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