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.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" Net::DNS::Resolver::Programmable \- programmable DNS resolver class for offline emulation of DNS .SH "VERSION" .IX Header "VERSION" 0.003 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 2 \& use Net::DNS::Resolver::Programmable; \& use Net::DNS::RR; \& \& my $resolver = Net::DNS::Resolver::Programmable\->new( \& records => { \& \*(Aqexample.com\*(Aq => [ \& Net::DNS::RR\->new(\*(Aqexample.com. NS ns.example.org.\*(Aq), \& Net::DNS::RR\->new(\*(Aqexample.com. A 192.168.0.1\*(Aq) \& ], \& \*(Aqns.example.org\*(Aq => [ \& Net::DNS::RR\->new(\*(Aqns.example.org. A 192.168.1.1\*(Aq) \& ] \& }, \& \& resolver_code => sub { \& my ($domain, $rr_type, $class) = @_; \& ... \& return ($result, $aa, @rrs); \& } \& ); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBNet::DNS::Resolver::Programmable\fR is a \fBNet::DNS::Resolver\fR descendant class that allows a virtual \s-1DNS\s0 to be emulated instead of querying the real \&\s-1DNS. A\s0 set of static \s-1DNS\s0 records may be supplied, or arbitrary code may be specified as a means for retrieving \s-1DNS\s0 records, or even generating them on the fly. .SS "Constructor" .IX Subsection "Constructor" The following constructor is provided: .IP "\fBnew(%options)\fR: returns \fINet::DNS::Resolver::Programmable\fR" 4 .IX Item "new(%options): returns Net::DNS::Resolver::Programmable" Creates a new programmed \s-1DNS\s0 resolver object. .Sp \&\f(CW%options\fR is a list of key/value pairs representing any of the following options: .RS 4 .IP "\fBrecords\fR" 4 .IX Item "records" A reference to a hash of arrays containing a static set of \fINet::DNS::RR\fR objects. The hash entries must be indexed by fully qualified domain names (lower-case, without any trailing dots), and the entries themselves must be arrays of the \s-1RR\s0 objects pertaining to these domain names. For example: .Sp .Vb 12 \& records => { \& \*(Aqexample.com\*(Aq => [ \& Net::DNS::RR\->new(\*(Aqexample.com. NS ns.example.org.\*(Aq), \& Net::DNS::RR\->new(\*(Aqexample.com. A 192.168.0.1\*(Aq) \& ], \& \*(Aqwww.example.com\*(Aq => [ \& Net::DNS::RR\->new(\*(Aqwww.example.com. A 192.168.0.2\*(Aq) \& ], \& \*(Aqns.example.org\*(Aq => [ \& Net::DNS::RR\->new(\*(Aqns.example.org. A 192.168.1.1\*(Aq) \& ] \& } .Ve .Sp If this option is specified, the resolver retrieves requested RRs from this data structure. .IP "\fBresolver_code\fR" 4 .IX Item "resolver_code" A code reference used as a call-back for dynamically retrieving requested RRs. .Sp The code must take the following query parameters as arguments: the \fIdomain\fR, \&\fI\s-1RR\s0 type\fR, and \fIclass\fR. .Sp It must return a list composed of: the response's \fI\s-1RCODE\s0\fR (by name, as returned by Net::DNS::Header\->rcode), the \&\fI\f(CI\*(C`aa\*(C'\fI (authoritative answer) flag\fR (\fIboolean\fR, use \fBundef\fR if you don't care), and the \fINet::DNS::RR answer objects\fR. If an error string is returned instead of a valid \s-1RCODE,\s0 a \fINet::DNS::Packet\fR object is not constructed but an error condition for