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@@ -0,0 +1,179 @@
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+#!/usr/bin/perl -w
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+
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+# vnstat-metrics.cgi -- Prometheus compatible metrics endpoint output from vnStat data
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+# copyright (c) 2022 Teemu Toivola <tst at iki dot fi>
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+# released under the GNU General Public License
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+
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+use strict;
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+use JSON::PP;
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+use HTTP::Daemon;
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+use HTTP::Status;
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+
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+# location of vnstat binary
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+my $vnstat_cmd = '/usr/bin/vnstat';
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+
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+my @data_resolutions = ('fiveminute', 'hour', 'day', 'month', 'year');
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+
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+# Create an HTTP::Daemon instance listening on port 9955
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+my $d = HTTP::Daemon->new(
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+ LocalAddr => 'localhost',
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+ LocalPort => 9955,
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+) || die "Cannot create HTTP::Daemon instance: $!";
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+
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+print "HTTP server listening on ", $d->url, "\n";
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+
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+# Enter an event loop to handle incoming requests
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+while (my $c = $d->accept) {
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+ while (my $r = $c->get_request) {
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+ if ($r->method eq 'GET') {
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+ my $response_text = generate_response();
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+ $c->send_response(HTTP::Response->new(RC_OK, undef, undef, $response_text));
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+ } else {
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+ $c->send_error(RC_FORBIDDEN);
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+ }
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+ }
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+ $c->close;
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+ undef($c);
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+}
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+
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+sub generate_response {
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+ my $response = "Content-Type: text/plain\n\n";
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+
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+ my $json_data = `$vnstat_cmd --json s 1`;
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+
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+ my $data = "";
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+ eval { $data = decode_json($json_data) };
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+ if ($@) {
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+ $response .= "# Error: Invalid command output: $json_data\n";
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+ return $response;
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+ }
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+
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+ if (not defined $data->{'vnstatversion'}) {
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+ $response .= "# Error: Expected content from command output missing\n";
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+ return $response;
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+ }
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+
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+ if (not defined $data->{'interfaces'}[0]) {
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+ $response .= "# Error: No interfaces found in command output\n";
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+ return $response;
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+ }
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+
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+ if (not defined $data->{'interfaces'}[0]{'created'}{'timestamp'}) {
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+ $response .= "# Error: Incompatible vnStat version used\n";
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+ return $response;
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+ }
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+
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+ $response .= "# vnStat version: ".$data->{'vnstatversion'}."\n";
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+
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+ $response .= print_totals($data);
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+
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+ foreach my $data_resolution ( @data_resolutions ) {
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+ $response .= print_data_resolution($data_resolution, $data);
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+ }
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+
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+ return $response;
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+}
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+
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+################
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+
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+
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+sub get_interface_alias
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+{
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+ my ($interface) = @_;
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+ my $interface_alias = $interface->{'alias'};
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+ if (length($interface_alias) == 0) {
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+ $interface_alias = $interface->{'name'};
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+ }
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+ return $interface_alias;
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+}
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+
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+sub print_totals
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+{
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+ my ($data) = @_;
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+
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+ print "\n# HELP vnstat_interface_total_received_bytes All time total received (rx) bytes\n";
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+ print "# TYPE vnstat_interface_total_received_bytes counter\n";
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+
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+ foreach my $interface ( @{ $data->{'interfaces'} } ) {
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+ my $interface_alias = get_interface_alias($interface);
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+ print "vnstat_interface_total_received_bytes{interface=\"$interface->{'name'}\",alias=\"$interface_alias\"} $interface->{'traffic'}{'total'}{'rx'} $interface->{'updated'}{'timestamp'}000\n";
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+ }
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+
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+ print "\n# HELP vnstat_interface_total_transmitted_bytes All time total transmitted (tx) bytes\n";
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+ print "# TYPE vnstat_interface_total_transmitted_bytes counter\n";
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+
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+ foreach my $interface ( @{ $data->{'interfaces'} } ) {
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+ my $interface_alias = get_interface_alias($interface);
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+ print "vnstat_interface_total_transmitted_bytes{interface=\"$interface->{'name'}\",alias=\"$interface_alias\"} $interface->{'traffic'}{'total'}{'tx'} $interface->{'updated'}{'timestamp'}000\n";
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+ }
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+}
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+
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+sub print_data_resolution
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+{
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+ my ($resolution, $data) = @_;
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+ my $output_count = 0;
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+
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+ print "\n# HELP vnstat_interface_".$resolution."_received_bytes Received (rx) bytes for current $resolution\n";
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+ print "# TYPE vnstat_interface_".$resolution."_received_bytes gauge\n";
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+
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+ $output_count = 0;
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+ foreach my $interface ( @{ $data->{'interfaces'} } ) {
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+ my $interface_alias = get_interface_alias($interface);
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+ if (defined $interface->{'traffic'}{$resolution}) {
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+ print "vnstat_interface_".$resolution."_received_bytes{interface=\"$interface->{'name'}\",alias=\"$interface_alias\"} $interface->{'traffic'}{$resolution}[0]{'rx'} $interface->{'updated'}{'timestamp'}000\n";
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+ $output_count++;
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+ }
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+ }
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+ if ($output_count == 0) {
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+ print "# no data\n";
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+ }
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+
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+ print "\n# HELP vnstat_interface_".$resolution."_transmitted_bytes Transmitted (tx) bytes for current $resolution\n";
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+ print "# TYPE vnstat_interface_".$resolution."_transmitted_bytes gauge\n";
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+
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+ $output_count = 0;
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+ foreach my $interface ( @{ $data->{'interfaces'} } ) {
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+ my $interface_alias = get_interface_alias($interface);
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+ if (defined $interface->{'traffic'}{$resolution}) {
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+ print "vnstat_interface_".$resolution."_transmitted_bytes{interface=\"$interface->{'name'}\",alias=\"$interface_alias\"} $interface->{'traffic'}{$resolution}[0]{'tx'} $interface->{'updated'}{'timestamp'}000\n";
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+ $output_count++;
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+ }
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+ }
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+ if ($output_count == 0) {
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+ print "# no data\n";
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+ }
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+}
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+
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+print "Content-Type: text/plain\n\n";
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+
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+my $json_data = `$vnstat_cmd --json s 1`;
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+
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+my $data = "";
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+eval { $data = decode_json($json_data) };
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+if ($@) {
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+ print "# Error: Invalid command output: $json_data\n";
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+ exit 1;
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+}
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+
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+if (not defined $data->{'vnstatversion'}) {
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+ print "# Error: Expected content from command output missing\n";
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+ exit 1;
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+}
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+
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+if (not defined $data->{'interfaces'}[0]) {
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+ print "# Error: No interfaces found in command output\n";
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+ exit 1;
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+}
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+
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+if (not defined $data->{'interfaces'}[0]{'created'}{'timestamp'}) {
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+ print "# Error: Incompatible vnStat version used\n";
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+ exit 1;
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+}
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+
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+print "# vnStat version: ".$data->{'vnstatversion'}."\n";
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+
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+print_totals($data);
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+
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+foreach my $data_resolution ( @data_resolutions ) {
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+ print_data_resolution($data_resolution, $data);
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+}
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