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311 lines
8.5 KiB
311 lines
8.5 KiB
/* crypto/bio/bss_mem.c */ |
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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* All rights reserved. |
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* |
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* This package is an SSL implementation written |
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* by Eric Young (eay@cryptsoft.com). |
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* The implementation was written so as to conform with Netscapes SSL. |
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* |
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* This library is free for commercial and non-commercial use as long as |
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* the following conditions are aheared to. The following conditions |
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* apply to all code found in this distribution, be it the RC4, RSA, |
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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* included with this distribution is covered by the same copyright terms |
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* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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* |
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* Copyright remains Eric Young's, and as such any Copyright notices in |
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* the code are not to be removed. |
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* If this package is used in a product, Eric Young should be given attribution |
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* as the author of the parts of the library used. |
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* This can be in the form of a textual message at program startup or |
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* in documentation (online or textual) provided with the package. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* "This product includes cryptographic software written by |
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* Eric Young (eay@cryptsoft.com)" |
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* The word 'cryptographic' can be left out if the rouines from the library |
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* being used are not cryptographic related :-). |
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* 4. If you include any Windows specific code (or a derivative thereof) from |
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* the apps directory (application code) you must include an acknowledgement: |
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* The licence and distribution terms for any publically available version or |
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* derivative of this code cannot be changed. i.e. this code cannot simply be |
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* copied and put under another distribution licence |
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* [including the GNU Public Licence.] |
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*/ |
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#include <stdio.h> |
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#include <errno.h> |
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#include "cryptlib.h" |
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#include <openssl/bio.h> |
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static int mem_write(BIO *h, const char *buf, int num); |
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static int mem_read(BIO *h, char *buf, int size); |
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static int mem_puts(BIO *h, const char *str); |
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static int mem_gets(BIO *h, char *str, int size); |
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static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2); |
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static int mem_new(BIO *h); |
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static int mem_free(BIO *data); |
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static BIO_METHOD mem_method = { |
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BIO_TYPE_MEM, |
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"memory buffer", |
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mem_write, |
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mem_read, |
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mem_puts, |
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mem_gets, |
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mem_ctrl, |
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mem_new, |
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mem_free, |
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NULL, |
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}; |
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/* |
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* bio->num is used to hold the value to return on 'empty', if it is 0, |
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* should_retry is not set |
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*/ |
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BIO_METHOD *BIO_s_mem(void) |
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{ |
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return (&mem_method); |
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} |
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BIO *BIO_new_mem_buf(void *buf, int len) |
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{ |
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BIO *ret; |
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BUF_MEM *b; |
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size_t sz; |
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if (!buf) { |
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BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER); |
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return NULL; |
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} |
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sz = (len < 0) ? strlen(buf) : (size_t)len; |
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if (!(ret = BIO_new(BIO_s_mem()))) |
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return NULL; |
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b = (BUF_MEM *)ret->ptr; |
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b->data = buf; |
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b->length = sz; |
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b->max = sz; |
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ret->flags |= BIO_FLAGS_MEM_RDONLY; |
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/* Since this is static data retrying wont help */ |
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ret->num = 0; |
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return ret; |
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} |
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static int mem_new(BIO *bi) |
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{ |
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BUF_MEM *b; |
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if ((b = BUF_MEM_new()) == NULL) |
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return (0); |
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bi->shutdown = 1; |
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bi->init = 1; |
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bi->num = -1; |
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bi->ptr = (char *)b; |
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return (1); |
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} |
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static int mem_free(BIO *a) |
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{ |
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if (a == NULL) |
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return (0); |
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if (a->shutdown) { |
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if ((a->init) && (a->ptr != NULL)) { |
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BUF_MEM *b; |
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b = (BUF_MEM *)a->ptr; |
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if (a->flags & BIO_FLAGS_MEM_RDONLY) |
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b->data = NULL; |
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BUF_MEM_free(b); |
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a->ptr = NULL; |
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} |
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} |
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return (1); |
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} |
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static int mem_read(BIO *b, char *out, int outl) |
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{ |
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int ret = -1; |
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BUF_MEM *bm; |
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bm = (BUF_MEM *)b->ptr; |
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BIO_clear_retry_flags(b); |
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ret = (outl >= 0 && (size_t)outl > bm->length) ? (int)bm->length : outl; |
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if ((out != NULL) && (ret > 0)) { |
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memcpy(out, bm->data, ret); |
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bm->length -= ret; |
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if (b->flags & BIO_FLAGS_MEM_RDONLY) |
