getnameinfo

関数

ソケットアドレスからホスト名とサービス名へ逆解決する。

DLLWS2_32.dll呼出規約winapiSetLastErrorあり対応OSWindows 8.1 以降

シグネチャ

// WS2_32.dll
#include <windows.h>

INT getnameinfo(
    const SOCKADDR* pSockaddr,
    socklen_t SockaddrLength,
    LPSTR pNodeBuffer,   // optional
    DWORD NodeBufferSize,
    LPSTR pServiceBuffer,   // optional
    DWORD ServiceBufferSize,
    INT Flags
);

パラメーター

名前	型	方向
pSockaddr	SOCKADDR*	in
SockaddrLength	socklen_t	in
pNodeBuffer	LPSTR	outoptional
NodeBufferSize	DWORD	in
pServiceBuffer	LPSTR	outoptional
ServiceBufferSize	DWORD	in
Flags	INT	in

戻り値の型: INT

各言語での呼び出し定義

// WS2_32.dll
#include <windows.h>

INT getnameinfo(
    const SOCKADDR* pSockaddr,
    socklen_t SockaddrLength,
    LPSTR pNodeBuffer,   // optional
    DWORD NodeBufferSize,
    LPSTR pServiceBuffer,   // optional
    DWORD ServiceBufferSize,
    INT Flags
);

[DllImport("WS2_32.dll", SetLastError = true, ExactSpelling = true)]
static extern int getnameinfo(
    IntPtr pSockaddr,   // SOCKADDR*
    int SockaddrLength,   // socklen_t
    [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pNodeBuffer,   // LPSTR optional, out
    uint NodeBufferSize,   // DWORD
    [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pServiceBuffer,   // LPSTR optional, out
    uint ServiceBufferSize,   // DWORD
    int Flags   // INT
);

<DllImport("WS2_32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function getnameinfo(
    pSockaddr As IntPtr,   ' SOCKADDR*
    SockaddrLength As Integer,   ' socklen_t
    <MarshalAs(UnmanagedType.LPStr)> pNodeBuffer As System.Text.StringBuilder,   ' LPSTR optional, out
    NodeBufferSize As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> pServiceBuffer As System.Text.StringBuilder,   ' LPSTR optional, out
    ServiceBufferSize As UInteger,   ' DWORD
    Flags As Integer   ' INT
) As Integer
End Function

' pSockaddr : SOCKADDR*
' SockaddrLength : socklen_t
' pNodeBuffer : LPSTR optional, out
' NodeBufferSize : DWORD
' pServiceBuffer : LPSTR optional, out
' ServiceBufferSize : DWORD
' Flags : INT
Declare PtrSafe Function getnameinfo Lib "ws2_32" ( _
    ByVal pSockaddr As LongPtr, _
    ByVal SockaddrLength As Long, _
    ByVal pNodeBuffer As String, _
    ByVal NodeBufferSize As Long, _
    ByVal pServiceBuffer As String, _
    ByVal ServiceBufferSize As Long, _
    ByVal Flags As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

