while it's not clearly documented anywhere, this is the historical
behavior which some applications expect. applications which need to
see the response packet in these cases, for example to distinguish
between nonexistence in a secure vs insecure zone, must already use
res_mkquery with res_send in order to be portable, since most if not
all other implementations of res_query don't provide it.
+#define _BSD_SOURCE
#include <resolv.h>
#include <netdb.h>
unsigned char q[280];
int ql = __res_mkquery(0, name, class, type, 0, 0, 0, q, sizeof q);
if (ql < 0) return ql;
- return __res_send(q, ql, dest, len);
+ int r = __res_send(q, ql, dest, len);
+ if (r<12) {
+ h_errno = TRY_AGAIN;
+ return -1;
+ }
+ if ((dest[3] & 15) == 3) {
+ h_errno = HOST_NOT_FOUND;
+ return -1;
+ }
+ if ((dest[3] & 15) == 0 && !dest[6] && !dest[7]) {
+ h_errno = NO_DATA;
+ return -1;
+ }
+ return r;
}
weak_alias(res_query, res_search);