Simple arp-scan wrapper module.

arp-scan sends ARP (Address Resolution Protocol) queries to the specified targets, and displays any responses that are received. It allows any part of the outgoing ARP packets to be changed, allowing the behavior of targets to non-standard ARP packets to be examined. The IP address and hardware address of received packets are displayed, together with the vendor details. These details are obtained from the IEEE OUI and IAB listings, plus a few manual entries. It includes arp-fingerprint, which allows a system to be fingerprinted based on how it responds to non-standard ARP packets.

Tested in Mac OSX 10.9.5 and Raspbian GNU/Linux 7 (wheezy).

First you need to install arp-scan if is not already installed.

On Debian:

sudo apt-get install arp-scan

In macOS it will use arp.

Install the module with: npm install arpscan

If you get this error when running this module, you might have to sudo the command:

pcap_lookupdev: no suitable device found

Usage: arpscan [options]

Options:

  -h, --help                   output usage information
  -V, --version                output the version number
  -C, --check-arpscan          Test to see if arp-scan is installed
  -i, --interface [interface]  Interface to scan
  -v, --verbose                Verbose mode

To use the module from your program:

const arpScanner = require('arpscan');

arpScanner(onResult, options);

function onResult(err, data){
    if(err) throw err;
    console.log(data);
}

To use the module from your program with promises:

var arpScanner = require('arpscan/promise');

arpScanner(options)
    .then(onResult)
    .catch(onError);

function onResult(data) {
    console.log(data);
}

function onError(err) {
    throw err;
}

The output should be something similar to:

[ { ip: '192.168.1.1',
    mac: 'AC:CF:23:31:9B:FC',
    vendor: 'Cisco-Linksys, LLC',
    timestamp: 1427686747854 },
  { ip: '192.168.1.132',
    mac: 'AC:CF:23:3F:9B:33',
    vendor: 'Raspberry Pi Foundation',
    timestamp: 1427686747854 },
  { ip: '192.168.1.140',
    mac: 'b8:e9:37:11:d5:5c',
    vendor: 'Sonos, Inc.',
    timestamp: 1427686747854 },
  { ip: '192.168.1.143',
    mac: '00:19:93:68:65:53',
    vendor: 'Apple',
    timestamp: 1427686747854 },
  { ip: '192.168.1.148',
    mac: 'AC:FC:23:3F:9B:23',
    vendor: 'Hi-flying electronics technology Co.,Ltd (DUP: 2)',
    timestamp: 1427686747854 } ]

The module also provides a cli interface:

$ arpscan

If arpscan fails, try to run the command manually:

$ arp-scan -l

You might get an error similar to this:

WARNING: Could not obtain IP address for interface fw0. Using 0.0.0.0 for the source address, which is probably not what you want. Either configure fw0 with an IP address, or manually specify the address with the --arpspa option. Interface: fw0, datalink type: APPLE_IP_OVER_IEEE1394 (Apple IP-over-IEEE 1394) WARNING: Unsupported datalink type ERROR: Could not obtain interface IP address and netmask ERROR: pcap_lookupnet: fw0: no IPv4 address assigned

You might want to specify which interface to use:

$ arp-scan -interface en0 --localnet

• Parse signature metadata
• Handle arp-scan not available in machine!

890 packets received by filter, 0 packets dropped by kernel Ending arp-scan 1.9: 256 hosts scanned in 1.861 seconds (137.56 hosts/sec). 7 responded

• Version: 0.3.0 2016-11-11 Added interface option
• Version: 0.2.0 2016-11-10 Added Promise API
• Version: 0.0.2 2015-03-29
• Version: 0.0.1 2015-03-29

Copyright (c) 2015 goliatone
Licensed under the MIT license.

MAC os output:

Interface: en0, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.9 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/)
192.168.1.1 48:f8:b3:1b:57:84   Cisco-Linksys, LLC
192.168.1.143   e8:8d:28:19:68:47   Apple (DUP: 1)
192.168.1.132   b8:27:eb:81:56:02   Raspberry Pi Foundation (DUP: 1)
192.168.1.140   b8:e9:37:11:d5:5c   Sonos, Inc. (DUP: 1)
192.168.1.125   f0:08:f1:5e:65:10   Samsung Electronics Co.,Ltd (DUP: 1)
192.168.1.132   b8:27:eb:81:56:02   Raspberry Pi Foundation (DUP: 2)
192.168.1.140   b8:e9:37:11:d5:5c   Sonos, Inc. (DUP: 2)

890 packets received by filter, 0 packets dropped by kernel
Ending arp-scan 1.9: 256 hosts scanned in 1.861 seconds (137.56 hosts/sec). 7 responded

Raspberry Pi B output:

Interface: eth0, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.8.1 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/)
192.168.1.125   f0:08:f1:5e:65:10   (Unknown)
192.168.1.140   b8:e9:37:11:d5:5c   (Unknown)
192.168.1.143   e8:8d:28:19:68:47   (Unknown)
192.168.1.145   78:31:c1:b8:05:12   (Unknown)
192.168.1.146   00:19:9d:68:65:52   VIZIO, Inc.
192.168.1.131   b8:e9:37:5c:0f:c0   (Unknown)
192.168.1.138   b8:e9:37:5c:10:36   (Unknown)
192.168.1.148   ac:cf:23:3f:9b:fc   (Unknown)
192.168.1.1 48:f8:b3:1b:57:84   (Unknown)
192.168.1.144   ac:cf:23:39:bb:c2   (Unknown)

11 packets received by filter, 0 packets dropped by kernel
Ending arp-scan 1.8.1: 256 hosts scanned in 4.393 seconds (58.27 hosts/sec). 10 responded