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- /*
- This file is part of GNUnet.
- Copyright (C) 2001, 2002, 2004, 2005, 2007, 2009, 2010 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 peerinfo/peerinfo_api_notify.c
- * @brief notify API to access peerinfo service
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_peerinfo_service.h"
- #include "gnunet_protocols.h"
- #include "peerinfo.h"
- #define LOG(kind,...) GNUNET_log_from (kind, "peerinfo-api",__VA_ARGS__)
- /**
- * Context for the info handler.
- */
- struct GNUNET_PEERINFO_NotifyContext
- {
- /**
- * Our connection to the PEERINFO service.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Function to call with information.
- */
- GNUNET_PEERINFO_Processor callback;
- /**
- * Closure for @e callback.
- */
- void *callback_cls;
- /**
- * Configuration.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Tasked used for delayed re-connection attempt.
- */
- struct GNUNET_SCHEDULER_Task *task;
- /**
- * Include friend only HELLOs in callbacks
- */
- int include_friend_only;
- };
- /**
- * Task to re-try connecting to peerinfo.
- *
- * @param cls the `struct GNUNET_PEERINFO_NotifyContext *`
- */
- static void
- reconnect (void *cls);
- /**
- * We encountered an error, reconnect to the service.
- *
- * @param nc context to reconnect
- */
- static void
- do_reconnect (struct GNUNET_PEERINFO_NotifyContext *nc)
- {
- GNUNET_MQ_destroy (nc->mq);
- nc->mq = NULL;
- nc->task = GNUNET_SCHEDULER_add_now (&reconnect,
- nc);
- }
- /**
- * We got a disconnect after asking regex to do the announcement.
- * Retry.
- *
- * @param cls the `struct GNUNET_PEERINFO_NotifyContext` to retry
- * @param error error code
- */
- static void
- mq_error_handler (void *cls,
- enum GNUNET_MQ_Error error)
- {
- struct GNUNET_PEERINFO_NotifyContext *nc = cls;
- do_reconnect (nc);
- }
- /**
- * Check that a peerinfo information message is well-formed.
- *
- * @param cls closure
- * @param im message received
- * @return #GNUNET_OK if the message is well-formed
- */
- static int
- check_notification (void *cls,
- const struct InfoMessage *im)
- {
- uint16_t ms = ntohs (im->header.size) - sizeof (*im);
- if (ms >= sizeof (struct GNUNET_MessageHeader))
- {
- const struct GNUNET_HELLO_Message *hello;
- hello = (const struct GNUNET_HELLO_Message *) &im[1];
- if (ms != GNUNET_HELLO_size (hello))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
- }
- if (0 != ms)
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK; /* odd... */
- }
- /**
- * Receive a peerinfo information message, process it.
- *
- * @param cls closure
- * @param im message received
- */
- static void
- handle_notification (void *cls,
- const struct InfoMessage *im)
- {
- struct GNUNET_PEERINFO_NotifyContext *nc = cls;
- const struct GNUNET_HELLO_Message *hello;
- uint16_t ms = ntohs (im->header.size) - sizeof (struct InfoMessage);
- if (0 == ms)
- return;
- hello = (const struct GNUNET_HELLO_Message *) &im[1];
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received information about peer `%s' from peerinfo database\n",
- GNUNET_i2s (&im->peer));
- nc->callback (nc->callback_cls,
- &im->peer,
- hello,
- NULL);
- }
- /**
- * Type of a function to call when we receive a message from the
- * service. Call the iterator with the result and (if applicable)
- * continue to receive more messages or trigger processing the next
- * event (if applicable).
- *
- * @param cls closure
- * @param msg message received, NULL on timeout or fatal error
- */
- static void
- handle_end_iteration (void *cls,
- const struct GNUNET_MessageHeader *msg)
- {
- /* these are ignored by the notify API */
- }
- /**
- * Task to re-try connecting to peerinfo.
- *
- * @param cls the `struct GNUNET_PEERINFO_NotifyContext *`
- */
- static void
- reconnect (void *cls)
- {
- struct GNUNET_PEERINFO_NotifyContext *nc = cls;
- struct GNUNET_MQ_MessageHandler handlers[] = {
- GNUNET_MQ_hd_var_size (notification,
- GNUNET_MESSAGE_TYPE_PEERINFO_INFO,
- struct InfoMessage,
- nc),
- GNUNET_MQ_hd_fixed_size (end_iteration,
- GNUNET_MESSAGE_TYPE_PEERINFO_INFO_END,
- struct GNUNET_MessageHeader,
- nc),
- GNUNET_MQ_handler_end ()
- };
- struct GNUNET_MQ_Envelope *env;
- struct NotifyMessage *nm;
- nc->task = NULL;
- nc->mq = GNUNET_CLIENT_connect (nc->cfg,
- "peerinfo",
- handlers,
- &mq_error_handler,
- nc);
- if (NULL == nc->mq)
- return;
- env = GNUNET_MQ_msg (nm,
- GNUNET_MESSAGE_TYPE_PEERINFO_NOTIFY);
- nm->include_friend_only = htonl (nc->include_friend_only);
- GNUNET_MQ_send (nc->mq,
- env);
- }
- /**
- * Call a method whenever our known information about peers
- * changes. Initially calls the given function for all known
- * peers and then only signals changes.
- *
- * If @a include_friend_only is set to #GNUNET_YES peerinfo will include HELLO
- * messages which are intended for friend to friend mode and which do not
- * have to be gossiped. Otherwise these messages are skipped.
- *
- * @param cfg configuration to use
- * @param include_friend_only include HELLO messages for friends only
- * @param callback the method to call for each peer
- * @param callback_cls closure for @a callback
- * @return NULL on error
- */
- struct GNUNET_PEERINFO_NotifyContext *
- GNUNET_PEERINFO_notify (const struct GNUNET_CONFIGURATION_Handle *cfg,
- int include_friend_only,
- GNUNET_PEERINFO_Processor callback,
- void *callback_cls)
- {
- struct GNUNET_PEERINFO_NotifyContext *nc;
- nc = GNUNET_new (struct GNUNET_PEERINFO_NotifyContext);
- nc->cfg = cfg;
- nc->callback = callback;
- nc->callback_cls = callback_cls;
- nc->include_friend_only = include_friend_only;
- reconnect (nc);
- if (NULL == nc->mq)
- {
- LOG (GNUNET_ERROR_TYPE_WARNING,
- "Could not connect to PEERINFO service.\n");
- GNUNET_free (nc);
- return NULL;
- }
- return nc;
- }
- /**
- * Stop notifying about changes.
- *
- * @param nc context to stop notifying
- */
- void
- GNUNET_PEERINFO_notify_cancel (struct GNUNET_PEERINFO_NotifyContext *nc)
- {
- if (NULL != nc->mq)
- {
- GNUNET_MQ_destroy (nc->mq);
- nc->mq = NULL;
- }
- if (NULL != nc->task)
- {
- GNUNET_SCHEDULER_cancel (nc->task);
- nc->task = NULL;
- }
- GNUNET_free (nc);
- }
- /* end of peerinfo_api_notify.c */
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