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#! /usr/bin/perl
# 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.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2010 Vyatta, Inc.
# All Rights Reserved.
# Thus updates the configuration to add new interfaces.
# It is run on boot after udev and before vyatta configuration.
use strict;
use lib "/opt/vyatta/share/perl5/";
use Sys::Syslog qw(:standard :macros);
use XorpConfigParser;
use File::Copy;
my $TMPFILE = "/tmp/config.boot.$$";
# These vendors are known to violate the local MAC address assignment convention
my %whitelist = (
'02:07:01' => 'Interlan',
'02:60:60' => '3Com',
'02:60:8c' => '3Com',
'02:a0:c9' => 'Intel',
'02:aa:3c' => 'Olivetti',
'02:cf:1f' => 'CMC',
'02:e0:3b' => 'Prominet',
'02:e6:d3' => 'BTI',
'52:54:00' => 'Realtek',
'52:54:4c' => 'Novell 2000',
'52:54:ab' => 'Realtec',
'e2:0c:0f' => 'Kingston Technologies',
);
# Ignore devices with local assigned or invalid mac address,
# these devices don't have a persistent address
sub persistent_address {
my $mac = shift;
return if ($mac eq '00:00:00:00:00:00'); # zero address is reserved
# get first octet
return unless ($mac =~ /^([0-9a-f][0-9a-f]):/);
my $oct0 = hex($1);
return if ($oct0 & 0x1); # skip it is a multicast address
return 1 unless ($oct0 & 0x2); # this is good, not locally assigned
return 1 if ( -d '/proc/xen' ); # workaround Xen breakage
# unless it is in whitelist, it is non persistent
$mac =~ /^([0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f])/;
return $whitelist{$1};
}
# Map from eth0 to ethernet
# TODO make smarter if more types
sub interface_type {
my $ifname = shift;
return "ethernet" if ($ifname =~ /^eth/);
return "wireless" if ($ifname =~ /^wlan/);
die "unknown interface name %s\n", $ifname;
}
sub get_hwid {
my $name = shift;
open (my $f, '<', $name)
or die "Can't open $name : $!";
my $hwaddr = <$f>;
chomp $hwaddr;
close $f;
return $hwaddr;
}
# Determine phy for wlan device
# (This is ugly)
sub get_phy {
my $wlan = shift;
my $phypath = "/sys/class/net/$wlan/phy80211";
# link should be: ../../ieee80211/phy0
return unless (readlink($phypath) =~ m!../../ieee80211/(phy[0-9]+)$!);
return $1;
}
# vyatta_net_name leaves files in /run/udev/vyatta
# the filename is the interface and the contents are the hardware id
sub interface_rescan {
my ($VYATTAUDEV, $BOOTFILE) = @_;
# parse existing config
my $xcp = new XorpConfigParser();
$xcp->parse($BOOTFILE);
# get list of changed interfaces
opendir( my $dir, $VYATTAUDEV )
or die "Can't open $VYATTAUDEV : $!";
my @interfaces = grep { ! /^\./ } readdir($dir);
close $dir;
foreach my $ifname (sort @interfaces) {
my $hwaddr = get_hwid("$VYATTAUDEV/$ifname");
# Ignore devices that disappear (or get renamed)
unless (-d "/sys/class/net/$ifname") {
syslog(LOG_INFO, "%s: does not exist", $ifname);
next;
}
unless (persistent_address($hwaddr)) {
syslog(LOG_NOTICE, "%s: skipping address %s is not persistent",
$ifname, $hwaddr);
next;
}
# Add new entry to config
my $ifpath = interface_type($ifname) . " $ifname";
syslog(LOG_INFO, "add config for %s hw-id %s", $ifname, $hwaddr);
$xcp->create_node(['interfaces',$ifpath,"hw-id $hwaddr"]);
# Add existing phy entry for wireless
if ($ifname =~ /^wlan/) {
my $phy = get_phy($ifname);
$xcp->create_node(['interfaces',$ifpath,"physical-device $phy"]) if $phy;
}
}
# Rewrite new config file
open (my $tmp, '>', $TMPFILE)
or die "Can't open $TMPFILE : $!";
select $tmp;
$xcp->output(0);
select STDOUT;
close $tmp;
copy($TMPFILE, $BOOTFILE)
or die "Can't copy $TMPFILE to $BOOTFILE : $!";
unlink($TMPFILE);
}
# main
die "vyatta_interface_rescan called with wrong args"
unless ($#ARGV == 1);
openlog("vyatta-interface-rescan", "", LOG_DAEMON);
interface_rescan(@ARGV);
exit 0;
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