# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

# Force users doing their own patches to install their own tools
AUTOTOOLS_AUTO_DEPEND=no

inherit multilib systemd toolchain-funcs autotools flag-o-matic usr-ldscript

DESCRIPTION="Linux kernel (2.4+) firewall, NAT and packet mangling tools"
HOMEPAGE="https://www.netfilter.org/projects/iptables/"
SRC_URI="https://www.netfilter.org/projects/iptables/files/${P}.tar.bz2"

LICENSE="GPL-2"
# Subslot reflects PV when libxtables and/or libip*tc was changed
# the last time.
SLOT="0/1.8.3"
KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
IUSE="conntrack ipv6 netlink nftables pcap static-libs"

COMMON_DEPEND="
	conntrack? ( >=net-libs/libnetfilter_conntrack-1.0.6 )
	netlink? ( net-libs/libnfnetlink )
	nftables? (
		>=net-libs/libmnl-1.0:0=
		>=net-libs/libnftnl-1.1.3:0=
	)
	pcap? ( net-libs/libpcap )
"
DEPEND="${COMMON_DEPEND}
	virtual/os-headers
	>=sys-kernel/linux-headers-4.4:0
"
BDEPEND="
	virtual/pkgconfig
	nftables? (
		sys-devel/flex
		virtual/yacc
	)
"
RDEPEND="${COMMON_DEPEND}
	nftables? ( net-misc/ethertypes )
"

src_prepare() {
	# use the saner headers from the kernel
	rm include/linux/{kernel,types}.h || die

	eapply "${FILESDIR}"/${PN}-1.8.2-link.patch
	eapply_user
	eautoreconf
}

src_configure() {
	# Some libs use $(AR) rather than libtool to build #444282
	tc-export AR

	# Hack around struct mismatches between userland & kernel for some ABIs. #472388
	use amd64 && [[ ${ABI} == "x32" ]] && append-flags -fpack-struct

	sed -i \
		-e "/nfnetlink=[01]/s:=[01]:=$(usex netlink 1 0):" \
		-e "/nfconntrack=[01]/s:=[01]:=$(usex conntrack 1 0):" \
		configure || die

	local myeconfargs=(
		--sbindir="${EPREFIX}/sbin"
		--libexecdir="${EPREFIX}/$(get_libdir)"
		--enable-devel
		--enable-shared
		$(use_enable nftables)
		$(use_enable pcap bpf-compiler)
		$(use_enable pcap nfsynproxy)
		$(use_enable static-libs static)
		$(use_enable ipv6)
	)
	econf "${myeconfargs[@]}"
}

src_compile() {
	# Deal with parallel build errors.
	use nftables && emake -C iptables xtables-config-parser.h
	emake V=1
}

src_install() {
	default
	dodoc INCOMPATIBILITIES iptables/iptables.xslt

	# all the iptables binaries are in /sbin, so might as well
	# put these small files in with them
	into /
	dosbin iptables/iptables-apply
	dosym iptables-apply /sbin/ip6tables-apply
	doman iptables/iptables-apply.8

	insinto /usr/include
	doins include/iptables.h $(use ipv6 && echo include/ip6tables.h)
	insinto /usr/include/iptables
	doins include/iptables/internal.h

	keepdir /var/lib/iptables
	newinitd "${FILESDIR}"/${PN}-r2.init iptables
	newconfd "${FILESDIR}"/${PN}-r1.confd iptables
	if use ipv6 ; then
		keepdir /var/lib/ip6tables
		dosym iptables /etc/init.d/ip6tables
		newconfd "${FILESDIR}"/ip6tables-r1.confd ip6tables
	fi

	if use nftables; then
		# Bug 647458
		rm "${ED}"/etc/ethertypes || die

		# Bug 660886
		rm "${ED}"/sbin/{arptables,ebtables} || die

		# Bug 669894
		rm "${ED}"/sbin/ebtables-{save,restore} || die
	fi

	systemd_dounit "${FILESDIR}"/systemd/iptables-{re,}store.service
	if use ipv6 ; then
		systemd_dounit "${FILESDIR}"/systemd/ip6tables-{re,}store.service
	fi

	# Move important libs to /lib #332175
	gen_usr_ldscript -a ip{4,6}tc iptc xtables

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