Question

Write a Python program named aIP.py which will read data from a file named wireShark.txt and extract all the pairs of source and destination ip addresses and output them in pairs to another file called IPAddresses.txt , one per line, listing source and destination.

Example of output:

Source                      Destination

192.168.1.180         239.255.255.250

Detailed Requirements:

• You will read from a file called wireShark.txt which, to avoid problems with finding paths, will be located in the same directory as your code
• You will write to a file called IPAddresses.txt which, to eliminate problems with finding paths, will be located in the same directory as your code
• All files will be opened and closed correctly.
• Do not use regex to parse the file, i. e., do not import re. Instead, you will check the tokens extracted from a line of text using the split function.
• This assignment will assess your ability to:
  • use loops
  • read a line of text from a file
  • split a string into its individual tokens and put them in a list
  • examine the values of particular elements in a list
  • use "if" structures
  • write a line of text to a file
  • You will use one or more functions which will take a parameter or more, and return a value
• Advice: open wireShark.txt in a text editor to study the format of the lines in it and get an idea of what your program will "see" when it reads it.
• The key problem is determining when the next line of wireShark.txt contains source and destination IP Addresses. How will you accomplish this? If the current line has the following content which was copied from the file, then the next line has IP addresses.

353.      Time           Source                Destination           Protocol Length Info

Key point: if your program splits each line of input it reads and places the resulting tokens in a list, which elements -- 0, 1, 2, 3 or 4 -- contain the text Source and Destination? Once you have identified this particular line, you will know that the following line has the IP addresses for source and destination. When your program splits the next line of input, shown below, and places the resulting tokens in a list, which elements contain the IP addresses?

      1 0.000000       192.168.1.180         239.255.255.250       SSDP     372    NOTIFY * HTTP/1.1

• Actions to performed by this program:
  • The main function will open both the input and output files.
  • It will write the heading Source and Destination to the output file.
  • It will pass the variables that represent the files to a function will:
    • read the input file
    • split the input into tokens and insert them into a list
    • check for Source and Destination in each line
    • read the next line after the one containing Source and Destination to obtain the IP addresses
    • write them to a file
    • keep count of the number of lines it reads and writes
    • return these counts to main
  • main will then display the counts to the screen.

wireShark.txt:

Source: 192.168.1.180
Destination: 239.255.255.250

No. Time Source Destination Protocol Length Info
2 0.307821 192.168.1.180 239.255.255.250 SSDP 422 NOTIFY * HTTP/1.1

Source: 192.168.1.180
Destination: 239.255.255.250

No. Time Source Destination Protocol Length Info
3 0.325254 192.168.1.51 146.20.112.65 TCP 55 51333 → 443 [ACK] Seq=1 Ack=1 Win=258 Len=1 [TCP segment of a reassembled PDU]

Source: 192.168.1.51
Destination: 146.20.112.65

No. Time Source Destination Protocol Length Info
4 0.340841 192.168.1.51 146.20.112.65 TCP 55 51349 → 443 [ACK] Seq=1 Ack=1 Win=255 Len=1 [TCP segment of a reassembled PDU]

Source: 192.168.1.51
Destination: 146.20.112.65

No. Time Source Destination Protocol Length Info
5 0.359448 192.168.1.51 146.20.112.65 TCP 55 51335 → 443 [ACK] Seq=1 Ack=1 Win=253 Len=1 [TCP segment of a reassembled PDU]

Source: 192.168.1.51
Destination: 146.20.112.65

No. Time Source Destination Protocol Length Info
6 0.406275 146.20.112.65 192.168.1.51 TCP 66 443 → 51333 [ACK] Seq=1 Ack=2 Win=356 Len=0 SLE=1 SRE=2

Source: 146.20.112.65
Destination: 192.168.1.51

No. Time Source Destination Protocol Length Info
7 0.416052 146.20.112.65 192.168.1.51 TCP 66 443 → 51349 [ACK] Seq=1 Ack=2 Win=356 Len=0 SLE=1 SRE=2

Source: 146.20.112.65
Destination: 192.168.1.51

No. Time Source Destination Protocol Length Info
8 0.433884 146.20.112.65 192.168.1.51 TCP 66 443 → 51335 [ACK] Seq=1 Ack=2 Win=356 Len=0 SLE=1 SRE=2

Answer 1

#open output file
with open("ipaddress.txt","w") as out:
   #open input file
   with open("wireshark.txt", "r") as inp:
       #readline from input file
       for line in inp:
           #split the line using ' '
           obj = line.split(' ')
           if 'Source' in obj and 'Destination' in obj:
               temp = inp.readline().split()
               out.write("source \t destination\n")
               out.write(temp[2] + "\t" + temp[3] + "\n")