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https://github.com/pandorafms/pandorafms.git
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117 lines
3.0 KiB
Perl
117 lines
3.0 KiB
Perl
#!/usr/bin/perl
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# (c) Ártica ST 2016 <info@artica.es>
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# Utility functions for the network topology discovery modules.
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package PandoraFMS::Recon::Util;
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use strict;
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use warnings;
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# Default lib dir for RPM and DEB packages.
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use lib '/usr/lib/perl5';
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use Socket qw/inet_aton/;
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our @ISA = ("Exporter");
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our %EXPORT_TAGS = ( 'all' => [ qw( ) ] );
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our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
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our @EXPORT = qw(
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ip_to_long
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mac_matches
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mac_to_dec
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parse_mac
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subnet_matches
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);
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########################################################################################
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# Return the numeric representation of the given IP address.
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########################################################################################
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sub ip_to_long($) {
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my $ip_address = shift;
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return unpack('N', inet_aton($ip_address));
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}
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########################################################################################
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# Returns 1 if the two given MAC addresses are the same.
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########################################################################################
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sub mac_matches($$) {
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my ($mac_1, $mac_2) = @_;
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if (parse_mac($mac_1) eq parse_mac($mac_2)) {
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return 1;
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}
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return 0;
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}
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########################################################################################
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# Convert a MAC address to decimal dotted notation.
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########################################################################################
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sub mac_to_dec($) {
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my $mac = shift;
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my $dec_mac = '';
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my @elements = split(/:/, $mac);
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foreach my $element (@elements) {
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$dec_mac .= unpack('s', pack 's', hex($element)) . '.'
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}
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chop($dec_mac);
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return $dec_mac;
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}
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########################################################################################
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# Make sure all MAC addresses are in the same format (00 11 22 33 44 55 66).
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########################################################################################
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sub parse_mac($) {
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my ($mac) = @_;
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# Remove leading and trailing whitespaces.
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$mac =~ s/(^\s+)|(\s+$)//g;
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# Replace whitespaces and dots with colons.
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$mac =~ s/\s+|\./:/g;
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# Convert hex digits to uppercase.
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$mac =~ s/([a-f])/\U$1/g;
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# Add a leading 0 to single digits.
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$mac =~ s/^([0-9A-F]):/0$1:/g;
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$mac =~ s/:([0-9A-F]):/:0$1:/g;
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$mac =~ s/:([0-9A-F])$/:0$1/g;
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return $mac;
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}
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########################################################################################
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# Returns 1 if the given IP address belongs to the given subnet.
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########################################################################################
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sub subnet_matches($$;$) {
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my ($ipaddr, $subnet, $mask) = @_;
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my ($netaddr, $netmask);
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# Decimal dot notation mask.
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if (defined($mask)) {
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$netaddr = $subnet;
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$netmask = ip_to_long($mask);
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}
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# CIDR notation.
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else {
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($netaddr, $netmask) = split('/', $subnet);
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return 0 unless defined($netmask);
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# Convert the netmask to a numeric format.
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$netmask = -1 << (32 - $netmask);
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}
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if ((ip_to_long($ipaddr) & $netmask) == (ip_to_long($netaddr) & $netmask)) {
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return 1;
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}
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return 0;
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}
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1;
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__END__
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