src/main/java/com/it_jaros/network_scanner/App.java


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package com.it_jaros.network_scanner;

import java.util.BitSet;
import java.util.List;
import java.util.stream.Collectors;

public class App {
    public static void main(String[] args) {
        CliParser cliParser = new CliParser();
        try {
            ScanOptions options = cliParser.parseArgs(args);
            Scanner scanner = new Scanner(options.openSocketLimit(), options.timeoutInMillis(),
                    options.delayInMillis(), options.maxWorkersPerHost(), options.maxTargetsLimit());
            printResults(scanner.scan(options));
        } catch (IllegalArgumentException e) {
            System.out.printf("Error while parsing arguments: %s", e.getMessage());
            cliParser.usageAndExit();
        } catch (Exception e) {
            System.out.printf("ERROR: %s", e.getMessage());
        }
    }

    public static void printResults(List<ScanResult> results) {
        results.forEach(App::printResult);
    }

    private static void printResult(ScanResult result) {
        if (result.openPorts().isEmpty() && result.blockedPorts().isEmpty()) {
            return;
        }

        System.out.println(result.target());
        if (!result.openPorts().isEmpty()) {
            System.out.println("\topen:\t" + map(result.openPorts()));
        }
        if (!result.blockedPorts().isEmpty()) {
            System.out.println("\tblocked:\t" + map(result.blockedPorts()));
        }
        System.out.println();
    }

    private static String map(BitSet ports) {
        return ports.stream().mapToObj(String::valueOf).collect(Collectors.joining(","));
    }
}