app-layer.h

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/* Copyright (C) 2007-2014 Open Information Security Foundation
 *
 * You can copy, redistribute or modify this Program under the terms of
 * the GNU General Public License version 2 as published by the Free
 * Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */
 
/**
 * \file
 *
 * \author Victor Julien <victor@inliniac.net>
 * \author Anoop Saldanha <anoopsaldanha@gmail.com>
 *
 *  Application layer handling and protocols implementation
 */
 
#ifndef SURICATA_APP_LAYER_H
#define SURICATA_APP_LAYER_H
 
#include "threadvars.h"
#include "decode.h"
#include "flow.h"
 
#include "stream-tcp-private.h"
#include "stream-tcp-reassemble.h"
 
 
#include "rust.h"
 
#define APP_LAYER_DATA_ALREADY_SENT_TO_APP_LAYER \
    (~STREAM_TOSERVER & ~STREAM_TOCLIENT)
 
/***** L7 layer dispatchers *****/
 
/**
 * \brief Handles reassembled tcp stream.
 */
int AppLayerHandleTCPData(ThreadVars *tv, TcpReassemblyThreadCtx *ra_ctx, Packet *p, Flow *f,
        TcpSession *ssn, TcpStream **stream, uint8_t *data, uint32_t data_len, uint8_t flags,
        enum StreamUpdateDir dir);
 
/**
 * \brief Handles an udp chunk.
 */
int AppLayerHandleUdp(ThreadVars *tv, AppLayerThreadCtx *app_tctx,
                      Packet *p, Flow *f);
 
/***** Utility *****/
 
/**
 * \brief Given a protocol string, returns the corresponding internal
 *        protocol id.
 *
 * \param The internal protocol id.
 */
AppProto AppLayerGetProtoByName(const char *alproto_name);
 
/**
 * \brief Given the internal protocol id, returns a string representation
 *        of the protocol.
 *
 * \param alproto The internal protocol id.
 *
 * \retval String representation of the protocol.
 */
const char *AppLayerGetProtoName(AppProto alproto);
 
void AppLayerListSupportedProtocols(void);
 
/***** Setup/General Registration *****/
 
/**
 * \brief Setup the app layer.
 *
 *        Includes protocol detection setup and the protocol parser setup.
 *
 * \retval 0 On success.
 * \retval -1 On failure.
 */
int AppLayerSetup(void);
 
/**
 * \brief De initializes the app layer.
 *
 *        Includes de initializing protocol detection and the protocol parser.
 */
int AppLayerDeSetup(void);
 
/**
 * \brief Creates a new app layer thread context.
 *
 * \retval Pointer to the newly create thread context, on success;
 *         NULL, on failure.
 */
AppLayerThreadCtx *AppLayerGetCtxThread(void);
 
/**
 * \brief Destroys the context created by AppLayerGetCtxThread().
 *
 * \param tctx Pointer to the thread context to destroy.
 */
void AppLayerDestroyCtxThread(AppLayerThreadCtx *tctx);
 
/**
 * \brief Registers per flow counters for all protocols
 *
 */
void AppLayerRegisterThreadCounters(ThreadVars *tv);
 
/***** Profiling *****/
 
void AppLayerProfilingResetInternal(AppLayerThreadCtx *app_tctx);
 
void AppLayerProfilingStoreInternal(AppLayerThreadCtx *app_tctx, Packet *p);
 
#ifdef PROFILING
#define AppLayerProfilingReset(app_tctx)    AppLayerProfilingResetInternal(app_tctx)
#define AppLayerProfilingStore(app_tctx, p) AppLayerProfilingStoreInternal(app_tctx, p)
#else
#define AppLayerProfilingReset(app_tctx)
#define AppLayerProfilingStore(app_tctx, p)
#endif
 
void AppLayerRegisterGlobalCounters(void);
 
/***** Unittests *****/
 
#ifdef UNITTESTS
void AppLayerUnittestsRegister(void);
#endif
 
void AppLayerIncTxCounter(ThreadVars *tv, Flow *f, uint64_t step);
void AppLayerIncGapErrorCounter(ThreadVars *tv, Flow *f);
void AppLayerIncAllocErrorCounter(ThreadVars *tv, Flow *f);
void AppLayerIncParserErrorCounter(ThreadVars *tv, Flow *f);
void AppLayerIncInternalErrorCounter(ThreadVars *tv, Flow *f);
 
static inline const uint8_t *StreamSliceGetData(const StreamSlice *stream_slice)
{
    return stream_slice->input;
}
 
static inline uint32_t StreamSliceGetDataLen(const StreamSlice *stream_slice)
{
    return stream_slice->input_len;
}
 
#endif