/// <summary>
/// Connect to the specified host
/// </summary>
/// <param name="host">The host to connect to</param>
/// <param name="port">The port to connect to</param>
/// <param name="ipVersions">Internet Protocol versions to support durring the connection phase</param>
public void Connect(string host, int port, FtpIpVersion ipVersions)
{
IAsyncResult ar = null;
IPAddress[] addresses = Dns.GetHostAddresses(host);
if (ipVersions == 0)
{
throw new ArgumentException("The ipVersions parameter must contain at least 1 flag.");
}
for (int i = 0; i < addresses.Length; i++)
{
#if DEBUG
FtpTrace.WriteLine("{0}: {1}", addresses[i].AddressFamily.ToString(), addresses[i].ToString());
#endif
// we don't need to do this check unless
// a particular version of IP has been
// omitted so we won't.
if (ipVersions != FtpIpVersion.ANY)
{
switch (addresses[i].AddressFamily)
{
case AddressFamily.InterNetwork:
if ((ipVersions & FtpIpVersion.IPv4) != FtpIpVersion.IPv4)
{
#if DEBUG
FtpTrace.WriteLine("SKIPPED!");
#endif
continue;
}
break;
case AddressFamily.InterNetworkV6:
if ((ipVersions & FtpIpVersion.IPv6) != FtpIpVersion.IPv6)
{
#if DEBUG
FtpTrace.WriteLine("SKIPPED!");
#endif
continue;
}
break;
}
}
m_socket = new Socket(addresses[i].AddressFamily, SocketType.Stream, ProtocolType.Tcp);
ar = m_socket.BeginConnect(addresses[i], port, null, null);
if (!ar.AsyncWaitHandle.WaitOne(m_connectTimeout, true))
{
Close();
// check to see if we're out of addresses
// and if we are throw a TimeoutException
if (i + 1 == addresses.Length)
{
throw new TimeoutException("Timed out trying to connect!");
}
}
else
{
m_socket.EndConnect(ar);
// we got a connection, break out
// of the loop.
break;
}
}
// make sure that we actually connected to
// one of the addresses returned from GetHostAddresses()
if (m_socket == null || !m_socket.Connected)
{
Close();
throw new IOException("Failed to connect to host.");
}
m_netStream = new NetworkStream(m_socket);
m_lastActivity = DateTime.Now;
}
public new void Dispose()
{
FtpTrace.WriteLine("Disposing FtpSocketStream...");
Close();
}