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#!/usr/bin/perl -w
#
# Module: vyatta-wanloadbalance.pl
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 as published
# by the Free Software Foundation.
#
# **** End License ****
#
use lib "/opt/vyatta/share/perl5/";
use VyattaConfig;
use VyattaMisc;
use VyattaTypeChecker;
use warnings;
use strict;
use POSIX;
use File::Copy;
sub write_health {
#open conf
my $config = new VyattaConfig;
my $valid = "false";
$config->setLevel("load-balancing wan interface-health");
my @eths = $config->listNodes();
print FILE_LCK "health {\n";
foreach my $ethNode (@eths) {
print FILE_LCK "\tinterface " . $ethNode . " {\n";
my $option = $config->returnValue("$ethNode failure-count");
if (defined $option) {
print FILE_LCK "\t\tfailure-ct " . $option . "\n";
}
$option = $config->returnValue("$ethNode ping");
if (defined $option) {
print FILE_LCK "\t\ttarget " . $option . "\n";
$valid = "true";
}
$option = $config->returnValue("$ethNode resp-time");
if (defined $option) {
print FILE_LCK "\t\tping-resp " . $option*1000 . "\n";
}
$option = $config->returnValue("$ethNode success-count");
if (defined $option) {
print FILE_LCK "\t\tsuccess-ct " . $option . "\n";
}
$option = $config->returnValue("$ethNode nexthop");
if (defined $option) {
print FILE_LCK "\t\tnexthop " . $option . "\n";
}
print FILE_LCK "\t}\n";
}
print FILE_LCK "}\n\n";
if ($valid eq "false") {
print "A valid WAN load-balance configuration requires an interface with a ping target\n";
}
return $valid;
}
sub write_rules {
my $config = new VyattaConfig;
my $valid = "false";
$config->setLevel('load-balancing wan rule');
my @rules = $config->listNodes();
#destination
foreach my $rule (@rules) {
print FILE_LCK "rule " . $rule . " {\n";
$config->setLevel('load-balancing wan rule');
my $protocol = $config->returnValue("$rule protocol");
if (defined $protocol) {
print FILE_LCK "\tprotocol " . $protocol . "\n"
}
else {
$protocol = "";
}
#destination
print FILE_LCK "\tdestination {\n";
my $daddr = $config->returnValue("$rule destination address");
if (defined $daddr) {
if (VyattaTypeChecker::validate_iptables4_addr($daddr) eq "1") {
print FILE_LCK "\t\taddress \"" . $daddr . "\"\n";
}
else {
print "Error in destination address configuration\n";
exit 1;
}
}
my $option = $config->returnValue("$rule destination port");
if (defined $option) {
my $can_use_port;
my $port_str;
my $port_err;
if ($protocol eq "tcp" || $protocol eq "udp") {
$can_use_port = "yes";
}
($port_str, $port_err) = VyattaMisc::getPortRuleString($option, $can_use_port, "d", $protocol);
if (defined $port_str) {
print FILE_LCK "\t\tport-ipt \"" . $port_str . "\"\n";
}
else {
print $port_err;
exit 1;
}
}
print FILE_LCK "\t}\n";
#source
$config->setLevel('load-balancing wan rule');
print FILE_LCK "\tsource {\n";
my $saddr = $config->returnValue("$rule source address");
if (defined $saddr) {
if (VyattaTypeChecker::validate_iptables4_addr($saddr) eq "1") {
print FILE_LCK "\t\taddress \"" . $saddr . "\"\n";
}
else {
print "Error in source address configuration\n";
exit 1;
}
}
$option = $config->returnValue("$rule source port");
if (defined $option) {
my $can_use_port;
my $port_str;
my $port_err;
if ($protocol eq "tcp" || $protocol eq "udp") {
$can_use_port = "yes";
}
($port_str, $port_err) = VyattaMisc::getPortRuleString($option, $can_use_port, "d", $protocol);
if (defined $port_str) {
print FILE_LCK "\t\tport-ipt \"" . $port_str . "\"\n";
}
else {
print $port_err;
exit 1;
}
}
print FILE_LCK "\t}\n";
#inbound-interface
$option = $config->returnValue("$rule inbound-interface");
if (defined $option) {
print FILE_LCK "\tinbound-interface " . $option . "\n"
}
#interface
$config->setLevel("load-balancing wan rule $rule interface");
my @eths = $config->listNodes();
foreach my $ethNode (@eths) {
$valid = "true";
print FILE_LCK "\tinterface " . $ethNode . " {\n";
$option = $config->returnValue("$ethNode weight");
if (defined $option) {
print FILE_LCK "\t\tweight " . $option . "\n";
}
print FILE_LCK "\t}\n";
}
print FILE_LCK "}\n";
}
if ($valid eq "false") {
print "At least one rule with interface must be defined for WAN load balancing to be active\n";
#allow this configuration, just generate the warning
return "true";
}
return $valid;
}
####main
my $conf_file = '/var/load-balance/wlb.conf';
my $conf_lck_file = '/var/load-balance/wlb.conf.lck';
#open file
open(FILE, "<$conf_file") or die "Can't open wlb config file";
open(FILE_LCK, "+>$conf_lck_file") or die "Can't open wlb lock file";
my $success = write_health();
if ($success eq "false") {
exit 1;
}
$success = write_rules();
if ($success eq "false") {
exit 1;
}
close FILE;
close FILE_LCK;
copy ($conf_lck_file,$conf_file);
unlink($conf_lck_file);
#finally kick the process
system "/opt/vyatta/sbin/vyatta-wanloadbalance.init restart $conf_file 2>/dev/null";
exit 0;
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