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

EAPI="6"

inherit eutils toolchain-funcs multilib pam systemd

IUSE="dane dcc +dkim dlfunc dmarc +dnsdb doc dovecot-sasl dsn exiscan-acl gnutls ipv6 ldap libressl lmtp maildir mbx mysql nis pam perl pkcs11 postgres +prdr proxy radius redis sasl selinux spf sqlite srs ssl syslog tcpd tpda X elibc_glibc"
REQUIRED_USE="
	dane? ( !gnutls )
	dmarc? ( spf dkim )
	pkcs11? ( gnutls )
	spf? ( exiscan-acl )
	srs? ( exiscan-acl )
"

COMM_URI="ftp://ftp.exim.org/pub/exim/exim4$([[ ${PV} == *_rc* ]] && echo /test)"

DESCRIPTION="A highly configurable, drop-in replacement for sendmail"
SRC_URI="${COMM_URI}/${P//rc/RC}.tar.bz2
	mirror://gentoo/system_filter.exim.gz
	doc? ( ${COMM_URI}/${PN}-pdf-${PV//rc/RC}.tar.bz2 )"
HOMEPAGE="http://www.exim.org/"

SLOT="0"
LICENSE="GPL-2"
KEYWORDS="~alpha ~amd64 ~arm ~hppa ~ia64 ~ppc ~ppc64 ~sparc ~x86 ~x86-fbsd ~x86-solaris"

COMMON_DEPEND=">=sys-apps/sed-4.0.5
	>=sys-libs/db-3.2:=
	dev-libs/libpcre
	perl? ( dev-lang/perl:= )
	pam? ( virtual/pam )
	tcpd? ( sys-apps/tcp-wrappers )
	ssl? (
		!libressl? ( dev-libs/openssl:0= )
		libressl? ( dev-libs/libressl:= )
	)
	gnutls? ( net-libs/gnutls[pkcs11?]
			  dev-libs/libtasn1 )
	ldap? ( >=net-nds/openldap-2.0.7 )
	nis? ( elibc_glibc? ( || (
		<sys-libs/glibc-2.23
		>=sys-libs/glibc-2.23[rpc]
	) ) )
	mysql? ( virtual/libmysqlclient )
	postgres? ( dev-db/postgresql:= )
	sasl? ( >=dev-libs/cyrus-sasl-2.1.26-r2 )
	redis? ( dev-libs/hiredis )
	spf? ( >=mail-filter/libspf2-1.2.5-r1 )
	dmarc? ( mail-filter/opendmarc )
	srs? ( mail-filter/libsrs_alt )
	X? ( x11-proto/xproto
		x11-libs/libX11
		x11-libs/libXmu
		x11-libs/libXt
		x11-libs/libXaw
	)
	sqlite? ( dev-db/sqlite )
	radius? ( net-dialup/freeradius-client )
	virtual/libiconv
	"
	# added X check for #57206
DEPEND="${COMMON_DEPEND}
	virtual/pkgconfig"
RDEPEND="${COMMON_DEPEND}
	!mail-mta/courier
	!mail-mta/esmtp
	!mail-mta/mini-qmail
	!<mail-mta/msmtp-1.4.19-r1
	!>=mail-mta/msmtp-1.4.19-r1[mta]
	!mail-mta/netqmail
	!mail-mta/nullmailer
	!mail-mta/postfix
	!mail-mta/qmail-ldap
	!mail-mta/sendmail
	!mail-mta/opensmtpd
	!<mail-mta/ssmtp-2.64-r2
	!>=mail-mta/ssmtp-2.64-r2[mta]
	!net-mail/mailwrapper
	>=net-mail/mailbase-0.00-r5
	virtual/logger
	dcc? ( mail-filter/dcc )
	selinux? ( sec-policy/selinux-exim )
	"

S=${WORKDIR}/${P//rc/RC}

src_prepare() {
	epatch "${FILESDIR}"/exim-4.14-tail.patch
	epatch "${FILESDIR}"/exim-4.74-localscan_dlopen.patch
	epatch "${FILESDIR}"/exim-4.69-r1.27021.patch
	epatch "${FILESDIR}"/exim-4.74-radius-db-ENV-clash.patch # 287426
	epatch "${FILESDIR}"/exim-4.82-makefile-freebsd.patch # 235785
	epatch "${FILESDIR}"/exim-4.89-as-needed-ldflags.patch # 352265, 391279
	epatch "${FILESDIR}"/exim-4.76-crosscompile.patch # 266591

	if use maildir ; then
		epatch "${FILESDIR}"/exim-4.20-maildir.patch
	else
		epatch "${FILESDIR}"/exim-4.80-spool-mail-group.patch # 438606
	fi

