什么是Windows XP等效的inet_pton或InetPton？ [英] What is the Windows XP equivalent of inet_pton or InetPton?

问题描述

我需要确定特定字符串是否是有效的IPv4或IPv6地址文字。如果我理解正确，在POSIX系统上执行此操作的正确方法是使用 inet_pton 将其转换为网络地址结构并查看是否成功。 Windows Vista及更高版本具有 InetPton ，这基本上是相同的。但据我所知，Windows XP并未声明其中任何一种，我需要能够在XP上正确执行此操作。那么，问题是使用什么系统函数来做到这一点？

I need to determine whether a particular string is a valid IPv4 or IPv6 address literal. If I understand correctly, the correct way to do this on POSIX systems is to use inet_pton to convert it into a network address structure and see if it succeeds. Windows Vista and later have InetPton which does essentially the same thing. But as far as I can tell, Windows XP doesn't declare either of those, and I need to be able to do this correctly on XP. So, the question is what system function to use to do this?

最坏的情况，我可以编写一个函数自己解析它，但我更喜欢标准，因此，系统功能已经过彻底测试并能正确处理所有角落情况等等。已经很糟糕的是，微软不能像其他人一样宣布 inet_pton ，并为新的操作系统选择了 InetPton 。

Worst case, I can write a function to parse it myself, but I'd prefer a standard, system function which has therefore been thoroughly tested and properly handles all corner cases and whatnot. It's already bad enough that Microsoft couldn't just declare inet_pton like everyone else and went with InetPton for their newer OSes.

推荐答案

在Windows XP中，您可以使用以下功能：

In windows XP you can use these functions:

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#include <winsock2.h>
#include <ws2tcpip.h>


int inet_pton(int af, const char *src, void *dst)
{
  struct sockaddr_storage ss;
  int size = sizeof(ss);
  char src_copy[INET6_ADDRSTRLEN+1];

  ZeroMemory(&ss, sizeof(ss));
  /* stupid non-const API */
  strncpy (src_copy, src, INET6_ADDRSTRLEN+1);
  src_copy[INET6_ADDRSTRLEN] = 0;

  if (WSAStringToAddress(src_copy, af, NULL, (struct sockaddr *)&ss, &size) == 0) {
    switch(af) {
      case AF_INET:
    *(struct in_addr *)dst = ((struct sockaddr_in *)&ss)->sin_addr;
    return 1;
      case AF_INET6:
    *(struct in6_addr *)dst = ((struct sockaddr_in6 *)&ss)->sin6_addr;
    return 1;
    }
  }
  return 0;
}

const char *inet_ntop(int af, const void *src, char *dst, socklen_t size)
{
  struct sockaddr_storage ss;
  unsigned long s = size;

  ZeroMemory(&ss, sizeof(ss));
  ss.ss_family = af;

  switch(af) {
    case AF_INET:
      ((struct sockaddr_in *)&ss)->sin_addr = *(struct in_addr *)src;
      break;
    case AF_INET6:
      ((struct sockaddr_in6 *)&ss)->sin6_addr = *(struct in6_addr *)src;
      break;
    default:
      return NULL;
  }
  /* cannot direclty use &size because of strict aliasing rules */
  return (WSAAddressToString((struct sockaddr *)&ss, sizeof(ss), NULL, dst, &s) == 0)?
          dst : NULL;
}

就是这样。与ws2_32库链接。

That's it. Link with ws2_32 library.

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