Allow underscores in DNS names

[Dan Nelson]

In the last episode (Mar 29), Dag-Erling Smorgrav said:
> The attached patch, inspired by a discussion on -STABLE, modifies our
> resolver library to allow underscores in host names, by classifying
> the underscore as a hyphen character.  Even though RFC952 forbids
> them, underscores are becoming increasingly common in DNS, and they
> are sometimes used for mechanisms (such as Microsoft's automatic proxy
> configuration scheme) which we might want to support in FreeBSD.

I thought proxy autodetect used wpad.domainname.com or looked up
http://domainname.com/wpad.dat ?  All the XP machines here do that.

-- 
	Dan Nelson
	dnelson at allantgroup.com