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- /*
- This file is part of GNUnet
- Copyright (C) 2012, 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 regex/regex_api_announce.c
- * @brief access regex service to advertise capabilities via regex
- * @author Maximilian Szengel
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_protocols.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_regex_service.h"
- #include "regex_ipc.h"
- #define LOG(kind, ...) GNUNET_log_from (kind, "regex-api", __VA_ARGS__)
- /**
- * Handle to store cached data about a regex announce.
- */
- struct GNUNET_REGEX_Announcement
- {
- /**
- * Connection to the regex service.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Our configuration.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Message we're sending to the service.
- */
- char *regex;
- /**
- * Frequency of announcements.
- */
- struct GNUNET_TIME_Relative refresh_delay;
- /**
- * Number of characters per edge.
- */
- uint16_t compression;
- };
- /**
- * (Re)connect to the REGEX service with the given announcement @a a.
- *
- * @param a REGEX to announce.
- */
- static void
- announce_reconnect (struct GNUNET_REGEX_Announcement *a);
- /**
- * We got a disconnect after asking regex to do the announcement.
- * Retry.
- *
- * @param cls the `struct GNUNET_REGEX_Announcement` to retry
- * @param error error code
- */
- static void
- announce_mq_error_handler (void *cls,
- enum GNUNET_MQ_Error error)
- {
- struct GNUNET_REGEX_Announcement *a = cls;
- GNUNET_MQ_destroy (a->mq);
- a->mq = NULL;
- announce_reconnect (a);
- }
- /**
- * (Re)connect to the REGEX service with the given announcement @a a.
- *
- * @param a REGEX to announce.
- */
- static void
- announce_reconnect (struct GNUNET_REGEX_Announcement *a)
- {
- struct GNUNET_MQ_Envelope *env;
- struct AnnounceMessage *am;
- size_t slen;
- a->mq = GNUNET_CLIENT_connect (a->cfg,
- "regex",
- NULL,
- &announce_mq_error_handler,
- a);
- if (NULL == a->mq)
- return;
- slen = strlen (a->regex) + 1;
- env = GNUNET_MQ_msg_extra (am,
- slen,
- GNUNET_MESSAGE_TYPE_REGEX_ANNOUNCE);
- am->compression = htons (a->compression);
- am->reserved = htons (0);
- am->refresh_delay = GNUNET_TIME_relative_hton (a->refresh_delay);
- GNUNET_memcpy (&am[1],
- a->regex,
- slen);
- GNUNET_MQ_send (a->mq,
- env);
- }
- /**
- * Announce the given peer under the given regular expression.
- *
- * @param cfg configuration to use
- * @param regex Regular expression to announce.
- * @param refresh_delay after what delay should the announcement be repeated?
- * @param compression How many characters per edge can we squeeze?
- * @return Handle to reuse o free cached resources.
- * Must be freed by calling #GNUNET_REGEX_announce_cancel().
- */
- struct GNUNET_REGEX_Announcement *
- GNUNET_REGEX_announce (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const char *regex,
- struct GNUNET_TIME_Relative refresh_delay,
- uint16_t compression)
- {
- struct GNUNET_REGEX_Announcement *a;
- size_t slen;
- slen = strlen (regex) + 1;
- if (slen + sizeof(struct AnnounceMessage) >= GNUNET_MAX_MESSAGE_SIZE)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _ ("Regex `%s' is too long!\n"),
- regex);
- GNUNET_break (0);
- return NULL;
- }
- a = GNUNET_new (struct GNUNET_REGEX_Announcement);
- a->cfg = cfg;
- a->refresh_delay = refresh_delay;
- a->compression = compression;
- a->regex = GNUNET_strdup (regex);
- announce_reconnect (a);
- if (NULL == a->mq)
- {
- GNUNET_free (a->regex);
- GNUNET_free (a);
- return NULL;
- }
- return a;
- }
- /**
- * Stop announcing the regex specified by the given handle.
- *
- * @param a handle returned by a previous #GNUNET_REGEX_announce() call.
- */
- void
- GNUNET_REGEX_announce_cancel (struct GNUNET_REGEX_Announcement *a)
- {
- GNUNET_MQ_destroy (a->mq);
- GNUNET_free (a->regex);
- GNUNET_free (a);
- }
- /* end of regex_api_announce.c */
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