#!/bin/bash
# DynDNS Script for Hetzner DNS API by FarrowStrange
# v1.2# get OS environment variables
auth_api_token=${HETZNER_AUTH_API_TOKEN:-‘U6nxrDkt9T4O4opYTkhwXndbzn97CLpW’}zone_name=${HETZNER_ZONE_NAME:-‘pbj-design.dk’} <– Insert your own account
zone_id=${HETZNER_ZONE_ID:-‘XXXXXXXXXXXXXX’} <– Insert your own token
record_name=${HETZNER_RECORD_NAME:-‘www’} <– Insert your own DDNS name
record_ttl=${HETZNER_RECORD_TTL:-‘300’}
record_type=${HETZNER_RECORD_TYPE:-‘A’}
display_help() {
cat <<EOF
exec: ./dyndns.sh [ -z <Zone ID> | -Z <Zone Name> ] -r <Record ID> -n <Record Name>
parameters:
-z – Zone ID
-Z – Zone name
-r – Record ID
-n – Record name
optional parameters:
-t – TTL (Default: 60)
-T – Record type (Default: A)
help:
-h – Show Help
requirements:
curl, dig and jq are required to run this script.
example:
.exec: ./dyndns.sh -z 98jFjsd8dh1GHasdf7a8hJG7 -r AHD82h347fGAF1 -n dyn
.exec: ./dyndns.sh -Z example.com -n dyn -T AAAA
EOF
exit 1
}
logger() {
echo ${1}: Record_Name: ${record_name} : ${2}
}
while getopts “:z:Z:r:n:t:T:h” opt; do
case “$opt” in
z ) zone_id=”${OPTARG}”;;
Z ) zone_name=”${OPTARG}”;;
r ) record_id=”${OPTARG}”;;
n ) record_name=”${OPTARG}”;;
t ) record_ttl=”${OPTARG}”;;
T ) record_type=”${OPTARG}”;;
h ) display_help;;
\? ) echo “Invalid option: -$OPTARG” >&2; exit 1;;
: ) echo “Missing option argument for -$OPTARG” >&2; exit 1;;
* ) echo “Unimplemented option: -$OPTARG” >&2; exit 1;;
esac
done
# Check if tools are installed
for cmd in curl dig jq; do
if ! command -v “${cmd}” &> /dev/null; then
logger Error “To run the script ‘${cmd}’ is needed, but it seems not to be installed.”
logger Error “Please check ‘https://github.com/FarrowStrange/hetzner-api-dyndns#install-tools’ for more informations and try again.”
exit 1
fi
done
# Check if api token is set
if [[ “${auth_api_token}” = “” ]]; then
logger Error “No Auth API Token specified.”
exit 1
fi
# get all zones
zone_info=$(curl -s –location \
“https://dns.hetzner.com/api/v1/zones” \
–header ‘Auth-API-Token: ‘${auth_api_token})
# check if either zone_id or zone_name is correct
if [[ “$(echo ${zone_info} | jq –raw-output ‘.zones[] | select(.name==”‘${zone_name}'”) | .id’)” = “” && “$(echo ${zone_info} | jq –raw-output ‘.zones[] | select(.id==”‘${zone_id}'”) | .name’)” = “” ]]; then
logger Error “Something went wrong. Could not find Zone ID.”
logger Error “Check your inputs of either -z <Zone ID> or -Z <Zone Name>.”
logger Error “Use -h to display help.”
exit 1
fi
# get zone_id if zone_name is given and in zones
if [[ “${zone_id}” = “” ]]; then
zone_id=$(echo ${zone_info} | jq –raw-output ‘.zones[] | select(.name==”‘${zone_name}'”) | .id’)
fi
# get zone_name if zone_id is given and in zones
if [[ “${zone_name}” = “” ]]; then
zone_name=$(echo ${zone_info} | jq –raw-output ‘.zones[] | select(.id==”‘${zone_id}'”) | .name’)
fi
logger Info “Zone_ID: ${zone_id}”
logger Info “Zone_Name: ${zone_name}”
if [[ “${record_name}” = “” ]]; then
logger Error “Mission option for record name: -n <Record Name>”
logger Error “Use -h to display help.”
