mirror of
https://github.com/bjc/prosody.git
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358 lines
14 KiB
Lua
358 lines
14 KiB
Lua
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-- The code in this file should be self-explanatory, though the logic is horrible
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-- for more info on that, see doc/stanza_routing.txt, which attempts to condense
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-- the rules from the RFCs (mainly 3921)
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require "core.servermanager"
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local log = require "util.logger".init("stanzarouter")
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local st = require "util.stanza";
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local send_s2s = require "core.s2smanager".send_to_host;
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local user_exists = require "core.usermanager".user_exists;
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local rostermanager = require "core.rostermanager";
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local sessionmanager = require "core.sessionmanager";
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local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
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local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
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local modules_handle_stanza = require "core.modulemanager".handle_stanza;
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local format = string.format;
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local tostring = tostring;
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local t_concat = table.concat;
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local t_insert = table.insert;
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local tonumber = tonumber;
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local s_find = string.find;
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local jid_split = require "util.jid".split;
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local print = print;
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function core_process_stanza(origin, stanza)
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log("debug", "Received["..origin.type.."]: "..tostring(stanza))
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-- TODO verify validity of stanza (as well as JID validity)
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if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then
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if stanza.attr.type == "set" or stanza.attr.type == "get" then
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error("Invalid IQ");
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elseif #stanza.tags > 1 and not(stanza.attr.type == "error" or stanza.attr.type == "result") then
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error("Invalid IQ");
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end
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end
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if origin.type == "c2s" and not origin.full_jid
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and not(stanza.name == "iq" and stanza.tags[1].name == "bind"
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and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
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error("Client MUST bind resource after auth");
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end
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local to = stanza.attr.to;
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-- TODO also, stazas should be returned to their original state before the function ends
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if origin.type == "c2s" then
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stanza.attr.from = origin.full_jid; -- quick fix to prevent impersonation (FIXME this would be incorrect when the origin is not c2s)
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end
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if not to then
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core_handle_stanza(origin, stanza);
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elseif origin.type == "c2s" and stanza.name == "presence" and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
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local node, host = jid_split(stanza.attr.to);
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local to_bare = node and (node.."@"..host) or host; -- bare JID
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local from_node, from_host = jid_split(stanza.attr.from);
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local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
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handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare);
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elseif hosts[to] and hosts[to].type == "local" then
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core_handle_stanza(origin, stanza);
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elseif stanza.name == "iq" and not select(3, jid_split(to)) then
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core_handle_stanza(origin, stanza);
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elseif stanza.attr.xmlns and stanza.attr.xmlns ~= "jabber:client" and stanza.attr.xmlns ~= "jabber:server" then
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modules_handle_stanza(origin, stanza);
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elseif origin.type == "c2s" or origin.type == "s2sin" then
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core_route_stanza(origin, stanza);
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end
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end
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-- This function handles stanzas which are not routed any further,
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-- that is, they are handled by this server
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function core_handle_stanza(origin, stanza)
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-- Handlers
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if modules_handle_stanza(origin, stanza) then return; end
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if origin.type == "c2s" or origin.type == "c2s_unauthed" then
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local session = origin;
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if stanza.name == "presence" and origin.roster then
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if stanza.attr.type == nil or stanza.attr.type == "unavailable" then
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for jid in pairs(origin.roster) do -- broadcast to all interested contacts
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local subscription = origin.roster[jid].subscription;
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if subscription == "both" or subscription == "from" then
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stanza.attr.to = jid;
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core_route_stanza(origin, stanza);
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end
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end
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local node, host = jid_split(stanza.attr.from);
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for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
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if res ~= origin and res.full_jid then -- to resource. FIXME is res.full_jid the correct check? Maybe it should be res.presence
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stanza.attr.to = res.full_jid;
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core_route_stanza(origin, stanza);
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end
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end
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if stanza.attr.type == nil and not origin.presence then -- initial presence
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local probe = st.presence({from = origin.full_jid, type = "probe"});
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for jid in pairs(origin.roster) do -- probe all contacts we are subscribed to
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local subscription = origin.roster[jid].subscription;
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if subscription == "both" or subscription == "to" then
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probe.attr.to = jid;
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core_route_stanza(origin, probe);
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end
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end
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for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all available resources
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if res ~= origin and res.presence then
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res.presence.attr.to = origin.full_jid;
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core_route_stanza(res, res.presence);
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res.presence.attr.to = nil;
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end
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end
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if origin.roster.pending then -- resend incoming subscription requests
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for jid in pairs(origin.roster.pending) do
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origin.send(st.presence({type="subscribe", from=jid})); -- TODO add to attribute? Use original?
