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backout rev. 1.59. Will be re-done differently.

#!/bin/sh
#
# $NetBSD: network,v 1.60 2009/09/11 21:25:07 cegger Exp $
#

# PROVIDE: network
# REQUIRE: ipfilter ipsec mountcritlocal root tty sysctl
# BEFORE:  NETWORKING

$_rc_subr_loaded . /etc/rc.subr

name="network"
start_cmd="network_start"
stop_cmd="network_stop"

nl='
' # a newline

network_start()
{
	# set hostname, turn on network
	#
	echo "Starting network."

	# If $hostname is set, use it for my Internet name,
	# otherwise use /etc/myname
	#
	if [ -z "$hostname" ] && [ -f /etc/myname ]; then
		hostname=$(cat /etc/myname)
	fi
	if [ -n "$hostname" ]; then
		echo "Hostname: $hostname"
		hostname $hostname
	else
		# Don't warn about it if we're going to run
		# DHCP later, as we will probably get the
		# hostname at that time.
		#
		if ! checkyesno dhclient && ! checkyesno dhcpcd && \
			[ -z "$(hostname)" ]
		then
			warn "\$hostname not set."
		fi
	fi

	# Check $domainname first, then /etc/defaultdomain,
	# for NIS/YP domain name
	#
	if [ -z "$domainname" ] && [ -f /etc/defaultdomain ]; then
		domainname=$(cat /etc/defaultdomain)
	fi
	if [ -n "$domainname" ]; then
		echo "NIS domainname: $domainname"
		domainname $domainname
	fi

	# Flush all routes just to make sure it is clean
	if checkyesno flushroutes; then
		/sbin/route -qn flush
	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 will occur if lo0 isn't configured.
	#
	/sbin/ifconfig lo0 inet 127.0.0.1

	# According to RFC1122, 127.0.0.0/8 must not leave the node.
	#
	/sbin/route -q add -inet 127.0.0.0 -netmask 0xff000000 127.0.0.1 -reject

	# IPv6 routing setups, and host/router mode selection.
	#
	if /sbin/ifconfig lo0 inet6 >/dev/null 2>&1; then
		# We have IPv6 support in kernel.

		# disallow link-local unicast dest without outgoing scope
		# identifiers.
		#
		/sbin/route -q add -inet6 fe80:: -prefixlen 10 ::1 -reject

		# disallow the use of the RFC3849 documentation address
		#
		/sbin/route -q add -inet6 2001:db8:: -prefixlen 32 ::1 -reject

		# IPv6 site-local scoped address prefix (fec0::/10)
		# has been deprecated by RFC3879.
		#
		if [ -n "$ip6sitelocal" ]; then
			warn "\$ip6sitelocal is no longer valid"
		fi

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

		# disallow packets to malicious IPv4 compatible prefix
		#
		/sbin/route -q add -inet6 ::224.0.0.0 -prefixlen 100 ::1 -reject
		/sbin/route -q add -inet6 ::127.0.0.0 -prefixlen 104 ::1 -reject
		/sbin/route -q add -inet6 ::0.0.0.0 -prefixlen 104 ::1 -reject
		/sbin/route -q add -inet6 ::255.0.0.0 -prefixlen 104 ::1 -reject

		# disallow packets to malicious 6to4 prefix
		#
		/sbin/route -q add -inet6 2002:e000:: -prefixlen 20 ::1 -reject
		/sbin/route -q add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject
		/sbin/route -q add -inet6 2002:0000:: -prefixlen 24 ::1 -reject
		/sbin/route -q add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject

		# Completely disallow packets to IPv4 compatible prefix.
		# This may conflict with RFC1933 under following circumstances:
		# (1) An IPv6-only KAME node tries to originate packets to IPv4
		#     compatible destination.  The KAME node has no IPv4
		#     compatible support.  Under RFC1933, it should transmit
		#     native IPv6 packets toward IPv4 compatible destination,
		#     hoping it would reach a router that forwards the packet
		#     toward auto-tunnel interface.
		# (2) An IPv6-only node originates a packet to IPv4 compatible
		#     destination.  A KAME node is acting as an IPv6 router, and
		#     asked to forward it.
		# Due to rare use of IPv4 compatible address, and security
		# issues with it, we disable it by default.
		#
		/sbin/route -q add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject

		/sbin/sysctl -qw net.inet6.ip6.forwarding=0
		/sbin/sysctl -qw net.inet6.ip6.accept_rtadv=0

		case $ip6mode in
		router)
			echo 'IPv6 mode: router'
			/sbin/sysctl -qw net.inet6.ip6.forwarding=1

			# disallow unique-local unicast forwarding without
			# explicit configuration.
			if ! checkyesno ip6uniquelocal; then
				/sbin/route -q add -inet6 fc00:: -prefixlen 7 \
				    ::1 -reject
			fi
			;;

		autohost)
			echo 'IPv6 mode: autoconfigured host'
			/sbin/sysctl -qw net.inet6.ip6.accept_rtadv=1
			;;

		host)	
			echo 'IPv6 mode: host'
			;;

