whois.go

/*
 * Copyright 2014-2019 Li Kexian
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Go module for domain and ip whois info query
 * https://www.likexian.com/
 */

package whois

import (
	"errors"
	"fmt"
	"io/ioutil"
	"net"
	"strings"
	"time"
)

var (
	whoisRoot = map[string]string{
		"aaa":                      "whois.nic.aaa",
		"aarp":                     "whois.nic.aarp",
		"abb":                      "whois.nic.abb",
		"abbott":                   "whois.afilias-srs.net",
		"abogado":                  "whois-dub.mm-registry.com",
		"ac":                       "whois.nic.ac",
		"academy":                  "whois.donuts.co",
		"accenture":                "whois.nic.accenture",
		"accountant":               "whois.nic.accountant",
		"accountants":              "whois.donuts.co",
		"aco":                      "whois.afilias-srs.net",
		"active":                   "whois.afilias-srs.net",
		"actor":                    "whois.unitedtld.com",
		"ads":                      "domain-registry-whois.l.google.com",
		"adult":                    "whois.afilias-srs.net",
		"ae":                       "whois.aeda.net.ae",
		"aeg":                      "whois.nic.aeg",
		"aero":                     "whois.aero",
		"af":                       "whois.nic.af",
		"afl":                      "whois.nic.afl",
		"ag":                       "whois.nic.ag",
		"agency":                   "whois.donuts.co",
		"ai":                       "whois.ai",
		"aig":                      "whois.nic.aig",
		"airforce":                 "whois.unitedtld.com",
		"airtel":                   "whois.nic.airtel",
		"allfinanz":                "whois.ksregistry.net",
		"alsace":                   "whois-alsace.nic.fr",
		"am":                       "whois.amnic.net",
		"amica":                    "whois.nic.amica",
		"amsterdam":                "whois.nic.amsterdam",
		"android":                  "domain-registry-whois.l.google.com",
		"apartments":               "whois.donuts.co",
		"app":                      "whois.nic.google",
		"apple":                    "whois.afilias-srs.net",
		"aquarelle":                "whois-aquarelle.nic.fr",
		"aramco":                   "whois.nic.aramco",
		"archi":                    "whois.ksregistry.net",
		"army":                     "whois.rightside.co",
		"arpa":                     "whois.iana.org",
		"arte":                     "whois.nic.arte",
		"as":                       "whois.nic.as",
		"asia":                     "whois.nic.asia",
		"associates":               "whois.donuts.co",
		"at":                       "whois.nic.at",
		"attorney":                 "whois.rightside.co",
		"au":                       "whois.audns.net.au",
		"auction":                  "whois.donuts.co",
		"audi":                     "whois.afilias-srs.net",
		"audio":                    "whois.uniregistry.net",
		"author":                   "whois.nic.author",
		"auto":                     "whois.uniregistry.net",
		"autos":                    "whois.afilias-srs.net",
		"aw":                       "whois.nic.aw",
		"ax":                       "whois.ax",
		"axa":                      "whois.nic.axa",
		"azure":                    "whois.nic.azure",
		"band":                     "whois.rightside.co",
		"bank":                     "whois.nic.bank",
		"bar":                      "whois.nic.bar",
		"barcelona":                "whois.nic.barcelona",
		"barclaycard":              "whois.nic.barclaycard",
		"barclays":                 "whois.nic.barclays",
		"bargains":                 "whois.donuts.co",
		"bauhaus":                  "whois.nic.bauhaus",
		"bayern":                   "whois-dub.mm-registry.com",
		"bbc":                      "whois.nic.bbc",
		"bbva":                     "whois.nic.bbva",
		"bcn":                      "whois.nic.bcn",
		"be":                       "whois.dns.be",
		"beats":                    "whois.afilias-srs.net",
		"beer":                     "whois-dub.mm-registry.com",
		"bentley":                  "whois.nic.bentley",
		"berlin":                   "whois.nic.berlin",
		"best":                     "whois.nic.best",
		"bet":                      "whois.afilias.net",
		"bg":                       "whois.register.bg",
		"bharti":                   "whois.nic.bharti",
		"bi":                       "whois1.nic.bi",
		"bible":                    "whois.nic.bible",
		"bid":                      "whois.nic.bid",
		"bike":                     "whois.donuts.co",
		"bing":                     "whois.nic.bing",
