mirror of https://github.com/aredn/aredn.git
Scan cache (#1160)
* Cache the last wifi scan and update it when a re-scan is requested. This change was suggested as a way of handling Ubiquiti AC devices which disconnect while scanning and making retrieving the results problematic if that was your connection. Now we scan and store the results so they can be retrieved later. In fact we no longer scan when navigating to this page but require an explicity scan button push. This make the page generally more responsive when initially navigated to.
This commit is contained in:
Tim Wilkinson
GitHub
parent
c25be28b97
commit
86271040a0
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@ -36,6 +36,7 @@
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--]]
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require("nixio")
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require("luci.jsonc")
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require("aredn.http")
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require("aredn.hardware")
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require("aredn.utils")
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@ -55,125 +56,208 @@ if board_type:match("^ubnt,") and board_type:match("ac") then
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ubnt_ac = true
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end
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local channels = aredn.hardware.get_rfchannels(wifiiface)
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local scan_list = ""
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for _, channel in ipairs(channels)
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do
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scan_list = scan_list .. " " .. channel.frequency
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end
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local rescan = string.find((nixio.getenv("QUERY_STRING") or ""):lower(),"rescan=1")
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-- scan start
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local scanned = {}
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local f = io.popen("iw dev " .. wifiiface .. " station dump")
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if f then
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local scan = {}
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local myssid = aredn.info.getSSID()
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for line in f:lines()
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do
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local m = line:match("^Station ([%da-fA-F:]+) %(on " .. wifiiface .. "%)")
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if m then
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scan = scanned[m]
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if not scan then
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scan = {
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mac = m,
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signal = 9999,
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freq = {},
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key = "",
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joined = false
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}
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scanned[m] = scan
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end
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scan.mode = "Connected Ad-Hoc Station"
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scan.ssid = myssid
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scan.freq[myfreq] = true
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end
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m = line:match("signal avg:%s+([%d%-]+)")
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if m then
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scan.signal = tonumber(m)
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end
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local scanlist = {}
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-- Show the last scan if we have one, it's not too old, and we're not rescanning
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if not rescan then
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local lscan = io.open("/tmp/last-scan.json")
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if lscan then
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scanlist = luci.jsonc.parse(lscan:read("*a") or "")
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lscan:close()
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end
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f:close()
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end
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-- Ubiquiti AC device workaround
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if ubnt_ac then
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os.execute("iw dev " .. wifiiface .. " ibss leave > /dev/null 2>&1")
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os.execute("wifi up > /dev/null 2>&1")
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local attempt = 10
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while attempt > 0
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if rescan then
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local channels = aredn.hardware.get_rfchannels(wifiiface)
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local scan_list = ""
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for _, channel in ipairs(channels)
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do
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attempt = attempt - 1
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for line in io.popen("iw dev " .. wifiiface .. " scan"):lines()
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scan_list = scan_list .. " " .. channel.frequency
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end
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-- scan start
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local scanned = {}
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local f = io.popen("iw dev " .. wifiiface .. " station dump")
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if f then
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local scan = {}
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local myssid = aredn.info.getSSID()
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for line in f:lines()
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do
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if line:match("^BSS ") then
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attempt = 0
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local m = line:match("^Station ([%da-fA-F:]+) %(on " .. wifiiface .. "%)")
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if m then
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scan = scanned[m]
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if not scan then
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scan = {
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mac = m,
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signal = 9999,
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freq = {},
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key = "",
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joined = false
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}
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scanned[m] = scan
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end
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scan.mode = "Connected Ad-Hoc Station"
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scan.ssid = myssid
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scan.freq[tostring(myfreq)] = true
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end
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m = line:match("signal avg:%s+([%d%-]+)")
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if m then
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scan.signal = tonumber(m)
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end
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break
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end
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nixio.nanosleep(2, 0)
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f:close()
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end
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end
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local f = io.popen("iw dev " .. wifiiface .. " scan freq" .. scan_list .. " passive")
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if f then
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local scan = {}
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for line in f:lines()
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-- Ubiquiti AC device workaround
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if ubnt_ac then
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os.execute("iw dev " .. wifiiface .. " ibss leave > /dev/null 2>&1")
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os.execute("wifi up > /dev/null 2>&1")
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local attempt = 10
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while attempt > 0
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do
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attempt = attempt - 1
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for line in io.popen("iw dev " .. wifiiface .. " scan"):lines()
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do
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if line:match("^BSS ") then
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attempt = 0
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end
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break
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end
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nixio.nanosleep(2, 0)
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end
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end
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local f = io.popen("iw dev " .. wifiiface .. " scan freq" .. scan_list .. " passive")
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if f then
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local scan = {}
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for line in f:lines()
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do
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local m = line:match("^BSS ([%da-fA-F:]+)")
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if m then
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scan = scanned[m]
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if not scan then
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scan = {
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mac = m,
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mode = "AP",
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ssid = "",
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signal = 9999,
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freq = {},
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key = "",
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joined = false
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}
