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run a command based on ip octet

Posted on 2010-09-19
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I am creating an unattended install of windows 7 that can be used for two different locations. When the computer is booted for the first time I need to silently install one of two programs based on the location. I would like to do this by using a batch file that checks the second octet in the IP address (one location will have a 16 in the second octet and one will have a 17.
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Question by:USNHELPDESK
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LVL 3

Expert Comment

ID: 33713396
I'll happily knock you up a vbscript that does this.  Doing it as a batch could be ugly.
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LVL 66

Expert Comment

ID: 33713500
Really simple in batch as well, using the find command and errorlevels...
@echo off
setlocal
REM replace X below with the 1st octect.....
ipconfig | find /i "x.16"
if %errorlevel%==0 set subnet=16
ipconfig | find /i "x.17"
if %errorlevel%==0 set subnet=17

if %subnet%==16 "\\path\to\your\app.exe"
if %subnet%==17 "\\path\to\your\other\app.exe"

:end
endlocal
exit

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LVL 3

Expert Comment

ID: 33713526
neat solution :)
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LVL 43

Expert Comment

ID: 33714785
Or you can split it off into a field using my script from here:

echo off
for /f "tokens=2 delims=:" %%a in ('ipconfig ^|find "IP Address"') do call :process %%a & goto :next
:next
echo Subnet is %subnet% and host is %host%
set site=Unknown
if %network%==10 set site=SiteA
if %network%==20 set site=SiteB
if %network%==30 set site=SiteC
if %network%==40 set site=SiteD
if %subnet%==192.168.1 set site=SiteE
if %subnet%==128.127.1 set site=Dragon-IT

echo site is %site%

goto :Eof

:process
echo Found %1
for /f "tokens=1-4 delims=." %%a in ("%1") do (set subnet=%%a.%%b.%%c)&(set host=%%d)&(set network=%%c)

Steve
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LVL 43

Expert Comment

ID: 33714795
The "network" is set there as Octet 3, "Subnet" as 1.2.3 and host as octet 4.

You may or not have problems if computers have multiple IP's due to VPN etc. or IPv6 but that can be dealt with if needed, or go for the simpler "FIND" solution above.
Steve
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LVL 43

Expert Comment

ID: 33714803
The other way of course would be to put the computer into different OU or group in Active Directory etc. and use group policy to push the app. down?
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LVL 13

Accepted Solution

Ben Personick (Previously QCubed) earned 500 total points
ID: 33716888
try this:

@Echo Off

:: -- Set Constants --
::- Put the first octet here so we can match on it
SET "FirstOctet=192"
::- Enter your commands to match here
::- Leave this as-is
SET "MyIP=NOMATCH"

:: -- Find IP --
FOR /F "Tokens=*" %%I IN ('ipconfig.exe ^| find /i /v "IPv6" ^| find /i "IP" ^| find /i "Address" ^| find /i " %FirstOctet%."') DO SET "MyIP=%%I"
ECHO MyIP Is Now "%MyIP%"&IF /I "%MyIP%"=="NOMATCH" GOTO :End-Script
SET "MyIP=%MyIP:*: =%"
::- Set Command to run based off Second Octet:
FOR /F "Tokens=2 Delims=." %%O IN ("%MyIP%") DO CALL SET "CmdToRun=%%Cmd%%O%%"
::- Run the Command we've matched
ECHO Running "%CmdToRun%"
"%CmdToRun%"

::- End of Script
:End-Script
ECHO Script is Exiting!

0

LVL 43

Expert Comment

ID: 33716912
I misread earlier btw about which octet.  To get second you would change this line:

for /f "tokens=1-4 delims=." %%a in ("%1") do (set subnet=%%a.%%b.%%c)&(set host=%%d)&(set network=%%c)

to

for /f "tokens=1-4 delims=." %%a in ("%1") do (set subnet=%%a.%%b.%%c)&(set host=%%d)&(set network=%%b)

and then %network% would be your 16 or 17.

