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Hi
I need to forward (a lot of) ports over SSH connections. Similar to usual
ssh -L a:b:c commands.
Now, I want to open the ssh connections only when they are used. I
implemented a java nio framework to accept incoming connections using a
single thread.
That part works.
As soon as I need the ssh connectons, I build them as required. This part
also works.
Then I need to connect that (locally already accepted) tcp connections over
the ssh connections. That part does not work. I try it this way:
System.out.println( "Connecting " + bindHost + ":" + bindPort + " ->
" + targetHost + ":" + targetPort );
socket.setTcpNoDelay( true );
Channel channel = session.openChannel( "direct-tcpip" );
( (ChannelDirectTCPIP) channel ).setInputStream(
socket.getInputStream() );
( (ChannelDirectTCPIP) channel ).setOutputStream(
socket.getOutputStream() );
( (ChannelDirectTCPIP) channel ).setHost( targetHost );
( (ChannelDirectTCPIP) channel ).setPort( targetPort );
( (ChannelDirectTCPIP) channel ).setOrgIPAddress(
socket.getInetAddress().getHostAddress() );
( (ChannelDirectTCPIP) channel ).setOrgPort( socket.getPort() );
try {
channel.connect();
} catch ( Throwable t ) {
t.printStackTrace();
}
However, connections just stall.
Can anyone give me a hint, what I am doing wrong?
Do I need to add a thread to forward information? (I thought direct-tcpip
would do that for me....
Any hints are welcome.
Best regards,
Steffen
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