crypto/bio/bss_mem.c

   1 /* crypto/bio/bss_mem.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 <errno.h>
  61 #include "cryptlib.h"
  62 #include <openssl/bio.h>
  63
  64 #ifndef NOPROTO
  65 static int mem_write(BIO *h,char *buf,int num);
  66 static int mem_read(BIO *h,char *buf,int size);
  67 static int mem_puts(BIO *h,char *str);
  68 static int mem_gets(BIO *h,char *str,int size);
  69 static long mem_ctrl(BIO *h,int cmd,long arg1,char *arg2);
  70 static int mem_new(BIO *h);
  71 static int mem_free(BIO *data);
  72 #else
  73 static int mem_write();
  74 static int mem_read();
  75 static int mem_puts();
  76 static int mem_gets();
  77 static long mem_ctrl();
  78 static int mem_new();
  79 static int mem_free();
  80 #endif
  81
  82 static BIO_METHOD mem_method=
  83         {
  84         BIO_TYPE_MEM,
  85         "memory buffer",
  86         mem_write,
  87         mem_read,
  88         mem_puts,
  89         mem_gets,
  90         mem_ctrl,
  91         mem_new,
  92         mem_free,
  93         };
  94
  95 /* bio->num is used to hold the value to return on 'empty', if it is
  96  * 0, should_retry is not set */
  97
  98 BIO_METHOD *BIO_s_mem(void)
  99         {
 100         return(&mem_method);
 101         }
 102
 103 static int mem_new(BIO *bi)
 104         {
 105         BUF_MEM *b;
 106
 107         if ((b=BUF_MEM_new()) == NULL)
 108                 return(0);
 109         bi->shutdown=1;
 110         bi->init=1;
 111         bi->num= -1;
 112         bi->ptr=(char *)b;
 113         return(1);
 114         }
 115
 116 static int mem_free(BIO *a)
 117         {
 118         if (a == NULL) return(0);
 119         if (a->shutdown)
 120                 {
 121                 if ((a->init) && (a->ptr != NULL))
 122                         {
 123                         BUF_MEM_free((BUF_MEM *)a->ptr);
 124                         a->ptr=NULL;
 125                         }
 126                 }
 127         return(1);
 128         }
 129
 130 static int mem_read(BIO *b, char *out, int outl)
 131         {
 132         int ret= -1;
 133         BUF_MEM *bm;
 134         int i;
 135         char *from,*to;
 136
 137         bm=(BUF_MEM *)b->ptr;
 138         BIO_clear_retry_flags(b);
 139         ret=(outl > bm->length)?bm->length:outl;
 140         if ((out != NULL) && (ret > 0))
 141                 {
 142                 memcpy(out,bm->data,ret);
 143                 bm->length-=ret;
 144                 /* memmove(&(bm->data[0]),&(bm->data[ret]), bm->length); */
 145                 from=(char *)&(bm->data[ret]);
 146                 to=(char *)&(bm->data[0]);
 147                 for (i=0; i<bm->length; i++)
 148                         to[i]=from[i];
 149                 }
 150         else if (bm->length == 0)
 151                 {
 152                 if (b->num != 0)
 153                         BIO_set_retry_read(b);
 154                 ret= b->num;
 155                 }
 156         return(ret);
 157         }
 158
 159 static int mem_write(BIO *b, char *in, int inl)
 160         {
 161         int ret= -1;
 162         int blen;
 163         BUF_MEM *bm;
 164
 165         bm=(BUF_MEM *)b->ptr;
 166         if (in == NULL)
 167                 {
 168                 BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER);
 169                 goto end;
 170                 }
 171
 172         BIO_clear_retry_flags(b);
 173         blen=bm->length;
 174         if (BUF_MEM_grow(bm,blen+inl) != (blen+inl))
 175                 goto end;
 176         memcpy(&(bm->data[blen]),in,inl);
 177         ret=inl;
 178 end:
 179         return(ret);
 180         }
 181
 182 static long mem_ctrl(BIO *b, int cmd, long num, char *ptr)
 183         {
 184         long ret=1;
 185         char **pptr;
 186
 187         BUF_MEM *bm=(BUF_MEM *)b->ptr;
 188
 189         switch (cmd)
 190                 {
 191         case BIO_CTRL_RESET:
 192                 if (bm->data != NULL)
 193                         memset(bm->data,0,bm->max);
 194                 bm->length=0;
 195                 break;
 196         case BIO_CTRL_EOF:
 197                 ret=(long)(bm->length == 0);
 198                 break;
 199         case BIO_C_SET_BUF_MEM_EOF_RETURN:
 200                 b->num=(int)num;
 201                 break;
 202         case BIO_CTRL_INFO:
 203                 ret=(long)bm->length;
 204                 if (ptr != NULL)
 205                         {
 206                         pptr=(char **)ptr;
 207                         *pptr=(char *)&(bm->data[0]);
 208                         }
 209                 break;
 210         case BIO_C_SET_BUF_MEM:
 211                 mem_free(b);
 212                 b->shutdown=(int)num;
 213                 b->ptr=ptr;
 214                 break;
 215         case BIO_C_GET_BUF_MEM_PTR:
 216                 if (ptr != NULL)
 217                         {
 218                         pptr=(char **)ptr;
 219                         *pptr=(char *)bm;
 220                         }
 221                 break;
 222         case BIO_CTRL_GET_CLOSE:
 223                 ret=(long)b->shutdown;
 224                 break;
 225         case BIO_CTRL_SET_CLOSE:
 226                 b->shutdown=(int)num;
 227                 break;
 228
 229         case BIO_CTRL_WPENDING:
 230                 ret=0L;
 231                 break;
 232         case BIO_CTRL_PENDING:
 233                 ret=(long)bm->length;
 234                 break;
 235         case BIO_CTRL_DUP:
 236         case BIO_CTRL_FLUSH:
 237                 ret=1;
 238                 break;
 239         case BIO_CTRL_PUSH:
 240         case BIO_CTRL_POP:
 241         default:
 242                 ret=0;
 243                 break;
 244                 }
 245         return(ret);
 246         }
 247
 248 static int mem_gets(BIO *bp, char *buf, int size)
 249         {
 250         int i,j;
 251         int ret= -1;
 252         char *p;
 253         BUF_MEM *bm=(BUF_MEM *)bp->ptr;
 254
 255         BIO_clear_retry_flags(bp);
 256         j=bm->length;
 257         if (j <= 0) return(0);
 258         p=bm->data;
 259         for (i=0; i<j; i++)
 260                 {
 261                 if (p[i] == '\n') break;
 262                 }
 263         if (i == j)
 264                 {
 265                 BIO_set_retry_read(bp);
 266                 /* return(-1);  change the semantics 0.6.6a */
 267                 }
 268         else
 269                 i++;
 270         /* i is the max to copy */
 271         if ((size-1) < i) i=size-1;
 272         i=mem_read(bp,buf,i);
 273         if (i > 0) buf[i]='\0';
 274         ret=i;
 275         return(ret);
 276         }
 277
 278 static int mem_puts(BIO *bp, char *str)
 279         {
 280         int n,ret;
 281
 282         n=strlen(str);
 283         ret=mem_write(bp,str,n);
 284         /* memory semantics is that it will always work */
 285         return(ret);
 286         }
 287