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#!/usr/bin/perl
use FindBin qw($Bin);
require "$Bin/json_pp.pm";
use Data::Dumper;
use strict;
sub create_state() {
return {
route => {},
ipaddr => {},
};
}
sub cmd($) {
my $cmd = shift;
print STDERR "command: $cmd\n";
system($cmd);
}
sub fetch_active_data_linux($$) {
my $ifname = shift;
my $data = shift;
open DATA, "(ip -4 r s dev $ifname; ip -6 r s dev $ifname) |";
while (<DATA>) {
chomp;
s/^\s+//;
my @data = split /\s+/, $_;
next if $data[0] =~ /^fe80:/;
next if $data[0] =~ /^ff..:/;
$data[0] =~ /(:|\/)/ or do {
$data[0] .= '/32';
};
$data->{route}->{$data[0]} = 'delete';
}
close DATA;
open DATA, "ip a s dev $ifname |";
while (<DATA>) {
chomp;
s/^\s+//;
my @data = split /\s+/, $_;
next unless $data[0] =~ /inet/;
next if $data[1] =~ /^fe80:/;
$data->{ipaddr}->{$data[1]} = 'delete';
}
close DATA;
}
sub fetch_active_data_darwin($$) {
my $ifname = shift;
my $data = shift;
open DATA, "netstat -rn |";
while (<DATA>) {
chomp;
s/^\s+//;
my @data = split /\s+/, $_;
next unless $data[3] eq $ifname;
next if $data[0] =~ /^fe80:/;
next if $data[0] =~ /^ff..:/;
$data[0] =~ /(:|\/)/ or do {
my $mask = 32;
my @addr = split /\./, $data[0];
while (@addr < 4) {
push @addr, '0';
$mask -= 8;
}
$data[0] = join(".", @addr)."/$mask";
};
$data->{route}->{$data[0]} = 'delete';
}
close DATA;
open DATA, "ifconfig $ifname |";
while (<DATA>) {
chomp;
s/^\s+//;
my @data = split /\s+/, $_;
next unless $data[0] =~ /inet/;
next if $data[1] =~ /^fe80:/;
$data->{ipaddr}->{$data[1]} = 'delete';
}
close DATA;
}
sub update_data($$$) {
my $data = shift;
my $delete = shift;
my $add = shift;
return unless $data->{"link-up"} eq 1;
foreach my $val (@{$data->{ipaddr}}, @{$data->{ip6addr}}) {
my $ip = $val->{ipaddr};
my $mask = $val->{mask};
if ($ip =~ /:/) {
my $route = $ip;
if (not($ip =~ /::/) and $mask eq 64) {
$route =~ s/((\w+):(\w+):(\w+):(\w+)):.*/$1::/;
} else {
$route = "$ip/128";
}
push @{$data->{routes6}}, { target => "$route", "netmask" => $mask };
} else {
push @{$data->{routes}}, { target => "$ip", "netmask" => 32 };
};
if ($delete->{ipaddr}->{$ip}) {
delete $delete->{ipaddr}->{$ip};
} elsif ($delete->{ipaddr}->{"$ip/$mask"}) {
delete $delete->{ipaddr}->{"$ip/$mask"};
} else {
$add->{ipaddr}->{"$ip/$mask"} = 'add';
}
}
foreach my $val (@{$data->{routes}}, @{$data->{routes6}}) {
my $ip = $val->{target}.'/'.$val->{netmask};
if ($delete->{route}->{$ip}) {
delete $delete->{route}->{$ip};
} else {
$add->{route}->{$ip} = 'add';
}
}
}
sub set_active_data_linux($$$) {
my $ifname = shift;
my $delete = shift;
my $add = shift;
(keys %{$add->{ipaddr}}, keys %{$add->{route}}) > 0 and cmd("ip l s dev $ifname up");
foreach my $ip (keys %{$delete->{ipaddr}}) {
cmd("ip a d $ip dev $ifname");
}
foreach my $route (keys %{$delete->{route}}) {
cmd("ip r d $route dev $ifname");
}
foreach my $ip (keys %{$add->{ipaddr}}) {
cmd("ip a a $ip dev $ifname");
}
foreach my $route (keys %{$add->{route}}) {
cmd("ip r a $route dev $ifname");
}
}
sub set_active_data_darwin($$$) {
my $ifname = shift;
my $delete = shift;
my $add = shift;
foreach my $ip (keys %{$delete->{ipaddr}}) {
$ip =~ s/\/.*//;
if ($ip =~ /:/) {
cmd("ifconfig $ifname inet6 delete $ip");
} else {
cmd("ifconfig $ifname delete $ip");
}
}
foreach my $route (keys %{$delete->{route}}) {
if ($route =~ /:/) {
cmd("route delete -inet6 $route -iface $ifname");
} else {
cmd("route delete -inet $route -iface $ifname");
}
}
foreach my $ip (keys %{$add->{ipaddr}}) {
my @ip = split /\//, $ip;
if ($ip[0] =~ /:/) {
cmd("ifconfig $ifname inet6 add $ip[0] prefixlen $ip[1]");
} else {
cmd("ifconfig $ifname add $ip[0]/$ip[1] $ip[0]");
}
}
foreach my $route (keys %{$add->{route}}) {
if ($route =~ /:/) {
cmd("route add -inet6 $route -iface $ifname");
} else {
cmd("route add -inet $route -iface $ifname");
}
}
}
my $json = $ARGV[0];
my $platform = `uname`;
my $data = JSON::PP::decode_json($json) or die "Failed to decode JSON data\n";
foreach my $round (1 .. 2) {
my $delete = create_state();
my $add = create_state();
if ($platform =~ /Darwin/) {
fetch_active_data_darwin($data->{ifname}, $delete);
} elsif ($platform =~ /Linux/) {
fetch_active_data_linux($data->{ifname}, $delete);
} else {
die "Unsupported platform $platform\n";
}
update_data($data, $delete, $add);
if ($platform =~ /Darwin/) {
set_active_data_darwin($data->{ifname}, $delete, $add);
} elsif ($platform =~ /Linux/) {
set_active_data_linux($data->{ifname}, $delete, $add);
}
}
# print Data::Dumper->Dump([$add, $delete], ["add", "delete"])."\n";
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