From f5e5e45fec284192710ee95af4409ac572fc4127 Mon Sep 17 00:00:00 2001
From: Matthias Jaros <jarlucmat@mailbox.org>
Date: Thu, 2 Jul 2026 14:12:28 +0200
Subject: Finally i managed to print also intermediate results when stopping
 process from running with strg-c

---
 src/main/java/com/it_jaros/jscanner/App.java | 53 ++++++++++++++++++++--------
 1 file changed, 39 insertions(+), 14 deletions(-)

(limited to 'src/main/java/com/it_jaros/jscanner/App.java')

diff --git a/src/main/java/com/it_jaros/jscanner/App.java b/src/main/java/com/it_jaros/jscanner/App.java
index 119c42d..c021821 100644
--- a/src/main/java/com/it_jaros/jscanner/App.java
+++ b/src/main/java/com/it_jaros/jscanner/App.java
@@ -9,28 +9,41 @@ public class App {
     private static Thread shutdownHook;
 
     public static void main(String[] args) {
-        CliParser cliParser = new CliParser();
+        // just in case catch everything
+        try {
+            ScanOptions options = parseOptions(args);
+            if (options == null) return;
+            try (Scanner scanner = new Scanner(options)) {
+                Scan scan = scanner.createScan(options);
+                addShutdownHook(scan, scanner, options);
+                printScanResults(scanner.runScan(scan), scan.state(), options);
+            } finally {
+                removeShutdownHook();
+            }
+        } catch (Exception e) {
+            System.out.printf("ERROR: %s", e.getMessage());
+        }
+    }
+
 
+    private static ScanOptions parseOptions(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());
+            return cliParser.parseArgs(args);
         } 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();
         }
+
+        cliParser.usageAndExit(1);
+        return null;
     }
 
-    private static void addShutdownHook(Scanner scanner, boolean showFilteredPorts) {
+    private static void addShutdownHook(Scan scan, Scanner scanner, ScanOptions scanOptions) {
         shutdownHook = new Thread(() -> {
             System.err.println("\nCtrl-C received.");
             scanner.cancel();
+            printScanIntermediateResult(scan, scanOptions);
         });
         Runtime.getRuntime().addShutdownHook(shutdownHook);
     }
@@ -47,11 +60,23 @@ public class App {
         }
     }
 
-    public static void printResults(List<ScanResult> results, boolean showFilteredPorts) {
-        results.forEach((ScanResult r) -> printResult(r, showFilteredPorts));
+    public static void printScanIntermediateResult(Scan scan, ScanOptions scanOptions) {
+        printScanResults(scan.state().getSnapshotOfScanResults(), scan.state(), scanOptions);
+    }
+
+    private static void printScanResults(List<ScanResult> result, ScanState state, ScanOptions options) {
+        printStats(state);
+        result.forEach((ScanResult r) -> printPortsResults(r, options.showFilteredPorts()));
+    }
+
+    private static void printStats(ScanState state) {
+        System.out.println("--------------------");
+        System.out.println("Stats:");
+        System.out.println("Peak concurrent connects: " + state.getCounter().max());
+        System.out.println("--------------------");
     }
 
-    private static void printResult(ScanResult result, boolean showFilteredPorts) {
+    private static void printPortsResults(ScanResult result, boolean showFilteredPorts) {
         if (result.openPorts().isEmpty() && (!showFilteredPorts || result.filteredPorts().isEmpty())) {
             return;
         }
-- 
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