[英]C server - Python client. Connection refused
I'm new to Sockets, please excuse my complete lack of understanding.我是 Sockets 的新手,请原谅我完全不了解。
useless_server.c: useless_server.c:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
int main(void)
{
int sd;
int newsd;
struct sockaddr_in client_addr;
socklen_t cli_size;
struct sockaddr_in server_addr;
sd = socket(AF_INET, SOCK_STREAM, 0);
if (sd < 0)
{
printf("unable to create socket\n");
exit(1);
}
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = INADDR_ANY;
server_addr.sin_port = 50000;
if (bind(sd, (struct sockaddr *) &server_addr, sizeof(server_addr)) < 0)
{
printf("unable to bind socket\n");
exit(1);
}
listen(sd, 2);
while (1)
{
cli_size = sizeof(client_addr);
newsd = accept(sd, (struct sockaddr *) &client_addr, &cli_size);
printf("Got connection from %s\n", inet_ntoa(client_addr.sin_addr));
if (newsd < 0)
{
printf("Unable to accept connection\n");
exit(1);
}
sleep(5);
close(newsd);
}
return 0;
}
useless_client.py无用客户端.py
#!/usr/bin/env python3
import socket
sock = socket.socket(family=socket.AF_INET, type=socket.SOCK_STREAM)
sock.connect((socket.gethostname(), 50000))
useless_server.c was compiled with gcc. useless_server.c 是用 gcc 编译的。 Then I run server in one terminal.
然后我在一个终端上运行服务器。 Client is called from another.
客户端是从另一个调用的。
When running useless_client.py I get:运行 useless_client.py 时,我得到:
Traceback (most recent call last):
File "./useless_client.py", line 7, in <module>
sock.connect((socket.gethostname(), 50000))
ConnectionRefusedError: [Errno 111] Connection refused
When I am trying to connect to the C server from C client - everything is fine.当我尝试从 C 客户端连接到 C 服务器时 - 一切都很好。 I use in both cases AF_INET, SOCK_STREAM.
我在这两种情况下都使用 AF_INET、SOCK_STREAM。
When I am trying to connect from Python client to analogical Python server - everything is fine.当我尝试从 Python 客户端连接到模拟 Python 服务器时 - 一切都很好。
What am I doing wrong?我究竟做错了什么?
Updated.更新。
replacing更换
server_addr.sin_port = 50000;
with和
server_addr.sin_port = htons(50000);
fixed the problem.解决了这个问题。 Thanks!
谢谢!
What am I doing wrong?
我究竟做错了什么?
In the C program, you forgot to convert the port number to network byte order (which is done implicitly in Python):在 C 程序中,您忘记将端口号转换为网络字节顺序(在 Python 中隐式完成):
server_addr.sin_port = htons(50000);
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