#!/sbin/sh
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
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#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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# If applicable, add the following below this CDDL HEADER, with the
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#
# Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
# Copyright (c) 2021 H. William Welliver

# This script configures IP routing.

. /lib/svc/share/smf_include.sh

#
# In a shared-IP zone we need this service to be up, but all of the work
# it tries to do is irrelevant (and will actually lead to the service
# failing if we try to do it), so just bail out.
# In the global zone and exclusive-IP zones we proceed.
#
smf_configure_ip || exit $SMF_EXIT_OK

#
# If routing.conf file is in place, and has not already been read in
# by previous invokation of routeadm, legacy configuration is upgraded
# by this call to "routeadm -u".  This call is also needed when
# a /var/svc/profile/upgrade file is found, as it may contain routeadm commands
# which need to be applied.  Finally, routeadm starts in.ndpd by
# enabling the ndp service (in.ndpd), which is required for IPv6 address
# autoconfiguration. It would be nice if we could do this in
# network/loopback, but since the SMF backend is read-only at that
# point in boot, we cannot.
#
/sbin/routeadm -u

#
# Are we routing dynamically? routeadm(1M) reports this in the
# "current" values of ipv4/6-routing - if either are true, we are running
# routing daemons (or at least they are enabled to run).
#
dynamic_routing_test=`/sbin/routeadm -p | \
nawk '/^ipv[46]-routing [.]*/ { print $2 }'  | /usr/bin/grep "current=enabled"`
if [ -n "$dynamic_routing_test" ]; then
	dynamic_routing="true"
fi

#
# Configure default IPv4 routers using the local "/etc/defaultrouter"
# configuration file.  The file can contain the hostnames or IP
# addresses of one or more default routers.  If hostnames are used,
# each hostname must also be listed in the local "/etc/hosts" file
# because NIS is not running at the time that this script is
# run.  Each router name or address is listed on a single line by
# itself in the file.  Anything else on that line after the router's
# name or address is ignored.  Lines that begin with "#" are
# considered comments and ignored.
#
# The default routes listed in the "/etc/defaultrouter" file will
# replace those added by the kernel during diskless booting.  An
# empty "/etc/defaultrouter" file will cause the default route
# added by the kernel to be deleted.
#
# Note that the default router file is ignored if we received routes
# from a DHCP server.  Our policy is to always trust DHCP over local
# administration.
#
smf_netstrategy

#
# See if static routes were created by install. If so, they were created
# under /etc/svc/volatile. Copy them into their proper place.
#
if [ -f /etc/svc/volatile/etc/inet/static_routes ]; then
	echo "Installing persistent routes"
	if [ -f /etc/inet/static_routes ]; then
		cat /etc/svc/volatile/etc/inet/static_routes | grep -v '^#' \
		    >> /etc/inet/static_routes
	else
		cp /etc/svc/volatile/etc/inet/static_routes \
		    /etc/inet/static_routes
	fi
	/usr/bin/rm /etc/svc/volatile/etc/inet/static_routes

fi

#
# Read /etc/inet/static_routes and add each link-local route.
#
if [ -f /etc/inet/static_routes ]; then
	echo "Adding persistent link-local routes:"
	/usr/bin/egrep -v "^(#|$)" /etc/inet/static_routes \
	    | /usr/bin/grep -E -- "-interface |-iface " | while read line; do
		/usr/sbin/route add $line
	done
fi

if [ "$_INIT_NET_STRATEGY" = "dhcp" ] && \
    [ -n "`/sbin/dhcpinfo Router`" ]; then
	defrouters=`/sbin/dhcpinfo Router`
elif [ -f /etc/defaultrouter ]; then
	defrouters=`/usr/bin/grep -v \^\# /etc/defaultrouter | \
	    /usr/bin/awk '{print $1}'`
	if [ -n "$defrouters" ]; then
		#
		# We want the default router(s) listed in
		# /etc/defaultrouter to replace the one added from the
		# BOOTPARAMS WHOAMI response but we must avoid flushing
		# the last route between the running system and its
		# /usr file system.
		#

