core/sessionmanager.lua

   1 -- Prosody IM v0.2
   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 fire_event = require "core.eventmanager".fire_event;
  39
  40 local gettime = require "socket".gettime;
  41
  42 local st = require "util.stanza";
  43
  44 local newproxy = newproxy;
  45 local getmetatable = getmetatable;
  46
  47 module "sessionmanager"
  48
  49 local open_sessions = 0;
  50
  51 function new_session(conn)
  52         local session = { conn = conn,  priority = 0, type = "c2s_unauthed", conntime = gettime() };
  53         if true then
  54                 session.trace = newproxy(true);
  55                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
  56         end
  57         open_sessions = open_sessions + 1;
  58         log("info", "open sessions now: ".. open_sessions);
  59         local w = conn.write;
  60         session.send = function (t) w(tostring(t)); end
  61         return session;
  62 end
  63
  64 function destroy_session(session, err)
  65         (session.log or log)("info", "Destroying session");
  66
  67         -- Send unavailable presence
  68         if session.presence then
  69                 local pres = st.presence{ type = "unavailable" };
  70                 if (not err) or err == "closed" then err = "connection closed"; end
  71                 pres:tag("status"):text("Disconnected: "..err);
  72                 session:dispatch_stanza(pres);
  73         end
  74
  75         -- Remove session/resource from user's session list
  76         if session.host and session.username then
  77                 -- FIXME: How can the below ever be nil? (but they sometimes are...)
  78                 if hosts[session.host] and hosts[session.host].sessions[session.username] then
  79                         if session.resource then
  80                                 hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
  81                         end
  82
  83                         if not next(hosts[session.host].sessions[session.username].sessions) then
  84                                 log("debug", "All resources of %s are now offline", session.username);
  85                                 hosts[session.host].sessions[session.username] = nil;
  86                         end
  87                 else
  88                         log("error", "host or session table didn't exist, please report this! Host: %s [%s] Sessions: %s [%s]",
  89                                         tostring(hosts[session.host]), tostring(session.host),
  90                                         tostring(hosts[session.host].sessions[session.username] ), tostring(session.username));
  91                 end
  92         end
  93
  94         for k in pairs(session) do
  95                 if k ~= "trace" then
  96                         session[k] = nil;
  97                 end
  98         end
  99 end
 100
 101 function make_authenticated(session, username)
 102         session.username = username;
 103         if session.type == "c2s_unauthed" then
 104                 session.type = "c2s";
 105         end
 106         return true;
 107 end
 108
 109 -- returns true, nil on success
 110 -- returns nil, err_type, err, err_message on failure
 111 function bind_resource(session, resource)
 112         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
 113         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
 114         -- We don't support binding multiple resources
 115
 116         resource = resource or uuid_generate();
 117         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 118
 119         if not hosts[session.host].sessions[session.username] then
 120                 hosts[session.host].sessions[session.username] = { sessions = {} };
 121         else
 122                 local sessions = hosts[session.host].sessions[session.username].sessions;
 123                 local limit = config_get(session.host, "core", "max_resources") or 10;
 124                 if #sessions >= limit then
 125                         return nil, "cancel", "conflict", "Resource limit reached; only "..limit.." resources allowed";
 126                 end
 127                 if sessions[resource] then
 128                         -- Resource conflict
 129                         local policy = config_get(session.host, "core", "conflict_resolve");
 130                         local increment;
 131                         if policy == "random" then
 132                                 resource = uuid_generate();
 133                                 increment = true;
 134                         elseif policy == "increment" then
 135                                 increment = true; -- TODO ping old resource
 136                         elseif policy == "kick_new" then
 137                                 return nil, "cancel", "conflict", "Resource already exists";
 138                         else -- if policy == "kick_old" then
 139                                 hosts[session.host].sessions[session.username].sessions[resource]:close {
 140                                         condition = "conflict";
 141                                         text = "Replaced by new connection";
 142                                 };
 143                         end
 144                         if increment and sessions[resource] then
 145                                 local count = 1;
 146                                 while sessions[resource.."#"..count] do
 147                                         count = count + 1;
 148                                 end
 149                                 resource = resource.."#"..count;
 150                         end
 151                 end
 152         end
 153
 154         session.resource = resource;
 155         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 156         hosts[session.host].sessions[session.username].sessions[resource] = session;
 157
 158         session.roster = rm_load_roster(session.username, session.host);
 159
 160         return true;
 161 end
 162
 163 function streamopened(session, attr)
 164                                                 local send = session.send;
 165                                                 session.host = attr.to or error("Client failed to specify destination hostname");
 166                                                 session.version = tonumber(attr.version) or 0;
 167                                                 session.streamid = m_random(1000000, 99999999);
 168                                                 (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
 169
 170
 171                                                 send("<?xml version='1.0'?>");
 172                                                 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));
 173
 174                                                 if not hosts[session.host] then
 175                                                         -- We don't serve this host...
 176                                                         session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
 177                                                         return;
 178                                                 end
 179
 180
 181                                                 local features = st.stanza("stream:features");
 182                                                 fire_event("stream-features", session, features);
 183
 184                                                 send(features);
 185
 186                                                 (session.log or log)("info", "Sent reply <stream:stream> to client");
 187                                                 session.notopen = nil;
 188 end
 189
 190 function send_to_available_resources(user, host, stanza)
 191         local count = 0;
 192         local to = stanza.attr.to;
 193         stanza.attr.to = nil;
 194         local h = hosts[host];
 195         if h and h.type == "local" then
 196                 local u = h.sessions[user];
 197                 if u then
 198                         for k, session in pairs(u.sessions) do
 199                                 if session.presence then
 200                                         session.send(stanza);
 201                                         count = count + 1;
 202                                 end
 203                         end
 204                 end
 205         end
 206         stanza.attr.to = to;
 207         return count;
 208 end
 209
 210 return _M;