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