#!/bin/sh

set -e

# Debian Postfix postinst
# LaMont Jones <lamont@debian.org>
# Based on debconf code by Colin Walters <walters@cis.ohio-state.edu>,
# and John Goerzen <jgoerzen@progenylinux.com>.

# Use debconf.
. /usr/share/debconf/confmodule
CHROOT=/var/spool/postfix

. /usr/share/postfix/postinst.functions

set_maildrop_perms() {
    MAILDROP=${CHROOT}/maildrop
    POSTDROP=/usr/sbin/postdrop
    mkdir -pZ $MAILDROP
    if ! chown postfix:postdrop $MAILDROP 2>/dev/null; then
	addgroup --system postdrop
	chown postfix:postdrop $MAILDROP
    fi
    dpkg-statoverride --remove $POSTDROP >/dev/null 2>&1 || true
    dpkg-statoverride --remove /var/spool/postfix/public >/dev/null 2>&1 || true
    dpkg-statoverride --remove /usr/sbin/postqueue >/dev/null 2>&1 || true
    dpkg-statoverride --update --add root postdrop 02555 $POSTDROP
    dpkg-statoverride --update --add postfix postdrop 02710 /var/spool/postfix/public
    dpkg-statoverride --update --add root postdrop 02555 /usr/sbin/postqueue
    chmod 1730 $MAILDROP
    # Make SE Linux happy (hopefully)
    if command -v restorecon >/dev/null; then
	restorecon "$POSTDROP" /var/spool/postfix/public /usr/sbin/postqueue
    fi
}

myfqdn() {
    myhostname=$(hostname --fqdn 2>/dev/null || echo "")
    # If we don't have a name with a dot (which includes ""), then we have work.
    if [ $myhostname = ${myhostname%.*} ]; then
	# If it's empty, and we have /etc/hostname, try that.
	if [ -z $myhostname ] && [ -r /etc/hostname ]; then
	    myhostname=$(cat /etc/hostname)
	fi
	# If we are still lacking a domain component, then try resolv.conf.
	if [ $myhostname = ${myhostname%.*} ]; then
	    if [ -f /etc/resolv.conf ]; then
		# The resolver uses the last one found, and ignores the rest
		mydom=$(sed -n 's/^search[[:space:]]*\.*\([^[:space:]]*\).*/\1/p;s/^domain[[:space:]]*\.*\([^[:space:]]*\).*/\1/p' /etc/resolv.conf | tail -1)
		myhostname="$myhostname${mydom:+.${mydom%.}}"
	    else
		myhostname="$myhostname.UNKNOWN"
	    fi
	fi
    fi
    echo $myhostname
}

fset_all_changed() {
    db_fset postfix/main_mailer_type changed $1
    db_fset postfix/root_address changed $1
    db_fset postfix/destinations changed $1
    db_fset postfix/mailname changed $1
    db_fset postfix/relayhost changed $1
    db_fset postfix/chattr changed $1
    db_fset postfix/mynetworks changed $1
    db_fset postfix/procmail changed $1
    db_fset postfix/mailbox_limit changed $1
    db_fset postfix/recipient_delim changed $1
    db_fset postfix/protocols changed $1
}

set_postconf() {
    CHANGES=true
    postconf -e "$@"
}

makedir() {
    if [ ! -d "$1" ]; then
	mkdir -Z "$1"
    fi
    chown $2 "$1"
    chmod $3 "$1"
}

fix_master() {
    OLD_VERSION="$1"
    echoed=""
    # Need to handle some changes in services.
    MASTER=/etc/postfix/master.cf
    if grep -qE '^cleanup[[:space:]]+unix[[:space:]]+-' ${MASTER}; then
	echo "In master.cf:"; echoed=y
	echo "  forcing pickup=unprivileged, cleanup=public, flush=public"
	sed 's/^\(cleanup[[:space:]]*unix[[:space:]]*\)-/\1n/
	     s/^\(flush[[:space:]]*unix[[:space:]]*\)-/\1n/
	     s/^\(pickup[[:space:]]*fifo[[:space:]]*.[[:space:]]*\)n/\1-/
	' ${MASTER} > ${MASTER}.$$
	mv ${MASTER}.$$ ${MASTER}
    fi

