1 /* $OpenBSD: res_send.c,v 1.8 2014/03/26 18:13:15 eric Exp $ */
2 /*
3 * Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include <sys/types.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <netdb.h>
22
23 #include <asr.h>
24 #include <errno.h>
25 #include <resolv.h>
26 #include <string.h>
27 #include <stdlib.h>
28
29 int
res_send(const u_char * buf,int buflen,u_char * ans,int anslen)30 res_send(const u_char *buf, int buflen, u_char *ans, int anslen)
31 {
32 struct asr_query *as;
33 struct asr_result ar;
34 size_t len;
35
36 res_init();
37
38 if (ans == NULL || anslen <= 0) {
39 errno = EINVAL;
40 return (-1);
41 }
42
43 as = res_send_async(buf, buflen, NULL);
44 if (as == NULL)
45 return (-1); /* errno set */
46
47 asr_run_sync(as, &ar);
48
49 if (ar.ar_errno) {
50 errno = ar.ar_errno;
51 return (-1);
52 }
53
54 len = anslen;
55 if (ar.ar_datalen < len)
56 len = ar.ar_datalen;
57 memmove(ans, ar.ar_data, len);
58 free(ar.ar_data);
59
60 return (ar.ar_datalen);
61 }
62