From 7946b8aae3427b180d28441f8a02ae6665ac215c Mon Sep 17 00:00:00 2001
From: Matthias Jaros <jarlucmat@mailbox.org>
Date: Mon, 16 Mar 2026 16:41:25 +0100
Subject: Renamed package

---
 .../com/it_jaros/network_scanner/CliParser.java    | 80 ++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 src/main/java/com/it_jaros/network_scanner/CliParser.java

(limited to 'src/main/java/com/it_jaros/network_scanner/CliParser.java')

diff --git a/src/main/java/com/it_jaros/network_scanner/CliParser.java b/src/main/java/com/it_jaros/network_scanner/CliParser.java
new file mode 100644
index 0000000..84fa8dc
--- /dev/null
+++ b/src/main/java/com/it_jaros/network_scanner/CliParser.java
@@ -0,0 +1,80 @@
+package com.it_jaros.network_scanner;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class CliParser {
+    
+    public ScanOptions parseArgs(String[] args) {
+        if (args.length < 1 || args[0].trim().equals("")) {
+            throw new IllegalArgumentException("No argument given");
+        }
+        
+        Set<String> targets = new HashSet<>();
+        int socketLimit = 1000;
+        int delayInMillis = 0;
+        int timeoutInMillis = 1000;
+        int maxWorkersPerHost = 1000;
+        String ports = "1-1024";
+        for (int i = 0; i < args.length; i++) {
+            final String currentArg = args[i];
+            if (!currentArg.startsWith("-")) {
+                targets.add(currentArg);
+                continue;
+            }
+
+            try {
+                switch (currentArg) {
+                    case "--help", "-h":
+                        usageAndExit();
+                        break;
+                    case "--socketLimit", "-sl":
+                        socketLimit = Integer.parseInt(args[++i]);
+                        break;
+                    case "--delay", "-d":
+                        delayInMillis = Integer.parseInt(args[++i]);
+                        break;
+                    case "--timeout", "-t":
+                        timeoutInMillis = Integer.parseInt(args[++i]);
+                        break;
+                    case "--maxWorkersPerHost", "-wh":
+                        maxWorkersPerHost = Integer.parseInt(args[++i]);
+                        break;
+                    case "--ports", "-p":
+                        ports = args[++i];
+                        break;
+                    default:
+                        throw new IllegalArgumentException("No such param " + currentArg);
+                }
+            } catch (IndexOutOfBoundsException | NumberFormatException e) {
+                System.out.printf("Missing or wrong argument for option %s", currentArg);
+                System.exit(2);
+            }
+        }
+
+        System.out.printf(
+                "Parsed arguments: targets('%s'), ports(%s), socketLimit(%s), delayInMillis(%s), timeoutInMillis(%s), maxWorkersPerHost(%s)%n",
+                targets, ports, socketLimit, delayInMillis, timeoutInMillis, maxWorkersPerHost);
+        
+        return new ScanOptions(targets.stream().toList(), socketLimit, delayInMillis, timeoutInMillis, maxWorkersPerHost, ports);
+    }
+
+    public void usageAndExit() {
+        System.err.println("""
+                Usage:
+                    java -jar scanner.jar [OPTIONS] <host>
+
+                Options:
+                    --delay, -d: Waiting period in millis for connection attempts for a host; (Default: 0)
+                    --socketLimit, -sl: Socket Connection limit for a host; (Default: 1000)
+                    --timeout, -t: Timeout per connection attempt, 0 means infinite: (Default: 1000)
+                    --ports, -p: Ports to be scanned
+                    --maxWorkersPerHost, -wh: Virtual Worker Threads run per target. Higher doesn't mean necessarily faster. But the more you use the more RAM is required. (Default: 1000)
+
+                Examples:
+                    java -jar scanner.jar localhost
+                    java -jar scanner.jar fd00::1
+                """);
+        System.exit(1);
+    }
+}
-- 
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