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Linux Network Configuration

#!/bin/bash
# A Linux Shell script to collect information on your network configuration.
# -------------------------------------------------------------------------
# Copyright (c) 2003 nixCraft project 
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# Last updated: Jun-03-2009
# -------------------------------------------------------------------------
HWINF=/usr/sbin/hwinfo
IFCFG=/sbin/ifconfig
IP4FW=/sbin/iptables
IP6FW=/sbin/ip6tables
LSPCI=/sbin/lspci
ROUTE=/sbin/route
NETSTAT=/bin/netstat
LSB=/usr/bin/lsb_release
 
## files ##
DNSCLIENT="/etc/resolv.conf"
DRVCONF="/etc/modprobe.conf"
NETALIASCFC="/etc/sysconfig/network-scripts/ifcfg-eth?-range?"
NETCFC="/etc/sysconfig/network-scripts/ifcfg-eth?"
NETSTATICROUTECFC="/etc/sysconfig/network-scripts/route-eth?"
SYSCTL="/etc/sysctl.conf"
 
## Output file ##
OUTPUT="network.$(date +'%d-%m-%y').info.txt"
 
## Email info to?? ##
SUPPORT_ID="you@example.com"
 
chk_root(){
	local meid=$(id -u)
	if [ $meid -ne 0 ];
	then
		echo "You must be root user to run this tool"
		exit 999
	fi
}
 
write_header(){
	echo "---------------------------------------------------" >> $OUTPUT
	echo "$@" >> $OUTPUT
	echo "---------------------------------------------------"  >> $OUTPUT
}
 
dump_info(){
	echo "* Hostname: $(hostname)" >$OUTPUT
	echo "* Run date and time: $(date)" >>$OUTPUT
 
	write_header "Linux Distro"
	echo "Linux kernel: $(uname -mrs)" >>$OUTPUT
	$LSB -a >> $OUTPUT	
 
	[ -x ${HWINF} ] && write_header "${HWINF} --network_ctrl"
	[ -x ${HWINF} ] && ${HWINF} --network_ctrl >> $OUTPUT
 
	[ -x ${HWINF} ] && write_header "${HWINF} --isapnp"
	[ -x ${HWINF} ] && ${HWINF} --isapnp >> $OUTPUT
 
	write_header "PCI Devices"
	${LSPCI} -v >> $OUTPUT
 
	write_header "$IFCFG Output"
	$IFCFG >> $OUTPUT
 
	write_header "Kernel Routing Table"
	$ROUTE -n >> $OUTPUT
 
	write_header "Network Card Drivers Configuration $DRVCONF"
	[ -f $DRVCONF ] && grep eth $DRVCONF  >> $OUTPUT || echo "Error $DRVCONF file not found."  >> $OUTPUT
 
	write_header "DNS Client $DNSCLIENT Configuration"
	[ -f $DNSCLIENT ] && cat $DNSCLIENT >> $OUTPUT || echo "Error $DNSCLIENT file not found." >> $OUTPUT
 
	write_header "Network Configuration File"
	for f in $NETCFC
	do
		if [ -f $f ]
		then
			echo "** $f **" >> $OUTPUT
			cat $f >> $OUTPUT
		else
			echo "Error $f not found." >> $OUTPUT
		fi
	done 
 
	write_header "Network Aliase File"
	for f in $NETALIASCFC
	do
		if [ -f $f ]
		then
			echo "** $f **" >> $OUTPUT
			cat $f >> $OUTPUT
		else
			echo "Error $f not found." >> $OUTPUT
		fi
	done 
 
	write_header "Network Static Routing Configuration"
	for f in $NETSTATICROUTECFC
	do
		if [ -f $f ]
		then
			echo "** $f **" >> $OUTPUT
			cat $f >> $OUTPUT
		else
			echo "Error $f not found." >> $OUTPUT
		fi
	done 
 
	write_header "IP4 Firewall Configuration"
	$IP4FW -L -n >> $OUTPUT
 
	write_header "IP6 Firewall Configuration"
	$IP6FW -L -n  >> $OUTPUT
 
	write_header "Network Stats"
	$NETSTAT -s >> $OUTPUT
 
	write_header "Network Tweaks via $SYSCTL"
	[ -f $SYSCTL ] && cat $SYSCTL >> $OUTPUT || echo "Error $SYSCTL not found." >>$OUTPUT
 
	echo "The Network Configuration Info Written To $OUTPUT. Please email this file to $SUPPORT_ID."
        mailx -s "INFO" $SUPPORT_ID < $OUTPUT
}
 
chk_root
dump_info

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