'use strict';
// @ts-check
// ==================================================================================
// network.js
// ----------------------------------------------------------------------------------
// Description:   System Information - library
//                for Node.js
// Copyright:     (c) 2014 - 2022
// Author:        Sebastian Hildebrandt
// ----------------------------------------------------------------------------------
// License:       MIT
// ==================================================================================
// 9. Network
// ----------------------------------------------------------------------------------

const os = require('os');
const exec = require('child_process').exec;
const execSync = require('child_process').execSync;
const fs = require('fs');
const util = require('./util');

let _platform = process.platform;

const _linux = (_platform === 'linux' || _platform === 'android');
const _darwin = (_platform === 'darwin');
const _windows = (_platform === 'win32');
const _freebsd = (_platform === 'freebsd');
const _openbsd = (_platform === 'openbsd');
const _netbsd = (_platform === 'netbsd');
const _sunos = (_platform === 'sunos');

let _network = {};
let _default_iface = '';
let _ifaces = {};
let _dhcpNics = [];
let _networkInterfaces = [];
let _mac = {};
let pathToIp;

function getDefaultNetworkInterface() {

  let ifacename = '';
  let ifacenameFirst = '';
  try {
    let ifaces = os.networkInterfaces();

    let scopeid = 9999;

    // fallback - "first" external interface (sorted by scopeid)
    for (let dev in ifaces) {
      if ({}.hasOwnProperty.call(ifaces, dev)) {
        ifaces[dev].forEach(function (details) {
          if (details && details.internal === false) {
            ifacenameFirst = ifacenameFirst || dev; // fallback if no scopeid
            if (details.scopeid && details.scopeid < scopeid) {
              ifacename = dev;
              scopeid = details.scopeid;
            }
          }
        });
      }
    }
    ifacename = ifacename || ifacenameFirst || '';

    if (_windows) {
      // https://www.inetdaemon.com/tutorials/internet/ip/routing/default_route.shtml
      let defaultIp = '';
      const cmd = 'netstat -r';
      const result = execSync(cmd, util.execOptsWin);
      const lines = result.toString().split(os.EOL);
      lines.forEach(line => {
        line = line.replace(/\s+/g, ' ').trim();
        if (line.indexOf('0.0.0.0 0.0.0.0') > -1 && !(/[a-zA-Z]/.test(line))) {
          const parts = line.split(' ');
          if (parts.length >= 5) {
            defaultIp = parts[parts.length - 2];
          }
        }
      });
      if (defaultIp) {
        for (let dev in ifaces) {
          if ({}.hasOwnProperty.call(ifaces, dev)) {
            ifaces[dev].forEach(function (details) {
              if (details && details.address && details.address === defaultIp) {
                ifacename = dev;
              }
            });
          }
        }
      }
    }
    if (_linux) {
      let cmd = 'ip route 2> /dev/null | grep default';
      let result = execSync(cmd);
      let parts = result.toString().split('\n')[0].split(/\s+/);
      if (parts[0] === 'none' && parts[5]) {
        ifacename = parts[5];
      } else if (parts[4]) {
        ifacename = parts[4];
      }

      if (ifacename.indexOf(':') > -1) {
        ifacename = ifacename.split(':')[1].trim();
      }
    }
    if (_darwin || _freebsd || _openbsd || _netbsd || _sunos) {
      let cmd = '';
      if (_linux) { cmd = 'ip route 2> /dev/null | grep default | awk \'{print $5}\''; }
      if (_darwin) { cmd = 'route -n get default 2>/dev/null | grep interface: | awk \'{print $2}\''; }
      if (_freebsd || _openbsd || _netbsd || _sunos) { cmd = 'route get 0.0.0.0 | grep interface:'; }
      let result = execSync(cmd);
      ifacename = result.toString().split('\n')[0];
      if (ifacename.indexOf(':') > -1) {
        ifacename = ifacename.split(':')[1].trim();
      }
    }
  } catch (e) {
    util.noop();
  }
  if (ifacename) { _default_iface = ifacename; }
  return _default_iface;
}

exports.getDefaultNetworkInterface = getDefaultNetworkInterface;

function getMacAddresses() {
  let iface = '';
  let mac = '';
  let result = {};
  if (_linux || _freebsd || _openbsd || _netbsd) {
    if (typeof pathToIp === 'undefined') {
      try {
        const lines = execSync('which ip').toString().split('\n');
        if (lines.length && lines[0].indexOf(':') === -1 && lines[0].indexOf('/') === 0) {
          pathToIp = lines[0];
        } else {
          pathToIp = '';
        }
      } catch (e) {
        pathToIp = '';
      }
    }
    try {
      const cmd = 'export LC_ALL=C; ' + ((pathToIp) ? pathToIp + ' link show up' : '/sbin/ifconfig') + '; unset LC_ALL';
      let res = execSync(cmd);
      const lines = res.toString().split('\n');
      for (let i = 0; i < lines.length; i++) {
        if (lines[i] && lines[i][0] !== ' ') {
          if (pathToIp) {
            let nextline = lines[i + 1].trim().split(' ');
            if (nextline[0] === 'link/ether') {
              iface = lines[i].split(' ')[1];
              iface = iface.slice(0, iface.length - 1);
              mac = nextline[1];
            }
          } else {
            iface = lines[i].split(' ')[0];
            mac = lines[i].split('HWaddr ')[1];
          }

          if (iface && mac) {
            result[iface] = mac.trim();
            iface = '';
            mac = '';
          }
        }
      }
    } catch (e) {
      util.noop();
    }
  }
  if (_darwin) {
    try {
      const cmd = '/sbin/ifconfig';
      let res = execSync(cmd);
      const lines = res.toString().split('\n');
      for (let i = 0; i < lines.length; i++) {
        if (lines[i] && lines[i][0] !== '\t' && lines[i].indexOf(':') > 0) {
          iface = lines[i].split(':')[0];
        } else if (lines[i].indexOf('\tether ') === 0) {
          mac = lines[i].split('\tether ')[1];
          if (iface && mac) {
            result[iface] = mac.trim();
            iface = '';
            mac = '';
          }
        }
      }
    } catch (e) {
      util.noop();
    }
  }
  return result;
}

function networkInterfaceDefault(callback) {

  return new Promise((resolve) => {
    process.nextTick(() => {
      let result = getDefaultNetworkInterface();
      if (callback) { callback(result); }
      resolve(result);
    });
  });
}

exports.networkInterfaceDefault = networkInterfaceDefault;

// --------------------------
// NET - interfaces

function parseLinesWindowsNics(sections, nconfigsections) {
  let nics = [];
  for (let i in sections) {
    if ({}.hasOwnProperty.call(sections, i)) {

      if (sections[i].trim() !== '') {

        let lines = sections[i].trim().split('\r\n');
        let linesNicConfig = nconfigsections[i].trim().split('\r\n');
        let netEnabled = util.getValue(lines, 'NetEnabled', ':');
        let adapterType = util.getValue(lines, 'AdapterTypeID', ':') === '9' ? 'wireless' : 'wired';
        let ifacename = util.getValue(lines, 'Name', ':').replace(/\]/g, ')').replace(/\[/g, '(');
        let iface = util.getValue(lines, 'NetConnectionID', ':').replace(/\]/g, ')').replace(/\[/g, '(');
        if (ifacename.toLowerCase().indexOf('wi-fi') >= 0 || ifacename.toLowerCase().indexOf('wireless') >= 0) {
          adapterType = 'wireless';
        }
        if (netEnabled !== '') {
          const speed = parseInt(util.getValue(lines, 'speed', ':').trim(), 10) / 1000000;
          nics.push({
            mac: util.getValue(lines, 'MACAddress', ':').toLowerCase(),
            dhcp: util.getValue(linesNicConfig, 'dhcpEnabled', ':').toLowerCase() === 'true',
            name: ifacename,
            iface,
            netEnabled: netEnabled === 'TRUE',
            speed: isNaN(speed) ? null : speed,
            operstate: util.getValue(lines, 'NetConnectionStatus', ':') === '2' ? 'up' : 'down',
            type: adapterType
          });
        }
      }
    }
  }
  return nics;
}

