socket支持ipv6

转自：https://www.jianshu.com/p/9926b99a7fef

以前cocos2d-x的项目里都使用的是libwebsocket，如果想支持ipv6，只需要升级相应的库即可，现在有个项目里使用的是原生socket，如果要支持ipv6可能需要进行一些代码的改造，具体可参考如下代码：

struct addrinfo *result;

struct addrinfo *res;

struct addrinfo addrCriteria;

memset(&addrCriteria,,sizeof(addrCriteria));

addrCriteria.ai_family=AF_UNSPEC;

addrCriteria.ai_socktype=SOCK_STREAM;

addrCriteria.ai_protocol=IPPROTO_TCP;

//判定网络类型    指定特定接口信息

int error = getaddrinfo("www.baidu.com", "", &addrCriteria, &result);

if (error == )

{

    struct sockaddr_in *sa;

    for (res = result; res != NULL; res = res->ai_next)

    {

        if (AF_INET6 == res->ai_addr->sa_family)

        {

            char buf[] = {};

            sa = (struct sockaddr_in*)res->ai_addr;

            inet_ntop(AF_INET6, &((reinterpret_cast<struct sockaddr_in6*>(sa))->sin6_addr), buf, );

            m_sock = socket(res->ai_family, res->ai_socktype, );

            if (m_sock == -) {

                log("error socket create");

                return;

            }

            struct sockaddr_in6 svraddr;

            memset(&svraddr, , sizeof(svraddr)); //注意初始化

            svraddr.sin6_family = AF_INET6;

            svraddr.sin6_port = htons(port);

            if (inet_pton(AF_INET6,buf,&svraddr.sin6_addr) < )

            {

                log("error addr");

            }

            int ret = connect(m_sock, (struct sockaddr*) &svraddr, sizeof(svraddr));

            //TODO....遇到IPv6就退出

            break;

        }

        else if (AF_INET == res->ai_addr->sa_family)

        {

            char buf[] = {};

            sa = (struct sockaddr_in*)res->ai_addr;

            inet_ntop(AF_INET, &sa->sin_addr), buf, );

            m_sock = socket(res->ai_family, res->ai_socktype, );

            if (m_sock == -) {

                log("error socket create");

                return;

            }

            struct sockaddr_in svraddr;

            svraddr.sin_family = AF_INET;

            svraddr.sin_addr.s_addr = inet_addr(buf);

            svraddr.sin_port = htons(port);

            int ret = connect(m_sock, (struct sockaddr*) &svraddr, sizeof(svraddr));

            //TODO.... break除掉

            //break;

        }

    }

}