Re: Tunneling

[Joao Pedro Almeida Pereira <joao.almeida@xxxxxxxxxxx>]

Hello,
Can anyone shed some light into my previous question? Sorry for insisting
but I am trying to understand if libssh can solve my problem or if i need
to implement something that will.....

Another question.
Imagine that i have this scenario:
           IPv4                     IPv6
HostA ===> MiddleHost ===> HostB

Can this be done as well?

BR


On 5 March 2014 11:40, Joao Pedro Almeida Pereira
<joao.almeida@xxxxxxxxxxx>wrote:

> Hello,
> Now that i had some time to review the sample of proxy, and install the
> new library, I am still not sure if i can do this the way i need.
> Let me restate my problem
> I need to connect into HostB's SSH Server but in order to do that i need
> to connect into MiddleHost SSH Server first
> HostA ===> MiddleHost ===> HostB
>
> So i need a Hop through SSH Server
>
> With proxy.c i would need to install an application in the MiddleHost in
> order to be able to just through but that is not what i want.
> Looking better to the pseudocode that i placed before in this thread i now
> realise that this would work for other type of data, like HTTP or
> something. But what i want is for libssh to handle the authentication of
> the HostB as well.
> So what i believe i need is something like:
>
> localSocket = create_local_listenning_socket( portLocal )
> middleHostCon = connect_to("MiddleHost")
> authenticate_user( middleHostCon, "username", "pass" )
> hostBCon = connect_to_using_connnection( "HostB", middleHostCon)
> authenticate_user( hostBCon , "username", "pass" )
> ( application ready to send data from local port into HostB )
> while(1)
>    if has_data(localSocket)
>       data = read_from_socket( localSocket )
>       write_to_connection( hostBCon, data)
>    if has_data(hostBCon)
>       data = read_from_connection( hostBCon)
>       write_to_socket( localSocket, data )
>    sleep(0.1)
> disconnect( hostBCon )
> disconnect( middleHostCon )
> disconnect( localSocket )
>
> Is there a way to accomplish this with libssh? Or do i need to create a
> proxy application to put in the MiddleHost?
>
> BR
>
>
> On 27 November 2013 20:36, Dustin Oprea <myselfasunder@xxxxxxxxx> wrote:
>
>>
>> On Wed, Nov 27, 2013 at 12:11 PM, Andreas Schneider <asn@xxxxxxxxxxxxxx>wrote:
>>
>>> On Wednesday 27 November 2013 15:59:07 Joao Pedro Almeida Pereira wrote:
>>> > Hello,
>>> > So basically i need to do
>>> > rc = channel_open_forward(forwarding_channel,
>>> > "HostB", 22,
>>> > "localhost", 5555);
>>> > sock = create_socket("localhost",5555)
>>> > con_sock = wait_for_client( sock )
>>> > while true:
>>> > if have_things_to_read( con_sock ):
>>> >
>>> > size_data = read_from_socket( con_sock, data_from_socket )
>>> >
>>> > channel_write(forwarding_channel, data_from_socket, size_data )
>>> >
>>> > else if have_things_to_read( forwarding_channel):
>>> >
>>> > size_data = channel_read( forwarding_channel, data_from_server)
>>> >
>>> > size_data = write_to_socket( con_sock, data_from_server )
>>> > else:
>>> > sleep(0.1)
>>> > Something similar to this with all the control logic in order to
>>> handle the
>>> > case of errors.
>>> >
>>>
>>> http://git.libssh.org/projects/libssh.git/tree/examples/proxy.c
>>>
>>> :)
>>>
>>> --
>>> Andreas Schneider                   GPG-ID: CC014E3D
>>> www.cryptomilk.org                asn@xxxxxxxxxxxxxx
>>>
>>>
>>>
>> There's also a very similar example online at
>> http://api.libssh.org/master/libssh_tutor_forwarding.html .
>>
>> It basically agrees with yours (except they just use a constant literal
>> as the source data).
>>
>>
>>
>> Dustin
>>
>>
>
>
> --
> --
> -----
> --------
> João Pereira
>
> Email: joao.almeida@xxxxxxxxxxx
> Web: http://www.bluetc.es
>



-- 
--
-----
--------
João Pereira

Email: joao.almeida@xxxxxxxxxxx
Web: http://www.bluetc.es