darling-libresolv/res_mkquery.c
Thomas A e67010e4cc Move Source From Main Repo
Not sure what version this is based on...
2023-02-02 21:59:01 -08:00

272 lines
8.0 KiB
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.
* 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.
*/
/*
* 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.
*/
/*
* 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM 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 1.1 2006/03/01 19:01:38 majka Exp $";
#endif /* LIBC_SCCS and not lint */
#ifndef __APPLE__
#include "port_before.h"
#endif
#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 "res_private.h"
#ifndef __APPLE__
#include "port_after.h"
#endif
/* 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 */
{
register HEADER *hp;
register u_char *cp;
register int n;
u_char *dnptrs[20], **dpp, **lastdnptr;
#ifdef __APPLE__
n = 0;
#else
UNUSED(newrr_in);
#endif
#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 < NS_HFIXEDSZ))
return (-1);
memset(buf, 0, NS_HFIXEDSZ);
hp = (HEADER *) buf;
#ifdef __APPLE__
hp->id = res_randomid();
#else
hp->id = htons(++statp->id);
#endif
hp->opcode = op;
hp->rd = (statp->options & RES_RECURSE) != 0;
hp->rcode = ns_r_noerror;
cp = buf + NS_HFIXEDSZ;
buflen -= NS_HFIXEDSZ;
dpp = dnptrs;
*dpp++ = buf;
*dpp++ = NULL;
lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
/*
* perform opcode specific processing
*/
switch (op) {
case ns_o_query: /*FALLTHROUGH*/
case ns_o_update:
if ((buflen -= NS_QFIXEDSZ) < 0)
return (-1);
if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
return (-1);
cp += n;
buflen -= n;
putshort(type, cp);
cp += NS_INT16SZ;
putshort(class, cp);
cp += NS_INT16SZ;
hp->qdcount = htons(1);
if (op == ns_o_query || data == NULL)
break;
/*
* Make an additional record for completion domain.
*/
buflen -= NS_RRFIXEDSZ;
n = dn_comp((const char *)data, cp, buflen, dnptrs, lastdnptr);
if (n < 0)
return (-1);
cp += n;
buflen -= n;
putshort(ns_t_null, cp);
cp += NS_INT16SZ;
putshort(class, cp);
cp += NS_INT16SZ;
putlong(0, cp);
cp += NS_INT32SZ;
putshort(0, cp);
cp += NS_INT16SZ;
hp->arcount = htons(1);
break;
case ns_o_iquery:
/*
* Initialize answer section
*/
if (buflen < 1 + NS_RRFIXEDSZ + datalen)
return (-1);
*cp++ = '\0'; /* no domain name */
putshort(type, cp);
cp += NS_INT16SZ;
putshort(class, cp);
cp += NS_INT16SZ;
putlong(0, cp);
cp += NS_INT32SZ;
putshort(datalen, cp);
cp += NS_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). */
#ifndef T_OPT
#define T_OPT 41
#endif
int
res_nopt(statp, n0, buf, buflen, anslen)
res_state statp;
int n0;
u_char *buf; /* buffer to put query */
int buflen; /* size of buffer */
int anslen; /* answer buffer length */
{
register HEADER *hp;
register u_char *cp;
u_int16_t flags = 0;
#ifdef DEBUG
if ((statp->options & RES_DEBUG) != 0)
printf(";; res_nopt()\n");
#endif
hp = (HEADER *) buf;
cp = buf + n0;
buflen -= n0;
if (buflen < 1 + NS_RRFIXEDSZ)
return -1;
*cp++ = 0; /* "." */
buflen--;
putshort(T_OPT, cp); /* TYPE */
cp += NS_INT16SZ;
putshort(anslen & 0xffff, cp); /* CLASS = UDP payload size */
cp += NS_INT16SZ;
*cp++ = ns_r_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;
}
putshort(flags, cp);
cp += NS_INT16SZ;
putshort(0, cp); /* RDLEN */
cp += NS_INT16SZ;
hp->arcount = htons(ntohs(hp->arcount) + 1);
buflen -= NS_RRFIXEDSZ;
return cp - buf;
}
#endif