笔记脑图

作业：

1、将虚拟机调整到桥接模式联网。

2、TCP客户端服务器实现一遍。

服务器

#include <stdio.h>
#include <string.h>
#include <myhead.h>
#define IP "192.168.60.44"
#define PORT 6666
#define BACKLOG 20
int main(int argc, const char *argv[])
{
	//创建
	int oldfd=socket(AF_INET,SOCK_STREAM,0);
	if(oldfd==-1)
	{
		perror("socket");
		return -1;
	}
	//绑定
	struct sockaddr_in server={
		.sin_family=AF_INET,
		.sin_port=htons(PORT),
		.sin_addr.s_addr=inet_addr(IP),
	};
	if(bind(oldfd,(struct sockaddr *)&server,sizeof(server))==-1)
	{
		perror("bind");
		return -1;
	}
	//监听
	if(listen(oldfd,BACKLOG)==-1)
	{
		perror("listen");
		return -1;
	}
	//接收通信
	struct sockaddr_in client;
	socklen_t client_len=sizeof(client);
	int newfd;
	newfd=accept(oldfd,(struct sockaddr *)&client,&client_len);
	if(newfd==-1)
	{
		perror("accept");
		return -1;
	}
	printf("%s发来连接请求\n",inet_ntoa(client.sin_addr));
	//循环收发
	char buff[1024];
	while(1)
	{
		memset(buff,0,sizeof(buff));
		//int len=read(newfd,buff,sizeof(buff));
		int len=recv(newfd,buff,sizeof(buff),0);
		if(len==0)
		{
			printf("客户端下线\n");
			break;
		}
		printf("%s\n",buff);
		strcat(buff,"5201314");
		//write(newfd,buff,sizeof(buff));
		send(newfd,buff,sizeof(buff),0);
	}
	//关闭
	close(oldfd);
	close(newfd);	
	return 0;
}

客户端

#include <stdio.h>
#include <string.h>
#include <myhead.h>
#define IP "192.168.60.44"
#define PORT 6666
int main(int argc, const char *argv[])
{
	//创建
	int oldfd=socket(AF_INET,SOCK_STREAM,0);
	if(oldfd==-1)
	{
		perror("socket");
		return -1;
	}
	//连接服务器
	struct sockaddr_in server={
		.sin_family=AF_INET,
		.sin_port=htons(PORT),
		.sin_addr.s_addr=inet_addr(IP),
	};
	if(connect(oldfd,(struct sockaddr *)&server,sizeof(server))==-1)
	{
		perror("connect");
		return -1;
	}
	//循环收发
	char buff[1024];
	while(1)
	{
		fgets(buff,sizeof(buff),stdin);
		buff[strlen(buff)-1]='\0';
		send(oldfd,buff,sizeof(buff),0);
		int len=recv(oldfd,buff,sizeof(buff),0);
		if(len==0)
		{
			printf("服务器意外退出\n");
			break;
		}
		printf("接收服务器的消息：%s\n",buff);
	}
	//关闭
	close(oldfd);
	return 0;
}