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
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;
with Ada.Text_IO; use Ada.Text_IO;
with GNAT.Sockets; use Gnat.Sockets;
procedure DNSQuerying is
procedure Print_Address_Info (Host, Serv : String; Family : Family_Type := Family_Unspec) is
Addresses : Address_Info_Array := Get_Address_Info (Host, Serv, Family, Passive => False, Numeric_Host => False);
Inet_Addr_V6: Inet_Addr_Type(Family_Inet6);
begin
Sort (Addresses, IPv6_TCP_Preferred'Access);
Inet_Addr_V6 := Addresses(1).Addr.Addr;
Put_Line("IPv6: " & Image(Value => Inet_Addr_V6));
end Print_Address_Info;
begin
Print_Address_Info ("ipv6.google.com", "https", Family_Inet6);
end DNSQuerying;
ARM Assembly
/* ARM assembly Raspberry PI */
/* program dnsquery.s */
/************************************/
/* Constantes */
/************************************/
.equ STDIN, 0 @ Linux input console
.equ STDOUT, 1 @ Linux output console
.equ EXIT, 1 @ Linux syscall END PROGRAM
.equ FORK, 2 @ Linux syscall
.equ READ, 3 @ Linux syscall
.equ WRITE, 4 @ Linux syscall
.equ OPEN, 5 @ Linux syscall
.equ CLOSE, 6 @ Linux syscall
.equ EXECVE, 0xB @ Linux syscall
.equ PIPE, 0x2A @ Linux syscall
.equ DUP2, 0x3F @ Linux syscall
.equ WAIT4, 0x72 @ Linux syscall
.equ WUNTRACED, 2 @ Wait, return status of stopped child
.equ TAILLEBUFFER, 500
/*********************************/
/* Initialized data */
/*********************************/
.data
szCarriageReturn: .asciz "\n"
szMessFinOK: .asciz "Fin normale du programme. \n"
szMessError: .asciz "Error occured !!!"
szCommand: .asciz "/usr/bin/host" @ command host
szNameHost: .asciz "www.kame.net" @ string query name
.align 4
stArg1: .int szCommand @ address command
.int szNameHost @ address argument
.int 0,0 @ zeroes
/*********************************/
/* UnInitialized data */
/*********************************/
.bss
.align 4
iStatusThread: .skip 4
pipefd: .skip 8
sBuffer: .skip TAILLEBUFFER
stRusage: .skip TAILLEBUFFER
/*********************************/
/* code section */
/*********************************/
.text
.global main
main: @ entry of program
/* création pipe */
ldr r0,iAdrpipefd @ FDs address
mov r7, #PIPE @ create pipe
svc 0 @ call system Linux
cmp r0,#0 @ error ?
blt 99f
/* create child thread */
mov r0,#0
mov r7, #FORK @ call system
svc #0
cmp r0,#0 @ error ?
blt 99f
bne parent @ if <> zero r0 contains father pid
@ else is the child
/****************************************/
/* Child thread */
/****************************************/
/* redirection sysout -> pipe */
ldr r0,iAdrpipefd
ldr r0,[r0,#4]
mov r7, #DUP2 @ call system linux
mov r1, #STDOUT @
svc #0
cmp r0,#0 @ error ?
blt 99f
/* run command host */
ldr r0, iAdrszCommand @ r0 = address de "/usr/bin/host"
ldr r1,iAdrstArg1 @ address argument 1
mov r2,#0
mov r7, #EXECVE @ call system linux (execve)
svc #0 @ if ok -> no return !!!
b 100f @ never exec this label
/****************************************/
/* Father thread */
/****************************************/
parent:
mov r4,r0 @ save child pid
1: @ loop child signal
mov r0,r4
ldr r1,iAdriStatusThread @ return status thread
mov r2,#WUNTRACED @ flags
ldr r3,iAdrstRusage @ return structure thread
mov r7, #WAIT4 @ Call System
svc #0
cmp r0,#0 @ error ?
blt 99f
@ recup status
ldr r0,iAdriStatusThread @ analyse status
ldrb r0,[r0] @ firest byte
cmp r0,#0 @ normal end thread ?