		*)	warn "invalid \$ip6mode value "\"$ip6mode\"
			;;

		esac
	fi

	# 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 break it into lines using ';' as a separator,
	# then process it just like the contents of an /etc/ifconfig.xxN
	# file.
	#
	# For each line from the $ifconfig_xxN variable or the
	# /etc/ifconfig.xxN file, we ignore comments and blank lines,
	# treat lines beginning with "!" as commands to execute, treat
	# "dhcp" as a special case to invoke dhcpcd, and for any other
	# line we run "ifconfig xxN", using each line of the file as the
	# arguments for a separate "ifconfig" invocation.
	#
	# In order to configure an interface reasonably, you at the very least
	# need to specify "[addr_family] [hostname]" (e.g "inet my.domain.org"),
	# and probably a netmask (as in "netmask 0xffffffe0"). You will
	# frequently need to specify a media type, as in "media UTP", for
	# interface cards with multiple media connections that do not
	# autoconfigure. See the ifconfig manual page for details.
	#
	# Note that /etc/ifconfig.xxN takes multiple lines.  The following
	# configuration is possible:
	#	inet 10.1.1.1 netmask 0xffffff00
	#	inet 10.1.1.2 netmask 0xffffff00 alias
	#	inet6 2001:db8::1 prefixlen 64 alias
	#
	# You can put shell script fragment into /etc/ifconfig.xxN by
	# starting a line with "!".  Refer to ifconfig.if(5) for details.
	#
	if [ "$net_interfaces" != NO ]; then
		if checkyesno auto_ifconfig; then
			tmp=$(/sbin/ifconfig -l)
			for cloner in $(/sbin/ifconfig -C 2>/dev/null); do
				for int in /etc/ifconfig.${cloner}[0-9]*; do
					[ ! -f $int ] && break
					tmp="$tmp ${int##*.}"
				done
			done
		else
			tmp="$net_interfaces"
		fi
		echo -n 'Configuring network interfaces:'
		for int in $tmp; do
			eval argslist=\$ifconfig_$int

			# Skip interfaces that do not have explicit
			# configuration information.  If auto_ifconfig is
			# false then also warn about such interfaces.
			#
			if [ -z "$argslist" ] && ! [ -f /etc/ifconfig.$int ]
			then
				if ! checkyesno auto_ifconfig; then
					echo
					warn \
			"/etc/ifconfig.$int missing and ifconfig_$int not set;"
					warn "interface $int not configured."
				fi
				continue
			fi

			echo -n " $int"

			# Create the interface if necessary.
			# If the interface did not exist before,
			# then also resync ipf(4).
			#
			if /sbin/ifconfig $int create 2>/dev/null && \
			   checkyesno ipfilter; then
				/sbin/ipf -y >/dev/null
			fi

			# If $ifconfig_xxN is empty, then use
			# /etc/ifconfig.xxN, which we know exists due to
			# an earlier test.
			#
			# If $ifconfig_xxN is non-empty and contains a
			# newline, then just use it as is.  (This allows
			# semicolons through unmolested.)
			#
			# If $ifconfig_xxN is non-empty and does not
			# contain a newline, then convert all semicolons
			# to newlines.
			#
			case "$argslist" in
			'')
				cat /etc/ifconfig.$int
				;;
			*"${nl}"*)
				echo "$argslist"
				;;
			*)
				(
					set -o noglob
					IFS=';'; set -- $argslist
					#echo >&2 "[$#] [$1] [$2] [$3] [$4]"
					IFS="$nl"; echo "$*"
				)
				;;
			esac |
			while read -r args; do
				case "$args" in
				''|"#"*|create)
					;;
				"!"*)
					# Run arbitrary command in a subshell.
					( eval "${args#*!}" )
					;;
				dhcp)
					if ! checkyesno dhcpcd; then
						/sbin/dhcpcd -n \
							${dhcpcd_flags} $int
					fi
					;;
				*)
					# Pass args to ifconfig.  Note
					# that args may contain embedded
					# shell metacharacters, such as
					# "ssid 'foo;*>bar'". We eval
					# one more time so that things
					# like ssid "Columbia University" work.
					(
						set -o noglob
						eval set -- $args
						#echo >&2 "[$#] [$1] [$2] [$3]"
						/sbin/ifconfig $int "$@"
					)
					;;
				esac
			done
			configured_interfaces="$configured_interfaces $int"
		done
		echo "."
	fi

	echo -n "Adding interface aliases:"

