ref: c23504631008ce0bfaa5bec48acb2b04f4b49fd9
dir: /sys/src/ape/lib/openssl/crypto/bio/bf_nbio.c/
/* crypto/bio/bf_nbio.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include <errno.h>
#include "cryptlib.h"
#include <openssl/rand.h>
#include <openssl/bio.h>
/* BIO_put and BIO_get both add to the digest,
* BIO_gets returns the digest */
static int nbiof_write(BIO *h,const char *buf,int num);
static int nbiof_read(BIO *h,char *buf,int size);
static int nbiof_puts(BIO *h,const char *str);
static int nbiof_gets(BIO *h,char *str,int size);
static long nbiof_ctrl(BIO *h,int cmd,long arg1,void *arg2);
static int nbiof_new(BIO *h);
static int nbiof_free(BIO *data);
static long nbiof_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);
typedef struct nbio_test_st
{
/* only set if we sent a 'should retry' error */
int lrn;
int lwn;
} NBIO_TEST;
static BIO_METHOD methods_nbiof=
{
BIO_TYPE_NBIO_TEST,
"non-blocking IO test filter",
nbiof_write,
nbiof_read,
nbiof_puts,
nbiof_gets,
nbiof_ctrl,
nbiof_new,
nbiof_free,
nbiof_callback_ctrl,
};
BIO_METHOD *BIO_f_nbio_test(void)
{
return(&methods_nbiof);
}
static int nbiof_new(BIO *bi)
{
NBIO_TEST *nt;
if (!(nt=(NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST)))) return(0);
nt->lrn= -1;
nt->lwn= -1;
bi->ptr=(char *)nt;
bi->init=1;
bi->flags=0;
return(1);
}
static int nbiof_free(BIO *a)
{
if (a == NULL) return(0);
if (a->ptr != NULL)
OPENSSL_free(a->ptr);
a->ptr=NULL;
a->init=0;
a->flags=0;
return(1);
}
static int nbiof_read(BIO *b, char *out, int outl)
{
NBIO_TEST *nt;
int ret=0;
#if 1
int num;
unsigned char n;
#endif
if (out == NULL) return(0);
if (b->next_bio == NULL) return(0);
nt=(NBIO_TEST *)b->ptr;
BIO_clear_retry_flags(b);
#if 1
RAND_pseudo_bytes(&n,1);
num=(n&0x07);
if (outl > num) outl=num;
if (num == 0)
{
ret= -1;
BIO_set_retry_read(b);
}
else
#endif
{
ret=BIO_read(b->next_bio,out,outl);
if (ret < 0)
BIO_copy_next_retry(b);
}
return(ret);
}
static int nbiof_write(BIO *b, const char *in, int inl)
{
NBIO_TEST *nt;
int ret=0;
int num;
unsigned char n;
if ((in == NULL) || (inl <= 0)) return(0);
if (b->next_bio == NULL) return(0);
nt=(NBIO_TEST *)b->ptr;
BIO_clear_retry_flags(b);
#if 1
if (nt->lwn > 0)
{
num=nt->lwn;
nt->lwn=0;
}
else
{
RAND_pseudo_bytes(&n,1);
num=(n&7);
}
if (inl > num) inl=num;
if (num == 0)
{
ret= -1;
BIO_set_retry_write(b);
}
else
#endif
{
ret=BIO_write(b->next_bio,in,inl);
if (ret < 0)
{
BIO_copy_next_retry(b);
nt->lwn=inl;
}
}
return(ret);
}
static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
{
long ret;
if (b->next_bio == NULL) return(0);
switch (cmd)
{
case BIO_C_DO_STATE_MACHINE:
BIO_clear_retry_flags(b);
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
BIO_copy_next_retry(b);
break;
case BIO_CTRL_DUP:
ret=0L;
break;
default:
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
}
return(ret);
}
static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
{
long ret=1;
if (b->next_bio == NULL) return(0);
switch (cmd)
{
default:
ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
break;
}
return(ret);
}
static int nbiof_gets(BIO *bp, char *buf, int size)
{
if (bp->next_bio == NULL) return(0);
return(BIO_gets(bp->next_bio,buf,size));
}
static int nbiof_puts(BIO *bp, const char *str)
{
if (bp->next_bio == NULL) return(0);
return(BIO_puts(bp->next_bio,str));
}