f991bb5181
routines from contrib/bind directly. There were too many problems, including having to add -DUSE_OPTIONS_H to the entire libc source in order for the contrib code to pick up it's options, and so on. Instead, I've merged the changes, libc is now self contained again.
246 lines
7.2 KiB
C
246 lines
7.2 KiB
C
/*
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* ++Copyright++ 1985, 1993
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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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#if defined(LIBC_SCCS) && !defined(lint)
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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 8.4 1996/08/05 08:31:35 vixie Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include "res_config.h"
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#include <arpa/nameser.h>
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#include <stdio.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <string.h>
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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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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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#ifdef ALLOW_UPDATES
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struct rrec *newrr = (struct rrec *) newrr_in;
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#endif
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u_char *dnptrs[20], **dpp, **lastdnptr;
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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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if ((buf == NULL) || (buflen < HFIXEDSZ))
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return (-1);
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bzero(buf, HFIXEDSZ);
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hp = (HEADER *) 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 += INT16SZ;
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__putshort(class, cp);
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cp += INT16SZ;
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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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n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
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if (n < 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 += INT16SZ;
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__putshort(class, cp);
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cp += INT16SZ;
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__putlong(0, cp);
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cp += INT32SZ;
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__putshort(0, cp);
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cp += INT16SZ;
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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 += INT16SZ;
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__putshort(class, cp);
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cp += INT16SZ;
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__putlong(0, cp);
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cp += INT32SZ;
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__putshort(datalen, cp);
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cp += INT16SZ;
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if (datalen) {
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bcopy(data, cp, 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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#ifdef ALLOW_UPDATES
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/*
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* For UPDATEM/UPDATEMA, do UPDATED/UPDATEDA followed by UPDATEA
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* (Record to be modified is followed by its replacement in msg.)
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*/
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case UPDATEM:
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case UPDATEMA:
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case UPDATED:
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/*
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* The res code for UPDATED and UPDATEDA is the same; user
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* calls them differently: specifies data for UPDATED; server
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* ignores data if specified for UPDATEDA.
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*/
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case UPDATEDA:
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buflen -= RRFIXEDSZ + datalen;
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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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__putshort(type, cp);
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cp += INT16SZ;
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__putshort(class, cp);
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cp += INT16SZ;
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__putlong(0, cp);
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cp += INT32SZ;
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__putshort(datalen, cp);
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cp += INT16SZ;
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if (datalen) {
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bcopy(data, cp, datalen);
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cp += datalen;
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}
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if ( (op == UPDATED) || (op == UPDATEDA) ) {
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hp->ancount = htons(0);
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break;
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}
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/* Else UPDATEM/UPDATEMA, so drop into code for UPDATEA */
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case UPDATEA: /* Add new resource record */
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buflen -= RRFIXEDSZ + datalen;
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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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__putshort(newrr->r_type, cp);
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cp += INT16SZ;
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__putshort(newrr->r_class, cp);
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cp += INT16SZ;
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__putlong(0, cp);
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cp += INT32SZ;
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__putshort(newrr->r_size, cp);
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cp += INT16SZ;
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if (newrr->r_size) {
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bcopy(newrr->r_data, cp, newrr->r_size);
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cp += newrr->r_size;
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}
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hp->ancount = htons(0);
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break;
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#endif /* ALLOW_UPDATES */
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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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