telnetftp.py

#!/usr/bin/env python
# By: Zachary Cutlip
# Twitter: @zcutlip
# upload a file to a system via telnet session
# e.g., use to bootstrap a more capable file transfer program
# onto a system where you only have telnet access

import binascii
from telnetlib import Telnet
import time
import math
import sys

BLOCKSIZE=64
ESCAPE="\\\\x"

FILENAME="busybox"
DESTINATION_FILE="/tmp/"+FILENAME
HOST="192.168.10.1"


class Logging:
    WARN=0
    INFO=1
    DEBUG=2
    prefixes=[]
    prefixes.append(" [!] ")
    prefixes.append(" [+] ")
    prefixes.append(" [@] ")
    @classmethod
    def log_msg(klass,msg,level=INFO):
        pref=Logging.prefixes[level]
        print pref+msg


def print_progress(bytes_written,total_bytes):
    percent=(bytes_written/float(total_bytes))*100
    marks=int(math.floor(percent / 2))
    dots=50-marks
    markstring="#" * marks
    dotstring="." * dots
    sys.stdout.write("\r[%s%s] %0.2f%%"%(markstring,dotstring,percent))
    sys.stdout.flush()


f=open("./%s"%FILENAME,'rb')

tn=Telnet(HOST)
command=("rm %s\n"%DESTINATION_FILE)
tn.write(command)
read_bytes=tn.read_very_eager()

Logging.log_msg("Removed %s from server."%DESTINATION_FILE)
Logging.log_msg("Uploading file:\t%s\n\t\t to:\t%s:%s"%(FILENAME,HOST,DESTINATION_FILE))

count=0
done=False

f.seek(0,2)
total_bytes=f.tell()
f.seek(0)

print("total byte: %d\n"%total_bytes)
while(not done):
    data=f.read(BLOCKSIZE)
    count+=len(data)
    if len(data) == 0:
        print ("read 0 bytes. breaking.")
        break
    elif len(data) < BLOCKSIZE:
        print ("read less than %d bytes. done after this loop."%BLOCKSIZE)
        done=True

    string=""
    for byte in data:
        string+=ESCAPE+binascii.b2a_hex(byte)

    command="echo -e -n \""+string+"\" >> %s\n"%DESTINATION_FILE

    tn.write(command)

    print_progress(count,total_bytes)
    time.sleep(0.2)

    read_bytes=tn.read_very_eager()

print ("\n\n")