#!/bin/bash
# -*-Shell-script-*-
# Author: Ceasar Sun <ceasar _at_ nchc org tw>
# License: GPL
# Version:	060728
# Function:	Run DRBL chnthn needed functions
# ChangeLog:	
#			* Please check ~/drbl/sbin/ocs-chnthn
##################################################

#
Perpare_Env(){
	echo -n "Checking fuse support... "
        # Since fuse is not always a module, we check /proc/filesystems
        if ! (grep -Eqw fuse /proc/filesystems) && !( modprobe fuse &> /dev/null ) ; then
	  echo -e "no\n** Can't find fuse support !"
          exit 1
        fi
	echo "yes"

	echo -n "Checking ntfs module... "
	!( modprobe ntfs &> /dev/null ) && echo -e "no\n**Can't load ntfs module , but it still can work normally... ."
	( modprobe ntfs &> /dev/null ) && echo "yes"
}
# Print usage
Usage(){
	echo "Usage:";
	echo " -b, --batch	batch mode"
	echo " -d, --device	assign the device, it can be partition or disk, e.g. /dev/sda, /dev/sdb, /dev/sda1 or /dev/sda3"
	echo " -i, --interact	interactive mode"
	echo " -o, --verbose	verbose mode"
	echo " -s, --show-hostname   Show the hostname only. Do not really modify in the registry file."
	echo " -p, --prefix		hostname prefix"
	echo " -n, --ntfsmount	assign ntfs mount prog , like: ntfsmount or ntfs-3g"
	echo " -R, --readme	Print readme information"
	echo " -S, --no_sync_config		Do not sync with DRBL-winRoll configuration, default is to sync"
	echo " -v, --variable		Hostname by what: [ IP | MAC | _fix]"
	echo " -w, --winroot	Assign windows root directory, like: windows (for XP, win 2003) or winNT (for Win2000, Win NT)"
	echo " -h, --help        print help page"
	echo "	"
	echo "Example:"
	echo "$0 -i	: Use interactive mode "
	echo "$0 -b -n ntfs-3g -v IP -p MyPC	: Assign hostname format like: MyPC-\$ip via using ntfs-3g tool in batch mode"
	echo "$0 -b -v _fix -p HOST_101 -S	: Assign fixed hostname 'HOST_101' and dotn't sync drbl-winRoll config in batch mode "
}

README(){

	cat << EOF

*
* Program:	ocs-chnthn
* Version:	$__VERSION 
* Author:	Ceasar Sun Chen-kai <ceasar@nchc.org.tw>
* License:	GPL
* Description: 	this script use Offline NT register editor tool: chntpw <http://home.eunet.no/pnordahl/ntpasswd/>
*			 to change Windows Hostname under drbl environment
* Usage:	ocs-chnthn.sh --help
* ChangeLog:	
*			* 060728	Synchronize with drbl-winRoll package configuration
*						Add new assignment method for fixed hostname
*						Select multi-partaion if available windows root as possible in batch mode
*						Fix ntfs module loading failed
*						Fix mount method for different file system
*						Fix umount first checking
*						Fix some bugs
*
*			* 060721	First version
*						Support using vfat FS as windows root file system
* Wish list:
*

EOF
}

# Print program header
PrintHeader(){
	echo "** ocs-chnthn: change the hostname of MS windows"
}

PrintFooter(){
	echo "*********************************************************"
	echo "*  NCHC Free Software Lab, NCHC, Taiwan "
	echo "*  License:	GPL "
	echo "*  Authors:	Ceasar Sun and Steven Shiau "
	echo "*  https://clonezilla.org, https://drbl.org"
	echo "*********************************************************"
}

Select_ntfsmount_prog(){
	local ntfsmount_prog=""
	for execprog
	do
		echo -n "Checking $execprog...    "
		!( command -v $execprog &> /dev/null ) && echo "no" ;
		( command -v $execprog &> /dev/null ) && echo "yes" && ntfsmount_prog=$execprog && break;
	done
	[ -z $ntfsmount_prog ] && echo "No ntfs mount prog, System aborted !!" && exit;
	NTFSMOUNTPROG=$ntfsmount_prog	
	echo "Use $NTFSMOUNTPROG."
}

