/*      $OpenBSD: res_query.c,v 1.9 2015/10/05 02:57:16 guenther 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);
}
DEF_WEAK(res_query);

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);
}