view mod_tcpproxy/mod_tcpproxy.lua @ 3492:f59334da6df9

mod_conversejs: Show fallback text if converse.js fails to load (thanks MattJ) This can happen if javascript is enabled but 3rd party resources are blocked, or some other error happened.
author Kim Alvefur <zash@zash.se>
date Tue, 19 Mar 2019 19:43:13 +0100
parents db8b256f51ff
children 3804332c204e
line wrap: on
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local st = require "util.stanza";

local xmlns_ibb = "http://jabber.org/protocol/ibb";
local xmlns_tcp = "http://prosody.im/protocol/tcpproxy";

local host_attr, port_attr = xmlns_tcp.."\1host", xmlns_tcp.."\1port";

local base64 = require "util.encodings".base64;
local b64, unb64 = base64.encode, base64.decode;

local host = module.host;

local open_connections = {};

local function new_session(jid, sid, conn)
	if not open_connections[jid] then
		open_connections[jid] = {};
	end
	open_connections[jid][sid] = conn;
end
local function close_session(jid, sid)
	if open_connections[jid] then
		open_connections[jid][sid] = nil;
		if next(open_connections[jid]) == nil then
			open_connections[jid] = nil;
		end
		return true;
	end
end

function proxy_component(origin, stanza)
	local ibb_tag = stanza.tags[1];
	if (not (stanza.name == "iq" and stanza.attr.type == "set")
		and stanza.name ~= "message")
		or
		(not (ibb_tag)
		 or ibb_tag.attr.xmlns ~= xmlns_ibb) then
		if stanza.attr.type ~= "error" then
			origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
		end
		return;
	end

	if ibb_tag.name == "open" then
		-- Starting a new stream
		local to_host, to_port = ibb_tag.attr[host_attr], ibb_tag.attr[port_attr];
		local jid, sid = stanza.attr.from, ibb_tag.attr.sid;
		if not (to_host and to_port) then
			origin.send(st.error_reply(stanza, "modify", "bad-request", "No host/port specified"));
			return true;
		elseif not sid or sid == "" then
			origin.send(st.error_reply(stanza, "modify", "bad-request", "No sid specified"));
			return true;
		elseif ibb_tag.attr.stanza ~= "message" then
			origin.send(st.error_reply(stanza, "modify", "bad-request", "Only 'message' stanza transport is supported"));
			return true;
		end
		local conn, err = socket.tcp();
		if not conn then
			origin.send(st.error_reply(stanza, "wait", "resource-constraint", err));
			return true;
		end
		conn:settimeout(0);

		local success, err = conn:connect(to_host, to_port);
		if not success and err ~= "timeout" then
			origin.send(st.error_reply(stanza, "wait", "remote-server-not-found", err));
			return true;
		end

		local listener,seq = {}, 0;
		function listener.onconnect(conn)
			origin.send(st.reply(stanza));
		end
		function listener.onincoming(conn, data)
			origin.send(st.message({to=jid,from=host})
				:tag("data", {xmlns=xmlns_ibb,seq=seq,sid=sid})
				:text(b64(data)));
			seq = seq + 1;
		end
		function listener.ondisconnect(conn, err)
			origin.send(st.message({to=jid,from=host})
				:tag("close", {xmlns=xmlns_ibb,sid=sid}));
			close_session(jid, sid);
		end

		conn = server.wrapclient(conn, to_host, to_port, listener, "*a" );
		new_session(jid, sid, conn);
	elseif ibb_tag.name == "data" then
		local conn = open_connections[stanza.attr.from][ibb_tag.attr.sid];
		if conn then
			local data = unb64(ibb_tag:get_text());
			if data then
				conn:write(data);
			else
				origin.send(
					st.error_reply(stanza, "modify", "bad-request", "Invalid data (base64?)")
				);
				return true;
			end
		else
			origin.send(st.error_reply(stanza, "cancel", "item-not-found"));
			return true;
		end
	elseif ibb_tag.name == "close" then
		if close_session(stanza.attr.from, ibb_tag.attr.sid) then
			origin.send(st.reply(stanza));
		else
			origin.send(st.error_reply(stanza, "cancel", "item-not-found"));
			return true;
		end
	end
end

local function stanza_handler(event)
	proxy_component(event.origin, event.stanza);
	return true;
end
module:hook("iq/bare", stanza_handler, -1);
module:hook("message/bare", stanza_handler, -1);
module:hook("presence/bare", stanza_handler, -1);
module:hook("iq/full", stanza_handler, -1);
module:hook("message/full", stanza_handler, -1);
module:hook("presence/full", stanza_handler, -1);
module:hook("iq/host", stanza_handler, -1);
module:hook("message/host", stanza_handler, -1);
module:hook("presence/host", stanza_handler, -1);

require "core.componentmanager".register_component(host, function() end); -- COMPAT Prosody 0.7