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Provide a shared function to generate canonical names that statd
uses to index its on-disk monitor list. This function can resolve
DNS hostnames, and IPv4 and IPv6 presentation addresses.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
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Add an API to convert a socket address to a presentation address
string. This is used for displaying error messages and the like.
We prefer getnameinfo(3) over inet_?to?(3) as it supports IPv6 scope
IDs. Since statd has to continue to build correctly on systems whose
glibc does not have getnameinfo(3), an inet_?to?(3) version is also
provided.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
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For the near future, statd will support IPv6 but exportfs will not.
Thus statd will need a version of matchhostname() that can deal
properly with IPv6 remotes. To reduce the risk of breaking exportfs,
introduce a separate version of matchhostname() for statd to use while
exportfs continues to use the existing AF_INET-only implementation.
Note that statd will never send matchhostname() a hostname string
containing export wildcards, so is_hostame() is not needed in the
statd version of matchhostname(). This saves some computational
expense when comparing hostnames.
A separate statd-specific implementation of matchhostname() allows
some flexibility in the long term, as well. We might want to enrich
the matching heuristics of our SM_NOTIFY, for example, or replace
them entirely with a heuristic that is not dependent upon DNS.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
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