2023年8月28日

1. TCP的服务器 客户端的代码

#include 

#define PORT 4396
#define IP "192.168.114.69"
int main(int argc, const char *argv[])
{
	//创建套接字
	int sfd;
	if((sfd=socket(AF_INET,SOCK_STREAM,0))<0)
	{
		ERR_MSG("socket");
		return -1;
	}
	printf("sockte success\n");

	//定义真实地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);

	//绑定服务器的端口和IP
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("bnd");
		return -1;
	}
	printf("bind success\n");


	//将套接字设置为被动监听
	if((listen(sfd,128))<0)
	{
		ERR_MSG("listen");
		return -1;
	}

	int nfd;
	struct sockaddr_in cin;
	socklen_t addrlen=sizeof(cin);
	//获取新的套接字
	if((nfd=accept(sfd,(struct sockaddr*)&cin,&addrlen))<0)
	{
		ERR_MSG("accept");
		return -1;
	}
	printf("[%s:%d]客户端连接成功 nfd=%d\n",\
			inet_ntoa(cin.sin_addr),\
			ntohs(cin.sin_port),\
			nfd);

	char buf[128];
	ssize_t res;
	while(1)
	{
		//清空字符串
		bzero(buf,sizeof(buf));

		//接受
		if((res=recv(nfd,buf,sizeof(buf),0))<0)
		{
			ERR_MSG("recv");
			return -1;
		}else if(res==0)
		{
			printf("[%s:%d]客户端下线 nfd=%d\n",\
			inet_ntoa(cin.sin_addr),\
			ntohs(cin.sin_port),\
			nfd);
			break;
		}
		printf("[%s:%d] nfd=%d : %s\n",\
				inet_ntoa(cin.sin_addr),\
				ntohs(cin.sin_port),\
				nfd,buf);


		//发送
		strcat(buf,"~");
		if((send(nfd,buf,sizeof(buf),0))<0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("send success\n");
	}
	//关闭
	close(nfd);
	return 0;
}

#include 

#define PORT 4396
#define IP "192.168.114.69"

int main(int argc, const char *argv[])
{
	//创建套接字
	int cfd;
	if((cfd=socket(AF_INET,SOCK_STREAM,0))<0)
	{
		ERR_MSG("socket");
		return -1;
	}
	printf("sockte 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
	if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("connect");
		return -1;
	}
	printf("connect success\n");
	
	char buf[128];
	ssize_t res;
	while(1)
	{
		bzero(buf,sizeof(buf));
		printf("请输入\n");
		fgets(buf,sizeof(buf),stdin);
		buf[sizeof(buf)-1]=0;
		//发送
		if(send(cfd,buf,sizeof(buf),0)<0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("send success");

		bzero(buf,sizeof(buf));
		//接受
		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);
	}
	//结束
	close(cfd);
	return 0;
}

2. UDP服务器客户端代码

#include 

#define PORT 2200
#define IP "192.168.114.69"

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

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

	//绑定客户端端口和IP
	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 socklen = sizeof(cin);
	while(1)
	{
		//接受
		bzero(buf,sizeof(buf));
		if(recvfrom(sfd,buf,sizeof(buf),0,\
				(struct sockaddr*)&cin,\
				&socklen)<0)
		{
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("[%s:%d]:%s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);

		//发送
		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
	close(sfd);
	return 0;
}

#include 

#define PORT 2200
#define IP "192.168.114.69"

int main(int argc, const char *argv[])
{
	//创建套接字
	int cfd=socket(AF_INET,SOCK_DGRAM,0);
	if(cfd<0)
	{
		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);

	char buf[128];
	socklen_t socklen=sizeof(sin);

	while(1)
	{
		bzero(buf,sizeof(buf));
		printf("请输入要发送的内容\n");
		fgets(buf,sizeof(buf),stdin);
		buf[sizeof(buf)-1]=0;
		//发送,指定发送的人
		if(sendto(cfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,sizeof(sin))<0)
		{
			ERR_MSG("sendto");
			return -1;
		}
		printf("send success\n");

		//接受
		bzero(buf,sizeof(buf));
		if(recvfrom(cfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,&socklen)<0)
		{
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("cfd=%d:%s\n",cfd,buf);

	}
	//关闭
	close(cfd);
	return 0;
}