#!/bin/sh

#pragma ident "@(#)linux-check-prereq 1.1 98/09/01"

echo "To run the Mobile IP software, your kernel must support:"
echo "    - the proc file-system"
echo "    - dynamically loadable kernel modules"
echo "    - TCP/IP networking"
echo "    - IP forwarding"
echo "    - IP multicast"
echo "    - IP aliasing"
echo "    - IPinIP tunneling (as a module)"
echo "    - and network devices appropriate for your hardware"

RESULT=1

# Check the /proc file system.
if [ -r /proc/version ] ; then
    echo "Kernel supports the proc filesystem (good)."
else
    echo "Proc filesystem check failed."
    RESULT=0
fi

if [ -r /proc/modules ] ; then
    echo "Kernel supports dynamically loadable modules (good)."
else
    echo "Module support check failed."
    RESULT=0
fi

if [ -r /proc/net/route -a -r /proc/net/arp ] ; then
    echo "Kernel supports TCP/IP networking (good)."
else
    echo "TCP/IP networking check failed."
    RESULT=0
fi

if [ -r /proc/sys/net/ipv4/ip_forward ] ; then
    echo "Kernel supports IP forwarding (good)."
else
    echo "IP forwarding check failed."
    RESULT=0
fi

if [ -r /proc/net/igmp ] ; then
    echo "Kernel supports IP multicast (good)."
else
    echo "IP multicast check failed."
    RESULT=0
fi

if [ -r /proc/net/aliases ] ; then
    echo "Kernel supports IP aliasing (good)."
else
    echo "IP aliasing check failed."
    RESULT=0
fi

if [ -r /sbin/ifconfig -a -r /sbin/route -a -r /sbin/insmod -a -r \
/sbin/rmmod ] ; then
    echo "Found necessary utilities -- ifconfig, route, insmod, rmmod (good)."
else
    echo "One or more of the following -- ifconfig, route, insmod, rmmod -- "
    echo "appear to be missing."
    RESULT=0
fi

/sbin/insmod ipip
COUNT=`more /proc/modules | grep ipip | wc -l`
if [ $COUNT != 0 ] ; then
    echo "Kernel has loadable ipip module (good)."
else
    echo "Kernel does not have a loadable ipip module."
    RESULT=0
fi
/sbin/rmmod ipip

/sbin/insmod -o tunl0 new_tunnel
COUNT=`more /proc/modules | grep tunl0 | wc -l`
if [ $COUNT != 0 ] ; then
    echo "Kernel has loadable new_tunnel module (good)."
else
    echo "Kernel does not have a loadable new_tunnel module."
    RESULT=0
fi
/sbin/rmmod tunl0

if [ $RESULT != 1 ] ; then
    echo "Your kernel is missing some features required by Mobile IP."
else
    echo "Your kernel satisfies the necessary pre-requisities for Mobile IP."
fi