aredn/files/www/cgi-bin/mesh

#!/usr/bin/lua
--[[

	Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
	Copyright (C) 2021 Tim Wilkinson
	Original Perl Copyright (C) 2015 Conrad Lara
	See Contributors file for additional contributors

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation version 3 of the License.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.

	Additional Terms:

	Additional use restrictions exist on the AREDN(TM) trademark and logo.
		See AREDNLicense.txt for more info.

	Attributions to the AREDN Project must be retained in the source code.
	If importing this code into a new or existing project attribution
	to the AREDN project must be added to the source code.

	You must not misrepresent the origin of the material contained within.

	Modified versions must be modified to attribute to the original source
	and be marked in reasonable ways as differentiate it from the original
	version

--]]

require("nixio")
require("aredn.hardware")
require("aredn.http")
require("aredn.utils")
require("aredn.html")
require("uci")
aredn.info = require("aredn.info")
aredn.olsr = require("aredn.olsr")
require("iwinfo")

local html = aredn.html

local node = aredn.info.get_nvram("node")
if node == "" then
    node = "NOCALL"
end
local tactical = aredn.info.get_nvram("tactical")
local config = aredn.info.get_nvram("config")
if config == "" or nixio.fs.stat("/etc/config.mesh", "type") ~= "dir" then
    config = "not set"
end
local wifiif = aredn.hardware.get_iface_name("wifi")
local my_ip = aredn.hardware.get_interface_ip4(wifiif)
if not my_ip then
    my_ip = "none"
end
local phy = iwinfo.nl80211.phyname(wifiif)
if not phy then
    phy = 0
end

local chanbw = 1
local cb = "/sys/kernel/debug/ieee80211/" .. phy .. "/ath9k/chanbw"
if not nixio.fs.stat(cb) then
    cb = "/sys/kernel/debug/ieee80211/" .. phy .. "/ath10k/chanbw"
end
if nixio.fs.stat(cb) then
    for line in io.lines(cb)
    do
        if line == "0x00000005" then
            chanbw = 4
        elseif line == "0x0000000a" then
            chanbw = 2
        end
        break
    end
end

if not nixio.fs.stat("/tmp/web") then
    nixio.fs.mkdir("/tmp/web")
end

-- post data

if os.getenv("REQUEST_METHOD") == "POST" then
    require('luci.ohttp')
    local request = luci.http.Request(nixio.getenv(),
      function()
        local v = io.read(1024)
        if not v then
            io.close()
        end
        return v
      end
    )
    if request:formvalue("auto") then
        io.open("/tmp/web/automesh", "w"):close()
    end
    if request:formvalue("stop") then
        os.remove("/tmp/web/automesh")
    end
end

local cursor = uci.cursor()
local node_desc = cursor:get("system", "@system[0]", "description")
local lat_lon = "<strong>Location Not Available</strong>"
local lat = cursor:get("aredn", "@location[0]", "lat")
local lon = cursor:get("aredn", "@location[0]", "lon")
if lat and lon then
    lat_lon = string.format("<center><strong>Location: </strong> %s %s</center>", lat, lon)
end

local routes = {}
local links = {}
local neighbor = {}
local wangateway = {}
local ipalias = {}
local localhosts = {}
local dtd = {}
local midcount = {}
local hosts = {}
local services = {}
local history = {}

for i, node in ipairs(aredn.olsr.getOLSRRoutes())
do
    if node.genmask ~= 0 and node.etx <= 50 then
        routes[node.destination] = { etx = node.etx }
    end
end

-- low memory route reduction
local lowmemory = 1024 * tonumber(cursor:get("aredn", "@meshstatus[0]", "lowmem") or 10000)
local lowroutes = tonumber(cursor:get("aredn", "@meshstatus[0]", "lowroutes") or 1000)
if #routes > lowroutes and nixio.sysinfo().freeram < lowmemory then
    local list = {}
    for k,v in pairs(routes)
    do
        list[#list + 1] = { key = k, etx = v.etx }
    end
    table.sort(list, function (a, b) return a.etx < b.etx end)
    for i = lowroutes, #list - 1
    do
        routes[list[i].key] = nil
    end
end

