>I have basically two sets of issues: one is what the syntax of
>resolv.conf should be (and what extensions in it I should understand);
>the other is what the resolver behaviour should be in various
>circumstances.
about resolv.conf syntax: the easiest way is to have "nameserver
<ipv6 address>". BIND4/8 resolver code (res_init.c) simply ignore
unparsable lines, as well as unparsable address portion in
"nameserver foo" line. so this should be safe to put
"nameserver <v6addr>" line into resolv.conf, even if old binary may
look at the file.
about behavior: there are various APIs visible to the userland
programmers. I think you may want to honor API definition in RFCs
and X/Open documents, and behave as necessary. for example:
- gethostbyname() - IPv4 only -> A query
- gethostbyname2(AF_INET) - if af == AF_INET, IPv4 only -> A query
- gethostbyname2(AF_INET6) - see RFC2133
- getipnodebyname(AF_INET) - see RFC2553, IPv4 only -> A query
- getipnodebyname(AF_INET6) - see RFC2553
(not sure if the answer is relevant for your library suite)
itojun
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