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#!/usr/bin/perl -w
#
# try to connect to a particular
# port on a bunch of hosts. For use with "mon".
#
# Arguments are "[-p port] [-t timeout] [-r local-port] host [host...]"
#
# David Nolan, vitroth@cmu.edu
# based on tcp.monitor by Jim Trocki, trockij@transmeta.com
#
# $Id: udp.monitor,v 1.1 2005/02/19 17:43:21 vitroth Exp $
#
# Copyright (C) 1998, Jim Trocki
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
use Getopt::Std;
use Socket;
use Sys::Hostname;
my %opt;
getopts ("p:r:t:", \%opt);
my $PORT = $opt{"p"} || 23;
my $TIMEOUT = $opt{"t"} || 10;
my $RECVPORT = $opt{"r"};
my @failures = ();
my @detail = ();
my $ALARM = 0;
foreach my $host (@ARGV) {
my $pro = getprotobyname ('udp');
if (!defined $pro) {
die "could not getprotobyname\n";
}
if (!defined socket (S, PF_INET, SOCK_DGRAM, $pro)) {
die "could not create socket: $!\n";
}
my $a = inet_aton ($host);
if (!defined $a) {
push @failures, $host;
push @detail, "$host could not inet_aton";
close (S);
next;
}
my $sin = sockaddr_in ($PORT, $a);
if (!defined $sin) {
push @failures, $host;
push @detail, "$host could not sockaddr_in";
close (S);
next;
}
if (defined $RECVPORT) {
$iaddr = gethostbyname(hostname());
$paddr = sockaddr_in($RECVPORT, $iaddr);
$res = bind(S, $paddr);
if (!$res) {
push @failures, $host;
push @detail, "$host: Could not bind to local port $RECVPORT";
close (S);
next;
}
}
my ($r, $from);
eval {
local $SIG{"ALRM"} = sub { die "alarm\n" };
alarm $TIMEOUT;
send (S, "", 0, $sin);
$from = recv(S, $r, 1, 0);
alarm 0;
};
if ($@) {
push @failures, $host;
if ($@ eq "alarm\n") {
push @detail, "$host timeout";
} else {
push @detail, "$host interrupted syscall: $!";
}
close (S);
next;
}
if (!defined $r) {
push @failures, $host;
push @detail, "$host no udp response packet received: $!";
close (S);
next;
}
my ($fromport, $fromaddr) = sockaddr_in($from);
if ($fromport != $PORT || $fromaddr ne $a) {
push @failures, $host;
my $fromhost = gethostbyaddr($fromaddr, AF_INET);
push @detail, "response received from $fromhost:$fromport, instead of $host:$PORT";
next;
}
if (!defined close (S)) {
push @failures, $host;
push @detail, "$host could not close socket: $!";
next;
}
}
if (@failures == 0) {
exit 0;
}
print join (" ", sort @failures), "\n";
print "\n", join ("\n", @detail), "\n";
exit 1;
|
