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/*

 * Copyright (c) 1985, 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.

 */

/*

 * Portions Copyright (c) 1996 by Internet Software Consortium.

 *

 * 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.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS

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

 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE

 * CONSORTIUM 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.

 */

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

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

static char orig_rcsid[] = "From: Id: res_comp.c,v 8.11 1997/05/21 19:31:04 halley Exp $";

static char rcsid[] = "$Id: res_comp.c,v 1.2 2001-09-27 12:01:53 chris Exp $";

#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>

#include <sys/param.h>

#include <netinet/in.h>

#include <arpa/nameser.h>

#include <ctype.h>

#include <resolv.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#define BIND_4_COMPAT

/*

 * Expand compressed domain name 'comp_dn' to full domain name.

 * 'msg' is a pointer to the begining of the message,

 * 'eomorig' points to the first location after the message,

 * 'exp_dn' is a pointer to a buffer of size 'length' for the result.

 * Return size of compressed name or -1 if there was an error.

 */

int

dn_expand(const u_char *msg, const u_char *eom, const u_char *src,

          char *dst, int dstsiz)

{

        int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);

        if (n > 0 && dst[0] == '.')

                dst[0] = '\0';

        return (n);

}

/*

 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.

 * Return the size of the compressed name or -1.

 * 'length' is the size of the array pointed to by 'comp_dn'.

 */

int

dn_comp(const char *src, u_char *dst, int dstsiz,

        u_char **dnptrs, u_char **lastdnptr)

{

        return (ns_name_compress(src, dst, (size_t)dstsiz,

                                 (const u_char **)dnptrs,

                                 (const u_char **)lastdnptr));

}

/*

 * Skip over a compressed domain name. Return the size or -1.

 */

int

dn_skipname(const u_char *ptr, const u_char *eom) {

        const u_char *saveptr = ptr;

        if (ns_name_skip(&ptr, eom) == -1)

                return (-1);

        return (ptr - saveptr);

}

/*

 * Verify that a domain name uses an acceptable character set.

 */

/*

 * Note the conspicuous absence of ctype macros in these definitions.  On

 * non-ASCII hosts, we can't depend on string literals or ctype macros to

 * tell us anything about network-format data.  The rest of the BIND system

 * is not careful about this, but for some reason, we're doing it right here.

 */

#define PERIOD 0x2e

#define hyphenchar(c) ((c) == 0x2d)

#define bslashchar(c) ((c) == 0x5c)

#define periodchar(c) ((c) == PERIOD)

#define asterchar(c) ((c) == 0x2a)

#define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \

                   || ((c) >= 0x61 && (c) <= 0x7a))

#define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)

#define borderchar(c) (alphachar(c) || digitchar(c))

#define middlechar(c) (borderchar(c) || hyphenchar(c))

#define domainchar(c) ((c) > 0x20 && (c) < 0x7f)

int

res_hnok(dn)

        const char *dn;

{

        int ppch = '\0', pch = PERIOD, ch = *dn++;

        while (ch != '\0') {

                int nch = *dn++;

                if (periodchar(ch)) {

                        (void)NULL;

                } else if (periodchar(pch)) {

                        if (!borderchar(ch))

                                return (0);

                } else if (periodchar(nch) || nch == '\0') {

                        if (!borderchar(ch))

                                return (0);

                } else {

                        if (!middlechar(ch))

                                return (0);

                }

                ppch = pch, pch = ch, ch = nch;

        }

        return (1);

}

/*

 * hostname-like (A, MX, WKS) owners can have "*" as their first label

 * but must otherwise be as a host name.

 */

int

res_ownok(dn)

        const char *dn;

{

        if (asterchar(dn[0])) {

                if (periodchar(dn[1]))

                        return (res_hnok(dn+2));

                if (dn[1] == '\0')

                        return (1);

        }

        return (res_hnok(dn));

}

/*

 * SOA RNAMEs and RP RNAMEs can have any printable character in their first

 * label, but the rest of the name has to look like a host name.

 */

int

res_mailok(dn)

        const char *dn;

{

        int ch, escaped = 0;

        /* "." is a valid missing representation */

        if (*dn == '\0')

                return (1);

        /* otherwise <label>.<hostname> */

        while ((ch = *dn++) != '\0') {

                if (!domainchar(ch))

                        return (0);

                if (!escaped && periodchar(ch))

                        break;

                if (escaped)

                        escaped = 0;

                else if (bslashchar(ch))

                        escaped = 1;

        }

        if (periodchar(ch))

                return (res_hnok(dn));

        return (0);

}

/*

 * This function is quite liberal, since RFC 1034's character sets are only

 * recommendations.

 */

int

res_dnok(dn)

        const char *dn;

{

        int ch;

        while ((ch = *dn++) != '\0')

                if (!domainchar(ch))

                        return (0);

        return (1);

}

#ifdef BIND_4_COMPAT

/*

 * This module must export the following externally-visible symbols:

 *    ___putlong

 *    ___putshort

 *    __getlong

 *    __getshort

 * Note that one _ comes from C and the others come from us.

 */

void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }

void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }

u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }

u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }

#endif /*BIND_4_COMPAT*/