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

	Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
	Copyright (C) 2021 Tim Wilkinson
	Original Perl Copyright (c) 2015 Darryl Quinn
	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.http")
require("aredn.utils")
require("aredn.html")
require("aredn.hardware")
aredn.info = require("aredn.info")
require("uci")

local html = aredn.html

local cursor = uci.cursor("/etc/config.mesh");

local node = aredn.info.get_nvram("node")
if node == "" then
    node = "NOCALL"
end

local is_supernode = cursor:get("aredn", "@supernode[0]", "enable") == "1"

-- post_data
local parms = {}
if os.getenv("REQUEST_METHOD") == "POST" then
    require('luci.http')
    local request = luci.http.Request(nixio.getenv(),
      function()
        local v = io.read(1024)
        if not v then
            io.close()
        end
        return v
      end
    )
    parms = request:formvalue()
end

-- wireguard
local wireguard_alive_time = 300 -- 5 minutes
local active_wgtun = {}

-- helpers start

local cli_err = {}
function err(msg)
    cli_err[#cli_err + 1] = msg
end
local errors = {}
function err2(msg)
    errors[#errors + 1] = msg
end

local hidden = {}
function hide(inp)
    hidden[#hidden + 1] = inp
end

function get_active_tun()
    local tuns = {}
    local f = io.popen("ps -w | grep vtun | grep ' tun '")
    if f then
        for line in f:lines()
        do
            local m = line:match(".*:.*-(172%-.*)%stun%stun.*")
            if m then
                tuns[#tuns + 1] = m:gsub("-", ".")
            end
        end
        f:close()
    end
    return tuns
end

function get_active_wgtun()
    local tuns = {}
    local f = io.popen("/usr/bin/wg show all latest-handshakes")
    if f then
        for line in f:lines()
        do
            local k,v = line:match("^%S+%s+(%S+)%s+(%S+)%s*$")
            if k then
                tuns[k] = tonumber(v) -- time in seconds
            end
        end
        f:close()
    end
    return tuns
end

function is_tunnel_active(ip, tunnels)
    for _, aip in ipairs(tunnels)
    do
        if ip == aip then
            return true
        end
    end
    return false
end

function is_wgtunnel_active(client_pub)
    local v = active_wgtun[client_pub]
    if v and v + wireguard_alive_time > os.time() then
        return true
    end
    return false
end

function get_server_network_address()
    local server_net = cursor:get("vtun", "@network[0]", "start")
    if not server_net then
        local mac = aredn.hardware.get_interface_mac("eth0")
        local a, b = mac:match("^..:..:..:..:(..):(..)$")
        local net_base = "172.31."
        if is_supernode then
            net_base = "172.30."
        end
        server_net = net_base .. tonumber(b, 16) .. "." .. ((tonumber(a, 16) * 4) % 256)
    end
    local a, b, c, d = server_net:match("^(%d+).(%d+).(%d+).(%d+)$")
    return { a, b, c, d }
end

function get_wireguard_network_address(netw)
    local c = netw[3] + 1
    if c > 255 then
        c = 0
    end
    return { netw[1], netw[2], c, netw[4] }
end

function get_server_dns()
    local dns = cursor:get("vtun", "@network[0]", "dns")
    return dns and dns or ""
end

-- helper end

-- load client info from uci
local gci_vars = { "enabled", "name", "passwd", "netip", "contact" }
function get_client_info()
    local c = 0
    cursor:foreach("vtun", "client",
        function(section)
            for _, var in ipairs(gci_vars)
            do
                local key = "client" .. c .. "_" .. var
                parms[key] = section[var]
                if not parms[key] then
                    parms[key] = ""
                end
            end
            c = c + 1
        end
    )
    parms.client_num = c
end
-- wireguard
local gci_vars = { "enabled", "name", "key", "clientip", "contact" }
function get_wgclient_info()
    local c = 0
    cursor:foreach("wireguard", "client",
        function(section)
            for _, var in ipairs(gci_vars)
            do
                local key = "wgclient" .. c .. "_" .. var
                parms[key] = section[var]
                if not parms[key] then
                    parms[key] = ""
                end
            end
            c = c + 1
        end
    )
    parms.wgclient_num = c
end