    while read line; do
	serv=${line%% *}
	if ! grep -qE "^${serv}[[:space:]]" ${MASTER}; then
	    [ -n "$echoed" ] || echo "In master.cf:"; echoed=y
	    echo "  adding missing entry for ${serv} service"
	    echo "$line" >> ${MASTER}
	fi
    done << @@EOF@@
flush     unix  n       -       y       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
trace     unix  -       -       y       -       0       bounce
verify    unix  -       -       y       -       1       verify
tlsmgr    unix  -       -       y       1000?   1       tlsmgr
anvil     unix  -       -       y       -       1       anvil
scache    unix  -       -       y       -       1       scache
discard   unix  -       -       y       -       -       discard
retry     unix  -       -       y       -       -       error
@@EOF@@

    if ! grep -qE '^relay[[:space:]]' ${MASTER}; then
	[ -n "$echoed" ] || echo "In master.cf:"; echoed=y
	echo "  adding missing entry for relay service"
	echo "relay     unix  -       -       n       -       -       smtp -o smtp_fallback_relay= " \
	    >> ${MASTER}
	echo "#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5" \
	    >> ${MASTER}
    fi

    if grep -qE '^tlsmgr[[:space:]]*fifo' ${MASTER}; then
	sed '/^tlsmgr/s/fifo/unix/' ${MASTER} > ${MASTER}.$$
	mv ${MASTER}.$$ ${MASTER}
    fi
}

add_root_alias() {
    db_get postfix/root_address && root_addr="$RET"
    ret=$(echo $RET | tr 'A-Z' 'a-z')
    if [ "$ret" != "none" ] && [ -n "$ret" ] ; then
	echo "adding root: $RET alias"
	echo "root:	$RET" >> /etc/aliases
    fi
}

umask 022

# postinst processing

case "$1" in
    configure)
	OLDVERSION="$2"
	# see below
	;;

    abort-upgrade)
	fix_master "$2"
	exit 0
	;;

    abort-remove|abort-deconfigure)
	exit 0
	;;

    *)
	echo "postinst called with unknown argument \`$1'" >&2
	exit 1
	;;
esac

CHANGES=""

dpkg-divert --package postfix --remove --rename \
	--divert /usr/share/man/man8/smtpd.real.8.gz \
	/usr/share/man/man8/smtpd.8.gz > /dev/null 2>&1

# handle sasl-smtp[d] -> smtp[d] change.  oops..
if [ -d /etc/postfix/sasl ]; then
    cd /etc/postfix/sasl
    for file in smtp smtpd; do
       if [ -r sasl-${file}.conf ] && [ ! -r ${file}.conf ]; then
	    ln -s sasl-${file}.conf ${file}.conf
       fi
    done
fi

cd ${CHROOT}
# make sure that the postfix user exists.  Simplest portable way to check is to
# chown something, so we'll create the directories that we need here.
makedir private		root:root 700
chgrp postfix private 2>/dev/null ||
    addgroup --system postfix
chown postfix private 2>/dev/null ||
    adduser --system --home ${CHROOT} --no-create-home --disabled-password --ingroup postfix postfix

# need to have postfix in the right group, but old revs do it wrong..
if [ "$(id -gn postfix)" != "postfix" ]; then
    usermod -g postfix postfix
fi

chown postfix:root private

db_fget postfix/chattr changed
if [ "$RET" = "true" ]; then
    db_get postfix/chattr && chat="$RET"
    echo "setting synchronous mail queue updates: $chat"
    if [ "$chat" = "true" ]; then
	chat="+S"
    else
	chat="-S"
    fi
fi

makedir pid root:root 755
makedir public postfix:root 755
for dir in incoming active bounce defer deferred flush saved corrupt; do
    makedir ${dir} postfix:root 700
    if [ -n "$chat" ]; then
	chattr $chat $dir 2>/dev/null || true
    fi
done

cd /etc/postfix

if [ ! -f dynamicmaps.cf ]; then
    echo "Creating /etc/postfix/dynamicmaps.cf"
    while read row; do
	# Keep the comment lines.
	if [ "X${row#\#}" != "X${row}" ]; then
	    echo "$row"
	else
	    # If the dictionary is on the system, add the row.  Subsequent
	    # installs will add the record themselves.
	    dict=${row%%[[:space:]]*}
	    if test -e /usr/lib/postfix/postfix-${dict}.so; then
		echo "$row"
	    fi
	fi
    done < /usr/share/postfix/dynamicmaps.cf > dynamicmaps.cf
    chmod 644 dynamicmaps.cf
fi

db_get postfix/main_mailer_type && mailer="$RET"

