Shell Scripting for Dovecot configuring in Linux

Dovecot is an open-source IMAP and POP3 server for Linux/UNIX-like frameworks, composed essentially with security in mind. Timo Sirainen began Dovecot and first discharged it in July 2002. Dovecot engineers basically mean to deliver a lightweight, quick and simple to-set-up open-source mailserver.

echo "****  Configuring Dovecot    **************************"
   if rpm -qa|grep dovecot
   then
   {
   echo "**************   Dovecot Installation  ****************"
   echo  '!include conf.d/*.conf' > /etc/dovecot/dovecot.conf
   echo "protocols = imap pop3 lmtp">>/etc/dovecot/dovecot.conf
   echo 'mbox_write_locks = fcntl
   mail_location = maildir:~/Maildir
   '>/etc/dovecot/conf.d/10-mail.conf
   echo 'disable_plaintext_auth = no
   !include auth-system.conf.ext
   auth_mechanisms = plain login'>/etc/dovecot/conf.d/10-auth.conf
 
   echo "********* Service Dovecot Restart *********************"
   clear
   echo ""
   echo ""
   service dovecot restart
   echo ""
   echo "  *************************************************************"
   echo "  *    Dovecot configuration has benn completed               *"
   echo "  *                Enjoy it                                   *"
   echo "  *************************************************************"
   }
 else
  echo "   *************************************************************"
  echo "   *           There is no rpm for dovecot                     *"
  echo "   *           So please install rpm first                     *"
  echo "   *************************************************************"
  fi

For Basic Configuration This is enough to receive mail. We will must add rules in IPTABLES for this.

Scripting for Postfix Mail Server configuration

echo "    *************** First RPM check ***********"
if rpm -qa|grep postfix
 then
 {
  echo "Write down your domain name"
  read "l"
  echo "write down your hostname"
  read "h"
  echo "write down your network like 192.168.1.0/24"
  read "n"
  echo ""
  echo '
  inet_interfaces = all
  myhostname = '$h'
  myorigin = '$l'
  mydomain = '$l'
  mydestination = $myhostname, $mydomain, $myorigin
  relayhost = [smtp.'$l']
  mynetworks = '$n' 127.0.0.0/8
  ' > /etc/postfix/main.cf


  #************************
  echo "which one u use ?"
  echo "  1: Squirrel"
  echo "  2: Open Webmail"
  echo "  3: Other"
  read a
  if [ $a -eq 1 ]
    then 
    {
     echo "home_mailbox = Mailbox" >>/etc/postfix/main.cf
    }
  elif [ $a -eq 2 ]
    then
    {
     echo "#home_mailbox = !default" >>/etc/postfix/main.cf
    }
  else
    {
     echo "home_mailbox = Maildir">>/etc/postfix/main.cf
    }
  fi
  echo ""
  clear
  echo ""
  echo ""
  service postfix restart
  echo ""
  echo "************************************************************"
  echo "*    Postfix configuration has been completed              *"
  echo "*                   Enjoy It                               *"
  echo "************************************************************"
 }
else 
 {
 clear
 echo ""
 echo ""
 echo "  *************************************************************"
 echo "  *          No rpm installed for postfix                     *"
 echo "  *          Please install the rpm first                     *"
 echo "  *************************************************************"
 }
fi
echo "******  Do u want to configure dovecot ?  **********************"
echo "  1 > press 1 for yes"
echo "  2 > press 2 for no "
echo ""
read a
if [ $a -eq 1 ]
 then
  {
   ./dovecot.sh
  }
else 
 echo "***** Ok Dovecot is not configured *******"
fi
 

DNS server configuration by shell scripting

******************************************************
Just copy the content and save it to dns.sh file. set permission like
******************************************************    
     # chmod 777 dns.sh
     #./dns.sh
*******************************************************

echo "write down the domain name"
read "l"

echo "write down the iP address blockwise"
echo "First Block:"
read "i1"
echo "Second Block"
read "i2"
echo "Third Block"
read "i3"
echo "Fourth Block"
read "i4"
echo "Write down Subnet Mask"
read "s"
sleep 1

echo "*****************************************************************"
echo "*     '$i1'.'$i2'.'$i3'.'$i4'                     *"
echo "*                   '$s'                                        *"
echo "* ***************************************************************"
echo ""
echo "" 
echo "write down the host name"

read "h"
echo ""
hostname $h
echo 'hostname'
hostname
hostname 
echo > /etc/resolv.conf '
search '$l'
nameserver '$i1'.'$i2'.'$i3'.'$i4''
echo > /etc/sysconfig/network-scripts/ifcfg-eth0 '
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR='$i1'.'$i2'.'$i3'.'$i4'
NETMASK='$S'
'


service network restart

echo > /etc/sysconfig/network '
NETWORKING=yes
HOSTNAME='$h''

