398 lines
10 KiB
C
398 lines
10 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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#include <openssl/evp.h>
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static int linebuffer_write(BIO *h, const char *buf,int num);
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static int linebuffer_read(BIO *h, char *buf, int size);
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static int linebuffer_puts(BIO *h, const char *str);
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static int linebuffer_gets(BIO *h, char *str, int size);
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static long linebuffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int linebuffer_new(BIO *h);
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static int linebuffer_free(BIO *data);
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static long linebuffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
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/* A 10k maximum should be enough for most purposes */
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#define DEFAULT_LINEBUFFER_SIZE 1024*10
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/* #define DEBUG */
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static BIO_METHOD methods_linebuffer=
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{
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BIO_TYPE_LINEBUFFER,
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"linebuffer",
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linebuffer_write,
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linebuffer_read,
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linebuffer_puts,
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linebuffer_gets,
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linebuffer_ctrl,
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linebuffer_new,
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linebuffer_free,
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linebuffer_callback_ctrl,
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};
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BIO_METHOD *BIO_f_linebuffer(void)
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{
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return(&methods_linebuffer);
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}
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typedef struct bio_linebuffer_ctx_struct
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{
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char *obuf; /* the output char array */
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int obuf_size; /* how big is the output buffer */
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int obuf_len; /* how many bytes are in it */
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} BIO_LINEBUFFER_CTX;
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static int linebuffer_new(BIO *bi)
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{
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BIO_LINEBUFFER_CTX *ctx;
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ctx=(BIO_LINEBUFFER_CTX *)OPENSSL_malloc(sizeof(BIO_LINEBUFFER_CTX));
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if (ctx == NULL) return(0);
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ctx->obuf=(char *)OPENSSL_malloc(DEFAULT_LINEBUFFER_SIZE);
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if (ctx->obuf == NULL) { OPENSSL_free(ctx); return(0); }
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ctx->obuf_size=DEFAULT_LINEBUFFER_SIZE;
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ctx->obuf_len=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 linebuffer_free(BIO *a)
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{
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BIO_LINEBUFFER_CTX *b;
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if (a == NULL) return(0);
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b=(BIO_LINEBUFFER_CTX *)a->ptr;
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if (b->obuf != NULL) 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 linebuffer_read(BIO *b, char *out, int outl)
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{
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int ret=0;
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if (out == NULL) return(0);
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if (b->next_bio == NULL) return(0);
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ret=BIO_read(b->next_bio,out,outl);
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BIO_clear_retry_flags(b);
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BIO_copy_next_retry(b);
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return(ret);
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}
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static int linebuffer_write(BIO *b, const char *in, int inl)
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{
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int i,num=0,foundnl;
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BIO_LINEBUFFER_CTX *ctx;
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if ((in == NULL) || (inl <= 0)) return(0);
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ctx=(BIO_LINEBUFFER_CTX *)b->ptr;
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if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
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BIO_clear_retry_flags(b);
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do
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{
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const char *p;
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for(p = in; p < in + inl && *p != '\n'; p++)
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;
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if (*p == '\n')
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{
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p++;
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foundnl = 1;
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}
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else
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foundnl = 0;
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/* If a NL was found and we already have text in the save
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buffer, concatenate them and write */
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while ((foundnl || p - in > ctx->obuf_size - ctx->obuf_len)
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&& ctx->obuf_len > 0)
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{
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int orig_olen = ctx->obuf_len;
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i = ctx->obuf_size - ctx->obuf_len;
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if (p - in > 0)
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{
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if (i >= p - in)
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{
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memcpy(&(ctx->obuf[ctx->obuf_len]),
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in,p - in);
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ctx->obuf_len += p - in;
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inl -= p - in;
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num += p - in;
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in = p;
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}
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else
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{
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memcpy(&(ctx->obuf[ctx->obuf_len]),
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in,i);
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ctx->obuf_len += i;
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inl -= i;
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in += i;
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num += i;
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}
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}
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#if 0
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BIO_write(b->next_bio, "<*<", 3);
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#endif
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i=BIO_write(b->next_bio,
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ctx->obuf, ctx->obuf_len);
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if (i <= 0)
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{
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ctx->obuf_len = orig_olen;
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BIO_copy_next_retry(b);
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#if 0
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BIO_write(b->next_bio, ">*>", 3);
