dso_lib.c revision 272461
1/* dso_lib.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 <openssl/crypto.h>
61#include "cryptlib.h"
62#include <openssl/dso.h>
63
64static DSO_METHOD *default_DSO_meth = NULL;
65
66DSO *DSO_new(void)
67	{
68	return(DSO_new_method(NULL));
69	}
70
71void DSO_set_default_method(DSO_METHOD *meth)
72	{
73	default_DSO_meth = meth;
74	}
75
76DSO_METHOD *DSO_get_default_method(void)
77	{
78	return(default_DSO_meth);
79	}
80
81DSO_METHOD *DSO_get_method(DSO *dso)
82	{
83	return(dso->meth);
84	}
85
86DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth)
87	{
88	DSO_METHOD *mtmp;
89	mtmp = dso->meth;
90	dso->meth = meth;
91	return(mtmp);
92	}
93
94DSO *DSO_new_method(DSO_METHOD *meth)
95	{
96	DSO *ret;
97
98	if(default_DSO_meth == NULL)
99		/* We default to DSO_METH_openssl() which in turn defaults
100		 * to stealing the "best available" method. Will fallback
101		 * to DSO_METH_null() in the worst case. */
102		default_DSO_meth = DSO_METHOD_openssl();
103	ret = (DSO *)OPENSSL_malloc(sizeof(DSO));
104	if(ret == NULL)
105		{
106		DSOerr(DSO_F_DSO_NEW_METHOD,ERR_R_MALLOC_FAILURE);
107		return(NULL);
108		}
109	memset(ret, 0, sizeof(DSO));
110	ret->meth_data = sk_void_new_null();
111	if(ret->meth_data == NULL)
112		{
113		/* sk_new doesn't generate any errors so we do */
114		DSOerr(DSO_F_DSO_NEW_METHOD,ERR_R_MALLOC_FAILURE);
115		OPENSSL_free(ret);
116		return(NULL);
117		}
118	if(meth == NULL)
119		ret->meth = default_DSO_meth;
120	else
121		ret->meth = meth;
122	ret->references = 1;
123	if((ret->meth->init != NULL) && !ret->meth->init(ret))
124		{
125		OPENSSL_free(ret);
126		ret=NULL;
127		}
128	return(ret);
129	}
130
131int DSO_free(DSO *dso)
132	{
133        int i;
134
135	if(dso == NULL)
136		{
137		DSOerr(DSO_F_DSO_FREE,ERR_R_PASSED_NULL_PARAMETER);
138		return(0);
139		}
140
141	i=CRYPTO_add(&dso->references,-1,CRYPTO_LOCK_DSO);
142#ifdef REF_PRINT
143	REF_PRINT("DSO",dso);
144#endif
145	if(i > 0) return(1);
146#ifdef REF_CHECK
147	if(i < 0)
148		{
149		fprintf(stderr,"DSO_free, bad reference count\n");
150		abort();
151		}
152#endif
153
154	if((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso))
155		{
156		DSOerr(DSO_F_DSO_FREE,DSO_R_UNLOAD_FAILED);
157		return(0);
158		}
159
160	if((dso->meth->finish != NULL) && !dso->meth->finish(dso))
161		{
162		DSOerr(DSO_F_DSO_FREE,DSO_R_FINISH_FAILED);
163		return(0);
164		}
165
166	sk_void_free(dso->meth_data);
167	if(dso->filename != NULL)
168		OPENSSL_free(dso->filename);
169	if(dso->loaded_filename != NULL)
170		OPENSSL_free(dso->loaded_filename);
171
172	OPENSSL_free(dso);
173	return(1);
174	}
175
176int DSO_flags(DSO *dso)
177	{
178	return((dso == NULL) ? 0 : dso->flags);
179	}
180
181
182int DSO_up_ref(DSO *dso)
183	{
184	if (dso == NULL)
185		{
186		DSOerr(DSO_F_DSO_UP_REF,ERR_R_PASSED_NULL_PARAMETER);
187		return(0);
188		}
189
190	CRYPTO_add(&dso->references,1,CRYPTO_LOCK_DSO);
191	return(1);
192	}
193
194DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
195	{
196	DSO *ret;
197	int allocated = 0;
198
199	if(dso == NULL)
200		{
201		ret = DSO_new_method(meth);
202		if(ret == NULL)
203			{
204			DSOerr(DSO_F_DSO_LOAD,ERR_R_MALLOC_FAILURE);
205			goto err;
206			}
207		allocated = 1;
208		/* Pass the provided flags to the new DSO object */
209		if(DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0)
210			{
211			DSOerr(DSO_F_DSO_LOAD,DSO_R_CTRL_FAILED);
212			goto err;
213			}
214		}
215	else
216		ret = dso;
