我正在尝试使用 TCP 将客户端连接到服务器。我想我的客户正确地完成了他的工作，但服务器无法接受连接。 这是我的代码:

服务器:

int main(int argc, char *argv[])
{
    int port, sock, newsock, thread_pool_size, queue_size;
    struct sockaddr_in server, client;
    struct sockaddr *serverptr = ( struct sockaddr * )&server;
    struct sockaddr *clientptr = ( struct sockaddr * )&client;
    struct hostent *rem;
    socklen_t clientlen;
    pthread_t thr;
    int i, err, status;

    if(argc != 7)
    {
        printf("Usage: ./dataServer -p <port> -s <thread_pool_size> -q <queue_size>\n");
        exit(1);
    }

    for(i=1; i<argc; i++)
    {
        if(strcmp(argv[i], "-p") == 0)
        {
            port = atoi(argv[++i]);
        }

        else if(strcmp(argv[i], "-s") == 0)
        {
            thread_pool_size = atoi(argv[++i]);
        }

        else if(strcmp(argv[i], "-q") == 0)
        {
            queue_size = atoi(argv[++i]);
        }

        else
        {
            printf("Wrong Input < %s >\n", argv[i]);
            exit(1);
        }
    }

    printf("%d %d %d\n", port, thread_pool_size, queue_size);

    /* Create socket */
    if((sock = socket(PF_INET, SOCK_STREAM, 0)) < 0)
    {
        perror_exit("socket");
    }

    server.sin_family = AF_INET;       /* Internet domain */
    server.sin_addr.s_addr = htonl(INADDR_ANY);
    server.sin_port = htons(port);      /* The given port */

    /* Bind socket to address */
    if(bind(sock, serverptr, sizeof(server)) < 0)
    {
        perror_exit("bind");
    }

    /* Listen for connections */
    if(listen(sock, 5) < 0)
    {
        perror_exit("listen");
    }

    printf("Listening for connections to port %d\n", port);

    while(1)
    {
        /* accept connection */
        if((newsock = accept(sock, clientptr, &clientlen)) < 0)
        {
            //HERE IS THE PROBLEM
            perror_exit("accept");
        }

        if((rem = gethostbyaddr((char *) &client.sin_addr.s_addr, sizeof(client.sin_addr.s_addr), client.sin_family)) == NULL)
        {
            herror("gethostbyaddr");
            exit(1);
        }

        printf("Accepted connection from %s\n", rem->h_name);

        close(sock);

        if((err = pthread_create(&thr, NULL, (void*)thread_f, (int *)newsock)))
        {
            perror_exit("pthread_create");
            exit(1); 
        }

        if((err = pthread_join(thr, (void **) &status)))
        {
            perror_exit("pthread_join");
            exit(1); 
        }

        close(newsock);
    }

    return 0;
}

客户:

int main(int argc, char *argv[])
{
    int port, sock, i;
    char buf[30];
    struct sockaddr_in server;
    struct sockaddr *serverptr = (struct sockaddr*)&server;
    struct hostent *rem;
    char server_ip[15];

    if(argc != 7)
    {
        printf("Usage: ./remoteClient -i <server_ip> -p <server_port> -d <directory>\n");
        exit(1);
    }

    for(i=1; i<argc; i++)
    {
        if(strcmp(argv[i], "-i") == 0)
        {
            strcpy(server_ip, argv[++i]);
        }

        else if(strcmp(argv[i], "-p") == 0)
        {
            port = atoi(argv[++i]);
        }

        else if(strcmp(argv[i], "-d") == 0)
        {
            strcpy(buf, argv[++i]);
        }

        else
        {
            printf("Wrong Input < %s >\n", argv[i]);
            exit(1);
        }
    }

    printf("%s %d %s\n", server_ip, port, buf);

    /* Create socket */
    if((sock = socket(PF_INET, SOCK_STREAM, 0)) < 0)
    {
        perror_exit("socket");
    }

    /* Find server address */
    if((rem = gethostbyname(server_ip)) == NULL)
    {   
        herror("gethostbyname"); exit(1);
    }

    server.sin_family = AF_INET;
    memcpy(&server.sin_addr, rem->h_addr, rem->h_length);
    server.sin_port = htons(port);

    /* Initiate connection */
    if(connect(sock, serverptr, sizeof(server)) < 0)
    {
        perror_exit("connect");
    }

    if (write(sock, buf, sizeof(buf)) < 0)
    {
        perror_exit("write");
    }

    close(sock);

    printf("ok\n");

    return 0;
}

如果你想运行它们:

./dataServer -p 12500 -s 2 -q 2

./remoteClient -i localhost -p 12500 -d ./dir/file_1

请不要介意我的其余代码。 你能帮我吗？提前致谢!

最佳答案

来自接受 man page (我的重点)

The addrlen argument is a value-result argument: the caller must initialize it to contain the size (in bytes) of the structure pointed to by addr; on return it will contain the actual size of the peer address.

您传入一个未初始化的变量。您需要初始化它以提供缓冲区的大小 clientptr 指向

socklen_t clientlen = sizeof(client);

在此之后，你应该移动线

close(sock);

超过 while 循环的结尾。您的下一个错误是由在您已关闭的句柄上运行的循环的第二次迭代引起的。

关于c - 错误 : Invalid argument while trying to accept a connection from a client，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24515526/