#!/usr/bin/env perl
# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
#Note, this pping still frontends fping.  I think it would be possible to write a perl equivalent, but
#I've not had the time.  Net::Ping shows perl code I could see being adapted for a somewhat
#asynchronous ICMP ping (the tcp syn is interesting, but far too limited, and that is currently the only async 
#method Net::Ping provides.
BEGIN
{
    $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : -d '/opt/xcat' ? '/opt/xcat' : '/usr';
}
use strict;
use lib "$::XCATROOT/lib/perl";

use xCAT::Utils;
use POSIX qw(:signal_h :errno_h :sys_wait_h);
use IO::Socket::SSL;
use XML::Simple;
$XML::Simple::PREFERRED_PARSER='XML::Parser';
use Data::Dumper;
use IO::Handle;
use IO::Select;
use Getopt::Long;

my $USAGE="Usage: pping [-i|--interface interfaces] noderange
       pping -f|--use_fping
       pping -h|--help
       pping -v|--version\n"; 

my $interface;
if(!GetOptions(
      'f|use_fping'     => \$::USE_FPING,
      'h|help'     => \$::HELP,
      'v|version'  => \$::VERSION,
      'X|noexpand'  => \$::NOEXPAND,
      'interface=s' => \$interface))
	{
		print "$USAGE";
		exit 1;
	}

if ($::HELP) {  print "$USAGE"; exit 0}
if ($::VERSION) {print xCAT::Utils->Version() . "\n"; exit 0}
my $xcathost='localhost:3001';
if ($ENV{XCATHOST}) {
  $xcathost=$ENV{XCATHOST};
}

unless (@ARGV) {
    print "$USAGE";
    exit(1);
}
my $noderange = $ARGV[0];
my @nodes=();

if ($::NOEXPAND) {		# this is when ppping is calling us and has already expanded the noderange
	@nodes = split(/,/, $noderange);
}
else { 		# the normal case of the user running the cmd - expand the noderange using xcatd
	my $client = IO::Socket::SSL->new(
                PeerAddr=>$xcathost,
                SSL_key_file=> xCAT::Utils->getHomeDir()."/.xcat/client-cred.pem",
                SSL_cert_file=> xCAT::Utils->getHomeDir()."/.xcat/client-cred.pem",
                SSL_ca_file =>  xCAT::Utils->getHomeDir()."/.xcat/ca.pem",
                SSL_use_cert => 1,
                #SSL_verify_mode => 1,
             );
	die "Connection failure: $!\n" unless ($client);
	my %cmdref = (command => 'noderange', noderange => $noderange);
	$SIG{ALRM} = sub { die "No response getting noderange" };
	alarm(15);
	print $client XMLout(\%cmdref,RootName=>'xcatrequest', NoAttr=>1, KeyAttr => []);
	alarm(15);
	my $response="";
	while (<$client>) {
	  alarm(0);
	  $response .= $_;
	  if ($response =~ m/<\/xcatresponse>/) {
	    my $rsp=XMLin($response, ForceArray => ['node']);
	    $response='';
	    if ($rsp->{warning}) {
	      printf "Warning: ".$rsp->{warning}."\n";
	    }
	    if ($rsp->{error}) {
	      die ("ERROR: ".$rsp->{error}."\n");
	    } elsif ($rsp->{node}) {
	      @nodes=@{$rsp->{node}};
	    }
	    if ($rsp->{serverdone}) {
	      last;
	    }
	  }
	}
	close($client);
}	# end of else that expands the noderange using xcatd

unless (scalar(@nodes)) {
   exit 1;
}

# I think this was only needed when we forked ping ourselves
#my $children = 0;
#my $inputs = new IO::Select;
#$SIG{CHLD} = sub { while (waitpid(-1,WNOHANG) > 0) { $children--; } };

my $usenmap = (-x '/usr/bin/nmap' or -x '/usr/local/bin/nmap');
if ($::USE_FPING) { # Use fping instead of nmap
	$usenmap = 0;
}

my @interfaces;
if ($interface) { @interfaces = split(/,/, $interface); }
else { $interfaces[0] = ''; }

# Do the pings to the nodes for each interface in sequence.  We could consider doing all the interfaces
# in parallel, but then the output would get all mixed up and be confusing for the user.
foreach my $interf (@interfaces) {
	my $noderef;
	if ($interf) {
		# make a copy of the node list and add the interface on
		$noderef = [ @nodes ];
		foreach (@$noderef) { s/$/-$interf/; }
	}
	else {
		$noderef = \@nodes;		# use the original node list
	}
	
	if ($usenmap) { nmap_pping($noderef); }
	else { fping_pping($noderef); }
}

sub fping_pping {
	my $nodes = shift;
	open (FPING, "fping ".join(' ',@$nodes). " 2>&1 |") or die("Cannot open fping pipe: $!");
	while (<FPING>) {
	  if ($_ =~ /is unreachable/) {
	    s/ is unreachable/: noping/;
	  } elsif ($_ =~ /is alive/) {
	    s/ is alive/: ping/;
	  }
	  print $_;
	}
}

sub nmap_pping {
	my $nodes = shift;
    my %deadnodes;
    foreach (@$nodes) {
        $deadnodes{$_}=1;
    }
    open (FPING, "nmap -PE --system-dns --send-ip -sP ".join(' ',@$nodes). " 2> /dev/null|") or die("Cannot open nmap pipe: $!");
    my $node;
    while (<FPING>) {
      if (/Host (.*) \(.*\) appears to be up/) {
          $node=$1;
          unless ($deadnodes{$node}) {
              foreach (keys %deadnodes) {
                  if ($node =~ /^$_\./) {
                      $node = $_;
                      last;
                  }
              }
          }
          delete $deadnodes{$node};
          print "$node: ping\n";
      }
    }
    foreach (sort keys %deadnodes) {
        print "$_: noping\n";
    }
}