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
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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
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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).
62 #include <openssl/dso.h>
65 DSO_METHOD *DSO_METHOD_dlfcn(void)
75 /* Part of the hack in "dlfcn_load" ... */
76 # define DSO_MAX_TRANSLATED_SIZE 256
78 static int dlfcn_load(DSO *dso);
79 static int dlfcn_unload(DSO *dso);
80 static void *dlfcn_bind_var(DSO *dso, const char *symname);
81 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
83 static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
84 static int dlfcn_init(DSO *dso);
85 static int dlfcn_finish(DSO *dso);
86 static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
88 static char *dlfcn_name_converter(DSO *dso, const char *filename);
89 static char *dlfcn_merger(DSO *dso, const char *filespec1,
90 const char *filespec2);
92 static DSO_METHOD dso_meth_dlfcn = {
93 "OpenSSL 'dlfcn' shared library method",
98 /* For now, "unbind" doesn't exist */
100 NULL, /* unbind_var */
101 NULL, /* unbind_func */
104 dlfcn_name_converter,
110 DSO_METHOD *DSO_METHOD_dlfcn(void)
112 return (&dso_meth_dlfcn);
116 * Prior to using the dlopen() function, we should decide on the flag we
117 * send. There's a few different ways of doing this and it's a messy
118 * venn-diagram to match up which platforms support what. So as we don't have
119 * autoconf yet, I'm implementing a hack that could be hacked further
120 * relatively easily to deal with cases as we find them. Initially this is to
123 # if defined(__OpenBSD__) || defined(__NetBSD__)
125 # define DLOPEN_FLAG DL_LAZY
128 # define DLOPEN_FLAG RTLD_NOW
130 # define DLOPEN_FLAG 0
134 # ifdef OPENSSL_SYS_SUNOS
135 # define DLOPEN_FLAG 1
137 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
142 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
143 * (void*) returned from dlopen().
146 static int dlfcn_load(DSO *dso)
149 /* See applicable comments in dso_dl.c */
150 char *filename = DSO_convert_filename(dso, NULL);
151 int flags = DLOPEN_FLAG;
153 if (filename == NULL) {
154 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME);
158 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
159 flags |= RTLD_GLOBAL;
161 ptr = dlopen(filename, flags);
163 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED);
164 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
167 if (!sk_push(dso->meth_data, (char *)ptr)) {
168 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR);
172 dso->loaded_filename = filename;
176 if (filename != NULL)
177 OPENSSL_free(filename);
183 static int dlfcn_unload(DSO *dso)
187 DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
190 if (sk_num(dso->meth_data) < 1)
192 ptr = (void *)sk_pop(dso->meth_data);
194 DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
196 * Should push the value back onto the stack in case of a retry.
198 sk_push(dso->meth_data, (char *)ptr);
201 /* For now I'm not aware of any errors associated with dlclose() */
206 static void *dlfcn_bind_var(DSO *dso, const char *symname)
210 if ((dso == NULL) || (symname == NULL)) {
211 DSOerr(DSO_F_DLFCN_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER);
214 if (sk_num(dso->meth_data) < 1) {
215 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_STACK_ERROR);
218 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
220 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_NULL_HANDLE);
223 sym = dlsym(ptr, symname);
225 DSOerr(DSO_F_DLFCN_BIND_VAR, DSO_R_SYM_FAILURE);
226 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
232 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
240 if ((dso == NULL) || (symname == NULL)) {
241 DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
244 if (sk_num(dso->meth_data) < 1) {
245 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
248 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
250 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
253 u.dlret = dlsym(ptr, symname);
254 if (u.dlret == NULL) {
255 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
256 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
262 static char *dlfcn_merger(DSO *dso, const char *filespec1,
263 const char *filespec2)
267 if (!filespec1 && !filespec2) {
268 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
272 * If the first file specification is a rooted path, it rules. same goes
273 * if the second file specification is missing.
275 if (!filespec2 || filespec1[0] == '/') {
276 merged = OPENSSL_malloc(strlen(filespec1) + 1);
278 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
281 strcpy(merged, filespec1);
284 * If the first file specification is missing, the second one rules.
286 else if (!filespec1) {
287 merged = OPENSSL_malloc(strlen(filespec2) + 1);
289 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
292 strcpy(merged, filespec2);
295 * This part isn't as trivial as it looks. It assumes that the
296 * second file specification really is a directory, and makes no
297 * checks whatsoever. Therefore, the result becomes the
298 * concatenation of filespec2 followed by a slash followed by
304 spec2len = (filespec2 ? strlen(filespec2) : 0);
305 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
307 if (filespec2 && filespec2[spec2len - 1] == '/') {
311 merged = OPENSSL_malloc(len + 2);
313 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
316 strcpy(merged, filespec2);
317 merged[spec2len] = '/';
318 strcpy(&merged[spec2len + 1], filespec1);
323 # ifdef OPENSSL_SYS_MACOSX
324 # define DSO_ext ".dylib"
325 # define DSO_extlen 6
327 # define DSO_ext ".so"
328 # define DSO_extlen 3
331 static char *dlfcn_name_converter(DSO *dso, const char *filename)
334 int len, rsize, transform;
336 len = strlen(filename);
338 transform = (strstr(filename, "/") == NULL);
340 /* We will convert this to "%s.so" or "lib%s.so" etc */
341 rsize += DSO_extlen; /* The length of ".so" */
342 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
343 rsize += 3; /* The length of "lib" */
345 translated = OPENSSL_malloc(rsize);
346 if (translated == NULL) {
347 DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
351 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
352 sprintf(translated, "lib%s" DSO_ext, filename);
354 sprintf(translated, "%s" DSO_ext, filename);
356 sprintf(translated, "%s", filename);
360 #endif /* DSO_DLFCN */