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=========
Changelog
=========

* :bug:`499` Strip trailing/leading whitespace from lines when parsing SSH
  config files - this brings things in line with OpenSSH behavior. Thanks to
  Alfredo Esteban for the original report and Nick Pillitteri for the patch.
* :bug:`652` Fix behavior of ``gssapi-with-mic`` auth requests so they fail
  gracefully (allowing followup via other auth methods) instead of raising an
  exception. Patch courtesy of ``@jamercee``.
* :support:`636` Clean up and enhance the README (and rename it to
  ``README.rst`` from just ``README``). Thanks to ``@LucasRMehl``.
* :release:`1.16.0 <2015-11-04>`
* :bug:`194 major` (also :issue:`562`, :issue:`530`, :issue:`576`) Streamline
  use of ``stat`` when downloading SFTP files via `SFTPClient.get
  <paramiko.sftp_client.SFTPClient.get>`; this avoids triggering bugs in some
  off-spec SFTP servers such as IBM Sterling. Thanks to ``@muraleee`` for the
  initial report and to Torkil Gustavsen for the patch.
* :feature:`467` (also :issue:`139`, :issue:`412`) Fully enable two-factor
  authentication (e.g. when a server requires ``AuthenticationMethods
  pubkey,keyboard-interactive``). Thanks to ``@perryjrandall`` for the patch
  and to ``@nevins-b`` and Matt Robenolt for additional support.
* :bug:`502 major` Fix 'exec' requests in server mode to use ``get_string``
  instead of ``get_text`` to avoid ``UnicodeDecodeError`` on non-UTF-8 input.
  Thanks to Anselm Kruis for the patch & discussion.
* :bug:`401` Fix line number reporting in log output regarding invalid
  ``known_hosts`` line entries. Thanks to Dylan Thacker-Smith for catch &
  patch.
* :support:`525 backported` Update the vendored Windows API addon to a more
  recent edition. Also fixes :issue:`193`, :issue:`488`, :issue:`498`. Thanks
  to Jason Coombs.
* :release:`1.15.4 <2015-11-02>`
* :release:`1.14.3 <2015-11-02>`
* :release:`1.13.4 <2015-11-02>`
* :bug:`366` Fix `~paramiko.sftp_attributes.SFTPAttributes` so its string
  representation doesn't raise exceptions on empty/initialized instances. Patch
  by Ulrich Petri.
* :bug:`359` Use correct attribute name when trying to use Python 3's
  ``int.bit_length`` method; prior to fix, the Python 2 custom fallback
  implementation was always used, even on Python 3. Thanks to Alex Gaynor.
* :support:`594 backported` Correct some post-Python3-port docstrings to
  specify ``bytes`` type instead of ``str``. Credit to ``@redixin``.
* :bug:`565` Don't explode with ``IndexError`` when reading private key files
  lacking an ``-----END <type> PRIVATE KEY-----`` footer. Patch courtesy of
  Prasanna Santhanam.
* :feature:`604` Add support for the ``aes192-ctr`` and ``aes192-cbc`` ciphers.
  Thanks to Michiel Tiller for noticing it was as easy as tweaking some key
  sizes :D
* :feature:`356` (also :issue:`596`, :issue:`365`, :issue:`341`, :issue:`164`,
  :issue:`581`, and a bunch of other duplicates besides) Add support for SHA-2
  based key exchange (kex) algorithm ``diffie-hellman-group-exchange-sha256``
  and (H)MAC algorithms ``hmac-sha2-256`` and ``hmac-sha2-512``.
  
  This change includes tweaks to debug-level logging regarding
  algorithm-selection handshakes; the old all-in-one log line is now multiple
  easier-to-read, printed-at-handshake-time log lines.