		"bingo":                    "whois.donuts.co",
		"bio":                      "whois.ksregistry.net",
		"biz":                      "whois.biz",
		"bj":                       "whois.nic.bj",
		"black":                    "whois.afilias.net",
		"blackfriday":              "whois.uniregistry.net",
		"bloomberg":                "whois.nic.bloomberg",
		"blue":                     "whois.afilias.net",
		"bms":                      "whois.nic.bms",
		"bmw":                      "whois.ksregistry.net",
		"bn":                       "whois.bn",
		"bnl":                      "whois.afilias-srs.net",
		"bnpparibas":               "whois.afilias-srs.net",
		"bo":                       "whois.nic.bo",
		"boats":                    "whois.afilias-srs.net",
		"boehringer":               "whois.afilias-srs.net",
		"bom":                      "whois.gtlds.nic.br",
		"bond":                     "whois.nic.bond",
		"boo":                      "domain-registry-whois.l.google.com",
		"book":                     "whois.nic.book",
		"boots":                    "whois.nic.boots",
		"bostik":                   "whois-bostik.nic.fr",
		"bot":                      "whois.nic.bot",
		"boutique":                 "whois.donuts.co",
		"br":                       "whois.registro.br",
		"bradesco":                 "whois-cl01.mm-registry.com",
		"bridgestone":              "whois.nic.bridgestone",
		"broadway":                 "whois-cl01.mm-registry.com",
		"broker":                   "whois.nic.broker",
		"brother":                  "whois.nic.brother",
		"brussels":                 "whois.brussels.tld-box.at",
		"budapest":                 "whois-dub.mm-registry.com",
		"bugatti":                  "whois.afilias-srs.net",
		"build":                    "whois.build.aridnrs.net.au",
		"builders":                 "whois.donuts.co",
		"business":                 "whois.donuts.co",
		"buy":                      "whois.afilias-srs.net",
		"buzz":                     "whois.nic.buzz",
		"bw":                       "whois.nic.net.bw",
		"by":                       "whois.cctld.by",
		"bzh":                      "whois-bzh.nic.fr",
		"ca":                       "whois.cira.ca",
		"cab":                      "whois.donuts.co",
		"cafe":                     "whois.donuts.co",
		"cal":                      "domain-registry-whois.l.google.com",
		"call":                     "whois.nic.call",
		"camera":                   "whois.donuts.co",
		"camp":                     "whois.donuts.co",
		"cancerresearch":           "whois.nic.cancerresearch",
		"canon":                    "whois.nic.gmo",
		"capetown":                 "capetown-whois.registry.net.za",
		"capital":                  "whois.donuts.co",
		"car":                      "whois.uniregistry.net",
		"caravan":                  "whois.nic.caravan",
		"cards":                    "whois.donuts.co",
		"care":                     "whois.donuts.co",
		"career":                   "whois.nic.career",
		"careers":                  "whois.donuts.co",
		"cars":                     "whois.uniregistry.net",
		"cartier":                  "whois.nic.cartier",
		"casa":                     "whois-dub.mm-registry.com",
		"cash":                     "whois.donuts.co",
		"casino":                   "whois.donuts.co",
		"cat":                      "whois.cat",
		"catering":                 "whois.donuts.co",
		"cba":                      "whois.nic.cba",
		"cbn":                      "whois.nic.cbn",
		"cc":                       "ccwhois.verisign-grs.com",
		"cd":                       "whois.nic.cd",
		"ceb":                      "whois.afilias-srs.net",
		"center":                   "whois.donuts.co",
		"ceo":                      "whois.nic.ceo",
		"cern":                     "whois.afilias-srs.net",
		"cf":                       "whois.dot.cf",
		"cfa":                      "whois.nic.cfa",
		"cfd":                      "whois.nic.cfd",
		"ch":                       "whois.nic.ch",
		"chanel":                   "whois.nic.chanel",
		"channel":                  "domain-registry-whois.l.google.com",
		"chat":                     "whois.donuts.co",
		"cheap":                    "whois.donuts.co",
		"chloe":                    "whois.nic.chloe",
		"christmas":                "whois.uniregistry.net",
		"chrome":                   "domain-registry-whois.l.google.com",
		"church":                   "whois.donuts.co",
		"ci":                       "whois.nic.ci",
		"cipriani":                 "whois.afilias-srs.net",
		"circle":                   "whois.nic.circle",
