crypto/openssl-0.9.7d/crypto/asn1/a_d2i_fp.c

   1 /* crypto/asn1/a_d2i_fp.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/buffer.h>
  62 #include <openssl/asn1_mac.h>
  63
  64 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
  65
  66 #ifndef NO_OLD_ASN1
  67 #ifndef OPENSSL_NO_FP_API
  68
  69 char *ASN1_d2i_fp(char *(*xnew)(), char *(*d2i)(), FILE *in,
  70              unsigned char **x)
  71         {
  72         BIO *b;
  73         char *ret;
  74
  75         if ((b=BIO_new(BIO_s_file())) == NULL)
  76                 {
  77                 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);
  78                 return(NULL);
  79                 }
  80         BIO_set_fp(b,in,BIO_NOCLOSE);
  81         ret=ASN1_d2i_bio(xnew,d2i,b,x);
  82         BIO_free(b);
  83         return(ret);
  84         }
  85 #endif
  86
  87 char *ASN1_d2i_bio(char *(*xnew)(), char *(*d2i)(), BIO *in,
  88              unsigned char **x)
  89         {
  90         BUF_MEM *b = NULL;
  91         unsigned char *p;
  92         char *ret=NULL;
  93         int len;
  94
  95         len = asn1_d2i_read_bio(in, &b);
  96         if(len < 0) goto err;
  97
  98         p=(unsigned char *)b->data;
  99         ret=d2i(x,&p,len);
 100 err:
 101         if (b != NULL) BUF_MEM_free(b);
 102         return(ret);
 103         }
 104
 105 #endif
 106
 107 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
 108         {
 109         BUF_MEM *b = NULL;
 110         unsigned char *p;
 111         void *ret=NULL;
 112         int len;
 113
 114         len = asn1_d2i_read_bio(in, &b);
 115         if(len < 0) goto err;
 116
 117         p=(unsigned char *)b->data;
 118         ret=ASN1_item_d2i(x,&p,len, it);
 119 err:
 120         if (b != NULL) BUF_MEM_free(b);
 121         return(ret);
 122         }
 123
 124 #ifndef OPENSSL_NO_FP_API
 125 void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
 126         {
 127         BIO *b;
 128         char *ret;
 129
 130         if ((b=BIO_new(BIO_s_file())) == NULL)
 131                 {
 132                 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);
 133                 return(NULL);
 134                 }
 135         BIO_set_fp(b,in,BIO_NOCLOSE);
 136         ret=ASN1_item_d2i_bio(it,b,x);
 137         BIO_free(b);
 138         return(ret);
 139         }
 140 #endif
 141
 142 #define HEADER_SIZE   8
 143 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
 144         {
 145         BUF_MEM *b;
 146         unsigned char *p;
 147         int i;
 148         int ret=-1;
 149         ASN1_CTX c;
 150         int want=HEADER_SIZE;
 151         int eos=0;
 152 #if defined(__GNUC__) && defined(__ia64)
 153         /* pathetic compiler bug in all known versions as of Nov. 2002 */
 154         long off=0;
 155 #else
 156         int off=0;
 157 #endif
 158         int len=0;
 159
 160         b=BUF_MEM_new();
 161         if (b == NULL)
 162                 {
 163                 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
 164                 return -1;
 165                 }
 166
 167         ERR_clear_error();
 168         for (;;)
 169                 {
 170                 if (want >= (len-off))
 171                         {
 172                         want-=(len-off);
 173
 174                         if (!BUF_MEM_grow_clean(b,len+want))
 175                                 {
 176                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
 177                                 goto err;
 178                                 }
 179                         i=BIO_read(in,&(b->data[len]),want);
 180                         if ((i < 0) && ((len-off) == 0))
 181                                 {
 182                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ASN1_R_NOT_ENOUGH_DATA);
 183                                 goto err;
 184                                 }
 185                         if (i > 0)
 186                                 len+=i;
 187                         }
 188                 /* else data already loaded */
 189
 190                 p=(unsigned char *)&(b->data[off]);
 191                 c.p=p;
 192                 c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),
 193                         len-off);
 194                 if (c.inf & 0x80)
 195                         {
 196                         unsigned long e;
 197
 198                         e=ERR_GET_REASON(ERR_peek_error());
 199                         if (e != ASN1_R_TOO_LONG)
 200                                 goto err;
 201                         else
 202                                 ERR_get_error(); /* clear error */
 203                         }
 204                 i=c.p-p;/* header length */
 205                 off+=i; /* end of data */
 206
 207                 if (c.inf & 1)
 208                         {
 209                         /* no data body so go round again */
 210                         eos++;
 211                         want=HEADER_SIZE;
 212                         }
 213                 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
 214                         {
 215                         /* eos value, so go back and read another header */
 216                         eos--;
 217                         if (eos <= 0)
 218                                 break;
 219                         else
 220                                 want=HEADER_SIZE;
 221                         }
 222                 else
 223                         {
 224                         /* suck in c.slen bytes of data */
 225                         want=(int)c.slen;
 226                         if (want > (len-off))
 227                                 {
 228                                 want-=(len-off);
 229                                 if (!BUF_MEM_grow_clean(b,len+want))
 230                                         {
 231                                         ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
 232                                         goto err;
 233                                         }
 234                                 while (want > 0)
 235                                         {
 236                                         i=BIO_read(in,&(b->data[len]),want);
 237                                         if (i <= 0)
 238                                                 {
 239                                                 ASN1err(ASN1_F_ASN1_D2I_BIO,
 240                                                     ASN1_R_NOT_ENOUGH_DATA);
 241                                                 goto err;
 242                                                 }
 243                                         len+=i;
 244                                         want -= i;
 245                                         }
 246                                 }
 247                         off+=(int)c.slen;
 248                         if (eos <= 0)
 249                                 {
 250                                 break;
 251                                 }
 252                         else
 253                                 want=HEADER_SIZE;
 254                         }
 255                 }
 256
 257         *pb = b;
 258         return off;
 259 err:
 260         if (b != NULL) BUF_MEM_free(b);
 261         return(ret);
 262         }