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NET__GetCableModemIP.sh
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NET__GetCableModemIP.sh
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#!/bin/sh
############################################################################################################
############################################################################################################
#
# $Id: NET__GetCableModemIP.sh,v 1.6 2020/10/07 00:58:25 root Exp $
# $Locker: $
# $State: Exp $
# $Date: 2020/10/07 00:58:25 $
#
# Tool for reporting the WAN-facing IP address of the cable modem behind which the computer is operating.
#
############################################################################################################
############################################################################################################
TMP=/tmp/tmp.`basename $0 ".sh" `.$$
INXI=`which inxi`
if [ -n "${INXI}" ]
then
# WAN IP: ...
inxi -Nni -c0 | grep 'WAN IP:' | cut -f2 -d\: | cut -c2-
exit 0
fi
echo "Unable to locate command 'inxi' in PATH." >&2
#
# Strategy is to not rely on only one mechanism which might fail or go offline.
# Instead probe multible and use value based on majority vote.
# Given constantly evolving web services, this program will never remain static.
# IP address is reported on stdout. Failed sources are reported on stderr.
#
Source1()
{
echo "NULL_Source1"
return
ModemIP=`w3m -no-cookie -dump http://whatismyip.com 2>>$TMP.1.err | grep 'Your Public IPv4 is:' | cut -f2 -d\: | awk '{ print $1 }' `
if [ -n "${ModemIP}" ]
then
echo "${ModemIP}"
else
echo "NULL_Source1"
fi
}
Source2()
{
ModemIP=`w3m -no-cookie -dump http://whatismyipaddress.com 2>>$TMP.2.err | sed -e '1,/My IP Address Is/d' | head -2 | tail -1 `
if [ -n "${ModemIP}" ]
then
echo "${ModemIP}"
else
echo "NULL_Source2"
fi
}
Source3()
{
echo "NULL_Source3"
return
ModemIP=`w3m -no-cookie -dump http://ifconfig.me/ip 2>>$TMP.3.err | awk '{ print $1 }' `
if [ -n "${ModemIP}" ]
then
echo "${ModemIP}"
else
echo "NULL_Source3"
fi
}
Source4()
{
ModemIP=`dig +short myip.opendns.com @resolver1.opendns.com 2>>$TMP.4.err`
if [ -n "${ModemIP}" ]
then
echo "${ModemIP}"
else
echo "NULL_Source4"
fi
}
Source5()
{
ModemIP=`wget http://ipecho.net/plain -O - -q 2>>$TMP.5.err; echo `
if [ -n "${ModemIP}" ]
then
echo "${ModemIP}"
else
echo "NULL_Source5"
fi
}
Source6()
{
ModemIP=`curl ipecho.net/plain 2>>$TMP.6.err; echo `
if [ -n "${ModemIP}" ]
then
echo "${ModemIP}"
else
echo "NULL_Source6"
fi
}
Source7()
{
ModemIP=`curl icanhazip.com 2>>$TMP.7.err`
if [ -n "${ModemIP}" ]
then
echo "${ModemIP}"
else
echo "NULL_Source7"
fi
}
Source8()
{
echo "NULL_Source8"
return
curl http://ifconfig.me/all >$TMP.8 2>>$TMP.8.err
ModemIP=`grep \. $TMP.8 | head -1 | awk '{ print $1 }' `
if [ -n "${ModemIP}" ]
then
echo "${ModemIP}"
else
echo "NULL_Source8"
fi
rm -f ${TMP}.8*
}
IP_polling()
{
echo "\t Polling Source1 ..." >&2
Source1 # Need to build a timeout mechanism to prevent process hang
echo "\t Polling Source2 ..." >&2
Source2
echo "\t Polling Source3 ..." >&2
Source3 # Need to build a timeout mechanism to prevent process hang
echo "\t Polling Source4 ..." >&2
Source4
echo "\t Polling Source5 ..." >&2
Source5
echo "\t Polling Source6 ..." >&2
Source6
echo "\t Polling Source7 ..." >&2
Source7
echo "\t Polling Source8 ..." >&2
Source8 # Need to build a timeout mechanism to prevent process hang
}
IP_polling >$TMP
awk '{ print $1 }' ${TMP} >${TMP}.all
sort ${TMP}.all | uniq | grep -v 'NULL' >$TMP.uniq
lines=`wc -l ${TMP}.uniq | awk '{ print $1 }' `
if [ ${lines} -eq 1 ]
then
read IP < $TMP.uniq
else
for item in `cat $TMP.uniq`
do
echo "`grep ${item} $TMP | wc -l | awk '{ print $1 }' ` ${item}"
done | sort -nr | head -1 | awk '{ print $2 }' >$TMP.ip
read IP < $TMP.ip
fi
echo ${IP}
{
echo "Following Sources failed to report IP for the Cable Modem Router:"
grep -v "${IP}" ${TMP}
} | awk '{ printf("\t %s\n", $0 ) }' >&2
exit 0
exit 0
exit 0