bne 1b @ loop
/* close entry pipe */
ldr r0,iAdrpipefd
mov r7,#CLOSE @ call system
svc #0
/* read datas pipe */
ldr r0,iAdrpipefd
ldr r0,[r0]
ldr r1,iAdrsBuffer @ buffer address
mov r2,#TAILLEBUFFER @ buffer size
mov r7, #READ @ call system
svc #0
ldr r0,iAdrsBuffer @ display buffer
bl affichageMess
ldr r0,iAdrszMessFinOK @ display message Ok
bl affichageMess
mov r0, #0 @ return code
b 100f
99:
ldr r0,iAdrszMessError @ erreur
bl affichageMess
mov r0, #1 @ return code
b 100f
100: @ standard end of the program
mov r7, #EXIT @ request to exit program
svc #0 @ perform the system call
iAdrszCarriageReturn: .int szCarriageReturn
iAdrszMessFinOK: .int szMessFinOK
iAdrszMessError: .int szMessError
iAdrsBuffer: .int sBuffer
iAdrpipefd: .int pipefd
iAdrszCommand: .int szCommand
iAdrstArg1: .int stArg1
iAdriStatusThread: .int iStatusThread
iAdrstRusage: .int stRusage
/******************************************************************/
/* display text with size calculation */
/******************************************************************/
/* r0 contains the address of the message */
affichageMess:
push {r0,r1,r2,r7,lr} @ save registres
mov r2,#0 @ counter length
1: @ loop length calculation
ldrb r1,[r0,r2] @ read octet start position + index
cmp r1,#0 @ if 0 its over
addne r2,r2,#1 @ else add 1 in the length
bne 1b @ and loop
@ so here r2 contains the length of the message
mov r1,r0 @ address message in r1
mov r0,#STDOUT @ code to write to the standard output Linux
mov r7, #WRITE @ code call system "write"
svc #0 @ call systeme
pop {r0,r1,r2,r7,lr} @ restaur des 2 registres */
bx lr @ returnATS
This has been tested on Gentoo Linux with PATSHOME properly set.
You need some X/Open standard stuff in your libc, so running the default patscc (which sets -std=c99) will not work. I have written the code so you can compile with myatscc.
(*
This program has to be compiled without -std=c99, which patscc will
insert unless you override the setting.
##myatsccdef=\
patscc \
-atsccomp gcc \
-I"${PATSHOME}" \
-I"${PATSHOME}/ccomp/runtime" \
-L"${PATSHOME}/ccomp/atslib/lib" \
-DATS_MEMALLOC_LIBC \
-o $fname($1) $1
*)
(* The code below is largely C, but the ATS interface enforces memory
management. For instance, try removing the call to "addrinfo_free",
and see what happens. You will get an error message from the
compiler. *)
#include "share/atspre_staload.hats"
staload UN = "prelude/SATS/unsafe.sats"
#define ATS_EXTERN_PREFIX "rosetta_code_"
%{^
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
ATSinline() atstype_int
rosetta_code__getaddrinfo (atstype_ptr node,
atstype_ptr service,
atstype_int ai_flags,
atstype_int ai_family,
atstype_int ai_socktype,
atstype_int ai_protocol,
atstype_ptr res)
{
struct addrinfo hints;
memset (&hints, 0, sizeof hints);
hints.ai_flags = ai_flags;
hints.ai_family = ai_family;
hints.ai_socktype = ai_socktype;
hints.ai_protocol = ai_protocol;
return getaddrinfo ((const char *) node,
(const char *) service,
&hints,
(struct addrinfo **) res);
}
ATSinline() atstype_void
rosetta_code__freeaddrinfo (atstype_ptr res)
{
freeaddrinfo ((struct addrinfo *) res);
}
ATSinline() atstype_string
rosetta_code__gai_strerror (atstype_int errcode)
{
return (atstype_string) gai_strerror (errcode);
}
ATSinline() atstype_ptr
rosetta_code__ai_next (atstype_ptr p)
{
return (atstype_ptr) ((struct addrinfo *) p)->ai_next;
}
ATSinline() void
rosetta_code__ai_get_numeric_host (atstype_ptr addrinfo,
atstype_ptr host,
atstype_ptr errcode)
{
struct addrinfo *p_addrinfo = (struct addrinfo *) addrinfo;
char **p_host = (char **) host;
