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Commit 8ce130c4 switched in the new statd_canonical_name() function
that constructs a "unique" name statd can use to uniquely identify a
monitor record.
The legacy statd would monitor a client that sent an IP address with
no reverse map as its caller_name. To remain bug-for-bug compatible,
allow this case in the new statd.
This shouldn't be a problem: statd_canonical_name() needs to create
a unique name for the monitored host so it can keep track of monitor
requests from the same remote. The IP address itself should work as
well as the host's canonical name, in case there is no reverse
mapping.
We still enforce the requirement that a mon_name that is a DNS name
must have a forward map to an IP address.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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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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