specify device for advertisement and browsing

[defunctzombie]

Is there a way to specify which network device mdns should advertise on and/or browse? I have multiple virtual devices and would like to use a specific one.

[agnat]

Yes, you can specify an interface index. See http://agnat.github.com/node_mdns/user_guide.html#advertisement

[defunctzombie]

Gotcha. Is there a way to get a map of these interfaces so I know which index is what interface?

[agnat]

Well, since node v0.5.1 there is os.networkInterfaces()

http://nodejs.org/docs/latest/api/os.html#os_os_networkinterfaces

I haven't tried it yet, but I'd do something like this:

var index = Object.keys(os.networkInterfces()).indexOf('en0') + 1;

[defunctzombie]

yea, I guess I was looking for clarification on if those two arrays would be in the same order. so that item 0 in os.networkInterfaces => 1 for mdns and so on.

[agnat]

Hm, looking at the libuv sources, I doubt that it will work correctly. libuv omits interfaces that have no address assigned, possibly messing up the index values.

I'll probably file an issue with the node/libuv guys.

[defunctzombie]

Is the index something the underlying mdns sys libraries accept as a parameter? Do they not accept any sort of string or return a list of valid index <-> string maps? If they do it would be simple enough to make a js wrapping for accepting the interface string and converting that to a valid index.

[agnat]

On 18.05.2012, at 17:23, Roman Shtylman wrote:

Is the index something the underlying mdns sys libraries accept as a parameter?

Yes.

Do they not accept any sort of string

Yes. (No, they don't accept strings)

or return a list of valid index <-> string maps?

No.

If they do it would be simple enough to make a js wrapping for accepting the interface string and converting that to a valid index.

Yes. If such an API existed I would have wrapped it a long time ago … ;-)

I just hesitated to add highly platform specific code which doesn't really belong here. However, now that node has os.networkInterfaces() it's just a matter of nudging their API a little (by adding an exhaustive flag for example).

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#31 (comment)

[agnat]

Hey @shtylman.

Just wanted to let you know that there is finally some progress on this one. See #42 for details.

Cheers.