		"cisco":                    "whois.nic.cisco",
		"citic":                    "whois.nic.citic",
		"city":                     "whois.donuts.co",
		"cityeats":                 "whois.nic.cityeats",
		"cl":                       "whois.nic.cl",
		"claims":                   "whois.donuts.co",
		"cleaning":                 "whois.donuts.co",
		"click":                    "whois.uniregistry.net",
		"clinic":                   "whois.donuts.co",
		"clothing":                 "whois.donuts.co",
		"cloud":                    "whois.nic.cloud",
		"club":                     "whois.nic.club",
		"clubmed":                  "whois.nic.clubmed",
		"cn":                       "whois.cnnic.cn",
		"co":                       "whois.nic.co",
		"coach":                    "whois.donuts.co",
		"codes":                    "whois.donuts.co",
		"coffee":                   "whois.donuts.co",
		"college":                  "whois.centralnic.com",
		"cologne":                  "whois-fe1.pdt.cologne.tango.knipp.de",
		"com":                      "whois.verisign-grs.com",
		"commbank":                 "whois.nic.commbank",
		"community":                "whois.donuts.co",
		"company":                  "whois.donuts.co",
		"computer":                 "whois.donuts.co",
		"comsec":                   "whois.nic.comsec",
		"condos":                   "whois.donuts.co",
		"construction":             "whois.donuts.co",
		"consulting":               "whois.unitedtld.com",
		"contractors":              "whois.donuts.co",
		"cooking":                  "whois-dub.mm-registry.com",
		"cool":                     "whois.donuts.co",
		"coop":                     "whois.nic.coop",
		"corsica":                  "whois-corsica.nic.fr",
		"country":                  "whois-dub.mm-registry.com",
		"coupons":                  "whois.donuts.co",
		"courses":                  "whois.aridnrs.net.au",
		"cr":                       "whois.nic.cr",
		"credit":                   "whois.donuts.co",
		"creditcard":               "whois.donuts.co",
		"creditunion":              "whois.afilias-srs.net",
		"cricket":                  "whois.nic.cricket",
		"crown":                    "whois.nic.crown",
		"crs":                      "whois.nic.crs",
		"cruises":                  "whois.donuts.co",
		"csc":                      "whois.nic.csc",
		"cuisinella":               "whois.nic.cuisinella",
		"cx":                       "whois.nic.cx",
		"cymru":                    "whois.nic.cymru",
		"cyou":                     "whois.afilias-srs.net",
		"cz":                       "whois.nic.cz",
		"dabur":                    "whois.afilias-srs.net",
		"dad":                      "domain-registry-whois.l.google.com",
		"dance":                    "whois.unitedtld.com",
		"date":                     "whois.nic.date",
		"dating":                   "whois.donuts.co",
		"datsun":                   "whois.nic.gmo",
		"day":                      "domain-registry-whois.l.google.com",
		"dclk":                     "domain-registry-whois.l.google.com",
		"de":                       "whois.denic.de",
		"deals":                    "whois.donuts.co",
		"degree":                   "whois.rightside.co",
		"delivery":                 "whois.donuts.co",
		"dell":                     "whois.nic.dell",
		"delta":                    "whois.afilias-srs.net",
		"democrat":                 "whois.unitedtld.com",
		"dental":                   "whois.donuts.co",
		"dentist":                  "whois.rightside.co",
		"desi":                     "whois.ksregistry.net",
		"design":                   "whois.centralnic.com",
		"dev":                      "domain-registry-whois.l.google.com",
		"diamonds":                 "whois.donuts.co",
		"diet":                     "whois.uniregistry.net",
		"digital":                  "whois.donuts.co",
		"direct":                   "whois.donuts.co",
		"directory":                "whois.donuts.co",
		"discount":                 "whois.donuts.co",
		"dk":                       "whois.dk-hostmaster.dk",
		"dm":                       "whois.nic.dm",
		"dnp":                      "whois.nic.dnp",
		"docs":                     "domain-registry-whois.l.google.com",
		"dog":                      "whois.donuts.co",
		"doha":                     "whois.nic.doha",
		"domains":                  "whois.donuts.co",
		"doosan":                   "whois.nic.doosan",
		"download":                 "whois.nic.download",
		"drive":                    "whois.nic.google",
		"durban":                   "durban-whois.registry.net.za",
