From a435fb75c5aba0cc3c64635941b4965f0f14c47c Mon Sep 17 00:00:00 2001
From: Alper Kanat <alper.kanat@monitise.com>
Date: Sat, 23 Jan 2016 18:47:35 +0200
Subject: [PATCH] initial commit

---
 Dockerfile |  5 +++++
 README.md  |  1 +
 dyndns.sh  | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 README.md
 create mode 100755 dyndns.sh

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..444331f
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,5 @@
+FROM alpine
+MAINTAINER Alper Kanat <tunix@raptiye.org>
+RUN apk --no-cache add curl jq
+COPY dyndns.sh /
+ENTRYPOINT exec /dyndns.sh
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..f65ddeb
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+# Dynamic DNS using DigitalOcean's DNS Services
diff --git a/dyndns.sh b/dyndns.sh
new file mode 100755
index 0000000..5610bad
--- /dev/null
+++ b/dyndns.sh
@@ -0,0 +1,42 @@
+#!/bin/sh
+
+api_host="https://api.digitalocean.com/v2"
+sleep_interval=${SLEEP_INTERVAL:-300}
+
+die() {
+    echo "$1"
+    exit 1
+}
+
+test -z $DIGITALOCEAN_TOKEN && die "DIGITALOCEAN_TOKEN not set!"
+test -z $DOMAIN && die "DOMAIN not set!"
+test -z $NAME && die "NAME not set!"
+
+dns_list="$api_host/domains/$DOMAIN/records"
+domain_records=$(curl -s -X GET \
+    -H "Content-Type: application/json" \
+    -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
+    $dns_list)
+record_id=$(echo $domain_records| jq ".domain_records[] | select(.name == \"$NAME\") | .id")
+
+test -z $record_id && die "No record found with given domain name!"
+
+while ( true ); do
+    ip="$(curl -s ipinfo.io/ip)"
+    data="{\"type\": \"A\", \"name\": \"$NAME\", \"data\": \"$ip\"}"
+    url="$dns_list/$record_id"
+
+    if [[ -n $ip ]]; then
+        echo "Sending data=$data to url=$url"
+
+        curl -s -X PUT \
+            -H "Content-Type: application/json" \
+            -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
+            -d "$data" \
+            "$url" &> /dev/null
+    else
+        echo "IP wasn't retrieved within allowed interval. Will try $sleep_interval seconds later.."
+    fi
+
+    sleep $sleep_interval
+done