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蘋果要求在2016年6月1日后新的app必須支持ipv6網(wǎng)絡(luò), 技術(shù)發(fā)展靠蘋果果然沒錯(cuò), 但開發(fā)者還是要開始忙起來了
這里介紹下Unity3D的適配的一些經(jīng)驗(yàn)

基本注意點(diǎn)

• ios ipv6適配無需修改服務(wù)器, 也就是說, 如果你的服務(wù)器依然是ipv4的也是可以使用的
• 蘋果的適配方案是將ipv4的地址轉(zhuǎn)換為ipv6, 到了路由層再轉(zhuǎn)回去繼續(xù)利用ipv4網(wǎng)絡(luò)傳輸

測(cè)試網(wǎng)絡(luò)環(huán)境搭建

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網(wǎng)上有很多翻譯了蘋果官方的搭建ipv6測(cè)試網(wǎng)絡(luò)環(huán)境的文章, 例如:
http://www.cocoachina.com/ios/20160525/16431.html
注意以下幾點(diǎn)

• 無需路由器支持ipv6, 但貓(modem)必須要支持ipv6. 因?yàn)楝F(xiàn)在大多數(shù)都是光貓
  以下截圖是光貓管理端
  
  光貓里的ipv6支持默認(rèn)是關(guān)閉的, 所以需要手動(dòng)打開, 按默認(rèn)值配置即可

• 請(qǐng)確認(rèn)mac os系統(tǒng)必須是osx 10.11以后的版本才可以打開NAT64

• 正確連接mac的ios設(shè)備應(yīng)是如下截圖示意
  

• 默認(rèn)連接上wifi時(shí)看連接信息時(shí), 一般只會(huì)有紅色DNS地址或者根本不顯示
• 只有在第一次訪問網(wǎng)絡(luò), 例如打開瀏覽器進(jìn)入任意網(wǎng)站時(shí), 才會(huì)顯示上面的幾條信息
• 如果只有DNS沒有IP地址和子網(wǎng)掩碼, 一般是光貓沒有打開ipv6的DHCP, 沒有分配IP
• 還有一種測(cè)試ipv6 DHCP是否正常工作的方法: 關(guān)閉NAT64時(shí)可以上網(wǎng), 但打開NAT64無法上網(wǎng)

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Unity3D的Socket適配

WWW類本身已經(jīng)支持了IPV6, 無需處理, 這里講解使用C#原生Socket的處理

• 測(cè)試用的設(shè)備的iOS版本必須是9.3以上的
• Socket構(gòu)造時(shí), AddressFamily 設(shè)置為InterNetworkV6時(shí)只支持ipv6網(wǎng)絡(luò), 傳入InterNetwork時(shí)只支持ipv4網(wǎng)絡(luò)

• 4.7.2和5.4.3的當(dāng)前版本在mono層并未支持ipv6代碼適配的核心函數(shù)getaddrinfo, 因此需要通過oc層做轉(zhuǎn)換, 以下是代碼
  這段代碼將getaddrinfo的地址轉(zhuǎn)換成一個(gè)完整字符串, 格式是:
  ipv4|ipv4地址|ipv6|ipv6地址|

P.S. copyStr這種用法參考了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/
會(huì)造成內(nèi)存泄露, 如果有更好的方法歡迎反饋