		"dvag":                     "whois.ksregistry.net",
		"dz":                       "whois.nic.dz",
		"earth":                    "whois.nic.earth",
		"eat":                      "domain-registry-whois.l.google.com",
		"ec":                       "whois.nic.ec",
		"edu":                      "whois.educause.edu",
		"education":                "whois.donuts.co",
		"ee":                       "whois.tld.ee",
		"email":                    "whois.donuts.co",
		"emerck":                   "whois.afilias-srs.net",
		"energy":                   "whois.donuts.co",
		"engineer":                 "whois.rightside.co",
		"engineering":              "whois.donuts.co",
		"enterprises":              "whois.donuts.co",
		"epson":                    "whois.aridnrs.net.au",
		"equipment":                "whois.donuts.co",
		"erni":                     "whois.nic.erni",
		"es":                       "whois.nic.es",
		"esq":                      "domain-registry-whois.l.google.com",
		"estate":                   "whois.donuts.co",
		"eu":                       "whois.eu",
		"eurovision":               "whois.nic.eurovision",
		"eus":                      "whois.eus.coreregistry.net",
		"events":                   "whois.donuts.co",
		"everbank":                 "whois.nic.everbank",
		"exchange":                 "whois.donuts.co",
		"expert":                   "whois.donuts.co",
		"exposed":                  "whois.donuts.co",
		"express":                  "whois.donuts.co",
		"fage":                     "whois.afilias-srs.net",
		"fail":                     "whois.donuts.co",
		"fairwinds":                "whois.nic.fairwinds",
		"faith":                    "whois.nic.faith",
		"family":                   "whois.rightside.co",
		"fan":                      "whois.centralnic.com",
		"fans":                     "whois.centralnic.com",
		"farm":                     "whois.donuts.co",
		"fashion":                  "whois-dub.mm-registry.com",
		"fast":                     "whois.nic.fast",
		"feedback":                 "whois.centralnic.com",
		"ferrero":                  "whois.nic.ferrero",
		"fi":                       "whois.ficora.fi",
		"film":                     "whois.nic.film",
		"final":                    "whois.gtlds.nic.br",
		"finance":                  "whois.donuts.co",
		"financial":                "whois.donuts.co",
		"firestone":                "whois.nic.firestone",
		"firmdale":                 "whois.nic.firmdale",
		"fish":                     "whois.donuts.co",
		"fishing":                  "whois-dub.mm-registry.com",
		"fit":                      "whois-dub.mm-registry.com",
		"fitness":                  "whois.donuts.co",
		"fj":                       "whois.fj",
		"flights":                  "whois.donuts.co",
		"florist":                  "whois.donuts.co",
		"flowers":                  "whois.uniregistry.net",
		"flsmidth":                 "whois.ksregistry.net",
		"fly":                      "domain-registry-whois.l.google.com",
		"fm":                       "whois.nic.fm",
		"fo":                       "whois.nic.fo",
		"foo":                      "domain-registry-whois.l.google.com",
		"football":                 "whois.donuts.co",
		"forex":                    "whois.nic.forex",
		"forsale":                  "whois.unitedtld.com",
		"forum":                    "whois.centralnic.com",
		"foundation":               "whois.donuts.co",
		"fr":                       "whois.nic.fr",
		"frl":                      "whois.nic.frl",
		"frogans":                  "whois-frogans.nic.fr",
		"fund":                     "whois.donuts.co",
		"furniture":                "whois.donuts.co",
		"futbol":                   "whois.unitedtld.com",
		"fyi":                      "whois.donuts.co",
		"gal":                      "whois.gal.coreregistry.net",
		"gallery":                  "whois.donuts.co",
		"game":                     "whois.uniregistry.net",
		"garden":                   "whois-dub.mm-registry.com",
		"gbiz":                     "domain-registry-whois.l.google.com",
		"gd":                       "whois.adamsnames.com",
		"gdn":                      "whois.gdnregistry.com",
		"gea":                      "whois.afilias-srs.net",
		"gent":                     "whois.nic.gent",
		"genting":                  "whois.nic.genting",
		"gg":                       "whois.gg",
		"ggee":                     "whois.nic.gmo",
		"gh":                       "whois.nic.gh",
		"gi":                       "whois2.afilias-grs.net",
