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      1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      2  * All rights reserved.
      3  *
      4  * This package is an SSL implementation written
      5  * by Eric Young (eay (at) cryptsoft.com).
      6  * The implementation was written so as to conform with Netscapes SSL.
      7  *
      8  * This library is free for commercial and non-commercial use as long as
      9  * the following conditions are aheared to.  The following conditions
     10  * apply to all code found in this distribution, be it the RC4, RSA,
     11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     12  * included with this distribution is covered by the same copyright terms
     13  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     14  *
     15  * Copyright remains Eric Young's, and as such any Copyright notices in
     16  * the code are not to be removed.
     17  * If this package is used in a product, Eric Young should be given attribution
     18  * as the author of the parts of the library used.
     19  * This can be in the form of a textual message at program startup or
     20  * in documentation (online or textual) provided with the package.
     21  *
     22  * Redistribution and use in source and binary forms, with or without
     23  * modification, are permitted provided that the following conditions
     24  * are met:
     25  * 1. Redistributions of source code must retain the copyright
     26  *    notice, this list of conditions and the following disclaimer.
     27  * 2. Redistributions in binary form must reproduce the above copyright
     28  *    notice, this list of conditions and the following disclaimer in the
     29  *    documentation and/or other materials provided with the distribution.
     30  * 3. All advertising materials mentioning features or use of this software
     31  *    must display the following acknowledgement:
     32  *    "This product includes cryptographic software written by
     33  *     Eric Young (eay (at) cryptsoft.com)"
     34  *    The word 'cryptographic' can be left out if the rouines from the library
     35  *    being used are not cryptographic related :-).
     36  * 4. If you include any Windows specific code (or a derivative thereof) from
     37  *    the apps directory (application code) you must include an acknowledgement:
     38  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     39  *
     40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     50  * SUCH DAMAGE.
     51  *
     52  * The licence and distribution terms for any publically available version or
     53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     54  * copied and put under another distribution licence
     55  * [including the GNU Public Licence.] */
     56 
     57 #include <openssl/bio.h>
     58 
     59 #include <limits.h>
     60 #include <string.h>
     61 
     62 #include <openssl/buf.h>
     63 #include <openssl/err.h>
     64 #include <openssl/mem.h>
     65 
     66 
     67 BIO *BIO_new_mem_buf(void *buf, int len) {
     68   BIO *ret;
     69   BUF_MEM *b;
     70   const size_t size = len < 0 ? strlen((char *)buf) : (size_t)len;
     71 
     72   if (!buf && len != 0) {
     73     OPENSSL_PUT_ERROR(BIO, BIO_R_NULL_PARAMETER);
     74     return NULL;
     75   }
     76 
     77   ret = BIO_new(BIO_s_mem());
     78   if (ret == NULL) {
     79     return NULL;
     80   }
     81 
     82   b = (BUF_MEM *)ret->ptr;
     83   b->data = buf;
     84   b->length = size;
     85   b->max = size;
     86 
     87   ret->flags |= BIO_FLAGS_MEM_RDONLY;
     88 
     89   /* |num| is used to store the value that this BIO will return when it runs
     90    * out of data. If it's negative then the retry flags will also be set. Since
     91    * this is static data, retrying wont help */
     92   ret->num = 0;
     93 
     94   return ret;
     95 }
     96 
     97 static int mem_new(BIO *bio) {
     98   BUF_MEM *b;
     99 
    100   b = BUF_MEM_new();
    101   if (b == NULL) {
    102     return 0;
    103   }
    104 
    105   /* |shutdown| is used to store the close flag: whether the BIO has ownership
    106    * of the BUF_MEM. */
    107   bio->shutdown = 1;
    108   bio->init = 1;
    109   bio->num = -1;
    110   bio->ptr = (char *)b;
    111 
    112   return 1;
    113 }
    114 
    115 static int mem_free(BIO *bio) {
    116   BUF_MEM *b;
    117 
    118   if (bio == NULL) {
    119     return 0;
    120   }
    121 
    122   if (!bio->shutdown || !bio->init || bio->ptr == NULL) {
    123     return 1;
    124   }
    125 
    126   b = (BUF_MEM *)bio->ptr;
    127   if (bio->flags & BIO_FLAGS_MEM_RDONLY) {
    128     b->data = NULL;
    129   }
    130   BUF_MEM_free(b);
    131   bio->ptr = NULL;
    132   return 1;
    133 }
    134 
    135 static int mem_read(BIO *bio, char *out, int outl) {
    136   int ret;
    137   BUF_MEM *b = (BUF_MEM*) bio->ptr;
    138 
    139   BIO_clear_retry_flags(bio);
    140   ret = outl;
    141   if (b->length < INT_MAX && ret > (int)b->length) {
    142     ret = b->length;
    143   }
    144 
    145   if (ret > 0) {
    146     memcpy(out, b->data, ret);
    147     b->length -= ret;
    148     if (bio->flags & BIO_FLAGS_MEM_RDONLY) {
