cpython/Doc/library/telnetlib.rst

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:mod:`telnetlib` --- Telnet client
==================================
.. module:: telnetlib
:synopsis: Telnet client class.
Merged revisions 59407-59422 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r59407 | armin.rigo | 2007-12-07 20:19:55 +0100 (Fri, 07 Dec 2007) | 2 lines This is probably what was meant here. ........ r59410 | guido.van.rossum | 2007-12-08 05:38:23 +0100 (Sat, 08 Dec 2007) | 2 lines Be (just a bit :) more specific about release date. ........ r59411 | alexandre.vassalotti | 2007-12-08 05:49:22 +0100 (Sat, 08 Dec 2007) | 3 lines Fix issue #1530. Return an error exit status if not all tests passes. ........ r59413 | georg.brandl | 2007-12-08 11:56:39 +0100 (Sat, 08 Dec 2007) | 2 lines Fix tpyo. ........ r59414 | georg.brandl | 2007-12-08 12:05:05 +0100 (Sat, 08 Dec 2007) | 2 lines Fix markup in whatsnew, use new directive in ACKS. ........ r59415 | georg.brandl | 2007-12-08 12:05:36 +0100 (Sat, 08 Dec 2007) | 2 lines Fix Eren's name. ........ r59416 | georg.brandl | 2007-12-08 12:23:13 +0100 (Sat, 08 Dec 2007) | 2 lines Add examples to the datetime documentation. Written for GHOP by "h4wk.cz". ........ r59417 | skip.montanaro | 2007-12-08 15:37:43 +0100 (Sat, 08 Dec 2007) | 2 lines Note that open() is the preferred way to open files (issue 1510). ........ r59418 | skip.montanaro | 2007-12-08 16:23:31 +0100 (Sat, 08 Dec 2007) | 1 line + "context manager" ........ r59419 | skip.montanaro | 2007-12-08 16:26:16 +0100 (Sat, 08 Dec 2007) | 1 line correct email address ........ r59420 | skip.montanaro | 2007-12-08 16:33:24 +0100 (Sat, 08 Dec 2007) | 3 lines When splitting, avoid making a copy of the string if the split doesn't find anything (issue 1538). ........
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.. sectionauthor:: Skip Montanaro <skip@pobox.com>
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.. index:: single: protocol; Telnet
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**Source code:** :source:`Lib/telnetlib.py`
--------------
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The :mod:`telnetlib` module provides a :class:`Telnet` class that implements the
Telnet protocol. See :rfc:`854` for details about the protocol. In addition, it
provides symbolic constants for the protocol characters (see below), and for the
telnet options. The symbolic names of the telnet options follow the definitions
in ``arpa/telnet.h``, with the leading ``TELOPT_`` removed. For symbolic names
of options which are traditionally not included in ``arpa/telnet.h``, see the
module source itself.
The symbolic constants for the telnet commands are: IAC, DONT, DO, WONT, WILL,
SE (Subnegotiation End), NOP (No Operation), DM (Data Mark), BRK (Break), IP
(Interrupt process), AO (Abort output), AYT (Are You There), EC (Erase
Character), EL (Erase Line), GA (Go Ahead), SB (Subnegotiation Begin).
.. class:: Telnet(host=None, port=0[, timeout])
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:class:`Telnet` represents a connection to a Telnet server. The instance is
initially not connected by default; the :meth:`open` method must be used to
