Dyndns.sh

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#!/bin/sh

#---------------------------------------------#
#       Simple DYNDNS with MyDNS              #
# by Miljan Karadzic - http://www.miljan.org/ #
#---------------------------------------------#

# Change this to suite your configuration
SUB="subdomain"                                         # Name of your subdomain
DOMAIN="example.com"                                    # Name of your domain
FILE=/usr/local/etc/dyndns.conf                         # File where we to save IP information
                                                        #
SERVER="www.example.com"                                # DNS/Web server
USER="web_user"                                         # Username for web authentication
PASS="web_password"                                     # Password for web authentication
SRV_FOLDER=".secret_folder"                             # Folder with Dynamic DNS script
SRV_FILE="dyndns.php"                                   # Name of PHP Dynamic DNS script
                                                        #
SECRET="some_ultra_mega_giga_secret_string"             # Secret string; this has to be the same as the
                                                        # secret string on the DNS server; you can do
                                                        # md5sum on some random file to generate one

#################################################
#     !!!! DO NOT EDIT BELOW THIS LINE !!!!     #
#################################################
#
# Connectivity check and IP information retrival
/usr/bin/wget --user=${USER} --password=${PASS} -O /tmp/dyndns$$ \
https://${SERVER}/${SRV_FOLDER}/${SRV_FILE}?addr=${SECRET} >/dev/null 2>&1
if [ "$?" = "0" ]; then
        # Check to see if IP is changed
        if [ "x$(/bin/cat ${FILE} 2>/dev/null)" != "x$(/bin/cat /tmp/dyndns$$)" ]; then
                # Change the IP if it is changed
                /usr/bin/wget --user=${USER} --password=${PASS} -O /dev/null \
                "https://${SERVER}/${SRV_FOLDER}/${SRV_FILE}?addr=${SECRET}&sub=${SUB}&domain=${DOMAIN}" \
                >/dev/null 2>&1
                /bin/cat /tmp/dyndns$$ >${FILE}
        fi
fi
rm -f /tmp/dyndns$$