mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-26 14:50:36 +00:00
125 lines
4.3 KiB
Python
125 lines
4.3 KiB
Python
# Copyright (C) 2012 Yipit, Inc <coders@yipit.com>
|
|
#
|
|
# This file is part of paramiko.
|
|
#
|
|
# Paramiko is free software; you can redistribute it and/or modify it under the
|
|
# terms of the GNU Lesser General Public License as published by the Free
|
|
# Software Foundation; either version 2.1 of the License, or (at your option)
|
|
# any later version.
|
|
#
|
|
# Paramiko is distrubuted in the hope that it will be useful, but WITHOUT ANY
|
|
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
|
|
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
|
|
# details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public License
|
|
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
|
|
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
|
|
|
|
|
import os
|
|
from shlex import split as shlsplit
|
|
import signal
|
|
from select import select
|
|
import socket
|
|
import time
|
|
|
|
from paramiko.ssh_exception import ProxyCommandFailure
|
|
from paramiko.util import ClosingContextManager
|
|
|
|
|
|
class ProxyCommand(ClosingContextManager):
|
|
"""
|
|
Wraps a subprocess running ProxyCommand-driven programs.
|
|
|
|
This class implements a the socket-like interface needed by the
|
|
`.Transport` and `.Packetizer` classes. Using this class instead of a
|
|
regular socket makes it possible to talk with a Popen'd command that will
|
|
proxy traffic between the client and a server hosted in another machine.
|
|
|
|
Instances of this class may be used as context managers.
|
|
"""
|
|
|
|
def __init__(self, command_line):
|
|
"""
|
|
Create a new CommandProxy instance. The instance created by this
|
|
class can be passed as an argument to the `.Transport` class.
|
|
|
|
:param str command_line:
|
|
the command that should be executed and used as the proxy.
|
|
"""
|
|
# NOTE: subprocess import done lazily so platforms without it (e.g.
|
|
# GAE) can still import us during overall Paramiko load.
|
|
from subprocess import Popen, PIPE
|
|
|
|
self.cmd = shlsplit(command_line)
|
|
self.process = Popen(
|
|
self.cmd, stdin=PIPE, stdout=PIPE, stderr=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)
|
|
return len(content)
|
|
|
|
def recv(self, size):
|
|
"""
|
|
Read from the standard output of the forked program.
|
|
|
|
:param int size: how many chars should be read
|
|
|
|
:return: the string of bytes read, which may be shorter than requested
|
|
"""
|
|
try:
|
|
buffer = b""
|
|
start = time.time()
|
|
while len(buffer) < size:
|
|
select_timeout = None
|
|
if self.timeout is not None:
|
|
elapsed = time.time() - start
|
|
if elapsed >= self.timeout:
|
|
raise socket.timeout()
|
|
select_timeout = self.timeout - elapsed
|
|
|
|
r, w, x = select([self.process.stdout], [], [], select_timeout)
|
|
if r and r[0] == self.process.stdout:
|
|
buffer += os.read(
|
|
self.process.stdout.fileno(), size - len(buffer)
|
|
)
|
|
return buffer
|
|
except socket.timeout:
|
|
if buffer:
|
|
# Don't raise socket.timeout, return partial result instead
|
|
return buffer
|
|
raise # socket.timeout is a subclass of IOError
|
|
except IOError as e:
|
|
raise ProxyCommandFailure(" ".join(self.cmd), e.strerror)
|
|
|
|
def close(self):
|
|
os.kill(self.process.pid, signal.SIGTERM)
|
|
|
|
@property
|
|
def closed(self):
|
|
return self.process.returncode is not None
|
|
|
|
@property
|
|
def _closed(self):
|
|
# Concession to Python 3 socket-like API
|
|
return self.closed
|
|
|
|
def settimeout(self, timeout):
|
|
self.timeout = timeout
|