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/*
This file is part of GNUnet.
Copyright (C) 2001-2013 GNUnet e.V.
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 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.
*/
/**
* @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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