initial commit

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diff --git a/s2_networking.sh b/s2_networking.sh
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+#!/bin/bash
+# File: /root/s2_networking.sh
+# Package: deployscripts
+# Author: bgstack15
+# Startdate: 2015
+# Title: Template Script 2: Networking
+# Purpose: Set initial hard-coded network settings
+# History: 2016-07-28 given initial headers
+# Usage: ./s2[tab][enter]
+# Reference:
+# Improve:
+
+eval flavor=$( grep -iE "^\s*ID=" /etc/os-release 2>/dev/null | sed 's/^.*=//;' )
+if test -z "${flavor}"; then test "$( uname -s )" = "FreeBSD" && flavor=freebsd; fi
+
+# interactive:
+#macaddr=$( ip link show | grep ether | awk '{print $2}' )
+macaddr=$( ifconfig | grep -oIE "(ether|HWaddr)\>.*\>" | awk '{print $2}' )
+printf 'IP address: '; read thisip
+echo ${thisip} | grep -qiE "^([0-9]{1,3}\.){3}[0-9]{1,3}" || { echo "Invalid IP. Aborted."; exit 1; }
+defgateway=${thisip%.*}.254
+printf "Gateway [${defgateway}]: "; read thisgateway
+[[ -z ${thisgateway} ]] && thisgateway=${defgateway}
+echo ${thisgateway} | grep -qiE "^([0-9]{1,3}\.){3}[0-9]{1,3}" || { echo "Invalid gateway. Aborted."; exit 1; }
+
+#build other components
+_netmask="255.255.255.0" #class c, or CIDR /24. Good enough for the example default.
+_network="${thisip%.*}.0"
+_broadcast="${thisip%.*}.255"
+
+case "${flavor}" in
+   centos)
+      netfile=/etc/sysconfig/network-scripts/.template
+      tmpfile=/tmp/netfile1
+      outfile=/etc/sysconfig/network-scripts/ifcfg-eth0
+      
+      sed "s/HWADDR=.*/HWADDR=\"${macaddr}\"/;" ${netfile} > ${tmpfile}
+      cat <<EOF >> ${tmpfile}
+IPADDR=${thisip}
+NETMASK=255.255.255.0
+GATEWAY=${thisgateway}
+EOF
+      
+      chmod --reference ${netfile} ${tmpfile}
+      mv -f ${tmpfile} ${outfile}
+      rm -f /etc/sysconfig/network-scripts/ifcfg-eno*
+      systemctl restart network.service
+      ;;
+   ubuntu)
+      netfile=/etc/network/interfaces.example
+      tmpfile=/tmp/netfile1
+      outfile=/etc/network/interfaces
+
+      sed "s/THISIP/${thisip}/;s/THISNETMASK/${_netmask}/;s/THISNETWORK/${_network}/;s/THISBROADCAST/${_broadcast}/;s/THISGATEWAY/${thisgateway}/;" ${netfile} > ${tmpfile}
+      chmod --reference ${outfile} ${tmpfile} 2>/dev/null
+      mv -f ${tmpfile} ${outfile}
+      ifdown -a
+      ifup -a
+
+      # Firewall rules, since ufw is disabled by default per https://help.ubuntu.com/16.04/serverguide/firewall.html
+      ufw enable
+      ufw allow ssh
+      ;;
+   freebsd)
+      netfile=/etc/rc.conf.example
+      tmpfile=/tmp/netfile1
+      outfile=/etc/rc.conf
+      sed "s/^ifconfig_em0=.*\$/ifconfig_em0=\"inet ${thisip} netmask ${_netmask}\"/;s/^defaultrouter=.*/defaultrouter=\"${thisgateway}\"/;" ${netfile} > ${tmpfile}
+      cp -p ${tmpfile} ${outfile} 
+      /etc/rc.d/netif restart
+      ;;
+   *)
+      echo "$0: Error 1. OS cannot be determined from /etc/os-release. Aborted." 1>&2
+      exit 1
+      ;;
+esac
+
+echo "Please reboot (telinit 6)."