1Net::LibIDN2(3) User Contributed Perl Documentation Net::LibIDN2(3)
2
6 Net::LibIDN2 - Perl bindings for GNU Libidn2
7
9 use Net::LibIDN2 ':all';
10 idn2_lookup_u8(Encode::encode_utf8("m\N{U+00FC}\N{U+00DF}li.de"))
12 eq 'xn--mli-5ka8l.de';
13 idn2_register_u8(
15 Encode::encode_utf8("m\N{U+00FC}\N{U+00DF}li"),
16 "xn--mli-5ka8l"
17 ) eq 'xn--mli-5ka8l';
18 Encode::decode_utf8(idn2_to_unicode_88("xn--mli-5ka8l.de"))
20 eq "m\N{U+00FC}\N{U+00DF}li"
21
23 Provides bindings for GNU Libidn2, a C library for handling
24 internationalized domain names based on IDNA 2008, Punycode and TR46.
25 Functions
27 Net::LibIDN2::idn2_lookup_u8($src [, $flags [, $rc]]);
28 Alternative name idn2_to_ascii_8.
29 Perform IDNA2008 lookup string conversion on domain name $src, as
31 described in section 5 of RFC 5891. Note that the input string must
32 be encoded in UTF-8 and be in Unicode NFC form.
33 Pass IDN2_NFC_INPUT in $flags to convert input to NFC form before
35 further processing. IDN2_TRANSITIONAL and IDN2_NONTRANSITIONAL do
36 already imply IDN2_NFC_INPUT. Pass IDN2_ALABEL_ROUNDTRIP in flags
37 to convert any input A-labels to U-labels and perform additional
38 testing (not yet implemented). Pass IDN2_TRANSITIONAL to enable
39 Unicode TR46 transitional processing, and IDN2_NONTRANSITIONAL to
40 enable Unicode TR46 non-transitional processing. Pass IDN2_NO_TR46
41 (available since Libidn 2.0.5) to disable any TR46 transitional or
42 non-transitional processing. Multiple flags may be specified by
43 binary or:ing them together, for example IDN2_NFC_INPUT |
44 IDN2_ALABEL_ROUNDTRIP.
45 If linked to library GNU Libidn version > 2.0.3:
47 IDN2_USE_STD3_ASCII_RULES disabled by default. Previously we were
48 eliminating non-STD3 characters from domain strings such as
49 _443._tcp.example.com, or IPs 1.2.3.4/24 provided to libidn2
50 functions. That was an unexpected regression for applications
51 switching from libidn and thus it is no longer applied by default.
52 Use IDN2_USE_STD3_ASCII_RULES to enable that behavior again.
53 If linked to library GNU Libidn version >= 2.0.5: IDNA2008 behavior
55 amended by TR46 (non-transitional) is default.
56 On error, returns undef. If a scalar variable is provided in $rc,
58 returns the internal libidn2 C library result code as well.
59 Net::LibIDN2::idn2_lookup_ul($src [, $flags [, $rc]]);
61 Alternative name idn2_to_ascii_l.
62 Similar to function "idn2_lookup_u8" but $src is assumed to be
64 encoded in the locale's default coding system, and will be
65 transcoded to UTF-8 and NFC normalized before returning the result.
66 Net::LibIDN2::idn2_register_u8($ulabel [, $alabel, [$flags, [$rc]]]);
68 Perform IDNA2008 register string conversion on domain label $ulabel
69 and $alabel, as described in section 4 of RFC 5891. Note that the
70 input ulabel must be encoded in UTF-8 and be in Unicode NFC form.
71 Pass IDN2_NFC_INPUT in $flags to convert input $ulabel to NFC form
73 before further processing.
74 It is recommended to supply both $ulabel and $alabel for better
76 error checking, but supplying just one of them will work. Passing
77 in only $alabel is better than only $ulabel. See RFC 5891 section 4
78 for more information.
79 On error, returns undef. If a scalar variable is provided in $rc,
81 returns the internal libidn2 C library result code as well.
82 Net::LibIDN2::idn2_register_u8($ulabel [, $alabel, [$flags, [$rc]]]);
84 Similar to function "idn2_register_ul" but $ulabel is assumed to be
85 encoded in the locale's default coding system, and will be
86 transcoded to UTF-8 and NFC normalized before returning the result.
87 Net::LibIDN2::idn2_to_unicode_88($input, [$flags, [$rc]]);
89 Converts a possibly ACE encoded domain name in UTF-8 format into a
90 an UTF-8 encoded string (punycode decoding).
91 On error, returns undef. If a scalar variable is provided in $rc,
93 returns the internal libidn2 C library result code as well.
94 Net::LibIDN2::idn2_to_unicode_8l($input, [$flags, [$rc]]);
96 Similar to function "idn2_to_unicode_88" but the return value is
97 encoded in the locale's default coding system.
98 Net::LibIDN2::idn2_to_unicode_ll($input, [$flags, [$rc]]);
100 Similar to function "idn2_to_unicode_8l" but $input is also assumed
101 to be encoded in the locale's default coding system.
