[Bug network/25163] New: Allow DNS stub resolver configuration for current search list practices

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25163

            Bug ID: 25163
           Summary: Allow DNS stub resolver configuration for current
                    search list practices
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

There is a set of ICANN recommendations for search list processing:

https://www.icann.org/en/groups/ssac/documents/sac-064-en.pdf

I do not think this is something that can be currently configured in
/etc/resolv.conf. Eventually, we should also change the default, but the
immediate goal is to provide configuration options to follow the
recommendations if the system administrator desires that.

Defaulting the search list from the host name is also something that will need
fixing. Currently, there does not seem to be a good way to disable the search
list completely and also prevent dotless queries from reaching the root name
servers.

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