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package com.it_jaros.jscanner;
import java.util.BitSet;
import java.util.List;
import java.util.stream.Collectors;
public class App {
private static Thread shutdownHook;
public static void main(String[] args) {
CliParser cliParser = new CliParser();
try {
ScanOptions options = cliParser.parseArgs(args);
Scanner scanner = new Scanner(options);
addShutdownHook(scanner, options.showFilteredPorts());
printResults(scanner.scan(options), options.showFilteredPorts());
} catch (IllegalArgumentException e) {
System.out.printf("Error while parsing arguments: %s", e.getMessage());
System.out.println();
cliParser.usageAndExit();
} catch (Exception e) {
System.out.printf("ERROR: %s", e.getMessage());
} finally {
removeShutdownHook();
}
}
private static void addShutdownHook(Scanner scanner, boolean showFilteredPorts) {
shutdownHook = new Thread(() -> {
System.err.println("\nCtrl-C received.");
scanner.cancel();
});
Runtime.getRuntime().addShutdownHook(shutdownHook);
}
private static void removeShutdownHook() {
if (shutdownHook == null) {
return;
}
try {
Runtime.getRuntime().removeShutdownHook(shutdownHook);
} catch (IllegalStateException ignored) {
// JVM is already shutting down
}
}
public static void printResults(List<ScanResult> results, boolean showFilteredPorts) {
results.forEach((ScanResult r) -> printResult(r, showFilteredPorts));
}
private static void printResult(ScanResult result, boolean showFilteredPorts) {
if (result.openPorts().isEmpty() && (!showFilteredPorts || result.filteredPorts().isEmpty())) {
return;
}
System.out.println(result.host());
if (!result.openPorts().isEmpty()) {
System.out.printf("\t (%d) open:\t%s%n", result.openPorts().cardinality(), map(result.openPorts(), result.bannerRecognition()));
}
if (showFilteredPorts && !result.filteredPorts().isEmpty()) {
System.out.printf("\t (%d) filtered:\t%s%n", result.filteredPorts().cardinality(), map(result.filteredPorts()));
}
System.out.println();
}
private static String map(BitSet ports) {
return ports.stream().mapToObj(String::valueOf).collect(Collectors.joining(","));
}
private static String map(BitSet ports, java.util.HashMap<Integer, ServiceType> bannerRecognition) {
return ports.stream().mapToObj(port -> {
ServiceType serviceType = bannerRecognition.getOrDefault(port, ServiceType.UNKNOWN);
if (serviceType == ServiceType.UNKNOWN) {
return String.valueOf(port);
}
return port + "/" + serviceType.name().toLowerCase();
}).collect(Collectors.joining(","));
}
}
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