Fixes #725. @simonmichal - please test.
If the user provides a non-FQDN (such as `xrootd` instead of `xrootd.cern.ch`), this will detect the situation and use `getaddrinfo` to expand to the canonical name.
Note that the canonical name may be somewhat unexpected as it resolves CNAMEs all the way down to an A record. For example, if you set your search domain to `unl.edu`, then the canonical name for `www` is not `www.unl.edu` but rather `unlcms-rs.autosplit.its-sys.unl.edu`.
This also allows the environment variable `XrdSecGSITrustDNS` to be set to 0; if it is, all DNS lookups are skipped.
You can view, comment on, or merge this pull request online at:
https://github.com/xrootd/xrootd/pull/731
-- Commit Summary --
* Expand the hostname if necessary.
* Allow XrdSecGSITrustDNS setting to disable use of all DNS lookups.
-- File Changes --
M src/XrdSecgsi/XrdSecProtocolgsi.cc (45)
-- Patch Links --
https://github.com/xrootd/xrootd/pull/731.patch
https://github.com/xrootd/xrootd/pull/731.diff
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