drbl 2.6.15-1 / usr / sbin / drbl-login-switch

#!/bin/bash
# Steven Shiau <steven _at_ nchc org tw>
# License: GPL
# Description: To set the login mode for DRBL clients

# Load DRBL setting and functions
DRBL_SCRIPT_PATH="${DRBL_SCRIPT_PATH:-/usr/share/drbl}"

. $DRBL_SCRIPT_PATH/sbin/drbl-conf-functions

#
PWD_NO_0_1_MSG="Note!!! To avoid confusion, these random password does NOT contain digit 0 (zero) and digit 1 (one)!!!"

#
usage() {
  echo "Switch the login mode for DRBL clients."
  echo "Usage: $0 [Options]"
  echo "Options:"
  language_help_prompt_by_idx_no
  echo "-a, --auto:   auto login for clients"
  echo "-g, --no-gen-ssi do NOT generate DRBL SSI template tarball."
  echo "-h, --host IP_ADDRESS:  set login mode ony for the host with IP_ADDRESS instead of all DRBL clients"
  echo "-n, --normal: normal login for clients"
  echo "-t, --timed:  timed login within time TIMED_LOGIN_TIME (sec)"
  echo "-p, --password_opt: the password option for auto and timed login."
  echo "-u, --no_nis_update:  do NOT run NIS update"
  echo "-v, --verbose:  verbose mode."
  echo "PASSWORD_OPT:"
  echo "If one digit, it's the length of randomly created password."
  echo "If more than one character, it's the password (i.e. if you enter \"drblclient\", then the password is \"drblclient\")."
  echo "If blank, it will be randomly generated with some (say:8) characters."
}

#
check_if_root

# Get the $GDM_CFG/$KDM_CFG filename
get_gdm_kdm_conf_filename

#
set_gdm_auto_login() {
  # To config these two parameters:
  # AutomaticLoginEnable=false/true
  # AutomaticLogin=
  local inode="$1"
  local iauto_login_id="$2"
  if [ ! -f "$inode/$GDM_CFG" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
    echo "GDM config in $inode NOT found, assume it's DRBL SSI mode!"  
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 1
  fi
  # disable other types login (timed login) if exists
  perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*TimedLoginEnable=.*/TimedLoginEnable=false/" $inode/$GDM_CFG
  perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*TimedLogin=.*/TimedLogin=/" $inode/$GDM_CFG
  perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*TimedLoginDelay=.*/TimedLoginDelay=/" $inode/$GDM_CFG

  # enable autologin
  lines="$(get_block_line_in_gdm_kdm daemon $inode/$GDM_CFG)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  chk_cmd="if ($begin_line..$end_line) {print}"
  if [ -n "$(perl -n -e "$chk_cmd" $inode/$GDM_CFG | grep -i "^AutomaticLoginEnable=")" ]; then
    sub_cmd="if ($begin_line..$end_line) {s/^AutomaticLoginEnable=.*/AutomaticLoginEnable=true/}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
  else
    # insert 1 blank line
    sub_cmd="if ($((end_line))..$((end_line))) {s/^(.*)$/\$1\n/gi}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
    # replace the one we want in the added blank line
    sub_cmd="if ($((end_line+1))..$((end_line+1))) {s/^$/AutomaticLoginEnable=true/gi}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
  fi
  # put the autologin id
  lines="$(get_block_line_in_gdm_kdm daemon $inode/$GDM_CFG)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  chk_cmd="if ($begin_line..$end_line) {print}"
  if [ -n "$(perl -n -e "$chk_cmd" $inode/$GDM_CFG | grep -i "^AutomaticLogin=")" ]; then
    sub_cmd="if ($begin_line..$end_line) {s/^AutomaticLogin=.*/AutomaticLogin=$iauto_login_id/}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
  else
    # insert 1 blank line
    sub_cmd="if ($((end_line))..$((end_line))) {s/^(.*)$/\$1\n/gi}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
    # replace the one we want in the added blank line
    sub_cmd="if ($((end_line+1))..$((end_line+1))) {s/^$/AutomaticLogin=$iauto_login_id/gi}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
  fi
} # end of set_gdm_auto_login
#
set_gdm_timed_login() {
  local inode="$1"
  local iauto_login_id="$2"
  local tlogin_time="$3"
  if [ ! -f $inode/$GDM_CFG ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
    echo "$inode/$GDM_CFG is NOT found!!! Assume it's DRBL SSI mode!"  
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 1
  fi
  # set the timed login time
  [ -z "$tlogin_time" ] && tlogin_time="$TIMED_GDM_TIME_DEFAULT"
  # disable other types login (auto login) if they exists
  perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*AutomaticLoginEnable=.*/AutomaticLoginEnable=false/" $inode/$GDM_CFG
  perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*AutomaticLogin=.*/AutomaticLogin=/" $inode/$GDM_CFG

