// Resources must be established per-connection.
/// <exception cref="NGit.Errors.TransportException"></exception>
internal virtual Socket OpenConnection()
{
int tms = GetTimeout() > 0 ? GetTimeout() * 1000 : 0;
int port = uri.GetPort() > 0 ? uri.GetPort() : GIT_PORT;
Socket s = Sharpen.Extensions.CreateSocket();
try
{
IPAddress host = Sharpen.Extensions.GetAddressByName(uri.GetHost());
s.Bind2(null);
s.Connect(new IPEndPoint(host, port), tms);
}
catch (IOException c)
{
try
{
s.Close();
}
catch (IOException)
{
}
// ignore a failure during close, we're already failing
if (c is UnknownHostException)
{
throw new TransportException(uri, JGitText.Get().unknownHost);
}
if (c is ConnectException)
{
throw new TransportException(uri, c.Message);
}
throw new TransportException(uri, c.Message, c);
}
return(s);
}
public virtual void TestAvoidLoopbackTcpSockets()
{
Configuration conf = new Configuration();
Socket socket = NetUtils.GetDefaultSocketFactory(conf).CreateSocket();
socket.Bind2(new IPEndPoint("127.0.0.1", 0));
System.Console.Error.WriteLine("local address: " + socket.GetLocalAddress());
System.Console.Error.WriteLine("local port: " + socket.GetLocalPort());
try
{
NetUtils.Connect(socket, new IPEndPoint(socket.GetLocalAddress(), socket.GetLocalPort
()), 20000);
socket.Close();
NUnit.Framework.Assert.Fail("Should not have connected");
}
catch (ConnectException ce)
{
System.Console.Error.WriteLine("Got exception: " + ce);
Assert.True(ce.Message.Contains("resulted in a loopback"));
}
catch (SocketException se)
{
// Some TCP stacks will actually throw their own Invalid argument exception
// here. This is also OK.
Assert.True(se.Message.Contains("Invalid argument"));
}
}
/// <exception cref="System.IO.IOException"/>
/// <exception cref="UnknownHostException"/>
public override Socket CreateSocket(string host, int port, IPAddress localHostAddr
, int localPort)
{
Socket socket = CreateSocket();
socket.Bind2(new IPEndPoint(localHostAddr, localPort));
socket.Connect(new IPEndPoint(host, port));
return(socket);
}
/// <summary>
/// Like
/// <see cref="Connect(System.Net.Sockets.Socket, System.Net.EndPoint, int)"/>
/// but
/// also takes a local address and port to bind the socket to.
/// </summary>
/// <param name="socket"/>
/// <param name="endpoint">the remote address</param>
/// <param name="localAddr">the local address to bind the socket to</param>
/// <param name="timeout">timeout in milliseconds</param>
/// <exception cref="System.IO.IOException"/>
public static void Connect(Socket socket, EndPoint endpoint, EndPoint localAddr,
int timeout)
{
if (socket == null || endpoint == null || timeout < 0)
{
throw new ArgumentException("Illegal argument for connect()");
}
SocketChannel ch = socket.GetChannel();
if (localAddr != null)
{
Type localClass = localAddr.GetType();
Type remoteClass = endpoint.GetType();
Preconditions.CheckArgument(localClass.Equals(remoteClass), "Local address %s must be of same family as remote address %s."
, localAddr, endpoint);
socket.Bind2(localAddr);
}
try
{
if (ch == null)
{
// let the default implementation handle it.
socket.Connect(endpoint, timeout);
}
else
{
SocketIOWithTimeout.Connect(ch, endpoint, timeout);
}
}
catch (SocketTimeoutException ste)
{
throw new ConnectTimeoutException(ste.Message);
}
// There is a very rare case allowed by the TCP specification, such that
// if we are trying to connect to an endpoint on the local machine,
// and we end up choosing an ephemeral port equal to the destination port,
// we will actually end up getting connected to ourself (ie any data we
// send just comes right back). This is only possible if the target
// daemon is down, so we'll treat it like connection refused.
if (socket.GetLocalPort() == socket.GetPort() && socket.GetLocalAddress().Equals(
socket.GetInetAddress()))
{
Log.Info("Detected a loopback TCP socket, disconnecting it");
socket.Close();
throw new ConnectException("Localhost targeted connection resulted in a loopback. "
+ "No daemon is listening on the target port.");
}
}
