use strict;
use warnings;

use Data::Dumper;

sub readlogfile {
	my ($filename) = @_;
	open my $logfile, '<', $filename
			or die "open $filename: $!";
	my (@lookup, $entry, $trap);
	while (<$logfile>) {
		chomp;
		if ( /^Date:\s+(.+)$/ ) {
			push @lookup, ($entry = { DATE => $1 });
			undef $trap;
		} elsif ( !$entry ) {
			next;
		} elsif ( /^(SServer|Device|CString|Port):\s+(.+)$/ ) {
			$entry->{uc $1} = $2;
		} elsif ( /^\s+(Trap OID|Generic|Specific|Varbind|Type):\s+(.+)$/ ) {
			$trap->{uc $1} = $2;
		} elsif ( /^\s+Data:\s+(.+)$/ ) {
			push @{$entry->{TRAPS}{TRAP_LIST}}, $trap if $trap;
			$trap = { DATA => $1 };
		}
	}
	return @lookup;
}

print Dumper readlogfile("logfile.txt");