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 static int mem_write(BIO *h, const char *buf, int num);
  65 static int mem_read(BIO *h, char *buf, int size);
  66 static int mem_puts(BIO *h, const char *str);
  67 static int mem_gets(BIO *h, char *str, int size);
  68 static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  69 static int mem_new(BIO *h);
  70 static int mem_free(BIO *data);
  71 static BIO_METHOD mem_method = {
  72     BIO_TYPE_MEM,
  73     "memory buffer",
  74     mem_write,
  75     mem_read,
  76     mem_puts,
  77     mem_gets,
  78     mem_ctrl,
  79     mem_new,
  80     mem_free,
  81     NULL,
  82 };
  83
  84 /*
  85  * bio->num is used to hold the value to return on 'empty', if it is 0,
  86  * should_retry is not set
  87  */
  88
  89 BIO_METHOD *BIO_s_mem(void)
  90 {
  91     return (&mem_method);
  92 }
  93
  94 BIO *BIO_new_mem_buf(void *buf, int len)
  95 {
  96     BIO *ret;
  97     BUF_MEM *b;
  98     size_t sz;
  99
 100     if (!buf) {
 101         BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER);
 102         return NULL;
 103     }
 104     sz = (len < 0) ? strlen(buf) : (size_t)len;
 105     if (!(ret = BIO_new(BIO_s_mem())))
 106         return NULL;
 107     b = (BUF_MEM *)ret->ptr;
 108     b->data = buf;
 109     b->length = sz;
 110     b->max = sz;
 111     ret->flags |= BIO_FLAGS_MEM_RDONLY;
 112     /* Since this is static data retrying wont help */
 113     ret->num = 0;
 114     return ret;
 115 }
 116
 117 static int mem_new(BIO *bi)
 118 {
 119     BUF_MEM *b;
 120
 121     if ((b = BUF_MEM_new()) == NULL)
 122         return (0);
 123     bi->shutdown = 1;
 124     bi->init = 1;
 125     bi->num = -1;
 126     bi->ptr = (char *)b;
 127     return (1);
 128 }
 129
 130 static int mem_free(BIO *a)
 131 {
 132     if (a == NULL)
 133         return (0);
 134     if (a->shutdown) {
 135         if ((a->init) && (a->ptr != NULL)) {
 136             BUF_MEM *b;
 137             b = (BUF_MEM *)a->ptr;
 138             if (a->flags & BIO_FLAGS_MEM_RDONLY)
 139                 b->data = NULL;
 140             BUF_MEM_free(b);
 141             a->ptr = NULL;
 142         }
 143     }
 144     return (1);
 145 }
 146
 147 static int mem_read(BIO *b, char *out, int outl)
 148 {
 149     int ret = -1;
 150     BUF_MEM *bm;
 151
 152     bm = (BUF_MEM *)b->ptr;
 153     BIO_clear_retry_flags(b);
 154     ret = (outl >= 0 && (size_t)outl > bm->length) ? (int)bm->length : outl;
 155     if ((out != NULL) && (ret > 0)) {
 156         memcpy(out, bm->data, ret);
 157         bm->length -= ret;
 158         if (b->flags & BIO_FLAGS_MEM_RDONLY)
 159             bm->data += ret;
 160         else {
 161             memmove(&(bm->data[0]), &(bm->data[ret]), bm->length);
 162         }
 163     } else if (bm->length == 0) {
 164         ret = b->num;
 165         if (ret != 0)
 166             BIO_set_retry_read(b);
 167     }
 168     return (ret);
 169 }
 170
 171 static int mem_write(BIO *b, const char *in, int inl)
 172 {
 173     int ret = -1;
 174     int blen;
 175     BUF_MEM *bm;
 176
 177     bm = (BUF_MEM *)b->ptr;
 178     if (in == NULL) {
 179         BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER);
 180         goto end;
 181     }
 182
 183     if (b->flags & BIO_FLAGS_MEM_RDONLY) {
 184         BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO);
