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/*
This file is part of GNUnet
Copyright (C) 2012 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.
*/
/**
* @file include/gnunet_dnsstub_lib.h
* @brief API for helper library to send DNS requests to DNS resolver
* @author Christian Grothoff
*/
#ifndef GNUNET_DNSSTUB_LIB_H
#define GNUNET_DNSSTUB_LIB_H
#include "gnunet_common.h"
#include "gnunet_tun_lib.h"
/**
* Opaque handle to the stub resolver.
*/
struct GNUNET_DNSSTUB_Context;
/**
* Opaque handle to a socket doing UDP requests.
*/
struct GNUNET_DNSSTUB_RequestSocket;
/**
* Start a DNS stub resolver.
*
* @param dns_ip target IP address to use
* @return NULL on error
*/
struct GNUNET_DNSSTUB_Context *
GNUNET_DNSSTUB_start (const char *dns_ip);
/**
* Cleanup DNSSTUB resolver.
*
* @param ctx stub resolver to clean up
*/
void
GNUNET_DNSSTUB_stop (struct GNUNET_DNSSTUB_Context *ctx);
/**
* Function called with the result of a DNS resolution.
*
* @param cls closure
* @param rs socket that received the response
* @param dns dns response, never NULL
* @param dns_len number of bytes in 'dns'
*/
typedef void (*GNUNET_DNSSTUB_ResultCallback)(void *cls,
struct GNUNET_DNSSTUB_RequestSocket *rs,
const struct GNUNET_TUN_DnsHeader *dns,
size_t dns_len);
/**
* Perform DNS resolution using given address.
*
* @param ctx stub resolver to use
* @param sa the socket address
* @param sa_len the socket length
* @param request DNS request to transmit
* @param request_len number of bytes in msg
* @param rc function to call with result
* @param rc_cls closure for 'rc'
* @return socket used for the request, NULL on error
*/
struct GNUNET_DNSSTUB_RequestSocket *
GNUNET_DNSSTUB_resolve (struct GNUNET_DNSSTUB_Context *ctx,
const struct sockaddr *sa,
socklen_t sa_len,
const void *request,
size_t request_len,
GNUNET_DNSSTUB_ResultCallback rc,
void *rc_cls);
/**
* Perform DNS resolution using our default IP from init.
*
* @param ctx stub resolver to use
* @param request DNS request to transmit
* @param request_len number of bytes in msg
* @param rc function to call with result
* @param rc_cls closure for 'rc'
* @return socket used for the request, NULL on error
*/
struct GNUNET_DNSSTUB_RequestSocket *
GNUNET_DNSSTUB_resolve2 (struct GNUNET_DNSSTUB_Context *ctx,
const void *request,
size_t request_len,
GNUNET_DNSSTUB_ResultCallback rc,
void *rc_cls);
/**
* Cancel DNS resolution.
*
* @param rs resolution to cancel
*/
void
GNUNET_DNSSTUB_resolve_cancel (struct GNUNET_DNSSTUB_RequestSocket *rs);
#endif
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