mdw@git.distorted.org.uk Git - adns/blob - src/types.c

   1 /*
   2  * types.c
   3  * - RR-type-specific code, and the machinery to call it
   4  */
   5 /*
   6  *  This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2, or (at your option)
  11  *  any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software Foundation,
  20  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  */
  22
  23 #include "internal.h"
  24
  25 static adns_status rp_inaddr(adns_state ads, adns_query qu, int serv,
  26                              const byte *dgram, int dglen, int cbyte, int max,
  27                              void *store_r) {
  28   struct in_addr *dr= store_r;
  29
  30   if (max-cbyte != 4) return adns_s_invaliddata;
  31   memcpy(dr,dgram+cbyte,4);
  32   return adns_s_ok;
  33 }
  34
  35 static adns_status rmf_null(adns_state ads, adns_query qu, void *data) { }
  36
  37 #define TYPE_SF(size,func,free)    size, rp_#func, rmf_#free
  38 #define TYPE_SN(size,func)         size, rp_#func, rmf_null
  39 #define TYPESZ_M(member)           (sizeof(((adns_answer*)0)->rrs.member))
  40 #define TYPE_MF(member,parse)      TYPE_SF(TYPESZ_M(member),parse,member)
  41 #define TYPE_MN(member,parse)      TYPE_SN(TYPESZ_M(member),parse)
  42
  43 /* TYPE_<ms><nf>
  44  *  ms is M  specify member name
  45  *     or S  specify size explicitly
  46  *  nf is F  full memory management, dependent on member name or specified func
  47  *        N  no memory management required
  48  */
  49
  50 static const typeinfo typeinfos[] = {
  51   /* Must be in ascending order of rrtype ! */
  52   /* rr type code     name             style     member     size  parser */
  53
  54   {  adns_r_a,        "A",             TYPE_MN(  inaddr,          inaddr       ) },
  55 #if 0 /*fixme*/
  56   {  adns_r_ns_raw,   "NS(raw)",       TYPE_MF(  str,             domain_raw   ) },
  57   {  adns_r_cname,    "CNAME",         TYPE_MF(  str,             domain_raw   ) },
  58   {  adns_r_soa_raw,  "SOA(raw)",      TYPE_MF(  soa,             soa          ) },
  59   {  adns_r_null,     "NULL",          TYPE_SN(              0,   null         ) },
  60   {  adns_r_ptr_raw,  "PTR(raw)",      TYPE_MF(  str,             domain_raw   ) },
  61   {  adns_r_hinfo,    "HINFO",         TYPE_MF(  strpair,         hinfo        ) },
  62   {  adns_r_mx_raw,   "MX(raw)",       TYPE_MF(  intstr,          mx_raw       ) },
  63   {  adns_r_txt,      "TXT",           TYPE_MF(  str,             txt          ) },
  64   {  adns_r_rp_raw,   "RP(raw)",       TYPE_MF(  strpair,         rp           ) },
  65
  66   {  adns_r_ns,       "NS(+addr)",     TYPE_MF(  dmaddr,          dmaddr       ) },
  67   {  adns_r_ptr,      "PTR(checked)",  TYPE_MF(  str,             ptr          ) },
  68   {  adns_r_mx,       "MX(+addr)",     TYPE_MF(  intdmaddr,       mx           ) },
  69
  70   {  adns_r_soa,      "SOA(822)",      TYPE_MF(  soa,             soa          ) },
  71   {  adns_r_rp,       "RP(822)",       TYPE_MF(  strpair,         rp           ) },
  72 #endif
  73 };
  74
  75 const typeinfo adns__findtype(adns_rrtype type) {
  76   const typeinfo *begin, *end;
  77
  78   begin= typeinfos;  end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
  79
  80   while (begin < end) {
  81     mid= begin + ((end-begin)>>1);
  82     if (mid->type == type) return mid;
  83     if (type > mid->type) begin= mid+1;
  84     else end= mid;
  85   }
  86   return 0;
  87 }