libnftables: refuse to open onput files other than named pipes or regular files

Don't start e.g. parsing a block device.
nftables is typically run as privileged user, exit early if we
get unexpected input.

Only exception: Allow character device if input is /dev/stdin.

Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1664
Signed-off-by: Florian Westphal <fw@strlen.de>

0 files changed, 0 insertions, 0 deletions