网络编程day2

作业

1> 将TCP和UDP通信模型自己实现一遍

//客户端
#include
#define USER_PORT   9002
#define USER_IP   "192.168.125.39"

#define SERVER_PORT   8001
#define SERVER_IP   "192.168.125.39"
int main(int argc, const char *argv[])
{
	//socket()
	int sock_fd=-1;
	if((sock_fd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		perror("socket error");
		return -1;
	}
	//端口号快速重用
	int reuse = 1;
	if(setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))==-1)
	{
		perror("setsockopt error");
		return -1;
	}	//(bind())
	struct sockaddr_in user_info;
	user_info.sin_family=AF_INET;
	user_info.sin_port= htons(USER_PORT);
	user_info.sin_addr.s_addr=inet_addr(USER_IP);
	if(bind(sock_fd,(struct sockaddr*)&user_info,sizeof(user_info))==-1)
	{
		perror("bind error");
		return -1;
	}
	//connect()
	struct sockaddr_in server_info;
	server_info.sin_family=AF_INET;
	server_info.sin_port= htons(SERVER_PORT);
	server_info.sin_addr.s_addr=inet_addr(SERVER_IP);
	if(connect(sock_fd,(struct sockaddr*)&server_info,sizeof(server_info))==-1)
	{
		perror("connect error");
		return -1;
	}
	printf("[%s:%d]->user:sock_fd%d 连接服务器成功",USER_IP,USER_PORT,sock_fd);
	//recv/send/read/write()
	char buf[128]="";
	while(1)
	{
		bzero(buf,sizeof(buf));
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
		if(strcmp(buf,"quit")==0)
		{
			strcpy(buf,"quit");
			send(sock_fd,buf,sizeof(buf),0);
			break;
		}
		send(sock_fd,buf,sizeof(buf),0);
	}
	//close()
	close(sock_fd);
	return 0;
}

//服务器
#include
#define POST 8001
#define IP "192.168.125.39"
int main(int argc, const char *argv[])
{
	//1.创建套接字
	int sfd=-1;
	//功能创建一个支持TCP通信的套接字
	//AF_INET:表示跨主机的IPV4的通信
	//SOCK_STREAM：表示支持tcp通信
	if((sfd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		perror("socket error");
		return -1;
	}
	printf("sfd=%d\n",sfd);
	//将端口号快速重用
	int reuse = 1;
	if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))==-1)
	{   
		perror("setsockopt error");
		return -1;                                                                     
	} 
	//2.绑定地址信息结构体（服务器必须要）
	//填充地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family= AF_INET;
	sin.sin_port= htons(POST);
	sin.sin_addr.s_addr=inet_addr(IP);
	//绑定工作
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))==-1)
	{
		perror("bind error");
		return -1;
	}
	printf("bind success _%d_%s_%s\n",__LINE__, __FILE__ ,__func__);
	//3.将套接字设置成被动监听状态
	if(listen(sfd,128)==-1)
	{
		perror("listen error");
		return -1;
	}
	printf("listen success _%d_%s_%s\n",__LINE__, __FILE__ ,__func__);
	//4.接受链接请求
	//不接受客户端的连接信息
	/*	if(accept(sfd,NULL,NULL)==-1)
		{
		perror("accept error");
		return -1;
		}
		printf("accept success _%d_%s_%s\n",__LINE__, __FILE__ ,__func__);
		*/
	//接受客户端的地址信息的结构体变量
	struct sockaddr_in cin;
	int newfd=-1;
	socklen_t socklen=sizeof(cin);//接受长度
	if((newfd=(accept(sfd,(struct sockaddr*)&cin,&socklen)))==-1)
	{
		perror("accept error");
		return -1;
	}
	printf("[%s:%d] 连接成功,newfd=%d\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
	//收发数据
	char rbuf[128]="";
	while(1)
	{
		bzero(rbuf,sizeof(rbuf));	
		//	int res=read(newfd,rbuf,sizeof(rbuf));
		int res=recv(newfd,rbuf,sizeof(rbuf),0);
		if(res==0)
		{
			printf("客户端下线\n");
			break;
		}
		printf("[%s:%d] :%s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),rbuf);
		//数据发送到客户端
		strcat(rbuf,"*_*");
		//	write(newfd,rbuf,sizeof(rbuf));
		send(newfd,rbuf,sizeof(rbuf),0);
		printf("发送成功\n");
	}
	//关闭文件
		close(newfd);
		close(sfd);
	return 0;
}

