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>
73 DSO_METHOD *DSO_METHOD_dlfcn(void)
81 # define __EXTENSIONS__
84 # define HAVE_DLINFO 1
85 # if defined(_AIX) || defined(__CYGWIN__) || \
86 defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
87 (defined(__osf__) && !defined(RTLD_NEXT)) || \
88 (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
94 /* Part of the hack in "dlfcn_load" ... */
95 # define DSO_MAX_TRANSLATED_SIZE 256
97 static int dlfcn_load(DSO *dso);
98 static int dlfcn_unload(DSO *dso);
99 static void *dlfcn_bind_var(DSO *dso, const char *symname);
100 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
101 static char *dlfcn_name_converter(DSO *dso, const char *filename);
102 static char *dlfcn_merger(DSO *dso, const char *filespec1,
103 const char *filespec2);
104 static int dlfcn_pathbyaddr(void *addr, char *path, int sz);
105 static void *dlfcn_globallookup(const char *name);
107 static DSO_METHOD dso_meth_dlfcn = {
108 "OpenSSL 'dlfcn' shared library method",
114 dlfcn_name_converter,
122 DSO_METHOD *DSO_METHOD_dlfcn(void)
124 return (&dso_meth_dlfcn);
128 * Prior to using the dlopen() function, we should decide on the flag we
129 * send. There's a few different ways of doing this and it's a messy
130 * venn-diagram to match up which platforms support what. So as we don't have
131 * autoconf yet, I'm implementing a hack that could be hacked further
132 * relatively easily to deal with cases as we find them. Initially this is to
135 # if defined(__OpenBSD__) || defined(__NetBSD__)
137 # define DLOPEN_FLAG DL_LAZY
140 # define DLOPEN_FLAG RTLD_NOW
142 # define DLOPEN_FLAG 0
146 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
150 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
151 * (void*) returned from dlopen().
154 static int dlfcn_load(DSO *dso)
157 /* See applicable comments in dso_dl.c */
158 char *filename = DSO_convert_filename(dso, NULL);
159 int flags = DLOPEN_FLAG;
161 if (filename == NULL) {
162 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME);
166 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
167 flags |= RTLD_GLOBAL;
169 ptr = dlopen(filename, flags);
171 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED);
172 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
175 if (!sk_void_push(dso->meth_data, (char *)ptr)) {
176 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR);
180 dso->loaded_filename = filename;
184 OPENSSL_free(filename);
190 static int dlfcn_unload(DSO *dso)
194 DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
197 if (sk_void_num(dso->meth_data) < 1)
199 ptr = sk_void_pop(dso->meth_data);
201 DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
203 * Should push the value back onto the stack in case of a retry.
205 sk_void_push(dso->meth_data, ptr);
208 /* For now I'm not aware of any errors associated with dlclose() */
213 static void *dlfcn_bind_var(DSO *dso, const char *symname)
217 if ((dso == NULL) || (symname == NULL)) {
218 DSOerr(DSO_F_DLFCN_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER);
221 if (sk_void_num(dso->meth_data) < 1) {
222 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_STACK_ERROR);
225 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
227 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_NULL_HANDLE);
230 sym = dlsym(ptr, symname);
232 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_SYM_FAILURE);
233 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
239 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
247 if ((dso == NULL) || (symname == NULL)) {
248 DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
251 if (sk_void_num(dso->meth_data) < 1) {
252 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
255 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
257 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
260 u.dlret = dlsym(ptr, symname);
261 if (u.dlret == NULL) {
262 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
263 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
269 static char *dlfcn_merger(DSO *dso, const char *filespec1,
270 const char *filespec2)
274 if (!filespec1 && !filespec2) {
275 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
279 * If the first file specification is a rooted path, it rules. same goes
280 * if the second file specification is missing.
282 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
283 merged = OPENSSL_malloc(strlen(filespec1) + 1);
284 if (merged == NULL) {
285 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
288 strcpy(merged, filespec1);
291 * If the first file specification is missing, the second one rules.
293 else if (!filespec1) {
294 merged = OPENSSL_malloc(strlen(filespec2) + 1);
295 if (merged == NULL) {
296 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
299 strcpy(merged, filespec2);
302 * This part isn't as trivial as it looks. It assumes that the
303 * second file specification really is a directory, and makes no
304 * checks whatsoever. Therefore, the result becomes the
305 * concatenation of filespec2 followed by a slash followed by
310 spec2len = strlen(filespec2);
311 len = spec2len + strlen(filespec1);
313 if (spec2len && filespec2[spec2len - 1] == '/') {
317 merged = OPENSSL_malloc(len + 2);
318 if (merged == NULL) {
319 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
322 strcpy(merged, filespec2);
323 merged[spec2len] = '/';
324 strcpy(&merged[spec2len + 1], filespec1);
329 # ifdef OPENSSL_SYS_MACOSX
330 # define DSO_ext ".dylib"
331 # define DSO_extlen 6
333 # define DSO_ext ".so"
334 # define DSO_extlen 3
337 static char *dlfcn_name_converter(DSO *dso, const char *filename)
340 int len, rsize, transform;
342 len = strlen(filename);
344 transform = (strstr(filename, "/") == NULL);
346 /* We will convert this to "%s.so" or "lib%s.so" etc */
347 rsize += DSO_extlen; /* The length of ".so" */
348 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
349 rsize += 3; /* The length of "lib" */
351 translated = OPENSSL_malloc(rsize);
352 if (translated == NULL) {
353 DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
357 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
358 sprintf(translated, "lib%s" DSO_ext, filename);
360 sprintf(translated, "%s" DSO_ext, filename);
362 sprintf(translated, "%s", filename);
368 This is a quote from IRIX manual for dladdr(3c):
370 <dlfcn.h> does not contain a prototype for dladdr or definition of
371 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
372 but contains no dladdr prototype and no IRIX library contains an
373 implementation. Write your own declaration based on the code below.
375 The following code is dependent on internal interfaces that are not
376 part of the IRIX compatibility guarantee; however, there is no future
377 intention to change this interface, so on a practical level, the code
378 below is safe to use on IRIX.
380 # include <rld_interface.h>
381 # ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
382 # define _RLD_INTERFACE_DLFCN_H_DLADDR
383 typedef struct Dl_info {
384 const char *dli_fname;
386 const char *dli_sname;
390 long dli_reserved[4];
393 typedef struct Dl_info Dl_info;
395 # define _RLD_DLADDR 14
397 static int dladdr(void *address, Dl_info *dl)
400 v = _rld_new_interface(_RLD_DLADDR, address, dl);
405 static int dlfcn_pathbyaddr(void *addr, char *path, int sz)
413 int (*f) (void *, char *, int);
421 if (dladdr(addr, &dli)) {
422 len = (int)strlen(dli.dli_fname);
427 memcpy(path, dli.dli_fname, len);
432 ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror());
437 static void *dlfcn_globallookup(const char *name)
439 void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
442 ret = dlsym(handle, name);
448 #endif /* DSO_DLFCN */