Import of openssl-0.9.8, a feature release.
[dragonfly.git] / crypto / openssl-0.9 / crypto / dso / dso_dlfcn.c
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56276539
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1/* dso_dlfcn.c -*- mode:C; c-file-style: "eay" -*- */
2/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
3 * project 2000.
4 */
5/* ====================================================================
6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
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
18 * distribution.
19 *
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/)"
24 *
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.
29 *
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.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
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)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
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).
56 *
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include <openssl/dso.h>
62
63#ifndef DSO_DLFCN
64DSO_METHOD *DSO_METHOD_dlfcn(void)
65 {
66 return NULL;
67 }
68#else
69
70#ifdef HAVE_DLFCN_H
71#include <dlfcn.h>
72#endif
73
74/* Part of the hack in "dlfcn_load" ... */
75#define DSO_MAX_TRANSLATED_SIZE 256
76
77static int dlfcn_load(DSO *dso);
78static int dlfcn_unload(DSO *dso);
79static void *dlfcn_bind_var(DSO *dso, const char *symname);
80static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
81#if 0
82static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
83static int dlfcn_init(DSO *dso);
84static int dlfcn_finish(DSO *dso);
85static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
86#endif
87static char *dlfcn_name_converter(DSO *dso, const char *filename);
88static char *dlfcn_merger(DSO *dso, const char *filespec1,
89 const char *filespec2);
90
91static DSO_METHOD dso_meth_dlfcn = {
92 "OpenSSL 'dlfcn' shared library method",
93 dlfcn_load,
94 dlfcn_unload,
95 dlfcn_bind_var,
96 dlfcn_bind_func,
97/* For now, "unbind" doesn't exist */
98#if 0
99 NULL, /* unbind_var */
100 NULL, /* unbind_func */
101#endif
102 NULL, /* ctrl */
103 dlfcn_name_converter,
104 dlfcn_merger,
105 NULL, /* init */
106 NULL /* finish */
107 };
108
109DSO_METHOD *DSO_METHOD_dlfcn(void)
110 {
111 return(&dso_meth_dlfcn);
112 }
113
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__)
121# ifdef DL_LAZY
122# define DLOPEN_FLAG DL_LAZY
123# else
124# ifdef RTLD_NOW
125# define DLOPEN_FLAG RTLD_NOW
126# else
127# define DLOPEN_FLAG 0
128# endif
129# endif
130#else
131# ifdef OPENSSL_SYS_SUNOS
132# define DLOPEN_FLAG 1
133# else
134# define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
135# endif
136#endif
137
138/* For this DSO_METHOD, our meth_data STACK will contain;
139 * (i) the handle (void*) returned from dlopen().
140 */
141
142static int dlfcn_load(DSO *dso)
143 {
144 void *ptr = NULL;
145 /* See applicable comments in dso_dl.c */
146 char *filename = DSO_convert_filename(dso, NULL);
147 int flags = DLOPEN_FLAG;
148
149 if(filename == NULL)
150 {
151 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
152 goto err;
153 }
154
155#ifdef RTLD_GLOBAL
156 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
157 flags |= RTLD_GLOBAL;
158#endif
159 ptr = dlopen(filename, flags);
160 if(ptr == NULL)
161 {
162 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
163 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
164 goto err;
165 }
166 if(!sk_push(dso->meth_data, (char *)ptr))
167 {
168 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
169 goto err;
170 }
171 /* Success */
172 dso->loaded_filename = filename;
173 return(1);
174err:
175 /* Cleanup! */
176 if(filename != NULL)
177 OPENSSL_free(filename);
178 if(ptr != NULL)
179 dlclose(ptr);
180 return(0);
181}
182
183static int dlfcn_unload(DSO *dso)
184 {
185 void *ptr;
186 if(dso == NULL)
187 {
188 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
189 return(0);
190 }
191 if(sk_num(dso->meth_data) < 1)
192 return(1);
193 ptr = (void *)sk_pop(dso->meth_data);
194 if(ptr == NULL)
195 {
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);
200 return(0);
201 }
202 /* For now I'm not aware of any errors associated with dlclose() */
