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amitcp-3.0ß2.lha
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res_mkquery.c
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C/C++ Source or Header
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1994-04-01
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4KB
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133 lines
/*
* 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 <conf.h>
#include <sys/param.h>
#include <api/arpa_nameser.h>
#include <api/resolv.h>
#include <kern/amiga_includes.h>
#include <api/amiga_api.h>
#include <kern/amiga_subr.h>
/*
* Form all types of queries.
* Returns the size of the result or -1.
*/
int res_mkquery(struct SocketBase *libPtr,
int op, /* opcode of query */
const char *dname, /* domain name */
int class,
int type, /* class and type of query */
const char *data, /* resource record data */
int datalen, /* length of data */
const struct rrec *newrr, /* new rr for modify or append */
char *buf, /* buffer to put query */
int buflen) /* size of buffer */
{
register HEADER *hp;
register char *cp;
register int n;
char *dnptrs[10], **dpp, **lastdnptr;
#ifdef RES_DEBUG
printf("res_mkquery(%d, %s, %d, %d)\n", op, dname, class, type);
#endif /* RES_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;
default:
return (-1); /* is call initially comes from gethostname()
no other opcodes are used */
}
return (cp - buf);
}