// Copyright (C) 2024-2025 Internet Systems Consortium, Inc. ("ISC")

//

// This Source Code Form is subject to the terms of the Mozilla Public

// License, v. 2.0. If a copy of the MPL was not distributed with this

// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include <config.h>

#include <fuzz.h>

#include <log/logger_support.h>

#include <process/daemon.h>

#include <util/filesystem.h>

#include <util/encode/encode.h>

#include <cassert>

#include <string>

using namespace isc::process;

using namespace isc::util::encode;

using namespace isc::util::file;

using namespace std;

string KEA_FUZZ_DIR() {

    static TemporaryDirectory TEMP_DIR = TemporaryDirectory();

    return TEMP_DIR.dirName();

}

extern "C" {

bool

DoInitialization() {

    LLVMFuzzerTearDown();

    // Spoof the logger just enough to not get LoggingNotInitialized thrown.

    // We explicitly don't want any logging during fuzzing for performance reasons.

    setenv("KEA_LOCKFILE_DIR", KEA_FUZZ_DIR().c_str(), 0);

    setenv("KEA_LFC_EXECUTABLE", "/bin/true", 0);

    if (!getenv("DEBUG")) {

        setenv("KEA_LOGGER_DESTINATION", "/dev/null", 0);

    }

    setenv("KEA_PIDFILE_DIR", KEA_FUZZ_DIR().c_str(), 0);

    if (!isc::log::isLoggingInitialized()) {

        isc::log::initLogger("fuzzer");

        Daemon::loggerInit("fuzzer", /* verbose = */ false);

        Daemon::setDefaultLoggerName("fuzzer");

    }

    return true;

}

void writeToFile(string const& file, string const& content) {

    // Create the config file.

    ofstream out(file, ios::out | ios::trunc);

    assert(out.is_open());

    out << content;

    out.close();

    assert(!out.is_open());

}

bool byteStreamToPacketData(uint8_t const* data, size_t size, vector<uint8_t>& byte_stream) {

    string str(data, data + size);

    if (!str.empty() && str.at(str.size() - 1) == '\n') {

        str = str.substr(0, str.size() - 1);

    }

    if (str.find_first_not_of("0123456789abcdefABCDEF") != string::npos) {

        return false;

    }

    if (str.size() % 2) {

        return false;

    }

    decodeHex(str, byte_stream);

    return true;

}

}  // extern "C"