StdLib/BsdSocketLib/getnetbynis.c

/*-
 * Copyright (c) 1994, Garrett Wollman
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)$Id: getnetbynis.c,v 1.1.1.1 2003/11/19 01:51:28 kyu3 Exp $";
static char rcsid[] = "$Id: getnetbynis.c,v 1.1.1.1 2003/11/19 01:51:28 kyu3 Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <arpa/nameser.h>
#ifdef YP
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#endif

#define MAXALIASES  35
#define MAXADDRS    35

#ifdef YP
static char *host_aliases[MAXALIASES];
#endif /* YP */

static struct netent *
_getnetbynis(const char *name, char *map, int af)
{
#ifdef YP
    register char *cp, **q;
    static char *result;
    int resultlen;
    static struct netent h;
    static char *domain = (char *)NULL;
    static char ypbuf[YPMAXRECORD + 2];

    switch(af) {
    case AF_INET:
        break;
    default:
    case AF_INET6:
        errno = EAFNOSUPPORT;
        return NULL;
    }

    if (domain == (char *)NULL)
        if (yp_get_default_domain (&domain))
            return (NULL);

    if (yp_match(domain, map, name, strlen(name), &result, &resultlen))
        return (NULL);

    bcopy((char *)result, (char *)&ypbuf, resultlen);
    ypbuf[resultlen] = '\0';
    free(result);
    result = (char *)&ypbuf;

    if ((cp = index(result, '\n')))
        *cp = '\0';

    cp = strpbrk(result, " \t");
    *cp++ = '\0';
    h.n_name = result;

    while (*cp == ' ' || *cp == '\t')
        cp++;

    h.n_net = inet_network(cp);
    h.n_addrtype = AF_INET;

    q = h.n_aliases = host_aliases;
    cp = strpbrk(cp, " \t");
    if (cp != NULL)
        *cp++ = '\0';
    while (cp && *cp) {
        if (*cp == ' ' || *cp == '\t') {
            cp++;
            continue;
        }
        if (q < &host_aliases[MAXALIASES - 1])
            *q++ = cp;
        cp = strpbrk(cp, " \t");
        if (cp != NULL)
            *cp++ = '\0';
    }
    *q = NULL;
    return (&h);
#else
    return (NULL);
#endif
}

struct netent *
_getnetbynisname(const char *name)
{
    return _getnetbynis(name, "networks.byname", AF_INET);
}

struct netent *
_getnetbynisaddr(unsigned long addr, int af)
{
    char *str, *cp;
    unsigned long net2;
    int nn;
    unsigned int netbr[4];
    char buf[MAXDNAME];

    if (af != AF_INET) {
        errno = EAFNOSUPPORT;
        return (NULL);
    }

        for (nn = 4, net2 = addr; net2; net2 >>= 8) {
                netbr[--nn] = net2 & 0xff;
    }

    switch (nn) {
    case 3:     /* Class A */
        sprintf(buf, "%u", netbr[3]);
        break;
        case 2:     /* Class B */
        sprintf(buf, "%u.%u", netbr[2], netbr[3]);
        break;
        case 1:     /* Class C */
        sprintf(buf, "%u.%u.%u", netbr[1], netbr[2], netbr[3]);
                break;
        case 0:     /* Class D - E */
        sprintf(buf, "%u.%u.%u.%u", netbr[0], netbr[1],
            netbr[2], netbr[3]);
        break;
    }

    str = (char *)&buf;
    cp = str + (strlen(str) - 2);

    while(!strcmp(cp, ".0")) {
        *cp = '\0';
        cp = str + (strlen(str) - 2);
    }

    return _getnetbynis(str, "networks.byaddr", af);
}