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resolv: Implement no-aaaa stub resolver option

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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2022-06-24 18:16:41 +02:00
parent 62a321b12d
commit f282cdbe7f
12 changed files with 785 additions and 12 deletions
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24
resolv/res_query.c
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@@ -204,10 +204,26 @@ __res_context_query (struct resolv_context *ctx, const char *name,
free (buf);
return (n);
}
assert (answerp == NULL || (void *) *answerp == (void *) answer);
n = __res_context_send (ctx, query1, nquery1, query2, nquery2, answer,
anslen, answerp, answerp2, nanswerp2, resplen2,
answerp2_malloced);
/* Suppress AAAA lookups if required. __res_handle_no_aaaa
checks RES_NOAAAA first, so avoids parsing the
just-generated query packet in most cases. nss_dns avoids
using T_QUERY_A_AND_AAAA in RES_NOAAAA mode, so there is no
need to handle it here. */
if (type == T_AAAA && __res_handle_no_aaaa (ctx, query1, nquery1,
answer, anslen, &n))
/* There must be no second query for AAAA queries. The code
below is still needed to translate NODATA responses. */
assert (query2 == NULL);
else
{
assert (answerp == NULL || (void *) *answerp == (void *) answer);
n = __res_context_send (ctx, query1, nquery1, query2, nquery2,
answer, anslen,
answerp, answerp2, nanswerp2, resplen2,
answerp2_malloced);
}
if (use_malloc)
free (buf);
if (n < 0) {