src/network/res_query.c

   1 #define _BSD_SOURCE
   2 #include <resolv.h>
   3 #include <netdb.h>
   4
   5 int res_query(const char *name, int class, int type, unsigned char *dest, int len)
   6 {
   7         unsigned char q[280];
   8         int ql = __res_mkquery(0, name, class, type, 0, 0, 0, q, sizeof q);
   9         if (ql < 0) return ql;
  10         int r = __res_send(q, ql, dest, len);
  11         if (r<12) {
  12                 h_errno = TRY_AGAIN;
  13                 return -1;
  14         }
  15         if ((dest[3] & 15) == 3) {
  16                 h_errno = HOST_NOT_FOUND;
  17                 return -1;
  18         }
  19         if ((dest[3] & 15) == 0 && !dest[6] && !dest[7]) {
  20                 h_errno = NO_DATA;
  21                 return -1;
  22         }
  23         return r;
  24 }
  25
  26 weak_alias(res_query, res_search);