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DNS query

From Rosetta Code
Task
DNS query
You are encouraged to solve this task according to the task description, using any language you may know.

DNS is an internet service that maps domain names, like rosettacode.org, to IP addresses, like 66.220.0.231.

Use DNS to resolve www.kame.net to both IPv4 and IPv6 addresses. Print these addresses.

Ada[edit]

Works with: GNAT GPL version Any - package Gnat.Sockets supports only IPv4 as of Jun 2011
with Ada.Text_IO;  use Ada.Text_IO;
with GNAT.Sockets; use GNAT.Sockets;
 
procedure DNSQuerying is
 
Host  : Host_Entry_Type (1, 1);
Inet_Addr_V4 : Inet_Addr_Type (Family_Inet);
begin
 
Host  := Get_Host_By_Name (Name => "www.kame.net");
Inet_Addr_V4 := Addresses (Host);
Put ("IPv4: " & Image (Value => Inet_Addr_V4));
end DNSQuerying;

AutoHotkey[edit]

This code uses Windows built-in 'nslookup' command (and a temporary file):

Url := "www.kame.net" , LogFile := "Ping_" A_Now ".log"
Runwait, %comspec% /c nslookup %Url%>%LogFile%, , hide
FileRead, Contents, %LogFile%
FileDelete, %LogFile%
RegExMatch(Contents,"Addresses:.+(`r?`n\s+.+)*",Match)
MsgBox, % RegExReplace(Match,"(Addresses:|[ `t])")

Batch File[edit]

:: DNS Query Task from Rosetta Code Wiki
:: Batch File Implementation
 
@echo off
 
set "domain=www.kame.net"
echo DOMAIN: "%domain%"
echo(
call :DNS_Lookup "%domain%"
pause
exit /b

::Main Procedure

::Uses NSLOOKUP Command. Also uses a dirty "parsing" to detect IP addresses.
:DNS_Lookup [domain]

::Define Variables and the TAB Character

set "dom=%~1"
set "record="
set "reccnt=0"
for /f "delims=" %%T in ('forfiles /p "%~dp0." /m "%~nx0" /c "cmd /c echo(0x09"') do set "TAB=%%T"
 
setlocal enabledelayedexpansion
for /f "tokens=1* delims=:" %%x in ('nslookup "!dom!" 2^>nul') do (
set "line=%%x"
if /i "!line:~0,4!"=="Name" set "record=yes"
if /i "!line:~0,5!"=="Alias" set "record="
if "!record!"=="yes" (
set /a reccnt+=1
if "%%y"=="" (set "catch_!reccnt!=%%x") else (set "catch_!reccnt!=%%x:%%y")
)
)
for /l %%c in (1,1,%reccnt%) do (
if /i "!catch_%%c:~0,7!"=="Address" echo(!catch_%%c:*s: =!
if /i "!catch_%%c:~0,1!"=="%TAB%" echo(!catch_%%c:%TAB% =!
)
endlocal
goto :EOF
Output:
DOMAIN: "www.kame.net"

2001:200:dff:fff1:216:3eff:feb1:44d7
203.178.141.194
Press any key to continue . . .

BBC BASIC[edit]

      name$ = "www.kame.net"
 
AF_INET = 2
AF_INET6 = 23
WSASYS_STATUS_LEN = 128
WSADESCRIPTION_LEN = 256
 
SYS "LoadLibrary", "WS2_32.DLL" TO ws2%
SYS "GetProcAddress", ws2%, "WSAStartup" TO `WSAStartup`
SYS "GetProcAddress", ws2%, "WSACleanup" TO `WSACleanup`
SYS "GetProcAddress", ws2%, "getaddrinfo" TO `getaddrinfo`
 
DIM WSAdata{wVersion{l&,h&}, wHighVersion{l&,h&}, \
\ szDescription&(WSADESCRIPTION_LEN), szSystemStatus&(WSASYS_STATUS_LEN), \
\ iMaxSockets{l&,h&}, iMaxUdpDg{l&,h&}, lpVendorInfo%}
 
DIM addrinfo{ai_flags%, ai_family%, ai_socktype%, ai_protocol%, \
\ ai_addrlen%, lp_ai_canonname%, lp_ai_addr%, lp_ai_next%}
DIM ipv4info{} = addrinfo{}, ipv6info{} = addrinfo{}
 