exit 1
fi
# get current public ip address
if [[ “${record_type}” = “AAAA” ]]; then
logger Info “Using IPv6, because AAAA was set as record type.”
cur_pub_addr=$(dig -6 ch TXT +short whoami.cloudflare @2606:4700:4700::1111 | awk -F ‘”‘ ‘{print $2}’)
if [[ “${cur_pub_addr}” = “” ]]; then
logger Error “It seems you don’t have a IPv6 public address.”
exit 1
else
logger Info “Current public IP address: ${cur_pub_addr}”
fi
elif [[ “${record_type}” = “A” ]]; then
logger Info “Using IPv4, because A was set as record type.”
# cur_pub_addr=$(dig -4 ch TXT +short whoami.cloudflare @1.1.1.1 | awk -F ‘”‘ ‘{print $2}’)
cur_pub_addr=$(curl ifconfig.co | awk -F ‘”‘ ‘{print $1}’)
if [[ “${cur_pub_addr}” = “” ]]; then
logger Error “Apparently there is a problem in determining the public ip address.”
exit 1
else
logger Info “Current public IP address: ${cur_pub_addr}”
fi
else
logger Error “Only record type \”A\” or \”AAAA\” are support for DynDNS.”
exit 1
fi
# get record id if not given as parameter
if [[ “${record_id}” = “” ]]; then
record_zone=$(curl -s -w “\n%{http_code}” –location \
–request GET ‘https://dns.hetzner.com/api/v1/records?zone_id=’${zone_id} \
–header ‘Auth-API-Token: ‘${auth_api_token})
http_code=$(echo ${record_zone} | awk ‘{print $(NF)}’)
if [[ “${http_code}” != “200” ]]; then
logger Error “HTTP Response ${http_code} – Aborting run to prevent multipe records.”
exit 1
else
record_id=$(echo ${record_zone} | jq | sed ‘$d’ | jq –raw-output ‘.records[] | select(.type == “‘${record_type}'”) | select(.name == “‘${record_name}'”) | .id’)
fi
fi
logger Info “Record_ID: ${record_id}”
# create a new record
if [[ “${record_id}” = “” ]]; then
echo “DNS record \”${record_name}\” does not exists – will be created.”
curl -s -X “POST” “https://dns.hetzner.com/api/v1/records” \
-H ‘Content-Type: application/json’ \
-H ‘Auth-API-Token: ‘${auth_api_token} \
-d $'{
“value”: “‘${cur_pub_addr}'”,
“ttl”: ‘${record_ttl}’,
“type”: “‘${record_type}'”,
“name”: “‘${record_name}'”,
“zone_id”: “‘${zone_id}'”
}’
else
# check if update is needed
cur_dyn_addr=`curl -s “https://dns.hetzner.com/api/v1/records/${record_id}” -H ‘Auth-API-Token: ‘${auth_api_token} | jq –raw-output ‘.record.value’`
logger Info “Currently set IP address: ${cur_dyn_addr}”
# update existing record
if [[ $cur_pub_addr == $cur_dyn_addr ]]; then
logger Info “DNS record \”${record_name}\” is up to date – nothing to to.”
exit 0
else
logger Info “DNS record \”${record_name}\” is no longer valid – updating record”
curl -s -X “PUT” “https://dns.hetzner.com/api/v1/records/${record_id}” \
-H ‘Content-Type: application/json’ \
-H ‘Auth-API-Token: ‘${auth_api_token} \
-d $'{
“value”: “‘${cur_pub_addr}'”,
“ttl”: ‘${record_ttl}’,
“type”: “‘${record_type}'”,
“name”: “‘${record_name}'”,
“zone_id”: “‘${zone_id}'”
}’
if [[ $? != 0 ]]; then
logger Error “Unable to update record: \”${record_name}\””
logger ERROR >> /tmp/dyndns
else
logger Info “DNS record \”${record_name}\” updated successfully”
logger INFO >> /tmp/dyndns
fi
fi
fi |
