FreeBSD/Linux Kernel Cross Reference
sys/libkern/iconv.c
1 /*-
2 * Copyright (c) 2000-2001 Boris Popov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/9.0/sys/libkern/iconv.c 206361 2010-04-07 16:50:38Z joel $");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/iconv.h>
34 #include <sys/malloc.h>
35 #include <sys/mount.h>
36 #include <sys/sx.h>
37 #include <sys/syslog.h>
38
39 #include "iconv_converter_if.h"
40
41 SYSCTL_DECL(_kern_iconv);
42
43 SYSCTL_NODE(_kern, OID_AUTO, iconv, CTLFLAG_RW, NULL, "kernel iconv interface");
44
45 MALLOC_DEFINE(M_ICONV, "iconv", "ICONV structures");
46 MALLOC_DEFINE(M_ICONVDATA, "iconv_data", "ICONV data");
47
48 MODULE_VERSION(libiconv, 2);
49
50 static struct sx iconv_lock;
51
52 #ifdef notnow
53 /*
54 * iconv converter instance
55 */
56 struct iconv_converter {
57 KOBJ_FIELDS;
58 void * c_data;
59 };
60 #endif
61
62 struct sysctl_oid *iconv_oid_hook = &sysctl___kern_iconv;
63
64 /*
65 * List of loaded converters
66 */
67 static TAILQ_HEAD(iconv_converter_list, iconv_converter_class)
68 iconv_converters = TAILQ_HEAD_INITIALIZER(iconv_converters);
69
70 /*
71 * List of supported/loaded charsets pairs
72 */
73 static TAILQ_HEAD(, iconv_cspair)
74 iconv_cslist = TAILQ_HEAD_INITIALIZER(iconv_cslist);
75 static int iconv_csid = 1;
76
77 static char iconv_unicode_string[] = "unicode"; /* save eight bytes when possible */
78
79 static void iconv_unregister_cspair(struct iconv_cspair *csp);
80
81 static int
82 iconv_mod_unload(void)
83 {
84 struct iconv_cspair *csp;
85
86 sx_xlock(&iconv_lock);
87 while ((csp = TAILQ_FIRST(&iconv_cslist)) != NULL) {
88 if (csp->cp_refcount)
89 return EBUSY;
90 }
91
92 while ((csp = TAILQ_FIRST(&iconv_cslist)) != NULL)
93 iconv_unregister_cspair(csp);
94 sx_xunlock(&iconv_lock);
95 sx_destroy(&iconv_lock);
96 return 0;
97 }
98
99 static int
100 iconv_mod_handler(module_t mod, int type, void *data)
101 {
102 int error;
103
104 switch (type) {
105 case MOD_LOAD:
106 error = 0;
107 sx_init(&iconv_lock, "iconv");
108 break;
109 case MOD_UNLOAD:
110 error = iconv_mod_unload();
111 break;
112 default:
113 error = EINVAL;
114 }
115 return error;
116 }
117
118 static moduledata_t iconv_mod = {
119 "iconv", iconv_mod_handler, NULL
120 };
121
122 DECLARE_MODULE(iconv, iconv_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
123
124 static int
125 iconv_register_converter(struct iconv_converter_class *dcp)
126 {
127 kobj_class_compile((struct kobj_class*)dcp);
128 dcp->refs++;
129 TAILQ_INSERT_TAIL(&iconv_converters, dcp, cc_link);
130 return 0;
131 }
132
133 static int
134 iconv_unregister_converter(struct iconv_converter_class *dcp)
135 {
136 if (dcp->refs > 1) {
137 ICDEBUG("converter have %d referenses left\n", dcp->refs);
138 return EBUSY;
139 }
140 TAILQ_REMOVE(&iconv_converters, dcp, cc_link);
141 kobj_class_free((struct kobj_class*)dcp);
142 return 0;
143 }
144
145 static int
146 iconv_lookupconv(const char *name, struct iconv_converter_class **dcpp)
147 {
148 struct iconv_converter_class *dcp;
149
150 TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
151 if (name == NULL)
152 continue;
153 if (strcmp(name, ICONV_CONVERTER_NAME(dcp)) == 0) {
154 if (dcpp)
155 *dcpp = dcp;
156 return 0;
157 }
158 }
159 return ENOENT;
160 }
161
162 static int
163 iconv_lookupcs(const char *to, const char *from, struct iconv_cspair **cspp)
164 {
165 struct iconv_cspair *csp;
166
167 TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
168 if (strcmp(csp->cp_to, to) == 0 &&
169 strcmp(csp->cp_from, from) == 0) {
170 if (cspp)
171 *cspp = csp;
172 return 0;
173 }
174 }
175 return ENOENT;
176 }
177
178 static int
179 iconv_register_cspair(const char *to, const char *from,