getnameinfo = ctypes.windll.ws2_32.getnameinfo
getnameinfo.restype = ctypes.c_int
getnameinfo.argtypes = [
    ctypes.c_void_p,  # pSockaddr : SOCKADDR*
    ctypes.c_int,  # SockaddrLength : socklen_t
    wintypes.LPSTR,  # pNodeBuffer : LPSTR optional, out
    wintypes.DWORD,  # NodeBufferSize : DWORD
    wintypes.LPSTR,  # pServiceBuffer : LPSTR optional, out
    wintypes.DWORD,  # ServiceBufferSize : DWORD
    ctypes.c_int,  # Flags : INT
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
getnameinfo = Fiddle::Function.new(
  lib['getnameinfo'],
  [
    Fiddle::TYPE_VOIDP,  # pSockaddr : SOCKADDR*
    Fiddle::TYPE_INT,  # SockaddrLength : socklen_t
    Fiddle::TYPE_VOIDP,  # pNodeBuffer : LPSTR optional, out
    -Fiddle::TYPE_INT,  # NodeBufferSize : DWORD
    Fiddle::TYPE_VOIDP,  # pServiceBuffer : LPSTR optional, out
    -Fiddle::TYPE_INT,  # ServiceBufferSize : DWORD
    Fiddle::TYPE_INT,  # Flags : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "ws2_32")]
extern "system" {
    fn getnameinfo(
        pSockaddr: *const SOCKADDR,  // SOCKADDR*
        SockaddrLength: i32,  // socklen_t
        pNodeBuffer: *mut u8,  // LPSTR optional, out
        NodeBufferSize: u32,  // DWORD
        pServiceBuffer: *mut u8,  // LPSTR optional, out
        ServiceBufferSize: u32,  // DWORD
        Flags: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern int getnameinfo(IntPtr pSockaddr, int SockaddrLength, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pNodeBuffer, uint NodeBufferSize, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pServiceBuffer, uint ServiceBufferSize, int Flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_getnameinfo' -Namespace Win32 -PassThru
# $api::getnameinfo(pSockaddr, SockaddrLength, pNodeBuffer, NodeBufferSize, pServiceBuffer, ServiceBufferSize, Flags)

#uselib "WS2_32.dll"
#func global getnameinfo "getnameinfo" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; getnameinfo varptr(pSockaddr), SockaddrLength, varptr(pNodeBuffer), NodeBufferSize, varptr(pServiceBuffer), ServiceBufferSize, Flags   ; 戻り値は stat
; pSockaddr : SOCKADDR* -> "sptr"
; SockaddrLength : socklen_t -> "sptr"
; pNodeBuffer : LPSTR optional, out -> "sptr"
; NodeBufferSize : DWORD -> "sptr"
; pServiceBuffer : LPSTR optional, out -> "sptr"
; ServiceBufferSize : DWORD -> "sptr"
; Flags : INT -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

出力引数:

#uselib "WS2_32.dll"
#cfunc global getnameinfo "getnameinfo" var, int, var, int, var, int, int
; res = getnameinfo(pSockaddr, SockaddrLength, pNodeBuffer, NodeBufferSize, pServiceBuffer, ServiceBufferSize, Flags)
; pSockaddr : SOCKADDR* -> "var"
; SockaddrLength : socklen_t -> "int"
; pNodeBuffer : LPSTR optional, out -> "var"
; NodeBufferSize : DWORD -> "int"
; pServiceBuffer : LPSTR optional, out -> "var"
; ServiceBufferSize : DWORD -> "int"
; Flags : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。#uselib "WS2_32.dll"
#cfunc global getnameinfo "getnameinfo" sptr, int, sptr, int, sptr, int, int
; res = getnameinfo(varptr(pSockaddr), SockaddrLength, varptr(pNodeBuffer), NodeBufferSize, varptr(pServiceBuffer), ServiceBufferSize, Flags)
; pSockaddr : SOCKADDR* -> "sptr"
; SockaddrLength : socklen_t -> "int"
; pNodeBuffer : LPSTR optional, out -> "sptr"
; NodeBufferSize : DWORD -> "int"
; pServiceBuffer : LPSTR optional, out -> "sptr"
; ServiceBufferSize : DWORD -> "int"
; Flags : INT -> "int"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; INT getnameinfo(SOCKADDR* pSockaddr, socklen_t SockaddrLength, LPSTR pNodeBuffer, DWORD NodeBufferSize, LPSTR pServiceBuffer, DWORD ServiceBufferSize, INT Flags)
#uselib "WS2_32.dll"
#cfunc global getnameinfo "getnameinfo" var, int, var, int, var, int, int
; res = getnameinfo(pSockaddr, SockaddrLength, pNodeBuffer, NodeBufferSize, pServiceBuffer, ServiceBufferSize, Flags)
; pSockaddr : SOCKADDR* -> "var"
; SockaddrLength : socklen_t -> "int"
; pNodeBuffer : LPSTR optional, out -> "var"
; NodeBufferSize : DWORD -> "int"
; pServiceBuffer : LPSTR optional, out -> "var"
; ServiceBufferSize : DWORD -> "int"
; Flags : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。; INT getnameinfo(SOCKADDR* pSockaddr, socklen_t SockaddrLength, LPSTR pNodeBuffer, DWORD NodeBufferSize, LPSTR pServiceBuffer, DWORD ServiceBufferSize, INT Flags)
#uselib "WS2_32.dll"
#cfunc global getnameinfo "getnameinfo" intptr, int, intptr, int, intptr, int, int
; res = getnameinfo(varptr(pSockaddr), SockaddrLength, varptr(pNodeBuffer), NodeBufferSize, varptr(pServiceBuffer), ServiceBufferSize, Flags)
; pSockaddr : SOCKADDR* -> "intptr"
; SockaddrLength : socklen_t -> "int"
; pNodeBuffer : LPSTR optional, out -> "intptr"
; NodeBufferSize : DWORD -> "int"
; pServiceBuffer : LPSTR optional, out -> "intptr"
; ServiceBufferSize : DWORD -> "int"
; Flags : INT -> "int"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procgetnameinfo = ws2_32.NewProc("getnameinfo")
)

