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LanSync broadcasts and can optionally add discovered hosts to the scan queue. [Ron Bowes, Mak Kolybabi, Andrew Orr, Russ Tait Milne]
110 lines
2.4 KiB
Lua
110 lines
2.4 KiB
Lua
description = [[
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Listens for Dropbox LanSync information broadcasts.
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The Dropbox LanSync protocol broadcasts an opaque set of host and share
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identifiers. It does this every twenty seconds.
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]]
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author = "Ron Bowes, Mak Kolybabi, Andrew Orr, Russ Tait Milne"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"discovery", "safe"}
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require("json")
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require("shortport")
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require("stdnse")
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require("tab")
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require("target")
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local DROPBOX_BROADCAST_PERIOD = 20
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local DROPBOX_PORT = 17500
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prerule = function()
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return true
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end
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action = function()
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-- Start listening for broadcasts.
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local sock = nmap.new_socket("udp")
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sock:set_timeout(2 * DROPBOX_BROADCAST_PERIOD * 1000)
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local status, result = sock:bind(nil, DROPBOX_PORT)
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if not status then
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stdnse.print_debug(1, "Could not bind on port %d: %s", DROPBOX_PORT, result)
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sock:close()
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return
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end
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-- Keep track of the IDs we've already seen.
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local ids = {}
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-- Initialize the output table.
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results = tab.new(6)
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tab.addrow(
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results,
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'displayname',
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'ip',
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'port',
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'version',
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'host_int',
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'namespaces'
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)
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local status, result = sock:receive()
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while status do
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-- Parse JSON.
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local status, info = json.parse(result)
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if status then
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-- Get IP address of broadcasting host.
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local status, _, _, ip, _ = sock:get_info()
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if not status then
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stdnse.print_debug(1, "Failed to get socket info.")
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break
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end
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stdnse.print_debug(1, "Received broadcast from host %s (%s).", info.displayname, ip)
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-- Check if we've already seen this ID.
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if ids[info.host_int] then
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break
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end
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ids[info.host_int] = true
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-- Add host scan list.
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if target.ALLOW_NEW_TARGETS then
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target.add(ip)
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end
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-- Add host to list.
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for _, key1 in pairs({"namespaces", "version"}) do
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for key2, val in pairs(info[key1]) do
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info[key1][key2] = tostring(info[key1][key2])
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end
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end
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tab.addrow(
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results,
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info.displayname,
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ip,
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info.port,
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stdnse.strjoin(".", info.version),
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info.host_int,
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stdnse.strjoin(", ", info.namespaces)
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)
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stdnse.print_debug(1, "Added host %s.", info.displayname)
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end
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status, result = sock:receive()
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end
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sock:close()
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-- If no broadcasts received, don't output anything.
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if table.maxn(ids) == 0 then
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return
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end
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-- Format table, without trailing newline.
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results = tab.dump(results)
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results = results:sub(1, #results - 1)
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return "\n" .. results
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end
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