-- load up arpcache
local arpcache = {}
arptable(function(a)
    if a["Flags"] ~= "0x0" and a["HW address"] ~= "00:00:00:00:00:00" then
        arpcache[a["IP address"]] = a
    end
end)

local iwrates
local prefix = "/sys/kernel/debug/ieee80211/" .. phy .. "/netdev:" .. wifiif .. "/stations/"
for i, node in ipairs(aredn.olsr.getOLSRLinks())
do
    links[node.remoteIP] = { lq = node.linkQuality, nlq = node.neighborLinkQuality, mbps = "" }
    neighbor[node.remoteIP] = true
    local mac = arpcache[node.remoteIP]
    if mac then
        if not iwrates then
            iwrates = {}
            local station = {}
            for line in io.popen("iw " .. wifiif .. " station dump"):lines()
            do
                local mac = line:match("^Station (%S+) ")
                if mac then
                    station = {}
                    iwrates[mac] = station
                end
                local txbitrate = line:match("tx bitrate:%s+([%d%.]+) MBit/s")
                if txbitrate then
                    station.txbitrate = txbitrate
                end
            end
        end
        local station = iwrates[mac["HW address"]]
        if station then
            links[node.remoteIP].mbps = string.format("%.1f", tonumber(station.txbitrate) / chanbw)
        end
    end
end

-- discard
arpcache = nil

for i, node in ipairs(aredn.olsr.getOLSRHNA())
do
    if node.destination == "0.0.0.0" then
        wangateway[node.gateway] = true
    end
end

for i, node in ipairs(aredn.olsr.getOLSRMid())
do
    local ip = node.main.ipAddress
    for _, alias in ipairs(node.aliases)
    do
        local aip = alias.ipAddress
        ipalias[aip] = ip
        neighbor[aip] = true
        if links[aip] then
            neighbor[ip] = true
        end
    end
end

-- load the local hosts file
for line in io.lines("/etc/hosts")
do
    if line:match("^10%.") then
        local ip, name = line:match("([%d%.]+)%s+(%S+)")
        if name then
            local name9 = name:sub(1, 9)
            if name9 ~= "localhost" and name9 ~= "localnode" then
                local name7 = name:sub(1, 7)
                if name7 ~= "localap" and name7 ~= "dtdlink" then
                    if not name:match("%.") then
                        name = name .. ".local.mesh"
                    end
                    local tac = line:match("[%d%.]+%s+%S+%s+(%S+)")
                    if not tac then
                        tac = ""
                    end
                    if not localhosts[my_ip] then
                        localhosts[my_ip] = { hosts = {}, noprops = {}, aliases = {}, name = name, tactical = tac }
                    end
                    local host = localhosts[my_ip]
                    if ip == my_ip then
                        host.tactical = tac
                        host.name = name
                    else
                        host.hosts[#host.hosts + 1] = name
                    end
                    if tac == "#NOPROP" then
                        host.noprops[#host.noprops + 1] = name
                    end
                    if tac == "#ALIAS" then
                        host.aliases[#host.aliases + 1] = name
                    end
                end
            end
        end
    end
end

-- load the olsr hosts file
if nixio.fs.stat("/var/run/hosts_olsr.stable") then
    for line in io.lines("/var/run/hosts_olsr.stable")
    do
        local ip, name, originator = line:match("^([%d%.]+)%s+(%S+)%s+%S+%s+(%S+)")
        if ip and originator and originator ~= "myself" and (routes[ip] or routes[originator]) then
            local etx = routes[ip]
            if not etx then
                etx = routes[originator]
            end
            etx = etx.etx
            if not name:match("%.") or name:match("^mid%.[^%.]*$") then
                name = name .. ".local.mesh"
            end
            if ip == originator then
                if not hosts[originator] then
                    hosts[originator] = { hosts = {} }
                end
                local host = hosts[originator]
                if host.name then
                    host.tactical = name
                else
                    host.name = name
                    host.etx = etx
                end
            elseif name:match("^dtdlink%.") then
                dtd[originator] = true
                if links[ip] then
                    links[ip].dtd = true
                end
            elseif name:match("^xlink%d+%.") then
                dtd[originator] = true
                if links[ip] then
                    links[ip].xlink = true
                end
            elseif name:match("^mid%d+%.") then
                if not midcount[originator] then
                    midcount[originator] = 1
                else
                    midcount[originator] = midcount[originator] + 1
                end
                if links[ip] then
                    links[ip].tun = true
                end
            else
                if not hosts[originator] then
                    hosts[originator] = { hosts = {} }
                end
                local host = hosts[originator]
                host.hosts[#host.hosts + 1] = name
            end
        end
    end
end

