From 93af473e0882827ab86a5697e559a122661d6327 Mon Sep 17 00:00:00 2001 From: Nick Peng Date: Tue, 8 Nov 2022 23:31:15 +0800 Subject: [PATCH] dns_cache: optimize cache for no result record. --- src/dns_server.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/dns_server.c b/src/dns_server.c index e4a7ab7..542e84f 100644 --- a/src/dns_server.c +++ b/src/dns_server.c @@ -2909,6 +2909,11 @@ static void _dns_server_query_end(struct dns_request *request) request->has_ping_result = 1; _dns_server_request_complete(request); } + + /* If upstream return noting but NOERROR, force NOERROR */ + if (ip_num == 0 && request_wait == 1 && request->remote_server_fail == 0 && request->has_soa == 0) { + request->rcode = DNS_RC_NOERROR; + } out: _dns_server_request_release(request); }