  # enable timed login
  lines="$(get_block_line_in_gdm_kdm daemon $inode/$GDM_CFG)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  chk_cmd="if ($begin_line..$end_line) {print}"
  if [ -n "$(perl -n -e "$chk_cmd" $inode/$GDM_CFG | grep -i "^TimedLoginEnable=")" ]; then
    sub_cmd="if ($begin_line..$end_line) {s/^TimedLoginEnable=.*/TimedLoginEnable=true/}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
  else
    # insert 1 blank line
    sub_cmd="if ($((end_line))..$((end_line))) {s/^(.*)$/\$1\n/gi}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
    # replace the one we want in the added blank line
    sub_cmd="if ($((end_line+1))..$((end_line+1))) {s/^$/TimedLoginEnable=true/gi}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
  fi
  # put the timedlogin delay time
  lines="$(get_block_line_in_gdm_kdm daemon $inode/$GDM_CFG)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  chk_cmd="if ($begin_line..$end_line) {print}"
  if [ -n "$(perl -n -e "$chk_cmd" $inode/$GDM_CFG | grep -i "^TimedLoginDelay=")" ]; then
    sub_cmd="if ($begin_line..$end_line) {s/^TimedLoginDelay=.*/TimedLoginDelay=$tlogin_time/}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
  else
    # insert 1 blank line
    sub_cmd="if ($((end_line))..$((end_line))) {s/^(.*)$/\$1\n/gi}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
    # replace the one we want in the added blank line
    sub_cmd="if ($((end_line+1))..$((end_line+1))) {s/^$/TimedLoginDelay=$tlogin_time/gi}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
  fi
  # put the timedlogin id
  lines="$(get_block_line_in_gdm_kdm daemon $inode/$GDM_CFG)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  chk_cmd="if ($begin_line..$end_line) {print}"
  if [ -n "$(perl -n -e "$chk_cmd" $inode/$GDM_CFG | grep -i "^TimedLogin=")" ]; then
    sub_cmd="if ($begin_line..$end_line) {s/^TimedLogin=.*/TimedLogin=$iauto_login_id/}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
  else
    # insert 1 blank line
    sub_cmd="if ($((end_line))..$((end_line))) {s/^(.*)$/\$1\n/gi}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
    # replace the one we want in the added blank line
    sub_cmd="if ($((end_line+1))..$((end_line+1))) {s/^$/TimedLogin=$iauto_login_id/gi}"
    perl -pi -e "$sub_cmd" $inode/$GDM_CFG
  fi
} # end of set_gdm_timed_login
#
set_gdm_normal_login() {
    local inode="$1"
    if [ ! -f $inode/$GDM_CFG ]; then
      [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
      echo "$inode/$GDM_CFG is NOT found!!! Assume it's DRBL SSI mode!"  
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
      return 1
    fi
    # disable auto and timed login, then it will be normal login since this is the default setting.
    perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*AutomaticLoginEnable=.*/AutomaticLoginEnable=false/" $inode/$GDM_CFG
    perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*AutomaticLogin=.*/AutomaticLogin=/" $inode/$GDM_CFG
    perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*TimedLoginEnable=.*/TimedLoginEnable=false/" $inode/$GDM_CFG
    perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*TimedLogin=.*/TimedLogin=/" $inode/$GDM_CFG
    perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*TimedLoginDelay=.*/TimedLoginDelay=/" $inode/$GDM_CFG
} # end of set_gdm_normal_login
#
set_lightdm_auto_login() {
  # To config these two parameters:
  # autologin-user=<YOUR USER>
  # autologin-user-timeout=0
  local inode="$1"
  local iauto_login_id="$2"
  if [ ! -f "$inode/$LIGHTDM_CFG" -a \
         -d "$inode/etc/lightdm/lightdm.conf.d" ]; then
    # For Ubuntu 13.10, lightdm 1.8.4 has different initial configration file. 
    # "/etc/lightdm/lightdm.conf" does not exist in the initial installation. 
    # While it will exist when a user configures that in the GUI.
    # We create one here.
    echo "[SeatDefaults]" > $inode/$LIGHTDM_CFG
  fi
  if [ ! -f "$inode/$LIGHTDM_CFG" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
    echo "LightDM config in $inode NOT found, assume it's DRBL SSI mode!"  
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 1
  fi
  # disable other types login (timed login) if exists
  perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*autologin-user-timeout=.*/autologin-user-timeout=0/" $inode/$LIGHTDM_CFG

