Re: Determining if a connection is local

[<uni...@sh...>]

Alan Cox wrote:

>On Iau, 2004-10-21 at 16:49, Thomas Hellstr=C3=B6m wrote:
> =20
>
>>architecture-independent library should be able to determine whether th=
e
>>connection is local or not. Any hints on how to do best do this without
>>using drm?
>>   =20
>>
>
>Try DRM first and see if it fails.
>
>There really isn't much else you can do - "local" connections to X
>include ssh forwarding and proxies 8(
>
> =20
>
The problem is (hypothetical) if I try DRM on a remote machine with the=20
same
architecture it won't fail until the server tries to authenticate the=20
connection using
drmauthmagic(). Even then, it might not fail, but instead authenticate a=20
totally unrelated
local connection on the server machine. (I'm not sure how well=20
drmauthmagic really checks the
magic number and the related connection.)


One solution could be to create a shared memory page and put in a random=20
"magic" number in the first few bytes, and see if the server is able to=20
read and report back the same number. That would take care also of the=20
ssh and proxy cases.

/Thomas