作为TCP客户端转发数据

Question

我有一个客户端从服务器A请求数据（DA），然后我需要将DA发送到第二个服务器B。在数据不大于缓冲区的情况下，我得到了它。但是以下内容不适用于将所有数据从A传递到B。我注意到，当我创建socket_fwd并在关闭第一个sockfd之后进行连接时，它可以工作。但是由于我需要转发所有数据，因此我需要在到达所有数据后立即对其进行处理

    int sockfd, sockfd_fwd, n, n_fwd;
    gint BUFFER=900;
    char buf[BUFFER];
    char* addr = "11.0.0.20"; //Server A listening on port 80
    struct sockaddr_in server_addr = {0};
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(80);
    char chunk[BUFFER]; 
    gint nfw;
    gint total_recv = 0;
    gint total_fwd = 0;
    struct sockaddr_in server_addr2 = {0};
   server_addr2.sin_port =  htons(5555);
   server_addr2.sin_family = AF_INET;
   char *addr2 = "127.0.0.1"; //Server B listening on port 555

   //#################Request data from A:80 ###########################
   if(inet_pton(AF_INET, addr, &server_addr.sin_addr) != 1){
       perror("inet_pton");
       return -1;
   }
   sockfd = socket(AF_INET, (SOCK_STREAM), 0); //socket with server A
   if (connect(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) 
   mylog(G_LOG_LEVEL_MESSAGE, __FUNCTION__,"Error on connect"); 
  send(sockfd, buffer, strlen(buffer), 0); //Buffer contains something like get xx Kib to the server
  bzero(buffer, BUFFER);      
  if(inet_pton(AF_INET, addr2, &server_addr2.sin_addr) != 1){
     mylog(G_LOG_LEVEL_MESSAGE, __FUNCTION__,"Error inet pton");
  return -1;
  }

  if(inet_pton(AF_INET, addr2, &server_addr2.sin_addr) != 1){
     perror("inet_pton");
     return -1;
  }
  sockfd_fwd = socket(AF_INET, (SOCK_STREAM), 0); //socket with server B
  if (connect(sockfd_fwd, (struct sockaddr*)&server_addr2, sizeof(server_addr2)) < 0) 
     mylog(G_LOG_LEVEL_MESSAGE, __FUNCTION__,"Error on connect");    

  while ((n = recv(sockfd, chunk, BUFFER, 0)) > 0) {
     total_recv += n;
     mylog(G_LOG_LEVEL_MESSAGE, __FUNCTION__,"Recv chunk %s num-bytes:%i",chunk,total_recv);
     nfw = send(sockfd_fwd, chunk ,n, 0);
     memset(chunk,0,BUFFER);
   }
   close(sockfd);
   close(sockfd_fwd);