Add ipupdater

ipupdater

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+#!/bin/bash
+
+homeip=/home/jaileduser/nginx/homeip
+recordip=/home/jaileduser/nginx/recordip
+#define where you want the bashddns log to live
+bashddnslog=/var/log/bashddns.log
+
+changetime() {
+
+local newip=$(cat "$homeip")
+
+#here i use @ because i want to update the root of my domain and a TTL of 3600 (standard for A records)
+pdnsutil replace-rrset yourdomain.name @ A 3600 "$newip"
+
+#increasing the serial number in the SOA so the slave nameserver is notified of changes to the domain
+pdnsutil increase-serial yourdomain.name
+
+#updating the record ip file with the new ip
+cat "$homeip" > "$recordip"
+
+#the following last line is optional
+#it uses ssmtp to send an email notification when changes to the A record are made
+#ssmtp or any other command line compatible mail sending utility will work
+
+echo -e "Subject: domain.name updated A record\nYour home ip has changed!" | ssmtp mail@site.name
+
+}
+
+#though we made sure on the nginx server not to send the file if it was empty
+#we will implement a double check here for redundancy
+#only run the following *if* homeip is not empty 
+
+if ! [ -z "$(cat "$homeip")" ] ; then
+
+#if homeip/recordip files are the same do nothing, else run changetime
+#log all actions to a centralized file for auditing
+
+diff "$homeip" "$recordip" && \
+echo "A record matches homeip at $(date -u) no action taken" >> "$bashddnslog" \
+&& exit 0 \
+|| changetime && echo "changed A record at $(date -u) to "$(cat "$recordip")"" >> "$bashddnslog"
+
+else
+echo "no action taken due to homeip file being empty at $(date -u)" >> "$bashddnslog"
+fi