DIM sockaddr_in{sin_family{l&,h&}, sin_port{l&,h&}, sin_addr&(3), sin_zero&(7)}
DIM sockaddr_in6{sin6_family{l&,h&}, sin6_port{l&,h&}, sin6_flowinfo%, \
\ sin6_addr&(15), sin6_scope_id%}
 
SYS `WSAStartup`, &202, WSAdata{} TO res%
IF res% ERROR 102, "WSAStartup failed"
 
addrinfo.ai_family% = AF_INET
SYS `getaddrinfo`, name$, 0, addrinfo{}, ^ipv4info{}+4 TO res%
IF res% ERROR 103, "getaddrinfo failed"
 
 !(^sockaddr_in{}+4) = ipv4info.lp_ai_addr%
PRINT "IPv4 address = " ;
PRINT ;sockaddr_in.sin_addr&(0) "." sockaddr_in.sin_addr&(1) "." ;
PRINT ;sockaddr_in.sin_addr&(2) "." sockaddr_in.sin_addr&(3)
 
addrinfo.ai_family% = AF_INET6
SYS `getaddrinfo`, name$, 0, addrinfo{}, ^ipv6info{}+4 TO res%
IF res% ERROR 104, "getaddrinfo failed"
 
 !(^sockaddr_in6{}+4) = ipv6info.lp_ai_addr%
PRINT "IPv6 address = " ;
PRINT ;~sockaddr_in6.sin6_addr&(0) * 256 + sockaddr_in6.sin6_addr&(1) ":" ;
PRINT ;~sockaddr_in6.sin6_addr&(2) * 256 + sockaddr_in6.sin6_addr&(3) ":" ;
PRINT ;~sockaddr_in6.sin6_addr&(4) * 256 + sockaddr_in6.sin6_addr&(5) ":" ;
PRINT ;~sockaddr_in6.sin6_addr&(6) * 256 + sockaddr_in6.sin6_addr&(7) ":" ;
PRINT ;~sockaddr_in6.sin6_addr&(8) * 256 + sockaddr_in6.sin6_addr&(9) ":" ;
PRINT ;~sockaddr_in6.sin6_addr&(10) * 256 + sockaddr_in6.sin6_addr&(11) ":" ;
PRINT ;~sockaddr_in6.sin6_addr&(12) * 256 + sockaddr_in6.sin6_addr&(13) ":" ;
PRINT ;~sockaddr_in6.sin6_addr&(14) * 256 + sockaddr_in6.sin6_addr&(15)
 
SYS `WSACleanup`
 

Output:

IPv4 address = 203.178.141.194
IPv6 address = 2001:200:DFF:FFF1:216:3EFF:FEB1:44D7

C[edit]

This solution uses getaddrinfo(), a standard function from RFC 3493. This code resembles an example from getaddrinfo(3), the BSD manual page. Whereas the man page code connects to www.kame.net, this code only prints the numeric addresses.

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h> /* getaddrinfo, getnameinfo */
#include <stdio.h> /* fprintf, printf */
#include <stdlib.h> /* exit */
#include <string.h> /* memset */
 
int
main()
{
struct addrinfo hints, *res, *res0;
int error;
char host[NI_MAXHOST];
 
/*
* Request only one socket type from getaddrinfo(). Else we
* would get both SOCK_DGRAM and SOCK_STREAM, and print two
* copies of each numeric address.
*/

memset(&hints, 0, sizeof hints);
hints.ai_family = PF_UNSPEC; /* IPv4, IPv6, or anything */
hints.ai_socktype = SOCK_DGRAM; /* Dummy socket type */
 
/*
* Use getaddrinfo() to resolve "www.kame.net" and allocate
* a linked list of addresses.
*/

error = getaddrinfo("www.kame.net", NULL, &hints, &res0);
if (error) {
fprintf(stderr, "%s\n", gai_strerror(error));
exit(1);
}
 
/* Iterate the linked list. */
for (res = res0; res; res = res->ai_next) {
/*
* Use getnameinfo() to convert res->ai_addr to a
* printable string.
*
* NI_NUMERICHOST means to present the numeric address
* without doing reverse DNS to get a domain name.
*/

error = getnameinfo(res->ai_addr, res->ai_addrlen,
host, sizeof host, NULL, 0, NI_NUMERICHOST);
 
if (error) {
fprintf(stderr, "%s\n", gai_strerror(error));
} else {
/* Print the numeric address. */
printf("%s\n", host);
}
}
 
/* Free the linked list. */
freeaddrinfo(res0);
 
return 0;
}

C++[edit]

This example makes use of the Boost library. The asio bit is header-only, but requires linking boost-system (e.g. -lboost_system). The compiler may also need to be told to use C++11 semantics (e.g. -std=c++11).

