From 067835d5b0160e10a778252cf0dc6b2e4d1a74cb Mon Sep 17 00:00:00 2001
From: Dirk Koopman <djk@tobit.co.uk>
Date: Fri, 21 Jan 2022 22:46:21 +0000
Subject: [PATCH] add missing DXCIDR

---
 perl/DXCIDR.pm | 156 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 perl/DXCIDR.pm

diff --git a/perl/DXCIDR.pm b/perl/DXCIDR.pm
new file mode 100644
index 00000000..495768ed
--- /dev/null
+++ b/perl/DXCIDR.pm
@@ -0,0 +1,156 @@
+#
+# IP Address block list / checker
+#
+# This is a DXSpider compatible, optional skin over Net::CIDR::Lite
+# If Net::CIDR::Lite is not present, then a find will always returns 0
+#
+
+package DXCIDR;
+
+use strict;
+use warnings;
+use 5.16.1;
+use DXVars;
+use DXDebug;
+use DXUtil;
+use DXLog;
+use IO::File;
+use File::Copy;
+
+our $active = 0;
+our $badipfn = "badip";
+my $ipv4;
+my $ipv6;
+my $count4 = 0;
+my $count6 = 0;
+
+# load the badip file
+sub load
+{
+	if ($active) {
+		$count4 = _get($ipv4, 4);
+		$count6 = _get($ipv6, 6);
+	}
+	LogDbg('DXProt', "DXCIDR: loaded $count4 IPV4 addresses and $count6 IPV6 addresses");
+	return $count4 + $count6;
+}
+
+sub _fn
+{
+	return localdata($badipfn) . "$_[0]";
+}
+
+sub _get
+{
+	my $list = shift;
+	my $sort = shift;
+	my $fn = _fn($sort);
+	my $fh = IO::File->new($fn);
+	my $count = 0;
+	
+	if ($fh) {
+		while (<$fh>) {
+			chomp;
+			next if /^\s*\#/;
+			$list->add($_);
+			++$count;
+		}
+		$fh->close;
+		$list->clean if $count;
+	} elsif (-r $fn) {
+		LogDbg('err', "DXCIDR: $fn not found ($!)");
+	}
+	return $count;
+}
+
+sub _put
+{
+	my $list = shift;
+	my $sort = shift;
+	my $fn = _fn($sort);
+	my $r = rand;
+	my $fh = IO::File->new (">$fn.$r");
+	if ($fh) {
+		for ($list->list) {
+			$fh->print("$_\n");
+		}
+		move "$fn.$r", $fn;
+	} else {
+		LogDbg('err', "DXCIDR: cannot write $fn.$r $!");
+	}
+}
+
+sub add
+{
+	for (@_) {
+		# protect against stupid or malicious
+		next if /^127\./;
+		next if /^::1$/;
+		if (/\./) {
+			$ipv4->add($_);
+			++$count4;
+			LogDbg('DXProt', "DXCIDR: Added IPV4 $_ address");
+		} else {
+			$ipv6->add($_);
+			++$count6;
+			LogDbg('DXProt', "DXCIDR: Added IPV6 $_ address");
+		}
+	}
+	if ($ipv4 && $count4) {
+		$ipv4->prep_find;
+		_put($ipv4, 4);
+	}
+	if ($ipv6 && $count6) {
+		$ipv6->prep_find;
+		_put($ipv6, 6);
+	}
+}
+
+sub save
+{
+	return 0 unless $active;
+	my $list = $ipv4->list;
+	_put($list, 4) if $list;
+	$list = $ipv6->list;
+	_put($list, 6) if $list;
+}
+
+sub list
+{
+	my @out;
+	push @out, $ipv4->list;
+	push @out, $ipv6->list;
+	return (1, sort @out);
+}
+
+sub find
+{
+	return 0 unless $active;
+	return 0 unless $_[0];
+	
+	if ($_[0] =~ /\./) {
+		return $ipv4->find($_[0]) if $count4;
+	}
+	return $ipv6->find($_[0]) if $count6;
+}
+
+sub init
+{
+	eval { require Net::CIDR::Lite };
+	if ($@) {
+		LogDbg('DXProt', "DXCIDR: load (cpanm) the perl module Net::CIDR::Lite to check for bad IP addresses (or CIDR ranges)");
+		return;
+	}
+
+	import Net::CIDR::Lite;
+
+	$ipv4 = Net::CIDR::Lite->new;
+	$ipv6 = Net::CIDR::Lite->new;
+
+	load();
+	$active = 1;
+}
+
+
+
+1;
-- 
2.43.0