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package com.it_jaros.network_scanner;
import java.io.IOException;
import java.net.*;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.List;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.LockSupport;
public class Scanner {
private final Counter counter = new Counter();
private final ProgressBar progressBar = new ProgressBar();
private final Semaphore socketLimit;
private final int timeoutInMillis;
private final long delayInNanos;
private final int maxWorkersPerHost;
private final int maxTargetsLimit;
public Scanner(int socketLimit, int timeoutInMillis, int delayInMillis, int maxWorkersPerHost, int maxTargetsLimit) {
this.timeoutInMillis = timeoutInMillis;
this.delayInNanos = TimeUnit.MILLISECONDS.toNanos(Math.max(0, delayInMillis));
this.socketLimit = new Semaphore(socketLimit);
this.maxWorkersPerHost = maxWorkersPerHost;
this.maxTargetsLimit = maxTargetsLimit;
}
public List<ScanResult> scan(ScanOptions target) {
return scanTargets(target.targets(), target.ports());
}
public List<ScanResult> scanTargets(List<String> targets, String ports) {
List<ScanResult> results = new ArrayList<>();
progressBar.start();
try (ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor()) {
List<Future<ScanResult>> futures = new ArrayList<>();
Semaphore maxTargets = new Semaphore(maxTargetsLimit);
for (String target : targets) {
maxTargets.acquireUninterruptibly();
futures.add(executor.submit(() -> {
try {
return scanTarget(target, ports);
} finally {
maxTargets.release();
}
}));
}
futures.forEach((Future<ScanResult> f) -> {
try {
results.add(f.get());
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} catch (ExecutionException e) {
System.out.printf("%s -> %s%n", e.getClass().getSimpleName(), e.getMessage());
}
});
}
progressBar.stop();
System.out.println("--------------------");
System.out.println("Finished scan!");
System.out.println("Stats:");
System.out.println("Peak concurrent connects: " + counter.max());
System.out.println("--------------------");
return results;
}
private ScanResult scanTarget(String target, String ports) {
PortRange portRange = new PortRange(ports);
AtomicLong portSlotFactory = new AtomicLong(System.nanoTime());
Semaphore maxWorkers = new Semaphore(maxWorkersPerHost);
BitSet openPorts = new BitSet(PortRange.MAX_PORT);
BitSet blockedPorts = new BitSet(PortRange.MAX_PORT);
Progress progress = new Progress(target, portRange.getTotal(), new AtomicInteger(), new AtomicInteger(), new AtomicInteger() );
progressBar.submit(progress);
try (ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor()) {
List<Future<PortResult>> futures = new ArrayList<>();
while (portRange.hasNext()) {
maxWorkers.acquireUninterruptibly();
final int currentPort = portRange.next();
futures.add(executor.submit(() -> {
try {
waitForSlot(portSlotFactory);
PortState state = getPortState(target, currentPort);
if (state.equals(PortState.OPEN)) {
progress.open().incrementAndGet();
} else if (state.equals(PortState.BLOCKED)) {
progress.blocked().incrementAndGet();
}
return new PortResult(currentPort, state);
} finally {
maxWorkers.release();
progress.done().incrementAndGet();
}
}));
}
List<Throwable> errors = new ArrayList<>();
for (Future<PortResult> f : futures) {
try {
// bitset is not thread-safe, so it is set
// outside the other virtual threads that update progress
PortResult portResult = f.get();
if (portResult.state().equals(PortState.OPEN)) {
openPorts.set(portResult.port());
} else if (portResult.state().equals(PortState.BLOCKED)) {
blockedPorts.set(portResult.port());
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} catch (ExecutionException e) {
errors.add(e);
}
}
if (!errors.isEmpty()) {
System.out.printf("Errors happened during scan of target %s%nErrors:%s -> %s", target, errors.size(), errors);
}
}
return new ScanResult(target, openPorts, blockedPorts);
}
private void waitForSlot(AtomicLong scanSlotFactory) {
if (delayInNanos > 0) {
long slot = scanSlotFactory.getAndAdd(delayInNanos);
long wait = slot - System.nanoTime();
if (wait > 0)
LockSupport.parkNanos(wait);
}
}
private PortState getPortState(String target, int port) {
socketLimit.acquireUninterruptibly();
counter.inc();
try (Socket socket = new Socket()) {
socket.connect(new InetSocketAddress(target, port), timeoutInMillis);
return PortState.OPEN;
} catch (NoRouteToHostException ignored) {
// this can be safely ignored because the port is closed if a host is unreachable
} catch (ConnectException ignored) {
return PortState.BLOCKED;
} catch (IOException ignored) {
// Will happen a lot when scanning for open ports, so not needed
} finally {
counter.dec();
socketLimit.release();
}
return PortState.CLOSED;
}
}
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