127 lines
3.7 KiB
Bash
Executable File
127 lines
3.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# set -x
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set -e
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#
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# Source the environment variables
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#
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if [[ -f .env ]]; then
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source .env
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elif [[ -f /etc/azure-dns-update/.env ]]; then
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source /etc/azure-dns-update/.env
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else
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#if [[ ! -f .env ]]; then
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echo "MISSING .env FILE!"
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exit -1
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fi
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#
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# Logging
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#
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write_log() {
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logLevel='DEBUG'
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if [[ ! -z $2 ]]; then
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echo "$1: $2"
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else
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echo "logLevel: $1"
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fi
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}
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write_message() {
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write_log 'INFO' "$1"
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}
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#
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# CURL to get the bearer token for the following calls
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#
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get_token() {
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curl -s -X POST \
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-d "grant_type=client_credentials&client_id=$CLIENT_ID&client_secret=$CLIENT_SECRET&resource=https%3A%2F%2Fmanagement.azure.com%2F" \
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https://login.microsoftonline.com/$TENANT_ID/oauth2/token | jq --raw-output '.access_token'
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}
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#
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# CURL to get the recordset
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#
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get_recordset() {
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curl -s -X GET \
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-H "Authorization: Bearer $access_token" \
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-H "Content-Type: application/json" \
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https://management.azure.com/subscriptions/$SUBSCRIPTION_ID/resourceGroups/$resource_group/providers/Microsoft.Network/dnsZones/$zone_name/$RECORD_TYPE/$RELATIVE_RECORD_SET_NAME?api-version=2018-05-01 \
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| jq '.'
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}
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#
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# Parses the IPv4 IP Address from the Record Set response
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#
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get_recordset_address() {
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get_recordset | jq --raw-output '.properties.ARecords[].ipv4Address'
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}
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#
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# Updates and formats the record set to be used in the PUT request body
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#
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update_recordset() {
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echo $azure_recordset | jq -r ".properties.ARecords[].ipv4Address = \"$1\" | del(.name,.type,.id,.properties.fqdn,.properties.provisioningState) | @text"
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}
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#
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# CURL to PUT the updated record set
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#
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put_recordset() {
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curl -s -X PUT \
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-H "Authorization: Bearer $access_token" \
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-H "Content-Type: application/json" \
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--data-raw "$1" \
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https://management.azure.com/subscriptions/$SUBSCRIPTION_ID/resourceGroups/$resource_group/providers/Microsoft.Network/dnsZones/$zone_name/$RECORD_TYPE/$RELATIVE_RECORD_SET_NAME?api-version=2018-05-01
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}
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resource_group_list=($RESOURCE_GROUP_NAMES)
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zone_list=($ZONE_NAMES)
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write_message "======================================="
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write_message "======================================="
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for i in "${!resource_group_list[@]}"; do
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resource_group="${resource_group_list[i]}"
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zone_name="${zone_list[i]}"
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access_token=$(get_token)
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# Get the Record Set
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azure_recordset=$(get_recordset)
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write_message "Azure Record Set: $zone_name"
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# Parse the Record Set
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azure_ip_address=$(get_recordset_address $azure_recordset)
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write_message "Azure IP: $azure_ip_address"
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# Get the currently assigned Public IP
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isp_ip_address=$(dig +short myip.opendns.com @resolver1.opendns.com)
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write_message "ISP IP: $isp_ip_address"
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# If the currently assigned public IP doesn't match the configured IP address in Azure...
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# update the Azure record set.
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if [ $azure_ip_address != $isp_ip_address ]; then
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write_message "IP ADDRESSES DON'T MATCH. UPDATING..."
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# Prepare the request content
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azure_recordset_UPDATE=$(update_recordset $isp_ip_address)
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write_message $azure_recordset_UPDATE
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# Perform the Update
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AZURE_PUT_RESPONSE=$(put_recordset $azure_recordset_UPDATE)
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write_message "Azure PUT Response: $AZURE_PUT_RESPONSE"
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write_message "======================================="
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write_message $'Azure IP Address updated successfully\n'
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write_message "======================================="
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else
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write_message "======================================="
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write_message $'IP Address is up to date.\n'
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write_message "======================================="
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fi
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done
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write_message "======================================="
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write_message "======================================="
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