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01859b1c | 1 | /* idna.c Convert to or from IDN strings. |
aff2453d | 2 | * Copyright (C) 2002, 2003, 2004, 2011 Simon Josefsson |
01859b1c UD |
3 | * |
4 | * This file is part of GNU Libidn. | |
5 | * | |
6 | * GNU Libidn is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * GNU Libidn is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 17 | * License along with GNU Libidn; if not, see <http://www.gnu.org/licenses/>. |
01859b1c UD |
18 | */ |
19 | ||
20 | #if HAVE_CONFIG_H | |
21 | # include "config.h" | |
22 | #endif | |
23 | ||
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <stringprep.h> | |
27 | #include <punycode.h> | |
e054f494 | 28 | #include <stdint.h> |
01859b1c UD |
29 | |
30 | #include "idna.h" | |
31 | ||
32 | #define DOTP(c) ((c) == 0x002E || (c) == 0x3002 || \ | |
33 | (c) == 0xFF0E || (c) == 0xFF61) | |
34 | ||
35 | /* Core functions */ | |
36 | ||
37 | /** | |
38 | * idna_to_ascii_4i | |
39 | * @in: input array with unicode code points. | |
40 | * @inlen: length of input array with unicode code points. | |
41 | * @out: output zero terminated string that must have room for at | |
42 | * least 63 characters plus the terminating zero. | |
43 | * @flags: IDNA flags, e.g. IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES. | |
44 | * | |
45 | * The ToASCII operation takes a sequence of Unicode code points that make | |
46 | * up one label and transforms it into a sequence of code points in the | |
47 | * ASCII range (0..7F). If ToASCII succeeds, the original sequence and the | |
48 | * resulting sequence are equivalent labels. | |
49 | * | |
50 | * It is important to note that the ToASCII operation can fail. ToASCII | |
51 | * fails if any step of it fails. If any step of the ToASCII operation | |
52 | * fails on any label in a domain name, that domain name MUST NOT be used | |
53 | * as an internationalized domain name. The method for deadling with this | |
54 | * failure is application-specific. | |
55 | * | |
56 | * The inputs to ToASCII are a sequence of code points, the AllowUnassigned | |
57 | * flag, and the UseSTD3ASCIIRules flag. The output of ToASCII is either a | |
58 | * sequence of ASCII code points or a failure condition. | |
59 | * | |
60 | * ToASCII never alters a sequence of code points that are all in the ASCII | |
61 | * range to begin with (although it could fail). Applying the ToASCII | |
62 | * operation multiple times has exactly the same effect as applying it just | |
63 | * once. | |
64 | * | |
65 | * Return value: Returns 0 on success, or an error code. | |
66 | */ | |
67 | int | |
68 | idna_to_ascii_4i (const uint32_t * in, size_t inlen, char *out, int flags) | |
69 | { | |
70 | size_t len, outlen; | |
71 | uint32_t *src; /* XXX don't need to copy data? */ | |
72 | int rc; | |
73 | ||
74 | /* | |
75 | * ToASCII consists of the following steps: | |
76 | * | |
77 | * 1. If all code points in the sequence are in the ASCII range (0..7F) | |
78 | * then skip to step 3. | |
79 | */ | |
80 | ||
81 | { | |
82 | size_t i; | |
83 | int inasciirange; | |
84 | ||
85 | inasciirange = 1; | |
86 | for (i = 0; i < inlen; i++) | |
87 | if (in[i] > 0x7F) | |
88 | inasciirange = 0; | |
89 | if (inasciirange) | |
90 | { | |
91 | src = malloc (sizeof (in[0]) * (inlen + 1)); | |
92 | if (src == NULL) | |
93 | return IDNA_MALLOC_ERROR; | |
94 | ||
95 | memcpy (src, in, sizeof (in[0]) * inlen); | |
96 | src[inlen] = 0; | |
97 | ||
98 | goto step3; | |
99 | } | |
100 | } | |
