Unity IPv6 Socket 支持

Unity IPv6 几点注意事项：

1.unity版本： 5.3.4 P4

2.服务器IP地址 需要通过 IOS原生代码 getaddrinfo 做转换

3.socket.LocalEndPoint socket.RemoteEndPoint （IPv6环境 访问这两个变量会报异常，需要做特殊处理）

4. 第二个参数 一定要传 “http” 否则连接外网 会有异常

1	error = getaddrinfo(ipv4_str, "http", &hints, &res0);

5.IOS9.2及以后的版本才支持IPv6（这个一定要注意）

Apple如何审核支持IPV6-Only？

首先第一点：这里说的支持IPV6-Only网络，其实就是说让应用在 IPv6 DNS64/NAT64 网络环境下仍然能够正常运行。但是考虑到我们目前的实际网络环境仍然是IPV4网络，所以应用需要能够同时保证IPV4和IPV6环境下的可用性。从这点来说，苹果不会去扫描IPV4的专有API来拒绝审核通过，因为IPV4的API和IPV6的API调用都会同时存在于代码中。其次第二点：Apple官方声明iOS9开始向IPV6支持过渡，在iOS9.2+支持IPV4地址合成IPV6地址。其提供的Reachability库在iOS8系统下，当从IPV4切换到IPV6网络，或者从IPV6网络切换到IPV4，是无法监控到网络状态的变化。也有一些开发者针对这些Bug询问Apple的审核部门，给予的答复是只需要在苹果最新的系统上保证IPV6的兼容性即可。最后第三点：只要应用的主流程支持IPV6，通过苹果审核即可。对于不支持IPV6的模块，考虑到我们现实IPV6网络的部署还需要一段时间，短时间内不会影响我们用户的使用。但随着4G网络IPV6的部署，这部分模块还是需要逐渐安排人力进行支持。IOS IPv6 官方说明文档：https://developer.apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/UnderstandingandPreparingfortheIPv6Transition/UnderstandingandPreparingfortheIPv6Transition.html#//apple_ref/doc/uid/TP40010220-CH213-SW1把源码给大家贴出来（代码写的比较乱，请大家多多包涵）：IOS代码 .h 文件

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@interface BundleId : NSObject +(NSString *)getIPv6 : (const char *)mHost :(const char *)mPort; @end

IOS代码 .m文件

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#import "BundleId.h"#include <sys/socket.h>#include <netdb.h>#include <arpa/inet.h>#include <err.h> #define MakeStringCopy( _x_ ) ( _x_ != NULL && [_x_ isKindOfClass:[NSString class]] ) ? strdup( [_x_ UTF8String] ) : NULL const char* getIPv6(const char *mHost,const char *mPort){ if( nil == mHost ) return NULL; const char *newChar = "No"; const char *cause = NULL; struct addrinfo* res0; struct addrinfo hints; struct addrinfo* res; int n, s; memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_DEFAULT; hints.ai_family = PF_UNSPEC; hints.ai_socktype = SOCK_STREAM; if((n=getaddrinfo(mHost, "http", &hints, &res0))!=0) { printf("getaddrinfo error: %s\n",gai_strerror(n)); return NULL; } struct sockaddr_in6* addr6; struct sockaddr_in* addr; NSString * NewStr = NULL; char ipbuf[32]; s = -1; for(res = res0; res; res = res->ai_next) { if (res->ai_family == AF_INET6) { addr6 =( struct sockaddr_in6*)res->ai_addr; newChar = inet_ntop(AF_INET6, &addr6->sin6_addr, ipbuf, sizeof(ipbuf)); NSString * TempA = [[NSString alloc] initWithCString:(const char*)newChar encoding:NSASCIIStringEncoding]; NSString * TempB = [NSString stringWithUTF8String:"&&ipv6"]; NewStr = [TempA stringByAppendingString: TempB]; printf("%s\n", newChar); } else { addr =( struct sockaddr_in*)res->ai_addr; newChar = inet_ntop(AF_INET, &addr->sin_addr, ipbuf, sizeof(ipbuf)); NSString * TempA = [[NSString alloc] initWithCString:(const char*)newChar encoding:NSASCIIStringEncoding]; NSString * TempB = [NSString stringWithUTF8String:"&&ipv4"]; NewStr = [TempA stringByAppendingString: TempB]; printf("%s\n", newChar); } break; } freeaddrinfo(res0); printf("getaddrinfo OK"); NSString * mIPaddr = NewStr; return MakeStringCopy(mIPaddr);}

Unity C#代码

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[DllImport("__Internal")] private static extern string getIPv6(string mHost, string mPort); //"192.168.1.1&&ipv4" public static string GetIPv6(string mHost, string mPort) { #if UNITY_IPHONE && !UNITY_EDITOR string mIPv6 = getIPv6(mHost, mPort); return mIPv6; #else return mHost + "&&ipv4"; #endif } void getIPType(String serverIp, String serverPorts, out String newServerIp, out AddressFamily mIPType) { mIPType = AddressFamily.InterNetwork; newServerIp = serverIp; try { string mIPv6 = GetIPv6(serverIp, serverPorts); if (!string.IsNullOrEmpty(mIPv6)) { string[] m_StrTemp = System.Text.RegularExpressions.Regex.Split(mIPv6, "&&"); if (m_StrTemp != null && m_StrTemp.Length >= 2) { string IPType = m_StrTemp[1]; if (IPType == "ipv6") { newServerIp = m_StrTemp[0]; mIPType = AddressFamily.InterNetworkV6; } } } } catch (Exception e) { ClientLog.Instance.Log("GetIPv6 error:" + e); } } public SocketClient(String serverIp, String serverPorts) { String newServerIp = ""; AddressFamily newAddressFamily = AddressFamily.InterNetwork; getIPType(serverIp, serverPorts, out newServerIp, out newAddressFamily); if (!string.IsNullOrEmpty(newServerIp)){ serverIp = newServerIp;} socketClient = new Socket(newAddressFamily, SocketType.Stream, ProtocolType.Tcp); ClientLog.Instance.Log("Socket AddressFamily :" + newAddressFamily.ToString() + "ServerIp:" + serverIp); }