354 lines
9.1 KiB
C
354 lines
9.1 KiB
C
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/* $OpenBSD: dso_dlfcn.c,v 1.29 2017/01/29 17:49:23 beck Exp $ */
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/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
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* project 2000.
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*/
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/* ====================================================================
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* Copyright (c) 2000 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <openssl/dso.h>
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#include <openssl/err.h>
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#ifndef DSO_DLFCN
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DSO_METHOD *
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DSO_METHOD_dlfcn(void)
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{
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return NULL;
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}
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#else
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#ifdef HAVE_DLFCN_H
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# include <dlfcn.h>
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# define HAVE_DLINFO 1
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#endif
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/* Part of the hack in "dlfcn_load" ... */
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#define DSO_MAX_TRANSLATED_SIZE 256
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static int dlfcn_load(DSO *dso);
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static int dlfcn_unload(DSO *dso);
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static void *dlfcn_bind_var(DSO *dso, const char *symname);
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static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
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static char *dlfcn_name_converter(DSO *dso, const char *filename);
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static char *dlfcn_merger(DSO *dso, const char *filespec1,
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const char *filespec2);
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static int dlfcn_pathbyaddr(void *addr, char *path, int sz);
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static void *dlfcn_globallookup(const char *name);
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static DSO_METHOD dso_meth_dlfcn = {
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.name = "OpenSSL 'dlfcn' shared library method",
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.dso_load = dlfcn_load,
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.dso_unload = dlfcn_unload,
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.dso_bind_var = dlfcn_bind_var,
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.dso_bind_func = dlfcn_bind_func,
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.dso_name_converter = dlfcn_name_converter,
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.dso_merger = dlfcn_merger,
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.pathbyaddr = dlfcn_pathbyaddr,
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.globallookup = dlfcn_globallookup
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};
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DSO_METHOD *
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DSO_METHOD_dlfcn(void)
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{
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return (&dso_meth_dlfcn);
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}
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/* For this DSO_METHOD, our meth_data STACK will contain;
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* (i) the handle (void*) returned from dlopen().
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*/
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static int
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dlfcn_load(DSO *dso)
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{
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void *ptr = NULL;
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/* See applicable comments in dso_dl.c */
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char *filename = DSO_convert_filename(dso, NULL);
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int flags = RTLD_LAZY;
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if (filename == NULL) {
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DSOerror(DSO_R_NO_FILENAME);
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goto err;
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}
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if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
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flags |= RTLD_GLOBAL;
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ptr = dlopen(filename, flags);
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if (ptr == NULL) {
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DSOerror(DSO_R_LOAD_FAILED);
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ERR_asprintf_error_data("filename(%s): %s", filename,
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dlerror());
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goto err;
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}
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if (!sk_void_push(dso->meth_data, (char *)ptr)) {
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DSOerror(DSO_R_STACK_ERROR);
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goto err;
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}
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/* Success */
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dso->loaded_filename = filename;
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return (1);
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err:
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/* Cleanup! */
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free(filename);
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if (ptr != NULL)
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dlclose(ptr);
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return (0);
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}
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static int
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dlfcn_unload(DSO *dso)
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{
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void *ptr;
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if (dso == NULL) {
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DSOerror(ERR_R_PASSED_NULL_PARAMETER);
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return (0);
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}
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if (sk_void_num(dso->meth_data) < 1)
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return (1);
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ptr = sk_void_pop(dso->meth_data);
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if (ptr == NULL) {
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DSOerror(DSO_R_NULL_HANDLE);
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/* Should push the value back onto the stack in
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* case of a retry. */
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sk_void_push(dso->meth_data, ptr);
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return (0);
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}
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/* For now I'm not aware of any errors associated with dlclose() */
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dlclose(ptr);
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return (1);
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}
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static void *
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dlfcn_bind_var(DSO *dso, const char *symname)
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{
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void *ptr, *sym;
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if ((dso == NULL) || (symname == NULL)) {
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DSOerror(ERR_R_PASSED_NULL_PARAMETER);
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return (NULL);
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}
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if (sk_void_num(dso->meth_data) < 1) {
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DSOerror(DSO_R_STACK_ERROR);
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return (NULL);
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}
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ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
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if (ptr == NULL) {
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DSOerror(DSO_R_NULL_HANDLE);
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return (NULL);
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}
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sym = dlsym(ptr, symname);
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if (sym == NULL) {
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DSOerror(DSO_R_SYM_FAILURE);
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ERR_asprintf_error_data("symname(%s): %s", symname, dlerror());
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return (NULL);
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}
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return (sym);
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}
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static DSO_FUNC_TYPE
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dlfcn_bind_func(DSO *dso, const char *symname)