if parms.button_reboot then
    aredn.html.reboot()
end

if nixio.fs.stat("/tmp/reboot-required") then
    http_header();
    html.header(node .. " setup", true);
    html.print("<body><center>")
    html.alert_banner()
    html.navbar_admin("vpn")
    html.print("<table width=790><tr><td>")
    html.print("<tr><td align=center><br>")
    html.print("<b>The configuration has been changed.<br>This page will not be available until the node is rebooted.</b>")
    html.print("<form method='post' action='/cgi-bin/vpn' enctype='multipart/form-data'>")
    html.print("<input type=submit name=button_reboot value='Click to REBOOT' />")
    html.print("</form>")
    html.print("</td></tr>")
    html.print("</table></center></body></html>")
    http_footer()
    os.exit();
end

if parms.button_reset then
    cursor:revert("vtun")
    cursor:delete("vtun", "@options[0]", "port")
    cursor:delete("vtun", "@network[0]", "start")
    cursor:delete("vtun", "@network[0]", "dns")
end

-- get vtun network address
local netw = get_server_network_address()
local dns = get_server_dns()

-- if RESET or FIRST TIME load client/servers from file into parms
if parms.button_reset or not parms.reload then
    cursor:revert("vtun")
    get_client_info()
    get_wgclient_info()
    parms.server_net1 = netw[3]
    parms.server_net2 = netw[4]
    parms.dns = dns
    -- initialize the "add" entries to clear them
    parms.client_add_enabled = "0"
    parms.client_add_name = ""
    parms.client_add_passwd = ""
    parms.wgclient_add_enabled = "0"
    parms.wgclient_add_name = ""
    parms.wgclient_add_key = ""
end

local list = {}
for i = 0,parms.client_num-1
do
    list[#list + 1] = i
end
list[#list + 1] = "_add"
local client_num = 0

local vars = { "enabled", "name", "passwd", "netip", "contact" }
local vars2 = { "net", "enabled", "name", "passwd", "netip", "contact" }
for _, val in ipairs(list)
do
    for _ = 1,1
    do
        for _, var in ipairs(vars)
        do
            local varname = "client" .. val .. "_" .. var
            if var == "enabled" and not parms[varname] then
                parms[varname] = "0"
            elseif not parms[varname] then
                parms[varname] = ""
            elseif var == "contact" then
                parms[varname] = parms[varname]:gsub("^%s+", ""):gsub("%s+$", ""):sub(1,210):gsub('"',"&quot;"):gsub("'","&apos;"):gsub("<","&lt;"):gsub(">","&gt;")
            else
                parms[varname] = parms[varname]:gsub("^%s+", ""):gsub("%s+$", "")
            end
            if val ~= "_add" and parms[varname] == "" and var == "enabled" then
                parms[varname] = "0"
            end
            _G[var] = parms[varname]
        end

        if val == "_add" and not ((enabled ~= "0" or name ~= "" or passwd ~= "" or contact ~= "") and (parms.client_add or parms.button_save)) then
            break
        end

        if val == "_add" and parms.button_save then
            err(val .. " this client must be added or cleared out before saving changes")
            break
        end
        if passwd == "" then
            err("A client password is required")
        end
        if passwd:match("[^%w@]") then
            err("The password cannot contain non-alphanumeric characters (#" .. client_num .. ")")
        end
        if not passwd:match("%a") then
            err("The password must contain at least one alphabetic character (#" .. client_num .. ")")
        end
        if name == "" then
            err("A client name is required")
        end

        if val == "_add" and #cli_err > 0 and cli_err[#cli_err]:match("^" .. val .. " ") then
            break
        end

        parms["client" .. client_num .. "_enabled"] = enabled
        parms["client" .. client_num .. "_name"] = name:upper()
        parms["client" .. client_num .. "_passwd"] = passwd
        parms["client" .. client_num .. "_netip"] = netip
        parms["client" .. client_num .. "_contact"] = contact

        -- commit the data from this client
        client_num = client_num + 1

        -- clear out the ADD values
        if val == "_add" then
            for _, var in ipairs(vars2)
            do
                parms["client_add_" .. var] = ""
            end
        end
    end
end
parms.client_num = client_num

local is_new_supernode = false
if client_num == 0 and is_supernode then
    is_new_supernode = true
end

