两个客户端通过服务器通信（互发）

素颜马尾好姑娘i 2022-07-13 09:55 160阅读 0赞

创建两个客户端A,B，一个服务器。

要求：  
客户端A,B都能传小写字母给服务器，服务器接收后转换成大写字母

回传给对方客户端（A写的返回给B，B写的返回给A）。

效果：客户端A处输入一个字母，客户端B输出一个大写字母。客户端B  
处输入一个字母，客户端A输出一个大写字母（可以添加说明printf（）输入为 / 转换后输出为）

客户端A和B是同一个执行文件

/*********************************************************************
    File Name:               tcp_net_socket.h
    Author:                         date:
    Description:            
    Fuction List:			
    ********************************************************************/
    
    #ifndef _TCP_NET_SOCKET_H
    #define _TCP_NET_SOCKET_H
    
    #include <stdio.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <string.h>
    #include <stdlib.h>
    #include <netinet/in.h>
    #include <arpa/inet.h>
    #include <unistd.h>
    #include <signal.h>
    #include <pthread.h>
    #include <semaphore.h>
    
    #define SERV_PORT 9000
    
    extern int tcp_init();
    extern int tcp_accept(int sfd);
    extern int tcp_connet();
    extern void signalhandler(void);
    
    #endif

/*********************************************************************
    File Name:               tcp_net_socket.c
    Author:                          date:
    Description:            
    Fuction List:			int tcp_init() 							//用于初始化操作
    						int tcp_accept(int sfd)					//用于服务器的接收
    						int tcp_connect(const char* ip)			//用于客户端的连接
    						void signalhandler(void)				//用于信号处理，让服务器在按下Ctrl+c或Ctrl+\时不会退出
    ********************************************************************/
    
    #include "tcp_net_socket.h"
    
    //用于初始化操作
    int tcp_init()  
    {
    	int sfd = socket(AF_INET, SOCK_STREAM, 0);     //创建套接字
    	if(sfd == -1)
    	{
    		perror("socket");
    		return -1;
    	}
    	
    	int ret;
    	struct sockaddr_in serveraddr;
    
    	memset(&serveraddr,0,sizeof(struct sockaddr));	
    	serveraddr.sin_family = AF_INET;
    	serveraddr.sin_port = htons(SERV_PORT);
    	serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
    	
    	ret = bind(sfd, (struct sockaddr*)&serveraddr, sizeof(struct sockaddr));
    	if(ret == -1)
    	{
    		perror("bind");
    		return -1;
    	}
    	
    	ret = listen(sfd,10);           //监听它，并设置允许最大的连接数为10个
    	if(ret == -1)
    	{
    		perror("listen");
    		close(sfd);
    		return -1;
    	}
    	
    	return sfd;
    }
    
    //用于服务器的接收
    int tcp_accept(int sfd)
    {
    	struct sockaddr_in clientaddr;
    	memset(&clientaddr, 0, sizeof(struct sockaddr));
    	int addrlen = sizeof(struct sockaddr);
    	
    	//sfd接受客户端的连接，并创建新的socket为new_fd，将请求连接的客户端的ip、port保存在结构体clientaddr中
    	int new_fd = accept(sfd, (struct sockaddr*)&clientaddr, &addrlen);       
    	if(new_fd == -1)
    	{
    		perror("accept");
    		close(sfd);
    		return -1;
    	}
    	printf("%s %d success connet...\n", 
    	inet_ntoa(clientaddr.sin_addr),ntohs(clientaddr.sin_port));
    	
    	return new_fd;
    }
    
    //用于客户端的连接
    int tcp_connect(const char* ip)
    {
    	int ret;
    	int sfd = socket(AF_INET, SOCK_STREAM, 0);     //申请新的socket
    	if(sfd == -1)
    	{
    		perror("socket");
    		return -1;
    	}
    	
    	struct sockaddr_in serveraddr;
    	
    	memset(&serveraddr, 0,sizeof(struct sockaddr));
    	serveraddr.sin_family = AF_INET;
    	serveraddr.sin_port = htons(SERV_PORT);
    	serveraddr.sin_addr.s_addr = inet_addr(ip);    
    	
    	ret = connect(sfd, (struct sockaddr*)&serveraddr, sizeof(struct sockaddr));       //将sfd连接至指定的服务器网络地址 serveraddr
    	if(ret == -1)
    	{
    		perror("connect");
    		close(sfd);
    		return -1;
    	}
    	
    	return sfd;
    }
    
    //用于信号处理，让服务器在按下Ctrl+c或Ctrl+\时不会退出
    void signalhandler(void)
    {
    	sigset_t sigSet;
    	sigemptyset(&sigSet);
    	sigaddset(&sigSet,SIGINT);
    	sigaddset(&sigSet,SIGQUIT);
    	sigprocmask(SIG_BLOCK,&sigSet,NULL);
    }

