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gh-104773: PEP 594: Remove the telnetlib module (#104778)

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1
Doc/library/superseded.rst
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@ -27,6 +27,5 @@ backwards compatibility. They have been superseded by other modules.
sndhdr.rst
spwd.rst
sunau.rst
telnetlib.rst
uu.rst
xdrlib.rst

262
Doc/library/telnetlib.rst
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@ -1,262 +0,0 @@
:mod:`telnetlib` --- Telnet client
==================================
.. module:: telnetlib
:synopsis: Telnet client class.
:deprecated:
.. sectionauthor:: Skip Montanaro <skip@pobox.com>
**Source code:** :source:`Lib/telnetlib.py`
.. index:: single: protocol; Telnet
.. deprecated-removed:: 3.11 3.13
The :mod:`telnetlib` module is deprecated
(see :pep:`PEP 594 <594#telnetlib>` for details and alternatives).
--------------
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).
.. include:: ../includes/wasm-notavail.rst
.. class:: Telnet(host=None, port=0[, timeout])
:class:`Telnet` represents a connection to a Telnet server. The instance is
initially not connected by default; the :meth:`~Telnet.open` method must be used to
establish a connection. Alternatively, the host name and optional port
number can be passed to the constructor too, in which case the connection to
the server will be established before the constructor returns. The optional
*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).
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.
A :class:`Telnet` object is a context manager and can be used in a
:keyword:`with` statement. When the :keyword:`!with` block ends, the
:meth:`close` method is called::
>>> from telnetlib import Telnet
>>> with Telnet('localhost', 23) as tn:
... tn.interact()
...
.. versionchanged:: 3.6 Context manager support added
.. 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)
Read until a given byte string, *expected*, is encountered or until *timeout*
seconds have passed.
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.
.. method:: Telnet.read_all()
Read all data until EOF as bytes; block until connection closed.
.. method:: Telnet.read_some()
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.
.. method:: Telnet.read_very_eager()
Read everything that can be without blocking in I/O (eager).
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.
.. method:: Telnet.read_eager()
Read readily available data.
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.
.. method:: Telnet.read_lazy()
Process and return data already in the queues (lazy).
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.
.. method:: Telnet.read_very_lazy()
Return any data available in the cooked queue (very lazy).
Raise :exc:`EOFError` if connection closed and no data available. Return
``b''`` if no cooked data available otherwise. This method never blocks.
.. 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])
Connect to a host. The optional second argument is the port number, which
defaults to the standard Telnet port (23). The optional *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).
Do not try to reopen an already connected instance.
.. audit-event:: telnetlib.Telnet.open self,host,port telnetlib.Telnet.open
.. method:: Telnet.msg(msg, *args)
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)
Write a byte string to the socket, doubling any IAC characters. This can
block if the connection is blocked. May raise :exc:`OSError` if the
connection is closed.
.. audit-event:: telnetlib.Telnet.write self,buffer telnetlib.Telnet.write
.. versionchanged:: 3.3
This method used to raise :exc:`socket.error`, which is now an alias
of :exc:`OSError`.
.. 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)
Read until one from a list of a regular expressions matches.
The first argument is a list of regular expressions, either compiled
(:ref:`regex objects <re-objects>`) or uncompiled (byte strings). The
optional second argument is a timeout, in seconds; the default is to block
indefinitely.
Return a tuple of three items: the index in the list of the first regular
expression that matches; the match object returned; and the bytes read up
till and including the match.
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).
If a regular expression ends with a greedy match (such as ``.*``) or if more
than one expression can match the same input, the results are
non-deterministic, and may depend on the I/O timing.
.. 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: ")
password = getpass.getpass()
tn = telnetlib.Telnet(HOST)
tn.read_until(b"login: ")
tn.write(user.encode('ascii') + b"\n")
if password:
tn.read_until(b"Password: ")
tn.write(password.encode('ascii') + b"\n")
tn.write(b"ls\n")
tn.write(b"exit\n")
print(tn.read_all().decode('ascii'))

1
Doc/tools/.nitignore
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@ -215,7 +215,6 @@ Doc/library/sys_path_init.rst
Doc/library/sysconfig.rst
Doc/library/syslog.rst
Doc/library/tarfile.rst
Doc/library/telnetlib.rst
Doc/library/tempfile.rst
Doc/library/termios.rst
Doc/library/test.rst

2
Doc/whatsnew/2.6.rst
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@ -2465,7 +2465,7 @@ changes, or look through the Subversion logs for all the details.
(All changes contributed by Lars Gustäbel).
* An optional ``timeout`` parameter was added to the
:class:`telnetlib.Telnet` class constructor, specifying a timeout
:class:`!telnetlib.Telnet` class constructor, specifying a timeout
measured in seconds. (Added by Facundo Batista.)
* The :class:`tempfile.NamedTemporaryFile` class usually deletes

