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|
#!/usr/local/bin/perl -w
# -*- perl -*-
# Cricket: a configuration, polling and data display wrapper for RRD files
#
# Copyright (C) 1998 Jeff R. Allen and WebTV Networks, Inc.
#
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
BEGIN {
# This magic attempts to guess the install directory based
# on how the script was called. If it fails for you, just
# hardcode it.
require '/etc/cricket/cricket-conf.pl';
# Necessary for set[ug]id operation
$ENV{PATH} = '/bin:/usr/bin';
}
use lib "$Common::global::gInstallRoot/lib";
use CGI qw(fatalsToBrowser);
use Digest::MD5;
use Common::global;
use Common::Log;
use Common::Util;
Common::Log::setLevel('warn');
# Set a safe path. Necessary for set[ug]id operation.
$ENV{PATH} = "/bin:/usr/bin";
# cache cleaning params
#
$gPollingInterval = 5 * 60; # defaults to 5 minutes
$Common::global::gUrlStyle ||= "classic";
my $gUsePathInfo = 0;
if ($Common::global::gUrlStyle eq "pathinfo") {
$gUsePathInfo = 1;
}
$main::gQ = new CGI;
doGraph();
sub doGraph {
my($imageName) = generateImageName($main::gQ);
# check the image's existance (i.e. no error from stat()) and age
my($mtime);
if (defined($imageName)) {
$mtime = (stat($imageName))[9];
}
if (!defined($mtime) || ((time() - $mtime) > $main::gPollingInterval)) {
# this request is actually going to need work... pass it on
if (Common::Util::isWin32()) {
exec("perl $Common::global::gInstallRoot/grapher.cgi");
} else {
exec("$Common::global::gInstallRoot/grapher.cgi");
}
} else {
Debug("Cached image exists: $imageName. Using that.");
sprayPng($imageName);
}
}
sub tryPng {
my($png) = @_;
# we need to make certain there are no buffering problems here.
local($|) = 1;
if (! open(PNG, "<$png")) {
return;
} else {
my($stuff, $len);
binmode(PNG);
while ($len = read(PNG, $stuff, 8192)) {
print $stuff;
}
close(PNG);
}
return 1;
}
sub sprayPng {
my($png) = @_;
print $main::gQ->header('image/png');
if (! tryPng($png)) {
Warn("Could not open $png: $!");
if (! tryPng("/usr/share/cricket/images/failed.png")) {
Warn("Could not send failure png: $!");
return;
}
}
return 1;
}
sub generateImageName {
my($q) = @_;
my($param, $md5);
$md5 = new Digest::MD5;
# make sure to munge $target correctly if $gUrlStyle = pathinfo
$md5->add(urlTarget($q));
foreach $param ($q->param()) {
next if ($param eq 'rand');
next if ($param eq 'target');
if ($param eq 'cache') {
if (lc($q->param($param)) eq 'no') {
return;
}
}
$md5->add($param, $q->param($param));
}
my($hash) = unpack("H8", $md5->digest());
return "$Common::global::gCacheDir/cricket-$hash.png";
}
# Get or set the target from the $cgi object.
sub urlTarget {
my $cgi = shift;
my $target = shift;
return $cgi->param('target', $target) if !$gUsePathInfo;
if (!defined($target)) {
$target = $cgi->path_info();
$target =~ s/\/+$//; # Zonk any trailing slashes
$target ||= "/"; # but we name the root explicitly
return $target;
}
$cgi->path_info($target);
}
# Local Variables:
# mode: perl
# indent-tabs-mode: nil
# tab-width: 4
# perl-indent-level: 4
# End:
|
