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//
// System.Data.ProviderBase.PDbPortResolver
//
// Authors:
// Konstantin Triger <kostat@mainsoft.com>
// Boris Kirzner <borisk@mainsoft.com>
//
// (C) 2005 Mainsoft Corporation (http://www.mainsoft.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using java.net;
namespace System.Data.ProviderBase
{
internal sealed class DbPortResolver
{
public static int getMSSqlPort(AbstractDBConnection connection)
{
String instanceName = connection.InstanceName;
int timeout = connection.ConnectionTimeout;
int port = -1;
try
{
DatagramSocket socket = new DatagramSocket();
// send request
sbyte[] buf = new sbyte[] {2};
InetAddress address = InetAddress.getByName(connection.DataSource);
DatagramPacket packet = new DatagramPacket(buf, buf.Length, address, 1434);
socket.send(packet);
sbyte[] recbuf = new sbyte[1024];
packet = new DatagramPacket(recbuf, recbuf.Length, packet.getAddress(), packet.getPort());
// try to receive from socket while increasing timeouts in geometric progression
int iterationTimeout = 1;
int totalTimeout = 0;
for(;;) {
socket.setSoTimeout(iterationTimeout);
try
{
socket.receive(packet);
break;
}
catch (SocketTimeoutException e)
{
totalTimeout += iterationTimeout;
iterationTimeout *= 2;
if (totalTimeout >= timeout*1000) {
throw new java.sql.SQLException(
String.Format ("Unable to retrieve the port number for {0} using UDP on port 1434. Please see your network administrator to solve this problem or add the port number of your SQL server instance to your connection string (i.e. port=1433).", connection.DataSource)
);
}
}
}
sbyte[] rcvdSbytes = packet.getData();
char[] rcvdChars = new char[rcvdSbytes.Length];
for(int i=0; i < rcvdSbytes.Length; i++)
{
rcvdChars[i] = (char)rcvdSbytes[i];
}
String received = new String(rcvdChars);
java.util.StringTokenizer st = new java.util.StringTokenizer(received, ";");
String prev = "";
bool instanceReached = instanceName == null || instanceName.Length == 0;
while (st.hasMoreTokens())
{
if (!instanceReached)
{
if (prev.Trim().Equals("InstanceName"))
{
if (String.Compare(instanceName,st.nextToken().Trim(),true) == 0)
{
instanceReached = true;
}
}
}
else
{
if (prev.Trim().Equals("tcp"))
{
port = java.lang.Integer.parseInt(st.nextToken().Trim());
break;
}
}
prev = st.nextToken();
}
socket.close();
if (!instanceReached)
throw new java.sql.SQLException(
String.Format ("Specified SQL Server '{0}\\{1}' not found.", connection.DataSource, instanceName)
);
return port;
}
catch (java.sql.SQLException) {
throw;
}
catch (Exception e) {
throw new java.sql.SQLException(e.Message);
}
}
}
}
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