-- 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.
--
local t_insert, t_remove = table.insert, table.remove;
local coroutine, tostring, pcall = coroutine, tostring, pcall;
-module "adns"
+local function dummy_send(sock, data, i, j) return (j-i)+1; end
+
+local _ENV = nil;
-function lookup(handler, qname, qtype, qclass)
+local function lookup(handler, qname, qtype, qclass)
return coroutine.wrap(function (peek)
if peek then
log("debug", "Records for %s already cached, using those...", qname);
return;
end
log("debug", "Records for %s not in cache, sending query (%s)...", qname, tostring(coroutine.running()));
- dns.query(qname, qtype, qclass);
- coroutine.yield({ qclass or "IN", qtype or "A", qname, coroutine.running()}); -- Wait for reply
- log("debug", "Reply for %s (%s)", qname, tostring(coroutine.running()));
- local ok, err = pcall(handler, dns.peek(qname, qtype, qclass));
+ local ok, err = dns.query(qname, qtype, qclass);
+ if ok then
+ coroutine.yield({ qclass or "IN", qtype or "A", qname, coroutine.running()}); -- Wait for reply
+ log("debug", "Reply for %s (%s)", qname, tostring(coroutine.running()));
+ end
+ if ok then
+ ok, err = pcall(handler, dns.peek(qname, qtype, qclass));
+ else
+ log("error", "Error sending DNS query: %s", err);
+ ok, err = pcall(handler, nil, err);
+ end
if not ok then
log("error", "Error in DNS response handler: %s", tostring(err));
end
end)(dns.peek(qname, qtype, qclass));
end
-function cancel(handle, call_handler)
+local function cancel(handle, call_handler, reason)
log("warn", "Cancelling DNS lookup for %s", tostring(handle[3]));
- dns.cancel(handle);
- if call_handler then
- coroutine.resume(handle[4]);
- end
+ dns.cancel(handle[1], handle[2], handle[3], handle[4], call_handler);
end
-function new_async_socket(sock, resolver)
- local newconn, peername = {}, "<unknown>";
+local function new_async_socket(sock, resolver)
+ local peername = "<unknown>";
local listener = {};
- function listener.incoming(conn, data)
- dns.feed(sock, data);
+ local handler = {};
+ local err;
+ function listener.onincoming(conn, data)
+ if data then
+ dns.feed(handler, data);
+ end
end
- function listener.disconnect(conn, err)
- log("warn", "DNS socket for %s disconnected: %s", peername, err);
- local servers = resolver.server;
- if resolver.socketset[newconn.handler] == resolver.best_server and resolver.best_server == #servers then
- log("error", "Exhausted all %d configured DNS servers, next lookup will try %s again", #servers, servers[1]);
+ function listener.ondisconnect(conn, err)
+ if err then
+ log("warn", "DNS socket for %s disconnected: %s", peername, err);
+ local servers = resolver.server;
+ if resolver.socketset[conn] == resolver.best_server and resolver.best_server == #servers then
+ log("error", "Exhausted all %d configured DNS servers, next lookup will try %s again", #servers, servers[1]);
+ end
+
+ resolver:servfail(conn); -- Let the magic commence
end
-
- resolver:servfail(conn); -- Let the magic commence
end
- newconn.handler, newconn._socket = server.wrapclient(sock, "dns", 53, listener);
- if not newconn.handler then
- log("warn", "handler is nil");
+ handler, err = server.wrapclient(sock, "dns", 53, listener);
+ if not handler then
+ return nil, err;
end
- if not newconn._socket then
- log("warn", "socket is nil");
+
+ handler.settimeout = function () end
+ handler.setsockname = function (_, ...) return sock:setsockname(...); end
+ handler.setpeername = function (_, ...) peername = (...); local ret, err = sock:setpeername(...); _:set_send(dummy_send); return ret, err; end
+ handler.connect = function (_, ...) return sock:connect(...) end
+ --handler.send = function (_, data) _:write(data); return _.sendbuffer and _.sendbuffer(); end
+ handler.send = function (_, data)
+ log("debug", "Sending DNS query to %s", peername);
+ return sock:send(data);
end
- newconn.handler.settimeout = function () end
- newconn.handler.setsockname = function (_, ...) return sock:setsockname(...); end
- newconn.handler.setpeername = function (_, ...) peername = (...); local ret = sock:setpeername(...); _.setsend(sock.send); return ret; end
- newconn.handler.connect = function (_, ...) return sock:connect(...) end
- newconn.handler.send = function (_, data) _.write(data); return _.sendbuffer(); end
- return newconn.handler;
+ return handler;
end
-dns:socket_wrapper_set(new_async_socket);
+dns.socket_wrapper_set(new_async_socket);
-return _M;
+return {
+ lookup = lookup;
+ cancel = cancel;
+ new_async_socket = new_async_socket;
+};