close()
{
if (socket != null)
{
if (trace.enabled(2))
{
trace.write(title + ": closing network connection");
}
try { socket.Close(); }
catch (Exception /* ignore */) { }
finally
{
socket = null;
ipAddress = null;
}
}
return;
} // close
/*
** Name: close
**
** Description:
** Close socket used for network connection.
**
** Input:
** None.
**
** Output:
** None.
**
** Returns:
** void
**
** History:
** 3-May-05 (gordy)
** Created.
*/
private void close()
{
if (socket != null)
{
if (trace.enabled(2))
trace.write(title + ": closing network connection");
try { socket.Close(); }
catch (Exception /* ignore */) { }
finally
{
socket = null;
ipAddress = null;
}
}
return;
}
connect(String host, String portID)
{
int i;
System.Net.IPAddress[] ipAddresses;
System.Net.IPEndPoint ipEndPoint = null;
socket = null;
ipAddresses = null;
ipAddress = null;
socketIsLocal = false;
try
{
if (trace.enabled(2))
{
trace.write(title + ": opening network connection '" +
host + "', '" + portID + "'");
}
if (host == null ||
host.Length == 0 || // if local machine
host.ToLowerInvariant() == "(local)")
{
ipAddresses = System.Net.Dns.GetHostAddresses(System.Net.Dns.GetHostName());
socketIsLocal = true;
}
else
{
ipAddresses = System.Net.Dns.GetHostAddresses(host);
}
int port = translatePortID(portID);
for (i = 0; i < ipAddresses.Length; i++) // loop addresses
{
ipAddress = ipAddresses[i];
if (trace.enabled(3))
{
string address = ipAddress.ToString() + " ";
address += ipAddress.AddressFamily.ToString();
if (ipAddress.AddressFamily ==
System.Net.Sockets.AddressFamily.InterNetwork)
{
address += "(IPv4)";
}
else if (ipAddress.AddressFamily ==
System.Net.Sockets.AddressFamily.InterNetworkV6)
{
address += "(IPv6),";
address += "ScopeId=" + ipAddress.ScopeId.ToString();
}
trace.write(title + ": host address " + address +
"; port=" + port);
}
ipEndPoint = new System.Net.IPEndPoint(ipAddress, port);
socket = new MsgSocket(ipAddress.AddressFamily);
try
{
socket.Connect(ipEndPoint);
if (trace.enabled(3))
{
trace.write(title + ": connected to host address and port");
}
return; // success!
}
catch (Exception ex)
{
if (trace.enabled(1))
{
trace.write(title + ": connection failed to address[" + i + "]=" + ipAddress + " - " + ex.Message);
}
if (i == (ipAddresses.Length - 1))
{
throw; // continue throw of last exception up chain
}
// else try next address on list.
}
} // end for loop through ipHostInfo.AddressList
if (i == ipAddresses.Length)
{ // should not have reached this point but we will bullet-proof
trace.write(title + ": connection error - all addresses failed");
throw SqlEx.get(ERR_GC4001_CONNECT_ERR);
}
} // end try block
catch (System.Net.Sockets.SocketException ex)
{
if (trace.enabled(1))
{
trace.write(title +
": error connecting to host - (SocketException) " +
ex.Message);
}
SqlEx pex = (SqlEx)
SqlEx.get(ERR_GC4001_CONNECT_ERR, ex);
// "Unable to establish connection due to communications error."
if (ipAddresses == null) // is it the GetHostAddresses( )
{
pex = SqlEx.get(pex, SqlEx.get(
"SocketException thrown " +
"by System.Net.Dns.GetHostAddresses(" +
(host == null?"<null>":("\"" + host + "\"")) + ") " +
"in resolving the hostname",
"08001", ex.ErrorCode));
}
else // must be TcpClient( ) call
{
pex = SqlEx.get(pex, SqlEx.get(
"SocketException thrown " +
"by System.Net.Sockets.TcpClient( ) " +
"while connecting to host " +
(host == null ? "<null>" : ("\"" + host + "\".")),
"08001", ex.ErrorCode));
}
socket = null;
ipAddress = null;
throw pex;
}
catch (System.Exception ex)
{
if (trace.enabled(1))
{
trace.write(title + ": error connecting to host - " + ex.Message);
}
socket = null;
ipAddress = null;
throw SqlEx.get(ERR_GC4001_CONNECT_ERR, ex);
