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core/stanza_router.lua @ 198:e4755408d40b
Fix for previous commit (again)
author | Matthew Wild <mwild1@gmail.com> |
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date | Sun, 02 Nov 2008 01:30:36 +0000 |
parent | 192:71c389c6fc2e |
child | 199:eccf66b42bd7 |
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-- The code in this file should be self-explanatory, though the logic is horrible -- for more info on that, see doc/stanza_routing.txt, which attempts to condense -- the rules from the RFCs (mainly 3921) require "core.servermanager" local log = require "util.logger".init("stanzarouter") local st = require "util.stanza"; local send_s2s = require "core.s2smanager".send_to_host; local user_exists = require "core.usermanager".user_exists; local rostermanager = require "core.rostermanager"; local sessionmanager = require "core.sessionmanager"; local s2s_verify_dialback = require "core.s2smanager".verify_dialback; local s2s_make_authenticated = require "core.s2smanager".make_authenticated; local modules_handle_stanza = require "core.modulemanager".handle_stanza; local format = string.format; local tostring = tostring; local jid_split = require "util.jid".split; local print = print; function core_process_stanza(origin, stanza) log("debug", "Received["..origin.type.."]: "..tostring(stanza)) -- TODO verify validity of stanza (as well as JID validity) if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then if stanza.attr.type == "set" or stanza.attr.type == "get" then error("Invalid IQ"); elseif #stanza.tags > 1 and not(stanza.attr.type == "error" or stanza.attr.type == "result") then error("Invalid IQ"); end end if origin.type == "c2s" and not origin.full_jid and not(stanza.name == "iq" and stanza.tags[1].name == "bind" and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then error("Client MUST bind resource after auth"); end local to = stanza.attr.to; -- TODO also, stazas should be returned to their original state before the function ends if origin.type == "c2s" then stanza.attr.from = origin.full_jid; -- quick fix to prevent impersonation (FIXME this would be incorrect when the origin is not c2s) end if not to then core_handle_stanza(origin, stanza); elseif origin.type == "c2s" and stanza.name == "presence" and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then local node, host = jid_split(stanza.attr.to); local to_bare = node and (node.."@"..host) or host; -- bare JID local from_node, from_host = jid_split(stanza.attr.from); local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare); elseif hosts[to] and hosts[to].type == "local" then core_handle_stanza(origin, stanza); elseif stanza.name == "iq" and not select(3, jid_split(to)) then core_handle_stanza(origin, stanza); elseif stanza.attr.xmlns and stanza.attr.xmlns ~= "jabber:client" and stanza.attr.xmlns ~= "jabber:server" then modules_handle_stanza(origin, stanza); elseif origin.type == "c2s" or origin.type == "s2sin" then core_route_stanza(origin, stanza); end end -- This function handles stanzas which are not routed any further, -- that is, they are handled by this server function core_handle_stanza(origin, stanza) -- Handlers if modules_handle_stanza(origin, stanza) then return; end if origin.type == "c2s" or origin.type == "c2s_unauthed" then local session = origin; if stanza.name == "presence" and origin.roster then if stanza.attr.type == nil or stanza.attr.type == "unavailable" then for jid in pairs(origin.roster) do -- broadcast to all interested contacts local subscription = origin.roster[jid].subscription; if subscription == "both" or subscription == "from" then stanza.attr.to = jid; core_route_stanza(origin, stanza); end end local node, host = jid_split(stanza.attr.from); for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources if res ~= origin and res.full_jid then -- to resource. FIXME is res.full_jid the correct check? Maybe it should be res.presence stanza.attr.to = res.full_jid; core_route_stanza(origin, stanza); end end if not origin.presence then -- presence probes on initial presence -- FIXME does unavailable qualify as initial presence? local probe = st.presence({from = origin.full_jid, type = "probe"}); for jid in pairs(origin.roster) do -- probe all contacts we are subscribed to local subscription = origin.roster[jid].subscription; if subscription == "both" or subscription == "to" then probe.attr.to = jid; core_route_stanza(origin, probe); end end for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all resources if res ~= origin and stanza.attr.type ~= "unavailable" and res.presence then -- FIXME does unavailable qualify as initial presence? res.presence.attr.to = origin.full_jid; core_route_stanza(res, res.presence); res.presence.attr.to = nil; end end -- TODO resend subscription requests end origin.presence = stanza; stanza.attr.to = nil; -- reset it else -- TODO error, bad type end end else log("warn", "Unhandled origin: %s", origin.type); end end function send_presence_of_available_resources(user, host, jid, recipient_session) local h = hosts[host]; local count = 0; if h and h.type == "local" then local u = h.sessions[user]; if u then for k, session in pairs(u.sessions) do local pres = session.presence; if pres then pres.attr.to = jid; pres.attr.from = session.full_jid; recipient_session.send(pres); pres.attr.to = nil; pres.attr.from = nil; count = count + 1; end end end end return count; end function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare) local node, host = jid_split(from_bare); local st_from, st_to = stanza.attr.from, stanza.attr.to; stanza.attr.from, stanza.attr.to = from_bare, to_bare; if stanza.attr.type == "subscribe" then log("debug", "outbound subscribe from "..from_bare.." for "..to_bare); -- 1. route stanza -- 2. roster push (subscription = none, ask = subscribe) if rostermanager.set_contact_pending_out(node, host, to_bare) then