#
# Module: VyattaKeepalived.pm
# 
# **** License ****
# 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) 2007-2009 Vyatta, Inc.
# All Rights Reserved.
# 
# Author: Stig Thormodsrud
# Date: October 2007
# Description: Common keepalived definitions/funcitions
# 
# **** End License ****
#
package Vyatta::Keepalived;
use strict;
use warnings;

our @EXPORT = qw(get_conf_file get_state_script get_state_file 
                 vrrp_log vrrp_get_init_state get_changes_file
                 start_daemon restart_daemon stop_daemon
                 vrrp_get_config list_vrrp_intf list_vrrp_group
                 list_vrrp_sync_group list_all_vrrp_sync_grps);
use base qw(Exporter);

use Vyatta::Config;
use Vyatta::Interface;
use Vyatta::Misc;
use POSIX;

my $daemon           = '/usr/sbin/keepalived';
my $keepalived_conf  = '/etc/keepalived/keepalived.conf';
my $sbin_dir         = '/opt/vyatta/sbin';
my $state_transition = "$sbin_dir/vyatta-vrrp-state.pl";
my $keepalived_pid   = '/var/run/keepalived_vrrp.pid';
my $state_dir        = '/var/run/vrrpd';
my $vrrp_log         = "$state_dir/vrrp.log";
my $changes_file     = "$state_dir/changes";

sub vrrp_log {
    my $timestamp = strftime("%Y%m%d-%H:%M.%S", localtime);
    open my $fh, '>>', $vrrp_log
	or die "Can't open $vrrp_log:$!";
    print $fh "$timestamp: ", @_ , "\n";
    close $fh;
}

sub is_running {
    if (-f $keepalived_pid) {
	my $pid = `cat $keepalived_pid`;
	$pid =~ s/\s+$//;  # chomp doesn't remove nl
	my $ps = `ps -p $pid -o comm=`;

	if (defined($ps) && $ps ne "") {
	    return 1;
	} 
    }
    return 0;
}

sub start_daemon {
    my ($conf) = @_;

    my $cmd  = "$daemon --vrrp --log-facility 7 --log-detail --dump-conf";
       $cmd .= " --use-file $conf --vyatta-workaround";
    system($cmd);
    vrrp_log("start_daemon");
}

sub stop_daemon {
    if (is_running()) {
	my $pid = `cat $keepalived_pid`;
	$pid =~ s/\s+$//;  # chomp doesn't remove nl
	system("kill $pid");
	vrrp_log("stop_daemon");
    } else {
	vrrp_log("stop daemon called while not running");
    }
}

sub restart_daemon {
    my ($conf) = @_;

    if (is_running()) {
	my $pid = `cat $keepalived_pid`;
	$pid =~ s/\s+$//;  # chomp doesn't remove nl
	system("kill -1 $pid");
	vrrp_log("restart_deamon");
    } else {
	start_daemon($conf);	
    }    
}

sub get_conf_file {
    return $keepalived_conf;
}

sub get_state_script {
    return $state_transition;
}

sub get_changes_file {
    system("mkdir $state_dir") if ! -d $state_dir;
    return $changes_file;
}

sub get_state_file {
    my ($vrrp_intf, $vrrp_group) = @_;

    system("mkdir $state_dir") if ! -d $state_dir;
    my $file = "$state_dir/vrrpd_" . "$vrrp_intf" . "_" . "$vrrp_group.state";
    return $file;
}

sub get_master_file {
    my ($vrrp_intf, $vrrp_group) = @_;

    my $file = "$state_dir/vrrpd_" . "$vrrp_intf" . "_" . "$vrrp_group.master";
    return $file;
}

sub alphanum_split {
    my ($str) = @_;
    my @list = split m/(?=(?<=\D)\d|(?<=\d)\D)/, $str;
    return @list;
}

