次のように、A、MX、および NS A サーバー レコードを取得しようとしています。
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <resolv.h>
#include <netdb.h>
#define N 4096
int main (int argc, char *argv[])
{
u_char nsbuf[N];
char dispbuf[N];
ns_msg msg;
ns_rr rr;
int i, l;
if (argc < 2) {
printf ("Usage: %s <domain>\n", argv[0]);
exit (1);
}
// HEADER
printf("Domain : %s\n", argv[1]);
// ------
// A RECORD
printf("A records : \n");
l = res_query(argv[1], ns_c_any, ns_t_a, nsbuf, sizeof(nsbuf));
if (l < 0)
{
perror(argv[1]);
}
ns_initparse(nsbuf, l, &msg);
l = ns_msg_count(msg, ns_s_an);
for (i = 0; i < l; i++)
{
ns_parserr(&msg, ns_s_an, 0, &rr);
ns_sprintrr(&msg, &rr, NULL, NULL, dispbuf, sizeof(dispbuf));
printf("\t%s \n", dispbuf);
}
//------------
// MX RECORD
printf("MX records : \n");
l = res_query(argv[1], ns_c_any, ns_t_mx, nsbuf, sizeof(nsbuf));
if (l < 0)
{
perror(argv[1]);
}
else
{
#ifdef USE_PQUERY
/* this will give lots of detailed info on the request and reply */
res_pquery(&_res, nsbuf, l, stdout);
#else
/* just grab the MX answer info */
ns_initparse(nsbuf, l, &msg);
l = ns_msg_count(msg, ns_s_an);
for (i = 0; i < l; i++)
{
ns_parserr(&msg, ns_s_an, i, &rr);
ns_sprintrr(&msg, &rr, NULL, NULL, dispbuf, sizeof(dispbuf));
printf ("\t%s\n", dispbuf);
}
#endif
}
// ---------
// NS RECORD
printf("NS records : \n");
l = res_query(argv[1], ns_c_any, ns_t_ns, nsbuf, sizeof(nsbuf));
if (l < 0)
{
perror(argv[1]);
}
ns_initparse(nsbuf, l, &msg);
l = ns_msg_count(msg, ns_s_an);
for (i = 0; i < l; i++)
{
ns_parserr(&msg, ns_s_an, 0, &rr);
ns_sprintrr(&msg, &rr, NULL, NULL, dispbuf, sizeof(dispbuf));
printf("\t%s \n", dispbuf);
}
// ---------
return 0;
}
リクエストに応じて、同じもの、つまり同じ A レコードをたくさん受け取ります。NSレコードも同様。私は何を間違っていますか？例 ：
Domain : mail.ru
A records :
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
mail.ru. 22S IN A 94.100.191.207
MX records :
mail.ru. 1m57s IN MX 10 mxs.mail.ru.
NS records :
mail.ru. 1m50s IN NS ns.mail.ru.
mail.ru. 1m50s IN NS ns.mail.ru.
mail.ru. 1m50s IN NS ns.mail.ru.
mail.ru. 1m50s IN NS ns.mail.ru.
mail.ru. 1m50s IN NS ns.mail.ru.
mail.ru. 1m50s IN NS ns.mail.ru.
助けてください。