Linux 套接字错误：连接被拒绝 - 我做错了什么？
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Socket error: connection refused - what am I doing wrong?
提问by Kalec
I've just started learning the basics of sockets (Linux). I tried my hand at a small example, but it doesn't work and I have no idea what's wrong.
我刚刚开始学习套接字（Linux）的基础知识。我尝试了一个小例子，但它不起作用，我不知道出了什么问题。
I get a "Connection Refused" error message.
我收到“连接被拒绝”错误消息。
Here's my code:
这是我的代码：
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
int main() {
int c;
c = socket(AF_INET, SOCK_STREAM, 0);
if (c < 0) {
printf("Error in creating socket! %s\n", strerror(errno));
return 1;
}
struct sockaddr_in server;
memset(&server, 0, sizeof(server));
server.sin_port = htons(1234);
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr("127.0.0.1"); //local host
if (connect(c, (struct sockaddr *)&server, sizeof(server)) < 0) {
// Here is my error
printf("Error when connecting! %s\n",strerror(errno));
return 1;
}
while(1) {
char msg[100];
printf("Give message: ");
fgets(msg, sizeof(msg), stdin);
send(c, &msg, sizeof(msg), 0);
char resp[100];
recv(c, &resp, sizeof(resp), 0);
printf("Received: %s\n", resp);
}
close(c);
}
EDIT
编辑
Of course ! the error was actually in the server. I simply found it weired that the client sent the message, so I narrowed my view, didn't even bother looking back at the server.
当然 ！错误实际上是在服务器中。我只是发现客户端发送消息很奇怪，所以我缩小了视野，甚至懒得回头看服务器。
Since the error seems to be also in my server, I might end up asking another question and linking it here
由于错误似乎也在我的服务器中，我可能最终会问另一个问题并将其链接到这里
Server was listening to (12345) ...
服务器正在侦听 (12345) ...
采纳答案by moooeeeep
According to the man page:
根据手册页：
ECONNREFUSEDNo-one listening on the remote address.
ECONNREFUSED无人监听远程地址。
In order to provide a simple remote endpoint that accepts your connection and sends back the received data (echo server), you could try something like this python server(or to use netcat):
为了提供一个简单的远程端点来接受您的连接并发回接收到的数据（回声服务器），您可以尝试像这个python 服务器这样的东西（或使用netcat）：
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("localhost", 1234))
s.listen(1)
conn, addr = s.accept()
print 'Connected by', addr
while 1:
data = conn.recv(1024)
if not data: break
conn.sendall(data)
conn.close()
回答by Kalec
probably no server listening port 1234 in your local host
本地主机中可能没有服务器侦听端口 1234
回答by Satish
Your Answer is: You program is client and it need a server to connect. nccommand create server and your program can connect to it.
你的答案是：你的程序是客户端，它需要一个服务器来连接。nc命令 create server 并且您的程序可以连接到它。
[root@mg0008 work]# nc -l 127.0.0.1 1234 &
[1] 25380
[root@mg0008 work]# ./socket
Give message: Hello
Hello
