/* Copyright (C) 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

 *

 * Implements JSON/eve logging for Quic app-layer.

 */

#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-ssl.h"

#include "app-layer-parser.h"

#include "output-json-quic.h"

#include "rust.h"

typedef struct LogQuicFileCtx_ {

    LogFileCtx *file_ctx;

    OutputJsonCtx *eve_ctx;

    bool log_ja4;

} LogQuicFileCtx;

typedef struct JsonQuicLogThread_ {

    LogQuicFileCtx *quiclog_ctx;

    OutputJsonThreadCtx *ctx;

} JsonQuicLogThread;

static int JsonQuicLogger(ThreadVars *tv, void *thread_data, const Packet *p, Flow *f, void *state,

        void *tx, uint64_t tx_id)

{

    JsonQuicLogThread *thread = thread_data;

    JsonBuilder *js =

            CreateEveHeader(p, LOG_DIR_PACKET, "quic", NULL, thread->quiclog_ctx->eve_ctx);

    if (unlikely(js == NULL)) {

        return TM_ECODE_OK;

    }

    LogQuicFileCtx *quic_ctx = thread->quiclog_ctx;

    if (!rs_quic_to_json(tx, quic_ctx->log_ja4, js)) {

        jb_free(js);

        return TM_ECODE_FAILED;

    }

    OutputJsonBuilderBuffer(js, thread->ctx);

    jb_free(js);

    return TM_ECODE_OK;

}

static void OutputQuicLogDeInitCtxSub(OutputCtx *output_ctx)

{

    LogQuicFileCtx *quiclog_ctx = (LogQuicFileCtx *)output_ctx->data;

    SCFree(quiclog_ctx);

    SCFree(output_ctx);

}

static OutputInitResult OutputQuicLogInitSub(ConfNode *conf, OutputCtx *parent_ctx)

{

    OutputInitResult result = { NULL, false };

    OutputJsonCtx *ajt = parent_ctx->data;

    LogQuicFileCtx *quiclog_ctx = SCCalloc(1, sizeof(*quiclog_ctx));

    if (unlikely(quiclog_ctx == NULL)) {

        return result;

    }

    quiclog_ctx->file_ctx = ajt->file_ctx;

    quiclog_ctx->eve_ctx = ajt;

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

    if (unlikely(output_ctx == NULL)) {

        SCFree(quiclog_ctx);

        return result;

    }

    /* In 7.0.x, ja4 hash is only logged when requested */

    quiclog_ctx->log_ja4 = false;

    const char *ja4 = ConfNodeLookupChildValue(conf, "ja4");

    if (ja4 && ConfValIsTrue(ja4)) {

        quiclog_ctx->log_ja4 = true;

    }

    output_ctx->data = quiclog_ctx;

    output_ctx->DeInit = OutputQuicLogDeInitCtxSub;

    AppLayerParserRegisterLogger(IPPROTO_UDP, ALPROTO_QUIC);

    result.ctx = output_ctx;

    result.ok = true;

    return result;

}

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

{

    if (initdata == NULL) {

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

        return TM_ECODE_FAILED;

    }

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

    if (unlikely(thread == NULL)) {

        return TM_ECODE_FAILED;

    }

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

    thread->ctx = CreateEveThreadCtx(t, thread->quiclog_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 JsonQuicLogThreadDeinit(ThreadVars *t, void *data)

{

    JsonQuicLogThread *thread = (JsonQuicLogThread *)data;

    if (thread == NULL) {

        return TM_ECODE_OK;

    }

    FreeEveThreadCtx(thread->ctx);

    SCFree(thread);

    return TM_ECODE_OK;

}

bool JsonQuicAddMetadata(const Flow *f, const uint32_t sig_flags, uint64_t tx_id, JsonBuilder *js)

{

    void *state = FlowGetAppState(f);

    if (state) {

        void *tx = AppLayerParserGetTx(f->proto, ALPROTO_QUIC, state, tx_id);

        if (tx) {

            return rs_quic_to_json(tx, sig_flags & SIG_FLAG_JA4, js);

        }

    }

    return false;

}

void JsonQuicLogRegister(void)

{

    /* Register as an eve sub-module. */

    OutputRegisterTxSubModule(LOGGER_JSON_TX, "eve-log", "JsonQuicLog", "eve-log.quic",

            OutputQuicLogInitSub, ALPROTO_QUIC, JsonQuicLogger, JsonQuicLogThreadInit,

            JsonQuicLogThreadDeinit, NULL);

    SCLogDebug("quic json logger registered.");

}