-- discard
routes = nil

if nixio.fs.stat("/var/run/services_olsr") then
    for line in io.lines("/var/run/services_olsr")
    do
        if line:match("^%w") then
            local url, name = line:match("^(.*)|.*|(.*)$")
            if name then
                local protocol, host, port, path = url:match("^([%w][%w%+%-%.]+)%://(.+):(%d+)/(.*)")
                if path then
                    local name, originator = name:match("(.*%S)%s*#(.*)")
                    if originator == " my own service" or (hosts[originator] and hosts[originator].name) then
                        if not host:match("%.local%.mesh$") then
                            host = host .. ".local.mesh"
                        end
                        if not services[host] then
                            services[host] = {}
                        end
                        if not services[host][name] then
                            if port ~= "0" then
                                services[host][name] = "<a href='" .. protocol .. "://" .. host .. ":" .. port .. "/" .. path .. "' target='_blank'>" .. name .. "</a>"
                            else
                                services[host][name] = name
                            end
                        end
                    end
                end
            end
        end
    end
end

-- load the node history
if nixio.fs.stat("/tmp/node.history") then
    for line in io.lines("/tmp/node.history")
    do
        local ip, age, host = line:match("^(%S+) (%d+) (%S+)")
        if ip and age and host then
            history[ip] = { age = age, host = host:gsub("/", " / ") }
        end
    end
end

------------------
-- generate page
------------------
http_header()
html.header(node .. " mesh status", false)
local automesh = nixio.fs.stat("/tmp/web/automesh");
if automesh then
    html.print("<meta http-equiv='refresh' content='10;url=/cgi-bin/mesh'>")
end
html.print([[
    <style>
    table {
        cellspacing:5px;
        width:80%;
        border-collapse:collapse;
    }
    td {
        padding-left:5px;
    }
    tr {
        vertical-align:top;
        text-align:left;
    }
    tr.spaceUnder>td {
        padding-bottom:2em;
    }
    tr:hover {
        background-color:rgba(128,128,128,0.15);
    }
    tr.h {
        border-top: 1px solid black;
        border-bottom: 1px solid black;
    }
    tr.h:hover {
        background-color:inherit;
    }
    th {
        white-space:nowrap;
        vertical-align:middle;
        padding:3px 5px;
    }
    input.search {
        width:150px;
    }
    #nTable {
        margin-bottom: 12px;
    }
    #nTable th:nth-child(1) {
      width: 25%;
    }
    #nTable th:nth-child(2) {
      width: 45%;
    }
    #nTable th:nth-child(3) {
      width: 30%;
    }
    #cTable {
        margin-bottom: 12px;
    }
    #cTable th:nth-child(1), #rTable th:nth-child(1) {
      width: 25%;
    }
    #cTable th:nth-child(2), #rTable th:nth-child(2) {
      width: 25%;
    }
    #cTable th:nth-child(3), #cTable th:nth-child(4) {
      width: 6%;
    }
    #cTable th:nth-child(5) {
      width: 8%;
    }
    #rTable th:nth-child(3) {
      width: 20%;
    }
    #rTable th:nth-child(4) {
      width: 30%;
    }
    tr.s.f.nf {
        display: table-row;
    }
    tr.s.nf {
        display: none;
    }
    </style>
    <script>
    let searchPending;
    function doSearch() {
        clearTimeout(searchPending);
        searchPending = setTimeout(function() {
            const filter = document.getElementById("srch").value.toUpperCase();
            const rows = document.querySelectorAll("tr.s");
            for (let i = 0; i < rows.length; i++) {
                rows[i].classList.remove("f", "nf");
            }
            const tds = document.querySelectorAll("td.s");
            for (let i = 0; i < tds.length; i++) {
                const td = tds[i];
                const txt = td.textContent || td.innerText;
                if (txt.toUpperCase().indexOf(filter) === -1) {
                    td.parentElement.classList.add("nf")
                }
                else {
                    td.parentElement.classList.add("f")
                }
            }
            const tables = document.querySelectorAll("table.s");
            for (let i = 0; i < tables.length; i++) {
                if (!tables[i].querySelector("tr.f")) {
                    tables[i].style.display = "none";
                }
                else {
                    tables[i].style.display = null;
                }
            }
        }, 300);
    }
    </script>
]])
html.print("</head>")

