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-rw-r--r--plugins/s2s/s2sout.lib.lua352
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;