248 lines
7.3 KiB
C
248 lines
7.3 KiB
C
/* $NetBSD: res_mkquery.c,v 1.21 2000/12/20 18:47:37 christos Exp $ */
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/*-
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* Copyright (c) 1985, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* -
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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* -
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* --Copyright--
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
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static char rcsid[] = "Id: res_mkquery.c,v 8.5 1996/08/27 08:33:28 vixie Exp ";
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#else
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__RCSID("$NetBSD: res_mkquery.c,v 1.21 2000/12/20 18:47:37 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#if defined(_LIBC)
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#include "namespace.h"
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#endif
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <assert.h>
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#include <errno.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <string.h>
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#if defined(_LIBC) && defined(__weak_alias)
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__weak_alias(res_mkquery,_res_mkquery)
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#endif
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/*
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* Form all types of queries.
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* Returns the size of the result or -1.
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*/
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/* ARGSUSED */
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int
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res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen)
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int op; /* opcode of query */
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const char *dname; /* domain name */
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int class, type; /* class and type of query */
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const u_char *data; /* resource record data */
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int datalen; /* length of data */
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const u_char *newrr_in; /* new rr for modify or append */
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u_char *buf; /* buffer to put query */
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int buflen; /* size of buffer */
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{
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register HEADER *hp;
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register u_char *cp;
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register int n;
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u_char *dnptrs[20], **dpp, **lastdnptr;
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_DIAGASSERT(dname != NULL);
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/* data may be NULL */
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/* newrr_in is not used */
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if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
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h_errno = NETDB_INTERNAL;
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return (-1);
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}
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#ifdef DEBUG
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if (_res.options & RES_DEBUG)
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printf(";; res_mkquery(%d, %s, %d, %d)\n",
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op, dname, class, type);
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#endif
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/*
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* Initialize header fields.
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*/
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/*CONSTCOND*/
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if (sizeof(HEADER) != HFIXEDSZ) {
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/* XXX should raise compile time error, not runtime error */
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#ifdef DEBUG
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if (_res.options & RES_DEBUG)
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printf(";; HFIXEDSZ mismatch with sizeof(HEADER)\n");
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#endif
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return(-1);
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}
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if ((buf == NULL) || (buflen < HFIXEDSZ))
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return(-1);
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(void)memset(buf, 0, HFIXEDSZ);
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hp = (HEADER *)(void *)buf;
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hp->id = htons(++_res.id);
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hp->opcode = op;
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hp->rd = (_res.options & RES_RECURSE) != 0;
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hp->rcode = NOERROR;
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cp = buf + HFIXEDSZ;
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buflen -= HFIXEDSZ;
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dpp = dnptrs;
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*dpp++ = buf;
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*dpp++ = NULL;
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lastdnptr = dnptrs + sizeof(dnptrs) / sizeof(dnptrs[0]);
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/*
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* perform opcode specific processing
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*/
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switch (op) {
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case QUERY: /*FALLTHROUGH*/
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case NS_NOTIFY_OP:
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if ((buflen -= QFIXEDSZ) < 0)
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return (-1);
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if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
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return (-1);
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cp += n;
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buflen -= n;
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__putshort(type, cp);
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cp += sizeof(u_int16_t);
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__putshort(class, cp);
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cp += sizeof(u_int16_t);
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hp->qdcount = htons(1);
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if (op == QUERY || data == NULL)
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break;
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/*
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* Make an additional record for completion domain.
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*/
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buflen -= RRFIXEDSZ;
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if ((n = dn_comp((const char *)data, cp, buflen, dnptrs,
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lastdnptr)) < 0)
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return (-1);
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cp += n;
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buflen -= n;
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__putshort(T_NULL, cp);
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cp += sizeof(u_int16_t);
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__putshort(class, cp);
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cp += sizeof(u_int16_t);
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__putlong(0, cp);
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cp += sizeof(u_int32_t);
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__putshort(0, cp);
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cp += sizeof(u_int16_t);
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hp->arcount = htons(1);
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break;
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case IQUERY:
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/*
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* Initialize answer section
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*/
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if (buflen < 1 + RRFIXEDSZ + datalen)
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return (-1);
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*cp++ = '\0'; /* no domain name */
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__putshort(type, cp);
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cp += sizeof(u_int16_t);
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__putshort(class, cp);
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cp += sizeof(u_int16_t);
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__putlong(0, cp);
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cp += sizeof(u_int32_t);
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__putshort(datalen, cp);
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cp += sizeof(u_int16_t);
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if (datalen) {
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(void)memcpy(cp, data, (size_t)datalen);
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cp += datalen;
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}
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hp->ancount = htons(1);
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break;
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default:
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return (-1);
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}
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return (cp - buf);
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}
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#ifdef RES_USE_EDNS0
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/* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
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int
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res_opt(n0, buf, buflen, anslen)
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int n0;
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u_char *buf; /* buffer to put query */
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int buflen; /* size of buffer */
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int anslen; /* answer buffer length */
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{
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register HEADER *hp;
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register u_char *cp;
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hp = (HEADER *)(void *)buf;
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cp = buf + n0;
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buflen -= n0;
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if (buflen < 1 + RRFIXEDSZ)
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return -1;
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*cp++ = 0; /* "." */
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buflen--;
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__putshort(T_OPT, cp); /* TYPE */
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cp += INT16SZ;
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__putshort(anslen & 0xffff, cp); /* CLASS = UDP payload size */
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cp += INT16SZ;
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*cp++ = NOERROR; /* extended RCODE */
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*cp++ = 0; /* EDNS version */
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__putshort(0, cp); /* MBZ */
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cp += INT16SZ;
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__putshort(0, cp); /* RDLEN */
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cp += INT16SZ;
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hp->arcount = htons(ntohs(hp->arcount) + 1);
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buflen -= RRFIXEDSZ;
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return cp - buf;
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}
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#endif
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