* Copyright (c) 1985 Regents of the University of California.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid
[] = "@(#)res_mkquery.c 6.16 (Berkeley) 3/6/91";
#endif /* LIBC_SCCS and not lint */
#include <arpa/nameser.h>
* Form all types of queries.
* Returns the size of the result or -1.
res_mkquery(op
, dname
, class, type
, data
, datalen
, newrr
, buf
, buflen
)
int op
; /* opcode of query */
const char *dname
; /* domain name */
int class, type
; /* class and type of query */
const char *data
; /* resource record data */
int datalen
; /* length of data */
const struct rrec
*newrr
; /* new rr for modify or append */
char *buf
; /* buffer to put query */
int buflen
; /* size of buffer */
char *dnptrs
[10], **dpp
, **lastdnptr
;
if (_res
.options
& RES_DEBUG
)
printf("res_mkquery(%d, %s, %d, %d)\n", op
, dname
, class, type
);
* Initialize header fields.
if ((buf
== NULL
) || (buflen
< sizeof(HEADER
)))
bzero(buf
, sizeof(HEADER
));
hp
->id
= htons(++_res
.id
);
hp
->pr
= (_res
.options
& RES_PRIMARY
) != 0;
hp
->rd
= (_res
.options
& RES_RECURSE
) != 0;
cp
= buf
+ sizeof(HEADER
);
buflen
-= sizeof(HEADER
);
lastdnptr
= dnptrs
+ sizeof(dnptrs
)/sizeof(dnptrs
[0]);
* perform opcode specific processing
if ((buflen
-= QFIXEDSZ
) < 0)
if ((n
= dn_comp((u_char
*)dname
, (u_char
*)cp
, buflen
,
(u_char
**)dnptrs
, (u_char
**)lastdnptr
)) < 0)
__putshort(type
, (u_char
*)cp
);
__putshort(class, (u_char
*)cp
);
if (op
== QUERY
|| data
== NULL
)
* Make an additional record for completion domain.
if ((n
= dn_comp((u_char
*)data
, (u_char
*)cp
, buflen
,
(u_char
**)dnptrs
, (u_char
**)lastdnptr
)) < 0)
__putshort(T_NULL
, (u_char
*)cp
);
__putshort(class, (u_char
*)cp
);
__putlong(0, (u_char
*)cp
);
__putshort(0, (u_char
*)cp
);
* Initialize answer section
if (buflen
< 1 + RRFIXEDSZ
+ datalen
)
*cp
++ = '\0'; /* no domain name */
__putshort(type
, (u_char
*)cp
);
__putshort(class, (u_char
*)cp
);
__putlong(0, (u_char
*)cp
);
__putshort(datalen
, (u_char
*)cp
);
bcopy(data
, cp
, datalen
);
* For UPDATEM/UPDATEMA, do UPDATED/UPDATEDA followed by UPDATEA
* (Record to be modified is followed by its replacement in msg.)
* The res code for UPDATED and UPDATEDA is the same; user
* calls them differently: specifies data for UPDATED; server
* ignores data if specified for UPDATEDA.
buflen
-= RRFIXEDSZ
+ datalen
;
if ((n
= dn_comp(dname
, cp
, buflen
, dnptrs
, lastdnptr
)) < 0)
bcopy(data
, cp
, datalen
);
if ( (op
== UPDATED
) || (op
== UPDATEDA
) ) {
/* Else UPDATEM/UPDATEMA, so drop into code for UPDATEA */
case UPDATEA
: /* Add new resource record */
buflen
-= RRFIXEDSZ
+ datalen
;
if ((n
= dn_comp(dname
, cp
, buflen
, dnptrs
, lastdnptr
)) < 0)
__putshort(newrr
->r_type
, cp
);
__putshort(newrr
->r_class
, cp
);
__putshort(newrr
->r_size
, cp
);
bcopy(newrr
->r_data
, cp
, newrr
->r_size
);