Check_Package(){
	for execprog
	do
		# system aborted if the executing program don't exist in $PATH
		echo -n "Checking $execprog...    "
		!( command -v $execprog &> /dev/null ) && echo "No \"$execprog\" in ($PATH), System aborted !!" && exit;
		echo "yes"
	done 
}
#
# Print all hisk and partition info
Print_Allpartition_Info(){
  local dev_list=$@
  local idev
  local target_parts target_extended_parts part_fs partdev
  
  [ "$#" -eq 0 ] && [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING && echo "No hard drive? Aborted!" \
  && [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL && exit;
  
  [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING; echo '** Searching local file system in hard drive...'; [ "$BOOTUP" = "color" ] \
  && $SETCOLOR_NORMAL;
  
  PARTIDCOUNT=0
  i=0;j=0;k=0;

  for idev in $dev_list; do
    target_parts=""
    partdev=""
    if is_partition "$idev"; then 
      target_parts="$idev"
    else
      # Hard drive
      echo "Searching for data/extended partition(s) for modifying hostname..." | tee --append $OCS_LOGFILE
      part_rec_f="$(mktemp /tmp/part_rec_f.XXXXXX)"
      get_known_partition_proc_format $idev all $part_rec_f
      target_parts="$target_parts $(awk -F":" '/^data_dev:/ || /^extended_dev:/ {print $2}' $part_rec_f | sed -r -e "s|^[[:space:]]*||g")"
    fi
    # Strip the single white space which should be nothing.
    target_parts="$(echo $target_parts | sed -e "s/^  *$//")"
    if [ -n "$target_parts" ]; then
      echo "Available partitions to be modified for hostname: $target_parts" | tee --append $OCS_LOGFILE
    fi

    #partedhdinfo=`LC_ALL=C parted -s /dev/$idev print`
    #Str="/^[[:space:]]*[0-9]+/ && /(fat12|fat16|fat32|vfat)|(ntfs)/"
    #if is_partition "$idev"; then 
    #  part_infos=$( echo "$partedhdinfo" | LC_ALL=C awk "$Str { print \"/dev/$idev\\t\"\$2\"\t\"\$3\"\t\"\$4; }"  )
    #else
    #  part_infos=$( echo "$partedhdinfo" | LC_ALL=C awk "$Str { print \"/dev/$idev\"\$0; }"  )
    #fi 
    
    # partdev is the partition for fat or ntfs, its format is like: /dev/sda1 or /dev/nvme0n1p1
    echo -n "Finding devices containing MS Windows hostname... "
    for im in $target_parts; do
      part_fs="$(ocs-get-dev-info $im filesystem)"
      case "$part_fs" in
        fat12|fat16|fat32|vfat|ntfs) partdev="$partdev /dev/$im";;
      esac
    done

    i=0
    for part in $partdev; do
        echo -n "Partition $part... "
	i=$i+1;
	partfs=$()
	tmp_PARTDEVARR[$i]=$part
	tmp_PARTFSARR[$i]=$(ocs-get-dev-info $part filesystem)

	df $part  | grep $part &> /dev/null
	# Unmount the mounted file system first.
	if [ $? -eq 0 ]; then
		echo -n "umount $tmpdev if necessary... "
		 umount $part  &> /dev/null
		 [ $? -eq 1 ] && [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING && echo "Umount device: $part failed...  " && [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL && exit 1;
		[ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING && echo -e " done\n" && [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL  
	fi 
	
    done
    tmp_PARTIDCOUNT=$i;

