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