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/*-

 * Copyright (c) 1985, 1988, 1993

 *      The Regents of the University of California.  All rights reserved.

 *

 * 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.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND 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.

 * -

 * Portions Copyright (c) 1993 by Digital Equipment Corporation.

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies, and that

 * the name of Digital Equipment Corporation not be used in advertising or

 * publicity pertaining to distribution of the document or software without

 * specific, written prior permission.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL

 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT

 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL

 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR

 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS

 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

 * SOFTWARE.

 * -

 * --Copyright--

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)gethostnamadr.c     8.1 (Berkeley) 6/4/93";

static char rcsid[] = "$Id: gethostbyht.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 <ctype.h>

#include <errno.h>

#include <string.h>

#include <arpa/nameser.h>       /* XXX */

#include <resolv.h>             /* XXX */

#define MAXALIASES      35

static struct hostent host;

static char *host_aliases[MAXALIASES];

static char hostbuf[BUFSIZ+1];

static FILE *hostf = NULL;

static u_char host_addr[16];    /* IPv4 or IPv6 */

static char *h_addr_ptrs[2];

static int stayopen = 0;

void

_sethosthtent(f)

        int f;

{

        if (!hostf)

                hostf = fopen(_PATH_HOSTS, "r" );

        else

                rewind(hostf);

        stayopen = f;

}

void

_endhosthtent()

{

        if (hostf && !stayopen) {

                (void) fclose(hostf);

                hostf = NULL;

        }

}

struct hostent *

gethostent()

{

        char *p;

        register char *cp, **q;

        int af, len;

        if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) {

                h_errno = NETDB_INTERNAL;

                return (NULL);

        }

 again:

        if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) {

                h_errno = HOST_NOT_FOUND;

                return (NULL);

        }

        if (*p == '#')

                goto again;

        if (!(cp = strpbrk(p, "#\n")))

                goto again;

        *cp = '\0';

        if (!(cp = strpbrk(p, " \t")))

                goto again;

        *cp++ = '\0';

        if (inet_pton(AF_INET6, p, host_addr) > 0) {

                af = AF_INET6;

                len = IN6ADDRSZ;

        } else if (inet_pton(AF_INET, p, host_addr) > 0) {

                if (_res.options & RES_USE_INET6) {

                        _map_v4v6_address((char*)host_addr, (char*)host_addr);

                        af = AF_INET6;

                        len = IN6ADDRSZ;

                } else {

                        af = AF_INET;

                        len = INADDRSZ;

                }

        } else {

                goto again;

        }

        h_addr_ptrs[0] = (char *)host_addr;

        h_addr_ptrs[1] = NULL;

        host.h_addr_list = h_addr_ptrs;

        host.h_length = len;

        host.h_addrtype = af;

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

                cp++;

        host.h_name = cp;

        q = host.h_aliases = host_aliases;

        if ((cp = strpbrk(cp, " \t")) != NULL)

                *cp++ = '\0';

        while (cp && *cp) {

                if (*cp == ' ' || *cp == '\t') {

                        cp++;

                        continue;

                }

                if (q < &host_aliases[MAXALIASES - 1])

                        *q++ = cp;

                if ((cp = strpbrk(cp, " \t")) != NULL)

                        *cp++ = '\0';

        }

        *q = NULL;

        h_errno = NETDB_SUCCESS;

        return (&host);

}

struct hostent *

_gethostbyhtname(name, af)

        const char *name;

        int af;

{

        register struct hostent *p;

        register char **cp;

        sethostent(0);

        while ((p = gethostent()) != NULL) {

                if (p->h_addrtype != af)

                        continue;

                if (strcasecmp(p->h_name, name) == 0)

                        break;

                for (cp = p->h_aliases; *cp != 0; cp++)

                        if (strcasecmp(*cp, name) == 0)

                                goto found;

        }

found:

        endhostent();

        return (p);

}

struct hostent *

_gethostbyhtaddr(addr, len, af)

        const char *addr;

        int len, af;

{

        register struct hostent *p;

        sethostent(0);

        while ((p = gethostent()) != NULL)

                if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len))

                        break;

        endhostent();

        return (p);

}