2 * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
60 * We need to do this early, because stdio.h includes the header files that
61 * handle _GNU_SOURCE and other similar macros. Defining it later is simply
62 * too late, because those headers are protected from re- inclusion.
65 # define _GNU_SOURCE /* make sure dladdr is declared */
69 #include "internal/cryptlib.h"
70 #include <openssl/dso.h>
71 #include "internal/dso_conf.h"
74 DSO_METHOD *DSO_METHOD_dlfcn(void)
82 # define __EXTENSIONS__
85 # define HAVE_DLINFO 1
86 # if defined(_AIX) || defined(__CYGWIN__) || \
87 defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
88 (defined(__osf__) && !defined(RTLD_NEXT)) || \
89 (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
95 /* Part of the hack in "dlfcn_load" ... */
96 # define DSO_MAX_TRANSLATED_SIZE 256
98 static int dlfcn_load(DSO *dso);
99 static int dlfcn_unload(DSO *dso);
100 static void *dlfcn_bind_var(DSO *dso, const char *symname);
101 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
102 static char *dlfcn_name_converter(DSO *dso, const char *filename);
103 static char *dlfcn_merger(DSO *dso, const char *filespec1,
104 const char *filespec2);
105 static int dlfcn_pathbyaddr(void *addr, char *path, int sz);
106 static void *dlfcn_globallookup(const char *name);
108 static DSO_METHOD dso_meth_dlfcn = {
109 "OpenSSL 'dlfcn' shared library method",
115 dlfcn_name_converter,
123 DSO_METHOD *DSO_METHOD_dlfcn(void)
125 return (&dso_meth_dlfcn);
129 * Prior to using the dlopen() function, we should decide on the flag we
130 * send. There's a few different ways of doing this and it's a messy
131 * venn-diagram to match up which platforms support what. So as we don't have
132 * autoconf yet, I'm implementing a hack that could be hacked further
133 * relatively easily to deal with cases as we find them. Initially this is to
136 # if defined(__OpenBSD__) || defined(__NetBSD__)
138 # define DLOPEN_FLAG DL_LAZY
141 # define DLOPEN_FLAG RTLD_NOW
143 # define DLOPEN_FLAG 0
147 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
151 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
152 * (void*) returned from dlopen().
155 static int dlfcn_load(DSO *dso)
158 /* See applicable comments in dso_dl.c */
159 char *filename = DSO_convert_filename(dso, NULL);
160 int flags = DLOPEN_FLAG;
162 if (filename == NULL) {
163 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME);
167 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
168 flags |= RTLD_GLOBAL;
170 ptr = dlopen(filename, flags);
172 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED);
173 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
176 if (!sk_void_push(dso->meth_data, (char *)ptr)) {
177 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR);
181 dso->loaded_filename = filename;
185 OPENSSL_free(filename);
191 static int dlfcn_unload(DSO *dso)
195 DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
198 if (sk_void_num(dso->meth_data) < 1)
200 ptr = sk_void_pop(dso->meth_data);
202 DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
204 * Should push the value back onto the stack in case of a retry.
206 sk_void_push(dso->meth_data, ptr);
209 /* For now I'm not aware of any errors associated with dlclose() */
214 static void *dlfcn_bind_var(DSO *dso, const char *symname)
218 if ((dso == NULL) || (symname == NULL)) {
219 DSOerr(DSO_F_DLFCN_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER);
222 if (sk_void_num(dso->meth_data) < 1) {
223 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_STACK_ERROR);
226 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
228 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_NULL_HANDLE);
231 sym = dlsym(ptr, symname);
233 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_SYM_FAILURE);
234 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
240 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
248 if ((dso == NULL) || (symname == NULL)) {
249 DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
252 if (sk_void_num(dso->meth_data) < 1) {
253 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
256 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
258 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
261 u.dlret = dlsym(ptr, symname);
262 if (u.dlret == NULL) {
263 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
264 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
270 static char *dlfcn_merger(DSO *dso, const char *filespec1,
271 const char *filespec2)
275 if (!filespec1 && !filespec2) {
276 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
280 * If the first file specification is a rooted path, it rules. same goes
281 * if the second file specification is missing.
283 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
284 merged = OPENSSL_strdup(filespec1);
285 if (merged == NULL) {
286 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
291 * If the first file specification is missing, the second one rules.
293 else if (!filespec1) {
294 merged = OPENSSL_strdup(filespec2);
295 if (merged == NULL) {
296 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
301 * This part isn't as trivial as it looks. It assumes that the
302 * second file specification really is a directory, and makes no
303 * checks whatsoever. Therefore, the result becomes the
304 * concatenation of filespec2 followed by a slash followed by
309 spec2len = strlen(filespec2);
310 len = spec2len + strlen(filespec1);
312 if (spec2len && filespec2[spec2len - 1] == '/') {
316 merged = OPENSSL_malloc(len + 2);
317 if (merged == NULL) {
318 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
321 strcpy(merged, filespec2);
322 merged[spec2len] = '/';
323 strcpy(&merged[spec2len + 1], filespec1);
328 static char *dlfcn_name_converter(DSO *dso, const char *filename)
331 int len, rsize, transform;
333 len = strlen(filename);
335 transform = (strstr(filename, "/") == NULL);
337 /* We will convert this to "%s.so" or "lib%s.so" etc */
338 rsize += strlen(DSO_EXTENSION); /* The length of ".so" */
339 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
340 rsize += 3; /* The length of "lib" */
342 translated = OPENSSL_malloc(rsize);
343 if (translated == NULL) {
344 DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
348 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
349 sprintf(translated, "lib%s" DSO_EXTENSION, filename);
351 sprintf(translated, "%s" DSO_EXTENSION, filename);
353 sprintf(translated, "%s", filename);
359 This is a quote from IRIX manual for dladdr(3c):
361 <dlfcn.h> does not contain a prototype for dladdr or definition of
362 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
363 but contains no dladdr prototype and no IRIX library contains an
364 implementation. Write your own declaration based on the code below.
366 The following code is dependent on internal interfaces that are not
367 part of the IRIX compatibility guarantee; however, there is no future
368 intention to change this interface, so on a practical level, the code
369 below is safe to use on IRIX.
371 # include <rld_interface.h>
372 # ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
373 # define _RLD_INTERFACE_DLFCN_H_DLADDR
374 typedef struct Dl_info {
375 const char *dli_fname;
377 const char *dli_sname;
381 long dli_reserved[4];
384 typedef struct Dl_info Dl_info;
386 # define _RLD_DLADDR 14
388 static int dladdr(void *address, Dl_info *dl)
391 v = _rld_new_interface(_RLD_DLADDR, address, dl);
396 static int dlfcn_pathbyaddr(void *addr, char *path, int sz)
404 int (*f) (void *, char *, int);
412 if (dladdr(addr, &dli)) {
413 len = (int)strlen(dli.dli_fname);
418 memcpy(path, dli.dli_fname, len);
423 ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror());
428 static void *dlfcn_globallookup(const char *name)
430 void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
433 ret = dlsym(handle, name);
439 #endif /* DSO_DLFCN */