2
Doc/whatsnew/3.11.rst
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@ -1731,7 +1731,7 @@ Modules
slated for removal in Python 3.13:
+---------------------+---------------------+---------------------+---------------------+---------------------+
| :mod:`aifc` | :mod:`chunk` | :mod:`msilib` | :mod:`pipes` | :mod:`telnetlib` |
| :mod:`aifc` | :mod:`chunk` | :mod:`msilib` | :mod:`pipes` | :mod:`!telnetlib` |
+---------------------+---------------------+---------------------+---------------------+---------------------+
| :mod:`audioop` | :mod:`crypt` | :mod:`nis` | :mod:`sndhdr` | :mod:`uu` |
+---------------------+---------------------+---------------------+---------------------+---------------------+

2
Doc/whatsnew/3.12.rst
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@ -819,7 +819,7 @@ Modules (see :pep:`594`):
* :mod:`sndhdr`
* :mod:`spwd`
* :mod:`sunau`
* :mod:`telnetlib`
* :mod:`!telnetlib`
* :mod:`uu`
* :mod:`xdrlib`

4
Doc/whatsnew/3.13.rst
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@ -102,6 +102,10 @@ Deprecated
Removed
=======
* :pep:`594`: Remove the :mod:`!telnetlib` module, deprecated in Python 3.11:
use the projects `telnetlib3 <https://pypi.org/project/telnetlib3/>`_ or
`Exscript <https://pypi.org/project/Exscript/>`_ instead.
(Contributed by Victor Stinner in :gh:`104773`.)
Porting to Python 3.13

2
Doc/whatsnew/3.6.rst
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@ -1520,7 +1520,7 @@ rather than the version that is being emulated for the process
telnetlib
---------
:class:`~telnetlib.Telnet` is now a context manager (contributed by
:class:`!telnetlib.Telnet` is now a context manager (contributed by
Stéphane Wirtel in :issue:`25485`).

