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/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996-2003 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.
*
* Internet Systems Consortium, Inc.
* 950 Charter Street
* Redwood City, CA 94063
* <info@isc.org>
* http://www.isc.org/
*/
#ifndef lint
static const char rcsid[] = "$Id: ns_parse.c,v 1.3 2005/03/17 20:15:17 dhankins Exp $";
#endif
/* Import. */
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <errno.h>
#include <string.h>
#include "minires/minires.h"
#include "arpa/nameser.h"
/* Forward. */
static void setsection(ns_msg *msg, ns_sect sect);
/* Macros. */
/* Public. */
/* These need to be in the same order as the nres.h:ns_flag enum. */
struct _ns_flagdata _ns_flagdata[16] = {
{ 0x8000, 15 }, /* qr. */
{ 0x7800, 11 }, /* opcode. */
{ 0x0400, 10 }, /* aa. */
{ 0x0200, 9 }, /* tc. */
{ 0x0100, 8 }, /* rd. */
{ 0x0080, 7 }, /* ra. */
{ 0x0040, 6 }, /* z. */
{ 0x0020, 5 }, /* ad. */
{ 0x0010, 4 }, /* cd. */
{ 0x000f, 0 }, /* rcode. */
{ 0x0000, 0 }, /* expansion (1/6). */
{ 0x0000, 0 }, /* expansion (2/6). */
{ 0x0000, 0 }, /* expansion (3/6). */
{ 0x0000, 0 }, /* expansion (4/6). */
{ 0x0000, 0 }, /* expansion (5/6). */
{ 0x0000, 0 }, /* expansion (6/6). */
};
isc_result_t
ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count,
int *rc) {
const u_char *optr = ptr;
for ((void)NULL; count > 0; count--) {
int b, rdlength;
b = dn_skipname(ptr, eom);
if (b < 0)
return ISC_R_INCOMPLETE;
ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
if (section != ns_s_qd) {
if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
return ISC_R_INCOMPLETE;
ptr += NS_INT32SZ/*TTL*/;
rdlength = getUShort(ptr);
ptr += 2;
ptr += rdlength/*RData*/;
}
}
if (ptr > eom)
return ISC_R_INCOMPLETE;
if (rc)
*rc = ptr - optr;
return ISC_R_SUCCESS;
}
isc_result_t
ns_initparse(const u_char *msg, unsigned msglen, ns_msg *handle) {
const u_char *eom = msg + msglen;
int i;
memset(handle, 0x5e, sizeof *handle);
handle->_msg = msg;
handle->_eom = eom;
if (msg + NS_INT16SZ > eom)
return ISC_R_INCOMPLETE;
handle->_id = getUShort (msg);
msg += 2;
if (msg + NS_INT16SZ > eom)
return ISC_R_INCOMPLETE;
handle->_flags = getUShort (msg);
msg += 2;
for (i = 0; i < ns_s_max; i++) {
if (msg + NS_INT16SZ > eom)
return ISC_R_INCOMPLETE;
handle->_counts[i] = getUShort (msg);
msg += 2;
}
for (i = 0; i < ns_s_max; i++)
if (handle->_counts[i] == 0)
handle->_sections[i] = NULL;
else {
int b;
isc_result_t status =
ns_skiprr(msg, eom, (ns_sect)i,
handle->_counts[i], &b);
if (status != ISC_R_SUCCESS)
return STATUS;
handle->_sections[i] = msg;
msg += b;
}
if (msg != eom)
return ISC_R_INCOMPLETE;
setsection(handle, ns_s_max);
return ISC_R_SUCCESS;
}
isc_result_t
ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
int b;
isc_result_t status;
/* Make section right. */
if (section < 0 || section >= ns_s_max)
return ISC_R_NOTIMPLEMENTED;
if (section != handle->_sect)
setsection(handle, section);
/* Make rrnum right. */
if (rrnum == -1)
rrnum = handle->_rrnum;
if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
return ISC_R_UNKNOWNATTRIBUTE;
if (rrnum < handle->_rrnum)
setsection(handle, section);
if (rrnum > handle->_rrnum) {
status = ns_skiprr(handle->_ptr, handle->_eom, section,
rrnum - handle->_rrnum, &b);
if (status != ISC_R_SUCCESS)
return status;
handle->_ptr += b;
handle->_rrnum = rrnum;
}
/* Do the parse. */
b = dn_expand(handle->_msg, handle->_eom,
handle->_ptr, rr->name, NS_MAXDNAME);
if (b < 0)
return ISC_R_FORMERR;
handle->_ptr += b;
if (handle->_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
return ISC_R_INCOMPLETE;
rr->type = getUShort (handle->_ptr);
handle -> _ptr += 2;
rr->rr_class = getUShort (handle->_ptr);
handle -> _ptr += 2;
if (section == ns_s_qd) {
rr->ttl = 0;
rr->rdlength = 0;
rr->rdata = NULL;
} else {
if (handle->_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
return ISC_R_INCOMPLETE;
rr->ttl = getULong (handle->_ptr);
handle -> _ptr += 4;
rr->rdlength = getUShort (handle->_ptr);
handle -> _ptr += 2;
if (handle->_ptr + rr->rdlength > handle->_eom)
return ISC_R_INCOMPLETE;
rr->rdata = handle->_ptr;
handle->_ptr += rr->rdlength;
}
if (++handle->_rrnum > handle->_counts[(int)section])
setsection(handle, (ns_sect)((int)section + 1));
/* All done. */
return ISC_R_SUCCESS;
}
/* Private. */
static void
setsection(ns_msg *msg, ns_sect sect) {
msg->_sect = sect;
if (sect == ns_s_max) {
msg->_rrnum = -1;
msg->_ptr = NULL;
} else {
msg->_rrnum = 0;
msg->_ptr = msg->_sections[(int)sect];
}
}
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