1/*	$OpenBSD: getaddrinfo.c,v 1.9 2015/10/08 14:08:44 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
27int
28getaddrinfo(const char *hostname, const char *servname,
29    const struct addrinfo *hints, struct addrinfo **res)
30{
31	struct asr_query *as;
32	struct asr_result ar;
33	int		 saved_errno = errno;
34
35	if (hints == NULL || (hints->ai_flags & AI_NUMERICHOST) == 0)
36		res_init();
37
38	as = getaddrinfo_async(hostname, servname, hints, NULL);
39	if (as == NULL) {
40		if (errno == ENOMEM) {
41			errno = saved_errno;
42			return (EAI_MEMORY);
43		}
44		return (EAI_SYSTEM);
45	}
46
47	asr_run_sync(as, &ar);
48
49	*res = ar.ar_addrinfo;
50	if (ar.ar_gai_errno == EAI_SYSTEM)
51		errno = ar.ar_errno;
52
53	return (ar.ar_gai_errno);
54}
55DEF_WEAK(getaddrinfo);
56