Hi folks - using MIAB to host my personal domains and absolutely love it! One thing I needed a little help with was some dynamic DNS capabilities…
Long story short - MIAB hosts one of my domains for email & web, but I wanted to have a subdomain I could use to access my VPN & NAS servers at home.
So, I wrote a shell script that runs on my pfSense gateway at home, which updates the subdomain records on the MIAB.
Hope this is useful for someone – it is for me!
--------- CONTENTS OF dm-dyndns.sh below ---------
# dm-dyndns v1.0, email@example.com
# Shell script to provide dynamic DNS to a mail-in-the-box platform.
# dig installed
# curl installed
# OpenDNS myip service availability (myip.opendns.com)
# Mailinabox host (see https://mailinabox.email)
# Mailinabox admin username/password in the CFGFILE below
# one line file of the format (curl cfg file):
# user = “username:password”
# Dynamic DNS name to be set
# DYNDNSNAMELIST file contains one hostname per line that needs to be set to this IP.
MYNAME="dm-dyndns" CURRENTIPFILE="$MYNAME.ip" CFGFILE="$MYNAME.cfg" DIGCMD="/usr/local/bin/dig" CURLCMD="/usr/local/bin/curl" CATCMD="/bin/cat" DOMAIN="mydomain.com" MIABHOST="box.$DOMAIN" DYNDNSNAMELIST="$MYNAME.dynlist" if [ ! -x $DIGCMD ]; then echo "$MYNAME: dig command $DIGCMD not found. Check and fix please." exit 99 fi if [ ! -x $CURLCMD ]; then echo "$MYNAME: curl command $CURLCMD not found. Check and fix please." exit 99 fi if [ ! -x $CATCMD ]; then echo "$MYNAME: cat command $CATCMD not found. Check and fix please." exit 99 fi if [ ! -f $CFGFILE ]; then echo "$MYNAME: $CFGFILE not found. Check and fix please." exit 99 fi if [ ! -f $DYNDNSNAMELIST ]; then echo "$MYNAME: $DYNDNSNAMELIST not found. Check and fix please." exit 99 fi MYIP="`$DIGCMD +short myip.opendns.com @resolver1.opendns.com`" if [ -z "$MYIP" ]; then echo "$MYNAME: dig output was blank. Check myip.opendns.com services." exit 99 fi for DYNDNSNAME in `$CATCMD $DYNDNSNAMELIST` do PREVIP="`$DIGCMD +short $DYNDNSNAME @$MIABHOST`" if [ -z "$PREVIP" ]; then echo "$MYNAME: dig output was blank. Check $MIABHOST DNS server." exit 99 fi if [ "x$PREVIP" = "x$MYIP" ]; then echo "$MYNAME: $DYNDNSNAME hasn't changed." else echo "$MYNAME: $DYNDNSNAME changed (previously: $PREVIP, now: $MYIP)" STATUS="`$CURLCMD -X PUT -K $CFGFILE -s -d $MYIP https://$MIABHOST/admin/dns/custom/$DYNDNSNAME`" case $STATUS in "OK") echo "$MYNAME: mailinabox API returned OK, cmd succeded but no update.";; "updated DNS: $DOMAIN") echo "$MYNAME: mailinabox API updated $DYNDNSNAME OK.";; *) echo "$MYNAME: other status from mailinabox API. Please check.";; esac fi done exit 0