Xin LI 5435230b4d Allow underscore in domain names while resolving. While having underscore
is a violation of RFC 1034 [STD 13], it is accepted by certain name servers
as well as other popular operating systems' resolver library.

Bugs are mine.

Obtained from:	ume
MFC after:	2 weeks
2008-02-16 00:16:49 +00:00
..