Greetings,
Xin LI wrote:
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JINMEI Tatuya / 神明達哉 wrote:
[snip]
At the beginning I was confused with host(1) and resolver library, they
are different problems, sorry for the confusion.
I think Hajimu-san's analysis was correct that it was caused by the
check in resolver, here is a ktrace output from a system without patched
libc:
http://www.delphij.net/kdump.txt
Note that, with a patched (with ume@'s patch) resolver, the program
*does* worked as expected, also this will make firefox to be able to
resolve the domain name.
Test program can be downloaded from http://www.delphij.net/test.c .
With patched libc you will get no output (expected), and with unpatched
libc you will get "Unknown server error" and will be unable to get the A RR.
It turns out that the baidu.com DNS administrator might be unaware of
the potential violation of RFC 952 "ASSUMPTIONS" and RFC 1034 Section
3.5. However, I am afraid that there are some DNS server
implementations that does allow '_'s in domain names, so if there is no
potential risks allowing it from the resolver side I think it might be a
good idea to be more permissive for this case, because there are real
uses of it, and other operating systems does allow it at the client side.
Did you check http://tools.ietf.org/html/rfc2782 ?
It is "PROPOSED STANDARD" and MS DNS in Win2003 already uses it (if you
have domain controller for example).
--
Best Wishes,
Stefan Lambrev
ICQ# 24134177
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