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end
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end
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local request = st.presence({type="subscribe", from=origin.username.."@"..origin.host});
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for jid, item in pairs(origin.roster) do -- resend outgoing subscription requests
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if item.ask then
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request.attr.to = jid;
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core_route_stanza(origin, request);
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end
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end
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end
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origin.priority = 0;
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if stanza.attr.type == "unavailable" then
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origin.presence = nil;
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else
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origin.presence = stanza;
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local priority = stanza:child_with_name("priority");
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if priority and #priority > 0 then
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priority = t_concat(priority);
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if s_find(priority, "^[+-]?[0-9]+$") then
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priority = tonumber(priority);
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if priority < -128 then priority = -128 end
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if priority > 127 then priority = 127 end
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origin.priority = priority;
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end
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end
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end
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stanza.attr.to = nil; -- reset it
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else
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-- TODO error, bad type
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end
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end
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else
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log("warn", "Unhandled origin: %s", origin.type);
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end
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end
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function send_presence_of_available_resources(user, host, jid, recipient_session)
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local h = hosts[host];
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local count = 0;
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if h and h.type == "local" then
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local u = h.sessions[user];
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if u then
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for k, session in pairs(u.sessions) do
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local pres = session.presence;
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if pres then
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pres.attr.to = jid;
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pres.attr.from = session.full_jid;
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recipient_session.send(pres);
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pres.attr.to = nil;
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pres.attr.from = nil;
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count = count + 1;
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end
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end
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end
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end
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return count;
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end
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function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare)
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local node, host = jid_split(from_bare);
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local st_from, st_to = stanza.attr.from, stanza.attr.to;
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stanza.attr.from, stanza.attr.to = from_bare, to_bare;
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if stanza.attr.type == "subscribe" then
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log("debug", "outbound subscribe from "..from_bare.." for "..to_bare);
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-- 1. route stanza
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-- 2. roster push (subscription = none, ask = subscribe)
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if rostermanager.set_contact_pending_out(node, host, to_bare) then
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rostermanager.roster_push(node, host, to_bare);
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end -- else file error
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core_route_stanza(origin, stanza);
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elseif stanza.attr.type == "unsubscribe" then
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log("debug", "outbound unsubscribe from "..from_bare.." for "..to_bare);
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-- 1. route stanza
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-- 2. roster push (subscription = none or from)
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if rostermanager.unsubscribe(node, host, to_bare) then
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rostermanager.roster_push(node, host, to_bare); -- FIXME do roster push when roster has in fact not changed?
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end -- else file error
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core_route_stanza(origin, stanza);
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elseif stanza.attr.type == "subscribed" then
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log("debug", "outbound subscribed from "..from_bare.." for "..to_bare);
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-- 1. route stanza
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-- 2. roster_push ()
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-- 3. send_presence_of_available_resources
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if rostermanager.subscribed(node, host, to_bare) then
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rostermanager.roster_push(node, host, to_bare);
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core_route_stanza(origin, stanza);
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send_presence_of_available_resources(node, host, to_bare, origin);
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end
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elseif stanza.attr.type == "unsubscribed" then
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log("debug", "outbound unsubscribed from "..from_bare.." for "..to_bare);
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-- 1. route stanza
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-- 2. roster push (subscription = none or to)
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if rostermanager.unsubscribed(node, host, to_bare) then
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rostermanager.roster_push(node, host, to_bare);
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core_route_stanza(origin, stanza);
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end
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end
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stanza.attr.from, stanza.attr.to = st_from, st_to;
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end
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function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare)
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local node, host = jid_split(to_bare);
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local st_from, st_to = stanza.attr.from, stanza.attr.to;
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stanza.attr.from, stanza.attr.to = from_bare, to_bare;
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if stanza.attr.type == "probe" then
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log("debug", "inbound probe from "..from_bare.." for "..to_bare);
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if rostermanager.is_contact_subscribed(node, host, from_bare) then
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if 0 == send_presence_of_available_resources(node, host, from_bare, origin) then
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-- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
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end
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else
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core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="unsubscribed"}));
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end
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elseif stanza.attr.type == "subscribe" then
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log("debug", "inbound subscribe from "..from_bare.." for "..to_bare);
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if rostermanager.is_contact_subscribed(node, host, from_bare) then
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core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="subscribed"})); -- already subscribed
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else
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if not rostermanager.is_contact_pending_in(node, host, from_bare) then
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if rostermanager.set_contact_pending_in(node, host, from_bare) then
