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#!/usr/bin/perl
use Getopt::Long;
use strict;
my ($iface, $dhcp, $route, $table, $nip, $oip, $nrouters, $orouters, $reason);
GetOptions("interface=s" => \$iface,
"dhcp=s" => \$dhcp,
"route=s" => \$route,
"table=s" => \$table,
"new_ip=s" => \$nip,
"old_ip=s" => \$oip,
"new_routers=s" => \$nrouters,
"old_routers=s" => \$orouters,
"reason=s" => \$reason);
# check if an update is needed
if (($reason eq "BOUND") || ($reason eq "REBOOT")) {
$oip = "";
$orouters = "";
}
exit(0) if (($iface ne $dhcp) || (($oip eq $nip) && ($orouters eq $nrouters)));
logger("DHCP address on $iface updated to $nip,$nrouters from $oip,$orouters: Updating static route $route in table $table.");
my $tab;
if ($table eq "main") {
$tab = "";
}
else {
$tab = "table $table";
}
if ($orouters ne $nrouters) {
if ($orouters ne "") {
system("vtysh -c 'configure terminal' -c 'no ip route $route $orouters $tab' ");
}
if (($nrouters ne "") && ($nrouters ne "127.0.0.1")) {
system("vtysh -c 'configure terminal' -c 'ip route $route $nrouters $tab' ");
}
}
if (($oip ne $nip) && ($table ne "main") && ($route eq "0.0.0.0/0")) {
my $mark = 0x7fffffff + $table;
if ($oip ne "") {
system("sudo /sbin/iptables -t mangle -D OUTPUT -s $oip/32 -j MARK --set-mark $mark");
}
if (($nip ne "") && ($nip ne "127.0.0.1")) {
system("sudo /sbin/iptables -t mangle -D OUTPUT -s $nip/32 -j MARK --set-mark $mark");
system("sudo /sbin/iptables -t mangle -I OUTPUT -s $nip/32 -j MARK --set-mark $mark");
}
}
sub logger {
my $msg = pop(@_);
my $FACILITY = "daemon";
my $LEVEL = "notice";
my $TAG = "tunnel-dhclient-hook";
my $LOGCMD = "logger -t $TAG -p $FACILITY.$LEVEL";
system("$LOGCMD $msg");
}
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