--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/net/adns.lua Thu Dec 25 10:48:06 2014 +0000
@@ -0,0 +1,91 @@
+-- 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 server = require "net.server";
+local dns = require "net.dns";
+
+local log = require "util.logger".init("adns");
+
+local t_insert, t_remove = table.insert, table.remove;
+local coroutine, tostring, pcall = coroutine, tostring, pcall;
+
+local function dummy_send(sock, data, i, j) return (j-i)+1; end
+
+module "adns"
+
+function lookup(handler, qname, qtype, qclass)
+ return coroutine.wrap(function (peek)
+ if peek then
+ log("debug", "Records for %s already cached, using those...", qname);
+ handler(peek);
+ return;
+ end
+ log("debug", "Records for %s not in cache, sending query (%s)...", qname, tostring(coroutine.running()));
+ 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, reason)
+ log("warn", "Cancelling DNS lookup for %s", tostring(handle[3]));
+ dns.cancel(handle[1], handle[2], handle[3], handle[4], call_handler);
+end
+
+function new_async_socket(sock, resolver)
+ local peername = "<unknown>";
+ local listener = {};
+ local handler = {};
+ local err;
+ function listener.onincoming(conn, data)
+ if data then
+ dns.feed(handler, data);
+ end
+ end
+ 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
+ end
+ handler, err = server.wrapclient(sock, "dns", 53, listener);
+ if not handler then
+ return nil, err;
+ end
+
+ 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
+ return handler;
+end
+
+dns.socket_wrapper_set(new_async_socket);
+
+return _M;