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DnsServer: updated ProcessUdpRequestAsync() to remove glue for SRV, SVCB and HTTPS along with MX when response is getting truncated. Updated PostProcessQueryAsync(), RecursiveResolveAsync(), and PrepareRecursiveResolveResponse() to support ECS for all record types.

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This commit is contained in:
Shreyas Zare
2023-05-20 18:08:18 +05:30
parent f4f2529b54
commit aa950351c0
1 changed files with 7 additions and 3 deletions
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10
DnsServerCore/Dns/DnsServer.cs
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@@ -444,7 +444,11 @@ namespace DnsServerCore.Dns
switch (response.Question[0].Type)
{
case DnsResourceRecordType.MX:
case DnsResourceRecordType.SRV:
case DnsResourceRecordType.SVCB:
case DnsResourceRecordType.HTTPS:
//removing glue records and trying again since some mail servers fail to fallback to TCP on truncation
//removing glue records to prevent truncation for SRV/SVCB/HTTPS
response = response.CloneWithoutGlueRecords();
sendBufferStream.Position = 0;
@@ -1044,7 +1048,7 @@ namespace DnsServerCore.Dns
IReadOnlyList<EDnsOption> options = null;
EDnsClientSubnetOptionData requestECS = request.GetEDnsClientSubnetOption(true);
if ((requestECS is not null) && (request.Question.Count == 1) && CacheZone.IsTypeSupportedForEDnsClientSubnet(request.Question[0].Type))
if (requestECS is not null)
options = EDnsClientSubnetOptionData.GetEDnsClientSubnetOption(requestECS.SourcePrefixLength, 0, requestECS.Address);
if (response.Additional.Count == 0)
@@ -2593,7 +2597,7 @@ namespace DnsServerCore.Dns
NetworkAddress eDnsClientSubnet = null;
bool conditionalForwardingClientSubnet = false;
if (_eDnsClientSubnet && CacheZone.IsTypeSupportedForEDnsClientSubnet(question.Type))
if (_eDnsClientSubnet)
{
EDnsClientSubnetOptionData requestECS = request.GetEDnsClientSubnetOption();
if (requestECS is null)
@@ -3234,7 +3238,7 @@ namespace DnsServerCore.Dns
if (response.GetEDnsClientSubnetOption(true) is not null)
{
//response contains ECS
if ((request.GetEDnsClientSubnetOption(true) is not null) && CacheZone.IsTypeSupportedForEDnsClientSubnet(request.Question[0].Type))
if (request.GetEDnsClientSubnetOption(true) is not null)
{
//request has ECS and type is supported; keep ECS in response
options = response.EDNS.Options;