html.print("<body><form method=post action=/cgi-bin/mesh accept-charset=utf-8 enctype='multipart/form-data'>")
html.print("<input type=hidden name=reload value=1>")
html.print("<center>")
html.alert_banner()
html.print("<h1>" .. node .. " mesh status</h1>")
html.print(lat_lon)
if node_desc then
    html.print("<table id='node_description_display'><tr><td align=center>" .. node_desc .. "</td></tr></table>")
end
html.print("<hr><nobr>")

html.print("<a href='/help.html#meshstatus' target='_blank'>Help</a> &nbsp;&nbsp; ")

if nixio.fs.stat("/tmp/web/automesh") then
    html.print("<input type=submit name=stop value=Stop title='Abort continuous status'>")
else
    html.print("<input type=button name=refresh value=Refresh title='Refresh this page' onclick='window.location.reload();'>")
    html.print("&nbsp;&nbsp;")
    html.print("<input type=submit name=auto value=Auto title='Automatic page refresh'>")
end
if nixio.fs.stat("/tmp/dnsmasq.d/supernode.conf") then
    local ip = read_all("/tmp/dnsmasq.d/supernode.conf"):match("^#(%S+)")
    if ip then
        html.print("&nbsp;&nbsp;")
        html.print("<a target=_blank href='http://" .. ip .. "/cgi-bin/mesh'><button type=button title='See what is on the whole AREDN mesh'>Cloud Mesh</button></a>")
    end
end
html.print("&nbsp;&nbsp;")
html.print("<button type=button onClick='window.location=\"status\"' title='Return to the status page'>Quit</button>")
html.print("&nbsp;&nbsp;")
html.print("<input id=srch type=search autocorrect=off spellcheck=false placeholder='Search...' onkeyup='doSearch()' onsearch='doSearch()' onkeypress='event.keyCode == 13 && event.preventDefault()'>")
html.print("</nobr><br><br>")

if not next(localhosts) and not next(links) then
    html.print("No other nodes are available.")
    html.print("</center></form>")
    html.footer()
    html.print("</body></html>")
    os.exit(0)
end

-- show local node table

html.print("<table id=nTable class=s>")
html.print("<tr class=h>")
html.print("<th width=25%>Node Name</th>")
html.print("<th>LAN Hostname</th>")
html.print("<th>Service Name</th>")
html.print("</tr>")

if next(localhosts) then
    local rows = {}
    for ip, host in pairs(localhosts)
    do
        local localpart = host.name:match("([^.]*)%.")
        if localpart then
            local tactical = ""
            if host.tactical ~= "" then
                tactical = " / " .. host.tactical
            end
            local c1 = localpart .. tactical
            if wangateway[ip] then
                c1 = c1 .. " &nbsp; <small>(wan)</small>"
            end
            local c2 = ""
            local c3 = ""
            if services[host.name] then
                for _, v in pairs(services[host.name])
                do
                    c3 = c3 .. v .. "<br>"
                    c2 = c2 .. "<br>"
                end
            else
                c2 = c2 .. "<br>"
                c3 = c3 .. "<br>"
            end

            -- add locally advertised dmz hosts
            for _, dmzhost in ipairs(host.hosts)
            do
                local nopropd = false
                local aliased = false
                for _, v in ipairs(host.noprops)
                do
                    if v == dmzhost then
                        nopropd = true;
                        break
                    end
                end
                for _, v in ipairs(host.aliases)
                do
                    if v == dmzhost then
                        aliased = true;
                        break
                    end
                end
                local localpart = dmzhost:match("(.*)%.local%.mesh")
                if localpart then
                    if not nopropd and not aliased then
                        c2 = c2 .. localpart
                    elseif aliased then
                        c2 = c2 .. "<span class=aliased-hosts>" .. localpart .. "</span>"
                    else
                        c2 = c2 .. "<span class=hidden-hosts>" .. localpart .. "</span>"
                    end
                    if services[dmzhost] then
                        for n, v in pairs(services[dmzhost])
                        do
                            c3 = c3 .. v .. "<br>"
                            c2 = c2 .. "<br>"
                        end
                    else
                        c2 = c2 .. "<br>"
                        c3 = c3 .. "<br>"
                    end
                end
            end
            -- Build this row
            local row = "<tr class=s><td class='s f'>" .. c1 .. "</td><td class='s f'>" .. c2 .. "</td><td class='s f'>" .. c3 .. "</td></tr>"
            rows[#rows + 1] = { key = host.name, row = row }
        end
    end
    table.sort(rows, function(a,b) return a.key < b.key end)
    for _, row in ipairs(rows)
    do
        html.print(row.row)
    end
    -- discard
    rows = nil
else
    html.print("<tr><td class='s f'>none</td></tr>")
end

