#!/bin/bash

#DESC Configures Sendgrid. Need API Key and email from add.

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

#--Configure RTI Server for Sendgrid email relay.

#a. Get API Key.
echo -n "Enter API Key: "
read APIKEY
 
#b. Get Email From Address.
echo -n "Enter Server Email From Address: "
read EMAIL_FROM
[ "$EMAIL_FROM" == "" ] && EMAIL_FROM="None"

#c. Be Sure.
echo "APIKEY: $APIKEY"
echo "SERVER EMAIL ADDRESS: $EMAIL_FROM"
echo -n "Are these correct? (Y/N):"
read REPLY
[ "$REPLY" != "Y" ] && exit 1

#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

#2. Create mail auth folder.
rm -rf /etc/mail/auth
mkdir /etc/mail/auth
chmod 777 /etc/mail/auth

#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
echo "define(\`SMART_HOST',\`smtp.sendgrid.net')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

#6. Create authentication file and build authentication db.
echo "AuthInfo:smtp.sendgrid.net \"U:apikey\"  \"P:$APIKEY\"   \"M:PLAIN\"">/etc/mail/auth/authinfo
makemap hash /etc/mail/auth/authinfo < /etc/mail/auth/authinfo

#7. Set permissions on authentication files.
chmod 600 /etc/mail/auth/authinfo
chmod 700 /etc/mail/auth

#8. Restart sendmail.
service sendmail restart

#9. Test email.
echo "Done."