  Thanks to the many people who submitted patches for this functionality and/or
  assisted in testing those patches. That list includes but is not limited to,
  and in no particular order: Matthias Witte, Dag Wieers, Ash Berlin, Etienne
  Perot, Gert van Dijk, ``@GuyShaanan``, Aaron Bieber, ``@cyphase``, and Eric
  Brown.
* :release:`1.15.3 <2015-10-02>`
* :support:`554 backported` Fix inaccuracies in the docstring for the ECDSA key
  class. Thanks to Jared Hance for the patch.
* :support:`516 backported` Document `~paramiko.agent.AgentRequestHandler`.
  Thanks to ``@toejough`` for report & suggestions.
* :bug:`496` Fix a handful of small but critical bugs in Paramiko's GSSAPI
  support (note: this includes switching from PyCrypo's Random to
  `os.urandom`). Thanks to Anselm Kruis for catch & patch.
* :bug:`491` (combines :issue:`62` and :issue:`439`) Implement timeout
  functionality to address hangs from dropped network connections and/or failed
  handshakes. Credit to ``@vazir`` and ``@dacut`` for the original patches and
  to Olle Lundberg for reimplementation.
* :bug:`490` Skip invalid/unparseable lines in ``known_hosts`` files, instead
  of raising `~paramiko.ssh_exception.SSHException`. This brings Paramiko's
  behavior more in line with OpenSSH, which silently ignores such input. Catch
  & patch courtesy of Martin Topholm.
* :bug:`404` Print details when displaying
  `~paramiko.ssh_exception.BadHostKeyException` objects (expected vs received
  data) instead of just "hey shit broke". Patch credit: Loic Dachary.
* :bug:`469` (also :issue:`488`, :issue:`461` and like a dozen others) Fix a
  typo introduced in the 1.15 release which broke WinPageant support. Thanks to
  everyone who submitted patches, and to Steve Cohen who was the lucky winner
  of the cherry-pick lottery.
* :bug:`353` (via :issue:`482`) Fix a bug introduced in the Python 3 port
  which caused ``OverFlowError`` (and other symptoms) in SFTP functionality.
  Thanks to ``@dboreham`` for leading the troubleshooting charge, and to
  Scott Maxwell for the final patch.
* :support:`582` Fix some old ``setup.py`` related helper code which was
  breaking ``bdist_dumb`` on Mac OS X. Thanks to Peter Odding for the patch.
* :bug:`22 major` Try harder to connect to multiple network families (e.g. IPv4
  vs IPv6) in case of connection issues; this helps with problems such as hosts
  which resolve both IPv4 and IPv6 addresses but are only listening on IPv4.
  Thanks to Dries Desmet for original report and Torsten Landschoff for the
  foundational patchset.
* :bug:`402` Check to see if an SSH agent is actually present before trying to
  forward it to the remote end. This replaces what was usually a useless
  ``TypeError`` with a human-readable
  `~paramiko.ssh_exception.AuthenticationException`. Credit to Ken Jordan for
  the fix and Yvan Marques for original report.
* :release:`1.15.2 <2014-12-19>`
* :release:`1.14.2 <2014-12-19>`
* :release:`1.13.3 <2014-12-19>`
* :bug:`413` (also :issue:`414`, :issue:`420`, :issue:`454`) Be significantly
  smarter about polling & timing behavior when running proxy commands, to avoid
  unnecessary (often 100%!) CPU usage. Major thanks to Jason Dunsmore for
  report & initial patchset and to Chris Adams & John Morrissey for followup
  improvements.
* :bug:`455` Tweak packet size handling to conform better to the OpenSSH RFCs;
  this helps address issues with interactive program cursors. Courtesy of Jeff
  Quast.
* :bug:`428` Fix an issue in `~paramiko.file.BufferedFile` (primarily used in
  the SFTP modules) concerning incorrect behavior by
  `~paramiko.file.BufferedFile.readlines` on files whose size exceeds the
  buffer size. Thanks to ``@achapp`` for catch & patch.
* :bug:`415` Fix ``ssh_config`` parsing to correctly interpret ``ProxyCommand
  none`` as the lack of a proxy command, instead of as a literal command string
  of ``"none"``. Thanks to Richard Spiers for the catch & Sean Johnson for the
  fix.
* :support:`431 backported` Replace handrolled ``ssh_config`` parsing code with
  use of the ``shlex`` module. Thanks to Yan Kalchevskiy.
* :support:`422 backported` Clean up some unused imports. Courtesy of Olle
  Lundberg.
* :support:`421 backported` Modernize threading calls to use newer API. Thanks
  to Olle Lundberg.
* :support:`419 backported` Modernize a bunch of the codebase internals to
  leverage decorators. Props to ``@beckjake`` for realizing we're no longer on
  Python 2.2 :D
* :bug:`266` Change numbering of `~paramiko.transport.Transport` channels to
  start at 0 instead of 1 for better compatibility with OpenSSH & certain
  server implementations which break on 1-indexed channels. Thanks to
  ``@egroeper`` for catch & patch.
* :bug:`459` Tighten up agent connection closure behavior to avoid spurious
  ``ResourceWarning`` display in some situations. Thanks to ``@tkrapp`` for the
  catch.
* :bug:`429` Server-level debug message logging was overlooked during the
  Python 3 compatibility update; Python 3 clients attempting to log SSH debug
  packets encountered type errors. This is now fixed. Thanks to ``@mjmaenpaa``
  for the catch.
* :bug:`320` Update our win_pageant module to be Python 3 compatible. Thanks to
  ``@sherbang`` and ``@adamkerz`` for the patches.
* :release:`1.15.1 <2014-09-22>`
* :bug:`399` SSH agent forwarding (potentially other functionality as
  well) would hang due to incorrect values passed into the new window size
  arguments for `.Transport` (thanks to a botched merge). This has been
  corrected. Thanks to Dylan Thacker-Smith for the report & patch.
* :feature:`167` Add `.SSHConfig.get_hostnames` for easier introspection of a
  loaded SSH config file or object. Courtesy of Søren Løvborg.
* :release:`1.15.0 <2014-09-18>`
* :support:`393` Replace internal use of PyCrypto's ``SHA.new`` with the
  stdlib's ``hashlib.sha1``. Thanks to Alex Gaynor.
* :feature:`267` (also :issue:`250`, :issue:`241`, :issue:`228`) Add GSS-API /
  SSPI (e.g. Kerberos) key exchange and authentication support
  (:ref:`installation docs here <gssapi>`). Mega thanks to Sebastian Deiß, with
  assist by Torsten Landschoff.

