套接字connect（）总是成功（TCP over ActiveSync）

Question

I'm using TCP/IP over ActiveSync to connect from Windows CE device to Windows XP desktop. The WinSock connect() function always succeeds, no matter whether desktop server application is actually running.

The following simplified code demonstrates this issue:

#include "stdafx.h"
#include <Winsock2.h>

int _tmain(int argc, _TCHAR* argv[])
{
    const int Port = 5555;
    const char * HostName = "ppp_peer";  

    WSADATA wsadata;
    if (WSAStartup(MAKEWORD(1, 1), &wsadata) != 0)
        return 1;

    struct hostent * hp = gethostbyname(HostName);
    if (hp == NULL)
        return 1;

    struct sockaddr_in sockaddr;
    memset(&sockaddr, 0, sizeof(sockaddr));
    sockaddr.sin_family = AF_INET;
    sockaddr.sin_addr.s_addr = ((struct in_addr *)(hp->h_addr))->s_addr;
    sockaddr.sin_port = htons(Port);    

    int sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock == SOCKET_ERROR)
        return 1;

    int result = connect(sock, (struct sockaddr*)&sockaddr, sizeof(sockaddr));
    // result always 0 (success) here

    closesocket(sock);

    return 0;
} 

Is this a bug? If not, what is a correct way to determine that the server is actually online? Only to try to use the established connection (recv/send data)?

Device: Windows CE 5.0, WinSock 2.2; Desktop: Windows XP, SP3, ActiveSync 4.5.

Answer 1

从什么IIRC，还有在ActiveSync的错误，该WM 5.0认为它仍然最多连接Windows桌面电脑的ActiveSync服务器，在这里看到这个答案的SO这可能会提供线索和/或洞察到这一点，并能解释为什么socket连接总是成功...

Answer 2

So, I did not find the way to check if this is 'real' connection, other than to ignore this issue and try to use this connection. If it is not 'real', the communication will fail.