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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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3
Servers/LookupServer/LookupServer.h
View file

@ -26,6 +26,7 @@
#pragma once
#include "DNSRequest.h"
#include <AK/HashMap.h>
#include <AK/RefPtr.h>
#include <AK/String.h>
@ -44,7 +45,7 @@ public:
private:
void load_etc_hosts();
void service_client(RefPtr<CLocalSocket>);
Vector<String> lookup(const String& hostname, bool& did_timeout, unsigned short record_type);
Vector<String> lookup(const String& hostname, bool& did_timeout, unsigned short record_type, ShouldRandomizeCase = ShouldRandomizeCase::Yes);
int make_dns_request_socket(sockaddr_in& dst_addr);