    .. note::
        Unix users should be aware that the ``python-gssapi`` library (a
        requirement for using this functionality) only appears to support
        Python 2.7 and up at this time.

* :bug:`346 major` Fix an issue in private key files' encryption salts that
  could cause tracebacks and file corruption if keys were re-encrypted. Credit
  to Xavier Nunn.
* :feature:`362` Allow users to control the SSH banner timeout. Thanks to Cory
  Benfield.
* :feature:`372` Update default window & packet sizes to more closely adhere to
  the pertinent RFC; also expose these settings in the public API so they may
  be overridden by client code. This should address some general speed issues
  such as :issue:`175`. Big thanks to Olle Lundberg for the update.
* :bug:`373 major` Attempt to fix a handful of issues (such as :issue:`354`)
  related to infinite loops and threading deadlocks. Thanks to Olle Lundberg as
  well as a handful of community members who provided advice & feedback via
  IRC.
* :support:`374` (also :issue:`375`) Old code cleanup courtesy of Olle
  Lundberg.
* :support:`377` Factor `~paramiko.channel.Channel` openness sanity check into
  a decorator. Thanks to Olle Lundberg for original patch.
* :bug:`298 major` Don't perform point validation on ECDSA keys in
  ``known_hosts`` files, since a) this can cause significant slowdown when such
  keys exist, and b) ``known_hosts`` files are implicitly trustworthy. Thanks
  to Kieran Spear for catch & patch.

  .. note::
    This change bumps up the version requirement for the ``ecdsa`` library to
    ``0.11``.

