mirror of https://github.com/python/cpython.git
152 lines
5.0 KiB
TeX
152 lines
5.0 KiB
TeX
% LaTeX'ized from the comments in the module by Skip Montanaro
|
|
% <skip@mojam.com>.
|
|
|
|
\section{\module{telnetlib} ---
|
|
Telnet client}
|
|
|
|
\declaremodule{standard}{telnetlib}
|
|
\modulesynopsis{Telnet client class.}
|
|
|
|
|
|
The \module{telnetlib} module provides a \class{Telnet} class that
|
|
implements the Telnet protocol. See \rfc{854} for details about the
|
|
protocol.
|
|
|
|
|
|
\begin{classdesc}{Telnet}{\optional{host\optional{, port}}}
|
|
\class{Telnet} represents a connection to a telnet server. The
|
|
instance is initially not connected; the \method{open()} method must
|
|
be used to establish a connection. Alternatively, the host name and
|
|
optional port number can be passed to the constructor, too.
|
|
|
|
Do not reopen an already connected instance.
|
|
|
|
This class has many \method{read_*()} methods. Note that some of them
|
|
raise \exception{EOFError} when the end of the connection is read,
|
|
because they can return an empty string for other reasons. See the
|
|
individual descriptions below.
|
|
\end{classdesc}
|
|
|
|
|
|
\subsection{Telnet Objects \label{telnet-objects}}
|
|
|
|
\class{Telnet} instances have the following methods:
|
|
|
|
|
|
\begin{methoddesc}{read_until}{expected\optional{, timeout}}
|
|
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 \exception{EOFError} if the connection
|
|
is closed and no cooked data is available.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{read_all}{}
|
|
Read all data until \EOF{}; block until connection closed.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{read_some}{}
|
|
Read at least one byte of cooked data unless \EOF{} is hit.
|
|
Return \code{''} if \EOF{} is hit. Block if no data is immediately
|
|
available.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{read_very_eager}{}
|
|
Read everything that can be without blocking in I/O (eager).
|
|
|
|
Raise \exception{EOFError} if connection closed and no cooked data
|
|
available. Return \code{''} if no cooked data available otherwise.
|
|
Do not block unless in the midst of an IAC sequence.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{read_eager}{}
|
|
Read readily available data.
|
|
|
|
Raise \exception{EOFError} if connection closed and no cooked data
|
|
available. Return \code{''} if no cooked data available otherwise.
|
|
Do not block unless in the midst of an IAC sequence.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{read_lazy}{}
|
|
Process and return data already in the queues (lazy).
|
|
|
|
Raise \exception{EOFError} if connection closed and no data available.
|
|
Return \code{''} if no cooked data available otherwise. Do not block
|
|
unless in the midst of an IAC sequence.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{read_very_lazy}{}
|
|
Return any data available in the cooked queue (very lazy).
|
|
|
|
Raise \exception{EOFError} if connection closed and no data available.
|
|
Return \code{''} if no cooked data available otherwise. This method
|
|
never blocks.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{open}{host\optional{, port}}
|
|
Connect to a host.
|
|
The optional second argument is the port number, which
|
|
defaults to the standard telnet port (23).
|
|
|
|
Do not try to reopen an already connected instance.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{msg}{msg\optional{, *args}}
|
|
Print a debug message when the debug level is \code{>} 0.
|
|
If extra arguments are present, they are substituted in the
|
|
message using the standard string formatting operator.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{set_debuglevel}{debuglevel}
|
|
Set the debug level. The higher the value of \var{debuglevel}, the
|
|
more debug output you get (on \code{sys.stdout}).
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{close}{}
|
|
Close the connection.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{get_socket}{}
|
|
Return the socket object used internally.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{fileno}{}
|
|
Return the file descriptor of the socket object used internally.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{write}{buffer}
|
|
Write a string to the socket, doubling any IAC characters.
|
|
This can block if the connection is blocked. May raise
|
|
\exception{socket.error} if the connection is closed.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{interact}{}
|
|
Interaction function, emulates a very dumb telnet client.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{mt_interact}{}
|
|
Multithreaded version of \method{interact()}.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}{expect}{list\optional{, timeout}}
|
|
Read until one from a list of a regular expressions matches.
|
|
|
|
The first argument is a list of regular expressions, either
|
|
compiled (\class{re.RegexObject} instances) or uncompiled (strings).
|
|
The optional second argument is a timeout, in seconds; the default
|
|
is to block indefinately.
|
|
|
|
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 end of file is found and no text was read, raise
|
|
\exception{EOFError}. Otherwise, when nothing matches, return
|
|
\code{(-1, None, \var{text})} where \var{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. \regexp{.*})
|
|
or if more than one expression can match the same input, the
|
|
results are undeterministic, and may depend on the I/O timing.
|
|
\end{methoddesc}
|