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 tonumber, tostring, setmetatable = tonumber, tostring, setmetatable;
  10 local ipairs, pairs, print, next= ipairs, pairs, print, 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 error = error;
  19 local rm_load_roster = require "core.rostermanager".load_roster;
  20 local config_get = require "core.configmanager".get;
  21 local resourceprep = require "util.encodings".stringprep.resourceprep;
  22 local nodeprep = require "util.encodings".stringprep.nodeprep;
  23 local uuid_generate = require "util.uuid".generate;
  24
  25 local initialize_filters = require "util.filters".initialize;
  26 local fire_event = prosody.events.fire_event;
  27 local add_task = require "util.timer".add_task;
  28 local gettime = require "socket".gettime;
  29
  30 local st = require "util.stanza";
  31
  32 local newproxy = newproxy;
  33 local getmetatable = getmetatable;
  34
  35 module "sessionmanager"
  36
  37 local open_sessions = 0;
  38
  39 function new_session(conn)
  40         local session = { conn = conn, type = "c2s_unauthed", conntime = gettime() };
  41         if true then
  42                 session.trace = newproxy(true);
  43                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
  44         end
  45         open_sessions = open_sessions + 1;
  46         log("debug", "open sessions now: ".. open_sessions);
  47
  48         local filter = initialize_filters(session);
  49         local w = conn.write;
  50         session.send = function (t)
  51                 if t.name then
  52                         t = filter("stanzas/out", t);
  53                 end
  54                 if t then
  55                         t = filter("bytes/out", tostring(t));
  56                         if t then
  57                                 return w(conn, t);
  58                         end
  59                 end
  60         end
  61         session.ip = conn:ip();
  62         local conn_name = "c2s"..tostring(conn):match("[a-f0-9]+$");
  63         session.log = logger.init(conn_name);
  64
  65         return session;
  66 end
  67
  68 local resting_session = { -- Resting, not dead
  69                 destroyed = true;
  70                 type = "c2s_destroyed";
  71                 close = function (session)
  72                         session.log("debug", "Attempt to close already-closed session");
  73                 end;
  74                 filter = function (type, data) return data; end;
  75         }; resting_session.__index = resting_session;
  76
  77 function retire_session(session)
  78         local log = session.log or log;
  79         for k in pairs(session) do
  80                 if k ~= "trace" and k ~= "log" and k ~= "id" then
  81                         session[k] = nil;
  82                 end
  83         end
  84
  85         function session.send(data) log("debug", "Discarding data sent to resting session: %s", tostring(data)); end
  86         function session.data(data) log("debug", "Discarding data received from resting session: %s", tostring(data)); end
  87         return setmetatable(session, resting_session);
  88 end
  89
  90 function destroy_session(session, err)
  91         (session.log or log)("info", "Destroying session for %s (%s@%s)%s", session.full_jid or "(unknown)", session.username or "(unknown)", session.host or "(unknown)", err and (": "..err) or "");
  92         if session.destroyed then return; end
  93
  94         -- Remove session/resource from user's session list
  95         if session.full_jid then
  96                 local host_session = hosts[session.host];
  97
  98                 -- Allow plugins to prevent session destruction
  99                 if host_session.events.fire_event("pre-resource-unbind", {session=session, error=err}) then
 100                         return;
 101                 end
 102
 103                 host_session.sessions[session.username].sessions[session.resource] = nil;
 104                 full_sessions[session.full_jid] = nil;
 105
 106                 if not next(host_session.sessions[session.username].sessions) then
 107                         log("debug", "All resources of %s are now offline", session.username);
 108                         host_session.sessions[session.username] = nil;
 109                         bare_sessions[session.username..'@'..session.host] = nil;
 110                 end
 111
 112                 host_session.events.fire_event("resource-unbind", {session=session, error=err});
 113         end
 114
 115         retire_session(session);
 116 end
 117
 118 function make_authenticated(session, username)
 119         username = nodeprep(username);
 120         if not username or #username == 0 then return nil, "Invalid username"; end
 121         session.username = username;
 122         if session.type == "c2s_unauthed" then
 123                 session.type = "c2s";
 124         end
 125         session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
 126         return true;
 127 end
 128
 129 -- returns true, nil on success
 130 -- returns nil, err_type, err, err_message on failure
 131 function bind_resource(session, resource)
 132         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
