getdns/src/sync.c

/**
 *
 * /brief getdns core functions for synchronous use
 *
 * Originally taken from the getdns API description pseudo implementation.
 *
 */

/*
 * Copyright (c) 2013, Versign, Inc.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the <organization> nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Verisign, Inc. BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <getdns/getdns.h>
#include <event2/event.h>
#include <unbound-event.h>
#include "context.h"
#include "general.h"
#include "util-internal.h"
#include <string.h>

/* stuff to make it compile pedantically */
#define UNUSED_PARAM(x) ((void)(x))

static void sync_callback_func(getdns_context_t context,
                               uint16_t callback_type,
                               struct getdns_dict *response,
                               void *userarg,
                               getdns_transaction_t transaction_id) {

    *((getdns_dict **)userarg) = response;
}

getdns_return_t
getdns_general_sync(
  getdns_context_t       context,
  const char             *name,
  uint16_t               request_type,
  struct getdns_dict     *extensions,
  uint32_t               *response_length,
  struct getdns_dict     **response
)
{
    getdns_return_t response_status;

    response_status = validate_extensions(extensions);
    if (response_status == GETDNS_RETURN_GOOD) {
        response_status = getdns_general_ub(context->unbound_sync,
                                            context->event_base_sync,
                                            context, name, request_type,
                                            extensions, (void *)response,
                                            NULL, sync_callback_func);

        event_base_dispatch(context->event_base_sync);
    }
    return response_status;
}

getdns_return_t
getdns_address_sync(
  getdns_context_t       context,
  const char             *name,
  struct getdns_dict     *extensions,
  uint32_t               *response_length,
  struct getdns_dict     **response
)
{
    int cleanup_extensions = 0;
    if (!extensions) {
        extensions = getdns_dict_create();
        cleanup_extensions = 1;
    }
    getdns_dict_set_int(extensions,
                        GETDNS_STR_EXTENSION_RETURN_BOTH_V4_AND_V6,
                        GETDNS_EXTENSION_TRUE);

    getdns_return_t result =
    getdns_general_sync(context, name, GETDNS_RRTYPE_A,
                        extensions, response_length, response);
    if (cleanup_extensions) {
        getdns_dict_destroy(extensions);
    }
    return result;
}

getdns_return_t
getdns_hostname_sync(
  getdns_context_t       context,
  struct getdns_dict     *address,
  struct getdns_dict     *extensions,
  uint32_t               *response_length,
  struct getdns_dict     **response
)
{
    struct getdns_bindata *address_data;
    struct getdns_bindata *address_type;
    uint16_t req_type;
    char *name;
    getdns_return_t retval;


    if ((retval = getdns_dict_get_bindata(address, "address_data", &address_data)) != GETDNS_RETURN_GOOD)
        return retval;
    if ((retval = getdns_dict_get_bindata(address, "address_type", &address_type)) != GETDNS_RETURN_GOOD)
        return retval;
    if ((strncmp(GETDNS_STR_IPV4, (char *)address_type->data, strlen(GETDNS_STR_IPV4)) == 0) ||
        (strncmp(GETDNS_STR_IPV6, (char *)address_type->data, strlen(GETDNS_STR_IPV6)) == 0))
        req_type = GETDNS_RRTYPE_PTR;
    else
        return GETDNS_RETURN_WRONG_TYPE_REQUESTED;
    if ((name = reverse_address((char *)address_data)) == 0)
        return GETDNS_RETURN_GENERIC_ERROR;
    return getdns_general_sync(context, name, req_type, extensions,
                        response_length, response);
}


getdns_return_t
getdns_service_sync(
  getdns_context_t       context,
  const char             *name,
  struct getdns_dict     *extensions,
  uint32_t               *response_length,
  struct getdns_dict     **response
)
{

    return getdns_general_sync(context, name, GETDNS_RRTYPE_SRV, extensions,
                               response_length, response);

}

void
getdns_free_sync_request_memory(
  struct getdns_dict     *response
)
{
    getdns_dict_destroy(response);
}
/* getdns_core_sync.c */