int *p_errcode = (int *) errcode;
char buf[NI_MAXHOST];
*p_errcode = getnameinfo (p_addrinfo->ai_addr,
p_addrinfo->ai_addrlen,
buf, sizeof buf, NULL, 0,
NI_NUMERICHOST);
*p_host = ( *p_errcode == 0 ) ? (strdup (buf)) : NULL;
}
%}
#define NIL list_vt_nil ()
#define :: list_vt_cons
implement list_vt_freelin$clear<Strptr1> s = strptr_free s
macdef AF_UNSPEC = $extval (int, "AF_UNSPEC")
macdef SOCK_DGRAM = $extval (int, "SOCK_DGRAM")
absview addrinfo_v (p : addr,
freeable : bool)
vtypedef addrinfo (p : addr,
freeable : bool) =
[null < p]
@(addrinfo_v (p, freeable) |
ptr p)
vtypedef addrinfo (p : addr) =
[freeable : bool]
addrinfo (p, freeable)
vtypedef addrinfo (freeable : bool) =
[p : addr]
addrinfo (p, freeable)
vtypedef addrinfo =
[p : addr]
[freeable : bool]
addrinfo (p, freeable)
vtypedef freeable_addrinfo (p : addr) = addrinfo (p, true)
vtypedef freeable_addrinfo = addrinfo true
vtypedef unfreeable_addrinfo (p : addr) = addrinfo (p, false)
vtypedef unfreeable_addrinfo = addrinfo false
fn
addrinfo_strerror (errcode : int)
: string =
let
extern fn _gai_strerror : int -<> string = "mac#%"
in
_gai_strerror errcode
end
fn
addrinfo_fetch (node : !Strptr0,
service : !Strptr0,
ai_flags : int,
ai_family : int,
ai_socktype : int,
ai_protocol : int,
error : &int? >> int)
: Option_vt ([p : agz] addrinfo (p, true)) =
let
extern fn
_getaddrinfo (node : !Strptr0,
service : !Strptr0,
ai_flags : int,
ai_family : int,
ai_socktype : int,
ai_protocol : int,
result : &ptr? >> ptr p)
: #[p : addr]
int = "mac#%"
var p : ptr
val err = _getaddrinfo (node, service, ai_flags, ai_family,
ai_socktype, ai_protocol, p)
prval [p : addr] EQADDR () = eqaddr_make_ptr p
in
error := err;
if (err = 0) * (isneqz p) then
let
extern praxi make_view : () -<prf> addrinfo_v (p, true)
in
Some_vt @(make_view () | p)
end
else
None_vt ()
end
fn
addrinfo_free {p : addr}
(addrinfo : freeable_addrinfo p)
: void =
let
extern fn _freeaddrinfo : ptr -> void = "mac#%"
extern praxi consume_view : addrinfo_v (p, true) -<prf> void
val @(pf | p) = addrinfo
prval () = consume_view pf
in
_freeaddrinfo p
end
prfn
unfreeable_addrinfo_finalize {p : addr}
(addrinfo : unfreeable_addrinfo p)
:<prf> void =
let
extern praxi consume_view : addrinfo_v (p, false) -<prf> void
in
consume_view (addrinfo.0)
end
fn
addrinfo_next (addrinfo : !addrinfo)
:<> Option_vt (addrinfo false) =
let
extern fn _ai_next : ptr -<> [q : agez] ptr q = "mac#%"
val [q : addr] q = _ai_next (addrinfo.1)
in
if iseqz q then
None_vt ()
else
let
extern praxi make_view : () -<prf> addrinfo_v (q, false)
in
Some_vt @(make_view () | q)
end
end
fn
addrinfo_get_numeric_host (addrinfo : !addrinfo,
errcode : &int? >> int)
: Option_vt Strptr1 =
let
extern fn
_ai_get_numeric_host (addrinfo : Ptr,
host : &ptr? >> Ptr,
errcode : &int? >> int)
: void = "mac#%"
var host : ptr
in
_ai_get_numeric_host (addrinfo.1, host, errcode);
if (errcode = 0) * (isneqz host) then
Some_vt ($UN.castvwtp0 host)
else
None_vt ()
end
fn
get_numeric_hosts (addrinfo : !freeable_addrinfo)
: Option_vt (List1_vt Strptr1) =
let
fun
loop (ainfo : !unfreeable_addrinfo,
accum : List1_vt Strptr1)
: Option_vt (List1_vt Strptr1) =
let
var errcode : int
val ai_opt = addrinfo_get_numeric_host (ainfo, errcode)
in
case+ ai_opt of
| ~ None_vt () =>
begin
list_vt_freelin<Strptr1> accum;
fprintln! (stderr_ref, "Error: ",
addrinfo_strerror errcode);
None_vt ()
end
| ~ Some_vt host =>
let
val next_ai_opt = addrinfo_next ainfo
and accum = host :: accum
in
case+ next_ai_opt of
| ~ None_vt () => Some_vt (list_vt_reverse accum)
| ~ Some_vt next_ai =>
let