function getWindowsNics() {
  // const cmd = util.getWmic() + ' nic get /value';
  // const cmdnicconfig = util.getWmic() + ' nicconfig get dhcpEnabled /value';
  return new Promise((resolve) => {
    process.nextTick(() => {
      let cmd = 'Get-WmiObject Win32_NetworkAdapter | fl *' + '; echo \'#-#-#-#\';';
      cmd += 'Get-WmiObject Win32_NetworkAdapterConfiguration | fl DHCPEnabled' + '';
      try {
        util.powerShell(cmd).then(data => {
          data = data.split('#-#-#-#');
          const nsections = data[0].split(/\n\s*\n/);
          const nconfigsections = data[1].split(/\n\s*\n/);
          resolve(parseLinesWindowsNics(nsections, nconfigsections));
        });
      } catch (e) {
        resolve([]);
      }
    });
  });
}

function getWindowsDNSsuffixes() {

  let iface = {};

  let dnsSuffixes = {
    primaryDNS: '',
    exitCode: 0,
    ifaces: [],
  };

  try {
    const ipconfig = execSync('ipconfig /all', util.execOptsWin);
    const ipconfigArray = ipconfig.split('\r\n\r\n');

    ipconfigArray.forEach((element, index) => {

      if (index == 1) {
        const longPrimaryDNS = element.split('\r\n').filter((element) => {
          return element.toUpperCase().includes('DNS');
        });
        const primaryDNS = longPrimaryDNS[0].substring(longPrimaryDNS[0].lastIndexOf(':') + 1);
        dnsSuffixes.primaryDNS = primaryDNS.trim();
        if (!dnsSuffixes.primaryDNS) { dnsSuffixes.primaryDNS = 'Not defined'; }
      }
      if (index > 1) {
        if (index % 2 == 0) {
          const name = element.substring(element.lastIndexOf(' ') + 1).replace(':', '');
          iface.name = name;
        } else {
          const connectionSpecificDNS = element.split('\r\n').filter((element) => {
            return element.toUpperCase().includes('DNS');
          });
          const dnsSuffix = connectionSpecificDNS[0].substring(connectionSpecificDNS[0].lastIndexOf(':') + 1);
          iface.dnsSuffix = dnsSuffix.trim();
          dnsSuffixes.ifaces.push(iface);
          iface = {};
        }
      }
    });

    return dnsSuffixes;
  } catch (error) {
    // console.log('An error occurred trying to bring the Connection-specific DNS suffix', error.message);
    return {
      primaryDNS: '',
      exitCode: 0,
      ifaces: [],
    };
  }
}

function getWindowsIfaceDNSsuffix(ifaces, ifacename) {
  let dnsSuffix = '';
  // Adding (.) to ensure ifacename compatibility when duplicated iface-names
  const interfaceName = ifacename + '.';
  try {
    const connectionDnsSuffix = ifaces.filter((iface) => {
      return interfaceName.includes(iface.name + '.');
    }).map((iface) => iface.dnsSuffix);
    if (connectionDnsSuffix[0]) {
      dnsSuffix = connectionDnsSuffix[0];
    }
    if (!dnsSuffix) { dnsSuffix = ''; }
    return dnsSuffix;
  } catch (error) {
    // console.log('Error getting Connection-specific DNS suffix: ', error.message);
    return 'Unknown';
  }
}

function getWindowsWiredProfilesInformation() {
  try {
    const result = execSync('netsh lan show profiles', util.execOptsWin);
    const profileList = result.split('\r\nProfile on interface');
    return profileList;
  } catch (error) {
    if (error.status === 1 && error.stdout.includes('AutoConfig')) {
      return 'Disabled';
    }
    return [];
  }
}

function getWindowsWirelessIfaceSSID(interfaceName) {
  try {
    const result = execSync(`netsh wlan show  interface name="${interfaceName}" | findstr "SSID"`, util.execOptsWin);
    const SSID = result.split('\r\n').shift();
    const parseSSID = SSID.split(':').pop();
    return parseSSID;
  } catch (error) {
    return 'Unknown';
  }
}
function getWindowsIEEE8021x(connectionType, iface, ifaces) {
  let i8021x = {
    state: 'Unknown',
    protocol: 'Unknown',
  };

  if (ifaces === 'Disabled') {
    i8021x.state = 'Disabled';
    i8021x.protocol = 'Not defined';
    return i8021x;
  }

  if (connectionType == 'wired' && ifaces.length > 0) {
    try {
      // Get 802.1x information by interface name
      const iface8021xInfo = ifaces.find((element) => {
        return element.includes(iface + '\r\n');
      });
      const arrayIface8021xInfo = iface8021xInfo.split('\r\n');
      const state8021x = arrayIface8021xInfo.find((element) => {
        return element.includes('802.1x');
      });

      if (state8021x.includes('Disabled')) {
        i8021x.state = 'Disabled';
        i8021x.protocol = 'Not defined';
      } else if (state8021x.includes('Enabled')) {
        const protocol8021x = arrayIface8021xInfo.find((element) => {
          return element.includes('EAP');
        });
        i8021x.protocol = protocol8021x.split(':').pop();
        i8021x.state = 'Enabled';
      }
    } catch (error) {
      // console.log('Error getting wired information:', error);
      return i8021x;
    }
  } else if (connectionType == 'wireless') {

    let i8021xState = '';
    let i8021xProtocol = '';



    try {
      const SSID = getWindowsWirelessIfaceSSID(iface);
      if (SSID !== 'Unknown') {
        i8021xState = execSync(`netsh wlan show profiles "${SSID}" | findstr "802.1X"`, util.execOptsWin);
        i8021xProtocol = execSync(`netsh wlan show profiles "${SSID}" | findstr "EAP"`, util.execOptsWin);
      }

      if (i8021xState.includes(':') && i8021xProtocol.includes(':')) {
        i8021x.state = i8021xState.split(':').pop();
        i8021x.protocol = i8021xProtocol.split(':').pop();
      }
    } catch (error) {
      // console.log('Error getting wireless information:', error);
      if (error.status === 1 && error.stdout.includes('AutoConfig')) {
        i8021x.state = 'Disabled';
        i8021x.protocol = 'Not defined';
      }
      return i8021x;
    }
  }

  return i8021x;
}

function splitSectionsNics(lines) {
  const result = [];
  let section = [];
  lines.forEach(function (line) {
    if (!line.startsWith('\t') && !line.startsWith(' ')) {
      if (section.length) {
        result.push(section);
        section = [];
      }
    }
    section.push(line);
  });
  if (section.length) {
    result.push(section);
  }
  return result;
}

