author | Kim Alvefur <zash@zash.se> |
Sun, 10 Mar 2024 15:56:01 +0100 | |
changeset 13463 | 790f60c0843b |
parent 12978 | ba409c67353b |
permissions | -rw-r--r-- |
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-- Prosody IM |
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-- Copyright (C) 2008-2010 Matthew Wild |
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-- Copyright (C) 2008-2010 Waqas Hussain |
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-- |
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-- This project is MIT/X11 licensed. Please see the |
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-- COPYING file in the source package for more information. |
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-- |
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|
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net: Prefix module imports with prosody namespace
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local server = require "prosody.net.server"; |
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local new_resolver = require "prosody.net.dns".resolver; |
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local promise = require "prosody.util.promise"; |
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|
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local log = require "prosody.util.logger".init("adns"); |
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|
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log("debug", "Using legacy DNS API (missing lua-unbound?)"); -- TODO write docs about luaunbound |
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-- TODO Raise log level once packages are available |
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|
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local coroutine, pcall = coroutine, pcall; |
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local setmetatable = setmetatable; |
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|
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local function dummy_send(sock, data, i, j) return (j-i)+1; end -- luacheck: ignore 212 |
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local _ENV = nil; |
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-- luacheck: std none |
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local async_resolver_methods = {}; |
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local async_resolver_mt = { __index = async_resolver_methods }; |
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local query_methods = {}; |
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local query_mt = { __index = query_methods }; |
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local function new_async_socket(sock, resolver) |
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local peername = "<unknown>"; |
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local listener = {}; |
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local handler = {}; |
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function listener.onincoming(conn, data) -- luacheck: ignore 212/conn |
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if data then |
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resolver:feed(handler, data); |
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end |
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end |
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function listener.ondisconnect(conn, err) |
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if err then |
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log("warn", "DNS socket for %s disconnected: %s", peername, err); |
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local servers = resolver.server; |
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if resolver.socketset[conn] == resolver.best_server and resolver.best_server == #servers then |
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log("warn", "Exhausted all %d configured DNS servers, next lookup will try %s again", #servers, servers[1]); |
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end |
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|
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resolver:servfail(conn); -- Let the magic commence |
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end |
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end |
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do |
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local err; |
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handler, err = server.wrapclient(sock, "dns", 53, listener); |
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if not handler then |
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return nil, err; |
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end |
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end |
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if handler.set then |
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-- server_epoll: only watch for incoming data |
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-- avoids sending empty packet on first 'onwritable' event |
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handler:set(true, false); |
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end |
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|
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handler.settimeout = function () end |
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handler.setsockname = function (_, ...) return sock:setsockname(...); end |
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handler.setpeername = function (_, ...) peername = (...); local ret, err = sock:setpeername(...); _:set_send(dummy_send); return ret, err; end |
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handler.connect = function (_, ...) return sock:connect(...) end |
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--handler.send = function (_, data) _:write(data); return _.sendbuffer and _.sendbuffer(); end |
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handler.send = function (_, data) |
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log("debug", "Sending DNS query to %s", peername); |
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return sock:send(data); |
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end |
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return handler; |
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end |
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|
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function async_resolver_methods:lookup(handler, qname, qtype, qclass) |
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local resolver = self._resolver; |
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return coroutine.wrap(function (peek) |
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if peek then |
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81 |
log("debug", "Records for %s already cached, using those...", qname); |
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handler(peek); |
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83 |
return; |
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84 |
end |
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85 |
log("debug", "Records for %s not in cache, sending query (%s)...", qname, coroutine.running()); |
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86 |
local ok, err = resolver:query(qname, qtype, qclass); |
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87 |
if ok then |
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88 |
coroutine.yield(setmetatable({ resolver, qclass or "IN", qtype or "A", qname, coroutine.running()}, query_mt)); -- Wait for reply |
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89 |
log("debug", "Reply for %s (%s)", qname, coroutine.running()); |
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90 |
end |
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91 |
if ok then |
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92 |
ok, err = pcall(handler, resolver:peek(qname, qtype, qclass)); |
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93 |
else |
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94 |
log("error", "Error sending DNS query: %s", err); |
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95 |
ok, err = pcall(handler, nil, err); |
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96 |
end |
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if not ok then |
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98 |
log("error", "Error in DNS response handler: %s", err); |
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99 |
end |
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100 |
end)(resolver:peek(qname, qtype, qclass)); |
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101 |
end |
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102 |
|
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103 |
function async_resolver_methods:lookup_promise(qname, qtype, qclass) |
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104 |
return promise.new(function (resolve, reject) |
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105 |
local function handler(answer) |
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106 |
if not answer then |
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107 |
return reject(); |
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108 |
end |
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109 |
resolve(answer); |
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110 |
end |
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111 |
self:lookup(handler, qname, qtype, qclass); |
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112 |
end); |
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113 |
end |
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114 |
|
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115 |
function query_methods:cancel(call_handler, reason) -- luacheck: ignore 212/reason |
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log("warn", "Cancelling DNS lookup for %s", self[4]); |
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self[1].cancel(self[2], self[3], self[4], self[5], call_handler); |
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118 |
end |
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119 |
|
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120 |
local function new_async_resolver() |
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121 |
local resolver = new_resolver(); |
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122 |
resolver:socket_wrapper_set(new_async_socket); |
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123 |
return setmetatable({ _resolver = resolver}, async_resolver_mt); |
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124 |
end |
872 | 125 |
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126 |
return { |
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127 |
lookup = function (...) |
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128 |
return new_async_resolver():lookup(...); |
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129 |
end; |
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130 |
resolver = new_async_resolver; |
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new_async_socket = new_async_socket; |
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132 |
}; |