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 */
74 # define __EXTENSIONS__
77 # define HAVE_DLINFO 1
78 # if defined(_AIX) || defined(__CYGWIN__) || \
79 defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
80 (defined(__osf__) && !defined(RTLD_NEXT)) || \
81 (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
87 /* Part of the hack in "dlfcn_load" ... */
88 # define DSO_MAX_TRANSLATED_SIZE 256
90 static int dlfcn_load(DSO *dso);
91 static int dlfcn_unload(DSO *dso);
92 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
93 static char *dlfcn_name_converter(DSO *dso, const char *filename);
94 static char *dlfcn_merger(DSO *dso, const char *filespec1,
95 const char *filespec2);
96 static void *dlfcn_globallookup(const char *name);
98 static DSO_METHOD dso_meth_dlfcn = {
99 "OpenSSL 'dlfcn' shared library method",
104 dlfcn_name_converter,
111 DSO_METHOD *DSO_METHOD_openssl(void)
113 return &dso_meth_dlfcn;
117 * Prior to using the dlopen() function, we should decide on the flag we
118 * send. There's a few different ways of doing this and it's a messy
119 * venn-diagram to match up which platforms support what. So as we don't have
120 * autoconf yet, I'm implementing a hack that could be hacked further
121 * relatively easily to deal with cases as we find them. Initially this is to
124 # if defined(__OpenBSD__) || defined(__NetBSD__)
126 # define DLOPEN_FLAG DL_LAZY
129 # define DLOPEN_FLAG RTLD_NOW
131 # define DLOPEN_FLAG 0
135 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
139 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
140 * (void*) returned from dlopen().
143 static int dlfcn_load(DSO *dso)
146 /* See applicable comments in dso_dl.c */
147 char *filename = DSO_convert_filename(dso, NULL);
148 int flags = DLOPEN_FLAG;
150 if (filename == NULL) {
151 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME);
155 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
156 flags |= RTLD_GLOBAL;
158 ptr = dlopen(filename, flags);
160 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED);
161 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
164 if (!sk_void_push(dso->meth_data, (char *)ptr)) {
165 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR);
169 dso->loaded_filename = filename;
173 OPENSSL_free(filename);
179 static int dlfcn_unload(DSO *dso)
183 DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
186 if (sk_void_num(dso->meth_data) < 1)
188 ptr = sk_void_pop(dso->meth_data);
190 DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
192 * Should push the value back onto the stack in case of a retry.
194 sk_void_push(dso->meth_data, ptr);
197 /* For now I'm not aware of any errors associated with dlclose() */
202 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
210 if ((dso == NULL) || (symname == NULL)) {
211 DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
214 if (sk_void_num(dso->meth_data) < 1) {
215 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
218 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
220 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
223 u.dlret = dlsym(ptr, symname);
224 if (u.dlret == NULL) {
225 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
226 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
232 static char *dlfcn_merger(DSO *dso, const char *filespec1,
233 const char *filespec2)
237 if (!filespec1 && !filespec2) {
238 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
242 * If the first file specification is a rooted path, it rules. same goes
243 * if the second file specification is missing.
245 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
246 merged = OPENSSL_strdup(filespec1);
247 if (merged == NULL) {
248 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
253 * If the first file specification is missing, the second one rules.
255 else if (!filespec1) {
256 merged = OPENSSL_strdup(filespec2);
257 if (merged == NULL) {
258 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
263 * This part isn't as trivial as it looks. It assumes that the
264 * second file specification really is a directory, and makes no
265 * checks whatsoever. Therefore, the result becomes the
266 * concatenation of filespec2 followed by a slash followed by
271 spec2len = strlen(filespec2);
272 len = spec2len + strlen(filespec1);
274 if (spec2len && filespec2[spec2len - 1] == '/') {
278 merged = OPENSSL_malloc(len + 2);
279 if (merged == NULL) {
280 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
283 strcpy(merged, filespec2);
284 merged[spec2len] = '/';
285 strcpy(&merged[spec2len + 1], filespec1);
290 static char *dlfcn_name_converter(DSO *dso, const char *filename)
293 int len, rsize, transform;
295 len = strlen(filename);
297 transform = (strstr(filename, "/") == NULL);
299 /* We will convert this to "%s.so" or "lib%s.so" etc */
300 rsize += strlen(DSO_EXTENSION); /* The length of ".so" */
301 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
302 rsize += 3; /* The length of "lib" */
304 translated = OPENSSL_malloc(rsize);
305 if (translated == NULL) {
306 DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
310 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
311 sprintf(translated, "lib%s" DSO_EXTENSION, filename);
313 sprintf(translated, "%s" DSO_EXTENSION, filename);
315 sprintf(translated, "%s", filename);
321 This is a quote from IRIX manual for dladdr(3c):
323 <dlfcn.h> does not contain a prototype for dladdr or definition of
324 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
325 but contains no dladdr prototype and no IRIX library contains an
326 implementation. Write your own declaration based on the code below.
328 The following code is dependent on internal interfaces that are not
329 part of the IRIX compatibility guarantee; however, there is no future
330 intention to change this interface, so on a practical level, the code
331 below is safe to use on IRIX.
333 # include <rld_interface.h>
334 # ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
335 # define _RLD_INTERFACE_DLFCN_H_DLADDR
336 typedef struct Dl_info {
337 const char *dli_fname;
339 const char *dli_sname;
343 long dli_reserved[4];
346 typedef struct Dl_info Dl_info;
348 # define _RLD_DLADDR 14
350 static int dladdr(void *address, Dl_info *dl)
353 v = _rld_new_interface(_RLD_DLADDR, address, dl);
358 static void *dlfcn_globallookup(const char *name)
360 void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
363 ret = dlsym(handle, name);
369 #endif /* DSO_DLFCN */