1 /* $OpenBSD: bss_mem.c,v 1.11 2014/06/12 15:49:28 deraadt 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 <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 .type = BIO_TYPE_MEM, 74 .name = "memory buffer", 75 .bwrite = mem_write, 76 .bread = mem_read, 77 .bputs = mem_puts, 78 .bgets = mem_gets, 79 .ctrl = mem_ctrl, 80 .create = mem_new, 81 .destroy = mem_free 82 }; 83 84 /* bio->num is used to hold the value to return on 'empty', if it is 85 * 0, should_retry is not set */ 86 87 BIO_METHOD * 88 BIO_s_mem(void) 89 { 90 return (&mem_method); 91 } 92 93 BIO * 94 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 118 mem_new(BIO *bi) 119 { 120 BUF_MEM *b; 121 122 if ((b = BUF_MEM_new()) == NULL) 123 return (0); 124 bi->shutdown = 1; 125 bi->init = 1; 126 bi->num = -1; 127 bi->ptr = (char *)b; 128 return (1); 129 } 130 131 static int 132 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 150 mem_read(BIO *b, char *out, int outl) 151 { 152 int ret = -1; 153 BUF_MEM *bm; 154 155 bm = (BUF_MEM *)b->ptr; 156 BIO_clear_retry_flags(b); 157 ret = (outl >=0 && (size_t)outl > bm->length) ? (int)bm->length : outl; 158 if ((out != NULL) && (ret > 0)) { 159 memcpy(out, bm->data, ret); 160 bm->length -= ret; 161 if (b->flags & BIO_FLAGS_MEM_RDONLY) 162 bm->data += ret; 163 else { 164 memmove(&(bm->data[0]), &(bm->data[ret]), bm->length); 165 } 166 } else if (bm->length == 0) { 167 ret = b->num; 168 if (ret != 0) 169 BIO_set_retry_read(b); 170 } 171 return (ret); 172 } 173 174 static int 175 mem_write(BIO *b, const char *in, int inl) 176 { 177 int ret = -1; 178 int blen; 179 BUF_MEM *bm; 180 181 bm = (BUF_MEM *)b->ptr; 182 if (in == NULL) { 183 BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER); 184 goto end; 185 } 186 187 if (b->flags & BIO_FLAGS_MEM_RDONLY) { 188 BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO); 189 goto end; 190 } 191 192 BIO_clear_retry_flags(b); 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 203 mem_ctrl(BIO *b, int cmd, long num, void *ptr) 204 { 205 long ret = 1; 206 char **pptr; 207 208 BUF_MEM *bm = (BUF_MEM *)b->ptr; 209 210 switch (cmd) { 211 case BIO_CTRL_RESET: 212 if (bm->data != NULL) { 213 /* For read only case reset to the start again */ 214 if (b->flags & BIO_FLAGS_MEM_RDONLY) { 215 bm->data -= bm->max - bm->length; 216 bm->length = bm->max; 217 } else { 218 memset(bm->data, 0, bm->max); 219 bm->length = 0; 220 } 221 } 222 break; 223 case BIO_CTRL_EOF: 224 ret = (long)(bm->length == 0); 225 break; 226 case BIO_C_SET_BUF_MEM_EOF_RETURN: 227 b->num = (int)num; 228 break; 229 case BIO_CTRL_INFO: 230 ret = (long)bm->length; 231 if (ptr != NULL) { 232 pptr = (char **)ptr; 233 *pptr = (char *)&(bm->data[0]); 234 } 235 break; 236 case BIO_C_SET_BUF_MEM: 237 mem_free(b); 238 b->shutdown = (int)num; 239 b->ptr = ptr; 240 break; 241 case BIO_C_GET_BUF_MEM_PTR: 242 if (ptr != NULL) { 243 pptr = (char **)ptr; 244 *pptr = (char *)bm; 245 } 246 break; 247 case BIO_CTRL_GET_CLOSE: 248 ret = (long)b->shutdown; 249 break; 250 case BIO_CTRL_SET_CLOSE: 251 b->shutdown = (int)num; 252 break; 253 254 case BIO_CTRL_WPENDING: 255 ret = 0L; 256 break; 257 case BIO_CTRL_PENDING: 258 ret = (long)bm->length; 259 break; 260 case BIO_CTRL_DUP: 261 case BIO_CTRL_FLUSH: 262 ret = 1; 263 break; 264 case BIO_CTRL_PUSH: 265 case BIO_CTRL_POP: 266 default: 267 ret = 0; 268 break; 269 } 270 return (ret); 271 } 272 273 static int 274 mem_gets(BIO *bp, char *buf, int size) 275 { 276 int i, j; 277 int ret = -1; 278 char *p; 279 BUF_MEM *bm = (BUF_MEM *)bp->ptr; 280 281 BIO_clear_retry_flags(bp); 282 j = bm->length; 283 if ((size - 1) < j) 284 j = size - 1; 285 if (j <= 0) { 286 *buf = '\0'; 287 return 0; 288 } 289 p = bm->data; 290 for (i = 0; i < j; i++) { 291 if (p[i] == '\n') { 292 i++; 293 break; 294 } 295 } 296 297 /* 298 * i is now the max num of bytes to copy, either j or up to 299 * and including the first newline 300 */ 301 302 i = mem_read(bp, buf, i); 303 if (i > 0) 304 buf[i] = '\0'; 305 ret = i; 306 return (ret); 307 } 308 309 static int 310 mem_puts(BIO *bp, const char *str) 311 { 312 int n, ret; 313 314 n = strlen(str); 315 ret = mem_write(bp, str, n); 316 /* memory semantics is that it will always work */ 317 return (ret); 318 } 319