1 /* dso_dl.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Written by Richard Levitte (richard@levitte.org) 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_DL
64 DSO_METHOD *DSO_METHOD_dl(void)
65 {
66 return NULL;
67 }
68 #else
69
70 #include <dl.h>
71
72 /* Part of the hack in "dl_load" ... */
73 #define DSO_MAX_TRANSLATED_SIZE 256
74
75 static int dl_load(DSO *dso);
76 static int dl_unload(DSO *dso);
77 static void *dl_bind_var(DSO *dso, const char *symname);
78 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname);
79 #if 0
80 static int dl_unbind_var(DSO *dso, char *symname, void *symptr);
81 static int dl_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
82 static int dl_init(DSO *dso);
83 static int dl_finish(DSO *dso);
84 static int dl_ctrl(DSO *dso, int cmd, long larg, void *parg);
85 #endif
86 static char *dl_name_converter(DSO *dso, const char *filename);
87 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2);
88 static int dl_pathbyaddr(void *addr,char *path,int sz);
89 static void *dl_globallookup(const char *name);
90
91 static DSO_METHOD dso_meth_dl = {
92 "OpenSSL 'dl' shared library method",
93 dl_load,
94 dl_unload,
95 dl_bind_var,
96 dl_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 dl_name_converter,
104 dl_merger,
105 NULL, /* init */
106 NULL, /* finish */
107 dl_pathbyaddr,
108 dl_globallookup
109 };
110
111 DSO_METHOD *DSO_METHOD_dl(void)
112 {
113 return(&dso_meth_dl);
114 }
115
116 /* For this DSO_METHOD, our meth_data STACK will contain;
117 * (i) the handle (shl_t) returned from shl_load().
118 * NB: I checked on HPUX11 and shl_t is itself a pointer
119 * type so the cast is safe.
120 */
121
122 static int dl_load(DSO *dso)
123 {
124 shl_t ptr = NULL;
125 /* We don't do any fancy retries or anything, just take the method's
126 * (or DSO's if it has the callback set) best translation of the
127 * platform-independant filename and try once with that. */
128 char *filename= DSO_convert_filename(dso, NULL);
129
130 if(filename == NULL)
131 {
132 DSOerr(DSO_F_DL_LOAD,DSO_R_NO_FILENAME);
133 goto err;
134 }
135 ptr = shl_load(filename, BIND_IMMEDIATE |
136 (dso->flags&DSO_FLAG_NO_NAME_TRANSLATION?0:DYNAMIC_PATH), 0L);
137 if(ptr == NULL)
138 {
139 DSOerr(DSO_F_DL_LOAD,DSO_R_LOAD_FAILED);
140 ERR_add_error_data(4, "filename(", filename, "): ",
141 strerror(errno));
142 goto err;
143 }
144 if(!sk_push(dso->meth_data, (char *)ptr))
145 {
146 DSOerr(DSO_F_DL_LOAD,DSO_R_STACK_ERROR);
147 goto err;
148 }
149 /* Success, stick the converted filename we've loaded under into the DSO
150 * (it also serves as the indicator that we are currently loaded). */
151 dso->loaded_filename = filename;
152 return(1);
153 err:
154 /* Cleanup! */
155 if(filename != NULL)
156 OPENSSL_free(filename);
157 if(ptr != NULL)
158 shl_unload(ptr);
159 return(0);
160 }
161
162 static int dl_unload(DSO *dso)
163 {
164 shl_t ptr;
165 if(dso == NULL)
166 {
167 DSOerr(DSO_F_DL_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
168 return(0);
169 }
170 if(sk_num(dso->meth_data) < 1)
171 return(1);
172 /* Is this statement legal? */
173 ptr = (shl_t)sk_pop(dso->meth_data);
174 if(ptr == NULL)
175 {
176 DSOerr(DSO_F_DL_UNLOAD,DSO_R_NULL_HANDLE);
177 /* Should push the value back onto the stack in
178 * case of a retry. */
179 sk_push(dso->meth_data, (char *)ptr);
180 return(0);
181 }
182 shl_unload(ptr);
183 return(1);
184 }
185
186 static void *dl_bind_var(DSO *dso, const char *symname)
187 {
188 shl_t ptr;
189 void *sym;
190
191 if((dso == NULL) || (symname == NULL))
192 {
193 DSOerr(DSO_F_DL_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
194 return(NULL);
195 }
196 if(sk_num(dso->meth_data) < 1)
197 {
198 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_STACK_ERROR);
199 return(NULL);
200 }
201 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
202 if(ptr == NULL)
203 {
204 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_NULL_HANDLE);
205 return(NULL);
206 }
207 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0)
208 {
209 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_SYM_FAILURE);
210 ERR_add_error_data(4, "symname(", symname, "): ",
211 strerror(errno));
212 return(NULL);
213 }
214 return(sym);
215 }
216
217 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname)
218 {
219 shl_t ptr;
220 void *sym;
221
222 if((dso == NULL) || (symname == NULL))
223 {
224 DSOerr(DSO_F_DL_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
225 return(NULL);
226 }
227 if(sk_num(dso->meth_data) < 1)
228 {
229 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_STACK_ERROR);
230 return(NULL);
231 }
232 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
233 if(ptr == NULL)
234 {
235 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_NULL_HANDLE);
236 return(NULL);
237 }
238 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0)
239 {
240 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_SYM_FAILURE);
241 ERR_add_error_data(4, "symname(", symname, "): ",
242 strerror(errno));
243 return(NULL);
244 }
245 return((DSO_FUNC_TYPE)sym);
246 }
247
248 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2)
249 {
250 char *merged;
251
252 if(!filespec1 && !filespec2)
253 {
254 DSOerr(DSO_F_DL_MERGER,
255 ERR_R_PASSED_NULL_PARAMETER);
256 return(NULL);
257 }
258 /* If the first file specification is a rooted path, it rules.
