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
