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Prevent warning about insecure hostnames where no /etc/hostname.*
exists. From wcmaier@.

Check target of symbolic links to avoid noise at boot and in
seucrity output where you have several interfaces symlinked to one
config file.

"If you think this is the right thing to do" deraadt@

#!/bin/sh -
#
#	$OpenBSD: netstart,v 1.122 2008/07/23 16:05:47 sthen Exp $

# Strip comments (and leading/trailing whitespace if IFS is set)
# from a file and spew to stdout
stripcom() {
	local _l
	[[ -f $1 ]] || return
	while read _l; do
		[[ -n ${_l%%#*} ]] && echo $_l
	done<$1
}

# Returns true if $1 contains only alphanumerics
isalphanumeric() {
	local _n
	_n=$1
	while [ ${#_n} != 0 ]; do
		case $_n in
			[A-Za-z0-9]*)	;;
			*)		return 1;;
		esac
		_n=${_n#?}
	done
	return 0
}

# Start the $1 interface
ifstart() {
	if=$1
	# Interface names must be alphanumeric only.  We check to avoid
	# configuring backup or temp files, and to catch the "*" case.
	if ! isalphanumeric "$if"; then
		return
	fi

	file=/etc/hostname.$if
	if ! [ -f $file ]; then
		echo "netstart: $file: No such file or directory"
		return
	fi
	if [ "$(stat -Lf "%SLp %u %g" $file)" != "--- 0 0" ]; then
		echo "WARNING: $file is insecure, fixing permissions"
		chmod -LR o-rwx $file
		chown -LR root.wheel $file
	fi
	ifconfig $if > /dev/null 2>&1
	if [ "$?" != "0" ]; then
		# Try to create interface if it does not exist
		ifconfig $if create > /dev/null 2>&1
		if [ "$?" != "0" ]; then
			return
		fi
	fi

	# Now parse the hostname.* file
	while :; do
		if [ "$cmd2" ]; then
			# We are carrying over from the 'read dt dtaddr'
			# last time.
			set -- $cmd2
			af="$1" name="$2" mask="$3" bcaddr="$4" ext1="$5" cmd2=
			# Make sure and get any remaining args in ext2,
			# like the read below
			i=1
			while [ i -lt 6 -a -n "$1" ]; do shift; let i=i+1; done
			ext2="$@"
		else
			# Read the next line or exit the while loop.
			read af name mask bcaddr ext1 ext2 || break
		fi
		# $af can be "dhcp", "up", "rtsol", an address family,
		# commands, or a comment.
		case "$af" in
		"#"*|"") # skip comments and empty lines
			continue
			;;
		"!"*) # parse commands
			cmd="${af#*!} ${name} ${mask} ${bcaddr} ${ext1} ${ext2}"
			;;
		"bridge")
			cmd="echo /etc/hostname.$if: bridges now supported via bridgename.* files"
			;;
		"dhcp")
			[ "$name" = "NONE" ] && name=
			[ "$mask" = "NONE" ] && mask=
			[ "$bcaddr" = "NONE" ] && bcaddr=
			cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 down"
			cmd="$cmd;dhclient $if"
			dhcpif="$dhcpif $if"
			;;
		"rtsol")
			rtsolif="$rtsolif $if"
			cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 up"
			;;
		"up")
			# The only one of these guaranteed to be set is $if.
			# The remaining ones exist so that media controls work.
			cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 up"
			;;
		*)
			read dt dtaddr
			if [ "$name"  = "alias" ]; then
				# perform a 'shift' of sorts
				alias=$name
				name=$mask
				mask=$bcaddr
				bcaddr=$ext1
				ext1=$ext2
				ext2=
			else
				alias=
			fi
			cmd="ifconfig $if $af $alias $name"
			case "$dt" in
			dest)
				cmd="$cmd $dtaddr"
				;;
			[a-z!]*)
				cmd2="$dt $dtaddr"
				;;
			esac
			if [ ! -n "$name" ]; then
				echo "/etc/hostname.$if: invalid network configuration file"
				return
			fi
			case $af in
			inet)
				[ "$mask" ] && cmd="$cmd netmask $mask"
				if [ "$bcaddr" -a "X$bcaddr" != "XNONE" ]; then
					cmd="$cmd broadcast $bcaddr"
				fi
				[ "$alias" ] && rtcmd=";route -qn add -host $name 127.0.0.1"
				;;
			inet6) [ "$mask" ] && cmd="$cmd prefixlen $mask"
				cmd="$cmd $bcaddr"
				;;
			*)
				cmd="$cmd $mask $bcaddr"
				;;
			esac
			cmd="$cmd $ext1 $ext2$rtcmd" rtcmd=
			;;
		esac
		eval "$cmd"
	done < /etc/hostname.$if
}