101 | ||
102 | /* | |
103 | * 2. Perform the steps specified in [NAMEPREP] and fail if there is | |
104 | * an error. The AllowUnassigned flag is used in [NAMEPREP]. | |
105 | */ | |
106 | ||
107 | { | |
108 | char *p; | |
109 | ||
110 | p = stringprep_ucs4_to_utf8 (in, inlen, NULL, NULL); | |
111 | if (p == NULL) | |
112 | return IDNA_MALLOC_ERROR; | |
113 | ||
114 | len = strlen (p); | |
115 | do | |
116 | { | |
f6d77b20 UD |
117 | char *newp; |
118 | ||
01859b1c | 119 | len = 2 * len + 10; /* XXX better guess? */ |
f6d77b20 UD |
120 | newp = realloc (p, len); |
121 | if (newp == NULL) | |
9be31a51 UD |
122 | { |
123 | free (p); | |
124 | return IDNA_MALLOC_ERROR; | |
125 | } | |
126 | p = newp; | |
01859b1c UD |
127 | |
128 | if (flags & IDNA_ALLOW_UNASSIGNED) | |
129 | rc = stringprep_nameprep (p, len); | |
130 | else | |
131 | rc = stringprep_nameprep_no_unassigned (p, len); | |
132 | } | |
133 | while (rc == STRINGPREP_TOO_SMALL_BUFFER); | |
134 | ||
135 | if (rc != STRINGPREP_OK) | |
136 | { | |
137 | free (p); | |
138 | return IDNA_STRINGPREP_ERROR; | |
139 | } | |
140 | ||
141 | src = stringprep_utf8_to_ucs4 (p, -1, NULL); | |
142 | ||
143 | free (p); | |
144 | } | |
145 | ||
146 | step3: | |
147 | /* | |
148 | * 3. If the UseSTD3ASCIIRules flag is set, then perform these checks: | |
149 | * | |
150 | * (a) Verify the absence of non-LDH ASCII code points; that is, | |
151 | * the absence of 0..2C, 2E..2F, 3A..40, 5B..60, and 7B..7F. | |
152 | * | |
153 | * (b) Verify the absence of leading and trailing hyphen-minus; | |
154 | * that is, the absence of U+002D at the beginning and end of | |
155 | * the sequence. | |
156 | */ | |
157 | ||
158 | if (flags & IDNA_USE_STD3_ASCII_RULES) | |
159 | { | |
160 | size_t i; | |
161 | ||
162 | for (i = 0; src[i]; i++) | |
163 | if (src[i] <= 0x2C || src[i] == 0x2E || src[i] == 0x2F || | |
164 | (src[i] >= 0x3A && src[i] <= 0x40) || | |
165 | (src[i] >= 0x5B && src[i] <= 0x60) || | |
166 | (src[i] >= 0x7B && src[i] <= 0x7F)) | |
167 | { | |
168 | free (src); | |
169 | return IDNA_CONTAINS_NON_LDH; | |
170 | } | |
171 | ||
172 | if (src[0] == 0x002D || (i > 0 && src[i - 1] == 0x002D)) | |
173 | { | |
174 | free (src); | |
175 | return IDNA_CONTAINS_MINUS; | |
176 | } | |
177 | } | |
178 | ||
179 | /* | |
180 | * 4. If all code points in the sequence are in the ASCII range | |
181 | * (0..7F), then skip to step 8. | |
182 | */ | |
183 | ||
184 | { | |
185 | size_t i; | |
186 | int inasciirange; | |
187 | ||
188 | inasciirange = 1; | |
189 | for (i = 0; src[i]; i++) | |
190 | { | |
191 | if (src[i] > 0x7F) | |
192 | inasciirange = 0; | |
193 | /* copy string to output buffer if we are about to skip to step8 */ | |
194 | if (i < 64) | |
195 | out[i] = src[i]; | |
196 | } | |
197 | if (i < 64) | |
198 | out[i] = '\0'; | |
199 | if (inasciirange) | |
200 | goto step8; | |
201 | } | |
202 | ||
203 | /* | |
204 | * 5. Verify that the sequence does NOT begin with the ACE prefix. | |
205 | * | |
206 | */ | |
207 | ||
208 | { | |
209 | size_t i; | |
210 | int match; | |
211 | ||
212 | match = 1; | |
213 | for (i = 0; match && i < strlen (IDNA_ACE_PREFIX); i++) | |
214 | if (((uint32_t) IDNA_ACE_PREFIX[i] & 0xFF) != src[i]) | |
215 | match = 0; | |
216 | if (match) | |
217 | { | |
218 | free (src); | |
219 | return IDNA_CONTAINS_ACE_PREFIX; | |
220 | } | |
221 | } | |
222 | ||
223 | /* | |
224 | * 6. Encode the sequence using the encoding algorithm in [PUNYCODE] | |
225 | * and fail if there is an error. | |
226 | */ | |
