From da72f062bbfdabaafece6c466df222a23e70b7c6 Mon Sep 17 00:00:00 2001
From: Niklas Yann Wettengel <niyawe@niyawe.de>
Date: Sun, 22 Jul 2018 13:14:46 +0200
Subject: updated influx-scripts

---
 .../templates/ffmyk-influx/dhcp.php.j2             | 70 ++++++++++++++++++----
 1 file changed, 60 insertions(+), 10 deletions(-)

(limited to 'roles/install_monitoring/templates/ffmyk-influx/dhcp.php.j2')

diff --git a/roles/install_monitoring/templates/ffmyk-influx/dhcp.php.j2 b/roles/install_monitoring/templates/ffmyk-influx/dhcp.php.j2
index 7b81328..4d3773b 100644
--- a/roles/install_monitoring/templates/ffmyk-influx/dhcp.php.j2
+++ b/roles/install_monitoring/templates/ffmyk-influx/dhcp.php.j2
@@ -1,23 +1,73 @@
 <?php
+date_default_timezone_set('UTC');
 
 require('func.php');
 
-        $data = shell_exec("grep -e 'lease [[:digit:]\.]\+ {' -e '\s\+ends' /var/lib/dhcp/dhcpd.leases");
+$dhcp_config = file_get_contents('/etc/dhcpd.conf');
 
-        preg_match_all('/lease ([\d\.]+) \{\n\s+ends \d+ (\d{4}\/\d{2}\/\d{2} \d+:\d{2}:\d{2});/s', $data, $match);
+$num_ranges = preg_match_all('/range[\s]+([\d]+\.[\d]+\.[\d]+\.[\d]+)[\s]+([\d]+\.[\d]+\.[\d]+\.[\d]+)/', $dhcp_config, $ranges);
 
-        unset($data, $match[0]);
+$lease_file_handle = fopen("/var/lib/dhcp/dhcpd.leases", "r");
 
-        $dend = time()-120;
+$activeleases = array();
 
-        $clients = 0;
+$lease = -1;
+$start = -1;
+$end = -1;
 
-        foreach($match[2] as $timeout) {
-                $end = strtotime($timeout.' UTC');
-                if($end > $dend) $clients++;
+while(($line = fgets($lease_file_handle)) !== false)
+{
+    if(preg_match('/lease ([\d]+\.[\d]+\.[\d]+\.[\d]+)/', $line, $match))
+    {
+        $lease = ip2long($match[1]);
+        continue;
+    }
+    elseif(preg_match('/starts \d ([\d]{4})\/([\d]{2})\/([\d]{2}) ([\d]{2}):([\d]{2}):([\d]{2})/', $line, $match))
+    {
+        $start = mktime($match[4], $match[5], $match[6], $match[2], $match[3], $match[1]);
+        continue;
+    }
+    elseif(preg_match('/ends \d ([\d]{4})\/([\d]{2})\/([\d]{2}) ([\d]{2}):([\d]{2}):([\d]{2})/', $line, $match))
+    {
+        $end = mktime($match[4], $match[5], $match[6], $match[2], $match[3], $match[1]);
+        if($lease > 0 && $start > 0 && $end > 0)
+        {
+            if( $start < time() && $end > time() )
+            {
+                $activeleases[$lease] = $lease;
+                $lease = -1;
+                $start = -1;
+                $end = -1;
+            }
         }
+    }
+}
 
-        $data = 'clients,host={{ ansible_hostname }},type=backend value='.$clients;
-        sendflux($data);
+$pools = array();
 
+for($range = 0; $range < $num_ranges; $range++)
+{
+    $clients = 0;
+
+    $range_start = ip2long($ranges[1][$range]);
+    $range_end = ip2long($ranges[2][$range]);
+    foreach($activeleases as $lease)
+    {
+        if( $lease > $range_start && $lease < $range_end )
+        {
+            $clients++;
+        }
+    }
+
+    $pools[$range_start] = $clients;
+}
+
+$data = "";
+
+foreach($pools as $range => $clients)
+{
+    $data .= 'clients,host={{ ansible_hostname }},pool='.long2ip($range).',type=backend value='.$clients."\n";
+}
+
+sendflux($data);
 ?>
-- 
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