#!/run/current-system/sw/bin/bash

write_line() {
	sleep 0.1${RANDOM}
	echo "-> $*"
	echo "$*" >&99
	sleep 0.1${RANDOM}
}
get_last_reply() {
	sleep 1
	tail -1 ${MAILTMP}
}
make_mail() {
	FROM="$1"
	TO="$2"
	SUBJECT="$3"
	echo "Message-Id: <${RANDOM}${RANDOM}${RANDOM}${RANDOM}${RANDOM}@${HOSTNAME}>"
	echo "From: <${FROM}>"
	echo "To: <${TO}>"
	echo "Date: $(LANG=C date "+%a, %d %b %Y %H:%M:%S %z")"
	echo "Subject: ${SUBJECT}"
	echo ''
	echo 'Hallo Nina,'
	echo ''
	echo 'wie geht es dir?'
	echo ''
	echo 'Gruß'
	echo 'Daniel'
}
test_mail() {
	echo '####################### Next test'
	echo "########### FROM:    ${FROM}"
	echo "########### TO:      ${TO}"
	echo "########### SUBJECT: ${SUBJECT}"
	# Open the connection
	exec 99<>/dev/tcp/${SERVER}/smtp
	sed -e 's_^_<- _' <&99 &
	SEDPID=$!
	write_line "EHLO ${HOSTNAME}"
	write_line "MAIL FROM: <${FROM}>"
	write_line "RCPT TO: <${TO}>"
	write_line 'DATA'
	write_line "$(make_mail ${FROM} ${TO} "${SUBJECT}")"
	write_line '.'
	write_line 'QUIT'
	wait ${SEDPID}
	# Close the fd
	exec 99<&-
}

if [ $# -gt 0 ]; then
	SERVER="$1"
	FROM="$2"
	TO="$3"
	SUBJECT="$4"
	test_mail
	exit
fi

$0 myserver.mydomain.com valid_outside_email@example.org validuser@mydomain.com "Test 1: regular delivery"
echo '####################### Expected result: 250 2.0.0 Ok: queued as'
echo



$0 myserver.mydomain.com valid_outside_email@example.org someone@mydomain.com "Test 2: unknown user reject"
echo '####################### Expected result: 550 5.1.1 <someone@mydomain.com>: Recipient address rejected: User unknown in virtual mailbox table'
echo



$0 myserver.mydomain.com valid_outside_email@example.org root@myserver.mydomain.com "Test 3: local server users"
echo '####################### Expected result: 554 5.7.1 <root@myserver.mydomain.com>: Relay access denied'
echo



$0 myserver.mydomain.com valid_outside_email@example.org root@localhost "Test 4: localhost users"
echo '####################### Expected result: 554 5.7.1 <root@localhost>: Relay access denied'
echo



$0 myserver.mydomain.com valid_outside_email@example.org root@myserver.mydomain.com "Test 5: local users"
echo '####################### Expected result: 554 5.7.1 <root@myserver.mydomain.com>: Relay access denied'
echo



$0 myserver.mydomain.com valid_outside_email@example.org elsewhere@example.com "Test 6: relay access test"
echo '####################### Expected result: 554 5.7.1 <elsewhere@example.com>: Relay access denied'
echo