  # put the autologin id
  lines="$(get_block_line_in_gdm_kdm SeatDefaults $inode/$LIGHTDM_CFG)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  chk_cmd="if ($begin_line..$end_line) {print}"
  if [ -n "$(perl -n -e "$chk_cmd" $inode/$LIGHTDM_CFG | grep -i "^autologin-user=")" ]; then
    sub_cmd="if ($begin_line..$end_line) {s/^autologin-user=.*/autologin-user=$iauto_login_id/}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
  else
    # insert 1 blank line
    sub_cmd="if ($((end_line))..$((end_line))) {s/^(.*)$/\$1\n/gi}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
    # replace the one we want in the added blank line
    sub_cmd="if ($((end_line+1))..$((end_line+1))) {s/^$/autologin-user=$iauto_login_id/gi}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
  fi
} # end of set_lightdm_auto_login
#
set_lightdm_timed_login() {
  # //NOTE// Due to a bug, this /autologin-user-timeout=* actually won't work on Ubuntu 11.10 and 12.04.
  # Ref: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/902852
  local inode="$1"
  local iauto_login_id="$2"
  local tlogin_time="$3"
  if [ ! -f "$inode/$LIGHTDM_CFG" -a \
         -d "$inode/etc/lightdm/lightdm.conf.d" ]; then
    # For Ubuntu 13.10, lightdm 1.8.4 has different initial configration file. 
    # "/etc/lightdm/lightdm.conf" does not exist in the initial installation. 
    # While it will exist when a user configures that in the GUI.
    # We create one here.
    echo "[SeatDefaults]" > $inode/$LIGHTDM_CFG
  fi
  if [ ! -f $inode/$LIGHTDM_CFG ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
    echo "$inode/$LIGHTDM_CFG is NOT found!!! Assume it's DRBL SSI mode!"  
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 1
  fi
  # set the timed login time
  [ -z "$tlogin_time" ] && tlogin_time="$TIMED_LIGHTDM_TIME_DEFAULT"

