GrandStream HT801/HT802 dynamic DNS autoupdater.

grandstream_ddns.sh

#!/bin/bash

EMAIL="you@example.com"
GS_HOSTNAME="your-grandstream-hostname"
STATUS_FILE='/tmp/.voip_ip_stat'

touch $STATUS_FILE

timeout 3 bash -c "printf '@' | telnet -e \@ $GS_HOSTNAME 22" 2>&1 >/dev/null
host_alive=$?

grep "gs_host_down" $STATUS_FILE 2>&1 >/dev/null
last_error_gs_down=$?

if [[ $host_alive != 0 && $last_error_gs_down != 0 ]];
then
  echo "[`date`] ERROR updating grandstream nat IP: unable to reach device"
  echo "gs_host_down" >$STATUS_FILE
  exit 1
fi

grep "gs_host_down_extended" $STATUS_FILE 2>&1 >/dev/null
gs_down_notice_sent=$?

if [[ $host_alive != 0 && $last_error_gs_down == 0 ]];
then
  echo "[`date`] ERROR updating grandstream nat IP: device unreachable for an extended time period"
  echo "gs_host_down_extended" >$STATUS_FILE

  if [[ $gs_down_notice_sent == 1 ]];
then
  echo "This is the VOIP management service at NOPE HQ.

The VOIP device at $GS_HOSTNAME has been unreachable for an extended period of time.

Please fix this issue at your earliest convenience.


Best regards,
NOPE Nanomachines


[generated: `hostname` `date`]
" | mailx -s 'NOPE VOIP Management Notice: Equipment Offline' $EMAIL
fi

  exit 1

fi

record_content=`curl -s http://whatismyip.akamai.com/`
fetch_succeeded=$?

if [[ $fetch_succeeded != 0 ]];
then
        echo "[`date`] ERROR updating grandstream nat IP: unable to fetch WAN IP ($record_content)"
        echo "ipcheck_wan_fail" >$STATUS_FILE
	exit 1
fi

current_ip=`printf "config\nget 101\nexit\nexit" | sshpass -f /home/jobs/scripts/gspw ssh admin@$GS_HOSTNAME 2>/dev/null | grep 101 | cut -d '=' -f2 | xargs`
fetch_succeeded=$?

if [[ $fetch_succeeded != 0 ]];
then
        echo "[`date`] ERROR updating grandstream nat IP: unable to fetch NAT IP from device ($current_ip)"
        echo "ipcheck_gs_fail" >$STATUS_FILE
        exit 1
fi

if [[ $record_content == $current_ip ]];
then
	echo "[`date`] OK updating grandstream nat IP: device setting matches detected value (gs:$current_ip, wan:$record_content)"
	rm -f $STATUS_FILE
	exit 0
fi

xaction=`printf "config\nset 101 $record_content\ncommit\nexit\nexit" | sshpass -f /home/jobs/scripts/gspw ssh admin@$GS_HOSTNAME 2>/dev/null`
update_succeeded=$?
updated_cfg_ip=`echo $xaction | grep 101 | cut -d '=' -f2 | xargs`

echo $xaction | grep 'Changes are commited.' >/dev/null
commit_successful=$?

if [[ $update_succeeded != 0 || $commit_successful != 0 ]];
then
	echo "[`date`] ERROR updating grandstream nat IP! $xaction (gs:$updated_cfg_ip wan:$record_content)"
	echo "gs_update_config_fail" >$STATUS_FILE
echo "This is the VOIP management service at NOPE HQ.

The automated NAT IP update job has failed for $GS_HOSTNAME.

Debugging information:

WAN IP: $record_content
Device IP record: $current_ip
Attepmpted update: $updated_cfg_ip
Transaction log: $xaction

Please fix this issue at your earliest convenience.


Best regards,
NOPE Nanomachines


[generated: `hostname` `date`]
" | mailx -s 'NOPE VOIP Management Notice: Job Failure' $EMAIL

	exit 1
else
	echo "[`date`] Successfully updated grandstream nat IP"
	rm -f $STATUS_FILE
	exit 0
fi