function parseLinesDarwinNics(sections) {
  let nics = [];
  sections.forEach(section => {
    let nic = {
      iface: '',
      mtu: null,
      mac: '',
      ip6: '',
      ip4: '',
      speed: null,
      type: '',
      operstate: '',
      duplex: '',
      internal: false
    };
    const first = section[0];
    nic.iface = first.split(':')[0].trim();
    let parts = first.split('> mtu');
    nic.mtu = parts.length > 1 ? parseInt(parts[1], 10) : null;
    if (isNaN(nic.mtu)) {
      nic.mtu = null;
    }
    nic.internal = parts[0].toLowerCase().indexOf('loopback') > -1;
    section.forEach(line => {
      if (line.trim().startsWith('ether ')) {
        nic.mac = line.split('ether ')[1].toLowerCase().trim();
      }
      if (line.trim().startsWith('inet6 ') && !nic.ip6) {
        nic.ip6 = line.split('inet6 ')[1].toLowerCase().split('%')[0].split(' ')[0];
      }
      if (line.trim().startsWith('inet ') && !nic.ip4) {
        nic.ip4 = line.split('inet ')[1].toLowerCase().split(' ')[0];
      }
    });
    let speed = util.getValue(section, 'link rate');
    nic.speed = speed ? parseFloat(speed) : null;
    if (nic.speed === null) {
      speed = util.getValue(section, 'uplink rate');
      nic.speed = speed ? parseFloat(speed) : null;
      if (nic.speed !== null && speed.toLowerCase().indexOf('gbps') >= 0) {
        nic.speed = nic.speed * 1000;
      }
    } else {
      if (speed.toLowerCase().indexOf('gbps') >= 0) {
        nic.speed = nic.speed * 1000;
      }
    }
    nic.type = util.getValue(section, 'type').toLowerCase().indexOf('wi-fi') > -1 ? 'wireless' : 'wired';
    nic.operstate = util.getValue(section, 'status').toLowerCase().indexOf('active') > -1 ? 'up' : 'down';
    nic.duplex = util.getValue(section, 'media').toLowerCase().indexOf('half-duplex') > -1 ? 'half' : 'full';
    if (nic.ip6 || nic.ip4 || nic.mac) {
      nics.push(nic);
    }
  });
  return nics;
}

function getDarwinNics() {
  const cmd = '/sbin/ifconfig -v';
  try {
    const lines = execSync(cmd, { maxBuffer: 1024 * 20000 }).toString().split('\n');
    const nsections = splitSectionsNics(lines);
    return (parseLinesDarwinNics(nsections));
  } catch (e) {
    return [];
  }
}

function getLinuxIfaceConnectionName(interfaceName) {
  const cmd = `nmcli device status 2>/dev/null | grep ${interfaceName}`;

  try {
    const result = execSync(cmd).toString();
    const resultFormat = result.replace(/\s+/g, ' ').trim();
    const connectionNameLines = resultFormat.split(' ').slice(3);
    const connectionName = connectionNameLines.join(' ');
    return connectionName != '--' ? connectionName : '';
  } catch (e) {
    return '';
  }
}

function checkLinuxDCHPInterfaces(file) {
  let result = [];
  try {
    let cmd = `cat ${file} 2> /dev/null | grep 'iface\\|source'`;
    const lines = execSync(cmd, { maxBuffer: 1024 * 20000 }).toString().split('\n');

    lines.forEach(line => {
      const parts = line.replace(/\s+/g, ' ').trim().split(' ');
      if (parts.length >= 4) {
        if (line.toLowerCase().indexOf(' inet ') >= 0 && line.toLowerCase().indexOf('dhcp') >= 0) {
          result.push(parts[1]);
        }
      }
      if (line.toLowerCase().includes('source')) {
        let file = line.split(' ')[1];
        result = result.concat(checkLinuxDCHPInterfaces(file));
      }
    });
  } catch (e) {
    util.noop();
  }
  return result;
}

function getLinuxDHCPNics() {
  // alternate methods getting interfaces using DHCP
  let cmd = 'ip a 2> /dev/null';
  let result = [];
  try {
    const lines = execSync(cmd, { maxBuffer: 1024 * 20000 }).toString().split('\n');
    const nsections = splitSectionsNics(lines);
    result = (parseLinuxDHCPNics(nsections));
  } catch (e) {
    util.noop();
  }
  try {
    result = checkLinuxDCHPInterfaces('/etc/network/interfaces');
  } catch (e) {
    util.noop();
  }
  return result;
}

function parseLinuxDHCPNics(sections) {
  const result = [];
  if (sections && sections.length) {
    sections.forEach(lines => {
      if (lines && lines.length) {
        const parts = lines[0].split(':');
        if (parts.length > 2) {
          for (let line of lines) {
            if (line.indexOf(' inet ') >= 0 && line.indexOf(' dynamic ') >= 0) {
              const parts2 = line.split(' ');
              const nic = parts2[parts2.length - 1].trim();
              result.push(nic);
              break;
            }
          }
        }
      }
    });
  }
  return result;
}

function getLinuxIfaceDHCPstatus(iface, connectionName, DHCPNics) {
  let result = false;
  if (connectionName) {
    const cmd = `nmcli connection show "${connectionName}" 2>/dev/null | grep ipv4.method;`;
    try {
      const lines = execSync(cmd).toString();
      const resultFormat = lines.replace(/\s+/g, ' ').trim();

      let dhcStatus = resultFormat.split(' ').slice(1).toString();
      switch (dhcStatus) {
        case 'auto':
          result = true;
          break;

        default:
          result = false;
          break;
      }
      return result;
    } catch (e) {
      return (DHCPNics.indexOf(iface) >= 0);
    }
  } else {
    return (DHCPNics.indexOf(iface) >= 0);
  }
}

function getDarwinIfaceDHCPstatus(iface) {
  let result = false;
  const cmd = `ipconfig getpacket "${iface}" 2>/dev/null | grep lease_time;`;
  try {
    const lines = execSync(cmd).toString().split('\n');
    if (lines.length && lines[0].startsWith('lease_time')) {
      result = true;
    }
  } catch (e) {
    util.noop();
  }
  return result;
}

function getLinuxIfaceDNSsuffix(connectionName) {
  if (connectionName) {
    const cmd = `nmcli connection show "${connectionName}" 2>/dev/null | grep ipv4.dns-search;`;
    try {
      const result = execSync(cmd).toString();
      const resultFormat = result.replace(/\s+/g, ' ').trim();
      const dnsSuffix = resultFormat.split(' ').slice(1).toString();
      return dnsSuffix == '--' ? 'Not defined' : dnsSuffix;
    } catch (e) {
      return 'Unknown';
    }
  } else {
    return 'Unknown';
  }
}

function getLinuxIfaceIEEE8021xAuth(connectionName) {
  if (connectionName) {
    const cmd = `nmcli connection show "${connectionName}" 2>/dev/null | grep 802-1x.eap;`;
    try {
      const result = execSync(cmd).toString();
      const resultFormat = result.replace(/\s+/g, ' ').trim();
      const authenticationProtocol = resultFormat.split(' ').slice(1).toString();


      return authenticationProtocol == '--' ? '' : authenticationProtocol;
    } catch (e) {
      return 'Not defined';
    }
  } else {
    return 'Not defined';
  }
}

function getLinuxIfaceIEEE8021xState(authenticationProtocol) {
  if (authenticationProtocol) {
    if (authenticationProtocol == 'Not defined') {
      return 'Disabled';
    }
    return 'Enabled';
  } else {
    return 'Unknown';
  }
}

function testVirtualNic(iface, ifaceName, mac) {
  const virtualMacs = ['00:00:00:00:00:00', '00:03:FF', '00:05:69', '00:0C:29', '00:0F:4B', '00:0F:4B', '00:13:07', '00:13:BE', '00:15:5d', '00:16:3E', '00:1C:42', '00:21:F6', '00:21:F6', '00:24:0B', '00:24:0B', '00:50:56', '00:A0:B1', '00:E0:C8', '08:00:27', '0A:00:27', '18:92:2C', '16:DF:49', '3C:F3:92', '54:52:00', 'FC:15:97'];
  if (mac) {
    return virtualMacs.filter(item => { return mac.toUpperCase().toUpperCase().startsWith(item.substr(0, mac.length)); }).length > 0 ||
      iface.toLowerCase().indexOf(' virtual ') > -1 ||
      ifaceName.toLowerCase().indexOf(' virtual ') > -1 ||
      iface.toLowerCase().indexOf('vethernet ') > -1 ||
      ifaceName.toLowerCase().indexOf('vethernet ') > -1 ||
      iface.toLowerCase().startsWith('veth') ||
      ifaceName.toLowerCase().startsWith('veth') ||
      iface.toLowerCase().startsWith('vboxnet') ||
      ifaceName.toLowerCase().startsWith('vboxnet');
  } else { return false; }
}