    149       b->data += ret;
    150     } else {
    151       memmove(b->data, &b->data[ret], b->length);
    152     }
    153   } else if (b->length == 0) {
    154     ret = bio->num;
    155     if (ret != 0) {
    156       BIO_set_retry_read(bio);
    157     }
    158   }
    159   return ret;
    160 }
    161 
    162 static int mem_write(BIO *bio, const char *in, int inl) {
    163   int ret = -1;
    164   int blen;
    165   BUF_MEM *b;
    166 
    167   b = (BUF_MEM *)bio->ptr;
    168 
    169   if (bio->flags & BIO_FLAGS_MEM_RDONLY) {
    170     OPENSSL_PUT_ERROR(BIO, BIO_R_WRITE_TO_READ_ONLY_BIO);
    171     goto err;
    172   }
    173 
    174   BIO_clear_retry_flags(bio);
    175   blen = b->length;
    176   if (INT_MAX - blen < inl) {
    177     goto err;
    178   }
    179   if (BUF_MEM_grow_clean(b, blen + inl) != ((size_t) blen) + inl) {
    180     goto err;
    181   }
    182   memcpy(&b->data[blen], in, inl);
    183   ret = inl;
    184 
    185 err:
    186   return ret;
    187 }
    188 
    189 static int mem_puts(BIO *bp, const char *str) {
    190   return mem_write(bp, str, strlen(str));
    191 }
    192 
    193 static int mem_gets(BIO *bio, char *buf, int size) {
    194   int i, j;
    195   char *p;
    196   BUF_MEM *b = (BUF_MEM *)bio->ptr;
    197 
    198   BIO_clear_retry_flags(bio);
    199   j = b->length;
    200   if (size - 1 < j) {
    201     j = size - 1;
    202   }
    203   if (j <= 0) {
    204     if (size > 0) {
    205       *buf = 0;
    206     }
    207     return 0;
    208   }
    209 
    210   p = b->data;
    211   for (i = 0; i < j; i++) {
    212     if (p[i] == '\n') {
    213       i++;
    214       break;
    215     }
    216   }
    217 
    218   /* i is now the max num of bytes to copy, either j or up to and including the
    219    * first newline */
    220 
    221   i = mem_read(bio, buf, i);
    222   if (i > 0) {
    223     buf[i] = '\0';
    224   }
    225   return i;
    226 }
    227 
    228 static long mem_ctrl(BIO *bio, int cmd, long num, void *ptr) {
    229   long ret = 1;
    230   char **pptr;
    231 
    232   BUF_MEM *b = (BUF_MEM *)bio->ptr;
    233 
    234   switch (cmd) {
    235     case BIO_CTRL_RESET:
    236       if (b->data != NULL) {
    237         /* For read only case reset to the start again */
    238         if (bio->flags & BIO_FLAGS_MEM_RDONLY) {
    239           b->data -= b->max - b->length;
    240           b->length = b->max;
    241         } else {
    242           memset(b->data, 0, b->max);
    243           b->length = 0;
    244         }
    245       }
    246       break;
    247     case BIO_CTRL_EOF:
    248       ret = (long)(b->length == 0);
    249       break;
    250     case BIO_C_SET_BUF_MEM_EOF_RETURN:
    251       bio->num = (int)num;
    252       break;
    253     case BIO_CTRL_INFO:
    254       ret = (long)b->length;
    255       if (ptr != NULL) {
    256         pptr = (char **)ptr;
    257         *pptr = (char *)&b->data[0];
    258       }
    259       break;
    260     case BIO_C_SET_BUF_MEM:
    261       mem_free(bio);
    262       bio->shutdown = (int)num;
    263       bio->ptr = ptr;
    264       break;
    265     case BIO_C_GET_BUF_MEM_PTR:
    266       if (ptr != NULL) {
    267         pptr = (char **)ptr;
    268         *pptr = (char *)b;
    269       }
    270       break;
    271     case BIO_CTRL_GET_CLOSE:
    272       ret = (long)bio->shutdown;
    273       break;
    274     case BIO_CTRL_SET_CLOSE:
    275       bio->shutdown = (int)num;
    276       break;
    277 
    278     case BIO_CTRL_WPENDING:
    279       ret = 0L;
    280       break;
    281     case BIO_CTRL_PENDING:
    282       ret = (long)b->length;
    283       break;
    284     case BIO_CTRL_FLUSH:
    285       ret = 1;
    286       break;
    287     default:
    288       ret = 0;
    289       break;
    290   }
    291   return ret;
    292 }
    293 
    294 static const BIO_METHOD mem_method = {
    295     BIO_TYPE_MEM, "memory buffer", mem_write, mem_read, mem_puts,
    296     mem_gets,     mem_ctrl,        mem_new,   mem_free, NULL, };
    297 
    298 const BIO_METHOD *BIO_s_mem(void) { return &mem_method; }
    299 
    300 int BIO_mem_contents(const BIO *bio, const uint8_t **out_contents,
    301                      size_t *out_len) {
    302   const BUF_MEM *b;
    303   if (bio->method != &mem_method) {
    304     return 0;
    305   }
    306 
    307   b = (BUF_MEM *)bio->ptr;
    308   *out_contents = (uint8_t *)b->data;
    309   *out_len = b->length;
    310   return 1;
    311 }
    312 
    313 long BIO_get_mem_data(BIO *bio, char **contents) {
    314   return BIO_ctrl(bio, BIO_CTRL_INFO, 0, (char *) contents);
    315 }
    316 
    317 int BIO_get_mem_ptr(BIO *bio, BUF_MEM **out) {
    318   return BIO_ctrl(bio, BIO_C_GET_BUF_MEM_PTR, 0, (char *) out);
    319 }
    320 
    321 int BIO_set_mem_buf(BIO *bio, BUF_MEM *b, int take_ownership) {
    322   return BIO_ctrl(bio, BIO_C_SET_BUF_MEM, take_ownership, (char *) b);
    323 }
    324 
    325 int BIO_set_mem_eof_return(BIO *bio, int eof_value) {
    326   return BIO_ctrl(bio, BIO_C_SET_BUF_MEM_EOF_RETURN, eof_value, NULL);
    327 }
    328