public static bool Request(string extension)
{
IDnsQueryResponse result;
var endpoint = new IPEndPoint(IPAddress.Parse("8.8.8.8"), 53);
var client = new LookupClient(endpoint);
client.EnableAuditTrail = false;
try
{
result = client.Query(extension, QueryType.NS);
}
catch (Exception e)
{
Console.WriteLine("ERROR\tException: " + endpoint.Address.ToString() + "\t" + e);
return(false);
}
foreach (var NsRecord in result.Answers.NsRecords())
{
var result2 = client.Query(NsRecord.NSDName, QueryType.A);
if (result2.Answers.ARecords().Count() < 1)
{
return(false);
}
var ns = NsRecord.NSDName.ToString();
var ip = result2.Answers.ARecords()?.First()?.Address.ToString();
if (CheckSoaServer(extension, ip))
{
//Console.WriteLine("Ajout de {0} , {1}", ns, ip);
RootZone.Serveur serveur = new RootZone.Serveur {
Queries = 0, Fails = 0, Ip = ip, Ns = ns
};
RootZone.AddServer(extension, serveur);
}
//else Console.WriteLine("[DEBUG] Pas de SOA pour {0} sur {1}", extension, ip);
}
return(RootZone.ServerExists(extension));
}
/*
* public static async Task<Data> IsNsRecordedAsync(string domain, int timeout, string dnsserver = null)
* {
* Data output = new Data();
*
* byte[] bufferReceive = new byte[512];
* byte[] finalMessage = new byte[512];
* int currentId = 0;
* int port = 0;
* int rCode = 0;
* ushort answerCount = 0;
* ushort nsCount = 0;
* bool? aaFlag = null;
* int questionBytes = 0;
*
* DomainParser.Domain extension = DomainParser.DomainParser.Parse(domain);
*
* var items = domain.Split('.');
* if (extension.Extension == "") extension.Extension = items.Last();
*
* currentId = Interlocked.Increment(ref _queryNumber);
* if (RootZone.ServerExists(extension.Extension) && dnsserver != null)
* {
* RootZone.ServeursDns[extension.Extension].First(item => item.Ip == dnsserver).Queries++;
* }
* if (dnsserver == null)
* {
* output.log = "dnsserver is null";
* return output;
* }
*
* var header = new byte[] { 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0 };
* var tail = new byte[] { 0, 0, 2, 0, 1 };
* unchecked
* {
* header[0] = (byte)(currentId >> 8);
* header[1] = (byte)currentId;
* }
*
* var tempMessage = header.AsEnumerable();
*
* foreach (var item in items)
* {
* var itemBytes = Encoding.ASCII.GetBytes(item);
* var itemLen = new[] { (byte)item.Length };
* tempMessage = tempMessage.Concat(itemLen).Concat(itemBytes);
* }
*
* finalMessage = tempMessage.Concat(tail).ToArray();
* port = 15000 + (currentId % 50535);
*
*
* using (var socket = new UdpClient())
* {
* socket.Client.ReceiveTimeout = 500;
* socket.ExclusiveAddressUse = true;
* socket.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, false);
* var selectedBind = _sortie[currentId % _sortie.Length];
* //var ipendpt = new IPEndPoint(selectedBind, port);
* var ipendpt = new IPEndPoint(selectedBind, 0);
*
* var selectedServer = _dnsEndPoints[currentId % _dnsEndPoints.Length];
* if (dnsserver != null)
* {
* DnsServer.DnsServers = new string[] { dnsserver };
* selectedServer = new IPEndPoint(IPAddress.Parse(dnsserver), 53);
* }
* socket.Send(finalMessage, finalMessage.Length, selectedServer);
* try
* {
* bufferReceive = socket.Receive(ref ipendpt);
* //var tmp = await socket.ReceiveAsync().ConfigureAwait(false);
* /*
* var result = await Task.Run(() =>
* {
* var task = socket.ReceiveAsync();
* task.Wait(timeout);
* if (task.IsCompleted)
* { return task.Result; }
* throw new TimeoutException();
* }).ConfigureAwait(false);
*
* bufferReceive = result.Buffer;
*
* }
* catch (Exception e)
* {
* output.log = "[ERREUR socket receive]\t" + dnsserver + "\t" + port + "\t" + e;
