core/sessionmanager.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9 local tostring, setmetatable = tostring, setmetatable;
  10 local pairs, next= pairs, next;
  11
  12 local hosts = hosts;
  13 local full_sessions = full_sessions;
  14 local bare_sessions = bare_sessions;
  15
  16 local logger = require "util.logger";
  17 local log = logger.init("sessionmanager");
  18 local rm_load_roster = require "core.rostermanager".load_roster;
  19 local config_get = require "core.configmanager".get;
  20 local resourceprep = require "util.encodings".stringprep.resourceprep;
  21 local nodeprep = require "util.encodings".stringprep.nodeprep;
  22 local uuid_generate = require "util.uuid".generate;
  23
  24 local initialize_filters = require "util.filters".initialize;
  25 local gettime = require "socket".gettime;
  26
  27 module "sessionmanager"
  28
  29 function new_session(conn)
  30         local session = { conn = conn, type = "c2s_unauthed", conntime = gettime() };
  31         local filter = initialize_filters(session);
  32         local w = conn.write;
  33         session.send = function (t)
  34                 if t.name then
  35                         t = filter("stanzas/out", t);
  36                 end
  37                 if t then
  38                         t = filter("bytes/out", tostring(t));
  39                         if t then
  40                                 return w(conn, t);
  41                         end
  42                 end
  43         end
  44         session.ip = conn:ip();
  45         local conn_name = "c2s"..tostring(session):match("[a-f0-9]+$");
  46         session.log = logger.init(conn_name);
  47
  48         return session;
  49 end
  50
  51 local resting_session = { -- Resting, not dead
  52                 destroyed = true;
  53                 type = "c2s_destroyed";
  54                 close = function (session)
  55                         session.log("debug", "Attempt to close already-closed session");
  56                 end;
  57                 filter = function (type, data) return data; end;
  58         }; resting_session.__index = resting_session;
  59
  60 function retire_session(session)
  61         local log = session.log or log;
  62         for k in pairs(session) do
  63                 if k ~= "log" and k ~= "id" then
  64                         session[k] = nil;
  65                 end
  66         end
  67
  68         function session.send(data) log("debug", "Discarding data sent to resting session: %s", tostring(data)); return false; end
  69         function session.data(data) log("debug", "Discarding data received from resting session: %s", tostring(data)); end
  70         return setmetatable(session, resting_session);
  71 end
  72
  73 function destroy_session(session, err)
  74         (session.log or log)("debug", "Destroying session for %s (%s@%s)%s", session.full_jid or "(unknown)", session.username or "(unknown)", session.host or "(unknown)", err and (": "..err) or "");
  75         if session.destroyed then return; end
  76
  77         -- Remove session/resource from user's session list
  78         if session.full_jid then
  79                 local host_session = hosts[session.host];
  80
  81                 -- Allow plugins to prevent session destruction
  82                 if host_session.events.fire_event("pre-resource-unbind", {session=session, error=err}) then
  83                         return;
  84                 end
  85
  86                 host_session.sessions[session.username].sessions[session.resource] = nil;
  87                 full_sessions[session.full_jid] = nil;
  88
  89                 if not next(host_session.sessions[session.username].sessions) then
  90                         log("debug", "All resources of %s are now offline", session.username);
  91                         host_session.sessions[session.username] = nil;
  92                         bare_sessions[session.username..'@'..session.host] = nil;
  93                 end
  94
  95                 host_session.events.fire_event("resource-unbind", {session=session, error=err});
  96         end
  97
  98         retire_session(session);
  99 end
 100
 101 function make_authenticated(session, username)
 102         username = nodeprep(username);
 103         if not username or #username == 0 then return nil, "Invalid username"; end
 104         session.username = username;
 105         if session.type == "c2s_unauthed" then
 106                 session.type = "c2s";
 107         end
 108         session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
 109         return true;
 110 end
 111
 112 -- returns true, nil on success
 113 -- returns nil, err_type, err, err_message on failure
 114 function bind_resource(session, resource)
 115         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
 116         if session.resource then return nil, "cancel", "not-allowed", "Cannot bind multiple resources on a single connection"; end
 117         -- We don't support binding multiple resources
 118
 119         resource = resourceprep(resource);
 120         resource = resource ~= "" and resource or uuid_generate();
 121         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 122
 123         if not hosts[session.host].sessions[session.username] then
 124                 local sessions = { sessions = {} };
 125                 hosts[session.host].sessions[session.username] = sessions;
 126                 bare_sessions[session.username..'@'..session.host] = sessions;
 127         else
 128                 local sessions = hosts[session.host].sessions[session.username].sessions;
 129                 if sessions[resource] then
 130                         -- Resource conflict
 131                         local policy = config_get(session.host, "conflict_resolve");
 132                         local increment;
 133                         if policy == "random" then
 134                                 resource = uuid_generate();
 135                                 increment = true;
 136                         elseif policy == "increment" then
 137                                 increment = true; -- TODO ping old resource
 138                         elseif policy == "kick_new" then
 139                                 return nil, "cancel", "conflict", "Resource already exists";
 140                         else -- if policy == "kick_old" then
 141                                 sessions[resource]:close {
 142                                         condition = "conflict";
 143                                         text = "Replaced by new connection";
 144                                 };
 145                                 if not next(sessions) then
 146                                         hosts[session.host].sessions[session.username] = { sessions = sessions };
 147                                         bare_sessions[session.username.."@"..session.host] = hosts[session.host].sessions[session.username];
 148                                 end
 149                         end
 150                         if increment and sessions[resource] then
 151                                 local count = 1;
 152                                 while sessions[resource.."#"..count] do
 153                                         count = count + 1;
 154                                 end
 155                                 resource = resource.."#"..count;
 156                         end
 157                 end
 158         end
 159
 160         session.resource = resource;
 161         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 162         hosts[session.host].sessions[session.username].sessions[resource] = session;
 163         full_sessions[session.full_jid] = session;
 164
 165         local err;
 166         session.roster, err = rm_load_roster(session.username, session.host);
 167         if err then
 168                 full_sessions[session.full_jid] = nil;
 169                 hosts[session.host].sessions[session.username].sessions[resource] = nil;
 170                 session.full_jid = nil;
 171                 session.resource = nil;
 172                 if next(bare_sessions[session.username..'@'..session.host].sessions) == nil then
 173                         bare_sessions[session.username..'@'..session.host] = nil;
 174                         hosts[session.host].sessions[session.username] = nil;
 175                 end
 176                 session.log("error", "Roster loading failed: %s", err);
 177                 return nil, "cancel", "internal-server-error", "Error loading roster";
 178         end
 179
 180         hosts[session.host].events.fire_event("resource-bind", {session=session});
 181
 182         return true;
 183 end
 184
 185 function send_to_available_resources(user, host, stanza)
 186         local jid = user.."@"..host;
 187         local count = 0;
 188         local user = bare_sessions[jid];
 189         if user then
 190                 for k, session in pairs(user.sessions) do
 191                         if session.presence then
 192                                 session.send(stanza);
 193                                 count = count + 1;
 194                         end
 195                 end
 196         end
 197         return count;
 198 end
 199
 200 function send_to_interested_resources(user, host, stanza)
 201         local jid = user.."@"..host;
 202         local count = 0;
 203         local user = bare_sessions[jid];
 204         if user then
 205                 for k, session in pairs(user.sessions) do
 206                         if session.interested then
 207                                 session.send(stanza);
 208                                 count = count + 1;
 209                         end
 210                 end
 211         end
 212         return count;
 213 end
 214
 215 return _M;