namesilo_ddns.sh

#!/bin/bash

# change the domain name and api key with yours.
# get api key from https://www.namesilo.com/account_api.php

domain_name="yours.com"
sub_domain="test"
api_key="37871giolknf47170aws1"

# define domain_name and temp xml file
domain_xml="/tmp/namesilo_domain_list.xml"
domain_txt="/tmp/namesilo_last_ip.txt"
log_path="/tmp/namesilo_ip_update.log"

# combine domain name
if [[ $sub_domain != "" ]];then
    domain_name="$sub_domain.$domain_name"
fi
#echo $domain_name

# check ip status
# get current ip address
check_ip=http://api.ipify.org
current_ip=$(curl -s $check_ip)
if [[ "$current_ip" = "$(cat $domain_txt)" ]]; then
    echo "same public ip and wait for next check"
    exit $?
else
    echo "public ip changed and start the update"
fi

## define variables 
host_type=""
host_name=""
host_ip=""
host_rrid=""

# get dnsListRecords
# https://www.namesilo.com/api_reference.php#dnsListRecords
dns_list_url="https://www.namesilo.com/api/dnsListRecords?version=1&type=xml&key=$api_key&domain=$domain_name"
#echo $dnslist_url

# get xml from namesilo
curl -s "$dns_list_url" > $domain_xml
#cat $domain_name.xml

# split xml file into bash readable format
read_dom ()
{
    local IFS=\>
    read -d \< ENTITY CONTENT
}

# get domain ip, domain record id from xml
while read_dom; do

    if [[ $ENTITY = "record_id" ]]; then
        host_rrid="$CONTENT"
    
    elif [[ $ENTITY = "type" ]]; then
        host_type=$CONTENT
    
    elif [[ $ENTITY = "host" ]]; then
        host_name=$CONTENT
        
    elif [[ $host_type = "A" ]] && [[ $host_name = "$domain_name" ]] && [[ $ENTITY = "value" ]]; then
        host_ip="$CONTENT"
        echo "$host_rrid $host_type $host_name $host_ip " 
        break
    fi
done < $domain_xml

# get history ip address
history_ip=$host_ip
# echo "$current_ip $history_ip"

# update records
# https://www.namesilo.com/api_reference.php#dnsUpdateRecord
dns_update_url="https://www.namesilo.com/api/dnsUpdateRecord?version=1&type=xml&key=$api_key&domain=$domain_name&rrid=$host_rrid&rrhost=$sub_domain&rrvalue=$current_ip&rrttl=3600"
#echo $dns_update_url

if [[ $current_ip = $history_ip ]]; then
    echo $current_ip > $domain_txt  
    echo "$(date): same domain ip record, no need to update" >> $log_path
    
elif [[ $(curl -s "$dns_update_url" | grep -c "success") > 0 ]]; then
#    echo "domain ip changed and update to $current_ip"
    echo $current_ip > $domain_txt 
    echo "$(date): My public IP changed to $current_ip!" >> $log_path

else
    echo "$(date): update failed" >> $log_path
    exit 1
fi
exit $?