		"gift":                     "whois.uniregistry.net",
		"gifts":                    "whois.donuts.co",
		"gives":                    "whois.rightside.co",
		"giving":                   "whois.nic.giving",
		"gl":                       "whois.nic.gl",
		"glass":                    "whois.donuts.co",
		"gle":                      "domain-registry-whois.l.google.com",
		"global":                   "whois.afilias-srs.net",
		"globo":                    "whois.gtlds.nic.br",
		"gmail":                    "domain-registry-whois.l.google.com",
		"gmo":                      "whois.nic.gmo",
		"gmx":                      "whois-fe1.gmx.tango.knipp.de",
		"gold":                     "whois.donuts.co",
		"goldpoint":                "whois.nic.gmo",
		"golf":                     "whois.donuts.co",
		"goo":                      "whois.nic.gmo",
		"goog":                     "domain-registry-whois.l.google.com",
		"google":                   "domain-registry-whois.l.google.com",
		"gop":                      "whois-cl01.mm-registry.com",
		"got":                      "whois.nic.got",
		"gov":                      "whois.dotgov.gov",
		"gq":                       "whois.dominio.gq",
		"grainger":                 "whois.nic.grainger",
		"graphics":                 "whois.donuts.co",
		"gratis":                   "whois.donuts.co",
		"green":                    "whois.afilias.net",
		"gripe":                    "whois.donuts.co",
		"group":                    "whois.donuts.co",
		"gs":                       "whois.nic.gs",
		"gucci":                    "whois.nic.gucci",
		"guge":                     "domain-registry-whois.l.google.com",
		"guide":                    "whois.donuts.co",
		"guitars":                  "whois.uniregistry.net",
		"guru":                     "whois.donuts.co",
		"gy":                       "whois.registry.gy",
		"hamburg":                  "whois.hamburg.tld-box.at",
		"hangout":                  "domain-registry-whois.l.google.com",
		"haus":                     "whois.unitedtld.com",
		"healthcare":               "whois.donuts.co",
		"help":                     "whois.uniregistry.net",
		"here":                     "domain-registry-whois.l.google.com",
		"hermes":                   "whois.afilias-srs.net",
		"hiphop":                   "whois.uniregistry.net",
		"hitachi":                  "whois.nic.gmo",
		"hiv":                      "whois.afilias-srs.net",
		"hk":                       "whois.hkirc.hk",
		"hm":                       "whois.registry.hm",
		"hn":                       "whois2.afilias-grs.net",
		"hockey":                   "whois.donuts.co",
		"holdings":                 "whois.donuts.co",
		"holiday":                  "whois.donuts.co",
		"homedepot":                "whois.afilias-srs.net",
		"homes":                    "whois.afilias-srs.net",
		"honda":                    "whois.nic.honda",
		"horse":                    "whois-dub.mm-registry.com",
		"host":                     "whois.centralnic.com",
		"hosting":                  "whois.uniregistry.net",
		"hoteles":                  "whois.nic.hoteles",
		"hotmail":                  "whois.nic.hotmail",
		"house":                    "whois.donuts.co",
		"how":                      "domain-registry-whois.l.google.com",
		"hr":                       "whois.dns.hr",
		"hsbc":                     "whois.nic.hsbc",
		"ht":                       "whois.nic.ht",
		"hu":                       "whois.nic.hu",
		"hyundai":                  "whois.nic.hyundai",
		"ibm":                      "whois.nic.ibm",
		"icbc":                     "whois.afilias-srs.net",
		"ice":                      "whois.nic.ice",
		"icu":                      "whois.nic.icu",
		"id":                       "whois.pandi.or.id",
		"ie":                       "whois.domainregistry.ie",
		"ifm":                      "whois.nic.ifm",
		"iinet":                    "whois.aridnrs.net.au",
		"il":                       "whois.isoc.org.il",
		"im":                       "whois.nic.im",
		"immo":                     "whois.donuts.co",
		"immobilien":               "whois.unitedtld.com",
		"in":                       "whois.inregistry.net",
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		"training":                 "whois.donuts.co",
		"travel":                   "whois.nic.travel",
		"travelers":                "whois.afilias-srs.net",
		"trust":                    "whois.nic.trust",
		"tui":                      "whois.ksregistry.net",
		"tv":                       "tvwhois.verisign-grs.com",
