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Connection Refused
2019-12-02 19:51:12 +08:00
commit b2ea730984
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Netch/Resolver.cs Normal file
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using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace Netch
{
public class Resolver : DNS.Client.RequestResolver.IRequestResolver
{
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);
}
}
}