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|
/* dso_dlfcn.c -*- mode:C; c-file-style: "eay" -*- */
/*
* Written by Geoff Thorpe (geoff@geoffthorpe.net) 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
* licensing@OpenSSL.org.
*
* 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
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/*
* We need to do this early, because stdio.h includes the header files that
* handle _GNU_SOURCE and other similar macros. Defining it later is simply
* too late, because those headers are protected from re- inclusion.
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE /* make sure dladdr is declared */
#endif
#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
# ifdef __osf__
# define __EXTENSIONS__
# endif
# include <dlfcn.h>
# define HAVE_DLINFO 1
# if defined(_AIX) || defined(__CYGWIN__) || \
defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
(defined(__osf__) && !defined(RTLD_NEXT)) || \
(defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
defined(__ANDROID__)
# undef HAVE_DLINFO
# endif
# 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);
static char *dlfcn_name_converter(DSO *dso, const char *filename);
static char *dlfcn_merger(DSO *dso, const char *filespec1,
const char *filespec2);
static int dlfcn_pathbyaddr(void *addr, char *path, int sz);
static void *dlfcn_globallookup(const char *name);
static DSO_METHOD dso_meth_dlfcn = {
"OpenSSL 'dlfcn' shared library method",
dlfcn_load,
dlfcn_unload,
dlfcn_bind_var,
dlfcn_bind_func,
NULL, /* ctrl */
dlfcn_name_converter,
dlfcn_merger,
NULL, /* init */
NULL, /* finish */
dlfcn_pathbyaddr,
dlfcn_globallookup
};
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
# define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
# 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_void_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_void_num(dso->meth_data) < 1)
return (1);
ptr = sk_void_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_void_push(dso->meth_data, 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_void_num(dso->meth_data) < 1) {
DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_STACK_ERROR);
return (NULL);
}
ptr = sk_void_value(dso->meth_data, sk_void_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;
union {
DSO_FUNC_TYPE sym;
void *dlret;
} u;
if ((dso == NULL) || (symname == NULL)) {
DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
return (NULL);
}
if (sk_void_num(dso->meth_data) < 1) {
DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
return (NULL);
}
ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
if (ptr == NULL) {
DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
return (NULL);
}
u.dlret = dlsym(ptr, symname);
if (u.dlret == NULL) {
DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
return (NULL);
}
return u.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 != NULL && filespec1[0] == '/')) {
merged = OPENSSL_malloc(strlen(filespec1) + 1);
if (!merged)
|