	# 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 in certain cases and its
	# use is not recommended.  Use /etc/ifconfig.xxN or multiple
	# commands in $ifconfig_xxN instead.
	#
	for int in lo0 $configured_interfaces; do
		eval args=\$ifaliases_$int
		if [ -n "$args" ]; then
			set -- $args
			while [ $# -ge 2 ]; do
				addr=$1 ; net=$2 ; shift 2
				if [ "$net" = "-" ]; then
					# for compatibility only, obsolete
					/sbin/ifconfig $int inet alias $addr
				else
					/sbin/ifconfig $int inet alias $addr \
					    netmask $net
				fi
				echo -n " $int:$addr"
			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 in certain cases and its
	# use is not recommended.  Use /etc/ifconfig.xxN or multiple
	# commands in $ifconfig_xxN instead.
	#
	if [ -f /etc/ifaliases ]; then
		while read addr int net; do
			if [ -z "$net" ]; then
				# for compatibility only, obsolete
				/sbin/ifconfig $int inet alias $addr
			else
				/sbin/ifconfig $int inet alias $addr netmask $net
			fi
		done < /etc/ifaliases
	fi

	echo "." # for "Adding interface aliases:"

	# Check $defaultroute, then /etc/mygate, for the name or address
	# of my IPv4 gateway host. If using a name, that name must be in
	# /etc/hosts.
	#
	if [ -z "$defaultroute" ] && [ -f /etc/mygate ]; then
		defaultroute=$(cat /etc/mygate)
	fi
	if [ -n "$defaultroute" ]; then
		/sbin/route add default $defaultroute
	fi

	# Check $defaultroute6, then /etc/mygate6, for the name or address
	# of my IPv6 gateway host. If using a name, that name must be in
	# /etc/hosts.  Note that the gateway host address must be a link-local
	# address if it is not using an stf* interface.
	#
	if [ -z "$defaultroute6" ] && [ -f /etc/mygate6 ]; then
		defaultroute6=$(cat /etc/mygate6)
	fi
	if [ -n "$defaultroute6" ]; then
		if [ "$ip6mode" = "autohost" ]; then
			echo
			warn \
	    "ip6mode is set to 'autohost' and a v6 default route is also set."
		fi
		/sbin/route add -inet6 default $defaultroute6
	fi

	# IPv6 interface autoconfiguration.
	#
	if /sbin/ifconfig lo0 inet6 >/dev/null 2>&1; then
		# wait till DAD is completed. always invoke it in case
		# if are configured manually by ifconfig
		#
		dadcount=$(/sbin/sysctl -n net.inet6.ip6.dad_count 2>/dev/null)
		sleep $dadcount
		sleep 1

		if checkyesno rtsol; then
			if [ "$ip6mode" = "autohost" ]; then
				echo 'Sending router solicitation...'
				/sbin/rtsol $rtsol_flags
			else
				echo
				warn \
			    "ip6mode must be set to 'autohost' to use rtsol."
			fi

			# wait till DAD is completed, for global addresses
			# configured by router advert message.
			#
			sleep $dadcount
			sleep 1
		fi
	fi

	# XXX this must die
	if [ -s /etc/netstart.local ]; then
		sh /etc/netstart.local start
	fi
}

network_stop()
{
	echo "Stopping network."

	# XXX this must die
	if [ -s /etc/netstart.local ]; then
		sh /etc/netstart.local stop
	fi

	echo "Deleting aliases."
	if [ -f /etc/ifaliases ]; then
		while read addr int net; do
			/sbin/ifconfig $int inet delete $addr
		done < /etc/ifaliases
	fi

	for int in $(/sbin/ifconfig -lu); do
		eval args=\$ifaliases_$int
		if [ -n "$args" ]; then
			set -- $args
			while [ $# -ge 2 ]; do
				addr=$1 ; net=$2 ; shift 2
				/sbin/ifconfig $int inet delete $addr
			done
		fi
	done

	# down interfaces
	#
	echo -n 'Downing network interfaces:'
	if [ "$net_interfaces" != NO ]; then
		if checkyesno auto_ifconfig; then
			tmp=$(/sbin/ifconfig -l)
		else
			tmp="$net_interfaces"
		fi
		for int in $tmp; do
			eval args=\$ifconfig_$int
			if [ -n "$args" ] || [ -f /etc/ifconfig.$int ]; then
				echo -n " $int"
				if [ -f /var/run/dhcpcd-$int.pid ]; then
					/sbin/dhcpcd -k $int 2> /dev/null
				fi
				/sbin/ifconfig $int down
				if /sbin/ifconfig $int destroy 2>/dev/null && \
				   checkyesno ipfilter; then
					# resync ipf(4)
					/sbin/ipf -y >/dev/null
				fi
			fi
		done
		echo "."
	fi

	# flush routes
	#
	/sbin/route -qn flush

}

load_rc_config $name
load_rc_config_var dhclient dhclient
load_rc_config_var dhcpcd dhcpcd
load_rc_config_var ipfilter ipfilter
run_rc_command "$1"