 
#include <boost/asio.hpp>
#include <iostream>
 
int main() {
int rc {EXIT_SUCCESS};
try {
boost::asio::io_service io_service;
boost::asio::ip::tcp::resolver resolver {io_service};
auto entries = resolver.resolve({"www.kame.net", ""});
boost::asio::ip::tcp::resolver::iterator entries_end;
for (; entries != entries_end; ++entries) {
std::cout << entries->endpoint().address() << std::endl;
}
}
catch (std::exception& e) {
std::cerr << e.what() << std::endl;
rc = EXIT_FAILURE;
}
return rc;
}
 

C#[edit]

Implementation takes a host name string as a parameter, and returns the IP addresses in a comma-delimited string. Note that a failed lookup throws a SocketException.

 
private string LookupDns(string s)
{
try
{
System.Net.IPHostEntry ip = System.Net.Dns.GetHostEntry(s);
 
string result = ip.AddressList[0].ToString();
 
for (int i = 1; i < ip.AddressList.Length; ++i)
result += ", " + ip.AddressList[i].ToString();
 
return result;
}
catch (System.Net.Sockets.SocketException se)
{
return se.Message;
}
}
 

Caché ObjectScript[edit]

 
Class Utils.Net Extends %RegisteredObject
{
 
ClassMethod QueryDNS(pHost As %String, Output ip As %List) As %Status
{
// some initialisation
K ip S ip=""
 
// check host operating system and input parameters
S OS=$SYSTEM.Version.GetOS()
I '$LF($LB("Windows","UNIX"), OS) Q $$$ERROR($$$GeneralError, "Not implemented.")
I OS="Windows" S cmd="nslookup "_pHost
I OS="UNIX" S cmd="host "_pHost
I $MATCH(pHost, "^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$")=0 {
Q $$$ERROR($$$GeneralError, "Invalid host name.")
}
 
// invoke command
S list=##class(Utils.OS).Call(cmd, 0)
 
// iterate through list
S ptr=0, skip=1
WHILE $LISTNEXT(list,ptr,value) {
I value="" CONTINUE
I skip, OS="Windows" S skip=$S(value["Name:": 0, 1: 1) CONTINUE
S ipv4=..GetIPAddr("ipv4", value) I $L(ipv4) S $LI(ip, 4)=ipv4
S ipv6=..GetIPAddr("ipv6", value) I $L(ipv6) S $LI(ip, 6)=ipv6
}
 
// finished
I $LD(ip, 4)=0, $LD(ip, 6)=0 Q $$$ERROR($$$GeneralError, "Lookup failed.")
QUIT $$$OK
}
 
ClassMethod GetIPAddr(pType As %String = "", pValue As %String = "") As %String
{
I pType="ipv4" {
S pos=$LOCATE(pValue, "((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.|$)){4}")
I pos Q $P($E(pValue, pos, *), " ")
}
I pType="ipv6" {
S pos=$LOCATE(pValue, "([0-9A-Fa-f]{0,4}:){2,7}([0-9A-Fa-f]{1,4}$|((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|$)){4})")
I pos Q $P($E(pValue, pos, *), " ")
}
QUIT ""
}
 
}
 
 
Class Utils.OS Extends %RegisteredObject
{
 
ClassMethod Call(cmd, echo = 1) As %List
{
// instatiate pipe object
S list=""
S pipe=##class(%File).%New(cmd)
 
TRY {
//
S sc=pipe.Open("QR")
I $$$ISERR(sc) Q
 
// read queue/pipe and output to screen
DO {
K len S line=pipe.ReadLine(.len) I len=-1 Q
S $LI(list,$I(pos))=line
I echo W line,!
} WHILE $G(pos)<1000
 
} CATCH {
S ZE=$ZE
BREAK
}
 
// close pipe
D pipe.Close()
 
