305 lines
8.7 KiB
C
305 lines
8.7 KiB
C
/*
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* Portions Copyright (C) 2004, 2005, 2008 Internet Systems Consortium, Inc. ("ISC")
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* Portions Copyright (C) 1996, 1997, 1988, 1999, 2001, 2003 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or 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.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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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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* 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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/*
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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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#if defined(LIBC_SCCS) && !defined(lint)
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static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
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static const char rcsid[] = "$Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "port_before.h"
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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 <arpa/nameser.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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#include "port_after.h"
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/* Options. Leave them on. */
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#define DEBUG
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extern const char *_res_opcodes[];
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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_nmkquery(res_state statp,
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int op, /*!< opcode of query */
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const char *dname, /*!< domain name */
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int class, int 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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HEADER *hp;
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u_char *cp, *ep;
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int n;
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u_char *dnptrs[20], **dpp, **lastdnptr;
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UNUSED(newrr_in);
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#ifdef DEBUG
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if (statp->options & RES_DEBUG)
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printf(";; res_nmkquery(%s, %s, %s, %s)\n",
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_res_opcodes[op], dname, p_class(class), p_type(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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memset(buf, 0, HFIXEDSZ);
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hp = (HEADER *) buf;
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statp->id = res_nrandomid(statp);
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hp->id = htons(statp->id);
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hp->opcode = op;
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hp->rd = (statp->options & RES_RECURSE) != 0U;
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hp->rcode = NOERROR;
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cp = buf + HFIXEDSZ;
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ep = buf + buflen;
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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 (ep - cp < QFIXEDSZ)
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return (-1);
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if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
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lastdnptr)) < 0)
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return (-1);
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cp += n;
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ns_put16(type, cp);
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cp += INT16SZ;
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ns_put16(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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if ((ep - cp) < RRFIXEDSZ)
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return (-1);
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n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
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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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ns_put16(T_NULL, cp);
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cp += INT16SZ;
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ns_put16(class, cp);
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cp += INT16SZ;
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ns_put32(0, cp);
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cp += INT32SZ;
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ns_put16(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 (ep - cp < 1 + RRFIXEDSZ + datalen)
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return (-1);
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*cp++ = '\0'; /*%< no domain name */
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ns_put16(type, cp);
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cp += INT16SZ;
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ns_put16(class, cp);
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cp += INT16SZ;
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ns_put32(0, cp);
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cp += INT32SZ;
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ns_put16(datalen, cp);
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cp += INT16SZ;
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if (datalen) {
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memcpy(cp, data, 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_nopt(res_state statp,
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int n0, /*%< current offset in buffer */
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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) /*%< UDP answer buffer size */
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{
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HEADER *hp;
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u_char *cp, *ep;
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u_int16_t flags = 0;
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#ifdef DEBUG
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if ((statp->options & RES_DEBUG) != 0U)
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printf(";; res_nopt()\n");
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#endif
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hp = (HEADER *) buf;
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cp = buf + n0;
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ep = buf + buflen;
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if ((ep - cp) < 1 + RRFIXEDSZ)
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return (-1);
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*cp++ = 0; /*%< "." */
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ns_put16(ns_t_opt, cp); /*%< TYPE */
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cp += INT16SZ;
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if (anslen > 0xffff)
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anslen = 0xffff; /* limit to 16bit value */
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ns_put16(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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if (statp->options & RES_USE_DNSSEC) {
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#ifdef DEBUG
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if (statp->options & RES_DEBUG)
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printf(";; res_opt()... ENDS0 DNSSEC\n");
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#endif
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flags |= NS_OPT_DNSSEC_OK;
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}
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ns_put16(flags, cp);
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cp += INT16SZ;
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ns_put16(0U, cp); /*%< RDLEN */
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cp += INT16SZ;
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hp->arcount = htons(ntohs(hp->arcount) + 1);
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return (cp - buf);
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}
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/*
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* Construct variable data (RDATA) block for OPT psuedo-RR, append it
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* to the buffer, then update the RDLEN field (previously set to zero by
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* res_nopt()) with the new RDATA length.
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*/
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int
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res_nopt_rdata(res_state statp,
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int n0, /*%< current offset in buffer */
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u_char *buf, /*%< buffer to put query */
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int buflen, /*%< size of buffer */
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u_char *rdata, /*%< ptr to start of opt rdata */
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u_short code, /*%< OPTION-CODE */
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u_short len, /*%< OPTION-LENGTH */
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u_char *data) /*%< OPTION_DATA */
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{
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register u_char *cp, *ep;
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#ifdef DEBUG
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if ((statp->options & RES_DEBUG) != 0U)
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printf(";; res_nopt_rdata()\n");
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#endif
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cp = buf + n0;
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ep = buf + buflen;
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if ((ep - cp) < (4 + len))
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return (-1);
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if (rdata < (buf + 2) || rdata >= ep)
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return (-1);
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ns_put16(code, cp);
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cp += INT16SZ;
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ns_put16(len, cp);
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cp += INT16SZ;
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memcpy(cp, data, len);
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cp += len;
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len = cp - rdata;
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ns_put16(len, rdata - 2); /* Update RDLEN field */
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return (cp - buf);
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}
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#endif
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/*! \file */
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