gno/lib/netdb/res_mkquery.c
1998-01-24 07:05:48 +00:00

205 lines
6.0 KiB
C

/*
* Copyright (c) 1985 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)res_mkquery.c 6.16 (Berkeley) 3/6/91";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <stdio.h>
#include <string.h>
#include "protos.h"
/*
* Form all types of queries.
* Returns the size of the result or -1.
*/
int res_mkquery(int op, const char *dname, int class, int type,
const char *data, int datalen, const struct rrec *newrr,
char *buf, int buflen)
{
register HEADER *hp;
register char *cp;
register int n;
static char *dnptrs[10];
char **dpp, **lastdnptr;
#ifdef DEBUG
if (_res.options & RES_DEBUG)
printf("res_mkquery(%d, %s, %d, %d)\n", op, dname, class, type);
#endif /* DEBUG */
/*
* Initialize header fields.
*/
if ((buf == NULL) || (buflen < sizeof(HEADER)))
return(-1);
bzero(buf, sizeof(HEADER));
hp = (HEADER *) buf;
hp->id = htons(++_res.id);
hp->opcode = op;
hp->pr = (_res.options & RES_PRIMARY) != 0;
hp->rd = (_res.options & RES_RECURSE) != 0;
hp->rcode = NOERROR;
cp = buf + sizeof(HEADER);
buflen -= sizeof(HEADER);
dpp = dnptrs;
*dpp++ = buf;
*dpp++ = NULL;
lastdnptr = dnptrs + sizeof(dnptrs)/sizeof(dnptrs[0]);
/*
* perform opcode specific processing
*/
switch (op) {
case QUERY:
if ((buflen -= QFIXEDSZ) < 0)
return(-1);
if ((n = dn_comp((u_char *)dname, (u_char *)cp, buflen,
(u_char **)dnptrs, (u_char **)lastdnptr)) < 0)
return (-1);
cp += n;
buflen -= n;
__putshort(type, (u_char *)cp);
cp += sizeof(u_short);
__putshort(class, (u_char *)cp);
cp += sizeof(u_short);
hp->qdcount = htons(1);
if (op == QUERY || data == NULL)
break;
/*
* Make an additional record for completion domain.
*/
buflen -= RRFIXEDSZ;
if ((n = dn_comp((u_char *)data, (u_char *)cp, buflen,
(u_char **)dnptrs, (u_char **)lastdnptr)) < 0)
return (-1);
cp += n;
buflen -= n;
__putshort(T_NULL, (u_char *)cp);
cp += sizeof(u_short);
__putshort(class, (u_char *)cp);
cp += sizeof(u_short);
__putlong(0, (u_char *)cp);
cp += sizeof(u_long);
__putshort(0, (u_char *)cp);
cp += sizeof(u_short);
hp->arcount = htons(1);
break;
case IQUERY:
/*
* Initialize answer section
*/
if (buflen < 1 + RRFIXEDSZ + datalen)
return (-1);
*cp++ = '\0'; /* no domain name */
__putshort(type, (u_char *)cp);
cp += sizeof(u_short);
__putshort(class, (u_char *)cp);
cp += sizeof(u_short);
__putlong(0, (u_char *)cp);
cp += sizeof(u_long);
__putshort(datalen, (u_char *)cp);
cp += sizeof(u_short);
if (datalen) {
bcopy(data, cp, datalen);
cp += datalen;
}
hp->ancount = htons(1);
break;
#ifdef ALLOW_UPDATES
/*
* For UPDATEM/UPDATEMA, do UPDATED/UPDATEDA followed by UPDATEA
* (Record to be modified is followed by its replacement in msg.)
*/
case UPDATEM:
case UPDATEMA:
case UPDATED:
/*
* The res code for UPDATED and UPDATEDA is the same; user
* calls them differently: specifies data for UPDATED; server
* ignores data if specified for UPDATEDA.
*/
case UPDATEDA:
buflen -= RRFIXEDSZ + datalen;
if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
return (-1);
cp += n;
__putshort(type, cp);
cp += sizeof(u_short);
__putshort(class, cp);
cp += sizeof(u_short);
__putlong(0, cp);
cp += sizeof(u_long);
__putshort(datalen, cp);
cp += sizeof(u_short);
if (datalen) {
bcopy(data, cp, datalen);
cp += datalen;
}
if ( (op == UPDATED) || (op == UPDATEDA) ) {
hp->ancount = htons(0);
break;
}
/* Else UPDATEM/UPDATEMA, so drop into code for UPDATEA */
case UPDATEA: /* Add new resource record */
buflen -= RRFIXEDSZ + datalen;
if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
return (-1);
cp += n;
__putshort(newrr->r_type, cp);
cp += sizeof(u_short);
__putshort(newrr->r_class, cp);
cp += sizeof(u_short);
__putlong(0, cp);
cp += sizeof(u_long);
__putshort(newrr->r_size, cp);
cp += sizeof(u_short);
if (newrr->r_size) {
bcopy(newrr->r_data, cp, newrr->r_size);
cp += newrr->r_size;
}
hp->ancount = htons(0);
break;
#endif /* ALLOW_UPDATES */
}
return (cp - buf);
}