add dhcp-stats tests and update for v3 of the extend (#15378)

* update dhcp polling for version 3 of the extend

* add initial lease display for dhcp

* note where I copied it from

* document the new ISC DHCP stuff

* add in displaying pool and subnet info

* finalize the docs the new dhcpd stuff

* rework the dhcp page to display more information in a cleaner manner

* now display port and device info if known for a lease

* minor comment cleanup for the dhcp page

* add tests

* do not display the optionbar if the extend is not 3+

* update dhcp-stats doc for -w

* poke includes/html/functions.inc.php with php-cs-fixer

* poke includes/html/pages/device/apps/dhcp-stats.inc.php with php-cs-fixer

* derp... add the tests and not the snmprec twice

* strftime -> date

* fix naming of the linux dhcp-stats test data files

* minor tweaks to the rest results

* test fix

* more test cleanup

* minor test fix

* set the data value for v3

* minor test tweak

* add sortable_table blade template

* no longer need render_table

* formatting fix

* add regexp to make sure the mac is sane

* style fix

* formatting cleanup

* some more formatting fixes

doc/Extensions/Applications.md

@@ -1074,33 +1074,46 @@ extend icecast /etc/snmp/icecast-stats.sh
 
 A small python3 script that reports current DHCP leases stats and pool usage of ISC DHCP Server.
 
-Also you have to install the dhcpd-pools Package.
-Under Ubuntu/Debian just run `apt install dhcpd-pools` or under
-FreeBSD `pkg install dhcpd-pools`.
+Also you have to install the dhcpd-pools and the required Perl
+modules. Under Ubuntu/Debian just run `apt install
+cpanminus ; cpanm Net::ISC::DHCPd::Leases Mime::Base64 File::Slurp` or under FreeBSD
+`pkg install p5-JSON p5-MIME-Base64 p5-App-cpanminus p5-File-Slurp ; cpanm Net::ISC::DHCPd::Leases`.
 
 ### SNMP Extend
 
 1. Copy the shell script to the desired host.
 ```
-wget https://github.com/librenms/librenms-agent/raw/master/snmp/dhcp.py -O /etc/snmp/dhcp.py
+wget https://github.com/librenms/librenms-agent/raw/master/snmp/dhcp -O /etc/snmp/dhcp
 ```
 
 2. Make the script executable
 ```
-chmod +x /etc/snmp/dhcp.py
+chmod +x /etc/snmp/dhcp
 ```
 
-3. Edit your config file, Content of an example /etc/snmp/dhcp.json
+3. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
 ```
-{"leasefile": "/var/lib/dhcp/dhcpd.leases" }
+# without using cron
+extend dhcpstats /etc/snmp/dhcp -Z
+# using cron
+extend dhcpstats /bin/cat /var/cache/dhcp_extend
 ```
-Key 'leasefile' specifies the path to your lease file.
 
-4. Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
+4. If on a slow system running it via cron may be needed.
 ```
-extend dhcpstats /etc/snmp/dhcp.py
+*/5 * * * * /etc/snmp/dhcp -Z -w /var/cache/dhcp_extend
 ```
 
+The following options are also supported.
+
+| Option     | Description                     |
+|------------|---------------------------------|
+| `-c $file` | Path to dhcpd.conf.             |
+| `-l $file` | Path to lease file.             |
+| `-Z`       | Enable GZip+Base64 compression. |
+| `-d`       | Do not de-dup.                  |
+| `-w $file` | File to write it out to.        |
+
 5. Restart snmpd on your host
 
 The application should be auto-discovered as described at the top of

includes/html/pages/device/apps/dhcp-stats.inc.php

@@ -1,15 +1,172 @@
 <?php
 
-$graphs = [
-    'dhcp-stats_stats' => 'Stats',
-    'dhcp-stats_pools_percent' => 'Pools Percent',
-    'dhcp-stats_pools_current' => 'Pools Current',
-    'dhcp-stats_pools_max' => 'Pools Max',
-    'dhcp-stats_networks_percent' => 'Networks Percent',
-    'dhcp-stats_networks_current' => 'Networks Current',
-    'dhcp-stats_networks_max' => 'Networks Max',
+use App\Models\Port;
+
+$link_array = [
+    'page' => 'device',
+    'device' => $device['device_id'],
+    'tab' => 'apps',
+    'app' => 'dhcp-stats',
 ];
 
