Hi all,
When I execute the following code, it's captures all the data going trough my network card, that goes fine. But then i want to print the headers of the packets, see the if-statement:
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if (index($packet,"GET" gt 0)) {
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$start = (index($packet,"GET"));
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$end = (index($packet,"Content-Length: "));
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} else {
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$start = (index($packet,"POST"));
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$end = length($packet);
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}
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When the HTTP POST method is used, it has to print the whole header, including the POST variables. So the $end is just the lenght of the whole packet. When the GET method is used, I only want to have the header, until "Content-Length" or so. But, when i execute this, it will only print the GET requests. When i swap the POST en GET in the if-statement, it will only display the POST requests. Like so:
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if (index($packet,"POST" gt 0)) {
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$start = (index($packet,"POST"));
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$end = length($packet);
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} else {
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$start = (index($packet,"GET"));
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$end = (index($packet,"Content-Length: "));
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}
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I don't get this behavior, and it's driving me crazy, because I've tried alot of things..
Is there anyone who can help me out? Thanks in advance!!!
The whole script:
[/code]
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#!/usr/bin/perl -w
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use strict;
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use Net::PcapUtils;
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$,=' ';
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my $start;
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my $end;
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my $error = Net::PcapUtils::loop(\&print_packet);
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die $error if $error;
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sub print_packet {
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my($user_data, $header, $packet) = @_;
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if (index($packet,"HTTP") gt 0){
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if (index($packet,"GET" gt 0)) {
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$start = (index($packet,"GET"));
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$end = (index($packet,"Content-Length: "));
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} else {
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$start = (index($packet,"POST"));
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$end = length($packet);
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}
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print substr ($packet, $start,($end-$start))."\n";
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}
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}
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