518 lines
15 KiB
C
518 lines
15 KiB
C
/* crypto/bio/bf_buff.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 buffer_write(BIO *h, const char *buf, int num);
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static int buffer_read(BIO *h, char *buf, int size);
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static int buffer_puts(BIO *h, const char *str);
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static int buffer_gets(BIO *h, char *str, int size);
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static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int buffer_new(BIO *h);
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static int buffer_free(BIO *data);
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static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
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#define DEFAULT_BUFFER_SIZE 4096
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static BIO_METHOD methods_buffer = {
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BIO_TYPE_BUFFER,
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"buffer",
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buffer_write,
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buffer_read,
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buffer_puts,
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buffer_gets,
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buffer_ctrl,
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buffer_new,
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buffer_free,
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buffer_callback_ctrl,
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};
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BIO_METHOD *BIO_f_buffer(void)
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{
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return (&methods_buffer);
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}
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static int buffer_new(BIO *bi)
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{
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BIO_F_BUFFER_CTX *ctx;
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ctx = (BIO_F_BUFFER_CTX *)OPENSSL_malloc(sizeof(BIO_F_BUFFER_CTX));
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if (ctx == NULL)
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return (0);
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ctx->ibuf = (char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
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if (ctx->ibuf == NULL) {
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OPENSSL_free(ctx);
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return (0);
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}
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ctx->obuf = (char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
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if (ctx->obuf == NULL) {
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OPENSSL_free(ctx->ibuf);
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OPENSSL_free(ctx);
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return (0);
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}
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ctx->ibuf_size = DEFAULT_BUFFER_SIZE;
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ctx->obuf_size = DEFAULT_BUFFER_SIZE;
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ctx->ibuf_len = 0;
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ctx->ibuf_off = 0;
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ctx->obuf_len = 0;
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ctx->obuf_off = 0;
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bi->init = 1;
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bi->ptr = (char *)ctx;
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bi->flags = 0;
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return (1);
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}
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static int buffer_free(BIO *a)
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{
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BIO_F_BUFFER_CTX *b;
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if (a == NULL)
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return (0);
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b = (BIO_F_BUFFER_CTX *)a->ptr;
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if (b->ibuf != NULL)
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OPENSSL_free(b->ibuf);
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if (b->obuf != NULL)
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OPENSSL_free(b->obuf);
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OPENSSL_free(a->ptr);
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a->ptr = NULL;
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a->init = 0;
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a->flags = 0;
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return (1);
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}
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static int buffer_read(BIO *b, char *out, int outl)
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{
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int i, num = 0;
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BIO_F_BUFFER_CTX *ctx;
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if (out == NULL)
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return (0);
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ctx = (BIO_F_BUFFER_CTX *)b->ptr;
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if ((ctx == NULL) || (b->next_bio == NULL))
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return (0);
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num = 0;
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BIO_clear_retry_flags(b);
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start:
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i = ctx->ibuf_len;
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/* If there is stuff left over, grab it */
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if (i != 0) {
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if (i > outl)
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i = outl;
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memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i);
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ctx->ibuf_off += i;
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ctx->ibuf_len -= i;
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num += i;
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if (outl == i)
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return (num);
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outl -= i;
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out += i;
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}
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/*
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* We may have done a partial read. try to do more. We have nothing in
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* the buffer. If we get an error and have read some data, just return it
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* and let them retry to get the error again. copy direct to parent
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* address space
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*/
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if (outl > ctx->ibuf_size) {
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for (;;) {
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i = BIO_read(b->next_bio, out, outl);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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if (i < 0)
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return ((num > 0) ? num : i);
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if (i == 0)
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return (num);
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}
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num += i;
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if (outl == i)
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return (num);
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out += i;
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outl -= i;
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}
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}
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/* else */
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/* we are going to be doing some buffering */
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i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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if (i < 0)
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return ((num > 0) ? num : i);
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if (i == 0)
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return (num);
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}
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ctx->ibuf_off = 0;
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ctx->ibuf_len = i;
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/* Lets re-read using ourselves :-) */
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goto start;
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}
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static int buffer_write(BIO *b, const char *in, int inl)
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{