// return list value
Q list
}
 
}
 
Examples:
USER>Do ##class(Utils.Net).QueryDNS("www.kame.net", .ip)
USER>Write "IPv4 address = ", $ListGet(ip, 4, "Not found")
IPv4 address = 203.178.141.194
USER>Write "IPv6 address = ", $ListGet(ip, 6, "Not found")
IPv6 address = 2001:200:dff:fff1:216:3eff:feb1:44d7

USER>Do ##class(Utils.Net).QueryDNS("ipv6.google.com", .ip) 
USER>Write "IPv4 address = ", $ListGet(ip, 4, "Not found")
IPv4 address = Not found
USER>Write "IPv6 address = ", $ListGet(ip, 6, "Not found")
IPv6 address = 2a00:1450:400c:c05::93

Clojure[edit]

(import java.net.InetAddress java.net.Inet4Address java.net.Inet6Address)
 
(doseq [addr (InetAddress/getAllByName "www.kame.net")]
(cond
(instance? Inet4Address addr) (println "IPv4:" (.getHostAddress addr))
(instance? Inet6Address addr) (println "IPv6:" (.getHostAddress addr))))

Output:

IPv4: 203.178.141.194
IPv6: 2001:200:dff:fff1:216:3eff:feb1:44d7

CoffeeScript[edit]

 
# runs under node.js
dns = require 'dns'
 
dns.resolve4 'www.kame.net', (err, addresses) ->
console.log 'IP4'
console.log addresses
 
dns.resolve6 'www.kame.net', (err, addresses) ->
console.log 'IP6'
console.log addresses
 

Common Lisp[edit]

common lisp does not have a standard network api. the following examples are using native implementations

Works with: SBCL
(sb-bsd-sockets:host-ent-addresses 
(sb-bsd-sockets:get-host-by-name "www.rosettacode.org"))
(#(71 19 147 227))
Works with: CMUCL
(let ((hostname (extensions:lookup-host-entry "www.rosettacode.org")))
(print (map 'list #'extensions:ip-string (host-entry-addr-list hostname))))
("71.19.147.227")
Works with: Clozure
(ipaddr-to-dotted (lookup-hostname "www.rosettacode.org"))
"104.28.10.103"
Works with: Clisp
(hostent-addr-list (resolve-host-ipaddr "www.rosettacode.org"))
("104.28.11.103" "104.28.10.103")

the usocket library contains a (get-hosts-by-name) function in all of its backends. unfortunately it does not expose the functions in its public interface. but since the license is MIT, it may be a suitable source to copy code for your own use.

Library: iolib
is a portable library that:
Works with: SBCL
Works with: CMUCL
Works with: Clisp
Works with: Clozure
(iolib:lookup-hostname "www.kame.net" :ipv6 t)
 
#/IOLIB.SOCKETS:IP/203.178.141.194
(#/IOLIB.SOCKETS:IP/2001:200:dff:fff1:216:3eff:feb1:44d7)
"orange.kame.net"
(("orange.kame.net" . #/IOLIB.SOCKETS:IP/203.178.141.194)
("orange.kame.net" . #/IOLIB.SOCKETS:IP/2001:200:dff:fff1:216:3eff:feb1:44d7))

In Allegro Common Lisp there's a nice standard library called socket.

Works with: Allegro
(socket:ipaddr-to-dotted
(socket:dns-query "www.rosettacode.org"))
"104.28.10.103"

D[edit]

import std.stdio, std.socket;
 
void main() {
auto domain = "www.kame.net", port = "80";
 
auto a = getAddressInfo(domain, port, AddressFamily.INET);
writefln("IPv4 address for %s: %s", domain, a[0].address);
 
a = getAddressInfo(domain, port, AddressFamily.INET6);
writefln("IPv6 address for %s: %s", domain, a[0].address);
}
IPv4 address for www.kame.net: 203.178.141.194:80
IPv6 address for www.kame.net: [2001:200:dff:fff1:216:3eff:feb1:44d7]:80

Delphi[edit]

The included Indy components wrap GetAddressInfo.

program DNSQuerying;
 
{$APPTYPE CONSOLE}
 
uses
IdGlobal, IdStackWindows;
 
const
DOMAIN_NAME = 'www.kame.net';
var
lStack: TIdStackWindows;
begin
lStack := TIdStackWindows.Create;
try
Writeln(DOMAIN_NAME);
Writeln('IPv4: ' + lStack.ResolveHost(DOMAIN_NAME));
Writeln('IPv6: ' + lStack.ResolveHost(DOMAIN_NAME, Id_IPv6));
finally
lStack.Free;
end;
end.