217	/* Don't load if we're currently already loaded */
218	if(ret->filename != NULL)
219		{
220		DSOerr(DSO_F_DSO_LOAD,DSO_R_DSO_ALREADY_LOADED);
221		goto err;
222		}
223	/* filename can only be NULL if we were passed a dso that already has
224	 * one set. */
225	if(filename != NULL)
226		if(!DSO_set_filename(ret, filename))
227			{
228			DSOerr(DSO_F_DSO_LOAD,DSO_R_SET_FILENAME_FAILED);
229			goto err;
230			}
231	filename = ret->filename;
232	if(filename == NULL)
233		{
234		DSOerr(DSO_F_DSO_LOAD,DSO_R_NO_FILENAME);
235		goto err;
236		}
237	if(ret->meth->dso_load == NULL)
238		{
239		DSOerr(DSO_F_DSO_LOAD,DSO_R_UNSUPPORTED);
240		goto err;
241		}
242	if(!ret->meth->dso_load(ret))
243		{
244		DSOerr(DSO_F_DSO_LOAD,DSO_R_LOAD_FAILED);
245		goto err;
246		}
247	/* Load succeeded */
248	return(ret);
249err:
250	if(allocated)
251		DSO_free(ret);
252	return(NULL);
253	}
254
255void *DSO_bind_var(DSO *dso, const char *symname)
256	{
257	void *ret = NULL;
258
259	if((dso == NULL) || (symname == NULL))
260		{
261		DSOerr(DSO_F_DSO_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
262		return(NULL);
263		}
264	if(dso->meth->dso_bind_var == NULL)
265		{
266		DSOerr(DSO_F_DSO_BIND_VAR,DSO_R_UNSUPPORTED);
267		return(NULL);
268		}
269	if((ret = dso->meth->dso_bind_var(dso, symname)) == NULL)
270		{
271		DSOerr(DSO_F_DSO_BIND_VAR,DSO_R_SYM_FAILURE);
272		return(NULL);
273		}
274	/* Success */
275	return(ret);
276	}
277
278DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
279	{
280	DSO_FUNC_TYPE ret = NULL;
281
282	if((dso == NULL) || (symname == NULL))
283		{
284		DSOerr(DSO_F_DSO_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
285		return(NULL);
286		}
287	if(dso->meth->dso_bind_func == NULL)
288		{
289		DSOerr(DSO_F_DSO_BIND_FUNC,DSO_R_UNSUPPORTED);
290		return(NULL);
291		}
292	if((ret = dso->meth->dso_bind_func(dso, symname)) == NULL)
293		{
294		DSOerr(DSO_F_DSO_BIND_FUNC,DSO_R_SYM_FAILURE);
295		return(NULL);
296		}
297	/* Success */
298	return(ret);
299	}
300
301/* I don't really like these *_ctrl functions very much to be perfectly
302 * honest. For one thing, I think I have to return a negative value for
303 * any error because possible DSO_ctrl() commands may return values
304 * such as "size"s that can legitimately be zero (making the standard
305 * "if(DSO_cmd(...))" form that works almost everywhere else fail at
306 * odd times. I'd prefer "output" values to be passed by reference and
307 * the return value as success/failure like usual ... but we conform
308 * when we must... :-) */
309long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
310	{
311	if(dso == NULL)
312		{
313		DSOerr(DSO_F_DSO_CTRL,ERR_R_PASSED_NULL_PARAMETER);
314		return(-1);
315		}
316	/* We should intercept certain generic commands and only pass control
317	 * to the method-specific ctrl() function if it's something we don't
318	 * handle. */
319	switch(cmd)
320		{
321	case DSO_CTRL_GET_FLAGS:
322		return dso->flags;
323	case DSO_CTRL_SET_FLAGS:
324		dso->flags = (int)larg;
325		return(0);
326	case DSO_CTRL_OR_FLAGS:
327		dso->flags |= (int)larg;
328		return(0);
329	default:
330		break;
331		}
332	if((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL))
333		{
334		DSOerr(DSO_F_DSO_CTRL,DSO_R_UNSUPPORTED);
335		return(-1);
336		}
337	return(dso->meth->dso_ctrl(dso,cmd,larg,parg));
338	}
339
340int DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb,
341			DSO_NAME_CONVERTER_FUNC *oldcb)
342	{
343	if(dso == NULL)
344		{