679
Lib/telnetlib.py
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@ -1,679 +0,0 @@
r"""TELNET client class.
Based on RFC 854: TELNET Protocol Specification, by J. Postel and
J. Reynolds
Example:
>>> from telnetlib import Telnet
>>> tn = Telnet('www.python.org', 79) # connect to finger port
>>> tn.write(b'guido\r\n')
>>> print(tn.read_all())
Login Name TTY Idle When Where
guido Guido van Rossum pts/2 <Dec 2 11:10> snag.cnri.reston..
>>>
Note that read_all() won't read until eof -- it just reads some data
-- but it guarantees to read at least one byte unless EOF is hit.
It is possible to pass a Telnet object to a selector in order to wait until
more data is available. Note that in this case, read_eager() may return b''
even if there was data on the socket, because the protocol negotiation may have
eaten the data. This is why EOFError is needed in some cases to distinguish
between "no data" and "connection closed" (since the socket also appears ready
for reading when it is closed).
To do:
- option negotiation
- timeout should be intrinsic to the connection object instead of an
option on one of the read calls only
"""
# Imported modules
import sys
import socket
import selectors
from time import monotonic as _time
import warnings
warnings._deprecated(__name__, remove=(3, 13))
__all__ = ["Telnet"]
# Tunable parameters
DEBUGLEVEL = 0
# Telnet protocol defaults
TELNET_PORT = 23
# Telnet protocol characters (don't change)
IAC = bytes([255]) # "Interpret As Command"
DONT = bytes([254])
DO = bytes([253])
WONT = bytes([252])
WILL = bytes([251])
theNULL = bytes([0])
SE = bytes([240]) # Subnegotiation End
NOP = bytes([241]) # No Operation
DM = bytes([242]) # Data Mark
BRK = bytes([243]) # Break
IP = bytes([244]) # Interrupt process
AO = bytes([245]) # Abort output
AYT = bytes([246]) # Are You There
EC = bytes([247]) # Erase Character
EL = bytes([248]) # Erase Line
GA = bytes([249]) # Go Ahead
SB = bytes([250]) # Subnegotiation Begin
# Telnet protocol options code (don't change)
# These ones all come from arpa/telnet.h
BINARY = bytes([0]) # 8-bit data path
ECHO = bytes([1]) # echo
RCP = bytes([2]) # prepare to reconnect
SGA = bytes([3]) # suppress go ahead
NAMS = bytes([4]) # approximate message size
STATUS = bytes([5]) # give status
TM = bytes([6]) # timing mark
RCTE = bytes([7]) # remote controlled transmission and echo
NAOL = bytes([8]) # negotiate about output line width
NAOP = bytes([9]) # negotiate about output page size
NAOCRD = bytes([10]) # negotiate about CR disposition
NAOHTS = bytes([11]) # negotiate about horizontal tabstops
NAOHTD = bytes([12]) # negotiate about horizontal tab disposition
NAOFFD = bytes([13]) # negotiate about formfeed disposition
NAOVTS = bytes([14]) # negotiate about vertical tab stops
NAOVTD = bytes([15]) # negotiate about vertical tab disposition
NAOLFD = bytes([16]) # negotiate about output LF disposition
XASCII = bytes([17]) # extended ascii character set
LOGOUT = bytes([18]) # force logout
BM = bytes([19]) # byte macro
DET = bytes([20]) # data entry terminal
SUPDUP = bytes([21]) # supdup protocol
SUPDUPOUTPUT = bytes([22]) # supdup output
SNDLOC = bytes([23]) # send location
TTYPE = bytes([24]) # terminal type
EOR = bytes([25]) # end or record
TUID = bytes([26]) # TACACS user identification
OUTMRK = bytes([27]) # output marking
TTYLOC = bytes([28]) # terminal location number
VT3270REGIME = bytes([29]) # 3270 regime
X3PAD = bytes([30]) # X.3 PAD
NAWS = bytes([31]) # window size
TSPEED = bytes([32]) # terminal speed
LFLOW = bytes([33]) # remote flow control
LINEMODE = bytes([34]) # Linemode option
XDISPLOC = bytes([35]) # X Display Location
OLD_ENVIRON = bytes([36]) # Old - Environment variables
AUTHENTICATION = bytes([37]) # Authenticate
ENCRYPT = bytes([38]) # Encryption option
NEW_ENVIRON = bytes([39]) # New - Environment variables
# the following ones come from
# http://www.iana.org/assignments/telnet-options
# Unfortunately, that document does not assign identifiers
# to all of them, so we are making them up
TN3270E = bytes([40]) # TN3270E
XAUTH = bytes([41]) # XAUTH
CHARSET = bytes([42]) # CHARSET
RSP = bytes([43]) # Telnet Remote Serial Port
COM_PORT_OPTION = bytes([44]) # Com Port Control Option
SUPPRESS_LOCAL_ECHO = bytes([45]) # Telnet Suppress Local Echo
TLS = bytes([46]) # Telnet Start TLS
KERMIT = bytes([47]) # KERMIT
SEND_URL = bytes([48]) # SEND-URL
FORWARD_X = bytes([49]) # FORWARD_X
PRAGMA_LOGON = bytes([138]) # TELOPT PRAGMA LOGON
SSPI_LOGON = bytes([139]) # TELOPT SSPI LOGON
PRAGMA_HEARTBEAT = bytes([140]) # TELOPT PRAGMA HEARTBEAT
EXOPL = bytes([255]) # Extended-Options-List
NOOPT = bytes([0])
# poll/select have the advantage of not requiring any extra file descriptor,
# contrarily to epoll/kqueue (also, they require a single syscall).
if hasattr(selectors, 'PollSelector'):
_TelnetSelector = selectors.PollSelector
else:
_TelnetSelector = selectors.SelectSelector
class Telnet:
"""Telnet interface class.
An instance of this class represents a connection to a telnet
server. The instance is initially not connected; the open()
method must be used to establish a connection. Alternatively, the
host name and optional port number can be passed to the
constructor, too.
Don't try to reopen an already connected instance.
This class has many read_*() methods. Note that some of them
raise EOFError when the end of the connection is read, because
they can return an empty string for other reasons. See the
individual doc strings.
read_until(expected, [timeout])
Read until the expected string has been seen, or a timeout is
hit (default is no timeout); may block.
read_all()
Read all data until EOF; may block.
read_some()
Read at least one byte or EOF; may block.
read_very_eager()
Read all data available already queued or on the socket,
without blocking.
read_eager()
Read either data already queued or some data available on the
socket, without blocking.
read_lazy()
