| Current Path : /usr/src/lib/libc/resolv/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/lib/libc/resolv/res_mkquery.c |
/*
* Copyright (c) 1985, 1993
* The 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.
* 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.
*/
/*
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Portions Copyright (c) 1996-1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
static const char rcsid[] = "$Id: res_mkquery.c,v 1.5.18.2 2008/04/03 23:15:15 marka Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/lib/libc/resolv/res_mkquery.c 186090 2008-12-14 19:39:53Z ume $");
#include "port_before.h"
#include <sys/types.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <string.h>
#include "port_after.h"
/* Options. Leave them on. */
#define DEBUG
extern const char *_res_opcodes[];
/*%
* Form all types of queries.
* Returns the size of the result or -1.
*/
int
res_nmkquery(res_state statp,
int op, /*!< opcode of query */
const char *dname, /*!< domain name */
int class, int type, /*!< class and type of query */
const u_char *data, /*!< resource record data */
int datalen, /*!< length of data */
const u_char *newrr_in, /*!< new rr for modify or append */
u_char *buf, /*!< buffer to put query */
int buflen) /*!< size of buffer */
{
HEADER *hp;
u_char *cp, *ep;
int n;
u_char *dnptrs[20], **dpp, **lastdnptr;
UNUSED(newrr_in);
#ifdef DEBUG
if (statp->options & RES_DEBUG)
printf(";; res_nmkquery(%s, %s, %s, %s)\n",
_res_opcodes[op], dname, p_class(class), p_type(type));
#endif
/*
* Initialize header fields.
*/
if ((buf == NULL) || (buflen < HFIXEDSZ))
return (-1);
memset(buf, 0, HFIXEDSZ);
hp = (HEADER *) buf;
hp->id = htons(++statp->id);
hp->opcode = op;
hp->rd = (statp->options & RES_RECURSE) != 0U;
hp->rcode = NOERROR;
cp = buf + HFIXEDSZ;
ep = buf + buflen;
dpp = dnptrs;
*dpp++ = buf;
*dpp++ = NULL;
lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
/*
* perform opcode specific processing
*/
switch (op) {
case QUERY: /*FALLTHROUGH*/
case NS_NOTIFY_OP:
if (ep - cp < QFIXEDSZ)
return (-1);
if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
lastdnptr)) < 0)
return (-1);
cp += n;
ns_put16(type, cp);
cp += INT16SZ;
ns_put16(class, cp);
cp += INT16SZ;
hp->qdcount = htons(1);
if (op == QUERY || data == NULL)
break;
/*
* Make an additional record for completion domain.
*/
if ((ep - cp) < RRFIXEDSZ)
return (-1);
n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
dnptrs, lastdnptr);
if (n < 0)
return (-1);
cp += n;
ns_put16(T_NULL, cp);
cp += INT16SZ;
ns_put16(class, cp);
cp += INT16SZ;
ns_put32(0, cp);
cp += INT32SZ;
ns_put16(0, cp);
cp += INT16SZ;
hp->arcount = htons(1);
break;
case IQUERY:
/*
* Initialize answer section
*/
if (ep - cp < 1 + RRFIXEDSZ + datalen)
return (-1);
*cp++ = '\0'; /*%< no domain name */
ns_put16(type, cp);
cp += INT16SZ;
ns_put16(class, cp);
cp += INT16SZ;
ns_put32(0, cp);
cp += INT32SZ;
ns_put16(datalen, cp);
cp += INT16SZ;
if (datalen) {
memcpy(cp, data, datalen);
cp += datalen;
}
hp->ancount = htons(1);
break;
default:
return (-1);
}
return (cp - buf);
}
#ifdef RES_USE_EDNS0
/* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
int
res_nopt(res_state statp,
int n0, /*%< current offset in buffer */
u_char *buf, /*%< buffer to put query */
int buflen, /*%< size of buffer */
int anslen) /*%< UDP answer buffer size */
{
HEADER *hp;
u_char *cp, *ep;
u_int16_t flags = 0;
#ifdef DEBUG
if ((statp->options & RES_DEBUG) != 0U)
printf(";; res_nopt()\n");
#endif
hp = (HEADER *) buf;
cp = buf + n0;
ep = buf + buflen;
if ((ep - cp) < 1 + RRFIXEDSZ)
return (-1);
*cp++ = 0; /*%< "." */
ns_put16(ns_t_opt, cp); /*%< TYPE */
cp += INT16SZ;
if (anslen > 0xffff)
anslen = 0xffff; /* limit to 16bit value */
ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */
cp += INT16SZ;
*cp++ = NOERROR; /*%< extended RCODE */
*cp++ = 0; /*%< EDNS version */
if (statp->options & RES_USE_DNSSEC) {
#ifdef DEBUG
if (statp->options & RES_DEBUG)
printf(";; res_opt()... ENDS0 DNSSEC\n");
#endif
flags |= NS_OPT_DNSSEC_OK;
}
ns_put16(flags, cp);
cp += INT16SZ;
ns_put16(0U, cp); /*%< RDLEN */
cp += INT16SZ;
hp->arcount = htons(ntohs(hp->arcount) + 1);
return (cp - buf);
}
/*
* Construct variable data (RDATA) block for OPT psuedo-RR, append it
* to the buffer, then update the RDLEN field (previously set to zero by
* res_nopt()) with the new RDATA length.
*/
int
res_nopt_rdata(res_state statp,
int n0, /*%< current offset in buffer */
u_char *buf, /*%< buffer to put query */
int buflen, /*%< size of buffer */
u_char *rdata, /*%< ptr to start of opt rdata */
u_short code, /*%< OPTION-CODE */
u_short len, /*%< OPTION-LENGTH */
u_char *data) /*%< OPTION_DATA */
{
register u_char *cp, *ep;
#ifdef DEBUG
if ((statp->options & RES_DEBUG) != 0U)
printf(";; res_nopt_rdata()\n");
#endif
cp = buf + n0;
ep = buf + buflen;
if ((ep - cp) < (4 + len))
return (-1);
if (rdata < (buf + 2) || rdata >= ep)
return (-1);
ns_put16(code, cp);
cp += INT16SZ;
ns_put16(len, cp);
cp += INT16SZ;
memcpy(cp, data, len);
cp += len;
len = cp - rdata;
ns_put16(len, rdata - 2); /* Update RDLEN field */
return (cp - buf);
}
#endif
/*! \file */