289 lines
7.9 KiB
C
289 lines
7.9 KiB
C
/* dso_dlfcn.c */
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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 "cryptlib.h"
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#include <openssl/dso.h>
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#ifndef DSO_DLFCN
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DSO_METHOD *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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#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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#if 0
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static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
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static int dlfcn_init(DSO *dso);
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static int dlfcn_finish(DSO *dso);
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static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
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#endif
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static char *dlfcn_name_converter(DSO *dso, const char *filename);
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static DSO_METHOD dso_meth_dlfcn = {
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"OpenSSL 'dlfcn' shared library method",
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dlfcn_load,
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dlfcn_unload,
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dlfcn_bind_var,
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dlfcn_bind_func,
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/* For now, "unbind" doesn't exist */
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#if 0
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NULL, /* unbind_var */
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NULL, /* unbind_func */
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#endif
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NULL, /* ctrl */
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dlfcn_name_converter,
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NULL, /* init */
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NULL /* finish */
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};
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DSO_METHOD *DSO_METHOD_dlfcn(void)
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{
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return(&dso_meth_dlfcn);
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}
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/* Prior to using the dlopen() function, we should decide on the flag
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* we send. There's a few different ways of doing this and it's a
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* messy venn-diagram to match up which platforms support what. So
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* as we don't have autoconf yet, I'm implementing a hack that could
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* be hacked further relatively easily to deal with cases as we find
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* them. Initially this is to cope with OpenBSD. */
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#ifdef __OpenBSD__
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# ifdef DL_LAZY
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# define DLOPEN_FLAG DL_LAZY
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# else
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# ifdef RTLD_NOW
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# define DLOPEN_FLAG RTLD_NOW
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# else
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# define DLOPEN_FLAG 0
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# endif
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# endif
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#else
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# define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
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#endif
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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 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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if(filename == NULL)
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{
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DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
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goto err;
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}
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ptr = dlopen(filename, DLOPEN_FLAG);
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if(ptr == NULL)
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{
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DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
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ERR_add_error_data(3, "filename(", filename, ")");
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goto err;
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}
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if(!sk_push(dso->meth_data, (char *)ptr))
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{
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DSOerr(DSO_F_DLFCN_LOAD,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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if(filename != NULL)
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OPENSSL_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 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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{
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DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
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return(0);
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}
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if(sk_num(dso->meth_data) < 1)
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return(1);
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ptr = (void *)sk_pop(dso->meth_data);
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if(ptr == NULL)
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{
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DSOerr(DSO_F_DLFCN_UNLOAD,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_push(dso->meth_data, (char *)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 *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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{
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DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
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return(NULL);
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}
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if(sk_num(dso->meth_data) < 1)
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{
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DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
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return(NULL);
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}
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ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
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if(ptr == NULL)
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{
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DSOerr(DSO_F_DLFCN_BIND_VAR,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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{
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DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
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ERR_add_error_data(3, "symname(", symname, ")");
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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 dlfcn_bind_func(DSO *dso, const char *symname)
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{
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void *ptr;
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DSO_FUNC_TYPE sym;
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if((dso == NULL) || (symname == NULL))
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{
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DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
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return(NULL);
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}
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if(sk_num(dso->meth_data) < 1)
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{
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DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
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return(NULL);
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}
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ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
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if(ptr == NULL)
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{
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DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
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return(NULL);
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}
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sym = (DSO_FUNC_TYPE)dlsym(ptr, symname);
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if(sym == NULL)
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{
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DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
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ERR_add_error_data(3, "symname(", symname, ")");
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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 char *dlfcn_name_converter(DSO *dso, const char *filename)
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{
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char *translated;
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int len, rsize, transform;
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len = strlen(filename);
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rsize = len + 1;
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transform = (strstr(filename, "/") == NULL);
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if(transform)
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{
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/* We will convert this to "%s.so" or "lib%s.so" */
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rsize += 3; /* The length of ".so" */
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if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
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rsize += 3; /* The length of "lib" */
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}
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translated = OPENSSL_malloc(rsize);
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if(translated == NULL)
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{
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DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
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DSO_R_NAME_TRANSLATION_FAILED);
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return(NULL);
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}
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if(transform)
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{
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if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
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sprintf(translated, "lib%s.so", filename);
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else
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sprintf(translated, "%s.so", filename);
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}
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else
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sprintf(translated, "%s", filename);
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return(translated);
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}
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#endif /* DSO_DLFCN */
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