/usr/lib/xymon/server/ext/tftp is in hobbit-plugins 20170219.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94  | #!/usr/bin/perl
#
# Xymon test to check tftp servwrs
#
# This server script is based on Roland Rosenfeld's conn6 test which
# itself is based on a shell script from the Debian hobbit-plugins
# package, but rewritten in Perl.
#
# Just add tftp to the services of a host and this script will try to
# download the file /pxelinux.0 via TFTP from the given host.
#
# Alternatively you can add colon separated a file or path which
# should be used to test the TFTP server.
#
# Currently only one file per server can be tested.
#
# Examples:
# 10.1.2.3 foo # ftp tftp
# 10.1.2.4 bar # smtp tftp:bootmgr.exe
# 10.1.2.5 baz # tftp:/sparc.img
#
# Copyright (c) 2011       Roland Rosenfeld <roland@spinnaker.de>
# Copyright (c) 2011-2012  Axel Beckert <abe@debian.org>
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    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.
#
#    You should have received a copy of the GNU General Public License along
#    with this program; if not, write to the Free Software Foundation, Inc.,
#    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
use strict;
use warnings;
#use Data::Dumper;
use Hobbit;
use Net::TFTP;
my $default_path = '/pxelinux.0';
my %remote_path = ();
open(HOSTGREP, '-|', "$ENV{XYMONHOME}/bin/xymongrep tftp tftp:\* dialup")
    || croak("cannot run $ENV{XYMONHOME}/bin/xymongrep");
while (<HOSTGREP>) {
   if (/^(\d+\.\d+\.\d+\.\d+)\s+(\S+)\s+#\s+(.*)$/) {
      my ($ipv4, $host, $services) = ($1, $2, $3);
      # parse services:
      my $dialup = 0;
      my @destinations;
      foreach my $service (split /\s+/, $services) {
	  if ($service eq 'dialup') {
	      $dialup = 1;
         } elsif ($service eq 'tftp') {
	     push @destinations, $host;
	     $remote_path{$host} = $default_path;
         } elsif ($service =~ /^tftp:(.*)$/) {
	     push @destinations, $host;
	     $remote_path{$host} = $1;
         }
      }
      next if $#destinations == -1; # no tftp found, only dialup
      my $output = '';
      my $color = 'green';
      foreach my $destination (@destinations) {
	 my $tftp = Net::TFTP->new($destination);
	 my $bb = new Hobbit({ test => 'tftp', hostname => $destination });
	 $tftp->get($remote_path{$destination});
	 my $error = $tftp->error;
         if ($error) {
	     if ($dialup == 1) {
		 $bb->add_color('clear');
		 $bb->print("&red Couldn't download $remote_path{$destination} from $destination via TFTP");
	     } else {
		 $bb->color_line('red', "Couldn't download $remote_path{$destination} from $destination via TFTP");
	     }
         } else {
	     $bb->color_line('green', "Successfully downloaded $remote_path{$destination} from $destination via TFTP");
	 }
	 $bb->send();
      }
   }
}
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