# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

PYTHON_COMPAT=( python3_{7,8,9} )

inherit autotools linux-info python-r1 systemd

DESCRIPTION="Linux kernel (3.13+) firewall, NAT and packet mangling tools"
HOMEPAGE="https://netfilter.org/projects/nftables/"
SRC_URI="https://netfilter.org/projects/nftables/files/${P}.tar.bz2"

LICENSE="GPL-2"
SLOT="0"
KEYWORDS="~amd64 ~arm ~arm64 ~ia64 ~ppc64 ~sparc ~x86"
IUSE="debug doc +gmp json +modern-kernel python +readline static-libs xtables"

RDEPEND="
	>=net-libs/libmnl-1.0.4:0=
	>=net-libs/libnftnl-1.1.9:0=
	gmp? ( dev-libs/gmp:0= )
	json? ( dev-libs/jansson )
	python? ( ${PYTHON_DEPS} )
	readline? ( sys-libs/readline:0= )
	xtables? ( >=net-firewall/iptables-1.6.1 )
"

DEPEND="${RDEPEND}"

BDEPEND="
	doc? (
		app-text/asciidoc
		>=app-text/docbook2X-0.8.8-r4
	)
	virtual/pkgconfig
"

REQUIRED_USE="
	python? ( ${PYTHON_REQUIRED_USE} )
"

PATCHES=(
	"${FILESDIR}/${PN}-0.9.8-slibtool.patch"
)

python_make() {
	emake \
		-C py \
		abs_builddir="${S}" \
		DESTDIR="${D}" \
		PYTHON_BIN="${PYTHON}" \
		"${@}"
}

pkg_setup() {
	if kernel_is ge 3 13; then
		if use modern-kernel && kernel_is lt 3 18; then
			eerror "The modern-kernel USE flag requires kernel version 3.18 or newer to work properly."
		fi
		CONFIG_CHECK="~NF_TABLES"
		linux-info_pkg_setup
	else
		eerror "This package requires kernel version 3.13 or newer to work properly."
	fi
}

src_prepare() {
	default

	# fix installation path for doc stuff
	sed '/^pkgsysconfdir/s@${sysconfdir}.*$@${docdir}/skels@' \
		-i files/nftables/Makefile.am || die
	sed '/^pkgsysconfdir/s@${sysconfdir}.*$@${docdir}/skels/osf@' \
		-i files/osf/Makefile.am || die

	eautoreconf
}

src_configure() {
	local myeconfargs=(
		# We handle python separately
		--disable-python
		--sbindir="${EPREFIX}"/sbin
		$(use_enable debug)
		$(use_enable doc man-doc)
		$(use_with !gmp mini_gmp)
		$(use_with json)
		$(use_with readline cli readline)
		$(use_enable static-libs static)
		$(use_with xtables)
	)
	econf "${myeconfargs[@]}"
}

src_compile() {
	default

	if use python; then
		python_foreach_impl python_make
	fi
}

src_install() {
	default

	if ! use doc; then
		pushd doc >/dev/null || die
		doman *.?
		popd >/dev/null || die
	fi

	local mksuffix="$(usex modern-kernel '-mk' '')"

	exeinto /usr/libexec/${PN}
	newexe "${FILESDIR}"/libexec/${PN}${mksuffix}.sh ${PN}.sh
	newconfd "${FILESDIR}"/${PN}${mksuffix}.confd ${PN}
	newinitd "${FILESDIR}"/${PN}${mksuffix}.init-r1 ${PN}
	keepdir /var/lib/nftables

	systemd_dounit "${FILESDIR}"/systemd/${PN}-restore.service

	if use python ; then
		python_foreach_impl python_make install
		python_foreach_impl python_optimize
	fi

	find "${ED}" -type f -name "*.la" -delete || die
}

pkg_postinst() {
	local save_file
	save_file="${EROOT}/var/lib/nftables/rules-save"

	# In order for the nftables-restore systemd service to start
	# the save_file must exist.
	if [[ ! -f "${save_file}" ]]; then
		( umask 177; touch "${save_file}" )
	elif [[ $(( "$( stat --printf '%05a' "${save_file}" )" & 07177 )) -ne 0 ]]; then
		ewarn "Your system has dangerous permissions for ${save_file}"
		ewarn "It is probably affected by bug #691326."
		ewarn "You may need to fix the permissions of the file. To do so,"
		ewarn "you can run the command in the line below as root."
		ewarn "    'chmod 600 \"${save_file}\"'"
	fi

	if has_version 'sys-apps/systemd'; then
		elog "If you wish to enable the firewall rules on boot (on systemd) you"
		elog "will need to enable the nftables-restore service."
		elog "    'systemctl enable ${PN}-restore.service'"
		elog
		elog "If you are creating firewall rules before the next system restart"
		elog "the nftables-restore service must be manually started in order to"
		elog "save those rules on shutdown."
	fi
	if has_version 'sys-apps/openrc'; then
		elog "If you wish to enable the firewall rules on boot (on openrc) you"
		elog "will need to enable the nftables service."
		elog "    'rc-update add ${PN} default'"
		elog
		elog "If you are creating or updating the firewall rules and wish to save"
		elog "them to be loaded on the next restart, use the \"save\" functionality"
		elog "in the init script."
		elog "    'rc-service ${PN} save'"
	fi
}