public Task <DNS.Protocol.IResponse> Resolve(DNS.Protocol.IRequest request, CancellationToken cancellationToken = default)
{
DNS.Protocol.IResponse response = DNS.Protocol.Response.FromRequest(request);
foreach (var question in response.Questions)
{
if (question.Type == DNS.Protocol.RecordType.A)
{
var client = new DnsClient.LookupClient(DnsClient.NameServer.GooglePublicDns);
client.UseTcpOnly = true;
client.UseCache = true;
try
{
var result = client.Query(question.Name.ToString(), DnsClient.QueryType.A);
foreach (var item in result.Answers.ARecords())
{
response.AnswerRecords.Add(new DNS.Protocol.ResourceRecords.IPAddressResourceRecord(question.Name, item.Address));
}
}
catch (Exception)
{
// 跳过
}
}
else if (question.Type == DNS.Protocol.RecordType.AAAA)
{
var client = new DnsClient.LookupClient(DnsClient.NameServer.GooglePublicDns);
client.UseTcpOnly = true;
client.UseCache = true;
try
{
var result = client.Query(question.Name.ToString(), DnsClient.QueryType.AAAA);
foreach (var item in result.Answers.AaaaRecords())
{
response.AnswerRecords.Add(new DNS.Protocol.ResourceRecords.IPAddressResourceRecord(question.Name, item.Address));
}
}
catch (Exception)
{
// 跳过
}
}
else
{
// 跳过
}
}
return(Task.FromResult(response));
}
static void serverRequested(DNS.Protocol.IRequest request)
{
//this function called whenn DNS request is received
}
static void serverResponded(DNS.Protocol.IRequest request, DNS.Protocol.IResponse response)
{
//called when dns response is send
}