# Start multiple:
#   start "$1" interfaces in order or all interfaces if empty
#   don't start "$2" interfaces
ifmstart() {
	for sif in ${1:-ALL}; do
		for hn in /etc/hostname.*; do
			# Strip off /etc/hostname. prefix
			if=${hn#/etc/hostname.}
			test "$if" = "*" && continue

			# Skip unwanted ifs
			s=""
			for xf in $2; do
				test "$xf" = "${if%%[0-9]*}" && s="1" && break
			done
			test "$s" = "1" && continue

			# Start wanted ifs
			test "$sif" = "ALL" -o \
			     "$sif" = "${if%%[0-9]*}" \
				&& ifstart $if
		done
	done
}

# Start the $1 bridge
bridgestart() {
	# Interface names must be alphanumeric only.  We check to avoid
	# configuring backup or temp files, and to catch the "*" case.
	if ! isalphanumeric "$1"; then
		return
	fi
	brconfig $1 > /dev/null 2>&1
	if [ "$?" != "0" ]; then
		# Try to create interface if it does not exist
		ifconfig $1 create > /dev/null 2>&1
		if [ "$?" != "0" ]; then
			return
		fi
	fi

	# Now parse the bridgename.* file
	# All lines are run as brconfig(8) commands.
	while read line ; do
		line=${line%%#*}		# strip comments
		test -z "$line" && continue
		case "$line" in
		"!"*)
			cmd="${line#*!}"
			;;
		*)
			cmd="brconfig $1 $line"
			;;
		esac
		eval "$cmd"
	done < /etc/bridgename.$1
}

# Re-read /etc/rc.conf
. /etc/rc.conf

# If we were invoked with a list of interface names, just reconfigure these
# interfaces (or bridges) and return.
if [ $1x = autobootx ]; then
	shift
fi
if [ $# -gt 0 ]; then
	while [ $# -gt 0 ]; do
		if [ -f /etc/bridgename.$1 ]; then
			bridgestart $1
		else
			ifstart $1
		fi
		shift
	done
	return
fi

# Otherwise, process with the complete network initialization.

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

if [ -f /etc/defaultdomain ]; then
	domainname `stripcom /etc/defaultdomain`
fi

# Set the address for the loopback interface.  Bringing the
# interface up, automatically invokes the IPv6 address ::1)
ifconfig lo0 inet 127.0.0.1

if ifconfig lo0 inet6 >/dev/null 2>&1; then
	# IPv6 configurations.
	ip6kernel=YES

	# Disallow link-local unicast dest without outgoing scope identifiers.
	route -qn add -inet6 fe80:: -prefixlen 10 ::1 -reject > /dev/null

	# Disallow site-local unicast dest without outgoing scope identifiers.
	# If you configure site-locals without scope id (it is permissible
	# config for routers that are not on scope boundary), you may want
	# to comment the line out.
	route -qn add -inet6 fec0:: -prefixlen 10 ::1 -reject > /dev/null

	# Disallow "internal" addresses to appear on the wire.
	route -qn add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject > /dev/null

	# Disallow packets to malicious IPv4 compatible prefix.
	route -qn add -inet6 ::224.0.0.0 -prefixlen 100 ::1 -reject > /dev/null
	route -qn add -inet6 ::127.0.0.0 -prefixlen 104 ::1 -reject > /dev/null
	route -qn add -inet6 ::0.0.0.0 -prefixlen 104 ::1 -reject > /dev/null
	route -qn add -inet6 ::255.0.0.0 -prefixlen 104 ::1 -reject > /dev/null

	# Disallow packets to malicious 6to4 prefix.
	route -qn add -inet6 2002:e000:: -prefixlen 20 ::1 -reject > /dev/null
	route -qn add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject > /dev/null
	route -qn add -inet6 2002:0000:: -prefixlen 24 ::1 -reject > /dev/null
	route -qn add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject > /dev/null

