core/sessionmanager.lua

   1
   2 local tonumber, tostring = tonumber, tostring;
   3 local ipairs, pairs, print, next= ipairs, pairs, print, next;
   4 local collectgarbage = collectgarbage;
   5 local m_random = import("math", "random");
   6 local format = import("string", "format");
   7
   8 local hosts = hosts;
   9 local sessions = sessions;
  10
  11 local modulemanager = require "core.modulemanager";
  12 local log = require "util.logger".init("sessionmanager");
  13 local error = error;
  14 local uuid_generate = require "util.uuid".generate;
  15 local rm_load_roster = require "core.rostermanager".load_roster;
  16 local config_get = require "core.configmanager".get;
  17
  18 local st = require "util.stanza";
  19
  20 local newproxy = newproxy;
  21 local getmetatable = getmetatable;
  22
  23 module "sessionmanager"
  24
  25 local open_sessions = 0;
  26
  27 function new_session(conn)
  28         local session = { conn = conn,  priority = 0, type = "c2s_unauthed" };
  29         if true then
  30                 session.trace = newproxy(true);
  31                 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; print("Session got collected, now "..open_sessions.." sessions are allocated") end;
  32         end
  33         open_sessions = open_sessions + 1;
  34         log("info", "open sessions now: ".. open_sessions);
  35         local w = conn.write;
  36         session.send = function (t) w(tostring(t)); end
  37         return session;
  38 end
  39
  40 function destroy_session(session, err)
  41         (session.log or log)("info", "Destroying session");
  42
  43         -- Send unavailable presence
  44         if session.presence then
  45                 local pres = st.presence{ type = "unavailable" };
  46                 if (not err) or err == "closed" then err = "connection closed"; end
  47                 pres:tag("status"):text("Disconnected: "..err);
  48                 session.stanza_dispatch(pres);
  49         end
  50
  51         -- Remove session/resource from user's session list
  52         if session.host and session.username then
  53                 if session.resource then
  54                         hosts[session.host].sessions[session.username].sessions[session.resource] = nil;
  55                 end
  56                 if hosts[session.host] and hosts[session.host].sessions[session.username] then
  57                         if not next(hosts[session.host].sessions[session.username].sessions) then
  58                                 log("debug", "All resources of %s are now offline", session.username);
  59                                 hosts[session.host].sessions[session.username] = nil;
  60                         end
  61                 end
  62         end
  63
  64         for k in pairs(session) do
  65                 if k ~= "trace" then
  66                         session[k] = nil;
  67                 end
  68         end
  69 end
  70
  71 function make_authenticated(session, username)
  72         session.username = username;
  73         if session.type == "c2s_unauthed" then
  74                 session.type = "c2s";
  75         end
  76         return true;
  77 end
  78
  79 -- returns true, nil on success
  80 -- returns nil, err_type, err, err_message on failure
  81 function bind_resource(session, resource)
  82         if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
  83         if session.resource then return nil, "cancel", "already-bound", "Cannot bind multiple resources on a single connection"; end
  84         -- We don't support binding multiple resources
  85
  86         resource = resource or uuid_generate();
  87         --FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
  88
  89         if not hosts[session.host].sessions[session.username] then
  90                 hosts[session.host].sessions[session.username] = { sessions = {} };
  91         else
  92                 local sessions = hosts[session.host].sessions[session.username].sessions;
  93                 local limit = config_get(session.host, "core", "max_resources") or 10;
  94                 if #sessions >= limit then
  95                         return nil, "cancel", "conflict", "Resource limit reached; only "..limit.." resources allowed";
  96                 end
  97                 if sessions[resource] then
  98                         -- Resource conflict
  99                         local policy = config_get(session.host, "core", "conflict_resolve");
 100                         local increment;
 101                         if policy == "random" then
 102                                 resource = uuid_generate();
 103                                 increment = true;
 104                         elseif policy == "increment" then
 105                                 increment = true; -- TODO ping old resource
 106                         elseif policy == "kick_new" then
 107                                 return nil, "cancel", "conflict", "Resource already exists";
 108                         else -- if policy == "kick_old" then
 109                                 hosts[session.host].sessions[session.username].sessions[resource]:close {
 110                                         condition = "conflict";
 111                                         text = "Replaced by new connection";
 112                                 };
 113                         end
 114                         if increment and sessions[resource] then
 115                                 local count = 1;
 116                                 while sessions[resource.."#"..count] do
 117                                         count = count + 1;
 118                                 end
 119                                 resource = resource.."#"..count;
 120                         end
 121                 end
 122         end
 123
 124         session.resource = resource;
 125         session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
 126         hosts[session.host].sessions[session.username].sessions[resource] = session;
 127
 128         session.roster = rm_load_roster(session.username, session.host);
 129
 130         return true;
 131 end
 132
 133 function streamopened(session, attr)
 134                                                 local send = session.send;
 135                                                 session.host = attr.to or error("Client failed to specify destination hostname");
 136                                                 session.version = tonumber(attr.version) or 0;
 137                                                 session.streamid = m_random(1000000, 99999999);
 138                                                 (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
 139
 140
 141                                                 send("<?xml version='1.0'?>");
 142                                                 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));
 143
 144                                                 if not hosts[session.host] then
 145                                                         -- We don't serve this host...
 146                                                         session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
 147                                                         return;
 148                                                 end
 149
 150
 151                                                 local features = st.stanza("stream:features");
 152                                                 modulemanager.fire_event("stream-features", session, features);
 153
 154                                                 send(features);
 155
 156                                                 (session.log or log)("info", "Sent reply <stream:stream> to client");
 157                                                 session.notopen = nil;
 158 end
 159
 160 function send_to_available_resources(user, host, stanza)
 161         local count = 0;
 162         local to = stanza.attr.to;
 163         stanza.attr.to = nil;
 164         local h = hosts[host];
 165         if h and h.type == "local" then
 166                 local u = h.sessions[user];
 167                 if u then
 168                         for k, session in pairs(u.sessions) do
 169                                 if session.presence then
 170                                         session.send(stanza);
 171                                         count = count + 1;
 172                                 end
 173                         end
 174                 end
 175         end
 176         stanza.attr.to = to;
 177         return count;
 178 end
 179
 180 return _M;