Simple Namecheap Dynamic DNS client

namecheap-ddns

#!/bin/sh
set -eu
FETCH="curl -s"
# or for curl:
#FETCH="curl -s"
# $1: your domain
# $2: subdomain to update use @ for TLD
# $3: the password given to you by Namecheap's web interface
#
# Rerun this script every 5 minutes. Crontab entry (not as root):
# */5 * * * *  namecheap-ddns bla.com @ asdjfasfasdfasdf https://hc-ping.com asdfg-asdf-asdf-asdfg-asdjfkl

domain=$1
host=$2
password=$3
healthcheck_host=$4
healthcheck_id=$5

curl -sS -X POST -o /dev/null "$healthcheck_host/$healthcheck_id/start"

out=$(${FETCH} "https://dynamicdns.park-your-domain.com/update?host=${host}&domain=${domain}&password=${password}")
grep -q "<ErrCount>0</ErrCount>" <<EOF && curl -sS -X POST -o /dev/null "$healthcheck_host/$healthcheck_id" && exit 0
${out}
EOF
cat <<EOF
${out}
EOF
curl -sS -X POST -o /dev/null --fail "$healthcheck_host/$healthcheck_id"
exit 1