rewrite local address detection code, to use getifaddrs(3), not gethostname(3).
gethostname(3) do not necessarily represent local host addrses. pointed out by: Chuck Cranor
This commit is contained in:
itojun
parent
14e83027c8
commit
f714bfb0d8
@ -1,4 +1,4 @@
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/* $NetBSD: common.c,v 1.20 2000/04/25 02:34:49 itojun Exp $ */
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/* $NetBSD: common.c,v 1.21 2000/08/09 14:28:50 itojun Exp $ */
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/*
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* Copyright (c) 1983, 1993
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@ -43,7 +43,7 @@
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#if 0
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static char sccsid[] = "@(#)common.c 8.5 (Berkeley) 4/28/95";
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#else
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__RCSID("$NetBSD: common.c,v 1.20 2000/04/25 02:34:49 itojun Exp $");
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__RCSID("$NetBSD: common.c,v 1.21 2000/08/09 14:28:50 itojun Exp $");
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#endif
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#endif /* not lint */
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@ -62,6 +62,7 @@ __RCSID("$NetBSD: common.c,v 1.20 2000/04/25 02:34:49 itojun Exp $");
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ifaddrs.h>
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#include "lp.h"
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#include "pathnames.h"
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@ -303,68 +304,91 @@ compar(p1, p2)
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/*
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* Figure out whether the local machine is the same
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* as the remote machine (RM) entry (if it exists).
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*
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* XXX not really the right way to determine.
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*/
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char *
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checkremote()
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{
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char hname[NI_MAXHOST];
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struct addrinfo hints, *res;
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char lname[NI_MAXHOST], rname[NI_MAXHOST];
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struct addrinfo hints, *res, *res0;
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static char errbuf[128];
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int error;
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struct ifaddrs *ifap, *ifa;
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#ifdef NI_WITHSCOPEID
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const int niflags = NI_NUMERICHOST | NI_WITHSCOPEID;
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#else
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const int niflags = NI_NUMERICHOST;
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#endif
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#ifdef __KAME__
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struct sockaddr_in6 sin6;
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struct sockaddr_in6 *sin6p;
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#endif
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remote = 0; /* assume printer is local */
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if (RM != NULL) {
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/* get the official name of the local host */
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gethostname(hname, sizeof(hname));
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hname[sizeof(hname)-1] = '\0';
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remote = 0; /* assume printer is local on failure */
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memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_CANONNAME;
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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res = NULL;
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error = getaddrinfo(hname, NULL, &hints, &res);
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if (error || !res->ai_canonname) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"unable to get official name for local machine %s: "
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"%s", hname, gai_strerror(error));
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if (res)
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freeaddrinfo(res);
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return errbuf;
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} else {
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(void)strncpy(hname, res->ai_canonname,
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sizeof(hname) - 1);
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hname[sizeof(hname) - 1] = '\0';
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}
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freeaddrinfo(res);
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if (RM == NULL)
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return NULL;
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/* get the official name of RM */
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memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_CANONNAME;
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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res = NULL;
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error = getaddrinfo(RM, NULL, &hints, &res);
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if (error || !res->ai_canonname) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"unable to get official name for local machine %s: "
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"%s", RM, gai_strerror(error));
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if (res)
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freeaddrinfo(res);
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return errbuf;
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}
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/*
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* if the two hosts are not the same,
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* then the printer must be remote.
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*/
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if (strcasecmp(hname, res->ai_canonname) != 0)
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remote = 1;
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freeaddrinfo(res);
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/* get the local interface addresses */
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if (getifaddrs(&ifap) < 0) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"unable to get local interface address: %s",
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strerror(errno));
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return errbuf;
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}
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/* get the remote host addresses (RM) */
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memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_CANONNAME;
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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res = NULL;
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error = getaddrinfo(RM, NULL, &hints, &res0);
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if (error) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"unable to resolve remote machine %s: %s",
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RM, gai_strerror(error));
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freeifaddrs(ifap);
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return errbuf;
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}
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remote = 1; /* assume printer is remote */
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for (res = res0; res; res = res->ai_next) {
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if (getnameinfo(res->ai_addr, res->ai_addrlen,
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rname, sizeof(rname), NULL, 0, niflags) != 0)
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continue;
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for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
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#ifdef __KAME__
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sin6p = (struct sockaddr_in6 *)ifa->ifa_addr;
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if (ifa->ifa_addr->sa_family == AF_INET6 &&
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ifa->ifa_addr->sa_len == sizeof(sin6) &&
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IN6_IS_ADDR_LINKLOCAL(&sin6p->sin6_addr) &&
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*(u_int16_t *)&sin6p->sin6_addr.s6_addr[2]) {
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/* kame scopeid hack */
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memcpy(&sin6, ifa->ifa_addr, sizeof(sin6));
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sin6.sin6_scope_id =
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ntohs(*(u_int16_t *)&sin6p->sin6_addr.s6_addr[2]);
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sin6.sin6_addr.s6_addr[2] = 0;
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sin6.sin6_addr.s6_addr[3] = 0;
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if (getnameinfo((struct sockaddr *)&sin6,
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sin6.sin6_len, lname, sizeof(lname),
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NULL, 0, niflags) != 0)
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continue;
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} else
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#endif
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if (getnameinfo(ifa->ifa_addr, ifa->ifa_addr->sa_len,
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lname, sizeof(lname), NULL, 0, niflags) != 0)
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continue;
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if (strcmp(rname, lname) == 0) {
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remote = 0;
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goto done;
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}
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}
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}
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done:
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freeaddrinfo(res0);
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freeifaddrs(ifap);
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return NULL;
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}
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