Make psd and dhcpcd configureable

etc/default/dhcpcd

@@ -0,0 +1,2 @@
+# Specify for which interfaces you want dhcpcd to run
+#IFACES=""

etc/default/psd

@@ -0,0 +1,5 @@
+# Users for which psd should be enabled
+#USERS=""
+
+# If $USERS is empty, scan for users that run psd and store them in this file.
+#USERS_CACHE="/run/psd-users.cache"

etc/rc.d/rc.dhcpcd

@@ -4,15 +4,22 @@
 #
 # Start/stop the DHCP daemon.
 #
-# This script doesn't do anything other than starting dhcpcp for all interfaces. For more functionality see rc.inet1.
+# This script doesn't do anything other than starting dhcpcp for the specified interfaces (or all of them). For more functionality see rc.inet1.
+
+IFACES=""
+if [ -f /etc/default/dhcpcd ]; then
+    . /etc/default/dhcpcd
+fi
 
 case "$1" in
 'start')
-  dhcpcd -b
+  shift
+  dhcpcd -b ${@:-$IFACES}
   ;;
 'stop')
-  dhcpcd -k
+  shift
+  dhcpcd -k ${@:-$IFACES}
   ;;
 *)
-  echo "Usage: $0 start|stop"
+  echo "Usage: $0 start|stop [interfaces]"
 esac

etc/rc.d/rc.psd

@@ -10,6 +10,9 @@
 
 USERS=""
 USERS_CACHE="/run/psd-users.cache"
+if [ -f /etc/default/psd ]; then
+    . /etc/default/psd
+fi
 
 scan_users() {
   rm -f "$USERS_CACHE"