    # check if include windows root]
    j=0		# Sum the number of total disks
    for (( i=1; i<=$tmp_PARTIDCOUNT; i=i+1)); do
    	dev_winroot='';
    	#dev_winroot=$(check_if_winroot "${tmp_PARTDEVARR[$i]}" "${tmp_PARTFSARR[$i]}")
    
    	if [ "${tmp_PARTFSARR[$i]}"  = "ntfs" ] ; then
    		$NTFSMOUNTPROG ${tmp_PARTDEVARR[$i]} $tmpmount
    	elif [ -n "(echo "${tmp_PARTFSARR[$i]}" | grep -iE "fat")" ] ; then
    		mount -t auto ${tmp_PARTDEVARR[$i]} $tmpmount
    	else
    		echo "No support filesystem '$tmpfs' on $tmpdev !! "
    		return;
    	fi
    	#echo "mount $tmpdev $tmpmount... "

    	for test_root in $DEFAULT_WIN_ROOT ; do
    		_tmp_winroot=$(cd $tmpmount; ls -d */ | grep -i $test_root)
    		[ -z "$_tmp_winroot" ] && break
    		find_registry_realname "$tmpmount/$_tmp_winroot" "$WIN_SYSTEM_SAM" "$WIN_SOFTWARE_SAM"
    		if [ -n "$REAL_WIN_SYSTEM_SAM" ] && [ -n "$REAL_WIN_SOFTWARE_SAM" ] ; then	
    			j=$j+1;
    			k=$k+1;
    			PART_DEV_ARR[$k]=${tmp_PARTDEVARR[$i]};
    			PART_FS_ARR[$k]=${tmp_PARTFSARR[$i]};
    			PART_WINROOT_ARR[$k]=$_tmp_winroot
    			PART_WIN_SYSTEM_SAM[$k]=$REAL_WIN_SYSTEM_SAM
    			PART_WIN_SOFTWARE_SAM[$k]=$REAL_WIN_SOFTWARE_SAM

    		fi
    	done
    	umount $tmpmount
    done

    #if [ $j -gt 0 ]; then 
    #    echo "[/dev/$idev]"
    #    echo "======================================================"
    #    echo "$part_infos"
    #    echo "======================================================"
    #fi
    echo
    echo "======================================================"
  done

  PARTIDCOUNT=$k
  
  [ $PARTIDCOUNT -eq 0 ] && [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING && echo "No available partition for modifying hostname. Aborted." \
  && [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL && exit 1
  return 0;
}

gen_hn_stream() {
	local hn_fix=$1;tmp_hn_fix="" ;hn_prefix=$1; hn_vari=$2; 
	local hn_ip_fix_bits=$HN_VARI_BITS;

	[ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING  && echo "** Setup hostname prefix and variable:" && [ "$BOOTUP" = "color" ]  && $SETCOLOR_NORMAL;
	if [ "$ACTIVE_MODE" = "interact" ]; then
		echo "Select hostname  variable: [ip] ,[mac] or [fix] ? "
		echo "[0]: IP , as:PC-001-014"
		echo "[1]: MAC address , as:PC-DA2199"
		echo "[2]: Manual"
		read -p "[0]" tmp_hn_vari junk

		[ -z "$tmp_hn_vari" ] ||  [ "$tmp_hn_vari" !=  '0' -a  "$tmp_hn_vari" !=  '1'  -a  "$tmp_hn_vari" !=  '2'   ] && tmp_hn_vari=0;

		if [ "$tmp_hn_vari" =  '2' ]; then
			hn_vari='_fix'
			echo "Input your assigned hostname"
			read -p "[$hn_fix]" tmp_hn_fix junk
			[ -n "$(echo $tmp_hn_fix)" ] && hn_fix=$tmp_hn_fix
			echo "Use fixed hostname format: $hn_fix"
		else 
			[ "$tmp_hn_vari" =  '0' ] && hn_vari='IP';
			[ "$tmp_hn_vari" =  '1' ] && hn_vari='MAC';
			read -p "Input hostname  prefix , no space: [$hn_prefix]" tmp_hn_prefix junk
			[ -n "$(echo $tmp_hn_prefix)" ] && hn_prefix=$tmp_hn_prefix
			echo "Use hostname format: $hn_prefix-\$$hn_vari"
		fi
	fi 

	# Convert IP address to strings
	tmp_ip=$(ip addr | awk '/inet / && !/ lo/ { print $2 };' | cut -d'/' -f 1 |awk -F. '{print $1+1000"-"$2+1000"-"$3+1000"-"$4+1000 }' | sed -e 's/^1//' -e 's/\-1/-/g' | head -n 1)
	tmp_mac=$(ip link | awk '/ether/ { print $2 };' | sed -e 's/://g' | head -n 1)
	
