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/9.2/sys/libkern/iconv.c 249132 2013-04-05 08:22:11Z mav $");
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 static 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 TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
88 if (csp->cp_refcount) {
89 sx_xunlock(&iconv_lock);
90 return EBUSY;
91 }
92 }
93
94 while ((csp = TAILQ_FIRST(&iconv_cslist)) != NULL)
95 iconv_unregister_cspair(csp);
96 sx_xunlock(&iconv_lock);
97 sx_destroy(&iconv_lock);
98 return 0;
99 }
100
101 static int
102 iconv_mod_handler(module_t mod, int type, void *data)
103 {
104 int error;
105
106 switch (type) {
107 case MOD_LOAD:
108 error = 0;
109 sx_init(&iconv_lock, "iconv");
110 break;
111 case MOD_UNLOAD:
112 error = iconv_mod_unload();
113 break;
114 default:
115 error = EINVAL;
116 }
117 return error;
118 }
119
120 static moduledata_t iconv_mod = {
121 "iconv", iconv_mod_handler, NULL
122 };
123
124 DECLARE_MODULE(iconv, iconv_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
125
126 static int
127 iconv_register_converter(struct iconv_converter_class *dcp)
128 {
129 kobj_class_compile((struct kobj_class*)dcp);
130 dcp->refs++;
131 TAILQ_INSERT_TAIL(&iconv_converters, dcp, cc_link);
132 return 0;
133 }
134
135 static int
136 iconv_unregister_converter(struct iconv_converter_class *dcp)
137 {
138 if (dcp->refs > 1) {
139 ICDEBUG("converter have %d referenses left\n", dcp->refs);
140 return EBUSY;
141 }
142 TAILQ_REMOVE(&iconv_converters, dcp, cc_link);
143 kobj_class_free((struct kobj_class*)dcp);
144 return 0;
145 }
146
147 static int
148 iconv_lookupconv(const char *name, struct iconv_converter_class **dcpp)
149 {
150 struct iconv_converter_class *dcp;
151
152 TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
153 if (name == NULL)
154 continue;
155 if (strcmp(name, ICONV_CONVERTER_NAME(dcp)) == 0) {
156 if (dcpp)
157 *dcpp = dcp;
158 return 0;
159 }
160 }
161 return ENOENT;
162 }
163
164 static int
165 iconv_lookupcs(const char *to, const char *from, struct iconv_cspair **cspp)
166 {
167 struct iconv_cspair *csp;
168
169 TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
170 if (strcmp(csp->cp_to, to) == 0 &&
171 strcmp(csp->cp_from, from) == 0) {
172 if (cspp)
173 *cspp = csp;
174 return 0;
175 }
176 }
177 return ENOENT;
178 }
179
180 static int
181 iconv_register_cspair(const char *to, const char *from,
182 struct iconv_converter_class *dcp, void *data,
183 struct iconv_cspair **cspp)
184 {
185 struct iconv_cspair *csp;
186 char *cp;
187 int csize, ucsto, ucsfrom;
188
189 if (iconv_lookupcs(to, from, NULL) == 0)
190 return EEXIST;
191 csize = sizeof(*csp);
192 ucsto = strcmp(to, iconv_unicode_string) == 0;
193 if (!ucsto)
194 csize += strlen(to) + 1;
195 ucsfrom = strcmp(from, iconv_unicode_string) == 0;
196 if (!ucsfrom)
197 csize += strlen(from) + 1;
198 csp = malloc(csize, M_ICONV, M_WAITOK);
199 bzero(csp, csize);
200 csp->cp_id = iconv_csid++;
201 csp->cp_dcp = dcp;
202 cp = (char*)(csp + 1);
203 if (!ucsto) {
204 strcpy(cp, to);
205 csp->cp_to = cp;
206 cp += strlen(cp) + 1;
207 } else
208 csp->cp_to = iconv_unicode_string;
209 if (!ucsfrom) {
210 strcpy(cp, from);
211 csp->cp_from = cp;
212 } else
213 csp->cp_from = iconv_unicode_string;
214 csp->cp_data = data;
215
216 TAILQ_INSERT_TAIL(&iconv_cslist, csp, cp_link);
217 *cspp = csp;
218 return 0;
219 }
220
221 static void
222 iconv_unregister_cspair(struct iconv_cspair *csp)
223 {
224 TAILQ_REMOVE(&iconv_cslist, csp, cp_link);
225 if (csp->cp_data)
226 free(csp->cp_data, M_ICONVDATA);
227 free(csp, M_ICONV);
228 }
229
230 /*
231 * Lookup and create an instance of converter.