227 | for (len = 0; src[len]; len++) | |
228 | ; | |
229 | src[len] = '\0'; | |
230 | outlen = 63 - strlen (IDNA_ACE_PREFIX); | |
231 | rc = punycode_encode (len, src, NULL, | |
232 | &outlen, &out[strlen (IDNA_ACE_PREFIX)]); | |
233 | if (rc != PUNYCODE_SUCCESS) | |
234 | { | |
235 | free (src); | |
236 | return IDNA_PUNYCODE_ERROR; | |
237 | } | |
238 | out[strlen (IDNA_ACE_PREFIX) + outlen] = '\0'; | |
239 | ||
240 | /* | |
241 | * 7. Prepend the ACE prefix. | |
242 | */ | |
243 | ||
244 | memcpy (out, IDNA_ACE_PREFIX, strlen (IDNA_ACE_PREFIX)); | |
245 | ||
246 | /* | |
247 | * 8. Verify that the number of code points is in the range 1 to 63 | |
248 | * inclusive (0 is excluded). | |
249 | */ | |
250 | ||
251 | step8: | |
252 | free (src); | |
253 | if (strlen (out) < 1 || strlen (out) > 63) | |
254 | return IDNA_INVALID_LENGTH; | |
255 | ||
256 | return IDNA_SUCCESS; | |
257 | } | |
258 | ||
259 | /* ToUnicode(). May realloc() utf8in. */ | |
260 | static int | |
261 | idna_to_unicode_internal (char *utf8in, | |
262 | uint32_t * out, size_t * outlen, int flags) | |
263 | { | |
264 | int rc; | |
265 | char tmpout[64]; | |
266 | size_t utf8len = strlen (utf8in) + 1; | |
267 | size_t addlen = 0; | |
268 | ||
269 | /* | |
270 | * ToUnicode consists of the following steps: | |
271 | * | |
272 | * 1. If the sequence contains any code points outside the ASCII range | |
273 | * (0..7F) then proceed to step 2, otherwise skip to step 3. | |
274 | */ | |
275 | ||
276 | { | |
277 | size_t i; | |
278 | int inasciirange; | |
279 | ||
280 | inasciirange = 1; | |
281 | for (i = 0; utf8in[i]; i++) | |
282 | if (utf8in[i] & ~0x7F) | |
283 | inasciirange = 0; | |
284 | if (inasciirange) | |
285 | goto step3; | |
286 | } | |
287 | ||
288 | /* | |
289 | * 2. Perform the steps specified in [NAMEPREP] and fail if there is an | |
290 | * error. (If step 3 of ToASCII is also performed here, it will not | |
291 | * affect the overall behavior of ToUnicode, but it is not | |
292 | * necessary.) The AllowUnassigned flag is used in [NAMEPREP]. | |
293 | */ | |
294 | do | |
295 | { | |
9be31a51 UD |
296 | char *newp = realloc (utf8in, utf8len + addlen); |
297 | if (newp == NULL) | |
298 | { | |
299 | free (utf8in); | |
300 | return IDNA_MALLOC_ERROR; | |
301 | } | |
302 | utf8in = newp; | |
01859b1c UD |
303 | if (flags & IDNA_ALLOW_UNASSIGNED) |
304 | rc = stringprep_nameprep (utf8in, utf8len + addlen); | |
305 | else | |
306 | rc = stringprep_nameprep_no_unassigned (utf8in, utf8len + addlen); | |
307 | addlen += 1; | |
308 | } | |
309 | while (rc == STRINGPREP_TOO_SMALL_BUFFER); | |
310 | ||
311 | if (rc != STRINGPREP_OK) | |
9be31a51 UD |
312 | { |
313 | free (utf8in); | |
314 | return IDNA_STRINGPREP_ERROR; | |
315 | } | |
01859b1c UD |
316 | |
317 | /* 3. Verify that the sequence begins with the ACE prefix, and save a | |
318 | * copy of the sequence. | |
319 | */ | |
320 | ||
321 | step3: | |
322 | if (memcmp (IDNA_ACE_PREFIX, utf8in, strlen (IDNA_ACE_PREFIX)) != 0) | |
9be31a51 UD |
323 | { |
324 | free (utf8in); | |
325 | return IDNA_NO_ACE_PREFIX; | |
326 | } | |
01859b1c UD |
327 | |
328 | /* 4. Remove the ACE prefix. | |
329 | */ | |
330 | ||
331 | memmove (utf8in, &utf8in[strlen (IDNA_ACE_PREFIX)], | |
332 | strlen (utf8in) - strlen (IDNA_ACE_PREFIX) + 1); | |
333 | ||
334 | /* 5. Decode the sequence using the decoding algorithm in [PUNYCODE] | |
335 | * and fail if there is an error. Save a copy of the result of | |
336 | * this step. | |
337 | */ | |
338 | ||
339 | (*outlen)--; /* reserve one for the zero */ | |
