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465 lines
14 KiB
465 lines
14 KiB
/* dso_dlfcn.c */ |
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/* |
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* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project |
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* 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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/* |
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* We need to do this early, because stdio.h includes the header files that |
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* handle _GNU_SOURCE and other similar macros. Defining it later is simply |
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* too late, because those headers are protected from re- inclusion. |
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*/ |
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#ifndef _GNU_SOURCE |
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# define _GNU_SOURCE /* make sure dladdr is declared */ |
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#endif |
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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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|
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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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# ifdef __osf__ |
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# define __EXTENSIONS__ |
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# endif |
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# include <dlfcn.h> |
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# define HAVE_DLINFO 1 |
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# if defined(_AIX) || defined(__CYGWIN__) || \ |
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defined(__SCO_VERSION__) || defined(_SCO_ELF) || \ |
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(defined(__osf__) && !defined(RTLD_NEXT)) || \ |
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(defined(__OpenBSD__) && !defined(RTLD_SELF)) || \ |
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defined(__ANDROID__) |
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# undef HAVE_DLINFO |
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# endif |
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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 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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"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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dlfcn_merger, |
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NULL, /* init */ |
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NULL, /* finish */ |
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dlfcn_pathbyaddr, |
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dlfcn_globallookup |
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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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/* |
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* Prior to using the dlopen() function, we should decide on the flag we |
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* send. There's a few different ways of doing this and it's a messy |
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* venn-diagram to match up which platforms support what. So as we don't have |
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* autoconf yet, I'm implementing a hack that could be hacked further |
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* relatively easily to deal with cases as we find them. Initially this is to |
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* cope with OpenBSD. |
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*/ |
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# if defined(__OpenBSD__) || defined(__NetBSD__) |
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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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# ifdef OPENSSL_SYS_SUNOS |
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# define DLOPEN_FLAG 1 |
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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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# endif |
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/* |
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* For this DSO_METHOD, our meth_data STACK will contain; (i) the handle |
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* (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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int flags = DLOPEN_FLAG; |
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if (filename == NULL) { |
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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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# ifdef RTLD_GLOBAL |
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if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS) |
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flags |= RTLD_GLOBAL; |
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# endif |
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ptr = dlopen(filename, flags); |
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if (ptr == NULL) { |
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DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED); |
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ERR_add_error_data(4, "filename(", filename, "): ", 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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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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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_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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DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE); |
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/* |
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* Should push the value back onto the stack in case of a retry. |
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*/ |
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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 *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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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_void_num(dso->meth_data) < 1) { |
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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 = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1); |
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if (ptr == NULL) { |
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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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DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_SYM_FAILURE); |
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ERR_add_error_data(4, "symname(", 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 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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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_void_num(dso->meth_data) < 1) { |
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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 = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1); |
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if (ptr == NULL) { |
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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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u.dlret = dlsym(ptr, symname); |
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if (u.dlret == NULL) { |
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DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE); |
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ERR_add_error_data(4, "symname(", 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 *dlfcn_merger(DSO *dso, const char *filespec1, |
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const char *filespec2) |
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{ |
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char *merged; |
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if (!filespec1 && !filespec2) { |
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DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER); |
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return (NULL); |
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} |
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/* |
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* If the first file specification is a rooted path, it rules. same goes |
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* if the second file specification is missing. |
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*/ |
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if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) { |
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merged = OPENSSL_malloc(strlen(filespec1) + 1); |
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if (!merged) { |
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DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE); |
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return (NULL); |
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} |
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strcpy(merged, filespec1); |
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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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*/ |
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else if (!filespec1) { |
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merged = OPENSSL_malloc(strlen(filespec2) + 1); |
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if (!merged) { |
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DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE); |
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return (NULL); |
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} |
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strcpy(merged, filespec2); |
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} else { |
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/* |
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* This part isn't as trivial as it looks. It assumes that the |
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* second file specification really is a directory, and makes no |
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* checks whatsoever. Therefore, the result becomes the |
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* concatenation of filespec2 followed by a slash followed by |
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* filespec1. |
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*/ |
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int spec2len, len; |
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spec2len = strlen(filespec2); |
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len = spec2len + strlen(filespec1); |
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if (spec2len && filespec2[spec2len - 1] == '/') { |
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spec2len--; |
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len--; |
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} |
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merged = OPENSSL_malloc(len + 2); |
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if (!merged) { |
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DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE); |
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return (NULL); |
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} |
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strcpy(merged, filespec2); |
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merged[spec2len] = '/'; |
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strcpy(&merged[spec2len + 1], filespec1); |
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} |
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return (merged); |
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} |
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# ifdef OPENSSL_SYS_MACOSX |
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# define DSO_ext ".dylib" |
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# define DSO_extlen 6 |
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# else |
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# define DSO_ext ".so" |
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# define DSO_extlen 3 |
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# endif |
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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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/* We will convert this to "%s.so" or "lib%s.so" etc */ |
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rsize += DSO_extlen; /* 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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DSOerr(DSO_F_DLFCN_NAME_CONVERTER, 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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if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) |
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sprintf(translated, "lib%s" DSO_ext, filename); |
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else |
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sprintf(translated, "%s" DSO_ext, filename); |
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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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# ifdef __sgi |
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/*- |
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This is a quote from IRIX manual for dladdr(3c): |
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<dlfcn.h> does not contain a prototype for dladdr or definition of |
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Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional, |
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but contains no dladdr prototype and no IRIX library contains an |
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implementation. Write your own declaration based on the code below. |
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The following code is dependent on internal interfaces that are not |
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part of the IRIX compatibility guarantee; however, there is no future |
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intention to change this interface, so on a practical level, the code |
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below is safe to use on IRIX. |
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*/ |
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# include <rld_interface.h> |
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# ifndef _RLD_INTERFACE_DLFCN_H_DLADDR |
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# define _RLD_INTERFACE_DLFCN_H_DLADDR |
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typedef struct Dl_info { |
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const char *dli_fname; |
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void *dli_fbase; |
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const char *dli_sname; |
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void *dli_saddr; |
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int dli_version; |
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int dli_reserved1; |
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long dli_reserved[4]; |
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} Dl_info; |
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# else |
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typedef struct Dl_info Dl_info; |
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# endif |
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# define _RLD_DLADDR 14 |
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static int dladdr(void *address, Dl_info *dl) |
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{ |
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void *v; |
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v = _rld_new_interface(_RLD_DLADDR, address, dl); |
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return (int)v; |
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} |
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# endif /* __sgi */ |
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static int dlfcn_pathbyaddr(void *addr, char *path, int sz) |
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{ |
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# ifdef HAVE_DLINFO |
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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 = { |
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dlfcn_pathbyaddr |
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}; |
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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_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror()); |
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# endif |
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return -1; |
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} |
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static void *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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