Read all data in the raw queue (processing it first), without
doing any socket I/O.
read_very_lazy()
Reads all data in the cooked queue, without doing any socket
I/O.
read_sb_data()
Reads available data between SB ... SE sequence. Don't block.
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, option)
option will be chr(0) when there is no option.
No other action is done afterwards by telnetlib.
"""
def __init__(self, host=None, port=0,
timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
"""Constructor.
When called without arguments, create an unconnected instance.
With a hostname argument, it connects the instance; port number
and timeout are optional.
"""
self.debuglevel = DEBUGLEVEL
self.host = host
self.port = port
self.timeout = timeout
self.sock = None
self.rawq = b''
self.irawq = 0
self.cookedq = b''
self.eof = 0
self.iacseq = b'' # Buffer for IAC sequence.
self.sb = 0 # flag for SB and SE sequence.
self.sbdataq = b''
self.option_callback = None
if host is not None:
self.open(host, port, timeout)
def open(self, host, port=0, timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
"""Connect to a host.
The optional second argument is the port number, which
defaults to the standard telnet port (23).
Don't try to reopen an already connected instance.
"""
self.eof = 0
if not port:
port = TELNET_PORT
self.host = host
self.port = port
self.timeout = timeout
sys.audit("telnetlib.Telnet.open", self, host, port)
self.sock = socket.create_connection((host, port), timeout)
def __del__(self):
"""Destructor -- close the connection."""
self.close()
def msg(self, msg, *args):
"""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.
"""
if self.debuglevel > 0:
print('Telnet(%s,%s):' % (self.host, self.port), end=' ')
if args:
print(msg % args)
else:
print(msg)
def set_debuglevel(self, debuglevel):
"""Set the debug level.
The higher it is, the more debug output you get (on sys.stdout).
"""
self.debuglevel = debuglevel
def close(self):
"""Close the connection."""
sock = self.sock
self.sock = None
self.eof = True
self.iacseq = b''
self.sb = 0
if sock:
sock.close()
def get_socket(self):
"""Return the socket object used internally."""
return self.sock
def fileno(self):
"""Return the fileno() of the socket object used internally."""
return self.sock.fileno()
def write(self, buffer):
"""Write a string to the socket, doubling any IAC characters.
Can block if the connection is blocked. May raise
OSError if the connection is closed.
"""
if IAC in buffer:
buffer = buffer.replace(IAC, IAC+IAC)
sys.audit("telnetlib.Telnet.write", self, buffer)
self.msg("send %r", buffer)
self.sock.sendall(buffer)
def read_until(self, match, timeout=None):
"""Read until a given string is encountered or until timeout.
When no match is found, return whatever is available instead,
possibly the empty string. Raise EOFError if the connection
is closed and no cooked data is available.
"""
n = len(match)
self.process_rawq()
i = self.cookedq.find(match)
if i >= 0:
i = i+n
buf = self.cookedq[:i]
self.cookedq = self.cookedq[i:]
return buf
if timeout is not None:
deadline = _time() + timeout
with _TelnetSelector() as selector:
selector.register(self, selectors.EVENT_READ)
while not self.eof:
if selector.select(timeout):
i = max(0, len(self.cookedq)-n)
self.fill_rawq()
self.process_rawq()
i = self.cookedq.find(match, i)
if i >= 0:
i = i+n
buf = self.cookedq[:i]
self.cookedq = self.cookedq[i:]
return buf
if timeout is not None:
timeout = deadline - _time()
if timeout < 0:
break
return self.read_very_lazy()
def read_all(self):
"""Read all data until EOF; block until connection closed."""
self.process_rawq()
while not self.eof:
self.fill_rawq()
self.process_rawq()
buf = self.cookedq
self.cookedq = b''
return buf
def read_some(self):
"""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.
"""
self.process_rawq()
while not self.cookedq and not self.eof:
self.fill_rawq()
self.process_rawq()
buf = self.cookedq
self.cookedq = b''
return buf
def read_very_eager(self):
"""Read everything that's possible without blocking in I/O (eager).
Raise EOFError if connection closed and no cooked data
available. Return b'' if no cooked data available otherwise.
Don't block unless in the midst of an IAC sequence.
"""
self.process_rawq()
while not self.eof and self.sock_avail():
self.fill_rawq()
self.process_rawq()
return self.read_very_lazy()
def read_eager(self):
"""Read readily available data.
Raise EOFError if connection closed and no cooked data
available. Return b'' if no cooked data available otherwise.
Don't block unless in the midst of an IAC sequence.
"""
self.process_rawq()
while not self.cookedq and not self.eof and self.sock_avail():
self.fill_rawq()
self.process_rawq()
return self.read_very_lazy()
def read_lazy(self):
"""Process and return data that's already in the queues (lazy).
Raise EOFError if connection closed and no data available.
Return b'' if no cooked data available otherwise. Don't block
unless in the midst of an IAC sequence.
"""
self.process_rawq()
return self.read_very_lazy()
def read_very_lazy(self):
"""Return any data available in the cooked queue (very lazy).
Raise EOFError if connection closed and no data available.
Return b'' if no cooked data available otherwise. Don't block.
"""
buf = self.cookedq
self.cookedq = b''
if not buf and self.eof and not self.rawq:
raise EOFError('telnet connection closed')
return buf
def read_sb_data(self):
"""Return any data available in the SB ... SE queue.
Return b'' if no SB ... SE available. Should only be called
after seeing a SB or SE command. When a new SB command is
found, old unread SB data will be discarded. Don't block.
"""
buf = self.sbdataq
self.sbdataq = b''
return buf
def set_option_negotiation_callback(self, callback):
"""Provide a callback function called after each receipt of a telnet option."""
self.option_callback = callback
def process_rawq(self):
