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- /*
- This file is part of GNUnet.
- Copyright (C) 2001-2013 Christian Grothoff (and other contributing authors)
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, 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
- General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
- */
- /**
- * @author Christian Grothoff
- *
- * @file
- * Functions related to doing DNS lookups
- *
- * @defgroup resolver Resolver service
- * Asynchronous standard DNS lookups
- * @{
- */
- #ifndef GNUNET_RESOLVER_SERVICE_H
- #define GNUNET_RESOLVER_SERVICE_H
- #ifdef __cplusplus
- extern "C"
- {
- #if 0 /* keep Emacsens' auto-indent happy */
- }
- #endif
- #endif
- #include "gnunet_configuration_lib.h"
- #include "gnunet_scheduler_lib.h"
- #include "gnunet_time_lib.h"
- /**
- * Function called by the resolver for each address obtained from DNS.
- *
- * @param cls closure
- * @param addr one of the addresses of the host, NULL for the last address
- * @param addrlen length of @a addr
- */
- typedef void
- (*GNUNET_RESOLVER_AddressCallback) (void *cls,
- const struct sockaddr *addr,
- socklen_t addrlen);
- /**
- * Handle to a request given to the resolver. Can be used to cancel
- * the request prior to the timeout or successful execution.
- */
- struct GNUNET_RESOLVER_RequestHandle;
- /**
- * Create the connection to the resolver service.
- *
- * @param cfg configuration to use
- */
- void
- GNUNET_RESOLVER_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
- /**
- * Destroy the connection to the resolver service.
- */
- void
- GNUNET_RESOLVER_disconnect (void);
- /**
- * Convert a string to one or more IP addresses.
- *
- * @param hostname the hostname to resolve
- * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
- * @param callback function to call with addresses
- * @param callback_cls closure for @a callback
- * @param timeout how long to try resolving
- * @return handle that can be used to cancel the request, NULL on error
- */
- struct GNUNET_RESOLVER_RequestHandle *
- GNUNET_RESOLVER_ip_get (const char *hostname,
- int af,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_RESOLVER_AddressCallback callback,
- void *callback_cls);
- /**
- * Resolve our hostname to an IP address.
- *
- * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
- * @param callback function to call with addresses
- * @param cls closure for @a callback
- * @param timeout how long to try resolving
- * @return handle that can be used to cancel the request, NULL on error
- */
- struct GNUNET_RESOLVER_RequestHandle *
- GNUNET_RESOLVER_hostname_resolve (int af,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_RESOLVER_AddressCallback callback,
- void *cls);
- /**
- * Function called by the resolver for each hostname obtained from DNS.
- *
- * @param cls closure
- * @param hostname one of the names for the host, NULL
- * on the last call to the callback
- */
- typedef void
- (*GNUNET_RESOLVER_HostnameCallback) (void *cls,
- const char *hostname);
- /**
- * Get local fully qualified domain name
- *
- * @return local hostname, caller must free
- */
- char *
- GNUNET_RESOLVER_local_fqdn_get (void);
- /**
- * Perform a reverse DNS lookup.
- *
- * @param sa host address
- * @param salen length of @a sa
- * @param do_resolve use #GNUNET_NO to return numeric hostname
- * @param timeout how long to try resolving
- * @param callback function to call with hostnames
- * @param cls closure for @a callback
- * @return handle that can be used to cancel the request, NULL on error
- */
- struct GNUNET_RESOLVER_RequestHandle *
- GNUNET_RESOLVER_hostname_get (const struct sockaddr *sa,
- socklen_t salen,
- int do_resolve,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_RESOLVER_HostnameCallback callback,
- void *cls);
- /**
- * Cancel a request that is still pending with the resolver.
- * Note that a client MUST NOT cancel a request that has
- * been completed (i.e, the callback has been called to
- * signal timeout or the final result).
- *
- * @param rh handle of request to cancel
- */
- void
- GNUNET_RESOLVER_request_cancel (struct GNUNET_RESOLVER_RequestHandle *rh);
- #if 0 /* keep Emacsens' auto-indent happy */
- {
- #endif
- #ifdef __cplusplus
- }
- #endif
- /* ifndef GNUNET_RESOLVER_SERVICE_H */
- #endif
- /** @} */ /* end of group resolver */
- /* end of gnunet_resolver_service.h */
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