Basic Python port scanner

This is a basic port scanner implementation in Python; it attempts to connect to the given ports of the specified host (all ports, if none indicated), and outputs to a text file and to the console if a given port is open – if it is, it then attempts to retrieve information about what is running on the port by sending “loremipsum”, and outputting the recieved information.

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import optparse
import sys
from threading import *
from socket import *
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wait = Semaphore(value=1)
openCount = 0
closedCount = 0
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def connectionScan(targetHost, targetPort, outFileOpen, outFileClosed):
	try:
		s = socket(AF_INET, SOCK_STREAM) # connect to IPv4 socket
		s.connect((targetHost, targetPort)) # open connection to see if recv
		s.send('loremipsum\r\n') # send data
		banner = s.recv(200)
		wait.acquire()
		print "\n[+]TCP port %d open" % targetPort
		print "\n[+]Recieved data - %s" % str(banner)
		print >> outFileOpen, "\n[+]TCP port %d open" % targetPort
		print >> outFileOpen, "\n[+]Recieved data - %s" % str(banner)
		++openCount
                s.close()
	except:
		wait.acquire()
		print >> outFileClosed, "\n[-]TCP port %d closed" % targetPort
		++closedCount
		pass
	finally:
		wait.release()
		sys.exit()
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def portScanner(targetHost, targetPorts, outPath):
	threads = []
	outFileOpen = open(outPath+"open.txt","w")
	outFileClosed = open(outPath+"closed.txt","w")
	try:
		targetAddress = gethostbyname(targetHost) # attempt to resolve host
		print "\n[+] Address resolved to %s" % targetAddress
	except Exception as e:
		print "\n[*] Address unresolved"
		print "Error:", e
		sys.exit()
	try:
		targetName = gethostbyaddr(targetAddress)
		print "\n[+] Host name resolved to %s" % targetName[0]
		print "\n[*] Scanning: %s" % targetName[0] # Print target
	except:
		print "\n[-] Unable to resolve %s" % targetAddress
		print "\n[*] Scanning: %s" % targetAddress
	for targetPort in targetPorts:
		t = Thread(target=connectionScan, args =(targetHost, int(targetPort), outFileOpen, outFileClosed))
		threads.append(t)
	for process in threads:
		process.start()
	for process in threads:
		process.join()
	outFileOpen.close()
	outFileClosed.close()
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def main():
	lineIn = optparse.OptionParser('usage %prog -H' +\
		'  -P ')
	lineIn.add_option('-H', dest='targetHost', type='string', \
		help='indicate the target host')
	lineIn.add_option('-P', dest='targetPort', type='string', \
		help='indicate the target ports, if none then all possible ports selected')
	(options, args) = lineIn.parse_args() # parse options
	targetHost = options.targetHost # assign target host
	targetPorts = str(options.targetPort).split(',') # assign target ports and strip commas
	if targetHost == None:
		print lineIn.usage
		sys.exit()
	elif (len(sys.argv) < 4):
		print "\nPort options not found - defaulting to all ports"
		targetPorts.pop(0)
		for i in range(0,65536):
			targetPorts.append(str(i))
		print "Target host: %s" % targetHost
	else:
		print "Target host: %s\nTarget ports: " % targetHost
		for port in targetPorts:
			print " "+port
	outPath = targetHost + "_ports"
	portScanner(targetHost, targetPorts, outPath)
	print "Open ports output to ./%s" % outPath + "open.txt"
	print "%d scanned ports are open" % openCount
	print "Closed ports output to ./%s" % outPath + "closed.txt"
	print "%d scanned ports are closed" % closedCount
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if __name__ == '__main__':
	main()
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