#!/usr/bin/perl

use Getopt::Std;
use IPC::Open3;
use POSIX;

my @volumes;

$_ = $0;
s/.*\///;
my $pname = $_;

# WARNING!! Do not add code bewteen "#BEGIN_VERSION_GENERATION" and
# "#END_VERSION_GENERATION"  It is generated by the Makefile

#BEGIN_VERSION_GENERATION
$FENCE_RELEASE_NAME="1.32.45";
$REDHAT_COPYRIGHT=("Copyright (C) Red Hat, Inc.  2004  All rights reserved.");
$BUILD_DATE="(built Sun Jun 17 16:24:24 CDT 2007)";
#END_VERSION_GENERATION

sub usage
{
    print "Usage\n";
    print "\n";
    print "$pname [options]\n";
    print "\n";
    print "Options\n";
    print "  -n <node>        IP address or hostname of node to fence\n";
    print "  -h               usage\n";
    print "  -V               version\n";
    print "  -v               verbose\n";

    exit 0;
}

sub version
{
    print "$pname $FENCE_RELEASE_NAME $BUILD_DATE\n";
    print "$REDHAT_COPYRIGHT\n" if ( $REDHAT_COPYRIGHT );

    exit 0;
}

sub fail
{
    ($msg)=@_;

    print $msg."\n" unless defined $opt_q;

    exit 1;
}

sub fail_usage
{
    ($msg)=@_;

    print STDERR $msg."\n" if $msg;
    print STDERR "Please use '-h' for usage.\n";

    exit 1;
}

sub get_key
{
    ($node)=@_;

    my $addr = gethostbyname($node) or die "$!\n";

    return unpack("H*", $addr);
}

sub get_node_name
{
    return $opt_n;
}

sub get_host_name
{
    my $host_name;

    my ($in, $out, $err);
    my $cmd = "cman_tool status";

    my $pid = open3($in, $out, $err, $cmd) or die "$!\n";

    waitpid($pid, 0);

    die "Unable to execute cman_tool.\n" if ($?>>8);

    while (<$out>)
    {
	chomp;
	print "OUT: $_\n" if $opt_v;

	my ($name, $value) = split(/\s*:\s*/, $_);

	if ($name eq "Node name")
	{
	    $host_name = $value;
	    last;
	}
    }

    close($in);
    close($out);
    close($err);

    return $host_name;
}

sub get_options_stdin
{
    my $opt;
    my $line = 0;

    while (defined($in = <>))
    {
	$_ = $in;
	chomp;

	# strip leading and trailing whitespace
	s/^\s*//;
	s/\s*$//;

	# skip comments
	next if /^#/;

	$line += 1;
	$opt = $_;

	next unless $opt;

	($name, $val) = split(/\s*=\s*/, $opt);

	if ($name eq "")
	{
	    print STDERR "parse error: illegal name in option $line\n";
	    exit 2;
	}
	elsif ($name eq "agent")
	{
	}
	elsif ($name eq "node")
	{
	    $opt_n = $val;
	}
	elsif ($name eq "verbose")
	{
	    $opt_v = $val;
	}
	else
	{
	    fail "parse error: unknown option \"$opt\"";
	}
    }
}

sub get_key_list
{
    ($dev) = @_;

    my ($in, $out, $err);
    my $cmd = "sg_persist -d $dev -i -k";
    my $pid = open3($in, $out, $err, $cmd) or die "$!\n";

    waitpid($pid, 0);

    die "Unable to execute sg_persist.\n" if ($?>>8);

    while (<$out>)
    {
	chomp;
	if ($_ =~ /^\s*0x/)
	{
	    s/^\s+0x//;
	    s/\s+$//;

	    my $key = sprintf("%8.8x", hex($_));
	    $key_list{$key} = 1;
	}
    }

    close($in);
    close($out);
    close($err);

    return %key_list;
}

#sub get_scsi_devices
#{
#    my ($in, $out, $err);
#    my $cmd = "lvs --noheadings --separator : -o vg_attr,devices";
#    my $pid = open3($in, $out, $err, $cmd) or die "$!\n";
#
#    waitpid($pid, 0);
#
#    die "Unable to execute lvs.\n" if ($?>>8);
#
#    while (<$out>)
#    {
#	chomp;
#	print "OUT: $_\n" if $opt_v;
#
#	my ($vg_attrs, $device) = split(/:/, $_);
#
#	if ($vg_attrs =~ /.*c$/)
#	{
#	    $device =~ s/\(.*\)//;
#	    push(@volumes, $device);
#	}
#    }
#
#    close($in);
#    close($out);
#    close($err);
#}

sub get_scsi_devices
{
    open(FILE, "/var/run/scsi_reserve") or die "$!\n";

    while (<FILE>)
    {
	chomp;
	push(@volumes, $_);
    }

    close FILE;
}

sub check_sg_persist
{
    my ($in, $out, $err);
    my $cmd = "sg_persist -V";
    my $pid = open3($in, $out, $err, $cmd) or die "$!\n";

    waitpid($pid, 0);

    die "Unable to execute sg_persist.\n" if ($?>>8);

    while (<$out>)
    {
	chomp;
	print "OUT: $_\n" if $opt_v;
    }

    close($in);
    close($out);
    close($err);
}

sub do_register
{
    ($dev, $key) = @_;

    my ($in, $out, $err);
    my $cmd = "sg_persist -d $dev -o -G -S $key";
    my $pid = open3($in, $out, $err, $cmd) or die "$!\n";

    waitpid($pid, 0);

    die "Unable to execute sg_persist.\n" if ($?>>8);

    while (<$out>)
    {
	chomp;
	print "OUT: $_\n" if $opt_v;
    }

    close($in);
    close($out);
    close($err);
}

sub fence_node
{
    my $host_name = get_host_name();
    my $node_name = get_node_name();

    my $host_key = get_key($host_name);
    my $node_key = get_key($node_name);

    my ($in, $out, $err);

    foreach $dev (@volumes)
    {
	my %key_list = get_key_list($dev);

	if (!$key_list{$host_key})
	{
	    do_register($dev, $host_key);
	}

	if ($host_key eq $node_key)
	{
	    $cmd = "sg_persist -d $dev -o -G -K $host_key -S 0";
	}
	else
	{
	    $cmd = "sg_persist -d $dev -o -A -K $host_key -S $node_key -T 5";
	}

	my $pid = open3($in, $out, $err, $cmd) or die "$!\n";

	waitpid($pid, 0);

	die "Unable to execute sg_persist.\n" if ($?>>8);

	while (<$out>)
	{
	    chomp;
	    print "OUT: $_\n" if $opt_v;
	}

	close($in);
	close($out);
	close($err);
    }
}

### MAIN #######################################################

if (@ARGV > 0) {

    getopts("n:hqvV") || fail_usage;

    usage if defined $opt_h;
    version if defined $opt_V;

    fail_usage "Unkown parameter." if (@ARGV > 0);

    fail_usage "No '-n' flag specified." unless defined $opt_n;

} else {

    get_options_stdin();

    fail "failed: missing 'node'" unless defined $opt_n;

}

check_sg_persist;

get_scsi_devices;

fence_node;