-- wireguard
local vars = { "enabled", "name", "key", "clientip", "contact" }
local wgclient_num = 0
for val = 0, parms.wgclient_num
do
    if val == tonumber(parms.wgclient_num) then
        val = "_add"
    end
    for _ = 1,1
    do
        for _, var in ipairs(vars)
        do
            local varname = "wgclient" .. val .. "_" .. var
            if var == "enabled" and not parms[varname] then
                parms[varname] = "0"
            elseif not parms[varname] then
                parms[varname] = ""
            elseif var == "contact" then
                parms[varname] = parms[varname]:gsub("^%s+", ""):gsub("%s+$", ""):sub(1,210):gsub('"',"&quot;"):gsub("'","&apos;"):gsub("<","&lt;"):gsub(">","&gt;")
            else
                parms[varname] = parms[varname]:gsub("^%s+", ""):gsub("%s+$", "")
            end
            if val ~= "_add" and parms[varname] == "" and var == "enabled" then
                parms[varname] = "0"
            end
            _G[var] = parms[varname]
        end

        if val == "_add" and not ((enabled ~= "0" or name ~= "" or contact ~= "") and (parms.wgclient_add or parms.button_save)) then
            break
        end

        if val == "_add" and parms.button_save then
            err(val .. " this wireguard client must be added or cleared out before saving changes")
            break
        end
        if name == "" then
            err("A client name is required")
        end

        if val == "_add" and #cli_err > 0 and cli_err[#cli_err]:match("^" .. val .. " ") then
            break
        end

        -- Generate a new key if we chance the client name
        local cname = cursor:get("wireguard", "client_" .. wgclient_num, "name") or ""
        local ckey = cursor:get("wireguard", "client_" .. wgclient_num, "key") or ""
        if key == ckey and name ~= cname and name ~= "" then
            key = ""
        end
        if key == "" then
            local privS = capture("/usr/bin/wg genkey"):match("(%S+)")
            local pubS = capture("echo " .. privS .. " | /usr/bin/wg pubkey"):match("(%S+)")
            local privC = capture("/usr/bin/wg genkey"):match("(%S+)")
            local pubC = capture("echo " .. privC .. " | /usr/bin/wg pubkey"):match("(%S+)")
            key = privS .. pubS .. privC .. pubC
        end

        parms["wgclient" .. wgclient_num .. "_enabled"] = enabled
        parms["wgclient" .. wgclient_num .. "_name"] = name:upper()
        parms["wgclient" .. wgclient_num .. "_key"] = key
        parms["wgclient" .. wgclient_num .. "_clientip"] = clientip
        parms["wgclient" .. wgclient_num .. "_port"] = port
        parms["wgclient" .. wgclient_num .. "_contact"] = contact

        -- commit the data from this client
        wgclient_num = wgclient_num + 1

        -- clear out the ADD values
        if val == "_add" then
            for _, var in ipairs(vars)
            do
                parms["wgclient_add_" .. var] = ""
            end
        end
    end
end
parms.wgclient_num = wgclient_num


-- SAVE the server network numbers and dns into the UCI
if parms.server_wgnet1 then
    netw[3] = parms.server_wgnet1 - 1
    if netw[3] < 0 then
        netw[3] = 255
    end
else
    netw[3] = parms.server_net1
end
if not tonumber(netw[3]) or tonumber(netw[3]) < 0 or tonumber(netw[3]) > 255 then
    err("The third octet of the network MUST be from 0 to 255")
end
if parms.server_wgnet2 then
    netw[4] = parms.server_wgnet2
    if not tonumber(netw[4]) or tonumber(netw[4]) % 4 ~= 0 then
        err("The last octet of the network MUST be a multiple of 2 (ie. 2,4,6,8,10,...)")
    end
else
    netw[4] = parms.server_net2
    if not tonumber(netw[4]) or tonumber(netw[4]) % 4 ~= 0 then
        err("The last octet of the network MUST be a multiple of 4 (ie. 0,4,8,12,16,...)")
    end
end
if not tonumber(netw[4]) or tonumber(netw[4]) < 0 or tonumber(netw[4]) > 255 then
    err("The last octet of the network MUST be from 0 to 255")
end
dns = parms.dns
if not validate_fqdn(dns) then
    err("Not a valid DNS name")
end
if #cli_err == 0 then
    local net_base = "172.31."
    if is_supernode then
        net_base = "172.30."
        cursor:set("vtun", "@options[0]", "port", "5526")
    else
        cursor:delete("vtun", "@options[0]", "port")
    end
    local net = net_base .. netw[3] .. "." .. netw[4]
    cursor:set("vtun", "@network[0]", "start", net)
    cursor:set("vtun", "@network[0]", "dns", dns)
end
local netwg = get_wireguard_network_address(netw)