340 | ||
341 | rc = punycode_decode (strlen (utf8in), utf8in, outlen, out, NULL); | |
342 | if (rc != PUNYCODE_SUCCESS) | |
9be31a51 UD |
343 | { |
344 | free (utf8in); | |
345 | return IDNA_PUNYCODE_ERROR; | |
346 | } | |
01859b1c UD |
347 | |
348 | out[*outlen] = 0; /* add zero */ | |
349 | ||
350 | /* 6. Apply ToASCII. | |
351 | */ | |
352 | ||
353 | rc = idna_to_ascii_4i (out, *outlen, tmpout, flags); | |
354 | if (rc != IDNA_SUCCESS) | |
9be31a51 UD |
355 | { |
356 | free (utf8in); | |
357 | return rc; | |
358 | } | |
01859b1c UD |
359 | |
360 | /* 7. Verify that the result of step 6 matches the saved copy from | |
361 | * step 3, using a case-insensitive ASCII comparison. | |
362 | */ | |
363 | ||
364 | if (strcasecmp (utf8in, tmpout + strlen (IDNA_ACE_PREFIX)) != 0) | |
9be31a51 UD |
365 | { |
366 | free (utf8in); | |
367 | return IDNA_ROUNDTRIP_VERIFY_ERROR; | |
368 | } | |
01859b1c UD |
369 | |
370 | /* 8. Return the saved copy from step 5. | |
371 | */ | |
372 | ||
9be31a51 | 373 | free (utf8in); |
01859b1c UD |
374 | return IDNA_SUCCESS; |
375 | } | |
376 | ||
377 | /** | |
378 | * idna_to_unicode_44i | |
379 | * @in: input array with unicode code points. | |
380 | * @inlen: length of input array with unicode code points. | |
381 | * @out: output array with unicode code points. | |
382 | * @outlen: on input, maximum size of output array with unicode code points, | |
383 | * on exit, actual size of output array with unicode code points. | |
384 | * @flags: IDNA flags, e.g. IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES. | |
385 | * | |
386 | * The ToUnicode operation takes a sequence of Unicode code points | |
387 | * that make up one label and returns a sequence of Unicode code | |
388 | * points. If the input sequence is a label in ACE form, then the | |
389 | * result is an equivalent internationalized label that is not in ACE | |
390 | * form, otherwise the original sequence is returned unaltered. | |
391 | * | |
392 | * ToUnicode never fails. If any step fails, then the original input | |
393 | * sequence is returned immediately in that step. | |
394 | * | |
395 | * The Punycode decoder can never output more code points than it | |
396 | * inputs, but Nameprep can, and therefore ToUnicode can. Note that | |
397 | * the number of octets needed to represent a sequence of code points | |
398 | * depends on the particular character encoding used. | |
399 | * | |
400 | * The inputs to ToUnicode are a sequence of code points, the | |
401 | * AllowUnassigned flag, and the UseSTD3ASCIIRules flag. The output of | |
402 | * ToUnicode is always a sequence of Unicode code points. | |
403 | * | |
404 | * Return value: Returns error condition, but it must only be used for | |
405 | * debugging purposes. The output buffer is always | |
406 | * guaranteed to contain the correct data according to | |
407 | * the specification (sans malloc induced errors). NB! | |
408 | * This means that you normally ignore the return code | |
409 | * from this function, as checking it means breaking the | |
410 | * standard. | |
411 | */ | |
412 | int | |
413 | idna_to_unicode_44i (const uint32_t * in, size_t inlen, | |
414 | uint32_t * out, size_t * outlen, int flags) | |
415 | { | |
416 | int rc; | |
417 | size_t outlensave = *outlen; | |
418 | char *p; | |
419 | ||
420 | p = stringprep_ucs4_to_utf8 (in, inlen, NULL, NULL); | |
421 | if (p == NULL) | |
422 | return IDNA_MALLOC_ERROR; | |
423 | ||
424 | rc = idna_to_unicode_internal (p, out, outlen, flags); | |
