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⚙️ Cloudflare dynamic DNS with curl(1)
#!/bin/sh
# MIT License
#
# Copyright (c) 2018 Ricard Bejarano
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
function update() {
curl \
-X PUT \
-H "Content-Type: application/json" \
-H "X-Auth-Email: $CLOUDFLARE_EMAIL" \
-H "X-Auth-Key: $CLOUDFLARE_KEY" \
-d "{\"id\":\"$2\",\"type\":\"A\",\"name\":\"$1\",\"content\":\"$3\"}" \
"https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$2" &>/dev/null
echo "$1$3"
}
function main() {
local old_address
local new_address
while true
do
new_address="$(curl -s 'https://api.ipify.org')"
if [ "$old_address" != "$new_address" ]
then
update "$DOMAIN" "$DOMAIN_ID" "$new_address"
old_address="$new_address"
fi
sleep 1
done
}
echo "Starting $(basename "$0")..."
main
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