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/*-

 * 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 1.2 2001-09-27 12:01:53 chris Exp $";

static char rcsid[] = "$Id: getnetbynis.c,v 1.2 2001-09-27 12:01:53 chris 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(name, map, af)

        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(name)

        const char *name;

{

        return _getnetbynis(name, "networks.byname", AF_INET);

}

struct netent *

_getnetbynisaddr(addr, af)

        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);

}