bss_mem.c revision 280297
155714Skris/* crypto/bio/bss_mem.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280297Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280297Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280297Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280297Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280297Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280297Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <stdio.h> 6055714Skris#include <errno.h> 6155714Skris#include "cryptlib.h" 6255714Skris#include <openssl/bio.h> 6355714Skris 6468651Skrisstatic int mem_write(BIO *h, const char *buf, int num); 6568651Skrisstatic int mem_read(BIO *h, char *buf, int size); 6668651Skrisstatic int mem_puts(BIO *h, const char *str); 6768651Skrisstatic int mem_gets(BIO *h, char *str, int size); 6868651Skrisstatic long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2); 6955714Skrisstatic int mem_new(BIO *h); 7055714Skrisstatic int mem_free(BIO *data); 71280297Sjkimstatic BIO_METHOD mem_method = { 72280297Sjkim BIO_TYPE_MEM, 73280297Sjkim "memory buffer", 74280297Sjkim mem_write, 75280297Sjkim mem_read, 76280297Sjkim mem_puts, 77280297Sjkim mem_gets, 78280297Sjkim mem_ctrl, 79280297Sjkim mem_new, 80280297Sjkim mem_free, 81280297Sjkim NULL, 82280297Sjkim}; 8355714Skris 84280297Sjkim/* 85280297Sjkim * bio->num is used to hold the value to return on 'empty', if it is 0, 86280297Sjkim * should_retry is not set 87280297Sjkim */ 8855714Skris 8955714SkrisBIO_METHOD *BIO_s_mem(void) 90280297Sjkim{ 91280297Sjkim return (&mem_method); 92280297Sjkim} 9355714Skris 9459191SkrisBIO *BIO_new_mem_buf(void *buf, int len) 9559191Skris{ 96280297Sjkim BIO *ret; 97280297Sjkim BUF_MEM *b; 98280297Sjkim size_t sz; 99238405Sjkim 100280297Sjkim if (!buf) { 101280297Sjkim BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER); 102280297Sjkim return NULL; 103280297Sjkim } 104280297Sjkim sz = (len < 0) ? strlen(buf) : (size_t)len; 105280297Sjkim if (!(ret = BIO_new(BIO_s_mem()))) 106280297Sjkim return NULL; 107280297Sjkim b = (BUF_MEM *)ret->ptr; 108280297Sjkim b->data = buf; 109280297Sjkim b->length = sz; 110280297Sjkim b->max = sz; 111280297Sjkim ret->flags |= BIO_FLAGS_MEM_RDONLY; 112280297Sjkim /* Since this is static data retrying wont help */ 113280297Sjkim ret->num = 0; 114280297Sjkim return ret; 11559191Skris} 11659191Skris 11755714Skrisstatic int mem_new(BIO *bi) 118280297Sjkim{ 119280297Sjkim BUF_MEM *b; 12055714Skris 121280297Sjkim if ((b = BUF_MEM_new()) == NULL) 122280297Sjkim return (0); 123280297Sjkim bi->shutdown = 1; 124280297Sjkim bi->init = 1; 125280297Sjkim bi->num = -1; 126280297Sjkim bi->ptr = (char *)b; 127280297Sjkim return (1); 128280297Sjkim} 12955714Skris 13055714Skrisstatic int mem_free(BIO *a) 131280297Sjkim{ 132280297Sjkim if (a == NULL) 133280297Sjkim return (0); 134280297Sjkim if (a->shutdown) { 135280297Sjkim if ((a->init) && (a->ptr != NULL)) { 136280297Sjkim BUF_MEM *b; 137280297Sjkim b = (BUF_MEM *)a->ptr; 138280297Sjkim if (a->flags & BIO_FLAGS_MEM_RDONLY) 139280297Sjkim b->data = NULL; 140280297Sjkim BUF_MEM_free(b); 141280297Sjkim a->ptr = NULL; 142280297Sjkim } 143280297Sjkim } 144280297Sjkim return (1); 145280297Sjkim} 146280297Sjkim 14755714Skrisstatic int mem_read(BIO *b, char *out, int outl) 148280297Sjkim{ 149280297Sjkim int ret = -1; 150280297Sjkim BUF_MEM *bm; 15155714Skris 152280297Sjkim bm = (BUF_MEM *)b->ptr; 153280297Sjkim BIO_clear_retry_flags(b); 154280297Sjkim ret = (outl >= 0 && (size_t)outl > bm->length) ? (int)bm->length : outl; 155280297Sjkim if ((out != NULL) && (ret > 0)) { 156280297Sjkim memcpy(out, bm->data, ret); 157280297Sjkim bm->length -= ret; 158280297Sjkim if (b->flags & BIO_FLAGS_MEM_RDONLY) 159280297Sjkim bm->data += ret; 160280297Sjkim else { 161280297Sjkim memmove(&(bm->data[0]), &(bm->data[ret]), bm->length); 162280297Sjkim } 163280297Sjkim } else if (bm->length == 0) { 164280297Sjkim ret = b->num; 165280297Sjkim if (ret != 0) 166280297Sjkim BIO_set_retry_read(b); 167280297Sjkim } 168280297Sjkim return (ret); 169280297Sjkim} 17055714Skris 17168651Skrisstatic int mem_write(BIO *b, const char *in, int inl) 172280297Sjkim{ 173280297Sjkim int ret = -1; 174280297Sjkim int blen; 175280297Sjkim