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#!/usr/bin/perl
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#
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# Generate a machine readable index from mrtg.cfg inputs
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#
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our $VERSION=0.6;
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use strict;
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use warnings;
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use FileHandle;
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use JSON;
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use Data::Dumper;
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$Data::Dumper::Indent = 1;
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$Data::Dumper::Sortkeys = 1;
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use CGI ':all';
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use CGI::Carp qw(fatalsToBrowser);
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use Sys::Hostname;
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use HTML::Entities();
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# List of config files to search for
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my @config_files = (
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'/etc/mrtg.cfg',
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'/usr/share/WWW/mrtg/mrtg.cfg',
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);
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# FIXME - globals
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my $warnings;
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my $db = {}; # storage for all tests found
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$db->{global}{graph}{mtime} = 0; # Scan for newest graph and save info for later
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$db->{hide}{mrtg}{global}{postfix}{xsize} = 500;
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$db->{hide}{mrtg}{global}{postfix}{ysize} = 135;
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sub config_save_val($$$$) {
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my ($filename,$name,$var,$val) = @_;
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my $this_ysize;
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my $this_xsize;
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my $this_title;
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# HACK!
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if ( $var eq 'ysize' ) {
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$val += 35;
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} elsif ( $var eq 'xsize' ) {
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$val += 100;
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}
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# Save any default initializers
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if ($name eq '_') {
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$db->{hide}{mrtg}{global}{postfix}{$var} = $val;
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return;
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}
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if ($name eq '^') {
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$db->{hide}{mrtg}{global}{prefix}{$var} = $val;
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return;
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}
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# Check for name name collision, and uniqueify
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my $unique_name = $name;
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my $unique_id = 1;
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while (defined $db->{graph}->{$unique_name}
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&& $db->{graph}->{$unique_name}->{definedby} ne $filename) {
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$unique_name = $name . '_' . $unique_id;
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$unique_id++;
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}
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if (!defined $db->{graph}->{$unique_name}) {
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# initialize a new name
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#TODO - instantiate new tests from all of the "_"/"^" defaults
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push @{$db->{hide}{sequence}}, $unique_name;
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$db->{graph}->{$unique_name}->{name} = $name;
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$db->{graph}->{$unique_name}->{definedby} = $filename;
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$db->{graph}->{$unique_name}->{sequence} = @{$db->{hide}{sequence}};
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$db->{graph}{$unique_name}{img}{xsize} = $db->{hide}{mrtg}{global}{postfix}{xsize};
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$db->{graph}{$unique_name}{img}{ysize} = $db->{hide}{mrtg}{global}{postfix}{ysize};
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}
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$db->{hide}{mrtg}{target}{$unique_name}{$var} = $val;
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}
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# Load one or more files
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#
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sub config_load_file(@) {
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while (@_) {
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my $filename = shift;
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my $fh = new FileHandle $filename,"r";
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if (!defined $fh) {
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# FIXME globals
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$warnings .= "Warning: Could not open $filename $!\n";
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return;
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}
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#TODO - multi-line values
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#TODO - reset the {hide}{mrtg}{global} vars
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while(<$fh>){
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# Is this a standard MRTG setting?
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if ( $_ =~ /^([^#[][^[]+)\[(.*)\]:\s*(.+)$/ ) {
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my $var=lc $1;
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my $name=lc $2;
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my $val=$3;
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config_save_val($filename,$name,$var,$val);
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} elsif ( $_ =~ /^([^#[][^[]+):\s*(.+)$/ ) {
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# its a global statement
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my $var=lc $1;
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my $val=$2;
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$db->{hide}{mrtg}{global}{$var}=$val;
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}
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# TODO - Handle extra statements:
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# Include
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# WorkDir - see config_read_filesystem
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# LogDir
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# ##HC Magic for baseurl
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}
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}
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}
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# Itterate through the loaded name and read their mtime and
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# any other filesystem details for them.