"""Transfer from raw queue to cooked queue.
Set self.eof when connection is closed. Don't block unless in
the midst of an IAC sequence.
"""
buf = [b'', b'']
try:
while self.rawq:
c = self.rawq_getchar()
if not self.iacseq:
if c == theNULL:
continue
if c == b"\021":
continue
if c != IAC:
buf[self.sb] = buf[self.sb] + c
continue
else:
self.iacseq += c
elif len(self.iacseq) == 1:
# 'IAC: IAC CMD [OPTION only for WILL/WONT/DO/DONT]'
if c in (DO, DONT, WILL, WONT):
self.iacseq += c
continue
self.iacseq = b''
if c == IAC:
buf[self.sb] = buf[self.sb] + c
else:
if c == SB: # SB ... SE start.
self.sb = 1
self.sbdataq = b''
elif c == SE:
self.sb = 0
self.sbdataq = self.sbdataq + buf[1]
buf[1] = b''
if self.option_callback:
# Callback is supposed to look into
# the sbdataq
self.option_callback(self.sock, c, NOOPT)
else:
# We can't offer automatic processing of
# suboptions. Alas, we should not get any
# unless we did a WILL/DO before.
self.msg('IAC %d not recognized' % ord(c))
elif len(self.iacseq) == 2:
cmd = self.iacseq[1:2]
self.iacseq = b''
opt = c
if cmd in (DO, DONT):
self.msg('IAC %s %d',
cmd == DO and 'DO' or 'DONT', ord(opt))
if self.option_callback:
self.option_callback(self.sock, cmd, opt)
else:
self.sock.sendall(IAC + WONT + opt)
elif cmd in (WILL, WONT):
self.msg('IAC %s %d',
cmd == WILL and 'WILL' or 'WONT', ord(opt))
if self.option_callback:
self.option_callback(self.sock, cmd, opt)
else:
self.sock.sendall(IAC + DONT + opt)
except EOFError: # raised by self.rawq_getchar()
self.iacseq = b'' # Reset on EOF
self.sb = 0
self.cookedq = self.cookedq + buf[0]
self.sbdataq = self.sbdataq + buf[1]
def rawq_getchar(self):
"""Get next char from raw queue.
Block if no data is immediately available. Raise EOFError
when connection is closed.
"""
if not self.rawq:
self.fill_rawq()
if self.eof:
raise EOFError
c = self.rawq[self.irawq:self.irawq+1]
self.irawq = self.irawq + 1
if self.irawq >= len(self.rawq):
self.rawq = b''
self.irawq = 0
return c
def fill_rawq(self):
"""Fill raw queue from exactly one recv() system call.
Block if no data is immediately available. Set self.eof when
connection is closed.
"""
if self.irawq >= len(self.rawq):
self.rawq = b''
self.irawq = 0
# The buffer size should be fairly small so as to avoid quadratic
# behavior in process_rawq() above
buf = self.sock.recv(50)
self.msg("recv %r", buf)
self.eof = (not buf)
self.rawq = self.rawq + buf
def sock_avail(self):
"""Test whether data is available on the socket."""
with _TelnetSelector() as selector:
selector.register(self, selectors.EVENT_READ)
return bool(selector.select(0))
def interact(self):
"""Interaction function, emulates a very dumb telnet client."""
if sys.platform == "win32":
self.mt_interact()
return
with _TelnetSelector() as selector:
selector.register(self, selectors.EVENT_READ)
selector.register(sys.stdin, selectors.EVENT_READ)
while True:
for key, events in selector.select():
if key.fileobj is self:
try:
text = self.read_eager()
except EOFError:
print('*** Connection closed by remote host ***')
return
if text:
sys.stdout.write(text.decode('ascii'))
sys.stdout.flush()
elif key.fileobj is sys.stdin:
line = sys.stdin.readline().encode('ascii')
if not line:
return
self.write(line)
def mt_interact(self):
"""Multithreaded version of interact()."""
import _thread
_thread.start_new_thread(self.listener, ())
while 1:
line = sys.stdin.readline()
if not line:
break
self.write(line.encode('ascii'))
def listener(self):
"""Helper for mt_interact() -- this executes in the other thread."""
while 1:
try:
data = self.read_eager()
except EOFError:
print('*** Connection closed by remote host ***')
return
if data:
sys.stdout.write(data.decode('ascii'))
else:
sys.stdout.flush()
def expect(self, list, timeout=None):
"""Read until one from a list of a regular expressions matches.
The first argument is a list of regular expressions, either
compiled (re.Pattern instances) or uncompiled (strings).
The optional second argument is a timeout, in seconds; default
is no timeout.
Return a tuple of three items: the index in the list of the
first regular expression that matches; the re.Match object
returned; and the text read up till and including the match.
If EOF is read and no text was read, raise EOFError.
Otherwise, when nothing matches, return (-1, None, text) where
text is the text received so far (may be the empty string if a
timeout happened).
If a regular expression ends with a greedy match (e.g. '.*')
or if more than one expression can match the same input, the
results are undeterministic, and may depend on the I/O timing.
"""
re = None
list = list[:]
indices = range(len(list))
for i in indices:
if not hasattr(list[i], "search"):
if not re: import re
list[i] = re.compile(list[i])
if timeout is not None:
deadline = _time() + timeout
with _TelnetSelector() as selector:
selector.register(self, selectors.EVENT_READ)
while not self.eof:
self.process_rawq()
for i in indices:
m = list[i].search(self.cookedq)
if m:
e = m.end()
text = self.cookedq[:e]
self.cookedq = self.cookedq[e:]
return (i, m, text)
if timeout is not None:
ready = selector.select(timeout)
timeout = deadline - _time()
if not ready:
if timeout < 0:
break
else:
continue
self.fill_rawq()
text = self.read_very_lazy()
if not text and self.eof:
raise EOFError
return (-1, None, text)
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
self.close()
def test():
"""Test program for telnetlib.
Usage: python telnetlib.py [-d] ... [host [port]]
Default host is localhost; default port is 23.
"""
debuglevel = 0
while sys.argv[1:] and sys.argv[1] == '-d':
debuglevel = debuglevel+1
del sys.argv[1]
host = 'localhost'
if sys.argv[1:]:
host = sys.argv[1]
port = 0
if sys.argv[2:]:
portstr = sys.argv[2]
try:
port = int(portstr)
except ValueError:
port = socket.getservbyname(portstr, 'tcp')
with Telnet() as tn:
tn.set_debuglevel(debuglevel)
tn.open(host, port, timeout=0.5)
tn.interact()
if __name__ == '__main__':
test()

