复习网络客户端/用户

服务端

#include
#include
#include
#include
#include
#include
#include


//宏定义
#define ERR_MSG(msg) do{fprintf(stderr,"line:%d\n",__LINE__);perror(msg);}while(0)
#define PORT  1151
#define IP "192.168.0.117"


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;
	}
	//端口重复使用
	int reuse = 1;
	if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}
	printf("允许重复使用");
	//填充服务器地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;       //填充AF_INET
	sin.sin_port   = htons(PORT);   //端口号的网络字节序
	sin.sin_addr.s_addr = inet_addr(IP); //IP，本机的IP

	//绑定。功能：将服务端的IP地址和端口号绑定到服务器的套接字文件中
	if(bind(sfd,(struct sockaddr *)&sin,sizeof(sin)) < 0)
	{
		ERR_MSG("bind");
		return -1;
	}
	//输出验证
	printf("bind is success __%d__\n",__LINE__);


	//被动监听状态
	if(listen(sfd,128) < 0)
	{
		ERR_MSG("listen");
		return -1;
	}
	//输出验证
	printf("listen is success __%d__\n",__LINE__);


	//存储连接成功的客户端地址
	struct sockaddr_in cin;
	socklen_t addrlen = sizeof(cin);

	//生成一个新的文件描述符
	int newfd = accept(sfd,(struct sockaddr *)&cin,&addrlen);
	if(newfd < 0)
	{
		ERR_MSG("accept");
		return -1;
	}
	//输出验证
	printf("连接成功[%s:%d]newfd = %d __%d__\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,__LINE__);

	char buf[1024] = "";//定义一个数组
	size_t res = 0;
	while(1)
	{
		bzero(buf,sizeof(buf));//清空
		
		//接收
		res = recv(newfd,buf,sizeof(buf),0);
		if(res < 0)
		{
			ERR_MSG("recv");
			return -1;
		}
		else if(res == 0)
		{
			printf("客户端已下线[%s:%d]newfd = %d __%d__\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,__LINE__);
			break;
		}
		printf("连接成功[%s:%d]newfd = %d __%d__\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,__LINE__);
	
		//发送
       strcat(buf,"return word");
	   if(send(newfd,buf,sizeof(buf),0) <0)
	   {
	   		ERR_MSG("send");
			return -1;
	   }
		printf("发送成功\n");
	}


	//关闭
	close(newfd);
	close(sfd);
	return 0;
}

客户端

#include 
#include     
#include 
#include 
#include 
#include 
#include 

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

#define IP "192.168.0.117"
#define PORT 1151

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

	//2.填充服务器地址信息
	struct sockaddr_in sin;
	sin.sin_family     = AF_INET;
	sin.sin_port       = htons(PORT);//端口号的网络字节序1024--49151
	sin.sin_addr.s_addr= inet_addr(IP);//IP 本机IP ifconfig

	//3.非绑定

	if(connect(cfd,(struct sockaddr *)&sin,sizeof(sin)) < 0)
	{
		ERR_MSG("connect");
		return -1;
	}
	printf("连接成功\n");


	char buf[1024] = "";
	size_t res = 0;
	while(1)
	{
		bzero(buf,sizeof(buf));
		printf("Input>>>>");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1] = '\0';

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

		bzero(buf,sizeof(buf));//清零
		//5.接收
		res = recv(cfd,buf,sizeof(buf),0);
		if(res < 0)
		{
			ERR_MSG("recv");
			return -1;
		}
		else if(res == 0)
		{
			printf("服务器下线\n");
			break;
		}
		printf(" : %s__%d__\n",buf,__LINE__);


	}


	//7.关闭文件描述符
	close(cfd);
	return 0;
}

运行结果