ifchk.sh

#!/bin/bash
#============================================================
#
#          FILE:  ifchk
#
#         USAGE:  ./ifchk
#
#   DESCRIPTION: Formated network interface information for better readability. More options
#                          planned to be coded in subsequent releases.
#
#       OPTIONS:  ---
#  REQUIREMENTS:  ---
#          BUGS:  ---
#         NOTES:  Development of this tool is still in progress.
#        AUTHOR:   (tankd),
#       COMPANY: ---
#       VERSION:  1.0
#       CREATED:  10/27/11 01:42:08 PST
#      REVISION:  ---
#============================================================

# Test for root permissions and terminate
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
       exit 1
fi

# Get a list of activated interfaces
ifconfig | grep -E --only-matching '(eth[0-9]+)' >> /tmp/interface.lst
ifconfig | grep -E --only-matching '(wlan[0-9]+)' >> /tmp/interface.lst
ifconfig | grep -E --only-matching '(ppp[0-9]+)' >> /tmp/interface.lst
ifconfig | grep -E --only-matching '(vboxnet[0-9]+)' >> /tmp/interface.lst
ifconfig | grep -E --only-matching '(vmnet[0-9]+)' >> /tmp/interface.lst
ifconfig | grep -E --only-matching '(lo)' >> /tmp/interface.lst

# Create variable $INT from user input
INT=$1

# Test for empty variable $INT and terminate
if [ $INT = "" ]; then
    echo ERROR: No interface specified.
    exit 1
fi

# Test user input against generated interface list
for i in `cat /tmp/interface.lst`; do
        if [ $i = ${INT} ]; then
                STR_CHK=True
                break
        else
                STR_CHK=False
        fi
done

# If user input does not match any interfaces on the list terminate
if [ $STR_CHK = False ]; then
    echo ERROR: Unrecognized interface
        exit 1
fi

# Display all available interfaces
# cat /tmp/interfaces.lst

# Enumerate the interface configuration and set variables
#
# Connection Media
MEDIA=$(ifconfig ${INT} | grep -E --only-matching '(encap\:[A-Za-z]+)' | sed 's/encap[:]//g')

# Inet Address
INET=$(ifconfig ${INT} | grep -E --only-matching '(addr\:)([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)' | sed 's/addr[:]//g')

# MAC Address
MAC=$(ifconfig ${INT} | grep -E --only-matching '([a-z0-9][a-z0-9]\:[a-z0-9][a-z0-9]\:[a-z0-9][a-z0-9]\:[a-z0-9][a-z0-9]\:[a-z0-9][a-z0-9]\:[a-z0-9][a-z0-9])')

# Subnet Mask
MASK=$(ifconfig ${INT} | grep -E --only-matching '(Mask\:)([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)' | sed 's/Mask[:]//g')

# Username
USER=$(whoami)

# Hostname
HOST=$(hostname)

# Display gathered information
echo Interface Information - ${INT}
echo
echo Connection Type - $MEDIA
echo
echo IPv4 - $INET
echo
echo Netmask - $MASK
echo
echo MAC Address - $MAC

# External IP
NAT=$(curl 'http://automation.whatismyip.com/n09230945.asp')

# ARIN Search
WHOIS=$(curl http://whois.arin.net/rest/ip/${NAT}.txt)


# Variables established list
#
# $0*
# $INT
# $MEDIA
# $INET
# $MAC
# $MASK
# $NAT
# $WHOIS


# Test for Linux distro, kernel, and base
DIST=$(cat /etc/*-release | grep 'DISTRIB_ID' | sed 's/DISTRIB\_ID\=//g')
VER=$(cat /etc/*-release | grep 'DISTRIB_RELEASE' | sed 's/DISTRIB\_RELEASE\=//g')
BASE=$(cat /etc/*-release | grep 'DISTRIB_CODENAME' | sed 's/DISTRIB\_CODENAME\=//g')
KERNEL=$(uname -r)

echo 'DISTRO=${DIST}'
echo 'VERSION=${VER}'
echo 'KERNEL=${KERNEL}'
echo 'BASE=${BASE}'