mirror of https://github.com/acidanthera/audk.git
227 lines
6.7 KiB
C
227 lines
6.7 KiB
C
/*
|
|
* Copyright (c) 1996 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.
|
|
*/
|
|
|
|
/*
|
|
* Portions copyright (c) 1999, 2000
|
|
* Intel Corporation.
|
|
* 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 Intel Corporation and
|
|
* its contributors.
|
|
*
|
|
* 4. Neither the name of Intel Corporation or its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION 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 INTEL CORPORATION 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.
|
|
*
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <arpa/nameser.h>
|
|
|
|
#include <errno.h>
|
|
#include <resolv.h>
|
|
#include <string.h>
|
|
|
|
/* 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). */
|
|
};
|
|
|
|
static int
|
|
skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
|
|
const u_char *optr = ptr;
|
|
|
|
for ((void)NULL; count > 0; count--) {
|
|
int b, rdlength;
|
|
|
|
b = dn_skipname(ptr, eom);
|
|
if (b < 0)
|
|
goto emsgsize;
|
|
ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
|
|
if (section != ns_s_qd) {
|
|
if (ptr + NS_INT32SZ > eom)
|
|
goto emsgsize;
|
|
ptr += NS_INT32SZ/*TTL*/;
|
|
if (ptr + NS_INT16SZ > eom)
|
|
goto emsgsize;
|
|
NS_GET16(rdlength, ptr);
|
|
ptr += rdlength/*RData*/;
|
|
}
|
|
}
|
|
if (ptr > eom)
|
|
goto emsgsize;
|
|
return ((int)(ptr - optr));
|
|
emsgsize:
|
|
errno = EMSGSIZE;
|
|
return (-1);
|
|
}
|
|
|
|
int
|
|
ns_initparse(const u_char *msg, int 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)
|
|
goto emsgsize;
|
|
NS_GET16(handle->_id, msg);
|
|
if (msg + NS_INT16SZ > eom)
|
|
goto emsgsize;
|
|
NS_GET16(handle->_flags, msg);
|
|
for (i = 0; i < ns_s_max; i++) {
|
|
if (msg + NS_INT16SZ > eom)
|
|
goto emsgsize;
|
|
NS_GET16(handle->_counts[i], msg);
|
|
}
|
|
for (i = 0; i < ns_s_max; i++)
|
|
if (handle->_counts[i] == 0)
|
|
handle->_sections[i] = NULL;
|
|
else {
|
|
int b = skiprr(msg, eom, (ns_sect)i,
|
|
handle->_counts[i]);
|
|
|
|
if (b < 0)
|
|
return (-1);
|
|
handle->_sections[i] = msg;
|
|
msg += b;
|
|
}
|
|
if (msg != eom)
|
|
goto emsgsize;
|
|
handle->_sect = ns_s_max;
|
|
handle->_rrnum = -1;
|
|
handle->_msg_ptr = NULL;
|
|
return (0);
|
|
emsgsize:
|
|
errno = EMSGSIZE;
|
|
return (-1);
|
|
}
|
|
|
|
int
|
|
ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
|
|
int b;
|
|
|
|
/* Make section right. */
|
|
if (section < 0 || section >= ns_s_max)
|
|
goto enodev;
|
|
if ((int)section != (int)handle->_sect) {
|
|
handle->_sect = section;
|
|
handle->_rrnum = 0;
|
|
handle->_msg_ptr = handle->_sections[(int)section];
|
|
}
|
|
|
|
/* Make rrnum right. */
|
|
if (rrnum == -1)
|
|
rrnum = handle->_rrnum;
|
|
if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
|
|
goto enodev;
|
|
if (rrnum < handle->_rrnum) {
|
|
handle->_rrnum = 0;
|
|
handle->_msg_ptr = handle->_sections[(int)section];
|
|
}
|
|
|
|
b = skiprr(handle->_msg, handle->_eom, section,
|
|
rrnum - handle->_rrnum);
|
|
if (b < 0)
|
|
return (-1);
|
|
handle->_msg_ptr += b;
|
|
handle->_rrnum = rrnum;
|
|
|
|
/* Do the parse. */
|
|
b = dn_expand(handle->_msg, handle->_eom,
|
|
handle->_msg_ptr, rr->name, NS_MAXDNAME);
|
|
if (b < 0)
|
|
return (-1);
|
|
handle->_msg_ptr += b;
|
|
if (handle->_msg_ptr + NS_INT16SZ > handle->_eom)
|
|
goto emsgsize;
|
|
NS_GET16(rr->type, handle->_msg_ptr);
|
|
if (handle->_msg_ptr + NS_INT16SZ > handle->_eom)
|
|
goto emsgsize;
|
|
NS_GET16(rr->rr_class, handle->_msg_ptr);
|
|
if (section == ns_s_qd) {
|
|
rr->ttl = 0;
|
|
rr->rdlength = 0;
|
|
rr->rdata = NULL;
|
|
} else {
|
|
if (handle->_msg_ptr + NS_INT32SZ > handle->_eom)
|
|
goto emsgsize;
|
|
NS_GET32(rr->ttl, handle->_msg_ptr);
|
|
if (handle->_msg_ptr + NS_INT16SZ > handle->_eom)
|
|
goto emsgsize;
|
|
NS_GET16(rr->rdlength, handle->_msg_ptr);
|
|
if (handle->_msg_ptr + rr->rdlength > handle->_eom)
|
|
goto emsgsize;
|
|
rr->rdata = handle->_msg_ptr;
|
|
handle->_msg_ptr += rr->rdlength;
|
|
}
|
|
handle->_rrnum++;
|
|
|
|
/* All done. */
|
|
return (0);
|
|
enodev:
|
|
errno = ENODEV;
|
|
return (-1);
|
|
emsgsize:
|
|
errno = EMSGSIZE;
|
|
return (-1);
|
|
}
|