		"tw":                       "whois.twnic.net.tw",
		"tz":                       "whois.tznic.or.tz",
		"ua":                       "whois.ua",
		"ubs":                      "whois.nic.ubs",
		"ug":                       "whois.co.ug",
		"uk":                       "whois.nic.uk",
		"university":               "whois.donuts.co",
		"uno":                      "whois.nic.uno",
		"uol":                      "whois.gtlds.nic.br",
		"us":                       "whois.nic.us",
		"uy":                       "whois.nic.org.uy",
		"uz":                       "whois.cctld.uz",
		"vacations":                "whois.donuts.co",
		"vana":                     "whois.nic.vana",
		"vc":                       "whois2.afilias-grs.net",
		"ve":                       "whois.nic.ve",
		"vegas":                    "whois.afilias-srs.net",
		"ventures":                 "whois.donuts.co",
		"verisign":                 "whois.nic.verisign",
		"versicherung":             "whois.versicherung.tld-box.at",
		"vet":                      "whois.rightside.co",
		"vg":                       "whois.adamsnames.tc",
		"viajes":                   "whois.donuts.co",
		"video":                    "whois.rightside.co",
		"villas":                   "whois.donuts.co",
		"vin":                      "whois.donuts.co",
		"vip":                      "whois-dub.mm-registry.com",
		"virgin":                   "whois.nic.virgin",
		"vision":                   "whois.donuts.co",
		"vista":                    "whois.nic.vista",
		"vistaprint":               "whois.nic.vistaprint",
		"viva":                     "whois.centralnic.com",
		"vlaanderen":               "whois.vlaanderen.tld-box.at",
		"vodka":                    "whois-dub.mm-registry.com",
		"vote":                     "whois.afilias.net",
		"voting":                   "whois.voting.tld-box.at",
		"voto":                     "whois.afilias.net",
		"voyage":                   "whois.donuts.co",
		"vu":                       "vunic.vu",
		"wales":                    "whois.nic.wales",
		"walter":                   "whois.nic.walter",
		"wang":                     "whois.gtld.knet.cn",
		"watch":                    "whois.donuts.co",
		"webcam":                   "whois.nic.webcam",
		"website":                  "whois.centralnic.com",
		"wed":                      "whois.coccaregistry.org",
		"wedding":                  "whois-dub.mm-registry.com",
		"weir":                     "whois.nic.weir",
		"wf":                       "whois.nic.wf",
		"whoswho":                  "whois.nic.whoswho",
		"wien":                     "whois.nic.wien",
		"wiki":                     "whois.nic.wiki",
		"williamhill":              "whois.nic.williamhill",
		"win":                      "whois.nic.win",
		"windows":                  "whois.nic.windows",
		"wine":                     "whois.donuts.co",
		"wme":                      "whois.centralnic.com",
		"work":                     "whois-dub.mm-registry.com",
		"works":                    "whois.donuts.co",
		"world":                    "whois.donuts.co",
		"ws":                       "whois.website.ws",
		"wtc":                      "whois.nic.wtc",
		"wtf":                      "whois.donuts.co",
		"xbox":                     "whois.nic.xbox",
		"xerox":                    "whois.nic.xerox",
		"xin":                      "whois.afilias-srs.net",
		"xn--11b4c3d":              "whois.nic.xn--11b4c3d",
		"xn--1qqw23a":              "whois.ngtld.cn",
		"xn--30rr7y":               "whois.nic.wang",
		"xn--3bst00m":              "whois.gtld.knet.cn",
		"xn--3ds443g":              "whois.afilias-srs.net",
		"xn--3e0b707e":             "whois.kr",
		"xn--3pxu8k":               "whois.nic.xn--3pxu8k",
		"xn--42c2d9a":              "whois.nic.xn--42c2d9a",
		"xn--45q11c":               "whois.nic.xn--45q11c",
		"xn--4gbrim":               "whois.afilias-srs.net",
		"xn--55qw42g":              "whois.conac.cn",
		"xn--55qx5d":               "whois.ngtld.cn",
		"xn--6frz82g":              "whois.afilias.net",
		"xn--6qq986b3xl":           "whois.gtld.knet.cn",
		"xn--80adxhks":             "whois.nic.xn--80adxhks",
		"xn--80ao21a":              "whois.nic.kz",
		"xn--80asehdb":             "whois.online.rs.corenic.net",
		"xn--80aswg":               "whois.site.rs.corenic.net",
		"xn--90a3ac":               "whois.rnids.rs",
		"xn--90ais":                "whois.cctld.by",
		"xn--9dbq2a":               "whois.nic.xn--9dbq2a",
		"xn--9et52u":               "whois.nic.wang",
		"xn--b4w605ferd":           "whois.afilias-srs.net",
