getpeername sa_data

时间:2010-08-04 03:51:25

标签: c++ sockets

我想获取连接到服务器套接字的套接字的IP地址。我已经包含了我的代码。

sa_data不返回“xxx.xxx.xxx.xxx”类型的char [14]。相反,它返回[11][1][xxx][xxx][xxx][xxx][][][][][][][]...[]。有人可以帮忙吗?

int InitialResult;
char SendMessage[1024];
char ReceiveMessage[1024];
WSADATA WSAData;
addrinfo Hints;
addrinfo *Result;
SOCKET ListenSocket;
SOCKET ClientSocket;

ZeroMemory(&Hints, sizeof(Hints));
Hints.ai_family = AF_INET;
Hints.ai_socktype = SOCK_STREAM;
Hints.ai_protocol = IPPROTO_TCP;
Hints.ai_flags = AI_PASSIVE;
while(1)
{
    InitialResult = WSAStartup(MAKEWORD(2,2), &WSAData);
    if (InitialResult != 0)
    {
        cout << "WSA start up failed.";
    }
    InitialResult = getaddrinfo(NULL, portnumber, &Hints, &Result);
    if (InitialResult != 0)
    {
        cout << "Get address information failed.";
        WSACleanup();
    }
    ListenSocket = socket(Result->ai_family, Result->ai_socktype, Result->ai_protocol);
    if (ListenSocket == INVALID_SOCKET)
    {
        cout << "Socket initialization failed.";
        WSACleanup();
    }
    InitialResult = bind(ListenSocket, Result->ai_addr, (int)Result->ai_addrlen);
    if (InitialResult == SOCKET_ERROR)
    {
        cout << "Bind failed." << portnumber;
        closesocket(ListenSocket);
        ListenSocket = INVALID_SOCKET;
        WSACleanup();
    }
    InitialResult = listen(ListenSocket, SOMAXCONN);
    if (InitialResult == SOCKET_ERROR)
    {
        cout << "Listen failed." << portnumber;
        closesocket(ListenSocket);
        ListenSocket = INVALID_SOCKET;
        WSACleanup();
    }
    ClientSocket = accept(ListenSocket, NULL, NULL);
    if (ClientSocket == INVALID_SOCKET)
    {
        cout << "Socket accept failed." << portnumber;
        WSACleanup();
    }

    sockaddr test;
    int a = sizeof(test);
    cout << "getpeername() return value : " << getpeername(ClientSocket, &test, &a) << endl;
    cout << "test.sa_data : " << test.sa_data;


    StartReceive(ReceiveMessage, ClientSocket);
    strcpy(SendMessage,"Congratulations!! You have successfully transfered some data to G DA.");
    StartSend(SendMessage, ClientSocket);
    StartSend(portnumber, ClientSocket);
    InitialResult = shutdown(ClientSocket, SD_SEND);
    if (InitialResult == SOCKET_ERROR)
    {
        cout << "Shut down failed." << portnumber;
        closesocket(ClientSocket);
        WSACleanup();
    }
    closesocket(ClientSocket);
    closesocket(ListenSocket);
    WSACleanup();
}

3 个答案:

答案 0 :(得分:2)

accept(2)的第二和第三个参数允许您在不额外调用getpeername(2)的情况下获取该信息。然后,您需要使用inet_ntoa(3)之类的内容将二进制地址转换为字符串表示

答案 1 :(得分:1)

为什么您认为WSADATA应该是char [14]?这是一个struct,如图所示在these docs

顺便说一句,在您检查的各种错误情况下,您应该终止整个函数(例如使用return),而您正在做的事情似乎只是在一些消息之后继续使用结构&amp; c已知无效...

修改:哦,我知道,当你说sa_data时,你的意思是test.sa_data,另一个答案解释了为什么它不是你所期望的。无论如何都要留下这个答案,因为至少第二段非常重要(并且仍然相关; - )。

答案 2 :(得分:0)

  

sa_data不返回char [14]   类型“xxx.xxx.xxx.xxx”

没有指定这样做,所以难怪它不会。

您需要查看sockaddr_in和sockaddr_in6。