Update Cloudflare DNS for both IPv4 and IPv6 Bash Script

update_Cloudflare_DNS.sh

#!/bin/bash

## Account details
auth_email='fred@blogs.com'
auth_key='00000000000000000000000000000000'

## Record to update
zone_name='domain.com'
record_name='domain.com'

## Binary locations (dig and jq need to be installed)
curl='/usr/bin/curl -s'
date='/bin/date'
dig='/usr/bin/dig'
jq='/usr/bin/jq'

## Log file
log_file='cloudflare_dns_update.log'

## Get current date and time
date_time=$($date)

## Get current IP's
wanip4=$($dig @resolver1.opendns.com A myip.opendns.com +short -4)
wanip6=$($dig @resolver1.opendns.com AAAA myip.opendns.com +short -6)

## Get zone_identifier
zone_identifier=$(    
  $curl -X GET "https://api.cloudflare.com/client/v4/zones?name=$zone_name" \
    -H "X-Auth-Email: $auth_email" \
    -H "X-Auth-Key: $auth_key" \
    -H "Content-Type: application/json" \
    | $jq '.result[0].id' --raw-output
)

## Get current IPv4 (A) record
record_ip4=$(
  $curl -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name&type=A" \
    -H "X-Auth-Email: $auth_email" \
    -H "X-Auth-Key: $auth_key" \
    -H "Content-Type: application/json" \
    | $jq '.result[0].content' --raw-output
)

## Get current IPv6 (AAAA) record
record_ip6=$(
  $curl -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name&type=AAAA" \
    -H "X-Auth-Email: $auth_email" \
    -H "X-Auth-Key: $auth_key" \
    -H "Content-Type: application/json" \
    | $jq '.result[0].content' --raw-output
)

# Start logging
echo ---------------------------------------- >> $log_file
echo Date Time: $date_time >> $log_file
echo ---------------------------------------- >> $log_file
echo Current IP4 Address: $wanip4 >> $log_file
echo Current IP4 Record: $record_ip4 >> $log_file
echo Current IP6 Address: $wanip6 >> $log_file
echo Current IP6 Record: $record_ip6 >> $log_file
echo ---------------------------------------- >> $log_file

## Check IPv4
if [ $wanip4 = $record_ip4 ]; then

  echo IPv4 Record matches. Update not needed. >> $log_file

else

  echo IPv4 Record does not match. Update needed. >> $log_file

  ## Get record_identifier for DNS record to update
  record_identifier=$(
    $curl -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name&type=A" \
      -H "X-Auth-Email: $auth_email" \
      -H "X-Auth-Key: $auth_key" \
      -H "Content-Type: application/json" \
      | $jq '.result[0].id' --raw-output
  )
  
  ## Build valid JSON for update
  data_json="{\"type\":\"A\",\"name\":\"$record_name\",\"content\":\"$wanip4\"}"

  ## Update record
  record_update=$(
    $curl -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records/$record_identifier" \
      -H "X-Auth-Email: $auth_email" \
      -H "X-Auth-Key: $auth_key" \
      -H "Content-Type: application/json" \
      --data $data_json \
      | $jq '.success' --raw-output
  )
    
  ## Log if success
  echo IPv4 Record updated: $record_update >> $log_file

fi

## Check IPv6
if [ $wanip6 = $record_ip6 ]; then

  echo IPv6 Record matches. Update not needed. >> $log_file

else
  
  echo IPv6 Record does not match. Update needed. >> $log_file

  ## Get record_identifier for DNS record to update
  record_identifier=$(
    $curl -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name&type=AAAA" \
      -H "X-Auth-Email: $auth_email" \
      -H "X-Auth-Key: $auth_key" \
      -H "Content-Type: application/json" \
      | $jq '.result[0].id' --raw-output
  )
  
  ## Build valid JSON for update
  data_json="{\"type\":\"AAAA\",\"name\":\"$record_name\",\"content\":\"$wanip6\"}"

  ## Update record
  record_update=$(
    $curl -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records/$record_identifier" \
      -H "X-Auth-Email: $auth_email" \
      -H "X-Auth-Key: $auth_key" \
      -H "Content-Type: application/json" \
      --data $data_json \
      | $jq '.success' --raw-output
  )
   
  ## Log if success   
  echo IPv6 Record updated: $record_update >> $log_file
  
fi

echo ---------------------------------------- >> $log_file && echo >> $log_file

exit 0

line 101: [: too many arguments