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/* $OpenBSD: dso_dlfcn.c,v 1.29 2017/01/29 17:49:23 beck Exp $ */
/* 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).
*
*/
#include <stdio.h>
#include <string.h>
#include <openssl/dso.h>
#include <openssl/err.h>
#ifndef DSO_DLFCN
DSO_METHOD *
DSO_METHOD_dlfcn(void)
{
return NULL;
}
#else
#ifdef HAVE_DLFCN_H
# include <dlfcn.h>
# define HAVE_DLINFO 1
#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 = {
.name = "OpenSSL 'dlfcn' shared library method",
.dso_load = dlfcn_load,
.dso_unload = dlfcn_unload,
.dso_bind_var = dlfcn_bind_var,
.dso_bind_func = dlfcn_bind_func,
.dso_name_converter = dlfcn_name_converter,
.dso_merger = dlfcn_merger,
.pathbyaddr = dlfcn_pathbyaddr,
.globallookup = dlfcn_globallookup
};
DSO_METHOD *
DSO_METHOD_dlfcn(void)
{
return (&dso_meth_dlfcn);
}
/* 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 = RTLD_LAZY;
if (filename == NULL) {
DSOerror(DSO_R_NO_FILENAME);
goto err;
}
if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
flags |= RTLD_GLOBAL;
ptr = dlopen(filename, flags);
if (ptr == NULL) {
DSOerror(DSO_R_LOAD_FAILED);
ERR_asprintf_error_data("filename(%s): %s", filename,
dlerror());
goto err;
}
if (!sk_void_push(dso->meth_data, (char *)ptr)) {
DSOerror(DSO_R_STACK_ERROR);
goto err;
}
/* Success */
dso->loaded_filename = filename;
return (1);
err:
/* Cleanup! */
free(filename);
if (ptr != NULL)
dlclose(ptr);
return (0);
}
static int
dlfcn_unload(DSO *dso)
{
void *ptr;
if (dso == NULL) {
DSOerror(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) {
DSOerror(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)) {
DSOerror(ERR_R_PASSED_NULL_PARAMETER);
return (NULL);
}
if (sk_void_num(dso->meth_data) < 1) {
DSOerror(DSO_R_STACK_ERROR);
return (NULL);
}
ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
if (ptr == NULL) {
DSOerror(DSO_R_NULL_HANDLE);
return (NULL);
}
sym = dlsym(ptr, symname);
if (sym == NULL) {
DSOerror(DSO_R_SYM_FAILURE);
ERR_asprintf_error_data("symname(%s): %s", 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)) {
DSOerror(ERR_R_PASSED_NULL_PARAMETER);
return (NULL);
}
if (sk_void_num(dso->meth_data) < 1) {
DSOerror(DSO_R_STACK_ERROR);
return (NULL);
}
ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
if (ptr == NULL) {
DSOerror(DSO_R_NULL_HANDLE);
return (NULL);
}
u.dlret = dlsym(ptr, symname);
if (u.dlret == NULL) {
DSOerror(DSO_R_SYM_FAILURE);
ERR_asprintf_error_data("symname(%s): %s", symname, dlerror());
return (NULL);
}
return u.sym;
}
static char *
dlfcn_merger(DSO *dso, const char *filespec1, const char *filespec2)
{
char *merged;
if (!filespec1 && !filespec2) {
DSOerror(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 = strdup(filespec1);
if (!merged) {
DSOerror(ERR_R_MALLOC_FAILURE);
return (NULL);
}
}
/* If the first file specification is missing, the second one rules. */
else if (!filespec1) {
merged = strdup(filespec2);
if (!merged) {
DSOerror(ERR_R_MALLOC_FAILURE);
return (NULL);
}
} 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. */
{
size_t spec2len, len;
spec2len = strlen(filespec2);
len = spec2len + (filespec1 ? strlen(filespec1) : 0);
if (filespec2 && filespec2[spec2len - 1] == '/') {
spec2len--;
len--;
}
merged = malloc(len + 2);
if (!merged) {
DSOerror(ERR_R_MALLOC_FAILURE);
return (NULL);
}
strlcpy(merged, filespec2, len + 2);
merged[spec2len] = '/';
strlcpy(&merged[spec2len + 1], filespec1, len + 1 - spec2len);
}
return (merged);
}
#define DSO_ext ".so"
#define DSO_extlen 3
static char *
dlfcn_name_converter(DSO *dso, const char *filename)
{
char *translated;
int ret;
if (strchr(filename, '/') == NULL) {
/* Bare name, so convert to "%s.so" or "lib%s.so" */
if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
ret = asprintf(&translated, "lib%s" DSO_ext, filename);
else
ret = asprintf(&translated, "%s" DSO_ext, filename);
if (ret == -1)
translated = NULL;
} else {
/* Full path, so just duplicate it */
translated = strdup(filename);
}
if (translated == NULL)
DSOerror(DSO_R_NAME_TRANSLATION_FAILED);
return (translated);
}
static int
dlfcn_pathbyaddr(void *addr, char *path, int sz)
{
Dl_info dli;
int len;
if (addr == NULL) {
union{
int(*f)(void*, char*, int);
void *p;
} t = { dlfcn_pathbyaddr };
addr = t.p;
}
if (dladdr(addr, &dli)) {
len = (int)strlen(dli.dli_fname);
if (sz <= 0)
return len + 1;
if (len >= sz)
len = sz - 1;
memcpy(path, dli.dli_fname, len);
path[len++] = 0;
return len;
}
ERR_asprintf_error_data("dlfcn_pathbyaddr(): %s", dlerror());
return -1;
}
static void *
dlfcn_globallookup(const char *name)
{
void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
if (handle) {
ret = dlsym(handle, name);
dlclose(handle);
}
return ret;
}
#endif /* DSO_DLFCN */
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