unrealircd/src/res_mkquery.c

/*
 * ++Copyright++ 1985, 1993
 * -
 * 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.
 * -
 * --Copyright--
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)res_mkquery.c	8.1 (Berkeley) 6/4/93";
static char rcsid[] = "$Id$";
#endif /* LIBC_SCCS and not lint */

#include "struct.h"
#include "common.h"
#include "sys.h"
#include "res.h"
#include "numeric.h"
#include "h.h"

#include <signal.h>
#ifndef _WIN32
#include <sys/time.h>
#include <sys/socket.h>
#endif
#include "nameser.h"
#include "resolv.h"
#include <string.h>

/*
 * Form all types of queries.
 * Returns the size of the result or -1.
 */
int
ircd_res_mkquery(int op, const char *dname, int class, int type, const u_char *data, int datalen,
const u_char *newrr_in, u_char *buf, int buflen)
{
	register HEADER *hp;
	register u_char *cp;
	register int n;
	u_char *dnptrs[20], **dpp, **lastdnptr;

	if ((ircd_res.options & RES_INIT) == 0 && ircd_res_init() == -1)
	{
		SET_ERRNO(NETDB_INTERNAL);
		return (-1);
	}
#ifdef DEBUGMODE
	Debug((DEBUG_DNS,
		";; res_mkquery(%d, %s, %d, %d)",
		    op, dname, class, type));
#endif
	/*
	 * Initialize header fields.
	 */
	if ((buf == NULL) || (buflen < HFIXEDSZ))
		return (-1);
	bzero(buf, HFIXEDSZ);
	hp = (HEADER *) buf;
	hp->id = htons(++ircd_res.id);
	hp->opcode = op;
	hp->rd = (ircd_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 =
		      ircd_dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
			  return (-1);
		  cp += n;
		  buflen -= n;
		  ircd__putshort(type, cp);
		  cp += INT16SZ;
		  ircd__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 = ircd_dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
		  if (n < 0)
			  return (-1);
		  cp += n;
		  buflen -= n;
		  ircd__putshort(T_NULL, cp);
		  cp += INT16SZ;
		  ircd__putshort(class, cp);
		  cp += INT16SZ;
		  ircd__putlong(0, cp);
		  cp += INT32SZ;
		  ircd__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 */
		  ircd__putshort(type, cp);
		  cp += INT16SZ;
		  ircd__putshort(class, cp);
		  cp += INT16SZ;
		  ircd__putlong(0, cp);
		  cp += INT32SZ;
		  ircd__putshort(datalen, cp);
		  cp += INT16SZ;
		  if (datalen)
		  {
			  bcopy(data, cp, datalen);
			  cp += datalen;
		  }
		  hp->ancount = htons(1);
		  break;

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