/*********************************************************************
    File Name:               tcp_net_server.c
    Author:                         date:
    Description:            
    Fuction List:			
    ********************************************************************/
    #include "tcp_net_socket.h"
    
    char buf1;
    char buf2;
    sem_t MSG1;
    sem_t MSG2;
    
    void *client1(void* fd)
    {
    	int cfd = *((int *)fd);
    	int ret;
    	while(1)
    	{
    		sem_wait(&MSG1);
    		
    		ret = read(cfd, &buf1, sizeof(char));
    		if(ret == -1)
    		{
    			perror("read");
    			close(cfd);
    			return ;
    		}
    		printf("read buf1 success!\n");
    		
    		buf1 = buf1 - 'a' + 'A';
    		
    		ret = write(cfd, &buf2, sizeof(char));
    		if(ret == -1)
    		{
    			perror("write");
    			close(cfd);
    			return;
    		}
    		printf("write buf2 success!\n");
    		memset(&buf2,0,sizeof(char));
    		
    		sem_post(&MSG2);
    	 } 
    	 close(cfd);
    }
    
    void *client2(void* fd)
    {
    	int cfd = *((int *)fd);
    	int ret;
    	while(1)
    	{
    		sem_wait(&MSG2);
    		
    		ret = write(cfd, &buf1, sizeof(char));
    		if(ret == -1)
    		{
    			perror("write");
    			close(cfd);
    			return;
    		}
    		printf("write buf1 success!\n");
    		
    		ret = read(cfd, &buf2, sizeof(char));
    		if(ret == -1)
    		{
    			perror("read");
    			close(cfd);
    			return ;
    		}
    		printf("read buf2 success!\n");
    		
    		buf2 = buf2 - 'a' + 'A';
    		memset(&buf1,0,sizeof(char));
    		
    		sem_post(&MSG1);
    	}
    	close(cfd);
    }
    
    int main()
    {
    	signalhandler();
    	
    	int sfd = tcp_init();
    	int ret;
    	int cfd[2];
    	pthread_t client1ID;
    	pthread_t client2ID;
    	int i = 0;
    	
    	sem_init(&MSG1, 0, 1);
    	sem_init(&MSG2, 0, 0);
    	
    	while(1)
    	{
    		printf ("waiting for client to connect.....\n");
    		
    		cfd[i] = tcp_accept(sfd);
    		if(cfd[i] == -1)
    		{
    			return -1;
    		}
    		
    		if(i == 0)
    		{
    			pthread_create(&client1ID, NULL, client1, (void*)&cfd[i]);
    		}
    		
    		if(i == 1)
    		{
    			pthread_create(&client2ID, NULL, client2, (void*)&cfd[i]);
    		}
    		
    		i++;
    	}
    	
    	close(sfd);
    	
    	return 0;
    }

/*********************************************************************
    File Name:               tcp_net_client2.c
    Author:                  xxx        date:
    Description:            
    Fuction List:			
    ********************************************************************/
    #include "tcp_net_socket.h"
    
    char buf[2] = {0};
    sem_t MSG1;
    sem_t MSG2;
    
    void* Write(void* fd)
    {
    	int sfd = *((int*)fd);
    	int ret;
    	
    	while(1)
    	{
    		sem_wait(&MSG1);
    		
    		memset(&buf,0,sizeof(buf));
    		
    		printf("请输入小写字母：");
    		scanf("%s",&buf);
    		
    		ret = write(sfd, &buf[0], 1);
    		if(ret == -1)
    		{
    			perror("write");
    			close(sfd);
    			return;
    		}
    		
    		sem_post(&MSG2);
    	}
    	close(sfd);
    }
    
    void* Read(void* fd)
    {
    	int sfd = *((int*)fd);
    	int ret;
    	
    	while(1)
    	{
    		sem_wait(&MSG2);
    		
    		ret = read(sfd, &buf[0], sizeof(char));
    		if(ret == -1)
    		{
    			perror("read");
    			close(sfd);
    			return;
    		}
    		
    		printf("转换后的大写字母为：");
    		printf("%c\n",buf[0]);
    		
    		sem_post(&MSG1);
    	}
    	close(sfd);
    }
    
    int main(int argc, char** argv)
    {
    	if(argc != 2)
    	{
    		printf("Usage:./client ip\n");
    		return -1;
    	}
    	
    	pthread_t readID;
    	pthread_t writeID;
    	int ret;
    	int sfd = tcp_connect(argv[1]);
    	
    	sem_init(&MSG1, 0, 1);
    	sem_init(&MSG2, 0, 0);
    	
    	while(1)
    	{
    		ret = pthread_create(&readID, NULL, Read, (void*)&sfd);
    		if(ret == -1)
    		{
    			perror("pthread_create readID");
    			return -1;
    		}
    		
    		ret = pthread_create(&writeID, NULL, Write, (void*)&sfd);
    		if(ret == -1)
    		{
    			perror("pthread_create writeID");
    			return -1;
    		}
    	}
    	
    	
    	return 0;
    }