C++ 套接字：在 Windows 中启用混杂模式

Question

我正在尝试修改我当前的套接字程序以捕获混杂的数据包。我目前拥有的是能够正常捕获数据包。我已经看到了如何在 Linux 上执行此操作的其他答案，但我需要找到一种在 Windows 上完成此操作的方法。

这是我的代码：

int main(int argc, char const *argv[])
{
    SOCKET s;                       //The bound socket
    struct sockaddr_in server;
    int recv_len;                   //Size of received data
    char udpbuf[BUFLEN];            //A buffer for the incoming data.
    float data;                     //The data in the packet

//Create a socket
if ((s = socket(AF_INET, SOCK_RAW, 0)) == INVALID_SOCKET)
{
    printf("Could not create socket : %d", WSAGetLastError());
}
printf("Socket created.\n");

//Prepare the sockaddr_in structure
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr(ADDR);
server.sin_port = htons(PORT);

//Bind socket to address
if (bind(s, (struct sockaddr *)&server, sizeof(server)) == SOCKET_ERROR)
{
    printf("Bind failed with error code : %d", WSAGetLastError());
    exit(EXIT_FAILURE);
}
puts("Bind done\n");

while (true)
{
    //Block statment. Code will wait until it detect packets.
    if ((recv_len = recvfrom(s, udpbuf, BUFLEN, 0, 0, 0)) == SOCKET_ERROR)
    {
        printf("recvfrom() failed with error code : %d", WSAGetLastError());
        exit(EXIT_FAILURE);
    }

return 0;
}

Answer 1

要在 Windows 上将套接字置于混杂模式，您需要调用 WSAIoCtl() 以向套接字发出 SIO_RCVALL control code。

int main(int argc, char const *argv[])
{
    WSADATA wsa;
    SOCKET s;                       //The bound socket
    struct sockaddr_in server;
    int recv_len;                   //Size of received data
    char udpbuf[BUFLEN];            //A buffer for the incoming data.

    //Initialize Winsock
    int err = WSAStartup(MAKEWORD(2,0), &wsa);
    if (err != 0)
    {
        printf("Could not initialize Winsock : %d", err);
        exit(EXIT_FAILURE);
    }

    //Create a socket
    if ((s = socket(AF_INET, SOCK_RAW, IPPROTO_IP)) == INVALID_SOCKET)
    {
        printf("Could not create socket : %d", WSAGetLastError());
        WSACleanup();
        exit(EXIT_FAILURE);
    }
    printf("Socket created.\n");

    //Prepare the sockaddr_in structure
    memset(&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = inet_addr(ADDR);
    server.sin_port = htons(PORT);

    //Bind socket to address
    if (bind(s, (struct sockaddr *)&server, sizeof(server)) == SOCKET_ERROR)
    {
        printf("Bind failed with error code : %d", WSAGetLastError());
        closesocket(s);
        WSACleanup();
        exit(EXIT_FAILURE);
    }
    puts("Bind done\n");

    // enable promiscuous mode
    DWORD dwValue = RCVALL_ON;
    DWORD dwBytesReturned = 0;
    if (WSAIoctl(s, SIO_RCVALL, &dwValue, sizeof(dwValue), NULL, 0, &dwBytesReturned, NULL, NULL) == SOCKET_ERROR)
    {
        printf("Ioctl failed with error code : %d", WSAGetLastError());
        closesocket(s);
        WSACleanup();
        exit(EXIT_FAILURE);
    }
    puts("Ioctl done\n");

    while (true)
    {
        //Block statment. Code will wait until it detect packets.
        if ((recv_len = recvfrom(s, udpbuf, BUFLEN, 0, 0, 0)) == SOCKET_ERROR)
        {
            printf("recvfrom() failed with error code : %d", WSAGetLastError());
            closesocket(s);
            WSACleanup();
            exit(EXIT_FAILURE);
        }
    }

    closesocket(s);
    WSACleanup();

    return 0;
}

另外，Microsoft 也有一个单独的Network Monitor API，它允许您在完全不使用 Winsock 的情况下监控和捕获网络流量。

Answer 2

我建议您使用 winpcap 库。请参阅 www.winpcap.org。 他们有关于如何做到这一点的综合文档和示例： https://www.winpcap.org/docs/docs_412/html/group__wpcap__tut3.html

例如Wireshark 在 windows 上使用 winpcap。