232 * Currently this layer didn't have associated 'instance' structure
233 * to avoid unnesessary memory allocation.
234 */
235 int
236 iconv_open(const char *to, const char *from, void **handle)
237 {
238 struct iconv_cspair *csp, *cspfrom, *cspto;
239 struct iconv_converter_class *dcp;
240 const char *cnvname;
241 int error;
242
243 /*
244 * First, lookup fully qualified cspairs
245 */
246 error = iconv_lookupcs(to, from, &csp);
247 if (error == 0)
248 return ICONV_CONVERTER_OPEN(csp->cp_dcp, csp, NULL, handle);
249
250 /*
251 * Well, nothing found. Now try to construct a composite conversion
252 * ToDo: add a 'capability' field to converter
253 */
254 TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
255 cnvname = ICONV_CONVERTER_NAME(dcp);
256 if (cnvname == NULL)
257 continue;
258 error = iconv_lookupcs(cnvname, from, &cspfrom);
259 if (error)
260 continue;
261 error = iconv_lookupcs(to, cnvname, &cspto);
262 if (error)
263 continue;
264 /*
265 * Fine, we're found a pair which can be combined together
266 */
267 return ICONV_CONVERTER_OPEN(dcp, cspto, cspfrom, handle);
268 }
269 return ENOENT;
270 }
271
272 int
273 iconv_close(void *handle)
274 {
275 return ICONV_CONVERTER_CLOSE(handle);
276 }
277
278 int
279 iconv_conv(void *handle, const char **inbuf,
280 size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
281 {
282 return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 0, 0);
283 }
284
285 int
286 iconv_conv_case(void *handle, const char **inbuf,
287 size_t *inbytesleft, char **outbuf, size_t *outbytesleft, int casetype)
288 {
289 return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 0, casetype);
290 }
291
292 int
293 iconv_convchr(void *handle, const char **inbuf,
294 size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
295 {
296 return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 1, 0);
297 }
298
299 int
300 iconv_convchr_case(void *handle, const char **inbuf,
301 size_t *inbytesleft, char **outbuf, size_t *outbytesleft, int casetype)
302 {
303 return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 1, casetype);
304 }
305
306 int
307 towlower(int c, void *handle)
308 {
309 return ICONV_CONVERTER_TOLOWER(handle, c);
310 }
311
312 int
313 towupper(int c, void *handle)
314 {
315 return ICONV_CONVERTER_TOUPPER(handle, c);
316 }
317
318 /*
319 * Give a list of loaded converters. Each name terminated with 0.
320 * An empty string terminates the list.
321 */
322 static int
323 iconv_sysctl_drvlist(SYSCTL_HANDLER_ARGS)
324 {
325 struct iconv_converter_class *dcp;
326 const char *name;
327 char spc;
328 int error;
329
330 error = 0;
331 sx_slock(&iconv_lock);
332 TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
333 name = ICONV_CONVERTER_NAME(dcp);
334 if (name == NULL)
335 continue;
336 error = SYSCTL_OUT(req, name, strlen(name) + 1);
337 if (error)
338 break;
339 }
340 sx_sunlock(&iconv_lock);
341 if (error)
342 return error;
343 spc = 0;
344 error = SYSCTL_OUT(req, &spc, sizeof(spc));
345 return error;
346 }
347
348 SYSCTL_PROC(_kern_iconv, OID_AUTO, drvlist, CTLFLAG_RD | CTLTYPE_OPAQUE,
349 NULL, 0, iconv_sysctl_drvlist, "S,xlat", "registered converters");
350
351 /*
352 * List all available charset pairs.
