iconv.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2000-2001 Boris Popov
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/iconv.h>
   36 #include <sys/malloc.h>
   37 #include <sys/mount.h>
   38 #include <sys/sx.h>
   39 #include <sys/syslog.h>
   40 
   41 #include "iconv_converter_if.h"
   42 
   43 SYSCTL_DECL(_kern_iconv);
   44 
   45 SYSCTL_NODE(_kern, OID_AUTO, iconv, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
   46     "kernel iconv interface");
   47 
   48 MALLOC_DEFINE(M_ICONV, "iconv", "ICONV structures");
   49 static MALLOC_DEFINE(M_ICONVDATA, "iconv_data", "ICONV data");
   50 
   51 MODULE_VERSION(libiconv, 2);
   52 
   53 static struct sx iconv_lock;
   54 
   55 #ifdef notnow
   56 /*
   57  * iconv converter instance
   58  */
   59 struct iconv_converter {
   60         KOBJ_FIELDS;
   61         void *                  c_data;
   62 };
   63 #endif
   64 
   65 struct sysctl_oid *iconv_oid_hook = &sysctl___kern_iconv;
   66 
   67 /*
   68  * List of loaded converters
   69  */
   70 static TAILQ_HEAD(iconv_converter_list, iconv_converter_class)
   71     iconv_converters = TAILQ_HEAD_INITIALIZER(iconv_converters);
   72 
   73 /*
   74  * List of supported/loaded charsets pairs
   75  */
   76 static TAILQ_HEAD(, iconv_cspair)
   77     iconv_cslist = TAILQ_HEAD_INITIALIZER(iconv_cslist);
   78 static int iconv_csid = 1;
   79 
   80 static char iconv_unicode_string[] = "unicode"; /* save eight bytes when possible */
   81 
   82 static void iconv_unregister_cspair(struct iconv_cspair *csp);
   83 
   84 static int
   85 iconv_mod_unload(void)
   86 {
   87         struct iconv_cspair *csp;
   88 
   89         sx_xlock(&iconv_lock);
   90         TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
   91                 if (csp->cp_refcount) {
   92                         sx_xunlock(&iconv_lock);
   93                         return EBUSY;
   94                 }
   95         }
   96 
   97         while ((csp = TAILQ_FIRST(&iconv_cslist)) != NULL)
   98                 iconv_unregister_cspair(csp);
   99         sx_xunlock(&iconv_lock);
  100         sx_destroy(&iconv_lock);
  101         return 0;
  102 }
  103 
  104 static int
  105 iconv_mod_handler(module_t mod, int type, void *data)
  106 {
  107         int error;
  108 
  109         switch (type) {
  110             case MOD_LOAD:
  111                 error = 0;
  112                 sx_init(&iconv_lock, "iconv");
  113                 break;
  114             case MOD_UNLOAD:
  115                 error = iconv_mod_unload();
  116                 break;
  117             default:
  118                 error = EINVAL;
  119         }
  120         return error;
  121 }
  122 
  123 static moduledata_t iconv_mod = {
  124         "iconv", iconv_mod_handler, NULL
  125 };
  126 
  127 DECLARE_MODULE(iconv, iconv_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
  128 
  129 static int
  130 iconv_register_converter(struct iconv_converter_class *dcp)
  131 {
  132         kobj_class_compile((struct kobj_class*)dcp);
  133         dcp->refs++;
  134         TAILQ_INSERT_TAIL(&iconv_converters, dcp, cc_link);
  135         return 0;
  136 }
  137 
  138 static int
  139 iconv_unregister_converter(struct iconv_converter_class *dcp)
  140 {
  141         dcp->refs--;
  142         if (dcp->refs > 1) {