+// app data is only going to exist for this for extend 3+, so don't both displaying it otherwise
+if (isset($app->data['pools'])) {
+    print_optionbar_start();
+    echo generate_link('General', $link_array);
+    echo ' | ' . generate_link('Pools', $link_array, ['app_page' => 'pools']);
+    echo ' | ' . generate_link('Leases', $link_array, ['app_page' => 'leases']);
+    print_optionbar_end();
+}
+
+if (! isset($vars['app_page']) || ! isset($app->data['pools'])) {
+    $graphs = [
+        'dhcp-stats_stats' => 'Stats',
+        'dhcp-stats_pools_percent' => 'Pools Percent',
+        'dhcp-stats_pools_current' => 'Pools Current',
+        'dhcp-stats_pools_max' => 'Pools Max',
+        'dhcp-stats_networks_percent' => 'Networks Percent',
+        'dhcp-stats_networks_current' => 'Networks Current',
+        'dhcp-stats_networks_max' => 'Networks Max',
+    ];
+} elseif (isset($vars['app_page']) && $vars['app_page'] == 'pools') {
+    $pools = $app->data['pools'] ?? [];
+    print_optionbar_start();
+    echo '<center><b>Pools</b></center>';
+    $pool_table = [
+        'headers' => [
+            'CIDR',
+            'First IP',
+            'Last IP',
+            'Max',
+            'In Use',
+            'Use%',
+        ],
+        'rows' => [],
+    ];
+    foreach ($pools as $key => $pool) {
+        $pool_table['rows'][$key] = [
+            ['data' => $pool['cidr']],
+            ['data' => $pool['first_ip']],
+            ['data' => $pool['last_ip']],
+            ['data' => $pool['max']],
+            ['data' => $pool['cur']],
+            ['data' => $pool['percent']],
+        ];
+    }
+    echo view('widgets/sortable_table', $pool_table);
+    print_optionbar_end();
+
+    print_optionbar_start();
+    echo '<center><b>Subnets Details</b></center>';
+    print_optionbar_start();
+    $pool_detail_table = [
+        'headers' => [
+            'Key',
+            'Value',
+        ],
+    ];
+    foreach ($pools as $pool_key => $pool) {
+        // re-init the rows the pools detail table
+        unset($pool_detail_table['rows']);
+        $pool_detail_table['rows'] = [];
+        // display it this way as a CIDR may have more than one pool defined for it
+        // especially true if both IPv4 and IPv6 are in use
+        echo '<center><b>' . $pool['cidr'] . ', ' . $pool['first_ip'] . '-' . $pool['last_ip'] . '</b></center>';
+        $option_row_int = 0;
+        // remove these as they are stats and no options related info for the subnet
+        unset($pool['cur']);
+        unset($pool['max']);
+        unset($pool['percent']);
+        foreach ($pool as $pool_option => $option_value) {
+            $pool_detail_table['rows'][$option_row_int] = [
+                ['data' => $pool_option],
+                ['data' => $option_value],
+            ];
+            $option_row_int++;
+        }
+        echo view('widgets/sortable_table', $pool_detail_table);
+    }
+    print_optionbar_end();
+    print_optionbar_end();
+
+    $subnets = $app->data['networks'] ?? [];
+    print_optionbar_start();