	eapply_user

	# user Exim believes it should be
	MAILUSER=mail
	MAILGROUP=mail
	if use prefix && [[ ${EUID} != 0 ]] ; then
		MAILUSER=$(id -un)
		MAILGROUP=$(id -gn)
	fi
}

src_configure() {
	# general config and paths

	sed -i.orig \
		-e "/SYSTEM_ALIASES_FILE/s'SYSTEM_ALIASES_FILE'${EPREFIX}/etc/mail/aliases'" \
		"${S}"/src/configure.default || die

	sed -i -e 's/^buildname=.*/buildname=exim-gentoo/g' Makefile || die

	sed -e "48i\CFLAGS=${CFLAGS}" \
		-e "s:BIN_DIRECTORY=/usr/exim/bin:BIN_DIRECTORY=${EPREFIX}/usr/sbin:" \
		-e "s:EXIM_USER=:EXIM_USER=${MAILUSER}:" \
		-e "s:CONFIGURE_FILE=/usr/exim/configure:CONFIGURE_FILE=${EPREFIX}/etc/exim/exim.conf:" \
		-e "s:ZCAT_COMMAND=.*$:ZCAT_COMMAND=${EPREFIX}/bin/zcat:" \
		-e "s:COMPRESS_COMMAND=.*$:COMPRESS_COMMAND=${EPREFIX}/bin/gzip:" \
		src/EDITME > Local/Makefile

	if use elibc_musl; then
		sed -e 's/^LIBS = -lnsl/LIBS =/g' \
		-i OS/Makefile-Linux
	fi

	cd Local

	cat >> Makefile <<- EOC
		INFO_DIRECTORY=${EPREFIX}/usr/share/info
		PID_FILE_PATH=${EPREFIX}/run/exim.pid
		SPOOL_DIRECTORY=${EPREFIX}/var/spool/exim
		HAVE_ICONV=yes
	EOC

	# if we use libiconv, now is the time to tell so
	use !elibc_glibc && use !elibc_musl && echo "EXTRALIBS_EXIM=-liconv" >> Makefile

	# support for IPv6
	if use ipv6; then
		cat >> Makefile <<- EOC
			HAVE_IPV6=YES
		EOC
	fi

	#
	# mail storage formats

	# mailstore is Exim's traditional storage format
	cat >> Makefile <<- EOC
		SUPPORT_MAILSTORE=yes
	EOC

	# mbox
	if use mbx; then
		cat >> Makefile <<- EOC
			SUPPORT_MBX=yes
		EOC
	fi

	# maildir
	if use maildir; then
		cat >> Makefile <<- EOC
			SUPPORT_MAILDIR=yes
		EOC
	fi

	#
	# lookup methods

	# use the "native" interfaces to the DBM and CDB libraries, support
	# passwd and directory lookups by default
	cat >> Makefile <<- EOC
		USE_DB=yes
		DBMLIB=-ldb
		LOOKUP_CDB=yes
		LOOKUP_PASSWD=yes
		LOOKUP_DSEARCH=yes
	EOC

	if ! use dnsdb; then
		# DNSDB lookup is enabled by default
		sed -i "s:^LOOKUP_DNSDB=yes:# LOOKUP_DNSDB=yes:" Makefile
	fi

	if use ldap; then
		cat >> Makefile <<- EOC
			LOOKUP_LDAP=yes
			LDAP_LIB_TYPE=OPENLDAP2
			LOOKUP_INCLUDE += -I"${EROOT}"usr/include/ldap
			LOOKUP_LIBS += -lldap -llber
		EOC
	fi

	if use mysql; then
		cat >> Makefile <<- EOC
			LOOKUP_MYSQL=yes
			LOOKUP_INCLUDE += $(mysql_config --include)
			LOOKUP_LIBS += $(mysql_config --libs)
		EOC
	fi

	if use nis; then
		cat >> Makefile <<- EOC
			LOOKUP_NIS=yes
			LOOKUP_NISPLUS=yes
		EOC
	fi

	if use postgres; then
		cat >> Makefile <<- EOC
			LOOKUP_PGSQL=yes
			LOOKUP_INCLUDE += -I$(pg_config --includedir)
			LOOKUP_LIBS += -L$(pg_config --libdir) -lpq
		EOC
	fi

	if use sqlite; then
		cat >> Makefile <<- EOC
			LOOKUP_SQLITE=yes
			LOOKUP_SQLITE_PC=sqlite3
		EOC
	fi

	if use redis; then
		cat >> Makefile <<- EOC
			LOOKUP_REDIS=yes
			LOOKUP_LIBS += -lhiredis
		EOC
	fi