[ -f master.cf ] || cp /usr/share/postfix/master.cf.dist master.cf

if [ "$mailer" != "No configuration" ]; then	# [
    if [ -f main.cf ]; then
	NEWCONF=""
    else
	cp /usr/share/postfix/main.cf.debian main.cf
	if [ -f /etc/ssl/private/ssl-cert-snakeoil.key ]; then
	    cat /usr/share/postfix/main.cf.tls >> main.cf
	fi
	postconf -e "smtpd_relay_restrictions=permit_mynetworks permit_sasl_authenticated defer_unauth_destination"
	NEWCONF=yes
    fi

    # This is the braindead local-only master.cf from elsewhen
    # we now deal with this in main.cf, so mark the mailer_type changed.
    md5sum=$(md5sum /etc/postfix/master.cf)
    if [ "${md5sum%% *}" = "fadb677a071ea2851cc2b8a12345823d" ]; then
	cp /usr/share/postfix/master.cf.dist master.cf
	db_fset postfix/main_mailer_type changed true
    fi
fi	# !No configuration ]

# cleanup from braindamage.
if [ -d /etc/postfix/maildrop ]; then
    rmdir /etc/postfix/maildrop 2>/dev/null
fi

# cleanup old ca-certificates.crt that should never have been in chroot #991609
# can be removed after bookworm release
ca_bundle=/var/spool/postfix/etc/ssl/certs/ca-certificates.crt
if [ -f $ca_bundle ]; then
    echo Removing unneeded chroot file $ca_bundle
    rm -f $ca_bundle
fi

set_maildrop_perms postdrop

if [ "$mailer" != "No configuration" ]; then	# [
    myhostname=$(myfqdn)
    mydomain=${myhostname#*.}

    if [ -n "$NEWCONF" ]; then
	fset_all_changed true
	alias_maps=hash:/etc/aliases
	nis_status=$(dpkg -l nis 2>/dev/null | sed -n '$p')
	if [ "X$nis_status" != "X${nis_status#i}" ] && [ -x /usr/bin/ypcat ] &&
		/usr/bin/ypcat mail.aliases >/dev/null 2>&1; then
	    alias_maps="hash:/etc/aliases, nis:mail.aliases"
	    cat << EOF
It appears that you have an NIS map for mail aliases; using that in
addition to /etc/aliases.

EOF
	fi
	if [ -n "$myhostname" ]; then
	    echo "setting myhostname: $myhostname"
	    set_postconf "myhostname=$myhostname"
	fi
	echo "setting alias maps"
	set_postconf "alias_maps=$alias_maps"
	echo "setting alias database"
	set_postconf "alias_database=hash:/etc/aliases"
    else
	if [ -f /var/spool/postfix/mydomain-upgrade ]; then
	  rm -f /var/spool/postfix/mydomain-upgrade
	  db_get postfix/mydomain_upgrade && upgrade="$RET"
	  if [ "$upgrade" = "true" ]; then
	    echo "setting mydomain=$mydomain"
	    set_postconf "mydomain=$mydomain"
	  fi
	fi
    fi

