207 lines
5.1 KiB
C
207 lines
5.1 KiB
C
/*
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* Copyright (c) 1996,1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Modified by Hotbird64 for use with vlmcs.
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*/
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#ifndef CONFIG
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#define CONFIG "config.h"
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#endif // CONFIG
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#include CONFIG
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#ifdef DNS_PARSER_INTERNAL
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#ifndef NO_DNS
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/* Import. */
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#include <sys/types.h>
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#include <errno.h>
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#include <string.h>
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#include "types.h"
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#include "endian.h"
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#include "ns_name.h"
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#include "ns_parse.h"
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/* Macros. */
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#define NS_GET16_VLMCSD(s, cp) do { \
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(s) = GET_UA16BE(cp); \
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(cp) += NS_INT16SZ; \
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} while (0)
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#define NS_GET32_VLMCSD(l, cp) do { \
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(l) = GET_UA32BE(cp); \
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(cp) += NS_INT32SZ; \
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} while (0)
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#define RETERR(err) do { errno = (err); return (-1); } while (0)
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/* Forward. */
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static void setsection_vlmcsd(ns_msg_vlmcsd *msg, ns_sect_vlmcsd sect);
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static int dn_skipname_vlmcsd(const unsigned char *s, const unsigned char *end)
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{
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const unsigned char *p;
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for (p=s; p<end; p++)
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if (!*p) return p-s+1;
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else if (*p>=192)
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{if (p+1<end) return p-s+2;
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else break;}
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return -1;
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}
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static int
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ns_skiprr_vlmcsd(const uint8_t *ptr, const uint8_t *eom, ns_sect_vlmcsd section, int count) {
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const uint8_t *optr = ptr;
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for ((void)NULL; count > 0; count--) {
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int b, rdlength;
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b = dn_skipname_vlmcsd(ptr, eom);
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if (b < 0)
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RETERR(EMSGSIZE);
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ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
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if (section != ns_s_qd_vlmcsd) {
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if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
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RETERR(EMSGSIZE);
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ptr += NS_INT32SZ/*TTL*/;
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NS_GET16_VLMCSD(rdlength, ptr);
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ptr += rdlength/*RData*/;
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}
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}
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if (ptr > eom)
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RETERR(EMSGSIZE);
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return (ptr - optr);
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}
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int
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ns_initparse_vlmcsd(const uint8_t *msg, int msglen, ns_msg_vlmcsd *handle) {
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const uint8_t *eom = msg + msglen;
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int i;
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memset(handle, 0x5e, sizeof *handle);
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handle->_msg = msg;
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handle->_eom = eom;
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if (msg + NS_INT16SZ > eom)
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RETERR(EMSGSIZE);
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NS_GET16_VLMCSD(handle->_id, msg);
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if (msg + NS_INT16SZ > eom)
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RETERR(EMSGSIZE);
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NS_GET16_VLMCSD(handle->_flags, msg);
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for (i = 0; i < ns_s_max_vlmcsd; i++) {
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if (msg + NS_INT16SZ > eom)
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RETERR(EMSGSIZE);
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NS_GET16_VLMCSD(handle->_counts[i], msg);
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}
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for (i = 0; i < ns_s_max_vlmcsd; i++)
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if (handle->_counts[i] == 0)
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handle->_sections[i] = NULL;
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else {
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int b = ns_skiprr_vlmcsd(msg, eom, (ns_sect_vlmcsd)i,
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handle->_counts[i]);
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if (b < 0)
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return (-1);
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handle->_sections[i] = msg;
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msg += b;
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}
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if (msg > eom)
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RETERR(EMSGSIZE);
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handle->_eom = msg;
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setsection_vlmcsd(handle, ns_s_max_vlmcsd);
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return (0);
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}
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int
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ns_parserr_vlmcsd(ns_msg_vlmcsd *handle, ns_sect_vlmcsd section, int rrnum, ns_rr_vlmcsd *rr) {
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int b;
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/* Make section right. */
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if (section >= ns_s_max_vlmcsd)
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RETERR(ENODEV);
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if (section != handle->_sect)
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setsection_vlmcsd(handle, section);
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/* Make rrnum right. */
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if (rrnum == -1)
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rrnum = handle->_rrnum;
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if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
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RETERR(ENODEV);
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if (rrnum < handle->_rrnum)
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setsection_vlmcsd(handle, section);
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if (rrnum > handle->_rrnum) {
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b = ns_skiprr_vlmcsd(handle->_msg_ptr, handle->_eom, section,
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rrnum - handle->_rrnum);
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if (b < 0)
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return (-1);
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handle->_msg_ptr += b;
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handle->_rrnum = rrnum;
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}
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/* Do the parse. */
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b = ns_name_uncompress_vlmcsd(handle->_msg, handle->_eom,
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handle->_msg_ptr, rr->name, NS_MAXDNAME);
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if (b < 0)
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return (-1);
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handle->_msg_ptr += b;
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if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
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RETERR(EMSGSIZE);
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NS_GET16_VLMCSD(rr->type, handle->_msg_ptr);
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NS_GET16_VLMCSD(rr->rr_class, handle->_msg_ptr);
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if (section == ns_s_qd_vlmcsd) {
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rr->ttl = 0;
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rr->rdlength = 0;
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rr->rdata = NULL;
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} else {
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if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
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RETERR(EMSGSIZE);
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NS_GET32_VLMCSD(rr->ttl, handle->_msg_ptr);
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NS_GET16_VLMCSD(rr->rdlength, handle->_msg_ptr);
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if (handle->_msg_ptr + rr->rdlength > handle->_eom)
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RETERR(EMSGSIZE);
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rr->rdata = handle->_msg_ptr;
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handle->_msg_ptr += rr->rdlength;
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}
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if (++handle->_rrnum > handle->_counts[(int)section])
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setsection_vlmcsd(handle, (ns_sect_vlmcsd)((int)section + 1));
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/* All done. */
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return (0);
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}
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/* Private. */
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static void
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setsection_vlmcsd(ns_msg_vlmcsd *msg, ns_sect_vlmcsd sect) {
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msg->_sect = sect;
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if (sect == ns_s_max_vlmcsd) {
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msg->_rrnum = -1;
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msg->_msg_ptr = NULL;
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} else {
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msg->_rrnum = 0;
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msg->_msg_ptr = msg->_sections[(int)sect];
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}
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}
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#endif // !NO_DNS
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#endif // DNS_PARSER_INTERNAL
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