1 /* dso_dlfcn.c -*- mode:C; c-file-style: "eay" -*- */
3 * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
61 * We need to do this early, because stdio.h includes the header files that
62 * handle _GNU_SOURCE and other similar macros. Defining it later is simply
63 * too late, because those headers are protected from re- inclusion.
66 # define _GNU_SOURCE /* make sure dladdr is declared */
71 #include <openssl/dso.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 if (filename != NULL)
186 OPENSSL_free(filename);
192 static int dlfcn_unload(DSO *dso)
196 DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
199 if (sk_void_num(dso->meth_data) < 1)
201 ptr = sk_void_pop(dso->meth_data);
203 DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
205 * Should push the value back onto the stack in case of a retry.
207 sk_void_push(dso->meth_data, ptr);
210 /* For now I'm not aware of any errors associated with dlclose() */
215 static void *dlfcn_bind_var(DSO *dso, const char *symname)
219 if ((dso == NULL) || (symname == NULL)) {
220 DSOerr(DSO_F_DLFCN_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER);
223 if (sk_void_num(dso->meth_data) < 1) {
224 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_STACK_ERROR);
227 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
229 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_NULL_HANDLE);
232 sym = dlsym(ptr, symname);
234 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_SYM_FAILURE);
235 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
241 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
249 if ((dso == NULL) || (symname == NULL)) {
250 DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
253 if (sk_void_num(dso->meth_data) < 1) {
254 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
257 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
259 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
262 u.dlret = dlsym(ptr, symname);
263 if (u.dlret == NULL) {
264 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
265 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
271 static char *dlfcn_merger(DSO *dso, const char *filespec1,
272 const char *filespec2)
276 if (!filespec1 && !filespec2) {
277 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
281 * If the first file specification is a rooted path, it rules. same goes
282 * if the second file specification is missing.
284 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
285 merged = OPENSSL_malloc(strlen(filespec1) + 1);
287 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
290 strcpy(merged, filespec1);
293 * If the first file specification is missing, the second one rules.
295 else if (!filespec1) {
296 merged = OPENSSL_malloc(strlen(filespec2) + 1);
298 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
301 strcpy(merged, filespec2);
304 * This part isn't as trivial as it looks. It assumes that the
305 * second file specification really is a directory, and makes no
306 * checks whatsoever. Therefore, the result becomes the
307 * concatenation of filespec2 followed by a slash followed by
312 spec2len = strlen(filespec2);
313 len = spec2len + strlen(filespec1);
315 if (spec2len && filespec2[spec2len - 1] == '/') {
319 merged = OPENSSL_malloc(len + 2);
321 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
324 strcpy(merged, filespec2);
325 merged[spec2len] = '/';
326 strcpy(&merged[spec2len + 1], filespec1);
331 # ifdef OPENSSL_SYS_MACOSX
332 # define DSO_ext ".dylib"
333 # define DSO_extlen 6
335 # define DSO_ext ".so"
336 # define DSO_extlen 3
339 static char *dlfcn_name_converter(DSO *dso, const char *filename)
342 int len, rsize, transform;
344 len = strlen(filename);
346 transform = (strstr(filename, "/") == NULL);
348 /* We will convert this to "%s.so" or "lib%s.so" etc */
349 rsize += DSO_extlen; /* The length of ".so" */
350 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
351 rsize += 3; /* The length of "lib" */
353 translated = OPENSSL_malloc(rsize);
354 if (translated == NULL) {
355 DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
359 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
360 sprintf(translated, "lib%s" DSO_ext, filename);
362 sprintf(translated, "%s" DSO_ext, filename);
364 sprintf(translated, "%s", filename);
370 This is a quote from IRIX manual for dladdr(3c):
372 <dlfcn.h> does not contain a prototype for dladdr or definition of
373 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
374 but contains no dladdr prototype and no IRIX library contains an
375 implementation. Write your own declaration based on the code below.
377 The following code is dependent on internal interfaces that are not
378 part of the IRIX compatibility guarantee; however, there is no future
379 intention to change this interface, so on a practical level, the code
380 below is safe to use on IRIX.
382 # include <rld_interface.h>
383 # ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
384 # define _RLD_INTERFACE_DLFCN_H_DLADDR
385 typedef struct Dl_info {
386 const char *dli_fname;
388 const char *dli_sname;
392 long dli_reserved[4];
395 typedef struct Dl_info Dl_info;
397 # define _RLD_DLADDR 14
399 static int dladdr(void *address, Dl_info *dl)
402 v = _rld_new_interface(_RLD_DLADDR, address, dl);
407 static int dlfcn_pathbyaddr(void *addr, char *path, int sz)
415 int (*f) (void *, char *, int);
423 if (dladdr(addr, &dli)) {
424 len = (int)strlen(dli.dli_fname);
429 memcpy(path, dli.dli_fname, len);
434 ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror());
439 static void *dlfcn_globallookup(const char *name)
441 void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
444 ret = dlsym(handle, name);
450 #endif /* DSO_DLFCN */