the resolver is signaled instead. .Sp For example: .Sp .Vb 5 \& resolver_code => sub { \& my ($domain, $rr_type, $class) = @_; \& ... \& return ($result, $aa, @rrs); \& } .Ve .Sp If both this and the \f(CW\*(C`records\*(C'\fR option are specified, then statically programmed records are used in addition to any that are returned by the configured resolver code. .IP "\fBdefnames\fR" 4 .IX Item "defnames" .PD 0 .IP "\fBdnsrch\fR" 4 .IX Item "dnsrch" .IP "\fBdomain\fR" 4 .IX Item "domain" .IP "\fBsearchlist\fR" 4 .IX Item "searchlist" .IP "\fBdebug\fR" 4 .IX Item "debug" .PD These Net::DNS::Resolver options are also meaningful with Net::DNS::Resolver::Programmable. See Net::DNS::Resolver for their descriptions. .RE .RS 4 .RE .SS "Instance methods" .IX Subsection "Instance methods" The following instance methods of \fINet::DNS::Resolver\fR are also supported by \&\fINet::DNS::Resolver::Programmable\fR: .IP "\fBsearch\fR: returns \fINet::DNS::Packet\fR" 4 .IX Item "search: returns Net::DNS::Packet" .PD 0 .IP "\fBquery\fR: returns \fINet::DNS::Packet\fR" 4 .IX Item "query: returns Net::DNS::Packet" .IP "\fBsend\fR: returns \fINet::DNS::Packet\fR" 4 .IX Item "send: returns Net::DNS::Packet" .PD Performs an offline \s-1DNS\s0 query, using the statically programmed \s-1DNS\s0 RRs and/or the configured dynamic resolver code. See the \*(L"new\*(R" constructor's \f(CW\*(C`records\*(C'\fR and \f(CW\*(C`resolver_code\*(C'\fR options. See the descriptions of search, query, and send for details about the calling syntax of these methods. .IP "\fBprint\fR" 4 .IX Item "print" .PD 0 .IP "\fBstring\fR: returns \fIstring\fR" 4 .IX Item "string: returns string" .IP "\fBsearchlist\fR: returns \fIlist\fR of \fIstring\fR" 4 .IX Item "searchlist: returns list of string" .IP "\fBdefnames\fR: returns \fIboolean\fR" 4 .IX Item "defnames: returns boolean" .IP "\fBdnsrch\fR: returns \fIboolean\fR" 4 .IX Item "dnsrch: returns boolean" .IP "\fBdebug\fR: returns \fIboolean\fR" 4 .IX Item "debug: returns boolean" .IP "\fBerrorstring\fR: returns \fIstring\fR" 4 .IX Item "errorstring: returns string" .IP "\fBanswerfrom\fR: returns \fIstring\fR" 4 .IX Item "answerfrom: returns string" .IP "\fBanswersize\fR: returns \fIinteger\fR" 4 .IX Item "answersize: returns integer" .PD See \*(L"\s-1METHODS\*(R"\s0 in Net::DNS::Resolver. .PP Currently the following methods of \fINet::DNS::Resolver\fR are \fBnot\fR supported: \&\fBaxfr\fR, \fBaxfr_start\fR, \fBaxfr_next\fR, \fBnameservers\fR, \fBport\fR, \fBsrcport\fR, \&\fBsrcaddr\fR, \fBbgsend\fR, \fBbgread\fR, \fBbgisready\fR, \fBtsig\fR, \fBretrans\fR, \fBretry\fR, \&\fBrecurse\fR, \fBusevc\fR, \fBtcp_timeout\fR, \fBudp_timeout\fR, \fBpersistent_tcp\fR, \&\fBpersistent_udp\fR, \fBigntc\fR, \fBdnssec\fR, \fBcdflag\fR, \fBudppacketsize\fR. The effects of using these on \fINet::DNS::Resolver::Programmable\fR objects are undefined. .SH "SEE ALSO" .IX Header "SEE ALSO" Net::DNS::Resolver .PP For availability, support, and license information, see the \s-1README\s0 file included with Net::DNS::Resolver::Programmable. .SH "AUTHORS" .IX Header "AUTHORS" Julian Mehnle <julian@mehnle.net>