config root man

#!/bin/sh
#-
# Copyright (c) 2011 Nathan Whitehorn
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD: release/9.1.0/usr.sbin/bsdinstall/scripts/netconfig_ipv4 225612 2011-09-16 09:37:13Z nwhitehorn $

: ${DIALOG_OK=0}
: ${DIALOG_CANCEL=1}
: ${DIALOG_HELP=2}
: ${DIALOG_EXTRA=3}
: ${DIALOG_ITEM_HELP=4}
: ${DIALOG_ESC=255}

INTERFACE=$1
IFCONFIG_PREFIX="$2"
test -z "$IFCONFIG_PREFIX" || IFCONFIG_PREFIX="$2 "
case "${INTERFACE}" in
"")	dialog --backtitle 'FreeBSD Installer' --title 'Network Configuration' \
	    --msgbox 'No interface specified for IPv4 configuration.' 0 0
	exit 1
	;;
esac

dialog --backtitle 'FreeBSD Installer' --title 'Network Configuration' --yesno 'Would you like to use DHCP to configure this interface?' 0 0
if [ $? -eq $DIALOG_OK ]; then
	echo ifconfig_$INTERFACE=\"${IFCONFIG_PREFIX}DHCP\" >> $BSDINSTALL_TMPETC/._rc.conf.net

	if [ ! -z $BSDINSTALL_CONFIGCURRENT ]; then
		dialog --backtitle 'FreeBSD Installer' --infobox "Acquiring DHCP lease..." 0 0
		dhclient $INTERFACE 2>> $BSDINSTALL_LOG
		if [ $? -ne 0 ]; then
			dialog --backtitle 'FreeBSD Installer' --msgbox "DHCP lease acquisition failed." 0 0
			exec $0 ${INTERFACE} "${IFCONFIG_PREFIX}"
		fi
	fi
	exit 0
fi

IP_ADDRESS=`ifconfig $INTERFACE inet | awk '/inet/ {printf("%s\n", $2); }'`
NETMASK=`ifconfig $INTERFACE inet | awk '/inet/ {printf("%s\n", $4); }'`
ROUTER=`netstat -rn -f inet | awk '/default/ {printf("%s\n", $2);}'`

exec 3>&1
IF_CONFIG=$(dialog --backtitle 'FreeBSD Installer' --title 'Network Configuration' --form 'Static Network Interface Configuration' 0 0 0 \
	'IP Address' 1 0 "$IP_ADDRESS" 1 20 16 0 \
	'Subnet Mask' 2 0 "$NETMASK" 2 20 16 0 \
	'Default Router' 3 0 "$ROUTER" 3 20 16 0 \
2>&1 1>&3)
if [ $? -eq $DIALOG_CANCEL ]; then exit 1; fi
exec 3>&-

echo $INTERFACE $IF_CONFIG | 
    awk -v prefix="$IFCONFIG_PREFIX" '{
	printf("ifconfig_%s=\"%s inet %s netmask %s\"\n", $1, prefix, $2, $3);
	printf("defaultrouter=\"%s\"\n", $4);
    }' >> $BSDINSTALL_TMPETC/._rc.conf.net

if [ ! -z $BSDINSTALL_CONFIGCURRENT ]; then
	. $BSDINSTALL_TMPETC/._rc.conf.net
	ifconfig $INTERFACE `eval echo \\\$ifconfig_$INTERFACE`
	if [ -n "${defaultrouter}" ]; then
		route delete -inet default
		route add -inet default $defaultrouter
	fi
fi