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 { 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 *BIO_s_mem(void) 89 { 90 return(&mem_method); 91 } 92 93 BIO *BIO_new_mem_buf(void *buf, int len) 94 { 95 BIO *ret; 96 BUF_MEM *b; 97 if (!buf) { 98 BIOerr(BIO_F_BIO_NEW_MEM_BUF,BIO_R_NULL_PARAMETER); 99 return NULL; 100 } 101 if(len == -1) len = strlen(buf); 102 if(!(ret = BIO_new(BIO_s_mem())) ) return NULL; 103 b = (BUF_MEM *)ret->ptr; 104 b->data = buf; 105 b->length = len; 106 b->max = len; 107 ret->flags |= BIO_FLAGS_MEM_RDONLY; 108 /* Since this is static data retrying wont help */ 109 ret->num = 0; 110 return ret; 111 } 112 113 static int mem_new(BIO *bi) 114 { 115 BUF_MEM *b; 116 117 if ((b=BUF_MEM_new()) == NULL) 118 return(0); 119 bi->shutdown=1; 120 bi->init=1; 121 bi->num= -1; 122 bi->ptr=(char *)b; 123 return(1); 124 } 125 126 static int mem_free(BIO *a) 127 { 128 if (a == NULL) return(0); 129 if (a->shutdown) 130 { 131 if ((a->init) && (a->ptr != NULL)) 132 { 133 BUF_MEM *b; 134 b = (BUF_MEM *)a->ptr; 135 if(a->flags & BIO_FLAGS_MEM_RDONLY) b->data = NULL; 136 BUF_MEM_free(b); 137 a->ptr=NULL; 138 } 139 } 140 return(1); 141 } 142 143 static int mem_read(BIO *b, char *out, int outl) 144 { 145 int ret= -1; 146 BUF_MEM *bm; 147 int i; 148 char *from,*to; 149 150 bm=(BUF_MEM *)b->ptr; 151 BIO_clear_retry_flags(b); 152 ret=(outl > bm->length)?bm->length:outl; 153 if ((out != NULL) && (ret > 0)) { 154 memcpy(out,bm->data,ret); 155 bm->length-=ret; 156 /* memmove(&(bm->data[0]),&(bm->data[ret]), bm->length); */ 157 if(b->flags & BIO_FLAGS_MEM_RDONLY) bm->data += ret; 158 else { 159 from=(char *)&(bm->data[ret]); 160 to=(char *)&(bm->data[0]); 161 for (i=0; i<bm->length; i++) 162 to[i]=from[i]; 163 } 164 } else if (bm->length == 0) 165 { 166 ret = b->num; 167 if (ret != 0) 168 BIO_set_retry_read(b); 169 } 170 return(ret); 171 } 172 173 static int mem_write(BIO *b, const char *in, int inl) 174 { 175 int ret= -1; 176 int blen; 177 BUF_MEM *bm; 178 179 bm=(BUF_MEM *)b->ptr; 180 if (in == NULL) 181 { 182 BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER); 183 goto end; 184 } 185 186 if(b->flags & BIO_FLAGS_MEM_RDONLY) { 187 BIOerr(BIO_F_MEM_WRITE,BIO_R_WRITE_TO_READ_ONLY_BIO); 188 goto end; 189 } 190 191 BIO_clear_retry_flags(b); 192 blen=bm->length; 193 if (BUF_MEM_grow_clean(bm,blen+inl) != (blen+inl)) 194 goto end; 195 memcpy(&(bm->data[blen]),in,inl); 196 ret=inl; 197 end: 198 return(ret); 199 } 200 201 static long mem_ctrl(BIO *b, int cmd, long num, void *ptr) 202 { 203 long ret=1; 204 char **pptr; 205 206 BUF_MEM *bm=(BUF_MEM *)b->ptr; 207 208 switch (cmd) 209 { 210 case BIO_CTRL_RESET: 211 if (bm->data != NULL) 212 { 213 /* For read only case reset to the start again */ 214 if(b->flags & BIO_FLAGS_MEM_RDONLY) 215 { 216 bm->data -= bm->max - bm->length; 217 bm->length = bm->max; 218 } 219 else 220 { 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 { 236 pptr=(char **)ptr; 237 *pptr=(char *)&(bm->data[0]); 238 } 239 break; 240 case BIO_C_SET_BUF_MEM: 241 mem_free(b); 242 b->shutdown=(int)num; 243 b->ptr=ptr; 244 break; 245 case BIO_C_GET_BUF_MEM_PTR: 246 if (ptr != NULL) 247 { 248 pptr=(char **)ptr; 249 *pptr=(char *)bm; 250 } 251 break; 252 case BIO_CTRL_GET_CLOSE: 253 ret=(long)b->shutdown; 254 break; 255 case BIO_CTRL_SET_CLOSE: 256 b->shutdown=(int)num; 257 break; 258 259 case BIO_CTRL_WPENDING: 260 ret=0L; 261 break; 262 case BIO_CTRL_PENDING: 263 ret=(long)bm->length; 264 break; 265 case BIO_CTRL_DUP: 266 case BIO_CTRL_FLUSH: 267 ret=1; 268 break; 269 case BIO_CTRL_PUSH: 270 case BIO_CTRL_POP: 271 default: 272 ret=0; 273 break; 274 } 275 return(ret); 276 } 277 278 static int mem_gets(BIO *bp, char *buf, int size) 279 { 280 int i,j; 281 int ret= -1; 282 char *p; 283 BUF_MEM *bm=(BUF_MEM *)bp->ptr; 284 285 BIO_clear_retry_flags(bp); 286 j=bm->length; 287 if ((size-1) < j) j=size-1; 288 if (j <= 0) 289 { 290 *buf='\0'; 291 return 0; 292 } 293 p=bm->data; 294 for (i=0; i<j; i++) 295 { 296 if (p[i] == '\n') 297 { 298 i++; 299 break; 300 } 301 } 302 303 /* 304 * i is now the max num of bytes to copy, either j or up to 305 * and including the first newline 306 */ 307 308 i=mem_read(bp,buf,i); 309 if (i > 0) buf[i]='\0'; 310 ret=i; 311 return(ret); 312 } 313 314 static int mem_puts(BIO *bp, const char *str) 315 { 316 int n,ret; 317 318 n=strlen(str); 319 ret=mem_write(bp,str,n); 320 /* memory semantics is that it will always work */ 321 return(ret); 322 } 323 324