mdns: add the new openwrt mdns daemon

this is still wip, you can use the following ubus calls.

ubus call mdns scan	# triggers a scan
ubus call mdns browse	# look at the currenlty cached records
ubus call mdns hosts	# look at the currenlty cached hosts

TODO
- ipv6, currenlty AAAA records are handled but only on v4 sockets
- finish the service announce code

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 41345

2 files changed, 53 insertions, 0 deletions

diff --git a/package/network/services/mdns/files/mdns.config b/package/network/services/mdns/files/mdns.config
new file mode 100644
index 0000000000..d64ba6768c
--- /dev/null
+++ b/package/network/services/mdns/files/mdns.config
@@ -0,0 +1,2 @@
+config mdns
+	list network lan
diff --git a/package/network/services/mdns/files/mdns.init b/package/network/services/mdns/files/mdns.init
new file mode 100644
index 0000000000..f66de11d3f
--- /dev/null
+++ b/package/network/services/mdns/files/mdns.init
@@ -0,0 +1,51 @@
+#!/bin/sh /etc/rc.common
+# Copyright (c) 2014 OpenWrt.org
+
+. /lib/functions/network.sh
+
+START=80
+
+USE_PROCD=1
+PROG=/usr/sbin/mdns
+IFACES=""
+
+load_ifaces() {
+	local network="$(uci get mdns.@mdns[-1].network)"
+	for n in $network; do
+		local device
+		json_load "$(ifstatus $network)"
+		json_get_var device l3_device
+		echo -n "$device "
+	done
+}
+
+reload_service() {
+	json_init
+	json_add_array interfaces
+	for i in $(load_ifaces); do
+		json_add_string "" "$i"
+	done
+	json_close_array
+
+	ubus call mdns set_config "$(json_dump)"
+}
+
+start_service() {
+	local network="$(uci get mdns.@mdns[-1].network)"
+
+	procd_open_instance
+	procd_set_param command "$PROG"
+	procd_set_param respawn
+	procd_open_trigger
+	procd_add_config_trigger "config.change" "mdns" /etc/init.d/mdns reload
+	for n in $network; do
+		procd_add_interface_trigger "interface.*" $n /etc/init.d/mdns reload	
+	done
+	procd_close_trigger
+	procd_close_instance
+}
+
+service_started() {
+	ubus wait_for -t 5 mdns
+	[ $? = 0 ] && reload_service
+}