180 struct iconv_converter_class *dcp, void *data,
181 struct iconv_cspair **cspp)
182 {
183 struct iconv_cspair *csp;
184 char *cp;
185 int csize, ucsto, ucsfrom;
186
187 if (iconv_lookupcs(to, from, NULL) == 0)
188 return EEXIST;
189 csize = sizeof(*csp);
190 ucsto = strcmp(to, iconv_unicode_string) == 0;
191 if (!ucsto)
192 csize += strlen(to) + 1;
193 ucsfrom = strcmp(from, iconv_unicode_string) == 0;
194 if (!ucsfrom)
195 csize += strlen(from) + 1;
196 csp = malloc(csize, M_ICONV, M_WAITOK);
197 bzero(csp, csize);
198 csp->cp_id = iconv_csid++;
199 csp->cp_dcp = dcp;
200 cp = (char*)(csp + 1);
201 if (!ucsto) {
202 strcpy(cp, to);
203 csp->cp_to = cp;
204 cp += strlen(cp) + 1;
205 } else
206 csp->cp_to = iconv_unicode_string;
207 if (!ucsfrom) {
208 strcpy(cp, from);
209 csp->cp_from = cp;
210 } else
211 csp->cp_from = iconv_unicode_string;
212 csp->cp_data = data;
213
214 TAILQ_INSERT_TAIL(&iconv_cslist, csp, cp_link);
215 *cspp = csp;
216 return 0;
217 }
218
219 static void
220 iconv_unregister_cspair(struct iconv_cspair *csp)
221 {
222 TAILQ_REMOVE(&iconv_cslist, csp, cp_link);
223 if (csp->cp_data)
224 free(csp->cp_data, M_ICONVDATA);
225 free(csp, M_ICONV);
226 }
227
228 /*
229 * Lookup and create an instance of converter.
230 * Currently this layer didn't have associated 'instance' structure
231 * to avoid unnesessary memory allocation.
232 */
233 int
234 iconv_open(const char *to, const char *from, void **handle)
235 {
236 struct iconv_cspair *csp, *cspfrom, *cspto;
237 struct iconv_converter_class *dcp;
238 const char *cnvname;
239 int error;
240
241 /*
242 * First, lookup fully qualified cspairs
243 */
244 error = iconv_lookupcs(to, from, &csp);
245 if (error == 0)
246 return ICONV_CONVERTER_OPEN(csp->cp_dcp, csp, NULL, handle);
247
248 /*
249 * Well, nothing found. Now try to construct a composite conversion
250 * ToDo: add a 'capability' field to converter
251 */
252 TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
253 cnvname = ICONV_CONVERTER_NAME(dcp);
254 if (cnvname == NULL)
255 continue;
256 error = iconv_lookupcs(cnvname, from, &cspfrom);
257 if (error)
258 continue;
259 error = iconv_lookupcs(to, cnvname, &cspto);
260 if (error)
261 continue;
262 /*
263 * Fine, we're found a pair which can be combined together
264 */
265 return ICONV_CONVERTER_OPEN(dcp, cspto, cspfrom, handle);
266 }
267 return ENOENT;
268 }
269
270 int
271 iconv_close(void *handle)
272 {
273 return ICONV_CONVERTER_CLOSE(handle);
274 }
275
276 int
277 iconv_conv(void *handle, const char **inbuf,
278 size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
279 {
280 return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 0, 0);
281 }
282
283 int
284 iconv_conv_case(void *handle, const char **inbuf,
285 size_t *inbytesleft, char **outbuf, size_t *outbytesleft, int casetype)
286 {
287 return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 0, casetype);
288 }
289
290 int
291 iconv_convchr(void *handle, const char **inbuf,
292 size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
293 {
294 return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 1, 0);
295 }
296
297 int
298 iconv_convchr_case(void *handle, const char **inbuf,
299 size_t *inbytesleft, char **outbuf, size_t *outbytesleft, int casetype)
300 {
301 return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 1, casetype);
302 }
303
304 int
305 towlower(int c, void *handle)
306 {
307 return ICONV_CONVERTER_TOLOWER(handle, c);
308 }
309
310 int
311 towupper(int c, void *handle)
312 {
313 return ICONV_CONVERTER_TOUPPER(handle, c);
314 }
315
316 /*
317 * Give a list of loaded converters. Each name terminated with 0.