+    echo '<center><b>Networks</b></center>';
+    $subnets_table = [
+        'headers' => [
+            'Name',
+            'Max',
+            'In Use',
+            'Use%',
+            'Pools',
+        ],
+        'rows' => [],
+    ];
+    foreach ($subnets as $key => $subnet) {
+        $subnets_table['rows'][$key] = [
+            ['data' => $subnet['network']],
+            ['data' => $subnet['max']],
+            ['data' => $subnet['cur']],
+            ['data' => $subnet['percent']],
+            ['data' => json_encode($subnet['pools'])],
+        ];
+    }
+    echo view('widgets/sortable_table', $subnets_table);
+    print_optionbar_end();
+} elseif (isset($vars['app_page']) && $vars['app_page'] == 'leases') {
+    $leases = $app->data['found_leases'] ?? [];
+    $table_info = [
+        'headers' => [
+            'IP',
+            'State',
+            'HW Address',
+            'Starts',
+            'Ends',
+            'Client Hostname',
+            'Vendor',
+        ],
+        'rows' => [],
+    ];
+    foreach ($leases as $key => $lease) {
+        // look and see if we know what that mac belongs to and if so create a link for the device and port
+        $mac = $lease['hw_address'];
+        $mac_raw = false;
+        if (preg_match('/^[A-Ea-e0-9][A-Ea-e0-9]:[A-Ea-e0-9][A-Ea-e0-9]:[A-Ea-e0-9][A-Ea-e0-9]:[A-Ea-e0-9][A-Ea-e0-9]:[A-Ea-e0-9][A-Ea-e0-9]:[A-Ea-e0-9][A-Ea-e0-9]$/', $mac)) {
+            $port = Port::with('device')->firstWhere(['ifPhysAddress' => str_replace(':', '', $mac)]);
+        }
+        if (isset($port)) {
+            // safe to set given we know we got a valid MAC if a $port is set
+            $mac_raw = true;
+            $mac = $mac . ' (' .
+                generate_device_link(['device_id' => $port->device_id]) . ', ' .
+                generate_port_link([
+                    'label' => $port->label,
+                    'port_id' => $port->port_id,
+                    'ifName' => $port->ifName,
+                    'device_id' => $port->device_id,
+                ]) . ')';
+        }
+
+        if ($lease['client_hostname'] != '') {
+            $lease['client_hostname'] = base64_decode($lease['client_hostname']);
+        }
+        if ($lease['vendor_class_identifier'] != '') {
+            $lease['vendor_class_identifier'] = base64_decode($lease['vendor_class_identifier']);
+        }
+        $table_info['rows'][$key] = [
+            ['data' => $lease['ip']],
+            ['data' => $lease['state']],
+            ['data' => $mac, 'raw' => $mac_raw],
+            //  display the time as UTC as that keeps things most simple
+            ['data' => date('Y-m-d\TH:i:s\Z', $lease['starts'])],
+            ['data' => date('Y-m-d\TH:i:s\Z', $lease['ends'])],
+            ['data' => $lease['client_hostname']],
+            ['data' => $lease['vendor_class_identifier']],
+        ];
+    }
+    echo view('widgets/sortable_table', $table_info);
+}
+
 foreach ($graphs as $key => $text) {
     $graph_type = $key;
     $graph_array['height'] = '100';