		"xn--c1avg":                "whois.publicinterestregistry.net",
		"xn--c2br7g":               "whois.nic.xn--c2br7g",
		"xn--cg4bki":               "whois.kr",
		"xn--clchc0ea0b2g2a9gcd":   "whois.sgnic.sg",
		"xn--czr694b":              "whois.nic.xn--czr694b",
		"xn--czrs0t":               "whois.donuts.co",
		"xn--czru2d":               "whois.gtld.knet.cn",
		"xn--d1acj3b":              "whois.nic.xn--d1acj3b",
		"xn--d1alf":                "whois.marnet.mk",
		"xn--efvy88h":              "whois.nic.xn--efvy88h",
		"xn--estv75g":              "whois.afilias-srs.net",
		"xn--fhbei":                "whois.nic.xn--fhbei",
		"xn--fiq228c5hs":           "whois.afilias-srs.net",
		"xn--fiq64b":               "whois.gtld.knet.cn",
		"xn--fiqs8s":               "cwhois.cnnic.cn",
		"xn--fiqz9s":               "cwhois.cnnic.cn",
		"xn--fjq720a":              "whois.donuts.co",
		"xn--flw351e":              "domain-registry-whois.l.google.com",
		"xn--hxt814e":              "whois.nic.xn--hxt814e",
		"xn--i1b6b1a6a2e":          "whois.publicinterestregistry.net",
		"xn--imr513n":              "whois.nic.xn--imr513n",
		"xn--io0a7i":               "whois.ngtld.cn",
		"xn--j1aef":                "whois.nic.xn--j1aef",
		"xn--j1amh":                "whois.dotukr.com",
		"xn--j6w193g":              "whois.hkirc.hk",
		"xn--kcrx77d1x4a":          "whois.nic.xn--kcrx77d1x4a",
		"xn--kprw13d":              "whois.twnic.net.tw",
		"xn--kpry57d":              "whois.twnic.net.tw",
		"xn--kput3i":               "whois.afilias-srs.net",
		"xn--lgbbat1ad8j":          "whois.nic.dz",
		"xn--mgb9awbf":             "whois.registry.om",
		"xn--mgba3a3ejt":           "whois.nic.xn--mgba3a3ejt",
		"xn--mgba3a4f16a":          "whois.nic.ir",
		"xn--mgbaam7a8h":           "whois.aeda.net.ae",
		"xn--mgbab2bd":             "whois.bazaar.coreregistry.net",
		"xn--mgberp4a5d4ar":        "whois.nic.net.sa",
		"xn--mgbt3dhd":             "whois.agitsys.net",
		"xn--mgbtx2b":              "whois.cmc.iq",
		"xn--mgbx4cd0ab":           "whois.domainregistry.my",
		"xn--mk1bu44c":             "whois.nic.xn--mk1bu44c",
		"xn--mxtq1m":               "whois.nic.xn--mxtq1m",
		"xn--ngbc5azd":             "whois.xn--ngbc5azd.aridnrs.net.au",
		"xn--node":                 "whois.itdc.ge",
		"xn--nqv7f":                "whois.publicinterestregistry.net",
		"xn--nqv7fs00ema":          "whois.publicinterestregistry.net",
		"xn--nyqy26a":              "whois.nic.xn--nyqy26a",
		"xn--o3cw4h":               "whois.thnic.co.th",
		"xn--ogbpf8fl":             "whois.tld.sy",
		"xn--p1acf":                "whois.nic.xn--p1acf",
		"xn--p1ai":                 "whois.tcinet.ru",
		"xn--pssy2u":               "whois.nic.xn--pssy2u",
		"xn--q9jyb4c":              "domain-registry-whois.l.google.com",
		"xn--qcka1pmc":             "domain-registry-whois.l.google.com",
		"xn--rhqv96g":              "whois.nic.xn--rhqv96g",
		"xn--ses554g":              "whois.nic.xn--ses554g",
		"xn--t60b56a":              "whois.nic.xn--t60b56a",
		"xn--tckwe":                "whois.nic.xn--tckwe",
		"xn--unup4y":               "whois.donuts.co",
		"xn--vermgensberater-ctb":  "whois.ksregistry.net",
		"xn--vermgensberatung-pwb": "whois.ksregistry.net",
		"xn--vhquv":                "whois.donuts.co",
		"xn--vuq861b":              "whois.ngtld.cn",
		"xn--wgbl6a":               "whois.registry.qa",
		"xn--xhq521b":              "whois.ngtld.cn",
		"xn--y9a3aq":               "whois.amnic.net",
		"xn--yfro4i67o":            "whois.sgnic.sg",
		"xn--ygbi2ammx":            "whois.pnina.ps",
		"xn--zfr164b":              "whois.conac.cn",
		"xperia":                   "whois.nic.xperia",
		"xxx":                      "whois.nic.xxx",
		"xyz":                      "whois.nic.xyz",
		"yachts":                   "whois.afilias-srs.net",
		"yamaxun":                  "whois.nic.yamaxun",
		"yandex":                   "whois.nic.yandex",
		"yodobashi":                "whois.nic.gmo",
		"yoga":                     "whois-dub.mm-registry.com",
		"yokohama":                 "whois.nic.yokohama",
		"youtube":                  "domain-registry-whois.l.google.com",
		"yt":                       "whois.nic.yt",
		"zara":                     "whois.afilias-srs.net",
		"zero":                     "whois.nic.zero",
		"zip":                      "domain-registry-whois.l.google.com",
		"zm":                       "whois.nic.zm",
		"zone":                     "whois.donuts.co",
		"zuerich":                  "whois.ksregistry.net",
	}
)