  # put the timedlogin delay time
  lines="$(get_block_line_in_gdm_kdm SeatDefaults $inode/$LIGHTDM_CFG)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  chk_cmd="if ($begin_line..$end_line) {print}"
  if [ -n "$(perl -n -e "$chk_cmd" $inode/$LIGHTDM_CFG | grep -i "^autologin-user-timeout=")" ]; then
    sub_cmd="if ($begin_line..$end_line) {s/^autologin-user-timeout=.*/autologin-user-timeout=$tlogin_time/}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
  else
    # insert 1 blank line
    sub_cmd="if ($((end_line))..$((end_line))) {s/^(.*)$/\$1\n/gi}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
    # replace the one we want in the added blank line
    sub_cmd="if ($((end_line+1))..$((end_line+1))) {s/^$/autologin-user-timeout=$tlogin_time/gi}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
  fi
  # put the timedlogin id
  lines="$(get_block_line_in_gdm_kdm SeatDefaults $inode/$LIGHTDM_CFG)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  chk_cmd="if ($begin_line..$end_line) {print}"
  if [ -n "$(perl -n -e "$chk_cmd" $inode/$LIGHTDM_CFG | grep -i "^autologin-user=")" ]; then
    sub_cmd="if ($begin_line..$end_line) {s/^autologin-user=.*/autologin-user=$iauto_login_id/}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
  else
    # insert 1 blank line
    sub_cmd="if ($((end_line))..$((end_line))) {s/^(.*)$/\$1\n/gi}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
    # replace the one we want in the added blank line
    sub_cmd="if ($((end_line+1))..$((end_line+1))) {s/^$/autologin-user=$iauto_login_id/gi}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
  fi
  # Append greeter-show-manual-login=true
  tune_lightdm_manual_login $inode true
} # end of set_lightdm_timed_login
#
tune_lightdm_manual_login() {
  local inode="$1" # Path to $LIGHTDM_CFG
  local manual_login_mode="$2"  # true or false
  # To config greeter-show-manual-login=true
  if [ ! -f "$inode/$LIGHTDM_CFG" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
    echo "LightDM config in $inode NOT found, assume it's DRBL SSI mode!"  
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 1
  fi

  # put the greeter-show-manual-login 
  lines="$(get_block_line_in_gdm_kdm SeatDefaults $inode/$LIGHTDM_CFG)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  chk_cmd="if ($begin_line..$end_line) {print}"
  if [ -n "$(perl -n -e "$chk_cmd" $inode/$LIGHTDM_CFG | grep -i "^greeter-show-manual-login=")" ]; then
    sub_cmd="if ($begin_line..$end_line) {s/^greeter-show-manual-login=.*/greeter-show-manual-login=$manual_login_mode/}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
  else
    # insert 1 blank line
    sub_cmd="if ($((end_line))..$((end_line))) {s/^(.*)$/\$1\n/gi}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
    # replace the one we want in the added blank line
    sub_cmd="if ($((end_line+1))..$((end_line+1))) {s/^$/greeter-show-manual-login=$manual_login_mode/gi}"
    perl -pi -e "$sub_cmd" $inode/$LIGHTDM_CFG
  fi
} # end of tune_lightdm_manual_login
#
set_lightdm_normal_login() {
    local inode="$1"
    if [ ! -f "$inode/$LIGHTDM_CFG" -a \
           -d "$inode/etc/lightdm/lightdm.conf.d" ]; then
      # For Ubuntu 13.10, lightdm 1.8.4 has different initial configration file. 
      # "/etc/lightdm/lightdm.conf" does not exist in the initial installation. 
      # While it will exist when a user configures that in the GUI.
      # We create one here.
      echo "[SeatDefaults]" > $inode/$LIGHTDM_CFG
    fi
    if [ ! -f $inode/$LIGHTDM_CFG ]; then
      [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
      echo "$inode/$LIGHTDM_CFG is NOT found!!! Assume it's DRBL SSI mode!"  
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
      return 1
    fi
    # disable auto and timed login, then it will be normal login since this is the default setting.
    perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*autologin-user=.*/#autologin-user=/" $inode/$LIGHTDM_CFG
    perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*autologin-user-timeout=.*/#autologin-user-timeout=/" $inode/$LIGHTDM_CFG
    # Append greeter-show-manual-login=true
    tune_lightdm_manual_login $inode true
} # end of set_lightdm_normal_login
#
set_kdm_auto_login() {
    local inode="$1"
    if [ ! -f "$inode/$KDM_CFG" ]; then
      [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
      echo "KDM config in $inode NOT found!!! Assume it's DRBL SSI mode!"  
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
      return 1
    fi
    perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*AutoLoginEnable=.*/AutoLoginEnable=true/" $inode/$KDM_CFG
    perl -p -i -e "s/^[[:space:]]*#*[[:space:]]*AutoLoginUser=.*/AutoLoginUser=$auto_login_id/" $inode/$KDM_CFG
} # end of set_kdm_auto_login
#
create_autologin_account() {
    # $create_account, $auto_login_id and $echo_no_digit_0_1 are global variables
    local ihost="$1"
    local shell_opt
    get_autologin_account $ihost
    # auto_login_id is got from get_autologin_account
    [ -z "$auto_login_id" ] && echo "Unable to get $ip client's hostname! Skip this one!" && return 1
    if ! grep -q -E "^$auto_login_id:" /etc/passwd ; then
      # account $auto_login_id does not exists, create it.
      create_account=1
      # If /bin/bash is found, we try to se /bin/bash as default shell.
      shell_opt=""
      [ -e /bin/bash ] && shell_opt="-s /bin/bash"
      echo -n "Creating account $auto_login_id... "
      useradd -m $auto_login_id $shell_opt
    fi

