/*

 * Copyright (c) 2025, Net-snmp authors

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * * Redistributions of source code must retain the above copyright notice, this

 *   list of conditions and the following disclaimer.

 *

 * * Redistributions in binary form must reproduce the above copyright notice,

 *   this list of conditions and the following disclaimer in the documentation

 *   and/or other materials provided with the distribution.

 *

 * * Neither the name of the copyright holder nor the names of its

 *   contributors may be used to endorse or promote products derived from

 *   this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include <net-snmp/net-snmp-config.h>

#include <net-snmp/net-snmp-includes.h>

#include "../../apps/snmptrapd_handlers.h"

#include "ada_fuzz_header.h"

int LLVMFuzzerInitialize(int *argc, char ***argv) {

    if (getenv("NETSNMP_DEBUGGING") != NULL) {

        /*

         * Turn on all debugging, to help understand what

         * bits of the parser are running.

         */

        snmp_enable_stderrlog();

        snmp_set_do_debugging(1);

        debug_register_tokens("");

    }

    return 0;

}

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

    oid snmpTrapOid[] = { 1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0 };

    netsnmp_variable_list var2 = {

        .name = snmpTrapOid,

        .name_length = sizeof(snmpTrapOid) / sizeof(snmpTrapOid[0])

    };

    netsnmp_variable_list var1 = { .next_variable = &var2 };

    netsnmp_transport transport = { };

    netsnmp_session sess = { };

    netsnmp_pdu *pdu;

    int op;

    af_gb_init();

    var2.val_len = af_get_short(&data, &size);

    var2.val.objid = af_gb_get_random_data(&data, &size, var2.val_len);

    if (!var2.val.objid)

        goto cleanup;

    op = NETSNMP_CALLBACK_OP_RECEIVED_MESSAGE;

    pdu = af_gb_get_random_data(&data, &size, sizeof(*pdu));

    if (!pdu)

        goto cleanup;

    pdu->enterprise_length = af_get_short(&data, &size);

    pdu->enterprise = af_gb_get_random_data(&data, &size,

                                            pdu->enterprise_length *

                                            sizeof(pdu->enterprise[0]));

    if (!pdu->enterprise)

        goto cleanup;

    pdu->community = NULL;

    pdu->community_len = 0;

    pdu->contextEngineID = NULL;

    pdu->contextEngineIDLen = 0;

    pdu->securityEngineID = NULL;

    pdu->securityEngineIDLen = 0;

    pdu->contextName = NULL;

    pdu->contextNameLen = 0;

    pdu->securityName = NULL;

    pdu->securityNameLen = 0;

    pdu->transport_data = NULL;

    pdu->transport_data_length = 0;

    pdu->variables = &var1;

    snmp_input(op, &sess, 0/*ignored*/, pdu, &transport);

cleanup:

    af_gb_cleanup();

    return 0;

}