-- SAVE the clients
local enabled_count = 0
for i = 0,client_num-1
do
    local clientx = "client" .. i
    local client_x = "client_" .. i

    local net = parms[clientx .. "_netip"]
    local vtun_node_name = (parms[clientx .. "_name"]:sub(1,23) .. "-" .. net:gsub("%.", "-")):upper()
    local base = ip_to_decimal(net)
    local clientip = decimal_to_ip(base + 1)
    local serverip = decimal_to_ip(base + 2)

    if not cursor:get("vtun", client_x) then
        cursor:set("vtun", client_x, 'client')
    end

    cursor:set("vtun", client_x, "netip", net)
    cursor:set("vtun", client_x, "enabled", parms[clientx .. "_enabled"])
    cursor:set("vtun", client_x, "name", parms[clientx .. "_name"])
    cursor:set("vtun", client_x, "contact", parms[clientx .. "_contact"])
    cursor:set("vtun", client_x, "passwd", parms[clientx .. "_passwd"])
    cursor:set("vtun", client_x, "clientip", clientip)
    cursor:set("vtun", client_x, "serverip", serverip)
    cursor:set("vtun", client_x, "node", vtun_node_name)

    if parms[clientx .. "_enabled"] == "1" then
        enabled_count = enabled_count + 1
    end
end
-- wireguard
for i = 0,wgclient_num-1
do
    local clientx = "wgclient" .. i
    local client_x = "client_" .. i

    if not cursor:get("wireguard", client_x) then
        cursor:set("wireguard", client_x, 'client')
    end

    cursor:set("wireguard", client_x, "enabled", parms[clientx .. "_enabled"])
    cursor:set("wireguard", client_x, "name", parms[clientx .. "_name"])
    cursor:set("wireguard", client_x, "contact", parms[clientx .. "_contact"])
    cursor:set("wireguard", client_x, "key", parms[clientx .. "_key"])
    cursor:set("wireguard", client_x, "clientip", parms[clientx .. "_clientip"])
end

-- save configuration (commit)
if parms.button_save and #cli_err == 0 then
    cursor:commit("vtun")
    cursor:commit("wireguard")
    os.execute("/usr/local/bin/node-setup > /dev/null 2>&1")
    os.execute("/usr/local/bin/restart-services.sh network tunnels olsrd > /dev/null 2>&1")
end

local active_tun = get_active_tun()
active_wgtun = get_active_wgtun()

-- generate the page

http_header()
html.header(node .. " setup", true)
html.print("<body><center>")
html.alert_banner()
html.print("<form id=vpn method=post action=/cgi-bin/vpn enctype='multipart/form-data'>")

-- navigation bar
html.navbar_admin("vpn")

html.print("<table width=850>")

-- control buttons
html.print("<tr><td align=center>")
html.print("<a href='/help.html#tunnels' target='_blank'>Help</a>")
html.print("&nbsp;&nbsp;&nbsp;")
html.print("<input type=submit name=button_save value='Save Changes' title='Save and use these settings now (takes about 20 seconds)'>&nbsp;")
html.print("<input type=submit name=button_reset value='Reset Values' title='Revert to the last saved settings'>&nbsp;")
html.print("<input type=button name=button_refresh value='Refresh' title='Refresh this page' onclick='window.location.reload();'>&nbsp;")
html.print("<tr><td>&nbsp;</td></tr>")
hide("<input type=hidden name=reload value=1></td></tr>")

