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Diffstat (limited to 'plugins/s2s/s2sout.lib.lua')
| -rw-r--r-- | plugins/s2s/s2sout.lib.lua | 352 |
1 files changed, 0 insertions, 352 deletions
diff --git a/plugins/s2s/s2sout.lib.lua b/plugins/s2s/s2sout.lib.lua deleted file mode 100644 index f3496597..00000000 --- a/plugins/s2s/s2sout.lib.lua +++ /dev/null @@ -1,352 +0,0 @@ --- Prosody IM --- Copyright (C) 2008-2010 Matthew Wild --- Copyright (C) 2008-2010 Waqas Hussain --- --- This project is MIT/X11 licensed. Please see the --- COPYING file in the source package for more information. --- - ---- Module containing all the logic for connecting to a remote server - -local portmanager = require "core.portmanager"; -local wrapclient = require "net.server".wrapclient; -local initialize_filters = require "util.filters".initialize; -local idna_to_ascii = require "util.encodings".idna.to_ascii; -local new_ip = require "util.ip".new_ip; -local rfc3484_dest = require "util.rfc3484".destination; -local socket = require "socket"; -local adns = require "net.adns"; -local dns = require "net.dns"; -local t_insert, t_sort, ipairs = table.insert, table.sort, ipairs; -local st = require "util.stanza"; - -local s2s_destroy_session = require "core.s2smanager".destroy_session; - -local log = module._log; - -local sources = {}; - -local max_dns_depth = module:get_option_number("dns_max_depth", 3); - -local s2sout = {}; - -local s2s_listener; - - -function s2sout.set_listener(listener) - s2s_listener = listener; -end - -local function compare_srv_priorities(a,b) - return a.priority < b.priority or (a.priority == b.priority and a.weight > b.weight); -end - -local function session_open_stream(session, from, to) - session.sends2s(st.stanza("stream:stream", { - xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', - ["xmlns:stream"]='http://etherx.jabber.org/streams', - from=from, to=to, version='1.0', ["xml:lang"]='en'}):top_tag()); -end - -function s2sout.initiate_connection(host_session) - initialize_filters(host_session); - host_session.open_stream = session_open_stream; - - -- Kick the connection attempting machine into life - if not s2sout.attempt_connection(host_session) then - -- Intentionally not returning here, the - -- session is needed, connected or not - s2s_destroy_session(host_session); - end - - if not host_session.sends2s then - -- A sends2s which buffers data (until the stream is opened) - -- note that data in this buffer will be sent before the stream is authed - -- and will not be ack'd in any way, successful or otherwise - local buffer; - function host_session.sends2s(data) - if not buffer then - buffer = {}; - host_session.send_buffer = buffer; - end - log("debug", "Buffering data on unconnected s2sout to %s", tostring(host_session.to_host)); - buffer[#buffer+1] = data; - log("debug", "Buffered item %d: %s", #buffer, tostring(data)); - end - end -end - -function s2sout.attempt_connection(host_session, err) - local from_host, to_host = host_session.from_host, host_session.to_host; - local connect_host, connect_port = to_host and idna_to_ascii(to_host), 5269; - - if not connect_host then - return false; - end - - if not err then -- This is our first attempt - log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host); - host_session.connecting = true; - local handle; - handle = adns.lookup(function (answer) - handle = nil; - host_session.connecting = nil; - if answer then - log("debug", to_host.." has SRV records, handling..."); - local srv_hosts = {}; - host_session.srv_hosts = srv_hosts; - for _, record in ipairs(answer) do - t_insert(srv_hosts, record.srv); - end - if #srv_hosts == 1 and srv_hosts[1].target == "." then - log("debug", to_host.." does not provide a XMPP service"); - s2s_destroy_session(host_session, err); -- Nothing to see here - return; - end - t_sort(srv_hosts, compare_srv_priorities); - - local srv_choice = srv_hosts[1]; - host_session.srv_choice = 1; - if srv_choice then - connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; - log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); - end - else - log("debug", to_host.." has no SRV records, falling back to A"); - end - -- Try with SRV, or just the plain hostname if no SRV - local ok, err = s2sout.try_connect(host_session, connect_host, connect_port); - if not ok then - if not s2sout.attempt_connection(host_session, err) then - -- No more attempts will be made - s2s_destroy_session(host_session, err); - end - end - end, "_xmpp-server._tcp."