	# Fix IP address digits
	[ "$hn_vari" = "IP" ] && hn_ip_fix_bits=`expr $HN_VARI_BITS +  $HN_VARI_BITS / 3 - 1`

	IP_stream=${tmp_ip:(-$hn_ip_fix_bits)}
	MAC_stream=${tmp_mac:(-$hn_ip_fix_bits)}
	HN_VARI_BITS=$hn_ip_fix_bits
	HN_FORMAT_PREFIX=$hn_prefix
	HN_FORMAT_VARI=$hn_vari

	if [ "$HN_FORMAT_VARI" = "IP" ] ; then
		WIN_HN="$HN_FORMAT_PREFIX"-"$IP_stream"
	elif [ "$HN_FORMAT_VARI" = "MAC" ]; then
		WIN_HN="$HN_FORMAT_PREFIX"-"$MAC_stream"
	else
		WIN_HN="$hn_fix"
	fi
	
	return
}

find_registry_realname(){

	local _search_path=$1 _win_system_sam=$2 _win_software_sam=$3 _dirname _filename;

	_dirname=$(dirname $_win_system_sam )
	_filename=$(basename $_win_system_sam )
	REAL_WIN_SYSTEM_SAM="$(find $_search_path -iname $_filename -type f 2>/dev/null | grep -i $_win_system_sam)"

	_dirname=$(dirname $_win_software_sam )
	_filename=$(basename $_win_software_sam )
	REAL_WIN_SOFTWARE_SAM="$(find $_search_path -iname $_filename -type f 2>/dev/null | grep -i $_win_software_sam)"

}


SYNC_DRBL_winroll_config(){

	# Check drbl-winroll setting 
	[ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING && echo -n "** Checking drbl-winroll configuration: " && [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL;
	if [ -w "$tmpmount/$DRBL_WINROLL_CONFIG" ] ; then
		#_Match_str="^HN_WSNAME_PARAM\ =[\s\S]*$"
		#_Replace_str="HN_WSNAME_PARAM\ =\ \/N:$HN_FORMAT_PREFIX-\\\$$HN_FORMAT_VARI\[$HN_VARI_BITS\+\]\t\t# generated by ocs-chnthn\n/g"
		 #perl -pi -e "s/$_Match_str/$_Replace_str/g" "$tmpmount/$DRBL_WINROLL_CONFIG"

		# Backup original data first.
		echo -e "\tBackup winroll.conf ... "
		cp -f "$tmpmount/$DRBL_WINROLL_CONFIG" "$tmpmount/$DRBL_WINROLL_CONFIG.ocs-chnthn.bak" &> /dev/null
		if [ "$HN_FORMAT_VARI" = "_fix" ] ; then
			 LC_ALL=C perl -pi -e "s/^HN_WSNAME_PARAM\ =[\s\S]*$/HN_WSNAME_PARAM\ =\ \/N:$WIN_HN\t\t# generated by ocs-chnthn\n/g" "$tmpmount/$DRBL_WINROLL_CONFIG";
		elif [ "$HN_FORMAT_VARI" = "MAC" -o "$HN_FORMAT_VARI" = "IP" ]; then
			 LC_ALL=C perl -pi -e "s/^HN_WSNAME_PARAM\ =[\s\S]*$/HN_WSNAME_PARAM\ =\ \/N:$HN_FORMAT_PREFIX-\\\$$HN_FORMAT_VARI\[$HN_VARI_BITS\+\]\t\t# generated by ocs-chnthn\n/g" "$tmpmount/$DRBL_WINROLL_CONFIG"
		else
			# impossible to reach this option
			[ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING && echo "** Error: impossible to the value of HN_FORMAT_VARI " && [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL;
		fi
		#cat "$tmpmount/$DRBL_WINROLL_CONFIG"
		[ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING && echo -e "** Done !!" && [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL;
	elif [ ! -f "$tmpmount/$DRBL_WINROLL_CONFIG" ]; then
		[ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING && echo "No drbl-winroll config file, skip..." && [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
	fi

