Very Simple FTP Fuzzer

Written in Python, i try to make a simple fuzzer for FTP server. This script will try to fuzz the commands like APPE, USER, LIST, CWD, etc..you can find all commands here 😉
This script is simply a modified version from muts simple ftp fuzzer during offsec training 😀
Hope you like it 🙂

#!/usr/bin/env python
########################################################
# Very Simple FTP Fuzzer                               #
# this is a modified version from simple ftp fuzzer    #
# coded by muts                                        #
#                                                      #
# thx: oebaj, offsec, xecureit, jasakom, 0x70y #
########################################################
import sys, socket
from optparse import OptionParser
usage = "./%prog -t [target] -p [port] -u [ftp user] -P [ftp passwd] -c [command to fuzz]"
usage += "nContoh: ./%prog -t 192.168.10.10 -p 21 -u ftp -P ftp -c APPE"
parser = OptionParser(usage=usage)
parser.add_option("-p", type="string", action="store", dest="port",
		help="Port to connect")
parser.add_option("-t", type="string", action="store", dest="target",
		help="The target server")
parser.add_option("-u", type="string", action="store", dest="username",
		help="FTP username")
parser.add_option("-P", type="string", action="store", dest="password",
		help="FTP password")
parser.add_option("-c", type="string", action="store", dest="fuzz",
		help="Command to Fuzz ")
(options, args) = parser.parse_args()
def banner():
	print "ntt|------------------------------------------------------------------|"
	print "tt|	  	      Very Simple FTP Fuzzer			   |"
	print "tt|------------------------[ by modpr0be ]---------------------------|"
	print "tt|-----------------[ modpr0be[at]postnix[dot]org ]------------------|"
	print "tt|-------------------[ originally coded by muts ]-------------------|"
	print "tt|------------------------------------------------------------------|n"
if len(sys.argv) < 4:
	banner()
	parser.print_help()
	sys.exit(1)
def cmd():
	for string in buffer:
		print "Fuzzing command " + (options.fuzz) + ": " +str(len(string))
		s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
		connect=s.connect((options.target, 21))
		s.recv(1024)
		s.send('USER '+(options.username)+'rn')
		s.recv(1024)
		s.send('PASS '+(options.password)+'rn')
		s.recv(1024)
		s.send((options.fuzz) + ' ' + string + 'rn')
		s.recv(1024)
		s.send('byern')
		s.close()
banner()
buffer = ["A"]
counter = 100
while len(buffer) <=100:
	buffer.append("A" * counter)
	counter = counter + 100
cmd()
#20109modpr0be