urmic_digital_encoder_decoder/encoder/firmware.php

<?php

include 'header.php';

switch ($_POST['action']) {
    case 'update':
        update_firmware();
        break;
    case 'reset':
        $files = glob('/var/www/html/*.json');
        foreach ($files as $file) {
            if (is_file($file) && basename($file) !== 'critical.json') {
                unlink($file);
            }
        }
        deleteDir('/var/www/encoder/setup');
        break;
    case 'reboot':
        exec('sudo reboot');
        break;
    case 'backup':

        $jsonFiles = [
            'input.json',
            'output.json',
            'firewall.json',
            'network.json',
            'firmware.json',
        ];

        $tmpZip = sys_get_temp_dir() . '/backup.zip';
        $outputFile = __DIR__ . '/universal_encoder_decoder.bin';

        $publicKey = file_get_contents('/var/www/public.pem');
        $publicKey = file_get_contents('/var/www/public.pem');

        $zip = new ZipArchive();
        $zip->open($tmpZip, ZipArchive::CREATE | ZipArchive::OVERWRITE);

        $files = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($sourceDir, FilesystemIterator::SKIP_DOTS)
        );

        foreach ($files as $file) {
            $zip->addFile(
                $file->getRealPath(),
                substr($file->getRealPath(), strlen($sourceDir) + 1)
            );
        }

        /* Add JSON files if exist */
        foreach ($jsonFiles as $json) {
            if (file_exists($json)) {
                $zip->addFile($json, basename($json));
            }
        }

        $zip->close();
        $data = file_get_contents($tmpZip);

        /* Generate AES key */
        $aesKey = random_bytes(32);
        $iv     = random_bytes(16);

        /* Encrypt ZIP */
        $encryptedData = openssl_encrypt(
            $data,
            'AES-256-CBC',
            $aesKey,
            OPENSSL_RAW_DATA,
            $iv
        );

        /* Encrypt AES key using RSA public key */
        openssl_public_encrypt($aesKey, $encryptedKey, $publicKey);

        /* Final binary format */
        $payload = json_encode([
            'key' => base64_encode($encryptedKey),
            'iv'  => base64_encode($iv),
            'data' => base64_encode($encryptedData)
        ]);

        $filename = 'universal_encoder_decoder.bin';

        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename="' . $filename . '"');
        header('Content-Length: ' . strlen($payload));
        header('Cache-Control: no-store, no-cache, must-revalidate');
        header('Pragma: no-cache');
        header('Expires: 0');

        echo $payload;
        flush();

        unlink($tmpZip);

        break;

    case 'restore':
        $inputFile  = __DIR__ . '/universal_encoder_decoder.bin';
        $restoreDir = __DIR__ . '/var/www/encoder/';
        $tmpZip     = sys_get_temp_dir() . '/restore.zip';

        $privateKey = file_get_contents(__DIR__ . '/keys/private.pem');

        if (!file_exists($inputFile)) {
            die("Backup file not found\n");
        }
        break;
}

$board_id = trim(@file_get_contents('/sys/class/dmi/id/board_serial'));

?>
<script>
    function confirmReboot() {
        return confirm("Are you sure you want to reboot?");
    }

    function confirmReset() {
        return confirm("All settings will be gone . Are you sure you want to reset ?");
    }

    function confirmUpdate() {
        return confirm("Newer version will be downloaded and installed Do not turn off power , this is irreversible are you sure to continue ? ");
    }

    function confirmbackup() {
        return confirm("Are you sure you want to download backup ? ");
    }
</script>


<div class="containerindex">
    <div class="grid">
        <div class="card wide">
            Device Licence Info :- <br>
            Device ID :- <?php global $board_id;
                            echo $board_id ?><br>
            Reseller ID :- <br>
            Project Name :- <br>
        </div>
        <div class="card wide">
            <form method="post" class="form-center" enctype="multipart/form-data"
                onsubmit="return confirm('Are you sure you want to restore using this file ? All settings will be restored as per backup file .')">

                <label>Select restore file (.bin only):</label><br><br>

                <input type="file"
                    name="shree_bhattji_encoder.bin"
                    accept=".bin"
                    required><br><br>

                <button type="submit" name="action" value="restore" class="green-btn">Restore</button>

            </form>
        </div>
        <div class="card wide">
            <form method="post" class="form-center">
                <button type="submit" name="action" value="backup" class="green-btn">Download Backup File</button>
            </form>
        </div>
        <div class="card wide">
            <form method="post" class="form-center" onsubmit="return confirmReboot();">
                <button type="submit" name="action" value="reboot" class="green-btn">Reboot</button>
            </form>
        </div>
        <div class="card wide">
            <form method="post" class="form-center" onsubmit="return confirmReset();">
                <button type="submit" name="action" value="reset" class="red-btn">Reset Settings</button>
            </form>
        </div>
        <div class="card wide">
            <form method="post" class="form-center" onsubmit="return confirmUpdate();">
                <button type="submit" name="action" value="update" class="red-btn">Update or Reset Firmware</button>
            </form>
        </div>
        <br>
    </div>
    <br>
</div>
<br><br>

<?php include 'footer.php'; ?>