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.\" ========================================================================
.\"
.IX Title "Net::DNS::ZoneFile 3pm"
.TH Net::DNS::ZoneFile 3pm "2014-10-29" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Net::DNS::ZoneFile \- DNS zone file
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Net::DNS::ZoneFile;
\&
\&    $zonefile = new Net::DNS::ZoneFile( \*(Aqnamed.example\*(Aq );
\&
\&    while ( $rr = $zonefile\->read ) {
\&        $rr\->print;
\&    }
\&
\&    @zone = $zonefile\->read;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Each Net::DNS::ZoneFile object instance represents a zone file
together with any subordinate files introduced by the \f(CW$INCLUDE\fR
directive.  Zone file syntax is defined by \s-1RFC1035.\s0
.PP
A program may have multiple zone file objects, each maintaining
its own independent parser state information.
.PP
The parser supports both the \f(CW$TTL\fR directive defined by \s-1RFC2308\s0
and the \s-1BIND \f(CW$GENERATE\fR\s0 syntax extension.
.PP
All RRs in a zone file must have the same class, which may be
specified for the first \s-1RR\s0 encountered and is then propagated
automatically to all subsequent records.
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
.Vb 1
\&    $zonefile = new Net::DNS::ZoneFile( \*(Aqfilename\*(Aq, [\*(Aqexample.com\*(Aq] );
\&
\&    $handle   = new FileHandle( \*(Aqfilename\*(Aq, \*(Aq<:encoding(ISO8859\-7)\*(Aq );
\&    $zonefile = new Net::DNS::ZoneFile( $handle, [\*(Aqexample.com\*(Aq] );
.Ve
.PP
The \fInew()\fR constructor returns a Net::DNS::ZoneFile object which
represents the zone file specified in the argument list.
.PP
The specified file or file handle is open for reading and closed when
exhausted or all references to the ZoneFile object cease to exist.
.PP
The optional second argument specifies \f(CW$ORIGIN\fR for the zone file.
.PP
Character encoding is specified indirectly by creating a FileHandle
with the desired encoding layer, which is then passed as an argument
to \fInew()\fR. The specified encoding is propagated to files introduced
by \f(CW$include\fR directives.
.SS "read"
.IX Subsection "read"
.Vb 2
\&    $rr = $zonefile\->read;
\&    @rr = $zonefile\->read;
.Ve
.PP
When invoked in scalar context, \fIread()\fR returns a Net::DNS::RR object
representing the next resource record encountered in the zone file,
or undefined if end of data has been reached.
.PP
When invoked in list context, \fIread()\fR returns the list of Net::DNS::RR
objects in the order that they appear in the zone file.
.PP
Comments and blank lines are silently disregarded.
.PP
\&\f(CW$INCLUDE\fR, \f(CW$ORIGIN\fR, \f(CW$TTL\fR and \f(CW$GENERATE\fR directives are processed
transparently.
.SS "name"
.IX Subsection "name"
.Vb 1
\&    $filename = $zonefile\->name;
.Ve
.PP
Returns the name of the zone file from which RRs will be read.
\&\f(CW$INCLUDE\fR directives will cause this to differ from the filename
argument supplied when the object was created.
.SS "line"
.IX Subsection "line"
.Vb 1
\&    $line = $zonefile\->line;
.Ve
.PP
Returns the number of the last line read from the current zone file.
.SS "origin"
.IX Subsection "origin"
.Vb 1
\&    $origin = $zonefile\->origin;
.Ve
.PP
Returns the fully qualified name of the current origin within the
zone file.
.SS "ttl"
.IX Subsection "ttl"
.Vb 1
\&    $ttl = $zonefile\->ttl;
.Ve
.PP
Returns the default \s-1TTL\s0 as specified by the \f(CW$TTL\fR directive.
.SH "COMPATIBILITY WITH Net::DNS::ZoneFile 1.04"
.IX Header "COMPATIBILITY WITH Net::DNS::ZoneFile 1.04"
Applications which depended on the defunct Net::DNS::ZoneFile 1.04
\&\s-1CPAN\s0 distribution will continue to operate with minimal change using
the compatibility interface described below.
.PP
.Vb 1
\&    use Net::DNS::ZoneFile;
\&
\&    $listref = Net::DNS::ZoneFile\->read( $filename, $include_dir );
\&
\&    $listref = Net::DNS::ZoneFile\->readfh( $handle, $include_dir );
\&
\&    $listref = Net::DNS::ZoneFile\->parse(  $string, $include_dir );
\&    $listref = Net::DNS::ZoneFile\->parse( \e$string, $include_dir );
\&
\&    $_\->print for @$listref;
.Ve
.PP
The optional second argument specifies the default path for filenames.
The current working directory is used by default.
.PP
Although not available in the original implementation, the \s-1RR\s0 list can
be obtained directly by calling any of these methods in list context.
.PP
.Vb 1
\&    @rr = Net::DNS::ZoneFile\->read( $filename, $include_dir );
.Ve
.SS "read"
.IX Subsection "read"
.Vb 2
\&    $listref = Net::DNS::ZoneFile\->read( $filename, $include_dir );
\&    @rr = Net::DNS::ZoneFile\->read( $filename, $include_dir );
.Ve
.PP
\&\fIread()\fR parses the specified zone file and returns a reference to the
list of Net::DNS::RR objects representing the RRs in the file.
The return value is undefined if the zone data can not be parsed.
.PP
When called in list context, the partial result is returned if an
error is encountered by the parser.
.SS "readfh"
.IX Subsection "readfh"
.Vb 1
\&    $listref = Net::DNS::ZoneFile\->readfh( $handle, $include_dir );
.Ve
.PP
\&\fIreadfh()\fR parses data from the specified file handle and returns a
reference to the list of Net::DNS::RR objects representing the RRs
in the file.
.SS "parse"
.IX Subsection "parse"
.Vb 2
\&    $listref = Net::DNS::ZoneFile\->parse(  $string, $include_dir );
\&    $listref = Net::DNS::ZoneFile\->parse( \e$string, $include_dir );
.Ve
.PP
\&\fIparse()\fR interprets the zone file text in the argument string and
returns a reference to the list of Net::DNS::RR objects representing
the RRs.
.SH "ACKNOWLEDGEMENTS"
.IX Header "ACKNOWLEDGEMENTS"
This package is designed as an improved and compatible replacement
for Net::DNS::ZoneFile 1.04 which was created by Luis Munoz in 2002
as a separate \s-1CPAN\s0 module.
.PP
The present implementation is the result of an agreement to merge our
two different approaches into one package integrated into Net::DNS.
The contribution of Luis Munoz is gratefully acknowledged.
.PP
Thanks are also due to Willem Toorop for his constructive criticism
of the initial version and invaluable assistance during testing.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c)2011\-2012 Dick Franks
.PP
All rights reserved.
.PP
This program is free software; you may redistribute it and/or
modify it under the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
perl, Net::DNS, Net::DNS::RR, \s-1RFC1035\s0 Section 5.1,
\&\s-1RFC2308, BIND 9\s0 Administrator Reference Manual