-- unsupported tunnels
local notunnels = not nixio.fs.stat("/usr/sbin/vtund")
if notunnels then
    html.print("<tr><td align=center><span style=background-color:cyan;font-size:140%;>&nbsp; Tunnels are no longer supported on this hardware &nbsp;</span></td></tr>")
    cli_err = {}
-- low memory warning
elseif isLowMemNode() then
    html.print("<tr><td align=center><span style=background-color:cyan;font-size:140%;>&nbsp; Recommend not to use tunneling due to low memory on this node &nbsp;</span></td></tr>")
end

-- messages
if #cli_err > 0 then
    html.print("<tr><td align=center><b>ERROR:<br>")
    for _,msg in ipairs(cli_err)
    do
        html.print(msg .. "<br>")
    end
    html.print("</b></td></tr>")
end

if parms.button_save then
    if #cli_err > 0 then
        html.print("<tr><td align=center><b>Configuration NOT saved!</b></td></tr>")
        for _,msg in ipairs(errors)
        do
            html.print(msg .. "<br>")
        end
	    html.print("</b></td></tr>")
    else
        html.print("<tr><td align=center><b>Configuration saved and is now active.</b></td></tr>")
    end
    html.print("<tr><td>&nbsp;</td></tr>")
end

-- everything else
html.print("<tr><td align=center valign=top>")
-- print vpn clients
html.print("<table cellpadding=0 cellspacing=0>")

if is_new_supernode then
    html.print("<br /><tr class=tun_network_row><td colspan=6 valign=top><div style='display:inline-block;width:175px;padding-left:50px'>Wireguard Server Network:</div>")
    html.print(netwg[1] .. "." .. netwg[2] .. ".<input type='text' name='server_wgnet1' size='3' maxlen='3' value='" .. netwg[3] .. "' onChange='form.submit()' title='from 0-255' >.<input type='text' name='server_wgnet2' size='3' maxlen='3' value='" .. netwg[4] .. "' onChange='form.submit()' title='from 2-252 in multiples of 2. (ie. 2,4,6,8...252)' >")
else
    html.print("<br /><tr class=tun_network_row><td colspan=6 valign=top><div style='display:inline-block;width:175px;padding-left:50px'>Tunnel Server Network:</div>")
    html.print(netw[1] .. "." .. netw[2] .. ".<input type='text' name='server_net1' size='3' maxlen='3' value='" .. netw[3] .. "' onChange='form.submit()' title='from 0-255' >.<input type='text' name='server_net2' size='3' maxlen='3' value='" .. netw[4] .. "' onChange='form.submit()' title='from 4-252 in multiples of 4. (ie. 4,8,12,16...252)' >")
    html.print("<br /><div style='display:inline-block;width:175px;padding:2px 0 0 50px'>Wireguard Server Network:</div>")
    html.print(netwg[1] .. "." .. netwg[2] .. "." .. netwg[3] .. "." .. netwg[4])
end
html.print("<br /><hr>Tunnel Server DNS Name: ")
html.print("<input type='text' name='dns' size='30' value='" .. dns .. "' onChange='form.submit()' ></td></tr>")

html.print("</table>")
html.print("<table cellpadding=0 cellspacing=0>")
html.print("<tr><th colspan=6 align=center valign=top>&nbsp;</th></tr>")
if not is_new_supernode then
    html.print("<tr class=tun_client_row>")
    html.print("<tr><th colspan=6>Allow the following clients to connect to this server:</th></tr>")
    html.print("<tr><th colspan=6><hr></th></tr>")
    html.print("<tr><th>Enabled?</th><th>Client</th><th>Pwd</th><th>Net</th><th>Active&nbsp;</td><th>Action</th></tr>")

    -- loop
    local list = {}
    for i = 0,client_num-1
    do
        list[#list+1] = i
    end
    if client_num < 100 then
        list[#list+1] = "_add"
    end

    local keys = { "enabled", "name", "passwd", "contact" }
    local cnum = 0
    for _, val in ipairs(list)
    do
        for _, var in ipairs(keys)
        do
            _G[var] = parms["client" .. val .. "_" .. var]
        end
        html.print("<tr class='tun_client_list2 tun_client_row'>")
        html.print("<td class='tun_client_center_item' rowspan='2'>")
        html.print("<input type='checkbox' name='client" .. val .. "_enabled' value='1'")
        if val ~= "_add" then
            html.print(" onChange='form.submit()'")
        end
        if enabled == "1" then
            html.print(" checked='checked'")
        end
        html.print(" title='enable this client'></td>")
        html.print("<td><input type=text size=40 name=client" .. val .. "_name value='" .. name .. "'")
        if val ~= "_add" then
            html.print(" onChange='form.submit()'")
        end
        html.print(" title='client name'></td>")
        html.print("<td>")
        html.print("<input type=text size=25 name=client" .. val .. "_passwd value='" .. passwd .. "' title='client password' ")
        if val ~= "_add" then
            html.print(" onChange='form.submit()'")
        end
        html.print("</td>")

