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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.
use strict;
use lib "/opt/vyatta/share/perl5/";
use XorpConfigParser;
use Vyatta::Config;
use Sys::Syslog qw(:standard :macros);
use Fcntl qw(:flock);
my $BOOTFILE = "/opt/vyatta/etc/config/config.boot";
my $UDEVDIR = "/dev/.udev";
my $VYATTAUDEV = $UDEVDIR . "/vyatta";
my $LOCKFILE = $UDEVDIR . "/.vyatta-lock";
my $VYATTACFG = "/opt/vyatta/config/active";
# Check if interface name is free to use
sub is_available {
my ($interfaces, $ifname) = @_;
my $count = grep { $_ eq $ifname } values %$interfaces;
return ($count == 0);
}
# Find next available interface name
sub find_available {
my ($interfaces, $ifprefix) = @_;
$ifprefix =~ s/\d+$//;
for (my $id = 0; ; $id++) {
my $ifname = sprintf("%s%d", $ifprefix, $id);
# is it in Vyatta config?
return $ifname if (is_available($interfaces, $ifname));
}
}
# Find the hardware id in the parsed config node for interface
sub get_hwid_from_children {
my $children = shift;
foreach my $attr (@$children) {
next unless ($attr->{'name'} =~ /^hw-id ([0-9a-f:]+)/);
return $1;
}
return; # not found
}
# Leave file for vyatta_interface_rescan
sub leave_rescan_hint {
my ($ifname, $hwaddr) = @_;
my $name = "$VYATTAUDEV/$ifname";
mkdir($VYATTAUDEV);
open (my $f, '>', $name)
or die "Can't create $name : $!";
print {$f} "$hwaddr\n";
close $f;
return 1;
}
# Use biosdevname program (ethernet only)
# to try and find name based on PCI slot and DMI info
sub biosdevname {
my $ifname = shift;
# biosdevname renames wlanX to ethX ??
if ($ifname =~ /^eth/) {
my $biosname = `/sbin/biosdevname --policy all_ethN -i $ifname`;
chomp $biosname;
return $biosname if ($biosname ne '');
}
return $ifname; # Fallback to existing name
}
# Determine network name to use based on Vyatta config during boot
sub coldplug {
my ($ifname, $hwaddr) = @_;
my $xcp = new XorpConfigParser();
$xcp->parse($BOOTFILE);
my $interfaces = { };
my $inode = $xcp->get_node(['interfaces']);
if ($inode) {
foreach my $child (@{$inode->{'children'}}) {
next unless ($child->{'name'} =~ /^ethernet (.*)|^wireless (.*)/);
my $intf = $1;
my $hwid = get_hwid_from_children($child->{'children'});
next unless $hwid;
# TBD this could be a hash with name and path?
$interfaces->{$hwid} = $intf;
}
}
# is name already in config file
my $newname = $interfaces->{$hwaddr};
return $newname if ($newname);
# add already assigned names
if (opendir(my $dir, $VYATTAUDEV)) {
foreach my $intf (grep { ! /^\./ } readdir($dir)) {
if (open (my $f, '<', "$VYATTAUDEV/$intf")) {
my $hwid = <$f>;
close $f;
chomp $hwid;
$interfaces->{$hwid} = $intf;
}
}
}
$newname = biosdevname($ifname);
unless (is_available($interfaces, $newname)) {
$newname = find_available($interfaces, $newname);
}
leave_rescan_hint($newname, $hwaddr);
return $newname;
}
# Determine name from active config
sub hotplug {
my ($ifname, $hwaddr) = @_;
openlog("vyatta-net-name", "", LOG_DAEMON);
# Parse active config
my $cfg = new Vyatta::Config;
$cfg->setLevel('interfaces');
my $interfaces = {};
foreach my $type ($cfg->listOrigNodes()) {
next unless ($type eq 'ethernet') || ($type eq 'wireless');
foreach my $intf ($cfg->listOrigNodes($type)) {
my $hwid = $cfg->returnOrigValue("$type $intf hw-id");
next unless $hwid;
# TBD this could be a hash with name and path?
$interfaces->{$hwid} = $intf;
}
}
my $newname = $interfaces->{$hwaddr};
return $newname if ($newname);
$newname = biosdevname($ifname);
unless (is_available($interfaces, $newname)) {
$newname = find_available($interfaces, $newname);
}
syslog(LOG_INFO, "new name for '%s' is '%s'", $ifname, $newname);
return $newname;
}
my $LOCKF;
sub lock_file {
open ($LOCKF, '>', $LOCKFILE)
or die "Can't open $LOCKFILE : $!";
flock ($LOCKF, LOCK_EX)
or die "Can't lock $LOCKFILE : $!";
}
sub unlock_file {
close $LOCKF;
$LOCKF = undef;
}
# This script is called from udev with two arguments
# it outputs the new name (if any) to stdout
if ($#ARGV != 1) {
die "vyatta_net_name called with wrong args(%d) : %s",
$#ARGV, join(' ', @ARGV);
}
my $ifname = $ARGV[0];
my $hwaddr = $ARGV[1];
lock_file;
my $newname;
if ( -d $VYATTACFG ) {
$newname = hotplug($ifname, $hwaddr);
} else {
$newname = coldplug($ifname, $hwaddr);
}
unlock_file;
print "$newname\n" if ($newname);
exit 0;
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