core/sessionmanager.lua

   1 -- Prosody IM v0.1
   2 -- Copyright (C) 2008 Matthew Wild
   3 -- Copyright (C) 2008 Waqas Hussain
   4 --
   5 -- This program is free software; you can redistribute it and/or
   6 -- modify it under the terms of the GNU General Public License
   7 -- as published by the Free Software Foundation; either version 2
   8 -- of the License, or (at your option) any later version.
   9 --
  10 -- This program is distributed in the hope that it will be useful,
  11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 -- GNU General Public License for more details.
  14 --
  15 -- You should have received a copy of the GNU General Public License
  16 -- along with this program; if not, write to the Free Software
  17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18 --
  19
  20
  21
  22 local tonumber, tostring = tonumber, tostring;
  23 local ipairs, pairs, print, next= ipairs, pairs, print, next;
  24 local collectgarbage = collectgarbage;
  25 local m_random = import("math", "random");
  26 local format = import("string", "format");
  27
  28 local hosts = hosts;
  29 local sessions = sessions;
  30
  31 local modulemanager = require "core.modulemanager";
  32 local log = require "util.logger".init("sessionmanager");
  33 local error = error;
  34 local uuid_generate = require "util.uuid".generate;
  35 local rm_load_roster = require "core.rostermanager".load_roster;
  36 local config_get = require "core.configmanager".get;
  37
  38 local st = require "util.stanza";
  39
  40 local newproxy = newproxy;
  41 local getmetatable = getmetatable;
  42
  43 module "sessionmanager"
  44
  45 local open_sessions = 0;
  46
  47 function new_session(conn)
  48         local session = { conn = conn,  priority = 0, type = "c2s_unauthed" };
  49         if true then
  50                 session.trace = newproxy(true);
  51                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; print("Session got collected, now "..open_sessions.." sessions are allocated") end;
  52         end
  53         open_sessions = open_sessions + 1;
  54         log("info", "open sessions now: ".. open_sessions);
  55         local w = conn.write;
  56         session.send = function (t) w(tostring(t)); end
  57         return session;
  58 end
  59
  60 function destroy_session(session, err)
  61         (session.log or log)("info", "Destroying session");
  62
  63         -- Send unavailable presence
  64         if session.presence then
  65                 local pres = st.presence{ type = "unavailable" };
  66                 if (not err) or err == "closed" then err = "connection closed"; end
  67                 pres:tag("status"):text("Disconnected: "..err);
  68                 session.stanza_dispatch(pres);
  69         end
  70
  71         -- Remove session/resource from user's session list
  72         if session.host and session.username then
  73                 -- FIXME: How can the below ever be nil? (but they sometimes are...)
  74                 if hosts[session.host] and hosts[session.host].sessions[session.username] then
  75                         if session.resource then
  76                                 hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
  77                         end
  78
  79                         if not next(hosts[session.host].sessions[session.username].sessions) then
  80                                 log("debug", "All resources of %s are now offline", session.username);
  81                                 hosts[session.host].sessions[session.username] = nil;
  82                         end
  83                 else
  84                         log("error", "host or session table didn't exist, please report this! Host: %s [%s] Sessions: %s [%s]",
  85                                         tostring(hosts[session.host]), tostring(session.host),
  86                                         tostring(hosts[session.host].sessions[session.username] ), tostring(session.username));
  87                 end
  88         end
  89
  90         for k in pairs(session) do
  91                 if k ~= "trace" then
  92                         session[k] = nil;
  93                 end
  94         end
  95 end
  96
  97 function make_authenticated(session, username)
  98         session.username = username;
  99         if session.type == "c2s_unauthed" then
 100                 session.type = "c2s";
 101         end
 102         return true;
 103 end
 104
 105 -- returns true, nil on success
 106 -- returns nil, err_type, err, err_message on failure
 107 function bind_resource(session, resource)
 108         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
 109         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
 110         -- We don't support binding multiple resources
 111
 112         resource = resource or uuid_generate();
 113         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 114
 115         if not hosts[session.host].sessions[session.username] then
 116                 hosts[session.host].sessions[session.username] = { sessions = {} };
 117         else
 118                 local sessions = hosts[session.host].sessions[session.username].sessions;
 119                 local limit = config_get(session.host, "core", "max_resources") or 10;
 120                 if #sessions >= limit then
 121                         return nil, "cancel", "conflict", "Resource limit reached; only "..limit.." resources allowed";
 122                 end
 123                 if sessions[resource] then
 124                         -- Resource conflict
 125                         local policy = config_get(session.host, "core", "conflict_resolve");
 126                         local increment;
 127                         if policy == "random" then
 128                                 resource = uuid_generate();
 129                                 increment = true;
 130                         elseif policy == "increment" then
 131                                 increment = true; -- TODO ping old resource
 132                         elseif policy == "kick_new" then
 133                                 return nil, "cancel", "conflict", "Resource already exists";
 134                         else -- if policy == "kick_old" then
 135                                 hosts[session.host].sessions[session.username].sessions[resource]:close {
 136                                         condition = "conflict";
 137                                         text = "Replaced by new connection";
 138                                 };
 139                         end
 140                         if increment and sessions[resource] then
 141                                 local count = 1;
 142                                 while sessions[resource.."#"..count] do
 143                                         count = count + 1;
 144                                 end
 145                                 resource = resource.."#"..count;
 146                         end
 147                 end
 148         end
 149
 150         session.resource = resource;
 151         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 152         hosts[session.host].sessions[session.username].sessions[resource] = session;
 153
 154         session.roster = rm_load_roster(session.username, session.host);
 155
 156         return true;
 157 end
 158
 159 function streamopened(session, attr)
 160                                                 local send = session.send;
 161                                                 session.host = attr.to or error("Client failed to specify destination hostname");
 162                                                 session.version = tonumber(attr.version) or 0;
 163                                                 session.streamid = m_random(1000000, 99999999);
 164                                                 (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
 165
 166
 167                                                 send("<?xml version='1.0'?>");
 168                                                 send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' version='1.0'>", session.streamid, session.host));
 169
 170                                                 if not hosts[session.host] then
 171                                                         -- We don't serve this host...
 172                                                         session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
 173                                                         return;
 174                                                 end
 175
 176
 177                                                 local features = st.stanza("stream:features");
 178                                                 modulemanager.fire_event("stream-features", session, features);
 179
 180                                                 send(features);
 181
 182                                                 (session.log or log)("info", "Sent reply <stream:stream> to client");
 183                                                 session.notopen = nil;
 184 end
 185
 186 function send_to_available_resources(user, host, stanza)
 187         local count = 0;
 188         local to = stanza.attr.to;
 189         stanza.attr.to = nil;
 190         local h = hosts[host];
 191         if h and h.type == "local" then
 192                 local u = h.sessions[user];
 193                 if u then
 194                         for k, session in pairs(u.sessions) do
 195                                 if session.presence then
 196                                         session.send(stanza);
 197                                         count = count + 1;
 198                                 end
 199                         end
 200                 end
 201         end
 202         stanza.attr.to = to;
 203         return count;
 204 end
 205
 206 return _M;