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Need to create a simple script using MD5, SSH...

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Top Forums Shell Programming and Scripting Need to create a simple script using MD5, SSH...
# 29  
Old 03-08-2011
Well, if it's printing "ssh-ing to box rtidsva", it must be pulling that name from somewhere, so I think it really is executing those two programs and reading the names appropriately.

I assume this 'first' variable is to compare all following with the local host. Why not do that separately to avoid confusion and cut a big chunk of extra logic out?

Code:
#!/usr/bin/sh 
 
while read fname; do 
    bname=$(basename $fname) 
    echo "trying "${fname} (${bname})" >&2

    hash=$(/usr/local/bin/md5 /opt/dba/scp/$bname | awk '{print $4}')

    echo "local hash is ${hash}"

    /usr/local/bin/hosts | while read box ; do 
        echo "ssh-ing to box ${box}" >&2
        t=$(ssh ${box} "/usr/local/bin/md5 /opt/dba/scp/$bname" | awk '{print $4}') 
        echo "comparing ${hash} to ${t}" >&2
        [ "${hash}" = "${t}" ] || echo "Files are not Identical!!!"
    done 
done < /home/izivanov/iz3

When in doubt, print everything. Smilie
# 30  
Old 03-08-2011
Okay we got something!

HTML Code:
(root):/home/izivanov# sh dirsync5.sh
trying /opt/dba/scp/xxxxxxxxx (xxxxxxxxc)
local hash is xxxxxxxxxxxxxxxxxx
ssh-ing to box box2
comparing xxxxxxxxxxxxxxxxxxxxx to xxxxxxxxxxxxxxxxxxxxxxxx
~
~
~
~
Question why is it only ssh-ing into box 2?
Last edited by zixzix01; 03-09-2011 at 06:00 PM..
# 31  
Old 03-08-2011
Check what /usr/local/bin/hosts prints. That loop won't break until read fails for some reason. Try running /usr/local/bin/hosts by itself and see what it does.

You can't md5sum things like /etc/sudoers without root access. And automatic passwordless remote root access to every machine is scary, so maybe you don't want to check that one... That weird 'opened' must be part of an error message -- odd place for it to end up, I'd have expected them to go to stderr!

But we're getting there. It's definitely able to verify some files now.
This User Gave Thanks to Corona688 For This Post:
zixzix01
# 32  
Old 03-09-2011
Btw I am running with root access. I didn't need to provide my login info to ssh with the script before to do this check either.

Its executable from anywhere with just "hosts" line. If I run it from Box 1 from which we make all our changes from, I get a list of all the boxes:

box 1(root):/home/izivanov# hosts
box 2
box 3
box4
~
~
~
box n
And if I run it from box 2, I'll get:

box 1
box3
box4
~
~
~
Box n

Do you understand?


So running the script from box 1, its getting only the first line of `hosts`, i.e. Box 2, and then not checking the file in question against that box either!

We also include `hostname' executable so that it would do this check on every box including the one I'm currently on, box 1! But it's not doing that!
Last edited by zixzix01; 03-09-2011 at 10:42 AM.. Reason: Forgot to add something!
# 33  
Old 03-09-2011
I really don't understand why it's not looping through all hosts... When loops break down like that, simplify it until you get something that works as expected and build from there.
Code:
while read fname; do 
    bname=$(basename $fname) 
    echo "trying "${fname} (${bname})" >&2

    hash=$(/usr/local/bin/md5 /opt/dba/scp/$bname | awk '{print $4}')

    echo "local hash is ${hash}"

    # should just print the entire list of hosts repeatedly
    /usr/local/bin/hosts

done < /home/izivanov/iz3

# 34  
Old 03-09-2011
Yup its exactly what happened!

It displayed the local hash, and then listed all of the servers. However I don't even need the see the hash. I just need to display on which server the hash doesn't correspond to the original file hash!

---------- Post updated at 12:35 PM ---------- Previous update was at 12:32 PM ----------

Sorry here is the output also:

(root):/home/izivanov# sh dirsync6.sh
trying /opt/dba/scp/xxxxxxxxxxx (xxxxxxx)
local hash is xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Box 2
box 3
~~~
etc

and then it repeats for all the files the same!
Last edited by zixzix01; 03-09-2011 at 06:00 PM..
# 35  
Old 03-09-2011
building from there:
Code:
while read fname; do 
    bname=$(basename $fname) 
    echo "trying "${fname} (${bname})" >&2

    hash=$(/usr/local/bin/md5 /opt/dba/scp/$bname | awk '{print $4}')

    echo "local hash is ${hash}"

    # should just print the md5's
    /usr/local/bin/hosts | while read box
    do
        # should print md5's repeatedly
        ssh ${box} "/usr/local/bin/md5" "/opt/dba/scp/$bname"
    done

done < /home/izivanov/iz3

---------- Post updated at 11:45 AM ---------- Previous update was at 11:41 AM ----------

...and if that works
Code:
while read fname; do 
    bname=$(basename $fname) 
    echo "trying "${fname} (${bname})" >&2

    hash=$(/usr/local/bin/md5 /opt/dba/scp/$bname | awk '{print $4}')

    echo "local hash is ${hash}"

    # should just print the md5's
    /usr/local/bin/hosts | while read box
    do
        # should print md5's repeatedly
        T=$(ssh ${box} "/usr/local/bin/md5" "/opt/dba/scp/$bname" | awk '{ print $4;}')
        [ "$T" = "$hash" ] || echo "${box} bname differs!"
    done

done < /home/izivanov/iz3

I just realized something. Not all the files you want to test are under /opt/dba/scp, are they? Not if you want to check /etc/sudoers!
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