Question

服务器端程序

if(bind(sockfd, (struct sockaddr *) &serv_addr,sizeof(serv_addr)) <0)
{
    error("Error in binding");
}

/* added newly */

while(1)
{
   listen(sockfd,5);
   newsockfd = accept(sockfd, (struct serv_addr *) &client_addr,&client_len); /*this will actually receive the client address and the length of it*/
   printf("The client ip address is:");
   printf("%s\n", inet_ntoa(client_addr.sin_addr));
   PID=fork();
   if(!PID)
   { 
     printf("Forking the new child");        
      for(;;)
      {
      /* bzero(buffer,256);  */
      n = read(newsockfd,buffer,255);
      if (n < 0)
      error("ERROR reading from socket");
      printf("Here is the message: %s\n",buffer);
      n = write(newsockfd,"I got your message\n",18);
      if (n < 0) error("ERROR writing to socket");
       bzero(buffer,256);
      }
   }
}

客户计划：

sockfd = socket(AF_INET, SOCK_STREAM, 0); 
if(sockfd<0)
{
    error("Error in opening of socket");
}
/*  gets(ip_adr);*/
serv_addr.sin_addr.s_addr =inet_addr(ip_adr);           /* the obtained ip address which is a dotted string is converted to unsigned long.*/
serv_addr.sin_family = AF_INET;          /* this information we specify that it belongs to tcp or udp*/
serv_addr.sin_port = htons(port_no);      /*htons is used because we may need to change it to network byte order which is always big endian*/
/* We need not have a binding in this because we need not have to include a specified port*/
    if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0)        /* same as accept here in the client we establish a connection */
    error("ERROR connecting");
    else
            printf("Connected");
    for(;;)
    {
     /* printf("\nPlease enter the message which u need to send:\n"); */
     /* bzero(buffer,256);                                          */
    fgets(buffer,255,stdin);                                            
    n = write(sockfd,buffer,strlen(buffer));                     
    if (n < 0)
    error("ERROR writing to socket");
    bzero(buffer,strlen(buffer));
    n = read(sockfd,buffer,255);
    if (n < 0)
    error("ERROR reading from socket");
    printf("%s",buffer);

   }
}

当我尝试将某些客户端连接到服务器时，服务器从第一个客户端接收第一条消息作为空白消息，并将第一个客户端IP打印为127.0.0.1，对于其他客户端，服务器正确打印其IP地址并接收消息来自客户？是这样吗？ y是从第一个客户端接收第一条消息作为空白消息的服务器？ y是服务器打印第一个客户端的IP地址为127.0.0.0？有些人可以帮助我......

提前致谢。

的问候， Sudharsanam。

服务器 - 客户端编程问题

0 个答案: