Resolve issue with default broadcast addresses

[my2b]

Use list of network interfaces in order to find broadcast addresses for each interface and use them instead 255.255.255.255 because of issues on Windows: see thread How to fix the global broadcast address (255.255.255.255) behavior on Windows?

[wankdanker]

Hey @my2b. Thank you for your contribution. This looks pretty good.

The only difference that I would like to see is to only execute the block of code that determines the broadcast addresses by interface when broadcast is not specified. Like:

if (self.broadcast) {
    self.destination = self.broadcast
}
else {
          /**
             * Get broadcast addresses for all network interfaces instead 255.255.255.255
             * because of issues with broadcast using this method on Windows
             */
            var networkInterfaces = os.networkInterfaces(),
                broadcastAddresses = [];

            Object.keys(networkInterfaces).forEach(function (ifname) {
                networkInterfaces[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;
                    }

                    var tabytes = (iface.address).split("."),
                        tsbytes = (iface.netmask).split(".");

                    // Calculate Broadcast address
                    var tbaddr = ((tabytes[0] & tsbytes[0]) | (255 ^ tsbytes[0])) + "."
                        + ((tabytes[1] & tsbytes[1]) | (255 ^ tsbytes[1])) + "."
                        + ((tabytes[2] & tsbytes[2]) | (255 ^ tsbytes[2])) + "."
                        + ((tabytes[3] & tsbytes[3]) | (255 ^ tsbytes[3]));

                    broadcastAddresses.push(tbaddr);
                });
            });

            self.destination = broadcastAddresses;
}

That way if for some odd reason os.networkInterfaces() doesn't work well across platforms it won't be executed at all if broadcast is manually specified.

What do you think about that?

[my2b]

Thanks for fast answer! I absolutely agree with your additional changes, in my opinion this is a good way how to protect your code and I like it.

If there is nothing else to change/add - in which way can we add this changes? I am new in GitHub so let me know please how can I contribute new changes: I need to create another pull request or change this one somehow or you may do it by yourself?

Thanks!

[wankdanker]

Hi @my2b! Just make the changes in your local git repo, commit them and then push them to your master branch on github. That will update this pull request. No need for a separate pull request. Once this pull request is looking good, I'll merge it and we'll close it up!

Thank you for your contribution.

Dan

[my2b]

Done, @wankdanker Thank you!