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/* crypto/bio/bss_bio.c -*- Mode: C; c-file-style: "eay" -*- */
/* *** Not yet finished (or even tested). *** */
/* Special method for a BIO where the other endpoint is also a BIO
* of this kind, handled by the same thread.
* Such "BIO pairs" are mainly for using the SSL library with I/O interfaces
* for which no specific BIO method is available. */
#include <assert.h>
#include <stdlib.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/crypto.h>
static int bio_new(BIO *bio);
static int bio_free(BIO *bio);
static int bio_read(BIO *bio, char *buf, int size);
static int bio_write(BIO *bio, char *buf, int num);
static long bio_ctrl(BIO *bio, int cmd, long num, char *ptr);
static int bio_puts(BIO *bio, char *str);
static int bio_make_pair(BIO *bio1, BIO *bio2);
static void bio_destroy_pair(BIO *bio);
static BIO_METHOD methods_biop =
{
BIO_TYPE_BIO,
"BIO pair",
bio_write,
bio_read,
bio_puts,
NULL /* no bio_gets */,
bio_ctrl,
bio_new,
bio_free
};
BIO_METHOD *BIO_s_bio(void)
{
return &methods_biop;
}
struct bio_bio_st
{
BIO *peer; /* NULL if buf == NULL.
* If peer != NULL, then peer->ptr is also a bio_bio_st,
* and its "peer" member points back to us.
* peer != NULL iff init != 0 in the BIO. */
/* This is for what we write (i.e. reading uses peer's struct): */
int closed; /* valid iff peer != NULL */
size_t len; /* valid iff buf != NULL; 0 if peer == NULL */
size_t offset; /* valid iff buf != NULL; 0 if len == 0 */
size_t size;
char *buf; /* "size" elements (if != NULL) */
size_t request; /* valid iff peer != NULL; 0 if len != 0;
* otherwise set by peer to number of bytes
* it (unsuccesfully) tried to read. */
};
static int bio_new(BIO *bio)
{
struct bio_bio_st *b;
b = Malloc(sizeof *b);
if (b == NULL)
return 0;
b->peer = NULL;
b->size = 17*1024; /* enough for one TLS record (just a default) */
b->buf = NULL;
return 1;
}
static int bio_free(BIO *bio)
{
struct bio_bio_st *b;
if (bio == NULL)
return 0;
b = bio->ptr;
assert(b != NULL);
if (b->peer)
bio_destroy_pair(bio);
if (b->buf != NULL)
{
Free(b->buf);
}
Free(b);
return 1;
}
static int bio_read(BIO *bio, char *buf, int size)
{
/* XXX */
return -1;
}
static int bio_write(BIO *bio, char *buf, int num)
{
/* XXX */
return -1;
}
static long bio_ctrl(BIO *bio, int cmd, long num, char *ptr)
{
long ret;
struct bio_bio_st *b = bio->ptr;
assert(b != NULL);
switch (cmd)
{
/* XXX Additional commands: */
/* - Set buffer size */
/* - make pair */
/* - destroy pair */
/* - get number of bytes that the next write will accept */
/* - get number of bytes requested by peer */
/* - send "close" */
case BIO_CTRL_RESET:
if (b->buf != NULL)
{
b->len = 0;
b->offset = 0;
}
ret = 0;
break;
case BIO_CTRL_GET_CLOSE:
ret = bio->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
bio->shutdown = (int) num;
ret = 1;
break;
case BIO_CTRL_PENDING:
if (b->peer != NULL)
{
struct bio_bio_st *peer_b =b->peer->ptr;
ret = (long) peer_b->len;
}
else
ret = 0;
break;
case BIO_CTRL_WPENDING:
if (b->buf != NULL)
ret = (long) b->len;
else
ret = 0;
break;
case BIO_CTRL_DUP:
/* XXX */
ret = 1;
break;
case BIO_CTRL_FLUSH:
ret = 1;
break;
default:
ret = 0;
}
return ret;
}
static int bio_puts(BIO *bio, char *str)
{
return bio_write(bio, str, strlen(str));
}
/* Until bio_make_pair is used, make a dummy function use it for -pedantic */
void dummy() { bio_make_pair(NULL,NULL); }
static int bio_make_pair(BIO *bio1, BIO *bio2)
{
struct bio_bio_st *b1, *b2;
assert(bio1 != NULL);
assert(bio2 != NULL);
b1 = bio1->ptr;
b2 = bio2->ptr;
if (b1->peer != NULL || b2->peer != NULL)
{
BIOerr(BIO_F_BIO_MAKE_PAIR, BIO_R_IN_USE);
return 0;
}
if (b1->buf == NULL)
{
b1->buf = Malloc(b1->size);
if (b1->buf == NULL)
{
BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);
return 0;
}
b1->len = 0;
b1->offset = 0;
}
if (b2->buf == NULL)
{
b2->buf = Malloc(b2->size);
if (b2->buf == NULL)
{
BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);
return 0;
}
b2->len = 0;
b2->offset = 0;
}
b1->peer = bio2;
b1->closed = 0;
b1->request = 0;
b2->peer = bio1;
b2->closed = 0;
b2->request = 0;
bio1->init = 1;
bio2->init = 1;
return 1;
}
static void bio_destroy_pair(BIO *bio)
{
struct bio_bio_st *b = bio->ptr;
if (b != NULL)
{
BIO *peer_bio = b->peer;
if (peer_bio != NULL)
{
struct bio_bio_st *peer_b = peer_bio->ptr;
assert(peer_b != NULL);
assert(peer_b->peer == bio);
peer_b->peer = NULL;
peer_bio->init = 0;
assert(peer_b->buf != NULL);
peer_b->len = 0;
peer_b->offset = 0;
b->peer = NULL;
bio->init = 0;
assert(b->buf != NULL);
b->len = 0;
b->offset = 0;
}
}
}
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