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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 select.select() 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
i N( u monotonic( u timeu Telneti i� i� i� i� i� i� i� i� i� i� i� i� i� i� i� i� i i i i i i i i i i
i i i
i i i i i i i i i i i i i i i i i i i! i" i# i$ i% i& i' i( i) i* i+ i, i- i. i/ i0 i1 i� i� i� c B s� | Ee Z d Z d Z d? d e j d d � Z d e j d d � Z d d � Z d d
� Z
d d � Z d
d � Z d d � Z
d d � Z d d � Z d? d d � Z d d � Z d? d d � Z d d � Z d d � Z d d � Z d! d" � Z d# d$ � Z d% d& � Z d' d( � Z d) d* � Z d+ d, � Z d- d. � Z d/ d0 � Z d1 d2 � Z d3 d4 � Z d5 d6 � Z d7 d8 � Z! d? d9 d: � Z" d? d; d< � Z# d? d= d> � Z$ d? S(@ u Telnetu� 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.
i c C s� t | _ | | _ | | _ | | _ d | _ d | _ d | _ d | _ d | _
d | _ d | _ d | _
d | _ t t d � | _ | d k r� | j | | | � n d S( u� Constructor.
When called without arguments, create an unconnected instance.
With a hostname argument, it connects the instance; port number
and timeout are optional.
s i u pollN( u
DEBUGLEVELu
debuglevelu hostu portu timeoutu Noneu socku rawqu irawqu cookedqu eofu iacsequ sbu sbdataqu option_callbacku hasattru selectu _has_pollu open( u selfu hostu portu timeout( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu __init__� s u Telnet.__init__c C sR d | _ | s t } n | | _ | | _ | | _ t j | | f | � | _ d S( u� 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.
i N( u eofu TELNET_PORTu hostu portu timeoutu socketu create_connectionu sock( u selfu hostu portu timeout( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu open� s u Telnet.openc C s | j � d S( u# Destructor -- close the connection.N( u close( u self( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu __del__� s u Telnet.__del__c G sW | j d k rS t d | j | j f d d �| rF t | | � qS t | � n d S( u� 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.
i u Telnet(%s,%s):u endu N( u
debuglevelu printu hostu port( u selfu msgu args( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu msg� s
u
Telnet.msgc C s
| | _ d S( uh Set the debug level.
The higher it is, the more debug output you get (on sys.stdout).
N( u
debuglevel( u selfu
debuglevel( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu set_debuglevel� s u Telnet.set_debuglevelc C sA | j r | j j � n d | _ d | _ d | _ d | _ d S( u Close the connection.i i s N( u socku closeu eofu iacsequ sb( u self( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu close s u Telnet.closec C s | j S( u) Return the socket object used internally.( u sock( u self( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu
get_socket s u Telnet.get_socketc C s
| j j � S( u9 Return the fileno() of the socket object used internally.( u socku fileno( u self( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu fileno s u
Telnet.filenoc C sI t | k r% | j t t t � } n | j d | � | j j | � d S( u� Write a string to the socket, doubling any IAC characters.
Can block if the connection is blocked. May raise
socket.error if the connection is closed.
u send %rN( u IACu replaceu msgu socku sendall( u selfu buffer( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu write s u Telnet.writec C s- | j r | j | | � S| j | | � Sd S( u 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( u _has_pollu _read_until_with_pollu _read_until_with_select( u selfu matchu timeout( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu
read_until s u Telnet.read_untilc C s, t | � } | } | d k r* t � } n | j � | j j | � } | d k r�t j � } t j t j B} | j
| | � xN| d k r�| j r�y) | j | d k r� d n d | � } Wni t j k
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| @r3t d t | j � | � } | j � | j � | j j | | � } q3q3W| d k r� t � | } | | k r�Pn | | } q� q� W| j | � n | d k r"| | } | j d | � } | j | d � | _ | S| j � S( u� Read until a given string is encountered or until timeout.
This method uses select.poll() to implement the timeout.
i i� N( u lenu Noneu _timeu process_rawqu cookedqu findu selectu pollu POLLINu POLLPRIu registeru eofu erroru errnou EINTRu maxu fill_rawqu
unregisteru read_very_lazy( u selfu matchu timeoutu nu call_timeoutu
time_startu iu polleru poll_in_or_priority_flagsu readyu eu elapsedu fdu modeu buf( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu _read_until_with_poll- sN
u Telnet._read_until_with_pollc
C s� t | � } | j � | j j | � } | d k rk | | } | j d | � } | j | d � | _ | S| g g g f } | } | d k r� | | f } t � } n x� | j r�t j | � | k r�t d t | j � | � } | j � | j � | j j | | � } | d k rR| | } | j d | � } | j | d � | _ | S| d k r� t � | } | | k r{Pn | | | f } q� q� W| j
� S( u~ Read until a given string is encountered or until timeout.
