public static (List <DnsRecordBase> list, ReturnCode statusCode) ResolveOverHttpsByDnsMsg(string clientIpAddress, string domainName, string dohUrl,
bool proxyEnable = false, IWebProxy wProxy = null, RecordType type = RecordType.A)
{
DnsMessage dnsMsg;
var dnsBase64String = Convert.ToBase64String(MyDnsSend.GetQuestionData(domainName.TrimEnd('.'), type)).TrimEnd('=')
.Replace('+', '-').Replace('/', '_');
try
{
var dnsDataBytes = MyCurl.GetData(
$"{dohUrl}?ct=application/dns-message&dns={dnsBase64String}",
DnsSettings.Http2Enable, proxyEnable, wProxy, DnsSettings.AllowAutoRedirect);
dnsMsg = DnsMessage.Parse(dnsDataBytes);
if (DnsSettings.Ipv4Disable || DnsSettings.Ipv6Disable)
{
foreach (var item in dnsMsg.AnswerRecords.ToArray())
{
if (item.RecordType == RecordType.A && DnsSettings.Ipv4Disable)
{
dnsMsg.AnswerRecords.Remove(item);
}
if (item.RecordType == RecordType.Aaaa && DnsSettings.Ipv6Disable)
{
dnsMsg.AnswerRecords.Remove(item);
}
}
}
}
catch (WebException e)
{
HttpWebResponse response = (HttpWebResponse)e.Response;
try
{
BackgroundLog(
$@"| - Catch WebException : {Convert.ToInt32(response.StatusCode)} {response.StatusCode} | {domainName} | {dohUrl} | {dnsBase64String}");
if (response.StatusCode == HttpStatusCode.BadRequest)
{
DnsSettings.DnsMsgEnable = false;
return(ResolveOverHttpsByDnsJson(clientIpAddress, domainName, DnsSettings.SecondHttpsDnsUrl,
proxyEnable, wProxy, type));
}
}
catch (Exception exception)
{
BackgroundLog(
$@"| - Catch WebException : {exception.Message} | {domainName} | {dohUrl} | {dnsBase64String}");
}
if (dohUrl != DnsSettings.HttpsDnsUrl)
{
return(new List <DnsRecordBase>(), ReturnCode.ServerFailure);
}
BackgroundLog($@"| -- SecondDoH : {DnsSettings.SecondHttpsDnsUrl}");
return(ResolveOverHttpsByDnsMsg(clientIpAddress, domainName, DnsSettings.SecondHttpsDnsUrl,
proxyEnable, wProxy, type));
}
return(dnsMsg.AnswerRecords, dnsMsg.ReturnCode);
}
private static (List <DnsRecordBase> list, ReturnCode statusCode) ResolveOverHttpsByDnsMsg(string clientIpAddress, string domainName, string dohUrl,
bool proxyEnable = false, IWebProxy wProxy = null, RecordType type = RecordType.A)
{
DnsMessage dnsMsg;
MWebClient mWebClient = new MWebClient {
Headers = { ["User-Agent"] = "AuroraDNSC/0.1" }
};
if (proxyEnable)
{
mWebClient.Proxy = wProxy;
}
var dnsBase64String = Convert.ToBase64String(MyDnsSend.GetQuestionData(domainName.TrimEnd('.'), type)).TrimEnd('=')
.Replace('+', '-').Replace('/', '_');
try
{
var dnsDataBytes = mWebClient.DownloadData(
$"{dohUrl}?ct=application/dns-message&dns={dnsBase64String}&edns_client_subnet={clientIpAddress}");
dnsMsg = DnsMessage.Parse(dnsDataBytes);
}
catch (WebException e)
{
HttpWebResponse response = (HttpWebResponse)e.Response;
try
{
BackgroundLog($@"| - Catch WebException : {Convert.ToInt32(response.StatusCode)} {response.StatusCode} | {domainName} | {dohUrl} | {dnsBase64String}");
if (response.StatusCode == HttpStatusCode.BadRequest)
{
DnsSettings.DnsMsgEnable = false;
return(ResolveOverHttpsByDnsJson(clientIpAddress, domainName, DnsSettings.SecondHttpsDnsUrl,
proxyEnable, wProxy, type));
}
}
catch (Exception exception)
{
BackgroundLog($@"| - Catch WebException : {exception.Message} | {domainName} | {dohUrl} | {dnsBase64String}");
}
if (dohUrl != DnsSettings.HttpsDnsUrl)
{
return(new List <DnsRecordBase>(), ReturnCode.ServerFailure);
}
BackgroundLog($@"| -- SecondDoH : {DnsSettings.SecondHttpsDnsUrl}");
return(ResolveOverHttpsByDnsMsg(clientIpAddress, domainName, DnsSettings.SecondHttpsDnsUrl,
proxyEnable, wProxy, type));
}
return(dnsMsg.AnswerRecords, dnsMsg.ReturnCode);
}
