/usr/lib/prosody/net/adns.lua is in prosody 0.9.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- 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 = {};
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 = sock:setpeername(...); _:set_send(dummy_send); return ret; end
handler.connect = function (_, ...) return sock:connect(...) end
--handler.send = function (_, data) _:write(data); return _.sendbuffer and _.sendbuffer(); end
handler.send = function (_, data)
local getpeername = sock.getpeername;
log("debug", "Sending DNS query to %s", (getpeername and getpeername(sock)) or "<unconnected>");
return sock:send(data);
end
return handler;
end
dns.socket_wrapper_set(new_async_socket);
return _M;
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