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);
103 static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
104 static int dlfcn_init(DSO *dso);
105 static int dlfcn_finish(DSO *dso);
106 static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
108 static char *dlfcn_name_converter(DSO *dso, const char *filename);
109 static char *dlfcn_merger(DSO *dso, const char *filespec1,
110 const char *filespec2);
111 static int dlfcn_pathbyaddr(void *addr, char *path, int sz);
112 static void *dlfcn_globallookup(const char *name);
114 static DSO_METHOD dso_meth_dlfcn = {
115 "OpenSSL 'dlfcn' shared library method",
120 /* For now, "unbind" doesn't exist */
122 NULL, /* unbind_var */
123 NULL, /* unbind_func */
126 dlfcn_name_converter,
134 DSO_METHOD *DSO_METHOD_dlfcn(void)
136 return (&dso_meth_dlfcn);
140 * Prior to using the dlopen() function, we should decide on the flag we
141 * send. There's a few different ways of doing this and it's a messy
142 * venn-diagram to match up which platforms support what. So as we don't have
143 * autoconf yet, I'm implementing a hack that could be hacked further
144 * relatively easily to deal with cases as we find them. Initially this is to
147 # if defined(__OpenBSD__) || defined(__NetBSD__)
149 # define DLOPEN_FLAG DL_LAZY
152 # define DLOPEN_FLAG RTLD_NOW
154 # define DLOPEN_FLAG 0
158 # ifdef OPENSSL_SYS_SUNOS
159 # define DLOPEN_FLAG 1
161 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
166 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
167 * (void*) returned from dlopen().
170 static int dlfcn_load(DSO *dso)
173 /* See applicable comments in dso_dl.c */
174 char *filename = DSO_convert_filename(dso, NULL);
175 int flags = DLOPEN_FLAG;
177 if (filename == NULL) {
178 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME);
182 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
183 flags |= RTLD_GLOBAL;
185 ptr = dlopen(filename, flags);
187 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED);
188 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
191 if (!sk_void_push(dso->meth_data, (char *)ptr)) {
192 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR);
196 dso->loaded_filename = filename;
200 if (filename != NULL)
201 OPENSSL_free(filename);
207 static int dlfcn_unload(DSO *dso)
211 DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
214 if (sk_void_num(dso->meth_data) < 1)
216 ptr = sk_void_pop(dso->meth_data);
218 DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
220 * Should push the value back onto the stack in case of a retry.
222 sk_void_push(dso->meth_data, ptr);
225 /* For now I'm not aware of any errors associated with dlclose() */
230 static void *dlfcn_bind_var(DSO *dso, const char *symname)
234 if ((dso == NULL) || (symname == NULL)) {
235 DSOerr(DSO_F_DLFCN_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER);
238 if (sk_void_num(dso->meth_data) < 1) {
239 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_STACK_ERROR);
242 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
244 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_NULL_HANDLE);
247 sym = dlsym(ptr, symname);
249 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_SYM_FAILURE);
250 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
256 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
264 if ((dso == NULL) || (symname == NULL)) {
265 DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
268 if (sk_void_num(dso->meth_data) < 1) {
269 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
272 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
274 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
277 u.dlret = dlsym(ptr, symname);
278 if (u.dlret == NULL) {
279 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
280 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
286 static char *dlfcn_merger(DSO *dso, const char *filespec1,
287 const char *filespec2)
291 if (!filespec1 && !filespec2) {
292 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
296 * If the first file specification is a rooted path, it rules. same goes
297 * if the second file specification is missing.
299 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
300 merged = OPENSSL_malloc(strlen(filespec1) + 1);
302 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
305 strcpy(merged, filespec1);
308 * If the first file specification is missing, the second one rules.
310 else if (!filespec1) {
311 merged = OPENSSL_malloc(strlen(filespec2) + 1);
313 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
316 strcpy(merged, filespec2);
319 * This part isn't as trivial as it looks. It assumes that the
320 * second file specification really is a directory, and makes no
321 * checks whatsoever. Therefore, the result becomes the
322 * concatenation of filespec2 followed by a slash followed by
327 spec2len = strlen(filespec2);
328 len = spec2len + strlen(filespec1);
330 if (spec2len && filespec2[spec2len - 1] == '/') {
334 merged = OPENSSL_malloc(len + 2);
336 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
339 strcpy(merged, filespec2);
340 merged[spec2len] = '/';
341 strcpy(&merged[spec2len + 1], filespec1);
346 # ifdef OPENSSL_SYS_MACOSX
347 # define DSO_ext ".dylib"
348 # define DSO_extlen 6
350 # define DSO_ext ".so"
351 # define DSO_extlen 3
354 static char *dlfcn_name_converter(DSO *dso, const char *filename)
357 int len, rsize, transform;
359 len = strlen(filename);
361 transform = (strstr(filename, "/") == NULL);
363 /* We will convert this to "%s.so" or "lib%s.so" etc */
364 rsize += DSO_extlen; /* The length of ".so" */
365 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
366 rsize += 3; /* The length of "lib" */
368 translated = OPENSSL_malloc(rsize);
369 if (translated == NULL) {
370 DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
374 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
375 sprintf(translated, "lib%s" DSO_ext, filename);
377 sprintf(translated, "%s" DSO_ext, filename);
379 sprintf(translated, "%s", filename);
385 This is a quote from IRIX manual for dladdr(3c):
387 <dlfcn.h> does not contain a prototype for dladdr or definition of
388 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
389 but contains no dladdr prototype and no IRIX library contains an
390 implementation. Write your own declaration based on the code below.
392 The following code is dependent on internal interfaces that are not
393 part of the IRIX compatibility guarantee; however, there is no future
394 intention to change this interface, so on a practical level, the code
395 below is safe to use on IRIX.
397 # include <rld_interface.h>
398 # ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
399 # define _RLD_INTERFACE_DLFCN_H_DLADDR
400 typedef struct Dl_info {
401 const char *dli_fname;
403 const char *dli_sname;
407 long dli_reserved[4];
410 typedef struct Dl_info Dl_info;
412 # define _RLD_DLADDR 14
414 static int dladdr(void *address, Dl_info *dl)
417 v = _rld_new_interface(_RLD_DLADDR, address, dl);
422 static int dlfcn_pathbyaddr(void *addr, char *path, int sz)
430 int (*f) (void *, char *, int);
438 if (dladdr(addr, &dli)) {
439 len = (int)strlen(dli.dli_fname);
444 memcpy(path, dli.dli_fname, len);
449 ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror());
454 static void *dlfcn_globallookup(const char *name)
456 void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
459 ret = dlsym(handle, name);
465 #endif /* DSO_DLFCN */