}
} // connect
/*
** Name: connect
**
** Description:
** Opens a socket connection to target host.
**
** Input:
** host Host name or address.
** portID Symbolic or numeric port ID.
**
** Output:
** None.
**
** Returns:
** void.
**
** History:
** 7-Jun-99 (gordy)
** Created.
** 17-nov-04 (thoda04)
** Be forgiving and treat "(local)" as localhost.
** 04-may-06 (thoda04)
** Replace the obsolete .NET 1.1 GetHostByName() method with
** new .NET 2.0 System.Net.Dns.GetHostEntry() method.
** 3-Nov-08 (gordy, ported by thoda04)
** Extracted from constructor.
** 04-feb-10 (thoda04) B123229
** Data provider connects slowly if using IPv6 addresses.
** Use TcpClient(AddressFamily) constructor to avoid
** SocketException if an IPv6 address is passed.
** Replace System.Net.Dns.GetHostEntry() method with
** GetHostAddresses() to avoid with DNS reverse lookup.
*/
protected internal virtual void connect( String host, String portID )
{
int i;
System.Net.IPAddress[] ipAddresses;
System.Net.IPEndPoint ipEndPoint = null;
socket = null;
ipAddresses = null;
ipAddress = null;
socketIsLocal = false;
try
{
if (trace.enabled(2))
trace.write(title + ": opening network connection '" +
host + "', '" + portID + "'");
if (host == null ||
host.Length==0 || // if local machine
host.ToLowerInvariant() == "(local)")
{
ipAddresses = System.Net.Dns.GetHostAddresses(System.Net.Dns.GetHostName());
socketIsLocal = true;
}
else
ipAddresses = System.Net.Dns.GetHostAddresses(host);
int port = translatePortID(portID);
for (i = 0; i < ipAddresses.Length; i++) // loop addresses
{
ipAddress = ipAddresses[i];
if (trace.enabled(3))
{
string address = ipAddress.ToString() + " ";
address += ipAddress.AddressFamily.ToString();
if (ipAddress.AddressFamily ==
System.Net.Sockets.AddressFamily.InterNetwork)
address += "(IPv4)";
else if (ipAddress.AddressFamily ==
System.Net.Sockets.AddressFamily.InterNetworkV6)
{
address += "(IPv6),";
address += "ScopeId=" + ipAddress.ScopeId.ToString();
}
trace.write(title + ": host address " + address +
"; port=" + port);
}
ipEndPoint = new System.Net.IPEndPoint(ipAddress, port);
socket = new MsgSocket(ipAddress.AddressFamily);
try
{
socket.Connect(ipEndPoint);
if (trace.enabled(3))
trace.write(title + ": connected to host address and port");
return; // success!
}
catch (Exception ex)
{
if (trace.enabled(1))
trace.write(title + ": connection failed to address[" + i + "]=" + ipAddress + " - " + ex.Message);
if (i == (ipAddresses.Length - 1))
throw; // continue throw of last exception up chain
// else try next address on list.
}
} // end for loop through ipHostInfo.AddressList
if (i == ipAddresses.Length)
{ // should not have reached this point but we will bullet-proof
trace.write(title + ": connection error - all addresses failed");
throw SqlEx.get(ERR_GC4001_CONNECT_ERR);
}
} // end try block
catch (System.Net.Sockets.SocketException ex)
{
if (trace.enabled(1))
trace.write(title +
": error connecting to host - (SocketException) " +
ex.Message);
SqlEx pex = (SqlEx)
SqlEx.get( ERR_GC4001_CONNECT_ERR, ex );
// "Unable to establish connection due to communications error."
if (ipAddresses == null) // is it the GetHostAddresses( )
pex = SqlEx.get(pex, SqlEx.get(
"SocketException thrown " +
"by System.Net.Dns.GetHostAddresses(" +
(host==null?"<null>":("\""+host+"\"")) + ") " +
"in resolving the hostname",
"08001",ex.ErrorCode));
else // must be TcpClient( ) call
pex = SqlEx.get(pex, SqlEx.get(
"SocketException thrown " +
"by System.Net.Sockets.TcpClient( ) " +
"while connecting to host " +
(host == null ? "<null>" : ("\"" + host + "\".")),
"08001",ex.ErrorCode));
socket = null;
ipAddress = null;
throw pex;
}
catch (System.Exception ex)
{
if (trace.enabled(1))
trace.write(title + ": error connecting to host - " + ex.Message);
socket = null;
ipAddress = null;
throw SqlEx.get( ERR_GC4001_CONNECT_ERR, ex );
}
}