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net: dns: Ignore queries when resolving a name

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It might happen that while we are waiting for the response
to one of our query, we receive a query to resolve another name.
Previously this would make the current name resolution to fail because
only responses were expected to be received.

Signed-off-by: Léonard Bise <leonard.bise@gmail.com>
This commit is contained in:
Léonard Bise 2020-06-10 15:28:42 +02:00 • committed by Jukka Rissanen
commit 7b869f0392
1 changed files with 8 additions and 0 deletions
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8
subsys/net/lib/dns/resolve.c
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@ -406,6 +406,14 @@ static int dns_read(struct dns_resolve_context *ctx,
goto quit;
}
/* We might receive a query while we are waiting for a response, in that
* case we just ignore the query instead of making the resolving fail.
*/
if (dns_header_qr(dns_msg.msg) == DNS_QUERY) {
ret = 0;
goto quit;
}
ret = dns_unpack_response_header(&dns_msg, *dns_id);
if (ret < 0) {
ret = DNS_EAI_FAIL;