includes/polling/applications/dhcp-stats.inc.php

@@ -28,7 +28,7 @@ $version = intval($version);
 
 if ($version == 1) {
     $output = 'LEGACY';
-} elseif ($version == 2) {
+} elseif ($version >= 2) {
     $output = 'OK';
 } else {
     $output = 'UNSUPPORTED';
@@ -38,7 +38,7 @@ $metrics = [];
 $category = 'stats';
 if (intval($version) == 1) {
     [$dhcp_total, $dhcp_active, $dhcp_expired, $dhcp_released, $dhcp_abandoned, $dhcp_reset, $dhcp_bootp, $dhcp_backup, $dhcp_free] = explode("\n", $dhcpstats);
-} elseif ($version == 2) {
+} elseif ($version >= 2) {
     $lease_data = $dhcpstats['leases'];
 
     $dhcp_total = $lease_data['total'];
@@ -80,7 +80,7 @@ $metrics[$name . '_' . $category] = $fields;
 $tags = ['name' => $name, 'app_id' => $app->app_id, 'rrd_def' => $rrd_def, 'rrd_name' => $rrd_name];
 data_update($device, 'app', $tags, $fields);
 
-if ($version == 2) {
+if ($version >= 2) {
     $category = 'pools';
     $pool_data = $dhcpstats['pools'];
 
@@ -142,4 +142,8 @@ if ($version == 1) {
     $app_state = $dhcpstats['all_networks']['cur'] . '/' . $dhcpstats['all_networks']['max'];
 }
 
+if ($version >= 3) {
+    $app->data = $dhcpstats;
+}
+
 update_application($app, $output, $metrics, $app_state);

resources/views/widgets/sortable_table.blade.php

@@ -0,0 +1,79 @@
+<?php
+$table_id = 'renderTable' . random_int(1, 100000000);
+$function_id='sortTable'.$table_id;
+?>
+<table class="table" id="{{ $table_id }}">
+    <tr>
+        @foreach ($headers as $key => $header)
+            <th onclick="{{ $function_id }}({{ $key }})">{{ $header }}</th>
+        @endforeach
+    </tr>
+    @foreach ($rows as $row)
+        <tr>
+            @foreach ($row as $column)
+                @if (isset($column['raw']) && $column['raw'])
+                    <td>{!! $column['data'] !!}</td>
+                @else
+                    <td>{{ $column['data'] }}</td>
+                @endif
+            @endforeach
+        </tr>
+     @endforeach
+</table>
+
+<script>
+function {{ $function_id }}(n) {
+  var table, rows, switching, i, x, y, shouldSwitch, dir, switchcount = 0;
+  table = document.getElementById("{{ $table_id }}");
+  switching = true;
+  // Set the sorting direction to ascending:
+  dir = "asc";
+  /* Make a loop that will continue until
+  no switching has been done: */
+  while (switching) {
+    // Start by saying: no switching is done:
+    switching = false;
+    rows = table.rows;
+    /* Loop through all table rows (except the
+    first, which contains table headers): */
+    for (i = 1; i < (rows.length - 1); i++) {
+      // Start by saying there should be no switching:
+      shouldSwitch = false;
+      /* Get the two elements you want to compare,
+      one from current row and one from the next: */
+      x = rows[i].getElementsByTagName("TD")[n];
+      y = rows[i + 1].getElementsByTagName("TD")[n];
+      /* Check if the two rows should switch place,
+      based on the direction, asc or desc: */
+      if (dir == "asc") {
+        if (x.innerHTML.toLowerCase() > y.innerHTML.toLowerCase()) {
+          // If so, mark as a switch and break the loop:
+          shouldSwitch = true;
+          break;
+        }
+      } else if (dir == "desc") {
+        if (x.innerHTML.toLowerCase() < y.innerHTML.toLowerCase()) {
+          // If so, mark as a switch and break the loop:
+          shouldSwitch = true;
+          break;
+        }
+      }
+    }
+    if (shouldSwitch) {
+      /* If a switch has been marked, make the switch
+      and mark that a switch has been done: */
+      rows[i].parentNode.insertBefore(rows[i + 1], rows[i]);
+      switching = true;
+      // Each time a switch is done, increase this count by 1:
+      switchcount ++;
+    } else {
+      /* If no switching has been done AND the direction is "asc",
+      set the direction to "desc" and run the while loop again. */
+      if (switchcount == 0 && dir == "asc") {
+        dir = "desc";
+        switching = true;
+      }
+    }
+  }
+}
+</script>