Merged revisions 62998-63003,63005-63006,63009-63012,63014-63017,63019-63020,63022-63024,63026-63029,63031-63041,63043-63045,63047-63054,63056-63062 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r62998 | andrew.kuchling | 2008-05-10 15:51:55 -0400 (Sat, 10 May 2008) | 7 lines #1858 from Tarek Ziade: Allow multiple repositories in .pypirc; see http://wiki.python.org/moin/EnhancedPyPI for discussion. The patch is slightly revised from Tarek's last patch: I've simplified the PyPIRCCommand.finalize_options() method to not look at sys.argv. Tests still pass. ........ r63000 | alexandre.vassalotti | 2008-05-10 15:59:16 -0400 (Sat, 10 May 2008) | 5 lines Cleaned up io._BytesIO.write(). I am amazed that the old code, for inserting null-bytes, actually worked. Who wrote that thing? Oh, it is me... doh. ........ r63002 | brett.cannon | 2008-05-10 16:52:01 -0400 (Sat, 10 May 2008) | 2 lines Revert r62998 as it broke the build (seems distutils.config is missing). ........ r63014 | andrew.kuchling | 2008-05-10 18:12:38 -0400 (Sat, 10 May 2008) | 1 line #1858: add distutils.config module ........ r63027 | brett.cannon | 2008-05-10 21:09:32 -0400 (Sat, 10 May 2008) | 2 lines Flesh out the 3.0 deprecation to suggest using the ctypes module. ........ r63028 | skip.montanaro | 2008-05-10 22:59:30 -0400 (Sat, 10 May 2008) | 4 lines Copied two versions of the example from the interactive session. Delete one. ........ r63037 | georg.brandl | 2008-05-11 03:02:17 -0400 (Sun, 11 May 2008) | 2 lines reload() takes the module itself. ........ r63038 | alexandre.vassalotti | 2008-05-11 03:06:04 -0400 (Sun, 11 May 2008) | 4 lines Added test framework for handling module renames. Factored the import guard in test_py3kwarn.TestStdlibRemovals into a context manager, namely test_support.CleanImport. ........ r63039 | georg.brandl | 2008-05-11 03:06:05 -0400 (Sun, 11 May 2008) | 2 lines #2742: ``''`` is not converted to NULL in getaddrinfo. ........ r63040 | alexandre.vassalotti | 2008-05-11 03:08:12 -0400 (Sun, 11 May 2008) | 2 lines Fixed typo in a comment of test_support.CleanImport. ........ r63041 | alexandre.vassalotti | 2008-05-11 03:10:25 -0400 (Sun, 11 May 2008) | 2 lines Removed a dead line of code. ........ r63043 | georg.brandl | 2008-05-11 04:47:53 -0400 (Sun, 11 May 2008) | 2 lines #2812: document property.getter/setter/deleter. ........ r63049 | georg.brandl | 2008-05-11 05:06:30 -0400 (Sun, 11 May 2008) | 2 lines #1153769: document PEP 237 changes to string formatting. ........ r63050 | georg.brandl | 2008-05-11 05:11:40 -0400 (Sun, 11 May 2008) | 2 lines #2809: elaborate str.split docstring a bit. ........ r63051 | georg.brandl | 2008-05-11 06:13:59 -0400 (Sun, 11 May 2008) | 2 lines Fix typo. ........ r63052 | georg.brandl | 2008-05-11 06:33:27 -0400 (Sun, 11 May 2008) | 2 lines #2709: clarification. ........ r63053 | georg.brandl | 2008-05-11 06:42:28 -0400 (Sun, 11 May 2008) | 2 lines #2659: add ``break_on_hyphens`` to TextWrapper. ........ r63057 | georg.brandl | 2008-05-11 06:59:39 -0400 (Sun, 11 May 2008) | 2 lines #2741: clarification of value range for address_family. ........ r63058 | georg.brandl | 2008-05-11 07:09:35 -0400 (Sun, 11 May 2008) | 2 lines #2452: timeout is used for all blocking operations. ........ r63059 | andrew.kuchling | 2008-05-11 09:33:56 -0400 (Sun, 11 May 2008) | 2 lines #1792: Improve performance of marshal.dumps() on large objects by increasing the size of the buffer more quickly. ........ r63060 | andrew.kuchling | 2008-05-11 10:00:00 -0400 (Sun, 11 May 2008) | 1 line #1858: re-apply patch for this, adding the missing files ........ r63061 | benjamin.peterson | 2008-05-11 10:13:25 -0400 (Sun, 11 May 2008) | 2 lines Add the "until" command to pdb ........ r63062 | georg.brandl | 2008-05-11 10:17:13 -0400 (Sun, 11 May 2008) | 2 lines Add some sentence endings. ........