Output:

www.kame.net
IPv4: 203.178.141.194
IPv6: 2001:200:DFF:FFF1:216:3EFF:FEB1:44D7

Go[edit]

package main
 
import (
"fmt"
"net"
)
 
func main() {
if addrs, err := net.LookupHost("www.kame.net"); err == nil {
fmt.Println(addrs)
} else {
fmt.Println(err)
}
}

Output:

[203.178.141.194 2001:200:dff:fff1:216:3eff:feb1:44d7]

Groovy[edit]

def addresses = InetAddress.getAllByName('www.kame.net')
println "IPv4: ${addresses.find { it instanceof Inet4Address }?.hostAddress}"
println "IPv6: ${addresses.find { it instanceof Inet6Address }?.hostAddress}"

Output:

IPv4: 203.178.141.194
IPv6: 2001:200:dff:fff1:216:3eff:feb1:44d7

Haskell[edit]

module Main where
 
import Network.Socket
 
getWebAddresses :: HostName -> IO [SockAddr]
getWebAddresses host = do
results <- getAddrInfo (Just defaultHints) (Just host) (Just "http")
return [ addrAddress a | a <- results, addrSocketType a == Stream ]
 
showIPs :: HostName -> IO ()
showIPs host = do
putStrLn $ "IP addresses for " ++ host ++ ":"
addresses <- getWebAddresses host
mapM_ (putStrLn . (" "++) . show) addresses
 
main = showIPs "www.kame.net"
 

Output:

IP addresses for www.kame.net:
  203.178.141.194:80
  [2001:200:dff:fff1:216:3eff:feb1:44d7]:80

Icon and Unicon[edit]

The following was tested only in Unicon:

 
procedure main(A)
host := gethost( A[1] | "www.kame.net") | stop("can't translate")
write(host.name, ": ", host.addresses)
end
 

Sample Run:

--> dns
orange.kame.net: 203.178.141.194

--> dns www.gogole.com
www.gogole.com: 74.125.225.183,119.119.119.46,74.125.225.184

J[edit]

J currently doesn't have a native DNS implementation, and this task doesn't seem to be asking for us to implement DNS on top of UDP+TCP (a full implementation of DNS has to fall back to TCP for messages which cannot fit in a UDP packet).

Also, there's currently an issue with IPv6 DNS servers not being reachable, so that query did not resolve.

Anyways:

   2!:0'dig -4 +short www.kame.net'
orange.kame.net.
203.178.141.194
 
2!:0'dig -6 +short www.kame.net'
|interface error
| 2!:0'dig -6 +short www.kame.net'

Put differently: in the IPv4 DNS system, www.kame.net is currently a CNAME record for orange.kame.net which had the address 203.178.141.194.

And, as mentioned above, the IPv6 DNS system was not reachable.

Java[edit]

import java.net.InetAddress;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.UnknownHostException;
 
class DnsQuery {
public static void main(String[] args) {
try {
InetAddress[] ipAddr = InetAddress.getAllByName("www.kame.net");
for(int i=0; i < ipAddr.length ; i++) {
if (ipAddr[i] instanceof Inet4Address) {
System.out.println("IPv4 : " + ipAddr[i].getHostAddress());
} else if (ipAddr[i] instanceof Inet6Address) {
System.out.println("IPv6 : " + ipAddr[i].getHostAddress());
}
}
} catch (UnknownHostException uhe) {
System.err.println("unknown host");
}
}
}
 

Output:

IPv4 : 203.178.141.194
IPv6 : 2001:200:dff:fff1:216:3eff:feb1:44d7

Lasso[edit]

The DNS lookup methods in Lasso do not support IPv6 addresses at this time, only IPv4.

dns_lookup('www.kame.net', -type='A')

NetRexx[edit]

 
/* NetRexx */
options replace format comments java crossref symbols nobinary
 
ir = InetAddress
addresses = InetAddress[] InetAddress.getAllByName('www.kame.net')
loop ir over addresses
if ir <= Inet4Address then do
say 'IPv4 :' ir.getHostAddress
end
if ir <= Inet6Address then do
say 'IPv6 :' ir.getHostAddress
end
end ir
 
