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#!/usr/bin/perl
#
# Use try to connect to a http server.
# For use with "mon".
#
# Arguments are "-p port host [host...]"
#
# Jon Meek
# American Cyanamid Company
# Princeton, NJ
#
# $Id: http.monitor,v 1.3 1998/01/18 17:41:08 trockij 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 English;
getopts ("p:t:");
$PORT = $opt_p || 80;
$TIMEOUT = $opt_t || 30;
@failures = ();
foreach $host (@ARGV) {
$OK = &httpGET($host, $PORT);
if (!defined (OK) || $OK == 0) {
push (@failures, $host);
}
}
if (@failures == 0) {
exit 0;
}
print "@failures\n";
exit 1;
sub httpGET {
use Socket;
use Sys::Hostname;
my($Server, $Port) = @_;
my($ServerOK, $TheContent);
$TheContent = '';
$Path = '/';
###############################################################
eval {
local $SIG{ALRM} = sub { die "Timeout Alarm" };
alarm $TIMEOUT;
$result = &OpenSocket($Server, $Port); # Open a connection to the server
if ($result == 0) { # Failure to open the socket
return '';
}
print S "GET $Path HTTP/1.0\r\n";
print S "User-Agent: mon.d/http.monitor\r\n\r\n";
while ($in = <S>) {
$TheContent .= $in; # Store data for later processing
}
# HTTP/1.1 200 OK
if ($TheContent =~ /^HTTP\/([\d\.]+)\s+200\b/) {
$ServerOK = 1;
} else {
$ServerOK = 0;
}
close(S);
alarm 0; # Cancel the alarm
};
if ($EVAL_ERROR and ($EVAL_ERROR eq 'Timeout Alarm')) {
print "**** Time Out\n";
return 0;
}
return $ServerOK;
}
sub OpenSocket {
#
# Make a Berkeley socket connection between this program and a TCP port
# on another (or this) host. Port can be a number or a named service
#
local($OtherHostname, $Port) = @_;
local($OurHostname, $sockaddr, $name, $aliases, $proto, $type, $len,
$ThisAddr, $this, $that);
$OurHostname = &hostname;
($name, $aliases, $proto) = getprotobyname('tcp');
($name, $aliases, $Port) = getservbyname($Port, 'tcp') unless $Port =~ /^\d+$/;
($name, $aliases, $type, $len, $ThisAddr) = gethostbyname($OurHostname);
($name, $aliases, $type, $len, $OtherHostAddr) = gethostbyname($OtherHostname);
$sockaddr = 'S n a4 x8'; # Format for packed network address
$this = pack($sockaddr, &AF_INET, 0, $ThisAddr);
$that = pack($sockaddr, &AF_INET, $Port, $OtherHostAddr);
$result = socket(S, &PF_INET, &SOCK_STREAM, $proto) || return undef;
$result = bind(S, $this) || return undef;
$result = connect(S, $that) || return undef;
select(S); $| = 1; select(STDOUT); # set S to be un-buffered
return 1; # success
}
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