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| Current File : //compat/linux/proc/self/root/usr/src/lib/libc/iconv/citrus_module.c |
/* $FreeBSD: release/9.1.0/lib/libc/iconv/citrus_module.c 228843 2011-12-23 15:00:37Z cperciva $ */
/* $NetBSD: citrus_module.c,v 1.9 2009/01/11 02:46:24 christos Exp $ */
/*-
* Copyright (c)1999, 2000, 2001, 2002 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.
*/
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*-
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Paul Borman at Krystal Technologies.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <assert.h>
#include <dirent.h>
#include <dlfcn.h>
#include <errno.h>
#include <limits.h>
#include <paths.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define I18NMODULE_MAJOR 4
#include "citrus_namespace.h"
#include "citrus_bcs.h"
#include "citrus_module.h"
#include "libc_private.h"
static int _getdewey(int[], char *);
static int _cmpndewey(int[], int, int[], int);
static const char *_findshlib(char *, int *, int *);
static const char *_pathI18nModule = NULL;
/* from libexec/ld.aout_so/shlib.c */
#undef major
#undef minor
#define MAXDEWEY 3 /*ELF*/
static int
_getdewey(int dewey[], char *cp)
{
int i, n;
for (n = 0, i = 0; i < MAXDEWEY; i++) {
if (*cp == '\0')
break;
if (*cp == '.') cp++;
if (*cp < '0' || '9' < *cp)
return (0);
dewey[n++] = (int)_bcs_strtol(cp, &cp, 10);
}
return (n);
}
/*
* Compare two dewey arrays.
* Return -1 if `d1' represents a smaller value than `d2'.
* Return 1 if `d1' represents a greater value than `d2'.
* Return 0 if equal.
*/
static int
_cmpndewey(int d1[], int n1, int d2[], int n2)
{
int i;
for (i = 0; i < n1 && i < n2; i++) {
if (d1[i] < d2[i])
return (-1);
if (d1[i] > d2[i])
return (1);
}
if (n1 == n2)
return (0);
if (i == n1)
return (-1);
if (i == n2)
return (1);
/* cannot happen */
return (0);
}
static const char *
_findshlib(char *name, int *majorp, int *minorp)
{
char *lname;
const char *search_dirs[1];
static char path[PATH_MAX];
int dewey[MAXDEWEY], tmp[MAXDEWEY];
int i, len, major, minor, ndewey, n_search_dirs;
n_search_dirs = 1;
major = *majorp;
minor = *minorp;
path[0] = '\0';
search_dirs[0] = _pathI18nModule;
len = strlen(name);
lname = name;
ndewey = 0;
for (i = 0; i < n_search_dirs; i++) {
struct dirent *dp;
DIR *dd = opendir(search_dirs[i]);
int found_dot_a = 0, found_dot_so = 0;
if (dd == NULL)
break;
while ((dp = readdir(dd)) != NULL) {
int n;
if (dp->d_namlen < len + 4)
continue;
if (strncmp(dp->d_name, lname, (size_t)len) != 0)
continue;
if (strncmp(dp->d_name+len, ".so.", 4) != 0)
continue;
if ((n = _getdewey(tmp, dp->d_name+len+4)) == 0)
continue;
if (major != -1 && found_dot_a)
found_dot_a = 0;
/* XXX should verify the library is a.out/ELF? */
if (major == -1 && minor == -1)
goto compare_version;
else if (major != -1 && minor == -1) {
if (tmp[0] == major)
goto compare_version;
} else if (major != -1 && minor != -1) {
if (tmp[0] == major) {
if (n == 1 || tmp[1] >= minor)
goto compare_version;
}
}
/* else, this file does not qualify */
continue;
compare_version:
if (_cmpndewey(tmp, n, dewey, ndewey) <= 0)
continue;
/* We have a better version */
found_dot_so = 1;
snprintf(path, sizeof(path), "%s/%s", search_dirs[i],
dp->d_name);
found_dot_a = 0;
bcopy(tmp, dewey, sizeof(dewey));
ndewey = n;
*majorp = dewey[0];
*minorp = dewey[1];
}
closedir(dd);
if (found_dot_a || found_dot_so)
/*
* There's a lib in this dir; take it.
*/
return (path[0] ? path : NULL);
}
return (path[0] ? path : NULL);
}
void *
_citrus_find_getops(_citrus_module_t handle, const char *modname,
const char *ifname)
{
char name[PATH_MAX];
void *p;
snprintf(name, sizeof(name), "_citrus_%s_%s_getops",
modname, ifname);
p = dlsym((void *)handle, name);
return (p);
}
int
_citrus_load_module(_citrus_module_t *rhandle, const char *encname)
{
const char *p;
char path[PATH_MAX];
void *handle;
int maj, min;
if (_pathI18nModule == NULL) {
p = getenv("PATH_I18NMODULE");
if (p != NULL && !issetugid()) {
_pathI18nModule = strdup(p);
if (_pathI18nModule == NULL)
return (ENOMEM);
} else
_pathI18nModule = _PATH_I18NMODULE;
}
(void)snprintf(path, sizeof(path), "lib%s", encname);
maj = I18NMODULE_MAJOR;
min = -1;
p = _findshlib(path, &maj, &min);
if (!p)
return (EINVAL);
handle = libc_dlopen(p, RTLD_LAZY);
if (!handle) {
printf("%s", dlerror());
return (EINVAL);
}
*rhandle = (_citrus_module_t)handle;
return (0);
}
void
_citrus_unload_module(_citrus_module_t handle)
{
if (handle)
dlclose((void *)handle);
}