/
process_packets.py
executable file
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/
process_packets.py
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#!/usr/bin/env python3
##########################################################################################################
# S A M P L E 1 0 0 B I T J C P A C K E T #
##########################################################################################################
# Leading | Sender | Receiver | DateTime | Control Code | Part Num | Total Parts | Data | Check Sum #
#---------|--------|----------|----------|--------------|----------|-------------|-----------|-----------#
# 1 | 3 | 3 | 12 | 4 | 4 | 4 | 32 | 4 #
##########################################################################################################
import fileinput
import datetime
import time
import binascii
import subprocess
import re
import sys
######################################################
# Vars
sender_len = 3
receiver_len = 3
datetime_len = 12
control_code_len = 4
part_num_len = 4
total_parts_len = 4
data_len = 32
check_sum_len = 4
header_len = sender_len + receiver_len + datetime_len + control_code_len;
c = 0 #packet cursor
######################################################
# Methods
def extract(str, len):
global c
part = str[c:c+len]
c += len
return part
def bitstring_to_bytes(s):
try:
return int(s, 2).to_bytes(len(s) // 7, byteorder='big')
except:
return ""
def verfiy_packets(packets):
count = 0
for packet in packets:
if int(packet[header_len:header_len+part_num_len], 2) == count:
count += 1
else:
return False
if (count-1) == int(packet[header_len+part_num_len:header_len+part_num_len+total_parts_len], 2):
return True
else:
return False
######################################################
processed = []
lines = []
with open("/home/pi/370_Term_Project/unprocessed_packets.log","r") as input:
for line in input:
if(len(line) > header_len):
lines.append(line)
headers = set([])
for line in lines:
headers.add(line[:header_len])
for header in headers:
packets = []
for line in lines:
if line[:header_len] == header:
packets.append(line)
packets = sorted(set(packets))
if verfiy_packets(packets):
try:
message = ""
for packet in packets:
message += packet[header_len+part_num_len+total_parts_len:-1*(check_sum_len+1)]
c = 0
entry = []
entry.append(str(int(extract(packet, sender_len), 2)))
entry.append(str(int(extract(packet, receiver_len), 2)))
#Convert Time
seconds = int(extract(packet, datetime_len), 2)
dUTC = datetime.datetime.now(datetime.timezone.utc)
dtUTC = dUTC.timetuple()
sendTime = datetime.datetime(dtUTC.tm_year, dtUTC.tm_mon, dtUTC.tm_mday, dtUTC.tm_hour, 0, 0, 0, tzinfo=datetime.timezone.utc) + datetime.timedelta(seconds=seconds)
if dUTC < sendTime:
sendTime = sendTime - datetime.timedelta(seconds=3600)
#Adjust for MST
sendTime = sendTime - datetime.timedelta(seconds=3600*7)
entry.append(sendTime.strftime("%H:%M:%S MST, %m/%d/%Y"))
entry.append(str(int(extract(packet, control_code_len), 2)))
splitMessage = [message[i:i+7] for i in range(0, len(message), 7)]
ascii = "";
for character in splitMessage:
ascii += bitstring_to_bytes(character).decode()
entry.append(ascii)
#Process message
if(int(entry[3]) == 0):
#ACK
pass
elif (int(entry[3]) == 1):
#Text
print("To:\t"+entry[0])
print("From:\t"+entry[1])
print("Date:\t"+str(entry[2]))
print("Message:\t"+entry[4])
elif (int(entry[3]) == 2):
#Encrypted Text
print("Encryption is not yet supported.")
pass
elif (int(entry[3]) == 3):
#RCE
print("To:\t"+entry[0])
print("From:\t"+entry[1])
print("Date:\t"+entry[2])
print("Command: "+entry[4])
subprocess.Popen(entry[4], shell=True)
elif (int(entry[3]) == 4):
#Encrypted RCE
print("Encryption is not yet supported.")
pass
else:
#Unknown
print("Control Code Unknown!")
print(entry)
#Add packets for deletion
for packet in packets:
processed.append(packet)
except:
pass
with open("/home/pi/370_Term_Project/unprocessed_packets.log","r") as input:
with open("/home/pi/370_Term_Project/unprocessed_packets.tmp","w") as output:
for line in input:
if line not in processed:
if len(line) > header_len:
output.write(line)
subprocess.call(['mv','/home/pi/370_Term_Project/unprocessed_packets.tmp','/home/pi/370_Term_Project/unprocessed_packets.log'])