203 dlclose(ptr);
204 return(1);
205 }
206
207static void *dlfcn_bind_var(DSO *dso, const char *symname)
208 {
209 void *ptr, *sym;
210
211 if((dso == NULL) || (symname == NULL))
212 {
213 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
214 return(NULL);
215 }
216 if(sk_num(dso->meth_data) < 1)
217 {
218 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
219 return(NULL);
220 }
221 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
222 if(ptr == NULL)
223 {
224 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
225 return(NULL);
226 }
227 sym = dlsym(ptr, symname);
228 if(sym == NULL)
229 {
230 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
231 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
232 return(NULL);
233 }
234 return(sym);
235 }
236
237static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
238 {
239 void *ptr;
240 DSO_FUNC_TYPE sym, *tsym = &sym;
241
242 if((dso == NULL) || (symname == NULL))
243 {
244 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
245 return(NULL);
246 }
247 if(sk_num(dso->meth_data) < 1)
248 {
249 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
250 return(NULL);
251 }
252 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
253 if(ptr == NULL)
254 {
255 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
256 return(NULL);
257 }
258 *(void **)(tsym) = dlsym(ptr, symname);
259 if(sym == NULL)
260 {
261 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
262 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
263 return(NULL);
264 }
265 return(sym);
266 }
267
268static char *dlfcn_merger(DSO *dso, const char *filespec1,
269 const char *filespec2)
270 {
271 char *merged;
272
273 if(!filespec1 && !filespec2)
274 {
275 DSOerr(DSO_F_DLFCN_MERGER,
276 ERR_R_PASSED_NULL_PARAMETER);
277 return(NULL);
278 }
279 /* If the first file specification is a rooted path, it rules.
280 same goes if the second file specification is missing. */
281 if (!filespec2 || filespec1[0] == '/')
282 {
283 merged = OPENSSL_malloc(strlen(filespec1) + 1);
284 if(!merged)
285 {
286 DSOerr(DSO_F_DLFCN_MERGER,
287 ERR_R_MALLOC_FAILURE);
288 return(NULL);
289 }
290 strcpy(merged, filespec1);
291 }
292 /* If the first file specification is missing, the second one rules. */
293 else if (!filespec1)
294 {
295 merged = OPENSSL_malloc(strlen(filespec2) + 1);
296 if(!merged)
297 {
298 DSOerr(DSO_F_DLFCN_MERGER,
299 ERR_R_MALLOC_FAILURE);
300 return(NULL);
301 }
302 strcpy(merged, filespec2);
303 }
304 else
305 /* This part isn't as trivial as it looks. It assumes that
306 the second file specification really is a directory, and
307 makes no checks whatsoever. Therefore, the result becomes
308 the concatenation of filespec2 followed by a slash followed
309 by filespec1. */
310 {
311 int spec2len, len;
312
313 spec2len = (filespec2 ? strlen(filespec2) : 0);
314 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
315
316 if(filespec2 && filespec2[spec2len - 1] == '/')
317 {
318 spec2len--;
319 len--;
320 }
321 merged = OPENSSL_malloc(len + 2);
322 if(!merged)
323 {
324 DSOerr(DSO_F_DLFCN_MERGER,
325 ERR_R_MALLOC_FAILURE);
326 return(NULL);
327 }
328 strcpy(merged, filespec2);
329 merged[spec2len] = '/';
330 strcpy(&merged[spec2len + 1], filespec1);
331 }
332 return(merged);
333 }
334
335static char *dlfcn_name_converter(DSO *dso, const char *filename)
336 {
337 char *translated;
338 int len, rsize, transform;
339
340 len = strlen(filename);
341 rsize = len + 1;
342 transform = (strstr(filename, "/") == NULL);
343 if(transform)
344 {
345 /* We will convert this to "%s.so" or "lib%s.so" */
346 rsize += 3; /* The length of ".so" */
347 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
348 rsize += 3; /* The length of "lib" */
349 }
350 translated = OPENSSL_malloc(rsize);
351 if(translated == NULL)
352 {
353 DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
354 DSO_R_NAME_TRANSLATION_FAILED);
355 return(NULL);
356 }
357 if(transform)
358 {
359 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
360 sprintf(translated, "lib%s.so", filename);
361 else
362 sprintf(translated, "%s.so", filename);
363 }
364 else
365 sprintf(translated, "%s", filename);
366 return(translated);
367 }
368
369#endif /* DSO_DLFCN */