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119 lines
3.7 KiB
TeX
119 lines
3.7 KiB
TeX
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\section{Built-in Module \sectcode{macdnr}}
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\bimodindex{macdnr}
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This module provides an interface to the Macintosh Domain Name
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Resolver. It is usually used in conjunction with the \var{mactcp}
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module, to map hostnames to IP-addresses. It may not be available in
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all Mac Python versions.
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The \code{macdnr} module defines the following functions:
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\renewcommand{\indexsubitem}{(in module macdnr)}
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\begin{funcdesc}{Open}{\optional{filename}}
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Open the domain name resolver extension. If \var{filename} is given it
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should be the pathname of the extension, otherwise a default is
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used. Normally, this call is not needed since the other calls will
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open the extension automatically.
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\end{funcdesc}
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\begin{funcdesc}{Close}{}
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Close the resolver extension. Again, not needed for normal use.
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\end{funcdesc}
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\begin{funcdesc}{StrToAddr}{hostname}
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Look up the IP address for \var{hostname}. This call returns a dnr
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result object of the ``address'' variation.
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\end{funcdesc}
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\begin{funcdesc}{AddrToName}{addr}
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Do a reverse lookup on the 32-bit integer IP-address
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\var{addr}. Returns a dnr result object of the ``address'' variation.
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\end{funcdesc}
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\begin{funcdesc}{AddrToStr}{addr}
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Convert the 32-bit integer IP-address \var{addr} to a dotted-decimal
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string. Returns the string.
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\end{funcdesc}
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\begin{funcdesc}{HInfo}{hostname}
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Query the nameservers for a \code{HInfo} record for host
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\var{hostname}. These records contain hardware and software
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information about the machine in question (if they are available in
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the first place). Returns a dnr result object of the ``hinfo''
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variety.
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\end{funcdesc}
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\begin{funcdesc}{MXInfo}{domain}
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Query the nameservers for a mail exchanger for \var{domain}. This is
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the hostname of a host willing to accept SMTP mail for the given
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domain. Returns a dnr result object of the ``mx'' variety.
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\end{funcdesc}
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\subsection{dnr result object}
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Since the DNR calls all execute asynchronously you do not get the
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results back immediately. Instead, you get a dnr result object. You
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can check this object to see whether the query is complete, and access
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its attributes to obtain the information when it is.
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Alternatively, you can also reference the result attributes directly,
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this will result in an implicit wait for the query to complete.
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The \var{rtnCode} and \var{cname} attributes are always available, the
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others depend on the type of query (address, hinfo or mx).
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\renewcommand{\indexsubitem}{(dnr result object method)}
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% Add args, as in {arg1\, arg2 \optional{\, arg3}}
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\begin{funcdesc}{wait}{}
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Wait for the query to complete.
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\end{funcdesc}
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% Add args, as in {arg1\, arg2 \optional{\, arg3}}
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\begin{funcdesc}{isdone}{}
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Return 1 if the query is complete.
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\end{funcdesc}
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\renewcommand{\indexsubitem}{(dnr result object attribute)}
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\begin{datadesc}{rtnCode}
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The error code returned by the query.
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\end{datadesc}
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\begin{datadesc}{cname}
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The canonical name of the host that was queried.
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\end{datadesc}
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\begin{datadesc}{ip0}
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\dataline{ip1}
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\dataline{ip2}
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\dataline{ip3}
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At most four integer IP addresses for this host. Unused entries are
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zero. Valid only for address queries.
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\end{datadesc}
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\begin{datadesc}{cpuType}
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\dataline{osType}
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Textual strings giving the machine type an OS name. Valid for hinfo
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queries.
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\end{datadesc}
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\begin{datadesc}{exchange}
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The name of a mail-exchanger host. Valid for mx queries.
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\end{datadesc}
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\begin{datadesc}{preference}
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The preference of this mx record. Not too useful, since the Macintosh
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will only return a single mx record. Mx queries only.
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\end{datadesc}
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The simplest way to use the module to convert names to dotted-decimal
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strings, without worrying about idle time, etc:
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\begin{verbatim}
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>>> def gethostname(name):
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... import macdnr
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... dnrr = macdnr.StrToAddr(name)
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... return macdnr.AddrToStr(dnrr.ip0)
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\end{verbatim}
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