* if (dnsserver != null) RootZone.ServeursDns[extension.Extension].First(item => item.Ip == dnsserver).Fails++;
* return output;
* }
* finally
* {
* socket.Close();
* }
* }
*
* bool areEqual = finalMessage.Take(2).ToArray().SequenceEqual(bufferReceive.Take(2).ToArray()); // true
* rCode = bufferReceive[3] & 0xF;
* aaFlag = (bufferReceive[2] & (1 << 6 - 1)) != 0;
* answerCount = BitConverter.ToUInt16(bufferReceive.Skip(6).Take(2).Reverse().ToArray(), 0);
* nsCount = BitConverter.ToUInt16(bufferReceive.Skip(8).Take(2).Reverse().ToArray(), 0);
* questionBytes = (items.Count() + domain.Length) + 4;
*
* // 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0
* bool authorityPointer = bufferReceive.Skip(12 + questionBytes).Take(2).SequenceEqual(new byte[2] { (byte)192, (byte)12 });
*
* if (dnsserver != null)
* output.log = domain + "\tServer: " + dnsserver + "\taaFlag: " + aaFlag.ToString() + "\trCode: " + rCode + "\tanswerCount: " + Convert.ToString((int)answerCount) + "\tNSCOUNT: " + Convert.ToString((int)nsCount) + "\tPointer: " + authorityPointer.ToString() + "\t" + BitConverter.ToString(new byte[2] { (byte)192, (byte)12 }) + "\tDNS: " + BitConverter.ToString(bufferReceive.Skip(12 + questionBytes).Take(2).ToArray());
* else
* output.log = domain + "\tServer: Google\taaFlag: " + aaFlag.ToString() + "\trCode: " + rCode + "\tanswerCount: " + Convert.ToString((int)answerCount) + "\tNSCOUNT: " + Convert.ToString((int)nsCount) + "\tDNS: " + BitConverter.ToString(bufferReceive.Skip(12 + questionBytes).Take(2).ToArray());
*
*
* // Je comprend pas, ça n'arrive jamais sous windoows, je n'ai ce comportement que sous linux avec mono... ca vient du core, du serveur , de sa config réseau?
* if (areEqual == false)
* {
* output.success = false;
* return output;
* }
* else output.success = true;
*
*
* output.result = ((rCode == 0 && (answerCount > 1 || (nsCount > 1 && dnsserver != null && authorityPointer))) == true);
*
* return output;
* }
*/
public static bool IsNsRecorded(string domain, string extension, int timeout, out bool result, out string log, string dnsserver = null)
{
result = false;
log = "";
byte[] bufferReceive = new byte[512];
byte[] finalMessage = new byte[512];
int currentId = 0;
int port = 0;
int rCode = 0;
ushort answerCount = 0;
ushort nsCount = 0;
bool? aaFlag = null;
int questionBytes = 0;
var items = domain.Split('.');
currentId = Interlocked.Increment(ref _queryNumber);
if (RootZone.ServerExists(extension) && dnsserver != null)
{
RootZone.ServeursDns[extension].First(item => item.Ip == dnsserver).Queries++;
}
if (dnsserver == null)
{
return(false);
}
var header = new byte[] { 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0 };
var tail = new byte[] { 0, 0, 2, 0, 1 };
unchecked
{
header[0] = (byte)(currentId >> 8);
header[1] = (byte)currentId;
}
var tempMessage = header.AsEnumerable();
foreach (var item in items)
{
var itemBytes = Encoding.ASCII.GetBytes(item);
var itemLen = new[] { (byte)item.Length };
tempMessage = tempMessage.Concat(itemLen).Concat(itemBytes);
}
finalMessage = tempMessage.Concat(tail).ToArray();
port = 15000 + (currentId % 50535);
using (var socket = new UdpClient())
//using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
{
socket.Client.ReceiveTimeout = timeout;
//socket.DontFragment = true;
socket.ExclusiveAddressUse = true;
socket.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, false);
//socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, timeout);
var selectedBind = _sortie[currentId % _sortie.Length];