405
Lib/test/test_telnetlib.py
View file

@ -1,405 +0,0 @@
import socket
import selectors
import threading
import contextlib
from test import support
from test.support import socket_helper, warnings_helper
import unittest
support.requires_working_socket(module=True)
telnetlib = warnings_helper.import_deprecated('telnetlib')
HOST = socket_helper.HOST
def server(evt, serv):
serv.listen()
evt.set()
try:
conn, addr = serv.accept()
conn.close()
except TimeoutError:
pass
finally:
serv.close()
class GeneralTests(unittest.TestCase):
def setUp(self):
self.evt = threading.Event()
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock.settimeout(60) # Safety net. Look issue 11812
self.port = socket_helper.bind_port(self.sock)
self.thread = threading.Thread(target=server, args=(self.evt,self.sock))
self.thread.daemon = True
self.thread.start()
self.evt.wait()
def tearDown(self):
self.thread.join()
del self.thread # Clear out any dangling Thread objects.
def testBasic(self):
# connects
telnet = telnetlib.Telnet(HOST, self.port)
telnet.sock.close()
def testContextManager(self):
with telnetlib.Telnet(HOST, self.port) as tn:
self.assertIsNotNone(tn.get_socket())
self.assertIsNone(tn.get_socket())
def testTimeoutDefault(self):
self.assertTrue(socket.getdefaulttimeout() is None)
socket.setdefaulttimeout(30)
try:
telnet = telnetlib.Telnet(HOST, self.port)
finally:
socket.setdefaulttimeout(None)
self.assertEqual(telnet.sock.gettimeout(), 30)
telnet.sock.close()
def testTimeoutNone(self):
# None, having other default
self.assertTrue(socket.getdefaulttimeout() is None)
socket.setdefaulttimeout(30)
try:
telnet = telnetlib.Telnet(HOST, self.port, timeout=None)
finally:
socket.setdefaulttimeout(None)
self.assertTrue(telnet.sock.gettimeout() is None)
telnet.sock.close()
def testTimeoutValue(self):
telnet = telnetlib.Telnet(HOST, self.port, timeout=30)
self.assertEqual(telnet.sock.gettimeout(), 30)
telnet.sock.close()
def testTimeoutOpen(self):
telnet = telnetlib.Telnet()
telnet.open(HOST, self.port, timeout=30)
self.assertEqual(telnet.sock.gettimeout(), 30)
telnet.sock.close()
def testGetters(self):
# Test telnet getter methods
telnet = telnetlib.Telnet(HOST, self.port, timeout=30)
t_sock = telnet.sock
self.assertEqual(telnet.get_socket(), t_sock)
self.assertEqual(telnet.fileno(), t_sock.fileno())
telnet.sock.close()
class SocketStub(object):
''' a socket proxy that re-defines sendall() '''
def __init__(self, reads=()):
self.reads = list(reads) # Intentionally make a copy.
self.writes = []
self.block = False
def sendall(self, data):
self.writes.append(data)
def recv(self, size):
out = b''
while self.reads and len(out) < size:
out += self.reads.pop(0)
if len(out) > size:
self.reads.insert(0, out[size:])
out = out[:size]
return out
class TelnetAlike(telnetlib.Telnet):
def fileno(self):
raise NotImplementedError()
def close(self): pass
def sock_avail(self):
return (not self.sock.block)
def msg(self, msg, *args):
with support.captured_stdout() as out:
telnetlib.Telnet.msg(self, msg, *args)
self._messages += out.getvalue()
return
class MockSelector(selectors.BaseSelector):
def __init__(self):
self.keys = {}
@property
def resolution(self):
return 1e-3
def register(self, fileobj, events, data=None):
key = selectors.SelectorKey(fileobj, 0, events, data)
self.keys[fileobj] = key
return key
def unregister(self, fileobj):
return self.keys.pop(fileobj)
def select(self, timeout=None):
block = False
for fileobj in self.keys:
if isinstance(fileobj, TelnetAlike):
block = fileobj.sock.block
break
if block:
return []
else:
return [(key, key.events) for key in self.keys.values()]
def get_map(self):
return self.keys
@contextlib.contextmanager
def test_socket(reads):
def new_conn(*ignored):
return SocketStub(reads)
try:
old_conn = socket.create_connection
socket.create_connection = new_conn
yield None
finally:
socket.create_connection = old_conn
return
def test_telnet(reads=(), cls=TelnetAlike):
''' return a telnetlib.Telnet object that uses a SocketStub with
reads queued up to be read '''
for x in reads:
assert type(x) is bytes, x
with test_socket(reads):
telnet = cls('dummy', 0)
telnet._messages = '' # debuglevel output
return telnet
class ExpectAndReadTestCase(unittest.TestCase):
def setUp(self):
self.old_selector = telnetlib._TelnetSelector
telnetlib._TelnetSelector = MockSelector
def tearDown(self):
telnetlib._TelnetSelector = self.old_selector
class ReadTests(ExpectAndReadTestCase):
def test_read_until(self):
"""
read_until(expected, timeout=None)
test the blocking version of read_util
"""
want = [b'xxxmatchyyy']
telnet = test_telnet(want)
data = telnet.read_until(b'match')
self.assertEqual(data, b'xxxmatch', msg=(telnet.cookedq, telnet.rawq, telnet.sock.reads))
reads = [b'x' * 50, b'match', b'y' * 50]
expect = b''.join(reads[:-1])
telnet = test_telnet(reads)
data = telnet.read_until(b'match')
self.assertEqual(data, expect)
def test_read_all(self):
"""
read_all()
Read all data until EOF; may block.
"""
reads = [b'x' * 500, b'y' * 500, b'z' * 500]
expect = b''.join(reads)
telnet = test_telnet(reads)
data = telnet.read_all()
self.assertEqual(data, expect)
return
def test_read_some(self):
"""
read_some()
Read at least one byte or EOF; may block.
"""