tests/data/linux_dhcp-stats-v2.json

@@ -0,0 +1,124 @@
+{
+    "applications": {
+        "discovery": {
+            "applications": [
+                {
+                    "app_type": "dhcp-stats",
+                    "app_state": "UNKNOWN",
+                    "discovered": 1,
+                    "app_state_prev": null,
+                    "app_status": "",
+                    "app_instance": "",
+                    "data": null,
+                    "deleted_at": null
+                }
+            ]
+        },
+        "poller": {
+            "applications": [
+                {
+                    "app_type": "dhcp-stats",
+                    "app_state": "OK",
+                    "discovered": 1,
+                    "app_state_prev": "UNKNOWN",
+                    "app_status": "1/65",
+                    "app_instance": "",
+                    "data": null,
+                    "deleted_at": null
+                }
+            ],
+            "application_metrics": [
+                {
+                    "metric": "192.168.14.0_23_networks_current",
+                    "value": 1,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "192.168.14.0_23_networks_max",
+                    "value": 65,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "192.168.14.0_23_networks_percent",
+                    "value": 1.538,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "192.168.15.128_-_192.168.15.192_pools_current",
+                    "value": 1,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "192.168.15.128_-_192.168.15.192_pools_max",
+                    "value": 65,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "192.168.15.128_-_192.168.15.192_pools_percent",
+                    "value": 1.538,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_abandoned",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_active",
+                    "value": 3,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_backup",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_bootp",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_expired",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_free",
+                    "value": 52,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_released",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_reset",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_total",
+                    "value": 52,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                }
+            ]
+        }
+    }
+}

tests/data/linux_dhcp-stats-v3.json

@@ -0,0 +1,124 @@
+{
+    "applications": {
+        "discovery": {
+            "applications": [
+                {
+                    "app_type": "dhcp-stats",
+                    "app_state": "UNKNOWN",
+                    "discovered": 1,
+                    "app_state_prev": null,
+                    "app_status": "",
+                    "app_instance": "",
+                    "data": null,
+                    "deleted_at": null
+                }
+            ]
+        },
+        "poller": {
+            "applications": [
+                {
+                    "app_type": "dhcp-stats",
+                    "app_state": "OK",
+                    "discovered": 1,
+                    "app_state_prev": "UNKNOWN",
+                    "app_status": "1/65",
+                    "app_instance": "",
+                    "data": "{\"all_networks\":{\"cur\":\"1\",\"max\":\"65\",\"percent\":\"1.538\"},\"leases\":{\"abandoned\":0,\"active\":3,\"backup\":0,\"bootp\":0,\"expired\":0,\"free\":52,\"released\":0,\"reset\":0,\"total\":52},\"networks\":[{\"cur\":\"1\",\"max\":\"65\",\"network\":\"192.168.14.0\\\/23\",\"percent\":\"1.538\"}],\"pools\":[{\"cur\":\"1\",\"first_ip\":\"192.168.15.128\",\"last_ip\":\"192.168.15.192\",\"max\":\"65\",\"percent\":\"1.538\"}]}",
+                    "deleted_at": null
+                }
+            ],
+            "application_metrics": [
+                {
+                    "metric": "192.168.14.0_23_networks_current",
+                    "value": 1,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "192.168.14.0_23_networks_max",
+                    "value": 65,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "192.168.14.0_23_networks_percent",
+                    "value": 1.538,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "192.168.15.128_-_192.168.15.192_pools_current",
+                    "value": 1,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "192.168.15.128_-_192.168.15.192_pools_max",
+                    "value": 65,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "192.168.15.128_-_192.168.15.192_pools_percent",
+                    "value": 1.538,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_abandoned",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_active",
+                    "value": 3,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_backup",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_bootp",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_expired",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_free",
+                    "value": 52,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_released",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_reset",
+                    "value": 0,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                },
+                {
+                    "metric": "dhcp-stats_stats_dhcp_total",
+                    "value": 52,
+                    "value_prev": null,
+                    "app_type": "dhcp-stats"
+                }
+            ]
+        }
+    }
+}

tests/snmpsim/linux_dhcp-stats-v2.snmprec

@@ -0,0 +1,10 @@
+1.3.6.1.2.1.1.1.0|4|Linux server 3.10.0-693.5.2.el7.x86_64 #1 SMP Fri Oct 20 20:32:50 UTC 2017 x86_64
+1.3.6.1.2.1.1.2.0|6|1.3.6.1.4.1.8072.3.2.10
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