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 95 BIO *BIO_new_mem_buf(const void *buf, int len) 96 { 97 BIO *ret; 98 BUF_MEM *b; 99 size_t sz; 100 101 if (!buf) { 102 BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER); 103 return NULL; 104 } 105 sz = (len < 0) ? strlen(buf) : (size_t)len; 106 if (!(ret = BIO_new(BIO_s_mem()))) 107 return NULL; 108 b = (BUF_MEM *)ret->ptr; 109 /* Cast away const and trust in the MEM_RDONLY flag. */ 110 b->data = (void *)buf; 111 b->length = sz; 112 b->max = sz; 113 ret->flags |= BIO_FLAGS_MEM_RDONLY; 114 /* Since this is static data retrying wont help */ 115 ret->num = 0; 116 return ret; 117 } 118 119 static int mem_new(BIO *bi) 120 { 121 BUF_MEM *b; 122 123 if ((b = BUF_MEM_new()) == NULL) 124 return (0); 125 bi->shutdown = 1; 126 bi->init = 1; 127 bi->num = -1; 128 bi->ptr = (char *)b; 129 return (1); 130 } 131 132 static int mem_free(BIO *a) 133 { 134 if (a == NULL) 135 return (0); 136 if (a->shutdown) { 137 if ((a->init) && (a->ptr != NULL)) { 138 BUF_MEM *b; 139 b = (BUF_MEM *)a->ptr; 140 if (a->flags & BIO_FLAGS_MEM_RDONLY) 141 b->data = NULL; 142 BUF_MEM_free(b); 143 a->ptr = NULL; 144 } 145 } 146 return (1); 147 } 148 149 static int mem_read(BIO *b, char *out, int outl) 150 { 151 int ret = -1; 152 BUF_MEM *bm; 153 154 bm = (BUF_MEM *)b->ptr; 155 BIO_clear_retry_flags(b); 156 ret = (outl >= 0 && (size_t)outl > bm->length) ? (int)bm->length : outl; 157 if ((out != NULL) && (ret > 0)) { 158 memcpy(out, bm->data, ret); 159 bm->length -= ret; 160 if (b->flags & BIO_FLAGS_MEM_RDONLY) 161 bm->data += ret; 162 else { 163 memmove(&(bm->data[0]), &(bm->data[ret]), bm->length); 164 } 165 } else if (bm->length == 0) { 166 ret = b->num; 167 if (ret != 0) 168 BIO_set_retry_read(b); 169 } 170 return (ret); 171 } 172 173 static int mem_write(BIO *b, const char *in, int inl) 174 { 175 int ret = -1; 176 int blen; 177 BUF_MEM *bm; 178 179 bm = (BUF_MEM *)b->ptr; 180 if (in == NULL) { 181 BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER); 182 goto end; 183 } 184 185 if (b->flags & BIO_FLAGS_MEM_RDONLY) { 186 BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO); 187 goto end; 188 } 189 190 BIO_clear_retry_flags(b); 191 if (inl == 0) 192 return 0; 193 blen = bm->length; 194 if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl)) 195 goto end; 196 memcpy(&(bm->data[blen]), in, inl); 197 ret = inl; 198 end: 199 return (ret); 200 } 201 202 static long mem_ctrl(BIO *b, int cmd, long num, void *ptr) 203 { 204 long ret = 1; 205 char **pptr; 206 207 BUF_MEM *bm = (BUF_MEM *)b->ptr; 208 209 switch (cmd) { 210 case BIO_CTRL_RESET: 211 if (bm->data != NULL) { 212 /* For read only case reset to the start again */ 213 if (b->flags & BIO_FLAGS_MEM_RDONLY) { 214 bm->data -= bm->max - bm->length; 215 bm->length = bm->max; 216 } else { 217 memset(bm->data, 0, bm->max); 218 bm->length = 0; 219 } 220 } 221 break; 222 case BIO_CTRL_EOF: 223 ret = (long)(bm->length == 0); 224 break; 225 case BIO_C_SET_BUF_MEM_EOF_RETURN: 226 b->num = (int)num; 227 break; 228 case BIO_CTRL_INFO: 229 ret = (long)bm->length; 230 if (ptr != NULL) { 231 pptr = (char **)ptr; 232 *pptr = (char *)&(bm->data[0]); 233 } 234 break; 235 case BIO_C_SET_BUF_MEM: 236 mem_free(b); 237 b->shutdown = (int)num; 238 b->ptr = ptr; 239 break; 240 case BIO_C_GET_BUF_MEM_PTR: 241 if (ptr != NULL) { 242 pptr = (char **)ptr; 243 *pptr = (char *)bm; 244 } 245 break; 246 case BIO_CTRL_GET_CLOSE: 247 ret = (long)b->shutdown; 248 break; 249 case BIO_CTRL_SET_CLOSE: 250 b->shutdown = (int)num; 251 break; 252 253 case BIO_CTRL_WPENDING: 254 ret = 0L; 255 break; 256 case BIO_CTRL_PENDING: 257 ret = (long)bm->length; 258 break; 259 case BIO_CTRL_DUP: 260 case BIO_CTRL_FLUSH: 261 ret = 1; 262 break; 263 case BIO_CTRL_PUSH: 264 case BIO_CTRL_POP: 265 default: 266 ret = 0; 267 break; 268 } 269 return (ret); 270 } 271 272 static int mem_gets(BIO *bp, char *buf, int size) 273 { 274 int i, j; 275 int ret = -1; 276 char *p; 277 BUF_MEM *bm = (BUF_MEM *)bp->ptr; 278 279 BIO_clear_retry_flags(bp); 280 j = bm->length; 281 if ((size - 1) < j) 282 j = size - 1; 283 if (j <= 0) { 284 *buf = '\0'; 285 return 0; 286 } 287 p = bm->data; 288 for (i = 0; i < j; i++) { 289 if (p[i] == '\n') { 290 i++; 291 break; 292 } 293 } 294 295 /* 296 * i is now the max num of bytes to copy, either j or up to 297 * and including the first newline 298 */ 299 300 i = mem_read(bp, buf, i); 301 if (i > 0) 302 buf[i] = '\0'; 303 ret = i; 304 return (ret); 305 } 306 307 static int mem_puts(BIO *bp, const char *str) 308 { 309 int n, ret; 310 311 n = strlen(str); 312 ret = mem_write(bp, str, n); 313 /* memory semantics is that it will always work */ 314 return (ret); 315 } 316