* :bug:`234 major` Lower logging levels for a few overly-noisy log messages
  about secure channels. Thanks to David Pursehouse for noticing & contributing
  the fix.
* :feature:`218` Add support for ECDSA private keys on the client side. Thanks
  to ``@aszlig`` for the patch.
* :bug:`335 major` Fix ECDSA key generation (generation of brand new ECDSA keys
  was broken previously). Thanks to ``@solarw`` for catch & patch.
* :feature:`184` Support quoted values in SSH config file parsing. Credit to
  Yan Kalchevskiy.
* :feature:`131` Add a `~paramiko.sftp_client.SFTPClient.listdir_iter` method
  to `~paramiko.sftp_client.SFTPClient` allowing for more efficient,
  async/generator based file listings. Thanks to John Begeman.
* :support:`378 backported` Minor code cleanup in the SSH config module
  courtesy of Olle Lundberg.
* :support:`249 backported` Consolidate version information into one spot.
  Thanks to Gabi Davar for the reminder.
* :release:`1.14.1 <2014-08-25>`
* :release:`1.13.2 <2014-08-25>`
* :bug:`376` Be less aggressive about expanding variables in ``ssh_config``
  files, which results in a speedup of SSH config parsing. Credit to Olle
  Lundberg.
* :support:`324 backported` A bevvy of documentation typo fixes, courtesy of Roy
  Wellington.
* :bug:`312` `paramiko.transport.Transport` had a bug in its ``__repr__`` which
  surfaces during errors encountered within its ``__init__``, causing
  problematic tracebacks in such situations. Thanks to Simon Percivall for
  catch & patch.
* :bug:`272` Fix a bug where ``known_hosts`` parsing hashed the input hostname
  as well as the hostnames from the ``known_hosts`` file, on every comparison.
  Thanks to ``@sigmunau`` for final patch and ``@ostacey`` for the original
  report.
* :bug:`239` Add Windows-style CRLF support to SSH config file parsing. Props
  to Christopher Swenson.
* :support:`229 backported` Fix a couple of incorrectly-copied docstrings' ``..
  versionadded::`` RST directives. Thanks to Aarni Koskela for the catch.
* :support:`169 backported` Minor refactor of
  `paramiko.sftp_client.SFTPClient.put` thanks to Abhinav Upadhyay.
* :bug:`285` (also :issue:`352`) Update our Python 3 ``b()`` compatibility shim
  to handle ``buffer`` objects correctly; this fixes a frequently reported
  issue affecting many users, including users of the ``bzr`` software suite.
  Thanks to ``@basictheprogram`` for the initial report, Jelmer Vernooij for
  the fix and Andrew Starr-Bochicchio & Jeremy T. Bouse (among others) for
  discussion & feedback.
* :support:`371` Add Travis support & docs update for Python 3.4. Thanks to
  Olle Lundberg.
* :release:`1.14.0 <2014-05-07>`
* :release:`1.13.1 <2014-05-07>`
* :release:`1.12.4 <2014-05-07>`
* :release:`1.11.6 <2014-05-07>`
* :bug:`-` `paramiko.file.BufferedFile.read` incorrectly returned text strings
  after the Python 3 migration, despite bytes being more appropriate for file
  contents (which may be binary or of an unknown encoding.) This has been
  addressed.

  .. note::
      `paramiko.file.BufferedFile.readline` continues to return strings, not
      bytes, as "lines" only make sense for textual data. It assumes UTF-8 by
      default.

  This should fix `this issue raised on the Obnam mailing list
  <http://comments.gmane.org/gmane.comp.sysutils.backup.obnam/252>`_.  Thanks
  to Antoine Brenner for the patch.
* :bug:`-` Added self.args for exception classes. Used for unpickling. Related
  to (`Fabric #986 <https://github.com/fabric/fabric/issues/986>`_, `Fabric
  #714 <https://github.com/fabric/fabric/issues/714>`_). Thanks to Alex
  Plugaru.
* :bug:`-` Fix logging error in sftp_client for filenames containing the '%'
  character. Thanks to Antoine Brenner.
* :bug:`308` Fix regression in dsskey.py that caused sporadic signature 
  verification failures. Thanks to Chris Rose.
* :support:`299` Use deterministic signatures for ECDSA keys for improved
  security. Thanks to Alex Gaynor.
* :support:`297` Replace PyCrypto's ``Random`` with `os.urandom` for improved
  speed and security. Thanks again to Alex.
* :support:`295` Swap out a bunch of PyCrypto hash functions with use of
  `hashlib`. Thanks to Alex Gaynor.
* :support:`290` (also :issue:`292`) Add support for building universal
  (Python 2+3 compatible) wheel files during the release process. Courtesy of
  Alex Gaynor.
* :support:`284` Add Python language trove identifiers to ``setup.py``. Thanks
  to Alex Gaynor for catch & patch.
* :bug:`235` Improve string type testing in a handful of spots (e.g. ``s/if
  type(x) is str/if isinstance(x, basestring)/g``.) Thanks to ``@ksamuel`` for
  the report.
* :release:`1.13.0 <2014-03-13>`
* :release:`1.12.3 <2014-03-13>`
* :release:`1.11.5 <2014-03-13>`
* :release:`1.10.7 <2014-03-13>`
* :feature:`16` **Python 3 support!** Our test suite passes under Python 3, and
  it (& Fabric's test suite) continues to pass under Python 2. **Python 2.5 is
  no longer supported with this change!**
  
