[Bug network/18557] New: ruserok has bad scalability with large ~/.rhosts file.

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

https://sourceware.org/bugzilla/show_bug.cgi?id=18557

            Bug ID: 18557
           Summary: ruserok has bad scalability with large ~/.rhosts file.
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: carlos at redhat dot com
  Target Milestone: ---

With a very large ~/.rhosts file the number of DNS queries per entry causes
scalability issues. It can take minutes to login if you have a very very large
~/.rhosts file.

As an optimization the ruserok and related API functions could short-circuit
check if the user matched and move on to the next line if possible. This goes a
long way to helping certain use cases.

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