freebsd-dev/lib/libc/iconv/citrus_iconv.c
Alexander Kabaev 3956b1013e Avoid lookup of CODESET aliases using uninitialized path
We do not use iconv.alias file, so avoid using the vestiges
of the code that do.

Differential Revision:	https://reviews.freebsd.org/D1729
Reviewed by: emaste
MFC after: 2 weeks
2015-02-28 20:30:25 +00:00

360 lines
8.6 KiB
C

/* $FreeBSD$ */
/* $NetBSD: citrus_iconv.c,v 1.10 2011/11/19 18:34:21 tnozaki Exp $ */
/*-
* Copyright (c)2003 Citrus Project,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <iconv.h>
#include <langinfo.h>
#include <limits.h>
#include <paths.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "citrus_namespace.h"
#include "citrus_bcs.h"
#include "citrus_esdb.h"
#include "citrus_region.h"
#include "citrus_memstream.h"
#include "citrus_mmap.h"
#include "citrus_module.h"
#include "citrus_lock.h"
#include "citrus_lookup.h"
#include "citrus_hash.h"
#include "citrus_iconv.h"
#define _CITRUS_ICONV_DIR "iconv.dir"
#define _CITRUS_ICONV_ALIAS "iconv.alias"
#define CI_HASH_SIZE 101
#define CI_INITIAL_MAX_REUSE 5
#define CI_ENV_MAX_REUSE "ICONV_MAX_REUSE"
static bool isinit = false;
static int shared_max_reuse, shared_num_unused;
static _CITRUS_HASH_HEAD(, _citrus_iconv_shared, CI_HASH_SIZE) shared_pool;
static TAILQ_HEAD(, _citrus_iconv_shared) shared_unused;
static pthread_rwlock_t ci_lock = PTHREAD_RWLOCK_INITIALIZER;
static __inline void
init_cache(void)
{
WLOCK(&ci_lock);
if (!isinit) {
_CITRUS_HASH_INIT(&shared_pool, CI_HASH_SIZE);
TAILQ_INIT(&shared_unused);
shared_max_reuse = -1;
if (!issetugid() && getenv(CI_ENV_MAX_REUSE))
shared_max_reuse = atoi(getenv(CI_ENV_MAX_REUSE));
if (shared_max_reuse < 0)
shared_max_reuse = CI_INITIAL_MAX_REUSE;
isinit = true;
}
UNLOCK(&ci_lock);
}
static __inline void
close_shared(struct _citrus_iconv_shared *ci)
{
if (ci) {
if (ci->ci_module) {
if (ci->ci_ops) {
if (ci->ci_closure)
(*ci->ci_ops->io_uninit_shared)(ci);
free(ci->ci_ops);
}
_citrus_unload_module(ci->ci_module);
}
free(ci);
}
}
static __inline int
open_shared(struct _citrus_iconv_shared * __restrict * __restrict rci,
const char * __restrict convname, const char * __restrict src,
const char * __restrict dst)
{
struct _citrus_iconv_shared *ci;
_citrus_iconv_getops_t getops;
const char *module;
size_t len_convname;
int ret;
#ifdef INCOMPATIBLE_WITH_GNU_ICONV
/*
* Sadly, the gnu tools expect iconv to actually parse the
* byte stream and don't allow for a pass-through when
* the (src,dest) encodings are the same.
* See gettext-0.18.3+ NEWS:
* msgfmt now checks PO file headers more strictly with less
* false-positives.
* NetBSD don't do this either.
*/
module = (strcmp(src, dst) != 0) ? "iconv_std" : "iconv_none";
#else
module = "iconv_std";
#endif
/* initialize iconv handle */
len_convname = strlen(convname);
ci = malloc(sizeof(*ci) + len_convname + 1);
if (!ci) {
ret = errno;
goto err;
}
ci->ci_module = NULL;
ci->ci_ops = NULL;
ci->ci_closure = NULL;
ci->ci_convname = (void *)&ci[1];
memcpy(ci->ci_convname, convname, len_convname + 1);
/* load module */
ret = _citrus_load_module(&ci->ci_module, module);
if (ret)
goto err;
/* get operators */
getops = (_citrus_iconv_getops_t)_citrus_find_getops(ci->ci_module,
module, "iconv");
if (!getops) {
ret = EOPNOTSUPP;
goto err;
}
ci->ci_ops = malloc(sizeof(*ci->ci_ops));
if (!ci->ci_ops) {
ret = errno;
goto err;
}
ret = (*getops)(ci->ci_ops);
if (ret)
goto err;
if (ci->ci_ops->io_init_shared == NULL ||
ci->ci_ops->io_uninit_shared == NULL ||
ci->ci_ops->io_init_context == NULL ||
ci->ci_ops->io_uninit_context == NULL ||
ci->ci_ops->io_convert == NULL) {
ret = EINVAL;
goto err;
}
/* initialize the converter */
