shcheck/checks/mail.sh

#Copyright (C) 2016,2023 Weber Yann
#
#This program is free software; you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation; either version 3 of the License, or
#any later version.
#
#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with this program.  If not, see <http://www.gnu.org/licenses/>.

check_smtp() {
	hostname=$1
	port=$2
	if [ -z "$port" ]
	then
		port=587
	fi
	code=$(nc -q0 "$hostname" "$port" < /dev/null | cut -d " " -f1)
	if [ "$code" = "220" ]
	then
		success "SMTP@$hostname server replied 220 status"
	else
		fail "Unexpected reply from smtp@$hostname '$code'"
	fi
}

check_smtp_id() {
	hostname=$1
	idstr=$2
	port=$3
	if [ -z "$port" ]
	then
		port=587
	fi
	rep=$(nc -q0 "$hostname" "$port" < /dev/null)
	if echo "$rep" | grep -e "^220 $idstr" > /dev/null
	then
		success "SMTP@$hostname server replie '$idstr'"
	else
		fail "Unexpected reply from smtp@$hostname '$rep'"
	fi
}

check_imaps() {
	hostname=$1
	port=$2
	if [ -z "$port" ]
	then
		port=993
	fi
	rep=$(echo "01 LOGOUT" | openssl s_client -quiet -verify_quiet -connect "${hostname}:$port" -servername "$hostname")

	if echo "$rep" | grep "^01 OK" > /dev/null
	then
		success "IMAPS@$hostname '$(echo "$rep" | grep "^01 OK")'"
	else
		fail "Unexpected reply from imaps@$hostname '$rep'"
	fi
}