// pSockaddr (SOCKADDR*), SockaddrLength (socklen_t), pNodeBuffer (LPSTR optional, out), NodeBufferSize (DWORD), pServiceBuffer (LPSTR optional, out), ServiceBufferSize (DWORD), Flags (INT)
r1, _, err := procgetnameinfo.Call(
	uintptr(pSockaddr),
	uintptr(SockaddrLength),
	uintptr(pNodeBuffer),
	uintptr(NodeBufferSize),
	uintptr(pServiceBuffer),
	uintptr(ServiceBufferSize),
	uintptr(Flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function getnameinfo(
  pSockaddr: Pointer;   // SOCKADDR*
  SockaddrLength: Integer;   // socklen_t
  pNodeBuffer: PAnsiChar;   // LPSTR optional, out
  NodeBufferSize: DWORD;   // DWORD
  pServiceBuffer: PAnsiChar;   // LPSTR optional, out
  ServiceBufferSize: DWORD;   // DWORD
  Flags: Integer   // INT
): Integer; stdcall;
  external 'WS2_32.dll' name 'getnameinfo';

result := DllCall("WS2_32\getnameinfo"
    , "Ptr", pSockaddr   ; SOCKADDR*
    , "Int", SockaddrLength   ; socklen_t
    , "Ptr", pNodeBuffer   ; LPSTR optional, out
    , "UInt", NodeBufferSize   ; DWORD
    , "Ptr", pServiceBuffer   ; LPSTR optional, out
    , "UInt", ServiceBufferSize   ; DWORD
    , "Int", Flags   ; INT
    , "Int")   ; return: INT

●getnameinfo(pSockaddr, SockaddrLength, pNodeBuffer, NodeBufferSize, pServiceBuffer, ServiceBufferSize, Flags) = DLL("WS2_32.dll", "int getnameinfo(void*, int, char*, dword, char*, dword, int)")
# 呼び出し: getnameinfo(pSockaddr, SockaddrLength, pNodeBuffer, NodeBufferSize, pServiceBuffer, ServiceBufferSize, Flags)
# pSockaddr : SOCKADDR* -> "void*"
# SockaddrLength : socklen_t -> "int"
# pNodeBuffer : LPSTR optional, out -> "char*"
# NodeBufferSize : DWORD -> "dword"
# pServiceBuffer : LPSTR optional, out -> "char*"
# ServiceBufferSize : DWORD -> "dword"
# Flags : INT -> "int"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。