  The merged code was built on many contributors' efforts, both code &
  feedback. In no particular order, we thank Daniel Goertzen, Ivan Kolodyazhny,
  Tomi Pieviläinen, Jason R. Coombs, Jan N. Schulze, ``@Lazik``, Dorian Pula,
  Scott Maxwell, Tshepang Lekhonkhobe, Aaron Meurer, and Dave Halter.
* :support:`256 backported` Convert API documentation to Sphinx, yielding a new
  API docs website to replace the old Epydoc one. Thanks to Olle Lundberg for
  the initial conversion work.
* :bug:`-` Use constant-time hash comparison operations where possible, to
  protect against `timing-based attacks
  <http://codahale.com/a-lesson-in-timing-attacks/>`_. Thanks to Alex Gaynor
  for the patch.
* :release:`1.12.2 <2014-02-14>`
* :release:`1.11.4 <2014-02-14>`
* :release:`1.10.6 <2014-02-14>`
* :feature:`58` Allow client code to access the stored SSH server banner via
  `Transport.get_banner <paramiko.transport.Transport.get_banner>`. Thanks to
  ``@Jhoanor`` for the patch.
* :bug:`252` (`Fabric #1020 <https://github.com/fabric/fabric/issues/1020>`_)
  Enhanced the implementation of ``ProxyCommand`` to avoid a deadlock/hang
  condition that frequently occurs at ``Transport`` shutdown time. Thanks to
  Mateusz Kobos, Matthijs van der Vleuten and Guillaume Zitta for the original
  reports and to Marius Gedminas for helping test nontrivial use cases.
* :bug:`268` Fix some missed renames of ``ProxyCommand`` related error classes.
  Thanks to Marius Gedminas for catch & patch.
* :bug:`34` (PR :issue:`35`) Fix SFTP prefetching incompatibility with some
  SFTP servers regarding request/response ordering. Thanks to Richard
  Kettlewell.
* :bug:`193` (and its attentant PRs :issue:`230` & :issue:`253`) Fix SSH agent
  problems present on Windows. Thanks to David Hobbs for initial report and to
  Aarni Koskela & Olle Lundberg for the patches.
* :release:`1.12.1 <2014-01-08>`
* :release:`1.11.3 <2014-01-08>`
* :release:`1.10.5 <2014-01-08>`
* :bug:`225 (1.12+)` Note ecdsa requirement in README. Thanks to Amaury
  Rodriguez for the catch.
* :bug:`176` Fix AttributeError bugs in known_hosts file (re)loading. Thanks
  to Nathan Scowcroft for the patch & Martin Blumenstingl for the initial test
  case.
* :release:`1.12.0 <2013-09-27>`
* :release:`1.11.2 <2013-09-27>`
* :release:`1.10.4 <2013-09-27>`
* :feature:`152` Add tentative support for ECDSA keys. **This adds the ecdsa
  module as a new dependency of Paramiko.** The module is available at
  `warner/python-ecdsa on Github <https://github.com/warner/python-ecdsa>`_ and
  `ecdsa on PyPI <https://pypi.python.org/pypi/ecdsa>`_.

    * Note that you might still run into problems with key negotiation --
      Paramiko picks the first key that the server offers, which might not be
      what you have in your known_hosts file.
    * Mega thanks to Ethan Glasser-Camp for the patch.

