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);
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 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
162 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
163 * (void*) returned from dlopen().
166 static int dlfcn_load(DSO *dso)
169 /* See applicable comments in dso_dl.c */
170 char *filename = DSO_convert_filename(dso, NULL);
171 int flags = DLOPEN_FLAG;
173 if (filename == NULL) {
174 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME);
178 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
179 flags |= RTLD_GLOBAL;
181 ptr = dlopen(filename, flags);
183 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED);
184 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
187 if (!sk_void_push(dso->meth_data, (char *)ptr)) {
188 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR);
192 dso->loaded_filename = filename;
196 if (filename != NULL)
197 OPENSSL_free(filename);
203 static int dlfcn_unload(DSO *dso)
207 DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
210 if (sk_void_num(dso->meth_data) < 1)
212 ptr = sk_void_pop(dso->meth_data);
214 DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
216 * Should push the value back onto the stack in case of a retry.
218 sk_void_push(dso->meth_data, ptr);
221 /* For now I'm not aware of any errors associated with dlclose() */
226 static void *dlfcn_bind_var(DSO *dso, const char *symname)
230 if ((dso == NULL) || (symname == NULL)) {
231 DSOerr(DSO_F_DLFCN_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER);
234 if (sk_void_num(dso->meth_data) < 1) {
235 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_STACK_ERROR);
238 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
240 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_NULL_HANDLE);
243 sym = dlsym(ptr, symname);
245 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_SYM_FAILURE);
246 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
252 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
260 if ((dso == NULL) || (symname == NULL)) {
261 DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
264 if (sk_void_num(dso->meth_data) < 1) {
265 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
268 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
270 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
273 u.dlret = dlsym(ptr, symname);
274 if (u.dlret == NULL) {
275 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
276 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
282 static char *dlfcn_merger(DSO *dso, const char *filespec1,
283 const char *filespec2)
287 if (!filespec1 && !filespec2) {
288 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
292 * If the first file specification is a rooted path, it rules. same goes
293 * if the second file specification is missing.
295 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
296 merged = OPENSSL_malloc(strlen(filespec1) + 1);
298 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
301 strcpy(merged, filespec1);
304 * If the first file specification is missing, the second one rules.
306 else if (!filespec1) {
307 merged = OPENSSL_malloc(strlen(filespec2) + 1);
309 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
312 strcpy(merged, filespec2);
315 * This part isn't as trivial as it looks. It assumes that the
316 * second file specification really is a directory, and makes no
317 * checks whatsoever. Therefore, the result becomes the
318 * concatenation of filespec2 followed by a slash followed by
324 spec2len = strlen(filespec2);
325 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
327 if (filespec2 && filespec2[spec2len - 1] == '/') {
331 merged = OPENSSL_malloc(len + 2);
333 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
336 strcpy(merged, filespec2);
337 merged[spec2len] = '/';
338 strcpy(&merged[spec2len + 1], filespec1);
343 # ifdef OPENSSL_SYS_MACOSX
344 # define DSO_ext ".dylib"
345 # define DSO_extlen 6
347 # define DSO_ext ".so"
348 # define DSO_extlen 3
351 static char *dlfcn_name_converter(DSO *dso, const char *filename)
354 int len, rsize, transform;
356 len = strlen(filename);
358 transform = (strstr(filename, "/") == NULL);
360 /* We will convert this to "%s.so" or "lib%s.so" etc */
361 rsize += DSO_extlen; /* The length of ".so" */
362 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
363 rsize += 3; /* The length of "lib" */
365 translated = OPENSSL_malloc(rsize);
366 if (translated == NULL) {
367 DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
371 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
372 sprintf(translated, "lib%s" DSO_ext, filename);
374 sprintf(translated, "%s" DSO_ext, filename);
376 sprintf(translated, "%s", filename);
382 This is a quote from IRIX manual for dladdr(3c):
384 <dlfcn.h> does not contain a prototype for dladdr or definition of
385 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
386 but contains no dladdr prototype and no IRIX library contains an
387 implementation. Write your own declaration based on the code below.
389 The following code is dependent on internal interfaces that are not
390 part of the IRIX compatibility guarantee; however, there is no future
391 intention to change this interface, so on a practical level, the code
392 below is safe to use on IRIX.
394 # include <rld_interface.h>
395 # ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
396 # define _RLD_INTERFACE_DLFCN_H_DLADDR
397 typedef struct Dl_info {
398 const char *dli_fname;
400 const char *dli_sname;
404 long dli_reserved[4];
407 typedef struct Dl_info Dl_info;
409 # define _RLD_DLADDR 14
411 static int dladdr(void *address, Dl_info *dl)
414 v = _rld_new_interface(_RLD_DLADDR, address, dl);
419 static int dlfcn_pathbyaddr(void *addr, char *path, int sz)
427 int (*f) (void *, char *, int);
435 if (dladdr(addr, &dli)) {
436 len = (int)strlen(dli.dli_fname);
441 memcpy(path, dli.dli_fname, len);
446 ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror());
451 static void *dlfcn_globallookup(const char *name)
453 void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
456 ret = dlsym(handle, name);
462 #endif /* DSO_DLFCN */