[lug] Bletcherous pipe, FIXME!

[Jeffrey Haemer]

Andrew

I'd find something like this is at least easier to maintain.  YMMV.

{
  printf "ALL: localhost"
  route -n | egrep -v '^(0|169|[A-Z])' |               # grab the
local hosts/masks
  while read dest gateway genmask etc; do
    printf ", $dest/$gateway"                             # turn into
comma-separated list
  done
  echo                                                             #
newline on the end
} >> /etc/hosts.allow                                       # tack
onto the hosts.allow file


On Thu, Apr 2, 2009 at 12:55 PM, Andrew Gilmore <agilmore at skybeam.com> wrote:
>
> I discovered this nastiness in something I recommended in a benchmark, and before I got it published, thought I'd see if anyone cared to try to fix it...
>
> The goal is to generate a sane default hosts.allow tcp wrappers only allowing hosts on the local networks.
>
> printf "ALL: localhost" >> /etc/hosts.allow
> for I in `route -n |tail -n +3 |sed -e 's/ */ /g'| cut -f1,3 -d ' '
>   --output-delimiter=/ | grep -vE "^(0|169)" |sort -n`; do
>   printf ", $I" >> /etc/hosts.allow;
> done
> echo >> /etc/hosts.allow
>
> Ouch, I know.
>
> Anyone for a game of bash golf? :-)
>
> Andrew
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Jeffrey Haemer <jeffrey.haemer at gmail.com>
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