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scanned[m] = scan
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elseif scan.joined then
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scan = {
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freq = {}
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}
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end
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if line:match("joined") then
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scan.mode = "My Ad-Hoc Network"
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scan.joined = true
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end
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end
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m = line:match("freq: (%d+)")
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if m then
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scan.freq[m] = true
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if tonumber(m) == myfreq and scan.mode == "AP" then
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scan.mode = "My Ad-Hoc Network"
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scan.joined = true
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end
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end
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m = line:match("SSID: (.+)")
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if m then
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scan.ssid = m
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end
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m = line:match("signal: ([%d%-]+)")
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if m then
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scan.signal = tonumber(m)
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end
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m = line:match("Group cipher: (.+)")
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if m then
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scan.key = m
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end
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if line:match("capability: IBSS") and scan.mode == "AP" then
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scan.mode = "Foreign Ad-Hoc Network"
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end
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end
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f:close()
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end
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-- scan end
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-- load arp cache
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local arpcache = {}
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arptable(function(a)
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arpcache[a["HW address"]] = a["IP address"]
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end)
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scanlist = {}
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for _, v in pairs(scanned)
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do
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local m = line:match("^BSS ([%da-fA-F:]+)")
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if m then
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scan = scanned[m]
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if not scan then
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scan = {
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mac = m,
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mode = "AP",
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ssid = "",
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signal = 9999,
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freq = {},
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key = "",
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joined = false
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}
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scanned[m] = scan
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elseif scan.joined then
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scan = {
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freq = {}
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}
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end
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if line:match("joined") then
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scan.mode = "My Ad-Hoc Network"
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scan.joined = true
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end
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end
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m = line:match("freq: (%d+)")
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if m then
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scan.freq[m] = true
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if tonumber(m) == myfreq and scan.mode == "AP" then
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scan.mode = "My Ad-Hoc Network"
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scan.joined = true
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end
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end
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m = line:match("SSID: (.+)")
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if m then
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scan.ssid = m
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end
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m = line:match("signal: ([%d%-]+)")
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if m then
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scan.signal = tonumber(m)
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end
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m = line:match("Group cipher: (.+)")
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if m then
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scan.key = m
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end
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if line:match("capability: IBSS") and scan.mode == "AP" then
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scan.mode = "Foreign Ad-Hoc Network"
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if v.signal ~= 9999 or v.joined then
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scanlist[#scanlist + 1] = v
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end
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end
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f:close()
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table.sort(scanlist, function(a, b) return a.signal > b.signal end)
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for _, scan in ipairs(scanlist)
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do
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-- freq to chan
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local chan = {}
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for f, _ in pairs(scan.freq)
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do
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f = tonumber(f)
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if f < 256 then
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elseif f == 2484 then
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chan[#chan + 1] = 14
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elseif f == 2407 then
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chan[#chan + 1] = 0
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elseif f < 2484 then
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chan[#chan + 1] = (f - 2407) / 5
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elseif f < 5000 then
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elseif f < 5380 then
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chan[#chan + 1] = (f - 5000) / 5
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elseif f < 5500 then
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chan[#chan + 1] = f - 2000
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elseif f < 6000 then
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chan[#chan + 1] = (f - 5000) / 5
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end
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end
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table.sort(chan)
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scan.chan = table.concat(chan, " ")
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if scan.joined then
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scan.hostname = node
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else
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-- ip lookup then host lookup
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local ip = arpcache[scan.mac]
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if ip then
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scan.hostname = ip
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local f = io.popen("nslookup " .. ip)
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if f then
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for line in f:lines()
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do
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local m = line:match("name = (.*)%.local%.mesh")
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if m then
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scan.hostname = m:gsub("^mid[0-9]*%.",""):gsub("^dtdlink%.",""):gsub("%.local%.mesh$","")
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break
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end
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end
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f:close()
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end
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else
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scan.hostname = "-"
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end
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end
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end
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lscan = io.open("/tmp/last-scan.json", "w")
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if lscan then
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lscan:write(luci.jsonc.stringify(scanlist, true))
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lscan:close()
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end
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end
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-- scan end
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-- generate page
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http_header()
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html.header(node .. " WiFi scan", false)
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@ -181,21 +265,30 @@ local autoscan = string.find((nixio.getenv("QUERY_STRING") or ""):lower(),"autos
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if autoscan then
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html.print("<script>setTimeout(function(){ window.location.reload(); }, 10000);</script>")
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end
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if rescan then
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html.print([[
