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, 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].events.fire_event("resource-unbind", session);
  70
  71                 hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
  72                 full_sessions[session.full_jid] = nil;
  73
  74                 if not next(hosts[session.host].sessions[session.username].sessions) then
  75                         log("debug", "All resources of %s are now offline", session.username);
  76                         hosts[session.host].sessions[session.username] = nil;
  77                         bare_sessions[session.username..'@'..session.host] = nil;
  78                 end
  79         end
  80
  81         for k in pairs(session) do
  82                 if k ~= "trace" then
  83                         session[k] = nil;
  84                 end
  85         end
  86 end
  87
  88 function make_authenticated(session, username)
  89         session.username = username;
  90         if session.type == "c2s_unauthed" then
  91                 session.type = "c2s";
  92         end
  93         session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
  94         return true;
  95 end
  96
  97 -- returns true, nil on success
  98 -- returns nil, err_type, err, err_message on failure
  99 function bind_resource(session, resource)
 100         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
 101         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
 102         -- We don't support binding multiple resources
 103
 104         resource = resource or uuid_generate();
 105         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
 106
 107         if not hosts[session.host].sessions[session.username] then
 108                 local sessions = { sessions = {} };
 109                 hosts[session.host].sessions[session.username] = sessions;
 110                 bare_sessions[session.username..'@'..session.host] = 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                                 sessions[resource]:close {
 130                                         condition = "conflict";
 131                                         text = "Replaced by new connection";
 132                                 };
 133                                 if not next(sessions) then
 134                                         hosts[session.host].sessions[session.username] = { sessions = sessions };
 135                                         bare_sessions[session.username.."@"..session.host] = hosts[session.host].sessions[session.username];
 136                                 end
 137                         end
 138                         if increment and sessions[resource] then
 139                                 local count = 1;
 140                                 while sessions[resource.."#"..count] do
 141                                         count = count + 1;
 142                                 end
 143                                 resource = resource.."#"..count;
 144                         end
 145                 end
 146         end
 147
 148         session.resource = resource;
 149         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 150         hosts[session.host].sessions[session.username].sessions[resource] = session;
 151         full_sessions[session.full_jid] = session;
 152
 153         session.roster = rm_load_roster(session.username, session.host);
 154
 155         hosts[session.host].events.fire_event("resource-bind", session);
 156
 157         return true;
 158 end
 159
 160 function streamopened(session, attr)
 161         local send = session.send;
 162         session.host = attr.to or error("Client failed to specify destination hostname");
 163         session.host = nameprep(session.host);
 164         session.version = tonumber(attr.version) or 0;
 165         session.streamid = m_random(1000000, 99999999);
 166         (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
 167
 168         send("<?xml version='1.0'?>");
 169         send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' version='1.0' xml:lang='en'>", session.streamid, session.host));
 170
 171         if not hosts[session.host] then
 172                 -- We don't serve this host...
 173                 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
 174                 return;
 175         end
 176
 177         -- If session.secure is *false* (not nil) then it means we /were/ encrypting
 178         -- since we now have a new stream header, session is secured
 179         if session.secure == false then
 180                 session.secure = true;
 181         end
 182
 183         local features = st.stanza("stream:features");
 184         fire_event("stream-features", session, features);
 185
 186         send(features);
 187
 188         (session.log or log)("debug", "Sent reply <stream:stream> to client");
 189         session.notopen = nil;
 190 end
 191
 192 function streamclosed(session)
 193         session.send("</stream:stream>");
 194         session.notopen = true;
 195 end
 196
 197 function send_to_available_resources(user, host, stanza)
 198         local count = 0;
 199         local to = stanza.attr.to;
 200         stanza.attr.to = nil;
 201         local h = hosts[host];
 202         if h and h.type == "local" then
 203                 local u = h.sessions[user];
 204                 if u then
 205                         for k, session in pairs(u.sessions) do
 206                                 if session.presence then
 207                                         session.send(stanza);
 208                                         count = count + 1;
 209                                 end
 210                         end
 211                 end
 212         end
 213         stanza.attr.to = to;
 214         return count;
 215 end
 216
 217 return _M;