网络编程（day2）

 思维导图：

TCP服务器:

#include 

#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__:",__LINE__);\
	perror(msg);\
}while(0)

#define PORT 8888
#define IP "192.168.114.67"

int main(int argc, const char *argv[])
{
	//创建流式套接字 socket
	int sfd=socket(AF_INET,SOCK_STREAM,0);
	if(sfd == -1){
		ERR_MSG("socket");
		return -1;
	}
	printf("socket success\n");

	//通用地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family 	= 	AF_INET;
	sin.sin_port 	= 	htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	
	//绑定服务器的IP和端口 bind
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin)) == -1){
		ERR_MSG("bind");
		return -1;
	}
	printf("bind success\n");

	//将套接字设置为被监听状态 listen
	if(listen(sfd,128) == -1){
		ERR_MSG("listen");
		return -1;
	}
	printf("listen success\n");

	struct sockaddr_in cin;
	socklen_t addrlen=sizeof(cin);
	//获取连接成功后的套接字
	int newfd;
	if((newfd=accept(sfd,(struct sockaddr*)&cin,&addrlen)) == -1){
		ERR_MSG("accept");
		return -1;
	}
	printf("accept success\n");

	char buf[128]="";
	ssize_t res;
	while(1){
		//清空字符串
		bzero(buf,sizeof(buf));
		
		//接收数据
		res = recv(newfd,buf,sizeof(buf),0);
		if(-1 == res){
			ERR_MSG("recv");
			return -1;
		}else if(0 == res){
			printf("客户端关闭了\n");
			break;
		}
		printf("收到：%s\n",buf);

		//发送数据
		strcat(buf,"^-^");
		if(send(newfd,buf,strlen(buf),0) == -1){
			ERR_MSG("send");
			return -1;
		}
		printf("send success\n");
	}

	//关闭文件描述符
	close(sfd);
	close(newfd);
	return 0;
}

TCP客户端：

#include 

#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__:",__LINE__);\
	perror(msg);\
}while(0)

#define PORT 8888
#define IP "192.168.114.67"

int main(int argc, const char *argv[])
{
	//创建报式套接字 socket
	int cfd=socket(AF_INET,SOCK_STREAM,0);
	if(cfd == -1){
		ERR_MSG("socket");
		return -1;
	}
	printf("socket success\n");

	struct sockaddr_in sin;
	sin.sin_family 	= 	AF_INET;
	sin.sin_port 	= 	htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);

	//连接服务器 connect
	if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin)) == -1){
		ERR_MSG("connect");
		return -1;
	}
	printf("connect success\n");

	char buf[128]="";
	ssize_t res;
	while(1){
		printf("请输入：");
		bzero(buf,sizeof(buf));
		//发送数据
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]='\0';
		if(send(cfd,buf,strlen(buf),0) == -1){
			ERR_MSG("send");
			return -1;
		}
		printf("send success\n");
		//接收数据
		bzero(buf,sizeof(buf));
		res=recv(cfd,buf,sizeof(buf),0);
		if(res == -1){
			ERR_MSG("recv");
			return -1;
		}else if(0 == res){
			printf("服务器下线\n");
			break;
		}
		printf("%s\n",buf);

	}

	//关闭文件描述符
	close(cfd);
	return 0;
}

UDP服务器：

#include 

#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__:",__LINE__);\
	perror(msg);\
}while(0)

#define PORT 8888
#define IP "192.168.114.67"
int main(int argc, const char *argv[])
{
	//创建报式套接字 socket
	int sfd=socket(AF_INET,SOCK_DGRAM,0);
	if(sfd == -1){
		ERR_MSG("socket");
		return -1;
	}
	printf("socket success\n");

	struct sockaddr_in sin;
	sin.sin_family 	= 	AF_INET;
	sin.sin_port 	= 	htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);

	//将套接字绑定服务器 bind
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin)) == -1){
		ERR_MSG("bind");
		return -1;
	}
	printf("bind asuccess\n");

	char buf[128]="";
	struct sockaddr_in cin;
	socklen_t addrlen=sizeof(cin);
	while(1){
		bzero(buf,sizeof(buf));
		//接收数据
		if(recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,&addrlen) == -1){
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("收到：%s\n",buf);
		//发送数据
		strcat(buf,"*_*");
		if(sendto(sfd,buf,strlen(buf),0,(struct sockaddr*)&cin,addrlen) == -1){
			ERR_MSG("sendto");
			return -1;
		}
		printf("send success\n");
	}
	//关闭文件描述符
	close(sfd);
	return 0;
}

UDP客户端：

#include 

#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__:",__LINE__);\
	perror(msg);\
}while(0)

#define PORT 8888
#define IP "192.168.114.67"

int main(int argc, const char *argv[])
{
	//创建报式套接字 socket
	int cfd=socket(AF_INET,SOCK_DGRAM,0);
	if(cfd == -1){
		ERR_MSG("socket");
		return -1;
	}
	printf("socket success\n");

	struct sockaddr_in sin;
	sin.sin_family 	= 	AF_INET;
	sin.sin_port 	= 	htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);

	struct sockaddr_in cin;
	socklen_t addrlen=sizeof(cin);
	char buf[128]="";
	while(1){
		bzero(buf,sizeof(buf));
		//发送数据
		printf("请输入：");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]='\0';
		if(sendto(cfd,buf,strlen(buf),0,(struct sockaddr*)&sin,sizeof(sin)) == -1){
			ERR_MSG("sendto");
			return -1;
		}
		printf("send success\n");
		//接收数据
		bzero(buf,sizeof(buf));
		if(recvfrom(cfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,&addrlen) == -1){
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("收到：%s\n",buf);
	}
	//关闭文件描述符
	close(cfd);
	return 0;
}