Import of openssl-0.9.8, a feature release.
[dragonfly.git] / crypto / openssl-0.9 / crypto / asn1 / tasn_fre.c
1 /* tasn_fre.c */
2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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
60 #include <stddef.h>
61 #include <openssl/asn1.h>
62 #include <openssl/asn1t.h>
63 #include <openssl/objects.h>
64
65 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine);
66
67 /* Free up an ASN1 structure */
68
69 void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
70         {
71         asn1_item_combine_free(&val, it, 0);
72         }
73
74 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
75         {
76         asn1_item_combine_free(pval, it, 0);
77         }
78
79 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine)
80         {
81         const ASN1_TEMPLATE *tt = NULL, *seqtt;
82         const ASN1_EXTERN_FUNCS *ef;
83         const ASN1_COMPAT_FUNCS *cf;
84         const ASN1_AUX *aux = it->funcs;
85         ASN1_aux_cb *asn1_cb;
86         int i;
87         if (!pval)
88                 return;
89         if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
90                 return;
91         if (aux && aux->asn1_cb)
92                 asn1_cb = aux->asn1_cb;
93         else
94                 asn1_cb = 0;
95
96         switch(it->itype)
97                 {
98
99                 case ASN1_ITYPE_PRIMITIVE:
100                 if (it->templates)
101                         ASN1_template_free(pval, it->templates);
102                 else
103                         ASN1_primitive_free(pval, it);
104                 break;
105
106                 case ASN1_ITYPE_MSTRING:
107                 ASN1_primitive_free(pval, it);
108                 break;
109
110                 case ASN1_ITYPE_CHOICE:
111                 if (asn1_cb)
112                         {
113                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);
114                         if (i == 2)
115                                 return;
116                         }
117                 i = asn1_get_choice_selector(pval, it);
118                 if (asn1_cb)
119                         asn1_cb(ASN1_OP_FREE_PRE, pval, it);
120                 if ((i >= 0) && (i < it->tcount))
121                         {
122                         ASN1_VALUE **pchval;
123                         tt = it->templates + i;
124                         pchval = asn1_get_field_ptr(pval, tt);
125                         ASN1_template_free(pchval, tt);
126                         }
127                 if (asn1_cb)
128                         asn1_cb(ASN1_OP_FREE_POST, pval, it);
129                 if (!combine)
130                         {
131                         OPENSSL_free(*pval);
132                         *pval = NULL;
133                         }
134                 break;
135
136                 case ASN1_ITYPE_COMPAT:
137                 cf = it->funcs;
138                 if (cf && cf->asn1_free)
139                         cf->asn1_free(*pval);
140                 break;
141
142                 case ASN1_ITYPE_EXTERN:
143                 ef = it->funcs;
144                 if (ef && ef->asn1_ex_free)
145                         ef->asn1_ex_free(pval, it);
146                 break;
147
148                 case ASN1_ITYPE_NDEF_SEQUENCE:
149                 case ASN1_ITYPE_SEQUENCE:
150                 if (asn1_do_lock(pval, -1, it) > 0)
151                         return;
152                 if (asn1_cb)
153                         {
154                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);
155                         if (i == 2)
156                                 return;
157                         }               
158                 asn1_enc_free(pval, it);
159                 /* If we free up as normal we will invalidate any
160                  * ANY DEFINED BY field and we wont be able to 
161                  * determine the type of the field it defines. So
162                  * free up in reverse order.
163                  */
164                 tt = it->templates + it->tcount - 1;
165                 for (i = 0; i < it->tcount; tt--, i++)
166                         {
167                         ASN1_VALUE **pseqval;
168                         seqtt = asn1_do_adb(pval, tt, 0);
169                         if (!seqtt)
170                                 continue;
171                         pseqval = asn1_get_field_ptr(pval, seqtt);
172                         ASN1_template_free(pseqval, seqtt);
173                         }
174                 if (asn1_cb)
175                         asn1_cb(ASN1_OP_FREE_POST, pval, it);
176                 if (!combine)
177                         {
178                         OPENSSL_free(*pval);
179                         *pval = NULL;
180                         }
181                 break;
182                 }
183         }
184
185 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
186         {
187         int i;
188         if (tt->flags & ASN1_TFLG_SK_MASK)
189                 {
190                 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
191                 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)
192                         {
193                         ASN1_VALUE *vtmp;
194                         vtmp = sk_ASN1_VALUE_value(sk, i);
195                         asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item),
196                                                                         0);
197                         }
198                 sk_ASN1_VALUE_free(sk);
199                 *pval = NULL;
200                 }
201         else
202                 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
203                                                 tt->flags & ASN1_TFLG_COMBINE);
204         }
205
206 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
207         {
208         int utype;
209         if (it)
210                 {
211                 const ASN1_PRIMITIVE_FUNCS *pf;
212                 pf = it->funcs;
213                 if (pf && pf->prim_free)
214                         {
215                         pf->prim_free(pval, it);
216                         return;
217                         }
218                 }
219         /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
220         if (!it)
221                 {
222                 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
223                 utype = typ->type;
224                 pval = (ASN1_VALUE **)&typ->value.ptr;
225                 if (!*pval)
226                         return;
227                 }
228         else if (it->itype == ASN1_ITYPE_MSTRING)
229                 {
230                 utype = -1;
231                 if (!*pval)
232                         return;
233                 }
234         else
235                 {
236                 utype = it->utype;
237                 if ((utype != V_ASN1_BOOLEAN) && !*pval)
238                         return;
239                 }
240
241         switch(utype)
242                 {
243                 case V_ASN1_OBJECT:
244                 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
245                 break;
246
247                 case V_ASN1_BOOLEAN:
248                 if (it)
249                         *(ASN1_BOOLEAN *)pval = it->size;
250                 else
251                         *(ASN1_BOOLEAN *)pval = -1;
252                 return;
253
254                 case V_ASN1_NULL:
255                 break;
256
257                 case V_ASN1_ANY:
258                 ASN1_primitive_free(pval, NULL);
259                 OPENSSL_free(*pval);
260                 break;
261
262                 default:
263                 ASN1_STRING_free((ASN1_STRING *)*pval);
264                 *pval = NULL;
265                 break;
266                 }
267         *pval = NULL;
268         }