jscanner

commit bce8b404b5f9d4f3016b9e6b67633ea99523fc44
parent fe3162771744e9a21970f089d0fe52cef86a758e
Author: Matthias Jaros <jaros@mailbox.org>
Date:   Mon, 26 Jan 2026 18:28:17 +0100

Added progress bar :-)

Diffstat:
A
src/main/java/com/it_jaros/networkScanner/Progress.java
 | 
6
++++++
A
src/main/java/com/it_jaros/networkScanner/ProgressBar.java
 | 
47
+++++++++++++++++++++++++++++++++++++++++++++++
M
src/main/java/com/it_jaros/networkScanner/Scanner.java
 | 
20
++++++++++++++++----

3 files changed, 69 insertions(+), 4 deletions(-)
diff --git a/src/main/java/com/it_jaros/networkScanner/Progress.java b/src/main/java/com/it_jaros/networkScanner/Progress.java
@@ -0,0 +1,5 @@
+package com.it_jaros.networkScanner;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+record Progress(String host, int total, AtomicInteger done, AtomicInteger open) {}
+\ No newline at end of file
diff --git a/src/main/java/com/it_jaros/networkScanner/ProgressBar.java b/src/main/java/com/it_jaros/networkScanner/ProgressBar.java
@@ -0,0 +1,47 @@
+package com.it_jaros.networkScanner;
+
+import java.util.List;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+public class ProgressBar {
+
+    private ScheduledExecutorService ui = Executors.newSingleThreadScheduledExecutor();
+
+    public void start(List<Progress> hosts) {
+        final int lines = hosts.size();
+        System.out.print("\n\n");
+        ui.scheduleAtFixedRate(() -> {
+            // move cursor UP to where bars start
+            System.out.print("\u001b[" + lines + "A");
+
+            for (Progress progress : hosts) {
+                System.out.print("\u001b[2K\r");
+                System.out.println(bar(
+                        progress.host() + " open=" + progress.open().get(),
+                        progress.done().get(),
+                        progress.total()));
+            }
+        }, 1, 200, TimeUnit.MILLISECONDS);
+    }
+
+    public void stop() {
+        ui.shutdown();
+    }
+
+    public String bar(String label, int done, int total) {
+        int width = 30;
+        double pct = total == 0 ? 1.0 : (done / (double) total);
+        int filled = (int) (pct * width);
+
+        String b = "[" + "#".repeat(filled) + "-".repeat(width - filled) + "]";
+        int percent = (int) (pct * 100);
+
+        return String.format("%-25s %s %3d%% (%d/%d)", label, b, percent, done, total);
+    }
+
+    void onPortFinished(Progress p) {
+        p.done().incrementAndGet();
+    }
+}
diff --git a/src/main/java/com/it_jaros/networkScanner/Scanner.java b/src/main/java/com/it_jaros/networkScanner/Scanner.java
@@ -13,12 +13,14 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Semaphore;
 import java.util.concurrent.TimeUnit;
+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 socketCap;
     private final int timeoutInMillis;
     
@@ -38,22 +40,32 @@ public class Scanner {
     public List<ScanResult> scanPorts(List<String> targets, int delayInMillis) {
         List<ScanResult> results = new ArrayList<>();
         long delayInNanos = TimeUnit.MILLISECONDS.toNanos(Math.max(0, delayInMillis));
-        try (ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor()) {
+        try (ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor();) {
+            List<Progress> hosts = new ArrayList<>();
             for (String target : targets) {
-                results.add(scanTargetAsync(target, delayInNanos, executor));
+                Progress progress = new Progress(target, 65535, new AtomicInteger(), new AtomicInteger());
+                hosts.add(progress);
+                results.add(scanTargetAsync(target, delayInNanos, executor, progress));
             }
+            progressBar.start(hosts);
         }
+
+        progressBar.stop();
         System.out.println("Peak concurrent connects: " + counter.max());
         return results;
     }
 
-    private ScanResult scanTargetAsync(String target, long delayInNanos, ExecutorService executor) { 
+    private ScanResult scanTargetAsync(String target, long delayInNanos, ExecutorService executor, Progress p) {
         AtomicLong nextStartNanos = new AtomicLong(System.nanoTime());
         Queue<Integer> openPorts = new ConcurrentLinkedQueue<>();
         for (int port = 1; port < 65536; port++) {
             final int currentPort = port;
             executor.submit(() -> {
-                scanPortsAsync(target, delayInNanos, nextStartNanos, openPorts, currentPort);
+                try {
+                    scanPortsAsync(target, delayInNanos, nextStartNanos, openPorts, currentPort);
+                } finally {
+                    progressBar.onPortFinished(p);
+                }
             });
         }
         return new ScanResult(target, openPorts);