#!/bin/sh
#
#  Copyright (c) University of Cambridge, 1993-1996
#  See the file NOTICE for conditions of use and distribution.
#
# Written to simply set the IP stuff up from the
# bootpc data.
#
# Last updated : Mon Sep 23 16:18:30 1996
#  Jon Peatfield
#
# with modifications as suggested by Austin Donnelly, Chris Hall,
# Donal K Fellows and choltje@ux1.cso.uiuc.edu.
#
# Setup of hosts file modified as suggested by Carl Olson
# <c-olson@uiuc.edu> to get the local IP address right when using some
# resolver options...
#
# $Revision: 1.7 $
#
# Release Version 0.64
#set -x

## The following options are policy decisions you may want to choose
## for the machines on your site.  i.e. if you don't edit it you get
## what I use!   -- Jon

# If you prefer FQDN names rather than leafnames set to 'y';
# This causes the code to ignore the HOSTNAME returned by the BOOTP
# server and do a gethostbyname() on the IP number we were given.
# This will only work if the resolver can be set up or you have the
# correct entry in /etc/hosts (!)
FORCEFQDN='y'

# If you want to add any extra options to ifconfig (e.g. pointopoint)
# The first is used before the bootp the 2nd afterwards and is
# expanded using `eval echo ${IFCONFOPTS2}` so will expand variables
# then (when they are known) not now.
##IFCONFOPTS1='mtu 400 pointopoint'
##IFCONFOPTS2='mtu 400 pointopoint $SERVER'

# Put search not domain line in resolv.conf for 4.9.3 based resolver
# code (still works with older code too) if you like the old 4.8.3
# search rules with the new resolver code then set to 'y'
MAKESEARCH='y'

## YOU MAY NEED TO EDIT THESE FOR DIFFERENT DISTRIBUTIONS
# Location of the bootpc program
BOOTPC=/usr/local/sbin/bootpc
# location of ifconfig
IFCONFIG=/sbin/ifconfig
# location of route
ROUTE=/sbin/route
# location of hostname binary
BINHOST=/bin/hostname

## Details of bootp to perform
# What device to do the bootp on
DEV=eth0

# What address to send bootp request to (broadcast by default)
ASKSERVER="255.255.255.255"

# To set the time we are willing to wait for a reply (roughly)
# This defaults to 70 seconds anyway in the code.
TW="--timeoutwait 70"

# If you want bootpc to exit on failure and take down networking then
# uncomment these line:
RIF="--returniffail"
RIFMESSAGE="Bootp failed -- disabling network."

## Shouldn't change location, but...
# The location of the resolver config file
RCONF=/etc/resolv.conf
# location of the hosts file
EHOSTS=/etc/hosts
# location of the local hosts file..
LHOSTS=/etc/hosts.local

## Location of tmp file for storing options
TMPFILE=/tmp/bootp-results.$$

# For testing purposes I uncomment these They probably arn't usefult
# to you.  -- Jon
#BOOTPC=./bootpc
#IFCONFIG='echo ifconfig'
#ROUTE='echo route'
#BINHOST='echo hostname'
#RCONF=/tmp/resolv.conf
#EHOSTS=/tmp/hosts
#LHOSTS=/dev/null
#ASKSERVER="131.111.255.255"
#TW="--timeoutwait 20"
## This will fail when testing as we reply to our own PING...
#set -x

## Start of the functions
# Stick the nameserver lines in the resolver file.
setservers() {
# Insert the DNS servers themselves
  for i in $1
  do
    echo "nameserver $i" >> ${RCONF}
  done
}

# A function for setting the DNS stuff if we have all the info
setresolv() {
  [ -f ${RCONF} ] && mv -f ${RCONF} ${RCONF}.old
# Insert provided information
  if [ "${MAKESEARCH}" = 'y' ]; then
    echo "search $2" > ${RCONF}
  else
    echo "domain $1" > ${RCONF}
  fi
  setservers "$3"
}

# A function for setting the DNS stuff if we don't know out domainname
fakeresolv() {
  [ -f ${RCONF} ] && mv -f ${RCONF} ${RCONF}.fake
# This means nothing, but provides a domain line (some(old) revolvers
#  break if there isn't one present.)
  echo "domain ." > ${RCONF}
  setservers "$1"
}

# And putting the original back if it exists
unfakeresolv() {
  [ -f ${RCONF}.fake ] && mv -f ${RCONF}.fake ${RCONF}
}

# update the DNSSERVERS but not the domainname, in case of
# reverse lookup failure.
updateresolv() {
  [ -f ${RCONF} ] && mv -f ${RCONF} ${RCONF}.old
# Copy over the domainname from the old file
  egrep 'domain|search' ${RCONF}.old > ${RCONF}
  setservers "$1"
}

# Remove the networking by taking down the interface
netdown() {
  ${ROUTE} del default
  ${IFCONFIG} ${DEV} down
}
## End of the functions

## Start of the actual work
# Bring up minimal networking use 0.0.0.0 as our address as we don't
# know it yet (Means "Me but I don't know my address or network")
${IFCONFIG} ${DEV} up ${IFCONFOPTS1} 0.0.0.0
${ROUTE} add default dev ${DEV}

# Perform the bootp  --  doesn't return unless it gets an answer
if ${BOOTPC} --dev ${DEV} --server ${ASKSERVER} ${RIF} ${TW} > ${TMPFILE}
then
# Take down networking (use the 0.0.0.0 for as short a time as possible)
  netdown
# Read in the values   
  eval `cat ${TMPFILE}`
# And delete the temporary file
  rm ${TMPFILE}
else
# Take down networking (use the 0.0.0.0 for as short a time as possible)
  netdown
# give message and quit
  echo ${RIFMESSAGE}
  exit 1
fi