#echo >> /etc/resolv.conf '
#nameserver '$i1'.'$i2'.'$i3'.'$i4''

echo > /etc/named.conf '

options {
 listen-on port 53 { 127.0.0.1; '$i1'.'$i2'.'$i3'.'$i4'; };
 listen-on-v6 port 53 { ::1; };
 directory  "/var/named";
 dump-file  "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
// allow-query     { localhost; };
 recursion yes;

 dnssec-enable yes;
 dnssec-validation yes;
 dnssec-lookaside auto;

 bindkeys-file "/etc/named.iscdlv.key";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "'$l'" IN {
 type master;
 file "'$l'.for";
 allow-update { none; };
};

zone "'$i3'.'$i2'.'$i1'.in-addr.arpa" IN {
 type master;
 file "'$l'.rev";
 allow-update { none; };
};
'

touch /var/named/$l.for

touch /var/named/$l.rev

echo "***************************************************************"

echo > /var/named/$l.for '
$TTL 1D
@    IN SOA '$h'.'$l'. root.'$l'. (
     0  ; serial)
     1D  ; refresh
     1H  ; retry
     1W  ; expiry
     3H )  ; minimum

         IN NS '$h'.'$l'.
'$h'  IN A '$i1'.'$i2'.'$i3'.'$i4'
www.'$l'. IN A '$i1'.'$i2'.'$i3'.'$i4''

sleep 1
echo "****************************************************************"

echo ""
echo ""

echo > /var/named/$l.rev '
$TTL 1D
@       IN      SOA     '$h'.'$l'. root.'$l'.  (
                                      0          ; Serial
                                      1D         ; Refresh
                                      1H         ; Retry
                                      1W         ; Expire
                                      3H  )      ; Minimum
              IN      NS      '$h'.'$l'.

'$i4'       IN      PTR     '$h'.'$l'. '
echo ""
killall named
echo ""
echo "*****************************************************************"
service named start
echo ""
echo ""
chown root.named /var/named/$l.for
chown root.named /var/named/$l.rev

echo "******************************************************************"
ping www.$l -c 4
echo "******************************************************************"
clear

echo ""
echo ""
echo "**************************************************************"
echo "*      DNS Server Configuration has been Completed           *"
echo "*      Please Check Your Configuration by nslookup command   *"
echo "**************************************************************"
echo ""

Script for finding a file and copy to a Specific directory

#!/bin/bash
# Script for finding a file and copy to a Specific directory
read -p "write the name of file: " a

file=`find / -name $a`
if [ $? -eq 0 ]
then
 {
  echo "*********************"
  echo "* $a File found which u r looking for     *"
  echo "*********************"
  read -p " where do u want to copy it: " b
  cp $file $b
}
else
 echo "file not found"
fi

###########################################
IF we find  More than one  files then we can use this script
###########################################
#!/bin/bash
 read -p "write down the file name : " file
find / -name $file>/shell/find
grep $file /shell/find
if [ $? -eq 0 ]
   then
  {
    valfile=`cat /shell/find`
    line=`sed -n 2p /shell/find`
    if [ ! -z "$line" ]
      then
      {
       echo ""
       read -p "Hey !!! select to copy from above" c
       echo ""
       read -p "Place where to copy :" d
       cp $c $d
       echo ""
       echo "File Copied to $d"
       echo ""
      }
    else
      {
       echo ""
       read -p "Place where to copy :" f
       cp $valfile $f
       echo ""
       echo "File Copied to $f"
       echo ""
      }
    fi
  }
  else
    echo ""
    echo "File not exixt"
    echo ""
  fi

Adding a linux user by shell scripting

#!/bin/bash

if [ $(id -u) -eq 0 ]; then #checking you either root or normal user
    echo -n " write the username: "
    read  username          #Taking username from keyboard
    echo -n " write the Password: "
    read -s  password       #Taking password from keyboard
  
    #check the username in passwd file if exist and printing value to null
    grep "$username" /etc/passwd >/dev/null
  
    if [ $? -eq 0 ]; then
        echo "***************************"
        echo " $username already exist  *"
        echo "***************************"
        exit 1
    else
        pass=$(perl -e 'print crypt($ARGV[0], "password")' $password) #encrypting password
        useradd -m -p $pass $username
        [ $? -eq 0 ] && echo "User has been added to system!" || echo "Failed to add a user!"
    fi
else
    echo ""
    echo "**********************************************************"
    echo " U are not root. Only root may add a user to the system  *"
    echo "**********************************************************"
    exit 2
fi

Migrating Mail Server from old server to new server

Postfix Mail Server Migration from old server to new server
***************************************************
First of all we will archive all existing mail userid and password.

old_server: 192.168.1.76
#########################

export UGIDLIMIT=500
#create a folder where we will store all existing mail,userid and their password. 
mkdir -p /root/migrate
cd /root/migrate

awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/passwd > /root/passfile/passwd.mig
awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/group > /root/passfile/group.mig
awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534) {print $1}' /etc/passwd | tee - |egrep -f - /etc/shadow > /root/passfile/shadow.mig
cp /etc/gshadow /root/passfile/gshadow.mig

tar -zcvpf /root/migrate/home.tar.gz /home
tar -zcvpf /root/migrate/mail.tar.gz /var/spool/mail

##########################################

After that the migrate folder will be copied to New server. We will configure postfix in new server.

new_server: 192.168.1.98
#########################################


export UGIDLIMIT=500
mkdir -p /root/backup
cd /root/backup
scp 192.168.1.76:/root/migrate/* .
cat passwd.mig >> /etc/passwd
cat group.mig >> /etc/group
cat shadow.mig >> /etc/shadow
cp gshadow.mig /etc/gshadow
cd /
tar -zxvf /root/backup/home.tar.gz
tar -zxvf /root/backup/mail.tar.gz