我正在尝试使用 C 中的套接字编写一个简单的客户端和服务器。客户端和服务器都在运行 Ubuntu。服务器正在广播一个 ad-hoc 网络,但是尽管能够从终端 ping 它,但我似乎无法让客户端连接到服务器。
我用于服务器和客户端的代码改编自在线资源,如下所示:
#include<stdio.h>
#include<string.h> //strlen
#include<sys/socket.h>
#include<arpa/inet.h> //inet_addr
#include<unistd.h> //write
int main(int argc , char *argv[])
{
int socket_desc , new_socket , c;
struct sockaddr_in server , client;
char *message;
//Create socket
socket_desc = socket(AF_INET , SOCK_STREAM , 0);
if (socket_desc == -1)
{
printf("Could not create socket");
}
//Prepare the sockaddr_in structure
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = htons( 8888 );
//Bind
if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
{
puts("bind failed");
return 1;
}
puts("bind done");
//Listen
listen(socket_desc , 3);
//Accept and incoming connection
puts("Waiting for incoming connections...");
c = sizeof(struct sockaddr_in);
new_socket = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c);
if (new_socket<0)
{
perror("accept failed");
return 1;
}
puts("Connection accepted");
//Reply to the client
message = "Hello Client , I have received your connection. But I have to go now, bye\n";
write(new_socket , message , strlen(message));
return 0;
}
客户
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
int main(int argc , char *argv[])
{
int socket_desc;
struct sockaddr_in server;
char *message;
//Create socket
socket_desc = socket(AF_INET , SOCK_STREAM , 0);
if (socket_desc == -1)
{
printf("Could not create socket");
}
server.sin_addr.s_addr = inet_addr("192.168.0.1");
server.sin_family = AF_INET;
server.sin_port = htons( 80 );
//Connect to remote server
if (connect(socket_desc , (struct sockaddr *)&server , sizeof(server)) < 0)
{
puts("connect error");
return 1;
}
puts("Connected\n");
//Send some data
message = "GET / HTTP/1.1\r\n\r\n";
if( send(socket_desc , message , strlen(message) , 0) < 0)
{
puts("Send failed");
return 1;
}
puts("Data Send\n");
return 0;
}
IP 地址是通过在服务器终端上运行 ifconfig 并查看其 inet addr 值获得的。
此外,我还通过在终端中运行 sudo ufw disable 来禁用客户端和服务器上的防火墙。Errno 也输出连接被拒绝。
谁能帮我解决这个问题?