# Only SERVER and IPADDR are guarenteed by the bootp (assuming
# It works), so check the rest.

# Start the loopback interface and add a route to it
${IFCONFIG} lo 127.0.0.1
${ROUTE} add -net 127.0.0.0

# Setup of IP stuff needs doing first
#
if [ -z "${NETMASK}" ] ; then
# No netmask info, all this is guessed from the IP number
# If this is wrong for your network FIX the bootpd to know
# what it should send in the RFC1497 cookie!  11/02/94 JSP
#
  ${IFCONFIG} ${DEV} up ${IPADDR} broadcast ${BROADCAST} `eval echo ${IFCONFOPTS2}`
  ${ROUTE} -n add -net ${NETWORK} dev ${DEV}
else
# We will have NETMASK, BROADCAST, and NETWORK defined 
  ${IFCONFIG} ${DEV} up ${IPADDR} broadcast ${BROADCAST} netmask ${NETMASK} `eval echo ${IFCONFOPTS2}`
  ${ROUTE} -n add -net ${NETWORK} dev ${DEV}
fi

# Gateways need IP to be able to add the (primary) route.
#
if [ -z "${GATEWAYS}" ] ; then
# No gateways defined
  echo "No IP gateways defined in rc.bootp setup"
else
# First one listed is supposedly our best, so only use it.
  ( set - ${GATEWAYS} ; ${ROUTE} add default gw ${1} )
fi

# May need Gateways if the DNS servers are on the other side of the
# gateways, this needs IP to be up.
#
# Can we set up DNS?
if [ ! -z "${DNSSRVS}" ]; then
  if [ ! -z "${DOMAIN}" ]; then
    setresolv "${DOMAIN}" "${SEARCH}" "${DNSSRVS}" 
  else
# At least we have DNS, so use reverse lookup to get the information
# Fake the resolver setup to do the reverse lookup.
    fakeresolv "${DNSSRVS}" 
    eval `${BOOTPC} --in2host ${IPADDR}`
    unfakeresolv
    if [ ! -z "${HOSTDOMAIN}" ]; then
# Got a domain, so use it
      setresolv "${HOSTDOMAIN}" "${HOSTSEARCH}" "${DNSSRVS}"
    else
# We have DNSSRVS but no DOMAIN, and reverse lookup failed
# If the resolver file is there use it's domainname
      if [ -f ${RCONF} ] ; then
	echo "Using old value from /etc/resolve.conf for domain/search"
	updateresolv "${DNSSRVS}"
      else
        echo "No BOOTP DOMAIN supplied"
	echo "  reverse lookup failed"
	echo "  and no existing resolver file"
	echo "=>   resolver setup failed"
      fi
    fi
  fi
else
  echo "No DNSSRVS supplied, resolver setup not possible"
fi

# May need DNS lookups if not provided by bootpd
#
# Set the hostname from what we got via bootp or reverse lookup

echo "127.0.0.1	loopback localhost">${EHOSTS}

if [ ! -z "${HOSTNAME}" -a "${FORCEFQDN}" != 'y' ]; then
  ${BINHOST} "${HOSTNAME}"
  echo "${IPADDR}	${HOSTNAME}" >>${EHOSTS}
else
  if [ -z "${DONEIN2HOST}" ] ; then
    eval `${BOOTPC} --in2host ${IPADDR}`
  fi
  if [ -z "${FORCEFQDN}" ]; then
# Use the leafname from the result
    if [ ! -z "${HOSTLEAF}" ]; then
      ${BINHOST} "${HOSTLEAF}"
      echo "${IPADDR}	${HOSTLEAF} ${HOSTFULL}">>${EHOSTS}
    fi
  else
# Use the FQDN from the result
    if [ ! -z "${HOSTFULL}" ]; then
      ${BINHOST} "${HOSTFULL}"
      echo "${IPADDR}	${HOSTFULL} ${HOSTLEAF}">>${EHOSTS}
    fi
  fi
fi
#
# And add the local hosts file (if any in too)
#
if [ -f ${LHOSTS} ]; then
  cat ${LHOSTS} >> ${EHOSTS}
fi

# None of this is relevant to IP startup but may be handy for some people
#
# Tell them about other info we got back, but don't use it
# 'cos I'm too lazy to write code for this...
#
# Print out a value if present  JSP
printifhere() {
  [ ! -z "$2" ] && echo "$1 = $2"
}

printifhere	TIMESRVS	"${TIMESRVS}"
printifhere	IEN116SRVS	"${IEN116SRVS}"
printifhere	LOGSRVS		"${LOGSRVS}"
printifhere	QODSRVS		"${QODSRVS}"
printifhere	LPRSRVS		"${LPRSRVS}"
printifhere	IMPRESSSRVS	"${IMPRESSSRVS}"
printifhere	RLPSRVS		"${RLPSRVS}"
printifhere	SWAPSRVR	"${SWAPSRVR}"
printifhere	BOOTFILE	"${BOOTFILE}"
printifhere	TIMEOFFSET	"${TIMEOFFSET}"
printifhere	BOOTSIZE	"${BOOTSIZE}"
printifhere	YPDOMAIN	"${YPDOMAIN}"
printifhere	YPSRVR		"${YPSRVR}"
printifhere	NTPSRVS		"${NTPSRVS}"


#
#
## End of the main work