Dynamic DNS endpoint IP address update script with Mikrotik router

functions.sh

#!/bin/bash

function snmpGetIP
{   
    local SNMP_HOST=$1
    local SNMP_COMM=$2
    local SNMP_IFID=$3
    
    snmpwalk -Os -c ${SNMP_COMM} -v 2c ${SNMP_HOST} ipAdEntIf | grep "INTEGER: ${SNMP_IFID}" | grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}'
}

function cfGetZone
{   
    curl -sX "GET" "https://api.cloudflare.com/client/v4/zones/" \
    -H "X-Auth-Key: ${cfSecret}" \
    -H "Content-Type: application/json" \
    -H "X-Auth-Email: ${cfLogin}" -o ${TEMP_DIR}/zone.json
}

function cfGetZoneId
{   
    cfDomain=$1
    jq -r '.result[]|select(.name=="'${cfDomain}'")|.id' \
    $TEMP_DIR/zone.json
}

function cfGetRecords
{   
    cfZoneId=$1
    curl -sX GET "https://api.cloudflare.com/client/v4/zones/${cfZoneId}/dns_records?type=A" \
        -H "X-Auth-Email: ${cfLogin}" \
        -H "X-Auth-Key: ${cfSecret}" \
        -H "Content-Type: application/json" \
        -o $TEMP_DIR/records.json
}

function cfGetRecordId
{   
    local recName=$1
    jq -r ".result|.[]|select(.name == \"${recName}.${cfDomain}\")|.id" $TEMP_DIR/records.json
}

function cfPushRecord
{
    local cfZoneId=$1
    local cfRecordId=$2
    local recName=$3
    local recVal=$4
    t_exec=$(date -u +%s)
    validateStr=$t_exec\ \#$(sha1sum <<< $t_exec|cut -c-8)

    curl -sX "PUT" "https://api.cloudflare.com/client/v4/zones/${cfZoneId}/dns_records/${cfRecordId}" \
        -H "X-Auth-Key: ${cfSecret}" \
        -H "Content-Type: application/json" \
        -H "X-Auth-Email: ${cfLogin}" \
        -d "{\"type\":\"A\",\"name\":\"$recName\",\"content\":\"$recVal\",\"proxied\":false,\"ttl\":120}" \
        -o $TEMP_DIR/result.json
    echo $validateStr
}

function cfPushTxtRecord
{
    local cfZoneId=$1
    local cfRecordId=$2
    local recName=$3
    local recVal=$4

    curl -sX "PUT" "https://api.cloudflare.com/client/v4/zones/${cfZoneId}/dns_records/${cfRecordId}" \
        -H "X-Auth-Key: ${cfSecret}" \
        -H "Content-Type: application/json" \
        -H "X-Auth-Email: ${cfLogin}" \
        -d "{\"type\":\"TXT\",\"name\":\"$recName\",\"content\":\"$recVal\",\"proxied\":false,\"ttl\":120}" \
        -o $TEMP_DIR/txt.json
}

function cleanUp
{
    rm -rf ${TEMP_DIR}
}

update.sh

#!/usr/bin/env bash

# Dynamic DNS endpoint IP address update script with Mikrotik
# This script uses ssh to get IP address from Mikrotik router
# The hostname(subdomains) parts has to be stored as global
# variables FIRST.
# 
# To setup on a Mikrotik:
# https://gist.github.com/methou/f9622e6cc15b5055096e
# 

# only current user can rw intermediate files genereated by this script
umask 066

# CloudFlare Configuration
# Secret
tkn=<api key>

# cloudflare login, must be an email address
email=<email address>
# domain name, naked.
domain=<domain name>
# subdomains, please remember set up on the Mikrotik router side
# e.g. subdomains=("a01" "a02" "a03" "a04")
# for a01.example.org etc.
subdomains=<an array of subdomains>
# Router Configuraion
mikrotikHost="192.168.88.1"
# SSH Port number
PORT=22

TEMP_DIR=$(mktemp -d) # create a temp only us can rw from/to

# source functions
. ./functions.sh

# int main(){ ... }
NUM_CHG=0
# compare first IP
for i in $(seq ${#cfRecordNames[*]}); do
    sampleIpAddr=$(snmpGetIP ${mkHostIp} ${mkSnmpCommunity} ${mkSnmpIfId[$i-1]})
    recordIpAddr=$(dig @$nameServer +adflag +short ${cfRecordNames[i-1]}.$cfDomain)
    # echo -e "${mkSnmpIfId[i-1]}:\t rec:${recordIpAddr}\tsampled:${sampleIpAddr}"
    if [[ ${sampleIpAddr} == ${recordIpAddr} ]]; then
        echo -e "(${cfRecordNames[i-1]}: NOCHG, no need to update)"
    else
    ((NUM_CHG+=1))
    fi
done

#echo $NUM_CHG

if [ ${NUM_CHG} -ge 1 ] || [[ ${1:-auto} != "auto" ]] ; then
exit 1
echo "Mismatch found, updating..."

cfGetZone
zoneId=$(cfGetZoneId ${cfDomain})
cfGetRecords ${zoneId}
for i in $(seq ${#cfRecordNames[*]}); do
    thisRecId=$(cfGetRecordId ${cfRecordNames[i-1]})
    #thisTxtRecId=$(cfGetRecordId _${cfRecordNames[i-1]})
    thisIpAddr=$(snmpGetIP ${mkHostIp} ${mkSnmpCommunity} ${mkSnmpIfId[i-1]})
    thisFqdn=${cfRecordNames[i-1]}\.${cfDomain};
    validateStr=$(cfPushRecord ${zoneId} ${thisRecId} ${cfRecordNames[i-1]} ${thisIpAddr})
    #cfPushTxtRecord ${zoneId} ${thisTxtRecId} _${cfRecordNames[i-1]} "${validateStr}"
done
cleanUp
else
   exit -1
   echo "(All NOCHG: no need to update at all)"
fi

update.sh functions.sh and hostIp.func.rsc, the three seem to have no connection, how to use? There are no common global variable between them.