- Field types
- I1, I2, I4 -- bigendian integers
- R, R[L] - 16 bit RRTYPE, or NSEC grouped bitmap of RRTYPEs
- A, AA, AAAA - 32, 64, 128 bit address
- N - regular and compressed domain name, mailbox domain name
- S, S[M], S[X] - string, multiple strings, uncounted final string
- B32/64 - base32/64
- X, X[C] - hex, hex with one byte count.
- X6, X8 - EUI48 and EUI64
- T. T6 - unix timestamp
- Z[...] - special cases
- SEE ALSO
Net::DNS::Extlang - DNS extension language
use Net::DNS::Extlang; $ext = new Net::DNS::Extlang(file => '/etc/dnsext.txt', domain => 'arpa, lang => 'en', resolver => resobj)
The Net::DNS::Extlang module reads and stores RR descriptions from files or the DNS. If file is provided, it reads descriptions from that file, otherwise it looks in <name>.rrname.<domain> and <val>.rrtype.<domain> for descriptions in the desired language.
Provide a resolver if you want other than the default resolver settings.
$ext = new Net::DNS::Extlang(file => '/etc/dnsext.txt', domain => 'arpa', lang => 'en', resolver => resobj)
Create an object corresponding to a set of extension language entries in a file or the DNS. Provide either a file or a domain argument. If you provide a domain, the lang and resolver are optional.
In addition to using its methods, you can push the object onto @INC to let it automatically create rrtype routines as required.
%rrinfo = $ext->getrr(nameornumber)
Retrieve the rr description by number (if the argument is all digits) or name (otherwise.) %rrinfo is a hash with fields mnemon, number, comment, and fields: the lines in the description stanza. Each field is a hash with entries type (field type), quals (optional qualifiers), name (optional field name), and comment.
Descriptions from a file are all loaded by new(), from the DNS are fetched as needed. If there's no description for that name or number it returns undef.
$code = $ext->compile(nameornumber) $code = $ext->compilerr($rrr)
Compile the rr description into Net::DNS::RR:<name> and return the perl code, suitable to pass to eval(). nameornumber is looked up, $rrr is an rr description such as getrr() returns.
If there's no description it returns null.
Compiled methods include:
_decode_rdata, _encode_rdata, _format_rdata, _parse_rdata, _defaults
get/set for each field named to match the field, or fieldN if the field has no name or a duplicate name. If field names match built in names or perl keywords, the get/set method name is prefixed with 'f'.
Display is unsigned integer
Display is symbolic RRTYPE or typeN, or list thereof
Display is 126.96.36.199 or xx:xx::xx
Display is a domain name. Option C means RFC1035 compression, option A means it's really a mailbox. Options only for the last field in a record: O means the name is optional.
Quoted string or strings. M and X must be last field.
Display is string. B32 is preceded in the record by a length byte. B64 is uncounted so must be last field, display can have embedded spaces.
Uncounted X must be the last field, display can contain spaces.
Display is six or eight bytes of hex with optional hyphens.
T is four bytes, T6 is six bytes. Display is number of seconds since 1970 or yyyymmddhhmmss.
Defined in the spec but not implemented
Copyright 2017 John R. Levine.
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