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

VERSION='1.3.0'

def getPortInfo(port, portfile):
    """
           Get info about service commonly used on this port
    """

    ## Start reading the file from start of the file
    portfile.seek(0)
    ## Read every line until EOF
    line = "init"
    while line != '':
        line = portfile.readline()
        ## Don't read lines that are commented out
        if line[0] == '#':
            continue

        ## Split line using tab as delimiter and read the port number
        split_line = line.split('\t')

        portnum = split_line[1].split('/')[0]

        ## If portnum equals port return the name of service
        if int(portnum) != port:
            continue
        else:
            return split_line[0]
    return "portinfo_error"


def getBanner(host, port, wait, notor):
    """
            Receive first 80 bytes from port, return string of received data
            Don't use Tor if address is private.
    """

    ## Check if IP address is private
    try:
        if ip_address(host).is_private:
            notor = True
    except:
        pass

    ## 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
    try:
        sckt.connect((host, port))
    except:
        return "banner_error"
    ## Try to retrive data without sending anything
    try:
        banner = sckt.recv(80)
        sckt.close()
        return banner.decode().replace('\n','')
    except KeyboardInterrupt:
        exit()
    except Exception as e:
        ## If the connection timed out, try to send HTTP GET request
        if str(e) == 'timed out':
            try:
                ## Pretend to be mozzila firefox in the payload
                payload = "GET / HTTP/1.1\r\nHost: " + str(host) + "\r\nUser-Agent: Mozilla/5.0\r\n\r\n"
                ## Encode the payload and send it all
                sckt.sendall(payload.encode())
                banner = sckt.recv(20)
                sckt.close()
                return banner.decode().replace('\n','')
            except:
                return "banner_error"
        else:
            return "banner_error"


def connScan(host, port, wait, notor, openports):
    """
         Open connection on specific port, return True if successful
         If notor is set to True, it doesn't use the socks proxy
    """

    ## Check if tor is to be used for connection
    if notor:
        sckt = socket(AF_INET, SOCK_STREAM)
    else:
        sckt = socks.socksocket()

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


def portScan(host, ports, wait, notor, jobs):
    """
        Go through all ports and call connScan for each, return list of open ports
        If there is more threads than JOBS, wait until they finish.
    """

    ## openports is the list of ports that are open, this is the return value
    ## threads is the list of threads currently active
    openports = list()
    threads = list()

    ## If port is valid and there aren't more then JOBS number of threads, start a new thread with a next port to scan
    for p in ports:
        if p > 65535:
            return openports

        while  threading.activeCount() >= jobs + 1:
            pass

        thread=threading.Thread(target=connScan,args=(host, p, wait, notor, openports))
        threads.append(thread)
        thread.start()

    ## Wait until all threads are done
    for thread in threads:
        thread.join()

    return openports

def hostScan(host, ports, wait, notor, jobs):
    """
        Go through all hosts and call portScan for each one, return dictionary of hosts with their open ports
    """

    ## ret will be the return value
    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, jobs)
                else:
                    ret[str(ip)] = portScan(str(ip), ports, wait, notor, jobs)
        else:
            if ips.is_private:
                ret[str(host)] = portScan(str(host), ports, wait, True, jobs)
            else:
                ret[str(host)] = portScan(str(host), ports, wait, notor, jobs)
    ## Otherwise scan host as usual
    except:
        if host == 'localhost':
            ret[str(host)] = portScan(str(host), ports, wait, True, jobs)
        else:
            ret[str(host)] = portScan(str(host), ports, wait, notor, jobs)

    return ret

def parseArgs(parser):
    """
        Parse all arguments and return the list of argument values
    """

    ## Every line here represents one argument that can be used in Tmap
    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="80,631,161,137,123,138,1434,445,135,67,23,53,443,21,139,22,500,68,520,1900,25,4500,514,49152,162,69,5353,111,49154,3389,110,1701,998,996,997,999,3283,49153,445,1812,136,139,143,53,2222,135,3306,2049,32768,5060,8080,1025,1433,3456,80,1723,111,995,993,20031,1026,7,5900,1646,1645,593,1025,518,2048,626,1027,587,177,1719,427,497,8888,4444,1023,65024,199,19,9,49193,1029,1720,49,465,88,1028,17185,1718,49186,548,113,81,6001,2000,10000,31337,9001,8333")
    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("--banner", dest="banner", help="print data received from open ports", 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("-j", "--jobs", metavar="JOBS", dest="jobs", type=int, help="maximum number of open connections at the same time", default="10")
    parser.add_argument("--output", metavar="OUTFILE", dest="outFile", help="write scan results to output file", default="empty_outfile")
    return parser.parse_args()


def main():
    ## Record time of program starting in seconds
    startTime = time.time()
    args = parseArgs(argparse.ArgumentParser(description="Simple stateful port scanner that works over Tor"))

    ## Version argument
    if args.version:
        print("Tmap " + VERSION)
        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)

    ## Load nmap-services file
    PORTFILE = open("nmap-services", "r")

    ## 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
    BANNER = False
    OUTFILE = args.outFile
    JOBS = args.jobs

    if args.clearnet:
        CLEARNET=True

    if args.banner:
        BANNER=True

    ## Check if Tor is running
    emptylist=list()
    if CLEARNET == False:
        if connScan("127.0.0.1", args.torPort, 3, True, emptylist):
            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")
    else:
        f = sys.stdout

    ## Display message that scan is starting
    f.write("Starting a scan...\n")

    ## Scan each host in HOSTS list
    r = dict()
    for h in HOSTS:
        if h[-6:] == '.onion':
            ## Onion hosts need to be scanned one port at a time,for some reason
            r = hostScan(h, PORTS, WAIT_TIME, CLEARNET, 1)
        else:
            r = hostScan(h, PORTS, WAIT_TIME, CLEARNET, JOBS)
        ## Result of the scan for each host we store in r variable
        for i in r.keys():
            ## if there is nothing wirtten, there are no ports open on that host, skip to next one
            if len(r[i]) == 0:
                continue
            f.write('Tmap scan report for {}\n'.format(i))
            ## If BANNER argument isn's specified only print ports and their respective service
            if BANNER == False:
                f.write('PORT\tSTATE\tSERVICE\n')
                for j in r[i]:
                    service = getPortInfo(j,PORTFILE)
                    f.write('{}\topen\t{}\n'.format(j,service))
            ## If BANNER is specified, retrive banner for each port and print it next to earlier port reports
            if BANNER:
                f.write('PORT\tSTATE\tSERVICE\tBANNER\n')
                for j in r[i]:
                    banner = getBanner(i,j,WAIT_TIME, CLEARNET)
                    service = getPortInfo(j,PORTFILE)
                    ## If there was error when reading banner, don't print nothing in it's place
                    if banner == "banner_error":
                        f.write('{}\topen\t{}\n'.format(j,service))
                    else:
                        f.write('{}\topen\t{}\t{}\n'.format(j,service,banner))

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

    f.write("Scan done in {} seconds\n".format(totalTime))

    ## If output file is defined inform the user where the results are written
    if OUTFILE != "empty_outfile":
        print("Results written to {}".format(OUTFILE))
        f.close()

if __name__ == "__main__":
    main()