	# Disallow packets without scope identifier.
	route -qn add -inet6 ff01:: -prefixlen 16 ::1 -reject > /dev/null
	route -qn add -inet6 ff02:: -prefixlen 16 ::1 -reject > /dev/null

	# 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 an IPv4 compatible
	#     destination.  A KAME node is acting as an IPv6 router, and
	#     asked to forward it.
	# Due to rare use of IPv4 compatible addresses, and security issues
	# with it, we disable it by default.
	route -qn add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject > /dev/null

	rtsolif=""
else
	ip6kernel=NO
fi


# Configure all the non-loopback interfaces which we know about, but
# do not start interfaces which must be delayed.
# Refer to hostname.if(5) and bridgename.if(5)
ifmstart "" "trunk vlan carp gif gre pfsync pppoe"

# The trunk interfaces need to come up first in this list.
# The vlan interfaces need to come up after trunk.
# Configure all the carp interfaces which we know about before default route.
ifmstart "trunk vlan carp"

if [ "$ip6kernel" = "YES" -a "x$rtsolif" != "x" ]; then
	fw=`sysctl -n net.inet6.ip6.forwarding`
	ra=`sysctl -n net.inet6.ip6.accept_rtadv`
	if [ "x$fw" = "x0" -a "x$ra" = "x1" ]; then
		echo "IPv6 autoconf:$rtsolif"
		rtsol $rtsolif
	else
		echo "WARNING: inconsistent config - check /etc/sysctl.conf for IPv6 autoconf"
	fi
fi

# /etc/mygate, if it exists, contains the name of my gateway host
# that name must be in /etc/hosts.
[[ -z $dhcpif ]] && stripcom /etc/mygate | while read gw; do
		[[ $gw == @(*:*) ]] && continue
		route -qn delete default > /dev/null 2>&1
		route -qn add -host default $gw && break
done
[[ -z $rtsolif ]] && stripcom /etc/mygate | while read gw; do
		[[ $gw == !(*:*) ]] && continue
		route -qn delete -inet6 default > /dev/null 2>&1
		route -qn add -host -inet6 default $gw && break
done

# Multicast routing.
#
# The routing to the 224.0.0.0/4 net is setup according to these rules:
# multicast_host	multicast_router	route		comment
# NO			NO			-reject		no multicast
# NO			YES			none installed	daemon will run
# YES/interface		NO			-interface	YES=def. iface
#	   Any other combination		-reject		config error
route -qn delete 224.0.0.0/4 > /dev/null 2>&1
case "$multicast_host:$multicast_router" in
NO:NO)
	route -qn add -net 224.0.0.0/4 -interface 127.0.0.1 -reject > /dev/null
	;;
NO:YES)
	;;
*:NO)
	maddr=`if [ "$multicast_host" = "YES" ]; then
		ed -s '!route -qn show -inet' <<EOF
/^default/p
EOF
	else
		ed -s "!ifconfig $multicast_host" <<EOF
/^	inet /p
EOF
	fi 2> /dev/null`
	if [ "X${maddr}" != "X" ]; then
		set $maddr
		route -qn add -net 224.0.0.0/4 -interface $2 > /dev/null
	else
		route -qn add -net 224.0.0.0/4 -interface \
			127.0.0.1 -reject > /dev/null
	fi
	;;
*:*)
	echo 'config error, multicasting disabled until rc.conf is fixed'
	route -qn add -net 224.0.0.0/4 -interface 127.0.0.1 -reject > /dev/null
	;;
esac


# Configure PPPoE, GIF, GRE interfaces, delayed because they require routes
# to be set.  PPPoE must be first, as GIF and GRE may depend on it.
ifmstart "pppoe gif gre"

# reject 127/8 other than 127.0.0.1
route -qn add -net 127 127.0.0.1 -reject > /dev/null

# Configure all the bridges.
for bn in /etc/bridgename.*; do
	# Strip off /etc/bridgename. prefix
	if=${bn#/etc/bridgename.}
	test "$if" = "*" && continue

	bridgestart $if
done

if [ "$ip6kernel" = "YES" ]; then
	# this is to make sure DAD is completed before going further.
	sleep `sysctl -n net.inet6.ip6.dad_count`
fi