private IReadOnlyList <DnsResourceRecord> GetAnswers(string domain, DnsQuestionRecord question, string zoneName, uint appRecordTtl, string healthCheck)
{
HealthCheckStatus status = _healthMonitor.QueryStatus(domain, question.Type, healthCheck, true);
if (status is null)
{
if (question.Name.Equals(zoneName, StringComparison.OrdinalIgnoreCase)) //check for zone apex
{
return new DnsResourceRecord[] { new DnsResourceRecord(question.Name, DnsResourceRecordType.ANAME, DnsClass.IN, 30, new DnsANAMERecord(domain)) }
}
; //use ANAME
else
{
return new DnsResourceRecord[] { new DnsResourceRecord(question.Name, DnsResourceRecordType.CNAME, DnsClass.IN, 30, new DnsCNAMERecord(domain)) }
};
}
else if (status.IsHealthy)
{
if (question.Name.Equals(zoneName, StringComparison.OrdinalIgnoreCase)) //check for zone apex
{
return new DnsResourceRecord[] { new DnsResourceRecord(question.Name, DnsResourceRecordType.ANAME, DnsClass.IN, appRecordTtl, new DnsANAMERecord(domain)) }
}
; //use ANAME
else
{
return new DnsResourceRecord[] { new DnsResourceRecord(question.Name, DnsResourceRecordType.CNAME, DnsClass.IN, appRecordTtl, new DnsCNAMERecord(domain)) }
};
}
return(null);
}
private void GetAnswers(dynamic jsonAddresses, DnsQuestionRecord question, uint appRecordTtl, string healthCheck, List <DnsResourceRecord> answers)
{
if (jsonAddresses == null)
{
return;
}
switch (question.Type)
{
case DnsResourceRecordType.A:
foreach (dynamic jsonAddress in jsonAddresses)
{
IPAddress address = IPAddress.Parse(jsonAddress.Value);
if (address.AddressFamily == AddressFamily.InterNetwork)
{
HealthCheckStatus status = _healthMonitor.QueryStatus(address, healthCheck, true);
if (status is null)
{
answers.Add(new DnsResourceRecord(question.Name, DnsResourceRecordType.A, question.Class, 30, new DnsARecord(address)));
}
else if (status.IsHealthy)
{
answers.Add(new DnsResourceRecord(question.Name, DnsResourceRecordType.A, question.Class, appRecordTtl, new DnsARecord(address)));
}
}
}
break;
case DnsResourceRecordType.AAAA:
foreach (dynamic jsonAddress in jsonAddresses)
{
IPAddress address = IPAddress.Parse(jsonAddress.Value);
if (address.AddressFamily == AddressFamily.InterNetworkV6)
{
HealthCheckStatus status = _healthMonitor.QueryStatus(address, healthCheck, true);
if (status is null)
{
answers.Add(new DnsResourceRecord(question.Name, DnsResourceRecordType.AAAA, question.Class, 30, new DnsAAAARecord(address)));
}
else if (status.IsHealthy)
{
answers.Add(new DnsResourceRecord(question.Name, DnsResourceRecordType.AAAA, question.Class, appRecordTtl, new DnsAAAARecord(address)));
}
}
}
break;
}
}