		# First, remember the original route.
		shift $#
		set -- `/usr/bin/netstat -rn -f inet | \
		    /usr/bin/grep '^default'`
		route_IP="$2"

		#
		# Next, add those from /etc/defaultrouter.  While doing
		# this, if one of the routes we add is for the route
		# previously added as a result of the BOOTPARAMS
		# response, we will see a message of the form:
		#       "add net default: gateway a.b.c.d: entry exists"
		#
		do_delete=yes
		for router in $defrouters; do
			route_added=`/usr/sbin/route -n add default \
			    -gateway $router`
			res=$?
			set -- $route_added
			[ $res -ne 0 -a "$5" = "$route_IP:" ] && do_delete=no
		done

		#
		# Finally, delete the original default route unless it
		# was also listed in the defaultrouter file.
		#
		if [ -n "$route_IP" -a $do_delete = yes ]; then
			/usr/sbin/route -n delete default \
			    -gateway $route_IP >/dev/null
		fi
	else
		/usr/sbin/route -fn > /dev/null
	fi
else
	defrouters=
fi

#
# Use routeadm(1M) to configure forwarding and launch routing daemons
# for IPv4 and IPv6 based on preset values.  These settings only apply
# to the global zone.  For IPv4 dynamic routing, the system will default
# to disabled if a default route was previously added via BOOTP, DHCP,
# or the /etc/defaultrouter file.  routeadm also starts in.ndpd.
#
if [ "$dynamic_routing" != "true"  ] && [ -z "$defrouters" ]; then
	#
	# No default routes were setup by "route" command above.
	# Check the kernel routing table for any other default
	# routes.
	#
	/usr/bin/netstat -rn -f inet | \
	    /usr/bin/grep default >/dev/null 2>&1 && defrouters=yes
fi

#
# The routeadm/ipv4-routing-set property is true if the administrator
# has run "routeadm -e/-d ipv4-routing".  If not, we revert to the
# appropriate defaults.  We no longer run "routeadm -u" on every boot
# however, as persistent daemon state is now controlled by SMF.
#
ipv4_routing_set=`/usr/bin/svcprop -p routeadm/ipv4-routing-set $SMF_FMRI`
if [ -z "$defrouters" ]; then
	#
	# Set default value for ipv4-routing to enabled.  If routeadm -e/-d
	# has not yet been run by the administrator, we apply this default.
	# The -b option is project-private and informs routeadm not
	# to treat the enable as administrator-driven.
	#
	/usr/sbin/svccfg -s $SMF_FMRI \
	    setprop routeadm/default-ipv4-routing = true
	if [ "$ipv4_routing_set" = "false" ]; then
		/sbin/routeadm -b -e ipv4-routing -u
	fi
else
	#
	# Default router(s) have been found,  so ipv4-routing default value
	# should be disabled.  If routaedm -e/d has not yet been run by
	# the administrator, we apply this default.  The -b option is
	# project-private and informs routeadm not to treat the disable as
	# administrator-driven.
	#
	/usr/sbin/svccfg -s $SMF_FMRI \
	    setprop routeadm/default-ipv4-routing = false
	if [ "$ipv4_routing_set" = "false" ]; then
		/sbin/routeadm -b -d ipv4-routing -u
	fi
fi

#
# Read /etc/inet/static_routes and add each non-link-local route.
#
if [ -f /etc/inet/static_routes ]; then
	echo "Adding persistent routes:"
	/usr/bin/egrep -v "^(#|$)" /etc/inet/static_routes \
	    | /usr/bin/grep -v -E -- "-interface |-iface " | while read line; do
		/usr/sbin/route add $line
	done
fi

# Clear exit status.
exit $SMF_EXIT_OK