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package com.it_jaros.networkScanner;
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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