/*
 * Copyright (C) 2003 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include "ipf.h"

char *hostname(v, ip)
int v;
void *ip;
{
        static char hostbuf[MAXHOSTNAMELEN+1];
        struct hostent *hp;
        struct in_addr ipa;
        struct netent *np;

        if (v == 4) {
                ipa.s_addr = *(u_32_t *)ip;
                if (ipa.s_addr == htonl(0xfedcba98))
                        return "test.host.dots";
        }

        if ((opts & OPT_NORESOLVE) == 0) {
                if (v == 4) {
                        hp = gethostbyaddr(ip, 4, AF_INET);
                        if (hp != NULL && hp->h_name != NULL &&
                            *hp->h_name != '\0') {
                                strncpy(hostbuf, hp->h_name, sizeof(hostbuf));
                                hostbuf[sizeof(hostbuf) - 1] = '\0';
                                return hostbuf;
                        }

                        np = getnetbyaddr(ipa.s_addr, AF_INET);
                        if (np != NULL && np->n_name != NULL &&
                            *np->n_name != '\0') {
                                strncpy(hostbuf, np->n_name, sizeof(hostbuf));
                                hostbuf[sizeof(hostbuf) - 1] = '\0';
                                return hostbuf;
                        }
                }
        }

        if (v == 4) {
                return inet_ntoa(ipa);
        }
#ifdef  USE_INET6
        (void) inet_ntop(AF_INET6, ip, hostbuf, sizeof(hostbuf) - 1);
        hostbuf[MAXHOSTNAMELEN] = '\0';
        return hostbuf;
#else
        return "IPv6";
#endif
}