This bug report is valid. The RFC does not prohibit labels that don't
start with a letter; it merely recommends against them. The definition
of "label" mentioned above is part of a guideline introduced with this
text:
"The following syntax will result in fewer problems with many
applications that use domain names (e.g., mail, TELNET)."
Points in favor of supporting domain names that don't necessarily follow
those guidelines:
1. There are actual domains out on the Internet running web sites with such
domain names (several blogs at blogspot.com spring to mind)
2. Such domains resolve on other OSes (not just Windows, but also OS X).
3. Direct DNS queries (dig, host, nslookup) on Linux work fine with such names.
4. Even gethostbyname() on Linux works for such names when they're in the local
/etc/hosts file. Possibly in NIS maps as well.
Point 4 is especially telling; I don't see any reason for
gethostbyname() to introduce a restriction between two interfaces when
that both operate correctly without the restriction. Especially not a
restriction that prevents access to actual web sites. Telling users
that "The owner of that site shouldn't have named it that" is not
helpful.
** Changed in: glibc (Ubuntu)
Status: Invalid => New
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gethostbyname() cant resolve names starting/ending with "-"
https://bugs.launchpad.net/bugs/144431
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