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#
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sub config_read_filesystem() {
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# TODO - also check the other directory statements
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if ($db->{hide}{mrtg}{global}{workdir}) {
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chdir $db->{hide}{mrtg}{global}{workdir};
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}
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# check and update details for all known tests;
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for my $i (keys %{$db->{graph}}) {
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my $graph = $db->{graph}->{$i};
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my $graphname = $graph->{name};
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my $mrtg = $db->{hide}{mrtg}{target}{$i};
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# Default is GIF, unless a PNG file exists
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$mrtg->{_imagetype} = 'gif';
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if ( -e "$graphname-day.png" ) {
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$mrtg->{_imagetype} = "png";
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}
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# TODO - determine correct URL prefix
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# TODO - change the filename based on the displayed period
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my $filename = $graphname . "-day." . $mrtg->{_imagetype};
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$graph->{img}{URL}{day} = $filename;
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$graph->{img}{URL}{week} = $graphname."-week.".$mrtg->{_imagetype};
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$graph->{img}{URL}{month} = $graphname."-month.".$mrtg->{_imagetype};
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$graph->{img}{URL}{year} = $graphname."-year.".$mrtg->{_imagetype};
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my ($dev, $ino, $mode, $nlink, $uid, $gid, $rdev, $size,
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$atime,$mtime,$ctime,$blksize,$blocks)
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= stat($filename);
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if (!defined $mtime) {
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# if we cannot stat the file, skip it
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next;
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}
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# TODO - move these to a better function
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$graph->{URL} = $graphname . '.html';
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$graph->{title} = $mrtg->{title};
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$graph->{img}{mtime} = $mtime;
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# find the newest file
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if ($mtime > $db->{global}{graph}{mtime}) {
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$db->{global}{graph}{mtime} = $mtime;
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}
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}
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}
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sub extract_grouphosttest($) {
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my ($name) = @_;
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# Do not classify a test with no separators in it
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if ($name !~ /,/) {
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return undef;
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}
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my ($group,$host,$test) = split ',', $name;
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# TODO cope with missing group/host/test parts.
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if (!defined $group || !defined $host || !defined $test) {
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return undef;
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}
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return ($group,$host,$test);
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}
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# Read through the list of name and find common hostname prefixes,
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# so that we can group these hosts together
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# (a hosttype entry)
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#
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sub maketree_find_hosttypes() {
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for my $name (keys %{$db->{graph}}) {
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my ($group,$host,$test) = extract_grouphosttest($name);
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if (!defined($group)) {
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next;
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}
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my $hosttype;
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# TODO - this needs to have a better way...
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# hosttype is the non digit hostname prefix - thus
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# "proxy-1" and "proxy-2" would both end up in the
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# "proxy-" hosttype
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if ($host =~ m/^(.*[^0-9])(\d+)$/) {
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$hosttype = $1.'*';
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} else {
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next;
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}
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$db->{graph}{$name}{tag}{hosttype} = $hosttype;
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$db->{hide}{hosttype}->{$hosttype}->{$host}++;
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}
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for my $hosttype (keys %{$db->{hide}{hosttype}}) {
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if ((keys %{$db->{hide}{hosttype}->{$hosttype}})<2) {
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delete $db->{hide}{hosttype}->{$hosttype};
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}
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}
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}
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sub maketags() {
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maketree_find_hosttypes();
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for my $name (keys %{$db->{graph}}) {
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my $graph = $db->{graph}->{$name};
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my ($group,$host,$test) = extract_grouphosttest($name);
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$graph->{tag}{group}=$group if $group;
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$graph->{tag}{host}=$host if $host;
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$graph->{tag}{test}=$test if $test;
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}
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}
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my $this_host = hostname;
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print "Content-Type: text/json; charset=ISO-8859-1\n";
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config_load_file(@config_files);
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config_read_filesystem();
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maketags();
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# Time the next update to occur a little while after the next interval completes
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my $interval = 300; # 5 min update interval
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my $guardband = 15; # updates occur this many seconds after predicted gif completion
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my $refresh = $interval + $guardband + $db->{global}{graph}{mtime} - time; # predict how long until next update
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$refresh = $interval if $refresh <= $guardband;
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my $expires = gmtime (time + $interval * 2 + $guardband);
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$db->{global}{creator}{name} = "indexmrtg";
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$db->{global}{creator}{version} = "$VERSION";
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$db->{global}{graph}{expires} = "$expires GMT";
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$db->{global}{graph}{refresh} = $refresh;
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$db->{global}{sequence} = @{$db->{hide}{sequence}};
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if (param('debug')) {
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print "\n",Dumper(\$db),"\n";
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}
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# Remove objects that are not intended to be public
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delete $db->{hide};
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print "\n",JSON->new->utf8(1)->pretty(1)->canonical(1)->encode($db),"\n";
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