etc/Windows/vlmcsd_old_vancepym/ns_parse.c

   1 /*
   2  * Copyright (c) 1996,1999 by Internet Software Consortium.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
   9  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  10  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  11  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  12  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  13  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  14  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  15  * SOFTWARE.
  16  */
  17
  18 /*
  19  * Modified by Hotbird64 for use with vlmcs.
  20  */
  21
  22 #ifndef CONFIG
  23 #define CONFIG "config.h"
  24 #endif // CONFIG
  25 #include CONFIG
  26
  27 #ifdef DNS_PARSER_INTERNAL
  28 #ifndef NO_DNS
  29
  30 /* Import. */
  31
  32 #include <sys/types.h>
  33 #include <errno.h>
  34 #include <string.h>
  35
  36 #include "types.h"
  37 #include "endian.h"
  38 #include "ns_name.h"
  39 #include "ns_parse.h"
  40
  41 /* Macros. */
  42
  43 #define NS_GET16_VLMCSD(s, cp) do { \
  44         (s) = GET_UA16BE(cp); \
  45         (cp) += NS_INT16SZ; \
  46 } while (0)
  47
  48 #define NS_GET32_VLMCSD(l, cp) do { \
  49         (l) = GET_UA32BE(cp); \
  50         (cp) += NS_INT32SZ; \
  51 } while (0)
  52
  53 #define RETERR(err) do { errno = (err); return (-1); } while (0)
  54
  55 /* Forward. */
  56
  57 static void     setsection_vlmcsd(ns_msg_vlmcsd *msg, ns_sect_vlmcsd sect);
  58
  59
  60 static int dn_skipname_vlmcsd(const unsigned char *s, const unsigned char *end)
  61 {
  62         const unsigned char *p;
  63         for (p=s; p<end; p++)
  64                 if (!*p) return p-s+1;
  65                 else if (*p>=192)
  66                         {if (p+1<end) return p-s+2;
  67                         else break;}
  68         return -1;
  69 }
  70
  71 static int
  72 ns_skiprr_vlmcsd(const uint8_t *ptr, const uint8_t *eom, ns_sect_vlmcsd section, int count) {
  73         const uint8_t *optr = ptr;
  74
  75         for ((void)NULL; count > 0; count--) {
  76                 int b, rdlength;
  77
  78                 b = dn_skipname_vlmcsd(ptr, eom);
  79                 if (b < 0)
  80                         RETERR(EMSGSIZE);
  81                 ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
  82                 if (section != ns_s_qd_vlmcsd) {
  83                         if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
  84                                 RETERR(EMSGSIZE);
  85                         ptr += NS_INT32SZ/*TTL*/;
  86                         NS_GET16_VLMCSD(rdlength, ptr);
  87                         ptr += rdlength/*RData*/;
  88                 }
  89         }
  90         if (ptr > eom)
  91                 RETERR(EMSGSIZE);
  92         return (ptr - optr);
  93 }
  94
  95 int
  96 ns_initparse_vlmcsd(const uint8_t *msg, int msglen, ns_msg_vlmcsd *handle) {
  97         const uint8_t *eom = msg + msglen;
  98         int i;
  99
 100         memset(handle, 0x5e, sizeof *handle);
 101         handle->_msg = msg;
 102         handle->_eom = eom;
 103         if (msg + NS_INT16SZ > eom)
 104                 RETERR(EMSGSIZE);
 105         NS_GET16_VLMCSD(handle->_id, msg);
 106         if (msg + NS_INT16SZ > eom)
 107                 RETERR(EMSGSIZE);
 108         NS_GET16_VLMCSD(handle->_flags, msg);
 109         for (i = 0; i < ns_s_max_vlmcsd; i++) {
 110                 if (msg + NS_INT16SZ > eom)
 111                         RETERR(EMSGSIZE);
 112                 NS_GET16_VLMCSD(handle->_counts[i], msg);
 113         }
 114         for (i = 0; i < ns_s_max_vlmcsd; i++)