353 */
354 static int
355 iconv_sysctl_cslist(SYSCTL_HANDLER_ARGS)
356 {
357 struct iconv_cspair *csp;
358 struct iconv_cspair_info csi;
359 int error;
360
361 error = 0;
362 bzero(&csi, sizeof(csi));
363 csi.cs_version = ICONV_CSPAIR_INFO_VER;
364 sx_slock(&iconv_lock);
365 TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
366 csi.cs_id = csp->cp_id;
367 csi.cs_refcount = csp->cp_refcount;
368 csi.cs_base = csp->cp_base ? csp->cp_base->cp_id : 0;
369 strcpy(csi.cs_to, csp->cp_to);
370 strcpy(csi.cs_from, csp->cp_from);
371 error = SYSCTL_OUT(req, &csi, sizeof(csi));
372 if (error)
373 break;
374 }
375 sx_sunlock(&iconv_lock);
376 return error;
377 }
378
379 SYSCTL_PROC(_kern_iconv, OID_AUTO, cslist, CTLFLAG_RD | CTLTYPE_OPAQUE,
380 NULL, 0, iconv_sysctl_cslist, "S,xlat", "registered charset pairs");
381
382 int
383 iconv_add(const char *converter, const char *to, const char *from)
384 {
385 struct iconv_converter_class *dcp;
386 struct iconv_cspair *csp;
387
388 if (iconv_lookupconv(converter, &dcp) != 0)
389 return EINVAL;
390
391 return iconv_register_cspair(to, from, dcp, NULL, &csp);
392 }
393
394 /*
395 * Add new charset pair
396 */
397 static int
398 iconv_sysctl_add(SYSCTL_HANDLER_ARGS)
399 {
400 struct iconv_converter_class *dcp;
401 struct iconv_cspair *csp;
402 struct iconv_add_in din;
403 struct iconv_add_out dout;
404 int error;
405
406 error = SYSCTL_IN(req, &din, sizeof(din));
407 if (error)
408 return error;
409 if (din.ia_version != ICONV_ADD_VER)
410 return EINVAL;
411 if (din.ia_datalen > ICONV_CSMAXDATALEN)
412 return EINVAL;
413 if (strlen(din.ia_from) >= ICONV_CSNMAXLEN)
414 return EINVAL;
415 if (strlen(din.ia_to) >= ICONV_CSNMAXLEN)
416 return EINVAL;
417 if (strlen(din.ia_converter) >= ICONV_CNVNMAXLEN)
418 return EINVAL;
419 if (iconv_lookupconv(din.ia_converter, &dcp) != 0)
420 return EINVAL;
421 sx_xlock(&iconv_lock);
422 error = iconv_register_cspair(din.ia_to, din.ia_from, dcp, NULL, &csp);
423 if (error) {
424 sx_xunlock(&iconv_lock);
425 return error;
426 }
427 if (din.ia_datalen) {
428 csp->cp_data = malloc(din.ia_datalen, M_ICONVDATA, M_WAITOK);
429 error = copyin(din.ia_data, csp->cp_data, din.ia_datalen);
430 if (error)
431 goto bad;
432 }
433 dout.ia_csid = csp->cp_id;
434 error = SYSCTL_OUT(req, &dout, sizeof(dout));
435 if (error)
436 goto bad;
437 sx_xunlock(&iconv_lock);
438 ICDEBUG("%s => %s, %d bytes\n",din.ia_from, din.ia_to, din.ia_datalen);
439 return 0;
440 bad:
441 iconv_unregister_cspair(csp);
442 sx_xunlock(&iconv_lock);
443 return error;
444 }
445
446 SYSCTL_PROC(_kern_iconv, OID_AUTO, add, CTLFLAG_RW | CTLTYPE_OPAQUE,
447 NULL, 0, iconv_sysctl_add, "S,xlat", "register charset pair");
448
449 /*
