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Brendan Creane 0b4c0f2080 net/dns/resolver: treat DNS REFUSED responses as soft errors in forwarder race (#19053) ... When racing multiple upstream DNS resolvers, a REFUSED (RCode 5) response from a broken or misconfigured resolver could win the race and be returned to the client before healthier resolvers had a chance to respond with a valid answer. This caused complete DNS failure in cases where, e.g., a broken upstream resolver returned REFUSED quickly while a working resolver (such as 1.1.1.1) was still responding. Previously, only SERVFAIL (RCode 2) was treated as a soft error. REFUSED responses were returned as successful bytes and could win the race immediately. This change also treats REFUSED as a soft error in the UDP and TCP forwarding paths, so the race continues until a better answer arrives. If all resolvers refuse, the first REFUSED response is returned to the client. Additionally, SERVFAIL responses from upstream resolvers are now returned verbatim to the client rather than replaced with a locally synthesized packet. Synthesized SERVFAIL responses were authoritative and guaranteed to include a question section echoing the original query; upstream responses carry no such guarantees but may include extended error information (e.g. RFC 8914 extended DNS errors) that would otherwise be lost. Fixes #19024 Signed-off-by: Brendan Creane <bcreane@gmail.com>		4 weeks ago
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debug.go	all: remove AUTHORS file and references to it	3 months ago
doh_test.go	all: remove AUTHORS file and references to it	3 months ago
forwarder.go	net/dns/resolver: treat DNS REFUSED responses as soft errors in forwarder race (#19053)	4 weeks ago
forwarder_test.go	net/dns/resolver: treat DNS REFUSED responses as soft errors in forwarder race (#19053)	4 weeks ago
macios_ext.go	all: remove AUTHORS file and references to it	3 months ago
tsdns.go	net/dns/resolver: treat DNS REFUSED responses as soft errors in forwarder race (#19053)	4 weeks ago
tsdns_server_test.go	all: remove AUTHORS file and references to it	3 months ago
tsdns_test.go	net/dns/resolver: treat DNS REFUSED responses as soft errors in forwarder race (#19053)	4 weeks ago