	#
	# Exim monitor, enabled by default, controlled via X USE-flag,
	# disable if not requested, bug #46778
	if use X; then
		cp ../exim_monitor/EDITME eximon.conf || die
	else
		sed -i -e '/^EXIM_MONITOR=/s/^/# /' Makefile
	fi

	#
	# features

	# content scanning support
	if use exiscan-acl; then
		cat >> Makefile <<- EOC
			WITH_CONTENT_SCAN=yes
			WITH_OLD_DEMIME=yes
		EOC
	fi

	# DomainKeys Identified Mail, RFC4871
	if ! use dkim; then
		# DKIM is enabled by default
		cat >> Makefile <<- EOC
			DISABLE_DKIM=yes
		EOC
	fi

	# Per-Recipient-Data-Response
	if ! use prdr; then
		# PRDR is enabled by default
		cat >> Makefile <<- EOC
			DISABLE_PRDR=yes
		EOC
	fi

	# log to syslog
	if use syslog; then
		sed -i "s:LOG_FILE_PATH=/var/log/exim/exim_%s.log:LOG_FILE_PATH=syslog:" Makefile
		cat >> Makefile <<- EOC
			LOG_FILE_PATH=syslog
		EOC
	else
		cat >> Makefile <<- EOC
			LOG_FILE_PATH=${EPREFIX}/var/log/exim/exim_%s.log
		EOC
	fi

	# starttls support (ssl)
	if use ssl; then
		echo "SUPPORT_TLS=yes" >> Makefile
		if use gnutls; then
			echo "USE_GNUTLS=yes" >> Makefile
			echo "USE_GNUTLS_PC=gnutls" >> Makefile
			use pkcs11 || echo "AVOID_GNUTLS_PKCS11=yes" >> Makefile
		else
			echo "USE_OPENSSL_PC=openssl" >> Makefile
		fi
	fi

	# TCP wrappers
	if use tcpd; then
		cat >> Makefile <<- EOC
			USE_TCP_WRAPPERS=yes
			EXTRALIBS_EXIM += -lwrap
		EOC
	fi

	# Light Mail Transport Protocol
	if use lmtp; then
		cat >> Makefile <<- EOC
			TRANSPORT_LMTP=yes
		EOC
	fi

	# embedded Perl
	if use perl; then
		cat >> Makefile <<- EOC
			EXIM_PERL=perl.o
		EOC
	fi

	# dlfunc
	if use dlfunc; then
		cat >> Makefile <<- EOC
			EXPAND_DLFUNC=yes
		EOC
	fi

	#
	# experimental features

	# DANE
	if use dane; then
		cat >> Makefile <<- EOC
			EXPERIMENTAL_DANE=yes
		EOC
	fi

	# Distributed Checksum Clearinghouse
	if use dcc; then
		echo "EXPERIMENTAL_DCC=yes">> Makefile
	fi

	# Sender Policy Framework
	if use spf; then
		cat >> Makefile <<- EOC
			EXPERIMENTAL_SPF=yes
			EXTRALIBS_EXIM += -lspf2
		EOC
	fi

	# Sender Rewriting Scheme
	if use srs; then
		cat >> Makefile <<- EOC
			EXPERIMENTAL_SRS=yes
			EXTRALIBS_EXIM += -lsrs_alt
		EOC
	fi

	# DMARC
	if use dmarc; then
		cat >> Makefile <<- EOC
			EXPERIMENTAL_DMARC=yes
			EXTRALIBS_EXIM += -lopendmarc
		EOC
	fi

	# Transport post-delivery actions
	if use tpda; then
		cat >> Makefile <<- EOC
			EXPERIMENTAL_EVENT=yes
		EOC
	fi

	# Proxy Protocol
	if use proxy; then
		cat >> Makefile <<- EOC
			EXPERIMENTAL_PROXY=yes
		EOC
	fi

	# Delivery Sender Notifications
	if use dsn; then
		cat >> Makefile <<- EOC
			EXPERIMENTAL_DSN=yes
		EOC
	fi

	#
	# authentication (SMTP AUTH)

	# standard bits
	cat >> Makefile <<- EOC
		AUTH_SPA=yes
		AUTH_CRAM_MD5=yes
		AUTH_PLAINTEXT=yes
	EOC

	# Cyrus SASL
	if use sasl; then
		cat >> Makefile <<- EOC
			CYRUS_SASLAUTHD_SOCKET=${EPREFIX}/run/saslauthd/mux
			AUTH_CYRUS_SASL=yes
			AUTH_LIBS += -lsasl2
		EOC
	fi

