1 files changed, 112 insertions, 0 deletions
diff --git a/src/main/java/com/it_jaros/jscanner/CliParser.java b/src/main/java/com/it_jaros/jscanner/CliParser.java
new file mode 100644
index 0000000..1ab6b22
--- /dev/null
+++ b/src/main/java/com/it_jaros/jscanner/CliParser.java
@@ -0,0 +1,112 @@
+package com.it_jaros.jscanner;
+
+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> hostsArgv = new HashSet<>();
+        int socketLimit = CliDefaults.SOCKET_LIMIT;
+        int delayInMillis = CliDefaults.DELAY_IN_MILLIS;
+        int timeoutInMillis = CliDefaults.TIMEOUT_IN_MILLIS;
+        int maxWorkersPerHost = CliDefaults.MAX_WORKERS_PER_HOST;
+        int maxHostsLimit = CliDefaults.MAX_HOSTS_LIMIT;
+        String ports = CliDefaults.PORTS;
+        boolean showFilteredPorts = CliDefaults.SHOW_FILTERED_PORTS;
+        boolean disableHostCheck = CliDefaults.DISABLE_HOST_CHECK;
+        String hostsFile = null;
+
+        for (int i = 0; i < args.length; i++) {
+            final String currentArg = args[i];
+            if (!currentArg.startsWith("-")) {
+                hostsArgv.add(currentArg);
+                continue;
+            }
+
+            switch (currentArg) {
+                case "--help", "-h":
+                    usageAndExit();
+                    break;
+                case "--socketLimit", "-sl":
+                    socketLimit = parseIntOption(args, ++i, currentArg);
+                    break;
+                case "--delay", "-d":
+                    delayInMillis = parseIntOption(args, ++i, currentArg);
+                    break;
+                case "--timeout", "-t":
+                    timeoutInMillis = parseIntOption(args, ++i, currentArg);
+                    break;
+                case "--maxWorkersPerHost", "-wh":
+                    maxWorkersPerHost = parseIntOption(args, ++i, currentArg);
+                    break;
+                case "--maxHostsLimit", "-tl":
+                    maxHostsLimit = parseIntOption(args, ++i, currentArg);
+                    break;
+                case "--ports", "-p":
+                    ports = requireValue(args, ++i, currentArg);
+                    break;
+                case "--showFilteredPorts", "-sf":
+                    showFilteredPorts = true;
+                    break;
+                case "--disableHostCheck", "-dt":
+                    disableHostCheck = true;
+                    break;
+                case "--file", "-f":
+                    hostsFile = requireValue(args, ++i, currentArg);
+                    break;
+                default:
+                    throw new IllegalArgumentException("No such param " + currentArg);
+            }
+        }
+
+        System.out.printf(
+                "Parsed arguments: hostsArgv('%s'), ports(%s), socketLimit(%s), delayInMillis(%s), timeoutInMillis(%s), maxWorkersPerHost(%s), maxTargetsLimit(%s), showFilteredPorts(%s), disableTargetCheck(%s), file(%s) %n",
+                hostsArgv, ports, socketLimit, delayInMillis, timeoutInMillis, maxWorkersPerHost, maxHostsLimit, showFilteredPorts, disableHostCheck, hostsFile);
+
+        return new ScanOptions(hostsArgv.stream().toList(), socketLimit, delayInMillis, timeoutInMillis, maxWorkersPerHost, maxHostsLimit, ports, showFilteredPorts, disableHostCheck, hostsFile);
+    }
+
+    private String requireValue(String[] args, int index, String option) {
+        if (index >= args.length) {
+            throw new IllegalArgumentException(String.format("Missing argument for option %s", option));
+        }
+        return args[index];
+    }
+
+    private int parseIntOption(String[] args, int index, String option) {
+        String value = requireValue(args, index, option);
+        try {
+            return Integer.parseInt(value);
+        } catch (NumberFormatException e) {
+            throw new IllegalArgumentException(String.format("Invalid argument %s for option %s", value, option));
+        }
+    }
+
+    public void usageAndExit() {
+        System.err.println("""
+                Usage:
+                    java -jar scanner.jar [OPTIONS] <host>
+
+                Options:
+                    --delay, -d:\t\tWaiting period in millis for connection attempts for a host (Default: 0)
+                    --socketLimit, -sl:\t\tSocket Connection limit for a host (Default: 1000)
+                    --timeout, -t:\t\tTimeout per connection attempt, 0 means infinite (Default: 1000)
+                    --ports, -p:\t\tPorts to be scanned
+                    --maxWorkersPerHost, -wh:\tVirtual Worker Threads run per Host. Higher doesn't mean necessarily faster. But the more you use the more RAM is required (Default: 1000)
+                    --maxHostsLimit, -tl:\tMax number of Hosts that are scanned at the same time (Default: 10)
+                    --showFilteredPorts, -sf:\tShow also filtered ports
+                    --disableHostCheck, -dt:\tDon't check if Host is reachable
+                    --file, -f:\t\t\tRead hosts to scan from file instead of stdin
+
+                Examples:
+                    java -jar scanner.jar localhost
+                    java -jar scanner.jar fd00::1
+                """);
+        System.exit(1);
+    }
+}