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/* $OpenBSD: tls_bio_cb.c,v 1.19 2017/01/12 16:18:39 jsing Exp $ */
/*
* Copyright (c) 2016 Tobias Pape <tobias@netshed.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <openssl/bio.h>
#include <tls.h>
#include "tls_internal.h"
static int bio_cb_write(BIO *bio, const char *buf, int num);
static int bio_cb_read(BIO *bio, char *buf, int size);
static int bio_cb_puts(BIO *bio, const char *str);
static long bio_cb_ctrl(BIO *bio, int cmd, long num, void *ptr);
static BIO_METHOD bio_cb_method = {
.type = BIO_TYPE_MEM,
.name = "libtls_callbacks",
.bwrite = bio_cb_write,
.bread = bio_cb_read,
.bputs = bio_cb_puts,
.ctrl = bio_cb_ctrl,
};
static BIO_METHOD *
bio_s_cb(void)
{
return (&bio_cb_method);
}
static int
bio_cb_puts(BIO *bio, const char *str)
{
return (bio_cb_write(bio, str, strlen(str)));
}
static long
bio_cb_ctrl(BIO *bio, int cmd, long num, void *ptr)
{
long ret = 1;
switch (cmd) {
case BIO_CTRL_GET_CLOSE:
ret = (long)bio->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
bio->shutdown = (int)num;
break;
case BIO_CTRL_DUP:
case BIO_CTRL_FLUSH:
break;
case BIO_CTRL_INFO:
case BIO_CTRL_GET:
case BIO_CTRL_SET:
default:
ret = BIO_ctrl(bio->next_bio, cmd, num, ptr);
}
return (ret);
}
static int
bio_cb_write(BIO *bio, const char *buf, int num)
{
struct tls *ctx = bio->ptr;
int rv;
BIO_clear_retry_flags(bio);
rv = (ctx->write_cb)(ctx, buf, num, ctx->cb_arg);
if (rv == TLS_WANT_POLLIN) {
BIO_set_retry_read(bio);
rv = -1;
} else if (rv == TLS_WANT_POLLOUT) {
BIO_set_retry_write(bio);
rv = -1;
}
return (rv);
}
static int
bio_cb_read(BIO *bio, char *buf, int size)
{
struct tls *ctx = bio->ptr;
int rv;
BIO_clear_retry_flags(bio);
rv = (ctx->read_cb)(ctx, buf, size, ctx->cb_arg);
if (rv == TLS_WANT_POLLIN) {
BIO_set_retry_read(bio);
rv = -1;
} else if (rv == TLS_WANT_POLLOUT) {
BIO_set_retry_write(bio);
rv = -1;
}
return (rv);
}
int
tls_set_cbs(struct tls *ctx, tls_read_cb read_cb, tls_write_cb write_cb,
void *cb_arg)
{
int rv = -1;
BIO *bio;
if (read_cb == NULL || write_cb == NULL) {
tls_set_errorx(ctx, "no callbacks provided");
goto err;
}
ctx->read_cb = read_cb;
ctx->write_cb = write_cb;
ctx->cb_arg = cb_arg;
if ((bio = BIO_new(bio_s_cb())) == NULL) {
tls_set_errorx(ctx, "failed to create callback i/o");
goto err;
}
bio->ptr = ctx;
bio->init = 1;
SSL_set_bio(ctx->ssl_conn, bio, bio);
rv = 0;
err:
return (rv);
}
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