Steve
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LVL 13

Expert Comment

ID: 33717123
Please Note: (as it may not be apparent) that in my script I am setting your commands to be called CMD(second octet) ie "Cmd17" for a reason.

My script uses the fact that the commands are held in variables encoded with the octet they run for to very quickly call the correct command instead of having a large series of IF statements. ^^

Also I am weeding out ipv6 addresses, and matching the first octet in case more than one address exists on the host machine.
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LVL 43

Expert Comment

ID: 33717381
i suppose both techniques have their place depending upon the wider picture, i use the script to myself to determine whether on vpn or not and which of a handful of sites if not to decide which drives to map etc. And can easily do goto net%network% or call %site% etc. as needed

And so set the more general variables which can then be used in if / goto or whatever.
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LVL 13

Expert Comment

ID: 33717781
@Dragon,

Hey! =) Similarly I took mine from a script I wrote for someone to change a group of computer's IP addresses based off subnet (which I in turn took from a script I wrote to set the local administrator's account PW based off subnet.)

I only saw John's and that is not the greatest because he could be pulling wrong info depending on the host address of the machine (granted it's a rare occurrence)

I like yours it works very similarly to mine, however I'm not a fan of those huge set of IFs you have there they are unavoidable at times though however in this case it works well to store a few commands inn variables and avoid a set of IFs.

About your script though why not just set sites = to Subnets and forget it, or why not create a set of definitions similar to how I did the command?

Actually looking at your script it strikes me that for your purposes your code does more than it needs to.  May I please suggest a slight change for use in your scripting purposes, I left your If statements assuming you prefer them but check this method out:

(Also your GOTO :Next is so that you won;'t check anything except the first adapter correct? -- Just trying to see if I follow why it's been used exactly ^^)

@ECHO OFF
FOR /F "Tokens=2 Delims=:" %%a IN ('IPConfig.exe ^| FIND /I "IP" ^| FIND /I "Address" ^| FIND /I /V "IPv6" ') DO SET "Subnet=%%~na"&SET "Host=%%~xa"&GOTO Next

:Next
ECHO Subnet is "%Subnet%" and host is "%Host%"

SET "Site=Unknown"
IF /I "%Subnet%"==" x.y.10" SET "Site=SiteA"
IF /I "%Subnet%"==" x.y.20" SET "Site=SiteB"
IF /I "%Subnet%"==" x.y.30" SET "Site=SiteC"
IF /I "%Subnet%"==" x.y.40" SET "Site=SiteD"
IF /I "%Subnet%"==" 192.168.1" SET "Site=SiteE"
IF /I "%Subnet%"==" 128.127.1" SET "Site=Dragon-IT"

ECHO Site is "%Site%"

GOTO :EOF

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LVL 13

Expert Comment

ID: 33717800
@Dragon:

Also I am checking "IP" and "Address" as separate find statements because inn windows XP once IPv6 is added, and inn Windows Vista and Windows 7 the statements show as:

IPv4  IPv6 and are per adapter. so "IP Address" will not match anything, but "Address" will match two items.  since in OSs without IPv6 the line simply reads "IP Address" we can't catch for "IPv4 Address" because all newer systems woudl not match

SO  i catch for IP, then Address, then NOT IPv6.  whcih will properly ahandle this on all Windows OSs =)
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LVL 43

Expert Comment

ID: 33718072
fair enough.  is only a simplified version of one that was for a specific purpose with some example checks - I have it checking different octets for different purposes / customers.  Agreed the search needs amending for Win 7 though sadly few customers using it yet.  Also of course I imagine ipconfig output will change based on OS lanuage?

anyway watching 5 yr old do his soccer training at the mo. And had enough of typing on phone!
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Author Comment

ID: 33718265
Thank you every one. With my novice knowledge using batch files, I was able to use QCubed's solution flawlessly.
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LVL 13

Expert Comment

ID: 33718861
@Dragon ahh K cool if you actually need to check all octets then you do ^^ just thorugh I saw a neat exception to the rule on your script is all.

@UNHelpDesk Glad the script is working appropriately for you =)

~Q
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