m->peer = *peer;
- GNUNET_MQ_send (ch->mq, ev);
- return GNUNET_OK;
- }
- /**
- * Re-establish the connection to the TRANSPORT service.
- *
- * @param ch handle to use to re-connect.
- */
- static void
- reconnect (struct GNUNET_TRANSPORT_ApplicationHandle *ch)
- {
- static const struct GNUNET_MQ_MessageHandler handlers[] = { { NULL, 0, 0 } };
- GNUNET_assert (NULL == ch->mq);
- ch->mq =
- GNUNET_CLIENT_connect (ch->cfg, "transport", handlers, &error_handler, ch);
- if (NULL == ch->mq)
- {
- force_reconnect (ch);
- return;
- }
- GNUNET_CONTAINER_multipeermap_iterate (ch->sug_requests,
- &transmit_suggestion,
- ch);
- }
- /**
- * Initialize the TRANSPORT application suggestion client handle.
- *
- * @param cfg configuration to use
- * @return transport application handle, NULL on error
- */
- struct GNUNET_TRANSPORT_ApplicationHandle *
- GNUNET_TRANSPORT_application_init (
- const struct GNUNET_CONFIGURATION_Handle *cfg)
- {
- struct GNUNET_TRANSPORT_ApplicationHandle *ch;
- ch = GNUNET_new (struct GNUNET_TRANSPORT_ApplicationHandle);
- ch->cfg = cfg;
- ch->sug_requests = GNUNET_CONTAINER_multipeermap_create (32, GNUNET_YES);
- reconnect (ch);
- return ch;
- }
- /**
- * Function called to free all `struct GNUNET_TRANSPORT_ApplicationSuggestHandle`s
- * in the map.
- *
- * @param cls NULL
- * @param key the key
- * @param value the value to free
- * @return #GNUNET_OK (continue to iterate)
- */
- static int
- free_sug_handle (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
- {
- struct GNUNET_TRANSPORT_ApplicationSuggestHandle *cur = value;
- GNUNET_free (cur);
- return GNUNET_OK;
- }
- /**
- * Client is done with TRANSPORT application management, release resources.
- *
- * @param ch handle to release
- */
- void
- GNUNET_TRANSPORT_application_done (
- struct GNUNET_TRANSPORT_ApplicationHandle *ch)
- {
- if (NULL != ch->mq)
- {
- GNUNET_MQ_destroy (ch->mq);
- ch->mq = NULL;
- }
- if (NULL != ch->task)
- {
- GNUNET_SCHEDULER_cancel (ch->task);
- ch->task = NULL;
- }
- GNUNET_CONTAINER_multipeermap_iterate (ch->sug_requests,
- &free_sug_handle,
- NULL);
- GNUNET_CONTAINER_multipeermap_destroy (ch->sug_requests);
- GNUNET_free (ch);
- }
- /**
- * An application would like TRANSPORT to connect to a peer.
- *
- * @param ch handle
- * @param peer identity of the peer we need an address for
- * @param pk what kind of application will the application require (can be
- * #GNUNET_MQ_PRIO_BACKGROUND, we will still try to connect)
- * @param bw desired bandwith, can be zero (we will still try to connect)
- * @return suggest handle, NULL if a request is already pending
- */
- struct GNUNET_TRANSPORT_ApplicationSuggestHandle *
- GNUNET_TRANSPORT_application_suggest (
- struct GNUNET_TRANSPORT_ApplicationHandle *ch,
- const struct GNUNET_PeerIdentity *peer,
- enum GNUNET_MQ_PriorityPreferences pk,
- struct GNUNET_BANDWIDTH_Value32NBO bw)
- {
- struct GNUNET_TRANSPORT_ApplicationSuggestHandle *s;
- s = GNUNET_new (struct GNUNET_TRANSPORT_ApplicationSuggestHandle);
- s->ch = ch;
- s->id = *peer;
- s->pk = pk;
- s->bw = bw;
- (void) GNUNET_CONTAINER_multipeermap_put (
- ch->sug_requests,
- &s->id,
- s,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Requesting TRANSPORT to suggest address for `%s'\n",
- GNUNET_i2s (peer));
- if (NULL == ch->mq)
- return s;
- GNUNET_assert (GNUNET_OK == transmit_suggestion (ch, &s->id, s));
- return s;
- }
- /**
- * We no longer care about being connected to a peer.
- *
- * @param sh handle to stop
- */
- void
- GNUNET_TRANSPORT_application_suggest_cancel (
- struct GNUNET_TRANSPORT_ApplicationSuggestHandle *sh)
- {
- struct GNUNET_TRANSPORT_ApplicationHandle *ch = sh->ch;
- struct GNUNET_MQ_Envelope *ev;
- struct ExpressPreferenceMessage *m;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Telling TRANSPORT we no longer care for an address for `%s'\n",
- GNUNET_i2s (&sh->id));
- GNUNET_assert (
- GNUNET_OK ==
- GNUNET_CONTAINER_multipeermap_remove (ch->sug_requests, &sh->id, sh));
- if (NULL == ch->mq)
- {
- GNUNET_free (sh);
- return;
- }
- ev = GNUNET_MQ_msg (m, GNUNET_MESSAGE_TYPE_TRANSPORT_SUGGEST_CANCEL);
- m->pk = htonl ((uint32_t) sh->pk);
- m->bw = sh->bw;
- m->peer = sh->id;
- GNUNET_MQ_send (ch->mq, ev);
- GNUNET_free (sh);
- }
- /**
- * An application (or a communicator) has received a HELLO (or other address
- * data of another peer) and wants TRANSPORT to validate that the address is
- * correct. The result is NOT returned, in fact TRANSPORT may do nothing
- * (i.e. if it has too many active validations or recently tried this one
- * already). If the @a addr validates, TRANSPORT will persist the address
- * with PEERSTORE.
- *
- * @param ch handle
- * @param peer identity of the peer we have an address for
- * @param nt network type of @a addr (as claimed by the other peer);
- * used by TRANSPORT to avoid trying @a addr's that really cannot work
- * due to network type missmatches
- * @param addr address to validate
- */
- void
- GNUNET_TRANSPORT_application_validate (
- struct GNUNET_TRANSPORT_ApplicationHandle *ch,
- const struct GNUNET_PeerIdentity *peer,
- enum GNUNET_NetworkType nt,
- const char *addr)
- {
- struct GNUNET_MQ_Envelope *ev;
- struct RequestHelloValidationMessage *m;
- size_t alen;
- if (NULL == ch->mq)
- {
- GNUNET_log (
- GNUNET_ERROR_TYPE_WARNING,
- "Address validation for %s:%s skipped as transport is not connected\n",
- GNUNET_i2s (peer),
- addr);
- return;
- }
- alen = strlen (addr) + 1;
- ev =
- GNUNET_MQ_msg_extra (m,
- alen,
- GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_HELLO_VALIDATION);
- m->peer = *peer;
- m->nt = htonl ((uint32_t) nt);
- memcpy (&m[1], addr, alen);
- GNUNET_MQ_send (ch->mq, ev);
- }
- /* end of transport_api2_application.c */
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