NetBSD/etc/netstart

#!/bin/sh -
#
#	$NetBSD: netstart,v 1.30 1997/03/10 09:42:24 mycroft Exp $
#	from: @(#)netstart	8.1 (Berkeley) 7/23/93

# /etc/myname contains my symbolic name
#
hostname=`cat /etc/myname`
hostname $hostname
if [ -f /etc/defaultdomain ]; then
	domainname `cat /etc/defaultdomain`
fi

# install and enable packet filter rules before configuring interfaces.
if [ "$ipfilter" != NO ] && [ -f /etc/ipf.conf ]; then
	echo 'installing packet filter rules ... '
	ipf -f /etc/ipf.conf
fi

# configure all of the interfaces which we know about.
# do this by reading /etc/hostname.* files, where * is the name
# of a given interface.
#
# these files are formatted like the following, but with no # at the
# beginning of the line
#
# addr_family hostname netmask broadcast_addr options
# dest dest_addr
#
# addr_family is the address family of the interface, generally inet
# hostname is the host name that belongs to the interface, in /etc/hosts.
# netmask is the network mask for the interface.
# broadcast_addr is the broadcast address for the interface
# options are misc. options to ifconfig for the interface.
#
# dest is simply the string "dest" (no quotes, though) if the interface
# has a "destination" (i.e. it's a point-to-point link, like SLIP).
# dest_addr is the hostname of the other end of the link, in /etc/hosts
#
# the only required contents of the file are the addr_family field
# and the hostname.

(
    tmp="$IFS"
    IFS="$IFS."
    set -- `echo /etc/hostname*`
    IFS=$tmp
    unset tmp

    while [ $# -ge 2 ] ; do
        shift            # get rid of "hostname"
        (
            read af name mask bcaddr extras
            read dt dtaddr 

            if [ ! -n "$name" ]; then
                echo "/etc/hostname.$1: invalid network configuration file"
                exit
            fi

	    cmd="ifconfig $1 $af $name "
	    if [ "$dt" = dest ]; then cmd="$cmd $dtaddr"; fi
	    if [ -n "$mask" ]; then cmd="$cmd netmask $mask"; fi
	    if [ -n "$bcaddr" ] && [ "$bcaddr" != NONE ]; then
		cmd="$cmd broadcast $bcaddr";
	    fi
	    cmd="$cmd $extras"

	    $cmd
        ) < /etc/hostname.$1
        shift
    done
)

# set the address for the loopback interface
ifconfig lo0 inet localhost

# use loopback, not the wire
route add $hostname localhost

# /etc/mygate, if it exists, contains the name of my gateway host
# that name must be in /etc/hosts.
if [ -f /etc/mygate ]; then
	route add default `cat /etc/mygate`
fi

# /etc/ifaliases, if it exists, contains the names of additional IP
# addresses for each interface. It is formatted as a series of lines
# that contain
#	address interface netmask
if [ -f /etc/ifaliases ]; then
(
	while read addr int net; do
		if [ ! -n "$net" ]; then
			ifconfig $int inet alias $addr
		else
			ifconfig $int inet alias $addr netmask $net
		fi
		route add $addr localhost
	done
) < /etc/ifaliases
fi

if [ -s /etc/netstart.local ]; then
	. /etc/netstart.local
fi