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resolv.conf search parsing has artificial limit
Summary
libirs support only 8 search domains
BIND version used
master branch
Steps to reproduce
- sed -i 's/^search .*/search non-existent1.very-long-domain.fedoraproject.org non-existent2.very-long-domain.fedoraproject.org non-existent3.very-long-domain.fedoraproject.org non-existent4.very-long-domain.fedoraproject.org non-existent5.very-long-domain.fedoraproject.org non-existent6.very-long-domain.fedoraproject.org openstacklocal redhat.com/' /etc/resolv.conf
- [ "$(host access)" == "$(getent host access.redhat.com.)" ] && echo matches
- sed -i 's/^search .*/search non-existent1.very-long-domain.fedoraproject.org non-existent2.very-long-domain.fedoraproject.org non-existent3.very-long-domain.fedoraproject.org non-existent4.very-long-domain.fedoraproject.org non-existent5.very-long-domain.fedoraproject.org non-existent6.very-long-domain.fedoraproject.org non-existent7.very-long-domain.fedoraproject.org non-existent8.very-long-domain.fedoraproject.org openstacklocal redhat.com/' /etc/resolv.conf
- [ "$(host access)" == "$(getent host access.redhat.com.)" ] && echo still matches
What is the current bug behavior?
- does not match
What is the expected correct behavior?
- does match
Relevant configuration files
# resolv.conf
search non-existent1.very-long-domain.fedoraproject.org non-existent2.very-long-domain.fedoraproject.org non-existent3.very-long-domain.fedoraproject.org non-existent4.very-long-domain.fedoraproject.org non-existent5.very-long-domain.fedoraproject.org non-existent6.very-long-domain.fedoraproject.org non-existent7.very-long-domain.fedoraproject.org non-existent8.very-long-domain.fedoraproject.org openstacklocal redhat.com
nameserver 9.9.9.9Relevant logs and/or screenshots
(none.)
Possible fixes
I know using such high number domains would cause too many queries to resolve. I know it is a bad idea. But I think there should not be such hard limit preventing this. It was updated in glibc to accept unlimited domains. It is not good idea, but I think it is better than simply ignoring what user wishes. We have some customers hitting limits on it.
I think it should be discouraged but possible.