#!/bin/sh

LOGFILE="/var/log/add_vsftpd.log"
LOGERR="/var/log/add_vsftpd-error.log"
GREP=$(which grep)
ECHO=$(which echo)
USERADD=$(which useradd)
SYSTEMCTL=$(which systemctl 2> /dev/null)
CAT=$(which cat)
MAILADDR=""
FTPUID=3199
FTPUIDMIN=3150
ERROR=0

#Check OS Version
function f_checkOS ()
{
OS=$($GREP -i "VERSION" /etc/SuSE-release |cut -d " " -f3)

if [ "${OS}" -eq "11" ]
then
   #$ECHO "Operating System = SLES$OS"
   OFFVSFTPD=$(chkconfig vsftpd |cut -d " " -f3)
   if [ "${OFFVSFTPD}" == "off" ]
   then
      $ECHO "add vsftpd to autostart"
      /sbin/chkconfig vsftpd xinetd
   OFFXINETD=$(/sbin/chkconfig xinetd |cut -d " " -f3)
   fi
   if [ "${OFFXINETD}" == "off" ]
   then
      $ECHO "add xinetd to autostart"
      /sbin/chkconfig xinetd on
      $ECHO "start xinetd"
      /sbin/service xinetd restart
        else
                $ECHO "start xinetd"
                /sbin/service xinetd restart
   fi
else
   #Check vsftpd enabled via xinetd
   $GREP -i disable /etc/xinetd.d/vsftpd | $GREP -iq "^#"
   T1=$?
   if [ "${T1}" -ne "0" ] ;
   then
      $ECHO "enabling vsftpd"
      sed -i '/disable/s|^|#|' /etc/xinetd.d/vsftpd
   #else
      #$ECHO "vsftpd is already enabled - nothing to do"
        fi
   XINETDSTAT=$(systemctl is-enabled xinetd.service)
   if [ "${XINETDSTAT}" = "disabled" ]
   then
      #$ECHO "add xinetd to autostart"
      $SYSTEMCTL enable xinetd.service
      $ECHO "start xinetd"
      $SYSTEMCTL restart xinetd.service
   else
      $ECHO "restart xinetd"
      $SYSTEMCTL restart xinetd.service
   fi
fi
}

function f_readftpinfos ()
{
#Useradd
read -p "Please enter the Ticketnumber: " TNUMBER
$ECHO "Ticketnumber \"$TNUMBER\" added!"
$ECHO ""

read -p "Please enter FTP-Username: " FTPUSER
$ECHO "FTP-Username \"$FTPUSER\" added!"
$ECHO ""

read -p "Please enter FTP-Userpassword: " FTPPW
$ECHO "FTP-Userpassword \"$FTPPW\" added!"
$ECHO ""

read -p "Please enter FTP-Userdescription: " FTPCOMMENT
$ECHO "FTP-Userdescription \"$FTPCOMMENT\" added!"
$ECHO ""

read -p "Please enter FTP-Path (example: /usr/sap/interfaces/abc/cdf): " FTPPATH
$ECHO "FTP-Path \"$FTPPATH\" added!"
$ECHO ""

read -p "Please enter Groupname (default-group: sapsys): " GROUPNAME
GROUPNAME=${GROUPNAME:-sapsys}
$ECHO "Groupname \"$GROUPNAME\" added!"
$ECHO ""

read -p "Please enter Emailadress: " MAILADDR
$ECHO "Emailadress \"$MAILADDR\" added!"
$ECHO ""

FIRSTNAME=$(echo ${MAILADDR^} | cut -d "." -f1)
}

#Add user to ftp-config
function f_ftpserviceadd ()
{
$ECHO "$FTPUSER" >> /etc/vsftpd.users
}

function f_searchfreeUID ()
{

CHECK="true"
while [ "$CHECK" == "true" ]
do
        T2=$($CAT /etc/passwd | /usr/bin/cut -d ":" -f3 | $GREP $FTPUID)
        if [ -z ${T2} ] ;
        then
                        #$ECHO "Freie UID \"${FTPUID}\" gefunden"
                        CHECK="false"
                else
                                FTPUID=`expr $FTPUID - 1`
                        if [ "$FTPUID" -eq "$FTPUIDMIN" ];
                        then
                                $ECHO "Min UID \"${FTPUIDMIN}\" reached! Please contact COM-Support."
                                CHECK="false"
                        #else
                                #$ECHO "Naechste freie UID \"$FTPUID\" gefunden"
                        fi
        fi
done

}

function f_addftpaccount ()
{
ERROR=$($USERADD -d "$FTPPATH" -u "$FTPUID" -g "$GROUPNAME" -s /bin/false -c "$FTPCOMMENT" -m -p $(openssl passwd -1 "$FTPPW") "$FTPUSER" 3>&2 2>&1 1>&3)
T3=$?
if [ "${T3}" -ne "0" ] ;
then
$ECHO "FTP-User "$FTPUSER" not added. Please contact COM-Support!"
else
$ECHO "FTP-User "$FTPUSER" added"
fi
}

function f_logandmail ()
{
if [ "${T3}" -ne "0" ] ;
then

$ECHO "FTP Useradd - ERRORS REPORTED!" | mail -s "FTP Useradd - ERRORS REPORTED!" -S "smtp=x.x.x.x" "${MAILADDR}" -r "${MAILADDR}"

$ECHO "------------------------------------------------------------------------" >> ${LOGERR}
$ECHO "$ERROR" >> ${LOGERR}
$ECHO "Ticketnumber "$TNUMBER" executed as user $USER at `date +%H:%M_%d.%m.%y`" >> ${LOGERR}
$ECHO "FTP-User "$FTPUSER" not added. Please contact Support!" >> ${LOGERR}
$ECHO "------------------------------------------------------------------------" >> ${LOGERR}

else

$CAT <<EOF | mail -s "FTP Useradd Information" -S "smtp=x.x.x.x" "${MAILADDR}" -r "${MAILADDR}"

Some text...

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

Ticketnummer:                   $TNUMBER
FTP-Username:                   $FTPUSER
FTP-Password:                   $FTPPW
FTP-Pfad:                       $FTPPATH

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

Some more text...
EOF

$ECHO "------------------------------------------------------------------------" >> ${LOGFILE}
$ECHO "Ticketnumber "$TNUMBER" executed as user $USER at `date +%H:%M_%d.%m.%y`" >> ${LOGFILE}
$ECHO "FTP-Username:    $FTPUSER" >> ${LOGFILE}
$ECHO "FTP-Pfad:        $FTPPATH" >> ${LOGFILE}
$ECHO "------------------------------------------------------------------------" >> ${LOGFILE}

fi

}

f_readftpinfos
f_searchfreeUID
f_addftpaccount
f_ftpserviceadd
f_checkOS
f_logandmail