  143                 ICDEBUG("converter has %d references left\n", dcp->refs);
  144                 return EBUSY;
  145         }
  146         TAILQ_REMOVE(&iconv_converters, dcp, cc_link);
  147         kobj_class_free((struct kobj_class*)dcp);
  148         return 0;
  149 }
  150 
  151 static int
  152 iconv_lookupconv(const char *name, struct iconv_converter_class **dcpp)
  153 {
  154         struct iconv_converter_class *dcp;
  155 
  156         TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
  157                 if (name == NULL)
  158                         continue;
  159                 if (strcmp(name, ICONV_CONVERTER_NAME(dcp)) == 0) {
  160                         if (dcpp)
  161                                 *dcpp = dcp;
  162                         return 0;
  163                 }
  164         }
  165         return ENOENT;
  166 }
  167 
  168 static int
  169 iconv_lookupcs(const char *to, const char *from, struct iconv_cspair **cspp)
  170 {
  171         struct iconv_cspair *csp;
  172 
  173         TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
  174                 if (strcasecmp(csp->cp_to, to) == 0 &&
  175                     strcasecmp(csp->cp_from, from) == 0) {
  176                         if (cspp)
  177                                 *cspp = csp;
  178                         return 0;
  179                 }
  180         }
  181         return ENOENT;
  182 }
  183 
  184 static int
  185 iconv_register_cspair(const char *to, const char *from,
  186         struct iconv_converter_class *dcp, void *data,
  187         struct iconv_cspair **cspp)
  188 {
  189         struct iconv_cspair *csp;
  190         char *cp;
  191         int csize, ucsto, ucsfrom;
  192 
  193         if (iconv_lookupcs(to, from, NULL) == 0)
  194                 return EEXIST;
  195         csize = sizeof(*csp);
  196         ucsto = strcmp(to, iconv_unicode_string) == 0;
  197         if (!ucsto)
  198                 csize += strlen(to) + 1;
  199         ucsfrom = strcmp(from, iconv_unicode_string) == 0;
  200         if (!ucsfrom)
  201                 csize += strlen(from) + 1;
  202         csp = malloc(csize, M_ICONV, M_WAITOK);
  203         bzero(csp, csize);
  204         csp->cp_id = iconv_csid++;
  205         csp->cp_dcp = dcp;
  206         cp = (char*)(csp + 1);
  207         if (!ucsto) {
  208                 strcpy(cp, to);
  209                 csp->cp_to = cp;
  210                 cp += strlen(cp) + 1;
  211         } else
  212                 csp->cp_to = iconv_unicode_string;
  213         if (!ucsfrom) {
  214                 strcpy(cp, from);
  215                 csp->cp_from = cp;
  216         } else
  217                 csp->cp_from = iconv_unicode_string;
  218         csp->cp_data = data;
  219 
  220         TAILQ_INSERT_TAIL(&iconv_cslist, csp, cp_link);
  221         *cspp = csp;
  222         return 0;
  223 }
  224 
  225 static void
  226 iconv_unregister_cspair(struct iconv_cspair *csp)
  227 {
  228         TAILQ_REMOVE(&iconv_cslist, csp, cp_link);
  229         if (csp->cp_data)
  230                 free(csp->cp_data, M_ICONVDATA);
  231         free(csp, M_ICONV);
  232 }
  233 
  234 /*
  235  * Lookup and create an instance of converter.
  236  * Currently this layer didn't have associated 'instance' structure
  237  * to avoid unnesessary memory allocation.
