#!/bin/bash

ID=$(/usr/bin/id -u)
[ $ID -ne 0 ] && echo "You must be root to run $0." && exit 1

#DESC Build generics table for sendmail to prevent .teleflora.com from getting added tosystem email from addresses.

tar cvfz /tmp/mail.tar.gz /etc/mail
[ "`grep ^DS /etc/mail/sendmail.cf | cut -dS -f2`" != "" ] && echo "Relay already configured." && exit 1
[ -d /etc/mail/auth ] && echo "Sendgrid configured on this server. Exiting in success." && exit 0
locate sendmail >>/dev/null
[ "$?" != "0" ] && echo "sendmail not found!" && exit 1
[ -f /etc/mail/genericstable ] && mv /etc/mail/genericstable /tmp/genericstable.bak

EMAIL_FROM="posserver@`hostname | cut -d. -f1`.com"

#1. Remove postfix if there and install and enable sendmail instead. (Good for RH6 and RH7.)
yum repolist
[ "$?" != "0" ] && echo "Server needs to be registered with Redhat." && exit 1
yum -y remove postfix
yum -y install sendmail sendmail-cf
[ "$?" != "0" ] && echo "Unable to install the required packages." && exit 1
chkconfig sendmail on

#3. Backup config files just in case.
cp -f /etc/mail/sendmail.mc /tmp/sendmail.mc.`date +"%m%d%H%M%S"`
cp -f /etc/mail/sendmail.cf /tmp/sendmail.cf.`date +"%m%d%H%M%S"`

#4. Create generics table.
if [ "$EMAIL_FROM" != "None" ]; then
     echo "root $EMAIL_FROM">>/etc/mail/genericstable
     echo "root@localhost $EMAIL_FROM">>/etc/mail/genericstable
     echo "root@`hostname`    $EMAIL_FROM">>/etc/mail/genericstable
     echo "root@`hostname`.teleflora.com    $EMAIL_FROM">>/etc/mail/genericstable
     echo "rti $EMAIL_FROM">>/etc/mail/genericstable
     echo "rti@localhost $EMAIL_FROM">>/etc/mail/genericstable
     echo "rti@`hostname`    $EMAIL_FROM">>/etc/mail/genericstable
     echo "rti@`hostname`.teleflora.com    $EMAIL_FROM">>/etc/mail/genericstable
     echo "tfsupport $EMAIL_FROM">>/etc/mail/genericstable
     echo "tfsupport@localhost $EMAIL_FROM">>/etc/mail/genericstable
     echo "tfsupport@`hostname`    $EMAIL_FROM">>/etc/mail/genericstable
     echo "tfsupport@`hostname`.teleflora.com    $EMAIL_FROM">>/etc/mail/genericstable
fi

#5. Make changes to sendmail.mc and build new sendmail.cf.
cp -f /etc/mail/sendmail.mc /etc/mail/sendmail.mc.new
sed -i '/^MAILER/d' /etc/mail/sendmail.mc.new
sed -i '/MAILER(cyrusv2)/d' /etc/mail/sendmail.mc.new
echo "FEATURE(authinfo,\`hash /etc/mail/auth/authinfo')dnl">>/etc/mail/sendmail.mc.new
echo "FEATURE(\`genericstable')dnl">>/etc/mail/sendmail.mc.new
echo "GENERICS_DOMAIN(\`localhost')dnl">>/etc/mail/sendmail.mc.new
echo "GENERICS_DOMAIN(\``hostname`')dnl">>/etc/mail/sendmail.mc.new
echo "GENERICS_DOMAIN(\``hostname`.teleflora.com')dnl">>/etc/mail/sendmail.mc.new
echo "MAILER(smtp)dnl">>/etc/mail/sendmail.mc.new
echo "MAILER(procmail)dnl">>/etc/mail/sendmail.mc.new
m4 /etc/mail/sendmail.mc.new > /etc/mail/sendmail.cf
mv -f /etc/mail/sendmail.mc.new /etc/mail/sendmail.mc

#8. Restart sendmail.
service sendmail restart

#9. Test email.
echo "Done."