1 /* $NetBSD: hostname.c,v 1.1.1.2 2012/07/22 13:44:38 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 13 char *hostname(family, ip) 14 int family; 15 void *ip; 16 { 17 static char hostbuf[MAXHOSTNAMELEN+1]; 18 struct hostent *hp; 19 struct in_addr ipa; 20 struct netent *np; 21 22 memset(&ipa, 0, sizeof(ipa)); /* XXX gcc */ 23 24 if (family == AF_INET) { 25 ipa.s_addr = *(u_32_t *)ip; 26 if (ipa.s_addr == htonl(0xfedcba98)) 27 return "test.host.dots"; 28 } 29 30 if ((opts & OPT_NORESOLVE) == 0) { 31 if (family == AF_INET) { 32 hp = gethostbyaddr(ip, 4, AF_INET); 33 if (hp != NULL && hp->h_name != NULL && 34 *hp->h_name != '\0') { 35 strncpy(hostbuf, hp->h_name, sizeof(hostbuf)); 36 hostbuf[sizeof(hostbuf) - 1] = '\0'; 37 return hostbuf; 38 } 39 40 np = getnetbyaddr(ipa.s_addr, AF_INET); 41 if (np != NULL && np->n_name != NULL && 42 *np->n_name != '\0') { 43 strncpy(hostbuf, np->n_name, sizeof(hostbuf)); 44 hostbuf[sizeof(hostbuf) - 1] = '\0'; 45 return hostbuf; 46 } 47 } 48 } 49 50 if (family == AF_INET) { 51 return inet_ntoa(ipa); 52 } 53 #ifdef USE_INET6 54 (void) inet_ntop(AF_INET6, ip, hostbuf, sizeof(hostbuf) - 1); 55 hostbuf[MAXHOSTNAMELEN] = '\0'; 56 return hostbuf; 57 #else 58 return "IPv6"; 59 #endif 60 } 61