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Shell Script for Auto IP Change

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# 1  
Old 06-25-2014
Shell Script for Auto IP Change
Hi,

I am newbie to Linux/Asterisk. I am trying to write a shell script that would look for my SIP trunk registration, if found UNREACHABLE then it would execute a command and check my local IP, if my local IP is 192.168.1.106 then it would change the IP to 192.168.1.150 and vice versa, after that issue the commands, network service restart and amportal restart.

I have written following so far, and just by the looks, it seems wrong. Any help would be highly appreciated. Thanks

Code:
#!/bin/bash
asteriskbin=`which asterisk`
interval=10
ippath=/sbin/ifconfig
ip1=192.168.1.106
ip2=192.168.1.150
trunk="siptrunk"
run=true
while [[ "$run" == "true" ]]; do
checktrunk=`$asteriskbin -rx “sip show peer $trunk” | grep Status | grep -wc OK`
if [[ $checktrunk == 0 ]]; then
echo “TEST Trunk Down”
else
echo “SIP trunk registration OK.”
whatip=`$ippath eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}'
if [[ $whatip == $ip1 ]]; then 
ifconfig eth0 $ip2
else
ifconfig eth0 $ip1
network service restart
amportal restart
fi
sleep $interval
done
exit 1

# 2  
Old 06-25-2014
Any error messages? I can't really guess what exactly you are doing or intending here, so it's difficult to comment on the logic flow. There's a fi missing, maybe before network service restart. Some improvement opportunities, e.g. the grep/cut/awk pipes, jumped to my eye.
# 3  
Old 06-25-2014
As I said earlier, my trunks go offline (UNREACHABLE) every few days. The only work around is to have the local IP change and do a restart of asterisk service and network service. Changing the local IP is fine for me as all my clients connect through the VPN.

Any help would be appreciated. I havent executed the script as yet, as I know there are some syntax errors. Currently this is what I have.
Code:
#!/bin/bash
asteriskbin="which asterisk"
interval=10
ippath=/sbin/ifconfig

ip1=192.168.1.106
ip2=192.168.1.150

trunk="siptrunk"
run=true
while [[ "$run" == "true" ]]; do
    checktrunk="$asteriskbin -rx “sip show peer $trunk” | grep Status | grep -wc OK"
    if [[ $checktrunk == 0 ]]; then
    echo "TEST Trunk Down"
    else
    echo "SIP trunk registration OK."

whatip="$ippath eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}"

if [[ $whatip == $ip1 ]]; then 
    ifconfig eth0 $ip2
else
    ifconfig eth0 $ip1
    network service restart
    amportal restart

fi
    sleep $interval
done
#exit

Last edited by jeetz; 06-25-2014 at 03:22 PM..
# 4  
Old 06-25-2014
Again, there's a fi missing.
Do you want to restart the network only if changed to ip1, or in both cases changing to and fro?
Try
Code:
ifconfig eth0 |awk '/inet addr:/ {sub (/addr:/,"", $2); print $2}'

This User Gave Thanks to RudiC For This Post:
jeetz
# 5  
Old 06-25-2014
Hi Rudi,

Thanks for your help. I would like the network to be restarted and then Asterisk, in both cases where IP is chaned from ip1 to ip2 or ip2 to ip1. Should I try this?

Code:
ifconfig eth0 |awk '/inet addr:/ {sub (/addr:/,"", $2); print $2}'

# 6  
Old 06-25-2014
Yes. And check for the missing fi! Its position is crucial for your logics.
This User Gave Thanks to RudiC For This Post:
jeetz
# 7  
Old 06-25-2014
Thanks, sure I will add in the
Code:
fi

and will run the script tomorrow and share the results. Much appreciated!

Quote:
Originally Posted by RudiC
Yes. And check for the missing fi! Its position is crucial for your logics.
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