File: res_query.c

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/*	$OpenBSD: res_query.c,v 1.8 2014/03/26 18:13:15 eric Exp $	*/
/*
 * Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#include <asr.h>
#include <errno.h>
#include <resolv.h>
#include <string.h>
#include <stdlib.h>

int
res_query(const char *name, int class, int type, u_char *ans, int anslen)
{
	struct asr_query *as;
	struct asr_result ar;
	size_t		 len;

	res_init();

	if (ans == NULL || anslen <= 0) {
		h_errno = NO_RECOVERY;
		errno = EINVAL;
		return (-1);
	}

	as = res_query_async(name, class, type, NULL);
	if (as == NULL) {
		if (errno == EINVAL)
			h_errno = NO_RECOVERY;
		else
			h_errno = NETDB_INTERNAL;
		return (-1); /* errno set */
	}

	asr_run_sync(as, &ar);

	if (ar.ar_errno)
		errno = ar.ar_errno;
	h_errno = ar.ar_h_errno;

	if (ar.ar_h_errno != NETDB_SUCCESS)
		return (-1);

	len = anslen;
	if (ar.ar_datalen < len)
		len = ar.ar_datalen;
	memmove(ans, ar.ar_data, len);
	free(ar.ar_data);

	return (ar.ar_datalen);
}

int
res_search(const char *name, int class, int type, u_char *ans, int anslen)
{
	struct asr_query *as;
	struct asr_result ar;
	size_t		 len;

	res_init();

	if (ans == NULL || anslen <= 0) {
		h_errno = NO_RECOVERY;
		errno = EINVAL;
		return (-1);
	}

	as = res_search_async(name, class, type, NULL);
	if (as == NULL) {
		if (errno == EINVAL)
			h_errno = NO_RECOVERY;
		else
			h_errno = NETDB_INTERNAL;
		return (-1); /* errno set */
	}

	asr_run_sync(as, &ar);

	if (ar.ar_errno)
		errno = ar.ar_errno;
	h_errno = ar.ar_h_errno;

	if (ar.ar_h_errno != NETDB_SUCCESS)
		return (-1);

	len = anslen;
	if (ar.ar_datalen < len)
		len = ar.ar_datalen;
	memmove(ans, ar.ar_data, len);
	free(ar.ar_data);

	return (ar.ar_datalen);
}