val retval = loop (next_ai, accum)
prval () = unfreeable_addrinfo_finalize next_ai
in
retval
end
end
end
var errcode : int
val ai_opt = addrinfo_get_numeric_host (addrinfo, errcode)
in
case+ ai_opt of
| ~ None_vt () =>
begin
fprintln! (stderr_ref, "Error: ", addrinfo_strerror errcode);
None_vt ()
end
| ~ Some_vt host =>
let
val next_ai_opt = addrinfo_next addrinfo
and accum = host :: NIL
in
case+ next_ai_opt of
| ~ None_vt () => Some_vt accum
| ~ Some_vt next_ai =>
let
val retval = loop (next_ai, accum)
prval () = unfreeable_addrinfo_finalize next_ai
in
retval
end
end
end
implement
main0 () =
let
val hostname = string0_copy "www.kame.net"
val service = strptr_null ()
var errcode : int
val ai_opt = addrinfo_fetch (hostname, service, 0, AF_UNSPEC,
SOCK_DGRAM, 0, errcode)
val () = strptr_free hostname
prval () = strptr_free_null service
in
case+ ai_opt of
| ~ None_vt () =>
begin
fprintln! (stderr_ref, "Error: ", addrinfo_strerror errcode);
exit 1
end
| ~ Some_vt addrinfo =>
let
val hosts_opt = get_numeric_hosts addrinfo
in
addrinfo_free addrinfo;
case+ hosts_opt of
| ~ None_vt () => exit 1
| ~ Some_vt hosts =>
begin
println! ($UN.castvwtp1{List1 string} hosts);
list_vt_freelin hosts
end
end
end- Output:
$ myatscc dns-query.dats && ./dns-query 210.155.141.200, 2001:2f0:0:8800:226:2dff:fe0b:4311, 2001:2f0:0:8800::1:1
AutoHotkey
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
:: 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
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
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#
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;
}
}
C++
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;
}
Caché ObjectScript
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
(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
# 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
common lisp does not have a standard network api. the following examples are using native implementations
(sb-bsd-sockets:host-ent-addresses
(sb-bsd-sockets:get-host-by-name "www.rosettacode.org"))
(#(71 19 147 227))
(let ((hostname (extensions:lookup-host-entry "www.rosettacode.org")))
(print (map 'list #'extensions:ip-string (host-entry-addr-list hostname))))
("71.19.147.227")
(ipaddr-to-dotted (lookup-hostname "www.rosettacode.org"))
"104.28.10.103"
(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.
is a portable library that:
(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.
(socket:ipaddr-to-dotted
(socket:dns-query "www.rosettacode.org"))
"104.28.10.103"
In Lispworks the COMM package provides information about IP addresses.
(require "comm")
(comm:ip-address-string (comm:get-host-entry "www.rosettacode.org" :fields '(:address)))
"104.28.10.103"
Crystal
require "socket"
Socket::Addrinfo.resolve(
"www.kame.net",
80,
type: Socket::Type::STREAM
).each { |a|
puts a.ip_address.address
}
- Output:
203.178.141.194 2001:200:dff:fff1:216:3eff:feb1:44d7
D
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
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
Erlang
33> {ok, {hostent, Host, Aliases, AddrType, Bytes, AddrList}} = inet:gethostbyname("www.kame.net", inet).
{ok,{hostent,"orange.kame.net",
["www.kame.net"],
inet,4,
[{203,178,141,194}]}}
34> [inet_parse:ntoa(Addr) || Addr <- AddrList].
["203.178.141.194"]
35> f().
ok
36> {ok, {hostent, Host, Aliases, AddrType, Bytes, AddrList}} = inet:gethostbyname("www.kame.net", inet6).
{ok,{hostent,"orange.kame.net",[],inet6,16,
[{8193,512,3583,65521,534,16127,65201,17623}]}}
37> [inet_parse:ntoa(Addr) || Addr <- AddrList].
