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) != (blen + inl)) 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 } 312