Output
IPv4 : 203.178.141.194
IPv6 : 2001:200:dff:fff1:216:3eff:feb1:44d7

NewLISP[edit]

 
 
(define (dnsLookup site , ipv)
;; captures current IPv mode
(set 'ipv (net-ipv))
;; IPv mode agnostic lookup
(println "IPv4: " (begin (net-ipv 4) (net-lookup site)))
(println "IPv6: " (begin (net-ipv 6) (net-lookup site)))
;; returns newLISP to previous IPv mode
(net-ipv ipv)
)
 
(dnsLookup "www.kame.net")
 
Output
IPv4: 203.178.141.194
IPv6: 2001:200:dff:fff1:216:3eff:feb1:44d7

Oberon-2[edit]

Works with: oo2c version 2

IO:Address module supports only IPv4

 
MODULE DNSQuery;
IMPORT
IO:Address,
Out := NPCT:Console;
 
PROCEDURE Do() RAISES Address.UnknownHostException;
VAR
ip: Address.Inet;
BEGIN
ip := Address.GetByName("www.kame.net");
Out.String(ip.ToString());Out.Ln
END Do;
 
BEGIN
Do;
END DNSQuery.
 
Output:
203.178.141.194

OCaml[edit]

let dns_query ~host ~ai_family =
let opts = [
Unix.AI_FAMILY ai_family;
Unix.AI_SOCKTYPE Unix.SOCK_DGRAM;
] in
let addr_infos = Unix.getaddrinfo host "" opts in
match addr_infos with
| [] -> failwith "dns_query"
| ai :: _ ->
match ai.Unix.ai_addr with
| Unix.ADDR_INET (addr, _) -> (Unix.string_of_inet_addr addr)
| Unix.ADDR_UNIX addr -> failwith "addr_unix"
 
let () =
let host = "www.kame.net" in
Printf.printf "primary addresses of %s are:\n" host;
 
Printf.printf " IPv4 address: %s\n" (dns_query host Unix.PF_INET);
Printf.printf " IPv6 address: %s\n" (dns_query host Unix.PF_INET6);
;;

Perl[edit]

Unfortunately IPv6 was only added to Perl 5.14, a relatively new version.

require 5.014;    # Older versions can't resolve IPv6 with just core Socket module
 
use Socket qw(getaddrinfo getnameinfo);
my ($err, @res) = getaddrinfo("www.kame.net", 0,
{ protocol=>Socket::IPPROTO_TCP } );
die "getaddrinfo error: $err" if $err;
 
print getnameinfo($_->{addr}, Socket::NI_NUMERICHOST), "\n" for @res
 

Perl 6[edit]

Works with: Rakudo version 2017.01
use Net::DNS;
 
my $resolver = Net::DNS.new('8.8.8.8');
 
my $ip4 = $resolver.lookup('A', 'orange.kame.net');
my $ip6 = $resolver.lookup('AAAA', 'orange.kame.net');
 
say $ip4[0].octets.join: '.';
say $ip6[0].octets.».fmt("%.2X").join.comb(4).join: ':';
Output:
203.178.141.194
2001:0200:0dff:fff1:0216:3eff:feb1:44d7

PHP[edit]

Works for PHP5 (Windows > 5.3.0)

<?php
$ipv4_record = dns_get_record("www.kame.net",DNS_A);
$ipv6_record = dns_get_record("www.kame.net",DNS_AAAA);
print "ipv4: " . $ipv4_record[0]["ip"] . "\n";
print "ipv6: " . $ipv6_record[0]["ipv6"] . "\n";
?>

PicoLisp[edit]

(make
(in '(host "www.kame.net")
(while (from "address ")
(link (till "^J" T)) ) ) )

Output:

-> ("203.178.141.194" "2001:200:dff:fff1:216:3eff:feb1:44d7")

Pike[edit]

 
> array ips = Protocols.DNS.gethostbyname("www.kame.net")[1] || ({});
> write(ips*"\n");
 

Output:

203.178.141.194
2001:0200:0DFF:FFF1:0216:3EFF:FEB1:44D7

Python[edit]

>>> import socket
>>> ips = set(i[4][0] for i in socket.getaddrinfo('www.kame.net', 80))
>>> for ip in ips: print ip
...
2001:200:dff:fff1:216:3eff:feb1:44d7
203.178.141.194

R[edit]

R has no built-in function to accomplish the task, but with the help of the Rcpp package, it's possible to implement this functionality.

