网络编程day2作业

1.tcp实现通信

服务器：

//tcp服务端

#include 

#define SERPORT 8888
#define IP "192.168.125.6"

int main(int argc, const char *argv[])
{ 
	//1.创建套接字
	int sfd=socket(AF_INET,SOCK_STREAM,0);
	
	//2.绑定
	struct sockaddr_in ser;
	ser.sin_family=AF_INET;
	ser.sin_port=htons(SERPORT);
	ser.sin_addr.s_addr=inet_addr(IP);

	bind(sfd,(struct sockaddr*)&ser,sizeof(ser));
	printf("服务器已上线!\n");

	//3.监听
	listen(sfd,128);
	printf("开始监听客户端连接情况>>>>>\n");
	
	//4.接收客户端地址消息结构体
	struct sockaddr_in cli;
	socklen_t socklen=sizeof(cli);
	int newfd=accept(sfd,(struct sockaddr*)&cli,&socklen);
	
	printf("客户:[%s: %d]连接成功\n",inet_ntoa(cli.sin_addr),ntohs(cli.sin_port));
	
	//5.收发数据
	char buf[128]="";
	while(1)
	{
		bzero(buf,sizeof(buf));
		recv(newfd,buf,sizeof(buf),0);
		printf("[%s: %d]:%s\n",inet_ntoa(cli.sin_addr),ntohs(cli.sin_port),buf);

		if(strcmp(buf,"quit")==0)
		{
			printf("客户[%s: %d]已下线!\n",inet_ntoa(cli.sin_addr),ntohs(cli.sin_port));
			break;
		}
	}
	
	//6.关闭套接字
	close(newfd);
	close(sfd);

	return 0;
}

客户端：

//tcp客户端

#include 

#define PORT 8888
#define IP "192.168.125.6"

int main(int argc, const char *argv[])
{ 
	//1.创建套接字
	int cfd=socket(AF_INET,SOCK_STREAM,0);
	
	//2.连接服务端
	struct sockaddr_in ser;
	ser.sin_family=AF_INET;
	ser.sin_port=htons(PORT);
	ser.sin_addr.s_addr=inet_addr(IP);

	connect(cfd,(struct sockaddr*)&ser,sizeof(ser));
	printf("已连接服务器!\n");
	
	//3.收发数据
	char buf[128]="";
	while(1)
	{
		bzero(buf,sizeof(buf));
		printf("请输入内容:");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]='\0';
		send(cfd,buf,sizeof(buf),0);

		if(strcmp(buf,"quit")==0)
			break;
	}
	
	//4.关闭套接字
	close(cfd);

	return 0;
}

效果：

2.udp实现通信

服务器：

//udp服务器

#include 

#define PORT 9999
#define IP "192.168.125.6"

int main(int argc, const char *argv[])
{ 
	//1.创建套接字
	int sfd=socket(AF_INET,SOCK_DGRAM,0);
	
	//2.绑定服务器
	struct sockaddr_in ser;
	ser.sin_family=AF_INET;
	ser.sin_port=htons(PORT);
	ser.sin_addr.s_addr=inet_addr(IP);

	bind(sfd,(struct sockaddr*)&ser,sizeof(ser));
	printf("服务器已上线! 等待连接中>>>>>\n");
	
	//3.收发数据
	char buf[128]="";
	struct sockaddr_in cli;
	socklen_t socklen=sizeof(cli);
	while(1)
	{
		bzero(buf,sizeof(buf));
		recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cli,&socklen);
		printf("客户[%s: %d]:%s\n",inet_ntoa(cli.sin_addr),ntohs(cli.sin_port),buf);
		
		if(strcmp(buf,"quit")==0)
		{
			printf("客户[%s: %d]已下线!\n",inet_ntoa(cli.sin_addr),ntohs(cli.sin_port));
			break;
		}
	}
	
	//4.关闭套接字
	close(sfd);


	return 0;
}

客户端：

//udp客户端

#include 

#define PORT 9999
#define IP "192.168.125.6"

int main(int argc, const char *argv[])
{ 
	//1.创建套接字
	int cfd=socket(AF_INET,SOCK_DGRAM,0);
	
	//2.收发数据
	char buf[128]="";
	struct sockaddr_in ser;
	ser.sin_family=AF_INET;
	ser.sin_port=htons(PORT);
	ser.sin_addr.s_addr=inet_addr(IP);

	while(1)
	{
		bzero(buf,sizeof(buf));
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]='\0';
		sendto(cfd,buf,sizeof(buf),0,(struct sockaddr*)&ser,sizeof(ser));

		if(strcmp(buf,"quit")==0)
			break;
	}
	
	//3.关闭套接字
	close(cfd);


	return 0;
}

效果：