425 | if (rc != IDNA_SUCCESS) | |
426 | { | |
427 | memcpy (out, in, sizeof (in[0]) * (inlen < outlensave ? | |
428 | inlen : outlensave)); | |
429 | *outlen = inlen; | |
430 | } | |
431 | ||
9be31a51 | 432 | /* p is freed in idna_to_unicode_internal. */ |
01859b1c UD |
433 | |
434 | return rc; | |
435 | } | |
436 | ||
437 | /* Wrappers that handle several labels */ | |
438 | ||
439 | /** | |
440 | * idna_to_ascii_4z: | |
441 | * @input: zero terminated input Unicode string. | |
442 | * @output: pointer to newly allocated output string. | |
443 | * @flags: IDNA flags, e.g. IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES. | |
444 | * | |
445 | * Convert UCS-4 domain name to ASCII string. The domain name may | |
446 | * contain several labels, separated by dots. The output buffer must | |
447 | * be deallocated by the caller. | |
448 | * | |
449 | * Return value: Returns IDNA_SUCCESS on success, or error code. | |
450 | **/ | |
451 | int | |
452 | idna_to_ascii_4z (const uint32_t * input, char **output, int flags) | |
453 | { | |
454 | const uint32_t *start = input; | |
455 | const uint32_t *end = input; | |
456 | char buf[64]; | |
457 | char *out = NULL; | |
458 | int rc; | |
459 | ||
460 | /* 1) Whenever dots are used as label separators, the following | |
461 | characters MUST be recognized as dots: U+002E (full stop), | |
462 | U+3002 (ideographic full stop), U+FF0E (fullwidth full stop), | |
463 | U+FF61 (halfwidth ideographic full stop). */ | |
464 | ||
76461ded | 465 | if (input[0] == 0) |
01859b1c UD |
466 | { |
467 | /* Handle implicit zero-length root label. */ | |
468 | *output = malloc (1); | |
469 | if (!*output) | |
470 | return IDNA_MALLOC_ERROR; | |
76461ded UD |
471 | strcpy (*output, ""); |
472 | return IDNA_SUCCESS; | |
473 | } | |
474 | ||
475 | if (DOTP (input[0]) && input[1] == 0) | |
476 | { | |
477 | /* Handle explicit zero-length root label. */ | |
478 | *output = malloc (2); | |
479 | if (!*output) | |
480 | return IDNA_MALLOC_ERROR; | |
481 | strcpy (*output, "."); | |
01859b1c UD |
482 | return IDNA_SUCCESS; |
483 | } | |
484 | ||
485 | *output = NULL; | |
486 | do | |
487 | { | |
488 | end = start; | |
489 | ||
490 | for (; *end && !DOTP (*end); end++) | |
491 | ; | |
492 | ||
493 | if (*end == '\0' && start == end) | |
494 | { | |
495 | /* Handle explicit zero-length root label. */ | |
496 | buf[0] = '\0'; | |
497 | } | |
498 | else | |
499 | { | |
500 | rc = idna_to_ascii_4i (start, end - start, buf, flags); | |
501 | if (rc != IDNA_SUCCESS) | |
502 | return rc; | |
503 | } | |
504 | ||
505 | if (out) | |
506 | { | |
9be31a51 UD |
507 | char *newp = realloc (out, strlen (out) + 1 + strlen (buf) + 1); |
508 | if (!newp) | |
509 | { | |
510 | free (out); | |
511 | return IDNA_MALLOC_ERROR; | |
512 | } | |
513 | out = newp; | |
01859b1c UD |
514 | strcat (out, "."); |
515 | strcat (out, buf); | |
516 | } | |
517 | else | |
518 | { | |
519 | out = (char *) malloc (strlen (buf) + 1); | |
520 | if (!out) | |
521 | return IDNA_MALLOC_ERROR; | |
522 | strcpy (out, buf); | |
523 | } | |
524 | ||
525 | start = end + 1; | |
526 | } | |
527 | while (*end); | |
528 | ||
529 | *output = out; | |
530 | ||
531 | return IDNA_SUCCESS; | |
532 | } | |
533 | ||
534 | /** | |
535 | * idna_to_ascii_8z: | |
536 | * @input: zero terminated input UTF-8 string. | |
537 | * @output: pointer to newly allocated output string. | |
538 | * @flags: IDNA flags, e.g. IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES. | |
539 | * | |