	return
}
#
decide_regeditor() {
  if type reged >/dev/null 2>&1; then
    # Use the one from chntpw package. For those distributions come with chntpw package (debian, ubuntu, fedora...)
    regeditor="reged"
  elif type drbl-reged >/dev/null 2>&1; then
    # Package created by DRBL project. For those distributions come with no chntpw package (centos, opensuse...)
    regeditor="drbl-reged"
  else
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "Registry editor \"reged\" or \"drbl-reged\" not found!"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "Program terminated!" 
    return 1
  fi
} # end of decide_regeditor() {
#
Get_hostname_related_key() {
  local hive_file="$*"
  # rhostname and rcomputername are global variables
  related_key="HostName ComputerName"
  rhostname=""
  rcomputername=""
  for ih in $hive_file; do
    rhostname="$(LC_ALL=C grep -Ewio HostName $ih | uniq)"
    [ -n "$rhostname" ] && break
  done
  for ih in $hive_file; do
    rcomputername="$(LC_ALL=C grep -Ewio ComputerName $ih | uniq)"
    [ -n "$rcomputername" ] && break
  done
} # end of Get_hostname_related_key() {
#
Modify_Win_Reg() {
  # Hive path name was changed from Win10:
  # ControlSet001\\services\\Tcpip\\Parameters -> ControlSet001\\Services\\Tcpip\\Parameters (services -> Services)
  # Key name was changed from Win10:
  # Hostname -> HostName
  local hive_f="$1"
  local new_winhn="$2"
  local reg_tmp="$(mktemp /tmp/regtmp.XXXXXX)"
  local var_serv="Services"  # Try the WIN10 hive path first.
  if [ ! -w "$hive_f" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "File \"$hive_f\" does not exist or not writable in function Modify_Win_Reg!"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "Program terminated!" 
    return 1
  fi
  if [ -z "$new_winhn" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "No \"new_winhn\" was assigned in function Modify_Win_Reg!"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "Program terminated!"
    return 1
  fi
  # Part 1: for HostName, NV HostName
  # 1. Dump
  if [ "$verbose" = "on" ]; then
    echo "Dumping registry data from $hive_f..."
  fi
  $regeditor -x $hive_f HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\$var_serv\\Tcpip\\Parameters $reg_tmp >/dev/null
  if [ -z "$(grep -Ei "^\"HostName\"=" $reg_tmp)" ]; then
    # Older Windows, try "services" instead of "Services"
    var_serv="services"  # Switch to older windows hive path
    $regeditor -x $hive_f HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\$var_serv\\Tcpip\\Parameters $reg_tmp >/dev/null
    if [ -z "$(grep -Ei "^\"HostName\"=" $reg_tmp)" ]; then
      echo "No key HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\$var_serv\\Tcpip\\Parameters in hive file $hive_f."
      echo "Skip processing $hive_f!"
      return 1
    fi
  fi
  # Check if the reg is dumped successfully. The return code for reged is useless.
  if [ -n "$(grep -Ei "^\"HostName\"=" $reg_tmp)" ]; then
    # 2. Create the key file to be imported: HostName, NV HostName then Import
    # ====================
    # Windows Registry Editor Version 5.00
    #
    #[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters]
    #"HostName"="BIT"
    #"NV HostName"="BIT"
    # ====================
    Get_hostname_related_key $reg_tmp # get rhostname, rcomputername
    win_reg_ver_line="$(head -n 1 $reg_tmp)"
    rm -f $reg_tmp
    cat > $reg_tmp << EOF_REG
$win_reg_ver_line

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\\$var_serv\Tcpip\Parameters]
"$rhostname"="$new_winhn"
"NV $rhostname"="$new_winhn"
EOF_REG
    $regeditor -C -I $hive_f HKEY_LOCAL_MACHINE\\SYSTEM $reg_tmp >/dev/null
    # 3. dump to check
    rm -f $reg_tmp
    $regeditor -x $hive_f HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\$var_serv\\Tcpip\\Parameters $reg_tmp >/dev/null
    if [ "$verbose" = "on" ]; then
      echo "The result in registry file $hive_f for key HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\$var_serv\\Tcpip\\Parameters:"
      grep -Ewi "HostName" $reg_tmp
    fi
    if [ -n "$(grep -Ewi "HostName" $reg_tmp | grep -Ew "$new_winhn")" ]; then
      [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
      echo "Th new hostname \"$new_winhn\" has been set in MS Windows."
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    else
      [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
      echo "Failed to set new hostname \"$new_winhn\" in MS Windows."
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    fi
    rm -f $reg_tmp
  else
    echo "No key HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\$var_serv\\Tcpip\\Parameters in hive file $hive_f."
    echo "Skip processing $hive_f!"
    return 1
  fi

