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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_mkquery.c       8.1 (Berkeley) 6/4/93";

static char orig_rcsid[] = "From: Id: res_mkquery.c,v 8.9 1997/04/24 22:22:36 vixie Exp $";

static char rcsid[] = "$Id: res_mkquery.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 <netdb.h>

#include <resolv.h>

#include <stdio.h>

#include <string.h>

#include "res_config.h"

/*

 * Form all types of queries.

 * Returns the size of the result or -1.

 */

int

res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen)

        int op;                 /* opcode of query */

        const char *dname;      /* domain name */

        int class, type;        /* class and type of query */

        const u_char *data;     /* resource record data */

        int datalen;            /* length of data */

        const u_char *newrr_in; /* new rr for modify or append */

        u_char *buf;            /* buffer to put query */

        int buflen;             /* size of buffer */

{

        register HEADER *hp;

        register u_char *cp;

        register int n;

        u_char *dnptrs[20], **dpp, **lastdnptr;

        if ((_res.options & RES_INIT) == 0 && res_init() == -1) {

                h_errno = NETDB_INTERNAL;

                return (-1);

        }

#ifdef DEBUG

        if (_res.options & RES_DEBUG)

                printf(";; res_mkquery(%d, %s, %d, %d)\n",

                       op, dname, class, type);

#endif

        /*

         * Initialize header fields.

         */

        if ((buf == NULL) || (buflen < HFIXEDSZ))

                return (-1);

        memset(buf, 0, HFIXEDSZ);

        hp = (HEADER *) buf;

        hp->id = htons(++_res.id);

        hp->opcode = op;

        hp->rd = (_res.options & RES_RECURSE) != 0;

        hp->rcode = NOERROR;

        cp = buf + HFIXEDSZ;

        buflen -= HFIXEDSZ;

        dpp = dnptrs;

        *dpp++ = buf;

        *dpp++ = NULL;

        lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];

        /*

         * perform opcode specific processing

         */

        switch (op) {

        case QUERY:     /*FALLTHROUGH*/

        case NS_NOTIFY_OP:

                if ((buflen -= QFIXEDSZ) < 0)

                        return (-1);

                if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)

                        return (-1);

                cp += n;

                buflen -= n;

                __putshort(type, cp);

                cp += INT16SZ;

                __putshort(class, cp);

                cp += INT16SZ;

                hp->qdcount = htons(1);

                if (op == QUERY || data == NULL)

                        break;

                /*

                 * Make an additional record for completion domain.

                 */

                buflen -= RRFIXEDSZ;

                n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);

                if (n < 0)

                        return (-1);

                cp += n;

                buflen -= n;

                __putshort(T_NULL, cp);

                cp += INT16SZ;

                __putshort(class, cp);

                cp += INT16SZ;

                __putlong(0, cp);

                cp += INT32SZ;

                __putshort(0, cp);

                cp += INT16SZ;

                hp->arcount = htons(1);

                break;

        case IQUERY:

                /*

                 * Initialize answer section

                 */

                if (buflen < 1 + RRFIXEDSZ + datalen)

                        return (-1);

                *cp++ = '\0';   /* no domain name */

                __putshort(type, cp);

                cp += INT16SZ;

                __putshort(class, cp);

                cp += INT16SZ;

                __putlong(0, cp);

                cp += INT32SZ;

                __putshort(datalen, cp);

                cp += INT16SZ;

                if (datalen) {

                        memcpy(cp, data, datalen);

                        cp += datalen;

                }

                hp->ancount = htons(1);

                break;

        default:

                return (-1);

        }

        return (cp - buf);

}