annotate mod_s2s_idle_timeout/mod_s2s_idle_timeout.lua @ 2103:11f047bcb9e4

mod_firewall: README: Add note about user-defined chains
author Matthew Wild <mwild1@gmail.com>
date Thu, 17 Mar 2016 11:24:20 +0000
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1 local now = os.time;
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3 local s2smanager = require "core.s2smanager";
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4 local timer = require "util.timer";
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6 local s2s_sessions = setmetatable({}, { __mode = "kv" });
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8 local idle_timeout = module:get_option("s2s_idle_timeout") or 300;
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9 local check_interval = math.ceil(idle_timeout * 0.75);
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11 local function install_checks(session)
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12 if not session.last_received_time then
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13 session.last_received_time = now();
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14 if session.direction == "incoming" then
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15 local _data = session.data;
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16 function session.data(conn, data)
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17 session.last_received_time = now();
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18 return _data(conn, data);
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19 end
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20 else
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21 local _sends2s = session.sends2s;
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22 function session.sends2s(data)
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23 session.last_received_time = now();
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24 return _sends2s(data);
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25 end
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26 end
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27 s2s_sessions[session] = true;
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28 end
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29 end
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30
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31 module:hook("s2s-authenticated", function (event)
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32 install_checks(event.session);
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33 end);
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35 function check_idle_sessions(time)
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36 time = time or now();
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37 for session in pairs(s2s_sessions) do
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38 local last_received_time = session.last_received_time;
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39 if last_received_time and time - last_received_time > idle_timeout then
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40 module:log("debug", "Closing idle connection %s->%s",
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41 session.from_host or "(unknown)", session.to_host or "(unknown)");
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42 session:close(); -- Close-on-idle isn't an error
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43 s2s_sessions[session] = nil;
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44 end
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45 end
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46 return check_interval;
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47 end
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48 timer.add_task(check_interval, check_idle_sessions);
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50 function module.save()
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51 return { s2s_sessions = s2s_sessions };
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52 end
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54 function module.restore(data)
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55 s2s_sessions = setmetatable(data.s2s_sessions or {}, { __mode = "kv" });
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56 end