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LookupServer: Retry with 0x20 randomization turned off on EREFUSED

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Apparently some authoritative servers don't handle 0x20 randomization
well and may send EREFUSED. Retry with randomization turned off then.

Reference: https://github.com/dns-violations/dns-violations/blob/master/2017/DVE-2017-0006.md

More work towards #10.
This commit is contained in:
Andreas Kling 2020-01-26 13:45:15 +01:00
parent 00be9b33b1
commit a9ec2225a5
6 changed files with 48 additions and 11 deletions
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4
Servers/LookupServer/DNSResponse.cpp
View file

@ -44,6 +44,10 @@ Optional<DNSResponse> DNSResponse::from_raw_response(const u8* raw_data, size_t
DNSResponse response;
response.m_id = response_header.id();
response.m_code = response_header.response_code();
if (response.code() != DNSResponse::Code::NOERROR)
return response;
size_t offset = sizeof(DNSPacket);