const (
	// IANA_WHOIS_SERVER is iana whois server
	IANA_WHOIS_SERVER = "whois.iana.org"
	// DOMAIN_WHOIS_SERVER is tld whois server
	DOMAIN_WHOIS_SERVER = "whois-servers.net"
	// WHOIS_PORT is default whois port
	WHOIS_PORT = "43"
)

// Version returns package version
func Version() string {
	return "1.3.0"
}

// Author returns package author
func Author() string {
	return "[Li Kexian](https://www.likexian.com/)"
}

// License returns package license
func License() string {
	return "Licensed under the Apache License 2.0"
}

// Whois do the whois query and returns whois info
func Whois(domain string, servers ...string) (result string, err error) {
	domain = strings.Trim(strings.TrimSpace(domain), ".")
	if domain == "" {
		err = fmt.Errorf("Domain is empty")
		return
	}

	result, err = query(domain, servers...)
	if err != nil {
		return
	}

	token := "Registrar WHOIS Server:"
	if IsIpv4(domain) {
		token = "whois:"
	}

	start := strings.Index(result, token)
	if start == -1 {
		return
	}

	start += len(token)
	end := strings.Index(result[start:], "\n")
	server := strings.TrimSpace(result[start : start+end])
	if server == "" {
		return
	}

	tmpResult, err := query(domain, server)
	if err != nil {
		return
	}

	result += tmpResult

	return
}

// query do the query
func query(domain string, servers ...string) (result string, err error) {
	server := IANA_WHOIS_SERVER
	if len(servers) == 0 || servers[0] == "" {
		domains := strings.Split(domain, ".")
		if len(domains) < 1 {
			return "", errors.New("invalid domain")
		}
		var ok bool
		ext := domains[len(domains)-1]
		server, ok = whoisRoot[ext]
		if !ok {
			if strings.Contains(ext, "/") {
				ext = strings.Split(ext, "/")[0]
			}
			server = ext + "." + DOMAIN_WHOIS_SERVER
		}
	} else {
		server = strings.ToLower(servers[0])
		if server == "whois.arin.net" {
			domain = "n + " + domain
		}
	}

	conn, e := net.DialTimeout("tcp", net.JoinHostPort(server, WHOIS_PORT), time.Second*30)
	if e != nil {
		err = e
		return
	}

	defer conn.Close()
	_ = conn.SetReadDeadline(time.Now().Add(time.Second * 30))
	_, err = conn.Write([]byte(domain + "\r\n"))
	if err != nil {
		return
	}

	buffer, err := ioutil.ReadAll(conn)
	if err != nil {
		return
	}

	result = string(buffer)

	return
}

// IsIpv4 returns string is an ipv4 ip
func IsIpv4(ip string) bool {
	i := net.ParseIP(ip)
	return i.To4() != nil
}