From b06be4a65b35cf2b38e240edaaf1225d945c22ed Mon Sep 17 00:00:00 2001
From: root <root@sysrq>
Date: Wed, 4 Apr 2007 13:09:03 +0200
Subject: [PATCH] Add a cache to MBD.

---
 mbd/mbd.pl | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/mbd/mbd.pl b/mbd/mbd.pl
index 7fcc8d8..fe89d49 100644
--- a/mbd/mbd.pl
+++ b/mbd/mbd.pl
@@ -16,6 +16,28 @@ sub fhbits {
 	return $bits;
 }
 
+my %cidrcache = ();
+sub cache_cidrlookup {
+	my ($addr, $net) = @_;
+	my $key = $addr . " " . $net;
+
+	if (!exists($cidrcache{$key})) {
+		$cidrcache{$key} = Net::CIDR::cidrlookup($addr, $net);
+	}
+	return $cidrcache{$key};
+}
+
+my %rangecache = ();
+sub cache_cidrrange {
+	my ($net) = @_;
+
+	if (!exists($rangecache{$net})) {
+		($rangecache{$net}) = Net::CIDR::cidr2range($net);
+	}
+
+	return $rangecache{$net};
+}
+
 open LOG, ">>", "mbd.log";
 
 my @ports = mbd::find_all_ports();
@@ -73,9 +95,9 @@ while (1) {
 		next unless $pass;
 
 		for my $net (@Config::networks) {
-			next if (Net::CIDR::cidrlookup(inet_ntoa($saddr), $net));
+			next if (cache_cidrlookup(inet_ntoa($saddr), $net));
 
-			my ($range) = Net::CIDR::cidr2range($net);
+			my ($range) = cache_cidrrange($net);
 			$range =~ /-(.*?)$/;
 			my $broadcast = $1;
 
-- 
2.39.2