[Bug 40247] Wine returns bad MAC address for loopback interface, fails to run licensed programs.

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=40247

--- Comment #4 from alexchandel at gmail.com ---
I did some tracing, and it's as I feared.

The program calls Netbios() with ncb_command=0x37 and ncb_lana_num=0, then with
ncb_command=0x32 and ncb_lana_num=0, then with ncb_command=0x33 and
ncb_lana_num=0. This eventually calls GetIfEntry(), which calls
getInterfaceEntryByName(), which calls getInterfacePhysicalByName(), which (on
my machine) calls sysctl().

sysctl returns an empty MAC address for the loopback interface, and Wine zeros
out the rest of it (i.e. all 12 bytes).

No windows program will ever expect the first enumerated network adapter to be
the loopback interface, and some old ones are hard-coded to require that the
MAC address of the first adapter be known to the program's author.

Either the loopback interface should be skipped during enumeration, or Wine
should return a default MAC address instead of a zeroed MAC address.

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