网络编程day2 UPD模型练习

UDP客户端

#define SER_IP "192.168.110.119"
#define SER_PORT 8889
#define CLI_IP "192.168.110.119"
#define CLI_PORT 6667
int main(int argc, const char *argv[])
{
	//创建描述符
	int cfd = socket(AF_INET,SOCK_DGRAM,0);
	if (-1 == cfd )
	{
		perror("socket error");
		return -1;
	}
	printf("cfd = %d\n",cfd);
	//绑定端口号
	  //填充地址信息结构体
	struct sockaddr_in cin;//定义客户端的地址信息结构体
	cin.sin_family = AF_INET;
	cin.sin_port = htons(CLI_PORT);
	cin.sin_addr.s_addr = inet_addr(CLI_IP);

	socklen_t addrlen = sizeof(cin);
	  //绑定
	if(bind(cfd,(struct sockaddr*)&cin,sizeof(cin)) == -1 )
	{
		perror("bind error");
		return -1;
	}
	printf("bind success\n");
	
	//发送接收数据
	char wbuf[128] = ""; //发送容器
	char rbuf[128] = ""; //接收容器
	  
	  //填充服务器信息结构体
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(SER_PORT);
	sin.sin_addr.s_addr = inet_addr(SER_IP);

	while(1) //循环发送数据并接收服务器返回的消息
	{
		bzero(wbuf,sizeof(wbuf));
		bzero(rbuf,sizeof(rbuf));

		//从终端上获取信息
		fgets(wbuf,sizeof(wbuf),stdin);
		wbuf[strlen(wbuf) - 1] = 0; //将回车换成文件结束符

		//将消息发送给服务器
		if(sendto(cfd,wbuf,strlen(wbuf),0,(struct sockaddr*)&sin,sizeof(sin)) == -1)
		{
			perror("sendto error");
			return -1;
		}
		printf("发送成功\n");

		//接收服务器传来的消息
		if(recvfrom(cfd,rbuf,sizeof(rbuf),0,(struct sockaddr*)&cin,&addrlen) == -1)
		{
			perror("recvfrom error");
			return -1;
		}
		printf("接收到的消息为:[%s:%d]:%s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),rbuf);
	}
	//关闭描述符
	close (cfd);
	return 0;
}

UPD服务器

#define SER_IP "192.168.110.119"
#define SER_PORT 8889
int main(int argc, const char *argv[])
{
	//创建描述符
	int sfd = socket(AF_INET,SOCK_DGRAM,0);
	if(-1 == sfd)
	{
		perror("socket");
		return -1;
	}
	printf("sfd = %d\n",sfd);
	//绑定ip
		//填充地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(SER_PORT);
	sin.sin_addr.s_addr = inet_addr(SER_IP);

	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin)) == -1)
	{
		perror("bind error");
		return -1;
	}
	printf("bind success\n");

	//数据收发
	char rbuf[128] = "";
	struct sockaddr_in cin;
	socklen_t addrlen = sizeof(cin);
	while(1)
	{
		bzero(rbuf,sizeof(rbuf));
		//read(sfd,rbuf,sizeof(rbuf));
		recvfrom(sfd,rbuf,sizeof(rbuf),0,(struct sockaddr*)&cin,&addrlen);
		printf("收到的消息为：%s\n",rbuf);
		
		strcat(rbuf,"*_*");
		if(sendto(sfd,rbuf,strlen(rbuf),0,(struct sockaddr*)&cin,sizeof(cin)) == -1)
		{
			perror("write error");
			return -1;
		}
		printf("发送成功\n");
	}
	//关闭套接字
	close (sfd);
	return 0;
}

效果图