Re: Reading a Line from a File then Assigning it to a variable

This is all about knowing the data. You have to understand the realms of the world you're working in.

1. The first value in a rule can only be Source or Destination.
2. The second value is the name of a value in the packet.
3. The third value is the value in the packet itself.

Correct?
Then knowing that, start constructing the same guidelines of the data for the ip packets themselves. Know where in the packet you can find whether it's a source or not. Know where the ip is stored and the domain is stored. Once you know all that, it's a simple matching.

As you've said, it's vague as to which part of the assignment you're actually having trouble with. If it's not the logic of it, and you're having trouble with coding something that goes through a file line by line, then see below

use warnings;
use strict;

open(FH, '<', "rules.txt");
my @data = <FH>;
close FH;

foreach my $value (@data)
{
       chomp($value);
       my ($SourceorDestination, $name, $value) = split(/,/, $value); 
       #Insert compare code here
}
[download]

I know that many monks would tell you not to load the contents of the file into an array like I have, but I imagine that your rules file won't be huge and you'll be needing it every time you compare a packet.

Comment on Re: Reading a Line from a File then Assigning it to a variable Download Code

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Re^2: Reading a Line from a File then Assigning it to a variable by InfiniteSilence (Curate) on Apr 21, 2011 at 15:06 UTC
"...I know that many monks would tell you not to load the contents of the file ..." Yeah, you guessed that right. What you are essentially doing is reading the file once and then repeatedly splitting each line. Let's say this was production code and you read in the file in that array in the beginning and hold it in memory to processing. Each time you encounter a packet you have to perform the same split over again on the line. Why not split earlier and store in a data structure to save clock cycles? Celebrate Intellectual Diversity	[reply]
Re^2: Reading a Line from a File then Assigning it to a variable by burningredmoon (Novice) on Apr 21, 2011 at 14:15 UTC
First of all, thank you so much for replying, I think this will help a lot. I was just about to update it, after speaking to a classmate of mine, he told me about using an array. This is exactly what I needed. I'm going to put it in right now and see if I can get it working. You're a life saver!	[reply]