540 | * Convert UTF-8 domain name to ASCII string. The domain name may | |
541 | * contain several labels, separated by dots. The output buffer must | |
542 | * be deallocated by the caller. | |
543 | * | |
544 | * Return value: Returns IDNA_SUCCESS on success, or error code. | |
545 | **/ | |
546 | int | |
547 | idna_to_ascii_8z (const char *input, char **output, int flags) | |
548 | { | |
549 | uint32_t *ucs4; | |
550 | size_t ucs4len; | |
551 | int rc; | |
552 | ||
553 | ucs4 = stringprep_utf8_to_ucs4 (input, -1, &ucs4len); | |
554 | if (!ucs4) | |
555 | return IDNA_ICONV_ERROR; | |
556 | ||
557 | rc = idna_to_ascii_4z (ucs4, output, flags); | |
558 | ||
559 | free (ucs4); | |
560 | ||
561 | return rc; | |
562 | ||
563 | } | |
564 | ||
565 | /** | |
566 | * idna_to_ascii_lz: | |
567 | * @input: zero terminated input UTF-8 string. | |
568 | * @output: pointer to newly allocated output string. | |
569 | * @flags: IDNA flags, e.g. IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES. | |
570 | * | |
571 | * Convert domain name in the locale's encoding to ASCII string. The | |
572 | * domain name may contain several labels, separated by dots. The | |
573 | * output buffer must be deallocated by the caller. | |
574 | * | |
575 | * Return value: Returns IDNA_SUCCESS on success, or error code. | |
576 | **/ | |
577 | int | |
578 | idna_to_ascii_lz (const char *input, char **output, int flags) | |
579 | { | |
580 | char *utf8; | |
581 | int rc; | |
582 | ||
583 | utf8 = stringprep_locale_to_utf8 (input); | |
584 | if (!utf8) | |
585 | return IDNA_ICONV_ERROR; | |
586 | ||
587 | rc = idna_to_ascii_8z (utf8, output, flags); | |
588 | ||
589 | free (utf8); | |
590 | ||
591 | return rc; | |
592 | } | |
593 | ||
594 | /** | |
595 | * idna_to_unicode_4z4z: | |
596 | * @input: zero-terminated Unicode string. | |
597 | * @output: pointer to newly allocated output Unicode string. | |
598 | * @flags: IDNA flags, e.g. IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES. | |
599 | * | |
600 | * Convert possibly ACE encoded domain name in UCS-4 format into a | |
601 | * UCS-4 string. The domain name may contain several labels, | |
602 | * separated by dots. The output buffer must be deallocated by the | |
603 | * caller. | |
604 | * | |
605 | * Return value: Returns IDNA_SUCCESS on success, or error code. | |
606 | **/ | |
607 | int | |
608 | idna_to_unicode_4z4z (const uint32_t * input, uint32_t ** output, int flags) | |
609 | { | |
610 | const uint32_t *start = input; | |
611 | const uint32_t *end = input; | |
612 | uint32_t *buf; | |
613 | size_t buflen; | |
614 | uint32_t *out = NULL; | |
615 | size_t outlen = 0; | |
01859b1c UD |
616 | |
617 | *output = NULL; | |
618 | ||
619 | do | |
620 | { | |
621 | end = start; | |
622 | ||
623 | for (; *end && !DOTP (*end); end++) | |
624 | ; | |
625 | ||
626 | buflen = end - start; | |
627 | buf = malloc (sizeof (buf[0]) * (buflen + 1)); | |
628 | if (!buf) | |
629 | return IDNA_MALLOC_ERROR; | |
630 | ||
aff2453d UD |
631 | idna_to_unicode_44i (start, end - start, buf, &buflen, flags); |
632 | /* don't check return value as per specification! */ | |
01859b1c UD |
633 | |
634 | if (out) | |
635 | { | |
9be31a51 UD |
636 | uint32_t *newp = realloc (out, |
637 | sizeof (out[0]) | |
638 | * (outlen + 1 + buflen + 1)); | |
639 | if (!newp) | |
640 | { | |
641 | free (buf); | |
642 | free (out); | |
643 | return IDNA_MALLOC_ERROR; | |
644 | } | |
645 | out = newp; | |
01859b1c UD |
646 | out[outlen++] = 0x002E; /* '.' (full stop) */ |
