52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
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/* $NetBSD: hostname.c,v 1.1.1.1 2004/03/28 08:56:18 martti Exp $ */
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#include "ipf.h"
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char *hostname(v, ip)
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int v;
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void *ip;
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{
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static char hostbuf[MAXHOSTNAMELEN+1];
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struct hostent *hp;
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struct in_addr ipa;
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struct netent *np;
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if (v == 4) {
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ipa.s_addr = *(u_32_t *)ip;
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if (ipa.s_addr == htonl(0xfedcba98))
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return "test.host.dots";
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}
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if ((opts & OPT_NORESOLVE) == 0) {
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if (v == 4) {
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hp = gethostbyaddr(ip, 4, AF_INET);
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if (hp != NULL && hp->h_name != NULL &&
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*hp->h_name != '\0') {
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strncpy(hostbuf, hp->h_name, sizeof(hostbuf));
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hostbuf[sizeof(hostbuf) - 1] = '\0';
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return hostbuf;
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}
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np = getnetbyaddr(ipa.s_addr, AF_INET);
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if (np != NULL && np->n_name != NULL &&
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*np->n_name != '\0') {
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strncpy(hostbuf, np->n_name, sizeof(hostbuf));
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hostbuf[sizeof(hostbuf) - 1] = '\0';
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return hostbuf;
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}
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}
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}
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if (v == 4) {
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return inet_ntoa(ipa);
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}
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#ifdef USE_INET6
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(void) inet_ntop(AF_INET6, ip, hostbuf, sizeof(hostbuf) - 1);
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hostbuf[MAXHOSTNAMELEN] = '\0';
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return hostbuf;
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#else
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return "IPv6";
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#endif
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}
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