1 /* dso_dlfcn.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
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)
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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).
61 #include <openssl/dso.h>
64 DSO_METHOD *DSO_METHOD_dlfcn(void)
74 /* Part of the hack in "dlfcn_load" ... */
75 #define DSO_MAX_TRANSLATED_SIZE 256
77 static int dlfcn_load(DSO *dso);
78 static int dlfcn_unload(DSO *dso);
79 static void *dlfcn_bind_var(DSO *dso, const char *symname);
80 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
82 static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
83 static int dlfcn_init(DSO *dso);
84 static int dlfcn_finish(DSO *dso);
85 static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
87 static char *dlfcn_name_converter(DSO *dso, const char *filename);
88 static char *dlfcn_merger(DSO *dso, const char *filespec1,
89 const char *filespec2);
91 static DSO_METHOD dso_meth_dlfcn = {
92 "OpenSSL 'dlfcn' shared library method",
97 /* For now, "unbind" doesn't exist */
99 NULL, /* unbind_var */
100 NULL, /* unbind_func */
103 dlfcn_name_converter,
109 DSO_METHOD *DSO_METHOD_dlfcn(void)
111 return(&dso_meth_dlfcn);
114 /* Prior to using the dlopen() function, we should decide on the flag
115 * we send. There's a few different ways of doing this and it's a
116 * messy venn-diagram to match up which platforms support what. So
117 * as we don't have autoconf yet, I'm implementing a hack that could
118 * be hacked further relatively easily to deal with cases as we find
119 * them. Initially this is to cope with OpenBSD. */
120 #if defined(__OpenBSD__) || defined(__NetBSD__)
122 # define DLOPEN_FLAG DL_LAZY
125 # define DLOPEN_FLAG RTLD_NOW
127 # define DLOPEN_FLAG 0
131 # ifdef OPENSSL_SYS_SUNOS
132 # define DLOPEN_FLAG 1
134 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
138 /* For this DSO_METHOD, our meth_data STACK will contain;
139 * (i) the handle (void*) returned from dlopen().
142 static int dlfcn_load(DSO *dso)
145 /* See applicable comments in dso_dl.c */
146 char *filename = DSO_convert_filename(dso, NULL);
147 int flags = DLOPEN_FLAG;
151 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
156 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
157 flags |= RTLD_GLOBAL;
159 ptr = dlopen(filename, flags);
162 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
163 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
166 if(!sk_push(dso->meth_data, (char *)ptr))
168 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
172 dso->loaded_filename = filename;
177 OPENSSL_free(filename);
183 static int dlfcn_unload(DSO *dso)
188 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
191 if(sk_num(dso->meth_data) < 1)
193 ptr = (void *)sk_pop(dso->meth_data);
196 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
197 /* Should push the value back onto the stack in
198 * case of a retry. */
199 sk_push(dso->meth_data, (char *)ptr);
202 /* For now I'm not aware of any errors associated with dlclose() */
207 static void *dlfcn_bind_var(DSO *dso, const char *symname)
211 if((dso == NULL) || (symname == NULL))
213 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
216 if(sk_num(dso->meth_data) < 1)
218 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
221 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
224 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
227 sym = dlsym(ptr, symname);
230 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
231 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
237 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
245 if((dso == NULL) || (symname == NULL))
247 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
250 if(sk_num(dso->meth_data) < 1)
252 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
255 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
258 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
261 u.dlret = dlsym(ptr, symname);
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)
278 DSOerr(DSO_F_DLFCN_MERGER,
279 ERR_R_PASSED_NULL_PARAMETER);
282 /* If the first file specification is a rooted path, it rules.
283 same goes if the second file specification is missing. */
284 if (!filespec2 || filespec1[0] == '/')
286 merged = OPENSSL_malloc(strlen(filespec1) + 1);
289 DSOerr(DSO_F_DLFCN_MERGER,
290 ERR_R_MALLOC_FAILURE);
293 strcpy(merged, filespec1);
295 /* If the first file specification is missing, the second one rules. */
298 merged = OPENSSL_malloc(strlen(filespec2) + 1);
301 DSOerr(DSO_F_DLFCN_MERGER,
302 ERR_R_MALLOC_FAILURE);
305 strcpy(merged, filespec2);
308 /* This part isn't as trivial as it looks. It assumes that
309 the second file specification really is a directory, and
310 makes no checks whatsoever. Therefore, the result becomes
311 the concatenation of filespec2 followed by a slash followed
316 spec2len = (filespec2 ? strlen(filespec2) : 0);
317 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
319 if(filespec2 && filespec2[spec2len - 1] == '/')
324 merged = OPENSSL_malloc(len + 2);
327 DSOerr(DSO_F_DLFCN_MERGER,
328 ERR_R_MALLOC_FAILURE);
331 strcpy(merged, filespec2);
332 merged[spec2len] = '/';
333 strcpy(&merged[spec2len + 1], filespec1);
338 #ifdef OPENSSL_SYS_MACOSX
339 #define DSO_ext ".dylib"
342 #define DSO_ext ".so"
347 static char *dlfcn_name_converter(DSO *dso, const char *filename)
350 int len, rsize, transform;
352 len = strlen(filename);
354 transform = (strstr(filename, "/") == NULL);
357 /* We will convert this to "%s.so" or "lib%s.so" etc */
358 rsize += DSO_extlen; /* The length of ".so" */
359 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
360 rsize += 3; /* The length of "lib" */
362 translated = OPENSSL_malloc(rsize);
363 if(translated == NULL)
365 DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
366 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);
377 sprintf(translated, "%s", filename);
381 #endif /* DSO_DLFCN */