sub natural_order {
    my ($a, $b) = @_;
    my @a = alphanum_split($a);
    my @b = alphanum_split($b);
  
    while (@a && @b) {
	my $a_seg = shift @a;
	my $b_seg = shift @b;
	my $val;
	if (($a_seg =~ /\d/) && ($b_seg =~ /\d/)) {
	    $val = $a_seg <=> $b_seg;
        } elsif (($a_seg eq '.') && ($b_seg eq '_')) {
            return 1;
	} else {
	    $val = $a_seg cmp $b_seg;
	}
	if ($val != 0) {
	    return $val;
	}
    }
    return @a <=> @b;
}

sub intf_sort {
    my @a = @_;
    my @new_a = sort { natural_order($a,$b) } @a;
    return @new_a;
}

sub get_state_files {
    my ($intf, $group) = @_;

    opendir my $sdir, $state_dir
	or die "Can't open $state_dir: $!\n";

    my @state_files;
    if ($group eq "all") {
	@state_files = grep { /^vrrpd_$intf.*\.state$/ } readdir($sdir);
    } else {
	my $intf_group = $intf . "_" . $group . ".state";
	@state_files = grep { /^vrrpd_$intf_group$/ } readdir($sdir);
    }
    close $sdir;

    @state_files = intf_sort(@state_files);
    foreach my $i (0 .. $#state_files) {
	$state_files[$i] = "$state_dir/$state_files[$i]";
    }
    chomp  @state_files;
    return @state_files;
}

sub vrrp_get_config {
    my ($intf, $group) = @_;

    my $path;
    my $config = new Vyatta::Config;

    my $interface = new Vyatta::Interface($intf);
    die "Unknown interface type: $intf" unless $interface;
 
    $path = $interface->path();
    $config->setLevel($path);
    my $primary_addr = $config->returnOrigValue("address"); 
    if (!defined $primary_addr) {
	$primary_addr = "0.0.0.0";
    }
    if ($primary_addr =~ m/(\d+\.\d+\.\d+\.\d+)\/\d+/) {
	$primary_addr = $1;  # strip /mask
    }

    $config->setLevel("$path vrrp vrrp-group $group");
    my $source_addr = $config->returnOrigValue("hello-source-address"); 
    $primary_addr = $source_addr if defined $source_addr;

    my @vips = $config->returnOrigValues("virtual-address");
    my $priority = $config->returnOrigValue("priority");
    if (!defined $priority) {
	$priority = 1;
    }
    my $preempt = $config->returnOrigValue("preempt");
    if (!defined $preempt) {
	$preempt = "true";
    }
    my $advert_int = $config->returnOrigValue("advertise-interval");
    if (!defined $advert_int) {
	$advert_int = 1;
    }
    $config->setLevel("$path vrrp vrrp-group $group authentication");
    my $auth_type = $config->returnOrigValue("type");
    if (!defined $auth_type) {
	$auth_type = "none";
    } 

    return ($primary_addr, $priority, $preempt, $advert_int, $auth_type, @vips);
}

sub snoop_for_master {
    my ($intf, $group, $vip, $timeout) = @_;

    my ($cap_filt, $dis_filt, $options, $cmd);

    my $file = get_master_file($intf, $group);

    # remove mask if vip has one
    if ($vip =~ /([\d.]+)\/\d+/) {
	$vip = $1;
    }

    #
    # set up common tshark parameters
    #
    $cap_filt = "-f \"host 224.0.0.18";
    $dis_filt = "-R \"vrrp.virt_rtr_id == $group and vrrp.ip_addr == $vip\""; 
    $options  = "-a duration:$timeout -p -i$intf -c1 -T pdml";

