网络编程day2

TCP服务器和客户端

#include 
#define ERR_MSG(msg) 	do{\
	fprintf(stderr,"__%d__:",__LINE__);\
	perror(msg);\
}while(0)
#define PORT 8888
#define IP "192.168.114.12"


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<0){
		ERR_MSG("socket");
		return -1;
	}
	printf("socket create success sfd=%d\n",sfd);

	//允许端口快速被复用
	int reuse=1;
	if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)
    {
        ERR_MSG("setsockopt");
        return -1;
    }
    printf("允许端口快速的被复用成功\n");

	//填充地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family =AF_INET;
	sin.sin_port   =htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	
	
	//绑定服务器的地址信息-->必须绑定 bind
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0){
		ERR_MSG("bind");
		return -1;
	}
	printf("bind success\n");

	//将套接字设置为被动监听状态 listen
	if(listen(sfd,128)<0){
		ERR_MSG("listen");
		return -1;
	}
	printf("listen success\n");
	//获取一个客户端信息，生产一个新的文件描述符 accept
	int newfd=-1;
	struct sockaddr_in cin;
	socklen_t addrlen=sizeof(cin);
	newfd=accept(sfd,(struct sockaddr*)&cin,&addrlen);
	if(newfd<0){
		ERR_MSG("newfd");
		return -1;
	}
	printf("[%s:%d]客户端连接成功 newfd=%d\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
	char buf[128]="";
	ssize_t res=0;
	while(1){
		//清空字符串
		bzero(buf,sizeof(buf));

		//接收
		res=recv(newfd,buf,sizeof(buf),0);
		if(res<0){
			ERR_MSG("recv");
			return -1;
		}else if(0==res){
			printf("[%s:%d]客户端下线 newfd=%d\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
			break;
		}
		printf("[%s:%d]客户端连接成功 newfd=%d : %s\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,buf);
		//发送
		strcat(buf,">_<");
		if(send(newfd,buf,sizeof(buf),0)<0){
			ERR_MSG("send");
			return -1;
		}
		printf("send success\n");
	}
	//关闭文件名描述符
	close(newfd);
	if(close(sfd)<0){
		ERR_MSG("close");
		return -1;
	}
	return 0;
}

#include 
#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__:",__LINE__);\
	perror(msg);\
}while(0)
#define PORT 8888
#define IP "192.168.114.12"


int main(int argc, const char *argv[])
{
	//创建流式套接字 socket
	int cfd=socket(AF_INET,SOCK_STREAM,0);
	if(cfd<0){
		ERR_MSG("socket");
		return -1;
	}
	printf("socket create success cfd=%d\n",cfd);
	
	//绑定客户端地址信息---->非必须绑定
	//填充服务器的地址信息结构体给connect函数连接
	struct sockaddr_in sin;
	sin.sin_family 		=AF_INET;
	sin.sin_port 		=htons(PORT);
	sin.sin_addr.s_addr =inet_addr(IP);

	//连接指定服务器
	if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin))<0){
		ERR_MSG("connect");
		return -1;
	}
	printf("connect success\n");

	char buf[128]="";
	ssize_t res=0;
	while(1){
		bzero(buf,sizeof(buf));
		printf("请输入：");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;

		//发送
		if(send(cfd,buf,sizeof(buf),0)<0){
			ERR_MSG("send");
			return -1;
		}
		printf("send success\n");

		bzero(buf,sizeof(buf));
		//接收
		if((res=recv(cfd,buf,sizeof(buf),0))<0){
			ERR_MSG("recv");
			return -1;
		}else if(res==0){
			printf("服务器下线 cfd=%d\n",cfd);
			break;
		}
		printf("cfd=%d : %s\n",cfd,buf);

	}
	//关闭文件名描述符
	if(close(cfd)<0){
		ERR_MSG("close");
		return -1;
	}
	return 0;
}

UDP服务器和客户端

#include 
#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__:",__LINE__);\
	perror(msg);\
}while(0)
#define PORT 8888
#define IP "192.168.114.12"

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<0){
		ERR_MSG("socket");
		return -1;
	}
	printf("socket create success sfd=%d\n",sfd);

	//填充服务器的地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family 		=AF_INET;
	sin.sin_port 		=htons(PORT);
	sin.sin_addr.s_addr =inet_addr(IP);
	
	//绑定地址信息结构体 bind
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0){
		ERR_MSG("bind");
		return -1;
	}
	printf("bind success\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)<0){
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("[%s:%d] : %s\n",\
				inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);
		//发送数据
		strcat(buf,">_<");
		if(sendto(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,sizeof(cin))<0){
			ERR_MSG("sendto");
			return -1;
		}
		printf("sendto success\n");
		
	}
	//关闭套接字
	close(sfd);
	return 0;
}

#include 
#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__:",__LINE__);\
	perror(msg);\
}while(0)
#define PORT 8888
#define IP "192.168.114.12"

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<0){
		ERR_MSG("socket");
		return -1;
	}
	printf("socket create success cfd=%d\n",cfd);

	//填充服务器的地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family 		=AF_INET;
	sin.sin_port 		=htons(PORT);
	sin.sin_addr.s_addr =inet_addr(IP);
	
	//绑定地址信息结构体 bind 非必须绑定
	
	char buf[128]="";
	ssize_t res=0;
	struct sockaddr_in rcv;
	socklen_t addrlen=sizeof(rcv);
	while(1){
		bzero(buf,sizeof(buf));
		printf("请输入：");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
		//发送数据
		if((sendto(cfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,sizeof(sin)))<0){
			ERR_MSG("sendto");
			return -1;
		}
		printf("sendto success\n");
		bzero(buf,sizeof(buf));
		//接收数据
		if((res=recvfrom(cfd,buf,sizeof(buf),0,(struct sockaddr*)&rcv,&addrlen))<0){
			ERR_MSG("recvfrom");
			return -1;
		}else if(res==0){
			printf("服务器下线 cfd=%d\n",cfd);
			break;
		}
		printf("cfd=%d : %s\n",cfd,buf);
		
	}
	//关闭套接字
	close(cfd);
	return 0;
}