rostermanager.roster_push(node, host, to_bare); end -- else file error core_route_stanza(origin, stanza); elseif stanza.attr.type == "unsubscribe" then log("debug", "outbound unsubscribe from "..from_bare.." for "..to_bare); -- 1. route stanza -- 2. roster push (subscription = none or from) if rostermanager.unsubscribe(node, host, to_bare) then rostermanager.roster_push(node, host, to_bare); -- FIXME do roster push when roster has in fact not changed? end -- else file error core_route_stanza(origin, stanza); elseif stanza.attr.type == "subscribed" then log("debug", "outbound subscribed from "..from_bare.." for "..to_bare); -- 1. route stanza -- 2. roster_push () -- 3. send_presence_of_available_resources if rostermanager.subscribed(node, host, to_bare) then rostermanager.roster_push(node, host, to_bare); core_route_stanza(origin, stanza); send_presence_of_available_resources(node, host, to_bare, origin); end elseif stanza.attr.type == "unsubscribed" then log("debug", "outbound unsubscribed from "..from_bare.." for "..to_bare); -- 1. route stanza -- 2. roster push (subscription = none or to) if rostermanager.unsubscribed(node, host, to_bare) then rostermanager.roster_push(node, host, to_bare); core_route_stanza(origin, stanza); end end stanza.attr.from, stanza.attr.to = st_from, st_to; end function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare) local node, host = jid_split(to_bare); local st_from, st_to = stanza.attr.from, stanza.attr.to; stanza.attr.from, stanza.attr.to = from_bare, to_bare; if stanza.attr.type == "probe" then if rostermanager.is_contact_subscribed(node, host, from_bare) then if 0 == send_presence_of_available_resources(node, host, from_bare, origin) then -- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too) end else core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="unsubscribed"})); end elseif stanza.attr.type == "subscribe" then log("debug", "inbound subscribe from "..from_bare.." for "..to_bare); if rostermanager.is_contact_subscribed(node, host, from_bare) then core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="subscribed"})); -- already subscribed else if not rostermanager.is_contact_pending_in(node, host, from_bare) then if rostermanager.set_contact_pending_in(node, host, from_bare) then sessionmanager.send_to_available_resources(node, host, stanza); end -- TODO else return error, unable to save end end elseif stanza.attr.type == "unsubscribe" then log("debug", "inbound unsubscribe from "..from_bare.." for "..to_bare); if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then rostermanager.roster_push(node, host, from_bare); end elseif stanza.attr.type == "subscribed" then log("debug", "inbound subscribed from "..from_bare.." for "..to_bare); if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then rostermanager.roster_push(node, host, from_bare); end elseif stanza.attr.type == "unsubscribed" then log("debug", "inbound unsubscribed from "..from_bare.." for "..to_bare); if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then rostermanager.roster_push(node, host, from_bare); end end -- discard any other type stanza.attr.from, stanza.attr.to = st_from, st_to; end function core_route_stanza(origin, stanza) -- Hooks --- ...later -- Deliver local to = stanza.attr.to; local node, host, resource = jid_split(to); local to_bare = node and (node.."@"..host) or host; -- bare JID local from = stanza.attr.from; local from_node, from_host, from_resource = jid_split(from); local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable") then resource = nil; end local host_session = hosts[host] if host_session and host_session.type == "local" then -- Local host local user = host_session.sessions[node]; if user then local res = user.sessions[resource]; if not res then -- if we get here, resource was not specified or was unavailable if stanza.name == "presence" then if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare); else -- sender is available or unavailable for k in pairs(user.sessions) do -- presence broadcast to all user resources. FIXME should this be just for available resources? Do we need to check subscription? if user.sessions[k].full_jid then stanza.attr.to = user.sessions[k].full_jid; -- reset at the end of function user.sessions[k].send(stanza); end end end elseif stanza.name == "message" then -- select a resource to recieve message for k in pairs(user.sessions) do if user.sessions[k].full_jid then res = user.sessions[k]; break; end end -- TODO find resource with greatest priority res.send(stanza); else -- TODO send IQ error end else -- User + resource is online... stanza.attr.to = res.full_jid; -- reset at the end of function res.send(stanza); -- Yay \o/ end else -- user not online if user_exists(node, host) then if stanza.name == "presence" then if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare); else -- TODO send unavailable presence or unsubscribed end elseif stanza.name == "message" then -- TODO send message error, or store offline messages elseif stanza.name == "iq" then -- TODO send IQ error end else -- user does not exist -- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses? if stanza.name == "presence" then if stanza.attr.type == "probe" then origin.send(st.presence({from = to_bare, to = from_bare, type = "unsubscribed"})); end -- else ignore else origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); end end end elseif origin.type == "c2s" then -- Remote host local xmlns = stanza.attr.xmlns; --stanza.attr.xmlns = "jabber:server"; stanza.attr.xmlns = nil; log("debug", "sending s2s stanza: %s", tostring(stanza)); send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors stanza.attr.xmlns = xmlns; -- reset else log("warn", "received stanza from unhandled connection type: %s", origin.type); end stanza.attr.to = to; -- reset end function handle_stanza_toremote(stanza) log("error", "Stanza bound for remote host, but s2s is not implemented"); end