 133         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
 134         -- We don't support binding multiple resources
 135
 136         resource = resourceprep(resource);
 137         resource = resource ~= "" and resource or uuid_generate();
 138         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 139
 140         if not hosts[session.host].sessions[session.username] then
 141                 local sessions = { sessions = {} };
 142                 hosts[session.host].sessions[session.username] = sessions;
 143                 bare_sessions[session.username..'@'..session.host] = sessions;
 144         else
 145                 local sessions = hosts[session.host].sessions[session.username].sessions;
 146                 local limit = config_get(session.host, "core", "max_resources") or 10;
 147                 if #sessions >= limit then
 148                         return nil, "cancel", "resource-constraint", "Resource limit reached; only "..limit.." resources allowed";
 149                 end
 150                 if sessions[resource] then
 151                         -- Resource conflict
 152                         local policy = config_get(session.host, "core", "conflict_resolve");
 153                         local increment;
 154                         if policy == "random" then
 155                                 resource = uuid_generate();
 156                                 increment = true;
 157                         elseif policy == "increment" then
 158                                 increment = true; -- TODO ping old resource
 159                         elseif policy == "kick_new" then
 160                                 return nil, "cancel", "conflict", "Resource already exists";
 161                         else -- if policy == "kick_old" then
 162                                 sessions[resource]:close {
 163                                         condition = "conflict";
 164                                         text = "Replaced by new connection";
 165                                 };
 166                                 if not next(sessions) then
 167                                         hosts[session.host].sessions[session.username] = { sessions = sessions };
 168                                         bare_sessions[session.username.."@"..session.host] = hosts[session.host].sessions[session.username];
 169                                 end
 170                         end
 171                         if increment and sessions[resource] then
 172                                 local count = 1;
 173                                 while sessions[resource.."#"..count] do
 174                                         count = count + 1;
 175                                 end
 176                                 resource = resource.."#"..count;
 177                         end
 178                 end
 179         end
 180
 181         session.resource = resource;
 182         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 183         hosts[session.host].sessions[session.username].sessions[resource] = session;
 184         full_sessions[session.full_jid] = session;
 185
 186         local err;
 187         session.roster, err = rm_load_roster(session.username, session.host);
 188         if err then
 189                 full_sessions[session.full_jid] = nil;
 190                 hosts[session.host].sessions[session.username].sessions[resource] = nil;
 191                 session.full_jid = nil;
 192                 session.resource = nil;
 193                 if next(bare_sessions[session.username..'@'..session.host].sessions) == nil then
 194                         bare_sessions[session.username..'@'..session.host] = nil;
 195                         hosts[session.host].sessions[session.username] = nil;
 196                 end
 197                 return nil, "cancel", "internal-server-error", "Error loading roster";
 198         end
 199
 200         hosts[session.host].events.fire_event("resource-bind", {session=session});
 201
 202         return true;
 203 end
 204
 205 function send_to_available_resources(user, host, stanza)
 206         local jid = user.."@"..host;
 207         local count = 0;
 208         local user = bare_sessions[jid];
 209         if user then
 210                 for k, session in pairs(user.sessions) do
 211                         if session.presence then
 212                                 session.send(stanza);
 213                                 count = count + 1;
 214                         end
 215                 end
 216         end
 217         return count;
 218 end
 219
 220 function send_to_interested_resources(user, host, stanza)
 221         local jid = user.."@"..host;
 222         local count = 0;
 223         local user = bare_sessions[jid];
 224         if user then
 225                 for k, session in pairs(user.sessions) do
 226                         if session.interested then
 227                                 session.send(stanza);
 228                                 count = count + 1;
 229                         end
 230                 end
 231         end
 232         return count;
 233 end
 234
 235 return _M;