-- Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local tonumber, tostring, setmetatable = tonumber, tostring, setmetatable; local ipairs, pairs, print, next= ipairs, pairs, print, next; local format = import("string", "format"); local hosts = hosts; local full_sessions = full_sessions; local bare_sessions = bare_sessions; local modulemanager = require "core.modulemanager"; local logger = require "util.logger"; local log = 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 resourceprep = require "util.encodings".stringprep.resourceprep; local nodeprep = require "util.encodings".stringprep.nodeprep; local initialize_filters = require "util.filters".initialize; local fire_event = prosody.events.fire_event; local add_task = require "util.timer".add_task; local gettime = require "socket".gettime; local st = require "util.stanza"; local c2s_timeout = config_get("*", "core", "c2s_timeout"); local newproxy = newproxy; local getmetatable = getmetatable; module "sessionmanager" local open_sessions = 0; function new_session(conn) local session = { conn = conn, 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 filter = initialize_filters(session); local w = conn.write; session.send = function (t) if t.name then t = filter("stanzas/out", t); end if t then t = filter("bytes/out", tostring(t)); if t then return w(conn, t); end end end session.ip = conn:ip(); local conn_name = "c2s"..tostring(conn):match("[a-f0-9]+$"); session.log = logger.init(conn_name); if c2s_timeout then add_task(c2s_timeout, function () if session.type == "c2s_unauthed" then session:close("connection-timeout"); end end); end return session; end local resting_session = { -- Resting, not dead destroyed = true; type = "c2s_destroyed"; close = function (session) session.log("debug", "Attempt to close already-closed session"); end; filter = function (type, data) return data; end; }; resting_session.__index = resting_session; function retire_session(session) local log = session.log or log; for k in pairs(session) do if k ~= "trace" and k ~= "log" and k ~= "id" then session[k] = nil; end end function session.send(data) log("debug", "Discarding data sent to resting session: %s", tostring(data)); end function session.data(data) log("debug", "Discarding data received from resting session: %s", tostring(data)); end return setmetatable(session, resting_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)"); if session.destroyed then return; end -- Remove session/resource from user's session list if session.full_jid then hosts[session.host].sessions[session.username].sessions[session.resource] = nil; full_sessions[session.full_jid] = nil; 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.username..'@'..session.host] = nil; end hosts[session.host].events.fire_event("resource-unbind", {session=session, error=err}); end retire_session(session); end function make_authenticated(session, username) username = nodeprep(username); if not username or #username == 0 then return nil, "Invalid username"; end 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 = resourceprep(resource); resource = resource ~= "" and 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.username..'@'..session.host] = 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", "resource-constraint", "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 }; bare_sessions[session.username.."@"..session.host] = hosts[session.host].sessions[session.username]; 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; local err; session.roster, err = rm_load_roster(session.username, session.host); if err then full_sessions[session.full_jid] = nil; hosts[session.host].sessions[session.username].sessions[resource] = nil; session.full_jid = nil; session.resource = nil; if next(bare_sessions[session.username..'@'..session.host].sessions) == nil then bare_sessions[session.username..'@'..session.host] = nil; hosts[session.host].sessions[session.username] = nil; end return nil, "cancel", "internal-server-error", "Error loading roster"; end hosts[session.host].events.fire_event("resource-bind", {session=session}); return true; end function streamopened(session, attr) local send = session.send; session.host = attr.to; if not session.host then session:close{ condition = "improper-addressing", text = "A 'to' attribute is required on stream headers" }; return; end session.host = nameprep(session.host); session.version = tonumber(attr.version) or 0; session.streamid = uuid_generate(); (session.log or session)("debug", "Client sent opening <stream:stream> to %s", 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 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' xml:lang='en'>", session.streamid, session.host)); (session.log or log)("debug", "Sent reply <stream:stream> to client"); session.notopen = nil; -- 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"); hosts[session.host].events.fire_event("stream-features", { origin = session, features = features }); fire_event("stream-features", session, features); send(features); end function streamclosed(session) session.log("debug", "Received </stream:stream>"); session:close(); end function send_to_available_resources(user, host, stanza) local jid = user.."@"..host; local count = 0; local user = bare_sessions[jid]; if user then for k, session in pairs(user.sessions) do if session.presence then session.send(stanza); count = count + 1; end end end return count; end function send_to_interested_resources(user, host, stanza) local jid = user.."@"..host; local count = 0; local user = bare_sessions[jid]; if user then for k, session in pairs(user.sessions) do if session.interested then session.send(stanza); count = count + 1; end end end return count; end return _M;