function networkInterfaces(callback, rescan) {

  if (typeof callback === 'boolean') {
    rescan = callback;
    callback = null;
  }
  if (typeof rescan === 'undefined') {
    rescan = true;
  }
  return new Promise((resolve) => {
    process.nextTick(() => {
      let ifaces = os.networkInterfaces();

      let result = [];
      let nics = [];
      let dnsSuffixes = [];
      let nics8021xInfo = [];
      // seperate handling in OSX
      if (_darwin || _freebsd || _openbsd || _netbsd) {
        nics = getDarwinNics();


        nics.forEach(nic => {

          if ({}.hasOwnProperty.call(ifaces, nic.iface)) {
            ifaces[nic.iface].forEach(function (details) {
              if (details.family === 'IPv4') {
                nic.ip4subnet = details.netmask;
              }
              if (details.family === 'IPv6') {
                nic.ip6subnet = details.netmask;
              }
            });
          }

          result.push({
            iface: nic.iface,
            ifaceName: nic.iface,
            ip4: nic.ip4,
            ip4subnet: nic.ip4subnet || '',
            ip6: nic.ip6,
            ip6subnet: nic.ip6subnet || '',
            mac: nic.mac,
            internal: nic.internal,
            virtual: nic.internal ? false : testVirtualNic(nic.iface, nic.iface, nic.mac),
            operstate: nic.operstate,
            type: nic.type,
            duplex: nic.duplex,
            mtu: nic.mtu,
            speed: nic.speed,
            dhcp: getDarwinIfaceDHCPstatus(nic.iface),
            dnsSuffix: '',
            ieee8021xAuth: '',
            ieee8021xState: '',
            carrierChanges: 0
          });
        });
        _networkInterfaces = result;
        if (callback) { callback(result); }
        resolve(result);
      }
      if (_linux) {
        if ((JSON.stringify(ifaces) === JSON.stringify(_ifaces)) && !rescan) {
          // no changes - just return object
          result = _networkInterfaces;

          if (callback) { callback(result); }
          resolve(result);
        } else {
          _ifaces = JSON.parse(JSON.stringify(ifaces));
          _dhcpNics = getLinuxDHCPNics();
          for (let dev in ifaces) {
            let ip4 = '';
            let ip4subnet = '';
            let ip6 = '';
            let ip6subnet = '';
            let mac = '';
            let duplex = '';
            let mtu = '';
            let speed = null;
            let carrierChanges = 0;
            let dhcp = false;
            let dnsSuffix = '';
            let ieee8021xAuth = '';
            let ieee8021xState = '';
            let type = '';

            if ({}.hasOwnProperty.call(ifaces, dev)) {
              let ifaceName = dev;
              ifaces[dev].forEach(function (details) {
                if (details.family === 'IPv4') {
                  ip4 = details.address;
                  ip4subnet = details.netmask;
                }
                if (details.family === 'IPv6') {
                  if (!ip6 || ip6.match(/^fe80::/i)) {
                    ip6 = details.address;
                    ip6subnet = details.netmask;
                  }
                }
                mac = details.mac;
                // fallback due to https://github.com/nodejs/node/issues/13581 (node 8.1 - node 8.2)
                const nodeMainVersion = parseInt(process.versions.node.split('.'), 10);
                if (mac.indexOf('00:00:0') > -1 && (_linux || _darwin) && (!details.internal) && nodeMainVersion >= 8 && nodeMainVersion <= 11) {
                  if (Object.keys(_mac).length === 0) {
                    _mac = getMacAddresses();
                  }
                  mac = _mac[dev] || '';
                }
              });
              let iface = dev.split(':')[0].trim().toLowerCase();
              const cmd = `echo -n "addr_assign_type: "; cat /sys/class/net/${iface}/addr_assign_type 2>/dev/null; echo;
            echo -n "address: "; cat /sys/class/net/${iface}/address 2>/dev/null; echo;
            echo -n "addr_len: "; cat /sys/class/net/${iface}/addr_len 2>/dev/null; echo;
            echo -n "broadcast: "; cat /sys/class/net/${iface}/broadcast 2>/dev/null; echo;
            echo -n "carrier: "; cat /sys/class/net/${iface}/carrier 2>/dev/null; echo;
            echo -n "carrier_changes: "; cat /sys/class/net/${iface}/carrier_changes 2>/dev/null; echo;
            echo -n "dev_id: "; cat /sys/class/net/${iface}/dev_id 2>/dev/null; echo;
            echo -n "dev_port: "; cat /sys/class/net/${iface}/dev_port 2>/dev/null; echo;
            echo -n "dormant: "; cat /sys/class/net/${iface}/dormant 2>/dev/null; echo;
            echo -n "duplex: "; cat /sys/class/net/${iface}/duplex 2>/dev/null; echo;
            echo -n "flags: "; cat /sys/class/net/${iface}/flags 2>/dev/null; echo;
            echo -n "gro_flush_timeout: "; cat /sys/class/net/${iface}/gro_flush_timeout 2>/dev/null; echo;
            echo -n "ifalias: "; cat /sys/class/net/${iface}/ifalias 2>/dev/null; echo;
            echo -n "ifindex: "; cat /sys/class/net/${iface}/ifindex 2>/dev/null; echo;
            echo -n "iflink: "; cat /sys/class/net/${iface}/iflink 2>/dev/null; echo;
            echo -n "link_mode: "; cat /sys/class/net/${iface}/link_mode 2>/dev/null; echo;
            echo -n "mtu: "; cat /sys/class/net/${iface}/mtu 2>/dev/null; echo;
            echo -n "netdev_group: "; cat /sys/class/net/${iface}/netdev_group 2>/dev/null; echo;
            echo -n "operstate: "; cat /sys/class/net/${iface}/operstate 2>/dev/null; echo;
            echo -n "proto_down: "; cat /sys/class/net/${iface}/proto_down 2>/dev/null; echo;
            echo -n "speed: "; cat /sys/class/net/${iface}/speed 2>/dev/null; echo;
            echo -n "tx_queue_len: "; cat /sys/class/net/${iface}/tx_queue_len 2>/dev/null; echo;
            echo -n "type: "; cat /sys/class/net/${iface}/type 2>/dev/null; echo;
            echo -n "wireless: "; cat /proc/net/wireless 2>/dev/null | grep ${iface}; echo;
            echo -n "wirelessspeed: "; iw dev ${iface} link 2>&1 | grep bitrate; echo;`;

              let lines = [];
              try {
                lines = execSync(cmd).toString().split('\n');
                const connectionName = getLinuxIfaceConnectionName(iface);
                dhcp = getLinuxIfaceDHCPstatus(iface, connectionName, _dhcpNics);
                dnsSuffix = getLinuxIfaceDNSsuffix(connectionName);
                ieee8021xAuth = getLinuxIfaceIEEE8021xAuth(connectionName);
                ieee8021xState = getLinuxIfaceIEEE8021xState(ieee8021xAuth);
              } catch (e) {
                util.noop();
              }
              duplex = util.getValue(lines, 'duplex');
              duplex = duplex.startsWith('cat') ? '' : duplex;
              mtu = parseInt(util.getValue(lines, 'mtu'), 10);
              let myspeed = parseInt(util.getValue(lines, 'speed'), 10);
              speed = isNaN(myspeed) ? null : myspeed;
              let wirelessspeed = util.getValue(lines, 'wirelessspeed').split('tx bitrate: ');
              if (speed === null && wirelessspeed.length === 2) {
                myspeed = parseFloat(wirelessspeed[1]);
                speed = isNaN(myspeed) ? null : myspeed;
              }
              carrierChanges = parseInt(util.getValue(lines, 'carrier_changes'), 10);
              const operstate = util.getValue(lines, 'operstate');
              type = operstate === 'up' ? (util.getValue(lines, 'wireless').trim() ? 'wireless' : 'wired') : 'unknown';
              if (iface === 'lo' || iface.startsWith('bond')) { type = 'virtual'; }

