core/sessionmanager.lua

   1 -- Prosody IM v0.3
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 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
  10
  11 local tonumber, tostring = tonumber, tostring;
  12 local ipairs, pairs, print, next= ipairs, pairs, print, next;
  13 local collectgarbage = collectgarbage;
  14 local m_random = import("math", "random");
  15 local format = import("string", "format");
  16
  17 local hosts = hosts;
  18 local sessions = sessions;
  19
  20 local modulemanager = require "core.modulemanager";
  21 local log = require "util.logger".init("sessionmanager");
  22 local error = error;
  23 local uuid_generate = require "util.uuid".generate;
  24 local rm_load_roster = require "core.rostermanager".load_roster;
  25 local config_get = require "core.configmanager".get;
  26
  27 local fire_event = require "core.eventmanager".fire_event;
  28
  29 local gettime = require "socket".gettime;
  30
  31 local st = require "util.stanza";
  32
  33 local newproxy = newproxy;
  34 local getmetatable = getmetatable;
  35
  36 module "sessionmanager"
  37
  38 local open_sessions = 0;
  39
  40 function new_session(conn)
  41         local session = { conn = conn,  priority = 0, type = "c2s_unauthed", conntime = gettime() };
  42         if true then
  43                 session.trace = newproxy(true);
  44                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
  45         end
  46         open_sessions = open_sessions + 1;
  47         log("info", "open sessions now: ".. open_sessions);
  48         local w = conn.write;
  49         session.send = function (t) w(tostring(t)); end
  50         session.ip = conn.ip();
  51         return session;
  52 end
  53
  54 function destroy_session(session, err)
  55         (session.log or log)("info", "Destroying session");
  56
  57         -- Send unavailable presence
  58         if session.presence then
  59                 local pres = st.presence{ type = "unavailable" };
  60                 if (not err) or err == "closed" then err = "connection closed"; end
  61                 pres:tag("status"):text("Disconnected: "..err);
  62                 session:dispatch_stanza(pres);
  63         end
  64
  65         -- Remove session/resource from user's session list
  66         if session.host and session.username then
  67                 -- FIXME: How can the below ever be nil? (but they sometimes are...)
  68                 if hosts[session.host] and hosts[session.host].sessions[session.username] then
  69                         if session.resource then
  70                                 hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
  71                         end
  72
  73                         if not next(hosts[session.host].sessions[session.username].sessions) then
  74                                 log("debug", "All resources of %s are now offline", session.username);
  75                                 hosts[session.host].sessions[session.username] = nil;
  76                         end
  77                 else
  78                         log("error", "host or session table didn't exist, please report this! Host: %s [%s] Sessions: %s [%s]",
  79                                         tostring(hosts[session.host]), tostring(session.host),
  80                                         tostring(hosts[session.host].sessions[session.username] ), tostring(session.username));
  81                 end
  82         end
  83
  84         for k in pairs(session) do
  85                 if k ~= "trace" then
  86                         session[k] = nil;
  87                 end
  88         end
  89 end
  90
  91 function make_authenticated(session, username)
  92         session.username = username;
  93         if session.type == "c2s_unauthed" then
  94                 session.type = "c2s";
  95         end
  96         return true;
  97 end
  98
  99 -- returns true, nil on success
 100 -- returns nil, err_type, err, err_message on failure
 101 function bind_resource(session, resource)
 102         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
 103         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
 104         -- We don't support binding multiple resources
 105
 106         resource = resource or uuid_generate();
 107         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 108
 109         if not hosts[session.host].sessions[session.username] then
 110                 hosts[session.host].sessions[session.username] = { sessions = {} };
 111         else
 112                 local sessions = hosts[session.host].sessions[session.username].sessions;
 113                 local limit = config_get(session.host, "core", "max_resources") or 10;
 114                 if #sessions >= limit then
 115                         return nil, "cancel", "conflict", "Resource limit reached; only "..limit.." resources allowed";
 116                 end
 117                 if sessions[resource] then
 118                         -- Resource conflict
 119                         local policy = config_get(session.host, "core", "conflict_resolve");
 120                         local increment;
 121                         if policy == "random" then
 122                                 resource = uuid_generate();
 123                                 increment = true;
 124                         elseif policy == "increment" then
 125                                 increment = true; -- TODO ping old resource
 126                         elseif policy == "kick_new" then
 127                                 return nil, "cancel", "conflict", "Resource already exists";
 128                         else -- if policy == "kick_old" then
 129                                 hosts[session.host].sessions[session.username].sessions[resource]:close {
 130                                         condition = "conflict";
 131                                         text = "Replaced by new connection";
 132                                 };
 133                         end
 134                         if increment and sessions[resource] then
 135                                 local count = 1;
 136                                 while sessions[resource.."#"..count] do
 137                                         count = count + 1;
 138                                 end
 139                                 resource = resource.."#"..count;
 140                         end
 141                 end
 142         end
 143
 144         session.resource = resource;
 145         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 146         hosts[session.host].sessions[session.username].sessions[resource] = session;
 147
 148         session.roster = rm_load_roster(session.username, session.host);
 149
 150         return true;
 151 end
 152
 153 function streamopened(session, attr)
 154                                                 local send = session.send;
 155                                                 session.host = attr.to or error("Client failed to specify destination hostname");
 156                                                 session.version = tonumber(attr.version) or 0;
 157                                                 session.streamid = m_random(1000000, 99999999);
 158                                                 (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
 159
 160
 161                                                 send("<?xml version='1.0'?>");
 162                                                 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));
 163
 164                                                 if not hosts[session.host] then
 165                                                         -- We don't serve this host...
 166                                                         session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
 167                                                         return;
 168                                                 end
 169
 170
 171                                                 local features = st.stanza("stream:features");
 172                                                 fire_event("stream-features", session, features);
 173
 174                                                 send(features);
 175
 176                                                 (session.log or log)("info", "Sent reply <stream:stream> to client");
 177                                                 session.notopen = nil;
 178 end
 179
 180 function send_to_available_resources(user, host, stanza)
 181         local count = 0;
 182         local to = stanza.attr.to;
 183         stanza.attr.to = nil;
 184         local h = hosts[host];
 185         if h and h.type == "local" then
 186                 local u = h.sessions[user];
 187                 if u then
 188                         for k, session in pairs(u.sessions) do
 189                                 if session.presence then
 190                                         session.send(stanza);
 191                                         count = count + 1;
 192                                 end
 193                         end
 194                 end
 195         end
 196         stanza.attr.to = to;
 197         return count;
 198 end
 199
 200 return _M;