# test 'at least one byte'
telnet = test_telnet([b'x' * 500])
data = telnet.read_some()
self.assertTrue(len(data) >= 1)
# test EOF
telnet = test_telnet()
data = telnet.read_some()
self.assertEqual(b'', data)
def _read_eager(self, func_name):
"""
read_*_eager()
Read all data available already queued or on the socket,
without blocking.
"""
want = b'x' * 100
telnet = test_telnet([want])
func = getattr(telnet, func_name)
telnet.sock.block = True
self.assertEqual(b'', func())
telnet.sock.block = False
data = b''
while True:
try:
data += func()
except EOFError:
break
self.assertEqual(data, want)
def test_read_eager(self):
# read_eager and read_very_eager make the same guarantees
# (they behave differently but we only test the guarantees)
self._read_eager('read_eager')
self._read_eager('read_very_eager')
# NB -- we need to test the IAC block which is mentioned in the
# docstring but not in the module docs
def read_very_lazy(self):
want = b'x' * 100
telnet = test_telnet([want])
self.assertEqual(b'', telnet.read_very_lazy())
while telnet.sock.reads:
telnet.fill_rawq()
data = telnet.read_very_lazy()
self.assertEqual(want, data)
self.assertRaises(EOFError, telnet.read_very_lazy)
def test_read_lazy(self):
want = b'x' * 100
telnet = test_telnet([want])
self.assertEqual(b'', telnet.read_lazy())
data = b''
while True:
try:
read_data = telnet.read_lazy()
data += read_data
if not read_data:
telnet.fill_rawq()
except EOFError:
break
self.assertTrue(want.startswith(data))
self.assertEqual(data, want)
class nego_collector(object):
def __init__(self, sb_getter=None):
self.seen = b''
self.sb_getter = sb_getter
self.sb_seen = b''
def do_nego(self, sock, cmd, opt):
self.seen += cmd + opt
if cmd == tl.SE and self.sb_getter:
sb_data = self.sb_getter()
self.sb_seen += sb_data
tl = telnetlib
class WriteTests(unittest.TestCase):
'''The only thing that write does is replace each tl.IAC for
tl.IAC+tl.IAC'''
def test_write(self):
data_sample = [b'data sample without IAC',
b'data sample with' + tl.IAC + b' one IAC',
b'a few' + tl.IAC + tl.IAC + b' iacs' + tl.IAC,
tl.IAC,
b'']
for data in data_sample:
telnet = test_telnet()
telnet.write(data)
written = b''.join(telnet.sock.writes)
self.assertEqual(data.replace(tl.IAC,tl.IAC+tl.IAC), written)
class OptionTests(unittest.TestCase):
# RFC 854 commands
cmds = [tl.AO, tl.AYT, tl.BRK, tl.EC, tl.EL, tl.GA, tl.IP, tl.NOP]
def _test_command(self, data):
""" helper for testing IAC + cmd """
telnet = test_telnet(data)
data_len = len(b''.join(data))
nego = nego_collector()
telnet.set_option_negotiation_callback(nego.do_nego)
txt = telnet.read_all()
cmd = nego.seen
self.assertTrue(len(cmd) > 0) # we expect at least one command
self.assertIn(cmd[:1], self.cmds)
self.assertEqual(cmd[1:2], tl.NOOPT)
self.assertEqual(data_len, len(txt + cmd))
nego.sb_getter = None # break the nego => telnet cycle
def test_IAC_commands(self):
for cmd in self.cmds:
self._test_command([tl.IAC, cmd])
self._test_command([b'x' * 100, tl.IAC, cmd, b'y'*100])
self._test_command([b'x' * 10, tl.IAC, cmd, b'y'*10])
# all at once
self._test_command([tl.IAC + cmd for (cmd) in self.cmds])
def test_SB_commands(self):
# RFC 855, subnegotiations portion
send = [tl.IAC + tl.SB + tl.IAC + tl.SE,
tl.IAC + tl.SB + tl.IAC + tl.IAC + tl.IAC + tl.SE,
tl.IAC + tl.SB + tl.IAC + tl.IAC + b'aa' + tl.IAC + tl.SE,
tl.IAC + tl.SB + b'bb' + tl.IAC + tl.IAC + tl.IAC + tl.SE,
tl.IAC + tl.SB + b'cc' + tl.IAC + tl.IAC + b'dd' + tl.IAC + tl.SE,
]
telnet = test_telnet(send)
nego = nego_collector(telnet.read_sb_data)
telnet.set_option_negotiation_callback(nego.do_nego)
txt = telnet.read_all()
self.assertEqual(txt, b'')
want_sb_data = tl.IAC + tl.IAC + b'aabb' + tl.IAC + b'cc' + tl.IAC + b'dd'
self.assertEqual(nego.sb_seen, want_sb_data)
self.assertEqual(b'', telnet.read_sb_data())
nego.sb_getter = None # break the nego => telnet cycle
def test_debuglevel_reads(self):
# test all the various places that self.msg(...) is called
given_a_expect_b = [
# Telnet.fill_rawq
(b'a', ": recv b''\n"),
# Telnet.process_rawq
(tl.IAC + bytes([88]), ": IAC 88 not recognized\n"),
(tl.IAC + tl.DO + bytes([1]), ": IAC DO 1\n"),
(tl.IAC + tl.DONT + bytes([1]), ": IAC DONT 1\n"),
(tl.IAC + tl.WILL + bytes([1]), ": IAC WILL 1\n"),
(tl.IAC + tl.WONT + bytes([1]), ": IAC WONT 1\n"),
]
for a, b in given_a_expect_b:
telnet = test_telnet([a])
telnet.set_debuglevel(1)
txt = telnet.read_all()
self.assertIn(b, telnet._messages)
return
def test_debuglevel_write(self):
telnet = test_telnet()
telnet.set_debuglevel(1)
telnet.write(b'xxx')
expected = "send b'xxx'\n"
self.assertIn(expected, telnet._messages)
def test_debug_accepts_str_port(self):
# Issue 10695
with test_socket([]):
telnet = TelnetAlike('dummy', '0')
telnet._messages = ''
telnet.set_debuglevel(1)
telnet.msg('test')
self.assertRegex(telnet._messages, r'0.*test')
class ExpectTests(ExpectAndReadTestCase):
def test_expect(self):
"""
expect(expected, [timeout])
Read until the expected string has been seen, or a timeout is
hit (default is no timeout); may block.
"""
want = [b'x' * 10, b'match', b'y' * 10]
telnet = test_telnet(want)
(_,_,data) = telnet.expect([b'match'])
self.assertEqual(data, b''.join(want[:-1]))
if __name__ == '__main__':
unittest.main()

