No, Mac OS X's firewall is in stealth mode by default.... if the
packet can't get through you'll never know about it, and it's a great
security feature..
Auto Discovery classes are based on UDP, so they're out. I'd say the
best way to do this would be to use a common port number, such as 80
(web) and have a PHP/ASP/JS/whatever based authentication system,
running at your end.
Of course this relies on them having an internet connection, but 90%+
of people are always on these days, just make sure you're letting them
(the end user) know what you're doing, and encrypt the information
being sent back and forth.
For LAN users, if you get two registrations form the same IP, then two
people on the same LAN are trying to use your app. If they have a site
license, it's cool, if not, kill the second instance.
I much prefer to simply trust my customers these days, the genuine
one's appreciate it and come back for more, the one's who pirate it
were never going to buy it in the first place, so no business lost as
far as I am concerned.
- Tom.
On 31/12/2007, at 7:31 AM, Peter Truskier wrote:
> I'd like to hear folks' thoughts about network "sniffing" strategies
> for licensing/serial number enforcement. I will say that I'm not wild
> about this approach in the first place, but a client has asked for it.
>
> I have code that uses UDP sockets to multicast queries at critical
> points in execution to see if other copies of the application with
> the same serial number are running on the LAN, and if so whether the
> total number exceeds the license limitations.
>
> The problem with this strategy is that firewalls can easily be set up
> to block UDP connections. It seems that if a UDP socket is blocked on
> Windows, I get an error 107 when I try to multicast. On Mac OS X,
> however, when the "Block UDP Traffic" option is selected in the
> firewall's "Advanced" section, the socket gets no error, but just
> acts as though the multicast went out, or perhaps it's the return
> message that's blocked silently. In any case, I don't seem to be able
> to detect the block on Mac OS X.
>
> Thanks,
>
> Peter
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