More Stupid Script Tricks to DHCP on all interfaces without modifying

standard scripts.  The current FreeBSD 5 image uses this.

tmcd/freebsd5/GNUmakefile.in

@@ -62,6 +62,9 @@ cdboot-install:	destdircheck basefbsdcdboot-install etc-install \
 simple-install:	script-install bin-install # jail-install
 
 dir-install:
+	$(INSTALL) -m 755 -o root -g wheel -d $(SYSETCDIR)
+	$(INSTALL) -m 755 -o root -g wheel -d $(SYSETCDIR)/rc.d
+	$(INSTALL) -m 755 -o root -g wheel -d $(SYSETCDIR)/rc.conf.d
 	$(INSTALL) -m 755 -o root -g wheel -d $(ETCDIR)
 	$(INSTALL) -m 755 -o root -g wheel -d $(BINDIR)
 	$(INSTALL) -m 755 -o root -g wheel -d $(RCDIR)
@@ -94,11 +97,11 @@ etc-install:	dir-install sysetc-install
 	$(INSTALL) -m 600 $(SRCDIR)/master.passwd $(ETCDIR)/master.passwd
 
 sysetc-install:	dir-install
-	$(INSTALL) -m 755 $(SRCDIR)/rc.conf $(SYSETCDIR)/rc.conf
+	$(INSTALL) -m 444 $(SRCDIR)/rc.conf $(SYSETCDIR)/rc.conf
+	$(INSTALL) -m 444 $(SRCDIR)/rc.dhclient $(SYSETCDIR)/rc.conf.d/dhclient
 
 script-install:	dir-install
 #	$(INSTALL) -m 755 $(SRCDIR)/prepare $(BINDIR)/prepare
-	$(INSTALL) -m 755 $(SRCDIR)/dhclient $(BINDIR)/dhclient
 
 jail-install:	dir-install
 	$(INSTALL) -m 755 -o root -g wheel -d $(JAILDIR)

tmcd/freebsd5/dhclient

-#!/bin/sh
-
-. /etc/emulab/paths.sh
-
-trap 'exit 0' 15
-
-echo $* >> /tmp/dh
-
-cnet=`$BINDIR/control_interface`
-if [ -z "$cnet" ]; then
-	echo "WARNING: unknown control net interface, DHCP on all..."
-	/sbin/dhclient
-else
-	/sbin/dhclient $cnet
-fi
-exit 0

tmcd/freebsd5/rc.conf

@@ -15,18 +15,16 @@ ntpd_enable="YES"
 ntpd_program="/usr/local/etc/emulab/ntpstart"
 ntpd_flags="/usr/sbin/ntpd -p /var/run/ntpd.pid"
 
-rc_info="YES"
-
-# Bah! Need to list all possible DHCP'able interfaces to keep
-# new scripts from trying to statically configure them.
-# As with FreeBSD 4.x, there is no way to easily say DHCP on everything.
-ifconfig_em0="DHCP"
-ifconfig_fxp0="DHCP"
-ifconfig_fxp1="DHCP"
-ifconfig_fxp2="DHCP"
-ifconfig_fxp3="DHCP"
-ifconfig_fxp4="DHCP"
-ifconfig_xl0="DHCP"
-
 # no displays
 blanktime="NO"
+
+rc_info="YES"
+
+#
+# FreeBSD has no way to say "DHCP on all available interfaces" without
+# spelling out here what all those interfaces are.  So here we just say
+# to (statically) configure the loopback device.  The real network
+# interfaces are identified in rc.conf.d/dhclient for use by the
+# rc.d/dhclient script.
+#
+network_interfaces="lo0"

tmcd/freebsd5/rc.dhclient

+#
+# In rc.conf, we have told it to just to configure lo0.  Then when the
+# rc.d/dhclient script is executed, it sources this (/etc/rc.conf.d/dhclient)
+# file where we identify all the actual interfaces and mark them as
+# DHCPable.
+#
+# We do this work here rather than directly in rc.conf because rc.conf
+# is sourced by every startup rc file and even some periodic scripts.
+# No point in doing all this work a million times for no reason.
+#
+network_interfaces=`ifconfig -l | sed -e 's/lo0//'`
+for _if in $network_interfaces; do
+	eval ifconfig_${_if}="DHCP"
+done