5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland/*
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * CDDL HEADER START
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland *
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * The contents of this file are subject to the terms of the
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * Common Development and Distribution License (the "License").
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * You may not use this file except in compliance with the License.
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland *
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * or http://www.opensolaris.org/os/licensing.
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * See the License for the specific language governing permissions
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * and limitations under the License.
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland *
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * When distributing Covered Code, include this CDDL HEADER in each
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * If applicable, add the following below this CDDL HEADER, with the
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * fields enclosed by brackets "[]" replaced with your own identifying
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * information: Portions Copyright [yyyy] [name of copyright owner]
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland *
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * CDDL HEADER END
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland */
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland/*
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * Use is subject to license terms.
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland */
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <stdio.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <sys/types.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <sys/socket.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <netdb.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <unistd.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <sys/types.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <sys/socket.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <sys/sockio.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <net/if.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <netinet/in.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <arpa/inet.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <errno.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <stdlib.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <string.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#include <libintl.h>
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterlandstatic int is_local_if(struct hostent *hp);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland/*
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * Given a host name, check to see if it points to the local host.
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * If it does, return 1, else return 0.
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland *
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * The strategy is this: translate the host name argument to a list of
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * addresses. Then compare each of those addresses to the addresses of
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland * network interfaces on this host.
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland */
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterlandint
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterlandis_local_host(char *host)
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland{
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland struct hostent *hp;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland int err;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland int flags = AI_DEFAULT;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if (hp = getipnodebyname((const char *) host, AF_INET, flags, &err))
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if (is_local_if(hp))
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland return (1);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if (hp = getipnodebyname((const char *) host, AF_INET6, flags, &err))
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if (is_local_if(hp))
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland return (1);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland return (0);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland}
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterlandstatic int
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterlandis_local_if(struct hostent *hp)
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland{
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland char *buf;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland struct lifconf lifc;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland struct lifnum lifn;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland struct lifreq lifr;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland struct lifreq *lifrp;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland int bufsiz;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland int nha;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland int nif;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland int s;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if ((s = socket(hp->h_addrtype, SOCK_DGRAM, 0)) == -1) {
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland perror("socket");
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland return (0);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland }
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland lifn.lifn_family = hp->h_addrtype;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland lifn.lifn_flags = LIFC_EXTERNAL_SOURCE;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if (ioctl(s, SIOCGLIFNUM, (char *)&lifn) == -1) {
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland perror("SIOCGLIFNUM");
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland (void) close(s);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland return (0);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland }
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland bufsiz = lifn.lifn_count * sizeof (struct lifreq);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if ((buf = malloc(bufsiz)) == NULL) {
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland perror("malloc");
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland (void) close(s);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland return (0);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland }
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland lifc.lifc_family = hp->h_addrtype;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland lifc.lifc_flags = LIFC_EXTERNAL_SOURCE;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland lifc.lifc_len = bufsiz;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland lifc.lifc_buf = buf;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if (ioctl(s, SIOCGLIFCONF, (char *)&lifc) == -1) {
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland perror("SIOCGLIFCONF");
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland (void) close(s);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland free(buf);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland return (0);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland }
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#define lifraddrp(lifrp) ((lifrp->lifr_addr.ss_family == AF_INET6) ? \
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland (void *) &((struct sockaddr_in6 *)&lifrp->lifr_addr)->sin6_addr : \
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland (void *) &((struct sockaddr_in *)&lifrp->lifr_addr)->sin_addr)
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland for (lifrp = lifc.lifc_req,
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland nif = lifc.lifc_len / sizeof (struct lifreq);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland nif > 0; nif--, lifrp++) {
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if (lifrp->lifr_addr.ss_family != hp->h_addrtype) {
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland continue;
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland }
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland (void) memset(&lifr, 0, sizeof (lifr));
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland (void) strncpy(lifr.lifr_name, lifrp->lifr_name,
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland sizeof (lifr.lifr_name));
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if (ioctl(s, SIOCGLIFFLAGS, (caddr_t)&lifr) == -1) {
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland perror("SIOCGLIFFLAGS");
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland (void) close(s);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland free(buf);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland return (0);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland }
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland for (nha = 0; hp->h_addr_list[nha]; nha++) {
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland if (memcmp(hp->h_addr_list[nha], lifraddrp(lifrp),
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland hp->h_length) == 0) {
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland (void) close(s);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland free(buf);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland return (1);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland }
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland }
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland }
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland#undef lifraddrp
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland (void) close(s);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland free(buf);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland return (0);
5c51f1241dbbdf2656d0e10011981411ed0c9673Moriah Waterland}