  # Part 2: for ComputerName
  # 1. Dump
  if [ "$verbose" = "on" ]; then
    echo "Dumping registry data from $hive_f..."
  fi
  $regeditor -x $hive_f HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\Control\\ComputerName\\ComputerName $reg_tmp >/dev/null
  # Check if the reg is dumped successfully. The return code for reged is useless.
  if [ -n "$(grep -Ei "^\"ComputerName\"=" $reg_tmp)" ]; then
    # 2. Modify key: ComputerName
    # ====================
    # Windows Registry Editor Version 5.00
    #
    # [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\ComputerName\ComputerName]
    # "ComputerName"="BIT"
    # ====================
    Get_hostname_related_key $reg_tmp # get rhostname, rcomputername
    win_reg_ver_line="$(head -n 1 $reg_tmp)"
    rm -f $reg_tmp
    cat > $reg_tmp << EOF_REG
$win_reg_ver_line

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\ComputerName\ComputerName]
"$rcomputername"="$new_winhn"
EOF_REG
    $regeditor -C -I $hive_f HKEY_LOCAL_MACHINE\\SYSTEM $reg_tmp >/dev/null
    # 3. dump to check
    rm -f $reg_tmp
    $regeditor -x $hive_f HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\Control\\ComputerName\\ComputerName $reg_tmp >/dev/null
    if [ "$verbose" = "on" ]; then
      echo "The result in registry file $hive_f for key HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\Control\\ComputerName\\ComputerName:"
      grep -Ew "ComputerName" $reg_tmp
    fi
    if [ -z "$(grep -Ew "ComputerName" $reg_tmp | grep -Ew "$new_winhn")" ]; then
      [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
      echo "Failed to set new ComputerName $new_winhn in MS Windows."
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    fi
    rm -f $reg_tmp
  else
    echo "No key HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\Control\\ComputerName\\ComputerName in hive file $hive_f."
    echo "Skip processing $hive_f!"
    return 1
  fi
} # end of Modify_Win_Reg
#
Show_Win_Hostname_in_Reg() {
  local hive_f="$1"
  local reg_tmp="$(mktemp /tmp/regtmp.XXXXXX)"
  if [ ! -w "$hive_f" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "File \"$hive_f\" does not exist or not writable in function Show_Win_Hostname_in_Reg!"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "Program terminated!" 
    return 1
  fi
  # Part 1: for HostName, NV HostName
  if [ "$verbose" = "on" ]; then
    echo "Dumping registry data from $hive_f..."
  fi
  $regeditor -x $hive_f HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\Services\\Tcpip\\Parameters $reg_tmp >/dev/null
  echo $msg_delimiter_star_line
  echo "The hostname in registry file $hive_f for key HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\Services\\Tcpip\\Parameters:"
  grep -Ewi "HostName" $reg_tmp
  rm -f $reg_tmp

  # Part 2: for ComputerName
  if [ "$verbose" = "on" ]; then
    echo "Dumping registry data from $hive_f..."
  fi
  $regeditor -x $hive_f HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\Control\\ComputerName\\ComputerName $reg_tmp >/dev/null
  $regeditor -x $hive_f HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\Control\\ComputerName\\ComputerName $reg_tmp >/dev/null
  echo "The ComputerName in registry file $hive_f for key HKEY_LOCAL_MACHINE\\SYSTEM ControlSet001\\Control\\ComputerName\\ComputerName:"
  grep -Ew "ComputerName" $reg_tmp
  echo $msg_delimiter_star_line
  rm -f $reg_tmp
} # end of Show_Win_Hostname_in_Reg