Created
April 15, 2025 19:24
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Simple script to update DDNS IP for DynuDNS domain
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| #!/usr/bin/env bash | |
| # https://www.dynu.com/DynamicDNS/IPUpdateClient/cURL | |
| #### OPTIONS | |
| set -o errexit -o pipefail | |
| #### DEFINITIONS | |
| PROG=$(basename "${0}") | |
| DDNS_USERNAME="${DDNS_USERNAME:-}" | |
| DDNS_PASSWORD="${DDNS_PASSWORD:-}" | |
| DDNS_HOSTNAME="${DDNS_HOSTNAME:-}" | |
| DDNS_ALIAS="${DDNS_ALIAS:-}" | |
| IPV4="${DDNS_IPV4:-auto}" | |
| IPV6="${DDNS_IPV6:-no}" | |
| #### FUNCTIONS | |
| ## Function to throw an error | |
| function throw_error() { | |
| local error_input="${1}" | |
| printf "[ERROR]: %s\n" "${error_input}" >&2 | |
| exit 1 | |
| } | |
| function is_installed(){ | |
| local input="${1}" | |
| if ! command -v "${input}" >/dev/null 2>&1; then | |
| throw_error "Cannot find '${input}' in PATH. Please make sure '${input}' is installed and is in your PATH" | |
| fi | |
| } | |
| #### MAIN | |
| is_installed "curl" | |
| curl \ | |
| --location \ | |
| --user "${DDNS_USERNAME}:${DDNS_PASSWORD}" \ | |
| "https://api.dynu.com/nic/update?hostname=${DDNS_HOSTNAME}&myip=${IPV4}&myipv6=${IPV6}" |
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