librenms-librenms/includes/discovery/ipv4-addresses.inc.php

<?php
  
  echo("IP Addresses : ");

  $oids = shell_exec($config['snmpwalk'] . " -m IP-MIB -".$device['snmpver']." -Osq -c ".$device['community']." ".$device['hostname'].":".$device['port']." ipAdEntIfIndex");
  $oids = trim($oids);
  $oids = str_replace("ipAdEntIfIndex.", "", $oids);
  foreach(explode("\n", $oids) as $data) {
    $data = trim($data);
    list($oid,$ifIndex) = explode(" ", $data);
    $mask = shell_exec($config['snmpget']." -m IP-MIB -O qv -".$device['snmpver']." -c ".$device['community']." ".$device['hostname'].":".$device['port']." ipAdEntNetMask.$oid");
    $mask = trim($mask);
    $network = trim(shell_exec ($config['ipcalc'] . " $oid/$mask | grep Network | cut -d\" \" -f 4"));
    list($net,$cidr) = explode("/", $network);
    $cidr = trim($cidr);
    if($mask == "255.255.255.255") { $cidr = "32"; $network = "$oid/$cidr"; }
    if (mysql_result(mysql_query("SELECT count(*) FROM `ports` WHERE device_id = '".$device['device_id']."' AND `ifIndex` = '$ifIndex'"), 0) != '0' && $oid != "0.0.0.0") {
      $i_query = "SELECT interface_id FROM `ports` WHERE device_id = '".$device['device_id']."' AND `ifIndex` = '$ifIndex'";
      $interface_id = mysql_result(mysql_query($i_query), 0);
      if (mysql_result(mysql_query("SELECT COUNT(*) FROM `ipv4_networks` WHERE `ipv4_network` = '$network'"), 0) < '1') {
        mysql_query("INSERT INTO `ipv4_networks` (`ipv4_network`) VALUES ('$network')");
        #echo("Create Subnet $network\n");
        echo("S");
      }
      $ipv4_network_id = @mysql_result(mysql_query("SELECT `ipv4_network_id` from `ipv4_networks` WHERE `ipv4_network` = '$network'"), 0);

      if (mysql_result(mysql_query("SELECT COUNT(*) FROM `ipv4_addresses` WHERE `ipv4_address` = '$oid' AND `ipv4_prefixlen` = '$cidr' AND `interface_id` = '$interface_id'"), 0) == '0') {
        mysql_query("INSERT INTO `ipv4_addresses` (`ipv4_address`, `ipv4_prefixlen`, `ipv4_network_id`, `interface_id`) VALUES ('$oid', '$cidr', '$ipv4_network_id', '$interface_id')");
        #echo("Added $oid/$cidr to $interface_id ( $hostname $ifIndex )\n $i_query\n");
        echo("+");
      } else { echo("."); }
      $full_address = "$oid/$cidr|$ifIndex";
      $valid_v4[$full_address] = 1;
    } else { echo("!"); }

  }

  $sql   = "SELECT * FROM ipv4_addresses AS A, ports AS I WHERE I.device_id = '".$device['device_id']."' AND  A.interface_id = I.interface_id";
    $data = mysql_query($sql);
    while($row = mysql_fetch_array($data)) {
      $full_address = $row['ipv4_address'] . "/" . $row['ipv4_prefixlen'] . "|" . $row['ifIndex'];
      if(!$valid_v4[$full_address]) {
        echo("-");
        $query = @mysql_query("DELETE FROM `ipv4_addresses` WHERE `ipv4_address_id` = '".$row['ipv4_address_id']."'");
        if(!mysql_result(mysql_query("SELECT count(*) FROM ipv4_addresses WHERE ipv4_network_id = '".$row['ipv4_network_id']."'"),0)) {
          $query = @mysql_query("DELETE FROM `ipv4_networks` WHERE `ipv4_network_id` = '".$row['ipv4_network_id']."'");
        }
      }
    }

  echo("\n");

  unset($valid_v4);
?>