#!/bin/bash
# checksetexternip.sh
# Author: John Cahill [email protected]
# 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: [email protected]
Telephone: 0800 862 0181
Fax: 0161 850 0126
jabber: [email protected]
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