The timeout is implemented using select.select().
i N( u lenu process_rawqu cookedqu findu Noneu _timeu eofu selectu maxu fill_rawqu read_very_lazy(
u selfu matchu timeoutu nu iu bufu s_replyu s_argsu
time_startu elapsed( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu _read_until_with_selectZ s:
"
u Telnet._read_until_with_selectc C sD | j � x! | j s- | j � | j � q
W| j } d | _ | S( u7 Read all data until EOF; block until connection closed.s ( u process_rawqu eofu fill_rawqu cookedq( u selfu buf( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu read_all} s
u Telnet.read_allc C sO | j � x, | j r8 | j r8 | j � | j � q
W| j } d | _ | S( u� 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.
s ( u process_rawqu cookedqu eofu fill_rawq( u selfu buf( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu read_some� s
u Telnet.read_somec C sE | j � x. | j r: | j � r: | j � | j � q
W| j � S( u 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.
( u process_rawqu eofu
sock_availu fill_rawqu read_very_lazy( u self( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu read_very_eager� s
u Telnet.read_very_eagerc C sO | j � x8 | j rD | j rD | j � rD | j � | j � q
W| j � S( u� 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.
( u process_rawqu cookedqu eofu
sock_availu fill_rawqu read_very_lazy( u self( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu
read_eager� s
#
u Telnet.read_eagerc C s | j � | j � S( u 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.
( u process_rawqu read_very_lazy( u self( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu read_lazy� s
u Telnet.read_lazyc C s? | j } d | _ | r; | j r; | j r; t d � � n | S( u� 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.
s u telnet connection closed( u cookedqu eofu rawqu EOFError( u selfu buf( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu read_very_lazy� s
u Telnet.read_very_lazyc C s | j } d | _ | S( u 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.
s ( u sbdataq( u selfu buf( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu read_sb_data� s u Telnet.read_sb_datac C s
| | _ d S( uI Provide a callback function called after each receipt of a telnet option.N( u option_callback( u selfu callback( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu set_option_negotiation_callback� s u& Telnet.set_option_negotiation_callbackc
C s d d g } y�x�| j r�| j � } | j s� | t k rB q n | d k rT q n | t k r~ | | j | | | j <q q�| j | 7_ q t | j � d k r�| t t t t
f k r� | j | 7_ q n d | _ | t k r| | j | | | j <q�| t k r#d | _ d | _ n6 | t
k rYd | _ | j | d | _ d | d <n | j r{| j | j | t � q�| j d t | � � q t | j � d k r | j d d � } d | _ | } | t t f k rF| j d | t k r�d p�d t | � � | j r+| j | j | | � q�| j j t t
| � q�| t t
f k r�| j d | t k rsd
pvd t | � � | j r�| j | j | | � q�| j j t t | � q�q q WWn$ t k
r�d | _ d | _ Yn X| j | d | _ | j | d | _ d S(
u� 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.
s s i i u IAC %d not recognizedi u IAC %s %du DOu DONTu WILLu WONTN( u rawqu rawq_getcharu iacsequ theNULLu IACu sbu lenu DOu DONTu WILLu WONTu SBu sbdataqu SEu option_callbacku socku NOOPTu msgu ordu sendallu EOFErroru cookedq( u selfu bufu cu cmdu opt( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu process_rawq� sh
" " &
u Telnet.process_rawqc C s� | j s( | j � | j r( t � q( n | j | j | j d � } | j d | _ | j t | j � k r� d | _ d | _ n | S( u� Get next char from raw queue.
Block if no data is immediately available. Raise EOFError
when connection is closed.
i s i ( u rawqu fill_rawqu eofu EOFErroru irawqu len( u selfu c( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu rawq_getchar" s
u Telnet.rawq_getcharc C sm | j t | j � k r- d | _ d | _ n | j j d � } | j d | � | | _ | j | | _ d S( u� Fill raw queue from exactly one recv() system call.
Block if no data is immediately available. Set self.eof when
connection is closed.