..connect_host..".", "SRV"); - - return true; -- Attempt in progress - elseif host_session.ip_hosts then - return s2sout.try_connect(host_session, connect_host, connect_port, err); - elseif host_session.srv_hosts and #host_session.srv_hosts > host_session.srv_choice then -- Not our first attempt, and we also have SRV - host_session.srv_choice = host_session.srv_choice + 1; - local srv_choice = host_session.srv_hosts[host_session.srv_choice]; - connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; - host_session.log("info", "Connection failed (%s). Attempt #%d: This time to %s:%d", tostring(err), host_session.srv_choice, connect_host, connect_port); - else - host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); - -- We're out of options - return false; - end - - if not (connect_host and connect_port) then - -- Likely we couldn't resolve DNS - log("warn", "Hmm, we're without a host (%s) and port (%s) to connect to for %s, giving up :(", tostring(connect_host), tostring(connect_port), tostring(to_host)); - return false; - end - - return s2sout.try_connect(host_session, connect_host, connect_port); -end - -function s2sout.try_next_ip(host_session) - host_session.connecting = nil; - host_session.ip_choice = host_session.ip_choice + 1; - local ip = host_session.ip_hosts[host_session.ip_choice]; - local ok, err= s2sout.make_connect(host_session, ip.ip, ip.port); - if not ok then - if not s2sout.attempt_connection(host_session, err or "closed") then - err = err and (": "..err) or ""; - s2s_destroy_session(host_session, "Connection failed"..err); - end - end -end - -function s2sout.try_connect(host_session, connect_host, connect_port, err) - host_session.connecting = true; - - if not err then - local IPs = {}; - host_session.ip_hosts = IPs; - local handle4, handle6; - local has_other = false; - - handle4 = adns.lookup(function (reply, err) - handle4 = nil; - - -- COMPAT: This is a compromise for all you CNAME-(ab)users :) - if not (reply and reply[#reply] and reply[#reply].a) then - local count = max_dns_depth; - reply = dns.peek(connect_host, "CNAME", "IN"); - while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do - log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count); - reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN"); - count = count - 1; - end - end - -- end of CNAME resolving - - if reply and reply[#reply] and reply[#reply].a then - for _, ip in ipairs(reply) do - log("debug", "DNS reply for %s gives us %s", connect_host, ip.a); - IPs[#IPs+1] = new_ip(ip.a, "IPv4"); - end - end - - if has_other then - if #IPs > 0 then - rfc3484_dest(host_session.ip_hosts, sources); - for i = 1, #IPs do - IPs[i] = {ip = IPs[i], port = connect_port}; - end - host_session.ip_choice = 0; - s2sout.try_next_ip(host_session); - else - log("debug", "DNS lookup failed to get a response for %s", connect_host); - host_session.ip_hosts = nil; - if not s2sout.attempt_connection(host_session, "name resolution failed") then -- Retry if we can - log("debug", "No other records to try for %s - destroying", host_session.to_host); - err = err and (": "..err) or ""; - s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't - end - end - else - has_other = true; - end - end, connect_host, "A", "IN"); - - handle6 = adns.lookup(function (reply, err) - handle6 = nil; - - if reply and reply[#reply] and reply[#reply].aaaa then - for _, ip in ipairs(reply) do - log("debug", "DNS reply for %s gives us %s", connect_host, ip.aaaa); - IPs[#IPs+1] = new_ip(ip.aaaa, "IPv6"); - end - end - - if has_other then - if #IPs > 0 then - rfc3484_dest(host_session.ip_hosts, sources); - for