TCP\UDP服务器与客户端

作业：
1. 搭建TCP服务器 客户端
2. 搭建UDP服务器 客户端

TCP服务器：

#include <myhead.h>

#define ERR_MSG(msg) do{\
	fprintf(stderr, "line:%d : %s  %s  ",__LINE__,__FILE__,__func__);\
	perror(msg);\
}while(0)

#define IP "192.168.2.85" 		//ifconfig出来的本机IP
#define PORT 6666 				//1024~49151,网络字节序


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

	//允许端口快速被重用
    int reuse = 1;
    if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)
    {
        ERR_MSG("setsockopt");
        return -1;
    }
    printf("允许端口快速重用成功 __%d__\n", __LINE__);
	

	//填充服务器的地址信息结构体，给bind函数绑定
	//真实的地址信息结构体根据地址族制定：AF_INET:man 7 ip
	struct sockaddr_in sin;
	 
	sin.sin_family 		= AF_INET;   	  	    //必须填AF_INET
	sin.sin_port 		= htons(PORT); 	  		//网络字节序
	sin.sin_addr.s_addr = inet_addr(IP); 		//ifconfig出来的本机IP


	//绑定服务器IP和端口
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("bind success __%d__\n",__LINE__);
	
	//将套接字设置为被动监听状态
	if(listen(sfd,128)<0)
	{
		ERR_MSG("listen");
		return -1;
	}
	printf("listen success __%d__\n",__LINE__);

	struct sockaddr_in cin;
	socklen_t addrlen = sizeof(cin);

	//获取连接成功后的新的套接字文件描述符
	int newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
	if (newfd < 0)
	{
		ERR_MSG("accept");
		return -1;
	}
	printf("[%s:%d]客户端连接成功 newfd = %d __%d__\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port), newfd,__LINE__);
	
	char buf[128] = "";
	ssize_t res = 0;
	while(1)
	{
		bzero(buf,sizeof(buf));
		//接受
		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 __%d__\n",\
					inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,__LINE__);
			break;
		}
		printf("newfd = %d: %s\n",newfd,buf);
		//发送
		struct(buf,**);
		if(send(newfd,buf,sizeof(buf),0)<0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("send success __%d__\n",__LINE__);




	}
	
	//关闭套接字文件描述符
	close(newfd);
	close(sfd);


	return 0;
}

TCP客户端：

#include <myhead.h>

#define ERR_MSG(msg) do{\
	fprintf(stderr, "line:%d : %s  %s  ",__LINE__,__FILE__,__func__);\
	perror(msg);\
}while(0)

#define IP "192.168.2.85" 		//ifconfig出来的本机IP
#define PORT 6666 				//1024~49151,网络字节序


int main(int argc, const char *argv[])
{
	//创建流式套接字
	int cfd = socket(AF_INET,SOCK_STREAM,0);
	if(cfd < 0)
	{
		ERR_MSG("socket");
		return -1;
	}
	
	//绑定客户端自身的地址信息结构体
	//若不绑定，则操作系统会自动帮cli绑定IP和端口
	//IP：客户端运行环境的IP地址
	//port：默认从49151~65535范围动态选择

	//填充服务器的地址信息结构体，给connect函数绑定
	//客户端想连接哪个服务器，就填哪个服务器绑定的IP和端口
	struct sockaddr_in sin;
	 
	sin.sin_family 		= AF_INET;   	  	    //必须填AF_INET
	sin.sin_port 		= htons(PORT); 	  		//网络字节序
	sin.sin_addr.s_addr = inet_addr(IP); 		//ifconfig出来的本机IP


	//绑定服务器IP和端口
	if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("connect");
		return -1;
	}
	printf("connect success __%d__\n",__LINE__);
	

	
	char buf[128] = "";
	ssize_t res = 0;
	while(1)
	{
		bzero(buf,sizeof(buf));
		//发送
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1] = 0;
		if(send(cfd,buf,sizeof(buf),0)<0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("send success __%d__\n",__LINE__);

		//接收
		res = recv(cfd,buf,sizeof(buf),0);
		if(res < 0)
		{
			ERR_MSG("recv");
			return -1;
		}
		else if(0 == res)
		{
			printf("服务器下线__%d__\n",__LINE__);
			break;
		}
		printf(":%s __%d__\n",buf,__LINE__);
	}
	
	//关闭套接字文件描述符
	close(cfd);
	return 0;
}

UDP服务器：

#include <myhead.h>

#define ERR_MSG(msg) do{\
	fprintf(stderr, "line:%d : %s  %s\n",__LINE__,__FILE__,__func__);\
	perror(msg);\
}while(0)

#define IP "192.168.2.85" 		//ifconfig出来的本机IP
#define PORT 6666 				//1024~49151,网络字节序


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

	//填充服务器的地址信息结构体
	//真实的地址信息结构体根据地址族制定：AF_INET:man 7 ip
	struct sockaddr_in sin;
	 
	sin.sin_family 		= AF_INET;   	      //必须填AF_INET
	sin.sin_port 		= htons(PORT); 	  //网络字节序
	sin.sin_addr.s_addr = inet_addr(IP); 		//ifconfig出来的本机IP


	//绑定地址信息结构体
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("bind success __%d__\n",__LINE__);

	char buf[128] = "";
	struct sockaddr_in cin; 		//存储数据包是从何而来
	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("send");
			return -1;
		}
		printf("send success __%d__\n",__LINE__);

	}
	
	//关闭套接字文件描述符
	close(sfd);
	return 0;
}

UDP客户端：

#include <myhead.h>

#define IP "192.168.2.85"  //ifconfig出来的本机IP
#define PORT 6666           //1024~49151，网络字节序

#define ERR_MSG(msg) do{\
    fprintf(stderr, "line:%d: %s %s\n", __LINE__, __FILE__, __func__);\
    perror(msg);\
}while(0)

int main(int argc, const char *argv[])
{
	int cfd = socket(AF_INET,SOCK_DGRAM,0);
	if(cfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}

	//刷新端口号
	int reuse=1;
	if(setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}


    struct sockaddr_in sin;
    sin.sin_family      = AF_INET;          //必须填AF_INET;
    sin.sin_port        = htons(PORT);      //1024~49151，网络字节序
    sin.sin_addr.s_addr = inet_addr(IP);    //ifconfig出来的本机IP

/*
    //连接服务器
    if(connect(cfd, (struct sockaddr*)&sin, sizeof(sin)) < 0)
    {
        ERR_MSG("connect");
        return -1;
    }
    printf("connect success __%d__\n", __LINE__);
*/
    char buf[128] = "";
	struct sockaddr_in cin;
	socklen_t addrlen = sizeof(cin);

	while(1)
	{
		bzero(buf,sizeof(buf));

		//发送
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf) -1] = 0;

		if(sendto(cfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,sizeof(sin))<0)
		{
			ERR_MSG("sendto");
			return -1;
		}
		printf("send success __%d__\n",__LINE__);

		bzero(buf,sizeof(buf));

		//接收
		if(recvfrom(cfd,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);

	}

	close(cfd);
	return 0;
}