    db_fget postfix/mailname changed
    if [ "$RET" = "true" ]; then
	db_get postfix/mailname && mailname="$RET"
	lcmailname="$(echo $RET| tr 'A-Z' 'a-z')"
	if [ "X$lcmailname" = "X==default==" ]; then
	    mailname=$(hostname --fqdn 2>/dev/null || echo localdomain)
	fi
	lcmailname="$(echo $mailname| tr 'A-Z' 'a-z')"
	if [ -f /etc/mailname ] && [ "X$(tr 'A-Z' 'a-z' < /etc/mailname)" = "X$lcmailname" ]; then
	    MAILNAME=""
	else
	    MAILNAME=yes
	fi
	if [ "X${lcmailname}" = Xubuntu.com ] || [ "X${lcmailname}" = Xdebian.org ]; then
	    echo "refusing to set mailname to ${mailname}."
	elif [ "X${mailname%.*}" != "X${mailname}" ]; then
	    if [ -n "$MAILNAME" ]; then
		echo "changing /etc/mailname to $mailname"
		echo $mailname > /etc/mailname
	    fi
	    echo "setting myorigin"
	    set_postconf "myorigin=/etc/mailname"
	else
	    echo "mailname is not a fully qualified domain name.  Not changing /etc/mailname."
	fi
    fi
    db_fget postfix/destinations changed
    if [ "$RET" = "true" ]; then
	db_get postfix/destinations && destinations="$RET"
	echo "setting destinations: $destinations"
	set_postconf "mydestination=$destinations"
    fi
    db_fget postfix/relayhost changed
    if [ "$RET" = "true" ]; then
	db_get postfix/relayhost && relayhost="$RET"
	echo "setting relayhost: $relayhost"
	set_postconf "relayhost=$relayhost"
    fi
    db_fget postfix/mynetworks changed
    if [ "$RET" = "true" ]; then
	db_get postfix/mynetworks && mynetworks="$RET"
	if [ -z "$RET" ]; then
	    echo "deleting mynetworks"
	    if grep -q '^mynetworks[[:space:]]*=' main.cf; then
		# need to remove it, get postconf to do the hard part.
		postconf -e 'mynetworks=127.0.0.0/8'
		sed -i -e '/^mynetworks\s*=/d' main.cf
	    fi
	else
	    echo "setting mynetworks: $mynetworks"
	    set_postconf "mynetworks=$mynetworks"
	fi
    fi
    db_fget postfix/procmail changed
    if [ "$RET" = "true" ]; then
	db_get postfix/procmail && useprocmail="$RET"
	if [ "x$useprocmail" = "xtrue" ]; then
	    echo "setting mailbox_command"
	    set_postconf 'mailbox_command=procmail -a "$EXTENSION"'
	else
	    if grep -q ^mailbox_command /etc/postfix/main.cf; then
		echo "clearing mailbox_command"
		set_postconf "mailbox_command="
	    fi
	fi
    fi
    db_fget postfix/mailbox_limit changed
    if [ "$RET" = "true" ]; then
	db_get postfix/mailbox_limit && mailbox_limit="$RET"
	echo "setting mailbox_size_limit: $mailbox_limit"
	set_postconf "mailbox_size_limit=$mailbox_limit"
    fi

    db_fget postfix/recipient_delim changed
    if [ "$RET" = "true" ]; then
	db_get postfix/recipient_delim && recip="$RET"
	echo "setting recipient_delimiter: $recip"
	set_postconf "recipient_delimiter=$recip"
    fi

    db_fget postfix/main_mailer_type changed
    if [ "$RET" = "true" ]; then
	# If the user has picked something other than smtp, keep it
	dtrans=$(postconf -hx default_transport)
	if [ $(postconf -hx default_transport) = error ]; then
	    dtrans=smtp
	fi
	# already have mailer
	case "$mailer" in
	    "Local only")	val=loopback-only; dtrans=error;;
	    "Satellite system")	val=loopback-only;;
	    *)			val=all;;
	esac
	echo "setting inet_interfaces: $val"
	set_postconf "inet_interfaces=$val"

	if [ $(postconf -hx default_transport) != $dtrans ]; then
	    echo "setting default_transport: $dtrans"
	    set_postconf "default_transport=$dtrans"
	    echo "setting relay_transport: $dtrans"
	    set_postconf "relay_transport=$dtrans"
	fi
    fi

    db_fget postfix/protocols changed
    if [ "$RET" = "true" ]; then
	db_get postfix/protocols && protocols="$RET"
	echo "setting inet_protocols: $protocols"
	set_postconf "inet_protocols=$protocols"
    fi

