Add luci-app-packet-capture

luci-app-packet-capture/root/usr/libexec/packet_capture

@@ -0,0 +1,64 @@
+#!/usr/bin/env lua
+
+local ubus = require "ubus"
+local fs = require "nixio.fs"
+
+local conn = ubus.connect()
+if not conn then
+	error("Failed to connect to ubus")
+	return
+end
+
+local args = "-n"
+local duration = ""
+
+if arg[1] ~= nil then
+	args = arg[1]
+	if arg[2] ~= "" then
+		duration = arg[2]
+	end
+end
+
+local filter = fs.stat("/tmp/tcpdump_filter")
+if filter then
+	args = args .. " -F /tmp/tcpdump_filter"
+end
+
+local ubus_objects = {
+	tcpdump = {
+	}
+}
+
+conn:add( ubus_objects )
+
+os.execute("sleep 1")
+
+local command = "tcpdump -l " .. args .. " 2>&1"
+
+if duration ~= "" then
+	command = "timeout " .. duration .. " " .. command
+end
+
+local pipe = io.popen(command)
+
+for line in pipe:lines() do
+		local params = {
+				data = line
+		}
+		conn:notify(ubus_objects.tcpdump.__ubusobj, "tcpdump.data", params)
+end
+
+local pcap = fs.stat("/tmp/capture.pcap0")
+if pcap then
+	fs.move("/tmp/capture.pcap0","/tmp/capture.pcap")
+	fs.remove("/tmp/capture.pcap1")
+end
+
+if filter then
+	fs.remove("/tmp/tcpdump_filter")
+end
+
+conn:close()
+pipe:close()
+
+fs.remove("/var/run/packet_capture.pid")