dotfiles/systemd/system/timer-scripts/template.set_a_records.sh

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#!/usr/bin/env bash
declare wan_ip_record wan_ip cf_records host_record cf_host_ip cf_rec_id
declare -r HOST=<your-subdomain>
declare -r DOMAIN=<your-domain-name>
declare -r TOKEN=<your-api-token>
declare -r ZONE_ID=<this-zones-id>
#╔─────────────────────────────────────────────────────────────────────────────╗
#│ Gετ WΛN IP |
#╚─────────────────────────────────────────────────────────────────────────────╝
if ! wan_ip_record="$(host -W2 myip.opendns.com resolver1.opendns.com)"; then
echo "Hosts timed out" >&2
exit 1
fi
wan_ip="$(echo "$wan_ip_record" | tail -n1 | awk '{ split($0, a, " "); print a[4] }')"
#╔─────────────────────────────────────────────────────────────────────────────╗
#│ Gετ Λ rεcδrd δη Clδμdflαrε |
#╚─────────────────────────────────────────────────────────────────────────────╝
if ! cf_records="$(curl -s --request GET \
--url https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records \
--header 'Content-Type: application/json' \
--header "Authorization: Bearer $TOKEN")"
then
echo "Failed to retrive cloudflare zone records" >&2
exit 1
fi
for i in {0..4000}; do # Assuming 4000 is enough
record="$(echo "$cf_records" | jq --raw-output ".result[${i}].name")"
if [[ "$record" == "${HOST}.${DOMAIN}" ]]; then
host_record="$(echo "$cf_records" | jq -r ".result[${i}]")"
break
elif [[ "$record" == null ]]; then
echo "No record found for ${HOST}.${DOMAIN}" >&2
exit 1
fi
done
#╔─────────────────────────────────────────────────────────────────────────────╗
#│ Sετ Λ rεcδrd τδ cμrrεητ WΛN |
#╚─────────────────────────────────────────────────────────────────────────────╝
cf_host_ip="$(echo "$host_record" | jq -r '.content')"
cf_rec_id="$(echo "$host_record" | jq -r '.id')"
if [[ -z "$cf_host_ip" || "$cf_host_ip" == null ]]; then
echo "Failed to find content of A record for ${HOST}.${DOMAIN}" >&2
exit 1
elif [[ -z "$cf_rec_id" || "$cf_rec_id" == null ]]; then
echo "Failed to find A record ID for ${HOST}.${DOMAIN}" >&2
exit 1
fi
if [[ "$cf_host_ip" == "$wan_ip" ]]; then
echo "Cloudflare is up to date @ $(date)" >&2
else
echo "Updating Cloudflare's A record from $cf_host_ip to $wan_ip" >&2
patch_response="$(curl -s --request PATCH \
--url "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records/${cf_rec_id}" \
--header 'Content-Type: application/json' \
--header "Authorization: Bearer $TOKEN" \
--data '{
"comment": "'"${HOST} @ $(date)"'",
"content": "'"$wan_ip"'",
"name": "'"${HOST}.${DOMAIN}"'",
"proxied": false,
"ttl": 1
}')"
if [[ "$(echo "$patch_response" | jq -r '.success')" == true ]]; then
echo "Update to $wan_ip succeeded @ $(date)" >&2
else
echo "Failed to update A record. DUMP:"
echo "$patch_response"
exit 1
fi
fi