["2001:200:DFF:FFF1:216:3EFF:FEB1:44D7"]
Factor
USING: dns io kernel sequences ;
"www.kame.net" [ dns-A-query ] [ dns-AAAA-query ] bi
[ message>names second print ] bi@
- Output:
203.178.141.194 2001:200:dff:fff1:216:3eff:feb1:44d7
FreeBASIC
#include "win\winsock2.bi"
Function GetSiteAddress(stuff As String = "www.freebasic.net") As Long
Dim As WSADATA _wsadate
Dim As in_addr addr
Dim As hostent Ptr res
Dim As Integer i = 0
WSAStartup(MAKEWORD(2,2),@_wsadate)
res = gethostbyname(stuff)
If res Then
Print !"\nURL: "; stuff
While (res->h_addr_list[i] <> 0)
addr.s_addr = *(Cast (Ulong Ptr,res->h_addr_list[i]))
Print "IPv4 address: ";*inet_ntoa(addr)
i+=1
Wend
WSACleanup()
Return 1
Else
Print "website error?"
Return 0
End If
End Function
GetSiteAddress "rosettacode.org"
GetSiteAddress "www.kame.net"
Sleep
- Output:
URL: rosettacode.org IPv4 address: 108.175.15.182 IPv4 address: 74.208.203.152 URL: www.kame.net IPv4 address: 210.155.141.200
Frink
for a = callJava["java.net.InetAddress", "getAllByName", "www.kame.net"]
println[a.getHostAddress[]]- Output:
210.155.141.200 2001:2f0:0:8800:226:2dff:fe0b:4311 2001:2f0:0:8800:0:0:1:1
FutureBasic
FB has several ways to query a DNS server. In FB 7.0.23 the unix statement/function was added making such queries trivial:
print unix @"nslookup -querytype=A www.kame.net"
HandleEventsClassic FB:
Str255 UnixCommand
Str255 UnixResponse
print "DNS IPv4 resolved for www.kame.net:"
UnixCommand = "nslookup -querytype=A www.kame.net"
open "UNIX", 1, UnixCommand
while ( not eof( 1 ) )
input #1, UnixResponse
print UnixResponse
wend
close 1
print ""
print "DNS IPv6 resolved for www.kame.net:"
UnixCommand = "nslookup -querytype=AAAA www.kame.net"
open "UNIX", 1, UnixCommand
while ( not eof( 1 ) )
input #1, UnixResponse
print UnixResponse
wend
close 1
HandleEvents- Output:
DNS IPv4 resolved for www.kame.net: Server: 2001:1998:f00:2::1 Address: 2001:1998:f00:2::1#53 Non-authoritative answer: www.kame.net canonical name = mango.itojun.org. Name: mango.itojun.org Address: 210.155.141.200 DNS IPv6 resolved for www.kame.net: Server: 2001:1998:f00:2::1 Address: 2001:1998:f00:2::1#53 Non-authoritative answer: www.kame.net canonical name = mango.itojun.org. mango.itojun.org has AAAA address 2001:2f0:0:8800::1:1 mango.itojun.org has AAAA address 2001:2f0:0:8800:226:2dff:fe0b:4311
Go
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
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
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
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
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
This is the same implementation as below, just less code
import java.net.InetAddress;
import java.net.UnknownHostException;
public static void main(String[] args) throws UnknownHostException {
/* 'getAllByName' will use the system configured 'resolver' */
for (InetAddress ip : InetAddress.getAllByName("www.kame.net"))
System.out.println(ip.getHostAddress());
}
210.155.141.200 2001:2f0:0:8800:226:2dff:fe0b:4311 2001:2f0:0:8800:0:0:1:1
An alternate demonstration
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
JavaScript
const dns = require("dns");
dns.lookup("www.kame.net", {
all: true
}, (err, addresses) => {
if(err) return console.error(err);
console.log(addresses);
})
Output:
[ { address: '203.178.141.194', family: 4 },
{ address: '2001:200:dff:fff1:216:3eff:feb1:44d7', family: 6 } ]
Julia
As entered at the REPL command line:
julia> using Sockets
julia> getaddrinfo("www.kame.net")
ip"203.178.141.194"
julia> getaddrinfo("www.kame.net", IPv6)
ip"2001:200:dff:fff1:216:3eff:feb1:44d7"
Kotlin
// version 1.1.3
import java.net.InetAddress
import java.net.Inet4Address
import java.net.Inet6Address
fun showIPAddresses(host: String) {
try {
val ipas = InetAddress.getAllByName(host)
println("The IP address(es) for '$host' is/are:\n")
for (ipa in ipas) {
print(when (ipa) {
is Inet4Address -> " ipv4 : "
is Inet6Address -> " ipv6 : "
else -> " ipv? : "
})
println(ipa.hostAddress)
}
}
catch (ex: Exception) {
println(ex.message)
}
}
fun main(args: Array<String>) {
showIPAddresses("www.kame.net")
}
- Output:
The IP address(es) for 'www.kame.net' is/are: ipv4 : 203.178.141.194 ipv6 : 2001:200:dff:fff1:216:3eff:feb1:44d7
Lasso
The DNS lookup methods in Lasso do not support IPv6 addresses at this time, only IPv4.
