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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "tls_socket.h"
#include <unistd.h>
#include <debug.h>
typedef struct private_tls_socket_t private_tls_socket_t;
typedef struct private_tls_application_t private_tls_application_t;
struct private_tls_application_t {
/**
* Implements tls_application layer.
*/
tls_application_t application;
/**
* Chunk of data to send
*/
chunk_t out;
/**
* Chunk of data received
*/
chunk_t in;
};
/**
* Private data of an tls_socket_t object.
*/
struct private_tls_socket_t {
/**
* Public tls_socket_t interface.
*/
tls_socket_t public;
/**
* TLS application implementation
*/
private_tls_application_t app;
/**
* TLS stack
*/
tls_t *tls;
/**
* Underlying OS socket
*/
int fd;
};
METHOD(tls_application_t, process, status_t,
private_tls_application_t *this, tls_reader_t *reader)
{
chunk_t data;
if (!reader->read_data(reader, reader->remaining(reader), &data))
{
return FAILED;
}
this->in = chunk_cat("mc", this->in, data);
return NEED_MORE;
}
METHOD(tls_application_t, build, status_t,
private_tls_application_t *this, tls_writer_t *writer)
{
if (this->out.len)
{
writer->write_data(writer, this->out);
this->out = chunk_empty;
return NEED_MORE;
}
return INVALID_STATE;
}
/**
* TLS data exchange loop
*/
static bool exchange(private_tls_socket_t *this, bool wr)
{
char buf[1024];
ssize_t len;
int round = 0;
for (round = 0; TRUE; round++)
{
while (TRUE)
{
len = sizeof(buf);
switch (this->tls->build(this->tls, buf, &len, NULL))
{
case NEED_MORE:
case ALREADY_DONE:
len = write(this->fd, buf, len);
if (len == -1)
{
return FALSE;
}
continue;
case INVALID_STATE:
break;
default:
return FALSE;
}
break;
}
if (wr)
{
if (this->app.out.len == 0)
{ /* all data written */
return TRUE;
}
}
else
{
if (this->app.in.len)
{ /* some data received */
return TRUE;
}
if (round > 0)
{ /* did some handshaking, return empty chunk to not block */
return TRUE;
}
}
len = read(this->fd, buf, sizeof(buf));
if (len <= 0)
{
return FALSE;
}
if (this->tls->process(this->tls, buf, len) != NEED_MORE)
{
return FALSE;
}
}
}
METHOD(tls_socket_t, read_, bool,
private_tls_socket_t *this, chunk_t *buf)
{
if (exchange(this, FALSE))
{
*buf = this->app.in;
this->app.in = chunk_empty;
return TRUE;
}
return FALSE;
}
METHOD(tls_socket_t, write_, bool,
private_tls_socket_t *this, chunk_t buf)
{
this->app.out = buf;
if (exchange(this, TRUE))
{
return TRUE;
}
return FALSE;
}
METHOD(tls_socket_t, destroy, void,
private_tls_socket_t *this)
{
this->tls->destroy(this->tls);
free(this->app.in.ptr);
free(this);
}
/**
* See header
*/
tls_socket_t *tls_socket_create(bool is_server, identification_t *server,
identification_t *peer, int fd)
{
private_tls_socket_t *this;
INIT(this,
.public = {
.read = _read_,
.write = _write_,
.destroy = _destroy,
},
.app = {
.application = {
.build = _build,
.process = _process,
.destroy = (void*)nop,
},
},
.fd = fd,
);
this->tls = tls_create(is_server, server, peer, TLS_PURPOSE_GENERIC,
&this->app.application);
if (!this->tls)
{
free(this);
return NULL;
}
return &this->public;
}
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