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# Copyright 1999-2017 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

EAPI=6

inherit linux-mod bash-completion-r1

DESCRIPTION="Simple yet fast and modern VPN that utilizes state-of-the-art cryptography."
HOMEPAGE="https://www.wireguard.io/"

if [[ ${PV} == 9999 ]]; then
	inherit git-r3
	EGIT_REPO_URI="https://git.zx2c4.com/WireGuard"
	KEYWORDS=""
else
	SRC_URI="https://git.zx2c4.com/WireGuard/snapshot/WireGuard-${PV}.tar.xz"
	S="${WORKDIR}/WireGuard-${PV}"
	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86"
fi

LICENSE="GPL-2"
SLOT="0"
IUSE="debug +module +tools module-src"

DEPEND="tools? ( net-libs/libmnl )"
RDEPEND="${DEPEND}"

MODULE_NAMES="wireguard(net:src)"
BUILD_PARAMS="KERNELDIR=${KERNEL_DIR} V=1"
BUILD_TARGETS="module"
CONFIG_CHECK="NET INET NET_UDP_TUNNEL NF_CONNTRACK NETFILTER_XT_MATCH_HASHLIMIT CRYPTO_BLKCIPHER ~PADATA ~IP6_NF_IPTABLES"
WARNING_PADATA="If you're running a multicore system you likely should enable CONFIG_PADATA for improved performance and parallel crypto."
WARNING_IP6_NF_IPTABLES="If your kernel has CONFIG_IPV6, you need CONFIG_IP6_NF_IPTABLES; otherwise WireGuard will not insert."

pkg_setup() {
	if use module; then
		linux-mod_pkg_setup
		kernel_is -lt 3 10 0 && die "This version of ${PN} requires Linux >= 3.10"
	fi
}

src_compile() {
	use debug && BUILD_PARAMS="CONFIG_WIREGUARD_DEBUG=y ${BUILD_PARAMS}"
	use module && linux-mod_src_compile
	use tools && emake RUNSTATEDIR="${EPREFIX}/run" -C src/tools
}

src_install() {
	use module && linux-mod_src_install
	if use tools; then
		dodoc README.md
		dodoc -r contrib/examples
		emake \
			WITH_BASHCOMPLETION=yes \
			WITH_SYSTEMDUNITS=yes \
			WITH_WGQUICK=yes \
			DESTDIR="${D}" \
			BASHCOMPDIR="$(get_bashcompdir)" \
			PREFIX="${EPREFIX}/usr" \
			-C src/tools install
		insinto /$(get_libdir)/netifrc/net
		newins "${FILESDIR}"/wireguard-openrc.sh wireguard.sh
	fi
	use module-src && emake DESTDIR="${D}" PREFIX="${EPREFIX}/usr" -C src dkms-install
}

pkg_postinst() {
	if use module-src && ! use module; then
		einfo
		einfo "You have enabled the module-src USE flag without the module USE"
		einfo "flag. This means that sources are installed to"
		einfo "${ROOT}usr/src/wireguard instead of having the"
		einfo "kernel module compiled. You will need to compile the module"
		einfo "yourself. Most likely, you don't want this USE flag, and should"
		einfo "rather use USE=module"
		einfo
	fi
	use module && linux-mod_pkg_postinst

	ewarn
	ewarn "This software is experimental and has not yet been released."
	ewarn "As such, it may contain significant issues. Please do not file"
	ewarn "bug reports with Gentoo, but rather direct them upstream to:"
	ewarn
	ewarn "    team@wireguard.io    security@wireguard.io"
	ewarn

	if use tools; then
		einfo
		einfo "After installing WireGuard, if you'd like to try sending some packets through"
		einfo "WireGuard, you may use, for testing purposes only, the insecure client.sh"
		einfo "test example script:"
		einfo
		einfo "  \$ bzcat ${ROOT}usr/share/doc/${PF}/examples/ncat-client-server/client.sh.bz2 | sudo bash -"
		einfo
		einfo "This will automatically setup interface wg0, through a very insecure transport"
		einfo "that is only suitable for demonstration purposes. You can then try loading the"
		einfo "hidden website or sending pings:"
		einfo
		einfo "  \$ chromium http://192.168.4.1"
		einfo "  \$ ping 192.168.4.1"
		einfo
		einfo "If you'd like to redirect your internet traffic, you can run it with the"
		einfo "\"default-route\" argument. You may not use this server for any abusive or illegal"
		einfo "purposes. It is for quick testing only."
		einfo
		einfo "More info on getting started can be found at: https://www.wireguard.io/quickstart/"
		einfo
	fi
}