/* Copyright (C) 2020-2021 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 Sascha Steinbiss <sascha@steinbiss.name>

 */

#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 "app-layer-mqtt.h"

#include "output-json-mqtt.h"

#include "rust.h"

#define MQTT_LOG_PASSWORDS BIT_U32(0)

#define MQTT_DEFAULTS (MQTT_LOG_PASSWORDS)

typedef struct LogMQTTFileCtx_ {

    uint32_t    flags;

    OutputJsonCtx *eve_ctx;

} LogMQTTFileCtx;

typedef struct LogMQTTLogThread_ {

    LogMQTTFileCtx *mqttlog_ctx;

    uint32_t        count;

    OutputJsonThreadCtx *ctx;

} LogMQTTLogThread;

bool JsonMQTTAddMetadata(const Flow *f, uint64_t tx_id, JsonBuilder *js)

{

    MQTTState *state = FlowGetAppState(f);

    if (state) {

        MQTTTransaction *tx = AppLayerParserGetTx(f->proto, ALPROTO_MQTT, state, tx_id);

        if (tx) {

            return rs_mqtt_logger_log(tx, MQTT_DEFAULTS, js);

        }

    }

    return false;

}

static int JsonMQTTLogger(ThreadVars *tv, void *thread_data,

    const Packet *p, Flow *f, void *state, void *tx, uint64_t tx_id)

{

    LogMQTTLogThread *thread = thread_data;

    enum OutputJsonLogDirection dir;

    if (rs_mqtt_tx_is_toclient((MQTTTransaction*) tx)) {

        dir = LOG_DIR_FLOW_TOCLIENT;

    } else {

        dir = LOG_DIR_FLOW_TOSERVER;

    }

    JsonBuilder *js = CreateEveHeader(p, dir, "mqtt", NULL, thread->mqttlog_ctx->eve_ctx);

    if (unlikely(js == NULL)) {

        return TM_ECODE_FAILED;

    }

    if (!rs_mqtt_logger_log(tx, thread->mqttlog_ctx->flags, js))

        goto error;

    OutputJsonBuilderBuffer(js, thread->ctx);

    jb_free(js);

    return TM_ECODE_OK;

error:

    jb_free(js);

    return TM_ECODE_FAILED;

}

static void OutputMQTTLogDeInitCtxSub(OutputCtx *output_ctx)

{

    LogMQTTFileCtx *mqttlog_ctx = (LogMQTTFileCtx *)output_ctx->data;

    SCFree(mqttlog_ctx);

    SCFree(output_ctx);

}

static void JsonMQTTLogParseConfig(ConfNode *conf, LogMQTTFileCtx *mqttlog_ctx)

{

    const char *query = ConfNodeLookupChildValue(conf, "passwords");

    if (query != NULL) {

        if (ConfValIsTrue(query)) {

            mqttlog_ctx->flags |= MQTT_LOG_PASSWORDS;

        } else {

            mqttlog_ctx->flags &= ~MQTT_LOG_PASSWORDS;

        }

    } else {

        mqttlog_ctx->flags |= MQTT_LOG_PASSWORDS;

    }

}

static OutputInitResult OutputMQTTLogInitSub(ConfNode *conf,

    OutputCtx *parent_ctx)

{

    OutputInitResult result = { NULL, false };

    OutputJsonCtx *ajt = parent_ctx->data;

    LogMQTTFileCtx *mqttlog_ctx = SCCalloc(1, sizeof(*mqttlog_ctx));

    if (unlikely(mqttlog_ctx == NULL)) {

        return result;

    }

    mqttlog_ctx->eve_ctx = ajt;

    OutputCtx *output_ctx = SCCalloc(1, sizeof(*output_ctx));

    if (unlikely(output_ctx == NULL)) {

        SCFree(mqttlog_ctx);

        return result;

    }

    output_ctx->data = mqttlog_ctx;

    output_ctx->DeInit = OutputMQTTLogDeInitCtxSub;

    JsonMQTTLogParseConfig(conf, mqttlog_ctx);

    AppLayerParserRegisterLogger(IPPROTO_TCP, ALPROTO_MQTT);

    result.ctx = output_ctx;

    result.ok = true;

    return result;

}

static TmEcode JsonMQTTLogThreadInit(ThreadVars *t, const void *initdata, void **data)

{

    LogMQTTLogThread *thread = SCCalloc(1, sizeof(*thread));

    if (unlikely(thread == NULL)) {

        return TM_ECODE_FAILED;

    }

    if (initdata == NULL) {

        SCLogDebug("Error getting context for EveLogMQTT.  \"initdata\" is NULL.");

        SCFree(thread);

        return TM_ECODE_FAILED;

    }

    thread->mqttlog_ctx = ((OutputCtx *)initdata)->data;

    thread->ctx = CreateEveThreadCtx(t, thread->mqttlog_ctx->eve_ctx);

    if (unlikely(thread->ctx == NULL)) {

        SCFree(thread);

        return TM_ECODE_FAILED;

    }

    *data = (void *)thread;

    return TM_ECODE_OK;

}

static TmEcode JsonMQTTLogThreadDeinit(ThreadVars *t, void *data)

{

    LogMQTTLogThread *thread = (LogMQTTLogThread *)data;

    if (thread == NULL) {

        return TM_ECODE_OK;

    }

    FreeEveThreadCtx(thread->ctx);

    SCFree(thread);

    return TM_ECODE_OK;

}

void JsonMQTTLogRegister(void)

{

    OutputRegisterTxSubModule(LOGGER_JSON_TX, "eve-log", "JsonMQTTLog", "eve-log.mqtt",

            OutputMQTTLogInitSub, ALPROTO_MQTT, JsonMQTTLogger, JsonMQTTLogThreadInit,

            JsonMQTTLogThreadDeinit, NULL);

}