102 Net::LibIDN2::idn2_strerror($rc);
104 Convert internal libidn2 error code $rc to a humanly readable
105 string.
106 Net::LibIDN2::idn2_strerror_name($rc);
108 Convert internal libidn2 error code $rc to a string corresponding
109 to internal header file symbols names like IDN2_MALLOC.
110 Net::LibIDN2::id2n_check_version([$req_version])
112 Checks that the version of the underlying IDN2 C library is at
113 minimum the one given as a string in $req_version and if that is
114 the case returns the actual version string of the underlying C
115 library or undef if the condition is not met. If no parameter is
116 passed to this function no check is done and only the version
117 string is returned.
118 See IDN2_VERSION for a suitable $req_version string, it corresponds
120 to the idn2.h C header file version at compile time of this Perl
121 module. Normally these two version numbers match, but if you
122 compiled this Perl module against an older libidn2 and then run it
123 with a newer libidn2 shared library they will be different.
124 Constants
126 IDN2_VERSION
127 Pre-processor symbol with a string that describe the C header file
128 version number at compile time of this Perl module. Used together
129 with idn2_check_version() to verify header file and run-time
130 library consistency.
131 IDN2_VERSION_NUMBER
133 Pre-processor symbol with a hexadecimal value describing the C
134 header file version number at compile time of this Perl module. For
135 example, when the header version is 1.2.4711 this symbol will have
136 the value 0x01021267. The last four digits are used to enumerate
137 development snapshots, but for all public releases they will be
138 0000.
139 IDN2_VERSION_MAJOR
141 Pre-processor symbol for the major version number (decimal). The
142 version scheme is major.minor.patchlevel.
143 IDN2_VERSION_MINOR
145 Pre-processor symbol for the minor version number (decimal). The
146 version scheme is major.minor.patchlevel.
147 IDN2_VERSION_PATCH
149 Pre-processor symbol for the patch level number (decimal). The
150 version scheme is major.minor.patchlevel.
151 IDN2_LABEL_MAX_LENGTH
153 Constant specifying the maximum length of a DNS label to 63
154 characters, as specified in RFC 1034.
155 IDN2_DOMAIN_MAX_LENGTH
157 Constant specifying the maximum size of the wire encoding of a DNS
158 domain to 255 characters, as specified in RFC 1034. Note that the
159 usual printed representation of a domain name is limited to 253
160 characters if it does not end with a period or 254 characters if it
161 ends with a period.
162 Result codes
164 "IDN2_OK" Successful return.
165 "IDN2_MALLOC" Memory allocation error.
166 "IDN2_NO_CODESET" Could not determine locale string encoding format.
167 "IDN2_ICONV_FAIL" Could not transcode locale string to UTF-8.
168 "IDN2_ENCODING_ERROR" Unicode data encoding error.
169 "IDN2_NFC" Error normalizing string.
170 "IDN2_PUNYCODE_BAD_INPUT" Punycode invalid input.
171 "IDN2_PUNYCODE_BIG_OUTPUT" Punycode output buffer too small.
172 "IDN2_PUNYCODE_OVERFLOW" Punycode conversion would overflow.
173 "IDN2_TOO_BIG_DOMAIN" Domain name longer than 255 characters.
174 "IDN2_TOO_BIG_LABEL" Domain label longer than 63 characters.
175 "IDN2_INVALID_ALABEL" Input A-label is not valid.
176 "IDN2_UALABEL_MISMATCH" Input A-label and U-label does not match.
177 "IDN2_NOT_NFC" String is not NFC.
178 "IDN2_2HYPHEN" String has forbidden two hyphens.
179 "IDN2_HYPHEN_STARTEND" String has forbidden starting/ending hyphen.
180 "IDN2_LEADING_COMBINING" String has forbidden leading combining
181 character.
182 "IDN2_DISALLOWED" String has disallowed character.
183 "IDN2_CONTEXTJ" String has forbidden context-j character.
184 "IDN2_CONTEXTJ_NO_RULE" String has context-j character with no rull.
185 "IDN2_CONTEXTO" String has forbidden context-o character.
186 "IDN2_CONTEXTO_NO_RULE" String has context-o character with no rull.
187 "IDN2_UNASSIGNED" String has forbidden unassigned character.
188 "IDN2_BIDI" String has forbidden bi-directional properties.
189 "IDN2_DOT_IN_LABEL" Label has forbidden dot (TR46).
190 "IDN2_INVALID_TRANSITIONAL" Label has character forbidden in
191 transitional mode (TR46).
192 "IDN2_INVALID_NONTRANSITIONAL" Label has character forbidden in non-
193 transitional mode (TR46).
194
196 Thomas Jacob, https://github.com/gnuthor
197
199 perl(1), RFC 5890-5893, TR 46, https://gitlab.com/libidn/libidn2.
200perl v5.30.0 2019-07-26 Net::LibIDN2(3)