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('Connecting Bro')
        results=connSkt.recv()
        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"[-] Cannnot 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')
    (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()
    