source: rtems/cpukit/libnetworking/libc/getnetbynis.c @ d8fce03

/*-
 * 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 HAVE_CONFIG_H
#include "config.h"
#endif

#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);
}