procd: make mDNS TXT record parsing more solid

mDNS broadcast can't accept empty TXT record and would fail
registration.

Current procd_add_mdns_service checks only if the first passed arg is
empty but don't make any verification on the other args permittins
insertion of empty values in TXT record.

Example:

	procd_add_mdns "blah" \
				"tcp" "50" \
				"1" \
				"" \
				"3"

Produce:

{ "blah_50": { "service": "_blah._tcp.local", "port": 50, "txt": [ "1", "", "3" ] } }

The middle empty TXT record should never be included as it's empty.

This can happen with scripts that make fragile parsing and include
variables even if they are empty.

Prevent this and make the TXT record more solid by checking every
provided TXT record and include only the non-empty ones.

The fixed JSON is the following:

{ "blah_50": { "service": "_blah._tcp.local", "port": 50, "txt": [ "1", "3" ] } }

Fixes: b0d9dcf ("procd: update to latest git HEAD")
Reported-by: Paul Donald <[email protected]>
Link: openwrt/openwrt#15331
Signed-off-by: Christian Marangi <[email protected]>
(cherry picked from commit 4b04304)

package/system/procd/files/procd.sh

@@ -570,18 +570,21 @@ _procd_set_config_changed() {
 }
 
 procd_add_mdns_service() {
-	local service proto port
+	local service proto port txt_count=0
 	service=$1; shift
 	proto=$1; shift
 	port=$1; shift
 	json_add_object "${service}_$port"
 	json_add_string "service" "_$service._$proto.local"
 	json_add_int port "$port"
-	[ -n "$1" ] && {
-		json_add_array txt
-		for txt in "$@"; do json_add_string "" "$txt"; done
-		json_select ..
-	}
+	for txt in "$@"; do
+		[ -z "$txt" ] && continue
+		txt_count=$((txt_count+1))
+		[ $txt_count -eq 1 ] && json_add_array txt
+		json_add_string "" "$txt"
+	done
+	[ $txt_count -gt 0 ] && json_select ..
+
 	json_select ..
 }