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File: //lib/python3/dist-packages/twisted/conch/__pycache__/endpoints.cpython-38.pyc
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Endpoint implementations of various SSH interactions.
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    An L{_ISSHConnectionCreator} knows how to create SSH connections somehow.
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        Return a new, connected, secured, but not yet authenticated instance of
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        Perform cleanup necessary for a connection object previously returned
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            or L{twisted.conch.ssh.transport.SSHClientTransport} returned by a
            previous call to C{secureConnection}.  It is no longer needed by
            the caller of that method and may be closed or otherwise cleaned up
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    An L{SSHCommandAddress} instance represents the address of an SSH server, a
    username which was used to authenticate with that server, and a command
    which was run there.

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    @ivar username: See L{__init__}
    @ivar command: See L{__init__}
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        @param server: The address of the SSH server on which the command is
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        @param username: An authentication username which was used to
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        @type username: L{bytes}

        @param command: A command which was run in a session channel on the
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    A L{_CommandChannel} executes a command in a session channel and connects
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    @ivar _command: See L{__init__}
    @ivar _protocolFactory:  See L{__init__}
    @ivar _commandConnected:  See L{__init__}
    @ivar _protocol: An L{IProtocol} provider created using C{_protocolFactory}
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        @param creator: The L{_ISSHConnectionCreator} provider which was used
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        @param command: The command to be executed.
        @type command: L{bytes}

        @param protocolFactory: A client factory to use to build a L{IProtocol}
            provider to use to associate with the running command.

        @param commandConnected: A L{Deferred} to use to signal that execution
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        When the server sends the command's exit status, record it for later
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        When the SSH I{connection} I{service} this object represents is ready
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    L{_UserAuth} implements the client part of SSH user authentication in the
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        Retrieve the next public key object to offer to the server, possibly
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    @ivar _userauth: The L{_UserAuth} instance which is in charge of the
        overall authentication process or L{None} if the SSH connection has not
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        @param creator: The L{_NewConnectionHelper} that created this
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    L{SSHCommandClientEndpoint} exposes the command-executing functionality of
    SSH servers.

    L{SSHCommandClientEndpoint} can set up a new SSH connection, authenticate
    it in any one of a number of different ways (keys, passwords, agents),
    launch a command over that connection and then associate its input and
    output with a protocol.

    It can also re-use an existing, already-authenticated SSH connection
    (perhaps one which already has some SSH channels being used for other
    purposes).  In this case it creates a new SSH channel to use to execute the
    command.  Notably this means it supports multiplexing several different
    command invocations over a single SSH connection.
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        @param creator: An L{_ISSHConnectionCreator} provider which will be
            used to set up the SSH connection which will be used to run a
            command.
        @type creator: L{_ISSHConnectionCreator} provider

        @param command: The command line to execute on the SSH server.  This
            byte string is interpreted by a shell on the SSH server, so it may
            have a value like C{"ls /"}.  Take care when trying to run a
            command like C{"/Volumes/My Stuff/a-program"} - spaces (and other
            special bytes) may require escaping.
        @type command: L{bytes}

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        close the connection if there are problems leading up to the command
        being executed, after the command finishes, or if the connection
        L{Deferred} is cancelled.

        @param reactor: The reactor to use to establish the connection.
        @type reactor: L{IReactorTCP} provider

        @param command: See L{__init__}'s C{command} argument.

        @param username: The username with which to authenticate to the SSH
            server.
        @type username: L{bytes}

        @param hostname: The hostname of the SSH server.
        @type hostname: L{bytes}

        @param port: The port number of the SSH server.  By default, the
            standard SSH port number is used.
        @type port: L{int}

        @param keys: Private keys with which to authenticate to the SSH server,
            if key authentication is to be attempted (otherwise L{None}).
        @type keys: L{list} of L{Key}

        @param password: The password with which to authenticate to the SSH
            server, if password authentication is to be attempted (otherwise
            L{None}).
        @type password: L{bytes} or L{None}

        @param agentEndpoint: An L{IStreamClientEndpoint} provider which may be
            used to connect to an SSH agent, if one is to be used to help with
            authentication.
        @type agentEndpoint: L{IStreamClientEndpoint} provider

        @param knownHosts: The currently known host keys, used to check the
            host key presented by the server we actually connect to.
        @type knownHosts: L{KnownHostsFile}

        @param ui: An object for interacting with users to make decisions about
            whether to accept the server host keys.  If L{None}, a L{ConsoleUI}
            connected to /dev/tty will be used; if /dev/tty is unavailable, an
            object which answers C{b"no"} to all prompts will be used.
        @type ui: L{None} or L{ConsoleUI}

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        or after the command finishes.

        @param connection: An existing connection to an SSH server.
        @type connection: L{SSHConnection}

        @param command: See L{SSHCommandClientEndpoint.newConnection}'s
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            which will be connected to the stdin and stdout of the command on
            the SSH server.

        @return: A L{Deferred} which will fire with an error if the connection
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        @param protocolFactory: See L{SSHCommandClientEndpoint.connect}'s
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    L{_NewConnectionHelper} implements L{_ISSHConnectionCreator} by
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        @param tty: The path of the tty device to use in case C{ui} is L{None}.
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