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/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set sts=2 sw=2 et tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const dnssFlags = {
allow_name_collisions: Ci.nsIDNSService.RESOLVE_ALLOW_NAME_COLLISION,
bypass_cache: Ci.nsIDNSService.RESOLVE_BYPASS_CACHE,
canonical_name: Ci.nsIDNSService.RESOLVE_CANONICAL_NAME,
disable_ipv4: Ci.nsIDNSService.RESOLVE_DISABLE_IPV4,
disable_ipv6: Ci.nsIDNSService.RESOLVE_DISABLE_IPV6,
disable_trr: Ci.nsIDNSService.RESOLVE_DISABLE_TRR,
offline: Ci.nsIDNSService.RESOLVE_OFFLINE,
priority_low: Ci.nsIDNSService.RESOLVE_PRIORITY_LOW,
priority_medium: Ci.nsIDNSService.RESOLVE_PRIORITY_MEDIUM,
speculate: Ci.nsIDNSService.RESOLVE_SPECULATE,
};
function getErrorString(nsresult) {
let e = new Components.Exception("", nsresult);
return e.name;
}
this.dns = class extends ExtensionAPI {
getAPI(context) {
return {
dns: {
resolve: function (hostname, flags) {
let dnsFlags = flags.reduce(
(mask, flag) => mask | dnssFlags[flag],
0
);
return new Promise((resolve, reject) => {
let request;
let response = {
addresses: [],
};
let listener = {
onLookupComplete: function (inRequest, inRecord, inStatus) {
if (inRequest === request) {
if (!Components.isSuccessCode(inStatus)) {
return reject({ message: getErrorString(inStatus) });
}
inRecord.QueryInterface(Ci.nsIDNSAddrRecord);
if (dnsFlags & Ci.nsIDNSService.RESOLVE_CANONICAL_NAME) {
try {
response.canonicalName = inRecord.canonicalName;
} catch (e) {
// no canonicalName
}
}
response.isTRR = inRecord.IsTRR();
while (inRecord.hasMore()) {
let addr = inRecord.getNextAddrAsString();
// Sometimes there are duplicate records with the same ip.
if (!response.addresses.includes(addr)) {
response.addresses.push(addr);
}
}
return resolve(response);
}
},
};
try {
request = Services.dns.asyncResolve(
hostname,
Ci.nsIDNSService.RESOLVE_TYPE_DEFAULT,
dnsFlags,
null, // AdditionalInfo
listener,
null,
{} /* defaultOriginAttributes */
);
} catch (e) {
// handle exceptions such as offline mode.
return reject({ message: e.name });
}
});
},
},
};
}
};
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