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iosaddrinfo.mm

   1:  #include <sys/socket.h>
   2:  #include <netdb.h>
   3:  #include <arpa/inet.h>
   4:  #include <err.h>
   5:  #define OUTSTR_SIZE 4096
   6:  extern "C"
   7:  {
   8:      const char* copyStr( const char* str )
   9:      {
  10:          char* s = (char*)malloc(strlen(str) + 1);
  11:          strcpy(s, str);
  12:          return s;
  13:      }
  14:      const char* IOSGetAddressInfo(const char *host )
  15:      {
  16:          if( NULL == host )
  17:              return copyStr("ERROR_HOSTNULL");
  18:          char outstr[OUTSTR_SIZE];
  19:          struct addrinfo hints, *res, *res0;
  20:          memset(&hints, 0, sizeof(hints));
  21:          hints.ai_family = PF_UNSPEC;
  22:          hints.ai_socktype = SOCK_STREAM;
  23:          hints.ai_flags = AI_DEFAULT;
  24:          printf("getaddrinfo: %s\n", host);
  25:          int error = getaddrinfo(host, "http", &hints, &res0);
  26:          if (error != 0 )
  27:          {
  28:              printf("getaddrinfo: %s\n", gai_strerror(error));
  29:              return copyStr("ERROR_GETADDR");
  30:          }
  31:          memset( outstr, 0, sizeof(char)*OUTSTR_SIZE );
  32:          struct sockaddr_in6* addr6;
  33:          struct sockaddr_in* addr;
  34:          const char* solvedaddr;
  35:          char ipbuf[32];
  36:          for (res = res0; res; res = res->ai_next)
  37:          {
  38:              if (res->ai_family == AF_INET6)
  39:              {
  40:                  addr6 =( struct sockaddr_in6*)res->ai_addr;
  41:                  solvedaddr = inet_ntop(AF_INET6, &addr6->sin6_addr, ipbuf, sizeof(ipbuf));
  42:                  strcat ( outstr, "ipv6|");
  43:                  strcat ( outstr, solvedaddr);
  44:              }
  45:              else
  46:              {
  47:                  addr =( struct sockaddr_in*)res->ai_addr;
  48:                  solvedaddr = inet_ntop(AF_INET, &addr->sin_addr, ipbuf, sizeof(ipbuf));
  49:                  strcat ( outstr, "ipv4|");
  50:                  strcat ( outstr, solvedaddr);
  51:              }
  52:              strcat ( outstr, "|");
  53:          }
  54:          return copyStr(outstr);
  55:      }
  56:  }
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iosaddrinfo.h

   1:  #pragma once
   2:  extern "C"{
   3:      const char* IOSGetAddressInfo(const char *host );
   4:  }

• C#層的處理假設(shè)多個(gè)地址中都是統(tǒng)一的地址類型,要么全是v4要么全是v6
  返回給定的host內(nèi)多個(gè)IP地址, 可以供處理復(fù)雜的北網(wǎng)通,南電信問題

   1:  using System;
   2:  using System.Net;
   3:  using System.Net.Sockets;
   4:  using System.Runtime.InteropServices;
   5:  using UnityEngine;
   6:  using System.Collections;
   7:  using System.Collections.Generic;
   8:  public class IOSIPV6
   9:  {
  10:      [DllImport("__Internal")]
  11:      private static extern string IOSGetAddressInfo(string host );  
  12:      public static IPAddress[] ResolveIOSAddress(string host, out AddressFamily af)
  13:      {
  14:          af = AddressFamily.InterNetwork;
  15:          var outstr = IOSGetAddressInfo(host);
  16:          Debug.Log("IOSGetAddressInfo: " + outstr);
  17:          if (outstr.StartsWith ("ERROR")) 
  18:          {
  19:              return null;
  20:          }
  21:          var addressliststr = outstr.Split('|');
  22:          var addrlist = new List<IPAddress>();
  23:          foreach (string s in addressliststr)
  24:          {
  25:              if (String.IsNullOrEmpty(s.Trim()))
  26:                  continue;
  27:              switch( s )
  28:              {
  29:                  case "ipv6":
  30:                      {                        
  31:                          af = AddressFamily.InterNetworkV6;
  32:                      }
  33:                      break;
  34:                  case "ipv4":
  35:                      {
  36:                          af = AddressFamily.InterNetwork;
  37:                      }
  38:                      break;
  39:                  default:
  40:                      {
  41:                          addrlist.Add(IPAddress.Parse(s));
  42:                      }
  43:                      break;
  44:              }
  45:          }
  46:          return addrlist.ToArray();
  47:      }
  48:  }
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參考鏈接

官方文檔
https://developer.apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/UnderstandingandPreparingfortheIPv6Transition/UnderstandingandPreparingfortheIPv6Transition.html#//apple_ref/doc/uid/TP40010220-CH213-SW1

某人的解決方案
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/
注意, 此方案中的方法可用, 但是地址并不能解決南北互通的問題