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core/stanza_router.lua @ 222:6153462397d8
Redirecting all stanzas not from origin of type s2sin and c2s to core_handle_stanza
author | Waqas Hussain <waqas20@gmail.com> |
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date | Sat, 08 Nov 2008 05:06:22 +0500 (2008-11-08) |
parent | 221:641dbdf3b751 |
child | 223:d5dffc919b33 |
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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 component_handle_stanza = require "core.componentmanager".handle_stanza; local format = string.format; local tostring = tostring; local t_concat = table.concat; local t_insert = table.insert; local tonumber = tonumber; local s_find = string.find; local jid_split = require "util.jid".split; local print = print; function core_process_stanza(origin, stanza) log("debug", "Received["..origin.type.."]: "..tostring(st.reply(st.reply(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 -- 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; end 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 origin.type == "s2sin" then if origin.from_host ~= from_host then -- remote server trying to impersonate some other server? log("warn", "Received a stanza claiming to be from %s, over a conn authed for %s!", from, origin.from_host); return; -- FIXME what should we do here? does this work with subdomains? end end --[[if to and not(hosts[to]) and not(hosts[to_bare]) and (hosts[host] and hosts[host].type ~= "local") then -- not for us? log("warn", "stanza recieved for a non-local server"); return; -- FIXME what should we do here? end]] -- FIXME -- FIXME do stanzas not of jabber:client get handled by components? if origin.type == "s2sin" or origin.type == "c2s" then if not to then core_handle_stanza(origin, stanza); elseif hosts[to] and hosts[to].type == "local" then -- directed at a local server 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 hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server component_handle_stanza(origin, stanza); elseif hosts[to] and hosts[to].type == "component" then -- hack to allow components to handle node@server/resource and server/resource component_handle_stanza(origin, stanza); elseif hosts[host] and hosts[host].type == "component" then -- directed at a component component_handle_stanza(origin, stanza); elseif origin.type == "c2s" and stanza.name == "presence" and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare); elseif stanza.name == "iq" and not resource then -- directed at bare JID core_handle_stanza(origin, stanza); else core_route_stanza(origin, stanza); end else core_handle_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 stanza.attr.type == nil and not origin.presence then -- 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 available resources if res ~= origin and res.presence then res.presence.attr.to = origin.full_jid; core_route_stanza(res, res.presence); res.presence.attr.to = nil; end end if origin.roster.pending then -- resend incoming subscription requests for jid in pairs(origin.roster.pending) do origin.send(st.presence({type="subscribe", from=jid})); -- TODO add to attribute? Use original? end end local request = st.presence({type="subscribe", from=origin.username.."@"..origin.host}); for jid, item in pairs(origin.roster) do -- resend outgoing subscription requests if item.ask then request.attr.to = jid; core_route_stanza(origin, request); end end end origin.priority = 0; if stanza.attr.type == "unavailable" then origin.presence = nil; else origin.presence = stanza; local priority = stanza:child_with_name("priority"); if priority and #priority > 0 then priority = t_concat(priority); if s_find(priority, "^[+-]?[0-9]+$") then priority = tonumber(priority); if priority < -128 then priority = -128 end if priority > 127 then priority = 127 end origin.priority = priority; end end end stanza.attr.to = nil; -- reset it else -- TODO error, bad type end end -- TODO handle other stanzas else log("warn", "Unhandled origin: %s", origin.type); -- FIXME reply with error 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 log("debug", "inbound probe from "..from_bare.." for "..to_bare); 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 _, session in pairs(user.sessions) do -- presence broadcast to all user resources. if session.full_jid then -- FIXME should this be just for available resources? Do we need to check subscription? stanza.attr.to = session.full_jid; -- reset at the end of function session.send(stanza); end end end elseif stanza.name == "message" then -- select a resource to recieve message local priority = 0; local recipients = {}; for _, session in pairs(user.sessions) do -- find resource with greatest priority local p = session.priority; if p > priority then priority = p; recipients = {session}; elseif p == priority then t_insert(recipients, session); end end for _, session in pairs(recipient) do session.send(stanza); end 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 elseif origin.type == "component" or origin.type == "local" then -- Route via s2s for components and modules log("debug", "Routing outgoing stanza for %s to %s", origin.host, host); for k,v in pairs(origin) do print("origin:", tostring(k), tostring(v)); end print(tostring(host), tostring(from_host)) send_s2s(origin.host, host, stanza); 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