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Ident protocol implementation.

@author: Jean-Paul Calderone
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IdentErrorcBseZdZdZdZRS(s;
    Can't determine connection owner; reason unknown.
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    The connection specified by the port pair is not currently in use or
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RR(((s;/usr/lib/python2.7/dist-packages/twisted/protocols/ident.pyR!stInvalidPortcBseZdZdZRS(s
    Either the local or foreign port was improperly specified. This should
    be returned if either or both of the port ids were out of range (TCP
    port numbers are from 1-65535), negative integers, reals or in any
    fashion not recognized as a non-negative integer.
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    The server was able to identify the user of this port, but the
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RR(((s;/usr/lib/python2.7/dist-packages/twisted/protocols/ident.pyR3stIdentServercBsDeZdZdZdZdZdZdZdZRS(s
    The Identification Protocol (a.k.a., "ident", a.k.a., "the Ident
    Protocol") provides a means to determine the identity of a user of a
    particular TCP connection. Given a TCP port number pair, it returns a
    character string which identifies the owner of that connection on the
    server's system.

    Server authors should subclass this class and override the lookup method.
    The default implementation returns an UNKNOWN-ERROR response for every
    query.
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        Called when a valid query is received to look up and deliver the
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        @param portOnServer: The server port from the query.
        @param portOnClient: The client port from the query.
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cCs-|\}}|jd||||fdS(Ns%d, %d : USERID : %s : %s(tsendLine(Rt.1tsporttcporttsysNametuserId((s;/usr/lib/python2.7/dist-packages/twisted/protocols/ident.pyR)ks	cCsc|jtr/|jd|||jfn0tj||jd||t|jfdS(Ns%d, %d : ERROR : %s(tcheckRR-tvalueRterr(RRR/R0((s;/usr/lib/python2.7/dist-packages/twisted/protocols/ident.pyRns 
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        Return value should be a two-tuple of system name and username.
        Acceptable values for the system name may be found online at::

            U{http://www.iana.org/assignments/operating-system-names}

        This method may also raise any IdentError subclass (or IdentError
        itself) to indicate user information will not be provided for the
        given query.

        A Deferred may also be returned.

        @param serverAddress: A two-tuple representing the server endpoint
        of the address being queried.  The first element is a string holding
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        representing the port.

        @param clientAddress: Like L{serverAddress}, but represents the
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				tIdentClientcBsGeZeeeefZdZdZdZ	dZ
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cCs|js tjd|fnd|jjd\}}}|j|||jr|jd|jdd|jddfndS(NsUnexpected server response: %ris%d, %dii(R[Rtmsgtpopt
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