#!/usr/bin/python3
from socket import *
import socks
import argparse
import time
from ipaddress import *

## This function tries to open a connection on a specific port, returns True if successful
def connScan(host, port, wait, notor):
	## If notor is set to True, it doesn't use the socks proxy
	if notor:
		sckt = socket(AF_INET, SOCK_STREAM)
	else:
		sckt = socks.socksocket()

	sckt.settimeout(wait)
	## Try to connect, return True on success and False on failure
	try:
		sckt.connect((host, port))
		sckt.close()
		return True
	except KeyboardInterrupt:
		exit()
	except:
		return False


## This function goes throgh all ports and calls connScan for each one, returns list of open ports
def portScan(host, ports, wait, notor):
	openports = list()
	for p in ports:
		if p > 65535:
			return openports
		elif connScan(host, p, wait, notor):
			openports.append(p)
	return openports

## This function goes throgh all hosts and calls portScan for each one, returns dictionary of hosts with open ports
def hostScan(host, ports, wait, notor):
	ret = dict()
	## Check if python version 3
	try:
		host = unicode(host)
	except:
		pass

	## Check if host is a network range, don't use tor for private IPs
	try:
		ips = ip_network(host)
		if ips.num_addresses > 1:
			for ip in ips.hosts():
				if ip.is_private:
					ret[str(ip)] = portScan(str(ip), ports, wait, True)
				else:
					ret[str(ip)] = portScan(str(ip), ports, wait, notor)
		else:
			if ips.is_private:
				ret[str(host)] = portScan(str(host), ports, wait, True)
			else:
				ret[str(host)] = portScan(str(host), ports, wait, notor)
	## Otherwise scan host as usual
	except:
		if host == 'localhost':
			ret[str(host)] = portScan(str(host), ports, wait, True)
		else:
			ret[str(host)] = portScan(str(host), ports, wait, notor)

	return ret

def main():
	## Record time of program starting in seconds
	startTime = time.time()

	## Define and parse the arguments
	parser = argparse.ArgumentParser(description="Simple stateful port scanner that works over Tor")
	parser.add_argument("--version", dest="version", help="print version information and exit", action="store_true")
	parser.add_argument("HOSTS", help="IP address or domain to scan", default="empty_host", nargs="?")
	parser.add_argument("-H", "--hosts", metavar="HOSTS", dest="tgtHost", help="IP address or domain to scan", default="empty_host_option")
	parser.add_argument("-p", "--ports", metavar="PORTS", dest="tgtPort", help="ports to scan, seperated by a comma", default="20-25,53,80-85,443-445,8080,8333,9050,9150")
	parser.add_argument("-t", "--timeout", metavar="TIMEOUT", dest="sockTimeout", type=int, help="seconds to wait before connection timeout for each port", default=3)
	parser.add_argument("--clearnet", dest="clearnet", help="don't use Tor for scanning, connect directly instead", action="store_true")
	parser.add_argument("--torport", metavar="TORPORT", dest="torPort", type=int, help="port on which Tor is listening on", default="9050")
	parser.add_argument("--output", metavar="OUTFILE", dest="outFile", help="write scan results to output file", default="empty_outfile")

	args = parser.parse_args()

	## Version argument
	if args.version:
		print("Tmap 1.0.0")
		print("License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>")
		print("This is free software: you are free to change and redistribute it.")
		print("There is NO WARRANTY, to the extent permitted by law.")
		exit()

	## Set Tor as default Tor proxy for the scanner
	socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS5, "127.0.0.1", args.torPort)

	## Combine HOST and --hosts values
	if args.HOSTS == "empty_host":
		if args.tgtHost == "empty_host_option":
			parser.print_help()
			print ("Host must be specified")
			exit()
		else:
			args.HOSTS = args.tgtHost
	else:
		if args.tgtHost != "empty_host_option":
			args.HOSTS = args.HOSTS + "," + args.tgtHost

	## Load specified ports into PORTS list
	PORTS = list()
	for p in args.tgtPort.split(","):
		## If p is not a range, add it to the list of ports to scan
		if "-" not in p:
			try:
				p = int(p)
				PORTS.append(p)
			except:
				parser.print_help()
				print("Ports must be integers")
				exit()
		## If p is a range, add a range of ports to the list of ports to scan
		else:
			try:
				p = list(map(int, p.split("-")))
			except:
				parser.print_help()
				print("Ports in a range must be integers")
				exit()
			## Range needs to be defined as exactly two integers separated by "-"
			if len(p) != 2 or p[0] > p[1]:
				parser.print_help()
				print("Port range improperly defined")
				exit()
			else:
				p = list(range(p[0],p[1]+1))
				PORTS += p

	## Load other variables
	HOSTS = args.HOSTS.split(",")
	WAIT_TIME = args.sockTimeout
	CLEARNET = False
	OUTFILE = args.outFile

	if args.clearnet:
		CLEARNET=True

	## Check if Tor is running if CLEARNET is False
	if CLEARNET == False:
		if connScan("127.0.0.1", args.torPort, 3, True):
			pass
		else:
			print("Tor is not running on port {}.".format(args.torPort))
			exit()

	## Checking for file output
	if OUTFILE != "empty_outfile":
		f = open(OUTFILE, "w")

	## Display message that scan is starting
	print("Starting a scan...")

	## Scan each host in HOSTS list
	r = dict()
	for h in HOSTS:
		r = hostScan(h, PORTS, WAIT_TIME, CLEARNET)
		if OUTFILE == "empty_outfile":
			print("Results for: {}".format(h))
		else:
			f.write("Results for: {}".format(h))
		for i in r.keys():
			if len(r[i]) != 0:
				if OUTFILE == "empty_outfile":
					print('{} open ports: {}'.format(i, str(r[i])))
				else:
					f.write('{} open ports: {}\n'.format(i, str(r[i])))

	## Record time of program stopping and display the time running to the user
	endTime = time.time()
	totalTime = round(endTime - startTime, 2)

	if OUTFILE == "empty_outfile":
		print("Scan done in {} seconds".format(totalTime))
	else:
		f.write("Scan done in {} seconds\n".format(totalTime))
		f.close()
		print("Results written to {}".format(OUTFILE))

	## We are done here
	exit()

if __name__ == "__main__":
	main()