647 | memcpy (out + outlen, buf, sizeof (buf[0]) * buflen); | |
648 | outlen += buflen; | |
649 | out[outlen] = 0x0; | |
650 | free (buf); | |
651 | } | |
652 | else | |
653 | { | |
654 | out = buf; | |
655 | outlen = buflen; | |
656 | out[outlen] = 0x0; | |
657 | } | |
658 | ||
659 | start = end + 1; | |
660 | } | |
661 | while (*end); | |
662 | ||
663 | *output = out; | |
664 | ||
665 | return IDNA_SUCCESS; | |
666 | } | |
667 | ||
668 | /** | |
669 | * idna_to_unicode_8z4z: | |
670 | * @input: zero-terminated UTF-8 string. | |
671 | * @output: pointer to newly allocated output Unicode string. | |
672 | * @flags: IDNA flags, e.g. IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES. | |
673 | * | |
674 | * Convert possibly ACE encoded domain name in UTF-8 format into a | |
675 | * UCS-4 string. The domain name may contain several labels, | |
676 | * separated by dots. The output buffer must be deallocated by the | |
677 | * caller. | |
678 | * | |
679 | * Return value: Returns IDNA_SUCCESS on success, or error code. | |
680 | **/ | |
681 | int | |
682 | idna_to_unicode_8z4z (const char *input, uint32_t ** output, int flags) | |
683 | { | |
684 | uint32_t *ucs4; | |
685 | size_t ucs4len; | |
686 | int rc; | |
687 | ||
688 | ucs4 = stringprep_utf8_to_ucs4 (input, -1, &ucs4len); | |
689 | if (!ucs4) | |
690 | return IDNA_ICONV_ERROR; | |
691 | ||
692 | rc = idna_to_unicode_4z4z (ucs4, output, flags); | |
693 | free (ucs4); | |
694 | ||
695 | return rc; | |
696 | } | |
697 | ||
698 | /** | |
699 | * idna_to_unicode_8z8z: | |
700 | * @input: zero-terminated UTF-8 string. | |
701 | * @output: pointer to newly allocated output UTF-8 string. | |
702 | * @flags: IDNA flags, e.g. IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES. | |
703 | * | |
704 | * Convert possibly ACE encoded domain name in UTF-8 format into a | |
705 | * UTF-8 string. The domain name may contain several labels, | |
706 | * separated by dots. The output buffer must be deallocated by the | |
707 | * caller. | |
708 | * | |
709 | * Return value: Returns IDNA_SUCCESS on success, or error code. | |
710 | **/ | |
711 | int | |
712 | idna_to_unicode_8z8z (const char *input, char **output, int flags) | |
713 | { | |
714 | uint32_t *ucs4; | |
715 | int rc; | |
716 | ||
717 | rc = idna_to_unicode_8z4z (input, &ucs4, flags); | |
718 | *output = stringprep_ucs4_to_utf8 (ucs4, -1, NULL, NULL); | |
719 | free (ucs4); | |
720 | ||
721 | if (!*output) | |
722 | return IDNA_ICONV_ERROR; | |
723 | ||
724 | return rc; | |
725 | } | |
726 | ||
727 | /** | |
728 | * idna_to_unicode_8zlz: | |
729 | * @input: zero-terminated UTF-8 string. | |
730 | * @output: pointer to newly allocated output string encoded in the | |
731 | * current locale's character set. | |
732 | * @flags: IDNA flags, e.g. IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES. | |
733 | * | |
734 | * Convert possibly ACE encoded domain name in UTF-8 format into a | |
735 | * string encoded in the current locale's character set. The domain | |
736 | * name may contain several labels, separated by dots. The output | |
737 | * buffer must be deallocated by the caller. | |
738 | * | |
739 | * Return value: Returns IDNA_SUCCESS on success, or error code. | |
740 | **/ | |
741 | int | |
742 | idna_to_unicode_8zlz (const char *input, char **output, int flags) | |
743 | { | |
744 | char *utf8; | |
745 | int rc; | |
746 | ||
747 | rc = idna_to_unicode_8z8z (input, &utf8, flags); | |
748 | *output = stringprep_utf8_to_locale (utf8); | |
749 | free (utf8); | |
