[Bug libc/2099] Support for SRV records in getaddrinfo

["quentusrex at gmail dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=2099

--- Comment #6 from William King <quentusrex at gmail dot com> 2011-01-09 23:10:30 UTC ---
More specifically: 

Given than applications that use getaddrinfo() pass in a host name, (sometimes)
a service name, also struct addrinfo *hints, plus the response struct addrinfo
**res. Usually after checking for an error pass the res structure directly into
the connect() function. The current advantage is that the application does not
have to deal with ipv4 or ipv6 differences(unless it wants to restrict to only
one of the two). 

In the file sysdeps/posix/getaddrinfo.c and a few lines into the function
gaih_inet() right after the protocol and socket type are checked, I propose
adding a check to see "if(service != NULL && (req->ai_flags & GAI_SRV_ENABLE))
{ /* handle SRV lookups */}"

This way if the SRV lookup does return a list of addresses then getaddrinfo()
will return the SRV records, in the order they should be used, but if the SRV
lookup does not return any useful records, then getaddrinfo() will fall back to
the standard lookups below. 

Thoughts?

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