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#!/usr/bin/lua
--[[
Copyright (C) 2016 Tobias Ilte <tobias.ilte@campus.tu-berlin.de>
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, either version 3 of the License, or
(at your option) any later version.
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/>.
--]]
require "uci"
require "ubus"
require "uloop"
log = require "nixio"
--open sys-logging
log.openlog("DynaPoint", "ndelay", "cons", "nowait");
local uci_cursor = uci.cursor()
-- get all config sections with the given type
function getConfType(conf_file,type)
local ifce={}
uci_cursor:foreach(conf_file,type,function(s) ifce[s[".index"]]=s end)
return ifce
end
ubus = ubus.connect()
if not ubus then
error("Failed to connect to ubusd")
end
ubus:call("network", "reload", {})
local interval = uci_cursor:get("dynapoint", "internet", "interval")
local timeout = uci_cursor:get("dynapoint", "internet", "timeout")
local offline_threshold = tonumber(uci_cursor:get("dynapoint", "internet", "offline_threshold"))
local hosts = uci_cursor:get("dynapoint", "internet", "hosts")
local numhosts = #hosts
local curl = tonumber(uci_cursor:get("dynapoint", "internet", "use_curl"))
if (curl == 1) then
curl_interface = uci_cursor:get("dynapoint", "internet", "curl_interface")
end
function get_system_sections(t)
for pos,val in pairs(t) do
if (type(val)=="table") then
get_system_sections(val);
elseif (type(val)=="string") then
if (pos == "hostname") then
localhostname = val
end
end
end
end
if (tonumber(uci_cursor:get("dynapoint", "internet", "add_hostname_to_ssid")) == 1 ) then
get_system_sections(getConfType("system","system"))
if (not localhostname) then
error("Failed to obtain system hostname")
end
end
local table_names_rule = {}
local table_names_not_rule = {}
local ssids_with_hostname = {}
local ssids_not_rule = {}
function get_dynapoint_sections(t)
for pos,val in pairs(t) do
if (type(val)=="table") then
get_dynapoint_sections(val);
elseif (type(val)=="string") then
if (pos == "dynapoint_rule") then
if (val == "internet") then
table_names_rule[#table_names_rule+1] = t[".name"]
elseif (val == "!internet") then
table_names_not_rule[#table_names_not_rule+1] = t[".name"]
if (localhostname) then
ssids_not_rule[#ssids_not_rule+1] = uci_cursor:get("wireless", t[".name"], "ssid")
ssids_with_hostname[#ssids_with_hostname+1] = uci_cursor:get("wireless", t[".name"], "ssid").."_"..localhostname
end
end
end
end
end
end
--print(table.getn(hosts))
get_dynapoint_sections(getConfType("wireless","wifi-iface"))
-- revert all non-persistent ssid uci-changes regarding sections affecting dynapoint
for i = 1, #table_names_not_rule do
uci_cursor:revert("wireless", table_names_not_rule[i], "ssid")
end
local online = true
if (#table_names_rule > 0) then
if (tonumber(uci_cursor:get("wireless", table_names_rule[1], "disabled")) == 1) then
online = false
end
else
log.syslog("info","Not properly configured. Please add <option dynapoint_rule 'internet'> to /etc/config/wireless")
end
local timer
local offline_counter = 0
uloop.init()
function do_internet_check(host)
if (curl == 1 ) then
if (curl_interface) then
result = os.execute("curl -s -m "..timeout.." --max-redirs 0 --interface "..curl_interface.." --head "..host.." > /dev/null")
else
result = os.execute("curl -s -m "..timeout.." --max-redirs 0 --head "..host.." > /dev/null")
end
else
result = os.execute("wget -q --timeout="..timeout.." --spider "..host)
end
if (result == 0) then
return true
else
return false
end
end
function change_wireless_config(switch_to_offline)
if (switch_to_offline == 1) then
log.syslog("info","Switched to OFFLINE")
for i = 1, #table_names_not_rule do
uci_cursor:set("wireless",table_names_not_rule[i], "disabled", "0")
if (localhostname) then
uci_cursor:set("wireless", table_names_not_rule[i], "ssid", ssids_with_hostname[i])
end
log.syslog("info","Bring up new AP "..uci_cursor:get("wireless", table_names_not_rule[i], "ssid"))
end
for i = 1, #table_names_rule do
uci_cursor:set("wireless",table_names_rule[i], "disabled", "1")
end
else
log.syslog("info","Switched to ONLINE")
for i = 1, #table_names_not_rule do
uci_cursor:set("wireless",table_names_not_rule[i], "disabled", "1")
if (localhostname) then
uci_cursor:set("wireless", table_names_not_rule[i], "ssid", ssids_not_rule[i])
end
end
for i = 1, #table_names_rule do
uci_cursor:set("wireless",table_names_rule[i], "disabled", "0")
log.syslog("info","Bring up new AP "..uci_cursor:get("wireless", table_names_rule[i], "ssid"))
end
end
uci_cursor:save("wireless")
ubus:call("network", "reload", {})
end
local hostindex = 1
function check_internet_connection()
print("checking "..hosts[hostindex].."...")
if (do_internet_check(hosts[hostindex]) == true) then
-- online
print("...seems to be online")
offline_counter = 0
hostindex = 1
if (online == false) then
print("changed state to online")
online = true
change_wireless_config(0)
end
else
--offline
print("...seems to be offline")
hostindex = hostindex + 1
if (hostindex <= numhosts) then
check_internet_connection()
else
hostindex = 1
-- and activate offline-mode
print("all hosts offline")
if (online == true) then
offline_counter = offline_counter + 1
if (offline_counter == offline_threshold) then
print("changed state to offline")
online = false
change_wireless_config(1)
end
end
end
end
timer:set(interval * 1000)
end
timer = uloop.timer(check_internet_connection)
timer:set(interval * 1000)
uloop.run()
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