//var ipendpt = new IPEndPoint(selectedBind, 45152 + (currentId % 16380));
var ipendpt = new IPEndPoint(selectedBind, port);
//var ipendpt = new IPEndPoint(selectedBind, 0);
var selectedServer = _dnsEndPoints[currentId % _dnsEndPoints.Length];
//var ipendpt = new IPEndPoint(selectedBind, port);
//socket.Bind(ipendpt);
//Console.WriteLine(domain + "\t / ip : " + ipendpt.Address + " port : " + ipendpt.Port);
if (dnsserver != null)
{
DnsServer.DnsServers = new string[] { dnsserver };
selectedServer = new IPEndPoint(IPAddress.Parse(dnsserver), 53);
}
try
{
socket.Send(finalMessage, finalMessage.Length, selectedServer);
//socket.SendTo(finalMessage, finalMessage.Length, SocketFlags.None, selectedServer);
}
catch (SocketException e)
{
Console.WriteLine(port + "\t" + e);
socket.Close();
return(false);
}
try
{
bufferReceive = socket.Receive(ref ipendpt);
//bufferReceive = await socket.ReceiveFromAsync(recvargs);
//socket.Receive(bufferReceive);
}
catch (SocketException e)
{
socket.Close();
log = "[ERROR] Exception\t" + dnsserver + "\t" + e;
var server = RootZone.ServeursDns[extension].FirstOrDefault(item => item.Ip == dnsserver);
if (dnsserver != null && server != null)
{
server.Fails++;
}
return(false);
}
finally
{
socket.Close();
}
}
//Console.WriteLine("[DEBUG] Query {0}\t\t\tusing\t{1} {2} {3}", domain, dnsserver, RootZone.ServeursDns[extension.Extension].First(item => item.Ip == dnsserver).Ip, RootZone.ServeursDns[extension.Extension].First(item => item.Ip == dnsserver).Ns);
bool areEqual = finalMessage.Take(2).ToArray().SequenceEqual(bufferReceive.Take(2).ToArray()); // true
rCode = bufferReceive[3] & 0xF;
aaFlag = (bufferReceive[2] & (1 << 6 - 1)) != 0;
answerCount = BitConverter.ToUInt16(bufferReceive.Skip(6).Take(2).Reverse().ToArray(), 0);
nsCount = BitConverter.ToUInt16(bufferReceive.Skip(8).Take(2).Reverse().ToArray(), 0);
questionBytes = (items.Count() + domain.Length) + 4;
// 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0
bool authorityPointer = bufferReceive.Skip(12 + questionBytes).Take(2).SequenceEqual(new byte[2] {
(byte)192, (byte)12
});
if (dnsserver != null)
{
log = domain + "\tServer: " + dnsserver + "\taaFlag: " + aaFlag.ToString() + "\trCode: " + rCode + "\tanswerCount: " + Convert.ToString((int)answerCount) + "\tNSCOUNT: " + Convert.ToString((int)nsCount) + "\tPointer: " + authorityPointer.ToString() + "\t" + BitConverter.ToString(new byte[2] {
(byte)192, (byte)12
}) + "\tDNS: " + BitConverter.ToString(bufferReceive.Skip(12 + questionBytes).Take(2).ToArray());
}
else
{
log = domain + "\tServer: Google\taaFlag: " + aaFlag.ToString() + "\trCode: " + rCode + "\tanswerCount: " + Convert.ToString((int)answerCount) + "\tNSCOUNT: " + Convert.ToString((int)nsCount) + "\tDNS: " + BitConverter.ToString(bufferReceive.Skip(12 + questionBytes).Take(2).ToArray());
}
/* Je comprend pas, ça n'arrive jamais sous windoows, je n'ai ce comportement que sous linux avec mono... ca vient du core, du serveur , de sa config réseau? */
if (areEqual == false)
{
WriteLog("[ERROR] Not Equal !", ConsoleColor.Red);
//Console.WriteLine(domain + "\tQ:\t" + BitConverter.ToString(finalMessage.ToArray()));
//Console.WriteLine(port + "\t" + currentId + "\t" + domain + "\tR:\t" + BitConverter.ToString(bufferReceive.ToArray()));
//if (dnsserver != null) RootZone.ServeursDns[extension.Extension].First(item => item.Ip == dnsserver).Fails++;
return(false);
}
result = false;
if (rCode == 0 && (answerCount > 1 || (nsCount > 1 && dnsserver != null && authorityPointer)))
{
result = true;
}
return(true);
}
