cloudflare.sh

	#!/bin/sh
## Inspired by
## http://epistrephe.in/2016-09-21/cloudflare-dynamic-dns/

## Load config
if [ -L $0 ]
then
	source `readlink -e $0 | sed "s:[^/]*$:config:"`
else
	source `echo $0 | sed "s:[^/]*$:config:"`
fi

## Added Functions
case $1 in
  getdns )
    echo "getting all DNS records"
    curl -X GET "https://api.cloudflare.com/client/v4/zones?name=$DOMAIN_NAME" \
      -H "X-Auth-Email: $EMAIL_ADDR" \
      -H "X-Auth-Key: $AUTH_KEY" \
      -H "Content-Type: application/json"|jq
    ## CloudFlare legacy API
    # curl https://www.cloudflare.com/api_json.html \
    #   -d 'a=rec_load_all' \
    #   -d "tkn=$AUTH_KEY" \
    #   -d "email=$EMAIL_ADDR" \
    #   -d "z=$DOMAIN_NAME"|jq
    ;;
  zonelookup )
    curl -X GET "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records?name=dyn.$DOMAIN_NAME" \
      -H "X-Auth-Email: $EMAIL_ADDR" \
      -H "X-Auth-Key: $AUTH_KEY" \
      -H "Content-Type: application/json"|jq
    ;;
  update )
    ## Checking if an update is necessery.
    [ ! -f ./currentip ] && touch ./currentip
    ## Original Suggestion for resolving external IP
    ## NEWIP=`dig +short myip.opendns.com @resolver1.opendns.com`
    echo "getting external IP"
    NEWIP=`curl https://ifconfig.co`
    echo External IP appears to be $NEWIP
    CURRENTIP=`cat ./currentip`
    echo Reading stored IP

    if [ "$NEWIP" = "$CURRENTIP" ]
    then
      ## This section should be replaced with something smarter.
      echo "IP address unchanged"
    else
      echo "Updating DNS records for dyn.$DOMAIN_NAME to point at $NEWIP"
      curl -X PUT "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$RECID" \
        -H "X-Auth-Email: $EMAIL_ADDR" \
        -H "X-Auth-Key: $AUTH_KEY" \
        -H "Content-Type: application/json" \
        --data "{\"type\":\"A\",\"name\":\"dyn.$DOMAIN_NAME\",\"content\":\"$NEWIP\"}"
      echo $NEWIP > /var/tmp/currentip.txt
      ## CloudFlare legacy API
      # curl https://www.cloudflare.com/api_json.html \
      #   -d 'a=rec_edit' \
      #   -d "tkn=$AUTH_KEY" \
      #   -d email="$EMAIL_ADDR" \
      #   -d "z=$DOMAIN_NAME" \
      #   -d "id=RECID" \
      #   -d 'type=A' \
      #   -d "name=dyn.$DOMAIN_NAME" \
      #   -d 'ttl=1' \
      #   -d "content=$NEWIP"
      echo $NEWIP > ./currentip
    fi
    ;;
  * )
    echo "usage: ./cloudflare.sh getdns|update"
  ;;
esac

config

## Inspired by
## http://epistrephe.in/2016-09-21/cloudflare-dynamic-dns/
# X-Auth-Email
EMAIL_ADDR='replace@me.com'

# X-Auth-Key
## Obtained at the bottom of https://www.cloudflare.com/my-account
AUTH_KEY="REPLACEME"

# External IP Address
EXTERNAL_IP=`curl ifconfig.co`

# DomainName
DOMAIN_NAME="REPLACEME"

# ZoneID
ZONE_ID="REPLACEME"

# Record ID
RECID="REPLACEME"