345		DSOerr(DSO_F_DSO_SET_NAME_CONVERTER,
346				ERR_R_PASSED_NULL_PARAMETER);
347		return(0);
348		}
349	if(oldcb)
350		*oldcb = dso->name_converter;
351	dso->name_converter = cb;
352	return(1);
353	}
354
355const char *DSO_get_filename(DSO *dso)
356	{
357	if(dso == NULL)
358		{
359		DSOerr(DSO_F_DSO_GET_FILENAME,ERR_R_PASSED_NULL_PARAMETER);
360		return(NULL);
361		}
362	return(dso->filename);
363	}
364
365int DSO_set_filename(DSO *dso, const char *filename)
366	{
367	char *copied;
368
369	if((dso == NULL) || (filename == NULL))
370		{
371		DSOerr(DSO_F_DSO_SET_FILENAME,ERR_R_PASSED_NULL_PARAMETER);
372		return(0);
373		}
374	if(dso->loaded_filename)
375		{
376		DSOerr(DSO_F_DSO_SET_FILENAME,DSO_R_DSO_ALREADY_LOADED);
377		return(0);
378		}
379	/* We'll duplicate filename */
380	copied = OPENSSL_malloc(strlen(filename) + 1);
381	if(copied == NULL)
382		{
383		DSOerr(DSO_F_DSO_SET_FILENAME,ERR_R_MALLOC_FAILURE);
384		return(0);
385		}
386	BUF_strlcpy(copied, filename, strlen(filename) + 1);
387	if(dso->filename)
388		OPENSSL_free(dso->filename);
389	dso->filename = copied;
390	return(1);
391	}
392
393char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
394	{
395	char *result = NULL;
396
397	if(dso == NULL || filespec1 == NULL)
398		{
399		DSOerr(DSO_F_DSO_MERGE,ERR_R_PASSED_NULL_PARAMETER);
400		return(NULL);
401		}
402	if((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0)
403		{
404		if(dso->merger != NULL)
405			result = dso->merger(dso, filespec1, filespec2);
406		else if(dso->meth->dso_merger != NULL)
407			result = dso->meth->dso_merger(dso,
408				filespec1, filespec2);
409		}
410	return(result);
411	}
412
413char *DSO_convert_filename(DSO *dso, const char *filename)
414	{
415	char *result = NULL;
416
417	if(dso == NULL)
418		{
419		DSOerr(DSO_F_DSO_CONVERT_FILENAME,ERR_R_PASSED_NULL_PARAMETER);
420		return(NULL);
421		}
422	if(filename == NULL)
423		filename = dso->filename;
424	if(filename == NULL)
425		{
426		DSOerr(DSO_F_DSO_CONVERT_FILENAME,DSO_R_NO_FILENAME);
427		return(NULL);
428		}
429	if((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0)
430		{
431		if(dso->name_converter != NULL)
432			result = dso->name_converter(dso, filename);
433		else if(dso->meth->dso_name_converter != NULL)
434			result = dso->meth->dso_name_converter(dso, filename);
435		}
436	if(result == NULL)
437		{
438		result = OPENSSL_malloc(strlen(filename) + 1);
439		if(result == NULL)
440			{
441			DSOerr(DSO_F_DSO_CONVERT_FILENAME,
442					ERR_R_MALLOC_FAILURE);
443			return(NULL);
444			}
445		BUF_strlcpy(result, filename, strlen(filename) + 1);
446		}
447	return(result);
448	}
449
450const char *DSO_get_loaded_filename(DSO *dso)
451	{
452	if(dso == NULL)
453		{
454		DSOerr(DSO_F_DSO_GET_LOADED_FILENAME,
455				ERR_R_PASSED_NULL_PARAMETER);
456		return(NULL);
457		}
458	return(dso->loaded_filename);
459	}
460
461int DSO_pathbyaddr(void *addr,char *path,int sz)
462	{
463	DSO_METHOD *meth = default_DSO_meth;
464	if (meth == NULL) meth = DSO_METHOD_openssl();
465	if (meth->pathbyaddr == NULL)
466		{
467		DSOerr(DSO_F_DSO_PATHBYADDR,DSO_R_UNSUPPORTED);
468		return -1;
469		}
470	return (*meth->pathbyaddr)(addr,path,sz);
471	}
472
473void *DSO_global_lookup(const char *name)
474	{
475	DSO_METHOD *meth = default_DSO_meth;
476	if (meth == NULL) meth = DSO_METHOD_openssl();
477	if (meth->globallookup == NULL)
478		{
479		DSOerr(DSO_F_DSO_GLOBAL_LOOKUP,DSO_R_UNSUPPORTED);
480		return NULL;
481		}
482	return (*meth->globallookup)(name);
483	}
484