# 2. method 部份請輸入您連接上 Internet 的方法, 有 adsl 與 cable 兩種
#    nicif  部份請輸入連接 ADSL modem 的網路卡裝置代號
#    outif  部份請輸入對外的界面卡
  method="adsl"         # 這裡請輸入 "cable" or "adsl"
  nicif="eth1"          # 如果您使用 cable ，那麼這裡請輸入對外的介面卡
  outif="ppp0"          # 如果您使用 cable ，那麼這裡請輸入對外的介面卡

# 3. 這裡請輸入您要系統幫您寄信出去的 E-Mail
  emailto="root@localhost"

# 4. 您放置此程式的目錄
  basedir="/usr/local/pingcard"
  basefile="$basedir/oldcardIP"

# 5. What jobs is your needed?
#       1. e-mail and re-dial up
#       2. e-mail, re-dial up, and update DNS
#       3. IP share ==> e-mail and update DNS
#       請選擇您需要的服務
  jobs="2"

#######################################################################
# 底下為程式碼，除非您知道 Shell script ，否則底下不要修改！
#====================== DETECT FILES SESSION ==========================
# 1. Detect the lynx package.
  PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
  export PATH
  if [ "$jobs" == "2" ] || [ "$jobs" == "3" ]; then
        which lynx > /dev/null 2>&1
        if [ "$?" != "0" ]; then
                echo "The nessecery package ==> lynx do not install!"
                echo "Please install this package before running this."
                exit 1
        fi
  fi

# 2. Detect the old IP file
  welcome='Welcome to use this program to update your IP to
  www.adsldns.org.  This message is only show you at the first time.
  If you have any problem about this program, and/or you have any
  good ideas for develop this program, please contact with me.
  http://linux.vbird.org'
  if [ ! -f $basefile ]; then
        echo $welcome | mail -s "Welcome using ping_net_card.sh" \
        $emailto
        /bin/touch $basefile
  fi

#######################################################################
#====================== Functions  =====================
# 底下這個函數在取得新舊的 IP 啦！
oldip () {
        oldip=`cat $basefile`
}
getip () {
        ifconfig "$outif" > /dev/null 2>&1
        if [ "$?" == "0" ]; then
                newip=`ifconfig "$outif" | grep 'inet' | \
                      awk '{print $2}' | sed -e "s/addr\://"`
        else
                newip=""
        fi
}

# 底下這個函數在檢驗新舊 IP 是否相同！？
checkip () {
        if [ "$method" == "adsl" ]; then
                adsl-stop  > /dev/null 2>&1
                sleep 3s
                adsl-start > /dev/null 2>&1
        fi
        if [ "$method" == "cable" ]; then
                ifdown $nicif > /dev/null 2>&1
                sleep 3s
                ifup $nicif   > /dev/null 2>&1
        fi
        sleep 3s
}

# 這個函數在將 IP 位址寄給您
mailtoyou () {
        echo $newip | \
        mail -s "The new IP in your $hostname" $emailto
        echo "$newip" > $basefile
}

# 這個函數在更新 DNS 系統
updateforyou () {
        HOST="http://www.adsldns.org:8080/clientupdate.php?\
email=$email&passwd=$password&hostname=$hostname&debug=1&\
forceip=$newip"
        lynx -dump $HOST > /dev/null 2>&1
}

# 這個函數在更新防火牆機制
iptablesrule () {
        [ -f /usr/local/virus/iptables/iptables.rule ] && \
        sh /usr/local/virus/iptables/iptables.rule
}

# 這個函數取得您的 DNS 主機名與 IP 是否相同！
getdnsip () {
        dnsip=`host $hostname | awk '{print $4}'`
}

#
#====================== ONLY EMAIL SESSION jobs 1 =====================
  if [ "$jobs" == "1" ]; then
      # 1. Get the older IP and newer IP
        oldip
        getip
        while [ "$newip" == "" ]
        do
                checkip
                getip
        done

      # 2. compare with older IP and newer IP. And e-mail to you
        if [ "$newip" != "$oldip" ]; then
                mailtoyou       # just mail to you
        fi
        exit 0
  fi

#====================== EMAIL and UPDATE SESSION job 2 ================
  if [ "$jobs" == "2" ]; then
      # 1. Get the older IP and newer IP
        oldip
        getip
        while [ "$newip" == "" ]
        do
                checkip
                getip
        done

      # 2. compare with older IP and newer IP. And e-mail to you
        if [ "$newip" != "$oldip" ]; then
                mailtoyou       # just mail to you
                updateforyou    # just update for you
                sleep 3s
                iptablesrule    # just reflush iptables rule
        fi

      # 3. check if the DNS name == newip
        getdnsip
        if [ "$newip" != "$dnsip" ]; then
                updateforyou    # just update for you
                sleep 3
                iptablesrule    # just reflush iptables rule
        fi
        exit 0
  fi

#====================== SHARE IP MECHANIME job 3 ======================
  if [ "$jobs" == "3" ]; then
      # 1. Get the older IP and newer IP
        oldip
        newip=`lynx -dump "http://www.adsldns.org/login.php?email=$email&passwd=$password"| grep 您好|cut -d":" -f2|sed 's/ .*$//g'`

      # 2. compare with older IP and newer IP. And e-mail to you
        if [ "$newip" != "$oldip" ]; then
                mailtoyou       # just mail to you
                updateforyou    # just update for you
                sleep 3s
                iptablesrule    # just reflush iptables rule
        fi

      # 3. check if the DNS name == newip
        getdnsip
        if [ "$newip" != "$dnsip" ]; then
                updateforyou    # just update for you
                sleep 3
                iptablesrule    # just reflush iptables rule
        fi
        exit 0
  fi