ebbaebf784
if a DSO_load(NULL,...) operation fails, it will have to call DSO_free() on the DSO structure it created and that will filter through to this "unload" call. If the stack size is "< 1", then the library never actually loaded. To keep things clean higher up, I'll treat this as a vacuous case without an error. It makes the error stack easier to follow real world cases, and the error this ignores was only useful for catching bugs in internal code, not mismatched calls from applications (which should be handled in the generic DSO layer).
224 lines
6.1 KiB
C
224 lines
6.1 KiB
C
/* dso_dlfcn.c */
|
|
/* 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 "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, const char *filename);
|
|
static int dlfcn_unload(DSO *dso);
|
|
static int dlfcn_bind(DSO *dso, const char *symname, void **symptr);
|
|
#if 0
|
|
static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
|
|
static int dlfcn_init(DSO *dso);
|
|
static int dlfcn_finish(DSO *dso);
|
|
#endif
|
|
static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
|
|
|
|
static DSO_METHOD dso_meth_dlfcn = {
|
|
"OpenSSL 'dlfcn' shared library method",
|
|
dlfcn_load,
|
|
dlfcn_unload,
|
|
dlfcn_bind,
|
|
/* For now, "unbind" doesn't exist */
|
|
#if 0
|
|
NULL, /* unbind */
|
|
#endif
|
|
dlfcn_ctrl,
|
|
NULL, /* init */
|
|
NULL /* finish */
|
|
};
|
|
|
|
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, const char *filename)
|
|
{
|
|
void *ptr;
|
|
char translated[DSO_MAX_TRANSLATED_SIZE];
|
|
int len;
|
|
|
|
/* NB: This is a hideous hack, but I'm not yet sure what
|
|
* to replace it with. This attempts to convert any filename,
|
|
* that looks like it has no path information, into a
|
|
* translated form, e. "blah" -> "libblah.so" */
|
|
len = strlen(filename);
|
|
if((dso->flags & DSO_FLAG_NAME_TRANSLATION) &&
|
|
(len + 6 < DSO_MAX_TRANSLATED_SIZE) &&
|
|
(strstr(filename, "/") == NULL))
|
|
{
|
|
sprintf(translated, "lib%s.so", filename);
|
|
ptr = dlopen(translated, RTLD_NOW);
|
|
}
|
|
else
|
|
{
|
|
ptr = dlopen(filename, RTLD_NOW);
|
|
}
|
|
if(ptr == NULL)
|
|
{
|
|
DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
|
|
return(0);
|
|
}
|
|
if(!sk_push(dso->meth_data, (char *)ptr))
|
|
{
|
|
DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
|
|
dlclose(ptr);
|
|
return(0);
|
|
}
|
|
return(1);
|
|
}
|
|
|
|
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 int dlfcn_bind(DSO *dso, const char *symname, void **symptr)
|
|
{
|
|
void *ptr, *sym;
|
|
|
|
if((dso == NULL) || (symptr == NULL) || (symname == NULL))
|
|
{
|
|
DSOerr(DSO_F_DLFCN_BIND,ERR_R_PASSED_NULL_PARAMETER);
|
|
return(0);
|
|
}
|
|
if(sk_num(dso->meth_data) < 1)
|
|
{
|
|
DSOerr(DSO_F_DLFCN_BIND,DSO_R_STACK_ERROR);
|
|
return(0);
|
|
}
|
|
ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
|
|
if(ptr == NULL)
|
|
{
|
|
DSOerr(DSO_F_DLFCN_BIND,DSO_R_NULL_HANDLE);
|
|
return(0);
|
|
}
|
|
sym = dlsym(ptr, symname);
|
|
if(sym == NULL)
|
|
{
|
|
DSOerr(DSO_F_DLFCN_BIND,DSO_R_SYM_FAILURE);
|
|
return(0);
|
|
}
|
|
*symptr = sym;
|
|
return(1);
|
|
}
|
|
|
|
static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg)
|
|
{
|
|
if(dso == NULL)
|
|
{
|
|
DSOerr(DSO_F_DLFCN_CTRL,ERR_R_PASSED_NULL_PARAMETER);
|
|
return(-1);
|
|
}
|
|
switch(cmd)
|
|
{
|
|
case DSO_CTRL_GET_FLAGS:
|
|
return dso->flags;
|
|
case DSO_CTRL_SET_FLAGS:
|
|
dso->flags = (int)larg;
|
|
return(0);
|
|
case DSO_CTRL_OR_FLAGS:
|
|
dso->flags |= (int)larg;
|
|
return(0);
|
|
default:
|
|
break;
|
|
}
|
|
DSOerr(DSO_F_DLFCN_CTRL,DSO_R_UNKNOWN_COMMAND);
|
|
return(-1);
|
|
}
|
|
|
|
#endif /* DSO_DLFCN */
|