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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_reader.h"
#include <debug.h>
typedef struct private_tls_reader_t private_tls_reader_t;
/**
* Private data of an tls_reader_t object.
*/
struct private_tls_reader_t {
/**
* Public tls_reader_t interface.
*/
tls_reader_t public;
/**
* Remaining data to process
*/
chunk_t buf;
};
METHOD(tls_reader_t, remaining, u_int32_t,
private_tls_reader_t *this)
{
return this->buf.len;
}
METHOD(tls_reader_t, peek, chunk_t,
private_tls_reader_t *this)
{
return this->buf;
}
METHOD(tls_reader_t, read_uint8, bool,
private_tls_reader_t *this, u_int8_t *res)
{
if (this->buf.len < 1)
{
DBG1(DBG_TLS, "%d bytes insufficient to parse uint%d TLS data",
this->buf.len, 8);
return FALSE;
}
*res = this->buf.ptr[0];
this->buf = chunk_skip(this->buf, 1);
return TRUE;
}
METHOD(tls_reader_t, read_uint16, bool,
private_tls_reader_t *this, u_int16_t *res)
{
if (this->buf.len < 2)
{
DBG1(DBG_TLS, "%d bytes insufficient to parse uint%d TLS data",
this->buf.len, 16);
return FALSE;
}
*res = untoh16(this->buf.ptr);
this->buf = chunk_skip(this->buf, 2);
return TRUE;
}
METHOD(tls_reader_t, read_uint24, bool,
private_tls_reader_t *this, u_int32_t *res)
{
if (this->buf.len < 3)
{
DBG1(DBG_TLS, "%d bytes insufficient to parse uint%d TLS data",
this->buf.len, 24);
return FALSE;
}
*res = untoh32(this->buf.ptr) >> 8;
this->buf = chunk_skip(this->buf, 3);
return TRUE;
}
METHOD(tls_reader_t, read_uint32, bool,
private_tls_reader_t *this, u_int32_t *res)
{
if (this->buf.len < 4)
{
DBG1(DBG_TLS, "%d bytes insufficient to parse uint%d TLS data",
this->buf.len, 32);
return FALSE;
}
*res = untoh32(this->buf.ptr);
this->buf = chunk_skip(this->buf, 4);
return TRUE;
}
METHOD(tls_reader_t, read_data, bool,
private_tls_reader_t *this, u_int32_t len, chunk_t *res)
{
if (this->buf.len < len)
{
DBG1(DBG_TLS, "%d bytes insufficient to parse %d bytes TLS data",
this->buf.len, len);
return FALSE;
}
*res = chunk_create(this->buf.ptr, len);
this->buf = chunk_skip(this->buf, len);
return TRUE;
}
METHOD(tls_reader_t, read_data8, bool,
private_tls_reader_t *this, chunk_t *res)
{
u_int8_t len;
if (!read_uint8(this, &len))
{
return FALSE;
}
return read_data(this, len, res);
}
METHOD(tls_reader_t, read_data16, bool,
private_tls_reader_t *this, chunk_t *res)
{
u_int16_t len;
if (!read_uint16(this, &len))
{
return FALSE;
}
return read_data(this, len, res);
}
METHOD(tls_reader_t, read_data24, bool,
private_tls_reader_t *this, chunk_t *res)
{
u_int32_t len;
if (!read_uint24(this, &len))
{
return FALSE;
}
return read_data(this, len, res);
}
METHOD(tls_reader_t, read_data32, bool,
private_tls_reader_t *this, chunk_t *res)
{
u_int32_t len;
if (!read_uint32(this, &len))
{
return FALSE;
}
return read_data(this, len, res);
}
METHOD(tls_reader_t, destroy, void,
private_tls_reader_t *this)
{
free(this);
}
/**
* See header
*/
tls_reader_t *tls_reader_create(chunk_t data)
{
private_tls_reader_t *this;
INIT(this,
.public = {
.remaining = _remaining,
.peek = _peek,
.read_uint8 = _read_uint8,
.read_uint16 = _read_uint16,
.read_uint24 = _read_uint24,
.read_uint32 = _read_uint32,
.read_data = _read_data,
.read_data8 = _read_data8,
.read_data16 = _read_data16,
.read_data24 = _read_data24,
.read_data32 = _read_data32,
.destroy = _destroy,
},
.buf = data,
);
return &this->public;
}
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