    # set password when accounts are created (at that time the passwords are empty) or when password_opt is assigned
    if [ "$create_account" = "1" -o -n "$password_opt" ]; then
      # clean the old file
      clean_old_auto_login_id_passwd_file $AUTO_LOGIN_ID_PASSWD $auto_login_id
      # set the passwd
      set_client_autologin_passwd=1
      case "$password_opt" in
       [0-9]|"")
          echo -n "The password_opt is set as \"$password_opt\". " 
          # echo the message $PWD_NO_0_1_MSG in the file $AUTO_LOGIN_ID_PASSWD
          # if it does not exist.
          if [ -z "`grep $PWD_NO_0_1_MSG  $AUTO_LOGIN_ID_PASSWD 2>/dev/null`" ]; then
            [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
            echo $PWD_NO_0_1_MSG | tee -a $AUTO_LOGIN_ID_PASSWD
            [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
          fi
          echo_no_digit_0_1=1
          # get one digit, so it must be the length of password
          # or it's empty, we set it as $password_opt_default
          if [ -z "$password_opt" ]; then
            echo -n "You did NOT set the length of password, set it as $PASSWD_LENGTH_DEFAULT. " 
            password_opt="$PASSWD_LENGTH_DEFAULT"
          fi
          echo -n "Generating random password from password length $password_opt... " 
		  make_random_password $password_opt
		  passwd_now=$random_password
          echo "$auto_login_id:$passwd_now" | chpasswd
          ;;
       *)
          echo -n "Set password from input..." 
          passwd_now="$password_opt"
          echo "$auto_login_id:$passwd_now" | chpasswd
      esac  
      echo "$auto_login_id $passwd_now" >> $AUTO_LOGIN_ID_PASSWD
    fi
} # end of create_autologin_account
#
clean_old_auto_login_id_passwd_file() {
    local local_autologin_id_pwd_file="$1"
    local local_auto_login_id="$2"
    [ -z "$local_auto_login_id" ] && echo "Unable to get auto login id! Skip this one!" && return 1
    # rename the old file, local_auto_login_id is a tag so that we will rename it just onece, not for every accounts.
    if [ -f "$local_autologin_id_pwd_file" ]; then
      if grep -q -E "\<$local_auto_login_id\>" $local_autologin_id_pwd_file; then
     	[ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
	echo "An existing file \"$local_autologin_id_pwd_file\" is found. Rename it as \"$local_autologin_id_pwd_file.drblsave\""
        [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
	mv -f $local_autologin_id_pwd_file ${local_autologin_id_pwd_file}.drblsave
      fi
    fi
} # end of clean_old_auto_login_id_passwd_file
#
output_result_and_update_yp() {
  # $create_account, $no_nis_update and $set_client_autologin_passwd are global variables
  if [ "$set_client_autologin_passwd" = "1" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING 
    echo $msg_created_autologin_ID_passwd_file
    #echo $PWD_NO_0_1_MSG | tee -a $AUTO_LOGIN_ID_PASSWD
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    # update the NIS
    [ "$no_nis_update" != "on" ] && make -C /var/yp
  fi
} # end of output_result_and_update_yp
     