              let internal = (ifaces[dev] && ifaces[dev][0]) ? ifaces[dev][0].internal : false;
              if (dev.toLowerCase().indexOf('loopback') > -1 || ifaceName.toLowerCase().indexOf('loopback') > -1) {
                internal = true;
              }
              const virtual = internal ? false : testVirtualNic(dev, ifaceName, mac);
              result.push({
                iface,
                ifaceName,
                ip4,
                ip4subnet,
                ip6,
                ip6subnet,
                mac,
                internal,
                virtual,
                operstate,
                type,
                duplex,
                mtu,
                speed,
                dhcp,
                dnsSuffix,
                ieee8021xAuth,
                ieee8021xState,
                carrierChanges,
              });
            }
          }
          _networkInterfaces = result;
          if (callback) { callback(result); }
          resolve(result);
        }
      }
      if (_windows) {
        if ((JSON.stringify(ifaces) === JSON.stringify(_ifaces)) && !rescan) {
          // no changes - just return object
          result = _networkInterfaces;

          if (callback) { callback(result); }
          resolve(result);
        } else {
          _ifaces = JSON.parse(JSON.stringify(ifaces));

          getWindowsNics().then(function (nics) {
            nics.forEach(nic => {
              let found = false;
              Object.keys(ifaces).forEach(key => {
                if (!found) {
                  ifaces[key].forEach(value => {
                    if (Object.keys(value).indexOf('mac') >= 0) {
                      found = value['mac'] === nic.mac;
                    }
                  });
                }
              });

              if (!found) {
                ifaces[nic.name] = [{ mac: nic.mac }];
              }
            });
            nics8021xInfo = getWindowsWiredProfilesInformation();
            dnsSuffixes = getWindowsDNSsuffixes();
            for (let dev in ifaces) {
              let iface = dev;
              let ip4 = '';
              let ip4subnet = '';
              let ip6 = '';
              let ip6subnet = '';
              let mac = '';
              let duplex = '';
              let mtu = '';
              let speed = null;
              let carrierChanges = 0;
              let operstate = 'down';
              let dhcp = false;
              let dnsSuffix = '';
              let ieee8021xAuth = '';
              let ieee8021xState = '';
              let type = '';

              if ({}.hasOwnProperty.call(ifaces, dev)) {
                let ifaceName = dev;
                ifaces[dev].forEach(function (details) {
                  if (details.family === 'IPv4') {
                    ip4 = details.address;
                    ip4subnet = details.netmask;
                  }
                  if (details.family === 'IPv6') {
                    if (!ip6 || ip6.match(/^fe80::/i)) {
                      ip6 = details.address;
                      ip6subnet = details.netmask;
                    }
                  }
                  mac = details.mac;
                  // fallback due to https://github.com/nodejs/node/issues/13581 (node 8.1 - node 8.2)
                  const nodeMainVersion = parseInt(process.versions.node.split('.'), 10);
                  if (mac.indexOf('00:00:0') > -1 && (_linux || _darwin) && (!details.internal) && nodeMainVersion >= 8 && nodeMainVersion <= 11) {
                    if (Object.keys(_mac).length === 0) {
                      _mac = getMacAddresses();
                    }
                    mac = _mac[dev] || '';
                  }
                });



                dnsSuffix = getWindowsIfaceDNSsuffix(dnsSuffixes.ifaces, dev);
                let foundFirst = false;
                nics.forEach(detail => {
                  if (detail.mac === mac && !foundFirst) {
                    iface = detail.iface || iface;
                    ifaceName = detail.name;
                    dhcp = detail.dhcp;
                    operstate = detail.operstate;
                    speed = detail.speed;
                    type = detail.type;
                    foundFirst = true;
                  }
                });

                if (dev.toLowerCase().indexOf('wlan') >= 0 || ifaceName.toLowerCase().indexOf('wlan') >= 0 || ifaceName.toLowerCase().indexOf('802.11n') >= 0 || ifaceName.toLowerCase().indexOf('wireless') >= 0 || ifaceName.toLowerCase().indexOf('wi-fi') >= 0 || ifaceName.toLowerCase().indexOf('wifi') >= 0) {
                  type = 'wireless';
                }

                const IEEE8021x = getWindowsIEEE8021x(type, dev, nics8021xInfo);
                ieee8021xAuth = IEEE8021x.protocol;
                ieee8021xState = IEEE8021x.state;
                let internal = (ifaces[dev] && ifaces[dev][0]) ? ifaces[dev][0].internal : false;
                if (dev.toLowerCase().indexOf('loopback') > -1 || ifaceName.toLowerCase().indexOf('loopback') > -1) {
                  internal = true;
                }
                const virtual = internal ? false : testVirtualNic(dev, ifaceName, mac);
                result.push({
                  iface,
                  ifaceName,
                  ip4,
                  ip4subnet,
                  ip6,
                  ip6subnet,
                  mac,
                  internal,
                  virtual,
                  operstate,
                  type,
                  duplex,
                  mtu,
                  speed,
                  dhcp,
                  dnsSuffix,
                  ieee8021xAuth,
                  ieee8021xState,
                  carrierChanges,
                });
              }
            }
            _networkInterfaces = result;
            if (callback) { callback(result); }
            resolve(result);
          });
        }
      }
    });
  });
}

exports.networkInterfaces = networkInterfaces;

// --------------------------
// NET - Speed

function calcNetworkSpeed(iface, rx_bytes, tx_bytes, operstate, rx_dropped, rx_errors, tx_dropped, tx_errors) {
  let result = {
    iface,
    operstate,
    rx_bytes,
    rx_dropped,
    rx_errors,
    tx_bytes,
    tx_dropped,
    tx_errors,
    rx_sec: null,
    tx_sec: null,
    ms: 0
  };

  if (_network[iface] && _network[iface].ms) {
    result.ms = Date.now() - _network[iface].ms;
    result.rx_sec = (rx_bytes - _network[iface].rx_bytes) >= 0 ? (rx_bytes - _network[iface].rx_bytes) / (result.ms / 1000) : 0;
    result.tx_sec = (tx_bytes - _network[iface].tx_bytes) >= 0 ? (tx_bytes - _network[iface].tx_bytes) / (result.ms / 1000) : 0;
    _network[iface].rx_bytes = rx_bytes;
    _network[iface].tx_bytes = tx_bytes;
    _network[iface].rx_sec = result.rx_sec;
    _network[iface].tx_sec = result.tx_sec;
    _network[iface].ms = Date.now();
    _network[iface].last_ms = result.ms;
    _network[iface].operstate = operstate;
  } else {
    if (!_network[iface]) { _network[iface] = {}; }
    _network[iface].rx_bytes = rx_bytes;
    _network[iface].tx_bytes = tx_bytes;
    _network[iface].rx_sec = null;
    _network[iface].tx_sec = null;
    _network[iface].ms = Date.now();
    _network[iface].last_ms = 0;
    _network[iface].operstate = operstate;
  }
  return result;
}

function networkStats(ifaces, callback) {

  let ifacesArray = [];

