nfs/lib/selfcheck.c

	selfcheck.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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
 */
/*
 *  selfcheck.c
 *      Copyright (c) 1999 Sun Microsystems Inc.
 *      All Rights Reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <errno.h>
#include <syslog.h>

#include <strings.h>
#include <malloc.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/sockio.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <netdb.h>
#include <net/if.h>

int
self_check(hostname)
    char *hostname;
{
    int s, res = 0;
    struct sioc_addrreq areq;

    struct hostent *hostinfo;
    int family;
    int flags;
    int error_num;
    char **hostptr;

    struct sockaddr_in6 ipv6addr;

    family = AF_INET6;
    flags = AI_DEFAULT;

    if ((s = socket(family, SOCK_DGRAM, 0)) < 0) {
        syslog(LOG_ERR, "self_check: socket: %m");
        return (0);
    }

    if ((hostinfo = getipnodebyname(hostname, family, flags,
        &error_num)) == NULL) {

        if (error_num == TRY_AGAIN)
            syslog(LOG_DEBUG,
                "self_check: unknown host: %s (try again later)\n",
                hostname);
        else
            syslog(LOG_DEBUG,
                "self_check: unknown host: %s\n", hostname);

        (void) close(s);
        return (0);
    }

    for (hostptr = hostinfo->h_addr_list; *hostptr; hostptr++) {
        bzero(&ipv6addr, sizeof (ipv6addr));
        ipv6addr.sin6_family = AF_INET6;
        ipv6addr.sin6_addr = *((struct in6_addr *)(*hostptr));
        memcpy(&areq.sa_addr, (void *)&ipv6addr, sizeof (ipv6addr));
        areq.sa_res = -1;
        (void) ioctl(s, SIOCTMYADDR, (caddr_t)&areq);
        if (areq.sa_res == 1) {
            res = 1;
            break;
        }
    }

    freehostent(hostinfo);

    (void) close(s);
    return (res);
}

#define MAXIFS  32

/*
 * create an ifconf structure that represents all the interfaces
 * configured for this host.  Two buffers are allcated here:
 *  lifc - the ifconf structure returned
 *  lifc->lifc_buf - the list of ifreq structures
 * Both of the buffers must be freed by the calling routine.
 * A NULL pointer is returned upon failure.  In this case any
 * data that was allocated before the failure has already been
 * freed.
 */
struct lifconf *
getmyaddrs()
{
    int sock;
    struct lifnum lifn;
    int numifs;
    char *buf;
    struct lifconf *lifc;

    if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
        syslog(LOG_ERR, "statd:getmyaddrs socket: %m");
        return ((struct lifconf *)NULL);
    }

    lifn.lifn_family = AF_UNSPEC;
    lifn.lifn_flags = 0;

    if (ioctl(sock, SIOCGLIFNUM, (char *)&lifn) < 0) {
        syslog(LOG_ERR,
        "statd:getmyaddrs, get number of interfaces, error: %m");
        numifs = MAXIFS;
    }

    numifs = lifn.lifn_count;

    lifc = (struct lifconf *)malloc(sizeof (struct lifconf));
    lifc = malloc(sizeof (struct lifconf));
    if (lifc == NULL) {
        syslog(LOG_ERR,
            "statd:getmyaddrs, malloc for lifconf failed: %m");
        (void) close(sock);
        return ((struct lifconf *)NULL);
    }
    buf = (char *)malloc(numifs * sizeof (struct lifreq));
    if (buf == NULL) {
        syslog(LOG_ERR,
            "statd:getmyaddrs, malloc for lifreq failed: %m");
        (void) close(sock);
        free(lifc);
        return ((struct lifconf *)NULL);
    }

    lifc->lifc_family = AF_UNSPEC;
    lifc->lifc_flags = 0;
    lifc->lifc_buf = buf;
    lifc->lifc_len = numifs * sizeof (struct lifreq);

    if (ioctl(sock, SIOCGLIFCONF, (char *)lifc) < 0) {
        syslog(LOG_ERR, "statd:getmyaddrs, SIOCGLIFCONF, error: %m");
        (void) close(sock);
        free(buf);
        free(lifc);
        return ((struct lifconf *)NULL);
    }

    (void) close(sock);

    return (lifc);
}

int
Is_ipv6present(void)
{
    int sock;
    struct lifnum lifn;

    sock = socket(AF_INET6, SOCK_DGRAM, 0);
    if (sock < 0)
        return (0);

    lifn.lifn_family = AF_INET6;
    lifn.lifn_flags = 0;
    if (ioctl(sock, SIOCGLIFNUM, (char *)&lifn) < 0) {
        close(sock);
        return (0);
    }
    close(sock);
    if (lifn.lifn_count == 0)
        return (0);
    return (1);
}