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原文出处：http://www.jianshu.com/p/c1344765805c
用Mac搭建NAT64模拟真实环境就不多介绍了，切记文件分享，VNC等服务关掉，重启，网上有很多教程，文章末尾可参考
！！！注意！！！
1、如果你用以太网共享网络数据、iOS终端上不了的话，请换用iphone 移动数据usb共享给Mac电脑测试，之前在这被坑了一把，切记！！！
2、Unity版本4.7.2f1以上
3、所有地方使用域名、使用域名、使用域名，不要用点分十进制IPv4地址或者IPv6十六进制地址，全部使用域名
4、服务器不用做处理，继续他的，上面的域名需要解析到对应的IP
附上代码(放在Assets\Plugins\iOS目录下)：
iOSHelper.h
@interface iOSHelper : NSObject
+(NSString *)_GetIPAddress : (const char *)host :(const char *)port;
@end
iOSHelper.mm
#import "iOSHelper.h"
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <err.h>
char* cStringCopy(const char* str)
{
if (str == NULL)
return NULL;
char *res = (char*)malloc(strlen(str)+1);
strcpy(res, str);
NSLog(@"PlatformHelper. GetIPAdderess : res = %s", res);
return res;
}
const char* _GetIPAddress(const char *host,const char *port)
{
if( NULL == host || NULL == port)
return NULL;
char ipbuf[256];
memset(ipbuf, 0, sizeof(ipbuf));
strcpy(ipbuf, host);
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
struct addrinfo* nextAddr = NULL;
struct addrinfo* resultAddr = NULL;
hints.ai_flags = AI_DEFAULT;
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
struct sockaddr_in6* addr6;
struct sockaddr_in* addr;
bool haveIpv4Addr = false;
int err = getaddrinfo(host, port, &hints, &resultAddr);
if(err != 0)
{
printf("getaddrinfo error: %s\n",gai_strerror(err));
return cStringCopy(ipbuf);
}
//Test Connect timeout, local network
struct timeval tv;
int optval;
int flags = 0;
fd_set rfds;
fd_set wfds;
socklen_t optlen;
int timeout = 3;
int result;
const char *cause = NULL;
int sock = -1;
for(nextAddr = resultAddr; nextAddr != NULL; nextAddr = nextAddr->ai_next)
{
sock = socket(nextAddr->ai_family, nextAddr->ai_socktype, nextAddr->ai_protocol);
if(sock < 0)
{
cause = "socket";
continue;
}
flags = fcntl(sock, F_GETFL, 0);
fcntl(sock, F_SETFL, flags | O_NONBLOCK);
result = connect(sock, nextAddr->ai_addr, nextAddr->ai_addrlen);
if (result == 0)
{
result = 1;
printf("connect success");
}
else if (result < 0 && errno != EINPROGRESS)
{
result = -1;
cause = "connect";
close(sock);
sock = -1;
continue;
}
else
{
do{
tv.tv_sec = timeout;
tv.tv_usec = 0;
FD_ZERO(&wfds);
FD_SET(sock, &wfds);
rfds = wfds;
result = select(sock + 1, &rfds, &wfds, NULL, &tv);
if (result == 0)
{
result = -1;
break;
}
if (result < 0 && errno != EINTR)
{
result = -1;
break;
}
else if (result > 0)
{
optlen = sizeof(int);
if (getsockopt(sock, SOL_SOCKET, SO_ERROR, (void *)(&optval), &optlen) < 0)
{
result = -1;
break;
}
if (optval != 0)
{
result = -1;
break;
}
result = 1;
break;
}
else{
result = -1;
break;
}
}
while (1);
if (0 >= result)
{
result = -1;
cause = "connect";
close(sock);
sock = -1;
continue;
}
else{
printf(" real connect success");
}
}
/*
if(connect(sock, nextAddr->ai_addr, nextAddr->ai_addrlen) < 0)
{
cause = "connect";
close(sock);
sock = -1;
continue;
}
*/
if (result > 0)
{
//网络可达
cause = "connected";
close(sock);
sock = -1;
}
//inet_ntop(nextAddr->ai_family, nextAddr->ai_addr, ipbuf, sizeof(ipbuf));
switch(nextAddr->ai_family)