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sessionmanager.send_to_available_resources(node, host, stanza);
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end -- TODO else return error, unable to save
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end
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end
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elseif stanza.attr.type == "unsubscribe" then
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log("debug", "inbound unsubscribe from "..from_bare.." for "..to_bare);
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if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then
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rostermanager.roster_push(node, host, from_bare);
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end
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elseif stanza.attr.type == "subscribed" then
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log("debug", "inbound subscribed from "..from_bare.." for "..to_bare);
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if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then
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rostermanager.roster_push(node, host, from_bare);
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end
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elseif stanza.attr.type == "unsubscribed" then
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log("debug", "inbound unsubscribed from "..from_bare.." for "..to_bare);
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if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then
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rostermanager.roster_push(node, host, from_bare);
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end
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end -- discard any other type
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stanza.attr.from, stanza.attr.to = st_from, st_to;
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end
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function core_route_stanza(origin, stanza)
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-- Hooks
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--- ...later
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-- Deliver
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local to = stanza.attr.to;
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local node, host, resource = jid_split(to);
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local to_bare = node and (node.."@"..host) or host; -- bare JID
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local from = stanza.attr.from;
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local from_node, from_host, from_resource = jid_split(from);
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local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
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if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable") then resource = nil; end
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local host_session = hosts[host]
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if host_session and host_session.type == "local" then
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-- Local host
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local user = host_session.sessions[node];
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if user then
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local res = user.sessions[resource];
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if not res then
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-- if we get here, resource was not specified or was unavailable
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if stanza.name == "presence" then
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if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
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handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare);
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else -- sender is available or unavailable
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for _, session in pairs(user.sessions) do -- presence broadcast to all user resources.
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if session.full_jid then -- FIXME should this be just for available resources? Do we need to check subscription?
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stanza.attr.to = session.full_jid; -- reset at the end of function
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session.send(stanza);
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end
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end
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end
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elseif stanza.name == "message" then -- select a resource to recieve message
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local priority = 0;
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local recipients = {};
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for _, session in pairs(user.sessions) do -- find resource with greatest priority
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local p = session.priority;
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if p > priority then
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priority = p;
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recipients = {session};
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elseif p == priority then
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t_insert(recipients, session);
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end
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end
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for _, session in pairs(recipient) do
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session.send(stanza);
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end
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else
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-- TODO send IQ error
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end
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else
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-- User + resource is online...
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stanza.attr.to = res.full_jid; -- reset at the end of function
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res.send(stanza); -- Yay \o/
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end
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else
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-- user not online
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if user_exists(node, host) then
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if stanza.name == "presence" then
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if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
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handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare);
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else
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-- TODO send unavailable presence or unsubscribed
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end
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elseif stanza.name == "message" then
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-- TODO send message error, or store offline messages
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elseif stanza.name == "iq" then
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-- TODO send IQ error
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end
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else -- user does not exist
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-- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses?
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if stanza.name == "presence" then
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if stanza.attr.type == "probe" then
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origin.send(st.presence({from = to_bare, to = from_bare, type = "unsubscribed"}));
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end
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-- else ignore
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else
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origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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end
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end
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end
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elseif origin.type == "c2s" then
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-- Remote host
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local xmlns = stanza.attr.xmlns;
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--stanza.attr.xmlns = "jabber:server";
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stanza.attr.xmlns = nil;
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log("debug", "sending s2s stanza: %s", tostring(stanza));
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send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors
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stanza.attr.xmlns = xmlns; -- reset
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else
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log("warn", "received stanza from unhandled connection type: %s", origin.type);
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end
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stanza.attr.to = to; -- reset
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end
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function handle_stanza_toremote(stanza)
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log("error", "Stanza bound for remote host, but s2s is not implemented");
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end
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