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establish a connection. Alternatively, the host name and optional port
number can be passed to the constructor, to, in which case the connection to
the server will be established before the constructor returns. The optional
Merged revisions 62998-63003,63005-63006,63009-63012,63014-63017,63019-63020,63022-63024,63026-63029,63031-63041,63043-63045,63047-63054,63056-63062 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r62998 | andrew.kuchling | 2008-05-10 15:51:55 -0400 (Sat, 10 May 2008) | 7 lines #1858 from Tarek Ziade: Allow multiple repositories in .pypirc; see http://wiki.python.org/moin/EnhancedPyPI for discussion. The patch is slightly revised from Tarek's last patch: I've simplified the PyPIRCCommand.finalize_options() method to not look at sys.argv. Tests still pass. ........ r63000 | alexandre.vassalotti | 2008-05-10 15:59:16 -0400 (Sat, 10 May 2008) | 5 lines Cleaned up io._BytesIO.write(). I am amazed that the old code, for inserting null-bytes, actually worked. Who wrote that thing? Oh, it is me... doh. ........ r63002 | brett.cannon | 2008-05-10 16:52:01 -0400 (Sat, 10 May 2008) | 2 lines Revert r62998 as it broke the build (seems distutils.config is missing). ........ r63014 | andrew.kuchling | 2008-05-10 18:12:38 -0400 (Sat, 10 May 2008) | 1 line #1858: add distutils.config module ........ r63027 | brett.cannon | 2008-05-10 21:09:32 -0400 (Sat, 10 May 2008) | 2 lines Flesh out the 3.0 deprecation to suggest using the ctypes module. ........ r63028 | skip.montanaro | 2008-05-10 22:59:30 -0400 (Sat, 10 May 2008) | 4 lines Copied two versions of the example from the interactive session. Delete one. ........ r63037 | georg.brandl | 2008-05-11 03:02:17 -0400 (Sun, 11 May 2008) | 2 lines reload() takes the module itself. ........ r63038 | alexandre.vassalotti | 2008-05-11 03:06:04 -0400 (Sun, 11 May 2008) | 4 lines Added test framework for handling module renames. Factored the import guard in test_py3kwarn.TestStdlibRemovals into a context manager, namely test_support.CleanImport. ........ r63039 | georg.brandl | 2008-05-11 03:06:05 -0400 (Sun, 11 May 2008) | 2 lines #2742: ``''`` is not converted to NULL in getaddrinfo. ........ r63040 | alexandre.vassalotti | 2008-05-11 03:08:12 -0400 (Sun, 11 May 2008) | 2 lines Fixed typo in a comment of test_support.CleanImport. ........ r63041 | alexandre.vassalotti | 2008-05-11 03:10:25 -0400 (Sun, 11 May 2008) | 2 lines Removed a dead line of code. ........ r63043 | georg.brandl | 2008-05-11 04:47:53 -0400 (Sun, 11 May 2008) | 2 lines #2812: document property.getter/setter/deleter. ........ r63049 | georg.brandl | 2008-05-11 05:06:30 -0400 (Sun, 11 May 2008) | 2 lines #1153769: document PEP 237 changes to string formatting. ........ r63050 | georg.brandl | 2008-05-11 05:11:40 -0400 (Sun, 11 May 2008) | 2 lines #2809: elaborate str.split docstring a bit. ........ r63051 | georg.brandl | 2008-05-11 06:13:59 -0400 (Sun, 11 May 2008) | 2 lines Fix typo. ........ r63052 | georg.brandl | 2008-05-11 06:33:27 -0400 (Sun, 11 May 2008) | 2 lines #2709: clarification. ........ r63053 | georg.brandl | 2008-05-11 06:42:28 -0400 (Sun, 11 May 2008) | 2 lines #2659: add ``break_on_hyphens`` to TextWrapper. ........ r63057 | georg.brandl | 2008-05-11 06:59:39 -0400 (Sun, 11 May 2008) | 2 lines #2741: clarification of value range for address_family. ........ r63058 | georg.brandl | 2008-05-11 07:09:35 -0400 (Sun, 11 May 2008) | 2 lines #2452: timeout is used for all blocking operations. ........ r63059 | andrew.kuchling | 2008-05-11 09:33:56 -0400 (Sun, 11 May 2008) | 2 lines #1792: Improve performance of marshal.dumps() on large objects by increasing the size of the buffer more quickly. ........ r63060 | andrew.kuchling | 2008-05-11 10:00:00 -0400 (Sun, 11 May 2008) | 1 line #1858: re-apply patch for this, adding the missing files ........ r63061 | benjamin.peterson | 2008-05-11 10:13:25 -0400 (Sun, 11 May 2008) | 2 lines Add the "until" command to pdb ........ r63062 | georg.brandl | 2008-05-11 10:17:13 -0400 (Sun, 11 May 2008) | 2 lines Add some sentence endings. ........
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*timeout* parameter specifies a timeout in seconds for blocking operations
like the connection attempt (if not specified, the global default timeout
setting will be used).
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Do not reopen an already connected instance.
This class has many :meth:`read_\*` methods. Note that some of them raise
:exc:`EOFError` when the end of the connection is read, because they can return
an empty string for other reasons. See the individual descriptions below.
.. seealso::
:rfc:`854` - Telnet Protocol Specification
Definition of the Telnet protocol.
.. _telnet-objects:
Telnet Objects
--------------
:class:`Telnet` instances have the following methods:
.. method:: Telnet.read_until(expected, timeout=None)
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Read until a given byte string, *expected*, is encountered or until *timeout*
seconds have passed.
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When no match is found, return whatever is available instead, possibly empty
bytes. Raise :exc:`EOFError` if the connection is closed and no cooked data
is available.
