#!/usr/bin/python
# -*- coding: utf-8 -*-

import optparse
from socket import *
from threading import *

screenLock = Semaphore(value=1)

def connScan(tgtHost, tgtPort):
    try:
        connSkt = socket(AF_INET, SOCK_STREAM)
        connSkt.connect((tgtHost, tgtPort))
        connSkt.send('ViolentPython\r\n')
        results = connSkt.recv(100)
        screenLock.acquire()
        print '[+] %d/tcp open' % tgtPort
        print '[+] ' + str(results)
    except:
        screenLock.acquire()
        print '[-] %d/tcp closed' % tgtPort
    finally:
	screenLock.release()
	connSkt.close()	

def portScan(tgtHost, tgtPorts):
    try:
        tgtIP = gethostbyname(tgtHost)
    except:
        print "[-] Cannot resolve '%s': Unknown host" %tgtHost
        return

    try:
        tgtName = gethostbyaddr(tgtIP)
        print '\n[+] Scan Results for: ' + tgtName[0]
    except:
        print '\n[+] Scan Results for: ' + tgtIP

    setdefaulttimeout(1)
    for tgtPort in tgtPorts:
        t = Thread(target=connScan,args=(tgtHost,int(tgtPort)))
        t.start()

def main():
    parser = optparse.OptionParser('usage %prog '+\
      '-H <target host> -p <target port>')
    parser.add_option('-H', dest='tgtHost', type='string',\
      help='specify target host')
    parser.add_option('-p', dest='tgtPort', type='string',\
      help='specify target port[s] separated by comma')

    (options, args) = parser.parse_args()

    tgtHost = options.tgtHost
    tgtPorts = str(options.tgtPort).split(',')

    if (tgtHost == None) | (tgtPorts[0] == None):
	print parser.usage
        exit(0)

    portScan(tgtHost, tgtPorts)


if __name__ == '__main__':
    main()
