Shell Programming and Scripting

Is there a basic IP range script or a site that has basic script written?

I am making a script that is looking for a device on my network threw HTTP://. I and using a for loop with wget to download the page and using grep to search the code for the serial number.

My range is 172.16.x.x/16 I only have up to 172.16.10.x so I will probably run it by /24 subnets. How can I run this and the for loop continues to the next IP?

Honestly, I have only taken a few scripting classes and trying to do it for misc things. I am really try to get this ability and if you guys have any pointers, it would be much appreciated.

Step 1: (Almost) check validity

Code:

$ echo "172.16.10.124" | grep -qE '172\.16\.10\.[0-9]{1,3}' ; echo $?
0
$ echo "172.16.10.abc" | grep -qE '172\.16\.10\.[0-9]{1,3}' ; echo $?
1

Note that this won't catch invalid addresses like '999.888.777.666'
Step 2: Try to ping

Code:

$ ping -c 3 -w 5 good_host >/dev/null 2>&1 ; echo $?
0
$ ping -c 3 -w 5 bad_host >/dev/null 2>&1 ; echo $?
1

Step 3: Check for an open port

Code:

$ netcat -z good_host 80 ; echo $?
0
$ netcat -z bad_host 80 ; echo $?
1

I'm sorry for not being clear on the range. I have networks from 172.16.1.1 - 172.16.10.254.

$ echo "172.16.10.124" | grep -qE '172\.16\.10\.[0-9]{1,3}' ; echo $?
0
$ echo "172.16.10.abc" | grep -qE '172\.16\.10\.[0-9]{1,3}' ; echo $?
1

RANGE=172.16.1.0/20

FOR i IN '$RANGE'
do
wget http://$i
mv --force index test
SN=`cat test | grep $1 | awk -F"<" '{print $4}' | awk -F">" '{print $2}'`

if [ "$1" = "$SN"]
then
`cat test > HA.GOTYA`
else
continue
fi
done

The script is something like that. But need to run this on a range of IPs. Am I going to have to do a ping test and put the good in to a file then having to get that file over to the script?

you just need to find a way to loop from 1 to 10, and then 1 to 254 eg if you have Python

Code:

#!/usr/bin/env python
import urllib2
for i in range(1,11):
    for j in range(1,255):
        sn="172.16.%d.%d" % (i,j)
        url="http://%s" % sn        
        page=urllib2.urlopen(url)
        result=page.read()
        if sn in result:
            open("HA.GOTYA","a").write(result)