NetBSD/etc/netstart

#!/bin/sh -
#
#	$NetBSD: netstart,v 1.45 1997/09/07 09:47:31 mycroft Exp $
#	from: @(#)netstart	8.1 (Berkeley) 7/23/93

if [ -f /etc/rc.subr ]; then
	. /etc/rc.subr
else
	echo "Can't read /etc/rc.subr; aborting."
	exit 1;
fi

if [ -f /etc/rc.conf ]; then
	. /etc/rc.conf
fi

# If $hostname is set, use it for my symbolic name, otherwise use /etc/myname
if [ -z "$hostname" -a -f /etc/myname ]; then
	hostname=`cat /etc/myname`
fi
if [ -n "$hostname" ]; then
	echo "hostname: $hostname"
	hostname $hostname
fi

# Check $domainname first, then /etc/defaultdomain, for domain name
if [ -z "$domainname" -a -f /etc/defaultdomain ]; then
	domainname=`cat /etc/defaultdomain`
fi
if [ -n "$domainname" ]; then
	echo "domainname: $domainname"
	domainname $domainname
fi

# Flush all routes just to make sure it is clean
if [ "$flushroutes" = YES ]; then
	route flush
fi

# Enable, flush and install packet filter rules before configuring interfaces.
if checkyesno ipfilter; then
	if [ -f /etc/ipf.conf ]; then
		echo 'installing packet filter rules ... '
		ipf -E -Fa -f /etc/ipf.conf
	else
		logger -s "WARNING: /etc/ipf.conf not readable " \
		    "ipfilter not started."
		# abort the boot rather than risk a security problem
		exit 1;
	fi
fi

# Set the address for the first loopback interface, so that the auto-route
# from a newly configured interface's address to lo0 works correctly.
ifconfig lo0 inet 127.0.0.1

# Configure all of the network interfaces listed in $net_interfaces;
# if $net_interfaces is DEFAULT, grab all interfaces from ifconfig.
# In the following, "xxN" stands in for interface names, like "le0".
# For any interfaces that has an $ifconfig_xxN variable associated,
# we do "ifconfig xxN $ifconfig_xxN".
# If there is no such variable, we take the contents of the file
# /etc/ifconfig.xxN, and run "ifconfig xxN" repeatedly, using each
# line of the file as the arguments for a seperate "ifconfig" invocation.
#
# In order to configure an interface reasonably, you at the very least
# need to specify "[addr_family] [hostname]" (as in "inet my.domain.org"),
# and probably a netmask (as in "netmask 0xffffffe0"). You will
# frequently need to specify a media type, as in "media UTP", for
# interface cards with multiple media connections that do not autoconfigure.
# see the ifconfig manual page for details.

if [ "$net_interfaces" != NO ]; then
	if checkyesno auto_ifconfig; then
		tmp="`ifconfig -l`"
	else
		tmp="$net_interfaces"
	fi
	echo -n 'configuring network interfaces:'
	for int in $tmp; do
		eval `echo 'args=$ifconfig_'$int`
		if [ -n "$args" ]; then
			echo -n " $int"
			ifconfig $int $args
		elif [ -f /etc/ifconfig.$int ]; then
			echo -n " $int"
			(while read args; do
				ifconfig $int $args
			done) < /etc/ifconfig.$int
		else
			if [ "$auto_ifconfig" != YES ]; then
				echo
				echo "WARNING: /etc/ifconfig.$int missing " \
				    "and ifconfig_$int not set; " \
				    "interface $int not configured."
			fi
			continue
		fi
		configured_interfaces="$configured_interfaces $int"
	done
	echo '.'
fi

# Check $defaultroute, then /etc/mygate, for the name of my gateway host.
# That name must be in /etc/hosts.
if [ -z "$defaultroute" -a -f /etc/mygate ]; then
	defaultroute=`cat /etc/mygate`
fi
if [ -n "$defaultroute" ]; then
	route add default $defaultroute
fi

# Check if each configured interface xxN has an $ifaliases_xxN variable
# associated, then configure additional IP addresses for that interface.
# The variable contains a list of "address netmask" pairs, with "netmask"
# set to "-" if the interface default netmask is to be used.
# 
if [ -n "$configured_interfaces" ]; then
	echo 'adding interface aliases:';
fi
for int in $configured_interfaces; do
	eval `echo 'args=$ifaliases_'$int`
	if [ -n "$args" ]; then
		set -- $args
		while [ $# -ge 2 ]; do
			addr=$1 ; net=$2 ; shift 2
			if [ "$net" = "-" ]; then
				ifconfig $int inet alias $addr
			else
				ifconfig $int inet alias $addr netmask $net
			fi
			# Use loopback, not the wire
			route add $addr 127.0.0.1
		done
	fi
done

# /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
	echo 'adding interface aliases:';
(
	while read addr int net; do
		if [ -z "$net" ]; then
			ifconfig $int inet alias $addr
		else
			ifconfig $int inet alias $addr netmask $net
		fi
		# use loopback, not the wire
		route add $addr 127.0.0.1
	done
) < /etc/ifaliases
fi

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