	# Dovecot
	if use dovecot-sasl; then
		cat >> Makefile <<- EOC
			AUTH_DOVECOT=yes
		EOC
	fi

	# Pluggable Authentication Modules
	if use pam; then
		cat >> Makefile <<- EOC
			SUPPORT_PAM=yes
			AUTH_LIBS += -lpam
		EOC
	fi

	# Radius
	if use radius; then
		cat >> Makefile <<- EOC
			RADIUS_CONFIG_FILE=${EPREFIX}/etc/radiusclient/radiusclient.conf
			RADIUS_LIB_TYPE=RADIUSCLIENTNEW
			AUTH_LIBS += -lfreeradius-client
		EOC
	fi
}

src_compile() {
	emake CC="$(tc-getCC)" HOSTCC="$(tc-getCC $CBUILD)" \
		AR="$(tc-getAR) cq" RANLIB="$(tc-getRANLIB)" FULLECHO='' \
		|| die "make failed"
}

src_install () {
	cd "${S}"/build-exim-gentoo || die
	dosbin exim
	if use X; then
		dosbin eximon.bin
		dosbin eximon
	fi
	fperms 4755 /usr/sbin/exim

	dosym exim /usr/sbin/sendmail
	dosym exim /usr/sbin/rsmtp
	dosym exim /usr/sbin/rmail
	dosym /usr/sbin/exim /usr/bin/mailq
	dosym /usr/sbin/exim /usr/bin/newaliases
	dosym /usr/sbin/sendmail /usr/lib/sendmail

	for i in exicyclog exim_dbmbuild exim_dumpdb exim_fixdb exim_lock \
		exim_tidydb exinext exiwhat exigrep eximstats exiqsumm exiqgrep \
		convert4r3 convert4r4 exipick
	do
		dosbin $i
	done

	dodoc "${S}"/doc/*
	doman "${S}"/doc/exim.8
	use dsn && dodoc "${S}"/README.DSN
	use doc && dodoc "${WORKDIR}"/${PN}-pdf-${PV//rc/RC}/doc/*.pdf

	# conf files
	insinto /etc/exim
	newins "${S}"/src/configure.default exim.conf.dist
	if use exiscan-acl; then
		newins "${S}"/src/configure.default exim.conf.exiscan-acl
	fi
	doins "${WORKDIR}"/system_filter.exim
	doins "${FILESDIR}"/auth_conf.sub

	pamd_mimic system-auth exim auth account

	# headers, #436406
	if use dlfunc ; then
		# fixup includes so they actually can be found when including
		sed -i \
			-e '/#include "\(config\|store\|mytypes\).h"/s:"\(.\+\)":<exim/\1>:' \
			local_scan.h || die
		insinto /usr/include/exim
		doins {config,local_scan}.h ../src/{mytypes,store}.h
	fi

	insinto /etc/logrotate.d
	newins "${FILESDIR}/exim.logrotate" exim

	newinitd "${FILESDIR}"/exim.rc9 exim
	newconfd "${FILESDIR}"/exim.confd exim

	systemd_dounit "${FILESDIR}"/{exim.service,exim.socket,exim-submission.socket}
	systemd_newunit "${FILESDIR}"/exim_at.service 'exim@.service'
	systemd_newunit "${FILESDIR}"/exim-submission_at.service 'exim-submission@.service'

	diropts -m 0750 -o ${MAILUSER} -g ${MAILGROUP}
	dodir /var/log/${PN}
}

pkg_postinst() {
	if [[ ! -f ${EROOT}etc/exim/exim.conf ]] ; then
		einfo "${EROOT}etc/exim/system_filter.exim is a sample system_filter."
		einfo "${EROOT}etc/exim/auth_conf.sub contains the configuration sub for using smtp auth."
		einfo "Please create ${EROOT}etc/exim/exim.conf from ${EROOT}etc/exim/exim.conf.dist."
	fi
	use dane && einfo "DANE support is experimental"
	if use dcc ; then
		einfo "DCC support is experimental, you can find some limited"
		einfo "documentation at the bottom of this prerelease message:"
		einfo "http://article.gmane.org/gmane.mail.exim.devel/3579"
	fi
	use spf && einfo "SPF support is experimental"
	use srs && einfo "SRS support is experimental"
	if use dmarc ; then
		einfo "DMARC support is experimental.  See global settings to"
		einfo "configure DMARC, for usage see the documentation at "
		einfo "experimental-spec.txt."
	fi
	use tpda && einfo "TPDA/EVENT support is experimental"
	use proxy && einfo "proxy support is experimental"
	use dsn && einfo "DSN support is experimental"
	elog "The obsolete acl condition 'demime' is removed, the replacements"
	elog "are the ACLs acl_smtp_mime and acl_not_smtp_mime"
}