# Path: paramiko/ssh_exception.py
# class ProxyCommandFailure(SSHException):
#     """
#     The "ProxyCommand" found in the .ssh/config file returned an error.
# 
#     :param str command: The command line that is generating this exception.
#     :param str error: The error captured from the proxy command output.
#     """
# 
#     def __init__(self, command, error):
#         SSHException.__init__(self, command, error)
#         self.command = command
#         self.error = error
# 
#     def __str__(self):
#         return 'ProxyCommand("{}") returned nonzero exit status: {}'.format(
#             self.command, self.error
#         )
# 
# Path: paramiko/util.py
# class ClosingContextManager(object):
#     def __enter__(self):
#         return self
# 
#     def __exit__(self, type, value, traceback):
#         self.close()


import os
import shlex
import signal
import socket
import time
    import subprocess
from select import select
from paramiko.ssh_exception import ProxyCommandFailure
from paramiko.util import ClosingContextManager

        :param str command_line:
            the command that should be executed and used as the proxy.
        """
        if subprocess is None:
            raise subprocess_import_error
        self.cmd = shlex.split(command_line)
        self.process = subprocess.Popen(
            self.cmd,
            stdin=subprocess.PIPE,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            bufsize=0,
        )
        self.timeout = None

    def send(self, content):
        """
        Write the content received from the SSH client to the standard
        input of the forked command.

        :param str content: string to be sent to the forked command
        """
        try:
            self.process.stdin.write(content)
        except IOError as e:
            # There was a problem with the child process. It probably
            # died and we can't proceed. The best option here is to
            # raise an exception informing the user that the informed
            # ProxyCommand is not working.

# Path: paramiko/ssh_exception.py
# class ProxyCommandFailure(SSHException):
#     """
#     The "ProxyCommand" found in the .ssh/config file returned an error.
# 
#     :param str command: The command line that is generating this exception.
#     :param str error: The error captured from the proxy command output.
#     """
# 
#     def __init__(self, command, error):
#         SSHException.__init__(self, command, error)
#         self.command = command
#         self.error = error
# 
#     def __str__(self):
#         return 'ProxyCommand("{}") returned nonzero exit status: {}'.format(
#             self.command, self.error
#         )
# 
# Path: paramiko/util.py
# class ClosingContextManager(object):
#     def __enter__(self):
#         return self
# 
#     def __exit__(self, type, value, traceback):
#         self.close()


# Path: paramiko/proxy.py
import os
import shlex
import signal
import socket
import time
    import subprocess
from select import select
from paramiko.ssh_exception import ProxyCommandFailure
from paramiko.util import ClosingContextManager


        :param str command_line:
            the command that should be executed and used as the proxy.
        """
        if subprocess is None:
            raise subprocess_import_error
        self.cmd = shlex.split(command_line)
        self.process = subprocess.Popen(
            self.cmd,
            stdin=subprocess.PIPE,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            bufsize=0,
        )
        self.timeout = None

    def send(self, content):
        """
        Write the content received from the SSH client to the standard
        input of the forked command.

        :param str content: string to be sent to the forked command
        """
        try:
            self.process.stdin.write(content)
        except IOError as e:
            # There was a problem with the child process. It probably
            # died and we can't proceed. The best option here is to
            # raise an exception informing the user that the informed
            # ProxyCommand is not working.

            raise ProxyCommandFailure(" ".join(self.cmd), e.strerror)