ref: 63f9a4fda36f916e543c8f3ea117b31c194a4db7
dir: /sys/src/ape/lib/openssl/crypto/dso/dso_dlfcn.c/
/* dso_dlfcn.c -*- mode:C; c-file-style: "eay" -*- */
/* Written by Geoff Thorpe ([email protected]) for the OpenSSL
* project 2000.
*/
/* ====================================================================
* Copyright (c) 2000 The OpenSSL 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.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* [email protected].
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* ([email protected]). This product includes software written by Tim
* Hudson ([email protected]).
*
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/dso.h>
#ifndef DSO_DLFCN
DSO_METHOD *DSO_METHOD_dlfcn(void)
{
return NULL;
}
#else
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
/* Part of the hack in "dlfcn_load" ... */
#define DSO_MAX_TRANSLATED_SIZE 256
static int dlfcn_load(DSO *dso);
static int dlfcn_unload(DSO *dso);
static void *dlfcn_bind_var(DSO *dso, const char *symname);
static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
#if 0
static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
static int dlfcn_init(DSO *dso);
static int dlfcn_finish(DSO *dso);
static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
#endif
static char *dlfcn_name_converter(DSO *dso, const char *filename);
static char *dlfcn_merger(DSO *dso, const char *filespec1,
const char *filespec2);
static DSO_METHOD dso_meth_dlfcn = {
"OpenSSL 'dlfcn' shared library method",
dlfcn_load,
dlfcn_unload,
dlfcn_bind_var,
dlfcn_bind_func,
/* For now, "unbind" doesn't exist */
#if 0
NULL, /* unbind_var */
NULL, /* unbind_func */
#endif
NULL, /* ctrl */
dlfcn_name_converter,
dlfcn_merger,
NULL, /* init */
NULL /* finish */
};
DSO_METHOD *DSO_METHOD_dlfcn(void)
{
return(&dso_meth_dlfcn);
}
/* Prior to using the dlopen() function, we should decide on the flag
* we send. There's a few different ways of doing this and it's a
* messy venn-diagram to match up which platforms support what. So
* as we don't have autoconf yet, I'm implementing a hack that could
* be hacked further relatively easily to deal with cases as we find
* them. Initially this is to cope with OpenBSD. */
#if defined(__OpenBSD__) || defined(__NetBSD__)
# ifdef DL_LAZY
# define DLOPEN_FLAG DL_LAZY
# else
# ifdef RTLD_NOW
# define DLOPEN_FLAG RTLD_NOW
# else
# define DLOPEN_FLAG 0
# endif
# endif
#else
# ifdef OPENSSL_SYS_SUNOS
# define DLOPEN_FLAG 1
# else
# define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
# endif
#endif
/* For this DSO_METHOD, our meth_data STACK will contain;
* (i) the handle (void*) returned from dlopen().
