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| 1 | +% LaTeX'ized from the comments in the module by Skip Montanaro |
| 2 | + |
| 3 | + |
| 4 | +\section{\module{telnetlib} --- |
| 5 | + Telnet client} |
| 6 | + |
| 7 | +\declaremodule{standard}{telnetlib} |
| 8 | +\modulesynopsis{Telnet client class.} |
| 9 | + |
| 10 | + |
| 11 | +The \module{telnetlib} module provides a \class{Telnet} class that |
| 12 | +implements the Telnet protocol. See \rfc{854} for details about the |
| 13 | +protocol. |
| 14 | + |
| 15 | + |
| 16 | +\begin{classdesc}{Telnet}{\optional{host\optional{, port=0}}} |
| 17 | +\class{Telnet} represents a connection to a telnet server. The |
| 18 | +instance is initially not connected; the \method{open()} method must |
| 19 | +be used to establish a connection. Alternatively, the host name and |
| 20 | +optional port number can be passed to the constructor, too. |
| 21 | + |
| 22 | +Do not reopen an already connected instance. |
| 23 | + |
| 24 | +This class has many \method{read_*()} methods. Note that some of them |
| 25 | +raise \exception{EOFError} when the end of the connection is read, |
| 26 | +because they can return an empty string for other reasons. See the |
| 27 | +individual doc strings. |
| 28 | +\end{classdesc} |
| 29 | + |
| 30 | + |
| 31 | +\subsection{Telnet Objects \label{telnet-objects}} |
| 32 | + |
| 33 | +\class{Telnet} instances have the following methods: |
| 34 | + |
| 35 | + |
| 36 | +\begin{methoddesc}[Telnet]{read_until}{expected\optional{, timeout}} |
| 37 | +Read until a given string is encountered or until timeout. |
| 38 | + |
| 39 | +When no match is found, return whatever is available instead, |
| 40 | +possibly the empty string. Raise \exception{EOFError} if the connection |
| 41 | +is closed and no cooked data is available. |
| 42 | +\end{methoddesc} |
| 43 | + |
| 44 | +\begin{methoddesc}[Telnet]{read_all}{} |
| 45 | +Read all data until EOF; block until connection closed. |
| 46 | +\end{methoddesc} |
| 47 | + |
| 48 | +\begin{methoddesc}[Telnet]{read_some}{} |
| 49 | +Read at least one byte of cooked data unless EOF is hit. |
| 50 | + |
| 51 | +Return \code{''} if EOF is hit. Block if no data is immediately available. |
| 52 | +\end{methoddesc} |
| 53 | + |
| 54 | +\begin{methoddesc}[Telnet]{read_very_eager}{} |
| 55 | +Read everything that's possible without blocking in I/O (eager). |
| 56 | + |
| 57 | +Raise \exception{EOFError} if connection closed and no cooked data |
| 58 | +available. Return \code{''} if no cooked data available otherwise. |
| 59 | +Don't block unless in the midst of an IAC sequence. |
| 60 | +\end{methoddesc} |
| 61 | + |
| 62 | +\begin{methoddesc}[Telnet]{read_eager}{} |
| 63 | +Read readily available data. |
| 64 | + |
| 65 | +Raise \exception{EOFError} if connection closed and no cooked data |
| 66 | +available. Return \code{''} if no cooked data available otherwise. |
| 67 | +Don't block unless in the midst of an IAC sequence. |
| 68 | +\end{methoddesc} |
| 69 | + |
| 70 | +\begin{methoddesc}[Telnet]{read_lazy}{} |
| 71 | +Process and return data that's already in the queues (lazy). |
| 72 | + |
| 73 | +Raise \exception{EOFError} if connection closed and no data available. |
| 74 | +Return \code{''} if no cooked data available otherwise. Don't block |
| 75 | +unless in the midst of an IAC sequence. |
| 76 | +\end{methoddesc} |
| 77 | + |
| 78 | +\begin{methoddesc}[Telnet]{read_very_lazy}{} |
