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/* Copyright (C) 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>
*/
#include "suricata-common.h"
#include "decode.h"
#include "flow.h"
#include "app-layer-events.h"
#include "app-layer-parser.h"
#include "util-enum.h"
/* events raised during protocol detection are stored in the
* packets storage, not in the flow. */
SCEnumCharMap app_layer_event_pkt_table[ ] = {
{ "APPLAYER_MISMATCH_PROTOCOL_BOTH_DIRECTIONS",
APPLAYER_MISMATCH_PROTOCOL_BOTH_DIRECTIONS },
{ "APPLAYER_WRONG_DIRECTION_FIRST_DATA",
APPLAYER_WRONG_DIRECTION_FIRST_DATA },
{ "APPLAYER_DETECT_PROTOCOL_ONLY_ONE_DIRECTION",
APPLAYER_DETECT_PROTOCOL_ONLY_ONE_DIRECTION },
{ "APPLAYER_PROTO_DETECTION_SKIPPED",
APPLAYER_PROTO_DETECTION_SKIPPED },
{ NULL,
-1 },
};
int AppLayerGetPktEventInfo(const char *event_name, int *event_id)
{
*event_id = SCMapEnumNameToValue(event_name, app_layer_event_pkt_table);
if (*event_id == -1) {
SCLogError(SC_ERR_INVALID_ENUM_MAP, "event \"%s\" not present in "
"app-layer-event's packet event table.", event_name);
/* this should be treated as fatal */
return -1;
}
return 0;
}
#define DECODER_EVENTS_BUFFER_STEPS 8
/**
* \brief Set an app layer decoder event.
*
* \param sevents Pointer to a AppLayerDecoderEvents pointer. If *sevents is NULL
* memory will be allocated.
* \param event The event to be stored.
*/
void AppLayerDecoderEventsSetEventRaw(AppLayerDecoderEvents **sevents, uint8_t event)
{
if (*sevents == NULL) {
AppLayerDecoderEvents *new_devents = SCMalloc(sizeof(AppLayerDecoderEvents));
if (new_devents == NULL)
return;
memset(new_devents, 0, sizeof(AppLayerDecoderEvents));
*sevents = new_devents;
}
if ((*sevents)->cnt == UCHAR_MAX) {
/* we're full */
return;
}
if ((*sevents)->cnt == (*sevents)->events_buffer_size) {
int steps = DECODER_EVENTS_BUFFER_STEPS;
if (UCHAR_MAX - (*sevents)->cnt < steps)
steps = UCHAR_MAX - (*sevents)->cnt < steps;
void *ptr = SCRealloc((*sevents)->events,
((*sevents)->cnt + steps) * sizeof(uint8_t));
if (ptr == NULL) {
/* couldn't grow buffer, but no reason to free old
* so we keep the events that may already be here */
return;
}
(*sevents)->events = ptr;
(*sevents)->events_buffer_size += steps;
}
(*sevents)->events[(*sevents)->cnt++] = event;
}
/**
* \brief Set an app layer decoder event.
*
* \param f Pointer to a flow containing DecoderEvents pointer head. If
* the head points to a DecoderEvents instance, a
* new instance would be created and the pointer head would
* would be updated with this new instance
* \param event The event to be stored.
*/
void AppLayerDecoderEventsSetEvent(Flow *f, uint8_t event)
{
AppLayerDecoderEvents *events = AppLayerParserGetDecoderEvents(f->alparser);
AppLayerDecoderEvents *new = events;
AppLayerDecoderEventsSetEventRaw(&events, event);
if (events != new)
AppLayerParserSetDecoderEvents(f->alparser, events);
}
void AppLayerDecoderEventsResetEvents(AppLayerDecoderEvents *events)
{
if (events != NULL)
events->cnt = 0;
}
void AppLayerDecoderEventsFreeEvents(AppLayerDecoderEvents **events)
{
if (events && *events != NULL) {
if ((*events)->events != NULL)
SCFree((*events)->events);
SCFree(*events);
*events = NULL;
}
}
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