#!/bin/sh
#
#  /etc/rc.net
#
#  Configure all known interfaces according to the rules in /etc/iftab
#
#  Copyright (C) 1992 by NeXT Computer, Inc.  All rights reserved.
#
#  Usage: rc.net [-d] [-h] [interface...]
#

iftab=/etc/iftab

#
#  Let ^C's interrupt the commands run hereunder (eg, ifconfig), not
#  the shell script itself.
#
trap "true" 2

#
#  Handle command options
#
while [ -n "$1" ]; do
    case "$1" in
	-d) DEBUG=-YES-; shift;;
	-h) SETHOSTNAME=-YES-; shift;;
	*) iflist="$*"; break;;
    esac
done

#
#  Debug versions of actual configuration commands
#

docmd() {
    if [ "$DEBUG" = -YES- ]; then
	echo "#" "$@"
    else
	"$@"
    fi
}

#
#  A procedure to use /etc/hostconfig to configure a given interface
#
#  Usage: hostconfig <interface>
#
hostconfig() {
    if [ -n "$INETADDR" -a "$INETADDR" != -NO- ]; then
	cmd="ifconfig $1 inet $INETADDR"
	if [ -n "$IPNETMASK" ]; then
	    cmd="$cmd netmask $IPNETMASK"
	fi
	if [ -n "$IPBROADCAST" -a "$IPBROADCAST" != -AUTOMATIC- ]; then
	    cmd="$cmd broadcast $IPBROADCAST"
	fi
	cmd="$cmd -trailers up"
	docmd $cmd
    fi
}

#
#  Read /etc/hostconfig for backwards compatibility
#
if [ -f /etc/hostconfig ]; then
  . /etc/hostconfig
fi

#
#  Ask ifconfig for all available interface names if none were given
#  on the command line.
#
if [ -z "$iflist" ]; then
    iflist="`ifconfig -a | awk -F: '/^[a-z]/ {print $1}'`"
fi

#
#  Make sure that lo0 is done last, so that it never becomes the
#  primary interface (unless it is the only one we have)
#
iflist=`echo $iflist | awk '{
	for (i = 1; i <= NF; i++)
	    if ($i == "lo0")
		lo0="lo0";
	    else
		print $i;
	 print lo0;}'`
primif=`echo $iflist | awk '{print $1}'`

#
#  Go for it -- configure each interface in our list
#
if [ -s $iftab ]; then
    # Look for matching config information in /etc/iftab
    for if in $iflist; do
	(while read name af args; do
	    # Special hack for primary interface
	    if [ "X$name" = "X-1-" -a $if = $primif ]; then
		name=$if
	    fi
	    # Skip '#' comments while trying to match on each device pattern
	    case $if in
		\#*) ;;
		$name)
		    # Found a matching interface; have we done this address
		    # family before?  (Check by inspecting a shell variable
		    # formed by the device name and the address family, for
		    # example: $en0_inet)
		    eval done=\${$if\_$af}
		    if [ -z "$done" ]; then
			# A "!" escape will allow us to put any configuration
			# command in iftab.  The config command may make use
			# of the shell variables $if and $af to get the name
			# of the current interface and address family.
			case "$args" in
			    -HOSTCONFIG-) hostconfig $if;;
			    !*) eval docmd `echo $args | sed 's/^!//'`;;
			    *)  docmd ifconfig $if $af $args;;
			esac
			eval $if\_$af=DONE
		    fi;;
	    esac
	done) < $iftab
    done
else
    # More backwards compatibility -- if we don't have an /etc/iftab,
    # try using the stuff in /etc/hostconfig instead.
    hostconfig en0
    # Make sure that the loopback interface gets initialized
    docmd ifconfig lo0 inet -AUTOMATIC- netmask -AUTOMATIC-
fi

#
#  Set the hostname if we're asked to do so.
#
if [ "$SETHOSTNAME" = -YES- ]; then
    if [ -z "$HOSTNAME" ]; then
	HOSTNAME=-AUTOMATIC-
    fi
    if [ "$HOSTNAME" != -NO- ]; then
	echo "Setting hostname to $HOSTNAME"
	docmd hostname $HOSTNAME
    fi
fi

#
#  Finally, let nmserver know the fruits of our network configuration endeavor.
#
pid=`ps cax | egrep nmserver | awk '{print $1;}'`
if [ -n "$pid" ]; then
    echo "Reinitializing nmserver's network portion"
    docmd kill -USR2 $pid
fi