 115                 if (handle->_counts[i] == 0)
 116                         handle->_sections[i] = NULL;
 117                 else {
 118                         int b = ns_skiprr_vlmcsd(msg, eom, (ns_sect_vlmcsd)i,
 119                                           handle->_counts[i]);
 120
 121                         if (b < 0)
 122                                 return (-1);
 123                         handle->_sections[i] = msg;
 124                         msg += b;
 125                 }
 126         if (msg > eom)
 127                 RETERR(EMSGSIZE);
 128         handle->_eom = msg;
 129         setsection_vlmcsd(handle, ns_s_max_vlmcsd);
 130         return (0);
 131 }
 132
 133 int
 134 ns_parserr_vlmcsd(ns_msg_vlmcsd *handle, ns_sect_vlmcsd section, int rrnum, ns_rr_vlmcsd *rr) {
 135         int b;
 136
 137         /* Make section right. */
 138         if (section >= ns_s_max_vlmcsd)
 139                 RETERR(ENODEV);
 140         if (section != handle->_sect)
 141                 setsection_vlmcsd(handle, section);
 142
 143         /* Make rrnum right. */
 144         if (rrnum == -1)
 145                 rrnum = handle->_rrnum;
 146         if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
 147                 RETERR(ENODEV);
 148         if (rrnum < handle->_rrnum)
 149                 setsection_vlmcsd(handle, section);
 150         if (rrnum > handle->_rrnum) {
 151                 b = ns_skiprr_vlmcsd(handle->_msg_ptr, handle->_eom, section,
 152                               rrnum - handle->_rrnum);
 153
 154                 if (b < 0)
 155                         return (-1);
 156                 handle->_msg_ptr += b;
 157                 handle->_rrnum = rrnum;
 158         }
 159
 160         /* Do the parse. */
 161         b = ns_name_uncompress_vlmcsd(handle->_msg, handle->_eom,
 162                       handle->_msg_ptr, rr->name, NS_MAXDNAME);
 163         if (b < 0)
 164                 return (-1);
 165         handle->_msg_ptr += b;
 166         if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
 167                 RETERR(EMSGSIZE);
 168         NS_GET16_VLMCSD(rr->type, handle->_msg_ptr);
 169         NS_GET16_VLMCSD(rr->rr_class, handle->_msg_ptr);
 170         if (section == ns_s_qd_vlmcsd) {
 171                 rr->ttl = 0;
 172                 rr->rdlength = 0;
 173                 rr->rdata = NULL;
 174         } else {
 175                 if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
 176                         RETERR(EMSGSIZE);
 177                 NS_GET32_VLMCSD(rr->ttl, handle->_msg_ptr);
 178                 NS_GET16_VLMCSD(rr->rdlength, handle->_msg_ptr);
 179                 if (handle->_msg_ptr + rr->rdlength > handle->_eom)
 180                         RETERR(EMSGSIZE);
 181                 rr->rdata = handle->_msg_ptr;
 182                 handle->_msg_ptr += rr->rdlength;
 183         }
 184         if (++handle->_rrnum > handle->_counts[(int)section])
 185                 setsection_vlmcsd(handle, (ns_sect_vlmcsd)((int)section + 1));
 186
 187         /* All done. */
 188         return (0);
 189 }
 190
 191 /* Private. */
 192
 193 static void
 194 setsection_vlmcsd(ns_msg_vlmcsd *msg, ns_sect_vlmcsd sect) {
 195         msg->_sect = sect;
 196         if (sect == ns_s_max_vlmcsd) {
 197                 msg->_rrnum = -1;
 198                 msg->_msg_ptr = NULL;
 199         } else {
 200                 msg->_rrnum = 0;
 201                 msg->_msg_ptr = msg->_sections[(int)sect];
 202         }
 203 }
 204
 205 #endif // !NO_DNS
 206 #endif // DNS_PARSER_INTERNAL