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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// 'Software'), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
var net = require('net');
var util = require('util');
var cares = process.binding('cares_wrap');
var uv = process.binding('uv');
var isIp = net.isIP;
function errnoException(err, syscall, hostname) {
// FIXME(bnoordhuis) Remove this backwards compatibility shite and pass
// the true error to the user. ENOTFOUND is not even a proper POSIX error!
if (err === uv.UV_EAI_MEMORY ||
err === uv.UV_EAI_NODATA ||
err === uv.UV_EAI_NONAME) {
err = 'ENOTFOUND';
}
var ex = null;
if (typeof err === 'string') { // c-ares error code.
ex = new Error(syscall + ' ' + err);
ex.code = err;
ex.errno = err;
ex.syscall = syscall;
} else {
ex = util._errnoException(err, syscall);
}
if (hostname) {
ex.hostname = hostname;
}
return ex;
}
// c-ares invokes a callback either synchronously or asynchronously,
// but the dns API should always invoke a callback asynchronously.
//
// This function makes sure that the callback is invoked asynchronously.
// It returns a function that invokes the callback within nextTick().
//
// To avoid invoking unnecessary nextTick(), `immediately` property of
// returned function should be set to true after c-ares returned.
//
// Usage:
//
// function someAPI(callback) {
// callback = makeAsync(callback);
// channel.someAPI(..., callback);
// callback.immediately = true;
// }
function makeAsync(callback) {
if (!util.isFunction(callback)) {
return callback;
}
return function asyncCallback() {
if (asyncCallback.immediately) {
// The API already returned, we can invoke the callback immediately.
callback.apply(null, arguments);
} else {
var args = arguments;
process.nextTick(function() {
callback.apply(null, args);
});
}
};
}
function onlookup(err, addresses) {
if (err) {
return this.callback(errnoException(err, 'getaddrinfo', this.hostname));
}
if (this.family) {
this.callback(null, addresses[0], this.family);
} else {
this.callback(null, addresses[0], addresses[0].indexOf(':') >= 0 ? 6 : 4);
}
}
// Easy DNS A/AAAA look up
// lookup(hostname, [family,] callback)
exports.lookup = function(hostname, family, callback) {
// parse arguments
if (arguments.length === 2) {
callback = family;
family = 0;
} else if (!family) {
family = 0;
} else {
family = +family;
if (family !== 4 && family !== 6) {
throw new Error('invalid argument: `family` must be 4 or 6');
}
}
callback = makeAsync(callback);
if (!hostname) {
callback(null, null, family === 6 ? 6 : 4);
return {};
}
var matchedFamily = net.isIP(hostname);
if (matchedFamily) {
callback(null, hostname, matchedFamily);
return {};
}
var req = {
callback: callback,
family: family,
hostname: hostname,
oncomplete: onlookup
};
var err = cares.getaddrinfo(req, hostname, family);
if (err) throw errnoException(err, 'getaddrinfo', hostname);
callback.immediately = true;
return req;
};
function onresolve(err, result) {
if (err)
this.callback(errnoException(err, this.bindingName, this.hostname));
else
this.callback(null, result);
}
function resolver(bindingName) {
var binding = cares[bindingName];
return function query(name, callback) {
if (!util.isString(name)) {
throw new Error('Name must be a string');
} else if (!util.isFunction(callback)) {
throw new Error('Callback must be a function');
}
callback = makeAsync(callback);
var req = {
bindingName: bindingName,
callback: callback,
hostname: name,
oncomplete: onresolve
};
var err = binding(req, name);
if (err) throw errnoException(err, bindingName);
callback.immediately = true;
return req;
}
}
var resolveMap = {};
exports.resolve4 = resolveMap.A = resolver('queryA');
exports.resolve6 = resolveMap.AAAA = resolver('queryAaaa');
exports.resolveCname = resolveMap.CNAME = resolver('queryCname');
exports.resolveMx = resolveMap.MX = resolver('queryMx');
exports.resolveNs = resolveMap.NS = resolver('queryNs');
exports.resolveTxt = resolveMap.TXT = resolver('queryTxt');
exports.resolveSrv = resolveMap.SRV = resolver('querySrv');
exports.resolveNaptr = resolveMap.NAPTR = resolver('queryNaptr');
exports.resolveSoa = resolveMap.SOA = resolver('querySoa');
exports.reverse = resolveMap.PTR = resolver('getHostByAddr');
exports.resolve = function(hostname, type_, callback_) {
var resolver, callback;
if (util.isString(type_)) {
resolver = resolveMap[type_];
callback = callback_;
} else if (util.isFunction(type_)) {
resolver = exports.resolve4;
callback = type_;
} else {
throw new Error('Type must be a string');
}
if (util.isFunction(resolver)) {
return resolver(hostname, callback);
} else {
throw new Error('Unknown type "' + type_ + '"');
}
};
exports.getServers = function() {
return cares.getServers();
};
exports.setServers = function(servers) {
// cache the original servers because in the event of an error setting the
// servers cares won't have any servers available for resolution
var orig = cares.getServers();
var newSet = [];
servers.forEach(function(serv) {
var ver = isIp(serv);
if (ver)
return newSet.push([ver, serv]);
var match = serv.match(/\[(.*)\](:\d+)?/);
// we have an IPv6 in brackets
if (match) {
ver = isIp(match[1]);
if (ver)
return newSet.push([ver, match[1]]);
}
var s = serv.split(/:\d+$/)[0];
ver = isIp(s);
if (ver)
return newSet.push([ver, s]);
throw new Error('IP address is not properly formatted: ' + serv);
});
var r = cares.setServers(newSet);
if (r) {
// reset the servers to the old servers, because ares probably unset them
cares.setServers(orig.join(','));
var err = cares.strerror(r);
throw new Error('c-ares failed to set servers: "' + err +
'" [' + servers + ']');
}
};
// ERROR CODES
exports.NODATA = 'ENODATA';
exports.FORMERR = 'EFORMERR';
exports.SERVFAIL = 'ESERVFAIL';
exports.NOTFOUND = 'ENOTFOUND';
exports.NOTIMP = 'ENOTIMP';
exports.REFUSED = 'EREFUSED';
exports.BADQUERY = 'EBADQUERY';
exports.ADNAME = 'EADNAME';
exports.BADFAMILY = 'EBADFAMILY';
exports.BADRESP = 'EBADRESP';
exports.CONNREFUSED = 'ECONNREFUSED';
exports.TIMEOUT = 'ETIMEOUT';
exports.EOF = 'EOF';
exports.FILE = 'EFILE';
exports.NOMEM = 'ENOMEM';
exports.DESTRUCTION = 'EDESTRUCTION';
exports.BADSTR = 'EBADSTR';
exports.BADFLAGS = 'EBADFLAGS';
exports.NONAME = 'ENONAME';
exports.BADHINTS = 'EBADHINTS';
exports.NOTINITIALIZED = 'ENOTINITIALIZED';
exports.LOADIPHLPAPI = 'ELOADIPHLPAPI';
exports.ADDRGETNETWORKPARAMS = 'EADDRGETNETWORKPARAMS';
exports.CANCELLED = 'ECANCELLED';