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int i, num = 0;
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BIO_F_BUFFER_CTX *ctx;
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if ((in == NULL) || (inl <= 0))
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return (0);
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ctx = (BIO_F_BUFFER_CTX *)b->ptr;
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if ((ctx == NULL) || (b->next_bio == NULL))
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return (0);
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BIO_clear_retry_flags(b);
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start:
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i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off);
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/* add to buffer and return */
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if (i >= inl) {
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memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl);
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ctx->obuf_len += inl;
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return (num + inl);
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}
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/* else */
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/* stuff already in buffer, so add to it first, then flush */
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if (ctx->obuf_len != 0) {
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if (i > 0) { /* lets fill it up if we can */
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memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i);
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in += i;
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inl -= i;
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num += i;
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ctx->obuf_len += i;
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}
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/* we now have a full buffer needing flushing */
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for (;;) {
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i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]),
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ctx->obuf_len);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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if (i < 0)
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return ((num > 0) ? num : i);
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if (i == 0)
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return (num);
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}
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ctx->obuf_off += i;
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ctx->obuf_len -= i;
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if (ctx->obuf_len == 0)
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break;
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}
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}
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/*
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* we only get here if the buffer has been flushed and we still have
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* stuff to write
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*/
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ctx->obuf_off = 0;
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/* we now have inl bytes to write */
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while (inl >= ctx->obuf_size) {
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i = BIO_write(b->next_bio, in, inl);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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if (i < 0)
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return ((num > 0) ? num : i);
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if (i == 0)
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return (num);
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}
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num += i;
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in += i;
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inl -= i;
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if (inl == 0)
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return (num);
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}
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/*
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* copy the rest into the buffer since we have only a small amount left
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*/
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goto start;
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}
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static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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BIO *dbio;
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BIO_F_BUFFER_CTX *ctx;
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long ret = 1;
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char *p1, *p2;
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int r, i, *ip;
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int ibs, obs;
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ctx = (BIO_F_BUFFER_CTX *)b->ptr;
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switch (cmd) {
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case BIO_CTRL_RESET:
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ctx->ibuf_off = 0;
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ctx->ibuf_len = 0;
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ctx->obuf_off = 0;
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ctx->obuf_len = 0;
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if (b->next_bio == NULL)
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return (0);
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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case BIO_CTRL_INFO:
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ret = (long)ctx->obuf_len;
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break;
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case BIO_C_GET_BUFF_NUM_LINES:
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ret = 0;
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p1 = ctx->ibuf;
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for (i = 0; i < ctx->ibuf_len; i++) {
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if (p1[ctx->ibuf_off + i] == '\n')
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ret++;
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}
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break;
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case BIO_CTRL_WPENDING:
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ret = (long)ctx->obuf_len;
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if (ret == 0) {
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if (b->next_bio == NULL)
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return (0);
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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}
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break;
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case BIO_CTRL_PENDING:
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ret = (long)ctx->ibuf_len;
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if (ret == 0) {
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if (b->next_bio == NULL)
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return (0);
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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}
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break;
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case BIO_C_SET_BUFF_READ_DATA:
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if (num > ctx->ibuf_size) {
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p1 = OPENSSL_malloc((int)num);
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if (p1 == NULL)
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goto malloc_error;
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if (ctx->ibuf != NULL)
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OPENSSL_free(ctx->ibuf);
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ctx->ibuf = p1;
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}
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ctx->ibuf_off = 0;
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ctx->ibuf_len = (int)num;
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memcpy(ctx->ibuf, ptr, (int)num);
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ret = 1;
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break;
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case BIO_C_SET_BUFF_SIZE:
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if (ptr != NULL) {
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ip = (int *)ptr;
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if (*ip == 0) {
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ibs = (int)num;
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obs = ctx->obuf_size;
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} else { /* if (*ip == 1) */
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ibs = ctx->ibuf_size;
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obs = (int)num;
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}
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} else {
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ibs = (int)num;
