1#!/usr/bin/perl -w
2#
3#
4# A script that generates text output of the ebtables rules.
5# Similar to iptables-save.
6#
7# It can be used to store active configuration to /etc/sysconfig/ebtables
8
9use strict;
10my $table;
11my $ebtables = "__EXEC_PATH__/ebtables";
12my $cnt = "";
13my $version = "1.0";
14my $table_name;
15
16# ========================================================
17# Process filter table
18# ========================================================
19sub process_table {
20    my $chain = "";
21    my $rules = "";
22    my $chains = "";
23    my $line = "";
24
25    foreach $line (split("\n",$_[0])) {
26        if ($line =~ m/Bridge table: (.*)/) {
27            print "*$1\n";
28            next;
29        }
30        if ($line =~ m/Bridge chain: (.*?), entries:.* policy: (.*)/) {
31            $chains = $chains . ":$1 $2\n";
32            $chain = $1;
33            next;
34        }
35        if ($line =~ m/^$/) {
36            next;
37        }
38        if ($cnt eq "--Lc") {
39            $line =~ s/, pcnt = (.*) -- bcnt = (.*)/-c $1 $2/;
40        } else {
41            $line =~ s/ $//;
42        }
43        $rules = $rules . "-A $chain $line\n";
44    }
45
46    print $chains;
47    print $rules;
48    print "\n";
49}
50# ========================================================
51
52unless (-x $ebtables) { exit -1 };
53print "# Generated by ebtables-save v$version on " . `date`;
54if (defined($ENV{'EBTABLES_SAVE_COUNTER'}) && $ENV{'EBTABLES_SAVE_COUNTER'} eq "yes") {
55    $cnt = "--Lc";
56}
57foreach $table_name (split("\n", `grep -E '^ebtable_' /proc/modules | cut -f1 -d' ' | sed s/ebtable_//`)) {
58    $table =`$ebtables -t $table_name -L $cnt`;
59    unless ($? == 0) { print $table; exit -1 };
60    &process_table($table);
61}
62