s i i2 u recv %rN( u irawqu lenu rawqu socku recvu msgu eof( u selfu buf( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu fill_rawq4 s
u Telnet.fill_rawqc C s+ t j | g g g d � | g g g f k S( u- Test whether data is available on the socket.i ( u select( u self( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu
sock_availE s u Telnet.sock_availc C s� t j d k r | j � d Sx� t j | t j g g g � \ } } } | | k r� y | j � } Wn t k
r� t d � PYn X| r� t j j | j
d � � t j j � q� n t j | k r t j j � j
d � } | s� Pn | j | � q q d S( u9 Interaction function, emulates a very dumb telnet client.u win32Nu( *** Connection closed by remote host ***u ascii( u sysu platformu mt_interactu selectu stdinu
read_eageru EOFErroru printu stdoutu writeu decodeu flushu readlineu encode( u selfu rfdu wfdu xfdu textu line( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu interactI s&
'
u Telnet.interactc C sX d d l } | j | j f � x2 t j j � } | s; Pn | j | j d � � q" d S( u$ Multithreaded version of interact().i Nu ascii( u _threadu start_new_threadu listeneru sysu stdinu readlineu writeu encode( u selfu _threadu line( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu mt_interact_ s u Telnet.mt_interactc C sl xe y | j � } Wn t k
r5 t d � d SYn X| rX t j j | j d � � q t j j � q d S( u> Helper for mt_interact() -- this executes in the other thread.u( *** Connection closed by remote host ***Nu ascii( u
read_eageru EOFErroru printu sysu stdoutu writeu decodeu flush( u selfu data( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu listeneri s
u Telnet.listenerc C s- | j r | j | | � S| j | | � Sd S( u� Read until one from a list of a regular expressions matches.
The first argument is a list of regular expressions, either
compiled (re.RegexObject 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 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.
N( u _has_pollu _expect_with_pollu _expect_with_select( u selfu listu timeout( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu expectv s u
Telnet.expectc C s d } | d d � } t t | � � } xP | D]H } t | | d � s/ | s] d d l } n | j | | � | | <q/ q/ W| } | d k r� t � } n | j � d } xc | D][ } | | j | j � } | r� | j
� } | j d | � }
| j | d � | _ Pq� q� W| s�t j � } t j
t j B} | j | | � x~| r�| j r�y) | j | d k rpd n d | � }
Wni t j k
r�} zF | j t j k r�| d k r�t � | } | | } n wDn � WYd d } ~ Xn Xx� |
D]� \ } } | | @r�| j � | j � xf | D][ } | | j | j � } | r"| j
� } | j d | � }
| j | d � | _ Pq"q"Wq�q�W| d k rDt � | } | | k r�Pn | | } qDqDW| j | � n | r�| | |
f S| j � }
|
r
| j r
t � n d d |
f S( u� Read until one from a list of a regular expressions matches.
This method uses select.poll() to implement the timeout.
Nu searchi i� i i����( u Noneu rangeu lenu hasattru reu compileu _timeu process_rawqu searchu cookedqu endu selectu pollu POLLINu POLLPRIu registeru eofu erroru errnou EINTRu fill_rawqu
unregisteru read_very_lazyu EOFError( u selfu expect_listu timeoutu reu indicesu iu call_timeoutu
time_startu mu eu textu polleru poll_in_or_priority_flagsu readyu elapsedu fdu mode( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu _expect_with_poll� st
u Telnet._expect_with_pollc C s� d } | d d � } t t | � � } xP | D]H } t | | d � s/ | s] d d l } n | j | | � | | <q/ q/ W| d k r� t � } n x | j � xl | D]d } | | j | j � } | r� | j
� } | j d | � } | j | d � | _ | | | f Sq� W| j r Pn | d k r�t � | }
|
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} | s�Pq�n | j � q� | j � } | r�| j r�t � n d d | f S( u� Read until one from a list of a regular expressions matches.
The timeout is implemented using select.select().
Nu searchi i i����( u Noneu rangeu lenu hasattru reu compileu _timeu process_rawqu searchu cookedqu endu eofu filenou selectu fill_rawqu read_very_lazyu EOFError( u selfu listu timeoutu reu indicesu iu
time_startu mu eu textu elapsedu s_argsu ru wu x( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu _expect_with_select� sD
u Telnet._expect_with_selectN(% u __name__u
__module__u __qualname__u __doc__u Noneu socketu _GLOBAL_DEFAULT_TIMEOUTu __init__u openu __del__u msgu set_debuglevelu closeu
get_socketu filenou writeu
read_untilu _read_until_with_pollu _read_until_with_selectu read_allu read_someu read_very_eageru
read_eageru read_lazyu read_very_lazyu read_sb_datau set_option_negotiation_callbacku process_rawqu rawq_getcharu fill_rawqu
sock_availu interactu mt_interactu listeneru expectu _expect_with_pollu _expect_with_select( u
__locals__( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu Telnet� s@ 5
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?c C s d } x> t j d d � rF t j d d k rF | d } t j d =q Wd } t j d d � rp t j d } n d } t j d d � r� t j d } y t | � } Wq� t k
r� t j | d � } Yq� Xn t � } | j | � | j | | d d �| j � | j
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u� Test program for telnetlib.
Usage: python telnetlib.py [-d] ... [host [port]]
Default host is localhost; default port is 23.
i i Nu -du localhosti u tcpu timeoutg �?( u sysu argvu intu
ValueErroru socketu
getservbynameu Telnetu set_debuglevelu openu interactu close( u
debuglevelu hostu portu portstru tn( ( u. /opt/alt/python33/lib64/python3.3/telnetlib.pyu test� s& )
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