  return new Promise((resolve) => {
    process.nextTick(() => {

      // fallback - if only callback is given
      if (util.isFunction(ifaces) && !callback) {
        callback = ifaces;
        ifacesArray = [getDefaultNetworkInterface()];
      } else {
        if (typeof ifaces !== 'string' && ifaces !== undefined) {
          if (callback) { callback([]); }
          return resolve([]);
        }
        ifaces = ifaces || getDefaultNetworkInterface();

        ifaces.__proto__.toLowerCase = util.stringToLower;
        ifaces.__proto__.replace = util.stringReplace;
        ifaces.__proto__.trim = util.stringTrim;

        ifaces = ifaces.trim().toLowerCase().replace(/,+/g, '|');
        ifacesArray = ifaces.split('|');
      }

      const result = [];

      const workload = [];
      if (ifacesArray.length && ifacesArray[0].trim() === '*') {
        ifacesArray = [];
        networkInterfaces(false).then(allIFaces => {
          for (let iface of allIFaces) {
            ifacesArray.push(iface.iface);
          }
          networkStats(ifacesArray.join(',')).then(result => {
            if (callback) { callback(result); }
            resolve(result);
          });
        });
      } else {
        for (let iface of ifacesArray) {
          workload.push(networkStatsSingle(iface.trim()));
        }
        if (workload.length) {
          Promise.all(
            workload
          ).then(data => {
            if (callback) { callback(data); }
            resolve(data);
          });
        } else {
          if (callback) { callback(result); }
          resolve(result);
        }
      }
    });
  });
}

function networkStatsSingle(iface) {

  function parseLinesWindowsPerfData(sections) {
    let perfData = [];
    for (let i in sections) {
      if ({}.hasOwnProperty.call(sections, i)) {
        if (sections[i].trim() !== '') {
          let lines = sections[i].trim().split('\r\n');
          perfData.push({
            name: util.getValue(lines, 'Name', ':').replace(/[()[\] ]+/g, '').replace('#', '_').toLowerCase(),
            rx_bytes: parseInt(util.getValue(lines, 'BytesReceivedPersec', ':'), 10),
            rx_errors: parseInt(util.getValue(lines, 'PacketsReceivedErrors', ':'), 10),
            rx_dropped: parseInt(util.getValue(lines, 'PacketsReceivedDiscarded', ':'), 10),
            tx_bytes: parseInt(util.getValue(lines, 'BytesSentPersec', ':'), 10),
            tx_errors: parseInt(util.getValue(lines, 'PacketsOutboundErrors', ':'), 10),
            tx_dropped: parseInt(util.getValue(lines, 'PacketsOutboundDiscarded', ':'), 10)
          });
        }
      }
    }
    return perfData;
  }

  return new Promise((resolve) => {
    process.nextTick(() => {
      let ifaceSanitized = '';
      const s = util.isPrototypePolluted() ? '---' : util.sanitizeShellString(iface);
      for (let i = 0; i <= util.mathMin(s.length, 2000); i++) {
        if (!(s[i] === undefined)) {
          ifaceSanitized = ifaceSanitized + s[i];
        }
      }

      let result = {
        iface: ifaceSanitized,
        operstate: 'unknown',
        rx_bytes: 0,
        rx_dropped: 0,
        rx_errors: 0,
        tx_bytes: 0,
        tx_dropped: 0,
        tx_errors: 0,
        rx_sec: null,
        tx_sec: null,
        ms: 0
      };

      let operstate = 'unknown';
      let rx_bytes = 0;
      let tx_bytes = 0;
      let rx_dropped = 0;
      let rx_errors = 0;
      let tx_dropped = 0;
      let tx_errors = 0;

      let cmd, lines, stats;
      if (!_network[ifaceSanitized] || (_network[ifaceSanitized] && !_network[ifaceSanitized].ms) || (_network[ifaceSanitized] && _network[ifaceSanitized].ms && Date.now() - _network[ifaceSanitized].ms >= 500)) {
        if (_linux) {
          if (fs.existsSync('/sys/class/net/' + ifaceSanitized)) {
            cmd =
              'cat /sys/class/net/' + ifaceSanitized + '/operstate; ' +
              'cat /sys/class/net/' + ifaceSanitized + '/statistics/rx_bytes; ' +
              'cat /sys/class/net/' + ifaceSanitized + '/statistics/tx_bytes; ' +
              'cat /sys/class/net/' + ifaceSanitized + '/statistics/rx_dropped; ' +
              'cat /sys/class/net/' + ifaceSanitized + '/statistics/rx_errors; ' +
              'cat /sys/class/net/' + ifaceSanitized + '/statistics/tx_dropped; ' +
              'cat /sys/class/net/' + ifaceSanitized + '/statistics/tx_errors; ';
            exec(cmd, function (error, stdout) {
              if (!error) {
                lines = stdout.toString().split('\n');
                operstate = lines[0].trim();
                rx_bytes = parseInt(lines[1], 10);
                tx_bytes = parseInt(lines[2], 10);
                rx_dropped = parseInt(lines[3], 10);
                rx_errors = parseInt(lines[4], 10);
                tx_dropped = parseInt(lines[5], 10);
                tx_errors = parseInt(lines[6], 10);

                result = calcNetworkSpeed(ifaceSanitized, rx_bytes, tx_bytes, operstate, rx_dropped, rx_errors, tx_dropped, tx_errors);

              }
              resolve(result);
            });
          } else {
            resolve(result);
          }
        }
        if (_freebsd || _openbsd || _netbsd) {
          cmd = 'netstat -ibndI ' + ifaceSanitized;   // lgtm [js/shell-command-constructed-from-input]
          exec(cmd, function (error, stdout) {
            if (!error) {
              lines = stdout.toString().split('\n');
              for (let i = 1; i < lines.length; i++) {
                const line = lines[i].replace(/ +/g, ' ').split(' ');
                if (line && line[0] && line[7] && line[10]) {
                  rx_bytes = rx_bytes + parseInt(line[7]);
                  if (line[6].trim() !== '-') { rx_dropped = rx_dropped + parseInt(line[6]); }
                  if (line[5].trim() !== '-') { rx_errors = rx_errors + parseInt(line[5]); }
                  tx_bytes = tx_bytes + parseInt(line[10]);
                  if (line[12].trim() !== '-') { tx_dropped = tx_dropped + parseInt(line[12]); }
                  if (line[9].trim() !== '-') { tx_errors = tx_errors + parseInt(line[9]); }
                  operstate = 'up';
                }
              }
              result = calcNetworkSpeed(ifaceSanitized, rx_bytes, tx_bytes, operstate, rx_dropped, rx_errors, tx_dropped, tx_errors);
            }
            resolve(result);
          });
        }
        if (_darwin) {
          cmd = 'ifconfig ' + ifaceSanitized + ' | grep "status"';    // lgtm [js/shell-command-constructed-from-input]
          exec(cmd, function (error, stdout) {
            result.operstate = (stdout.toString().split(':')[1] || '').trim();
            result.operstate = (result.operstate || '').toLowerCase();
            result.operstate = (result.operstate === 'active' ? 'up' : (result.operstate === 'inactive' ? 'down' : 'unknown'));
            cmd = 'netstat -bdI ' + ifaceSanitized;   // lgtm [js/shell-command-constructed-from-input]
            exec(cmd, function (error, stdout) {
              if (!error) {
                lines = stdout.toString().split('\n');
                // if there is less than 2 lines, no information for this interface was found
                if (lines.length > 1 && lines[1].trim() !== '') {
                  // skip header line
                  // use the second line because it is tied to the NIC instead of the ipv4 or ipv6 address
                  stats = lines[1].replace(/ +/g, ' ').split(' ');
                  const offset = stats.length > 11 ? 1 : 0;
                  rx_bytes = parseInt(stats[offset + 5]);
                  rx_dropped = parseInt(stats[offset + 10]);
                  rx_errors = parseInt(stats[offset + 4]);
                  tx_bytes = parseInt(stats[offset + 8]);
                  tx_dropped = parseInt(stats[offset + 10]);
                  tx_errors = parseInt(stats[offset + 7]);
                  result = calcNetworkSpeed(ifaceSanitized, rx_bytes, tx_bytes, result.operstate, rx_dropped, rx_errors, tx_dropped, tx_errors);
                }
              }
              resolve(result);
            });
          });
        }
        if (_windows) {
          let perfData = [];
          let ifaceName = ifaceSanitized;