  238  */
  239 int
  240 iconv_open(const char *to, const char *from, void **handle)
  241 {
  242         struct iconv_cspair *csp, *cspfrom, *cspto;
  243         struct iconv_converter_class *dcp;
  244         const char *cnvname;
  245         int error;
  246 
  247         /*
  248          * First, lookup fully qualified cspairs
  249          */
  250         error = iconv_lookupcs(to, from, &csp);
  251         if (error == 0)
  252                 return ICONV_CONVERTER_OPEN(csp->cp_dcp, csp, NULL, handle);
  253 
  254         /*
  255          * Well, nothing found. Now try to construct a composite conversion
  256          * ToDo: add a 'capability' field to converter
  257          */
  258         TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
  259                 cnvname = ICONV_CONVERTER_NAME(dcp);
  260                 if (cnvname == NULL)
  261                         continue;
  262                 error = iconv_lookupcs(cnvname, from, &cspfrom);
  263                 if (error)
  264                         continue;
  265                 error = iconv_lookupcs(to, cnvname, &cspto);
  266                 if (error)
  267                         continue;
  268                 /*
  269                  * Fine, we're found a pair which can be combined together
  270                  */
  271                 return ICONV_CONVERTER_OPEN(dcp, cspto, cspfrom, handle);
  272         }
  273         return ENOENT;
  274 }
  275 
  276 int
  277 iconv_close(void *handle)
  278 {
  279         return ICONV_CONVERTER_CLOSE(handle);
  280 }
  281 
  282 int
  283 iconv_conv(void *handle, const char **inbuf,
  284         size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
  285 {
  286         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 0, 0);
  287 }
  288 
  289 int
  290 iconv_conv_case(void *handle, const char **inbuf,
  291         size_t *inbytesleft, char **outbuf, size_t *outbytesleft, int casetype)
  292 {
  293         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 0, casetype);
  294 }
  295 
  296 int
  297 iconv_convchr(void *handle, const char **inbuf,
  298         size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
  299 {
  300         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 1, 0);
  301 }
  302 
  303 int
  304 iconv_convchr_case(void *handle, const char **inbuf,
  305         size_t *inbytesleft, char **outbuf, size_t *outbytesleft, int casetype)
  306 {
  307         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 1, casetype);
  308 }
  309 
  310 int
  311 towlower(int c, void *handle)
  312 {
  313         return ICONV_CONVERTER_TOLOWER(handle, c);
  314 }
  315 
  316 int
  317 towupper(int c, void *handle)
  318 {
  319         return ICONV_CONVERTER_TOUPPER(handle, c);
  320 }
  321 
  322 /*
  323  * Give a list of loaded converters. Each name terminated with 0.
  324  * An empty string terminates the list.
  325  */
  326 static int
  327 iconv_sysctl_drvlist(SYSCTL_HANDLER_ARGS)
  328 {
  329         struct iconv_converter_class *dcp;
  330         const char *name;
  331         char spc;
  332         int error;
  333 
  334         error = 0;
  335         sx_slock(&iconv_lock);
  336         TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
  337                 name = ICONV_CONVERTER_NAME(dcp);
  338                 if (name == NULL)
  339                         continue;
  340                 error = SYSCTL_OUT(req, name, strlen(name) + 1);
  341                 if (error)
  342                         break;
  343         }
  344         sx_sunlock(&iconv_lock);
  345         if (error)
  346                 return error;
  347         spc = 0;
  348         error = SYSCTL_OUT(req, &spc, sizeof(spc));
  349         return error;
  350 }
  351 
  352 SYSCTL_PROC(_kern_iconv, OID_AUTO, drvlist,
  353     CTLFLAG_RD | CTLTYPE_OPAQUE | CTLFLAG_MPSAFE, NULL, 0,
  354     iconv_sysctl_drvlist, "S,xlat",
  355     "registered converters");
  356 
  357 /*
  358  * List all available charset pairs.