##############
###  MAIN  ###
##############
# set the flag for create account and echo prompt
# $create_account, $auto_login_id, $no_nis_update, $set_client_autologin_passwd and $echo_no_digit_0_1 are global variables
create_account=0
echo_no_digit_0_1=0
set_client_autologin_passwd=0

# If clonezilla box or drbl-ssi mode
[ -f /etc/drbl/drbl_deploy.conf ] && . /etc/drbl/drbl_deploy.conf
if [ "$clonezilla_mode" = "clonezilla_box_mode" -o "$drbl_mode" = "drbl_ssi_mode" ]; then
  gen_ssi="yes"
else
  gen_ssi="no"
fi
     
while [ $# -gt 0 ]; do
  case "$1" in
    -n|--normal)
		shift; login_dm_mode="normal_login"
                ;;
    -a|--auto)
		shift; login_dm_mode="auto_login"
                ;;
    -t|--timed)
		shift; login_dm_mode="timed_login"
                if [ -z "$(echo $1 |grep ^-.)" ]; then
                  # skip the -xx option, in case 
		  timed_login_time="$1"
		  shift
                fi
                ;;
    -l|--language)
		shift
                if [ -z "$(echo $1 |grep ^-.)" ]; then
                  # skip the -xx option, in case 
		  specified_lang="$1"
		  shift
                fi
		;;
    -h|--host)
		shift
                if [ -z "$(echo $1 |grep ^-.)" ]; then
                  # skip the -xx option, in case 
		  specified_host="$1"
		  shift
                fi
		;;
    -g|--no-gen-ssi)
		gen_ssi="no"
                shift;;
    -v|--verbose)
		shift; verbose="on"
                ;;
    -u|--no_nis_update)
		shift; no_nis_update="on"
                ;;
    -p|--password_opt)
		shift
                if [ -z "$(echo $1 |grep ^-.)" ]; then
                  # skip the -xx option, in case 
		  password_opt="$1"
		  shift
                fi
		;;
    -*)		echo "${0}: ${1}: invalid option" >&2
		usage >& 2
		exit 2 ;;
    *)		break ;;
  esac
done

#
ask_and_load_lang_set $specified_lang

# check if the mode is set or net 
[ -z "$login_dm_mode" ] && usage && exit 1

#
if [ -n "$specified_host" ]; then
 [ ! -d "$drblroot/$specified_host" ] && echo "Can NOT find DRBL client $specified_host (i.e. no $drblroot/$specified_host)! Assume it's DRBL SSI client."
 [ -n "$verbose" ] && echo "specified_host: $specified_host"
fi

# set the login option for GDM
 [ -n "$verbose" ] && echo -n "The GDM login option: $login_dm_mode..."

# set the host to be processed
# host_list is the IP address of client, like 192.168.1.1...
host_list=""
if [ -n "$specified_host" ]; then
   # set the host path
   host_list=$drblroot/$specified_host
else
   # withoud specified_host, it must be all clients, append each one to $host_list
   for ihost in `get-client-ip-list`; do
     host_list="$host_list $drblroot/$ihost"
   done
fi

RC=""
preferred="$(drbl-check-dm)"
RC=$?

