zapret/common/fwtype.sh
2022-02-15 17:16:23 +03:00

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linux_ipt_avail()
{
exists iptables && exists ip6tables
}
linux_maybe_iptables_fwtype()
{
linux_ipt_avail && FWTYPE=iptables
}
linux_nft_avail()
{
exists nft
}
linux_fwtype()
{
[ -n "$FWTYPE" ] && return
FWTYPE=unsupported
linux_get_subsys
if [ "$SUBSYS" = openwrt ] ; then
# linux kernel is new enough if fw4 is there
if [ -x /sbin/fw4 ] && linux_nft_avail ; then
FWTYPE=nftables
else
linux_maybe_iptables_fwtype
fi
else
SUBSYS=
# generic linux
# flowtable is implemented since kernel 4.16
if linux_nft_avail && linux_min_version 4 16; then
FWTYPE=nftables
else
linux_maybe_iptables_fwtype
fi
fi
export FWTYPE
}
get_fwtype()
{
[ -n "$FWTYPE" ] && return
local UNAME="$(uname)"
case "$UNAME" in
Linux)
linux_fwtype
;;
FreeBSD)
if exists ipfw ; then
FWTYPE=ipfw
else
FWTYPE=unsupported
fi
;;
*)
FWTYPE=unsupported
;;
esac
export FWTYPE
}