/*      $NetBSD: res_mkquery.c,v 1.1.1.2 2012/09/09 16:08:10 christos Exp $     */

/*
* Portions Copyright (C) 2004, 2005, 2008  Internet Systems Consortium, Inc. ("ISC")
* Portions Copyright (C) 1996, 1997, 1988, 1999, 2001, 2003  Internet Software Consortium.
*
* Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS.  IN NO EVENT SHALL ISC 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 (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.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
static const char rcsid[] = "Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp ";
#endif /* LIBC_SCCS and not lint */

#include "port_before.h"
#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 "port_after.h"

/* Options.  Leave them on. */
#define DEBUG

extern const char *_res_opcodes[];

/*%
* Form all types of queries.
* Returns the size of the result or -1.
*/
int
res_nmkquery(res_state statp,
            int op,                    /*!< opcode of query  */
            const char *dname,         /*!< domain name  */
            int class, int 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, *ep;
       register int n;
       u_char *dnptrs[20], **dpp, **lastdnptr;

       UNUSED(newrr_in);

#ifdef DEBUG
       if (statp->options & RES_DEBUG)
               printf(";; res_nmkquery(%s, %s, %s, %s)\n",
                      _res_opcodes[op], dname, p_class(class), p_type(type));
#endif
       /*
        * Initialize header fields.
        */
       if ((buf == NULL) || (buflen < HFIXEDSZ))
               return (-1);
       memset(buf, 0, HFIXEDSZ);
       hp = (HEADER *) buf;
       statp->id = res_nrandomid(statp);
       hp->id = htons(statp->id);
       hp->opcode = op;
       hp->rd = (statp->options & RES_RECURSE) != 0U;
       hp->rcode = NOERROR;
       cp = buf + HFIXEDSZ;
       ep = buf + buflen;
       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 (ep - cp < QFIXEDSZ)
                       return (-1);
               if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
                   lastdnptr)) < 0)
                       return (-1);
               cp += n;
               ns_put16(type, cp);
               cp += INT16SZ;
               ns_put16(class, cp);
               cp += INT16SZ;
               hp->qdcount = htons(1);
               if (op == QUERY || data == NULL)
                       break;
               /*
                * Make an additional record for completion domain.
                */
               if ((ep - cp) < RRFIXEDSZ)
                       return (-1);
               n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
                           dnptrs, lastdnptr);
               if (n < 0)
                       return (-1);
               cp += n;
               ns_put16(T_NULL, cp);
               cp += INT16SZ;
               ns_put16(class, cp);
               cp += INT16SZ;
               ns_put32(0, cp);
               cp += INT32SZ;
               ns_put16(0, cp);
               cp += INT16SZ;
               hp->arcount = htons(1);
               break;

       case IQUERY:
               /*
                * Initialize answer section
                */
               if (ep - cp < 1 + RRFIXEDSZ + datalen)
                       return (-1);
               *cp++ = '\0';   /*%< no domain name */
               ns_put16(type, cp);
               cp += INT16SZ;
               ns_put16(class, cp);
               cp += INT16SZ;
               ns_put32(0, cp);
               cp += INT32SZ;
               ns_put16(datalen, cp);
               cp += INT16SZ;
               if (datalen) {
                       memcpy(cp, data, datalen);
                       cp += datalen;
               }
               hp->ancount = htons(1);
               break;

       default:
               return (-1);
       }
       return (cp - buf);
}

#ifdef RES_USE_EDNS0
/* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */

int
res_nopt(res_state statp,
        int n0,                /*%< current offset in buffer */
        u_char *buf,           /*%< buffer to put query */
        int buflen,            /*%< size of buffer */
        int anslen)            /*%< UDP answer buffer size */
{
       register HEADER *hp;
       register u_char *cp, *ep;
       u_int16_t flags = 0;

#ifdef DEBUG
       if ((statp->options & RES_DEBUG) != 0U)
               printf(";; res_nopt()\n");
#endif

       hp = (HEADER *) buf;
       cp = buf + n0;
       ep = buf + buflen;

       if ((ep - cp) < 1 + RRFIXEDSZ)
               return (-1);

       *cp++ = 0;                              /*%< "." */
       ns_put16(ns_t_opt, cp);                 /*%< TYPE */
       cp += INT16SZ;
       ns_put16(anslen & 0xffff, cp);          /*%< CLASS = UDP payload size */
       cp += INT16SZ;
       *cp++ = NOERROR;                        /*%< extended RCODE */
       *cp++ = 0;                              /*%< EDNS version */

       if (statp->options & RES_USE_DNSSEC) {
#ifdef DEBUG
               if (statp->options & RES_DEBUG)
                       printf(";; res_opt()... ENDS0 DNSSEC\n");
#endif
               flags |= NS_OPT_DNSSEC_OK;
       }
       ns_put16(flags, cp);
       cp += INT16SZ;

       ns_put16(0U, cp);                       /*%< RDLEN */
       cp += INT16SZ;

       hp->arcount = htons(ntohs(hp->arcount) + 1);

       return (cp - buf);
}

/*
* Construct variable data (RDATA) block for OPT psuedo-RR, append it
* to the buffer, then update the RDLEN field (previously set to zero by
* res_nopt()) with the new RDATA length.
*/
int
res_nopt_rdata(res_state statp,
         int n0,               /*%< current offset in buffer */
         u_char *buf,          /*%< buffer to put query */
         int buflen,           /*%< size of buffer */
         u_char *rdata,        /*%< ptr to start of opt rdata */
         u_short code,         /*%< OPTION-CODE */
         u_short len,          /*%< OPTION-LENGTH */
         u_char *data)         /*%< OPTION_DATA */
{
       register u_char *cp, *ep;

#ifdef DEBUG
       if ((statp->options & RES_DEBUG) != 0U)
               printf(";; res_nopt_rdata()\n");
#endif

       cp = buf + n0;
       ep = buf + buflen;

       if ((ep - cp) < (4 + len))
               return (-1);

       if (rdata < (buf + 2) || rdata >= ep)
               return (-1);

       ns_put16(code, cp);
       cp += INT16SZ;

       ns_put16(len, cp);
       cp += INT16SZ;

       memcpy(cp, data, len);
       cp += len;

       len = cp - rdata;
       ns_put16(len, rdata - 2);       /* Update RDLEN field */

       return (cp - buf);
}
#endif

/*! \file */

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