    my $auth_type = (vrrp_get_config($intf, $group))[4];
    if (lc($auth_type) ne "ah") {
	#
	# the vrrp group is the 2nd byte in the vrrp header
	#
	$cap_filt .= " and proto VRRP and vrrp[1:1] = $group\"";
	$cmd      = "tshark $options $cap_filt $dis_filt";
	system("$cmd > $file 2> /dev/null");
    } else {
	#
	# if the vrrp group is using AH authentication, then the proto will be
	# AH (0x33) instead of VRRP (0x70). So try snooping for AH and 
	# look for the vrrp group at byte 45 (ip_header=20, ah=24)
	#
	$cap_filt .= " and proto 0x33 and ip[45:1] = $group\"";
	$cmd      = "tshark $options $cap_filt $dis_filt";
	system("$cmd > $file 2> /dev/null");
    }
}

sub vrrp_state_parse {
    my ($file) = @_;

    $file =~ s/\s+$//;  # chomp doesn't remove nl
    if ( -f $file) {
	my $line = `cat $file`;
	chomp $line;
	my ($start_time, $intf, $group, $state, $ltime) = split(' ', $line);
	return ($start_time, $intf, $group, $state, $ltime);
    } 
    # else return undefined
}

sub vrrp_get_init_state {
    my ($intf, $group, $vips, $preempt) = @_;

    my $init_state;
    if (is_running()) {
	my @state_files = get_state_files($intf, $group);
	chomp @state_files;
	if (scalar(@state_files) > 0) {
	    my ($start_time, $f_intf, $f_group, $state, $ltime) = 
		vrrp_state_parse($state_files[0]);
	    if ($state eq "master") {
		$init_state = 'MASTER';
	    } else {
		$init_state = 'BACKUP';
	    }
	    return $init_state;
	}
	# fall through to logic below
    } 

    # start as backup by default
    $init_state = 'BACKUP';

    return $init_state;
}

sub list_vrrp_intf {
    my ($val_func) = @_;
    my $config = new Vyatta::Config;
    my @intfs = ();

    foreach my $name ( getInterfaces() ) {
        my $intf = new Vyatta::Interface($name);
        next unless $intf;
        my $path = $intf->path();
        $config->setLevel($path);
        if (defined $val_func) {
          push @intfs, $name if $config->$val_func("vrrp");
        } else {
          push @intfs, $name if $config->existsOrig("vrrp");
        }
    }

    return @intfs;
}

sub list_vrrp_group {
    my ($name, $val_func) = @_;
    my $config = new Vyatta::Config;
    my $path;

    my $intf = new Vyatta::Interface($name);
    next unless $intf;
    $path = $intf->path();
    $path .= " vrrp vrrp-group";
    $config->setLevel($path);
    my @groups = ();
    if (defined $val_func) {
      @groups = $config->$val_func();
    } else {
      @groups = $config->listOrigNodes();
    }
    return @groups;
}

sub list_vrrp_sync_group {
    my ($name, $group, $val_func) = @_;
    my $config = new Vyatta::Config;
    my $path;

    my $intf = new Vyatta::Interface($name);
    next unless $intf;
    $path = $intf->path();
    $path .= " vrrp vrrp-group $group sync-group";
    $config->setLevel($path);
    my $sync_group = undef;
    if (defined $val_func) {
      $sync_group = $config->$val_func();
    } else {
      $sync_group = $config->returnOrigValue();
    }
    return $sync_group;
}

sub list_all_vrrp_sync_grps {
  my @sync_grps = ();
  my @vrrp_intfs = list_vrrp_intf();
  foreach my $vrrp_intf (@vrrp_intfs) {
    my @vrrp_groups = list_vrrp_group($vrrp_intf);
    foreach my $vrrp_group (@vrrp_groups) {
      my $sync_grp = list_vrrp_sync_group($vrrp_intf, $vrrp_group);
      if (defined $sync_grp) {
        # add to sync_grps if not already there
	if (scalar( grep( /^$sync_grp$/, @sync_grps ) ) == 0) {
	  push (@sync_grps, $sync_grp);
	}
      }
    }
  }
  return @sync_grps;
}

1;
#end of file