  359  */
  360 static int
  361 iconv_sysctl_cslist(SYSCTL_HANDLER_ARGS)
  362 {
  363         struct iconv_cspair *csp;
  364         struct iconv_cspair_info csi;
  365         int error;
  366 
  367         error = 0;
  368         bzero(&csi, sizeof(csi));
  369         csi.cs_version = ICONV_CSPAIR_INFO_VER;
  370         sx_slock(&iconv_lock);
  371         TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
  372                 csi.cs_id = csp->cp_id;
  373                 csi.cs_refcount = csp->cp_refcount;
  374                 csi.cs_base = csp->cp_base ? csp->cp_base->cp_id : 0;
  375                 strcpy(csi.cs_to, csp->cp_to);
  376                 strcpy(csi.cs_from, csp->cp_from);
  377                 error = SYSCTL_OUT(req, &csi, sizeof(csi));
  378                 if (error)
  379                         break;
  380         }
  381         sx_sunlock(&iconv_lock);
  382         return error;
  383 }
  384 
  385 SYSCTL_PROC(_kern_iconv, OID_AUTO, cslist,
  386     CTLFLAG_RD | CTLTYPE_OPAQUE | CTLFLAG_MPSAFE, NULL, 0,
  387     iconv_sysctl_cslist, "S,xlat",
  388     "registered charset pairs");
  389 
  390 int
  391 iconv_add(const char *converter, const char *to, const char *from)
  392 {
  393         struct iconv_converter_class *dcp;
  394         struct iconv_cspair *csp;
  395 
  396         if (iconv_lookupconv(converter, &dcp) != 0)
  397                 return EINVAL;
  398 
  399         return iconv_register_cspair(to, from, dcp, NULL, &csp);
  400 }
  401 
  402 /*
  403  * Add new charset pair
  404  */
  405 static int
  406 iconv_sysctl_add(SYSCTL_HANDLER_ARGS)
  407 {
  408         struct iconv_converter_class *dcp;
  409         struct iconv_cspair *csp;
  410         struct iconv_add_in din;
  411         struct iconv_add_out dout;
  412         int error;
  413 
  414         error = SYSCTL_IN(req, &din, sizeof(din));
  415         if (error)
  416                 return error;
  417         if (din.ia_version != ICONV_ADD_VER)
  418                 return EINVAL;
  419         if (din.ia_datalen > ICONV_CSMAXDATALEN)
  420                 return EINVAL;
  421         if (strnlen(din.ia_from, sizeof(din.ia_from)) >= ICONV_CSNMAXLEN)
  422                 return EINVAL;
  423         if (strnlen(din.ia_to, sizeof(din.ia_to)) >= ICONV_CSNMAXLEN)
  424                 return EINVAL;
  425         if (strnlen(din.ia_converter, sizeof(din.ia_converter)) >= ICONV_CNVNMAXLEN)
  426                 return EINVAL;
  427         if (iconv_lookupconv(din.ia_converter, &dcp) != 0)
  428                 return EINVAL;
  429         sx_xlock(&iconv_lock);
  430         error = iconv_register_cspair(din.ia_to, din.ia_from, dcp, NULL, &csp);
  431         if (error) {
  432                 sx_xunlock(&iconv_lock);
  433                 return error;
  434         }
  435         if (din.ia_datalen) {
  436                 csp->cp_data = malloc(din.ia_datalen, M_ICONVDATA, M_WAITOK);
  437                 error = copyin(din.ia_data, csp->cp_data, din.ia_datalen);
  438                 if (error)
  439                         goto bad;
  440         }
  441         dout.ia_csid = csp->cp_id;
  442         error = SYSCTL_OUT(req, &dout, sizeof(dout));
  443         if (error)
  444                 goto bad;
  445         sx_xunlock(&iconv_lock);
  446         ICDEBUG("%s => %s, %d bytes\n",din.ia_from, din.ia_to, din.ia_datalen);
  447         return 0;
  448 bad:
  449         iconv_unregister_cspair(csp);
  450         sx_xunlock(&iconv_lock);
  451         return error;
  452 }
  453 
  454 SYSCTL_PROC(_kern_iconv, OID_AUTO, add,
  455     CTLFLAG_RW | CTLTYPE_OPAQUE | CTLFLAG_MPSAFE, NULL, 0,
  456     iconv_sysctl_add, "S,xlat",
  457     "register charset pair");
  458 
  459 /*
  460  * Default stubs for converters
  461  */
  462 int