-- discard
localhosts = nil
-- end local node table
html.print("</table>")

-- show current neighbors table

html.print("<table id='cTable' class=s><tr class=h>")
html.print("<th width=25%>Current Neighbors</th>")
html.print("<th>LAN Hostname</th>")
html.print("<th>LQ</th><th>NLQ</th><th>TxMbps</th>")
html.print("<th>Service Name</th>")
html.print("</tr>")

local rows = {}
local neighservices = {}
for ip, link in pairs(links)
do
    local ipmain = ipalias[ip]
    if not ipmain then
        ipmain = ip
    end
    local name = ipmain
    local localpart = ipmain
    local tactical = ""
    local host = hosts[ipmain]
    if host then
        if host.name then
            name = host.name
            localpart = name:match("(.*)%.local%.mesh")
            if not localpart then
                localpart = name
            end
        end
        if host.tactical then
            tactical = " / " .. host.tactical
        end
    end
    if rows[name] then
        name = name .. " " -- avoid collision 2 links to same host {rf, dtd}
    end
    local no_space_host = name:match("(.*%S)%s*$")
    local c1 = "<a href='http://" .. no_space_host .. ":8080/'>" .. localpart .. tactical .. "</a>"
    local nodeiface
    if ipmain ~= ip then
        if links[ip].dtd then
            nodeiface = "dtd"
        elseif links[ip].xlink then
            nodeiface = "xlink"
        elseif links[ip].tun then
            nodeiface = "tun"
        else
            nodeiface = "?"
        end
    end
    if wangateway[ip] or wangateway[ipmain] then
        if nodeiface then
            nodeiface = nodeiface .. ",wan"
        else
            nodeiface = "wan"
        end
    end
    if nodeiface then
        c1 = c1 .. " &nbsp; <small>(" .. nodeiface .. ")</small>"
    end
    local c2 = ""
    local c3 = string.format("%.0f%%", 100 * link.lq)
    local c4 = string.format("%.0f%%", 100 * link.nlq)
    local c5 = string.format("%s", link.mbps)
    local c6 = ""

    -- print node services if any
    if not neighservices[name] then
        neighservices[name] = true
        if services[name] then
            for _, v in pairs(services[name])
            do
                c6 = c6 .. v .. "<br>"
                c2 = c2 .. "<br>"
            end
        else
            c2 = c2 .. "<br>"
            c6 = c6 .. "<br>"
        end

        -- add advertised dmz hosts
        if host then
            for _, dmzhost in ipairs(host.hosts)
            do
                local localpart = dmzhost:match("(.*)%.local%.mesh")
                if localpart then
                    c2 = c2 .. localpart
                    if services[dmzhost] then
                        for _, v in pairs(services[dmzhost])
                        do
                            c6 = c6 .. v .. "<br>"
                            c2 = c2 .. "<br>"
                        end
                    else
                        c2 = c2 .. "<br>"
                        c6 = c6 .. "<br>"
                    end
                end
            end
        end
    end
    -- Build this row
    local row = "<tr class=s><td class='s f'>" .. c1 .. "</td><td class='s f'>" .. c2 .. "</td><td>" .. c3 .. "</td><td>" .. c4 .. "</td><td>" .. c5 .. "</td><td class='s f'>" .. c6 .. "</td></tr>"
    rows[#rows + 1] = { key = name, row = row }
end
if #rows > 0 then
    table.sort(rows, function(a,b) return a.key < b.key end)
    for _, row in ipairs(rows)
    do
        html.print(row.row)
    end
    -- discard
    rows = nil
else
    html.print("<tr><td class='s f'>none</td></tr>")
end