 

 

//服务器
#include
#define SERVE_IP "192.168.125.39"
#define SERVE_PORT 8888
int main(int argc, const char *argv[])
{
	//1.socket()
	int serve_fd=-1;
	if((serve_fd=socket(AF_INET,SOCK_DGRAM,0))==-1)
	{
		perror("socker error");
		return -1;
	}
	//端口号快速重用
	int reuse = 1;
	if(setsockopt(serve_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))==-1)
	{
		perror("setsockopt error");
		return -1;
	}	//2.bind()
	struct sockaddr_in serve_info;
	serve_info.sin_family=AF_INET;
	serve_info.sin_port=htons(SERVE_PORT);
	serve_info.sin_addr.s_addr=inet_addr(SERVE_IP);
	if(bind(serve_fd,(struct sockaddr*)&serve_info,sizeof(serve_info))==-1)
	{
		perror("bind error");
		return -1;
	}
	printf("[%s:%d]->serve_fd=%d 绑定成功\n",SERVE_IP,SERVE_PORT,serve_fd);
	//3.recvfrom/sendto()
	char buf[128]="";
	struct sockaddr_in user_info;
	socklen_t user_infolen=sizeof(user_info);
	while(1)
	{
		bzero(buf,sizeof(buf));
		recvfrom(serve_fd,buf,sizeof(buf),0,(struct sockaddr*)&user_info,&user_infolen);
		printf("[%s:%d]->%s\n",SERVE_IP,SERVE_PORT,buf);
		strcat(buf,">>>>>>>");
		sendto(serve_fd,buf,sizeof(buf),0,(struct sockaddr*)&user_info,user_infolen);
	}
	//4.close()
	close(serve_fd);
	return 0;
}

//客户端
#include
#define USER_IP "192.168.125.39"
#define USER_PORT 9999
#define SERVE_IP "192.168.125.39"
#define SERVE_PORT 8888
int main(int argc, const char *argv[])
{
	//1.socket()
	int user_fd=-1;
	if((user_fd=socket(AF_INET,SOCK_DGRAM,0))==-1)
	{
		perror("socker error");
		return -1;
	}
	//端口号快速重用
	int reuse = 1;
	if(setsockopt(user_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))==-1)
	{
		perror("setsockopt error");
		return -1;
	}	//2.bind()
	struct sockaddr_in user_info;
	user_info.sin_family=AF_INET;
	user_info.sin_port=htons(USER_PORT);
	user_info.sin_addr.s_addr=inet_addr(USER_IP);
	if(bind(user_fd,(struct sockaddr*)&user_info,sizeof(user_info))==-1)
	{
		perror("bind error");
		return -1;
	}
	printf("[%s:%d]->user_fd=%d 绑定成功\n",USER_IP,USER_PORT,user_fd);
	//3.recvfrom/sendto()
	char buf[128]="";
	struct sockaddr_in serve_info;
	serve_info.sin_family=AF_INET;
	serve_info.sin_port=htons(SERVE_PORT);
	serve_info.sin_addr.s_addr=inet_addr(SERVE_IP);
	socklen_t serve_infolen=sizeof(serve_info);
	while(1)
	{
		bzero(buf,sizeof(buf));
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
		sendto(user_fd,buf,sizeof(buf),0,(struct sockaddr*)&serve_info,serve_infolen);
		recvfrom(user_fd,buf,sizeof(buf),0,NULL,NULL);
		printf("[%s:%d]->%s\n",USER_IP,USER_PORT,buf);
	}
	//4.close()
	close(user_fd);
	return 0;
}