[vdr] [Patch] Allow to limit SVDRP port to given IP

Martin Emrich emme at emmes-world.de
Fri Jan 8 20:44:50 CET 2010


Hi!

Klaus Schmidinger schrieb:

> How about this: if svdrphosts.conf contains only one single IP number, then
> open the port for only that IP number. Otherwise i needs to be opened generally,
> anyway.

AFAIK one can only bind an IP socket to a local address (usually
corresponding to a network interface, e.g. 127.0.0.1) or 0.0.0.0, so if
I want to accept SVDRP _from_ a specific address via eth0, I have to
bind to the address configured on eth0.

As I get the peer address via accept(), I can directly determine if I
want to "risk" talking to (or even reading from) it, I assume VDR does
exactly this by looking up the address in svdrphosts.conf.

IMHO: If there is a vulnerability that is effective when one only calls
accept(), this is a problem of the OS (Kernel/libc). If one is really
paranoid, there's always netfilter.

Ciao

Martin



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