/// <summary>
/// Queries server with specified query.
/// </summary>
/// <param name="queryText">Query text. It depends on queryType.</param>
/// <param name="queryType">Query type.</param>
/// <param name="timeout">Query timeout in milli seconds.</param>
/// <returns>Returns DSN server response.</returns>
public DnsServerResponse Query(string queryText, DNS_QType queryType, int timeout)
{
DnsServerResponse retVal = null;
ManualResetEvent wait = new ManualResetEvent(false);
DNS_ClientTransaction transaction = CreateTransaction(queryType, queryText, timeout);
transaction.Timeout += delegate(object s, EventArgs e)
{
wait.Set();
};
transaction.StateChanged += delegate(object s1, EventArgs <DNS_ClientTransaction> e1)
{
if (transaction.State == DNS_ClientTransactionState.Completed || transaction.State == DNS_ClientTransactionState.Disposed)
{
retVal = transaction.Response;
wait.Set();
}
};
transaction.Start();
// Wait transaction to complete.
wait.WaitOne();
return(retVal);
}
/// <summary>
/// Processes received UDP packet.
/// </summary>
/// <param name="e">UDP packet.</param>
private void ProcessUdpPacket(UDP_e_PacketReceived e)
{
try
{
if (m_IsDisposed)
{
return;
}
DnsServerResponse serverResponse = ParseQuery(e.Buffer);
DNS_ClientTransaction transaction = null;
// Pass response to transaction.
if (m_pTransactions.TryGetValue(serverResponse.ID, out transaction))
{
if (transaction.State == DNS_ClientTransactionState.Active)
{
// Cache query.
if (m_UseDnsCache && serverResponse.ResponseCode == DNS_RCode.NO_ERROR)
{
DnsCache.AddToCache(transaction.QName, (int)transaction.QType, serverResponse);
}
transaction.ProcessResponse(serverResponse);
}
}
// No such transaction or transaction has timed out before answer received.
//else{
//}
}
catch
{
// We don't care about receiving errors here, skip them.
}
}
/// <summary>
/// Creates new DNS client transaction.
/// </summary>
/// <param name="queryType">Query type.</param>
/// <param name="queryText">Query text. It depends on queryType.</param>
/// <param name="timeout">Transaction timeout in milliseconds. DNS default value is 2000, value 0 means no timeout - this is not suggested.</param>
/// <returns>Returns DNS client transaction.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>queryText</b> is null reference.</exception>
/// <exception cref="ArgumentException">Is raised when any of the arguments has invalid value.</exception>
/// <remarks>Creates asynchronous(non-blocking) DNS transaction. Call <see cref="DNS_ClientTransaction.Start"/> to start transaction.
/// It is allowd to create multiple conccurent transactions.</remarks>
public DNS_ClientTransaction CreateTransaction(DNS_QType queryType,string queryText,int timeout)
{
if(queryType == DNS_QType.PTR){
IPAddress ip = null;
if(!IPAddress.TryParse(queryText,out ip)){
throw new ArgumentException("Argument 'queryText' value must be IP address if queryType == DNS_QType.PTR.","queryText");
}
}
if(queryText == null){
throw new ArgumentNullException("queryText");
}
if(queryText == string.Empty){
throw new ArgumentException("Argument 'queryText' value may not be \"\".","queryText");
}
if(queryType == DNS_QType.PTR){
string ip = queryText;
// See if IP is ok.
IPAddress ipA = IPAddress.Parse(ip);
queryText = "";
// IPv6
if(ipA.AddressFamily == AddressFamily.InterNetworkV6){
// 4321:0:1:2:3:4:567:89ab
// would be
// b.a.9.8.7.6.5.0.4.0.0.0.3.0.0.0.2.0.0.0.1.0.0.0.0.0.0.0.1.2.3.4.IP6.ARPA
char[] ipChars = ip.Replace(":","").ToCharArray();
for(int i=ipChars.Length - 1;i>-1;i--){
queryText += ipChars[i] + ".";
}
queryText += "IP6.ARPA";
}
// IPv4
else{
// 213.35.221.186
// would be
// 186.221.35.213.in-addr.arpa
string[] ipParts = ip.Split('.');
//--- Reverse IP ----------
for(int i=3;i>-1;i--){
queryText += ipParts[i] + ".";
}
queryText += "in-addr.arpa";
}
}
DNS_ClientTransaction retVal = new DNS_ClientTransaction(this,new Random().Next(0xFFFF),queryType,queryText,timeout);
retVal.StateChanged += delegate(object s1,EventArgs<DNS_ClientTransaction> e1){
if(retVal.State == DNS_ClientTransactionState.Completed){
m_pTransactions.Remove(e1.Value.ID);
}
};
m_pTransactions.Add(retVal.ID,retVal);
return retVal;
}
/// <summary>
/// Creates new DNS client transaction.
/// </summary>
/// <param name="queryType">Query type.</param>
/// <param name="queryText">Query text. It depends on queryType.</param>
/// <param name="timeout">Transaction timeout in milliseconds. DNS default value is 2000, value 0 means no timeout - this is not suggested.</param>
/// <returns>Returns DNS client transaction.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>queryText</b> is null reference.</exception>
/// <exception cref="ArgumentException">Is raised when any of the arguments has invalid value.</exception>
/// <remarks>Creates asynchronous(non-blocking) DNS transaction. Call <see cref="DNS_ClientTransaction.Start"/> to start transaction.
/// It is allowd to create multiple conccurent transactions.</remarks>
public DNS_ClientTransaction CreateTransaction(DNS_QType queryType, string queryText, int timeout)
{
if (queryType == DNS_QType.PTR)
{
IPAddress ip = null;
if (!IPAddress.TryParse(queryText, out ip))
{
throw new ArgumentException("Argument 'queryText' value must be IP address if queryType == DNS_QType.PTR.", "queryText");
}
}
if (queryText == null)
{
throw new ArgumentNullException("queryText");
}
if (queryText == string.Empty)
{
throw new ArgumentException("Argument 'queryText' value may not be \"\".", "queryText");
}
if (queryType == DNS_QType.PTR)
{
string ip = queryText;
// See if IP is ok.
IPAddress ipA = IPAddress.Parse(ip);
queryText = "";
// IPv6
if (ipA.AddressFamily == AddressFamily.InterNetworkV6)
{
// 4321:0:1:2:3:4:567:89ab
// would be
// b.a.9.8.7.6.5.0.4.0.0.0.3.0.0.0.2.0.0.0.1.0.0.0.0.0.0.0.1.2.3.4.IP6.ARPA
char[] ipChars = ip.Replace(":", "").ToCharArray();
for (int i = ipChars.Length - 1; i > -1; i--)
{
queryText += ipChars[i] + ".";
}
queryText += "IP6.ARPA";
}
// IPv4
else
{
// 213.35.221.186
// would be
// 186.221.35.213.in-addr.arpa
string[] ipParts = ip.Split('.');
//--- Reverse IP ----------
for (int i = 3; i > -1; i--)
{
queryText += ipParts[i] + ".";
}
queryText += "in-addr.arpa";
}
}
DNS_ClientTransaction retVal = new DNS_ClientTransaction(this, new Random().Next(0xFFFF), queryType, queryText, timeout);
retVal.StateChanged += delegate(object s1, EventArgs <DNS_ClientTransaction> e1)
{
if (retVal.State == DNS_ClientTransactionState.Completed)
{
m_pTransactions.Remove(e1.Value.ID);
}
};
m_pTransactions.Add(retVal.ID, retVal);
return(retVal);
}
