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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().isEmpty()) {
throw new IllegalArgumentException("No argument given");
}
Set<String> hostsArgv = new HashSet<>();
String hostsFile = null;
String ports = CliDefaults.PORTS;
boolean bannerRecognition = CliDefaults.BANNER_RECOGNITION;
boolean disableOnlineCheck = CliDefaults.DISABLE_HOST_CHECK;
boolean quiet = CliDefaults.QUIET;
boolean showFilteredPorts = CliDefaults.SHOW_FILTERED_PORTS;
int delayInMillis = CliDefaults.DELAY_IN_MILLIS;
int hostsLimit = CliDefaults.MAX_HOSTS_LIMIT;
int workersPerHostLimit = CliDefaults.MAX_WORKERS_PER_HOST;
int socketLimit = CliDefaults.SOCKET_LIMIT;
int timeoutInMillis = CliDefaults.TIMEOUT_IN_MILLIS;
for (int i = 0; i < args.length; i++) {
final String currentArg = args[i];
if (!currentArg.startsWith("-")) {
hostsArgv.add(currentArg);
continue;
}
switch (currentArg) {
case "--bannerRecognition", "-b":
bannerRecognition = true;
break;
case "--delay", "-d":
delayInMillis = parseIntOption(args, ++i, currentArg);
break;
case "--disableOnlineCheck", "-do":
disableOnlineCheck = true;
break;
case "--help", "-h":
printUsageHelp();
throw new HelpRequested();
case "--input", "-i":
hostsFile = getArgument(args, ++i, currentArg);
break;
case "--hostsLimit", "-hl":
hostsLimit = parseIntOption(args, ++i, currentArg);
break;
case "--workersPerHostLimit", "-whl":
workersPerHostLimit = parseIntOption(args, ++i, currentArg);
break;
case "--ports", "-p":
ports = getArgument(args, ++i, currentArg);
break;
case "--quiet", "-q":
quiet = true;
break;
case "--showFilteredPorts", "-sf":
showFilteredPorts = true;
break;
case "--socketLimit", "-sl":
socketLimit = parseIntOption(args, ++i, currentArg);
break;
case "--timeout", "-t":
timeoutInMillis = parseIntOption(args, ++i, currentArg);
break;
default:
throw new IllegalArgumentException("No such param " + currentArg);
}
}
if (hostsArgv.isEmpty() && hostsFile == null) {
throw new IllegalArgumentException("No input provided. Check with --help for available options.");
}
return new ScanOptions(
hostsArgv.stream().toList(),
hostsFile,
ports,
bannerRecognition,
disableOnlineCheck,
quiet,
showFilteredPorts,
delayInMillis,
hostsLimit,
workersPerHostLimit,
socketLimit,
timeoutInMillis
);
}
private String getArgument(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 = getArgument(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 printUsageHelp() {
StringBuilder usage = new StringBuilder();
usage.append("""
Usage:
java -jar jscanner.jar [OPTIONS] [<host>,...]
Options:
""");
usage.append("""
--bannerRecognition, -b:\t\tEnable banner recognition to find out which service is running behind port (Default: %b)
--delay, -d:\t\t\tWaiting period in millis for connection attempts for a host (Default: %d)
--disableOnlineCheck, -do:\t\tDon't check if Host is reachable (Default: %b)
--input, -i:\t\t\tRead file to get host targets to scan. If set to "-" than Stdin is read (Default: null)
--hostsLimit, -hl:\t\t\tMax number of hosts that are scanned in parallel (Default: %d)
--workersPerHostLimit, -whl:\tMax workers per host. (Default: %d)
--ports, -p:\t\t\tDefine ports to be scanned (Default: %s)
--quiet, -q:\t\t\tDo not output progress bar (Default: %b)
--showFilteredPorts, -sf:\t\tShow also filtered ports (Default: %b)
--socketLimit, -sl:\t\t\tSocket limit in total. You can not scan more ports than allowed here (Default: %d)
--timeout, -t:\t\t\tTimeout in millis per connection attempt, 0 means infinite (Default: %d)
""".formatted(CliDefaults.BANNER_RECOGNITION, CliDefaults.DELAY_IN_MILLIS, CliDefaults.DISABLE_HOST_CHECK, CliDefaults.MAX_HOSTS_LIMIT, CliDefaults.MAX_WORKERS_PER_HOST, CliDefaults.PORTS, CliDefaults.QUIET, CliDefaults.SHOW_FILTERED_PORTS, CliDefaults.SOCKET_LIMIT, CliDefaults.TIMEOUT_IN_MILLIS)
);
usage.append("""
Examples:
java -jar jscanner.jar localhost
java -jar jscanner.jar fd00::1
""");
System.err.println(usage);
}
}
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