750 | ||
751 | if (!*output) | |
752 | return IDNA_ICONV_ERROR; | |
753 | ||
754 | return rc; | |
755 | } | |
756 | ||
757 | /** | |
758 | * idna_to_unicode_lzlz: | |
759 | * @input: zero-terminated string encoded in the current locale's | |
760 | * character set. | |
761 | * @output: pointer to newly allocated output string encoded in the | |
762 | * current locale's character set. | |
763 | * @flags: IDNA flags, e.g. IDNA_ALLOW_UNASSIGNED or IDNA_USE_STD3_ASCII_RULES. | |
764 | * | |
765 | * Convert possibly ACE encoded domain name in the locale's character | |
766 | * set into a string encoded in the current locale's character set. | |
767 | * The domain name may contain several labels, separated by dots. The | |
768 | * output buffer must be deallocated by the caller. | |
769 | * | |
770 | * Return value: Returns IDNA_SUCCESS on success, or error code. | |
771 | **/ | |
772 | int | |
773 | idna_to_unicode_lzlz (const char *input, char **output, int flags) | |
774 | { | |
775 | char *utf8; | |
776 | int rc; | |
777 | ||
778 | utf8 = stringprep_locale_to_utf8 (input); | |
779 | if (!utf8) | |
780 | return IDNA_ICONV_ERROR; | |
781 | ||
782 | rc = idna_to_unicode_8zlz (utf8, output, flags); | |
783 | free (utf8); | |
784 | ||
785 | return rc; | |
786 | } | |
787 | ||
788 | /** | |
789 | * IDNA_ACE_PREFIX | |
790 | * | |
791 | * The IANA allocated prefix to use for IDNA. "xn--" | |
792 | */ | |
793 | ||
794 | /** | |
795 | * Idna_rc: | |
796 | * @IDNA_SUCCESS: Successful operation. This value is guaranteed to | |
797 | * always be zero, the remaining ones are only guaranteed to hold | |
798 | * non-zero values, for logical comparison purposes. | |
799 | * @IDNA_STRINGPREP_ERROR: Error during string preparation. | |
800 | * @IDNA_PUNYCODE_ERROR: Error during punycode operation. | |
801 | * @IDNA_CONTAINS_NON_LDH: For IDNA_USE_STD3_ASCII_RULES, indicate that | |
802 | * the string contains non-LDH ASCII characters. | |
803 | * @IDNA_CONTAINS_MINUS: For IDNA_USE_STD3_ASCII_RULES, indicate that | |
804 | * the string contains a leading or trailing hyphen-minus (U+002D). | |
805 | * @IDNA_INVALID_LENGTH: The final output string is not within the | |
806 | * (inclusive) range 1 to 63 characters. | |
807 | * @IDNA_NO_ACE_PREFIX: The string does not contain the ACE prefix | |
808 | * (for ToUnicode). | |
809 | * @IDNA_ROUNDTRIP_VERIFY_ERROR: The ToASCII operation on output | |
810 | * string does not equal the input. | |
811 | * @IDNA_CONTAINS_ACE_PREFIX: The input contains the ACE prefix (for | |
812 | * ToASCII). | |
813 | * @IDNA_ICONV_ERROR: Could not convert string in locale encoding. | |
814 | * @IDNA_MALLOC_ERROR: Could not allocate buffer (this is typically a | |
815 | * fatal error). | |
2d7ae210 UD |
816 | * @IDNA_DLOPEN_ERROR: Could not dlopen the libcidn DSO (only used |
817 | * internally in libc). | |
01859b1c UD |
818 | * |
819 | * Enumerated return codes of idna_to_ascii_4i(), | |
820 | * idna_to_unicode_44i() functions (and functions derived from those | |
821 | * functions). The value 0 is guaranteed to always correspond to | |
822 | * success. | |
823 | */ | |
824 | ||
825 | ||
826 | /** | |
827 | * Idna_flags: | |
828 | * @IDNA_ALLOW_UNASSIGNED: Don't reject strings containing unassigned | |
829 | * Unicode code points. | |
830 | * @IDNA_USE_STD3_ASCII_RULES: Validate strings according to STD3 | |
831 | * rules (i.e., normal host name rules). | |
832 | * | |
833 | * Flags to pass to idna_to_ascii_4i(), idna_to_unicode_44i() etc. | |
834 | */ |