在 openSUSE 中工作的套接字在 Debian 中不工作? [英] Sockets working in openSUSE do not work in Debian?

问题描述

我有一个 C/C++ TCP 客户端在 OpenSUSE 中工作，但在 Debian 中没有.我正在使用 nc -l 4242 作为服务器.然后我在我的 Debian 系统 (Sid) 上连接 ./my_client 127.0.0.1 4242，使用连接功能时会失败.

I have a C/C++ TCP client working in OpenSUSE but not in Debian. I'm using nc -l 4242 for the server. Then I connect with ./my_client 127.0.0.1 4242 on my Debian system (Sid) and it will fail when using the connect function.

您能否确认您是否也有同样的错误，使用 Debian 或其他操作系统?问题出在哪里?

Can you confirm if you have the same error too, using Debian or maybe another OS? Where does the problem come from?

代码如下:

#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>

void do_server(int s)
{
  write(s, "client connected
", strlen("client connected
"));
  close(s);
}

int main(int ac, char **av)
{
  struct protoent *pe;
  struct sockaddr_in sin;
  int s;

  if (ac != 3)
    {
      std::cerr << "Usage: ./client ip port" << std::endl;
      return EXIT_FAILURE;
    }
  pe = getprotobyname("TCP");
  if ((s = socket(AF_INET, SOCK_STREAM, pe->p_proto)) == -1)
    {
      std::cerr << "Error: socket" << std::endl;
      return EXIT_FAILURE;
    }
  sin.sin_family = AF_INET;
  sin.sin_port = htons(atoi(av[2]));
  sin.sin_addr.s_addr = inet_addr(av[1]);
  if (connect(s, (const struct sockaddr *)&sin, sizeof(sin)) == -1)
    {
      std::cerr << "Error: connect" << std::endl;
      close(s);
      return EXIT_FAILURE;
    }
  std::cout << "client started" << std::endl;
  do_server(s);
  return EXIT_SUCCESS;
}

推荐答案

这似乎和你选择的 netcat 风格有关.

This seems to have to do with the netcat flavor you have selected.

使用传统"netcat(/etc/alternatives/nc 链接到 /bin/nc.traditional)您必须使用此语法来指定侦听端口:

With the 'traditional' netcat (/etc/alternatives/nc links to /bin/nc.traditional) you have to use this syntax to specify the listening port:

nc -l -p 4242

'openbsd' netcat 也支持这种语法(以及你使用的那个)，即使它的手册页说你不能使用 -l 和 -p 一起.

The 'openbsd' netcat also supports this syntax (as well as the one you used) even though it's man page says you can't use -l and -p together.

这篇关于在 openSUSE 中工作的套接字在 Debian 中不工作?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！