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

   1 /**/
   2
   3 #include "internal.h"
   4
   5 static adns_status rp_inaddr(adns_state ads, adns_query qu, int serv,
   6                              const byte *dgram, int dglen, int cbyte, int max,
   7                              void *store_r) {
   8   struct in_addr *dr= store_r;
   9
  10   if (max-cbyte != 4) return adns_s_invaliddata;
  11   memcpy(dr,dgram+cbyte,4);
  12   return adns_s_ok;
  13 }
  14
  15 static adns_status rmf_null(adns_state ads, adns_query qu, void *data) { }
  16
  17 #define TYPE_SF(size,func,free)    size, rp_#func, rmf_#free
  18 #define TYPE_SN(size,func)         size, rp_#func, rmf_null
  19 #define TYPESZ_M(member)           (sizeof(((adns_answer*)0)->rrs.member))
  20 #define TYPE_MF(member,parse)      TYPE_SF(TYPESZ_M(member),parse,member)
  21 #define TYPE_MN(member,parse)      TYPE_SN(TYPESZ_M(member),parse)
  22
  23 /* TYPE_<ms><nf>
  24  *  ms is M  specify member name
  25  *     or S  specify size explicitly
  26  *  nf is F  full memory management, dependent on member name or specified func
  27  *        N  no memory management required
  28  */
  29
  30 static const typeinfo typeinfos[] = {
  31   /* Must be in ascending order of rrtype ! */
  32   /* rr type code     name             style     member     size  parser */
  33
  34   {  adns_r_a,        "A",             TYPE_MN(  inaddr,          inaddr       ) },
  35 #if 0 /*fixme*/
  36   {  adns_r_ns_raw,   "NS(raw)",       TYPE_MF(  str,             domain_raw   ) },
  37   {  adns_r_cname,    "CNAME",         TYPE_MF(  str,             domain_raw   ) },
  38   {  adns_r_soa_raw,  "SOA(raw)",      TYPE_MF(  soa,             soa          ) },
  39   {  adns_r_null,     "NULL",          TYPE_SN(              0,   null         ) },
  40   {  adns_r_ptr_raw,  "PTR(raw)",      TYPE_MF(  str,             domain_raw   ) },
  41   {  adns_r_hinfo,    "HINFO",         TYPE_MF(  strpair,         hinfo        ) },
  42   {  adns_r_mx_raw,   "MX(raw)",       TYPE_MF(  intstr,          mx_raw       ) },
  43   {  adns_r_txt,      "TXT",           TYPE_MF(  str,             txt          ) },
  44   {  adns_r_rp_raw,   "RP(raw)",       TYPE_MF(  strpair,         rp           ) },
  45
  46   {  adns_r_ns,       "NS(+addr)",     TYPE_MF(  dmaddr,          dmaddr       ) },
  47   {  adns_r_ptr,      "PTR(checked)",  TYPE_MF(  str,             ptr          ) },
  48   {  adns_r_mx,       "MX(+addr)",     TYPE_MF(  intdmaddr,       mx           ) },
  49
  50   {  adns_r_soa,      "SOA(822)",      TYPE_MF(  soa,             soa          ) },
  51   {  adns_r_rp,       "RP(822)",       TYPE_MF(  strpair,         rp           ) },
  52 #endif
  53 };
  54
  55 const typeinfo adns__findtype(adns_rrtype type) {
  56   const typeinfo *begin, *end;
  57
  58   begin= typeinfos;  end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
  59
  60   while (begin < end) {
  61     mid= begin + ((end-begin)>>1);
  62     if (mid->type == type) return mid;
  63     if (type > mid->type) begin= mid+1;
  64     else end= mid;
  65   }
  66   return 0;
  67 }