450 * Default stubs for converters
451 */
452 int
453 iconv_converter_initstub(struct iconv_converter_class *dp)
454 {
455 return 0;
456 }
457
458 int
459 iconv_converter_donestub(struct iconv_converter_class *dp)
460 {
461 return 0;
462 }
463
464 int
465 iconv_converter_tolowerstub(int c, void *handle)
466 {
467 return (c);
468 }
469
470 int
471 iconv_converter_handler(module_t mod, int type, void *data)
472 {
473 struct iconv_converter_class *dcp = data;
474 int error;
475
476 switch (type) {
477 case MOD_LOAD:
478 sx_xlock(&iconv_lock);
479 error = iconv_register_converter(dcp);
480 if (error) {
481 sx_xunlock(&iconv_lock);
482 break;
483 }
484 error = ICONV_CONVERTER_INIT(dcp);
485 if (error)
486 iconv_unregister_converter(dcp);
487 sx_xunlock(&iconv_lock);
488 break;
489 case MOD_UNLOAD:
490 sx_xlock(&iconv_lock);
491 ICONV_CONVERTER_DONE(dcp);
492 error = iconv_unregister_converter(dcp);
493 sx_xunlock(&iconv_lock);
494 break;
495 default:
496 error = EINVAL;
497 }
498 return error;
499 }
500
501 /*
502 * Common used functions (don't use with unicode)
503 */
504 char *
505 iconv_convstr(void *handle, char *dst, const char *src)
506 {
507 char *p = dst;
508 size_t inlen, outlen;
509 int error;
510
511 if (handle == NULL) {
512 strcpy(dst, src);
513 return dst;
514 }
515 inlen = outlen = strlen(src);
516 error = iconv_conv(handle, NULL, NULL, &p, &outlen);
517 if (error)
518 return NULL;
519 error = iconv_conv(handle, &src, &inlen, &p, &outlen);
520 if (error)
521 return NULL;
522 *p = 0;
523 return dst;
524 }
525
526 void *
527 iconv_convmem(void *handle, void *dst, const void *src, int size)
528 {
529 const char *s = src;
530 char *d = dst;
531 size_t inlen, outlen;
532 int error;
533
534 if (size == 0)
535 return dst;
536 if (handle == NULL) {
537 memcpy(dst, src, size);
538 return dst;
539 }
540 inlen = outlen = size;
541 error = iconv_conv(handle, NULL, NULL, &d, &outlen);
542 if (error)
543 return NULL;
544 error = iconv_conv(handle, &s, &inlen, &d, &outlen);
545 if (error)
546 return NULL;
547 return dst;
548 }
549
550 int
551 iconv_lookupcp(char **cpp, const char *s)
552 {
553 if (cpp == NULL) {
554 ICDEBUG("warning a NULL list passed\n", ""); /* XXX ISO variadic macros cannot
555 leave out the
556 variadic args */
557 return ENOENT;
558 }
559 for (; *cpp; cpp++)
560 if (strcmp(*cpp, s) == 0)
561 return 0;
562 return ENOENT;
563 }
564
565 /*
566 * Return if fsname is in use of not
567 */
568 int
569 iconv_vfs_refcount(const char *fsname)
570 {
571 struct vfsconf *vfsp;
572
573 vfsp = vfs_byname(fsname);
574 if (vfsp != NULL && vfsp->vfc_refcount > 0)
575 return (EBUSY);
576 return (0);
577 }
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