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Updated readme, updated setup. Added exceptions cython file and agent…
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ssh2-python | ||
============ | ||
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Super fast SSH2 protocol library. ``ssh2-python`` provides Python bindings for `libssh2`_. | ||
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.. image:: https://img.shields.io/badge/License-LGPL%20v2-blue.svg | ||
:target: https://pypi.python.org/pypi/ssh2-python | ||
:alt: License | ||
.. image:: https://img.shields.io/pypi/v/ssh2-python.svg | ||
:target: https://pypi.python.org/pypi/ssh2-python | ||
:alt: Latest Version | ||
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Features | ||
--------- | ||
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Majority of the `libssh2`_ API has been implemented as Python native code extensions. ``ssh2-python`` is a thin wrapper of ``libssh2`` - ``libssh2`` code examples can be ported straight over to Python with only minimal changes. | ||
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*Library is usable for testing purposes and at the moment available as source code only. API, module names and documentation not yet finalised. Contributions welcome.* | ||
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SSH Functionality provided | ||
++++++++++++++++++++++++++++ | ||
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* SSH channel operations (exec,shell,subsystem) | ||
* SSH agent | ||
* Public key authentication and management | ||
* SFTP | ||
* SCP | ||
* SSH port forwarding and tunnelling | ||
* Non-blocking mode | ||
* Listener for port forwarding | ||
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And more, as per `libssh2`_ functionality. | ||
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Native Code Extension Features | ||
+++++++++++++++++++++++++++++++ | ||
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The library uses `Cython`_ based native code extensions as wrappers to ``libssh2``. | ||
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Extension features: | ||
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* Thread safe - GIL is released as much as possible | ||
* Very low overhead | ||
* Super fast as a consequence of the excellent C library it uses and that it uses native code prodigiously | ||
* Object oriented - memory freed automatically and safely as objects expire | ||
* Use Python semantics where applicable, such as iterator support for SFTP file handles | ||
* Expose errors as Python exceptions where possible | ||
* Provide access to ``libssh2`` error code definitions | ||
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Example | ||
-------- | ||
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A simple usage example looks very similar to ``libssh2`` `usage examples <https://www.libssh2.org/examples/>`_. | ||
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As mentioned, ``ssh2-python`` is intentially a thin wrapper over ``libssh2`` and directly maps most of its API. | ||
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Clients using this library can be much simpler to use than interfacing with the ``libssh2`` API directly. | ||
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.. code-block:: python | ||
from __future__ import print_function | ||
import os | ||
import socket | ||
from ssh2 import Session | ||
host = 'localhost' | ||
user = os.getlogin() | ||
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | ||
sock.connect((host, 22)) | ||
session = Session() | ||
session.handshake(sock) | ||
session.agent_auth(user) | ||
channel = session.open_session() | ||
channel.execute('echo me; exit 2') | ||
size, data = channel.read() | ||
while size > 0: | ||
print(data) | ||
size, data = channel.read() | ||
channel.close() | ||
print("Exit status: %s" % channel.get_exit_status()) | ||
:Output: | ||
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me | ||
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Exit status: 2 | ||
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Comparison with other Python SSH2 libraries | ||
--------------------------------------------- | ||
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Performance of above example, compared with Paramiko. | ||
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.. code-block:: shell | ||
time python examples/example_echo.py | ||
time python examples/paramiko_comparison.py | ||
:Output: | ||
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``ssh2-python``:: | ||
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real 0m0.141s | ||
user 0m0.037s | ||
sys 0m0.008s | ||
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``paramiko``:: | ||
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real 0m0.592s | ||
user 0m0.351s | ||
sys 0m0.021s | ||
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See `examples directory < link >`_ for more complete example scripts. | ||
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.. _libssh2: https://www.libssh2.org | ||
.. _Cython: https://www.cython.org |
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from __future__ import print_function | ||
import os | ||
import socket | ||
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from ssh2 import Session | ||
from ssh2.utils import version | ||
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# Connection settings | ||
host = 'localhost' | ||
user = os.getlogin() | ||
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# Make socket, connect | ||
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | ||
sock.connect((host, 22)) | ||
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# Initialise | ||
session = Session() | ||
session.handshake(sock) | ||
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# List available authentication methods | ||
print(session.userauth_list(user)) | ||
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# Convenience function for agent based authentication | ||
session.agent_auth(user) | ||
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# Agent capabilities | ||
# agent = session.agent_init() | ||
# agent.connect() | ||
# identities = agent.get_identities(user) | ||
# print(identities) | ||
# print(identities[0].magic) | ||
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# Public key blob available as identities[0].blob | ||
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# Channel initialise, exec and wait for end | ||
channel = session.open_session() | ||
channel.execute('echo me') | ||
channel.wait_eof() | ||
channel.close() | ||
channel.wait_closed() | ||
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# Get exit status | ||
print("Exit status: %s" % channel.get_exit_status()) | ||
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# Print output | ||
size, data = channel.read() | ||
while size > 0: | ||
print(data) | ||
size, data = channel.read() | ||
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# SFTP capabilities, uncomment and enter a filename | ||
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# sftp = session.sftp_init() | ||
# fh = sftp.open('<my file>', 0, 0) | ||
# for data in fh: | ||
# pass | ||
# del session |
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from __future__ import print_function | ||
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import paramiko | ||
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client = paramiko.SSHClient() | ||
client.set_missing_host_key_policy( | ||
paramiko.MissingHostKeyPolicy()) | ||
client.connect('localhost') | ||
transport = client.get_transport() | ||
channel = transport.open_session() | ||
stdout = channel.makefile('rb') | ||
channel.exec_command('echo me') | ||
for line in stdout: | ||
print(line) | ||
channel.close() | ||
print("Exit status: %s" % channel.recv_exit_status()) |
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