#!/bin/sh

# myIP ver. 1.1 2003.07.15
# scripted by m9841

# MN7310 のログイン名
MN7310_USER=hogehoge
# MN7310 のパスワード
MN7310_PASSWORD=hugahuga
# MN7310 の IP
MN7310=*.*.*.*
# 古い IP を保存しておくファイル
OLD_IP_FILE=old_ipaddress
# ログファイル
LOG_FILE=ipupdate.log
# ログの最大サイズ（バイト）
MAX_LOG_SIZE=100000
# miniDNS の FQDN
miniDNS_HOST=hoge.minidns.net
# miniDNS のログイン名
miniDNS_USER=fugafuga
# miniDNS のパスワード
miniDNS_PASSWORD=gagaga
# miniDNS のログ
miniDNS_LOG=miniDNS.log

# Check the old IP file.
[ -f $OLD_IP_FILE ] || exit 0

# Check the log file.
[ -f $LOG_FILE ] || exit 0

# Check the miniDNS log file.
[ -f miniDNS.log ] || exit 0

# Check the log size
log_size=`wc -c $LOG_FILE | sed s/$LOG_FILE//`
if [ $log_size -ge $MAX_LOG_SIZE ]
then
	echo > $LOG_FILE
fi

# Get IP from MN7310
ipaddress=`wget -t1 -T10 -q -O - http://$MN7310_USER:$MN7310_PASSWORD@$MN7310/cgi-bin/main.cgi?cc_webname=STATUS  | grep 'ADSL IP' | sed -e 's|^<TR><TD NOWARP>ADSL IP</TD><TD NOWARP>:||'  -e 's|</TD><TR><TD NOWARP>Peer IP.*||'`

# Write log
if [ -z $ipaddress ]
then
	echo "`date` cannot get IP from MN7310." >> $LOG_FILE
	exit 1
else
	echo "`date` get IP successful $ipaddress." >> $LOG_FILE
fi

# Read the old IP.
old_ipaddress=`cat $OLD_IP_FILE`

# Compare IP from MN7310 with old IP.
# And change miniDNS record.
if [ "$ipaddress" = "$old_ipaddress" ]
then
	# Do notning
	echo "`date` IP is not changed. Do nothing." >> $LOG_FILE
	exit 0
elif [ "$ipaddress" != "$old_ipaddress" ]
then
	# Change IP
	echo "`date` IP is changed from $old_ipaddress into $ipaddress." >> $LOG_FILE
	echo "$ipaddress" > "$OLD_IP_FILE"
	wget -q -O $miniDNS_LOG "http://www.minidns.net/areg.php?opcode=ADD&username=$miniDNS_USER&password=$miniDNS_PASSWORD&host=$miniDNS_HOST&ip=$ipaddress"
	exit 0
else
	# There is some problems.
	exit 1
fi