core/sessionmanager.lua

   1 -- Prosody IM v0.4
   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 full_sessions = full_sessions;
  19 local bare_sessions = bare_sessions;
  20
  21 local modulemanager = require "core.modulemanager";
  22 local log = require "util.logger".init("sessionmanager");
  23 local error = error;
  24 local uuid_generate = require "util.uuid".generate;
  25 local rm_load_roster = require "core.rostermanager".load_roster;
  26 local config_get = require "core.configmanager".get;
  27 local nameprep = require "util.encodings".stringprep.nameprep;
  28
  29 local fire_event = require "core.eventmanager".fire_event;
  30
  31 local gettime = require "socket".gettime;
  32
  33 local st = require "util.stanza";
  34
  35 local newproxy = newproxy;
  36 local getmetatable = getmetatable;
  37
  38 module "sessionmanager"
  39
  40 local open_sessions = 0;
  41
  42 function new_session(conn)
  43         local session = { conn = conn,  priority = 0, type = "c2s_unauthed", conntime = gettime() };
  44         if true then
  45                 session.trace = newproxy(true);
  46                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
  47         end
  48         open_sessions = open_sessions + 1;
  49         log("debug", "open sessions now: ".. open_sessions);
  50         local w = conn.write;
  51         session.send = function (t) w(tostring(t)); end
  52         session.ip = conn.ip();
  53         return session;
  54 end
  55
  56 function destroy_session(session, err)
  57         (session.log or log)("info", "Destroying session for %s (%s@%s)", session.full_jid or "(unknown)", session.username or "(unknown)", session.host or "(unknown)");
  58
  59         -- Send unavailable presence
  60         if session.presence then
  61                 local pres = st.presence{ type = "unavailable" };
  62                 if (not err) or err == "closed" then err = "connection closed"; end
  63                 pres:tag("status"):text("Disconnected: "..err):up();
  64                 session:dispatch_stanza(pres);
  65         end
  66
  67         -- Remove session/resource from user's session list
  68         if session.full_jid then
  69                 hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
  70                 full_sessions[session.full_jid] = nil;
  71
  72                 if not next(hosts[session.host].sessions[session.username].sessions) then
  73                         log("debug", "All resources of %s are now offline", session.username);
  74                         hosts[session.host].sessions[session.username] = nil;
  75                         bare_sessions[session.username..'@'..session.host] = nil;
  76                 end
  77         end
  78
  79         for k in pairs(session) do
  80                 if k ~= "trace" then
  81                         session[k] = nil;
  82                 end
  83         end
  84 end
  85
  86 function make_authenticated(session, username)
  87         session.username = username;
  88         if session.type == "c2s_unauthed" then
  89                 session.type = "c2s";
  90         end
  91         session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
  92         return true;
  93 end
  94
  95 -- returns true, nil on success
  96 -- returns nil, err_type, err, err_message on failure
  97 function bind_resource(session, resource)
  98         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
  99         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
 100         -- We don't support binding multiple resources
 101
 102         resource = resource or uuid_generate();
 103         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 104
 105         if not hosts[session.host].sessions[session.username] then
 106                 local sessions = { sessions = {} };
 107                 hosts[session.host].sessions[session.username] = sessions;
 108                 bare_sessions[session.username..'@'..session.host] = sessions;
 109         else
 110                 local sessions = hosts[session.host].sessions[session.username].sessions;
 111                 local limit = config_get(session.host, "core", "max_resources") or 10;
 112                 if #sessions >= limit then
 113                         return nil, "cancel", "conflict", "Resource limit reached; only "..limit.." resources allowed";
 114                 end
 115                 if sessions[resource] then
 116                         -- Resource conflict
 117                         local policy = config_get(session.host, "core", "conflict_resolve");
 118                         local increment;
 119                         if policy == "random" then
 120                                 resource = uuid_generate();
 121                                 increment = true;
 122                         elseif policy == "increment" then
 123                                 increment = true; -- TODO ping old resource
 124                         elseif policy == "kick_new" then
 125                                 return nil, "cancel", "conflict", "Resource already exists";
 126                         else -- if policy == "kick_old" then
 127                                 sessions[resource]:close {
 128                                         condition = "conflict";
 129                                         text = "Replaced by new connection";
 130                                 };
 131                                 if not next(sessions) then
 132                                         hosts[session.host].sessions[session.username] = { sessions = sessions };
 133                                 end
 134                         end
 135                         if increment and sessions[resource] then
 136                                 local count = 1;
 137                                 while sessions[resource.."#"..count] do
 138                                         count = count + 1;
 139                                 end
 140                                 resource = resource.."#"..count;
 141                         end
 142                 end
 143         end
 144
 145         session.resource = resource;
 146         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 147         hosts[session.host].sessions[session.username].sessions[resource] = session;
 148         full_sessions[session.full_jid] = session;
 149
 150         session.roster = rm_load_roster(session.username, session.host);
 151
 152         return true;
 153 end
 154
 155 function streamopened(session, attr)
 156         local send = session.send;
 157         session.host = attr.to or error("Client failed to specify destination hostname");
 158         session.host = nameprep(session.host);
 159         session.version = tonumber(attr.version) or 0;
 160         session.streamid = m_random(1000000, 99999999);
 161         (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
 162
 163         send("<?xml version='1.0'?>");
 164         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));
 165
 166         if not hosts[session.host] then
 167                 -- We don't serve this host...
 168                 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
 169                 return;
 170         end
 171
 172         -- If session.secure is *false* (not nil) then it means we /were/ encrypting
 173         -- since we now have a new stream header, session is secured
 174         if session.secure == false then
 175                 session.secure = true;
 176         end
 177
 178         local features = st.stanza("stream:features");
 179         fire_event("stream-features", session, features);
 180
 181         send(features);
 182
 183         (session.log or log)("debug", "Sent reply <stream:stream> to client");
 184         session.notopen = nil;
 185 end
 186
 187 function streamclosed(session)
 188         session.send("</stream:stream>");
 189         session.notopen = true;
 190 end
 191
 192 function send_to_available_resources(user, host, stanza)
 193         local count = 0;
 194         local to = stanza.attr.to;
 195         stanza.attr.to = nil;
 196         local h = hosts[host];
 197         if h and h.type == "local" then
 198                 local u = h.sessions[user];
 199                 if u then
 200                         for k, session in pairs(u.sessions) do
 201                                 if session.presence then
 202                                         session.send(stanza);
 203                                         count = count + 1;
 204                                 end
 205                         end
 206                 end
 207         end
 208         stanza.attr.to = to;
 209         return count;
 210 end
 211
 212 return _M;