/* Copyright (C) 2025 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 "conf.h"

#include "threadvars.h"

#include "util-debug.h"

#include "app-layer-parser.h"

#include "output.h"

#include "output-json.h"

#include "output-json-mdns.h"

#include "rust.h"

typedef struct SCDnsLogFileCtx_ {

    uint64_t flags; /** Store mode */

    OutputJsonCtx *eve_ctx;

    uint8_t version;

} SCDnsLogFileCtx;

typedef struct SCDnsLogThread_ {

    SCDnsLogFileCtx *dnslog_ctx;

    OutputJsonThreadCtx *ctx;

} SCDnsLogThread;

bool AlertJsonMdns(void *txptr, SCJsonBuilder *js)

{

    return SCMdnsLogJson(txptr, js);

}

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

        void *alstate, void *txptr, uint64_t tx_id)

{

    SCDnsLogThread *td = (SCDnsLogThread *)thread_data;

    SCDnsLogFileCtx *dnslog_ctx = td->dnslog_ctx;

    SCJsonBuilder *jb = CreateEveHeader(p, LOG_DIR_FLOW, "mdns", NULL, dnslog_ctx->eve_ctx);

    if (unlikely(jb == NULL)) {

        return TM_ECODE_OK;

    }

    if (SCMdnsLogJson(txptr, jb)) {

        OutputJsonBuilderBuffer(tv, p, p->flow, jb, td->ctx);

    }

    SCJbFree(jb);

    return TM_ECODE_OK;

}

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

{

    SCDnsLogThread *aft = SCCalloc(1, sizeof(SCDnsLogThread));

    if (unlikely(aft == NULL))

        return TM_ECODE_FAILED;

    if (initdata == NULL) {

        SCLogDebug("Error getting log context for eve-log.mdns.  \"initdata\" argument NULL");

        goto error_exit;

    }

    /* Use the Output Context (file pointer and mutex) */

    aft->dnslog_ctx = ((OutputCtx *)initdata)->data;

    aft->ctx = CreateEveThreadCtx(t, aft->dnslog_ctx->eve_ctx);

    if (!aft->ctx) {

        goto error_exit;

    }

    *data = (void *)aft;

    return TM_ECODE_OK;

error_exit:

    SCFree(aft);

    return TM_ECODE_FAILED;

}

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

{

    SCDnsLogThread *aft = (SCDnsLogThread *)data;

    if (aft == NULL) {

        return TM_ECODE_OK;

    }

    FreeEveThreadCtx(aft->ctx);

    /* clear memory */

    memset(aft, 0, sizeof(SCDnsLogThread));

    SCFree(aft);

    return TM_ECODE_OK;

}

static void DnsLogDeInitCtxSub(OutputCtx *output_ctx)

{

    SCDnsLogFileCtx *dnslog_ctx = (SCDnsLogFileCtx *)output_ctx->data;

    SCFree(dnslog_ctx);

    SCFree(output_ctx);

}

static OutputInitResult DnsLogInitCtxSub(SCConfNode *conf, OutputCtx *parent_ctx)

{

    OutputInitResult result = { NULL, false };

    const char *enabled = SCConfNodeLookupChildValue(conf, "enabled");

    if (enabled != NULL && !SCConfValIsTrue(enabled)) {

        result.ok = true;

        return result;

    }

    OutputJsonCtx *ojc = parent_ctx->data;

    SCDnsLogFileCtx *dnslog_ctx = SCCalloc(1, sizeof(SCDnsLogFileCtx));

    if (unlikely(dnslog_ctx == NULL)) {

        return result;

    }

    dnslog_ctx->eve_ctx = ojc;

    dnslog_ctx->version = DNS_LOG_VERSION_3;

    /* For mDNS, log everything.

     *

     * TODO: Maybe add flags for request and/or response only.

     */

    dnslog_ctx->flags = ~0ULL;

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

    if (unlikely(output_ctx == NULL)) {

        SCFree(dnslog_ctx);

        return result;

    }

    output_ctx->data = dnslog_ctx;

    output_ctx->DeInit = DnsLogDeInitCtxSub;

    SCAppLayerParserRegisterLogger(IPPROTO_UDP, ALPROTO_MDNS);

    result.ctx = output_ctx;

    result.ok = true;

    return result;

}

void JsonMdnsLogRegister(void)

{

    OutputRegisterTxSubModule(LOGGER_JSON_TX, "eve-log", "JsonMdnsLog", "eve-log.mdns",

            DnsLogInitCtxSub, ALPROTO_MDNS, JsonMdnsLogger, SCDnsLogThreadInit,

            SCDnsLogThreadDeinit);

}