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obs = (int)num;
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}
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p1 = ctx->ibuf;
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p2 = ctx->obuf;
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if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) {
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p1 = (char *)OPENSSL_malloc((int)num);
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if (p1 == NULL)
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goto malloc_error;
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}
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if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) {
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p2 = (char *)OPENSSL_malloc((int)num);
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if (p2 == NULL) {
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if (p1 != ctx->ibuf)
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OPENSSL_free(p1);
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goto malloc_error;
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}
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}
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if (ctx->ibuf != p1) {
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OPENSSL_free(ctx->ibuf);
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ctx->ibuf = p1;
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ctx->ibuf_off = 0;
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ctx->ibuf_len = 0;
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ctx->ibuf_size = ibs;
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}
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if (ctx->obuf != p2) {
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OPENSSL_free(ctx->obuf);
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ctx->obuf = p2;
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ctx->obuf_off = 0;
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ctx->obuf_len = 0;
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ctx->obuf_size = obs;
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}
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break;
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case BIO_C_DO_STATE_MACHINE:
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if (b->next_bio == NULL)
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return (0);
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BIO_clear_retry_flags(b);
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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BIO_copy_next_retry(b);
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break;
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case BIO_CTRL_FLUSH:
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if (b->next_bio == NULL)
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return (0);
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if (ctx->obuf_len <= 0) {
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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}
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for (;;) {
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BIO_clear_retry_flags(b);
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if (ctx->obuf_len > 0) {
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r = BIO_write(b->next_bio,
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&(ctx->obuf[ctx->obuf_off]), ctx->obuf_len);
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#if 0
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fprintf(stderr, "FLUSH [%3d] %3d -> %3d\n", ctx->obuf_off,
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ctx->obuf_len, r);
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#endif
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BIO_copy_next_retry(b);
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if (r <= 0)
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return ((long)r);
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ctx->obuf_off += r;
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ctx->obuf_len -= r;
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} else {
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ctx->obuf_len = 0;
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ctx->obuf_off = 0;
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ret = 1;
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break;
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}
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}
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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case BIO_CTRL_DUP:
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dbio = (BIO *)ptr;
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if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) ||
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!BIO_set_write_buffer_size(dbio, ctx->obuf_size))
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ret = 0;
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break;
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default:
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if (b->next_bio == NULL)
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return (0);
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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}
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return (ret);
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malloc_error:
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BIOerr(BIO_F_BUFFER_CTRL, ERR_R_MALLOC_FAILURE);
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return (0);
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}
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static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
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{
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long ret = 1;
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if (b->next_bio == NULL)
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return (0);
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switch (cmd) {
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default:
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ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
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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 buffer_gets(BIO *b, char *buf, int size)
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{
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BIO_F_BUFFER_CTX *ctx;
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int num = 0, i, flag;
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char *p;
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ctx = (BIO_F_BUFFER_CTX *)b->ptr;
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size--; /* reserve space for a '\0' */
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BIO_clear_retry_flags(b);
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for (;;) {
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if (ctx->ibuf_len > 0) {
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p = &(ctx->ibuf[ctx->ibuf_off]);
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flag = 0;
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for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) {
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*(buf++) = p[i];
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if (p[i] == '\n') {
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flag = 1;
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i++;
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break;
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}
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}
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num += i;
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size -= i;
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ctx->ibuf_len -= i;
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ctx->ibuf_off += i;
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if (flag || size == 0) {
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*buf = '\0';
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return (num);
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}
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} else { /* read another chunk */
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i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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*buf = '\0';
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if (i < 0)
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return ((num > 0) ? num : i);
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if (i == 0)
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return (num);
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}
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ctx->ibuf_len = i;
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ctx->ibuf_off = 0;
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}
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}
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}
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static int buffer_puts(BIO *b, const char *str)
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{
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return (buffer_write(b, str, strlen(str)));
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}
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