summaryrefslogtreecommitdiff
path: root/lib/libcrypto/dso/dso_dlfcn.c
blob: 1a19164d3b1b0474a1497ee5cd8d809045580eb1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
/* dso_dlfcn.c */
/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/dso.h>

#ifndef DSO_DLFCN
DSO_METHOD *DSO_METHOD_dlfcn(void)
	{
	return NULL;
	}
#else

#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif

/* Part of the hack in "dlfcn_load" ... */
#define DSO_MAX_TRANSLATED_SIZE 256

static int dlfcn_load(DSO *dso);
static int dlfcn_unload(DSO *dso);
static void *dlfcn_bind_var(DSO *dso, const char *symname);
static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
#if 0
static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
static int dlfcn_init(DSO *dso);
static int dlfcn_finish(DSO *dso);
static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
#endif
static char *dlfcn_name_converter(DSO *dso, const char *filename);

static DSO_METHOD dso_meth_dlfcn = {
	"OpenSSL 'dlfcn' shared library method",
	dlfcn_load,
	dlfcn_unload,
	dlfcn_bind_var,
	dlfcn_bind_func,
/* For now, "unbind" doesn't exist */
#if 0
	NULL, /* unbind_var */
	NULL, /* unbind_func */
#endif
	NULL, /* ctrl */
	dlfcn_name_converter,
	NULL, /* init */
	NULL  /* finish */
	};

DSO_METHOD *DSO_METHOD_dlfcn(void)
	{
	return(&dso_meth_dlfcn);
	}

/* Prior to using the dlopen() function, we should decide on the flag
 * we send. There's a few different ways of doing this and it's a
 * messy venn-diagram to match up which platforms support what. So
 * as we don't have autoconf yet, I'm implementing a hack that could
 * be hacked further relatively easily to deal with cases as we find
 * them. Initially this is to cope with OpenBSD. */
#ifdef __OpenBSD__
#	ifdef DL_LAZY
#		define DLOPEN_FLAG DL_LAZY
#	else
#		ifdef RTLD_NOW
#			define DLOPEN_FLAG RTLD_NOW
#		else
#			define DLOPEN_FLAG 0
#		endif
#	endif
#else
#	define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
#endif

/* For this DSO_METHOD, our meth_data STACK will contain;
 * (i) the handle (void*) returned from dlopen().
 */

static int dlfcn_load(DSO *dso)
	{
	void *ptr = NULL;
	/* See applicable comments in dso_dl.c */
	char *filename = DSO_convert_filename(dso, NULL);

	if(filename == NULL)
		{
		DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
		goto err;
		}
	ptr = dlopen(filename, DLOPEN_FLAG);
	if(ptr == NULL)
		{
		DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
		ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
		goto err;
		}
	if(!sk_push(dso->meth_data, (char *)ptr))
		{
		DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
		goto err;
		}
	/* Success */
	dso->loaded_filename = filename;
	return(1);
err:
	/* Cleanup! */
	if(filename != NULL)
		OPENSSL_free(filename);
	if(ptr != NULL)
		dlclose(ptr);
	return(0);
}

static int dlfcn_unload(DSO *dso)
	{
	void *ptr;
	if(dso == NULL)
		{
		DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
		return(0);
		}
	if(sk_num(dso->meth_data) < 1)
		return(1);
	ptr = (void *)sk_pop(dso->meth_data);
	if(ptr == NULL)
		{
		DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
		/* Should push the value back onto the stack in
		 * case of a retry. */
		sk_push(dso->meth_data, (char *)ptr);
		return(0);
		}
	/* For now I'm not aware of any errors associated with dlclose() */
	dlclose(ptr);
	return(1);
	}

static void *dlfcn_bind_var(DSO *dso, const char *symname)
	{
	void *ptr, *sym;

	if((dso == NULL) || (symname == NULL))
		{
		DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
		return(NULL);
		}
	if(sk_num(dso->meth_data) < 1)
		{
		DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
		return(NULL);
		}
	ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
	if(ptr == NULL)
		{
		DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
		return(NULL);
		}
	sym = dlsym(ptr, symname);
	if(sym == NULL)
		{
		DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
		ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
		return(NULL);
		}
	return(sym);
	}

static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
	{
	void *ptr;
	DSO_FUNC_TYPE sym;

	if((dso == NULL) || (symname == NULL))
		{
		DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
		return(NULL);
		}
	if(sk_num(dso->meth_data) < 1)
		{
		DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
		return(NULL);
		}
	ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
	if(ptr == NULL)
		{
		DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
		return(NULL);
		}
	sym = (DSO_FUNC_TYPE)dlsym(ptr, symname);
	if(sym == NULL)
		{
		DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
		ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
		return(NULL);
		}
	return(sym);
	}

static char *dlfcn_name_converter(DSO *dso, const char *filename)
	{
	char *translated;
	int len, rsize, transform;

	len = strlen(filename);
	rsize = len + 1;
	transform = (strstr(filename, "/") == NULL);
	if(transform)
		{
		/* We will convert this to "%s.so" or "lib%s.so" */
		rsize += 3;	/* The length of ".so" */
		if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
			rsize += 3; /* The length of "lib" */
		}
	translated = OPENSSL_malloc(rsize);
	if(translated == NULL)
		{
		DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
				DSO_R_NAME_TRANSLATION_FAILED);
		return(NULL);
		}
	if(transform)
		{
		if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
			sprintf(translated, "lib%s.so", filename);
		else
			sprintf(translated, "%s.so", filename);
		}
	else
		sprintf(translated, "%s", filename);
	return(translated);
	}

#endif /* DSO_DLFCN */