2
Misc/NEWS.d/3.9.0a1.rst
View file

@ -99,7 +99,7 @@ after whitespace, e.g. '127.0.0.1 whatever'.
Adds audit events for :mod:`ensurepip`, :mod:`ftplib`, :mod:`glob`,
:mod:`imaplib`, :mod:`nntplib`, :mod:`pdb`, :mod:`poplib`, :mod:`shutil`,
:mod:`smtplib`, :mod:`sqlite3`, :mod:`subprocess`, :mod:`telnetlib`,
:mod:`smtplib`, :mod:`sqlite3`, :mod:`subprocess`, :mod:`!telnetlib`,
:mod:`tempfile` and :mod:`webbrowser`, as well as :func:`os.listdir`,
:func:`os.scandir` and :func:`breakpoint`.

2
Misc/NEWS.d/next/Library/2023-05-23-02-20-13.gh-issue-104773.7K59zr.rst Normal file
View file

@ -0,0 +1,2 @@
:pep:`594`: Remove the :mod:`!telnetlib` module, deprecated in Python 3.11.
Patch by Victor Stinner.

1
Python/stdlib_module_names.h generated
View file

@ -261,7 +261,6 @@ static const char* _Py_stdlib_module_names[] = {
"syslog",
"tabnanny",
"tarfile",
"telnetlib",
"tempfile",
"termios",
"textwrap",

1
Tools/wasm/wasm_assets.py
View file

@ -78,7 +78,6 @@ OMIT_NETWORKING_FILES = (
"poplib.py",
"smtplib.py",
"socketserver.py",
"telnetlib.py",
# keep urllib.parse for pydoc
"urllib/error.py",
"urllib/request.py",