If the following is saved as dns.cpp:

 
#include <Rcpp.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
using namespace Rcpp ;
 
// [[Rcpp::export]]
CharacterVector getNameInfo(std::string fqdn) {
 
struct addrinfo hints, *res, *res0;
int error;
char host[NI_MAXHOST];
 
memset(&hints, 0, sizeof hints);
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
 
error = getaddrinfo(fqdn.c_str(), NULL, &hints, &res0);
if (error) { return(NA_STRING); }
 
int i = 0 ;
for (res = res0; res; res = res->ai_next) {
error = getnameinfo(res->ai_addr, res->ai_addrlen,
host, sizeof host, NULL, 0, NI_NUMERICHOST);
if (!error) { i++ ; }
}
 
CharacterVector results(i) ;
 
i = 0;
 
for (res = res0; res; res = res->ai_next) {
error = getnameinfo(res->ai_addr, res->ai_addrlen,
host, sizeof host, NULL, 0, NI_NUMERICHOST);
if (!error) { results[i++] = host ; }
}
 
freeaddrinfo(res0);
 
return(results) ;
 
}
 

It can be used to perform the task in R:

 
library(Rcpp)
sourceCpp("dns.cpp")
getNameInfo("www.kame.net")
## [1] "203.178.141.194"
## [2] "2001:200:dff:fff1:216:3eff:feb1:44d7"
 

Racket[edit]

The following finds an IPv4 address. Currently, the API does not support returning an IPv6 address.

 
#lang racket
 
(require net/dns)
(dns-get-address "8.8.8.8" "www.kame.net")
 

REXX[edit]

This REXX version uses the Windows (DOS)   PING   command to resolve the domain name.

Execution note:   if the information for     PING   -6   ···     is blank, you may need to install   (on some
Microsoft Windows systems)   the IPV6 interface using the command:     IPV6   install

/*REXX program displays  IPV4 and IPV6  addresses for a supplied  domain name.*/
parse arg tar . /*obtain optional domain name from C.L.*/
if tar=='' then tar= 'www.kame.net' /*Not specified? Then use the default.*/
tFID = '\TEMP\DNSQUERY.$$$' /*define temp file to store IPV4 output*/
pingOpts= '-l 0 -n 1 -w 0' tar /*define options for the PING command. */
trace off /*don't show PING none─zero return code*/
/* [↓] perform 2 versions of PING cmd.*/
do j=4 to 6 by 2 /*handle IPV4 and IPV6 addresses. */
'PING' (-j) pingOpts ">" tFID /*restrict PING's output to a minimum. */
q=charin(tFID, 1, 999) /*read the output file from PING cmd.*/
parse var q '[' ipaddr "]" /*parse IP address from the output. */
say 'IPV'j "for domain name " tar ' is ' ipaddr /*IPVx address.*/
call lineout tFID /* ◄──┬─◄ needed by some REXXes to */
end /*j*/ /* └─◄ force (TEMP) file integrity.*/
/*stick a fork in it, we're all done. */
'ERASE' tFID /*clean up (delete) the temporary file.*/

output   using the default input:

IPV4 for domain name   www.kame.net   is   203.178.141.194
IPV6 for domain name   www.kame.net   is   2001:200:dff:fff1:216:3eff:feb1:44d7

Ruby[edit]

irb(main):001:0> require 'socket'
=> true
irb(main):002:0> Addrinfo.getaddrinfo("www.kame.net", nil, nil, :DGRAM) \
irb(main):003:0* .map! { |ai| ai.ip_address }
=> ["203.178.141.194", "2001:200:dff:fff1:216:3eff:feb1:44d7"]

Rust[edit]

use std::net::ToSocketAddrs;
 
fn main() {
let host = "www.kame.net";
// Ideally, we would want to use std::net::lookup_host to resolve the host ips,
// but at time of writing this, it is still unstable. Fortunately, we can
// still resolve using the ToSocketAddrs trait, but we need to add a port,
// so we use the dummy port 0.
let host_port = (host, 0);
let ip_iter = host_port.to_socket_addrs().unwrap();
 
 
for ip_port in ip_iter {
println!("{}", ip_port.ip());
}
}
Output:
203.178.141.194
2001:200:dff:fff1:216:3eff:feb1:44d7

