[Twisted-Python] how to get extReceived call from SSHCommandClientEndpoint

[Sean DiZazzo]

It looks like extReceived() is a method of SSHSession.Channel.SSHChannel
<https://twistedmatrix.com/documents/8.1.0/api/twisted.conch.ssh.session.SSHSession.html#extReceived>.
You can access it through the protocol's transport.

self.transport.conn.channels[0].extReceived()

~Sean

On Fri, Apr 5, 2019 at 6:27 AM Sereysethy TOUCH <touch.sereysethy at gmail.com>
wrote:

> Hello,
>
> I am implementing a program using SSHCommandClientEndpoint, the program
> works fine (dataReceived got calls) but when the server send an error
> message (stderr..), the function extReceived in my protocol never gets
> called, instead it only calls the one in the SSHChannel as I can see in the
> log (got extended data 1 b': No such file or directory\n'). How to override
> that? Or how to connect it to my protocol?
>
> I adapted the program found on Twisted website.
>
> Thanks,
> Sethy
>
> from twisted.conch.endpoints import SSHCommandClientEndpoint
> from twisted.internet.protocol import Factory, Protocol
> from twisted.python import log
> import sys
> from twisted.internet.defer import Deferred
>
> class NoiseProtocol(Protocol):
>     def connectionMade(self):
>         print("connectionMade")
>         self.finished = Deferred()
>         self.strings = ["bif", "pow", "zot"]
>         self.sendNoise()
>
>     def sendNoise(self):
>         if self.strings:
>             self.transport.write(self.strings.pop(0) + "\n")
>         else:
>             self.transport.loseConnection()
>
>
>     def dataReceived(self, data):
>         print("Server says:", data)
>         self.sendNoise()
>
>     def extReceived(self, dataType, data):
>         print("extReceived")
>
>     def connectionLost(self, reason):
>         self.finished.callback(None)
>
> command = b"cat unknownfile"
>
> username = b"XXXX"
> password = b"XXXX"
> host = b"server"
> port = 22
>
> endpoint = SSHCommandClientEndpoint.newConnection(
>     reactor, command, username, host, port,
>     password=password, agentEndpoint=None)
>
> factory = Factory()
> factory.protocol = NoiseProtocol
>
> d = endpoint.connect(factory)
> d.addCallback(lambda proto: proto.finished)
> log.startLogging(sys.stdout, setStdout=0)
> reactor.run()
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