source: rtems/c/src/libnetworking/libc/gethostbynis.c @ 39e6e65a

/*-
 * 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[] = "@(#)$Id$";
static char rcsid[] = "$Id$";
#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>
#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];
static char hostaddr[MAXADDRS];
static char *host_addrs[2];
#endif /* YP */

static struct hostent *
_gethostbynis(name, map, af)
        const char *name;
        char *map;
        int af;
{
#ifdef YP
        register char *cp, **q;
        char *result;
        int resultlen;
        static struct hostent 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 ((struct hostent *)NULL);

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

        /* avoid potential memory leak */
        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.h_addr_list = host_addrs;
        h.h_addr = hostaddr;
        *((u_long *)h.h_addr) = inet_addr(result);
        h.h_length = sizeof(u_long);
        h.h_addrtype = AF_INET;
        while (*cp == ' ' || *cp == '\t')
                cp++;
        h.h_name = cp;
        q = h.h_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 /* YP */
}

struct hostent *
_gethostbynisname(name, af)
        const char *name;
        int af;
{
        return _gethostbynis(name, "hosts.byname", af);
}

struct hostent *
_gethostbynisaddr(addr, len, af)
        const char *addr;
        int len;
        int af;
{
        return _gethostbynis(inet_ntoa(*(struct in_addr *)addr),"hosts.byaddr", af);
}