Change vyatta_net_name into a perl script

Use existing config parser and perl to handle udev device naming.
Do renaming early in udev boot, and fixup config file later.
This avoids rescanning udev devices on boot and adds preliminary
support for hotplug.

1 files changed, 137 insertions, 0 deletions

diff --git a/scripts/system/vyatta_interface_rescan b/scripts/system/vyatta_interface_rescan
new file mode 100755
index 00000000..62d550bf
--- /dev/null
+++ b/scripts/system/vyatta_interface_rescan
@@ -0,0 +1,137 @@
+#! /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 $mac = shift;
+
+    # is local assignment bit (IEEE802) not set?
+    return 1 unless ($mac =~ /^.[2367abef]:/);
+
+    # is address bogus?
+    return if ($mac eq '00:00:00:00:00:00');
+
+    # 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 $hwaddr;
+}
+
+# vyatta_net_name leaves files in /dev/.udev/vyatta
+#  the filename is the interface and the contents are the hardware id
+sub interface_rescan {
+    my ($VYATTAUDEV, $BOOTFILE) = @_;
+
+    # parse existing config
+    my $xcp = new XorpConfigParser();
+    $xcp->parse($BOOTFILE);
+
+    opendir( my $dir, $VYATTAUDEV )
+	or die "Can't open $VYATTAUDEV : $!";
+
+    foreach my $ifname (grep { ! /^\./ } readdir($dir)) {
+	my $ifpath = interface_type($ifname) . " $ifname";
+	if ($xcp->get_node(['interfaces', $ifpath])) {
+	    syslog(LOG_INFO, "%s: is already in config file", $ifname);
+	    next;
+	}
+
+	my $hwaddr = get_hwid("$VYATTAUDEV/$ifname");
+	unless (persistent_address($hwaddr)) {
+	    syslog(LOG_INFO, "%s: skipping address %s is not persistent",
+		   $ifname, $hwaddr);
+	    next;
+	}
+
+	# Add new entry to config
+	syslog(LOG_INFO, "add config for %s hw-id %s", $ifname, $hwaddr);
+	$xcp->create_node(['interfaces',$ifpath,"hw-id $hwaddr"]);
+    }
+
+    # 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;
+