318 * An empty string terminates the list.
319 */
320 static int
321 iconv_sysctl_drvlist(SYSCTL_HANDLER_ARGS)
322 {
323 struct iconv_converter_class *dcp;
324 const char *name;
325 char spc;
326 int error;
327
328 error = 0;
329 sx_slock(&iconv_lock);
330 TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
331 name = ICONV_CONVERTER_NAME(dcp);
332 if (name == NULL)
333 continue;
334 error = SYSCTL_OUT(req, name, strlen(name) + 1);
335 if (error)
336 break;
337 }
338 sx_sunlock(&iconv_lock);
339 if (error)
340 return error;
341 spc = 0;
342 error = SYSCTL_OUT(req, &spc, sizeof(spc));
343 return error;
344 }
345
346 SYSCTL_PROC(_kern_iconv, OID_AUTO, drvlist, CTLFLAG_RD | CTLTYPE_OPAQUE,
347 NULL, 0, iconv_sysctl_drvlist, "S,xlat", "registered converters");
348
349 /*
350 * List all available charset pairs.
351 */
352 static int
353 iconv_sysctl_cslist(SYSCTL_HANDLER_ARGS)
354 {
355 struct iconv_cspair *csp;
356 struct iconv_cspair_info csi;
357 int error;
358
359 error = 0;
360 bzero(&csi, sizeof(csi));
361 csi.cs_version = ICONV_CSPAIR_INFO_VER;
362 sx_slock(&iconv_lock);
363 TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
364 csi.cs_id = csp->cp_id;
365 csi.cs_refcount = csp->cp_refcount;
366 csi.cs_base = csp->cp_base ? csp->cp_base->cp_id : 0;
367 strcpy(csi.cs_to, csp->cp_to);
368 strcpy(csi.cs_from, csp->cp_from);
369 error = SYSCTL_OUT(req, &csi, sizeof(csi));
370 if (error)
371 break;
372 }
373 sx_sunlock(&iconv_lock);
374 return error;
375 }
376
377 SYSCTL_PROC(_kern_iconv, OID_AUTO, cslist, CTLFLAG_RD | CTLTYPE_OPAQUE,
378 NULL, 0, iconv_sysctl_cslist, "S,xlat", "registered charset pairs");
379
380 /*
381 * Add new charset pair
382 */
383 static int
384 iconv_sysctl_add(SYSCTL_HANDLER_ARGS)
385 {
386 struct iconv_converter_class *dcp;
387 struct iconv_cspair *csp;
388 struct iconv_add_in din;
389 struct iconv_add_out dout;
390 int error;
391
392 error = SYSCTL_IN(req, &din, sizeof(din));
393 if (error)
394 return error;
395 if (din.ia_version != ICONV_ADD_VER)
396 return EINVAL;
397 if (din.ia_datalen > ICONV_CSMAXDATALEN)
398 return EINVAL;
399 if (strlen(din.ia_from) >= ICONV_CSNMAXLEN)
400 return EINVAL;
401 if (strlen(din.ia_to) >= ICONV_CSNMAXLEN)
402 return EINVAL;
403 if (strlen(din.ia_converter) >= ICONV_CNVNMAXLEN)
404 return EINVAL;
405 if (iconv_lookupconv(din.ia_converter, &dcp) != 0)
406 return EINVAL;
407 sx_xlock(&iconv_lock);
408 error = iconv_register_cspair(din.ia_to, din.ia_from, dcp, NULL, &csp);
409 if (error) {
410 sx_xunlock(&iconv_lock);
411 return error;
412 }
413 if (din.ia_datalen) {
414 csp->cp_data = malloc(din.ia_datalen, M_ICONVDATA, M_WAITOK);
415 error = copyin(din.ia_data, csp->cp_data, din.ia_datalen);
416 if (error)
417 goto bad;
418 }
419 dout.ia_csid = csp->cp_id;
420 error = SYSCTL_OUT(req, &dout, sizeof(dout));
421 if (error)
422 goto bad;
423 sx_xunlock(&iconv_lock);
424 ICDEBUG("%s => %s, %d bytes\n",din.ia_from, din.ia_to, din.ia_datalen);