259 same goes if the second file specification is missing. */
260 if (!filespec2 || filespec1[0] == '/')
261 {
262 merged = OPENSSL_malloc(strlen(filespec1) + 1);
263 if(!merged)
264 {
265 DSOerr(DSO_F_DL_MERGER,
266 ERR_R_MALLOC_FAILURE);
267 return(NULL);
268 }
269 strcpy(merged, filespec1);
270 }
271 /* If the first file specification is missing, the second one rules. */
272 else if (!filespec1)
273 {
274 merged = OPENSSL_malloc(strlen(filespec2) + 1);
275 if(!merged)
276 {
277 DSOerr(DSO_F_DL_MERGER,
278 ERR_R_MALLOC_FAILURE);
279 return(NULL);
280 }
281 strcpy(merged, filespec2);
282 }
283 else
284 /* This part isn't as trivial as it looks. It assumes that
285 the second file specification really is a directory, and
286 makes no checks whatsoever. Therefore, the result becomes
287 the concatenation of filespec2 followed by a slash followed
288 by filespec1. */
289 {
290 int spec2len, len;
291
292 spec2len = (filespec2 ? strlen(filespec2) : 0);
293 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
294
295 if(filespec2 && filespec2[spec2len - 1] == '/')
296 {
297 spec2len--;
298 len--;
299 }
300 merged = OPENSSL_malloc(len + 2);
301 if(!merged)
302 {
303 DSOerr(DSO_F_DL_MERGER,
304 ERR_R_MALLOC_FAILURE);
305 return(NULL);
306 }
307 strcpy(merged, filespec2);
308 merged[spec2len] = '/';
309 strcpy(&merged[spec2len + 1], filespec1);
310 }
311 return(merged);
312 }
313
314 /* This function is identical to the one in dso_dlfcn.c, but as it is highly
315 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at the
316 * same time, there's no great duplicating the code. Figuring out an elegant
317 * way to share one copy of the code would be more difficult and would not
318 * leave the implementations independant. */
319 #if defined(__hpux)
320 static const char extension[] = ".sl";
321 #else
322 static const char extension[] = ".so";
323 #endif
324 static char *dl_name_converter(DSO *dso, const char *filename)
325 {
326 char *translated;
327 int len, rsize, transform;
328
329 len = strlen(filename);
330 rsize = len + 1;
331 transform = (strstr(filename, "/") == NULL);
332 {
333 /* We will convert this to "%s.s?" or "lib%s.s?" */
334 rsize += strlen(extension);/* The length of ".s?" */
335 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
336 rsize += 3; /* The length of "lib" */
337 }
338 translated = OPENSSL_malloc(rsize);
339 if(translated == NULL)
340 {
341 DSOerr(DSO_F_DL_NAME_CONVERTER,
342 DSO_R_NAME_TRANSLATION_FAILED);
343 return(NULL);
344 }
345 if(transform)
346 {
347 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
348 sprintf(translated, "lib%s%s", filename, extension);
349 else
350 sprintf(translated, "%s%s", filename, extension);
351 }
352 else
353 sprintf(translated, "%s", filename);
354 return(translated);
355 }
356
357 static int dl_pathbyaddr(void *addr,char *path,int sz)
358 {
359 struct shl_descriptor inf;
360 int i,len;
361
362 if (addr == NULL)
363 {
364 union { int(*f)(void*,char*,int); void *p; } t =
365 { dl_pathbyaddr };
366 addr = t.p;
367 }
368
369 for (i=-1;shl_get_r(i,&inf)==0;i++)
370 {
371 if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) ||
372 ((size_t)addr >= inf.dstart && (size_t)addr < inf.dend))
373 {
374 len = (int)strlen(inf.filename);
375 if (sz <= 0) return len+1;
376 if (len >= sz) len=sz-1;
377 memcpy(path,inf.filename,len);
378 path[len++] = 0;
379 return len;
380 }
381 }
382
383 return -1;
384 }
385
386 static void *dl_globallookup(const char *name)
387 {
388 void *ret;
389 shl_t h = NULL;
390
391 return shl_findsym(&h,name,TYPE_UNDEFINED,&ret) ? NULL : ret;
392 }
393 #endif /* DSO_DL */