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|
-- Prosody IM v0.4
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
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 full_sessions = full_sessions;
local bare_sessions = bare_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 nameprep = require "util.encodings".stringprep.nameprep;
local fire_event = require "core.eventmanager".fire_event;
local gettime = require "socket".gettime;
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", conntime = gettime() };
if true then
session.trace = newproxy(true);
getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
end
open_sessions = open_sessions + 1;
log("debug", "open sessions now: ".. open_sessions);
local w = conn.write;
session.send = function (t) w(tostring(t)); end
session.ip = conn.ip();
return session;
end
function destroy_session(session, err)
(session.log or log)("info", "Destroying session for %s (%s@%s)", session.full_jid or "(unknown)", session.username or "(unknown)", session.host or "(unknown)");
-- 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):up();
session:dispatch_stanza(pres);
end
-- Remove session/resource from user's session list
if session.host and session.username then
-- FIXME: How can the below ever be nil? (but they sometimes are...)
if hosts[session.host] and hosts[session.host].sessions[session.username] then
if session.resource then
hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
full_sessions[session.full_jid] = nil;
end
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;
bare_sessions[session.host..'@'..session.username] = nil;
end
else
log("error", "host or session table didn't exist, please report this! Host: %s [%s] Sessions: %s [%s]",
tostring(hosts[session.host]), tostring(session.host),
tostring(hosts[session.host].sessions[session.username] ), tostring(session.username));
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
session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
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
local sessions = { sessions = {} };
hosts[session.host].sessions[session.username] = sessions;
bare_sessions[session.host..'@'..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
sessions[resource]:close {
condition = "conflict";
text = "Replaced by new connection";
};
if not next(sessions) then
hosts[session.host].sessions[session.username] = { sessions = sessions };
end
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;
full_sessions[session.full_jid] = 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.host = nameprep(session.host);
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
-- If session.secure is *false* (not nil) then it means we /were/ encrypting
-- since we now have a new stream header, session is secured
if session.secure == false then
session.secure = true;
end
local features = st.stanza("stream:features");
fire_event("stream-features", session, features);
send(features);
(session.log or log)("debug", "Sent reply <stream:stream> to client");
session.notopen = nil;
end
function streamclosed(session)
session.send("</stream:stream>");
session.notopen = true;
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;
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