Scala[edit]

Library: Scala
import java.net.{Inet4Address, Inet6Address, InetAddress}
 
object DnsQuery extends App {
InetAddress.getAllByName("google.com").foreach {
case x: Inet4Address => println(s"IPv4 : ${x.getHostAddress}")
case x: Inet6Address => println(s"IPv6 : ${x.getHostAddress}")
}
}

Scheme[edit]

Works with: Guile
; Query DNS
(define n (car (hostent:addr-list (gethost "www.kame.net"))))
 
; Display address as IPv4 and IPv6
(display (inet-ntoa n))(newline)
(display (inet-ntop AF_INET n))(newline)
(display (inet-ntop AF_INET6 n))(newline)
Output:
203.178.141.194
203.178.141.194
::203.178.141.194

Seed7[edit]

The library socket.s7i defines the function inetSocketAddress, which returns an IPv4 address. It only returns an IPv6 address, when a host has no IPv4 address and the operating system supports IPv6. The function numericAddress is used to get the IP address of the specified host.

$ include "seed7_05.s7i";
include "socket.s7i";
 
const proc: main is func
begin
writeln(numericAddress(inetSocketAddress("www.kame.net", 1024)));
end func;

Output:

203.178.141.194

Sidef[edit]

var (err, *res) = Socket.getaddrinfo(
'www.kame.net', 0,
Hash.new(protocol => Socket.IPPROTO_TCP)
);
err && die err;
res.each { |z|
say [Socket.getnameinfo(z{:addr}, Socket.NI_NUMERICHOST)][1];
}
Output:
203.178.141.194
2001:200:dff:fff1:216:3eff:feb1:44d7

Tcl[edit]

While Tcl does internally do address resolution, it doesn't directly support looking up addresses without actually connecting to them. This is left to support packages to provide. An additional complexity is that while the DNS protocol itself is defined to work with both TCP and UDP as the transport layer, Tcl only supports TCP sockets by default (because they have a stream model) whereas DNS is typically only deployed with UDP enabled.

Library: Tcllib (Package: dns)
Library: udp
package require udp;  # Query by UDP more widely supported, but requires external package
package require dns
 
set host "www.kame.net"
set v4 [dns::resolve $host -type A]; # Specifically get IPv4 address
set v6 [dns::resolve $host -type AAAA]; # Specifically get IPv6 address
while {[dns::status $v4] eq "connect" || [dns::status $v6] eq "connect"} {
update; # Let queries complete
}
puts "primary addresses of $host are:\n\tIPv4» [dns::address $v4]\n\tIPv6» [dns::address $v6]"

Output:

primary addresses of www.kame.net are:
	IPv4» 203.178.141.194
	IPv6» 2001:200:dff:fff1:216:3eff:feb1:44d7

VBScript[edit]

 
Function dns_query(url,ver)
Set r = New RegExp
r.Pattern = "Pinging.+?\[(.+?)\].+"
Set objshell = CreateObject("WScript.Shell")
Set objexec = objshell.Exec("%comspec% /c " & "ping -" & ver & " " & url)
WScript.StdOut.WriteLine "URL: " & url
Do Until objexec.StdOut.AtEndOfStream
line = objexec.StdOut.ReadLine
If r.Test(line) Then
WScript.StdOut.WriteLine "IP Version " &_
ver & ": " & r.Replace(line,"$1")
End If
Loop
End Function
 
Call dns_query(WScript.Arguments(0),WScript.Arguments(1))
 
Output:
F:\>cscript /nologo dns_query.vbs www.kame.net 4
URL: www.kame.net
IP Version 4: 203.178.141.194

F:\>cscript /nologo dns_query.vbs www.kame.net 6
URL: www.kame.net
IP Version 6: 2001:200:dff:fff1:216:3eff:feb1:44d7

zkl[edit]

The addrInfo method is just a front end to POSIX getaddrinfo.

zkl: Network.TCPClientSocket.addrInfo("www.kame.net")
L("orange.kame.net",L("203.178.141.194","2001:200:dff:fff1:216:3eff:feb1:44d7"))