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February 4, 2023 20:02
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Save kulp/eb105c1a5e15d7c32f67b2b4fba0bcd4 to your computer and use it in GitHub Desktop.
Check public IP address and update NearlyFreeSpeech DNS with the result
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| #!/usr/bin/env bash | |
| curl --silent --fail -4 api64.ipify.org "$@" || | |
| curl --silent --fail https://httpbin.org/ip "$@" | jq --raw-output .origin |
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| #!/usr/bin/env bash | |
| # Fail early and loudly. | |
| set -euo pipefail | |
| here=$(dirname $0) | |
| store=$HOME/.public-ip | |
| if [[ "$(cat $store || true)" != "$($here/get_ip.sh | tee $store)" ]] | |
| then | |
| exec "$@" | |
| fi |
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| #!/usr/bin/env bash | |
| # Fail early and loudly. | |
| set -euo pipefail | |
| sha1 () | |
| { | |
| echo -n "$1" | shasum | cut -b1-40 | |
| } | |
| user=$1 | |
| api_key=$2 | |
| fqdn=$3 | |
| ip=$4 | |
| shift 4 | |
| domain=${fqdn#*.} | |
| subdomain=${fqdn%%.*} | |
| ttl=600 | |
| now=$(date +%s) | |
| salt=$( (LC_ALL=C tr -c -d A-Za-z0-9 < /dev/urandom || true) | dd bs=1 count=16 2> /dev/null) | |
| base=https://api.nearlyfreespeech.net | |
| request_uri=/dns/$domain/replaceRR | |
| # TODO support IPv6 too. | |
| body="name=$subdomain&type=A&data=$ip&ttl=$ttl" | |
| body_hash=$(sha1 "$body") | |
| hash="$(sha1 "$user;$now;$salt;$api_key;$request_uri;$body_hash")" | |
| auth="$user;$now;$salt;$hash" | |
| echo -n "$body" | | |
| curl --silent \ | |
| --fail \ | |
| --data @- \ | |
| --header "X-NFSN-Authentication: $auth" \ | |
| $base$request_uri |
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This Bash script can be used to update a DNS type A (IPv4) record on a domain hosted with NearlyFreeSpeech. This can be useful for keeping a DNS entry updated for a home IP address.