NetBSD/etc/netstart

#!/bin/sh -
#
#	$NetBSD: netstart,v 1.74 2000/02/13 07:47:26 itojun 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 $hostname is set, use it for my Internet name, otherwise use /etc/myname
if [ -z "$hostname" -a -f /etc/myname ]; then
	hostname=`cat /etc/myname`
fi
if [ -n "$hostname" ]; then
	echo "hostname: $hostname"
	hostname $hostname
fi

# Check $domainname first, then /etc/defaultdomain, for NIS/YP domain name
if [ -z "$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 checkyesno flushroutes; then
	route -n 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
		echo
		echo "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.
#
# NOTE: obscure networking problems may occur if lo0 isn't configured...
#
ifconfig lo0 inet 127.0.0.1

# Configure all of the network interfaces listed in $net_interfaces;
# if $auto_ifconfig is YES, 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 $ifconfig_xxN".
# If there is no such variable, we take the contents of the file
# /etc/ifconfig.xxN, and run "ifconfig xxN" repeatedly, using each
# line of the file as the arguments for a seperate "ifconfig" invocation.
#
# In order to configure an interface reasonably, you at the very least
# need to specify "[addr_family] [hostname]" (as in "inet my.domain.org"),
# and probably a netmask (as in "netmask 0xffffffe0"). You will
# frequently need to specify a media type, as in "media UTP", for
# interface cards with multiple media connections that do not autoconfigure.
# see the ifconfig manual page for details.
#
# Note that /etc/ifconfig.xxN takes multiple lines.  The following
# configuration is possible:
#	inet 10.1.1.1 netmask 0xffffff00
#	inet 10.1.1.2 netmask 0xffffff00 alias
#	inet6 fec0::1 prefixlen 64 alias
#
if [ "$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 " $int"
			(while read args; do
				if [ -n "`eval echo '$args'`" ] ; then
					ifconfig $int $args
				fi
			done) < /etc/ifconfig.$int
		else
			if ! checkyesno auto_ifconfig; 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.
#
# Note that $ifaliases_xxN works only with certain configurations and
# considered not recommended.  Use /etc/ifconfig.xxN if possible.
# 
if [ -n "$configured_interfaces" ]; then
	echo 'adding interface aliases:';
	done_aliases_message=yes
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
#
# Note that /etc/ifaliases works only with certain cases only and considered
# not recommended.  Use /etc/ifconfig.xxN instead.
#
if [ -f /etc/ifaliases ]; then
(
	if [ "$done_aliases_message" != yes ]; then
		echo 'adding interface aliases:';
	fi
	while read addr int net; do
		if [ -z "$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

# /etc/ppp/peers and $ppp_peers contain boot configuration information
# for pppd.  each value in $ppp_peers that has a file in /etc/ppp/peers
# of the same name, will be run as `pppd <peer>'.
if [ -n "$ppp_peers" ]; then
	# pppd is in /usr - need to ensure it is mounted
	mount /usr >/dev/null 2>&1	
	set -- $ppp_peers
	echo -n "starting pppd:"
	while [ $# -ge 1 ]; do
		peer=$1; shift
		if [ -f /etc/ppp/peers/$peer ]; then
			pppd call $peer
			echo -n " $peer"
		fi
	done
	echo "."
fi

if checkyesno dhclient; then
	echo -n "starting dhcp client...";
	dhclient $dhclient_flags
fi

# IPv6
# Note that manual configuration can be done in the above, using ifconfig.
if ifconfig lo0 inet6 >/dev/null 2>&1; then
	# We have IPv6 support in kernel.

	# disallow scoped unicast dest without outgoing scope identifiers.
	route add -inet6 fe80:: -prefixlen 10 ::1 -reject
	route add -inet6 fc80:: -prefixlen 10 ::1 -reject

	# disallow "internal" addresses to appear on the wire.
	route add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject
	route add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject

	sysctl -w net.inet6.ip6.forwarding=0 >/dev/null
	sysctl -w net.inet6.ip6.accept_rtadv=0 >/dev/null

	# backward compatibility
	if test "x$ip6mode" = "x" -a "x$ip6forwarding" != "x"; then
		echo 'WARNING: please migrate to newer rc.conf' \
		    '(use ip6mode, not ip6forwarding)'
		if checkyesno ip6forwarding; then
			ip6mode=router
		else
			if checkyesno rtsol; then
				ip6mode=autohost
			else
				ip6mode=host
			fi
		fi
	fi

	case $ip6mode in
	router)	echo 'IPv6 mode: router'
		sysctl -w net.inet6.ip6.forwarding=1 >/dev/null
		;;
	autohost)
		echo 'IPv6 mode: autoconfigured host'
		sysctl -w net.inet6.ip6.accept_rtadv=1 >/dev/null
		if test "x$ip6defaultif" != "x"; then
			ndp -I $ip6defaultif
		fi
		;;
	host)	echo 'IPv6 mode: host'
		if test "x$ip6defaultif" != "x"; then
			ndp -I $ip6defaultif
		fi
		;;
	*)	echo 'WARNING: invalid value in ip6mode'
		;;
	esac

	if checkyesno rtsol; then
		if test "x$ip6mode" = "xautohost"; then
			echo 'Sending router solicitation...'
			rtsol $rtsol_flags
		else
			echo
			logger -s "WARNING: ip6mode must be set to autohost" \
			    "to use rtsol."
		fi
	fi

	# wait till DAD is completed.
	# always invoke it in case if are configured manually by ifconfig
	dadcount=`sysctl -n net.inet6.ip6.dad_count 2>/dev/null`
	sleep $dadcount
	sleep 1
fi

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