Cloudflare DNS update for openwrt

cloudflare-ddns.sh

ddns の更新用

```sh
#!/bin/bash

## ddns updater に指定するためのもの

#grep=/usr/libexec/grep-gnu
#NGN_IF=eth1
#NEW_IP=$(curl -s  https://api.ipify.org )

expr match $CURRENT_IP  $IPV4_REGEX  && is_v4=1;
expr match $CURRENT_IP  $IPV6_REGEX  && is_v6=1;

DNS_RECORD_TYPE='x'
DNS_RECORD_HOST=$lookup_host
NEW_IP=$CURRENT_IP
[ -n "$is_v4" ] && DNS_RECORD_TYPE=A
[ -n "$is_v6" ] && DNS_RECORD_TYPE=AAAA


d=/etc/config/custom/ddns
updater=$d/cloudflare-update-dns.sh

[ "$DNS_RECORD_TYPE" = 'x' ] && exit;
##
$updater $DNS_RECORD_HOST $DNS_RECORD_TYPE $NEW_IP

root@FukaeWrt:/etc/config/custom/ddns# cat cloudflare-update-dns.sh
#!/bin/bash

ZONE_ID=86xxxxxxxxxxxxxxxxxxxxxx
API_TOKEN=vt_a5xxxxxxxxxxxxxxxxxxxxxxxP3Q-A



function update_cloudflare_dns_record(){

##
DNS_RECORD_ID=$1
DNS_RECORD_HOST=$2
DNS_RECORD_TYPE=$3
NEW_IP=$4

##
JSON=$(cat <<EOS
{
  "comment": "",
  "name": "$DNS_RECORD_HOST",
  "proxied": false,
  "settings": {},
  "tags": [],
  "ttl": 1,
  "content": "$NEW_IP",
  "type": "$DNS_RECORD_TYPE"
}
EOS
)

JSON=$( echo $JSON | jq . -rc )

##
result=$(echo curl -s -X PATCH \
"https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$DNS_RECORD_ID" \
-H "'Authorization: Bearer $API_TOKEN'" \
-H "'Content-Type: application/json'" \
--data "'$JSON'" | bash )

echo $result | jq .
if [[ 'true' != $(echo $result | jq .success) ]]; then
 exit 1
fi


}

function record_id(){
 f=`readlink -f $0`
 d=`dirname $f`
 lists=$d/cloudflare-list-records.sh

 $lists | grep $1  | grep $2


}


function main(){


  if (( 3> $# )) ; then
    echo arguments required.
    echo
    echo Usage:
    echo
    echo    $0 DNS_RECORD_TYPE DNS_RECORD_TYPE NEW_IP
    echo
    exit 1
  fi

  result=($( record_id $1 $2  ))
  DNS_RECORD_ID=${result[0]}
  DNS_RECORD_HOST=$1
  DNS_RECORD_TYPE=$2
  NEW_IP=$3
  update_cloudflare_dns_record $DNS_RECORD_ID $DNS_RECORD_HOST $DNS_RECORD_TYPE $NEW_IP

}

main $@