*/
static int dlfcn_load(DSO *dso)
{
void *ptr = NULL;
/* See applicable comments in dso_dl.c */
char *filename = DSO_convert_filename(dso, NULL);
int flags = DLOPEN_FLAG;
if(filename == NULL)
{
DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
goto err;
}
#ifdef RTLD_GLOBAL
if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
flags |= RTLD_GLOBAL;
#endif
ptr = dlopen(filename, flags);
if(ptr == NULL)
{
DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
goto err;
}
if(!sk_push(dso->meth_data, (char *)ptr))
{
DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
goto err;
}
/* Success */
dso->loaded_filename = filename;
return(1);
err:
/* Cleanup! */
if(filename != NULL)
OPENSSL_free(filename);
if(ptr != NULL)
dlclose(ptr);
return(0);
}
static int dlfcn_unload(DSO *dso)
{
void *ptr;
if(dso == NULL)
{
DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
return(0);
}
if(sk_num(dso->meth_data) < 1)
return(1);
ptr = (void *)sk_pop(dso->meth_data);
if(ptr == NULL)
{
DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
/* Should push the value back onto the stack in
* case of a retry. */
sk_push(dso->meth_data, (char *)ptr);
return(0);
}
/* For now I'm not aware of any errors associated with dlclose() */
dlclose(ptr);
return(1);
}
static void *dlfcn_bind_var(DSO *dso, const char *symname)
{
void *ptr, *sym;
if((dso == NULL) || (symname == NULL))
{
DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
return(NULL);
}
if(sk_num(dso->meth_data) < 1)
{
DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
return(NULL);
}
ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
if(ptr == NULL)
{
DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
return(NULL);
}
sym = dlsym(ptr, symname);
if(sym == NULL)
{
DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
return(NULL);
}
return(sym);
}
static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
{
void *ptr;
DSO_FUNC_TYPE sym, *tsym = &sym;
if((dso == NULL) || (symname == NULL))
{
DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
return(NULL);
}
if(sk_num(dso->meth_data) < 1)
{
DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
return(NULL);
}
ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
if(ptr == NULL)
{
DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
return(NULL);
}
*(void **)(tsym) = dlsym(ptr, symname);
if(sym == NULL)
{
DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
return(NULL);
}
return(sym);
}
static char *dlfcn_merger(DSO *dso, const char *filespec1,
const char *filespec2)
{
char *merged;
if(!filespec1 && !filespec2)
{
DSOerr(DSO_F_DLFCN_MERGER,
ERR_R_PASSED_NULL_PARAMETER);
return(NULL);
}
/* If the first file specification is a rooted path, it rules.
same goes if the second file specification is missing. */
if (!filespec2 || filespec1[0] == '/')
{
merged = OPENSSL_malloc(strlen(filespec1) + 1);
if(!merged)
{
DSOerr(DSO_F_DLFCN_MERGER,
ERR_R_MALLOC_FAILURE);
return(NULL);
}
strcpy(merged, filespec1);
}
/* If the first file specification is missing, the second one rules. */
else if (!filespec1)
{
merged = OPENSSL_malloc(strlen(filespec2) + 1);
if(!merged)
{
DSOerr(DSO_F_DLFCN_MERGER,
ERR_R_MALLOC_FAILURE);
return(NULL);
}
strcpy(merged, filespec2);
}
else
/* This part isn't as trivial as it looks. It assumes that
the second file specification really is a directory, and
makes no checks whatsoever. Therefore, the result becomes
the concatenation of filespec2 followed by a slash followed
by filespec1. */
{
int spec2len, len;
spec2len = (filespec2 ? strlen(filespec2) : 0);
len = spec2len + (filespec1 ? strlen(filespec1) : 0);
if(filespec2 && filespec2[spec2len - 1] == '/')
{
spec2len--;
len--;
}
merged = OPENSSL_malloc(len + 2);
if(!merged)
{
DSOerr(DSO_F_DLFCN_MERGER,
ERR_R_MALLOC_FAILURE);
return(NULL);
}
strcpy(merged, filespec2);
merged[spec2len] = '/';
strcpy(&merged[spec2len + 1], filespec1);
}
return(merged);
}
static char *dlfcn_name_converter(DSO *dso, const char *filename)
{
char *translated;
int len, rsize, transform;
len = strlen(filename);
rsize = len + 1;
transform = (strstr(filename, "/") == NULL);
if(transform)
{
/* We will convert this to "%s.so" or "lib%s.so" */
rsize += 3; /* The length of ".so" */
if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
rsize += 3; /* The length of "lib" */
}
translated = OPENSSL_malloc(rsize);
if(translated == NULL)
{
DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
DSO_R_NAME_TRANSLATION_FAILED);
return(NULL);
}
if(transform)
{
if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
sprintf(translated, "lib%s.so", filename);
else
sprintf(translated, "%s.so", filename);
}
else
sprintf(translated, "%s", filename);
return(translated);
}
#endif /* DSO_DLFCN */