錯誤：嘗試接受來自客戶端的連接時參數無效

Question

我正嘗試使用TCP將客戶端連接到服務器。我想我的客戶端正確地執行了他的工作，但服務器無法接受連接。 這裏是我的代碼：

SERVER：

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; 
} 

客戶：

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; 
} 

如果你想運行它們：

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

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

不要介意我的其他代碼。 你能幫忙嗎？提前致謝！

Answer 1

從acceptman page（我的重點）

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.

你傳遞一個未初始化的變量。您需要初始化這個先給緩衝區clientptr點的大小

socklen_t clientlen = sizeof(client); 

在這之後，你應該招行

close(sock); 

過去你while循環結束。您的下一個錯誤是由在您關閉的手柄上運行的第二次迭代循環引起的。