 185         goto end;
 186     }
 187
 188     BIO_clear_retry_flags(b);
 189     blen = bm->length;
 190     if (BUF_MEM_grow_clean(bm, blen + inl) == 0)
 191         goto end;
 192     memcpy(&(bm->data[blen]), in, inl);
 193     ret = inl;
 194  end:
 195     return (ret);
 196 }
 197
 198 static long mem_ctrl(BIO *b, int cmd, long num, void *ptr)
 199 {
 200     long ret = 1;
 201     char **pptr;
 202
 203     BUF_MEM *bm = (BUF_MEM *)b->ptr;
 204
 205     switch (cmd) {
 206     case BIO_CTRL_RESET:
 207         if (bm->data != NULL) {
 208             /* For read only case reset to the start again */
 209             if (b->flags & BIO_FLAGS_MEM_RDONLY) {
 210                 bm->data -= bm->max - bm->length;
 211                 bm->length = bm->max;
 212             } else {
 213                 memset(bm->data, 0, bm->max);
 214                 bm->length = 0;
 215             }
 216         }
 217         break;
 218     case BIO_CTRL_EOF:
 219         ret = (long)(bm->length == 0);
 220         break;
 221     case BIO_C_SET_BUF_MEM_EOF_RETURN:
 222         b->num = (int)num;
 223         break;
 224     case BIO_CTRL_INFO:
 225         ret = (long)bm->length;
 226         if (ptr != NULL) {
 227             pptr = (char **)ptr;
 228             *pptr = (char *)&(bm->data[0]);
 229         }
 230         break;
 231     case BIO_C_SET_BUF_MEM:
 232         mem_free(b);
 233         b->shutdown = (int)num;
 234         b->ptr = ptr;
 235         break;
 236     case BIO_C_GET_BUF_MEM_PTR:
 237         if (ptr != NULL) {
 238             pptr = (char **)ptr;
 239             *pptr = (char *)bm;
 240         }
 241         break;
 242     case BIO_CTRL_GET_CLOSE:
 243         ret = (long)b->shutdown;
 244         break;
 245     case BIO_CTRL_SET_CLOSE:
 246         b->shutdown = (int)num;
 247         break;
 248
 249     case BIO_CTRL_WPENDING:
 250         ret = 0L;
 251         break;
 252     case BIO_CTRL_PENDING:
 253         ret = (long)bm->length;
 254         break;
 255     case BIO_CTRL_DUP:
 256     case BIO_CTRL_FLUSH:
 257         ret = 1;
 258         break;
 259     case BIO_CTRL_PUSH:
 260     case BIO_CTRL_POP:
 261     default:
 262         ret = 0;
 263         break;
 264     }
 265     return (ret);
 266 }
 267
 268 static int mem_gets(BIO *bp, char *buf, int size)
 269 {
 270     int i, j;
 271     int ret = -1;
 272     char *p;
 273     BUF_MEM *bm = (BUF_MEM *)bp->ptr;
 274
 275     BIO_clear_retry_flags(bp);
 276     j = bm->length;
 277     if ((size - 1) < j)
 278         j = size - 1;
 279     if (j <= 0) {
 280         *buf = '\0';
 281         return 0;
 282     }
 283     p = bm->data;
 284     for (i = 0; i < j; i++) {
 285         if (p[i] == '\n') {
 286             i++;
 287             break;
 288         }
 289     }
 290
 291     /*
 292      * i is now the max num of bytes to copy, either j or up to
 293      * and including the first newline
 294      */
 295
 296     i = mem_read(bp, buf, i);
 297     if (i > 0)
 298         buf[i] = '\0';
 299     ret = i;
 300     return (ret);
 301 }
 302
 303 static int mem_puts(BIO *bp, const char *str)
 304 {
 305     int n, ret;
 306
 307     n = strlen(str);
 308     ret = mem_write(bp, str, n);
 309     /* memory semantics is that it will always work */
 310     return (ret);
 311 }