ret = (*ci->ci_ops->io_init_shared)(ci, src, dst);
if (ret)
goto err;
*rci = ci;
return (0);
err:
close_shared(ci);
return (ret);
}
static __inline int
hash_func(const char *key)
{
return (_string_hash_func(key, CI_HASH_SIZE));
}
static __inline int
match_func(struct _citrus_iconv_shared * __restrict ci,
const char * __restrict key)
{
return (strcmp(ci->ci_convname, key));
}
static int
get_shared(struct _citrus_iconv_shared * __restrict * __restrict rci,
const char *src, const char *dst)
{
struct _citrus_iconv_shared * ci;
char convname[PATH_MAX];
int hashval, ret = 0;
snprintf(convname, sizeof(convname), "%s/%s", src, dst);
WLOCK(&ci_lock);
/* lookup alread existing entry */
hashval = hash_func(convname);
_CITRUS_HASH_SEARCH(&shared_pool, ci, ci_hash_entry, match_func,
convname, hashval);
if (ci != NULL) {
/* found */
if (ci->ci_used_count == 0) {
TAILQ_REMOVE(&shared_unused, ci, ci_tailq_entry);
shared_num_unused--;
}
ci->ci_used_count++;
*rci = ci;
goto quit;
}
/* create new entry */
ret = open_shared(&ci, convname, src, dst);
if (ret)
goto quit;
_CITRUS_HASH_INSERT(&shared_pool, ci, ci_hash_entry, hashval);
ci->ci_used_count = 1;
*rci = ci;
quit:
UNLOCK(&ci_lock);
return (ret);
}
static void
release_shared(struct _citrus_iconv_shared * __restrict ci)
{
WLOCK(&ci_lock);
ci->ci_used_count--;
if (ci->ci_used_count == 0) {
/* put it into unused list */
shared_num_unused++;
TAILQ_INSERT_TAIL(&shared_unused, ci, ci_tailq_entry);
/* flood out */
while (shared_num_unused > shared_max_reuse) {
ci = TAILQ_FIRST(&shared_unused);
TAILQ_REMOVE(&shared_unused, ci, ci_tailq_entry);
_CITRUS_HASH_REMOVE(ci, ci_hash_entry);
shared_num_unused--;
close_shared(ci);
}
}
UNLOCK(&ci_lock);
}
/*
* _citrus_iconv_open:
* open a converter for the specified in/out codes.
*/
int
_citrus_iconv_open(struct _citrus_iconv * __restrict * __restrict rcv,
const char * __restrict src, const char * __restrict dst)
{
struct _citrus_iconv *cv = NULL;
struct _citrus_iconv_shared *ci = NULL;
char realdst[PATH_MAX], realsrc[PATH_MAX];
#ifdef _PATH_ICONV
char buf[PATH_MAX], path[PATH_MAX];
#endif
int ret;
init_cache();
/* GNU behaviour, using locale encoding if "" or "char" is specified */
if ((strcmp(src, "") == 0) || (strcmp(src, "char") == 0))
src = nl_langinfo(CODESET);
if ((strcmp(dst, "") == 0) || (strcmp(dst, "char") == 0))
dst = nl_langinfo(CODESET);
/* resolve codeset name aliases */
#ifdef _PATH_ICONV
snprintf(path, sizeof(path), "%s/%s", _PATH_ICONV, _CITRUS_ICONV_ALIAS);
strlcpy(realsrc, _lookup_alias(path, src, buf, (size_t)PATH_MAX,
_LOOKUP_CASE_IGNORE), (size_t)PATH_MAX);
strlcpy(realdst, _lookup_alias(path, dst, buf, (size_t)PATH_MAX,
_LOOKUP_CASE_IGNORE), (size_t)PATH_MAX);
#else
strlcpy(realsrc, src, (size_t)PATH_MAX);
strlcpy(realdst, dst, (size_t)PATH_MAX);
#endif
/* sanity check */
if (strchr(realsrc, '/') != NULL || strchr(realdst, '/'))
return (EINVAL);
/* get shared record */
ret = get_shared(&ci, realsrc, realdst);
if (ret)
return (ret);
/* create/init context */
if (*rcv == NULL) {
cv = malloc(sizeof(*cv));
if (cv == NULL) {
ret = errno;
release_shared(ci);
return (ret);
}
*rcv = cv;
}
(*rcv)->cv_shared = ci;
ret = (*ci->ci_ops->io_init_context)(*rcv);
if (ret) {
release_shared(ci);
free(cv);
return (ret);
}
return (0);
}
/*
* _citrus_iconv_close:
* close the specified converter.
*/
void
_citrus_iconv_close(struct _citrus_iconv *cv)
{
if (cv) {
(*cv->cv_shared->ci_ops->io_uninit_context)(cv);
release_shared(cv->cv_shared);
free(cv);
}
}
const char
*_citrus_iconv_canonicalize(const char *name)
{
char *buf;
if ((buf = calloc((size_t)PATH_MAX, sizeof(*buf))) == NULL)
return (NULL);
_citrus_esdb_alias(name, buf, (size_t)PATH_MAX);
return (buf);
}