1 /* $OpenBSD: bss_mem.c,v 1.13 2014/07/11 08:44:47 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 <openssl/bio.h> 64 #include <openssl/err.h> 65 #include <openssl/buffer.h> 66 67 static int mem_write(BIO *h, const char *buf, int num); 68 static int mem_read(BIO *h, char *buf, int size); 69 static int mem_puts(BIO *h, const char *str); 70 static int mem_gets(BIO *h, char *str, int size); 71 static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2); 72 static int mem_new(BIO *h); 73 static int mem_free(BIO *data); 74 75 static BIO_METHOD mem_method = { 76 .type = BIO_TYPE_MEM, 77 .name = "memory buffer", 78 .bwrite = mem_write, 79 .bread = mem_read, 80 .bputs = mem_puts, 81 .bgets = mem_gets, 82 .ctrl = mem_ctrl, 83 .create = mem_new, 84 .destroy = mem_free 85 }; 86 87 /* bio->num is used to hold the value to return on 'empty', if it is 88 * 0, should_retry is not set */ 89 90 BIO_METHOD * 91 BIO_s_mem(void) 92 { 93 return (&mem_method); 94 } 95 96 BIO * 97 BIO_new_mem_buf(void *buf, int len) 98 { 99 BIO *ret; 100 BUF_MEM *b; 101 size_t sz; 102 103 if (!buf) { 104 BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER); 105 return NULL; 106 } 107 sz = (len < 0) ? strlen(buf) : (size_t)len; 108 if (!(ret = BIO_new(BIO_s_mem()))) 109 return NULL; 110 b = (BUF_MEM *)ret->ptr; 111 b->data = buf; 112 b->length = sz; 113 b->max = sz; 114 ret->flags |= BIO_FLAGS_MEM_RDONLY; 115 /* Since this is static data retrying wont help */ 116 ret->num = 0; 117 return ret; 118 } 119 120 static int 121 mem_new(BIO *bi) 122 { 123 BUF_MEM *b; 124 125 if ((b = BUF_MEM_new()) == NULL) 126 return (0); 127 bi->shutdown = 1; 128 bi->init = 1; 129 bi->num = -1; 130 bi->ptr = (char *)b; 131 return (1); 132 } 133 134 static int 135 mem_free(BIO *a) 136 { 137 if (a == NULL) 138 return (0); 139 if (a->shutdown) { 140 if ((a->init) && (a->ptr != NULL)) { 141 BUF_MEM *b; 142 b = (BUF_MEM *)a->ptr; 143 if (a->flags & BIO_FLAGS_MEM_RDONLY) 144 b->data = NULL; 145 BUF_MEM_free(b); 146 a->ptr = NULL; 147 } 148 } 149 return (1); 150 } 151 152 static int 153 mem_read(BIO *b, char *out, int outl) 154 { 155 int ret = -1; 156 BUF_MEM *bm; 157 158 bm = (BUF_MEM *)b->ptr; 159 BIO_clear_retry_flags(b); 160 ret = (outl >=0 && (size_t)outl > bm->length) ? (int)bm->length : outl; 161 if ((out != NULL) && (ret > 0)) { 162 memcpy(out, bm->data, ret); 163 bm->length -= ret; 164 if (b->flags & BIO_FLAGS_MEM_RDONLY) 165 bm->data += ret; 166 else { 167 memmove(&(bm->data[0]), &(bm->data[ret]), bm->length); 168 } 169 } else if (bm->length == 0) { 170 ret = b->num; 171 if (ret != 0) 172 BIO_set_retry_read(b); 173 } 174 return (ret); 175 } 176 177 static int 178 mem_write(BIO *b, const char *in, int inl) 179 { 180 int ret = -1; 181 int blen; 182 BUF_MEM *bm; 183 184 bm = (BUF_MEM *)b->ptr; 185 if (in == NULL) { 186 BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER); 187 goto end; 188 } 189 190 if (b->flags & BIO_FLAGS_MEM_RDONLY) { 191 BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO); 192 goto end; 193 } 194 195 BIO_clear_retry_flags(b); 196 blen = bm->length; 197 if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl)) 198 goto end; 199 memcpy(&(bm->data[blen]), in, inl); 200 ret = inl; 201 end: 202 return (ret); 203 } 204 205 static long 206 mem_ctrl(BIO *b, int cmd, long num, void *ptr) 207 { 208 long ret = 1; 209 char **pptr; 210 211 BUF_MEM *bm = (BUF_MEM *)b->ptr; 212 213 switch (cmd) { 214 case BIO_CTRL_RESET: 215 if (bm->data != NULL) { 216 /* For read only case reset to the start again */ 217 if (b->flags & BIO_FLAGS_MEM_RDONLY) { 218 bm->data -= bm->max - bm->length; 219 bm->length = bm->max; 220 } else { 221 memset(bm->data, 0, bm->max); 222 bm->length = 0; 223 } 224 } 225 break; 226 case BIO_CTRL_EOF: 227 ret = (long)(bm->length == 0); 228 break; 229 case BIO_C_SET_BUF_MEM_EOF_RETURN: 230 b->num = (int)num; 231 break; 232 case BIO_CTRL_INFO: 233 ret = (long)bm->length; 234 if (ptr != NULL) { 235 pptr = (char **)ptr; 236 *pptr = (char *)&(bm->data[0]); 237 } 238 break; 239 case BIO_C_SET_BUF_MEM: 240 mem_free(b); 241 b->shutdown = (int)num; 242 b->ptr = ptr; 243 break; 244 case BIO_C_GET_BUF_MEM_PTR: 245 if (ptr != NULL) { 246 pptr = (char **)ptr; 247 *pptr = (char *)bm; 248 } 249 break; 250 case BIO_CTRL_GET_CLOSE: 251 ret = (long)b->shutdown; 252 break; 253 case BIO_CTRL_SET_CLOSE: 254 b->shutdown = (int)num; 255 break; 256 257 case BIO_CTRL_WPENDING: 258 ret = 0L; 259 break; 260 case BIO_CTRL_PENDING: 261 ret = (long)bm->length; 262 break; 263 case BIO_CTRL_DUP: 264 case BIO_CTRL_FLUSH: 265 ret = 1; 266 break; 267 case BIO_CTRL_PUSH: 268 case BIO_CTRL_POP: 269 default: 270 ret = 0; 271 break; 272 } 273 return (ret); 274 } 275 276 static int 277 mem_gets(BIO *bp, char *buf, int size) 278 { 279 int i, j; 280 int ret = -1; 281 char *p; 282 BUF_MEM *bm = (BUF_MEM *)bp->ptr; 283 284 BIO_clear_retry_flags(bp); 285 j = bm->length; 286 if ((size - 1) < j) 287 j = size - 1; 288 if (j <= 0) { 289 *buf = '\0'; 290 return 0; 291 } 292 p = bm->data; 293 for (i = 0; i < j; i++) { 294 if (p[i] == '\n') { 295 i++; 296 break; 297 } 298 } 299 300 /* 301 * i is now the max num of bytes to copy, either j or up to 302 * and including the first newline 303 */ 304 305 i = mem_read(bp, buf, i); 306 if (i > 0) 307 buf[i] = '\0'; 308 ret = i; 309 return (ret); 310 } 311 312 static int 313 mem_puts(BIO *bp, const char *str) 314 { 315 int n, ret; 316 317 n = strlen(str); 318 ret = mem_write(bp, str, n); 319 /* memory semantics is that it will always work */ 320 return (ret); 321 } 322