[asterisk-users] Script to automatically update externip. Useful for a host with dynamic public IP

[John Cahill]

Note: You'll probably have to change /etc/asterisk/sip_general_custom.conf to /etc/asterisk/sip.conf in the script depending on your set-up.


----- Original Message -----
From: "John Cahill" <john at dmcip.com>
To: "Asterisk Users Mailing" <asterisk-users at lists.digium.com>
Sent: Monday, 6 February, 2012 3:31:23 PM
Subject: [asterisk-users] Script to automatically update externip. Useful for a host with dynamic public IP

#!/bin/bash
# checksetexternip.sh
# Author: John Cahill email at johncahill.net
# Licence: GPL v3
# Description: script that queries checkip.dyndns.com to find the
server's external IP address. Updates asterisk's externip value and does
a sip reload if necessary.
# Last modified 06/02/2012

is_ip(){

input=$1
octet1=$(echo $input | cut -d "." -f1)
octet2=$(echo $input | cut -d "." -f2)
octet3=$(echo $input | cut -d "." -f3)
octet4=$(echo $input | cut -d "." -f4)
stat=1

if [[ $input =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]] && [
$octet1 -le 255 ] && [ $octet2 -le 255 ] && [ $octet3 -le 255 ] && [
$octet4 -le 255 ];
then stat=0
fi

return $stat

}

EXTERNIP=`wget -qO- checkip.dyndns.com | awk '{print $6}'| cut -d"<"
-f1` is_ip $EXTERNIP
if [ $? -ne 0 ]
then logger -s "checksetexternip.sh: External IP address invalid or
unavailable, exiting."
exit 1
fi

OLDEXTERNIP=`grep externip /etc/asterisk/sip_general_custom.conf | cut
-d"=" -f2`
if [ "$EXTERNIP" = "$OLDEXTERNIP" ]
then logger -s "checksetexternip.sh: External IP address is the same,
nothing to do exiting."
exit 0
else logger -s "checksetexternip.sh: External IP address has changed,
changing /etc/asterisk/sip_general_custom.conf"
grep -v "externip" /etc/asterisk/sip_general_custom.conf >
/etc/asterisk/sip_general_custom.conf.tmp echo "externip=$EXTERNIP" >>
/etc/asterisk/sip_general_custom.conf.tmp cp
/etc/asterisk/sip_general_custom.conf.tmp
/etc/asterisk/sip_general_custom.conf rm
/etc/asterisk/sip_general_custom.conf.tmp logger -s "Doing asterisk -rx
"sip reload""
asterisk -rx "sip reload"
fi

John Cahill

Systems Engineer

Services for Asterisk
Data Messaging & Communications Ltd
Fourth Floor
22 Lever St
Manchester M1 1EA

Email: john at dmcip.com
Telephone: 0800 862 0181
Fax: 0161 850 0126
jabber: gnujunk at jabber.org




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-- 
John Cahill 

Systems Engineer 

Services for Asterisk 
Data Messaging & Communications Ltd 
Fourth Floor 
22 Lever St 
Manchester 
M1 1EA 

Email: john at dmcip.com 
Telephone: 0800 862 0181 
Fax: 0161 850 0126 
jabber: gnujunk at jabber.org