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 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
134 /* For this DSO_METHOD, our meth_data STACK will contain;
135 * (i) the handle (void*) returned from dlopen().
138 static int dlfcn_load(DSO *dso)
141 /* See applicable comments in dso_dl.c */
142 char *filename = DSO_convert_filename(dso, NULL);
143 int flags = DLOPEN_FLAG;
147 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
152 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
153 flags |= RTLD_GLOBAL;
155 ptr = dlopen(filename, flags);
158 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
159 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
162 if(!sk_push(dso->meth_data, (char *)ptr))
164 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
168 dso->loaded_filename = filename;
173 OPENSSL_free(filename);
179 static int dlfcn_unload(DSO *dso)
184 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
187 if(sk_num(dso->meth_data) < 1)
189 ptr = (void *)sk_pop(dso->meth_data);
192 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
193 /* Should push the value back onto the stack in
194 * case of a retry. */
195 sk_push(dso->meth_data, (char *)ptr);
198 /* For now I'm not aware of any errors associated with dlclose() */
203 static void *dlfcn_bind_var(DSO *dso, const char *symname)
207 if((dso == NULL) || (symname == NULL))
209 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
212 if(sk_num(dso->meth_data) < 1)
214 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
217 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);
226 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
227 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
233 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
238 if((dso == NULL) || (symname == NULL))
240 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
243 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);
251 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
254 sym = (DSO_FUNC_TYPE)dlsym(ptr, symname);
257 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
258 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
264 static char *dlfcn_merger(DSO *dso, const char *filespec1,
265 const char *filespec2)
269 if(!filespec1 && !filespec2)
271 DSOerr(DSO_F_DLFCN_MERGER,
272 ERR_R_PASSED_NULL_PARAMETER);
275 /* If the first file specification is a rooted path, it rules.
276 same goes if the second file specification is missing. */
277 if (!filespec2 || filespec1[0] == '/')
279 merged = OPENSSL_malloc(strlen(filespec1) + 1);
282 DSOerr(DSO_F_DLFCN_MERGER,
283 ERR_R_MALLOC_FAILURE);
286 strcpy(merged, filespec1);
288 /* If the first file specification is missing, the second one rules. */
291 merged = OPENSSL_malloc(strlen(filespec2) + 1);
294 DSOerr(DSO_F_DLFCN_MERGER,
295 ERR_R_MALLOC_FAILURE);
298 strcpy(merged, filespec2);
301 /* This part isn't as trivial as it looks. It assumes that
302 the second file specification really is a directory, and
303 makes no checks whatsoever. Therefore, the result becomes
304 the concatenation of filespec2 followed by a slash followed
309 spec2len = (filespec2 ? strlen(filespec2) : 0);
310 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
312 if(filespec2 && filespec2[spec2len - 1] == '/')
317 merged = OPENSSL_malloc(len + 2);
320 DSOerr(DSO_F_DLFCN_MERGER,
321 ERR_R_MALLOC_FAILURE);
324 strcpy(merged, filespec2);
325 merged[spec2len] = '/';
326 strcpy(&merged[spec2len + 1], filespec1);
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);
341 /* We will convert this to "%s.so" or "lib%s.so" */
342 rsize += 3; /* The length of ".so" */
343 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
344 rsize += 3; /* The length of "lib" */
346 translated = OPENSSL_malloc(rsize);
347 if(translated == NULL)
349 DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
350 DSO_R_NAME_TRANSLATION_FAILED);
355 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
356 sprintf(translated, "lib%s.so", filename);
358 sprintf(translated, "%s.so", filename);
361 sprintf(translated, "%s", filename);
365 #endif /* DSO_DLFCN */