如何在raspberry pi上打开TCP端口端口5001？ [英] How do I open a TCP port port 5001 on raspberry pi?

问题描述

目前我正在使用带有jessie OS的raspberry pi 2.

i希望树莓（服务器）通过tcp ip与我的Windows计算机（客户端）通信。

i有在我的电脑上添加了一个端口。

我对如何打开树莓上的端口有疑问



电脑和覆盆子没有直接连接。他们连接在同一个网络中



我尝试过：

  / *  使用TCP 
的互联网域中的简单服务器端口number作为参数传递* /  
  #include   <     stdio.h    >  
   #include   <     stdlib.h    >  
   #include   <     string.h    >  
   #include   <     unistd.h    < span class =code-keyword>>  
   #include   < span class =code-keyword><     sys / types.h    >  
   #include   <     sys / socket.h    >  
   #include   <     netinet / in.h    >  
  
  void 错误（ const   char  * msg）
 {
 perror（msg）; 
退出（ 1 ）; 
} 
 
  int  main（ int  argc， char  * argv []）
 {
  int  sockfd，newsockfd，portno =  5001 ; 
 socklen_t clilen; 
  char  buffer [ 256 ]; 
  struct  sockaddr_in serv_addr，cli_addr; 
  int  n; 
  if （argc<  2 ）{
 fprintf（stderr， 错误，没有提供端口\ n）; 
退出（ 1 ）; 
} 
 sockfd = socket（AF_INET，SOCK_STREAM， 0 ）; 
  if （sockfd<  0 ）
 error（  ERROR打开套接字）; 
 bzero（（ char  *）& serv_addr， sizeof （serv_addr））; 
 portno = atoi（argv [ 1 ]）; 
 serv_addr.sin_family = AF_INET; 
 serv_addr.sin_addr.s_addr = INADDR_ANY; 
 serv_addr.sin_port = htons（portno）; 
  if （bind（sockfd，（ struct  sockaddr *）& serv_addr，
  sizeof （serv_addr））<  0 ）
 error（ 绑定错误）; 
 listen（sockfd， 5 ）; 
 clilen =  sizeof （cli_addr）; 
 newsockfd = accept（sockfd，
（ struct  sockaddr *）& cli_addr，
& clilen）; 
  if （newsockfd<  0 ）
错误（ 接受）时的错误; 
 bzero（缓冲区， 256 ）; 
  / *   
 n = read（newsockfd，buffer，255）; 
 if（n< 0）error（从套接字读取错误）; 
 printf（这是消息：％s \ n，缓冲区）; 
 n =写（newsockfd，我收到你的消息，18）; 
 n = write（newsockfd，Server-Message，14）; 
 * /  
n = write（newsockfd，  Server-Message， 512 ）; 
  if （n<  0 ）错误（  ERROR写入套接字）; 
 close（newsockfd）; 
 close（sockfd）; 
  return   0 ; 
} 

程序执行时没有错误。但我得到的输出是



错误，没有端口提供

解决方案

你的程序需要一个端口number在命令行上传递。所以在启动时通过它：

 myserver 5001 

或者你可以通过更改CPallini建议的代码来硬编码端口号。但是你必须评论/删除获取端口号的行：

 //当使用硬编码的端口号
 // if（argc< 2）{
 // fprintf（stderr，ERROR，no port provided\\\
）; 
 //退出（1）; 
 //} 
 sockfd = socket（AF_INET，SOCK_STREAM，0）; 
 if（sockfd< 0）
 error（ERROR open socket）; 
 bzero（（char *）& serv_addr，sizeof（serv_addr））; 
 //使用硬编码端口号
 // portno = atoi（argv [1]）; 

引用：

if（argc< 2）{

fprintf（stderr，ERROR，no port provided\\\
）;

退出（1）;

}

由于你硬连线了端口号，你必须删除上面的行。

currently i am using raspberry pi 2 with jessie OS.
i want the raspberry(server) to communicate with my windows computer(client) via tcp ip.
i have added a port on my pc side.
I have a doubt regarding how to open up a port on the raspberry

the pc and raspberry are NOT connected directly. they are connected in the same network

What I have tried:

/* A simple server in the internet domain using TCP
   The port number is passed as an argument */
#include < stdio.h >
#include < stdlib.h >
#include < string.h >
#include < unistd.h >
#include  < sys/types.h > 
#include < sys/socket.h >
#include < netinet/in.h >

void error(const char *msg)
{
    perror(msg);
    exit(1);
}

int main(int argc, char *argv[])
{
     int sockfd, newsockfd, portno=5001;
     socklen_t clilen;
     char buffer[256];
     struct sockaddr_in serv_addr, cli_addr;
     int n;
     if (argc < 2) {
         fprintf(stderr,"ERROR, no port provided\n");
         exit(1);
     }
     sockfd = socket(AF_INET, SOCK_STREAM, 0);
     if (sockfd < 0) 
        error("ERROR opening socket");
     bzero((char *) &serv_addr, sizeof(serv_addr));
     portno = atoi(argv[1]);
     serv_addr.sin_family = AF_INET;
     serv_addr.sin_addr.s_addr = INADDR_ANY;
     serv_addr.sin_port = htons(portno);
     if (bind(sockfd, (struct sockaddr *) &serv_addr,
              sizeof(serv_addr)) < 0) 
              error("ERROR on binding");
     listen(sockfd,5);
     clilen = sizeof(cli_addr);
     newsockfd = accept(sockfd, 
                 (struct sockaddr *) &cli_addr, 
                 &clilen);
     if (newsockfd < 0) 
          error("ERROR on accept");
     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",18);
        n = write(newsockfd,"Server-Message",14);
     */
     n = write(newsockfd,"Server-Message",512);
     if (n < 0) error("ERROR writing to socket");
     close(newsockfd);
     close(sockfd);
     return 0; 
}

the program executes without error. but the output i get is

ERROR, no port provided

解决方案

Your program requires that a port number is passed on the command line. So pass that when starting it:

myserver 5001

Alternatively you can hard code the port number by changing the code as suggested by CPallini. But then you have to comment / remove the line getting the port number too:

// Ignore this when using hardcoded port number
//if (argc < 2) {
//    fprintf(stderr,"ERROR, no port provided\n");
//    exit(1);
//}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) 
    error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
// Using hard coded port number
//portno = atoi(argv[1]);

Quote:

if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}

Since you hard-wired the port number, you have to remove the above lines.

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