does not return all ARP entries

[DouglasPearless]

Sample code:

var arp = require('arp-a')
, tbl = { ipaddrs: {}, ifnames : {} }
;

arp.table(function(err, entry) {
if (!!err) return console.log('arp: ' + err.message);
if (!entry) return;

tbl.ipaddrs[entry.ip] = entry.mac;
if (!tbl.ifnames[entry.ifname]) tbl.ifnames[entry.ifname] = {};
tbl.ifnames[entry.ifname][entry.mac] = entry.ip;

});

console.log(tbl)

Output from the code:

{ ipaddrs: 
   { '169.254.41.79': '70:73:cb:b1:d7:20',
     '172.22.1.1': 'f8:c0:01:85:95:01',
     '172.22.1.21': '70:73:cb:b1:d7:20',
     '172.22.1.24': 'e0:f8:47:2d:78:38',
     '172.22.1.32': 'c8:e0:eb:26:dc:55',
     '172.22.1.33': '5c:cf:7f:44:a5:9a',
     '172.22.1.35': '80:be:05:86:8e:d3',
     '172.22.1.40': '00:25:4b:b7:71:d8',
     '172.22.1.41': '70:3e:ac:68:14:9d',
     '172.22.1.43': 'b0:34:95:f1:8d:40',
     '172.22.1.255': 'ff:ff:ff:ff:ff:ff',
     '224.0.0.1': '01:00:5e:00:00:01',
     '224.0.0.251': '01:00:5e:00:00:fb',
     '239.255.255.250': '01:00:5e:7f:ff:fa' },
  ifnames: 
   { en1: 
      { '70:73:cb:b1:d7:20': '172.22.1.21',
        'f8:c0:01:85:95:01': '172.22.1.1',
        'c8:e0:eb:26:dc:55': '172.22.1.32',
        '5c:cf:7f:44:a5:9a': '172.22.1.33',
        '80:be:05:86:8e:d3': '172.22.1.35',
        '00:25:4b:b7:71:d8': '172.22.1.40',
        '70:3e:ac:68:14:9d': '172.22.1.41',
        'b0:34:95:f1:8d:40': '172.22.1.43',
        'ff:ff:ff:ff:ff:ff': '172.22.1.255',
        '01:00:5e:00:00:01': '224.0.0.1',
        '01:00:5e:00:00:fb': '224.0.0.251',
        '01:00:5e:7f:ff:fa': '239.255.255.250' },
     lo0: { 'e0:f8:47:2d:78:38': '172.22.1.24' } } }

Comparative output from AngryIP:

172.22.1.18 | 1 ms | NAS.local | [n/s] | ICP | 00:08:9B:D0:25:4E
-- | -- | -- | -- | -- | --
172.22.1.19 | 1 ms | [n/a] | [n/s] | Hewlett Packard | 00:1F:29:67:4C:F8
172.22.1.21 | 1 ms | A | [n/s] | Apple | 70:73:CB:B1:D7:20
172.22.1.22 | 1 ms | B | [n/s] | Apple | B8:C7:5D:C7:A7:0C
172.22.1.23 | 1 ms | C | [n/s] | PC Partner | 00:01:2E:48:AB:AA
172.22.1.24 | 0 ms | D | [n/s] | Apple | E0:F8:47:2D:78:38
172.22.1.26 | 1 ms | E | [n/s] | Apple | 5C:96:9D:6D:4F:AF
172.22.1.27 | 1 ms | F | [n/s] | CANON | 88:87:17:A0:50:06
172.22.1.29 | 24 ms | G | [n/s] | Apple | 6C:8D:C1:9F:B0:D1
172.22.1.30 | 1 ms | H | [n/s] | Raspberry Pi Foundation | B8:27:EB:47:F7:49
172.22.1.32 | 90 ms | I | [n/s] | Apple | C8:E0:EB:26:DC:55
172.22.1.33 | 5 ms | [n/a] | [n/s] | Espressif | 5C:CF:7F:44:A5:9A
172.22.1.34 | 107 ms | [n/a] | [n/s] | Espressif | 5C:CF:7F:89:23:F7
172.22.1.35 | 1015 ms | J | [n/s] | Apple | 80:BE:05:86:8E:D3
172.22.1.37 | 5 ms | [n/a] | [n/s] | Frontier Silicon | 00:22:61:B0:EB:9E
172.22.1.38 | 78 ms | K | .local[n/s] | Apple | 00:25:4B:94:18:14
172.22.1.40 | 1 ms | L | .local[n/s] | Apple | 00:25:4B:B7:71:D8
172.22.1.43 | 2 ms | M | [n/s] | Apple | B0:34:95:F1:8D:40

So it appears to ignore entries without a host name?

[mrose17]

try moving the console.log(tbl) to the second line of the callback, i.e.,

    if (!entry) return console.log(tbl);

does that help?