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