          // Performance Data
          util.powerShell('Get-WmiObject Win32_PerfRawData_Tcpip_NetworkInterface | fl *').then((stdout, error) => {
            if (!error) {
              const psections = stdout.toString().split(/\n\s*\n/);
              perfData = parseLinesWindowsPerfData(psections);
            }

            // Network Interfaces
            networkInterfaces(false).then(interfaces => {
              // get bytes sent, received from perfData by name
              rx_bytes = 0;
              tx_bytes = 0;
              perfData.forEach(detail => {
                interfaces.forEach(det => {
                  if ((det.iface.toLowerCase() === ifaceSanitized.toLowerCase() ||
                    det.mac.toLowerCase() === ifaceSanitized.toLowerCase() ||
                    det.ip4.toLowerCase() === ifaceSanitized.toLowerCase() ||
                    det.ip6.toLowerCase() === ifaceSanitized.toLowerCase() ||
                    det.ifaceName.replace(/[()[\] ]+/g, '').replace('#', '_').toLowerCase() === ifaceSanitized.replace(/[()[\] ]+/g, '').replace('#', '_').toLowerCase()) &&
                    (det.ifaceName.replace(/[()[\] ]+/g, '').replace('#', '_').toLowerCase() === detail.name)) {
                    ifaceName = det.iface;
                    rx_bytes = detail.rx_bytes;
                    rx_dropped = detail.rx_dropped;
                    rx_errors = detail.rx_errors;
                    tx_bytes = detail.tx_bytes;
                    tx_dropped = detail.tx_dropped;
                    tx_errors = detail.tx_errors;
                    operstate = det.operstate;
                  }
                });
              });
              if (rx_bytes && tx_bytes) {
                result = calcNetworkSpeed(ifaceName, parseInt(rx_bytes), parseInt(tx_bytes), operstate, rx_dropped, rx_errors, tx_dropped, tx_errors);
              }
              resolve(result);
            });
          });
        }
      } else {
        result.rx_bytes = _network[ifaceSanitized].rx_bytes;
        result.tx_bytes = _network[ifaceSanitized].tx_bytes;
        result.rx_sec = _network[ifaceSanitized].rx_sec;
        result.tx_sec = _network[ifaceSanitized].tx_sec;
        result.ms = _network[ifaceSanitized].last_ms;
        result.operstate = _network[ifaceSanitized].operstate;
        resolve(result);
      }
    });
  });
}

exports.networkStats = networkStats;

// --------------------------
// NET - connections (sockets)

function networkConnections(callback) {

  return new Promise((resolve) => {
    process.nextTick(() => {
      let result = [];
      if (_linux || _freebsd || _openbsd || _netbsd) {
        let cmd = 'export LC_ALL=C; netstat -tunap | grep "ESTABLISHED\\|SYN_SENT\\|SYN_RECV\\|FIN_WAIT1\\|FIN_WAIT2\\|TIME_WAIT\\|CLOSE\\|CLOSE_WAIT\\|LAST_ACK\\|LISTEN\\|CLOSING\\|UNKNOWN"; unset LC_ALL';
        if (_freebsd || _openbsd || _netbsd) { cmd = 'export LC_ALL=C; netstat -na | grep "ESTABLISHED\\|SYN_SENT\\|SYN_RECV\\|FIN_WAIT1\\|FIN_WAIT2\\|TIME_WAIT\\|CLOSE\\|CLOSE_WAIT\\|LAST_ACK\\|LISTEN\\|CLOSING\\|UNKNOWN"; unset LC_ALL'; }
        exec(cmd, { maxBuffer: 1024 * 20000 }, function (error, stdout) {
          let lines = stdout.toString().split('\n');
          if (!error && (lines.length > 1 || lines[0] != '')) {
            lines.forEach(function (line) {
              line = line.replace(/ +/g, ' ').split(' ');
              if (line.length >= 7) {
                let localip = line[3];
                let localport = '';
                let localaddress = line[3].split(':');
                if (localaddress.length > 1) {
                  localport = localaddress[localaddress.length - 1];
                  localaddress.pop();
                  localip = localaddress.join(':');
                }
                let peerip = line[4];
                let peerport = '';
                let peeraddress = line[4].split(':');
                if (peeraddress.length > 1) {
                  peerport = peeraddress[peeraddress.length - 1];
                  peeraddress.pop();
                  peerip = peeraddress.join(':');
                }
                let connstate = line[5];
                // if (connstate === 'VERBUNDEN') connstate = 'ESTABLISHED';
                let proc = line[6].split('/');

                if (connstate) {
                  result.push({
                    protocol: line[0],
                    localAddress: localip,
                    localPort: localport,
                    peerAddress: peerip,
                    peerPort: peerport,
                    state: connstate,
                    pid: proc[0] && proc[0] !== '-' ? parseInt(proc[0], 10) : null,
                    process: proc[1] ? proc[1].split(' ')[0] : ''
                  });
                }
              }
            });
            if (callback) {
              callback(result);
            }
            resolve(result);
          } else {
            cmd = 'ss -tunap | grep "ESTAB\\|SYN-SENT\\|SYN-RECV\\|FIN-WAIT1\\|FIN-WAIT2\\|TIME-WAIT\\|CLOSE\\|CLOSE-WAIT\\|LAST-ACK\\|LISTEN\\|CLOSING"';
            exec(cmd, { maxBuffer: 1024 * 20000 }, function (error, stdout) {

              if (!error) {
                let lines = stdout.toString().split('\n');
                lines.forEach(function (line) {
                  line = line.replace(/ +/g, ' ').split(' ');
                  if (line.length >= 6) {
                    let localip = line[4];
                    let localport = '';
                    let localaddress = line[4].split(':');
                    if (localaddress.length > 1) {
                      localport = localaddress[localaddress.length - 1];
                      localaddress.pop();
                      localip = localaddress.join(':');
                    }
                    let peerip = line[5];
                    let peerport = '';
                    let peeraddress = line[5].split(':');
                    if (peeraddress.length > 1) {
                      peerport = peeraddress[peeraddress.length - 1];
                      peeraddress.pop();
                      peerip = peeraddress.join(':');
                    }
                    let connstate = line[1];
                    if (connstate === 'ESTAB') { connstate = 'ESTABLISHED'; }
                    if (connstate === 'TIME-WAIT') { connstate = 'TIME_WAIT'; }
                    let pid = null;
                    let process = '';
                    if (line.length >= 7 && line[6].indexOf('users:') > -1) {
                      let proc = line[6].replace('users:(("', '').replace(/"/g, '').split(',');
                      if (proc.length > 2) {
                        process = proc[0].split(' ')[0];
                        pid = parseInt(proc[1], 10);
                      }
                    }
                    if (connstate) {
                      result.push({
                        protocol: line[0],
                        localAddress: localip,
                        localPort: localport,
                        peerAddress: peerip,
                        peerPort: peerport,
                        state: connstate,
                        pid,
                        process
                      });
                    }
                  }
                });
              }
              if (callback) {
                callback(result);
              }
              resolve(result);
            });
          }
        });
      }
      if (_darwin) {
        let cmd = 'netstat -natv | grep "ESTABLISHED\\|SYN_SENT\\|SYN_RECV\\|FIN_WAIT1\\|FIN_WAIT2\\|TIME_WAIT\\|CLOSE\\|CLOSE_WAIT\\|LAST_ACK\\|LISTEN\\|CLOSING\\|UNKNOWN"';
        exec(cmd, { maxBuffer: 1024 * 20000 }, function (error, stdout) {
          if (!error) {

