Monitor router open connections in command-line (D-Link DI-604)

nsd.sh

#! /bin/bash

LOGIN="admin"
PWD="password"

# now only for d-link DI-604
URL="http://192.168.0.1/cgi-bin/natp"

BASIC_AUTH=$(echo -n ${LOGIN}:${PWD} | base64)

page=0
line_number=1

echo -e "Num\tProto\t Local Address\t\t Foreign Address\t NAT port\t TTL"
while [ true ]; do
    # XXX: param and url must be set together
    content=$(GET -H "Authorization: Basic ${BASIC_AUTH}" "${URL}?rc=_nstat&pn=$page&rd=nstat")

    # XXX: really?
    $(echo $content | grep -E -q 'UDP|TCP|ICMP')

    if [ $? = 0 ]; then
	# XXX: skip IP:53 (DNS req)
	# Remove html stuff, and add line number
    	echo $content \
	    | sed -e 's/<\/TR>/<\/TR>\n/g' \
	    | sed -ne 's/<TR>//p' \
	    | sed -ne 's/.*<TD>\(.*\)<\/TD> <TD>\(.*\)<\/TD> <TD>\(.*\)<\/TD> <TD>\(.*\)<\/TD> <TD>\(.*\)<\/TD>.*/\2\t \1\t \3\t \4\t\t \5/p' \
	    | nl -n ln -v ${line_number}
 	page=$(($page + 20))
	line_number=$((${line_number} + 19))
    else
	echo "END"
	exit
    fi
done