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<script>
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if (history.replaceState) {
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history.replaceState(null, "", window.location.origin + window.location.pathname)
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}
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</script>
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]])
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end
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html.print([[
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<script src="/js/sorttable-min.js"></script>
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<style>
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table {
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border-collapse:collapse;
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}
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table.sortable thead {
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background-color:#eee;
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color:#666666;
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table.sortable thead {
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background-color:#eee;
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color:#666666;
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font-weight: bold;
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cursor: default;
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}
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cursor: default;
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}
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</style>
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</head>
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<body><form method=post action=/cgi-bin/scan enctype='multipart/form-data'>
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<body>
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<center>
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]])
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@ -205,9 +298,11 @@ html.print("<h1>" .. node .. " WiFi scan</h1><hr>")
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if autoscan then
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html.print("<input type=button name=stop value=Stop title='Abort continuous scan' onclick='window.location = window.location.origin + window.location.pathname'>")
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else
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html.print("<input type=button name=refresh value=Refresh title='Refresh this page' onclick='window.location.reload();'>")
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html.print(" ")
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html.print([[<input type=button name=auto value=Auto title='Begin continuous scan' onclick='window.location = window.location.origin + window.location.pathname + "?autoscan=1"'>]])
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html.print([[<input type=button name=refresh value=Rescan title='Run a new scan' onclick='window.location = window.location.origin + window.location.pathname + "?rescan=1"'>]])
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if not ubnt_ac then
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html.print(" ")
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html.print([[<input type=button name=auto value=Auto title='Begin continuous scan' onclick='window.location = window.location.origin + window.location.pathname + "?autoscan=1"'>]])
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end
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end
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html.print(" ")
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@ -217,77 +312,34 @@ html.print("<button type=button onClick='window.location=\"status\"' title='Retu
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html.print("<table class=sortable border=1 cellpadding=5>")
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html.print("<tr><th>SNR</th><th>Signal</th><th>Chan</th><th>Enc</th><th>SSID</th><th>Hostname</th><th>MAC/BSSID</th><th>802.11 Mode</th></tr>")
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-- load arp cache
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local arpcache = {}
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arptable(function(a)
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arpcache[a["HW address"]] = a["IP address"]
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end)
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local scanlist = {}
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for _, v in pairs(scanned)
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do
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if v.signal ~= 9999 or v.joined then
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scanlist[#scanlist + 1] = v
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end
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end
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table.sort(scanlist, function(a, b) return a.signal > b.signal end)
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for _, scan in ipairs(scanlist)
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do
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-- freq to chan
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local chan = {}
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for f, _ in pairs(scan.freq)
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do
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f = tonumber(f)
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if f < 256 then
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elseif f == 2484 then
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chan[#chan + 1] = 14
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elseif f == 2407 then
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chan[#chan + 1] = 0
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elseif f < 2484 then
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chan[#chan + 1] = (f - 2407) / 5
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elseif f < 5000 then
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elseif f < 5380 then
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chan[#chan + 1] = (f - 5000) / 5
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elseif f < 5500 then
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chan[#chan + 1] = f - 2000
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elseif f < 6000 then
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chan[#chan + 1] = (f - 5000) / 5
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end
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end
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table.sort(chan)
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chan = table.concat(chan, " ")
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if scan.joined then
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hostname = node
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else
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-- ip lookup then host lookup
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local ip = arpcache[scan.mac]
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if ip then
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hostname = ip
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local f = io.popen("nslookup " .. ip)
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if f then
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for line in f:lines()
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do
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local m = line:match("name = (.*)%.local%.mesh")
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if m then
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hostname = m:gsub("^mid[0-9]*%.",""):gsub("^dtdlink%.",""):gsub("%.local%.mesh$","")
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break
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end
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end
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f:close()
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end
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else
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hostname = "-"
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end
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end
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if scan.ssid:match("^AREDN-") then
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html.print("<tr class=\"wscan-row-node\">")
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else
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html.print("<tr>")
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end
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html.print("<td>" .. (scan.signal - nf) .. "</td><td>" .. scan.signal .. "</td><td>" .. chan .. "</td><td>" .. scan.key .. "</td><td>" .. scan.ssid .. "</td><td align=center>" .. hostname .. "</td><td>" .. scan.mac:upper() .. "</td><td>" .. scan.mode .. "</td>")
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html.print("<td>" .. (scan.signal - nf) .. "</td><td>" .. scan.signal .. "</td><td>" .. scan.chan .. "</td><td>" .. scan.key .. "</td><td>" .. scan.ssid .. "</td><td align=center>" .. scan.hostname .. "</td><td>" .. scan.mac:upper() .. "</td><td>" .. scan.mode .. "</td>")
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html.print("</tr>")
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end
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html.print("</table><br></center>")
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html.print("</table><br>")
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local lastscan = nixio.fs.stat("/tmp/last-scan.json", "mtime")
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if lastscan then
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lastscan = os.time() - lastscan
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if lastscan == 1 then
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html.print("<div>Last scan: 1 second ago")
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elseif lastscan < 60 then
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html.print("<div>Last scan: " .. lastscan .. " seconds ago")
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elseif lastscan < 120 then
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html.print("<div>Last scan: 1 minute ago")
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elseif lastscan < 3600 then
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html.print("<div>Last scan: " .. math.floor(lastscan / 60) .. " minutes ago")
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else
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html.print("<div>Last scan: a long time ago")
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end
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else
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html.print("<div>Last scan: none")
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end
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html.footer()
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html.print("</body></html>")
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html.print("</center></body></html>")
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