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.. method:: Telnet.read_all()
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Read all data until EOF as bytes; block until connection closed.
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.. method:: Telnet.read_some()
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Read at least one byte of cooked data unless EOF is hit. Return ``b''`` if
EOF is hit. Block if no data is immediately available.
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.. method:: Telnet.read_very_eager()
Read everything that can be without blocking in I/O (eager).
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Raise :exc:`EOFError` if connection closed and no cooked data available.
Return ``b''`` if no cooked data available otherwise. Do not block unless in
the midst of an IAC sequence.
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.. method:: Telnet.read_eager()
Read readily available data.
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Raise :exc:`EOFError` if connection closed and no cooked data available.
Return ``b''`` if no cooked data available otherwise. Do not block unless in
the midst of an IAC sequence.
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.. method:: Telnet.read_lazy()
Process and return data already in the queues (lazy).
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Raise :exc:`EOFError` if connection closed and no data available. Return
``b''`` if no cooked data available otherwise. Do not block unless in the
midst of an IAC sequence.
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.. method:: Telnet.read_very_lazy()
Return any data available in the cooked queue (very lazy).
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Raise :exc:`EOFError` if connection closed and no data available. Return
``b''`` if no cooked data available otherwise. This method never blocks.
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.. method:: Telnet.read_sb_data()
Return the data collected between a SB/SE pair (suboption begin/end). The
callback should access these data when it was invoked with a ``SE`` command.
This method never blocks.
.. method:: Telnet.open(host, port=0[, timeout])
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Connect to a host. The optional second argument is the port number, which
defaults to the standard Telnet port (23). The optional *timeout* parameter
Merged revisions 62998-63003,63005-63006,63009-63012,63014-63017,63019-63020,63022-63024,63026-63029,63031-63041,63043-63045,63047-63054,63056-63062 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r62998 | andrew.kuchling | 2008-05-10 15:51:55 -0400 (Sat, 10 May 2008) | 7 lines #1858 from Tarek Ziade: Allow multiple repositories in .pypirc; see http://wiki.python.org/moin/EnhancedPyPI for discussion. The patch is slightly revised from Tarek's last patch: I've simplified the PyPIRCCommand.finalize_options() method to not look at sys.argv. Tests still pass. ........ r63000 | alexandre.vassalotti | 2008-05-10 15:59:16 -0400 (Sat, 10 May 2008) | 5 lines Cleaned up io._BytesIO.write(). I am amazed that the old code, for inserting null-bytes, actually worked. Who wrote that thing? Oh, it is me... doh. ........ r63002 | brett.cannon | 2008-05-10 16:52:01 -0400 (Sat, 10 May 2008) | 2 lines Revert r62998 as it broke the build (seems distutils.config is missing). ........ r63014 | andrew.kuchling | 2008-05-10 18:12:38 -0400 (Sat, 10 May 2008) | 1 line #1858: add distutils.config module ........ r63027 | brett.cannon | 2008-05-10 21:09:32 -0400 (Sat, 10 May 2008) | 2 lines Flesh out the 3.0 deprecation to suggest using the ctypes module. ........ r63028 | skip.montanaro | 2008-05-10 22:59:30 -0400 (Sat, 10 May 2008) | 4 lines Copied two versions of the example from the interactive session. Delete one. ........ r63037 | georg.brandl | 2008-05-11 03:02:17 -0400 (Sun, 11 May 2008) | 2 lines reload() takes the module itself. ........ r63038 | alexandre.vassalotti | 2008-05-11 03:06:04 -0400 (Sun, 11 May 2008) | 4 lines Added test framework for handling module renames. Factored the import guard in test_py3kwarn.TestStdlibRemovals into a context manager, namely test_support.CleanImport. ........ r63039 | georg.brandl | 2008-05-11 03:06:05 -0400 (Sun, 11 May 2008) | 2 lines #2742: ``''`` is not converted to NULL in getaddrinfo. ........ r63040 | alexandre.vassalotti | 2008-05-11 03:08:12 -0400 (Sun, 11 May 2008) | 2 lines Fixed typo in a comment of test_support.CleanImport. ........ r63041 | alexandre.vassalotti | 2008-05-11 03:10:25 -0400 (Sun, 11 May 2008) | 2 lines Removed a dead line of code. ........ r63043 | georg.brandl | 2008-05-11 04:47:53 -0400 (Sun, 11 May 2008) | 2 lines #2812: document property.getter/setter/deleter. ........ r63049 | georg.brandl | 2008-05-11 05:06:30 -0400 (Sun, 11 May 2008) | 2 lines #1153769: document PEP 237 changes to string formatting. ........ r63050 | georg.brandl | 2008-05-11 05:11:40 -0400 (Sun, 11 May 2008) | 2 lines #2809: elaborate str.split docstring a bit. ........ r63051 | georg.brandl | 2008-05-11 06:13:59 -0400 (Sun, 11 May 2008) | 2 lines Fix typo. ........ r63052 | georg.brandl | 2008-05-11 06:33:27 -0400 (Sun, 11 May 2008) | 2 lines #2709: clarification. ........ r63053 | georg.brandl | 2008-05-11 06:42:28 -0400 (Sun, 11 May 2008) | 2 lines #2659: add ``break_on_hyphens`` to TextWrapper. ........ r63057 | georg.brandl | 2008-05-11 06:59:39 -0400 (Sun, 11 May 2008) | 2 lines #2741: clarification of value range for address_family. ........ r63058 | georg.brandl | 2008-05-11 07:09:35 -0400 (Sun, 11 May 2008) | 2 lines #2452: timeout is used for all blocking operations. ........ r63059 | andrew.kuchling | 2008-05-11 09:33:56 -0400 (Sun, 11 May 2008) | 2 lines #1792: Improve performance of marshal.dumps() on large objects by increasing the size of the buffer more quickly. ........ r63060 | andrew.kuchling | 2008-05-11 10:00:00 -0400 (Sun, 11 May 2008) | 1 line #1858: re-apply patch for this, adding the missing files ........ r63061 | benjamin.peterson | 2008-05-11 10:13:25 -0400 (Sun, 11 May 2008) | 2 lines Add the "until" command to pdb ........ r63062 | georg.brandl | 2008-05-11 10:17:13 -0400 (Sun, 11 May 2008) | 2 lines Add some sentence endings. ........
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specifies a timeout in seconds for blocking operations like the connection
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attempt (if not specified, the global default timeout setting will be used).
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Do not try to reopen an already connected instance.
.. method:: Telnet.msg(msg, *args)
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Print a debug message when the debug level is ``>`` 0. If extra arguments are
present, they are substituted in the message using the standard string
formatting operator.
.. method:: Telnet.set_debuglevel(debuglevel)
Set the debug level. The higher the value of *debuglevel*, the more debug
output you get (on ``sys.stdout``).
.. method:: Telnet.close()
Close the connection.
.. method:: Telnet.get_socket()
Return the socket object used internally.
.. method:: Telnet.fileno()
Return the file descriptor of the socket object used internally.
.. method:: Telnet.write(buffer)
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Write a byte string to the socket, doubling any IAC characters. This can
block if the connection is blocked. May raise :exc:`socket.error` if the
connection is closed.
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.. method:: Telnet.interact()
Interaction function, emulates a very dumb Telnet client.
.. method:: Telnet.mt_interact()
Multithreaded version of :meth:`interact`.
.. method:: Telnet.expect(list, timeout=None)
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Read until one from a list of a regular expressions matches.
The first argument is a list of regular expressions, either compiled
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(:class:`re.RegexObject` instances) or uncompiled (byte strings). The
optional second argument is a timeout, in seconds; the default is to block
indefinitely.
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Return a tuple of three items: the index in the list of the first regular
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expression that matches; the match object returned; and the bytes read up
till and including the match.
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If end of file is found and no bytes were read, raise :exc:`EOFError`.
Otherwise, when nothing matches, return ``(-1, None, data)`` where *data* is
the bytes received so far (may be empty bytes if a timeout happened).
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If a regular expression ends with a greedy match (such as ``.*``) or if more
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than one expression can match the same input, the results are
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non-deterministic, and may depend on the I/O timing.
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.. method:: Telnet.set_option_negotiation_callback(callback)
Each time a telnet option is read on the input flow, this *callback* (if set) is
called with the following parameters : callback(telnet socket, command
(DO/DONT/WILL/WONT), option). No other action is done afterwards by telnetlib.
.. _telnet-example:
Telnet Example
--------------
.. sectionauthor:: Peter Funk <pf@artcom-gmbh.de>
A simple example illustrating typical use::
import getpass
import telnetlib
HOST = "localhost"
user = input("Enter your remote account: ")
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password = getpass.getpass()
tn = telnetlib.Telnet(HOST)
tn.read_until(b"login: ")
tn.write(user.encode('ascii') + b"\n")
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if password:
tn.read_until(b"Password: ")
tn.write(password.encode('ascii') + b"\n")
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tn.write(b"ls\n")
tn.write(b"exit\n")
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print(tn.read_all().decode('ascii'))
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