On Feb 18, 2008, at 6:38 AM, Guy Helmer wrote:
Xin LI wrote:
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M. Warner Losh wrote:
I don't think it would be the end of world if we allow _ in host
names.
All other (lame) OSes allows it, their resolver just accepts this
character and give the answer, actually, I would be very surprised
if it
can still cause any real world attack nowadays.
Are we talking about hostnames specifically, or domain name
components in general?
I've been recently looking at DomainKeys, and underscores appear to
be typically used in the domain components for domain keys TXT
records (example below from http://www.elandsys.com/resources/sendmail/domainkeys.html)
:
mail._domainkey.example.com. IN TXT "k=rsa; t=y;
p=MEwwPQRJKoZIhvcNADAQCQADOwAwOAIxANPpYHdE2tevfEpvL1Tk2dDYv0pF28/
f5MxU83x/0b
sn4R4p7waPaz1IbOGs/6bm5QIDAQAB"
Other systems, including mDNS and zeroconf, rely on underscores in
domain components as well. Underscores in domain names are a de jure
standard, in the hostname a de facto standard.
--
Where am I, and what am I doing in this handbasket?
Wes Peters [EMAIL PROTECTED]
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