DNS updater, written in Windows Batch

dnsupdater.bat

:: Copyright (C) 2014  Jongmin Kim / kdzlvaids@gmail.com

:: This program is free software: you can redistribute it and/or modify
:: t under the terms of the GNU General Public License as published by
:: the Free Software Foundation, either version 3 of the License, or
:: (at your option) any later version.

:: This program is distributed in the hope that it will be useful,
:: but WITHOUT ANY WARRANTY; without even the implied warranty of
:: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
:: GNU General Public License for more details.

:: You should have received a copy of the GNU General Public License
:: along with this program.  If not, see <http://www.gnu.org/licenses/>.

:: Last edited at: Sun Nov  2 14:55:23 KST 2014
:: Last edited by: Jongmin Kim (kdzlvaids@gmail.com)

@ECHO OFF
GOTO :INIT

:INIT
SETLOCAL
ECHO Initialising...
CHCP 949 2>NUL
IF NOT ERRORLEVEL 1 GOTO :MAIN ELSE (
	SET "ERRCOM=Codepage 949 not available"
	SET "ERRFUS=1"
)
ECHO This system is not supported yet (%ERRCOM%)
ECHO Press any key to continue . . .
PAUSE >NUL
ENDLOCAL
EXIT /B 1

:MAIN
CLS
CALL :PROMPT01
ENDLOCAL
EXIT /B

:PROMPT01
netsh interface show interface
SET /P "PROMPT01=Interface name: "
GOTO :PROMPT02

:PROMPT02
CLS
ECHO.
IF "%PROMPT02_ERR%" EQU "1" (
	ECHO.
	ECHO Error: "%PROMPT02%" was not expected.
) ELSE (
	ECHO List of Public DNS Server
	ECHO Your interface name is: %PROMPT01%
)
netsh interface ip show dns
ECHO     [PROVIDER]         [PRIMATY]       [SECONDARY]     [COMMENT]
ECHO 1   KT DNS             168.126.63.1    168.126.63.2    kth Search Engine
ECHO 2   KT DNS             211.45.150.201  211.45.151.201
ECHO 3   SK Broadband       210.220.163.82  219.250.36.130
ECHO 4   LG U+              164.124.101.2   203.248.252.2
ECHO 5   Google Public DNS  8.8.8.8         8.8.4.4
ECHO 6   OPEN DNS           208.67.222.222  208.67.220.220
ECHO 7   Comodo Secure DNS  8.26.56.26      8.20.247.20
ECHO 8   Norton ConnectSafe 198.153.192.40  198.153.194.40  Security
ECHO 9   Norton ConnectSafe 198.153.192.50  198.153.194.50  Sec + Pornography
ECHO 10  Norton ConnectSafe 198.153.192.60  198.153.194.60  Sec + Porn + Family
ECHO.
SETLOCAL
SET /P "PROMPT02=Select connection number: "
IF "%PROMPT02%" EQU "1" (
	SET "IP01=168.126.63.1"
	SET "IP02=168.126.63.2"
) ELSE IF "%PROMPT02%" EQU "2" (
	SET "IP01=211.45.150.201 "
	SET "IP02=211.45.151.201"
) ELSE IF "%PROMPT02%" EQU "3" (
	SET "IP01=210.220.163.82"
	SET "IP02=219.250.36.130"
) ELSE IF "%PROMPT02%" EQU "4" (
	SET "IP01=164.124.101.2"
	SET "IP02=203.248.252.2"
) ELSE IF "%PROMPT02%" EQU "5" (
	SET "IP01=8.8.8.8"
	SET "IP02=8.8.4.4"
) ELSE IF "%PROMPT02%" EQU "6" (
	SET "IP01=208.67.222.222"
	SET "IP02=208.67.220.220"
) ELSE IF "%PROMPT02%" EQU "7" (
	SET "IP01=8.26.56.26"
	SET "IP02=8.20.247.20"
) ELSE IF "%PROMPT02%" EQU "8" (
	SET "IP01=198.153.192.40"
	SET "IP02=198.153.194.40"
) ELSE IF "%PROMPT02%" EQU "9" (
	SET "IP01=198.153.192.50"
	SET "IP02=198.153.194.50"
) ELSE IF "%PROMPT02%" EQU "10" (
	SET "IP01=198.153.192.60"
	SET "IP02=198.153.194.60"
) ELSE (
	ENDLOCAL
	SET "PROMPT02_ERR=1"
	GOTO :PROMPT02
)
CALL :DO_NETSH
ENDLOCAL
EXIT /B

:DO_NETSH
ECHO.
ECHO Your interface name is: %PROMPT01%
ECHO.
ECHO Purging old DNS settings . . .
netsh interface ip delete dns "%PROMPT01%" all
ECHO Setting primary DNS server to: %IP01% . . .
netsh interface ip add dns "%PROMPT01%" %IP01% index=1
ECHO Setting secondary DNS server to: %IP02% . . .
netsh interface ip add dns "%PROMPT01%" %IP02% index=2
ECHO Press any key to continue . . .
PAUSE >NUL
EXIT /B