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#endif
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if (i < 0) return((num > 0)?num:i);
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if (i == 0) return(num);
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}
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#if 0
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BIO_write(b->next_bio, ">*>", 3);
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#endif
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if (i < ctx->obuf_len)
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memmove(ctx->obuf, ctx->obuf + i,
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ctx->obuf_len - i);
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ctx->obuf_len-=i;
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}
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/* Now that the save buffer is emptied, let's write the input
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buffer if a NL was found and there is anything to write. */
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if ((foundnl || p - in > ctx->obuf_size) && p - in > 0)
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{
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#if 0
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BIO_write(b->next_bio, "<*<", 3);
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#endif
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i=BIO_write(b->next_bio,in,p - in);
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if (i <= 0)
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{
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BIO_copy_next_retry(b);
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#if 0
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BIO_write(b->next_bio, ">*>", 3);
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#endif
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if (i < 0) return((num > 0)?num:i);
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if (i == 0) return(num);
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}
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#if 0
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BIO_write(b->next_bio, ">*>", 3);
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#endif
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num+=i;
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in+=i;
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inl-=i;
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}
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}
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while(foundnl && inl > 0);
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/* We've written as much as we can. The rest of the input buffer, if
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any, is text that doesn't and with a NL and therefore needs to be
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saved for the next trip. */
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if (inl > 0)
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{
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memcpy(&(ctx->obuf[ctx->obuf_len]), in, inl);
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ctx->obuf_len += inl;
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num += inl;
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}
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return num;
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}
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static long linebuffer_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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BIO *dbio;
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BIO_LINEBUFFER_CTX *ctx;
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long ret=1;
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char *p;
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int r;
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int obs;
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ctx=(BIO_LINEBUFFER_CTX *)b->ptr;
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switch (cmd)
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{
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case BIO_CTRL_RESET:
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ctx->obuf_len=0;
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if (b->next_bio == NULL) 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_CTRL_WPENDING:
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ret=(long)ctx->obuf_len;
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if (ret == 0)
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{
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if (b->next_bio == NULL) 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_SIZE:
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obs=(int)num;
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p=ctx->obuf;
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if ((obs > DEFAULT_LINEBUFFER_SIZE) && (obs != ctx->obuf_size))
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{
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p=(char *)OPENSSL_malloc((int)num);
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if (p == NULL)
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goto malloc_error;
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}
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if (ctx->obuf != p)
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{
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if (ctx->obuf_len > obs)
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{
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ctx->obuf_len = obs;
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}
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memcpy(p, ctx->obuf, ctx->obuf_len);
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OPENSSL_free(ctx->obuf);
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ctx->obuf=p;
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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) 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) return(0);
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if (ctx->obuf_len <= 0)
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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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}
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for (;;)
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{
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BIO_clear_retry_flags(b);
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if (ctx->obuf_len > 0)
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{
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r=BIO_write(b->next_bio,
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ctx->obuf, ctx->obuf_len);
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#if 0
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fprintf(stderr,"FLUSH %3d -> %3d\n",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) return((long)r);
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if (r < ctx->obuf_len)
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memmove(ctx->obuf, ctx->obuf + r,
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ctx->obuf_len - r);
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ctx->obuf_len-=r;
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}
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else
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{
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ctx->obuf_len=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_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) 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_LINEBUFFER_CTRL,ERR_R_MALLOC_FAILURE);
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return(0);
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}
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static long linebuffer_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) return(0);
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switch (cmd)
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{
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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 linebuffer_gets(BIO *b, char *buf, int size)
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{
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if (b->next_bio == NULL) return(0);
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return(BIO_gets(b->next_bio,buf,size));
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}
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static int linebuffer_puts(BIO *b, const char *str)
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{
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return(linebuffer_write(b,str,strlen(str)));
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}
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