            let lines = stdout.toString().split('\n');

            lines.forEach(function (line) {
              line = line.replace(/ +/g, ' ').split(' ');
              if (line.length >= 8) {
                let localip = line[3];
                let localport = '';
                let localaddress = line[3].split('.');
                if (localaddress.length > 1) {
                  localport = localaddress[localaddress.length - 1];
                  localaddress.pop();
                  localip = localaddress.join('.');
                }
                let peerip = line[4];
                let peerport = '';
                let peeraddress = line[4].split('.');
                if (peeraddress.length > 1) {
                  peerport = peeraddress[peeraddress.length - 1];
                  peeraddress.pop();
                  peerip = peeraddress.join('.');
                }
                let connstate = line[5];
                let pid = parseInt(line[8], 10);
                if (connstate) {
                  result.push({
                    protocol: line[0],
                    localAddress: localip,
                    localPort: localport,
                    peerAddress: peerip,
                    peerPort: peerport,
                    state: connstate,
                    pid: pid,
                    process: ''
                  });
                }
              }
            });
            if (callback) {
              callback(result);
            }
            resolve(result);
          }
        });
      }
      if (_windows) {
        let cmd = 'netstat -nao';
        try {
          exec(cmd, util.execOptsWin, function (error, stdout) {
            if (!error) {

              let lines = stdout.toString().split('\r\n');

              lines.forEach(function (line) {
                line = line.trim().replace(/ +/g, ' ').split(' ');
                if (line.length >= 4) {
                  let localip = line[1];
                  let localport = '';
                  let localaddress = line[1].split(':');
                  if (localaddress.length > 1) {
                    localport = localaddress[localaddress.length - 1];
                    localaddress.pop();
                    localip = localaddress.join(':');
                  }
                  let peerip = line[2];
                  let peerport = '';
                  let peeraddress = line[2].split(':');
                  if (peeraddress.length > 1) {
                    peerport = peeraddress[peeraddress.length - 1];
                    peeraddress.pop();
                    peerip = peeraddress.join(':');
                  }
                  let pid = util.toInt(line[4]);
                  let connstate = line[3];
                  if (connstate === 'HERGESTELLT') { connstate = 'ESTABLISHED'; }
                  if (connstate.startsWith('ABH')) { connstate = 'LISTEN'; }
                  if (connstate === 'SCHLIESSEN_WARTEN') { connstate = 'CLOSE_WAIT'; }
                  if (connstate === 'WARTEND') { connstate = 'TIME_WAIT'; }
                  if (connstate === 'SYN_GESENDET') { connstate = 'SYN_SENT'; }

                  if (connstate === 'LISTENING') { connstate = 'LISTEN'; }
                  if (connstate === 'SYN_RECEIVED') { connstate = 'SYN_RECV'; }
                  if (connstate === 'FIN_WAIT_1') { connstate = 'FIN_WAIT1'; }
                  if (connstate === 'FIN_WAIT_2') { connstate = 'FIN_WAIT2'; }
                  if (connstate) {
                    result.push({
                      protocol: line[0].toLowerCase(),
                      localAddress: localip,
                      localPort: localport,
                      peerAddress: peerip,
                      peerPort: peerport,
                      state: connstate,
                      pid,
                      process: ''
                    });
                  }
                }
              });
              if (callback) {
                callback(result);
              }
              resolve(result);
            }
          });
        } catch (e) {
          if (callback) { callback(result); }
          resolve(result);
        }
      }
    });
  });
}

exports.networkConnections = networkConnections;

function networkGatewayDefault(callback) {

  return new Promise((resolve) => {
    process.nextTick(() => {
      let result = '';
      if (_linux || _freebsd || _openbsd || _netbsd) {
        let cmd = 'ip route get 1';
        try {
          exec(cmd, { maxBuffer: 1024 * 20000 }, function (error, stdout) {
            if (!error) {
              let lines = stdout.toString().split('\n');
              const line = lines && lines[0] ? lines[0] : '';
              let parts = line.split(' via ');
              if (parts && parts[1]) {
                parts = parts[1].split(' ');
                result = parts[0];
              }
              if (callback) {
                callback(result);
              }
              resolve(result);
            } else {
              if (callback) {
                callback(result);
              }
              resolve(result);
            }
          });
        } catch (e) {
          if (callback) { callback(result); }
          resolve(result);
        }
      }
      if (_darwin) {
        let cmd = 'route -n get default';
        try {
          exec(cmd, { maxBuffer: 1024 * 20000 }, function (error, stdout) {
            if (!error) {
              const lines = stdout.toString().split('\n').map(line => line.trim());
              result = util.getValue(lines, 'gateway');
            }
            if (!result) {
              cmd = 'netstat -rn | awk \'/default/ {print $2}\'';
              exec(cmd, { maxBuffer: 1024 * 20000 }, function (error, stdout) {
                const lines = stdout.toString().split('\n').map(line => line.trim());
                result = lines.find(line => (/^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/.test(line)));
                if (callback) {
                  callback(result);
                }
                resolve(result);
              });
            } else {
              if (callback) {
                callback(result);
              }
              resolve(result);
            }
          });
        } catch (e) {
          if (callback) { callback(result); }
          resolve(result);
        }
      }
      if (_windows) {
        try {
          exec('netstat -r', util.execOptsWin, function (error, stdout) {
            const lines = stdout.toString().split(os.EOL);
            lines.forEach(line => {
              line = line.replace(/\s+/g, ' ').trim();
              if (line.indexOf('0.0.0.0 0.0.0.0') > -1 && !(/[a-zA-Z]/.test(line))) {
                const parts = line.split(' ');
                if (parts.length >= 5 && (parts[parts.length - 3]).indexOf('.') > -1) {
                  result = parts[parts.length - 3];
                }
              }
            });
            if (!result) {
              util.powerShell('Get-CimInstance -ClassName Win32_IP4RouteTable | Where-Object { $_.Destination -eq \'0.0.0.0\' -and $_.Mask -eq \'0.0.0.0\' }')
                .then(data => {
                  let lines = data.toString().split('\r\n');
                  if (lines.length > 1 && !result) {
                    result = util.getValue(lines, 'NextHop');
                    if (callback) {
                      callback(result);
                    }
                    resolve(result);
                    // } else {
                    //   exec('ipconfig', util.execOptsWin, function (error, stdout) {
                    //     let lines = stdout.toString().split('\r\n');
                    //     lines.forEach(function (line) {
                    //       line = line.trim().replace(/\. /g, '');
                    //       line = line.trim().replace(/ +/g, '');
                    //       const parts = line.split(':');
                    //       if ((parts[0].toLowerCase().startsWith('standardgate') || parts[0].toLowerCase().indexOf('gateway') > -1 || parts[0].toLowerCase().indexOf('enlace') > -1) && parts[1]) {
                    //         result = parts[1];
                    //       }
                    //     });
                    //     if (callback) { callback(result); }
                    //     resolve(result);
                    //   });
                  }
                });
            } else {
              if (callback) {
                callback(result);
              }
              resolve(result);
            }
          });
        } catch (e) {
          if (callback) { callback(result); }
          resolve(result);
        }
      }
    });
  });
}

exports.networkGatewayDefault = networkGatewayDefault;