--add previous neighbors
local rows = {}
local uptime = nixio.sysinfo().uptime
for ip, node in pairs(history)
do
    if not (links[ip] or links[ipalias[ip]]) then
        local age = uptime - tonumber(node.age)
        local host = node.host
        if host == "" then
            host = ip
        else
            host = host:gsub("^mid%d+%.", ""):gsub("^dtdlink%.", "")
        end
        local row = "<tr><td style='color:sienna;'>" .. host
        if hosts[ip] and hosts[ip].hosts then
            for _, v in ipairs(hosts[ip].hosts)
            do
                row = row .. "<br>" .. v
            end
        end
        row = row .. "</td><td style='color:sienna;'>"
        if age < 3600 then
            local val = math.floor(age / 60)
            if val == 1 then
                row = row .. "1 minute ago"
            else
                row = row .. val .. " minutes ago"
            end
        else
            local val = string.format("%.1f", age / 3600)
            if val == "1.0" then
                row = row .. "1 hour ago"
            else
                row = row .. val .. " hours ago"
            end
        end
        row = row .. "</td></tr>"
        rows[#rows + 1] = { key = age, row = row }
    end
end
if #rows > 0 then
    html.print("<tr><td style='color:sienna;font-weight:bold;padding-top:10px;'>Previous Neighbors</td></tr>")
    table.sort(rows, function(a,b) return a.key < b.key end)
    for _, row in ipairs(rows)
    do
        html.print(row.row)
    end
    -- discard
    rows = nil
end
-- end current neighbors table
html.print("</table>")

-- show remote node table

html.print("<table id='rTable' class=s><tr class=h>")
html.print("<th width=25%>Remote Nodes</th>")
html.print("<th>LAN Hostname</th>")
html.print("<th>ETX</th>")
html.print("<th>Service Name</th>")
html.print("</tr>")

local rows = {}
for ip, host in pairs(hosts)
do
    local c1,c2,c3,c4
    if not neighbor[ip] and host.name then
        local localpart = host.name:match("(.*)%.local%.mesh")
        if localpart then
            local tactical = ""
            if host.tactical then
                tactical = " / " .. host.tactical
            end
            local etx = string.format("%.2f", host.etx)
            c1 = "<a href='http://" .. host.name .. ":8080/'>" .. localpart .. tactical .. "</a>"
            local nodeiface
            local mycount = 0
            if midcount[ip] then
                mycount = midcount[ip]
            end
            if dtd[ip] then
                mycount = mycount - 1
            end
            if hosts[ip].tactical then
                mycount = mycount - 1
            end
            if mycount > 0 then
                nodeiface = "tun*" .. mycount
            end
            if wangateway[ip] then
                if nodeiface then
                    nodeiface = nodeiface .. ",wan"
                else
                    nodeiface = "wan"
                end
            end
            if nodeiface then
                c1 = c1 .. " &nbsp; <small>(" .. nodeiface .. ")</small>"
            end
            c2 = "<br>"
            c3 = string.format("%s", etx)

            -- print node services if any
            if services[host.name] then
                local i=1
                for _, v in pairs(services[host.name])
                do
                    if c4 then
                        c4 = c4 .. v .. "<br>"
                    else
                        c4 = v .. "<br>"
                    end
                    if i > 1 then c2 = c2 .. "<br>" end
                    i=i+1
                end
            else
                if c4 then
                    c4 = c4 .. "<br>"
                else
                    c4 = "<br>"
                end
            end

            -- add locally advertised dmz hosts
            for _, dmzhost in ipairs(host.hosts)
            do
                local localpart = dmzhost:match("(.*)%.local%.mesh")
                if localpart then
                    c2 = c2 .. localpart .. "<br>"
                    if services[dmzhost] then
                        local i=1
                        for _, v in pairs(services[dmzhost])
                        do
                            if c4 then
                                c4 = c4 .. v .. "<br>"
                            else
                                c4 = v .. "<br>"
                            end
                            if i > 1 then c2 = c2 .. "<br>" end
                            i=i+1
                        end
                    else
                        if c4 then
                            c4 = c4 .. "<br>"
                        else
                            c4 = "<br>"
                        end
                    end
                end
            end
            -- Build this row
            local row = "<tr class=s><td class='s f'>" .. c1 .. "</td><td class='s f'>" .. c2 .. "</td><td>" .. c3 .. "</td><td class='s f'>" .. c4 .. "</td></tr>"
            rows[#rows + 1] = { key = host.etx, row = row }
        end
    end
end

if #rows > 0 then
    table.sort(rows, function(a,b) return a.key < b.key end)
    for _, row in ipairs(rows)
    do
        html.print(row.row)
    end
    -- discard
    rows = nil
else
    html.print("<tr><td class='s f'>none</td></tr>")
end
-- discard
neighbor = nil
dtd = nil
midcount = nil
wangateway = nil
services = nil

-- discard
links = nil
ipalias = nil
hosts = nil
history = nil
-- end remote nodes table
html.print("</table>")

html.print("</center>")
html.print("</form>")
html.footer();
html.print("</body>")
html.print("</html>")