        -- handle rollover of netw
        local net
        if netw[4] + cnum * 4 > 252 then
            netw[3] = netw[3] + 1
            netw[4] = 0
            net = 0
            cnum = 0
        else
            net = cnum
        end
        local lastnet = netw[4] + net * 4
        local fullnet = netw[1] .. "." .. netw[2] .. "." .. netw[3] .. "." .. lastnet
        html.print("<td rowspan='2' class='tun_client_center_item'>")
        html.print("<input style='min-width:90px;background-color:transparent;color:inherit;border:0;text-align:center;' readonly type=text size=20 name=client" .. val .. "_netip value='" .. fullnet .. "'/></td>")
        html.print("<td rowspan='2' class='tun_client_center_item' align=center>&nbsp;")
        if val ~= "_add" and is_tunnel_active(fullnet, active_tun) then
            html.print("<img class='tun_client_active_img' src='/connected.png' title='Connected' />")
        else
            html.print("<img class='tun_client_inactive_img' src='/disconnected.png' title='Not connected' />")
        end
        html.print("</td>")
        if val == "_add" then
            html.print("<td rowspan='2' class='tun_client_center_item'><input type=submit name=client_add value=Add title='Add this client'></td>")
        else
            html.print("<td rowspan='2' class='tun_client_center_item tun_client_mailto' id=client" .. val .. "_email>")
            html.print("<a href='mailto:?subject=AREDN%20Tunnel%20Connection&body=Your%20connection%20details:%0D%0AName:%20" .. name .. "%0D%0APassword:%20" .. passwd .. "%0D%0ANetwork:%20" .. fullnet .. "%0D%0AServer%20address:%20" .. dns .. "' target='_blank'>")
            html.print("<img class='tun_client_mailto_img' src='/email.png' title='Email details' /></a></td>")
        end
        html.print("</tr><tr class='tun_client_list1 tun_client_row tun_loading_css_comment'><td colspan='2' align='right'>Contact Info/Comment (Optional): <input type=text maxlength='50' size=40 name=client" .. val .. "_contact value='" .. contact .."'")
        if val ~= "" and val ~= "_add" then
            html.print(" onChange='form.submit()'")
        end
        html.print(" title='client contact info'></td></tr>")

        -- display any errors
        while #cli_err > 0 and cli_err[1]:match("^" .. val .. " ")
        do
            html.print("<tr class=tun_client_error_row><th colspan=4>" .. cli_err[1]:gsub("^%S+ ", "") .. "</th></tr>")
            table.remove(cli_err)
        end

        html.print("<tr><td colspan=4 height=4></td></tr>")
        cnum = cnum + 1
    end
end

-- Wireguard
html.print("<tr><th colspan=6></th></tr>")
html.print("<tr><th colspan=6 style='padding: 30px 0 0 0'>Allow the following clients to connect to this Wireguard server:</th></tr>")
html.print("<tr><th colspan=6><hr></th></tr>")
html.print("<tr><th>Enabled?</th><th>Client</th><th>Key</th><th>Client</th><th>Active&nbsp;</td><th>Action</th></tr>")