dns_lookup('www.kame.net', -type='A')
Lua
local socket = require('socket')
local ip_tbl = socket.dns.getaddrinfo('www.kame.net')
for _, v in ipairs(ip_tbl) do
io.write(string.format('%s: %s\n', v.family, v.addr))
end
- Output:
inet: 203.178.141.194 inet6: 2001:200:dff:fff1:216:3eff:feb1:44d7
Neko
Neko does not yet support ipv6. ipv4 addresses are returned as Int32.
/* dns in neko */
var host_resolve = $loader.loadprim("std@host_resolve", 1);
var host_to_string = $loader.loadprim("std@host_to_string", 1);
var host_reverse = $loader.loadprim("std@host_reverse", 1);
var ip = host_resolve("www.kame.net");
$print("www.kame.net: ", ip, ", ", host_to_string(ip), "\n");
$print(host_to_string(ip), ": ", host_reverse(ip), "\n");
- Output:
prompt$ nekoc dns.neko prompt$ neko dns www.kame.net: -1030901045, 203.178.141.194 203.178.141.194: orange.kame.net
NetRexx
/* 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
(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
Nim
import nativesockets
iterator items(ai: ptr AddrInfo): ptr AddrInfo =
var current = ai
while current != nil:
yield current
current = current.aiNext
proc main() =
let addrInfos = getAddrInfo("www.kame.net", Port 80, AfUnspec)
defer: freeAddrInfo addrInfos
for i in addrInfos:
echo getAddrString i.aiAddr
when isMainModule: main()
- Output:
2001:200:dff:fff1:216:3eff:feb1:44d7 203.178.141.194
Oberon-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
Objeck
use System.IO.Net;
class Rosetta {
function : Main(args : String[]) ~ Nil {
resoloved := TCPSocket->Resolve("www.kame.net");
each(i : resoloved) {
resoloved[i]->PrintLine();
};
}
}Output:
203.178.141.194
OCaml
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
use feature 'say';
use Socket qw(getaddrinfo getnameinfo);
my ($err, @res) = getaddrinfo('orange.kame.net', 0, { protocol=>Socket::IPPROTO_TCP } );
die "getaddrinfo error: $err" if $err;
say ((getnameinfo($_->{addr}, Socket::NI_NUMERICHOST))[1]) for @res
- Output:
203.178.141.194 2001:200:dff:fff1:216:3eff:feb1:44d7
Phix
Translated from C/MSDN/several man pages.
NB: may warrant further testing, see output.