* :feature:`136` Add server-side support for the SSH protocol's 'env' command.
  Thanks to Benjamin Pollack for the patch.
* :bug:`156 (1.11+)` Fix potential deadlock condition when using Channel
  objects as sockets (e.g. when using SSH gatewaying). Thanks to Steven Noonan
  and Frank Arnold for catch & patch.
* :bug:`179` Fix a missing variable causing errors when an ssh_config file has
  a non-default AddressFamily set. Thanks to Ed Marshall & Tomaz Muraus for
  catch & patch.
* :bug:`200` Fix an exception-causing typo in ``demo_simple.py``. Thanks to Alex
  Buchanan for catch & Dave Foster for patch.
* :bug:`199` Typo fix in the license header cross-project. Thanks to Armin
  Ronacher for catch & patch.
* :release:`1.11.1 <2013-09-20>`
* :release:`1.10.3 <2013-09-20>`
* :bug:`162` Clean up HMAC module import to avoid deadlocks in certain uses of
  SSHClient. Thanks to Gernot Hillier for the catch & suggested fix.
* :bug:`36` Fix the port-forwarding demo to avoid file descriptor errors.
  Thanks to Jonathan Halcrow for catch & patch.
* :bug:`168` Update config handling to properly handle multiple 'localforward'
  and 'remoteforward' keys. Thanks to Emre Yılmaz for the patch.
* :release:`1.11.0 <2013-07-26>`
* :release:`1.10.2 <2013-07-26>`
* :bug:`98 major` On Windows, when interacting with the PuTTY PAgeant, Paramiko
  now creates the shared memory map with explicit Security Attributes of the
  user, which is the same technique employed by the canonical PuTTY library to
  avoid permissions issues when Paramiko is running under a different UAC
  context than the PuTTY Ageant process. Thanks to Jason R. Coombs for the
  patch.
* :support:`100` Remove use of PyWin32 in ``win_pageant`` module. Module was
  already dependent on ctypes for constructing appropriate structures and had
  ctypes implementations of all functionality. Thanks to Jason R. Coombs for
  the patch.
* :bug:`87 major` Ensure updates to ``known_hosts`` files account for any
  updates to said files after Paramiko initially read them. (Includes related
  fix to guard against duplicate entries during subsequent ``known_hosts``
  loads.) Thanks to ``@sunweaver`` for the contribution.
* :bug:`153` (also :issue:`67`) Warn on parse failure when reading known_hosts
  file.  Thanks to ``@glasserc`` for patch.
* :bug:`146` Indentation fixes for readability. Thanks to Abhinav Upadhyay for
  catch & patch.
* :release:`1.10.1 <2013-04-05>`
* :bug:`142` (`Fabric #811 <https://github.com/fabric/fabric/issues/811>`_)
  SFTP put of empty file will still return the attributes of the put file.
  Thanks to Jason R. Coombs for the patch.
* :bug:`154` (`Fabric #876 <https://github.com/fabric/fabric/issues/876>`_)
  Forwarded SSH agent connections left stale local pipes lying around, which
  could cause local (and sometimes remote or network) resource starvation when
  running many agent-using remote commands. Thanks to Kevin Tegtmeier for catch
  & patch.
* :release:`1.10.0 <2013-03-01>`
* :feature:`66` Batch SFTP writes to help speed up file transfers. Thanks to
  Olle Lundberg for the patch.
* :bug:`133 major` Fix handling of window-change events to be on-spec and not
  attempt to wait for a response from the remote sshd; this fixes problems with
  less common targets such as some Cisco devices. Thanks to Phillip Heller for
  catch & patch.
* :feature:`93` Overhaul SSH config parsing to be in line with ``man
  ssh_config`` (& the behavior of ``ssh`` itself), including addition of parameter
  expansion within config values. Thanks to Olle Lundberg for the patch.
* :feature:`110` Honor SSH config ``AddressFamily`` setting when looking up
  local host's FQDN. Thanks to John Hensley for the patch.
* :feature:`128` Defer FQDN resolution until needed, when parsing SSH config
  files.  Thanks to Parantapa Bhattacharya for catch & patch.
* :bug:`102 major` Forego random padding for packets when running under
  ``*-ctr`` ciphers.  This corrects some slowdowns on platforms where random
  byte generation is inefficient (e.g. Windows). Thanks to  ``@warthog618`` for
  catch & patch, and Michael van der Kolff for code/technique review.
* :feature:`127` Turn ``SFTPFile`` into a context manager. Thanks to Michael
  Williamson for the patch.
* :feature:`116` Limit ``Message.get_bytes`` to an upper bound of 1MB to protect
  against potential DoS vectors. Thanks to ``@mvschaik`` for catch & patch.
* :feature:`115` Add convenience ``get_pty`` kwarg to ``Client.exec_command`` so
  users not manually controlling a channel object can still toggle PTY
  creation. Thanks to Michael van der Kolff for the patch.
* :feature:`71` Add ``SFTPClient.putfo`` and ``.getfo`` methods to allow direct
  uploading/downloading of file-like objects. Thanks to Eric Buehl for the
  patch.
* :feature:`113` Add ``timeout`` parameter to ``SSHClient.exec_command`` for
  easier setting of the command's internal channel object's timeout. Thanks to
  Cernov Vladimir for the patch.
* :support:`94` Remove duplication of SSH port constant. Thanks to Olle
  Lundberg for the catch.
* :feature:`80` Expose the internal "is closed" property of the file transfer
  class ``BufferedFile`` as ``.closed``, better conforming to Python's file
  interface.  Thanks to ``@smunaut`` and James Hiscock for catch & patch.