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const {
ArrayPrototypeForEach,
ArrayPrototypeJoin,
ArrayPrototypeMap,
ArrayPrototypePush,
FunctionPrototypeBind,
NumberParseInt,
StringPrototypeMatch,
StringPrototypeReplace,
} = primordials;
const errors = require('internal/errors');
const { isIP } = require('internal/net');
const { getOptionValue } = require('internal/options');
const {
validateArray,
validateInt32,
validateOneOf,
validateString,
} = require('internal/validators');
const {
ChannelWrap,
strerror,
AI_ADDRCONFIG,
AI_ALL,
AI_V4MAPPED,
} = internalBinding('cares_wrap');
const IANA_DNS_PORT = 53;
const IPv6RE = /^\[([^[\]]*)\]/;
const addrSplitRE = /(^.+?)(?::(\d+))?$/;
const {
ERR_DNS_SET_SERVERS_FAILED,
ERR_INVALID_ARG_VALUE,
ERR_INVALID_IP_ADDRESS,
} = errors.codes;
function validateTimeout(options) {
const { timeout = -1 } = { ...options };
validateInt32(timeout, 'options.timeout', -1);
return timeout;
}
function validateTries(options) {
const { tries = 4 } = { ...options };
validateInt32(tries, 'options.tries', 1);
return tries;
}
// Resolver instances correspond 1:1 to c-ares channels.
class Resolver {
constructor(options = undefined) {
const timeout = validateTimeout(options);
const tries = validateTries(options);
this._handle = new ChannelWrap(timeout, tries);
}
cancel() {
this._handle.cancel();
}
getServers() {
return ArrayPrototypeMap(this._handle.getServers(), (val) => {
if (!val[1] || val[1] === IANA_DNS_PORT)
return val[0];
const host = isIP(val[0]) === 6 ? `[${val[0]}]` : val[0];
return `${host}:${val[1]}`;
});
}
setServers(servers) {
validateArray(servers, 'servers');
// Cache the original servers because in the event of an error while
// setting the servers, c-ares won't have any servers available for
// resolution.
const orig = this._handle.getServers();
const newSet = [];
ArrayPrototypeForEach(servers, (serv, index) => {
validateString(serv, `servers[${index}]`);
let ipVersion = isIP(serv);
if (ipVersion !== 0)
return ArrayPrototypePush(newSet, [ipVersion, serv, IANA_DNS_PORT]);
const match = StringPrototypeMatch(serv, IPv6RE);
// Check for an IPv6 in brackets.
if (match) {
ipVersion = isIP(match[1]);
if (ipVersion !== 0) {
const port = NumberParseInt(
StringPrototypeReplace(serv, addrSplitRE, '$2')) || IANA_DNS_PORT;
return ArrayPrototypePush(newSet, [ipVersion, match[1], port]);
}
}
// addr::port
const addrSplitMatch = StringPrototypeMatch(serv, addrSplitRE);
if (addrSplitMatch) {
const hostIP = addrSplitMatch[1];
const port = addrSplitMatch[2] || IANA_DNS_PORT;
ipVersion = isIP(hostIP);
if (ipVersion !== 0) {
return ArrayPrototypePush(
newSet, [ipVersion, hostIP, NumberParseInt(port)]);
}
}
throw new ERR_INVALID_IP_ADDRESS(serv);
});
const errorNumber = this._handle.setServers(newSet);
if (errorNumber !== 0) {
// Reset the servers to the old servers, because ares probably unset them.
this._handle.setServers(ArrayPrototypeJoin(orig, ','));
const err = strerror(errorNumber);
throw new ERR_DNS_SET_SERVERS_FAILED(err, servers);
}
}
setLocalAddress(ipv4, ipv6) {
validateString(ipv4, 'ipv4');
if (ipv6 !== undefined) {
validateString(ipv6, 'ipv6');
}
this._handle.setLocalAddress(ipv4, ipv6);
}
}
let defaultResolver = new Resolver();
const resolverKeys = [
'getServers',
'resolve',
'resolve4',
'resolve6',
'resolveAny',
'resolveCaa',
'resolveCname',
'resolveMx',
'resolveNaptr',
'resolveNs',
'resolvePtr',
'resolveSoa',
'resolveSrv',
'resolveTxt',
'reverse',
];
function getDefaultResolver() {
return defaultResolver;
}
function setDefaultResolver(resolver) {
defaultResolver = resolver;
}
function bindDefaultResolver(target, source) {
ArrayPrototypeForEach(resolverKeys, (key) => {
target[key] = FunctionPrototypeBind(source[key], defaultResolver);
});
}
function validateHints(hints) {
if ((hints & ~(AI_ADDRCONFIG | AI_ALL | AI_V4MAPPED)) !== 0) {
throw new ERR_INVALID_ARG_VALUE('hints', hints);
}
}
let invalidHostnameWarningEmitted = false;
function emitInvalidHostnameWarning(hostname) {
if (!invalidHostnameWarningEmitted) {
process.emitWarning(
`The provided hostname "${hostname}" is not a valid ` +
'hostname, and is supported in the dns module solely for compatibility.',
'DeprecationWarning',
'DEP0118'
);
invalidHostnameWarningEmitted = true;
}
}
let dnsOrder = getOptionValue('--dns-result-order') || 'verbatim';
function getDefaultVerbatim() {
return dnsOrder !== 'ipv4first';
}
function setDefaultResultOrder(value) {
validateOneOf(value, 'dnsOrder', ['verbatim', 'ipv4first']);
dnsOrder = value;
}
module.exports = {
bindDefaultResolver,
getDefaultResolver,
setDefaultResolver,
validateHints,
validateTimeout,
validateTries,
Resolver,
emitInvalidHostnameWarning,
getDefaultVerbatim,
setDefaultResultOrder,
};
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