BUF_MEM *bm; 17655714Skris 177280297Sjkim bm = (BUF_MEM *)b->ptr; 178280297Sjkim if (in == NULL) { 179280297Sjkim BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER); 180280297Sjkim goto end; 181280297Sjkim } 18255714Skris 183280297Sjkim if (b->flags & BIO_FLAGS_MEM_RDONLY) { 184280297Sjkim BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO); 185280297Sjkim goto end; 186280297Sjkim } 18759191Skris 188280297Sjkim BIO_clear_retry_flags(b); 189280297Sjkim blen = bm->length; 190280297Sjkim if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl)) 191280297Sjkim goto end; 192280297Sjkim memcpy(&(bm->data[blen]), in, inl); 193280297Sjkim ret = inl; 194280297Sjkim end: 195280297Sjkim return (ret); 196280297Sjkim} 19755714Skris 19868651Skrisstatic long mem_ctrl(BIO *b, int cmd, long num, void *ptr) 199280297Sjkim{ 200280297Sjkim long ret = 1; 201280297Sjkim char **pptr; 20255714Skris 203280297Sjkim BUF_MEM *bm = (BUF_MEM *)b->ptr; 20455714Skris 205280297Sjkim switch (cmd) { 206280297Sjkim case BIO_CTRL_RESET: 207280297Sjkim if (bm->data != NULL) { 208280297Sjkim /* For read only case reset to the start again */ 209280297Sjkim if (b->flags & BIO_FLAGS_MEM_RDONLY) { 210280297Sjkim bm->data -= bm->max - bm->length; 211280297Sjkim bm->length = bm->max; 212280297Sjkim } else { 213280297Sjkim memset(bm->data, 0, bm->max); 214280297Sjkim bm->length = 0; 215280297Sjkim } 216280297Sjkim } 217280297Sjkim break; 218280297Sjkim case BIO_CTRL_EOF: 219280297Sjkim ret = (long)(bm->length == 0); 220280297Sjkim break; 221280297Sjkim case BIO_C_SET_BUF_MEM_EOF_RETURN: 222280297Sjkim b->num = (int)num; 223280297Sjkim break; 224280297Sjkim case BIO_CTRL_INFO: 225280297Sjkim ret = (long)bm->length; 226280297Sjkim if (ptr != NULL) { 227280297Sjkim pptr = (char **)ptr; 228280297Sjkim *pptr = (char *)&(bm->data[0]); 229280297Sjkim } 230280297Sjkim break; 231280297Sjkim case BIO_C_SET_BUF_MEM: 232280297Sjkim mem_free(b); 233280297Sjkim b->shutdown = (int)num; 234280297Sjkim b->ptr = ptr; 235280297Sjkim break; 236280297Sjkim case BIO_C_GET_BUF_MEM_PTR: 237280297Sjkim if (ptr != NULL) { 238280297Sjkim pptr = (char **)ptr; 239280297Sjkim *pptr = (char *)bm; 240280297Sjkim } 241280297Sjkim break; 242280297Sjkim case BIO_CTRL_GET_CLOSE: 243280297Sjkim ret = (long)b->shutdown; 244280297Sjkim break; 245280297Sjkim case BIO_CTRL_SET_CLOSE: 246280297Sjkim b->shutdown = (int)num; 247280297Sjkim break; 24855714Skris 249280297Sjkim case BIO_CTRL_WPENDING: 250280297Sjkim ret = 0L; 251280297Sjkim break; 252280297Sjkim case BIO_CTRL_PENDING: 253280297Sjkim ret = (long)bm->length; 254280297Sjkim break; 255280297Sjkim case BIO_CTRL_DUP: 256280297Sjkim case BIO_CTRL_FLUSH: 257280297Sjkim ret = 1; 258280297Sjkim break; 259280297Sjkim case BIO_CTRL_PUSH: 260280297Sjkim case BIO_CTRL_POP: 261280297Sjkim default: 262280297Sjkim ret = 0; 263280297Sjkim break; 264280297Sjkim } 265280297Sjkim return (ret); 266280297Sjkim} 26755714Skris 26855714Skrisstatic int mem_gets(BIO *bp, char *buf, int size) 269280297Sjkim{ 270280297Sjkim int i, j; 271280297Sjkim int ret = -1; 272280297Sjkim char *p; 273280297Sjkim BUF_MEM *bm = (BUF_MEM *)bp->ptr; 27455714Skris 275280297Sjkim BIO_clear_retry_flags(bp); 276280297Sjkim j = bm->length; 277280297Sjkim if ((size - 1) < j) 278280297Sjkim j = size - 1; 279280297Sjkim if (j <= 0) { 280280297Sjkim *buf = '\0'; 281280297Sjkim return 0; 282280297Sjkim } 283280297Sjkim p = bm->data; 284280297Sjkim for (i = 0; i < j; i++) { 285280297Sjkim if (p[i] == '\n') { 286280297Sjkim i++; 287280297Sjkim break; 288280297Sjkim } 289280297Sjkim } 290194206Ssimon 291280297Sjkim /* 292280297Sjkim * i is now the max num of bytes to copy, either j or up to 293280297Sjkim * and including the first newline 294280297Sjkim */ 295194206Ssimon 296280297Sjkim i = mem_read(bp, buf, i); 297280297Sjkim if (i > 0) 298280297Sjkim buf[i] = '\0'; 299280297Sjkim ret = i; 300280297Sjkim return (ret); 301280297Sjkim} 30255714Skris 30368651Skrisstatic int mem_puts(BIO *bp, const char *str) 304280297Sjkim{ 305280297Sjkim int n, ret; 30655714Skris 307280297Sjkim n = strlen(str); 308280297Sjkim ret = mem_write(bp, str, n); 309280297Sjkim /* memory semantics is that it will always work */ 310280297Sjkim return (ret); 311280297Sjkim} 312