view mod_s2soutinjection/mod_s2soutinjection.lua @ 5296:0f5657db1cfc

mod_isolate_host: handle server-generated stanzas The hook for setting the no_host_isolation is only called for c2s sessions. This does not work for stanzas generated by the server, such as PEP notifications or presence probe answers. To handle that, we do per-stanza checks for the case that the origin is local.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 01 Apr 2023 12:03:08 +0200
parents 4fb922aa0ace
children
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local st = require"util.stanza";
local new_outgoing = require"core.s2smanager".new_outgoing;
local bounce_sendq = module:depends"s2s".route_to_new_session.bounce_sendq;
local initialize_filters = require "util.filters".initialize;

local portmanager = require "core.portmanager";

local addclient = require "net.server".addclient;

module:depends("s2s");

local sessions = module:shared("sessions");

local injected = module:get_option("s2s_connect_overrides");

-- The proxy_listener handles connection while still connecting to the proxy,
-- then it hands them over to the normal listener (in mod_s2s)
local proxy_listener = { default_port = nil, default_mode = "*a", default_interface = "*" };

function proxy_listener.onconnect(conn)
	local session = sessions[conn];

	-- Now the real s2s listener can take over the connection.
	local listener = portmanager.get_service("s2s").listener;

	local log = session.log;

	local filter = initialize_filters(session);

	session.version = 1;

	session.sends2s = function (t)
		log("debug", "sending (s2s over proxy): %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
		if t.name then
			t = filter("stanzas/out", t);
		end
		if t then
			t = filter("bytes/out", tostring(t));
			if t then
				return conn:write(tostring(t));
			end
		end
	end

	session.open_stream = function ()
		session.sends2s(st.stanza("stream:stream", {
			xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
			["xmlns:stream"]='http://etherx.jabber.org/streams',
			from=session.from_host, to=session.to_host, version='1.0', ["xml:lang"]='en'}):top_tag());
	end

	conn.setlistener(conn, listener);

	listener.register_outgoing(conn, session);

	listener.onconnect(conn);
end

function proxy_listener.register_outgoing(conn, session)
	session.direction = "outgoing";
	sessions[conn] = session;
end

function proxy_listener.ondisconnect(conn, err)
	sessions[conn]  = nil;
end

module:hook("route/remote", function(event)
	local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza;
	local inject = injected and injected[to_host];
	if not inject then return end
	module:log("debug", "opening a new outgoing connection for this stanza");
	local host_session = new_outgoing(from_host, to_host);

	-- Store in buffer
	host_session.bounce_sendq = bounce_sendq;
	host_session.sendq = { {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} };
	host_session.log("debug", "stanza [%s] queued until connection complete", tostring(stanza.name));

	local host, port = inject[1] or inject, tonumber(inject[2]) or 5269;

	local conn = addclient(host, port, proxy_listener, "*a");

	proxy_listener.register_outgoing(conn, host_session);

	host_session.conn = conn;
	return true;
end, -2);