{
case AF_UNSPEC:
break;
case AF_INET:
{
addr =( struct sockaddr_in*)nextAddr->ai_addr;
inet_ntop(AF_INET, &addr->sin_addr, ipbuf, sizeof(ipbuf));
}
break;
case AF_INET6:
{
addr6 =( struct sockaddr_in6*)nextAddr->ai_addr;
inet_ntop(AF_INET6, &addr6->sin6_addr, ipbuf, sizeof(ipbuf));
}
break;
default:
break;
}
break;//get addr
/*
switch(nextAddr->ai_family)
{
case AF_UNSPEC:
break;
case AF_INET:
{
addr =( struct sockaddr_in*)nextAddr->ai_addr;
inet_ntop(AF_INET, &addr->sin_addr, ipbuf, sizeof(ipbuf));
haveIpv4Addr = true;
}
break;
case AF_INET6:
{
addr6 =( struct sockaddr_in6*)nextAddr->ai_addr;
inet_ntop(AF_INET6, &addr6->sin6_addr, ipbuf, sizeof(ipbuf));
}
break;
default:
break;
}
if (haveIpv4Addr)
break;
*/
}
freeaddrinfo(resultAddr);
printf("getaddrinfo OK");
return cStringCopy(ipbuf);
}
Unity中CS代码：
PlatformHelper.cs
using UnityEngine;
using System.Collections;
using System.Runtime.InteropServices;
using Assets.Scripts.Common;
public class PlatformHelper : Singleton<PlatformHelper>
{
#if UNITY_IPHONE && !UNITY_EDITOR
[DllImport("__Internal")]
private static extern string _GetIPAddress(string host, string port);
#endif
public string GetIPAddress(string host, string port)
{
#if UNITY_IPHONE && !UNITY_EDITOR
return _GetIPAddress(host, port);
#else
return host;
#endif
}
}
顺便Singleton.cs单例模式也贴上：
public class Singleton<T> where T : class, new()
{
// 单件子类实例
private static T _instance;
protected Singleton()
{
}
/// <summary>
/// 获得类型的单件实例
/// </summary>
/// <returns>类型实例</returns>
public static T Instance()
{
if (null == _instance)
{
_instance = new T();
}
return _instance;
}
/// <summary>
/// 删除单件实例
/// </summary>
public static void DestroyInstance()
{
_instance = null;
}
}
socket连接的地方参考：
/// <summary>
/// 连接服务器，支持IPv4和IPv6
/// </summary>
/// <param name="server">服务器域名</param>
/// <param name="port">端口号</param>
public void ConnectSocket(string server, int port)
{
try
{
string newServerIP = server;
newServerIP = PlatformHelper.Instance().GetIPAddress(server, port.ToString());
IPAddress IPAddr = null;
if (!IPAddress.TryParse(newServerIP, out IPAddr))
{
//地址获取有问题，连接失败
return;
}
mSocket = new Socket(IPAddr.AddressFamily, SocketType.Stream, ProtocolType.Tcp); ;
mSendHead = mSendTail = 0;
mRecvHead = mRecvTail = 0;
mIsSending = mIsRecving = false;
mState = SocketState.StateConnecting;
ClearSocketErrorCode();
mSocket.BeginConnect(IPAddr, port, new AsyncCallback(ConnectComplete), null);
}
catch (System.Net.Sockets.SocketException ex)
{
SetErrorState(ex.SocketErrorCode);
}
}
参考如下：
1.http://www.codezeg.com/2016/06/14/ipv6/#section-3
2.http://www.codeinsect.net/blog/2016/05/26/unity-ipv6-socket-%E6%94%AF%E6%8C%81%EF%BC%8C%E5%B7%B2%E6%B5%8B%E8%AF%95%E9%80%9A%E8%BF%87/
3.http://blog.csdn.net/zhuweisky/article/details/8209040
4.https://developer.apple.com/library/content/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/UnderstandingandPreparingfortheIPv6Transition/UnderstandingandPreparingfortheIPv6Transition.html#//apple_ref/doc/uid/TP40010220-CH213-SW1
5.http://www.cnblogs.com/HemJohn/p/5590483.html