without js include builtins\cffi.e constant AF_UNSPEC = 0, -- AF_INET = 2, -- AF_INET6 = 23, -- SOCK_STREAM = 1, SOCK_DGRAM = 2, -- IPPROTO_TCP = 6, NI_MAXHOST = 1025, NI_NUMERICHOST = iff(platform()=LINUX?1:2) constant tWAD = """ typedef struct WSAData { WORD wVersion; WORD wHighVersion; char szDescription[257]; char szSystemStatus[129]; unsigned short iMaxSockets; unsigned short iMaxUdpDg; char *lpVendorInfo; } WSADATA, *LPWSADATA; """, tWAS = """ int WSAStartup( _In_ WORD wVersionRequested, _Out_ LPWSADATA lpWSAData ); """, tWAC = """ int WSACleanup(void); """, tAI_W=""" typedef struct addrinfo { int ai_flags; int ai_family; int ai_socktype; int ai_protocol; size_t ai_addrlen; char *ai_canonname; struct sockaddr *ai_addr; struct addrinfo *ai_next; } ADDRINFOA, *PADDRINFOA; """, tAI_L=""" typedef struct addrinfo { int ai_flags; int ai_family; int ai_socktype; int ai_protocol; int ai_addrlen; struct sockaddr *ai_addr; char *ai_canonname; struct addrinfo *ai_next; }; """, tGAI = """ int getaddrinfo( _In_opt_ PCSTR pNodeName, _In_opt_ PCSTR pServiceName, _In_opt_ const ADDRINFOA *pHints, _Out_ PADDRINFOA *ppResult ); """, --int getaddrinfo(const char *node, const char *service, -- const struct addrinfo *hints, -- struct addrinfo **res); tGNI = """ int getnameinfo( _In_ sockaddr *sa, _In_ int salen, _Out_ char *host, _In_ DWORD hostlen, _Out_ char *serv, _In_ DWORD servlen, _In_ int flags ); """, --int getnameinfo(const struct sockaddr *addr, socklen_t addrlen, -- char *host, socklen_t hostlen, -- char *serv, socklen_t servlen, int flags); tFAI = """ void freeaddrinfo( _In_ struct addrinfo *ai ); """ --void freeaddrinfo(struct addrinfo *res); integer xgetaddrinfo = NULL, xgetnameinfo, xfreeaddrinfo, idAI, xwsastartup, xwsacleanup, error function get_name_info(string fqdn) if xgetaddrinfo=NULL then atom lib if platform()=WINDOWS then integer idWAD = define_struct(tWAD) atom pWAD = allocate_struct(idWAD,cleanup:=true) lib = open_dll("Ws2_32.dll") xwsastartup = define_cffi_func(lib,tWAS) xwsacleanup = define_cffi_func(lib,tWAC) error = c_func(xwsastartup,{#00020002,pWAD}) if error then ?9/0 end if idAI = define_struct(tAI_W) elsif platform()=LINUX then lib = open_dll("libc.so.6") idAI = define_struct(tAI_L) end if xgetaddrinfo = define_cffi_func(lib,tGAI) xgetnameinfo = define_cffi_func(lib,tGNI) xfreeaddrinfo = define_cffi_proc(lib,tFAI) end if atom hints = allocate_struct(idAI,cleanup:=true), res = allocate(machine_word(),cleanup:=true), host = allocate(NI_MAXHOST,cleanup:=true) set_struct_field(idAI,hints,"ai_family",AF_UNSPEC) -- set_struct_field(idAI,hints,"ai_socktype",SOCK_STREAM) set_struct_field(idAI,hints,"ai_socktype",SOCK_DGRAM) error = c_func(xgetaddrinfo,{fqdn,NULL,hints,res}) if error then ?9/0 end if res = peekNS(res,machine_word(),false) atom ptr = res sequence results = {} while ptr!=NULL do atom addr = get_struct_field(idAI,ptr,"ai_addr") integer len = get_struct_field(idAI,ptr,"ai_addrlen") error = c_func(xgetnameinfo,{addr, len, host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST}) if error then ?9/0 end if results = append(results,peek_string(host)) ptr = get_struct_field(idAI,ptr,"ai_next") end while c_proc(xfreeaddrinfo,{res}) return results end function procedure WSACleanup() if platform()=WINDOWS then error = c_func(xwsacleanup,{}) if error then crash("WSACleanup failed: %d\n",{error}) end if end if end procedure ?get_name_info("www.kame.net") WSACleanup()
- Output:
Note that windows nslookup shows an IPv6 that this does not, whereas the exact reverse is true for linux on a VirtualBox (same machine)...
Windows:
>nslookup www.kame.net
Addresses: 2001:200:dff:fff1:216:3eff:feb1:44d7
203.178.141.194
>p test
{"203.178.141.194"}
Linux:
$ nslookup www.kame.net
Address: 203.178.141.194
$ ./p test
{"203.178.141.194","2001:200:dff:fff1:216:3eff:feb1:44d7"}
PHP
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
(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
> 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
PowerShell
$DNS = Resolve-DnsName -Name www.kame.net
Write-Host "IPv4:" $DNS.IP4Address "`nIPv6:" $DNS.IP6Address
Python
>>> 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
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
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")
Raku
(formerly Perl 6)
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
REXX
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
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
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
import java.net._
InetAddress.getAllByName("www.kame.net").foreach(x => println(x.getHostAddress))
Scheme
; 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
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
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
Standard ML
The basis library provides IPv4 support only:
- Option.map (NetHostDB.toString o NetHostDB.addr) (NetHostDB.getByName "www.kame.net");
val it = SOME "203.178.141.194": string option
Tcl
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.