local keys = { "enabled", "name", "contact", "key" }
local cnum = 0
local wg_port = tonumber(cursor:get("vtun", "@options[0]", "port") or 5525)
if is_supernode then
    wg_port = wg_port + 1000
end
for val = 0, wgclient_num
do
    if val == wgclient_num then
        val = "_add"
    end
    for _, var in ipairs(keys)
    do
        _G[var] = parms["wgclient" .. val .. "_" .. var]
    end
    html.print("<tr class='tun_client_list2 tun_client_row'>")
    html.print("<td class='tun_client_center_item' rowspan='2'>")
    html.print("<input type='checkbox' name='wgclient" .. val .. "_enabled' value='1'")
    if val ~= "_add" then
        html.print(" onChange='form.submit()'")
    end
    if enabled == "1" then
        html.print(" checked='checked'")
    end
    html.print(" title='enable this client'></td>")
    html.print("<td><input type=text size=40 name=wgclient" .. val .. "_name value='" .. (name or "") .. "'")
    if val ~= "_add" then
        html.print(" onChange='form.submit()'")
    end
    html.print(" title='client name'></td>")
    html.print("<td>")
    local _, server_pub, client_priv, client_pub = key:match("^(.+=)(.+=)(.+=)(.+=)$")
    local client_key = val == "_add" and "" or (server_pub .. client_priv .. client_pub)
    html.print("<input type=hidden name=wgclient" .. val .. "_key value='" .. key .. "'><input type=" .. (val == '_add' and 'hidden' or 'text') .. " readonly size=25 name=wgclient" .. val .. "_clientkey value='" .. client_key .. "' title='client key'>")
    html.print("</td>")

    local netwg4 = tonumber(netwg[4]) + 2 * cnum
    if netwg4 >= 254 then
        netwg4 = netwg4 - 252
    end
    local fullnet = netwg[1] .. "." .. netwg[2] .. "." .. netwg[3] .. "." .. netwg4 .. ":" .. (wg_port + cnum)
    html.print("<td rowspan='2' class='tun_client_center_item'>")
    html.print("<input style='min-width:90px;background-color:transparent;color:inherit;border:0;text-align:center;' readonly type=text size=20 name=wgclient" .. val .. "_clientip value='" .. fullnet .. "'/></td>")
    html.print("<td rowspan='2' class='tun_client_center_item' align=center>&nbsp;")
    if val ~= "_add" and is_wgtunnel_active(client_pub) then
        html.print("<img class='tun_client_active_img' src='/connected.png' title='Connected' />")
    else
        html.print("<img class='tun_client_inactive_img' src='/disconnected.png' title='Not connected' />")
    end
    html.print("</td>")
    if val == "_add" then
        html.print("<td rowspan='2' class='tun_client_center_item'><input type=submit name=wgclient_add value=Add title='Add this client'></td>")
    else
        html.print("<td rowspan='2' class='tun_client_center_item tun_client_mailto' id=wgclient" .. val .. "_email>")
        html.print("<a href='mailto:?subject=AREDN%20Tunnel%20Connection&body=Your%20connection%20details:%0D%0AName:%20" ..encode_uri_component(name) .. "%0D%0APassword:%20" .. encode_uri_component(server_pub .. client_priv .. client_pub) .. "%0D%0ANetwork:%20" .. encode_uri_component(fullnet) .. "%0D%0AServer%20address:%20" .. encode_uri_component(dns) .. "' target='_blank'>")
        html.print("<img class='tun_client_mailto_img' src='/email.png' title='Email details' /></a></td>")
    end
    html.print("</tr><tr class='tun_client_list1 tun_client_row tun_loading_css_comment'><td colspan='2' align='right'>Contact Info/Comment (Optional): <input type=text maxlength='50' size=40 name=wgclient" .. val .. "_contact value='" .. (contact or "") .."'")
    if val ~= "" and val ~= "_add" then
        html.print(" onChange='form.submit()'")
    end
    html.print(" title='client contact info'></td></tr>")

    -- display any errors
    while #cli_err > 0 and cli_err[1]:match("^" .. val .. " ")
    do
        html.print("<tr class=tun_client_error_row><th colspan=4>" .. cli_err[1]:gsub("^%S+ ", "") .. "</th></tr>")
        table.remove(cli_err)
    end

    html.print("<tr><td colspan=4 height=4></td></tr>")
    cnum = cnum + 1
end

html.print("</table>")
--
html.print("</td></tr><tr><td><hr></td></tr>")
html.print("</table>")
hide("<input type=hidden name=client_num value=" .. parms.client_num .. ">")
hide("<input type=hidden name=wgclient_num value=" .. parms.wgclient_num .. ">")

-- add hidden forms fields
for _, h in ipairs(hidden)
do
html.print(h)
end

-- close the form
html.print("</form></center>")
html.footer()
html.print("</body></html>")
http_footer()