First commit

README.md

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+# Gandi-dyndns
+
+A simple bash script to 
+
+# Requirements
+Probably already installed on the machine:
+- bash
+- sed
+- curl
+
+To install:
+- [jq](https://stedolan.github.io/jq/)
+
+# Getting started
+1. Copy the [bash file](./update.sh) somewhere
+2. Allow script execution :
+```
+$ chmod u+x ./update.sh
+```
+3. Change settings in the script
+4. Launch the script (and possibly add a CRON entry or a systemd timer)

update.sh

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+#!/bin/bash
+
+api_key='MyApiKey'
+api_endpoint='https://dns.api.gandi.net/api/v5'
+
+ifconfig='https://homnomnom.fr/ip/'
+
+host="example.com"
+ttl='300'
+
+domainsV4=(
+    "subdomain1"
+    "subdomain2"
+)
+
+domainsV6=(
+    "subdomain3"
+    "subdomain4"
+)
+
+#script below
+function die {
+    echo -e $1 >&2
+    kill -HUP $$
+}
+
+function get_api {
+    tmpfile=$(mktemp)
+    http_code=$(curl --silent "${api_endpoint}/${1}" \
+                     --header "Content-Type: application/json" \
+                     --header "X-Api-Key: ${api_key}" \
+                     --output ${tmpfile} \
+                     --write-out '%{http_code}')
+
+    message=$(cat ${tmpfile})
+    rm ${tmpfile}
+
+    if [[ ${http_code} != "200" ]]; then
+        die "API GET call exited with code ${http_code}.\nMessage: ${message}"
+    fi
+
+    echo ${message}
+}
+
+function put_api {
+    tmpfile=$(mktemp)
+    http_code=$(curl --request PUT \
+         --header "Content-Type: application/json" \
+         --header "X-Api-Key: ${api_key}" \
+         --silent \
+         --output ${tmpfile} \
+         --write-out '%{http_code}' \
+         "${api_endpoint}/${1}" \
+         -d "${2}")
+
+    message=$(cat ${tmpfile})
+    rm ${tmpfile}
+
+    if [[ ${http_code} != "201" ]]; then
+        die "API PUT call exited with code ${http_code}.\nMessage: ${message}"
+    fi
+
+    echo ${message}
+}
+
+#find out zone UUID for domain
+uuid=$(get_api "domains/${host}")
+uuid=$(echo ${uuid} | jq '.zone_uuid' | sed 's/"//g')
+echo "UUID: ${uuid}"
+
+ipv4=$(curl -4 --silent ${ifconfig})
+echo "detected IPv4 address: ${ipv4}"
+for domain in ${domainsV4[@]}; do
+    ip=$(get_api "zones/${uuid}/records/${domain}/A" | jq '.rrset_values[0]' | sed 's/"//g')
+    if [ "${ip}" == "${ipv4}" ]; then
+        echo "- ${domain}.${host}: IP already OK"
+    else
+        payload='{"rrset_ttl": '${ttl}', "rrset_values": ["'${ipv4}'"]}'
+
+        put_api "zones/${uuid}/records/${domain}/A" "${payload}" >/dev/null
+        echo "- ${domain}.${host}: replaced ${ip} with ${ipv4}"
+    fi
+done
+
+ipv6=$(curl -6 --silent ${ifconfig})
+echo "detected IPv6 address: ${ipv6}"
+for domain in ${domainsV6[@]}; do
+    ip=$(get_api "zones/${uuid}/records/${domain}/AAAA" | jq '.rrset_values[0]' | sed 's/"//g')
+    if [ "${ip}" == "${ipv6}" ]; then
+        echo "- ${domain}.${host}: IP already OK"
+    else
+        payload='{"rrset_ttl": '${ttl}', "rrset_values": ["'${ipv6}'"]}'
+
+        put_api "zones/${uuid}/records/${domain}/AAAA" "${payload}" >/dev/null
+        echo "- ${domain}.${host}: replaced ${ip} with ${ipv6}"
+    fi
+done