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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> targetHosts = 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 file = null;
for (int i = 0; i < args.length; i++) {
final String currentArg = args[i];
if (!currentArg.startsWith("-")) {
targetHosts.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":
file = requireValue(args, ++i, currentArg);
break;
default:
throw new IllegalArgumentException("No such param " + currentArg);
}
}
System.out.printf(
"Parsed arguments: targetHosts('%s'), ports(%s), socketLimit(%s), delayInMillis(%s), timeoutInMillis(%s), maxWorkersPerHost(%s), maxTargetsLimit(%s), showFilteredPorts(%s), disableTargetCheck(%s), file(%s) %n",
targetHosts, ports, socketLimit, delayInMillis, timeoutInMillis, maxWorkersPerHost, maxHostsLimit, showFilteredPorts, disableHostCheck, file);
return new ScanOptions(targetHosts.stream().toList(), socketLimit, delayInMillis, timeoutInMillis, maxWorkersPerHost, maxHostsLimit, ports, showFilteredPorts, disableHostCheck, file);
}
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
Examples:
java -jar scanner.jar localhost
java -jar scanner.jar fd00::1
""");
System.exit(1);
}
}
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