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 72 static BIO_METHOD mem_method = { 73 BIO_TYPE_MEM, 74 "memory buffer", 75 mem_write, 76 mem_read, 77 mem_puts, 78 mem_gets, 79 mem_ctrl, 80 mem_new, 81 mem_free, 82 NULL, 83 }; 84 85 /* bio->num is used to hold the value to return on 'empty', if it is 86 * 0, should_retry is not set */ 87 88 BIO_METHOD 89 *BIO_s_mem(void) 90 { 91 return (&mem_method); 92 } 93 94 BIO 95 *BIO_new_mem_buf(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 b->data = buf; 110 b->length = sz; 111 b->max = sz; 112 ret->flags |= BIO_FLAGS_MEM_RDONLY; 113 /* Since this is static data retrying wont help */ 114 ret->num = 0; 115 return ret; 116 } 117 118 static int 119 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 133 mem_free(BIO *a) 134 { 135 if (a == NULL) 136 return (0); 137 if (a->shutdown) { 138 if ((a->init) && (a->ptr != NULL)) { 139 BUF_MEM *b; 140 b = (BUF_MEM *)a->ptr; 141 if (a->flags & BIO_FLAGS_MEM_RDONLY) 142 b->data = NULL; 143 BUF_MEM_free(b); 144 a->ptr = NULL; 145 } 146 } 147 return (1); 148 } 149 150 static int 151 mem_read(BIO *b, char *out, int outl) 152 { 153 int ret = -1; 154 BUF_MEM *bm; 155 156 bm = (BUF_MEM *)b->ptr; 157 BIO_clear_retry_flags(b); 158 ret = (outl >=0 && (size_t)outl > bm->length) ? (int)bm->length : outl; 159 if ((out != NULL) && (ret > 0)) { 160 memcpy(out, bm->data, ret); 161 bm->length -= ret; 162 if (b->flags & BIO_FLAGS_MEM_RDONLY) 163 bm->data += ret; 164 else { 165 memmove(&(bm->data[0]), &(bm->data[ret]), bm->length); 166 } 167 } else if (bm->length == 0) { 168 ret = b->num; 169 if (ret != 0) 170 BIO_set_retry_read(b); 171 } 172 return (ret); 173 } 174 175 static int 176 mem_write(BIO *b, const char *in, int inl) 177 { 178 int ret = -1; 179 int blen; 180 BUF_MEM *bm; 181 182 bm = (BUF_MEM *)b->ptr; 183 if (in == NULL) { 184 BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER); 185 goto end; 186 } 187 188 if (b->flags & BIO_FLAGS_MEM_RDONLY) { 189 BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO); 190 goto end; 191 } 192 193 BIO_clear_retry_flags(b); 194 blen = bm->length; 195 if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl)) 196 goto end; 197 memcpy(&(bm->data[blen]), in, inl); 198 ret = inl; 199 end: 200 return (ret); 201 } 202 203 static long 204 mem_ctrl(BIO *b, int cmd, long num, void *ptr) 205 { 206 long ret = 1; 207 char **pptr; 208 209 BUF_MEM *bm = (BUF_MEM *)b->ptr; 210 211 switch (cmd) { 212 case BIO_CTRL_RESET: 213 if (bm->data != NULL) { 214 /* For read only case reset to the start again */ 215 if (b->flags & BIO_FLAGS_MEM_RDONLY) { 216 bm->data -= bm->max - bm->length; 217 bm->length = bm->max; 218 } else { 219 memset(bm->data, 0, bm->max); 220 bm->length = 0; 221 } 222 } 223 break; 224 case BIO_CTRL_EOF: 225 ret = (long)(bm->length == 0); 226 break; 227 case BIO_C_SET_BUF_MEM_EOF_RETURN: 228 b->num = (int)num; 229 break; 230 case BIO_CTRL_INFO: 231 ret = (long)bm->length; 232 if (ptr != NULL) { 233 pptr = (char **)ptr; 234 *pptr = (char *)&(bm->data[0]); 235 } 236 break; 237 case BIO_C_SET_BUF_MEM: 238 mem_free(b); 239 b->shutdown = (int)num; 240 b->ptr = ptr; 241 break; 242 case BIO_C_GET_BUF_MEM_PTR: 243 if (ptr != NULL) { 244 pptr = (char **)ptr; 245 *pptr = (char *)bm; 246 } 247 break; 248 case BIO_CTRL_GET_CLOSE: 249 ret = (long)b->shutdown; 250 break; 251 case BIO_CTRL_SET_CLOSE: 252 b->shutdown = (int)num; 253 break; 254 255 case BIO_CTRL_WPENDING: 256 ret = 0L; 257 break; 258 case BIO_CTRL_PENDING: 259 ret = (long)bm->length; 260 break; 261 case BIO_CTRL_DUP: 262 case BIO_CTRL_FLUSH: 263 ret = 1; 264 break; 265 case BIO_CTRL_PUSH: 266 case BIO_CTRL_POP: 267 default: 268 ret = 0; 269 break; 270 } 271 return (ret); 272 } 273 274 static int 275 mem_gets(BIO *bp, char *buf, int size) 276 { 277 int i, j; 278 int ret = -1; 279 char *p; 280 BUF_MEM *bm = (BUF_MEM *)bp->ptr; 281 282 BIO_clear_retry_flags(bp); 283 j = bm->length; 284 if ((size - 1) < j) 285 j = size - 1; 286 if (j <= 0) { 287 *buf = '\0'; 288 return 0; 289 } 290 p = bm->data; 291 for (i = 0; i < j; i++) { 292 if (p[i] == '\n') { 293 i++; 294 break; 295 } 296 } 297 298 /* 299 * i is now the max num of bytes to copy, either j or up to 300 * and including the first newline 301 */ 302 303 i = mem_read(bp, buf, i); 304 if (i > 0) 305 buf[i] = '\0'; 306 ret = i; 307 return (ret); 308 } 309 310 static int 311 mem_puts(BIO *bp, const char *str) 312 { 313 int n, ret; 314 315 n = strlen(str); 316 ret = mem_write(bp, str, n); 317 /* memory semantics is that it will always work */ 318 return (ret); 319 } 320