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
TXR
At the listener prompt:
This is the TXR Lisp interactive listener of TXR 283.
Quit with :quit or Ctrl-D on an empty line. Ctrl-X ? for cheatsheet.
TXR's no-spray organic production means every bug is carefully removed by hand.
1> (flow (getaddrinfo "www.kame.net") (mapcar .(str-addr)) uniq)
("210.155.141.200" "2001:2f0:0:8800::1:1" "2001:2f0:0:8800:226:2dff:fe0b:4311")
UNIX Shell
Using dig
Aamrun ~ % dig www.kame.net A www.kame.net AAAA +short
mango.itojun.org.
210.155.141.200
mango.itojun.org.
2001:2f0:0:8800:226:2dff:fe0b:4311
2001:2f0:0:8800::1:1
Aamrun ~ %
Using nslookup
Aamrun ~ % nslookup
> set q=AAAA
> www.kame.net
Server: 192.168.1.1
Address: 192.168.1.1#53
Non-authoritative answer:
www.kame.net canonical name = mango.itojun.org.
mango.itojun.org has AAAA address 2001:2f0:0:8800:226:2dff:fe0b:4311
mango.itojun.org has AAAA address 2001:2f0:0:8800::1:1
Authoritative answers can be found from:
> set q=A
> www.kame.net
Server: 192.168.1.1
Address: 192.168.1.1#53
Non-authoritative answer:
www.kame.net canonical name = mango.itojun.org.
Name: mango.itojun.org
Address: 210.155.141.200
> exit
Aamrun ~ %
VBScript
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,"$1")
End If
Loop
End Function
Call dns_query(WScript.Arguments(0),WScript.Arguments(1))
- Output:
F:\>cscript /nologo dns_query.vbs www.kame.net 4 URL: www.kame.net IP Version 4: 203.178.141.194 F:\>cscript /nologo dns_query.vbs www.kame.net 6 URL: www.kame.net IP Version 6: 2001:200:dff:fff1:216:3eff:feb1:44d7
V (Vlang)
import net
fn main() {
addr := 'www.kame.net:80'
@type := net.SocketType.tcp
family := net.AddrFamily.unspec
mut addrs := []net.Addr{}
mut results :=''
addrs = net.resolve_addrs(addr, family, @type) or {println('Error: nothing resolved') exit(1)}
for each in addrs {
results += '${addr.split(':')[0]} * ${each} * ${each.family()} * ${@type} \n'
}
println(results)
}- Output:
www.kame.net * 210.155.141.200:80 * ip * tcp www.kame.net * [2001:2f0:0:8800:226:2dff:fe0b:4311]:80 * ip6 * tcp www.kame.net * [2001:2f0:0:8800::1:1]:80 * ip6 * tcp
Wren
Wren CLI doesn't currently expose a way to make a DNS query.
However, if Wren is embedded in (say) a suitable Go program, then we can ask the latter to do it for us.
/* DNS_query.wren */
class Net {
foreign static lookupHost(host)
}
var host = "orange.kame.net"
var addrs = Net.lookupHost(host).split(", ")
System.print(addrs.join("\n"))
which we embed in the following Go program and run it:
/* go run DNS_query.go */
package main
import(
wren "github.com/crazyinfin8/WrenGo"
"net"
"strings"
)
type any = interface{}
func lookupHost(vm *wren.VM, parameters []any) (any, error) {
host := parameters[1].(string)
addrs, err := net.LookupHost(host)
if err != nil {
return nil, nil
}
return strings.Join(addrs, ", "), nil
}
func main() {
vm := wren.NewVM()
fileName := "DNS_query.wren"
methodMap := wren.MethodMap{"static lookupHost(_)": lookupHost}
classMap := wren.ClassMap{"Net": wren.NewClass(nil, nil, methodMap)}
module := wren.NewModule(classMap)
vm.SetModule(fileName, module)
vm.InterpretFile(fileName)
vm.Free()
}
- Output:
2001:200:dff:fff1:216:3eff:feb1:44d7 203.178.141.194
zkl
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"))Categories:
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