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/* Copyright (C) 2019-2020 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.
*/
#include "suricata-common.h"
#include "detect.h"
#include "pkt-var.h"
#include "conf.h"
#include "threads.h"
#include "threadvars.h"
#include "tm-threads.h"
#include "util-unittest.h"
#include "util-buffer.h"
#include "util-debug.h"
#include "util-byte.h"
#include "output.h"
#include "output-json.h"
#include "app-layer.h"
#include "app-layer-parser.h"
#include "output-json-modbus.h"
#include "rust.h"
typedef struct LogModbusFileCtx_ {
LogFileCtx *file_ctx;
OutputJsonCtx *eve_ctx;
} LogModbusFileCtx;
typedef struct JsonModbusLogThread_ {
LogModbusFileCtx *modbuslog_ctx;
OutputJsonThreadCtx *ctx;
} JsonModbusLogThread;
static int JsonModbusLogger(ThreadVars *tv, void *thread_data, const Packet *p, Flow *f,
void *state, void *tx, uint64_t tx_id)
{
JsonModbusLogThread *thread = thread_data;
JsonBuilder *js =
CreateEveHeader(p, LOG_DIR_FLOW, "modbus", NULL, thread->modbuslog_ctx->eve_ctx);
if (unlikely(js == NULL)) {
return TM_ECODE_OK;
}
if (!rs_modbus_to_json(tx, js)) {
jb_free(js);
return TM_ECODE_FAILED;
}
OutputJsonBuilderBuffer(js, thread->ctx);
jb_free(js);
return TM_ECODE_OK;
}
static void OutputModbusLogDeInitCtxSub(OutputCtx *output_ctx)
{
LogModbusFileCtx *modbuslog_ctx = (LogModbusFileCtx *)output_ctx->data;
SCFree(modbuslog_ctx);
SCFree(output_ctx);
}
static OutputInitResult OutputModbusLogInitSub(ConfNode *conf, OutputCtx *parent_ctx)
{
OutputInitResult result = { NULL, false };
OutputJsonCtx *ajt = parent_ctx->data;
LogModbusFileCtx *modbuslog_ctx = SCCalloc(1, sizeof(*modbuslog_ctx));
if (unlikely(modbuslog_ctx == NULL)) {
return result;
}
modbuslog_ctx->file_ctx = ajt->file_ctx;
modbuslog_ctx->eve_ctx = ajt;
OutputCtx *output_ctx = SCCalloc(1, sizeof(*output_ctx));
if (unlikely(output_ctx == NULL)) {
SCFree(modbuslog_ctx);
return result;
}
output_ctx->data = modbuslog_ctx;
output_ctx->DeInit = OutputModbusLogDeInitCtxSub;
AppLayerParserRegisterLogger(IPPROTO_TCP, ALPROTO_MODBUS);
SCLogDebug("modbus log sub-module initialized.");
result.ctx = output_ctx;
result.ok = true;
return result;
}
static TmEcode JsonModbusLogThreadInit(ThreadVars *t, const void *initdata, void **data)
{
if (initdata == NULL) {
SCLogDebug("Error getting context for EveLogModbus. \"initdata\" is NULL.");
return TM_ECODE_FAILED;
}
JsonModbusLogThread *thread = SCCalloc(1, sizeof(*thread));
if (unlikely(thread == NULL)) {
return TM_ECODE_FAILED;
}
thread->modbuslog_ctx = ((OutputCtx *)initdata)->data;
thread->ctx = CreateEveThreadCtx(t, thread->modbuslog_ctx->eve_ctx);
if (thread->ctx == NULL) {
goto error_exit;
}
*data = (void *)thread;
return TM_ECODE_OK;
error_exit:
SCFree(thread);
return TM_ECODE_FAILED;
}
static TmEcode JsonModbusLogThreadDeinit(ThreadVars *t, void *data)
{
JsonModbusLogThread *thread = (JsonModbusLogThread *)data;
if (thread == NULL) {
return TM_ECODE_OK;
}
FreeEveThreadCtx(thread->ctx);
SCFree(thread);
return TM_ECODE_OK;
}
bool JsonModbusAddMetadata(const Flow *f, uint64_t tx_id, JsonBuilder *js)
{
void *state = FlowGetAppState(f);
if (state) {
void *tx = AppLayerParserGetTx(f->proto, ALPROTO_MODBUS, state, tx_id);
if (tx) {
return rs_modbus_to_json(tx, js);
}
}
return false;
}
void JsonModbusLogRegister(void)
{
/* Register as an eve sub-module. */
OutputRegisterTxSubModule(LOGGER_JSON_TX, "eve-log", "JsonModbusLog", "eve-log.modbus",
OutputModbusLogInitSub, ALPROTO_MODBUS, JsonModbusLogger, JsonModbusLogThreadInit,
JsonModbusLogThreadDeinit, NULL);
SCLogDebug("modbus json logger registered.");
}
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