#!/bin/sh

helpmsg()
{
	echo "get_ip - determine external IP address"
	echo
	echo "Usage: $0 [option]"
	echo "    -d, --dsld     - use showdsldstat method (use only with kernel 2.6 firmwares)"
	echo "    -e, --extquery - use external site query method"
	echo "    -w, --webcm    - use webcm CGI handler method [default]"
	echo "    -?, --help     - print this help message"
	echo
}

local ip=""
local queryfile="/usr/www/all/html/query.txt"
local querystring=""
local retval=0

case "$1" in
  -d|--dsld)
	ip=$(/sbin/showdsldstat | grep "0: ip" | cut -d\/ -f1 | cut -d ' ' -f3)
	retval=$?
	;;
  -e|--extquery)
	ip=$(wget -q -O - http://checkip.dyndns.org | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+')
	retval=$?
	;;
  ""|-w|--webcm)
	if [ "$(sed -ne '/var:n\[/p' $queryfile)" != "" ]; then
		querystring="var:n[0]=connection0:pppoe:status/ip"
	else
		querystring="var:cnt=1&var:n0=connection0:pppoe:status/ip"
	fi
	ip=$(/usr/www/html/cgi-bin/webcm "getpage=${queryfile}&${querystring}")
    	retval=$?
	;;
  -?|--help)
	helpmsg
	exit 0
	;;
  *)
	helpmsg >&2
	exit 1
esac

if [ $retval == 0 ]; then
	echo "$ip"
	exit 0
fi
echo "get_ip error (exit code $retval)" >&2
exit $retval