udp-broadcast-relay-redux: Add package

This commit is largely based on the work from Daniel Dickinson in
PR #2096 which was never merged. I tweaked it in a number of ways.
All bugs with this package are mine, not his.

Signed-off-by: Aaron Curley <accwebs@gmail.com>

net/udp-broadcast-relay-redux-openwrt/files/udp-broadcast-relay-redux.init

@@ -0,0 +1,76 @@
+#!/bin/sh /etc/rc.common
+
+START=90
+STOP=10
+
+USE_PROCD=1
+PROG=/usr/sbin/udp-broadcast-relay-redux
+NAME=udp-broadcast-relay-redux
+PIDCOUNT=0
+
+validate_section_udp_broadcast_relay_redux()
+{
+    uci_validate_section udp_broadcast_relay_redux udp_broadcast_relay_redux "${1}" \
+	'id:uinteger' \
+	'port:port' \
+	'network:list(string)' \
+	'src_override:ip4addr' \
+	'dest_override:ip4addr'
+
+    [ -z "$id" ] && return 1
+
+    [ -z "$network" ] && return 1
+
+    [ -z "$port" ] && return 1
+
+    return 0
+}
+
+udp_broadcast_relay_redux_instance() {
+    local net network ifname id port src_override dest_override
+
+    validate_section_udp_broadcast_relay_redux "${1}" || {
+	echo "Validation failed"
+	return 1
+    }
+
+    PIDCOUNT="$((PIDCOUNT + 1))"
+
+    procd_open_instance
+    procd_set_param command "$PROG" "--id" "${id}" "--port" "${port}"
+
+    for net in $network; do
+	network_get_device ifname "$net"
+	if [ -z "$ifname" ]; then
+	    network_get_physdev ifname "$net"
+	fi
+	if [ -n "$ifname" ]; then
+	    procd_append_param command "--dev" "$ifname"
+	    procd_append_param netdev "$ifname"
+	fi
+    done
+
+    if [ -n "$src_override" ] ; then
+        procd_append_param command "-s" "$src_override"
+    fi
+
+    if [ -n "$dest_override" ] ; then
+        procd_append_param command "-t" "$dest_override"
+    fi
+
+    procd_add_jail ubr-${PIDCOUNT}
+    procd_close_instance
+}
+
+start_service() {
+    . /lib/functions.sh
+    . /lib/functions/network.sh
+
+    config_load udp_broadcast_relay_redux
+    config_foreach udp_broadcast_relay_redux_instance udp_broadcast_relay_redux
+}
+
+service_triggers() {
+    procd_add_reload_trigger "udp_broadcast_relay_redux"
+    procd_add_validation validate_section_udp_broadcast_relay_redux
+}