    if [ -z "$CHANGES" ]; then
	MSG="configuration was not changed"
    else
	if [ -n "$NEWCONF" ]; then
	    MSG="is now set up with a default configuration"
	else
	    MSG="is now set up with the changes above"
	fi
    fi
else	# ] No configuration [
    if [ -f main.cf ]; then
	MSG="configuration was untouched"
    else
	MSG="was not set up.  Start with
  cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf
"
	# make sure that we don't try anything stupid below.
        db_fset postfix/newaliases run false
	rm -f /var/spool/postfix/restart /var/spool/postfix/reload
    fi
fi	# not 'No configuration' ]

if [ ! -f /etc/aliases ]; then	# no /etc/aliases [
    echo "/etc/aliases does not exist, creating it."
    cat << EOF > /etc/aliases
# See man 5 aliases for format
postmaster:    root
EOF
    if [ "$mailer" != "No configuration" ]; then	# [
	db_fset postfix/newaliases run true
	db_fget postfix/root_address changed
	if [ "$RET" = "true" ]; then
	    add_root_alias
	fi
    fi	# not 'No configuration' ]
fi # ] no /etc/aliases

if [ "X$OLDVERSION" = "X" ]; then
    # On fresh installs, push a root alias into the file.
    if ! grep -q ^root: /etc/aliases && ! [ -f ~root/.forward ]; then
	add_root_alias
	db_fset postfix/newaliases run true
    fi
    # And update the doc dirs if postfix-doc is already unpacked
    if [ -f /etc/postfix/main.cf ] && \
       [ -f /usr/share/doc/postfix-doc/changelog.Debian.gz ]; then
	postconf -e	readme_directory=/usr/share/doc/postfix \
    			html_directory=/usr/share/doc/postfix/html
    fi
fi

db_fget postfix/root_address changed
if [ "$RET" = "true" ] && ! grep -q ^root: /etc/aliases; then
  echo "WARNING: /etc/aliases exists, but does not have a root alias."
fi

fset_all_changed false

fix_master "$2"

fold -s << EOF

Postfix (main.cf) $MSG.  If you need to make changes, edit /etc/postfix/main.cf (and others) as needed.  To view Postfix configuration values, see postconf(1).

After modifying main.cf, be sure to run 'systemctl reload postfix'.

EOF

# Fix old permissions
chown postfix:postfix /var/lib/postfix
if [ -f /var/lib/postfix/prng_exch ]; then
    chown postfix:postfix /var/lib/postfix/prng_exch
fi

if [ "X$OLDVERSION" = "X" ] && [ ! -f /etc/aliases.db ]; then
    db_fset postfix/newaliases run true
fi

if [ -x /usr/sbin/update-inetd ]; then
    update-inetd --disable smtp </dev/null >/dev/null 2>&1 || true
fi

# Make sure we have main/master.cf.proto for multi-inst (#838528)
if [ ! -f /etc/postfix/main.cf.proto ]; then
    cp /usr/share/postfix/main.cf.dist /etc/postfix/main.cf.proto
    rm -rf /etc/postfix/main.cf.proto.old
fi
if [ ! -f /etc/postfix/master.cf.proto ]; then
    cp /usr/share/postfix/master.cf.dist /etc/postfix/master.cf.proto
    rm -rf /etc/postfix/master.cf.proto.old
fi

if [ "$mailer" != "No configuration" ] || [ -f /etc/postfix/main.cf ]; then
    aliastype=$(postconf -h alias_database | cut -f1 -d:)
    if [ "$aliastype" != "ldap" ] && [ "$aliastype" != "lmdb" ] && \
        [ "$aliastype" != "cdb" ] && [ "$aliastype" != "pcre" ] && \
        [ "$aliastype" != "mysql" ] && [ "$aliastype" != "pgsql" ] && \
        [ "$aliastype" != "sqlite"  ] ; then
        runnewaliases
    else
        echo "Newaliases not run - external map type.  Ensure postfix-$aliastype is installed."
    fi
fi

# all done with debconf here.
db_stop

#DEBHELPER#

# we want it out of /etc to not be a conffile, but users might expect it there
# so leave a symlink at the expected place in /etc
if [ -f "/usr/share/postfix/makedefs.out" ]; then
    if [ ! -e "/etc/postfix/makedefs.out" ]; then
        ln -s /usr/share/postfix/makedefs.out /etc/postfix/makedefs.out
    fi
fi