i = 1, #IPs do - IPs[i] = {ip = IPs[i], port = connect_port}; - end - host_session.ip_choice = 0; - s2sout.try_next_ip(host_session); - else - log("debug", "DNS lookup failed to get a response for %s", connect_host); - host_session.ip_hosts = nil; - if not s2sout.attempt_connection(host_session, "name resolution failed") then -- Retry if we can - log("debug", "No other records to try for %s - destroying", host_session.to_host); - err = err and (": "..err) or ""; - s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't - end - end - else - has_other = true; - end - end, connect_host, "AAAA", "IN"); - - return true; - elseif host_session.ip_hosts and #host_session.ip_hosts > host_session.ip_choice then -- Not our first attempt, and we also have IPs left to try - s2sout.try_next_ip(host_session); - else - host_session.ip_hosts = nil; - if not s2sout.attempt_connection(host_session, "out of IP addresses") then -- Retry if we can - log("debug", "No other records to try for %s - destroying", host_session.to_host); - err = err and (": "..err) or ""; - s2s_destroy_session(host_session, "Connecting failed"..err); -- End of the line, we can't - return false; - end - end - - return true; -end - -function s2sout.make_connect(host_session, connect_host, connect_port) - (host_session.log or log)("info", "Beginning new connection attempt to %s ([%s]:%d)", host_session.to_host, connect_host.addr, connect_port); - -- Ok, we're going to try to connect - - local from_host, to_host = host_session.from_host, host_session.to_host; - - local conn, handler; - if connect_host.proto == "IPv4" then - conn, handler = socket.tcp(); - else - if not socket.tcp6 then - log("warn", "Could not connect to "..to_host..". Your version of lua-socket does not support IPv6"); - return false, "no-ipv6"; - end - conn, handler = socket.tcp6(); - end - - if not conn then - log("warn", "Failed to create outgoing connection, system error: %s", handler); - return false, handler; - end - - conn:settimeout(0); - local success, err = conn:connect(connect_host.addr, connect_port); - if not success and err ~= "timeout" then - log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host.addr, connect_port, err); - return false, err; - end - - conn = wrapclient(conn, connect_host.addr, connect_port, s2s_listener, "*a"); - host_session.conn = conn; - - local filter = initialize_filters(host_session); - local w, log = conn.write, host_session.log; - host_session.sends2s = function (t) - log("debug", "sending: %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?")); - if t.name then - t = filter("stanzas/out", t); - end - if t then - t = filter("bytes/out", tostring(t)); - if t then - return w(conn, tostring(t)); - end - end - end - - -- Register this outgoing connection so that xmppserver_listener knows about it - -- otherwise it will assume it is a new incoming connection - s2s_listener.register_outgoing(conn, host_session); - - host_session:open_stream(from_host, to_host); - - log("debug", "Connection attempt in progress..."); - return true; -end - -module:hook_global("service-added", function (event) - if event.name ~= "s2s" then return end - - local s2s_sources = portmanager.get_active_services():get("s2s"); - if not s2s_sources then - module:log("warn", "s2s not listening on any ports, outgoing connections may fail"); - return; - end - for source, _ in pairs(s2s_sources) do - if source == "*" or source == "0.0.0.0" then - if not socket.local_addresses then - sources[#sources + 1] = new_ip("0.0.0.0", "IPv4"); - else - for _, addr in ipairs(socket.local_addresses("ipv4", true)) do - sources[#sources + 1] = new_ip(addr, "IPv4"); - end - end - elseif source == "::" then - if not socket.local_addresses then - sources[#sources + 1] = new_ip("::", "IPv6"); - else - for _, addr in ipairs(socket.local_addresses("ipv6", true)) do - sources[#sources + 1] = new_ip(addr, "IPv6"); - end - end - else - sources[#sources + 1] = new_ip(source, (source:find(":") and "IPv6") or "IPv4"); - end - end -end); - -return s2sout; |