425 return 0;
426 bad:
427 iconv_unregister_cspair(csp);
428 sx_xunlock(&iconv_lock);
429 return error;
430 }
431
432 SYSCTL_PROC(_kern_iconv, OID_AUTO, add, CTLFLAG_RW | CTLTYPE_OPAQUE,
433 NULL, 0, iconv_sysctl_add, "S,xlat", "register charset pair");
434
435 /*
436 * Default stubs for converters
437 */
438 int
439 iconv_converter_initstub(struct iconv_converter_class *dp)
440 {
441 return 0;
442 }
443
444 int
445 iconv_converter_donestub(struct iconv_converter_class *dp)
446 {
447 return 0;
448 }
449
450 int
451 iconv_converter_tolowerstub(int c, void *handle)
452 {
453 return (c);
454 }
455
456 int
457 iconv_converter_handler(module_t mod, int type, void *data)
458 {
459 struct iconv_converter_class *dcp = data;
460 int error;
461
462 switch (type) {
463 case MOD_LOAD:
464 sx_xlock(&iconv_lock);
465 error = iconv_register_converter(dcp);
466 if (error) {
467 sx_xunlock(&iconv_lock);
468 break;
469 }
470 error = ICONV_CONVERTER_INIT(dcp);
471 if (error)
472 iconv_unregister_converter(dcp);
473 sx_xunlock(&iconv_lock);
474 break;
475 case MOD_UNLOAD:
476 sx_xlock(&iconv_lock);
477 ICONV_CONVERTER_DONE(dcp);
478 error = iconv_unregister_converter(dcp);
479 sx_xunlock(&iconv_lock);
480 break;
481 default:
482 error = EINVAL;
483 }
484 return error;
485 }
486
487 /*
488 * Common used functions (don't use with unicode)
489 */
490 char *
491 iconv_convstr(void *handle, char *dst, const char *src)
492 {
493 char *p = dst;
494 size_t inlen, outlen;
495 int error;
496
497 if (handle == NULL) {
498 strcpy(dst, src);
499 return dst;
500 }
501 inlen = outlen = strlen(src);
502 error = iconv_conv(handle, NULL, NULL, &p, &outlen);
503 if (error)
504 return NULL;
505 error = iconv_conv(handle, &src, &inlen, &p, &outlen);
506 if (error)
507 return NULL;
508 *p = 0;
509 return dst;
510 }
511
512 void *
513 iconv_convmem(void *handle, void *dst, const void *src, int size)
514 {
515 const char *s = src;
516 char *d = dst;
517 size_t inlen, outlen;
518 int error;
519
520 if (size == 0)
521 return dst;
522 if (handle == NULL) {
523 memcpy(dst, src, size);
524 return dst;
525 }
526 inlen = outlen = size;
527 error = iconv_conv(handle, NULL, NULL, &d, &outlen);
528 if (error)
529 return NULL;
530 error = iconv_conv(handle, &s, &inlen, &d, &outlen);
531 if (error)
532 return NULL;
533 return dst;
534 }
535
536 int
537 iconv_lookupcp(char **cpp, const char *s)
538 {
539 if (cpp == NULL) {
540 ICDEBUG("warning a NULL list passed\n", ""); /* XXX ISO variadic macros cannot
541 leave out the
542 variadic args */
543 return ENOENT;
544 }
545 for (; *cpp; cpp++)
546 if (strcmp(*cpp, s) == 0)
547 return 0;
548 return ENOENT;
549 }
550
551 /*
552 * Return if fsname is in use of not
553 */
554 int
555 iconv_vfs_refcount(const char *fsname)
556 {
557 struct vfsconf *vfsp;
558
559 vfsp = vfs_byname(fsname);
560 if (vfsp != NULL && vfsp->vfc_refcount > 0)
561 return (EBUSY);
562 return (0);
563 }
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