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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <errno.h>
#include "bio_lcl.h"
#include "internal/cryptlib.h"
#include <openssl/rand.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 const 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,
};
const BIO_METHOD *BIO_f_nbio_test(void)
{
return (&methods_nbiof);
}
static int nbiof_new(BIO *bi)
{
NBIO_TEST *nt;
if ((nt = OPENSSL_zalloc(sizeof(*nt))) == NULL)
return (0);
nt->lrn = -1;
nt->lwn = -1;
bi->ptr = (char *)nt;
bi->init = 1;
return (1);
}
static int nbiof_free(BIO *a)
{
if (a == NULL)
return (0);
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)
{
int ret = 0;
int num;
unsigned char n;
if (out == NULL)
return (0);
if (b->next_bio == NULL)
return (0);
BIO_clear_retry_flags(b);
if (RAND_bytes(&n, 1) <= 0)
return -1;
num = (n & 0x07);
if (outl > num)
outl = num;
if (num == 0) {
ret = -1;
BIO_set_retry_read(b);
} else {
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 (nt->lwn > 0) {
num = nt->lwn;
nt->lwn = 0;
} else {
if (RAND_bytes(&n, 1) <= 0)
return -1;
num = (n & 7);
}
if (inl > num)
inl = num;
if (num == 0) {
ret = -1;
BIO_set_retry_write(b);
} else {
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));
}
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