Check if connection is up, if not send email to...

[blueeyedme]

Hi !

At work we have a seperate isdn connection to a remote server.
Every once in a while this isdn router goes down. What i would like to do is make a script that checks if ip adres : 172.25.20.2 is active (its a ftp connection) and if not it sends me a email that the connection is down.
When i ftp to 172.25.20.2, it makes a isdn connection true that router and from there it goes to the remote server over the isdn connection.

So a script that checks if this connection is up? anyone ?

Thanks !

 

[vgersh99]

something along these lines:
#--------------------------------------
#!/bin/ksh
MyUser='blueeyedme'
MyPassword='heresMyPassword'
MyEmailAddress='blueeyedme@myCompany.com'

ftp -n -v <<EOF
open 172.25.20.2
user ${MyUser} ${MyPassword}
ls
EOF

if [ $? -ne 0 ] ; then
mailx -s 'FTP connection DOWN' ${MyEmailAddress} < $(date)
fi; vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[blueeyedme]

Thanks vlad !!

can you tell me what 'if [ $? -ne 0 ] ;' exactly does ?

thanks !!!!!!!!

 

[vgersh99]

$? has the value of the 'return status' of the LAST ran command. vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[blueeyedme]

Vlad,

I am getting the following error after running it.

With the set -x command in the script i see it logging in and out and then at the end it says :

syntax error at line 14: `(' unexpected


Does this sound familiar to you ?

Jeroen

 

[vgersh99]

ooops.
change

mailx -s 'FTP connection DOWN' ${MyEmailAddress} < $(date)

TO

mailx -s &quot;$(date) - FTP connection DOWN&quot; ${MyEmailAddress} < /dev/null

make sure you're running this as ksh vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[blueeyedme]

Vlad,

I think the script works, the only thing is it doesnt send the email when its down. (tried this by entering a incorrect ip adres)

thanks !

jeroen

 

[art15t]

why not just ping it first?

if [ -z &quot;`ping 172.25.20.2 5|grep alive`&quot; ]
then
# the 5 is a five second timeout(increase or decrease to your liking)
mailx .......
else
# it's alive so let's proceed with the ftp
ftp.....
fi

 

[blueeyedme]

Well the script works.. only the email part doesnt.

I can see it log in and out.. and if i use a incorrect ip adress it gives a error no connection.

 

[vgersh99]

your mail/sendmail might be miss-configured.
try sending mail [with mailx] manually from the command line - see if it works. vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[art15t]

Try redirecting exec and exec2 to log with the script running set -vx and have a look at the execlog to see if there's anything obvious.

#! /bin/ksh

set -vx
exec >$EXECLOG
exec 2>$EXECLOG
EXECLOG=/tmp/execlog$$
SERVER=172.25.20.2
TOUT=5
USER=username
PASS=password
FILE=filetosend
MAILX=/usr/bin/mailx
GREP=/usr/bin/grep
PING/usr/sbin/ping
FTP=/usr/bin/ftp
MYMAIL=mail@address
DATESTAMP=`date +%d-%m-%Y&quot; &quot;%H:%M:%S`
SUBJECT=&quot;connection to '$SERVER' is down: $DATESTAMP&quot;


if [ -n &quot;`$PING $SERVER $TOUT|$GREP alive`&quot; ]
then
echo &quot;
user $USER $PASS
put $FILE
bye&quot;|$FTP -n $SERVER
else
echo &quot;\nfailed to reach '$SERVER'\n&quot; >/dev/tty
echo &quot;$SUBJECT\n&quot;|$MAILX -s &quot;ftp failure&quot; $MYMAIL
exit 1
fi

 

[Annihilannic]

You'll have to set EXECLOG before you try redirecting anything to it though. ;-) Annihilannic.

 

[blueeyedme]

This is my script so far :


set -x
#!/bin/ksh
MyUser='user'
MyPassword='pass'
MyEmailAddress='name@host'

ftp -n -v <<EOF
open 10.0.5.10
user ${MyUser} ${MyPassword}
ls
EOF

if [ $? -ne 0 ] ; then
mailx -s &quot;FTP connection DOWN&quot; $MyEmailAddress < /dev/null
fi;


The error i get when the connection is down :

Connection timeout

The thing is that it doesnt send me the email then. IT DOES send me a email when i use mailx at the prompt as following :


mailx -s &quot;FTP connection DOWN&quot; user@host < /dev/null


Can anybody help me ?

thanks,

Jeroen

 

[Annihilannic]

ftp apparently doesn't return an exit status.

Try redirecting the output of the FTP command by using this line:

[tt]ftp -nv > /tmp/ftp.out.$$ 2>&1 << EOF[/tt]

And change your if statement to read:

[tt]if grep ^230 /tmp/ftp.out.$$
then
continue
else
mailx -s &quot;FTP connection DOWN&quot; $MyEmailAddress < /dev/null
fi[/tt]
rm /tmp/ftp.out.$$

230 is the code returned by FTP for a successful login. Annihilannic.

 

[blueeyedme]

\u@\h[\w]> ./mk_ftpcheck.sh
MyUser=user
MyPassword=passwd
MyEmailAddress=user@host
MyLog=/var/opt/oracle/bene/log/ftp.out.$$ 2>&1
+ ftp -n -v
open 10.0.5.10
user user passwd
ls
+ grep
+ 230 /var/opt/oracle/bene/log/ftp.out.401
./mk_ftpcheck.sh: 230: not found
Usage: grep -hblcnsviw pattern file . . .
+ mailx -s FTP connection DOWN user@host

The script doesnt work anymore now. No matter if the site is up or down it keeps mailing me. With grep it says as above (./mk_ftpcheck.sh: 230: not found Usage: grep -hblcnsviw pattern file . . . )

Anybody ?
thanks !

 

[blueeyedme]

Its working now ! thanks everyone..

I had the logfile wrong. works WHOOHOOOO

 

[Annihilannic]

Good news!

Under sh you have to surround &quot;^230&quot; with quotes. For some reason the character '^' has special meaning to sh, but I can't see anything that says what that meaning is! Annihilannic.