1 /* $OpenBSD: bss_mem.c,v 1.12 2014/07/10 13:58:22 jsing Exp $ */ 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 <errno.h> 60 #include <stdio.h> 61 #include <string.h> 62 63 #include "cryptlib.h" 64 #include <openssl/bio.h> 65 66 static int mem_write(BIO *h, const char *buf, int num); 67 static int mem_read(BIO *h, char *buf, int size); 68 static int mem_puts(BIO *h, const char *str); 69 static int mem_gets(BIO *h, char *str, int size); 70 static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2); 71 static int mem_new(BIO *h); 72 static int mem_free(BIO *data); 73 74 static BIO_METHOD mem_method = { 75 .type = BIO_TYPE_MEM, 76 .name = "memory buffer", 77 .bwrite = mem_write, 78 .bread = mem_read, 79 .bputs = mem_puts, 80 .bgets = mem_gets, 81 .ctrl = mem_ctrl, 82 .create = mem_new, 83 .destroy = mem_free 84 }; 85 86 /* bio->num is used to hold the value to return on 'empty', if it is 87 * 0, should_retry is not set */ 88 89 BIO_METHOD * 90 BIO_s_mem(void) 91 { 92 return (&mem_method); 93 } 94 95 BIO * 96 BIO_new_mem_buf(void *buf, int len) 97 { 98 BIO *ret; 99 BUF_MEM *b; 100 size_t sz; 101 102 if (!buf) { 103 BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER); 104 return NULL; 105 } 106 sz = (len < 0) ? strlen(buf) : (size_t)len; 107 if (!(ret = BIO_new(BIO_s_mem()))) 108 return NULL; 109 b = (BUF_MEM *)ret->ptr; 110 b->data = 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 120 mem_new(BIO *bi) 121 { 122 BUF_MEM *b; 123 124 if ((b = BUF_MEM_new()) == NULL) 125 return (0); 126 bi->shutdown = 1; 127 bi->init = 1; 128 bi->num = -1; 129 bi->ptr = (char *)b; 130 return (1); 131 } 132 133 static int 134 mem_free(BIO *a) 135 { 136 if (a == NULL) 137 return (0); 138 if (a->shutdown) { 139 if ((a->init) && (a->ptr != NULL)) { 140 BUF_MEM *b; 141 b = (BUF_MEM *)a->ptr; 142 if (a->flags & BIO_FLAGS_MEM_RDONLY) 143 b->data = NULL; 144 BUF_MEM_free(b); 145 a->ptr = NULL; 146 } 147 } 148 return (1); 149 } 150 151 static int 152 mem_read(BIO *b, char *out, int outl) 153 { 154 int ret = -1; 155 BUF_MEM *bm; 156 157 bm = (BUF_MEM *)b->ptr; 158 BIO_clear_retry_flags(b); 159 ret = (outl >=0 && (size_t)outl > bm->length) ? (int)bm->length : outl; 160 if ((out != NULL) && (ret > 0)) { 161 memcpy(out, bm->data, ret); 162 bm->length -= ret; 163 if (b->flags & BIO_FLAGS_MEM_RDONLY) 164 bm->data += ret; 165 else { 166 memmove(&(bm->data[0]), &(bm->data[ret]), bm->length); 167 } 168 } else if (bm->length == 0) { 169 ret = b->num; 170 if (ret != 0) 171 BIO_set_retry_read(b); 172 } 173 return (ret); 174 } 175 176 static int 177 mem_write(BIO *b, const char *in, int inl) 178 { 179 int ret = -1; 180 int blen; 181 BUF_MEM *bm; 182 183 bm = (BUF_MEM *)b->ptr; 184 if (in == NULL) { 185 BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER); 186 goto end; 187 } 188 189 if (b->flags & BIO_FLAGS_MEM_RDONLY) { 190 BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO); 191 goto end; 192 } 193 194 BIO_clear_retry_flags(b); 195 blen = bm->length; 196 if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl)) 197 goto end; 198 memcpy(&(bm->data[blen]), in, inl); 199 ret = inl; 200 end: 201 return (ret); 202 } 203 204 static long 205 mem_ctrl(BIO *b, int cmd, long num, void *ptr) 206 { 207 long ret = 1; 208 char **pptr; 209 210 BUF_MEM *bm = (BUF_MEM *)b->ptr; 211 212 switch (cmd) { 213 case BIO_CTRL_RESET: 214 if (bm->data != NULL) { 215 /* For read only case reset to the start again */ 216 if (b->flags & BIO_FLAGS_MEM_RDONLY) { 217 bm->data -= bm->max - bm->length; 218 bm->length = bm->max; 219 } else { 220 memset(bm->data, 0, bm->max); 221 bm->length = 0; 222 } 223 } 224 break; 225 case BIO_CTRL_EOF: 226 ret = (long)(bm->length == 0); 227 break; 228 case BIO_C_SET_BUF_MEM_EOF_RETURN: 229 b->num = (int)num; 230 break; 231 case BIO_CTRL_INFO: 232 ret = (long)bm->length; 233 if (ptr != NULL) { 234 pptr = (char **)ptr; 235 *pptr = (char *)&(bm->data[0]); 236 } 237 break; 238 case BIO_C_SET_BUF_MEM: 239 mem_free(b); 240 b->shutdown = (int)num; 241 b->ptr = ptr; 242 break; 243 case BIO_C_GET_BUF_MEM_PTR: 244 if (ptr != NULL) { 245 pptr = (char **)ptr; 246 *pptr = (char *)bm; 247 } 248 break; 249 case BIO_CTRL_GET_CLOSE: 250 ret = (long)b->shutdown; 251 break; 252 case BIO_CTRL_SET_CLOSE: 253 b->shutdown = (int)num; 254 break; 255 256 case BIO_CTRL_WPENDING: 257 ret = 0L; 258 break; 259 case BIO_CTRL_PENDING: 260 ret = (long)bm->length; 261 break; 262 case BIO_CTRL_DUP: 263 case BIO_CTRL_FLUSH: 264 ret = 1; 265 break; 266 case BIO_CTRL_PUSH: 267 case BIO_CTRL_POP: 268 default: 269 ret = 0; 270 break; 271 } 272 return (ret); 273 } 274 275 static int 276 mem_gets(BIO *bp, char *buf, int size) 277 { 278 int i, j; 279 int ret = -1; 280 char *p; 281 BUF_MEM *bm = (BUF_MEM *)bp->ptr; 282 283 BIO_clear_retry_flags(bp); 284 j = bm->length; 285 if ((size - 1) < j) 286 j = size - 1; 287 if (j <= 0) { 288 *buf = '\0'; 289 return 0; 290 } 291 p = bm->data; 292 for (i = 0; i < j; i++) { 293 if (p[i] == '\n') { 294 i++; 295 break; 296 } 297 } 298 299 /* 300 * i is now the max num of bytes to copy, either j or up to 301 * and including the first newline 302 */ 303 304 i = mem_read(bp, buf, i); 305 if (i > 0) 306 buf[i] = '\0'; 307 ret = i; 308 return (ret); 309 } 310 311 static int 312 mem_puts(BIO *bp, const char *str) 313 { 314 int n, ret; 315 316 n = strlen(str); 317 ret = mem_write(bp, str, n); 318 /* memory semantics is that it will always work */ 319 return (ret); 320 } 321