/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <libintl.h>
static int is_local_if(struct hostent *hp);
/*
* Given a host name, check to see if it points to the local host.
* If it does, return 1, else return 0.
*
* The strategy is this: translate the host name argument to a list of
* addresses. Then compare each of those addresses to the addresses of
* network interfaces on this host.
*/
int
is_local_host(char *host)
{
struct hostent *hp;
int err;
int flags = AI_DEFAULT;
if (hp = getipnodebyname((const char *) host, AF_INET, flags, &err))
if (is_local_if(hp))
return (1);
if (hp = getipnodebyname((const char *) host, AF_INET6, flags, &err))
if (is_local_if(hp))
return (1);
return (0);
}
static int
is_local_if(struct hostent *hp)
{
char *buf;
struct lifconf lifc;
struct lifnum lifn;
struct lifreq lifr;
struct lifreq *lifrp;
int bufsiz;
int nha;
int nif;
int s;
if ((s = socket(hp->h_addrtype, SOCK_DGRAM, 0)) == -1) {
perror("socket");
return (0);
}
lifn.lifn_family = hp->h_addrtype;
lifn.lifn_flags = LIFC_EXTERNAL_SOURCE;
if (ioctl(s, SIOCGLIFNUM, (char *)&lifn) == -1) {
perror("SIOCGLIFNUM");
(void) close(s);
return (0);
}
bufsiz = lifn.lifn_count * sizeof (struct lifreq);
if ((buf = malloc(bufsiz)) == NULL) {
perror("malloc");
(void) close(s);
return (0);
}
lifc.lifc_family = hp->h_addrtype;
lifc.lifc_flags = LIFC_EXTERNAL_SOURCE;
lifc.lifc_len = bufsiz;
lifc.lifc_buf = buf;
if (ioctl(s, SIOCGLIFCONF, (char *)&lifc) == -1) {
perror("SIOCGLIFCONF");
(void) close(s);
free(buf);
return (0);
}
#define lifraddrp(lifrp) ((lifrp->lifr_addr.ss_family == AF_INET6) ? \
(void *) &((struct sockaddr_in6 *)&lifrp->lifr_addr)->sin6_addr : \
(void *) &((struct sockaddr_in *)&lifrp->lifr_addr)->sin_addr)
for (lifrp = lifc.lifc_req,
nif = lifc.lifc_len / sizeof (struct lifreq);
nif > 0; nif--, lifrp++) {
if (lifrp->lifr_addr.ss_family != hp->h_addrtype) {
continue;
}
(void) memset(&lifr, 0, sizeof (lifr));
(void) strncpy(lifr.lifr_name, lifrp->lifr_name,
sizeof (lifr.lifr_name));
if (ioctl(s, SIOCGLIFFLAGS, (caddr_t)&lifr) == -1) {
perror("SIOCGLIFFLAGS");
(void) close(s);
free(buf);
return (0);
}
for (nha = 0; hp->h_addr_list[nha]; nha++) {
if (memcmp(hp->h_addr_list[nha], lifraddrp(lifrp),
hp->h_length) == 0) {
(void) close(s);
free(buf);
return (1);
}
}
}
#undef lifraddrp
(void) close(s);
free(buf);
return (0);
}