用原始套接字写一个echo程序
时间: 2023-03-14 14:09:35 浏览: 56
答:下面是用原始套接字编写的echo程序:#include<stdio.h>
#include<string.h>
#include<sys/socket.h>
#include<arpa/inet.h> int main(int argc , char *argv[])
{
int socket_desc , client_sock , c , read_size;
struct sockaddr_in server , client;
char client_message[2000];
// 创建socket
socket_desc = socket(AF_INET , SOCK_STREAM , 0);
if (socket_desc == -1)
{
printf("Could not create socket");
}
// 准备服务器sockaddr_in结构
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = htons( 8888 );
// 绑定
if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
{
puts("bind failed");
return 1;
}
puts("bind done");
// 监听
listen(socket_desc , 3);
// 接受客户端连接
puts("Waiting for incoming connections...");
c = sizeof(struct sockaddr_in);
// 建立与客户端的连接
client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c);
if (client_sock < 0)
{
perror("accept failed");
return 1;
}
puts("Connection accepted");
// 接收客户端消息
while( (read_size = recv(client_sock , client_message , 2000 , 0)) > 0 )
{
// 发送回复消息给客户端
write(client_sock , client_message , strlen(client_message));
}
if(read_size == 0)
{
puts("Client disconnected");
fflush(stdout);
}
else if(read_size == -1)
{
perror("recv failed");
}
return 0;
}