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bm->data += ret; |
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else { |
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memmove(&(bm->data[0]), &(bm->data[ret]), bm->length); |
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} |
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} else if (bm->length == 0) { |
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ret = b->num; |
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if (ret != 0) |
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BIO_set_retry_read(b); |
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} |
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return (ret); |
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} |
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static int mem_write(BIO *b, const char *in, int inl) |
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{ |
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int ret = -1; |
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int blen; |
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BUF_MEM *bm; |
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bm = (BUF_MEM *)b->ptr; |
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if (in == NULL) { |
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BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER); |
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goto end; |
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} |
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if (b->flags & BIO_FLAGS_MEM_RDONLY) { |
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BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO); |
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goto end; |
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} |
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BIO_clear_retry_flags(b); |
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blen = bm->length; |
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if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl)) |
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goto end; |
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memcpy(&(bm->data[blen]), in, inl); |
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ret = inl; |
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end: |
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return (ret); |
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} |
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static long mem_ctrl(BIO *b, int cmd, long num, void *ptr) |
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{ |
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long ret = 1; |
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char **pptr; |
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BUF_MEM *bm = (BUF_MEM *)b->ptr; |
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switch (cmd) { |
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case BIO_CTRL_RESET: |
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if (bm->data != NULL) { |
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/* For read only case reset to the start again */ |
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if (b->flags & BIO_FLAGS_MEM_RDONLY) { |
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bm->data -= bm->max - bm->length; |
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bm->length = bm->max; |
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} else { |
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memset(bm->data, 0, bm->max); |
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bm->length = 0; |
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} |
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} |
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break; |
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case BIO_CTRL_EOF: |
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ret = (long)(bm->length == 0); |
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break; |
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case BIO_C_SET_BUF_MEM_EOF_RETURN: |
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b->num = (int)num; |
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break; |
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case BIO_CTRL_INFO: |
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ret = (long)bm->length; |
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if (ptr != NULL) { |
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pptr = (char **)ptr; |
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*pptr = (char *)&(bm->data[0]); |
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} |
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break; |
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case BIO_C_SET_BUF_MEM: |
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mem_free(b); |
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b->shutdown = (int)num; |
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b->ptr = ptr; |
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break; |
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case BIO_C_GET_BUF_MEM_PTR: |
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if (ptr != NULL) { |
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pptr = (char **)ptr; |
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*pptr = (char *)bm; |
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} |
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break; |
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case BIO_CTRL_GET_CLOSE: |
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ret = (long)b->shutdown; |
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break; |
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case BIO_CTRL_SET_CLOSE: |
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b->shutdown = (int)num; |
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break; |
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case BIO_CTRL_WPENDING: |
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ret = 0L; |
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break; |
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case BIO_CTRL_PENDING: |
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ret = (long)bm->length; |
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break; |
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case BIO_CTRL_DUP: |
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case BIO_CTRL_FLUSH: |
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ret = 1; |
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break; |
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case BIO_CTRL_PUSH: |
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case BIO_CTRL_POP: |
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default: |
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ret = 0; |
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break; |
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} |
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return (ret); |
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} |
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static int mem_gets(BIO *bp, char *buf, int size) |
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{ |
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int i, j; |
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int ret = -1; |
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char *p; |
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BUF_MEM *bm = (BUF_MEM *)bp->ptr; |
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BIO_clear_retry_flags(bp); |
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j = bm->length; |
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if ((size - 1) < j) |
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j = size - 1; |
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if (j <= 0) { |
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*buf = '\0'; |
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return 0; |
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} |
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p = bm->data; |
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for (i = 0; i < j; i++) { |
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if (p[i] == '\n') { |
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i++; |
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break; |
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} |
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} |
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/* |
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* i is now the max num of bytes to copy, either j or up to |
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* and including the first newline |
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*/ |
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i = mem_read(bp, buf, i); |
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if (i > 0) |
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buf[i] = '\0'; |
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ret = i; |
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return (ret); |
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} |
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static int mem_puts(BIO *bp, const char *str) |
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{ |
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int n, ret; |
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n = strlen(str); |
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ret = mem_write(bp, str, n); |
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/* memory semantics is that it will always work */ |
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return (ret); |
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}
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