1 /* $NetBSD: hostname.c,v 1.3 2012/10/22 01:21:57 christos 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
13 char *
hostname(int family,const void * ip)14 hostname(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