[Serdev] Can the function is_to_local be added to the domain module

[Zeus Ng]

In an effort to prevent third party from using our sip proxy as a open
relay, I'm try to use the following logic for tight control.

If (!(is_from_local() || is_uri_host_local())) {
	xlog("L_ERR", "Relay access denied");
	sl_send_reply("404", "Relay access not allowed here");
	break;
};

However, I think this is not a reliable checking method as R-URI can be
changed along the way from proxy to proxy. Is it possible to introduce the
is_to_local() function much like the is_from_local() in the domain module.
As far as I understand, the "To" header should not be changed even after
passing a proxy. So, checking it for relay access is much better than
checking R-URI.

Your comment is welcome.


Zeus Ng

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