1/*	$NetBSD: hostname.c,v 1.2 2012/07/22 14:27:36 darrenr Exp $	*/
2
3/*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 * Id: hostname.c,v 1.1.1.2 2012/07/22 13:44:38 darrenr Exp $
9 */
10
11#include "ipf.h"
12
13char *
14hostname(int family, const void *ip)
15{
16	static char hostbuf[MAXHOSTNAMELEN+1];
17	struct hostent *hp;
18	struct in_addr ipa;
19	struct netent *np;
20
21	memset(&ipa, 0, sizeof(ipa));	/* XXX gcc */
22
23	if (family == AF_INET) {
24		ipa.s_addr = *(const u_32_t *)ip;
25		if (ipa.s_addr == htonl(0xfedcba98))
26			return "test.host.dots";
27	}
28
29	if ((opts & OPT_NORESOLVE) == 0) {
30		if (family == AF_INET) {
31			hp = gethostbyaddr(ip, 4, AF_INET);
32			if (hp != NULL && hp->h_name != NULL &&
33			    *hp->h_name != '\0') {
34				strncpy(hostbuf, hp->h_name, sizeof(hostbuf));
35				hostbuf[sizeof(hostbuf) - 1] = '\0';
36				return hostbuf;
37			}
38
39			np = getnetbyaddr(ipa.s_addr, AF_INET);
40			if (np != NULL && np->n_name != NULL &&
41			    *np->n_name != '\0') {
42				strncpy(hostbuf, np->n_name, sizeof(hostbuf));
43				hostbuf[sizeof(hostbuf) - 1] = '\0';
44				return hostbuf;
45			}
46		}
47	}
48
49	if (family == AF_INET) {
50		return inet_ntoa(ipa);
51	}
52#ifdef  USE_INET6
53	(void) inet_ntop(AF_INET6, ip, hostbuf, sizeof(hostbuf) - 1);
54	hostbuf[MAXHOSTNAMELEN] = '\0';
55	return hostbuf;
56#else
57	return "IPv6";
58#endif
59}
60