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 size_t sz; 98 99 if (!buf) { 100 BIOerr(BIO_F_BIO_NEW_MEM_BUF,BIO_R_NULL_PARAMETER); 101 return NULL; 102 } 103 sz = (len<0) ? strlen(buf) : (size_t)len; 104 if(!(ret = BIO_new(BIO_s_mem())) ) return NULL; 105 b = (BUF_MEM *)ret->ptr; 106 b->data = buf; 107 b->length = sz; 108 b->max = sz; 109 ret->flags |= BIO_FLAGS_MEM_RDONLY; 110 /* Since this is static data retrying wont help */ 111 ret->num = 0; 112 return ret; 113 } 114 115 static int mem_new(BIO *bi) 116 { 117 BUF_MEM *b; 118 119 if ((b=BUF_MEM_new()) == NULL) 120 return(0); 121 bi->shutdown=1; 122 bi->init=1; 123 bi->num= -1; 124 bi->ptr=(char *)b; 125 return(1); 126 } 127 128 static int mem_free(BIO *a) 129 { 130 if (a == NULL) return(0); 131 if (a->shutdown) 132 { 133 if ((a->init) && (a->ptr != NULL)) 134 { 135 BUF_MEM *b; 136 b = (BUF_MEM *)a->ptr; 137 if(a->flags & BIO_FLAGS_MEM_RDONLY) b->data = NULL; 138 BUF_MEM_free(b); 139 a->ptr=NULL; 140 } 141 } 142 return(1); 143 } 144 145 static int mem_read(BIO *b, char *out, int outl) 146 { 147 int ret= -1; 148 BUF_MEM *bm; 149 150 bm=(BUF_MEM *)b->ptr; 151 BIO_clear_retry_flags(b); 152 ret=(outl >=0 && (size_t)outl > bm->length)?(int)bm->length:outl; 153 if ((out != NULL) && (ret > 0)) { 154 memcpy(out,bm->data,ret); 155 bm->length-=ret; 156 if(b->flags & BIO_FLAGS_MEM_RDONLY) bm->data += ret; 157 else { 158 memmove(&(bm->data[0]),&(bm->data[ret]),bm->length); 159 } 160 } else if (bm->length == 0) 161 { 162 ret = b->num; 163 if (ret != 0) 164 BIO_set_retry_read(b); 165 } 166 return(ret); 167 } 168 169 static int mem_write(BIO *b, const char *in, int inl) 170 { 171 int ret= -1; 172 int blen; 173 BUF_MEM *bm; 174 175 bm=(BUF_MEM *)b->ptr; 176 if (in == NULL) 177 { 178 BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER); 179 goto end; 180 } 181 182 if(b->flags & BIO_FLAGS_MEM_RDONLY) { 183 BIOerr(BIO_F_MEM_WRITE,BIO_R_WRITE_TO_READ_ONLY_BIO); 184 goto end; 185 } 186 187 BIO_clear_retry_flags(b); 188 blen=bm->length; 189 if (BUF_MEM_grow_clean(bm,blen+inl) != (blen+inl)) 190 goto end; 191 memcpy(&(bm->data[blen]),in,inl); 192 ret=inl; 193 end: 194 return(ret); 195 } 196 197 static long mem_ctrl(BIO *b, int cmd, long num, void *ptr) 198 { 199 long ret=1; 200 char **pptr; 201 202 BUF_MEM *bm=(BUF_MEM *)b->ptr; 203 204 switch (cmd) 205 { 206 case BIO_CTRL_RESET: 207 if (bm->data != NULL) 208 { 209 /* For read only case reset to the start again */ 210 if(b->flags & BIO_FLAGS_MEM_RDONLY) 211 { 212 bm->data -= bm->max - bm->length; 213 bm->length = bm->max; 214 } 215 else 216 { 217 memset(bm->data,0,bm->max); 218 bm->length=0; 219 } 220 } 221 break; 222 case BIO_CTRL_EOF: 223 ret=(long)(bm->length == 0); 224 break; 225 case BIO_C_SET_BUF_MEM_EOF_RETURN: 226 b->num=(int)num; 227 break; 228 case BIO_CTRL_INFO: 229 ret=(long)bm->length; 230 if (ptr != NULL) 231 { 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 { 244 pptr=(char **)ptr; 245 *pptr=(char *)bm; 246 } 247 break; 248 case BIO_CTRL_GET_CLOSE: 249 ret=(long)b->shutdown; 250 break; 251 case BIO_CTRL_SET_CLOSE: 252 b->shutdown=(int)num; 253 break; 254 255 case BIO_CTRL_WPENDING: 256 ret=0L; 257 break; 258 case BIO_CTRL_PENDING: 259 ret=(long)bm->length; 260 break; 261 case BIO_CTRL_DUP: 262 case BIO_CTRL_FLUSH: 263 ret=1; 264 break; 265 case BIO_CTRL_PUSH: 266 case BIO_CTRL_POP: 267 default: 268 ret=0; 269 break; 270 } 271 return(ret); 272 } 273 274 static int 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) j=size-1; 284 if (j <= 0) 285 { 286 *buf='\0'; 287 return 0; 288 } 289 p=bm->data; 290 for (i=0; i<j; i++) 291 { 292 if (p[i] == '\n') 293 { 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) buf[i]='\0'; 306 ret=i; 307 return(ret); 308 } 309 310 static int 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 } 319 320