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|
-- Prosody IM v0.1
-- Copyright (C) 2008 Matthew Wild
-- Copyright (C) 2008 Waqas Hussain
--
-- 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 2
-- 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, write to the Free Software
-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
--
local tonumber, tostring = tonumber, tostring;
local ipairs, pairs, print, next= ipairs, pairs, print, next;
local collectgarbage = collectgarbage;
local m_random = import("math", "random");
local format = import("string", "format");
local hosts = hosts;
local sessions = sessions;
local modulemanager = require "core.modulemanager";
local log = require "util.logger".init("sessionmanager");
local error = error;
local uuid_generate = require "util.uuid".generate;
local rm_load_roster = require "core.rostermanager".load_roster;
local config_get = require "core.configmanager".get;
local st = require "util.stanza";
local newproxy = newproxy;
local getmetatable = getmetatable;
module "sessionmanager"
local open_sessions = 0;
function new_session(conn)
local session = { conn = conn, priority = 0, type = "c2s_unauthed" };
if true then
session.trace = newproxy(true);
getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; print("Session got collected, now "..open_sessions.." sessions are allocated") end;
end
open_sessions = open_sessions + 1;
log("info", "open sessions now: ".. open_sessions);
local w = conn.write;
session.send = function (t) w(tostring(t)); end
return session;
end
function destroy_session(session, err)
(session.log or log)("info", "Destroying session");
-- Send unavailable presence
if session.presence then
local pres = st.presence{ type = "unavailable" };
if (not err) or err == "closed" then err = "connection closed"; end
pres:tag("status"):text("Disconnected: "..err);
session.stanza_dispatch(pres);
end
-- Remove session/resource from user's session list
if session.host and session.username then
if session.resource then
hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
end
if hosts[session.host] and hosts[session.host].sessions[session.username] then
if not next(hosts[session.host].sessions[session.username].sessions) then
log("debug", "All resources of %s are now offline", session.username);
hosts[session.host].sessions[session.username] = nil;
end
end
end
for k in pairs(session) do
if k ~= "trace" then
session[k] = nil;
end
end
end
function make_authenticated(session, username)
session.username = username;
if session.type == "c2s_unauthed" then
session.type = "c2s";
end
return true;
end
-- returns true, nil on success
-- returns nil, err_type, err, err_message on failure
function bind_resource(session, resource)
if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
-- We don't support binding multiple resources
resource = resource or uuid_generate();
--FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
if not hosts[session.host].sessions[session.username] then
hosts[session.host].sessions[session.username] = { sessions = {} };
else
local sessions = hosts[session.host].sessions[session.username].sessions;
local limit = config_get(session.host, "core", "max_resources") or 10;
if #sessions >= limit then
return nil, "cancel", "conflict", "Resource limit reached; only "..limit.." resources allowed";
end
if sessions[resource] then
-- Resource conflict
local policy = config_get(session.host, "core", "conflict_resolve");
local increment;
if policy == "random" then
resource = uuid_generate();
increment = true;
elseif policy == "increment" then
increment = true; -- TODO ping old resource
elseif policy == "kick_new" then
return nil, "cancel", "conflict", "Resource already exists";
else -- if policy == "kick_old" then
hosts[session.host].sessions[session.username].sessions[resource]:close {
condition = "conflict";
text = "Replaced by new connection";
};
end
if increment and sessions[resource] then
local count = 1;
while sessions[resource.."#"..count] do
count = count + 1;
end
resource = resource.."#"..count;
end
end
end
session.resource = resource;
session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
hosts[session.host].sessions[session.username].sessions[resource] = session;
session.roster = rm_load_roster(session.username, session.host);
return true;
end
function streamopened(session, attr)
local send = session.send;
session.host = attr.to or error("Client failed to specify destination hostname");
session.version = tonumber(attr.version) or 0;
session.streamid = m_random(1000000, 99999999);
(session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
send("<?xml version='1.0'?>");
send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' version='1.0'>", session.streamid, session.host));
if not hosts[session.host] then
-- We don't serve this host...
session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
return;
end
local features = st.stanza("stream:features");
modulemanager.fire_event("stream-features", session, features);
send(features);
(session.log or log)("info", "Sent reply <stream:stream> to client");
session.notopen = nil;
end
function send_to_available_resources(user, host, stanza)
local count = 0;
local to = stanza.attr.to;
stanza.attr.to = nil;
local h = hosts[host];
if h and h.type == "local" then
local u = h.sessions[user];
if u then
for k, session in pairs(u.sessions) do
if session.presence then
session.send(stanza);
count = count + 1;
end
end
end
end
stanza.attr.to = to;
return count;
end
return _M;
|
