public virtual ProxySocket GetPreparedSocket(IPAddress address, int port)
{
//Creates the Socket for sending data over TCP.
ProxySocket proxySocket = new ProxySocket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// incorporate the connection settings like proxy's
// Note: ProxyType is in MSNPSharp namespace, ProxyTypes in ProxySocket namespace.
if (ConnectivitySettings.ProxyType == ProxyType.None)
{
proxySocket.ProxyType = ProxyTypes.None;
}
else
{
// set the proxy type
switch (ConnectivitySettings.ProxyType)
{
case ProxyType.Socks4:
proxySocket.ProxyType = ProxyTypes.Socks4;
break;
case ProxyType.Socks5:
proxySocket.ProxyType = ProxyTypes.Socks5;
break;
case ProxyType.Http:
proxySocket.ProxyType = ProxyTypes.Http;
break;
}
proxySocket.ProxyUser = ConnectivitySettings.ProxyUsername;
proxySocket.ProxyPass = ConnectivitySettings.ProxyPassword;
// resolve the proxy host
if (proxyEndPoint == null)
{
bool worked = false;
int retries = 0;
Exception exp = null;
//we retry a few times, because dns resolve failure is quite common
do
{
try
{
System.Net.IPAddress ipAddress = Network.DnsResolve(ConnectivitySettings.ProxyHost);
// assign to the connection object so other sockets can make use of it quickly
proxyEndPoint = new IPEndPoint(ipAddress, ConnectivitySettings.ProxyPort);
worked = true;
}
catch (Exception e)
{
retries++;
exp = e;
}
} while (!worked && retries < 3);
if (!worked)
throw new ConnectivityException("DNS Resolve for the proxy server failed: " + ConnectivitySettings.ProxyHost + " failed.", exp);
}
proxySocket.ProxyEndPoint = proxyEndPoint;
}
//Send operations will timeout of confirmation is not received within 3000 milliseconds.
proxySocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 3000);
//Socket will linger for 2 seconds after close is called.
LingerOption lingerOption = new LingerOption(true, 2);
proxySocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Linger, lingerOption);
try
{
proxySocket.Bind(new IPEndPoint(address, port));
}
catch (SocketException ex)
{
Trace.WriteLineIf(Settings.TraceSwitch.TraceError, "An error occured while trying to bind to a local address, error code: " + ex.ErrorCode + ".");
}
return proxySocket;
}
