net.server_epoll: Add support for systemd socket activation
Allows creating listening sockets and accepting client connections
before Prosody starts.
This is unlike normal Prosody dynamic resource management, where ports
may added and removed at any time, and the ports defined by the config.
Weird things happen if these are closed (e.g. due to reload) so here we
prevent closing and ensure sockets are reused when opened again.
-- Prosody IM
-- Copyright (C) 2008-2017 Matthew Wild
-- Copyright (C) 2008-2017 Waqas Hussain
-- Copyright (C) 2008-2017 Kim Alvefur
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local s_gsub = string.gsub;
local random_bytes = require "prosody.util.random".bytes;
local base64_encode = require "prosody.util.encodings".base64.encode;
local b64url = { ["+"] = "-", ["/"] = "_", ["="] = "" };
local function b64url_random(len)
return (s_gsub(base64_encode(random_bytes(len)), "[+/=]", b64url));
end
return {
-- sizes divisible by 3 fit nicely into base64 without padding==
-- for short lived things with low risk of collisions
tiny = function() return b64url_random(3); end;
-- close to 8 bytes, should be good enough for relatively short lived or uses
-- scoped by host or users, half the size of an uuid
short = function() return b64url_random(9); end;
-- more entropy than uuid at 2/3 the size
-- should be okay for globally scoped ids or security token
medium = function() return b64url_random(18); end;
-- as long as an uuid but MOAR entropy
long = function() return b64url_random(27); end;
-- pick your own adventure
custom = function (size)
return function () return b64url_random(size); end;
end;
}