Net::LibIDN - Perl bindings for GNU Libidn

  use Net::LibIDN ':all';

  idn_to_ascii("Räksmörgås.Josefßon.ORG") eq
    idn_to_ascii(idn_to_unicode("xn--rksmrgs-5wao1o.josefsson.org"));

  idn_prep_name("LibÜDN") eq "libüdn";

  idn_punycode_encode("kistenmöhre") eq
    idn_punycode_encode(idn_punycode_decode("kistenmhre-kcb"));

  my $errpos;
  tld_check("mèrle.se", $errpos) eq undef;
    $errpos == 1;

  tld_get("mainbase.mars") eq "mars";

  my $hashref = Net::LibIDN::tld_get_table("de");

  print "$hashref->{version}\n";
  foreach (@{$hashref->{valid}})
  {
    print "Unicode range from ".$_->{start}." to ".$_->{end}."\n";
  }

Provides bindings for GNU Libidn, a C library for handling Internationalized Domain Names according to IDNA (RFC 3490), in a way very much inspired by Turbo Fredriksson's PHP-IDN.

Net::LibIDN::idn_to_ascii($clear_hostname, [$charset, [$flags]]);

Converts $clear_hostname which might contain characters outside the range allowed in DNS names, to IDNA ACE. If $charset is specified, treats string as being encoded in it, otherwise assumes it is ISO-8859-1 encoded. If flag IDNA_ALLOW_UNASSIGNED is set in $flags, accepts also unassigned Unicode characters, if IDNA_USE_STD3_ASCII_RULES is set, accepts only ASCII LDH characters (letter-digit-hyphen). Flags can be combined with ||. Returns result of conversion or undef on error.

Net::LibIDN::idn_to_unicode($idn_hostname, [$charset, [$flags]]);

Converts ASCII $idn_hostname, which might be IDNA ACE encoded, into the decoded form in $charset or ISO-8859-1. Flags are interpreted as above. Returns result of conversion or undef on error.

Net::LibIDN::idn_punycode_encode($string, [$charset]);

Encodes $string into punycode (RFC 3492). If $charset is present, treats $string as being in $charset, otherwise uses ISO-8859-1. Returns result of conversion or undef on error.

Net::LibIDN::idn_punycode_decode($string, [$charset]);

Decodes $string from punycode (RFC 3492). If $charset is present, result is converted to $charset, otherwise it is converted to ISO-8859-1. Returns result of conversion or undef on error.

Net::LibIDN::idn_prep_name($string, [$charset]);

Net::LibIDN::idn_prep_kerberos5($string, [$charset]);

Net::LibIDN::idn_prep_node($string, [$charset]);

Net::LibIDN::idn_prep_resource($string, [$charset]);

Net::LibIDN::idn_prep_plain($string, [$charset]);

Net::LibIDN::idn_prep_trace($string, [$charset]);

Net::LibIDN::idn_prep_sasl($string, [$charset]);

Net::LibIDN::idn_prep_iscsi($string, [$charset]);

Performs stringprep (RFC 3454) on CW$string according to the named profile (e.g. *_name -> nameprep (RFC 3491)). If $charset is present, converts from and to this charset before and after the operation respectively. Returns result string, or undef on error.

Net::LibIDN::tdl_check($string, $errpos, [$charset, [$tld]]);

Checks whether or not $string conforms to the restrictions on the sets of valid characters defined by TLD authorities around the World. Treats $string as a hostname if $tld is not present, determining the TLD from the hostname. If $tld is present, uses the restrictions defined by the parties responsible for TLD $tld. $charset may be used to specify the character set the $string is in. Should an invalid character be detected, returns 0 and the 0-based position of the offending character in $errpos. In case of other failure conditions, $errpos is not touched, and undef is returned. Should $string conform to the TLD restrictions, 1 is returned.

Net::LibIDN::tld_get($hostname);

Returns top level domain of $hostname, or undef if an error occurs or if no top level domain was found.

Net::LibIDN::tld_get_table($tld);

Retrieves a hash reference with the TLD restriction info of given TLD $tld, or undef if $tld is not found. The hash ref contains the following fields:

* $h->{name} ... name of TLD

* $h->{version} ... version string of this restriction table

* $h->{nvalid} ... number of Unicode intervals

* $h->{valid} ... [ {start => number, end => number}, ...] ... Unicode intervals

Thomas Jacob, http://internet24.de

perl(1), RFC 3454, RFC 3490-3492, http://www.gnu.org/software/libidn.