| 79 | +Return any data available in the cooked queue (very lazy). |
| 80 | + |
| 81 | +Raise \exception{EOFError} if connection closed and no data available. |
| 82 | +Return \code{''} if no cooked data available otherwise. Don't block. |
| 83 | +\end{methoddesc} |
| 84 | + |
| 85 | +\begin{methoddesc}[Telnet]{open}{host\optional{, port=0}} |
| 86 | +Connect to a host. |
| 87 | + |
| 88 | +The optional second argument is the port number, which |
| 89 | +defaults to the standard telnet port (23). |
| 90 | + |
| 91 | +Don't try to reopen an already connected instance. |
| 92 | +\end{methoddesc} |
| 93 | + |
| 94 | +\begin{methoddesc}[Telnet]{msg}{msg\optional{, *args}} |
| 95 | +Print a debug message, when the debug level is > 0. |
| 96 | + |
| 97 | +If extra arguments are present, they are substituted in the |
| 98 | +message using the standard string formatting operator. |
| 99 | +\end{methoddesc} |
| 100 | + |
| 101 | +\begin{methoddesc}[Telnet]{set_debuglevel}{debuglevel} |
| 102 | +Set the debug level. |
| 103 | + |
| 104 | +The higher it is, the more debug output you get (on sys.stdout). |
| 105 | +\end{methoddesc} |
| 106 | + |
| 107 | +\begin{methoddesc}[Telnet]{close}{} |
| 108 | +Close the connection. |
| 109 | +\end{methoddesc} |
| 110 | + |
| 111 | +\begin{methoddesc}[Telnet]{get_socket}{} |
| 112 | +Return the socket object used internally. |
| 113 | +\end{methoddesc} |
| 114 | + |
| 115 | +\begin{methoddesc}[Telnet]{fileno}{} |
| 116 | +Return the fileno() of the socket object used internally. |
| 117 | +\end{methoddesc} |
| 118 | + |
| 119 | +\begin{methoddesc}[Telnet]{write}{buffer} |
| 120 | +Write a string to the socket, doubling any IAC characters. |
| 121 | + |
| 122 | +Can block if the connection is blocked. May raise |
| 123 | +socket.error if the connection is closed. |
| 124 | +\end{methoddesc} |
| 125 | + |
| 126 | +\begin{methoddesc}[Telnet]{interact}{} |
| 127 | +Interaction function, emulates a very dumb telnet client. |
| 128 | +\end{methoddesc} |
| 129 | + |
| 130 | +\begin{methoddesc}[Telnet]{mt_interact}{} |
| 131 | +Multithreaded version of \method{interact}. |
| 132 | +\end{methoddesc} |
| 133 | + |
| 134 | +\begin{methoddesc}[Telnet]{expect}{list, timeout=None} |
| 135 | +Read until one from a list of a regular expressions matches. |
| 136 | + |
| 137 | +The first argument is a list of regular expressions, either |
| 138 | +compiled (\class{re.RegexObject} instances) or uncompiled (strings). |
| 139 | +The optional second argument is a timeout, in seconds; default |
| 140 | +is no timeout. |
| 141 | + |
| 142 | +Return a tuple of three items: the index in the list of the |
| 143 | +first regular expression that matches; the match object |
| 144 | +returned; and the text read up till and including the match. |
| 145 | + |
| 146 | +If end of file is found and no text was read, raise |
| 147 | +\exception{EOFError}. Otherwise, when nothing matches, return |
| 148 | +\code{(-1, None, \var{text})} where \var{text} is the text received so |
| 149 | +far (may be the empty string if a timeout happened). |
| 150 | + |
| 151 | +If a regular expression ends with a greedy match (e.g. \regexp{.*}) |
| 152 | +or if more than one expression can match the same input, the |
| 153 | +results are undeterministic, and may depend on the I/O timing. |
| 154 | +\end{methoddesc} |
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