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/* $OpenBSD: res_send.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_send(const u_char *buf, int buflen, u_char *ans, int anslen)
{
struct asr_query *as;
struct asr_result ar;
size_t len;
res_init();
if (ans == NULL || anslen <= 0) {
errno = EINVAL;
return (-1);
}
as = res_send_async(buf, buflen, NULL);
if (as == NULL)
return (-1); /* errno set */
asr_run_sync(as, &ar);
if (ar.ar_errno) {
errno = ar.ar_errno;
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);
}
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