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,char *buf,int num); 65 static int mem_read(BIO *h,char *buf,int size); 66 static int mem_puts(BIO *h,char *str); 67 static int mem_gets(BIO *h,char *str,int size); 68 static long mem_ctrl(BIO *h,int cmd,long arg1,char *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 }; 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 *BIO_s_mem(void) 88 { 89 return(&mem_method); 90 } 91 92 static int mem_new(BIO *bi) 93 { 94 BUF_MEM *b; 95 96 if ((b=BUF_MEM_new()) == NULL) 97 return(0); 98 bi->shutdown=1; 99 bi->init=1; 100 bi->num= -1; 101 bi->ptr=(char *)b; 102 return(1); 103 } 104 105 static int mem_free(BIO *a) 106 { 107 if (a == NULL) return(0); 108 if (a->shutdown) 109 { 110 if ((a->init) && (a->ptr != NULL)) 111 { 112 BUF_MEM_free((BUF_MEM *)a->ptr); 113 a->ptr=NULL; 114 } 115 } 116 return(1); 117 } 118 119 static int mem_read(BIO *b, char *out, int outl) 120 { 121 int ret= -1; 122 BUF_MEM *bm; 123 int i; 124 char *from,*to; 125 126 bm=(BUF_MEM *)b->ptr; 127 BIO_clear_retry_flags(b); 128 ret=(outl > bm->length)?bm->length:outl; 129 if ((out != NULL) && (ret > 0)) 130 { 131 memcpy(out,bm->data,ret); 132 bm->length-=ret; 133 /* memmove(&(bm->data[0]),&(bm->data[ret]), bm->length); */ 134 from=(char *)&(bm->data[ret]); 135 to=(char *)&(bm->data[0]); 136 for (i=0; i<bm->length; i++) 137 to[i]=from[i]; 138 } 139 else if (bm->length == 0) 140 { 141 if (b->num != 0) 142 BIO_set_retry_read(b); 143 ret= b->num; 144 } 145 return(ret); 146 } 147 148 static int mem_write(BIO *b, char *in, int inl) 149 { 150 int ret= -1; 151 int blen; 152 BUF_MEM *bm; 153 154 bm=(BUF_MEM *)b->ptr; 155 if (in == NULL) 156 { 157 BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER); 158 goto end; 159 } 160 161 BIO_clear_retry_flags(b); 162 blen=bm->length; 163 if (BUF_MEM_grow(bm,blen+inl) != (blen+inl)) 164 goto end; 165 memcpy(&(bm->data[blen]),in,inl); 166 ret=inl; 167 end: 168 return(ret); 169 } 170 171 static long mem_ctrl(BIO *b, int cmd, long num, char *ptr) 172 { 173 long ret=1; 174 char **pptr; 175 176 BUF_MEM *bm=(BUF_MEM *)b->ptr; 177 178 switch (cmd) 179 { 180 case BIO_CTRL_RESET: 181 if (bm->data != NULL) 182 memset(bm->data,0,bm->max); 183 bm->length=0; 184 break; 185 case BIO_CTRL_EOF: 186 ret=(long)(bm->length == 0); 187 break; 188 case BIO_C_SET_BUF_MEM_EOF_RETURN: 189 b->num=(int)num; 190 break; 191 case BIO_CTRL_INFO: 192 ret=(long)bm->length; 193 if (ptr != NULL) 194 { 195 pptr=(char **)ptr; 196 *pptr=(char *)&(bm->data[0]); 197 } 198 break; 199 case BIO_C_SET_BUF_MEM: 200 mem_free(b); 201 b->shutdown=(int)num; 202 b->ptr=ptr; 203 break; 204 case BIO_C_GET_BUF_MEM_PTR: 205 if (ptr != NULL) 206 { 207 pptr=(char **)ptr; 208 *pptr=(char *)bm; 209 } 210 break; 211 case BIO_CTRL_GET_CLOSE: 212 ret=(long)b->shutdown; 213 break; 214 case BIO_CTRL_SET_CLOSE: 215 b->shutdown=(int)num; 216 break; 217 218 case BIO_CTRL_WPENDING: 219 ret=0L; 220 break; 221 case BIO_CTRL_PENDING: 222 ret=(long)bm->length; 223 break; 224 case BIO_CTRL_DUP: 225 case BIO_CTRL_FLUSH: 226 ret=1; 227 break; 228 case BIO_CTRL_PUSH: 229 case BIO_CTRL_POP: 230 default: 231 ret=0; 232 break; 233 } 234 return(ret); 235 } 236 237 static int mem_gets(BIO *bp, char *buf, int size) 238 { 239 int i,j; 240 int ret= -1; 241 char *p; 242 BUF_MEM *bm=(BUF_MEM *)bp->ptr; 243 244 BIO_clear_retry_flags(bp); 245 j=bm->length; 246 if (j <= 0) return(0); 247 p=bm->data; 248 for (i=0; i<j; i++) 249 { 250 if (p[i] == '\n') break; 251 } 252 if (i == j) 253 { 254 BIO_set_retry_read(bp); 255 /* return(-1); change the semantics 0.6.6a */ 256 } 257 else 258 i++; 259 /* i is the max to copy */ 260 if ((size-1) < i) i=size-1; 261 i=mem_read(bp,buf,i); 262 if (i > 0) buf[i]='\0'; 263 ret=i; 264 return(ret); 265 } 266 267 static int mem_puts(BIO *bp, char *str) 268 { 269 int n,ret; 270 271 n=strlen(str); 272 ret=mem_write(bp,str,n); 273 /* memory semantics is that it will always work */ 274 return(ret); 275 } 276 277