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#!/bin/sh## Name:         dyndnsup# Description:  Auto-update dynamic dns service# Version:      1.0# Author:       Jose V Beneyto, <joberui@eui.upv.es># Depends on:   netcat# checkid:checkid() {        user_id=`id -u`        if [ "$user_id" != "0" ]        then                echo "you need to be root for running this script!" >&2                exit 1        fi}# checkdepends: check dependeciescheckdepends() {        for dep in netcat        do                which $dep >& /dev/null                if [ $? == 1 ]                then                        echo "$dep not found, please install it!" >&2                        exit 1                fi        done}# readconfig:readconfig() {        if [ -f $CONFIG_FILE ]        then                . $CONFIG_FILE                [ "$DYNDNS_SERVER" == "" ] && {echo "DYNDNS_SERVER variable not set!" >&2; exit 1}                [ "$DYNDNS_PROTOCOL" == "" ] && {echo "DYNDNS_PROTOCOL variable not set!" >&2; exit 1}                [ "$DYNDNS_HOSTNAME" == "" ] && {echo "DYNDNS_HOSTNAME variable not set!" >&2; exit 1}                [ "$DYNDNS_IF" == "" ] && {echo "DYNDNS_IF variable not set!" >&2; exit 1}        fi}# chech time:checktime(){        if [ ! -f $CACHE_FILE ]        then                TIME_EXPIRED="yes" # force update        else                last_mod_date=`date +'%y%m%d' -r $CACHE_FILE`                #last_mod_time=`date +'%H%M%S' -r $CACHE_FILE`                current_date=`date +'%y%m%d'`                #current_time=`date +'%H%M%S'`                # check if timer has expired                days_since_last_mod=`expr $current_date - $last_mod_date`                if [ "$days_since_last_mod" -lt "$MAX_TIME" ]                then                        TIME_EXPIRED="no"                else                        TIME_EXPIRED="yes"                fi        fi}# checkip:checkip() {        current_ip=`ifconfig $DYNDNS_IF | grep 'inet addr' | awk '{print $2}' | sed -e 's/.*://'`        if [ ! -f $CACHE_FILE ]        then                echo "ip=$current_ip" > $CACHE_FILE                last_ip="" # force update        else                last_ip=`cat $CACHE_FILE | grep 'ip' | sed 's/ip=//g'`        fi        if [ "$last_ip" == "$current_ip" ]        then                echo "can't update, ip not changed!" >&2                exit 1        else                DYNDNS_IP=$current_ip        fi}# update:update() {        DYNDNS_IP=$1        echo -ne "GET /nic/update?system=$DYNDNS_PROTOCOL&hostname=$DYNDNS_HOSTNAME&myip=$DYNDNS_IP" | netcat -vv $SERVER_DYNDNS 80}# cache fileCACHE_FILE="/var/cache/dyndnsup.cache"# config file# (you can edit this file to overwrite script variables)CONFIG_FILE="/etc/dyndnsup.conf"# script variables# (CONFIG_FILE overwrite them)MAX_TIME="20" # (days)DYNDNS_SERVER="members.dyndns.org"DYNDNS_PROTOCOL="dyndns2"DYNDNS_HOSTNAME="mikeux.dyndns.org"DYNDNS_IP=""DYNDNS_IF="eth0"checkidcheckdependsreadconfigchecktimecheckip[ "$TIME_EXPIRED" == "yes" ] && echo "update!"#updateecho "DYNDNS_SERVER=$DYNDNS_SERVER"echo "DYNDNS_PROTOCOL=$DYNDNS_PROTOCOL"echo "DYNDNS_HOSTNAME=$DYNDNS_HOSTNAME"echo "DYNDNS_IP=$DYNDNS_IP"echo "DYNDNS_IF=$DYNDNS_IF"echo ""exit 0# End of File