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 "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_METHOD *BIO_s_mem()
  96         {
  97         return(&mem_method);
  98         }
  99
 100 static int mem_new(bi)
 101 BIO *bi;
 102         {
 103         BUF_MEM *b;
 104
 105         if ((b=BUF_MEM_new()) == NULL)
 106                 return(0);
 107         bi->shutdown=1;
 108         bi->init=1;
 109         bi->num=0;
 110         bi->ptr=(char *)b;
 111         return(1);
 112         }
 113
 114 static int mem_free(a)
 115 BIO *a;
 116         {
 117         if (a == NULL) return(0);
 118         if (a->shutdown)
 119                 {
 120                 if ((a->init) && (a->ptr != NULL))
 121                         {
 122                         BUF_MEM_free((BUF_MEM *)a->ptr);
 123                         a->ptr=NULL;
 124                         }
 125                 }
 126         return(1);
 127         }
 128
 129 static int mem_read(b,out,outl)
 130 BIO *b;
 131 char *out;
 132 int outl;
 133         {
 134         int ret= -1;
 135         BUF_MEM *bm;
 136         int i;
 137         char *from,*to;
 138
 139         bm=(BUF_MEM *)b->ptr;
 140         BIO_clear_retry_flags(b);
 141         ret=(outl > bm->length)?bm->length:outl;
 142         if ((out != NULL) && (ret > 0))
 143                 {
 144                 memcpy(out,bm->data,ret);
 145                 bm->length-=ret;
 146                 /* memmove(&(bm->data[0]),&(bm->data[ret]), bm->length); */
 147                 from=(char *)&(bm->data[ret]);
 148                 to=(char *)&(bm->data[0]);
 149                 for (i=0; i<bm->length; i++)
 150                         to[i]=from[i];
 151                 }
 152         else if (bm->length == 0)
 153                 {
 154                 BIO_set_retry_read(b);
 155                 ret= -1;
 156                 }
 157         return(ret);
 158         }
 159
 160 static int mem_write(b,in,inl)
 161 BIO *b;
 162 char *in;
 163 int inl;
 164         {
 165         int ret= -1;
 166         int blen;
 167         BUF_MEM *bm;
 168
 169         bm=(BUF_MEM *)b->ptr;
 170         if (in == NULL)
 171                 {
 172                 BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER);
 173                 goto end;
 174                 }
 175
 176         BIO_clear_retry_flags(b);
 177         blen=bm->length;
 178         if (BUF_MEM_grow(bm,blen+inl) != (blen+inl))
 179                 goto end;
 180         memcpy(&(bm->data[blen]),in,inl);
 181         ret=inl;
 182 end:
 183         return(ret);
 184         }
 185
 186 static long mem_ctrl(b,cmd,num,ptr)
 187 BIO *b;
 188 int cmd;
 189 long num;
 190 char *ptr;
 191         {
 192         long ret=1;
 193         char **pptr;
 194
 195         BUF_MEM *bm=(BUF_MEM *)b->ptr;
 196
 197         switch (cmd)
 198                 {
 199         case BIO_CTRL_RESET:
 200                 if (bm->data != NULL)
 201                         memset(bm->data,0,bm->max);
 202                 bm->length=0;
 203                 break;
 204         case BIO_CTRL_EOF:
 205                 ret=(long)(bm->length == 0);
 206                 break;
 207         case BIO_CTRL_INFO:
 208                 ret=(long)bm->length;
 209                 if (ptr != NULL)
 210                         {
 211                         pptr=(char **)ptr;
 212                         *pptr=(char *)&(bm->data[0]);
 213                         }
 214                 break;
 215         case BIO_C_SET_BUF_MEM:
 216                 mem_free(b);
 217                 b->shutdown=(int)num;
 218                 b->ptr=ptr;
 219                 break;
 220         case BIO_C_GET_BUF_MEM_PTR:
 221                 if (ptr != NULL)
 222                         {
 223                         pptr=(char **)ptr;
 224                         *pptr=(char *)bm;
 225                         }
 226                 break;
 227         case BIO_CTRL_GET_CLOSE:
 228                 ret=(long)b->shutdown;
 229                 break;
 230         case BIO_CTRL_SET_CLOSE:
 231                 b->shutdown=(int)num;
 232                 break;
 233
 234         case BIO_CTRL_WPENDING:
 235                 ret=0L;
 236                 break;
 237         case BIO_CTRL_PENDING:
 238                 ret=(long)bm->length;
 239                 break;
 240         case BIO_CTRL_DUP:
 241         case BIO_CTRL_FLUSH:
 242                 ret=1;
 243                 break;
 244         case BIO_CTRL_PUSH:
 245         case BIO_CTRL_POP:
 246         default:
 247                 ret=0;
 248                 break;
 249                 }
 250         return(ret);
 251         }
 252
 253 static int mem_gets(bp,buf,size)
 254 BIO *bp;
 255 char *buf;
 256 int size;
 257         {
 258         int i,j;
 259         int ret= -1;
 260         char *p;
 261         BUF_MEM *bm=(BUF_MEM *)bp->ptr;
 262
 263         BIO_clear_retry_flags(bp);
 264         j=bm->length;
 265         if (j <= 0) return(0);
 266         p=bm->data;
 267         for (i=0; i<j; i++)
 268                 {
 269                 if (p[i] == '\n') break;
 270                 }
 271         if (i == j)
 272                 {
 273                 BIO_set_retry_read(bp);
 274                 /* return(-1);  change the semantics 0.6.6a */
 275                 }
 276         else
 277                 i++;
 278         /* i is the max to copy */
 279         if ((size-1) < i) i=size-1;
 280         i=mem_read(bp,buf,i);
 281         if (i > 0) buf[i]='\0';
 282         ret=i;
 283         return(ret);
 284         }
 285
 286 static int mem_puts(bp,str)
 287 BIO *bp;
 288 char *str;
 289         {
 290         int n,ret;
 291
 292         n=strlen(str);
 293         ret=mem_write(bp,str,n);
 294         /* memory semantics is that it will always work */
 295         return(ret);
 296         }
 297