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node.jselectron

Electron client IP

I'm using the following code to retrieve the client IP in my electron application:

const fnOSIP = () => {
    const nets = networkInterfaces();
    const results = Object.create(null); // or just '{}', an empty object   

    for (const name of Object.keys(nets)) {
        for (const net of nets[name]) {
            // skip over non-ipv4 and internal (i.e. 127.0.0.1) addresses
            if (net.family === 'IPv4' && !net.internal) {
                if (!results[name]) {
                    results[name] = [];
                }

                results[name].push(net.address);
            }
        }
    }
    return results; 
}

The problem is that it's returning two IP's. I would like to get the primary but not quite sure.

enter image description here

If I do a command: ip address I can get the following information of each IP:

 3: wlp0s20f3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
 link/ether 08:d2:3e:a5:46:37 brd ff:ff:ff:ff:ff:ff
 inet 192.168.0.117/24 brd 192.168.0.255 scope global dynamic noprefixroute wlp0s20f3
    valid_lft 4944sec preferred_lft 4944sec
 inet6 fe80::7701:3d92:db95:9fdc/64 scope link noprefixroute 
    valid_lft forever preferred_lft forever

 16: br-f5f2e5a5a382: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
     link/ether 02:42:23:09:cb:c9 brd ff:ff:ff:ff:ff:ff
     inet 172.19.0.1/16 brd 172.19.255.255 scope global br-f5f2e5a5a382
        valid_lft forever preferred_lft forever
     inet6 fe80::42:23ff:fe09:cbc9/64 scope link 
        valid_lft forever preferred_lft forever

The br-f5f2... is from docker:

Would it make sense to assume that if it has /24 it's the primary?

Solution

  • The Problem is, you have to strip the internal Addresses. I use this script to terieve the IP of a Client:

    function getIPs() {
    var ifaces = os.networkInterfaces();
    let ipAdresse = {};
    Object.keys(ifaces).forEach(function (ifname) {
      let alias = 0;
      ifaces[ifname].forEach(function (iface) {
      if ('IPv4' !== iface.family || iface.internal !== false) {
        // skip over internal (i.e. 127.0.0.1) and non-ipv4 addresses
      return;
    }

    if (alias >= 1) {
    // this single interface has multiple ipv4 addresses
    console.log(ifname + ':' + alias, iface.address);
    } else {
    // this interface has only one ipv4 adress
    console.log(ifname, iface.address);
    ipAdresse = {IP: iface.address, MAC: iface.mac};
    }
    ++alias;
  });
});
return ipAdresse;
}

    The Problem (and I could not find a solution for that) is, if the machine has two interfaces (like LAN and WIFI enabled at the same time) you cannot determine which is which.