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