  463 iconv_converter_initstub(struct iconv_converter_class *dp)
  464 {
  465         return 0;
  466 }
  467 
  468 int
  469 iconv_converter_donestub(struct iconv_converter_class *dp)
  470 {
  471         return 0;
  472 }
  473 
  474 int
  475 iconv_converter_tolowerstub(int c, void *handle)
  476 {
  477         return (c);
  478 }
  479 
  480 int
  481 iconv_converter_handler(module_t mod, int type, void *data)
  482 {
  483         struct iconv_converter_class *dcp = data;
  484         int error;
  485 
  486         switch (type) {
  487             case MOD_LOAD:
  488                 sx_xlock(&iconv_lock);
  489                 error = iconv_register_converter(dcp);
  490                 if (error) {
  491                         sx_xunlock(&iconv_lock);
  492                         break;
  493                 }
  494                 error = ICONV_CONVERTER_INIT(dcp);
  495                 if (error)
  496                         iconv_unregister_converter(dcp);
  497                 sx_xunlock(&iconv_lock);
  498                 break;
  499             case MOD_UNLOAD:
  500                 sx_xlock(&iconv_lock);
  501                 ICONV_CONVERTER_DONE(dcp);
  502                 error = iconv_unregister_converter(dcp);
  503                 sx_xunlock(&iconv_lock);
  504                 break;
  505             default:
  506                 error = EINVAL;
  507         }
  508         return error;
  509 }
  510 
  511 /*
  512  * Common used functions (don't use with unicode)
  513  */
  514 char *
  515 iconv_convstr(void *handle, char *dst, const char *src)
  516 {
  517         char *p = dst;
  518         size_t inlen, outlen;
  519         int error;
  520 
  521         if (handle == NULL) {
  522                 strcpy(dst, src);
  523                 return dst;
  524         }
  525         inlen = outlen = strlen(src);
  526         error = iconv_conv(handle, NULL, NULL, &p, &outlen);
  527         if (error)
  528                 return NULL;
  529         error = iconv_conv(handle, &src, &inlen, &p, &outlen);
  530         if (error)
  531                 return NULL;
  532         *p = 0;
  533         return dst;
  534 }
  535 
  536 void *
  537 iconv_convmem(void *handle, void *dst, const void *src, int size)
  538 {
  539         const char *s = src;
  540         char *d = dst;
  541         size_t inlen, outlen;
  542         int error;
  543 
  544         if (size == 0)
  545                 return dst;
  546         if (handle == NULL) {
  547                 memcpy(dst, src, size);
  548                 return dst;
  549         }
  550         inlen = outlen = size;
  551         error = iconv_conv(handle, NULL, NULL, &d, &outlen);
  552         if (error)
  553                 return NULL;
  554         error = iconv_conv(handle, &s, &inlen, &d, &outlen);
  555         if (error)
  556                 return NULL;
  557         return dst;
  558 }
  559 
  560 int
  561 iconv_lookupcp(char **cpp, const char *s)
  562 {
  563         if (cpp == NULL) {
  564                 ICDEBUG("warning a NULL list passed\n", "");
  565                 return ENOENT;
  566         }
  567         for (; *cpp; cpp++)
  568                 if (strcmp(*cpp, s) == 0)
  569                         return 0;
  570         return ENOENT;
  571 }
  572 
  573 /*
  574  * Return if fsname is in use of not
  575  */
  576 int
  577 iconv_vfs_refcount(const char *fsname)
  578 {
  579         struct vfsconf *vfsp;
  580 
  581         vfsp = vfs_byname(fsname);
  582         if (vfsp != NULL && vfsp->vfc_refcount > 0)
  583                 return (EBUSY);
  584         return (0);
  585 }
Cache object: 944ac6098c1c7a355efae71f7464431f
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FreeBSD/Linux Kernel Cross Reference sys/libkern/iconv.c

FreeBSD/Linux Kernel Cross Reference
sys/libkern/iconv.c