[ $RC -eq 0 ] && echo "Display manager:\"$preferred\"..."

if [ -z "$preferred" ]; then
    echo "No display manager was found!"
    echo "Skip changing client's login mode of graphical interface."
    exit 3
fi

#
case "$preferred" in
   gdm*)
    for ihost in $host_list; do
     echo -n "Setting node `basename $ihost` as $login_dm_mode... "
     case "$login_dm_mode" in
       "auto_login"|"timed_login")
	  # create auto login account if necessary
	  create_autologin_account $ihost
	  # set the mode for $AUTO_LOGIN_ID_PASSWD as root access only
	  [ -f "$AUTO_LOGIN_ID_PASSWD" ] && chmod 600 $AUTO_LOGIN_ID_PASSWD
     	  case "$login_dm_mode" in
     	    "auto_login")
     	       set_gdm_auto_login $ihost $auto_login_id
     	       ;;
     	    "timed_login")
     	       set_gdm_timed_login $ihost $auto_login_id $timed_login_time
     	       ;;
     	  esac
     	  echo "done!"
          ;;
       "normal_login")
     	  set_gdm_normal_login $ihost
     	  echo "done!"
          ;;
     esac
    done
    # output result and update yp
    output_result_and_update_yp
    ;;
  kdm|mdkkdm)
    # No timed_login for KDE... only auto_login or nornam_login
    [ "$login_dm_mode" = "timed_login" ] && echo "No timed login for KDE... only auto login or normal login, so set it as auto login..."
    for ihost in $host_list; do
      echo -n "Setting node `basename $ihost` as $login_dm_mode... "
      case "$login_dm_mode" in
        "auto_login"|"timed_login")
          # create auto login account if necessary
          create_autologin_account $ihost
          # set the mode for $AUTO_LOGIN_ID_PASSWD as root access only
          [ -f "$AUTO_LOGIN_ID_PASSWD" ] && chmod 600 $AUTO_LOGIN_ID_PASSWD
          set_kdm_auto_login $ihost
          echo "done!"
          ;;
        "normal_login")
          [ -f "$ihost/$SYSCONF_PATH/autologin" ] && rm -f $ihost/$SYSCONF_PATH/autologin
          echo "done!"
          ;;
      esac
    done
    # output result and update yp
    output_result_and_update_yp
    ;;
  lightdm)
    for ihost in $host_list; do
     echo -n "Setting node `basename $ihost` as $login_dm_mode... "
     case "$login_dm_mode" in
       "auto_login"|"timed_login")
	  # create auto login account if necessary
	  create_autologin_account $ihost
	  # set the mode for $AUTO_LOGIN_ID_PASSWD as root access only
	  [ -f "$AUTO_LOGIN_ID_PASSWD" ] && chmod 600 $AUTO_LOGIN_ID_PASSWD
     	  case "$login_dm_mode" in
     	    "auto_login")
     	       set_lightdm_auto_login $ihost $auto_login_id
     	       ;;
     	    "timed_login")
     	       set_lightdm_timed_login $ihost $auto_login_id $timed_login_time
     	       ;;
     	  esac
     	  echo "done!"
          ;;
       "normal_login")
     	  set_lightdm_normal_login $ihost
     	  echo "done!"
          ;;
     esac
    done
    # output result and update yp
    output_result_and_update_yp
    ;;
  *)
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "Unknown display manager! This display manager \"$preferred\" is not supported by `basename $0`."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "$msg_program_stop"
    exit 1
    ;;
esac

#
if [ "$gen_ssi" = "yes" ]; then
  echo "-------------------------------------------------------"
  echo "Since some config files are modified in template client, creating template tarball for DRBL SSI..."
  drbl-gen-ssi-files
fi