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{
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void *ptr;
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union {
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DSO_FUNC_TYPE sym;
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void *dlret;
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} u;
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if ((dso == NULL) || (symname == NULL)) {
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DSOerror(ERR_R_PASSED_NULL_PARAMETER);
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return (NULL);
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}
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if (sk_void_num(dso->meth_data) < 1) {
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DSOerror(DSO_R_STACK_ERROR);
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return (NULL);
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}
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ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
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if (ptr == NULL) {
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DSOerror(DSO_R_NULL_HANDLE);
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return (NULL);
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}
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u.dlret = dlsym(ptr, symname);
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if (u.dlret == NULL) {
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DSOerror(DSO_R_SYM_FAILURE);
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ERR_asprintf_error_data("symname(%s): %s", symname, dlerror());
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return (NULL);
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}
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return u.sym;
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}
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static char *
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dlfcn_merger(DSO *dso, const char *filespec1, const char *filespec2)
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{
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char *merged;
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if (!filespec1 && !filespec2) {
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DSOerror(ERR_R_PASSED_NULL_PARAMETER);
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return (NULL);
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}
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/* If the first file specification is a rooted path, it rules.
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same goes if the second file specification is missing. */
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if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
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merged = strdup(filespec1);
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if (!merged) {
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DSOerror(ERR_R_MALLOC_FAILURE);
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return (NULL);
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}
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}
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/* If the first file specification is missing, the second one rules. */
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else if (!filespec1) {
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merged = strdup(filespec2);
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if (!merged) {
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DSOerror(ERR_R_MALLOC_FAILURE);
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return (NULL);
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}
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} else
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/* This part isn't as trivial as it looks. It assumes that
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the second file specification really is a directory, and
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makes no checks whatsoever. Therefore, the result becomes
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the concatenation of filespec2 followed by a slash followed
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by filespec1. */
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{
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size_t spec2len, len;
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spec2len = strlen(filespec2);
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len = spec2len + (filespec1 ? strlen(filespec1) : 0);
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if (filespec2 && filespec2[spec2len - 1] == '/') {
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spec2len--;
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len--;
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}
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merged = malloc(len + 2);
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if (!merged) {
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DSOerror(ERR_R_MALLOC_FAILURE);
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return (NULL);
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}
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strlcpy(merged, filespec2, len + 2);
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merged[spec2len] = '/';
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strlcpy(&merged[spec2len + 1], filespec1, len + 1 - spec2len);
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}
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return (merged);
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}
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#define DSO_ext ".so"
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#define DSO_extlen 3
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static char *
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dlfcn_name_converter(DSO *dso, const char *filename)
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{
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char *translated;
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int ret;
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if (strchr(filename, '/') == NULL) {
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/* Bare name, so convert to "%s.so" or "lib%s.so" */
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if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
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ret = asprintf(&translated, "lib%s" DSO_ext, filename);
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else
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ret = asprintf(&translated, "%s" DSO_ext, filename);
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if (ret == -1)
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translated = NULL;
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} else {
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/* Full path, so just duplicate it */
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translated = strdup(filename);
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}
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if (translated == NULL)
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DSOerror(DSO_R_NAME_TRANSLATION_FAILED);
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return (translated);
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}
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static int
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dlfcn_pathbyaddr(void *addr, char *path, int sz)
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{
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Dl_info dli;
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int len;
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if (addr == NULL) {
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union{
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int(*f)(void*, char*, int);
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void *p;
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} t = { dlfcn_pathbyaddr };
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addr = t.p;
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}
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if (dladdr(addr, &dli)) {
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len = (int)strlen(dli.dli_fname);
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if (sz <= 0)
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return len + 1;
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if (len >= sz)
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len = sz - 1;
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memcpy(path, dli.dli_fname, len);
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path[len++] = 0;
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return len;
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}
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ERR_asprintf_error_data("dlfcn_pathbyaddr(): %s", dlerror());
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return -1;
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}
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static void *
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dlfcn_globallookup(const char *name)
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{
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void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
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if (handle) {
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ret = dlsym(handle, name);
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dlclose(handle);
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}
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return ret;
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}
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#endif /* DSO_DLFCN */
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