Dynamic DNS script using Cloudflare API v4 or CloudXNS API v2

cloudflare-cloudxns-ddns.sh

#!/bin/bash

# can be A or AAAA
do_record=AAAA
# the interface to get ipv6 address
iface=eth0
# the static suffix we should add to
v6_suf=53
# cloudflare stuff
cf_mail="me@email.com"
cf_authkey="012345689abcdef0123456789abcdef012345"
# cloudxns stuff
cx_apikey="012345689abcdef0123456789abcdef"
cx_seckey="012345689abcdef0"

USE="cloudxns"

record=aaa.com

cachef=/tmp/ddns-$record

update () {
    if [[ $USE = "cloudflare" ]]; then
        cfupdate $@
    else
        cxupdate $@
    fi
}

_cfapi() {
    uri=$1
    data=$@
    if [[ -z $data ]]; then
        curl -s -X GET "https://api.cloudflare.com/client/v4/$uri" \
            -H "X-Auth-Email: $cf_mail" \
            -H "X-Auth-Key: $cf_authkey" \
            -H "Content-Type: application/json"
    else
        curl -s -X PUT "https://api.cloudflare.com/client/v4/$uri" \
            -H "X-Auth-Email: $cf_mail" \
            -H "X-Auth-Key: $cf_authkey" \
            -H "Content-Type: application/json" \
            --data "$data"
    fi
}


cfupdate () {
    _type=$1
    _addr=$2
    echo "Update $_type record for $record to $_addr"

    ret=$(_cfapi "zones/$zoneid/dns_records/$recordid" "{\"type\":\"$_type\",\"name\":\"$record\",\"content\":\"$_addr\"}")
    
    if [[ -z $(echo $ret|grep -oP "success\":[^\"]+"|grep true) ]]; then
        echo $ret
    else
        echo "OK."
    fi
}

_cxapi() {
    uri=$1
    data=$2

    url="https://www.cloudxns.net/api2/$uri"
    timestamp=$(date -R)

    mac_raw="${cx_apikey}${url}${data}${timestamp}${cx_seckey}"
    mac=$(echo -n $mac_raw | md5sum | awk '{print $1}')

    if [[ -z $data ]]; then
        curl -s -k $url \
            -H "API-KEY:$cx_apikey" \
            -H "API-REQUEST-DATE:$timestamp" \
            -H "API-HMAC:$mac" \
            -H "API-FORMAT:json"
    else
        curl -s -k -X PUT $url -d "$data" \
            -H "API-KEY:$cx_apikey" \
            -H "API-REQUEST-DATE:$timestamp" \
            -H "API-HMAC:$mac" \
            -H "API-FORMAT:json"
    fi
}

cxupdate () {
    _type=$1
    _addr=$2
    echo "Update $_type record for $record to $_addr"

    _record=${record/.$domain/}
    data="{\"domain_id\":$zoneid,\"host\":\"${_record}\",\"value\":\"$_addr\",\"type\":\"$_type\",\"ttl\":300,\"line_id\":1}"
    ret=$(_cxapi "record/$recordid" "$data")

    if [[ -z $(echo $ret|grep success) ]]; then
        echo $ret
    else
        echo "OK."
    fi
}

if [[ ! -e $cachef ]]; then
    touch $cachef
fi


domain=$(echo $record |grep -oP "[^.]+\.[^.]+$")
if [[  $(cat $cachef|grep "id,"|wc -l) -eq 2 ]]; then
    recordid=$(cat $cachef|grep "recordid,$do_record"|grep -oP "[a-f\d]{3,}")
    zoneid=$(cat $cachef|grep zoneid|grep -oP "[a-f\d]{3,}")
else
    if [[ $USE = "cloudflare" ]]; then
        ret=$(_cfapi "zones?name=$domain" "")
        zoneid=$(echo $ret|grep -oP "\"id\":\"[a-f\d]{32}"|grep -oP "[a-f\d]{32}"|head -n1)
        ret=$(_cfapi "zones/$zoneid/dns_records?name=$record&type=$do_record" "")
        recordid=$(echo $ret|grep -oP "\"id\":\"[a-f\d]{32}"|grep -oP "[a-f\d]{32}"|head -n1)

        echo "recordid,$do_record,$recordid" >> $cachef
        echo "zoneid,$zoneid" >> $cachef
    else
        ret=$(_cxapi "domain" "")
        zoneid=$(echo $ret|grep -oP "id\":\"\d+\",\"domain\":\"$domain"|grep -oP "\d+"|head -n1)
        _record=${record/.$domain/}
        ret=$(_cxapi "host/$zoneid?host_name=$_record" "")
        _hostid=$(echo $ret|grep -oP "id\":\"\d+\""|grep -oP "\d+"|head -n1)
        ret=$(_cxapi "record/$zoneid?host_id=$_hostid" "")
        recordid=$(echo $ret|grep -oP "id\":\"\d+\""|grep -oP "\d+"|head -n1)

        echo "recordid,$do_record,$recordid" >> $cachef
        echo "zoneid,$zoneid" >> $cachef
    fi
fi

if [[ -z $recordid || -z $zoneid ]]; then
    echo "Unable to get recordid or zoneid"
    rm -f $cachef
    exit 0
fi


if [[ $do_record = "A" ]]; then 
    addr_v4=$(curl ipip.tk/ip -4s)

    if [[ -z $(cat $cachef|grep $addr_v4) ]]; then
        sed -i "/v4,/d" $cachef
        echo "v4,$addr_v4" >> $cachef
        update "A" $addr_v4
    fi
else
    # check if we have ipv6 address

    if [[ -z $(ifconfig $iface|grep inet6|grep -P "2[\da-f:]{4,}") ]]; then exit ; fi

    addr_v6_prefix=$(curl ipip.tk/ip -6s|grep -oP "[\da-f]+:[\da-f]+:[\da-f]+:[\da-f]+"|cut -f1|head -n1 )

    # check if we really can use ipv6
    if [[ -z $addr_v6_prefix ]]; then exit; fi

    addr_v6="$addr_v6_prefix::$v6_suf"

    if [[ -z $(ifconfig $iface|grep $addr_v6) ]]; then
        echo "Adding $addr_v6 to $iface"
        ip -6 addr add $addr_v6/64 dev $iface
    fi


    if [[ -z $(cat $cachef|grep $addr_v6) ]]; then
        sed -i "/v6,/d" $cachef
        echo "v6,$addr_v6" >> $cachef
        update "AAAA" $addr_v6
    fi
fi